Abstract:
A lifting device includes: at least one first magnetic body, which is positioned on a platform and driven by a driving unit so as to move along a predetermined track; at least one second magnetic body, which is positioned above a part of track of the first magnetic body by a supporting device, and the magnetism of which is repulsive to that of the first magnetic body; and a lifting mechanism, which is fixedly connected to the second magnetic body, the second magnetic body is lifted or lowered according to the first magnetic body passing through or leaving from the second magnetic body during its movement course so as to cause the lifting mechanism to be lifted, lowered or swung. The lifting device can lift heavy objects by magnetic energy existing in the nature and has a simple structure, broad applicability, energy saving and high enviromental protectionability. A power generation device and a sea reverse osmosis device that have the lifting device are disclosed.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    This invention relates to a lifting device, as well as a power generation device with the lifting device and sea reverse osmosis device that has the lifting device. 
         [0003]    2. Description of the Relevant Art 
         [0004]    For the world&#39;s large population, energy is a basic issue of the survival and development. It is inseparable from energy to improve living standards and develop economy. However, energy crisis has been a problem for countries of the world all the time. Power shortage is an issue that all previous governments of each country must face. Due to improvement of production and living standards, power shortage in China has been more obvious day by day, especially during the peak period of power usage. In order to ease the power shortage situation, the government has to take measures to set up restrictions on power usage. The implementation of this measure will greatly hamper consumption which is not conducive to Chinese economic growth. Therefore, countries around the world including China have been striving to improve the power supply capacity. 
         [0005]    The main way of current power generation is thermal power generation which consumes a great deal of one-off energy and pollutes the environment heavily. Presently, countries are all working on environmental power generation technology research by utilizing natural energy, wherein, the hydroelectric power generation technology has been relatively mature and used widely, and the researches on power generation technology by using wind power, solar power and sea liquid are still under study. However, none of those researches pays sufficient attention on magnetic energy, another exiting natural energy. 
         [0006]    At present, implementing reverse osmosis treatment on seawater by reverse osmosis membrane is an important technology which takes full advantage of ocean resources to obtain freshwater resources. However, the exiting sea reverse osmosis devices have the disadvantages of high cost, long construction cycle, maintenance difficult and low rate of converting seawater into freshwater. In addition, this kind of seawater desalinization technology requires consumption of a large amount of exiting energy resources and high costs. No high-efficiency sea osmosis technology mainly utilizing natural energy has been developed yet. 
       SUMMARY OF THE INVENTION 
       [0007]    In view of problems mentioned above, one of the objects is to provide a lifting device utilizing magnetic force to lift objects; the said lifting device can lift objects and change gravitational potential energy of the objects by using magnetic energy between magnets. 
         [0008]    Another object is to provide a power generation device which can transfer the objects&#39; gravitational potential energy changed by magnetic energy between magnets into electric energy. 
         [0009]    Still another object is to provide a sea reverse osmosis device which can utilize magnetic energy between magnets to change gravitational potential energy of objects so that sea reverse osmosis treatment can be conducted by utilizing the changed gravitational potential energy. 
         [0010]    The lifting device includes: at least one first magnetic body, the said first magnetic body is positioned on a platform and driven by a driving unit so as to move along a predetermined track; at least one second magnetic body, the said second magnetic body is positioned above part of track of the said first magnetic body, and the magnetism of which is repulsive to that of the first magnetic body; a lifting mechanism, the said lifting mechanism is positioned on a supporting device and connected to the second magnetic body; wherein, the second magnetic body is lifted or lowered vertically in cycle according to the first magnetic body&#39;s passing through or leaving from the second magnetic body at a set speed in cycle, so as to cause the lifting mechanism to be lifted, lowered or swung. 
         [0011]    According to the lifting device, wherein, the said platform is a rotation platform which can rotate around an axis; the said driving unit is connected to the rotation platform to drive the platform to rotate; the said first magnetic body is fixed on the rotation platform and rotates according to the rotation thereof. 
         [0012]    According to the lifting device, wherein, the said platform is a supporting platform which is fixedly positioned, the said driving unit is connected to the said first magnetic body to drive the said first magnetic body to move on the said supporting platform. 
         [0013]    According to the lifting device, wherein, the said lifting mechanism is a member bar group, the said member bar group includes a cross rod and a vertical rod which is positioned vertically under the cross rod; the said support bracket is set up with a hole on its top part, the said hole has a diameter slightly larger than that of the said vertical rod and smaller than the length of the said cross rod, in order to enable the said vertical rod to penetrate the said hole for upward and downward movements; the said cross rod is setup with buffer springs under both ends for buffering the impact on the said support bracket by the said cross rod when the member bar group falls down caused by gravity. 
         [0014]    According to the lifting device, wherein, the said lifting mechanism is pulley block, the said pulley block includes a plurality of fixed pulleys and toothed rope-buckle cable which rounds the said fixed pulleys, and the said toothed rope-buckle cable has one end fixing the second magnetic body and another end connected with a lifting stand. 
         [0015]    According to the lifting device, wherein, the said lifting mechanism is a hydraulic lifting mechanism, the said hydraulic lifting mechanism includes liquid reservoir, hydraulic cylinder, piston and extension sleeve which are positioned inside the said hydraulic cylinder, as well as drainage pipelines and one-way valve which connect the said liquid reservoir, hydraulic cylinder and extension sleeve; a lifting stand is fixed on the upper top part of the extension sleeve; wherein, the said second magnetic is connected with the said piston. 
         [0016]    According to the lifting device, wherein, the said lifting mechanism includes at least a set of oscillating piece with magnetic pivot and a bearing support with magnetic support which has the shape and position corresponding to the said magnetic pivot; the magnetism of the said magnetic pivot is set repulsive to that of the said magnetic support, in order to ensure that the said oscillating piece suspends above the said bearing support; wherein, the said second magnetic body is positioned below an end of the said oscillating piece. 
         [0017]    According to the lifting device, wherein, the said oscillating piece includes a lever and a stabilizing bracket which is fixed on the said lever. 
         [0018]    According to the lifting device, wherein, the said oscillating piece includes a disc-type stabilizing bracket and annular pipe fittings positioned at the outer edge of the disc-type stabilizing bracket. 
         [0019]    The power generation device includes: a lifting device as mentioned above, a lifting channel which is positioned around the track of the said second magnetic body; a metal coil for power generation positioned in pipe wall of the said movement pipeline; a power transmission device connected with the said metal coil to transport the generated power outside. 
         [0020]    The power generation device includes: a lifting device as mentioned above; a generator fixed at the upper part of the support bracket, the rotor of the said generator which is connected to the said lifting mechanism and is driven by the said lifting mechanism to rotate to produce power; a power output device connected with the metal coil of the said generator to transport the generated power outside. 
         [0021]    The power generation device includes: a lifting device as mentioned above, wherein, pipe fittings are fixedly positioned in the said oscillating piece, the said pipe fitting swing along with the said oscillating piece, the movement body installed in the said pipe fittings moves back and forth therein by the function of its gravity; a magnet or metal coil is installed on pipe wall of the said pipe fittings, a metal coil or magnet is installed in the said movement body, correspondingly. 
         [0022]    The power generation device includes: a lifting device as mentioned above, a lifting channel including a upstream channel and a downlink channel, in which the said lifting stand is lifted and lowered in the said upstream channel, the said downlink channel has an upper opening leading to the upper opening of the said upstream channel and a lower opening leading to the lower opening of the said upstream channel; a movement body for power generation which moves circularly in the lifting channel formed by the said upstream channel and downlink channel; a metal coil or magnet is installed in the said movement body, while a magnet or metal coil is installed in the said downlink channel, correspondingly; a power output device is connected with the said metal coil to transport the generated power outside. 
         [0023]    The power generation device further includes: a member bar group connected with the second magnet body, the vertical rod of the member bar group is connected with the rotor of the generator. 
         [0024]    The power generation device includes: a lifting device as mentioned above, wherein, the said lifting mechanism is a large piston with a lifting rod fixedly positioned below the large piston; a lifting channel installed at the center of the rotation platform; the lower end of the said lifting rod is deeply inserted into the said lifting channel; a movement body fixedly positioned at the lower end of the said lifting rod does up and down movements in the said lifting channel along with the said lifting rod; a hydraulic buffer device including a water tank, a water tank piston, a bumper bracket fixed on the water tank piston and a buffer board fixed on the top of the bumper bracket which penetrates into the lifting channel, the discharge pipeline connected the water tank and outside environment. 
         [0025]    The seawater reverse osmosis device which is installed in the seawater includes: a lifting device as mentioned above; wherein, the said lifting mechanism is a large disk-shaped piston with a lifting rod fixedly positioned below the piston; a large piston, the said second magnet body is fixedly positioned at the lower part of the said large seawater piston; a osmosis chamber, which is set up with a piston therein which is fixedly connected to the said large piston; a seawater delivery pipeline whose one end connects to the osmosis chamber and another end leads to the seawater; a freshwater reservoir; in which the reverse osmosis membrane is installed between the said osmosis chamber and the said freshwater reservoir and connects to a freshwater collecting device through a freshwater discharge pipeline; a condensed water reservoir; which connects to the lower part of the osmosis chamber through a condensed water delivery pipeline, and connects to a condensed water collecting device through a condensed water discharge pipeline. 
         [0026]    The lifting device vertically lifts and lowers objects continually in cycle by mainly utilizing the interaction between magnetic energy and gravitation potential energy; the said device takes full advantages of natural energy which is energy-saving and environmental. Its size can be either large or small. It&#39;s economic, functional, and widely useful. 
         [0027]    The power generation device mainly utilizes the lifting device mentioned above to drive the object to move for generating power. The said device has the advantages of low investment, short construction cycle, wide application scope and high generating efficiency. In addition, the power generation device can be formed into small size which can produce power during movement; therefore, it can be ideal energy source for various vehicles. 
         [0028]    The sea reverse osmosis device mainly utilizes the lifting device mentioned above to lift heavy objects, and then the gravitation potential energy of the object can be used as energy resource of sea reverse osmosis treatment. The device has the advantages of simple structure, easy maintainability and low cost. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0029]      FIG. 1  is a longitudinal section view schematic diagram of the power generation device according to a first embodiment; 
           [0030]      FIG. 2  is a longitudinal section view schematic diagram of the power generation device according to a second embodiment; 
           [0031]      FIG. 3   a  is a longitudinal section view schematic diagram of the power generation device according to a third embodiment; 
           [0032]      FIG. 3   b  is a top view schematic diagram of the power generation device according to a third embodiment; 
           [0033]      FIG. 4   a  is a longitudinal section view schematic diagram of the power generation device according to a fourth embodiment; 
           [0034]      FIG. 4   b  is a top view schematic diagram of the power generation device shown in  FIG. 4   a;    
           [0035]      FIG. 5   a  is a longitudinal section view schematic diagram of the power generation device according to a fifth embodiment; 
           [0036]      FIG. 5   b  is a top view schematic diagram of the power generation device shown in  FIG. 5   a;    
           [0037]      FIG. 5   c  and  FIG. 5   d  present the other two forms of layout of the first magnet body in the power generation device shown in  FIG. 5   b;    
           [0038]      FIG. 6   a  is a longitudinal section view schematic diagram of the power generation device according to a sixth embodiment; 
           [0039]      FIG. 6   b  is a top view schematic diagram of the power generation device according to the sixth embodiment as shown in  FIG. 6   a  with its oscillating piece removed; 
           [0040]      FIG. 6   c  is a section view schematic diagram of the power generation according to the sixth embodiment along A-A directional line shown in  FIG. 6   a;    
           [0041]      FIG. 6   d  is a section view schematic diagram of the oscillating piece of the power generation device according to the sixth embodiment along B-B directional line shown in  FIG. 6   a;    
           [0042]      FIG. 7   a  to  FIG. 7   f  present several forms of layout of the magnet and metal coil of the power generation device according to the sixth embodiment shown in  FIG. 6   a;    
           [0043]      FIG. 8   a  is a longitudinal section view schematic diagram of the power generation device according to a seventh embodiment; 
           [0044]      FIG. 8   b  is a top view schematic diagram of the power generation device shown in  FIG. 8   a;    
           [0045]      FIG. 8   c  to  FIG. 8   d  present several forms of layout of the lifting channel of the power generation device shown in  FIG. 8   a;    
           [0046]      FIG. 9   a  to  FIG. 9   e  present several forms of layout of the magnet and metal coil which are used for power generation of the power generation device shown in  FIG. 8   a;    
           [0047]      FIG. 10   a  to  FIG. 10   i  present several forms of the movement body of the power generation device shown in  FIG. 8   a;    
           [0048]      FIG. 11  is a longitudinal section view schematic diagram of the power generation device according to an eighth embodiment; 
           [0049]      FIG. 12   a  is a longitudinal section view schematic diagram of the power generation device according to a ninth embodiment; 
           [0050]      FIG. 12   b  is A-A directional section view schematic diagram of the power generation device in  FIG. 12   a;    
           [0051]      FIG. 12   c  is B-B directional section view schematic diagram of the power generation device in  FIG. 12   a;    
           [0052]      FIG. 13  is a longitudinal section view schematic diagram of the power generation device according to a tenth embodiment; 
           [0053]      FIG. 14  is a longitudinal section view schematic diagram of the power generation device according to an eleventh embodiment; 
           [0054]      FIG. 15  is a longitudinal section view schematic diagram of the power generation device according to a twelfth embodiment; 
           [0055]      FIG. 16   a  to  FIG. 16   j  present several forms of layout of the first magnet body of the power generation device according to the twelfth embodiment; 
           [0056]      FIG. 17   a  is a longitudinal section view schematic diagram of the power generation device according to a thirteenth embodiment; 
           [0057]      FIG. 17   b  is a longitudinal section view schematic diagram of the power generation device in  FIG. 17   a  along another direction; 
           [0058]      FIG. 17   c  is a longitudinal section view schematic diagram of the power generation device in  FIG. 17   a  whose large piston stays at the lowest position; 
           [0059]      FIG. 18  is a longitudinal section view schematic diagram of the power generation device according to a fourteenth embodiment; 
           [0060]      FIG. 19   a  is a longitudinal section view schematic diagram of the power generation device according to a fifteenth embodiment; 
           [0061]      FIG. 19   b  is a longitudinal section view schematic diagram of the power generation device in  FIG. 19   a  along another direction; 
           [0062]      FIG. 19   c  is a longitudinal section view schematic diagram of the power generation device in  FIG. 19   a  whose large piston stays at the lowest position; 
           [0063]      FIG. 20   a  is a longitudinal section view schematic diagram of the sea reverse osmosis device according to a sixteenth embodiment; 
           [0064]      FIG. 20   b  is the top view schematic diagram of the sea reverse osmosis device shown in  FIG. 20   a;    
           [0065]      FIG. 20   c  presents one design of the support platform of the sea reverse osmosis device in  FIG. 20   a  which can prevent from accumulation of stagnant water; 
           [0066]      FIG. 20   d  presents another design of the support platform of the sea reverse osmosis device in  FIG. 20   a  which can prevent from accumulation of stagnant water; 
           [0067]      FIG. 21  is a longitudinal section view schematic diagram of the power generation device according to a seventeenth embodiment; 
           [0068]      FIG. 22  is a longitudinal section view schematic diagram of the power generation device according to an eighteenth embodiment; 
           [0069]      FIG. 23  is a longitudinal section view schematic diagram of the power generation device according to a nineteenth embodiment. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0070]    The preferred embodiments will be described in detail in conjunction with figures. 
         [0071]    As shown in  FIG. 1 , the power generation device of example 1 includes lifting device and power-generating unit. 
         [0072]    Wherein, the lifting device includes: drive motor  1 , stationary axis  2  and rotation platform  3 . The stationary axis  2  fixed on the ground surface includes: base  21  installed underground, shaft  22  fixed on the base  21 , and support platform  23  fixed on the top of the shaft  22 . A disc-type rotation platform  3  installed around the stationary axis  2  and connected with the drive motor  1  can rotate, driven by the drive motor  1 , around the stationary axis  2 ; there are roll balls  24  installed between the rotation platform  3  and the stationary axis  2  so as to reduce pivoting friction of the rotation platform  3 . 
         [0073]    The lifting mechanism further includes: support bracket  4 , first magnet body  5 , second magnet body  6  and pulley block  7 . The support bracket  4  is fixed on the ground floor as well as the stationary axis  2 . The first magnet body  5  includes three magnets having the same shape which are fixed on an identical circumference on the upper plane of the rotation platform  3  at equal interval. The pulley block  7  for stabilizing the first magnet body  5  includes a fixed pulley installed on the stationary axis  2  and two fixed pulleys installed on the top of the support bracket  4  symmetrically about the axes of the stationary axis  2 , and rope  8  rounds the pulley block  7 . The second magnet body  6  includes two identical magnets which are connected to both ends of the rope  8  of the pulley block  7  and installed symmetrically about the axes of the stationary axis  2 . The magnetism of the second magnet body  6  is repulsive to that of the first magnet body  5  and hanging above it at a set distance away from which. 
         [0074]    The lifting device further includes lifting channel  9  installed around the second magnet body  6  and fixed by the support bracket  4 . The second magnet body  6  contacts with the lifting channel  9  through the roller wheel  61 . 
         [0075]    The power-generating unit includes metal coil  10  and magnet  11 . Wherein, the metal coil  10  is installed in the magnet body  6 , the magnet  11  for power generation is installed in the pipe wall of the lifting channel  9 . 
         [0076]    The said power-generating unit further includes cable  12  connected to the metal coil  10  which transports generated power outside, including the public grid. 
         [0077]    The working process of the power generation device of the said example is described as follows. 
         [0078]    At initial position, the two second magnet bodies  6  are placed at the identical horizontal plane. The drive motor  1  is started up to rotate the rotation platform  3 , in turn drives the first magnet body  5  fixed on the rotation platform  3  to rotate. When the rotating first magnet  5  cuts in the position below the second magnet body  6  which is suspending above it, the repulsive force between them brings the second magnet body up; as the first magnet body  5  is not arranged correspondingly to the second magnet body  6  respectively, at this point, there is no first magnet body  5  below the second magnet body  6  at the other end of rope  8 , that is to say, there is no repulsive force from the first magnet body  5 , which brings the second magnet body  6  at the other end of rope  8  down. At this point, metal coil installed on the second magnet body  6  moves relative to magnet installed on pipe wall of the lifting channel  9  to produce power by the electromagnetic action between stator and rotor. The generated power is transported to public grid through cable  12 . The first magnet body  5  also can be configured as six natural magnets which are installed on an identical circumference at equal interval. 
         [0079]    As shown in  FIG. 2 , the power generation device of example 2 has basically same structure as that in example 1. The difference is only in that: 
         [0080]    The first magnet body  5  includes four magnets having the same shape which are fixedly positioned on the outer circumference of the rotation platform  3  at equal interval. 
         [0081]    The pulley block  7  in example 1 is replaced by the member bar group  13  which stabilizes the second magnet body and goes up and down with the second magnet body  6 . There are two member bar groups  13  arranged symmetrically about the axes of the stationary axis  2 , each of which includes a cross rod  131  and a vertical rod  132  which is positioned vertically below the cross rod. Correspondingly, the support bracket  4  is installed with hole  41  on its top part, the said hole  41  has a diameter slightly larger than that of the vertical rod  132  and smaller than the length of the cross rod  131 . The vertical rod  132  can penetrate through the hole  41  for upward and downward movements. The cross rod  131  is installed with buffer springs under its both ends for buffering the impact on the said support bracket  4  by the said cross rod  131  when the member bar group  13  falls down by gravity. 
         [0082]    The second magnet body  6  includes two identical magnets fixed at the lower part of two fixing brackets  13 . The said second magnet body  6  has the magnetism repulsive to that of the first magnet body  5  and hanging above it at a set distance away from which. 
         [0083]    The working process of the power generation device of the said example is as follows. 
         [0084]    At initial position, the two second magnet bodies  6  are placed at the identical horizontal plane. The drive motor  1  is started up to rotate the rotation platform  3 , in turn drives the first magnet body  5  which is fixed on the rotation platform  3  to rotate. When the rotating first magnet  5  cuts in the position below the second magnet body  6  which is suspending above it, the repulsive force between the two magnets brings a magnet of the second magnet body  6  up; as the first magnet body  5  and the second magnet body  6  are arranged symmetrically, and at this point, another rotating magnet of the first magnet body  5  also cuts in the position below the second magnet body  6 , the repulsive force between the two magnets brings another magnet of the second magnet body  6  up simultaneously relative to the first magnet body  5 . At this point, metal coil installed on the second magnet body  6  moves relative to magnet installed on the pipe wall of the lifting channel  9  and hence produces power during the upward and downward movements due to the electromagnetic action between stator and rotor. The generated power is transported to outside through cable  12 . 
         [0085]    As shown in  FIGS. 3   a  and  3   b , the power generation device according to example 3 is basically same as that in example 2. The difference is only in that: 
         [0086]    The power-generating unit in the said example is not metal coil and magnet which are installed on the shift device directly but four generators  14  installed on the support bracket  4 . The rotor of generator  14  is connected to the member bar group  13 ′ whose another end is fixed with the second magnet  6 . 
         [0087]    The first magnet body  5  includes three natural magnets which are arranged on an identical circumference at equal interval. 
         [0088]    The working process of the power generation device of the said example is similar with that of example 2. 
         [0089]    At initial position, four second magnet bodies  6  are placed at the identical horizontal plane. The drive motor  1  is started up to rotate the rotation platform  3 , in turn drives the first magnet body  5  which is fixed on the rotation platform  3  to rotate. When the rotating first magnet  5  cuts in the position below one second magnet body  6  which is suspending above it, the repulsive force between the two magnets brings the second magnet body  6  up, which brings the member bar group  13 ′ fixed together with the second magnet body  6  up, and the member bar group  13 ′ rotates generator  14  to produce power which is transported to outside through cable  12 . At this point, the other three second magnets  6  which get rid of the repulsive force from the first magnet body  5  go down by the function of gravity. 
         [0090]      FIGS. 4   a  and  4   b  represent the example 4. As it can be seen, the power generation device of example 4 includes lifting device and power-generating unit. 
         [0091]    Wherein, the lifting device includes: drive motor  1 , stationary axis  2  and rotation platform  3 , which have the same structures and position relations as that of the corresponding components in example 1. 
         [0092]    The lifting device further includes the first magnet body  5  which consists of four magnets having the same shape fixedly arranged on an identical circumference of the rotation platform  3  at equal interval. 
         [0093]    The lifting device further includes support bracket  4 , second magnet body  6 , oscillating piece  15  and movement body  16 . The support bracket  4  is installed around the rotation platform  3 , which is corresponding to the arrangement of the first magnet body  5 ; there is magnetic support  42  with concave part installed on the support bracket  4 . The oscillating piece  15  is a lever-type oscillating piece including pipe fittings  151 , a relatively smooth movement pipeline  152  is installed inside the said pipe fittings  151  and the movement body  16  can move therein; a magnetic pivot  153  is installed at the position adjacent to the center part of the pipe fittings  151 , the said magnetic pivot  153  has a shape of water drop which corresponds to the shape of the concave part of magnetic support  42  and has magnetism repulsive to and size slightly smaller than that of the magnetic support  42 . The lever-type oscillating piece  15  can be suspending above the support bracket  4  due to the suspension above magnetic support  42  of magnetic pivot  153 . The second magnet body  6  having the magnetism repulsive to that of the first magnet body  5  is fixedly below the end, more adjacent to the rotation platform  3 , of pipe fittings  151  and above the first magnet body  5 . A bumper bracket  154  is installed at the other end of the pipe fittings  151 ; a dashpot  17  with a bumper bracket  154  inserted therein is installed at the side, far away from the rotation platform  3 , of support bracket  4 ; there is also a stabilization bracket  155  installed above the pipe fittings  151  to stabilize the said pipe fittings  151  and prevent it from occurring swing deviation. 
         [0094]    In addition, there is also a damper strut  18  installed between the support bracket  4  and the rotation platform  3  where is adjacent to the rotation platform. A cushion  181  is positioned above the said damper strait  18  to prevent the second magnet body  6  from going down overly to impact the rotation platform  3 . 
         [0095]    Metal coil  10  of the power-generating unit is installed in pipe wall of lifting channel  9 ; magnet  11  is installed in the movement body  16 . 
         [0096]    Meanwhile, magnet  11  or metal coil  10  in the power-generating unit is also installed on wall of the dashpot  17 ; the bumper bracket  154  is installed with metal coil  10  or magnet  11  in the power-generating unit, correspondingly. 
         [0097]    The said power-generating unit further includes cable  12  connected with the metal coil  10  which transports generated power outside. 
         [0098]    The working process of the power generation device of the said example is described as follows. 
         [0099]    At initial position, four second magnet bodies  6  are placed at the identical horizontal plane. The drive motor  1  is started up to rotate the rotation platform  3 , in turn drives the first magnet body  5  which is fixed on the rotation platform  3  to rotate. When the rotating first magnet  5  cuts in the position below the second magnet body  6  which is suspended above it, the repulsive force between the two magnets brings the second magnet body  6  up, in turn brings the end installed with the second magnet body  6  of the oscillating piece  15  up, the said oscillating piece  15  swings up and down vertically about a pivot, the other end point of which goes down and drives the bumper bracket  154  to move up and down vertically inside the dashpot  17 , so as to ensure that the suspended pipe fittings  153  swings left and right vertically at a uniform set speed which provides the movement body  16  and bumper bracket  154  with movement potential energy. When movement pipeline  152  inside the oscillating piece  15  is in heeling condition, the movement body  16  installed inside the movement pipeline  152  starts to move along it by the function of gravity, that is to say, metal coil  10  installed in pipe wall of lifting channel  9  moves relative to magnet  11  installed in movement body  16  to produce power, and the generated power is transported to public grid through cable  12 . At the same point, the bumper bracket  154  moves inside the dashpot  17  to produce power also. 
         [0100]    When the rotation platform  3  rotates and drives the first magnet body  5  to leave the second magnet body  6 , one end of the oscillating piece  15  adjacent to the rotation platform  3  goes down by the function of gravity, the other end which is far away from the rotation platform  3  goes up. When its lifting channel  152  inclines in a contrary direction, the movement body  16  does reverse movement and produces power again which is transported to public grid. The process repeats in cycle. 
         [0101]      FIGS. 5   a ,  5   b  represent the power generation device according to example 5. Both the basic structure and working principle of the said power generation device are same as that in example 4. The difference is only in that: the magnetic pivot  153  of the lever-type oscillating piece  15  is installed at the end of pipe fittings  151  which is far away from the rotation platform, and the bumper bracket  154  is installed at lower part of the lever-type oscillating piece  15  at a position adjacent to the center of the lever-type oscillating piece  15 . As the magnetic pivot  153  is setup at the position adjacent to the rotation platform, there is no need to setup damper strut  18  and cushion  181 . 
         [0102]      FIGS. 5   c ,  5   d  represent the other two forms of layout of the first magnet body  5  of power generation device of example  5 . In  FIG. 5   c , the first magnet body  5  includes six magnets arranged on an identical circumference of rotation platform  3  at equal interval; while the first magnet body  5  includes three magnets arranged on an identical circumference of rotation platform  3  at equal interval in  FIG. 5   d.    
         [0103]    Please refer to  FIGS. 6   a  to  6   d . As it can be seen, the power generation device of example 6 includes lifting device and power-generating unit. 
         [0104]    Wherein, the lifting device includes: drive motor  1 , stationary axis  2  and rotation platform  3  which can rotate about the stationary axis  2  by the drive motor  1 ; there are roll balls installed between the rotation platform  3  and the stationary axis  2  so as to reduce pivoting friction of the rotation platform  3 . The first magnet body  5  includes three magnets having the same shape which are fixed on an identical circumference on the upper plane of the rotation platform  3  at equal interval. 
         [0105]    The said lifting device further includes support bracket  4 , second magnet body  6 , movement body  16  and oscillating piece  15 . The support bracket  4  is installed at the upper part of stationary axis  2  of rotation platform  3  and setup with magnetic support  42  with concave part. Oscillating piece  15 ′ is a disc-type oscillating piece which has a diameter corresponding to that of rotation platform  3 . The disc-type oscillating piece  15 ′ includes pipe fittings  151 ′ which are arranged as rings. A relatively smooth movement pipeline  152 ′ is installed inside the said pipe fittings  151 ′ and the movement body  16  can move therein; there is a disc-type stabilization bracket  155 ′ installed on the ring-type pipe fittings  151 ′, the said disc-type stabilization bracket  155 ′ is setup with a magnetic pivot  153 ′ shaped as water drop at the center of its lower part. The said magnetic pivot  153 ′ has the shape corresponds to, the magnetism repulsive to, and the size slightly smaller than, that of the concave part of magnetic support  42 , so as to form magnetic suspension. The way of arrangement of the magnetic pivot  153 ′ and magnetic support  42  enables the disc-type oscillating piece  15 ′ suspending above the support bracket  4 . The second magnet body  6  includes two magnets positioned below the pipe fittings  151 ′ symmetrically with respect to the center of the disc-type stabilization frame  155 ′, and locates above the rotation track of the first magnet body  5  and has the magnetism repulsive to that of second magnet body  6 . 
         [0106]    In the said lifting device, there is a damper strut  18 ′ positioned at the external side of rotation platform  3 , the said damper strut  18 ′ has a buffer platform  182 ′ extending to the position between rotation platform  3  and disc-type oscillating piece  15 ′, the said buffer platform is installed with a cushion  181 ′ so as to prevent the said disc-type oscillating piece  15 ′ from dropping down overly to impact the rotation platform  3 . 
         [0107]    The power-generating unit includes metal coil  10 , magnet  11  and cable  12 . As it can be seen from  FIGS. 7   a  and  7   f , there are several forms of layout of the metal coil  10  and magnet  11  for power generation. As it can be seen from  FIGS. 7   a  and  7   b , metal coil  10  is setup in movement body  16 , magnet  11  is setup in external pipe wall of movement pipeline  152 ′. Or else, as it can be seen from  FIGS. 7   c  and  7   d , metal coil  10  is setup in movement body  16 , magnet  11  is setup in external and inner pipe wall of movement pipeline  152 ′ or in inner-side pipe wall of movement pipeline  152 ′ as in  FIGS. 7   e  and  7   d . Through a trolleybus-style sliding track buckle-grasps (not shown), the metal coil of movement body  16  is connected with cable  12  which transports generated power to public grid. 
         [0108]    The working process of the power generation device of the said example is described as follows. 
         [0109]    At initial position, four second magnet bodies  6  are placed at an identical horizontal plane. The drive motor  1  is started up to rotate the rotation platform  3 , in turn drives the first magnet body  5  which is fixed on the rotation platform  3  to rotate. When the rotating first magnet  5  cuts in the position below the second magnet body  6  which is suspended above it, the repulsive force between the two magnets brings the second magnet body  6  up, in turn brings the part of the oscillating piece  15 ′ which is installed with the second magnet body  6  up, the said oscillating piece  15 ′ swings up and down vertically about magnetic pivot, the other side of oscillating piece  15 ′ which is opposite to the one installed with the second magnet body  6  goes down. When movement pipeline  152 ′ inside the oscillating piece  15 ′ is in heeling condition, the movement body  16  installed inside the movement pipeline  152 ′ moves along it by the function of gravity, that is to say, metal coil  10  installed inside the pipe wall of movement pipeline  152 ′ moves relative to magnet  11  installed in movement body  16  to produce power, the generated power is transported outside through cable  12 . 
         [0110]    When the rotation platform  3  rotates and drives the first magnet body  5  to leave the second magnet body  6 , one end of the oscillating piece  15  adjacent to the rotation platform  3  goes down by the function of gravity, the other end which is far away from the rotation platform  3  goes up. When its lifting channel  152  inclines in a contrary direction, the movement body  16  does reverse movement and produces power again which is transported to outside. The process repeats in cycle. 
         [0111]    As shown in  FIGS. 8   a  to  8   e , the power generation device according to example 7 includes lifting device and power-generating unit. 
         [0112]    Wherein, the lifting device includes: drive motor  1 , stationary axis  2  and rotation platform  3  which can rotate about the stationary axis  2  by driving from the drive motor  1 ; there are roll balls installed between the rotation platform  3  and the stationary axis  2  so as to reduce pivoting friction of the rotation platform  3 . The first magnet body  5  includes three magnets having the same shape which are fixed on the external circumference of the rotation platform  3  at equal interval. 
         [0113]    The said lifting device further includes support bracket  4 , second magnet body  6 , pulley block  7 , rope  8 , lifting channel  9  and movement body  16 . The support bracket  4  is positioned around the rotation platform  3 ; the pulley block  7  is setup on the support bracket  4 . The said pulley block  7  includes pulley reversing mechanism  71  positioned rightly above the rotation platform  3 , fixed pulleys  72 ,  73  are fixed on the support bracket  4  symmetrically relative to the pulley reversing mechanism  71 . The rope  8  rounds the fixed pulleys  72 ,  73  as well as pulley reversing mechanism  71  and has a lower end connected to the second magnet body  6 , while the other end of the rope  8  goes around the pulley reversing mechanism  71 , and the pulley reversing mechanism  71  is connected with disc-shaped lifting stand  19 . The lifting channel  9  includes cylindrical upstream channel  91  and bow-shaped downlink channel  92 . The said bow-shaped downlink channel  92  with relatively smooth inner wall is installed at the side of upstream channel  91 ; the upstream channel  91  has an upper opening leading to the upper opening of downlink channel  92  and a lower opening connecting with the lower opening of downlink channel  92 . The lifting stand  19  can move up and down inside the cylindrical upstream channel  91 . The movement body  16  can move downward along the downlink channel  92 . 
         [0114]      FIGS. 8   c  to  8   d  represent several forms of layout of downlink channel  92  of the power generation device in  FIG. 8   a.    
         [0115]    The power-generating unit includes metal coil  10 , magnet  11  and cable  12 . 
         [0116]      FIGS. 9   a  to  9   g  represent several forms of layout of metal coil  10  and magnet  11  of the power generation device in  FIG. 8   a . As shown in  FIGS. 9   a  to  9   g , the movement body  16  is setup with wheels  161 . Metal coil  10  and magnet  11  for power generation can be arranged as the following three forms: as shown in  FIGS. 9   a  and  9   b , metal coil  10  is installed inside the movement body  16 , magnet  11  is installed in pipe wall of upstream channel  91 ; as shown in  FIGS. 9   c  and  9   d , metal coil  10  is installed in pipe wall of the upstream channel  91 , magnet  11  is installed in the movement body  16 ; as shown in  FIGS. 9   e ,  9   f  and  9   g , metal coil  10  is installed on the wheel axle, and magnet  11  is installed on the wheel hub. 
         [0117]      FIGS. 10   a  to  10   i  represent several available structures of movement body  16  and downlink channel  92  of the power generation device shown in  FIG. 8   a.    
         [0118]    The working process of the said example is as follows. 
         [0119]    At initial position, two second magnet bodies  6  are placed at an identical horizontal plane; movement body  16  stays at the upper opening of the downlink channel  92 . 
         [0120]    Meanwhile, the movement body  16  is driven to move downward along the upstream channel  91  by tiny force. As metal coil  10  and magnet  11  can be arranged according to any one of the three forms of layout mentioned above, there is electromagnetic induction occurring between the metal coil  10  setup in movement body  16  and magnet  11  during the process of movement body  16  moving downward along the upstream channel  91 , so as to produce power. The generated power is transported to the cable  12  installed at inner side of pipe wall of the downlink channel  92  through elastic buckle-grasping sliding wheel  161  connected with metal coil  10 , and then to public grid through the cable  12 . When the movement body  16  moves to lower end of the downlink channel  91 , it&#39;s driven to reverse and moves from the lower opening of the downlink channel  92  into the lifting stand  19  which is just connected to the lower opening. At this point, the drive motor  1  is started up to rotate the rotation platform  3 , in turn drives the first magnet body  5  which is fixed on the rotation platform  3  to rotate. When one of the rotating first magnet body  5  cuts in a position below one of the second magnet body  6  which is suspended above it, the repulsive force between them brings the second magnet body  6  up and the other second magnet body  6  down, the up and down movements of the two second magnet bodies  6  drives rope  8 , in turn brings the lifting stand  19  up by the pulley reversing mechanism  71 ; the movement body  16  is lifted up along the upstream channel  91  until it reaches the upper opening of the upstream channel  91 , at this point, the lifting stand  19  connects to the upper opening of the downlink channel  92 ; at the same time, the movement body  16  is driven to move into the upper opening of the downlink channel  92  by control and move downward again to produce power. During the process of movement body  16  moving downward along the upstream channel  91  again, the second magnet body  6  leaves the first magnet body  5 , the lifting stand  19  goes down by the function of its gravity until it reaches the bottom of the upstream channel  91  and connects to the lower opening of the downlink channel  92 . The movement of movement body  16  repeats in cycle. 
         [0121]    As the speed of up-down circulation of the second magnet body  6  is faster than that of movement body  16 , during one up-down circulation of movement body  16 , the second magnet body  6  has finished several ones. Therefore, the said power generation device is further installed with another set of lifting device and power-generating unit to prevent from wasting kinetic energy produced by the second magnet body  6 . 
         [0122]    Specifically, the power-generating unit of the said example further includes generator  14 . Correspondingly, in the lifting device, lifting channel  9 ′ is positioned around the second magnet body  6 . The second magnet body  6  can slide up and down along the inner wall of lifting channel  9 ′ through roller wheel  61 . The second magnet body  6  further connects with member bar group  13 ′ which includes vertical rod  132 ″ and link bracket  134 , the second magnet body  6  is clamping connected to one end of the link bracket  134  whose another end fixed with the vertical rod  132 ″ whose another end connected the rotor of the power generator  14 . 
         [0123]    By adopting the said structure, during the process of movement body  16  moving downward, as the first magnet body  5  rotates continually, the second magnet body  6  finishes several up-down circulations which drives the link bracket  134 , in turn brings the vertical rod  132 ″ up and down, thereby rotates the rotor of power generator. The process repeats and produces power in cycle. 
         [0124]      FIG. 11  represents example 8. The power generation device of example 8 includes the lifting device and the power generation mechanism in example 7. In the present example, the lifting stand of the said lifting device is installed with water tank  20  with a valve. The power generation mechanism in the present example includes liquid chamber  31 , shift device  32 , discharge device  33 , waterless pipeline  34 , movement body  16  and power-generating unit. 
         [0125]    Liquid chamber  31  is a cube container for storing certain amount of water. The shift device  32  is installed at the lower part of the liquid chamber  31  with the upper trap door, air hole and side trap door. The upper trap door can be opened or closed so as to make the liquid chamber  31  connect to or separate from the shift device  32 . The side trap door can be opened or closed so as to make the shift device  32  connect to or separate from the waterless pipeline  34 . The discharge device  33  is installed at one side of or under the shift device  32  with a capacity larger than that of the shift device  32 . 
         [0126]    The discharge device  33  has discharge hole leading to the shift device  32 , the liquid in the shift device  32  can enter into the discharge device  33  through the discharge hole. The discharge device  33  further includes the discharge pipe  331  whose end leads to upstream channel  91 , in turn to the valve of water tank  20 , so as to timely discharge the liquid discharged from the shift device  32  into the lifting water tank  20  and prepare for the next liquid discharge. The discharge device  33  also has air hole (not shown). 
         [0127]    During the process of power generation, liquid in the discharge device  33  is pumped into the lifting water tank  20  at the bottom of the upstream channel  91  through the discharge pipe  331  to drive the first magnet body  5  to rotate, when the first magnet body  5  moves to the position below the second magnet body  6 , the second magnet body  6  fixed to the rope  8  is driven to go up by the repulsive force from the same magnetism of the two magnets, which rotates the pulley block  7  through rope  8 , in turn brings the lifting water tank  20  up. The lifting water tank  20  is lifted until it connects with the liquid inlet pipeline  311 , at this point, the valve setup at one side of the lifting water tank  20  is opened by control, liquid therein flows back into the liquid chamber  31  through the liquid inlet pipeline  311  to ensure sufficient quantity of liquid in the liquid chamber  31 , thus ensure that the power generation device works in cycle. 
         [0128]    The waterless pipeline  34  is installed at external side of the liquid chamber  31  which includes upward delivery pipeline, downlink pipeline descending from high to low, as well as downward delivery pipeline. The upward delivery pipeline has one end connected to the upper opening of the liquid chamber  31  with the delivery sliding device installed thereon and the other end connected to the beginning end of the downlink pipeline which is installed underground the side of the liquid chamber  31 ; the terminal end of the downlink pipeline connects to one end of the downward delivery pipeline whose the other end connected to side trap door of the shift device  32 . Each of the pipelines is installed with smooth track therein (not shown); the movement body  16  moves along the track of waterless pipeline  34 . 
         [0129]    The buffer drive device  35  is placed at the set location in liquid chamber  31  to buffer the speed of movement body  16  at the moment it ascends to the water surface. The buffer drive device  35  includes buffer board, balance frame  472  set up on the buffer board, sprocket column  473  set up between the balance frames  472 . A power generator can be arranged above the liquid chamber  31 , so that sprocket column  473  can engagement with the motor rotating toothed wheel of the power-generating unit  44  to produce power by transferring the ascending kinetic energy into electric power. 
         [0130]    The power-generating process in this example can be divided into two parts; those are the process of power generation by descending movement of movement body  16  in waterless pipeline  34  and the process of power generation by ascending movement of movement body  16  in liquid chamber  31 . Movement body  16  is hollow oblate sphere with rotating wheel  161  whose floatage is greater than its gravitation. As shown in  FIG. 17   a , magnet  11  for power generation is installed in inner wall of downlink pipeline, metal coil used for power generation is installed in the movement body  16 , and cable  12  is connected to the coil  10  to transport the generated power outside. The coil can be installed in inner wall of downlink pipeline and the magnet  11  installed in movement body  16 , alternatively. Besides, the coil and magnet installed in rotating wheel  161  are also doable. The ascending power-generating unit includes power-generating unit (not shown) installed above the liquid chamber  31  and buffer transmission device  35 . 
         [0131]    About the specific working principle of the said example, please refer to another patent application PCT/CN2006/002239 by the identical applicant. 
         [0132]    As shown in  FIGS. 12   a  to  12   c , the power generation device according to example 9 includes lifting device and power-generating unit. 
         [0133]    Wherein, the lifting device includes: drive motor  1 , stationary axis  2  and rotation platform  3  which can rotate about the stationary axis  2  by driving from the drive motor  1 ; there are roll balls installed between the rotation platform  3  and the stationary axis  2  so as to reduce pivoting friction of the rotation platform  3 . The first magnet body  5  includes four magnets having the same shape which are fixed on the external circumference of the rotation platform  3  at equal interval. 
         [0134]    The said lifting device further includes support bracket  4 , second magnet body  6 , movement body  16  and hydraulic lifting device  21 . The support bracket  4  is installed around the rotation platform  3 ; the hydraulic lifting device  21  includes liquid reservoir  211 , hydraulic cylinder  212 , piston  213  positioned inside the said hydraulic cylinder  212 , extension sleeve  214 , as well as lifting stand  19  fixed on the upper top of the extension sleeve  214 . The liquid reservoir  211 , hydraulic cylinder  212  and extension sleeve  213  are connected with each other through hydraulic pipeline  215 . Both structures and ways of arrangements of the upstream channel  91 , downlink channel  92  and movement body  16  are same as that in example mentioned above. The second magnet body  6  fixed together with piston  213  by a connection pod  216  is placed above the track of the first magnet body  5  and has the magnetism repulsive to it. The extension sleeve  214  is installed in the stationary axis  2 . When the extension sleeve  214  is in the station of contraction, the lifting stand  19  installed thereon connects to the lower opening of the upstream channel  91 . 
         [0135]    The working process of the power generation device of the said example is as follows. 
         [0136]    At initial position, two second magnet bodies  6  are placed at an identical horizontal plane and far away from the first magnet body  5 ; movement body  16  is placed on the lifting stand  19  which connects to the upper opening of the downlink channel  92 . 
         [0137]    The movement body  16  moves by control into the upper opening of downlink channel  92 ; then the said movement body  16  moves downward along the downlink channel  92  by tiny force; metal coil  10  moves relative to magnet  11  and produces power which is transported to public grid through cable  12 . At the same time, the drive motor  1  is started up to rotate the rotation platform  3 , in turn drives the first magnet body  5  fixed on the rotation platform  3  to rotate. When the rotating first magnet  5  cuts in the position below the second magnet body  6  which is suspending above it, the repulsive force between them brings the second magnet body  6  up, thus release push force onto piston  213 ; as the gravity of the lifting stand  19  and the extension sleeve  214  is greater than the push force from hydraulic liquid, they go down gradually and the hydraulic liquid flow back, until the lifting stand  19  moves to reach the bottom of the upstream channel  91  so as to connects to the lower opening of the downlink channel  92 . When the movement body  16  moves to the lower end of the upstream channel  91 , it is driven to move into the lifting stand  19  by control, and at the same time, the first magnet body  5  is just rotates to leave the second magnet body  6  by control. Then the second magnet body  6  which gets rid of the repulsive force goes down by function of gravity, and pushes the piston  213  fixed together with it to move down. The hydraulic liquid are contracted and push the extension sleeve to extend, in turn to push the lifting stand  19  to go up with the movement body  16  until it reaches the position connected to the upper opening of downlink channel  92 . At this point, the movement body  16  is driven into the downlink channel  92  and repeats previous process. The whole process repeats in cycle which produces power. 
         [0138]      FIG. 13  represents the power generation device according to example 10 whose structure is basically same as that of example 8. The difference is only in that: the lifting channel  22 , upstream channel  91  and extension sleeve  214  of hydraulic lifting mechanism  21  of the present example are installed underground. 
         [0139]      FIG. 14  represents the power generation device according to example 11 which includes the lifting device and power generation mechanism in example 9. In the present example, the lifting stand of the said lifting device is replaced by the lifting water tank  20  with valve. The power generation mechanism in the present example includes liquid chamber  31 , shift device  32 , discharge device  33 , waterless pipeline  34 , tank  36  and power-generating unit. 
         [0140]    Liquid chamber  31  is a cube container for storing certain amount of water. 
         [0141]    The shift device  32  is installed at the lower part of the liquid chamber  31 , with the upper trap door and air hole (not shown). The upper trap door installed with liquid inlet hole and first through hole at its upper part separates the liquid chamber  31  from the shift device  32 . 
         [0142]    The discharge device  33  is installed under the shift device  32  with a capacity larger than that of the shift device  32 . The discharge device  33  has discharge hole (not shown) leading to the shift device  32 , the liquid in the shift device  32  can enter into the discharge device  33  through the discharge hole. The discharge device  33  further includes the discharge pipe  331  whose end leads to upstream channel  91 , in turn to the valve of water tank  20 , so as to timely discharge the liquid discharged from the shift device  32  into the lifting water tank  20  and prepare for the next liquid discharge. The discharge device  33  also has air hole. The lifting water tank  20  is lifted up by the lifting device, and then the liquid in it are re-pumped into the liquid chamber  31  for use through water pump and liquid inlet pipeline  311  so as to ensure that the power generation device works in cycle. 
         [0143]    The tank  36  includes two hollow tanks each with several liquid in-out openings  364  that can be opened/closed installed thereon, wherein, the location of the lower liquid in-out opening corresponds to the location of liquid inlet opening installed on the upper trap door. The relationship between gravitation and flotage of the tank  36  can be changed through filling liquid to its hollow part or discharging liquid from it to convert kinetic energy into electric energy by doing descending and ascending movements in liquid chamber  31  continuously to generate power. 
         [0144]    There are two rows of pulley block  37  installed under the liquid chamber  31  and two rows of power generator unit  14 ′ above the liquid chamber  31  both corresponding to the said two hollow tanks  36 . The amount of the power generator unit  14 ′ is the same as that of pulley block  37 . The said pulley block  37  includes pulley and toothed belt; correspondingly, a plurality of fixing parts and second through holes are installed on the tank  36 . The positions of the first and second through holes are corresponding to each other, respectively. The pulley is fixed under the liquid chamber  31 . The toothed belt whose upper end rounds the motor wheel and lower end passes through the first and second through holes goes around the said pulley positioned under the liquid chamber  31  to form an approximate rectangle. The said tank  36  is fixed at one vertical edge of the said approximate rectangle by fixing component. The movement of the tank  36  is transported to the motor wheel in each power-generating unit though the pulley block  372  to drive the power-generating unit  14 ′ to rotate for producing power. 
         [0145]    About the specific working principle of the said example, please refer to another patent application PCT/CN2006/002239 by the identical applicant. 
         [0146]      FIG. 15  represents the power generation device according to example 12. The said device includes lifting device and power-generating unit. 
         [0147]    Wherein, the lifting device includes drive motor  1 , support platform  3 ′, support bracket  4 , first magnet body  5 , second magnet body  6 , large piston  25 , movement body  16 , hydraulic bumper bracket  26  and lifting channel  9 . 
         [0148]    Cylindrical support platform  3 ′ is fixedly positioned underground with circular lifting channel  9  installed at its center. Columnar setback-type cylinder block  22  is installed above the supporting platform  3 ′. A cover-like large piston  25  is arranged inside a smaller upper part  22   a  of the cylinder block  22 , and may slid up and down inside the smaller upper part  22   a  by touching with the inner wall of the cylinder block  22  through pulley  23 . 
         [0149]    The first magnet body  5  includes two natural magnets with symmetrical shapes connected to the drive motor  1 , arranged on both sides of the lifting channel  9  symmetrically and touching with the upper surface of the supporting platform  3 ′ through roller wheel  51 . The two magnets of the first magnet body  5  can do, along the upper surface of the supporting platform  3 ′, back and forth liner movements which make them jointed to or separated from each other inside the larger lower part  22   b  of the columnar setback-type cylinder block  22 .  FIGS. 16   a  to  16   j  represent these jointed-separated states under five forms of layout of the first magnet body  5 . The second magnet body  6  also includes two identical magnets fixed under the edge of the cover-like large piston  25  which are positioned on the tracks of the two first magnet bodies  5 , respectively. The said second magnet body  6  has the position corresponding to and the magnetism repulsive to that of the closed first magnet body  5 . 
         [0150]    Hydraulic buffer device  26  includes water tank  261 , water tank piston  262 , bumper bracket  263  fixed on the water tank piston  262  and buffer board  264  fixed on the top of the bumper bracket  263 . The said buffer board  264  penetrates into the lower part of shifting channel  9 . The discharge pipe  265  is connected with the water tank  261  and the outside environment which is a water reservoir  266 . The circular movement body  16  is connected to the large piston  25  at the center of its lower part through lifting rod  24  and inserted into the lifting channel  9 . 
         [0151]    The power-generating unit includes metal coil  10 , magnet  11  and cable  12 . The metal coil  10  is setup on the movement body  16 , the magnet  11  is setup in the pipe wall of the lifting channel  9 , and the cable  12  is connected with the metal coil  10  to transport the generated power to outside. 
         [0152]    The working process of the power generation device of the said example is described as follows. 
         [0153]    At initial position, the movement body  16  penetrates into the lower part of the lifting channel  9  and touches the buffer board  264 ; the two first magnet bodies  5  are separated from each other. The drive motor  1  is started up and moves the first magnet bodies  5  to joint with each other. When the moving first magnet body  5  cuts in the position below the second magnet body  6  which is suspending above it, the repulsive force between the two magnets brings the second magnet body  6  up, in turn pushes the large piston  25  up, thus brings the movement body  16  up. That is to say, metal coil  10  moves relative to magnet  11  and produces power which is transported to public grid through cable  12 . When the moving first magnet body  5  moves to a position far away from the second magnet body  6  on the large piston  25 , the large piston  25  goes down at a set speed by the function of gravity which presses the movement body  16  to move downward relative to the lifting channel  9 . That is to say, metal coil  10  moves relative to magnet  11  and produces power which is transported to public grid through cable  12 . In order to prevent the movement body from impacting onto the bottom of the lifting channel  9  and hence damaging the power generation device, a hydraulic buffer device  26  is mounted. Wherein, the discharge pipe  265  extends into the water reservoir  266 . When the movement body  16  which is moving downward touches the buffer board  264 , it presses the buffer board  264  and in turn presses the water tank piston  262  to move downward. At this point, as the press force acted on the buffer board  264  by the movement body is greater than the water pressure at the outlet of the discharge pipe  265 , the water tank piston  262  presses the liquid in the water tank  261  and discharges them outside. When the first magnet body  5  is driven to move to a location under the second magnet body  6 , the repulsive force between the two magnet bodies brings the second magnet body  6  up again, in turn brings the movement body  16  up, at this point, the press force acted on the buffer board  264  is reduced. When the said press force becomes smaller than the water pressure at the outlet of the discharge pipe  265 , the liquid will flow into the water tank  261  naturally as compensation. The whole process repeats and produces power in cycle. 
         [0154]      FIGS. 17   a  to  17   c  represent the power generation device according to example 13 which has the basically same structure as that in example 12. The difference is only in that: each of the support platform  3 ′ and the cylinder block  22  is designed as a cube. The power-generating unit is generator. A plurality of generators  14  are connected to the large piston  25  at its lower part through a plurality of lifting rods  23 . When the first magnet body  5  moves to leave the location corresponding to the second magnet  6 , the large piston  25  which loses the support of magnetic force goes down by the function of gravity. That is to say, the generator  14  is driven to rotate by the lifting rod  23  to produce power. 
         [0155]      FIG. 18  represents the power generation device according to example 14 whose structure is basically same as that in example 12. The difference is only in that: the said device is installed in the liquid; the large piston  25  is designed into the form of disc which can hold water. The gravitational potential energy of both the disk-type large piston  25  and the liquid in it can be used to produce power. Therefore, the power generation device should be hermetically-sealed; the large piston  25  is in the form of disk which can hold certain amount of water thereon. Instead of roller wheel, there is sealed ring or sealed liquid (not shown) set between the large piston  25  and the inner wall of cylinder block  22 . 
         [0156]    The working principle of the said power generation device is basically same as that in example 12. The difference is only in that: when the second magnet body  6  goes up by the repulsive force from the first magnet body  5 , the disk-type large piston  25  holds up certain amount of seawater; when the second magnet body  6  gets rid of the repulsive force from the first magnet body  5 , the large piston  25  and the seawater held thereon go down by the gravity, the movement body  16  connected with the large piston  25  through the lifting rod  24  does movement relative to the opened-closed state of the lifting channel  9  to produce power. By adopting the said structure, the manufacture material of the large piston  25  can be reduced. 
         [0157]      FIGS. 19   a  to  19   c  represent the power generation device according to example 15 whose structure is basically same as that in example 12. The difference is only in that: each of the support platform  3 ′ and the cylinder block  22  is designed as a cube. A plurality of generators  14  are connected to the large piston  25  at its lower part through a plurality of vertical rods  24 . The generators  14  are fixed on a generator bracket  141 . When the first magnet body  5  moves to leave the location corresponding to the second magnet  6 , the large piston  25  which loses the support of magnetic force goes down by the function of gravity. That is to say, the power generator  14  is driven to rotate by the vertical rod  24  to produce power. 
         [0158]    Please refer to  FIGS. 20   a  and  20   b , as it can be seen, the sea reverse osmosis device according to example 16 is installed in seawater (not shown) and includes lifting device and reverse osmosis device: drive motor  1 , support platform  3 ′, support bracket  4 , first magnet body  5 , second magnet body  6 , large piston  25 , movement body  16 , hydraulic bumper bracket  26  and lifting channel  9 . 
         [0159]    The structures of drive motor  1 , support platform  3 ′, first magnet body  5  and large piston  25  are basically same as those in example 3. 
         [0160]    Circular support platform  3 ′ and large piston  25  are fixed on the support bracket  4 . The sea reverse osmosis device installed vertically at the center of the support platform  3 ′ has a structure as follows: the osmosis chamber  27  is installed with first piston  271  therein which can swing up and down, the said first piston  271  fixedly connects with the large piston  25  through lifting rod  272 ; infiltration liquid discharge opening with one-way valve is installed on side wall of the sea osmosis chamber  27  so as to discharge seawater which infiltrate into the device to the osmosis chamber timely; the seawater delivery pipe  273  has one end connected to the osmosis chamber  27  and another end leading to ocean. One-way valve is setup on the said seawater delivery pipe  273  to prevent the seawater in the device from flowing back to the ocean. A reverse osmosis membrane  29  separates the freshwater reservoir  28  from the osmosis chamber  27 . There is also a freshwater discharge chamber  281  installed at external side of the freshwater reservoir  28 . A second piston  282  is setup in the freshwater reservoir  281  whose second link rod  283  connected with the large piston  25  through a mobile clamping-connected mechanism; the freshwater discharge pipe  284  is connected with freshwater compression chamber  281  and freshwater collecting device (not shown); a condensed water reservoir  30  leads to the lower part of the osmosis chamber  27  through condensed water transmission pipeline  301 , a condensed water discharge pipe  302  connects the condensed water reservoir  30  to a condensed water collecting device (not shown). The condensed water reservoir  30  is installed with a third piston  303  therein which can moves up and down and whose third link rod  304  connected with the large piston  25  through a mobile clamping-connected mechanism. 
         [0161]      FIGS. 20   c  and  20   d  represent the sea reverse osmosis device according to example 16 whose structure is basically same as that in example 15. The difference is only in that: as the liquid inlet opening of the seawater delivery pipe  273  is extended to a location higher than the seawater osmosis chamber  27 , thus there is no need to setup the seawater one-way valve. In addition, as shown in  FIG. 20   c , a discharge outlet can be installed so as to discharge seawater which are infiltrated into the device through the gap between the large piston  25  and cylinder block  22  timely, and it&#39;s also doable to arrange part of the support platform  3 ′ to be inclined, as shown in  FIG. 20   d.    
         [0162]    The working process of the sea reverse osmosis device of the said example is described as follows. 
         [0163]    The power generation device in the said example is installed in the ocean at a location with a depth within 200 m. At initial position, the two first magnet bodies  5  are separated from each other. The drive motor  1  is started up and moves the first magnet bodies  5  to joint with each other. When the moving first magnet body  5  cuts in the position below the second magnet body  6  which is suspending above it, the repulsive force between them brings the first piston  271 , the second piston  282  and the third piston  303  up; as the water pressure in the osmosis chamber is reduced, seawater flows thereinto through seawater delivery pipe  273 . When the water amount in the osmosis chamber  27  reaches the max value, that is, when the large piston  25  is placed above the water surface, the first magnet bodies  5  are driven to move away from each other, that is, the first magnet body  5  leaves the position rightly under the second magnet body  6 , which results in the vanish of repulsive force, the large piston  25  and the seawater held thereon go down by the gravity at a set speed, which brings the first piston  271 , the second piston  282  and the third piston  303  down vertically to press the seawater in the sea osmosis chamber  27 , freshwater in the pressed seawater flows into the freshwater reservoir  28  through osmosis membrane  29 , then into freshwater discharge chamber  281 , and is discharged into the freshwater collecting device by the pressure of second piston  282 ; the remaining condensed water are pressed into the condensed water reservoir  30  and then into the condensed water collecting chamber by the pressure of third piston  303 . The process that freshwater discharge chamber  281  and the second piston  282  setup in it empty the infiltrated water reserved therein and the process that condensed water reservoir  30  and the third piston  303  setup in it empty the infiltrated water reserved therein also can buffer the downward pressure of the first piston  271 , so as to prevent the pressure from too much to damage the mechanism and reverse osmosis membrane cooperated with it. Meanwhile, the link rod connecting the second piston  282  to the third piston  303  is also equipped with safety protection device to ensure that the second piston  282  and the third piston  303  will not impact the bottom of their chambers strongly. The whole process repeats in cycle to obtain plenty of freshwater and condensed seawater rich in mineral substance. 
         [0164]    Please refer to  FIG. 21  which represents the power generation device according to example 17. The said device is installed in seawater of coastal water and includes sea reverse osmosis device and power-generating mechanism in example 16. Wherein, the power-generating mechanism includes liquid chamber  31 , shift device  32 , discharge device  33  and waterless pipeline  34 . Since the power-generating mechanism in the said example is installed in seawater, the seawater can form a natural liquid chamber  31  used for ascending and descending movements of movement body  16 , for the purpose of saving material, there is no need to setup walls of movement chamber  31 . However, in order to control movement body  16  to move along a set route, a guiding sliding track  163  is required and ring-shaped sliding hook  164  is set up at a side of movement body  16 . The discharge device  33  is connected with the sea reverse osmosis device. Meanwhile, since all components are installed in the seawater, specialized underwater fixing device  38  is needed to fix each component. The underwater fixing device  38  includes an anchorage pile installed in the ground floor of the ocean, a steel cable fixed in the anchorage pile, a floater fixed by the steel cable, a float board support column fixed on the floater, a float board fixed on the top of the float body support column. 
         [0165]    During the process of power generation, liquid in the shift device  32  are delivered into osmosis chamber  27  of the sea reverse osmosis device by discharge device  33  through seawater delivery pipe  273  and transferred into condensed seawater and freshwater after reverse osmosis treatment by the said device. The condensed seawater and freshwater are collected into corresponding collecting device respectively to ensure that the sea reverse osmosis device can accept seawater from discharge device  33  in cycle, thus ensure that the shift device  32  can shift in cycle, so as to allow the device to produce power in cycle. About the specific working principle of the power generation device, please refer to another patent application PCT/CN2006/002239 by the identical applicant. 
         [0166]    Please refer to  FIG. 22  which represents the power generation device according to example 18. The said device is installed in seawater of coastal water and includes the sea reverse osmosis device and the power-generating mechanism in example 16, wherein the power-generating mechanism includes: liquid chamber  31 , shift device  32 , discharge device  33 , tank  36  and power-generating unit. The power-generating unit is generator  14 ′. 
         [0167]    Liquid chamber  31  is a cube container for storing certain amount of water. 
         [0168]    The shift device  32  is installed at the lower part of the liquid chamber  31 , with upper trap door and air hole. The upper trap door installed with liquid inlet hole and first through hole at its upper part separates the liquid chamber  31  from the shift device  32 . The seawater delivery pipe  273  of the sea osmosis device is connected with the shift device  32  and leads to the osmosis chamber  27  of the sea reverse osmosis device. During the process of power generation, liquid in the shift device  32  is discharged into the sea reverse osmosis device and transferred into condensed seawater and freshwater after reverse osmosis treatment by the said device. The condensed seawater and freshwater are collected into corresponding collecting device respectively to ensure that the sea reverse osmosis device can accept seawater from shift device  32  in cycle, thus ensure that the shift device  32  can shift in cycle, so as to allow the power generation device to produce power in cycle. 
         [0169]    Tank  36  is a hollow tank with a plurality of liquid in-out openings that can be opened/closed installed thereon, wherein, the location of the lower liquid in-out opening corresponds to the location of liquid inlet hole on the upper trap door  21 . The relationship between gravitation and flotage of the tank  36  can be changed through filling liquid to its hollow part or discharging liquid from it to convert kinetic energy into electric energy by making the tank  36  descend and ascend in liquid chamber continuously to generate power. 
         [0170]    The liquid chamber  31  is installed with power-generating unit  14  under it and pulley block  37  above it. The amount of the generator unit  14  is as the same as that of pulley block  37 . The said pulley block  37  includes pulley and toothed belt; correspondingly, a plurality of fixing parts and a plurality of second through holes are arranged on the tank  36 . The positions of the first and second through holes are corresponding to each other, respectively. The pulley is fixed under the liquid chamber  31 . The toothed belt whose upper end rounds the motor wheel and lower end passes through the first and second through holes goes around the pulley setup under the liquid chamber  31  to form a approximate rectangle. The said tank  36  is fixed at one vertical edge of the said approximate rectangle by fixing component. The movement of the tank  36  is transported to the motor wheel in each power-generating unit  14  though the pulley block, to drive the power-generating unit  14  to rotate for producing power. 
         [0171]    Since all components are installed in the seawater, specialized underwater fixing device  38  is needed to fix each component. The structure of the said fixing device  38  is the same as that in example mentioned above. 
         [0172]    Please refer to  FIG. 23  which represents the power generation device according to example 19. The said power generation device is installed in the seawater of coastal water and includes the sea reverse osmosis device and power generation mechanism in example 16. Wherein, the said power generation mechanism includes: liquid chamber  31 , shift device  32 , tank  36  and power-generating unit. The power-generating unit is metal coil  10  and magnet  11 . 
         [0173]    Liquid chamber  31  is a cube container for storing certain amount of water. 
         [0174]    The shift device  32  is installed at the lower part of the liquid chamber  31 , with the upper trap door and air hole (not shown). The upper trap door installed with liquid inlet hole at its upper part separates the liquid chamber  31  from the shift device  32 . 
         [0175]    Through the said discharge hole, liquid in the shift device  32  can be discharged to seawater delivery pipe  273  whose end leads to the osmosis chamber  27  of the sea reverse osmosis device. During the process of power generation, liquid in the shift device  32  are discharged into osmosis chamber  27  of the sea reverse osmosis device and transferred into condensed seawater and freshwater after reverse osmosis treatment by the said device. The condensed seawater and freshwater are collected into corresponding collecting device respectively to ensure that the sea reverse osmosis device can accept seawater from shift device  32  in cycle, thus ensure that the shift device  32  can shift in cycle, so as to allow the power generation device to produce power in cycle. 
         [0176]    Tank  36  is a hollow tank with a plurality of liquid in-out openings that can be opened/closed installed at its upper and lower part, wherein, the location of the lower liquid in-out opening corresponds to the location of liquid inlet hole on the upper trap door. The relationship between gravitation and flotage of the tank  36  can be changed through filling liquid to its hollow part or discharging liquid from it to convert kinetic energy into electric energy by making the tank  36  descend and ascend in liquid chamber continuously to generate power. In order to control the distance between the tank  36  and the inner wall of liquid chamber  31  and ensure that the device runs in stable state, roller wheel is setup on tank  36 . The said roller wheel touching the inner wall of liquid chamber  31  can slide thereon. 
         [0177]    The form of layout of the power-generating unit is as follows: coil  10  is installed in the inner wall of liquid chamber  31 , magnet  11  is installed in the tank  36 , and cable  12  is connected to the metal coil to transport the generated power to outside. 
         [0178]    About the specific working principle of the power generation device, please refer to another patent application PCT/CN2006/002239 by the identical applicant. 
         [0179]    Further modifications and alternative embodiments of various aspects of the invention will be apparent to those skilled in the art in view of this description. Accordingly, this description is to be construed as illustrative only and is for the purpose of teaching those skilled in the art the general manner of carrying out the invention. It is to be understood that the forms of the invention shown and described herein are to be taken as examples of embodiments. Elements and materials may be substituted for those illustrated and described herein, parts and processes may be reversed, and certain features of the invention may be utilized independently, all as would be apparent to one skilled in the art after having the benefit of this description of the invention. Changes may be made in the elements described herein without departing from the spirit and scope of the invention as described in the following claims.