Patent Publication Number: US-10774834-B2

Title: Spherical compressor

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Patent Application No. PCT/CN2017/078509, filed on Mar. 29, 2017 which claims the benefit of priority from Chinese Application Nos. 201610243847.1 and 201620333567.5, filed on Apr. 20, 2016. The content of the aforementioned applications, including any intervening amendments thereto, are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The disclosure relates to a spherical compressor. 
     BACKGROUND 
     A spherical compressor is a newly invented variable-volume mechanism with a novel structure. The spherical compressor requires no intake/exhaust valve, few moving parts, and has the advantages of small vibration, high mechanical efficiency, reliable sealing performance, etc. There are many patents of spherical compressors, such as Chinese Patent No. 03114505.1 (titled “Variable-volume Mechanism for Compressor”), CN200610104569.8 (titled “Spherical Compressor Capable of Multi-stage Compression”), and CN201010264211.8 (titled “Hinge Sealing Automatic Compensation Mechanism for Spherical Compressor”). The application and development of spherical compressors have made steady progress in recent years. Spherical compressors can be widely used in various fields such as gas compressors, refrigerator and refrigeration air-conditioning compressors and pump machinery. Various power machines based on spherical compressors are undergoing industrialization. 
     Since the rotation of a piston of an existing spherical compressor is powered by an eccentric main shaft, when the main shaft rotates to the point where the axis of a turntable coincides with the axis of the piston, the resultant force of the main shaft acting on the turntable perpendicularly intersects with the axis of the piston and the axis of the turntable, so that the torque of the piston rotating around the axis of the piston is zero and the piston cannot rotate, thus causing clamping stagnation of the mechanism, which is the dead center of the mechanism. The Chinese Patent No. 201410100390.X titled “Anti-Locking Mechanism for Rotor of Spherical Compressor” aims to solve the problem of locking at a dead center of a spherical compressor. Specifically, a pin boss is added to a turntable shaft; a guide sleeve is arranged on the pin boss; a concave sliding chute is arranged on a base spherical surface of a cylinder body or a lower spherical surface of the cylinder body; and the concave sliding chute is distributed on the sliding track of the guide sleeve on the corresponding base spherical surface of the cylinder body or the lower spherical surface of the cylinder body during the rotation of a turntable. At the moment when the rotating torque of the turntable is zero, when the main shaft drives the turntable, the contact force generated by the guide sleeve and the concave sliding chute can still keep the turntable moving, so that the turntable is not prone to clamping stagnation, fundamentally solving the dead center problem during the movement of the spherical compressor mechanism. However, high precision of the concave sliding chute is required to ensure a good fit between the guide sleeve and the concave sliding chute, and a cooling mechanism is needed to prevent heat generation caused by friction of the guide sleeve and the concave sliding chute during the movement of the anti-locking mechanism, thus increasing manufacturing and operation costs. 
     SUMMARY 
     This application is to design a novel spherical compressor based on the existing spherical compressor so that the spherical compressor is a mechanism without dead center. 
     The spherical compressor includes: 
     a cylinder body having a hemispherical inner cavity and a turntable shaft hole in communication with an outside of the cylinder body; 
     a cylinder head having a hemispherical inner cavity; wherein the cylinder head is combined with the cylinder body to form a spherical inner cavity; an intake passage, an exhaust passage and a piston shaft hole are provided on an inner spherical surface of the cylinder head; the intake passage and the exhaust passage on the cylinder head are arranged in an annular space perpendicular to an axis of the piston shaft hole; the intake passage and the exhaust passage communicate with an intake hole and an exhaust hole on the cylinder head in communication with the outside of the cylinder body, respectively; 
     a piston having a spherical top surface, two side faces which form an angle and a piston pin boss at the lower part of the two side faces; where the spherical top surface of the piston and the spherical inner cavity have the same center and form a sealed loose fit; the piston pin boss is a semi-cylinder; a middle part of the semi-cylinder is provided with a groove; a piston pin hole which penetrates is provided on a central axis of the semi-cylinder; a piston shaft protrudes from a center of the spherical top surface of the piston; and an axis of the piston shaft passes through the center of the spherical top surface of the piston; 
     a turntable having a turntable pin boss corresponding to the piston pin boss; wherein the turntable pin boss is arranged at an upper part of the turntable; an outer peripheral surface between the upper part and a lower end face of the turntable is a turntable spherical surface; the turntable spherical surface has the same center with the spherical inner cavity and is closely attached to the spherical inner cavity to form a sealed loose fit; two ends of the turntable pin boss are provided with semi-cylindrical grooves; a middle part of the turntable pin boss is provided with a protruding semi-cylinder; a turntable pin hole which penetrates is formed on a central axis of the semi-cylinder; a turntable shaft protrudes from a center of a lower end of the turntable; and the turntable shaft passes through the center of the turntable spherical surface; and 
     a center pin inserted into a pin hole formed by matching the turntable pin boss with the piston pin boss to form a cylindrical hinge; wherein matching surfaces of the cylindrical hinge form a sealed loose fit; 
     wherein the axis of the piston shaft hole and the axis of the turntable shaft hole both pass through the center of the spherical inner cavity; and an included angle between the axis of the piston shaft hole and the axis of the turntable shaft hole is a; a sliding chute swinging mechanism is arranged between the piston shaft and the piston shaft hole or between the turntable shaft and the turntable shaft hole; the sliding chute swinging mechanism between the piston shaft and the piston shaft hole allows the piston to swing along a sliding chute relative to the axis of the piston shaft hole; and the sliding chute swinging mechanism between the turntable shaft and the turntable shaft hole allows the turntable to swing along the sliding chute relative to the axis of the turntable shaft hole with a swing amplitude of 2α; the turntable shaft is driven to rotate so that the piston and the turntable relatively swing around the center pin; and a V1 working chamber and a V2 working chamber with alternatively variable volumes are formed between the upper end face of the turntable, the two side faces of the piston and the spherical inner cavity. 
     Further, a rotary sleeve in a cylindrical shape is arranged in the piston shaft hole on the cylinder head. An outer cylinder of the rotary sleeve is coaxial with the piston shaft hole, and the rotary sleeve can rotate around the axis of the piston shaft hole. A rotary sleeve sliding chute in a direction of an axis of the center pin is arranged on an end face of the rotary sleeve, and two side faces of the rotary sleeve sliding chute are symmetrically arranged on both sides of a plane of the axis of the center pin and the axis of the piston shaft hole. A piston shoe is fixedly arranged at an end of the piston shaft, and the piston shoe is arranged in the rotary sleeve sliding chute. Two side faces of the piston shoe are attached to two side faces of the rotary sleeve sliding chute and slide along the two side faces of the rotary sleeve sliding chute to form a loose fit, and the rotary sleeve sliding chute on the rotary sleeve and the piston shoe on the piston shaft form the sliding chute swinging mechanism. The turntable shaft is inserted into the turntable shaft hole on the cylinder body to form a rotating pair with the cylinder body, and a sealing plug is arranged at an end of the piston shaft hole on the cylinder head. 
     A piston shaft pin hole is provided at the end of the piston shaft. A piston shoe shaft hole and a piston shoe pin hole matched with the piston shaft pin hole are provided at a center of the piston shoe, and the piston shaft is inserted into the piston shoe shaft hole after passing through a via hole through which the piston shaft hole communicates with the spherical inner cavity. A fixing pin is inserted into a pin hole formed by matching the piston shoe pin hole with the piston shaft pin hole to fix the piston shoe at the end of the piston shaft. The two side faces of the piston shoe are parallel planes, and the two side faces of the piston shoe are attached to the two side faces of the rotary sleeve sliding chute respectively to form a loose fit. 
     The turntable shaft extends out of the cylinder body and is connected to a power mechanism to serve as a power input end of the compressor. 
     Further, a lower end of the cylinder body is connected to a main shaft through a main shaft support. An upper end of the main shaft is placed in the turntable shaft hole, and an outer cylinder at the upper end of the main shaft is coaxial with the turntable shaft hole. The main shaft rotates around the turntable shaft hole. A main shaft sliding chute is provided on an upper end face of the main shaft in a direction of an axis of the center pin, and two side faces of the main shaft sliding chute are symmetrically arranged on both sides of a plane of the axis of the turntable shaft hole and the axis of the center pin. A piston shoe is fixedly arranged at the end of the turntable shaft, and the piston shoe is arranged in the main shaft sliding chute. Two side faces of the piston shoe are attached to the two side faces of the main shaft sliding chute and slide along the two side faces of the main shaft sliding chute to form a loose fit, and the main shaft sliding chute on the main shaft and the piston shoe on the turntable shaft form the sliding chute swinging mechanism. 
     A lower end of the main shaft is connected to a power mechanism. 
     A turntable shaft pin hole is provided at the end of the turntable shaft. A piston shoe shaft hole and a piston shoe pin hole matched with the turntable shaft pin hole are provided at a center of the piston shoe, and the turntable shaft is inserted into the piston shoe shaft hole after passing through a via hole through which the turntable shaft hole communicates with the spherical inner cavity. A fixing pin is inserted into a pin hole formed by matching the piston shoe pin hole with the turntable shaft pin hole to fix the piston shoe at the end of the turntable shaft. The two side faces of the piston shoe are parallel planes, and the two side faces of the piston shoe are attached to the two side faces of the main shaft sliding chute respectively to form a loose fit. 
     The piston shaft hole on the cylinder head communicates with the outside of the cylinder body, and the piston shaft extends out of the piston shaft hole and is connected to the power mechanism to serve as the power input end of the compressor. 
     Further, the piston includes a piston insert. The piston insert is of a fan-shaped block structure with thick sides and a thin middle, and is embedded in the groove in the middle part of the piston pin boss of the piston. The shape of an inner cylindrical surface of the piston insert is matched with the shape of a protruding semi-cylindrical surface of the turntable to form a sealed loose fit. A protruding top surface of the piston insert is an outer cylindrical surface which is matched with a bottom surface of the groove of the piston pin boss of the piston. Two side faces of the piston insert are flush with the two side faces of the piston, and two end faces of the piston insert form a sealed loose fit with two side walls of the groove in the middle part of the piston pin boss. 
     The present application has the following advantages: 
     1. the spherical compressor is a mechanism without dead center; 
     2. the spherical compressor requires a simple structure, a small number of parts and low processing precision; 
     3. there is no power consumption loss caused by friction and heating when passing through a dead-center mechanism, and there is no need to arrange a special cooling mechanism; and 
     4. the spherical compressor can be widely used in refrigeration compressors, air conditioning compressors, air compressors and pump machinery. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic diagram of a first embodiment of the present invention; 
         FIG. 2  is a cross-sectional view taken along an A-A line in  FIG. 1 ; 
         FIG. 3  is a cross-sectional view taken along a B-B line in  FIG. 2 ; 
         FIG. 4  is a schematic diagram of a cylinder head of the first embodiment of the present invention; 
         FIG. 5  is a cross-sectional view taken along a C-C line in  FIG. 4 ; 
         FIG. 6  is a cross-sectional view taken along a D-D line in  FIG. 4 ; 
         FIG. 7  is a schematic diagram of a cylinder body of the first embodiment of the present invention; 
         FIG. 8  is a cross-sectional view taken along an E-E line in  FIG. 7 ; 
         FIG. 9  is a schematic diagram of a rotary sleeve; 
         FIG. 10  is a schematic diagram of a piston shoe; 
         FIG. 11  is a schematic diagram of a piston of the first embodiment of the present invention; 
         FIG. 12  is a schematic diagram of a turntable of the first embodiment of the present invention; 
         FIG. 13  is a schematic diagram of a piston insert; 
         FIG. 14  is a schematic diagram of a second embodiment of the present invention; 
         FIG. 15  is a cross-sectional view taken along a G-G line in  FIG. 14 ; 
         FIG. 16  is a cross-sectional view taken along an F-F line in  FIG. 14 ; 
         FIG. 17  is a schematic diagram of a piston of the second embodiment of the present invention; 
         FIG. 18  is a schematic diagram of a turntable of the second embodiment of the present invention; 
         FIG. 19  is a schematic diagram of a main shaft of the second embodiment of the present invention; 
         FIG. 20  is a schematic diagram of a cylinder head of the second embodiment of the present invention; 
         FIG. 21  is a cross-sectional view taken along an H-H line in  FIG. 20 ; 
         FIG. 22  is a cross-sectional view taken along an I-I line in  FIG. 20 ; 
         FIG. 23  is a schematic diagram of a cylinder body of the second embodiment of the present invention; 
     
    
    
     
         
         
           
             Reference numerals:  1 —cylinder head;  2 —cylinder body;  3 —piston;  4 —center pin;  5 —turntable;  6 —rotary sleeve;  7 —sealing ring;  8 —bearing;  9 —piston shaft sleeve;  10 —fixing pin;  11 —sealing plug;  12 —main shaft;  13 —main shaft support;  14 —piston shoe;  15 —needle bearing;  16 —sliding chute swinging mechanism; 
               101 —intake hole;  102 —exhaust hole;  103 —intake passage;  104 —exhaust passage;  105 —piston shaft hole;  201 —turntable shaft hole;  301 —piston shaft;  302 —piston pin hole;  303 —piston shaft pin hole;  304 —piston insert;  501 —turntable shaft;  502 —turntable pin hole;  503 —turntable shaft pin hole;  601 —rotary sleeve sliding chute;  141 —piston shoe shaft hole;  142 —piston shoe pin hole;  121 —main shaft sliding chute; 
               1001 —V1 working chamber; and  1002 —V2 working chamber. 
           
         
       
    
     DETAILED DESCRIPTION OF THE 
     Example 1 
       FIGS. 1-13  show the illustration of the first embodiment. As shown in  FIGS. 1-8 , the spherical compressor includes a cylinder head  1 , a cylinder body  2 , a piston  3 , a center pin  4  and a turntable  5 . The cylinder body  2  and the cylinder head  1  have hemispherical inner cavities, and the cylinder body  2  and the cylinder head  1  are fixedly connected by screws to form a casing of the spherical compressor with a spherical inner cavity. An intake passage  103 , an exhaust passage  104  and a piston shaft hole  105  are provided on the inner spherical surface of the cylinder head  1 . The cylinder body  2  is provided with a turntable shaft hole  201  in communication with the outside of the cylinder body. One side of the turntable shaft hole  201  communicates with the spherical inner cavity, and the other side is provided with a bearing seat hole which is coaxial with the turntable shaft hole  201 . The axis of the piston shaft hole  105  and the axis of the turntable shaft hole  201  both pass through the center of the spherical inner cavity, and the included angle between the axis of the piston shaft hole  105  and the axis of the turntable shaft hole  201  is a. The intake passage  103  and the exhaust passage  104  on the cylinder head  1  are arranged in an annular space perpendicular to the axis of the piston shaft hole  105  on the inner spherical surface. An intake hole  101  and an exhaust hole  102  are further formed on the outer surface of the cylinder head  1 . The intake hole  101  communicates with the intake passage  103 , and the exhaust hole  102  communicates with the exhaust passage. 
     As shown in  FIGS. 9-12 , the piston  3  has a spherical top surface, two side faces which form an angle and a piston pin boss at the lower part of the two side faces. The spherical top surface of the piston and the spherical inner cavity formed by the cylinder body  2  and the cylinder head  1  have the same center and form a sealed loose fit. The piston pin boss is a semi-cylinder, and a piston pin hole  302  which penetrates is provided on the central axis of the semi-cylinder. The piston pin boss at the lower part of the piston  3  is provided with an opening so as to form a fan-shaped cavity on the piston pin boss of the piston  3 . The opening of the piston  3  is located in the middle of the piston pin boss and perpendicular to the axis of the piston pin hole  302  of the piston pin boss, and the width of the opening of the piston  3  is matched with the width of the semi-cylinder of the turntable pin boss. The turntable  5  has a turntable pin boss corresponding to the piston pin boss, and the turntable pin boss is arranged at the upper part of turntable  5 . The outer peripheral surface between the upper part and the lower end face of the turntable  5  is a turntable spherical surface. The turntable spherical surface and the spherical inner cavity have the same center and are closely attached to each other to form a sealed loose fit. The two ends of the turntable pin boss are provided with semi-cylindrical grooves, the middle part of the turntable pin boss is provided with a protruding semi-cylinder, and a turntable pin hole  502  which penetrates is formed in the center of the semi-cylinder. A turntable shaft  501  matched with the turntable shaft hole  201  on the cylinder body  2  is fixedly provided at the center of the lower end of the turntable  5 , and a piston shaft  301  is fixedly provided at the center of the spherical top surface of the piston  3 . The turntable shaft  501  is inserted into the turntable shaft hole  201  on the cylinder body  2  to form a rotating pair with the cylinder body  2 . The center pin  4  is inserted into a pin hole formed by matching the turntable pin boss with the piston pin boss to form a cylindrical hinge, and the matching surfaces of the cylindrical hinge form a sealed loose fit. The piston  3  and the turntable  5  form a sealed loose connection through the cylindrical hinge, and the two ends of the cylindrical hinge and the spherical inner cavity form a sealed loose fit. 
     The piston shaft hole  105  on the cylinder head  1  communicates with the spherical inner cavity of the cylinder head  1  through a via hole, and the radial dimension of the via hole is smaller than the diameter of the piston shaft hole  105 . An annular positioning surface is formed at the lower end of the piston shaft hole  105 . The piston shaft hole  105  on the cylinder head  1  is provided with a rotary sleeve  6  in a cylindrical shape which is placed in the piston shaft hole  105 . The end face of the rotary sleeve  6  is attached to the annular positioning surface. The outer cylinder of the rotary sleeve  6  is coaxial with the piston shaft hole  105 . The rotary sleeve  6  can rotate around the axis of the piston shaft hole  105 . As shown in  FIG. 9 , a rotary sleeve sliding chute  601  which can slide in the direction of the axis of the center pin  4  is arranged on the end face of the rotary sleeve  6 . The two side faces of the rotary sleeve sliding chute  601  serve as sliding working surfaces and are symmetrically arranged on both sides of a plane of the axis of the center pin  4  and the axis of the piston shaft hole  105  in the cylinder head  1 . A piston shoe shaft hole  141  is provided at the center of the piston shoe  14 . As shown in  FIG. 10 , the two side faces of the piston shoe  14  are parallel planes. A piston shaft pin hole  303  is provided at the end of the piston shaft  301 , and a piston shoe pin hole  142  is formed in the corresponding position of the piston shoe  14 . After the piston shaft  301  passes through the via hole through which the piston shaft hole  301  communicates with the spherical inner cavity, the end of the piston shaft  301  is inserted into the piston shoe shaft hole  141 . A fixing pin  10  is inserted into a fixing pin hole formed by the piston shaft pin hole  303  and the piston shoe pin hole  142 , and the piston shoe  14  is fixed to the end of the piston shaft  301  by the fixing pin  10 . The two side faces of the piston shoe  14  are attached to the two side faces of the rotary sleeve sliding chute  601  respectively, and a loose fit is formed along the two side faces of the rotary sleeve sliding chute  601  in a sliding manner. The two side faces of the piston shoe  14  are parallel to the plane of the axis of the piston shaft hole  105  and the axis of the center pin  4 . The rotary sleeve sliding chute  601  on the rotary sleeve  6  and the piston shoe  14  on the piston shaft  301  form a sliding chute swinging mechanism  16 . The turntable shaft  501  is inserted into the turntable shaft hole  201  in the cylinder body  2  to form a rotating pair with the cylinder body  2 . The turntable shaft  501  is driven to rotate so that the turntable  5  drives the piston  3  to move through the cylindrical hinge. The movement of the piston  3  is rotation around the axis of the piston shaft hole  105  and swings around the center pin  4  relative to the turntable  5 . Meanwhile, the piston  3  swings along the two side faces of the rotary sleeve sliding chute  601  on the rotary sleeve  6  through the piston shoe  14  at the end of the piston shaft  301  relative to the axis of the piston shaft hole  301  on the cylinder head  1  with a swing amplitude of 2α. The length of the two side faces of the rotary sleeve sliding chute  601  in the direction of the axis of the center pin  4  should be long enough to ensure that the swing of the piston shoe  14  is not interfered. In this embodiment, the sliding chute swinging mechanism  16  is used to provide the piston  3  with a degree of freedom to swing along the two side faces of the rotary sleeve sliding chute  601 . 
     The piston  3  swings around the axis of the center pin  4  relative to the turntable  5 , and a V1 working chamber  1001  and a V2 working chamber  1002  with alternatively variable volumes are formed between the upper end face of the turntable  5 , the two side faces of the piston  3  and the spherical inner cavity. The intake passage  103  and the exhaust passage  104  on the cylinder head  1  are arranged in an annular space perpendicular to the axis of the piston shaft hole  105 , and the intake passage  103  and the exhaust passage  104  communicate with an intake hole  101  and an exhaust hole  102  in the cylinder head  1  respectively. The intake hole  101  and the exhaust hole  102  communicate with the outside of the cylinder body  2 . The air intake and discharge control is realized by the rotation of the piston  3 , and when the working chambers need to discharge air or introduce air, the corresponding working chamber communicates with the intake passage  103  or the exhaust passage  104 . 
     As shown in  FIG. 3 , in this embodiment, the turntable shaft  501  extends out of the cylinder body  2  and is connected to a power mechanism to serve as a power input end of the compressor. A sealing ring  7  is arranged on the inner side of the portion, engaged with the turntable shaft hole  201  on the cylinder body  2 , of the turntable shaft  501 , and a bearing  8  is arranged at the end of the engagement portion. The power mechanism drives the turntable shaft  501  to rotate, and the volumes of the V1 working chamber  1001  and the V2 working chamber  1002  change constantly and alternately. In  FIG. 2 , the V1 working chamber  1001  and the V2 working chamber  1002  are in the ultimate state. The V1 working chamber  1001  is in a state that the air intake of the spherical compressor has completed, so the theoretical volume of the V1 working chamber  1001  in the figure is maximum, and the V2 working chamber  1002  is in a state of starting the air intake of the next cycle after discharging the air, so the theoretical volume of the V2 working chamber  1002  in the figure is zero. Each time the turntable shaft  501  drives the turntable  5  to rotate by one cycle, the piston  3  rotates around the axis of the piston shaft hole  105  by one cycle, and at the same time, the piston  3  swings once along the two side faces of the rotary sleeve sliding chute  601  relative to the axis of the piston shaft hole  105  on the cylinder head  1  at a swing angle of 2α. Since the piston  3  swings once around the axis of the center pin  4  relative to the turntable  5 , the V1 working chamber  1001  and the V2 working chamber  1002  undergo a complete intake or compression exhaust process, respectively. 
     A sealing plug  11  is provided at the end of the piston shaft hole  105  on the cylinder head  1 , and an internal thread is provided on the inner hole in the outer end of the piston shaft hole  105 . The sealing plug  11  is provided with an external thread matched with the internal thread, and the sealing plug  11  is arranged at the end of the piston shaft hole  105  by the threads in a blocking mode, so that compression media and lubricating oil cannot leak from the piston shaft hole  105 . 
     In order to improve the manufacturability of the piston  3 , as shown in  FIG. 13 , a piston insert  304  is arranged at the fan-shaped cavity at the opening of the piston  3 . The piston insert  304  is matched with the opening of the piston  3  in size, and the top surface of the piston insert  304  is matched with the top surface of the opening of the piston  3 . The two side faces of the piston insert  304  are matched with the two side faces of the piston  3 . The two end faces of the piston insert  304  are matched with the two side faces of the opening of the piston  3 . The lower end of the piston insert  304  is an arc of the same radius and coaxial with the piston pin hole  302  in the lower end of the piston  3 . By making the top surface and the two end faces of the piston insert  304  and the top surface and the two side faces of the opening of the piston  3  into mutually matched planes, machining is convenient, and the machining precision and the matching precision after assembly are improved. 
     Inspired by this embodiment, those skilled in the art can perform the following deformation treatment on the turntable  5  and the cylinder body  2  without creative labor, and can also achieve the technical effect of the present invention: since the movement of the turntable  5  is rotation around the axis of the turntable shaft hole  201  on the cylinder body  2 , the turntable spherical surface can be deformed into various forms of rotating surfaces around the axis of the turntable shaft hole  201  on the cylinder body  2 , and the rotating surface can be spherical, cylindrical, conical and other forms. The inner spherical surface of the cylinder body  2  is also deformed into a rotating surface matched with the rotating surface of the turntable  5 . The end faces of the two ends of the cylindrical hinge formed by the piston pin boss, the center pin  4  and the turntable pin boss and the inner surface of the cylinder body  2  are attached to each other and form a sealed loose fit during the movement of the piston  3  and the turntable  4 . For this reason, the above-mentioned deformation scheme of the turntable and the cylinder body is also protected by this patent, and any technical scheme adopting the above deformation treatment also falls within the scope of the present application. 
     Example 2 
       FIGS. 14-23  show the illustration of the second embodiment. A center pin  4 , a piston insert  304  and a piston shoe  14  in this embodiment are the structurally same as those in the first embodiment described above. As shown in  FIGS. 14-16 and 20-23 , a spherical compressor in this embodiment includes a cylinder head  1 , a cylinder body  2 , a piston  3 , a center pin  4  and a turntable  5 . The cylinder body  2  and the cylinder head  1  have hemispherical inner cavities, and the cylinder body  2  and the cylinder head  1  are fixedly connected by screws to form a casing of the spherical compressor with a spherical inner cavity. An intake passage  103 , an exhaust passage  104  and a piston shaft hole  105  are provided on the inner spherical surface of the cylinder head  1 . The cylinder body  2  is provided with a turntable shaft hole  201  in communication with the outside of the cylinder body. The turntable shaft hole  201  in the cylinder body  2  communicates with the spherical inner cavity of the cylinder body  2  through a via hole, and the radial dimension of the via hole is smaller than the diameter of the turntable shaft hole  201 . An annular positioning surface is formed at the upper end of the turntable shaft hole  201 . The axis of the piston shaft hole  105  and the axis of the turntable shaft hole  201  both pass through the center of the spherical inner cavity, and the included angle between the axis of the piston shaft hole  105  and the axis of the turntable shaft hole  201  is α. The intake passage  103  and the exhaust passage  104  on the cylinder head  1  are arranged in an annular space perpendicular to the axis of the piston shaft hole  105  on the inner spherical surface, and an intake hole  101  and an exhaust hole  102  are further formed in the outer surface of the cylinder head  1 . The intake hole  101  communicates with the intake passage  103 , and the exhaust hole  102  communicates with the exhaust passage. 
     As shown in  FIGS. 17-19 , the piston  3  has a spherical top surface, two side faces which form an angle and a piston pin boss at the lower part of the two side faces. The spherical top surface of the piston and the spherical inner cavity formed by the cylinder body  2  and the cylinder head  1  have the same center and form a sealed loose fit. The piston pin boss is a semi-cylinder, and a piston pin hole  302  which penetrates is provided on the central axis of the semi-cylinder. The piston pin boss at the lower part of the piston  3  is provided with an opening so as to form a fan-shaped cavity on the piston pin boss of the piston  3 , the opening of the piston  3  is located in the middle of the piston pin boss and perpendicular to the axis of the piston pin hole  302  of the piston pin boss, and the width of the opening of the piston  3  is matched with the width of the semi-cylinder of the turntable pin boss. The turntable  5  has a turntable pin boss corresponding to the piston pin boss, and the turntable pin boss is arranged at the upper part of the turntable  5 . The outer peripheral surface between the upper part and the lower end face of the turntable  5  is a turntable spherical surface, and the turntable spherical surface and the spherical inner cavity have the same center and are closely attached to each other to form a sealed loose fit. The two ends of the turntable pin boss are provided with semi-cylindrical grooves, and the middle part of the turntable pin boss is provided with a protruding semi-cylinder. A turntable pin hole  502  which penetrates is formed in the center of the semi-cylinder. A turntable shaft  501  is provided at the lower end of the turntable  5 , and a turntable shaft pin hole  503  is formed in the turntable shaft  501 . A piston shaft  301  matched with the piston shaft hole  105  in the cylinder head  1  protrudes from the center of the spherical top surface of the piston  3 , and the piston shaft  301  is inserted into the piston shaft hole  105  in the cylinder head  1  to form a rotating pair with the cylinder head  1 . The center pin  4  is inserted into a pin hole formed by matching the turntable pin boss with the piston pin boss to form a cylindrical hinge, and the matching surfaces of the cylindrical hinge form a sealed loose fit. The piston  3  and the turntable  5  form a sealed loose connection through the cylindrical hinge, and the two ends of the cylindrical hinge and the spherical inner cavity form a sealed loose fit. 
     The lower end of the cylinder body  2  is connected to a main shaft  12  through a main shaft support  13 , and the main shaft support  13  is fixedly connected to the lower end of the cylinder body  2  through screws to provide support for the rotation of the main shaft  12 . The upper end of the main shaft  12  is placed in the turntable shaft hole  201 . The outer cylinder at the upper end of the main shaft  12  is coaxial with the turntable shaft hole  201 , and the main shaft  12  can rotate around the turntable shaft hole  201 . A main shaft sliding chute  121  is provided on the upper end face of the main shaft  12  in the direction of the axis of the center pin  4 , and the two side faces of the main shaft sliding chute  121  serve as sliding working surfaces and are symmetrically arranged on both sides of a plane of the axis of the turntable shaft hole  201  in the cylinder body  2  and the axis of the center pin  4 . Similar to the structure of the piston shoe  14  in the first embodiment, a piston shoe shaft hole  141  is provided at the center of the piston shoe  14 . As shown in  FIGS. 10, 15, 16 and 18 , the two side faces of the piston shoe  14  are parallel planes. A turntable shaft pin hole  503  is provided at the end of the turntable shaft  501 , and a piston shoe pin hole  142  is formed in the corresponding position of the piston shoe  14 . After the turntable shaft  501  passes through the via hole through which the turntable shaft hole  201  communicates with the spherical inner cavity, the end of the turntable shaft  501  is inserted into the piston shoe shaft hole  141 . A fixing pin  10  is inserted into a fixing pin hole formed by the turntable shaft pin hole  503  and the piston shoe pin hole  142 , and the piston shoe  14  is fixed to the end of the turntable shaft  501  by the fixing pin  10 . The piston shoe  14  is arranged in the main shaft sliding chute  121  in the end of the main shaft  12 , and the two side faces of the piston shoe  14  are attached to the two side faces of the main shaft sliding chute  121  and slide along the two side faces of the main shaft sliding chute  121  to form a loose fit, and the main shaft sliding chute  121  on the main shaft  12  and the piston shoe  14  on the turntable shaft  501  form a sliding chute swinging mechanism  16 . 
     The lower end of the main shaft  12  extends out of a shaft hole of the main shaft support  13  and is connected to a power mechanism. The main shaft  12  drives the turntable shaft  501  to rotate through the two side faces of the main shaft sliding chute  121 . The turntable  5  drives the piston  3  to move through the cylindrical hinge. The movement of the piston  3  is rotation around the axis of the piston shaft hole  105 . The movement of the turntable  5  is rotation around the axis of the turntable shaft hole  201  and swings around the center pin  4  relative to the piston  3 . Meanwhile, the turntable  5  swings along the two side faces of the main shaft sliding chute  121  through the piston shoe  14  relative to the axis of the turntable shaft hole  201  in the cylinder body  2  at a swing angle of 2α. The length of the two side faces of the main shaft sliding chute  121  in the direction of the axis of the center pin  4  should be long enough to ensure that the swing of the piston shoe  14  is not interfered. In this embodiment, the sliding chute swinging mechanism  16  is used to provide the turntable  5  with a degree of freedom to swing along the two side faces of the main shaft sliding chute  121 . 
     The turntable  5  swings around the center pin  4  relative to the piston  3 , and a V1 working chamber  1001  and a V2 working chamber  1002  with alternatively variable volumes are formed between the upper end face of the turntable  5 , the two side faces of the piston  3  and the spherical inner cavity. The intake passage  103  and the exhaust passage  104  on the cylinder head  1  are arranged in an annular space perpendicular to the axis of the piston shaft hole  105 . The intake passage  103  and the exhaust passage  104  communicate with an intake hole  101  and an exhaust hole  102  in the cylinder head  1  respectively, and the intake hole  101  and the exhaust hole  102  communicate with the outside of the cylinder body  2 . The air intake and discharge control is realized by the rotation of the piston  3 , and when the working chambers need to perform air discharge or air intake, the corresponding working chamber communicates with the intake passage  103  or the exhaust passage  104 . 
     The power mechanism drives the main shaft  12  to rotate, and the main shaft  12  drives the turntable shaft  501  to rotate through the two side faces of the main shaft sliding chute  121 . The volumes of the V1 working chamber  1001  and the V2 working chamber  1002  change constantly. In  FIG. 15 , the V1 working chamber  1001  and the V2 working chamber  1002  are in the ultimate state. The V1 working chamber  1001  is in a state that the air intake of the spherical compressor has completed, so the theoretical volume of the V1 working chamber  1001  in the figure is maximum, and the V2 working chamber  1002  is in a state of starting the air intake of the next cycle after discharging the air, so the theoretical volume of the V2 working chamber  1002  in the figure is zero. Each time the turntable shaft  501  drives the turntable  5  to rotate by one cycle, the piston  3  rotates around the axis of the piston shaft hole  105  by one cycle, and at the same time, the turntable  5  swings once along the two side faces of the main shaft sliding chute  121  relative to the axis of the turntable shaft hole  201  in the cylinder body  2  at a swing angle of 2α. Since the turntable  5  swings once around the axis of the center pin  4  relative to the piston  3 , the V1 working chamber  1001  and the V2 working chamber  1002  undergo a complete intake or compression exhaust process, respectively. 
     A needle bearing is arranged on the portion, matched with the turntable shaft hole  201  on the cylinder body  2 , of the upper cylindrical part of the main shaft  12 . A sealing ring  7  is arranged on the inner side of the portion, engaged with the main shaft support  13 , of the main shaft  12 , and a bearing  8  is arranged at the end of the engagement portion. A piston shaft sleeve  9  is arranged on the portion, matched with the piston shaft hole  105  on the cylinder head  1 , of the piston shaft  301 . 
     As an application extension of this embodiment, the piston shaft hole  105  on the cylinder head  1  communicates with the outside of the cylinder body, and the piston shaft  301  extends out of the piston shaft hole  105  on the cylinder head  1  and is connected to a power mechanism to serve as the power input end of the compressor, or power may be input from the piston shaft. 
     In order to improve the manufacturability of the piston  3 , as shown in  FIG. 14 , a piston insert  304  is arranged at the fan-shaped cavity at the opening of the piston  3 . The piston insert  304  is matched with the opening of the piston  3  in size, and the top surface of the piston insert  304  is matched with the top surface of the opening of the piston  3 . The two side faces of the piston insert  304  are matched with the two side faces of the piston  3 . The two end faces of the piston insert  304  are matched with the two side faces of the opening of the piston  3 . The lower end of the piston insert  304  is an arc of the same radius and coaxial with the piston pin hole  302  in the lower end of the piston  3 . By making the top surface and the two end faces of the piston insert  304  and the top surface and the two side faces of the opening of the piston  3  into mutually matched planes, machining is convenient, and the machining precision and the matching precision after assembly are improved. 
     Inspired by this embodiment, those skilled in the art can perform the following deformation treatment on the piston  3  and the cylinder head  1  without creative labor, and can also achieve the technical effect of the present invention: since the movement of the piston  3  is rotation around the axis of the piston shaft hole  105  on the cylinder head  1 , the spherical top surface of the piston  3  can be deformed into various forms of rotating surfaces around the axis of the piston shaft hole  105  on the cylinder head  1 , and the rotating surface can be spherical, cylindrical, conical and other forms. The inner spherical surface of the cylinder head  1  is also deformed into a rotating surface matched with the rotating surface of the piston  3 . The end faces of the two ends of the cylindrical hinge formed by the piston pin boss, the center pin  4  and the turntable pin boss and the inner spherical surface of the cylinder head  1  are attached to each other and form a sealed loose fit during the movement of the piston  3  and the turntable  4 . For this reason, the above-mentioned deformation scheme of the piston  3  and the cylinder head  1  is also protected by this patent, and any technical scheme adopting the above-mentioned deformation treatment also falls within the scope of protection of the present invention. 
     According to the invention, the sliding chute swinging mechanism  16  is arranged between the piston shaft  301  and the piston shaft hole  105  or between the turntable shaft  501  and the turntable shaft hole  201 . In the first embodiment, the sliding chute swinging mechanism  16  between the piston shaft  301  and the piston shaft hole  105  allows the piston  3  to swing along the two side faces of the rotary sleeve sliding chute  601  relative to the axis of the piston shaft hole  105 , so that the piston  3  obtains a degree of freedom in the direction of the axis of the center pin  4 . In the second embodiment, the sliding chute swinging mechanism  16  between the turntable shaft  501  and the turntable shaft hole  201  allows the turntable  5  to swing along the two side faces of the main shaft sliding chute  121  relative to the axis of the turntable shaft hole  201 , so that the turntable  5  obtains a degree of freedom in the direction of the axis of the center pin  4 .