Abstract:
A method of using geothermal energy to produce electricity by lowering a geothermal generator deep into pre-drilled holes below the Earth&#39;s surface. A geothermal generator includes a boiler, a turbine compartment, an electric generator, a condenser and an electric cable. The geothermal generator also includes an internal cylinder, an external cylinder and a plurality of tubes disposed between the internal cylinder and the external cylinder. The plurality of tubes is part of the condenser. In a method of using the geothermal generator, water contained within the boiler is converted to high-pressure, super heated steam due to heat contained within a pre-drilled well below the earth&#39;s surface. The steam is used to produce electric energy, which is transported to the ground surface by the electric cable.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to U.S. Provisional Patent Application to Nikola Lokic entitled “SELF CONTAINED IN GROUND GEO-THERMAL GENERATOR,” Ser. No. 60/922,440, filed Apr. 7, 2007, and to U.S. Provisional Patent Application to Nikola Lakic entitled “SELF CONTAINED IN GROUND GEO-THERMAL GENERATOR,” Ser. No. 60/927,336, filed May 2, 2007, the disclosures of which are hereby incorporated entirely herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Technical Field 
     This invention relates generally to a self-contained in-ground geothermal generator. This invention also relates to the effective use of geothermal energy. 
     2. State of the Art 
     Geothermal is a renewable energy source made possible by the same tectonic activity that causes local earthquakes and the rising of the Rocky Mountains. The earth&#39;s rigged outer shell, the lithosphere, rests upon the hotter and more plastic region of the upper mantle, below the crust, called the asthenosphere. The thickness of the earth&#39;s crust varies from a few miles to perhaps one hundred and fifty miles. Rock heated by magma deep below the surface boils water trapped in underground reservoirs—sometimes as hot as 700 degree F. Some of this hot geothermal water travels back up through faults and cracks and reaches the earth&#39;s surface as hot springs or geysers, but most of it stays deep underground, trapped in cracks and porous rock. This natural collection of hot water is called a geothermal reservoir. We already enjoy some of this activity via natural hot springs. 
     Presently, wells are drilled into the geothermal reservoirs to bring the hot water to the surface. At geothermal power plants, this hot water is piped to the surface. Then, after removing silica, steam is created and used to spin turbines to produce electricity. It&#39;s also a proven, relatively clean energy source. More than 30 nations sitting in earthquake and volcanic zones have extensively used geothermal power for decades. 
     Existing use of geothermal energy is limited with location. Geothermal resources are limited to the “shallow” hydrothermal reservoirs at the crustal plate boundaries. Much of the world is underlain (3-6 miles down), by hot dry rock—no water, but lots of heat. 
     The invention of the coal-burning steam engine revolutionized industrial production in the 18 th  c. and opened the way to the development of mechanized transport by rail and sea. The modern steam engine, using high-pressure superheated steam, remains a major source of electrical power and means of marine propulsion, though oil has replaced coil as the fuel in many installations and the reciprocating engine has given way to the steam turbines. 
     Modern wells, mostly used in the oil industry and geothermal plants, drilled using rotary drills, can achieve lengths of over 38,000 feet (12 000 meters). The well is created by drilling a hole 5 to 30 inches (13-76 cm) in diameter into the earth. Drilling technology is improving every day. The combination of drilling technology and tunneling technology can produce even better results and wider and deeper wells. 
     Accordingly, there is a need in the field of geothermal energy for an apparatus and method for effectively using the enormous heat resources of the earth&#39;s crust that are accessible by using current drilling technology. 
     DISCLOSURE OF THE INVENTION 
     The present invention relates to a self contained, in-ground geothermal generator, which continuously produces relatively cheap electric energy from renewable geothermal resources. The generator is not limited to use in the “shallow” hydrothermal reservoirs discussed above. 
     By lowering the unit with a cable into a pre-drilled well to the desired level and temperature, geothermal energy becomes controllable and production of electric energy becomes available. Electricity is produced by the generator at the in-ground unit and is then transported to the surface by an electric cable. 
     Relatively cheap and clean electric energy continuously produced from geothermal renewable source, besides common use in homes and businesses, can be used for production of hydrogen which can be used as a clean source of energy in many applications including the auto industry and can eventually replace depleting, expensive and polluting oil, coal and other fossil fuels, which are used to create electricity. Nuclear power plants with very toxic waste material can also be replaced. 
     The self contained in-ground geothermal generator comprises a slim cylindrical shape, which, positioned vertically, can be lowered with a system of cables deep into the ground in a pre-drilled well. This generator includes a boiler with water, turbines, a gear box, an electric generator and a condenser with a system of insulated tubes for returning water back into the boiler. 
     There are many areas in many countries with earthquake and volcanic zones where hot rocks can be reached in a relatively short distance from the surface. 
     The self contained geothermal generator is lowered deep in the ground to the hot rocks. The bottom part of the boiler has several vertical indents (grooves) to increase its conductive surface, thereby increasing the conductivity of heat from the hot rocks to the water inside the boiler, which produces high-pressure superheated steam, which then turns the turbines. 
     The axle of the turbine is a solid shaft and is connected to the axis of the rotor of the electric generator, which is a cylindrical shaft that rotates within generator and produces electricity. The cylindrical shape of the rotor shaft allows for steam to pass through to the condenser. The cylindrical shaft of the rotor also functions as a secondary turbine. It has a secondary set of small blades attached to the inside wall and positioned to increase the rotation of the rotor. Exhausted steam then reaches the condenser through a system of insulated tubes where the steam condenses and returns to the boiler as water. This process is repetitive and is regulated with two sets of check valves which can be activated automatically by pressure or heat or electronically by sensors and a computer in a control room on the surface. 
     The purpose of the gear box, or converter, which is located between the turbines and the generator, is to neutralize momentum produced by the spinning turbines by changing the direction of the rotor of the generator. Thus, the rotor of the generator spins in the opposite direction than the main turbines. 
     The boiler of the assembly can be also filled with liquid, such as isopentane, that boils at a lower temperature than water to make the unit functional at less depth or a lower temperature. 
     The coolant for the condenser can be filled with liquid hydrogen, nitrogen or other liquid with a higher boiling point than water. The condenser can also be cooled with cold water with an additional independent system of tubes, such as a closed loop system of tubes, which extend sufficiently, if needed, toward the surface to exchange heat. Also, if needed, the flow of cold water can be forced through the same cooling system with a water pump. If the source of cold water is accessible on the surface, additional cooling can be applied. 
     The electric transformer is not illustrated in the drawings. It can be added on top of the unit or can be separated from the assembly and carried with a separate cable to reduce the weight of the assembly. If needed, several transformers can be added and spaced at necessary distance (levels). Within the transformer, the voltage is increased before the power is sent to the surface and power lines to carry electricity to homes and businesses. 
     It should be understood that the geothermal generator includes a safety relief valve on the boiler in case of failure of one or more valves. For simplicity, such a safety relief valve is not illustrated in the drawings. 
     One objective of this invention is to provide relatively cheap and clean electric energy continuously produced from geothermal renewable source—not limited to the “shallow” hydrothermal reservoirs. Besides common uses in homes and businesses, it can be used for production of hydrogen which can be used as a clean source of energy in many applications including the auto industry and eventually replace depleting, expensive and polluting oil, coal and other fossil fuels which are used to produce electricity. Nuclear power plants with very toxic waste material can also be replaced. 
     Another objective of this invention is to provide a self contained in-ground geothermal generator. 
     A further objective of this invention is to provide a geothermal generator assembled in the vertical position, containing a boiler with water, turbines, an electric generator, and a condenser with a system of insulated pipes for returning water back to the boiler. 
     A still further objective of this invention is to provide a gear box (converter) located between the turbines and the generator to neutralize momentum produced by spinning turbines by changing the direction of the rotor of the generator to spin in the opposite direction of the main turbines. 
     A further objective of this invention is to provide slim cylindrical design and simplicity of invention. 
     Another objective of this invention is to provide structural external and structural internal cylinders with a cooling chamber between them which surrounds main compartments and extends downward with the external cylinder forming the bottom part of the boiler. 
     A still further objective of this invention is to provide multiple levels of steam pressurization with a multiple boiler system. 
     A further objective of this invention is that the external structural cylinder of the boiler has external and internal indentations to increase the conductive surface area and to increase conductivity of heat to the water inside the boiler. 
     It is also an objective of this invention that geothermal energy becomes controllable and production of relatively cheap electric energy becomes available by lowering the unit with a cable into a pre-drilled well to the desired level and temperature. 
     A further objective of this invention is that electricity is produced by a generator at the in-ground unit and transported to the surface by electric cable. 
     Another objective of this invention is that a heat exchange will occur by use of water circulations. 
     The foregoing and other features and advantages of the present invention will be apparent from the following more detailed description of the particular embodiments of the invention, as illustrated in the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be described with reference to the figures of which: 
         FIG. 1  is a cross sectional view taken along line  1 - 1 ′ of  FIG. 2  of a self contained in-ground geothermal generator, in accordance with the invention; 
         FIG. 2  is a cross sectional view of the condenser along line  2 - 2 ′ of  FIG. 1 , in accordance with the invention; 
         FIG. 3  is a cross sectional view of the generator along line  3 - 3 ′ of  FIG. 1 , in accordance with the invention; 
         FIG. 4  is an enlarged cross sectional view along line  4 - 4 ′ of  FIG. 1  illustrating the gear box, in accordance with the invention; 
         FIG. 5  is a cross sectional view along line  5 - 5 ′ of  FIG. 4 , in accordance with the invention; 
         FIG. 6  is a cross sectional view along line  6 - 6 ′ of  FIG. 4 , in accordance with the invention; 
         FIG. 7  is a cross sectional view along line  7 - 7 ′ of  FIG. 4 , in accordance with the invention; 
         FIG. 8  is a cross sectional view of the turbines along line  8 - 8 ′ of  FIG. 1 , in accordance with the invention; 
         FIG. 9  is a cross sectional view along line  9 - 9 ′ of  FIG. 1 , in accordance with the invention; 
         FIG. 10  is a cross sectional view of the boiler along line  10 - 10 ′ of  FIG. 1 , in accordance with the invention; 
         FIG. 11  is a cross sectional view taken along line  11 - 11 ′ of  FIG. 12  of another embodiment of a self contained in-ground geothermal generator, in accordance with the invention; 
         FIG. 12  is a cross sectional view of the collector along line  12 - 12 ′ of  FIG. 11 , in accordance with the invention; 
         FIG. 13  is an enlarged cross sectional view along line  13 - 13 ′ of  FIG. 11  illustrating the collector, in accordance with the invention; 
         FIG. 14  is a cross sectional view taken along line  14 - 14 ′ of  FIG. 15  of still another embodiment of a self contained in-ground geothermal generator, in accordance with the invention; 
         FIG. 15  is a cross sectional view of the condenser along line  15 - 15 ′ of  FIG. 14 , in accordance with the invention; 
         FIG. 16  is an enlarged cross sectional view along line  16 - 16 ′ of  FIG. 14  illustrating the collector, in accordance with the invention; 
         FIG. 17  is a cross sectional view taken along line  17 - 17 ′ of  FIG. 18  of still another embodiment of a self contained in-ground geothermal generator, in accordance with the invention; 
         FIG. 18  is a cross sectional view of the high pressure chamber and condenser along line  18 - 18 ′ of  FIG. 17 , in accordance with the invention; 
         FIG. 19  is a cross sectional view of the four independent chambers of the boiler and collector along line  19 - 19 ′ of  FIG. 17 , in accordance with the invention; 
         FIG. 20  is a cross sectional view of the boiler along line  20 - 20 ′ of  FIG. 17 , in accordance with the invention; 
         FIG. 21  is a cross sectional view of an alternative boiler along line  21 - 21 ′ of  FIG. 22 , in accordance with the invention; and 
         FIG. 22  is a cross sectional view taken along line  22 - 22 ′ of  FIG. 21  of still another embodiment of a self contained in-ground geothermal generator, in accordance with the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring now to  FIG. 1 , the self contained in-ground geothermal generator  10  of the invention is shown in cross sectional view along line  1 - 1 ′ of  FIG. 2 . The main elements of the assembly  10  are: the boiler  20 , the turbine compartment  30 , the gear box, or converter  40 , the electric generator  50 , and the condenser/distributor  60  with a system of tubes  62 . The boiler  20  includes a water tank  22  and a steam compartment  24 . The assembly  10  has a hook eye  71  and can be attached by hook  73  and cable  75  or with system of pulleys and cable and then lowered into pre drilled well deep in the ground to the level where rock heated by magma deep below the surface boils the water in the boiler  20 . High-pressure superheated steam passes through a set of turbines  33 , which has a set of blades  32  which are attached to a solid shaft  34  and spins it. The solid shaft  34  of the turbines  33  is connected to a cylindrical shaft  52  of the electric generator  50  through a gear box or converter  40 . Steam from the turbine compartment is stirred through a set of openings  36  and through the cylindrical shaft  52  of the generator  50  into the condenser/distributor  60 . Exhausted steam then starts condensing and is stirred through the set of openings  63  into a plurality of insulated tubes  62  and back into the boiler  20 . 
     Here is also illustrated a structural external cylinder  90  and structural internal cylinder  80  enclosing a space between them with a ring shaped disk  97  and extending downward with the external cylinder  90  forming the bottom part of the boiler with external indentations  65  and internal indentations  67 . Here is also illustrated a set of one way check vales  98  which are attached to the ends of the tubes  62  and accommodated at corresponding openings at the ring shaped disk  97 . 
     It will be understood that while particular embodiments of the present invention show the use of water within the boiler  20 , other embodiments of the present invention may utilize liquids that have lower temperature boiling points, thereby requiring less heat in order to accomplish the phase change from liquid to gas needed for the geo-thermal generator  10  to operate. 
     Referring now to  FIGS. 4-7 , the upper end of the turbine shaft  34  is solidly connected with disk  35  which extends to the peripheral cylinder  41  of the gear box  40 , with which is secured and engage with system of bearings  42  and gears wheels  43 . The gear box is secured to the main structural cylinder  80 . The disk  35  has several openings  36  for steam to leave the turbine compartment. It also extends upwardly in the shape of a funnel for steam to be funneled into cylindrical shaft  52  of the electric generator  50 . The cylindrical shaft  52  of the rotor  54  also functions as a secondary turbine. It has a secondary set of small blades  58  attached to the inside wall and positioned to increase rotation of the rotor when steam passes through. 
     Disk  35  is engaged with upper disc  37  through a set of gear wheels  43  which are secured with the peripheral cylinder  41  of the gear box  40  with their axles  44 . Upper disk  37  is also engaged with the upper part  38  of the funnel  39  through bearing  46  and with the peripheral cylinder  41  of the gear box  40  through bearing  47  and is also solidly connected to the cylindrical shaft  52  of the generator  50 . Disk  35  and disk  37  have carved grooves  45  which engage and correspond with gear wheels  43 . 
     The purpose of the gear box  40 , which is located between the turbines  33  and the generator  50 , is to neutralize momentum produced by the spinning turbines  33  by changing the direction of the rotor  54  of the generator  50  to spin in the opposite direction to the main turbines  33 . 
       FIG. 2  is a cross sectional view of the condenser/distributor  60  along line  2 - 2 ′ of  FIG. 1 .  FIG. 2  illustrates the main structural internal cylinder  80 , the external structural cylinder  90 , and insulation  92  between these two cylinders, which surround the tubes  62 . Exhausted steam passes through openings  63 , which lead to tubes  62 , which then return the condensed water to the boiler  20 . At the end of the tubes  62 , there are sets of one way check valves  98 . Here is also shown solid disk  94  which separates the generator  50  from the condenser/distributor  60 . The upper end of the cylindrical shaft  52  is secured and engaged to the disk  94  through a bearing  96 . Here is also shown electrical conduit  77  which transports electricity from the generator  10  to the surface and further to the power lines. 
       FIG. 3  is a cross sectional view of the generator  50  along line  3 - 3 ′ of  FIG. 1 .  FIG. 3  illustrates the main structural internal cylinder  80 , the external structural cylinder  90  and insulation  92  between these two cylinders, which surround the tubes  62 . Here is also illustrated cylindrical shaft  52 , rotor  54  which is fixed to the shaft  52  and stator  56  which is fixed to the main internal structural cylinder  80 . 
       FIG. 8  is a cross sectional view of the turbines  30  along line  8 - 8 ′ of  FIG. 1 .  FIG. 8  shows main structural internal cylinder  80 , external structural cylinder  90  and insulation  92  between these two cylinders, which surround the tubes  62 . Here is also illustrated solid shaft  34  and blades  32  of the turbines  33 . 
       FIG. 9  is a cross sectional view along line  9 - 9 ′ of  FIG. 1 .  FIG. 9  illustrates the lower end of the shaft  34 , which is secured and stands on the center of the platform disk  82  and is engaged with a set of bearings  84 . Disk  82  is solidly connected to main structural internal cylinder  80  and has a set of openings  86 , which accommodates a set of check valves  88 , which can be activated automatically by pressure or electronically with sensors and a computer. 
       FIG. 10  is a cross sectional view of the boiler  20  along line  10 - 10 ′ of  FIG. 1 .  FIG. 10  illustrates main structural external cylinder  90  with peripheral indentations  65  and internal indentations  67 , or protrusions, which increase the conductive surface of the boiler and increase the conductivity of heat to the water inside the boiler  20 . 
       FIG. 11  is a cross sectional view of another embodiment of a self contained in-ground geothermal generator  11  with its basic elements, along line  11 - 11 ′ of  FIG. 12 . Assembly  11  contains substantially the same elements as assembly  10  depicted in  FIGS. 1-10 , with the addition of a collector  100 . The collector  100  is part of the condenser/distributor  60  and is formed between inner structural cylinder  80  and outer structural cylinder  90  and between ring shaped disks  97  and  99 . It collects the condensed water from the tubes  62  before it is pumped into boiler  20  through water pumps  102 . 
       FIG. 12  is a cross sectional view of the collector  100  along line  12 - 12 ′ of  FIG. 11 .  FIG. 12  illustrates inner structural cylinder  80  and outer structural cylinder  90  and water pumps  102 . 
       FIG. 13  is an enlarged cross sectional view along line  13 - 13 ′ of  FIG. 11  illustrating the collector  100 .  FIG. 13  illustrates inner structural cylinder  80  and outer structural cylinder  90  and water pumps  102 .  FIG. 13  also illustrates layers of insulated materials. Heat reflected foil  91  such as aluminum or the like reduces heat convention through areas other than the boiler. There is also heat resistant insulator  93  inside the collector  100 . There are also ring shaped platform disks  97  and  99  which form top and bottom surfaces of the collector  100 . Here is also illustrated opening  104  which corresponds with water pump  102  which pumps water back into the boiler to be reheated and used again. 
       FIG. 14  is a cross sectional view of another embodiment of a self contained in-ground geothermal generator  12  with its basic elements, along line  14 - 14 ′ of  FIG. 15 . Assembly  12  contains substantially the same major elements as assemblies  10  and  11  depicted in  FIGS. 1-13 , with the addition of having a cooling compartment and heat exchanging up on the surface. Here is illustrated a condenser  60  that consists of distributor compartment  61 , cooling compartment  68  and tubes  62 . Cooling compartment  68  of the condenser  60  is formed between internal structural cylinder  80  and external structural cylinder  90  and surrounds turbine compartment  30 , gear box compartment  40 , generator compartment  50  and condenser distributor compartment  61 . Cooling compartment  68  is filled with water which circulates to the surface and back through a closed loop hose (pipe)  72  to exchange heat and to cool tubes  62  in which exhausted steam is condensed and returned as liquid into boiler  20 . Warm water leaves cooling compartment  68  through outlet connector  78  to which one end of the hose  72  is connected and travels though it up to the surface where heat is exchanged and cool water returns to the cooling compartment  68  through inlet connector  79  to which the other end of the hose  72  is connected. In this line, at the surface, the heat can be used for external uses such as installing a radiator to the system. Alternatively, this radiator can be submerged into a pool of water, or a set of pools, for heat exchange which then can have external uses such as in cold climates for heating houses or some other applications where warm water is needed. When using a set of pools, each pool may have a different temperature allowing the exchange of heat within each pool and the ability to use the exchanged heat for other purposes, wherein varying levels of heat are required. Also, in this line, one or more water pumps can be installed to increase circulation. Also in this line, a different coolant with a higher boiling point than water can be used instead of water. 
       FIG. 15  is a cross sectional view of the condenser  60  along line  15 - 15 ′ of  FIG. 14 .  FIG. 15  illustrates condenser  60 , distribution compartment  61 , cooler  68 , tubes  62 , cylindrical shaft  52 , internal structural cylinder  80  and external structural cylinder  90 . 
       FIG. 16  is an enlarged cross sectional view along line  16 - 16 ′ of  FIG. 14  illustrating collector  100 .  FIG. 16  illustrates inner structural cylinder  80  and outer structural cylinder  90  and water pumps  102 . Also illustrated are layers of insulated materials. Heat reflected foil  91  such as aluminum or the like reduces heat convection through areas other than the boiler. There is also heat resistant insulator  93  inside collector  100 . There are also ring shaped disks  97  and  99  which form the top and bottom surfaces of the collector  100 . Here is also illustrated opening  104  which corresponds with water pump  102  which pumps water back into the boiler to be reheated and used again. Here are also illustrated tubes  62  in which exhausted steam is condensed and delivered to collector  100  before returning to boiler  20  through water pump  102 . Here is also illustrated tube  64  which is connected to inlet connector  79  and delivers cool water to the bottom of the cooler  68 . 
       FIG. 17  is a cross sectional view of another embodiment of a self contained in-ground geothermal generator  14  with its basic elements, along line  17 - 17 ′ of  FIG. 18 . Assembly  14  contains substantially the same major elements as assemblies  10 ,  11  and  12  depicted in  FIGS. 1-16  with the addition of having boiler  20  divided into several chambers, providing multiple levels of steam pressurization with multiple boiler chambers. 
       FIG. 18  is a cross sectional view of the high pressure chamber  25  and cooler  68  along line  18 - 18 ′ of  FIG. 17 . 
       FIG. 19  is a cross sectional view of the four independent chambers of the boiler  20  and collector  100  along line  19 - 19 ′ of  FIG. 17 . 
       FIG. 20  is a cross sectional view of the boiler along line  20 - 20 ′ of  FIG. 17 . 
     Referring now to  FIGS. 17-20 , there are illustrated upper part  24  of boiler  20  divided with disc  101  forming high pressure chamber  25 . Remaining chamber  24  is farther divided with two vertical walls  106  and  108 , forming four independent chambers, or protrusions,  112 ,  114 ,  116  and  118  which communicate with upper chamber  25  through pumps  105  located on platform disk  101  and aligned with openings  107 . High pressured steam from chamber  25  is released into turbine chamber  30  through a set of automatic check valves  88  which are located on platform disk  82  and aligned with openings  86 . Chamber  25  is refilled and pressurized with steam from the four independent chambers  112 ,  114 ,  116  and  118  through pumps  105 , which correspond with openings  107  located on platform disk  101 . This process is cyclical, providing high pressure steam in chamber  25  almost continuously. An alternative option is to divide chamber  25  by providing only one of the two walls  106  or  108  and providing two independent high pressure chambers which would then each be supplied by steam from two independent chambers. 
       FIG. 21  is a cross sectional view of an alternative shape of the lower part of the boiler  23  along line  21 - 21 ′ of  FIG. 22 . 
       FIG. 22  is a cross sectional view of another embodiment of a self contained in-ground geothermal generator  15  with its basic elements, along line  22 - 22 ′ of  FIG. 21 . Assembly  15  contains substantially the same elements as assemblies  10 ,  11 ,  12 , and  14  depicted in  FIGS. 1-20 . Assembly  15  is almost identical to the assembly  14  illustrated and explained in  FIGS. 17-20 , with the exception of the shape of the lower part of the boiler  23 . There are four cylinders, or protrusions,  112 ,  114 ,  116  and  118 , attached to the platform base  120  which has corresponding openings  122 . The importance of the shape of the lower part of the boiler is in increasing surface area to increase the conductivity of heat from hot rocks to the water inside the boiler, which produces high-pressure superheated steam, which turns the turbines. 
     This invention explains a method of how to use unlimited sources of geothermal energy which has not been used in this way today. This invention explains how to use internal heat of our planet and produce electricity deep down and transport it to the surface by cable. This invention explains self contained geothermal generator with its basic elements, their shape, form and interactions and their functions. 
     In this presentation, turbines, generator, pumps, check valves and safety relief valves are not illustrated in details but there are many reliable, heat resistant, automatic, fast action pumps and check valves, turbines and generators used in power plants, steam engines, marines industry, and the like that may be applicable in embodiments of the present invention. Further, according to particular embodiments of the present invention, the length of the chambers are not limited to the respective sizes as represented in the drawing figures of this disclosure, but rather they may be of any desired length. 
     The sizes of elements of this invention, such as the diameter, are limited to drilling technology at the time, diameter of the wells and practical weight of the assembly. Combination of well drilling technology and tunneling technology could provide larger diameter of the wells and more powerful self contained in-ground geothermal generator. 
     Additionally, particular embodiments of the present invention may use a cable, chain or other suitable means for lowering the geo-thermal generator into the hole drilled. Once in the hole, the cable or chain may be used to hang the geo-thermal generator at a desired depth. Further, the geo-thermal generator may be rested upon a bottom surface within the drilled hole to support the generator. This configuration is particularly useful in limiting constant tension on the cable or chain. 
     The embodiments and examples set forth herein were presented in order to best explain the present invention and its practical application and to thereby enable those of ordinary skill in the art to make and use the invention. However, those of ordinary skill in the art will recognize that the foregoing description and examples have been presented for the purposes of illustration and example only. The description as set forth is not intended to be exhaustive or to limit the invention to the precise form disclosed. Many modifications and variations are possible in light of the teachings above without departing from the spirit and scope of the invention.