Abstract:
A blade-type fluid transmission device includes a rotor eccentrically located in the room of a stator and the outer periphery of the rotor is tangent to the inner periphery of the room. At least one blade is pivotably connected to stator and movably inserted in at least one slot of the rotor. The distal end of the at least one blade is in contact with the inner periphery of the room so as to form a space for receiving fluid between the outer periphery of the rotor and the inner periphery of the room. The contact between the at least one blade and the inner periphery of the room increases the efficiency for transmitting fluid which enters into the stator from an inlet and leaves from the stator from an outlet.

Description:
CROSS REFERENCE 
     The present application is Division of co-pending U.S. application Ser. No. 13/555,201 by the same inventors filed on Jul. 23, 2012. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to a fluid transmission device, and more particularly, to a blade-type fluid transmission device. 
     BACKGROUND OF THE INVENTION 
     The conventional blade-type pump generally comprises a stator, a rotor and at least one blade, wherein the stator has a room defined therein. The stator has an inlet and an outlet so that the room communicates with outside of the stator. Fluid enters into the room via the inlet and leaves the room via the outlet. The rotor is eccentrically located in the room and the outer periphery of the rotor is in contact with the inner periphery of the room. Multiple blades are taken as an example. The rotor has slots for accommodating the blades therein. The blades each have one end pointing the center of the rotor and the other end of each of the blades is in contact with the inner periphery of the room. A space is defined between the inner periphery of the room and the outer periphery of the rotor. By the contact between the rotor, the blades and the inner periphery of the room, multiple partitions are defined to receive fluid. 
     When the rotor rotates back and forth, the blades are driven by the rotor and movable back and forth within the slots due to the movement of the rotor. The volumes of the partitions vary due to the back-and-forth movement of the blades, so that the fluid is sucked into the room via the inlet and leaved from the room via the outlet. 
     The centrifugal force generated from the blades due to the rotation of the rotor drives the blades outward so as to contact the distal ends of the blades with the inner periphery of the room to pump the fluid. However, when the viscosity of the fluid is high, there will be a gap between the distal ends and the inner periphery of the room and the transmission efficiency of the fluid is reduced. 
     U.S. Pat. No. 4,212,603, U.S. Pat. No. 5,087,183, U.S. Pat. No. 5,160,252, U.S. Pat. No. 5,181,843 and U.S. Pat. No. 5,558,511 respectively discloses a fluid transmission device which comprises a stator with an annular groove which shares a common center with the room. The axles of the blades are engaged with the annular groove which guides the movement of the blades. The rotor is eccentrically located in the room and the axis of each of the blades points the center of the rotor, so that the shape of the inner periphery of the room is like oval inner periphery which is difficult to be machined during manufacturing processes. Furthermore, the blades each have a certain thickness, in order to prevent interference between two adjacent distal ends of the blades and the inner periphery of the room, the distal end of each blade is made to be sharpened. The sharp distal end of the blade may vibrate when the fluid passes therethrough and noise is therefore generated. The vibration also generates partial thermo stress which accelerates fatigue of the material at the distal end of the blade. 
     The present invention intends to provide a fluid transmission device which improves the shortcomings of the conventional fluid transmission devices. 
     SUMMARY OF THE INVENTION 
     The present invention relates to a fluid transmission device and comprises a stator having a room defined therein and the room has a circular inner periphery. The stator has an inlet and an outlet, the inlet and the outlet communicate with the room. A rotor has a cylindrical body and a shaft extends through the cylindrical body. The cylindrical body is eccentrically located in the room and the outer periphery of the cylindrical body is tangent to the inner periphery of the room. The inlet and the outlet are respectively located adjacent to the position where the outer periphery of the cylindrical body is tangent to the inner periphery of the room. Two slots are defined diametrically in the outer periphery of the cylindrical body and communicate with the room. The shaft extends through the stator and is connected with a power source. Two blades are respectively located within the slots. The first end of each blade points the axis of the cylindrical body and the second end of each blade is in contact with the inner periphery of the room so as to form a space for receiving fluid between the outer periphery of the cylindrical body and the inner periphery of the room. 
     Two first pieces and two second pieces are respectively pivotably connected to the stator, wherein the first pieces are located adjacent to the inner bottom of the cylindrical body and the second pieces are located adjacent to the inner top of the cylindrical body. The first pieces and the second pieces are pivoted about the center of the room. The two blades are respectively and pivotably connected to the first pieces and the second pieces by two respective axles. The blades are pivotable about the center of the room and linearly movable within the slots. A curved face is defined in the second end of each of the two blades and in contact with the inner periphery of the room. The inner periphery of the room has a radius R1. Each of the axles is pivotable by a radius R2. The curved face of the second end of each of the two blades has a radius R3. R3=R1−R2. The two blades and the first pieces are pivoted about two respective centers of the curved faces such that the second ends of the two blades are in contact with the inner periphery of the room. 
     The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view to show the fluid transmission device of the present invention; 
         FIG. 2  is an exploded view to show the fluid transmission device of the present invention; 
         FIG. 3  is a top view of the base of the fluid transmission device of the present invention; 
         FIG. 4  is a cross sectional view taken along line  4 - 4  in  FIG. 3 ; 
         FIG. 5  is a cross sectional view of the cover of the fluid transmission device of the present invention; 
         FIG. 6  is a cross sectional view of the fluid transmission device of the present invention; 
         FIG. 7  is a top view to show the fluid transmission device of the present invention, wherein the cover is removed; 
         FIG. 8  is an operational status of the fluid transmission device of the present invention; 
         FIG. 9  is another operational status of the fluid transmission device of the present invention; 
         FIG. 10  is a cross sectional view of the second embodiment of the fluid transmission device of the present invention; 
         FIG. 11  is an exploded view to show the third embodiment of the fluid transmission device of the present invention; 
         FIG. 12  is a top view to show the third embodiment of the fluid transmission device of the present invention, wherein the cover is removed; 
         FIG. 13  is an exploded view to show the first piece, the second piece and the rotor of the fourth embodiment of the fluid transmission device of the present invention; 
         FIG. 14  is an exploded view to show the first piece, the second piece and the rotor of the fifth embodiment of the fluid transmission device of the present invention; 
         FIG. 15  is an exploded view to show the sixth embodiment of the fluid transmission device of the present invention; 
         FIG. 16  is an exploded view to show the seventh embodiment of the fluid transmission device of the present invention; 
         FIG. 17  is an axial cross sectional view of the first piece in the seventh embodiment of the fluid transmission device of the present invention, and 
         FIG. 18  is an axial cross sectional view of the second piece in the seventh embodiment of the fluid transmission device of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to  FIGS. 1 and 2 , the fluid transmission device of the present invention comprises a stator  10 , a rotor  20 , two blades  32 ,  34 , two first pieces  40  and two second pieces  50 . The stator  10  comprises a base  11  and a cover  12  which is connected to the base  11 . A sealing member (not shown) may be connected between the base  11  and the cover  12 , and multiple bolts (not shown) are used to connect the base  11  and the cover  12 . As shown in  FIGS. 3 and 4 , the stator  10  has a room  13  defined therein and the room  13  has a circular inner periphery  132 . The stator  10  has an inlet  14  and an outlet  15 . The inlet  14  and the outlet  15  communicate with the room  13  and outside of the stator  10 . The stator  10  has a circular first recess  16  defined in the inner top of the room  13 . A first protrusion  17  extends from the center of the first recess  16  and shares the center with the room  13 . As shown in  FIG. 5 , the cover  12  has a second recess  18  defined in the underside thereof and faces the room  13 . A second protrusion  19  extends from the center of the second recess  18  and shares the center with the room  13 . 
     As shown in  FIGS. 2 to 7 , the rotor  20  has a cylindrical body  21  and a shaft  22  which extends through the cylindrical body  21 . The cylindrical body  21  is eccentrically located in the room  13  and the outer periphery of the cylindrical body  21  is tangent to the inner periphery  132  of the room  13 . The inlet  14  and the outlet  15  are respectively located adjacent to the position where the outer periphery of the cylindrical body  21  is tangent to the inner periphery  132  of the room  13 . The shaft  22  has one end pivotably connected to the base  11  and the other end of the shaft  22  extends through the stator  10  so as to be connected with a power source such as a motor or an inverter motor (not shown). The shaft  22  is pivotably connected with a plurality of bearings or bushes (not shown) and the bearings are connected to the base  11  and the cover  12  so allow the shaft  22  to be rotated smoothly. Two slots  23  are defined diametrically in the outer periphery of the cylindrical body  21 . One end of each of the slots  23  points the center of the cylindrical body  21  and the other end of each of the slots  23  communicates with the room  13 . A groove  24  is defined in the end face of the cylindrical body  21  and two ends of the groove  24  respectively communicate with the slots  23 . The two ends of the groove  24  are located close to the shaft  22 . 
     The two blades  32 ,  34  are respectively located within the slots  23 . The first end of each blade  32 / 34  points the axis of the cylindrical body  21 , and the second end of each blade  32 / 34  is in contact with the inner periphery  132  of the room  13  so as to form a space for receiving fluid between the outer periphery of the cylindrical body  21  and the inner periphery  132  of the room  13 . 
     The first pieces  40  and two second pieces  50  are respectively pivotably connected to the stator  10 . The first pieces  40  are located adjacent to the inner bottom of the cylindrical body  21  and the second pieces  50  are located adjacent to the inner top of the cylindrical body  21 . The first pieces  40  and the second pieces  50  are pivoted about the center of the room  13 . Each of the first and second pieces  40 ,  50  comprises a ring  42 / 52  and a protrusion  44 / 54 . The protrusion  44 / 54  is a curved protrusion and connected to the outer periphery of the ring  42 / 52 . The first pieces  40  are pivotably connected to the first recess  16  so that the first pieces  40  are adjacent to the underside of the cylindrical body  21 . The rings  42  of the first pieces  40  are mounted to the first protrusion  17  so that the first pieces  40  are pivotable about the center of the room  13 . The second pieces  50  are pivotably connected to the second recess  18  so that the second pieces  50  are adjacent to the top of the cylindrical body  21 . The rings  52  of the second pieces  50  are mounted to the second protrusion  19  so that the second pieces  50  are pivotable about the center of the room  13 . The two blades  32 ,  34  are respectively and pivotably connected to the first pieces  40  and the second pieces  50  by two respective axles  322 ,  342 . Two ends of the axle  342  are pivotably connected to the protrusions  44 ,  54  of the first and second pieces  40 ,  50 . When the rotor  20  rotates, the first and second pieces  40 ,  50  drive the axles  322 ,  342  to make the blades  32 ,  34  be pivoted about the center of the room  13 . In the meanwhile, the blades  32 ,  34  are linearly movable in the slots  23 . The rings  42  are mounted to the first protrusion  17  so that when the first pieces  40  rotate, there will be no interference between the first pieces  40  and the first protrusion  17 . Therefore, the rotation of the first pieces  40  is reliable. The rings  52  are mounted to the second protrusion  19  so that when the second pieces  50  rotate, there will be no interference between the second pieces  50  and the second protrusion  19 . Therefore, the rotation of the second pieces  50  is reliable. 
     A curved face  324 / 344  is defined in the second end of each of the two blades  32 ,  34  and in contact with the inner periphery  132  of the room  13 . The inner periphery  132  of the room  13  has a radius R1. Each of the axles  322 ,  342  is pivotable by a radius R2. The curved face  324 / 344  of the second end of each of the two blades  32 ,  34  has a radius R3. The relationship of the three radiuses can be expressed by the equation R3=R1−R2. The two blades  32 ,  34  and the first pieces  40  are pivoted about two respective centers of the curved faces  324 ,  344  (the axes of the axles  322 ,  342 ) such that the second ends of the two blades  32 ,  34  are in contact with the inner periphery  132  of the room  13 . Therefore, the efficiency of transmission of the fluid is increased and the manufacturing processes for making the room  13  are simplified. 
     A power source (not shown) is connected to the shaft  22  to rotate the rotor  20 , the blades  32 ,  34  are rotated about the center of the room  13  and, the blades  32 ,  34  are respectively rotated relative to the first and second pieces  40 ,  50 . The blades  32 ,  34  are moved along the slots  23 . When the rotor  20  rotates clockwise, as shown in  FIGS. 8 and 9 , the space for receiving fluid in the room  13  are varied along with the rotation of the rotor  20  in the room  13 , such that the fluid is sucked into the room  13  via the inlet  14  and the fluid is transmitted by the blades  32 ,  34  and then flows out from the outlet  15 . When the rotor  20  rotates counter-clockwise (not shown in  FIGS. 8 and 9 ), the fluid is sucked into the room  13  via the outlet  15  and the fluid is transmitted by the blades  32 ,  34  and then flows out from the inlet  14 . Therefore, by controlling the direction of rotation of the rotor  20 , the fluid can be transmitted in desired direction. 
     When the rotor  20  rotates, the blades  32 ,  34  are rotated about the respective axles  322 ,  342 , and the axles  322 ,  342  move circularly about the center of the room  13  By cooperation of the radius R3 of the curved faces  324 ,  344 , the curved faces  324 ,  344  of the blades  32 ,  34  are in contact with the inner periphery  132  of the room  13  without interference so as to increase the efficiency of transmission of fluid. The inner periphery  132  of the room  13  is a round inner periphery which reduces the difficulties of machining. 
     Furthermore, when the blades  32 ,  34  move in the slots  23  back and forth, because the first ends of the two blades  32 ,  34  point the center of the room  13 , and the two slots  23  are in communication with each other via the grooves  24 , so that the fluid within the space between the two respective first ends of the blades  32 ,  34  and the shaft  22  flows between the two slots  23  via the grooves  24 . This avoids the positive/negative pressure applied to the two blades  32 ,  34  so that the blades  32 ,  34  move smoothly. The number of the blades  32 ,  34  can be three or more than three, and the number of the pieces  40 ,  50  is also changed along with the change of the blades  32 ,  34 . The number of the slots  23  is correspondingly changed to accommodate the blades  32 ,  34 . 
       FIG. 10  shows the second embodiment, the differences between the first and second embodiments are that each of the first recesses  16  of the stator  10  has a first dim  162  in the inner end thereof so as to reduce the contact area between the first pieces  40  and the first recesses  16  and reduce the friction between the first pieces  40  and the base  11 . Each of the second recess  18  of the stator  10  has a second dim  182  in the inner end thereof so as to reduce the contact area between the second pieces  50  and the second recesses  18  and reduce the friction between the second pieces  50  and the base  11 . Lubricant is received in each of the first and second dims  162 ,  182 . 
       FIGS. 11 and 12  show the third embodiment which comprises a stator  10 , a rotor  20 , a blade  32 , a first piece  40  and a second piece  50 . The differences between the first and third embodiments are that the slot  23  is defined radially in the outer periphery of the cylindrical body  21  and communicates with the room  13 . The blade  32  is movable in the slot  23 . 
     Each of the inlet  14  and the outlet  15  has a check valve (not shown) connected thereto so as to control the direction of the fluid. 
       FIG. 13  shows the fourth embodiment wherein the differences between the first and fourth embodiments are that each of the first and second pieces  40 ,  50  are curved plates and an arc of each of the first and second pieces  40 ,  50  is over  180  degrees. Each of the first pieces  40  is pivotably connected to the first protrusion (not shown) of the stator (not shown) and each of the second pieces  50  is pivotably connected to the second protrusion (not shown) of the stator (not shown). The blade  32  is connected to an axle  322  which is pivotably connected between the first and second pieces  40 ,  50 . The blade  34  is connected to an axle  342  which is pivotably connected between the first and second pieces  40 ,  50 . When the rotor  20  rotates, the first and second pieces  40 ,  50  drive the blades  32 ,  34  by the axles  322 ,  342  and the blades  32 ,  34  rotate about the center of the room  13 . The blades  32 ,  34  move along the slots  23  back and forth. Because the arc of each of the first and second pieces  40 ,  50  is over  180  degrees, the rotation of the first and second pieces  40 ,  50  is reliable. 
       FIG. 14  shows the fifth embodiment of the present invention, wherein the differences between the first and fifth embodiments are that each of the first and second pieces  40 ,  50  comprises a ring  42 / 52  and a protrusion  44 / 54 . The protrusion  44 / 54  is connected to the inner periphery of the ring  42 / 52 . The protrusion  44 / 54  is a curved protrusion. The protrusion  44  of ring  42  of each of the first pieces  40  is in contact with the outer periphery of the first protrusion (not shown) of the stator (not shown). The outer periphery of the ring  42  of each of the first pieces  40  is in contact with the inner wall of the first recess  16 . The protrusion  54  of ring  52  of each of the second pieces  50  is in contact with the outer periphery of the second protrusion (not shown) of the stator (not shown). The outer periphery of the ring  54  of each of the second pieces  50  is in contact with the inner wall of the second recess. The first and second pieces  40 ,  50  respectively rotate about the center of the room  13 , because the outer periphery of the ring  44 / 54  is in contact with the inner periphery of the first/second recess, so that the rotation of the first and second pieces  40 ,  50  are reliable. The blade  32  is connected to an axle  322  which is pivotably connected between the protrusions  44 ,  54  of the first and second pieces  40 ,  50 . The blade  34  is connected to an axle  342  which is pivotably connected between the protrusion  44 ,  54  of the other two first and second pieces  40 ,  50 . When the rotor  20  rotates, the first and second pieces  40 ,  50  drive the blades  32 ,  34  by the axles  322 ,  342  and the blades  32 ,  34  rotate about the center of the room  13 . The blades  32 ,  34  move along the slots  23  back and forth. 
       FIG. 15  shows the sixth embodiment of the present invention and comprises a stator  10 , a rotor  20 , a first blade  36 , a second blade  38 , a first piece  40  and a second piece  50 . The differences between the first and sixth embodiments are that the first and second pieces  40 ,  50  are ring-shaped pieces and the first pieces  40  are mounted to the first protrusion  17  and the second pieces  50  are mounted to the second protrusion (not shown). The first piece  40  and the second piece  50  are pivoted about the center of the room  13 . The first and second pieces  40 ,  50  respectively form a pivotal hole  46 / 56  and a circular guide slot  48 / 58 . The first blade  36  is pivotably connected to an axle  362  and two ends of the axle  362  are pivotably connected with the pivotal holes  46 ,  56  of the first and second pieces  40 ,  50 . The first and second pieces  40 ,  50  drive the first blade  36  to pivot about the center of the room  13  by the axle  362 . The second blade  38  is pivotably connected to a first axle  382  and a second axle  384 . The first axle  382  is connected to a first slide  386  and the second axle  384  is connected to a second slide  388 . The first slide  386  is slidably inserted into the guide slot  48  of the first piece  40  and the second slide  388  is slidably inserted to the guide slot  58  of the second piece  50 . The first and second pieces  40 ,  50  drive the first and second axes  382 ,  384  to rotate the second blade  38  to be pivotable about the center of the room  13 . The first and second slides  386 ,  388  are movable along with the guide slots  48 ,  58  back and forth. 
       FIG. 16  shows the seventh embodiment which is amended from the fifth embodiment, wherein the first and second pieces  40 ,  50  are located symmetrically relative to the cylindrical body  21 . As shown in  FIG. 17 , the first piece  40  has a pivotal hole  46  and a curved guide slot  48 . The pivotal hole  46  and the guide slot  48  are defined in the first side of the first piece  40 , the second side of the first piece  40  is a closed side. As shown in  FIG. 18 , the second piece  50  has a pivotal hole  56  and a curved guide slot  58 . The pivotal hole  56  and the guide slot  58  are defined in the first side of the second piece  50 , and the second side of the second piece  50  is a closed side. 
     While inventor have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.