Annularly-arranged expansion machine

Abstract

The invention relates to the technical field of expansion machines and discloses an annularly-arranged expansion machine which comprises a machine body, an output shaft, a piston and an air distribution mechanism used for air inlet and exhaust, the output shaft is rotationally arranged in the machine body, a plurality of air cylinders are arranged in the machine body, the axes of the air cylinders are parallel to the axis of the output shaft, and the air cylinders are evenly distributed around the output shaft. The piston is axially and slidably arranged in the cylinder, a rotating disc with a rotating surface being an inclined surface or a wavy surface is fixedly arranged at the position, corresponding to the cylinder, of the output shaft, a notch in sliding fit with the rotating disc is formed in the middle of the piston, the valve mechanism is arranged at the axial end of the cylinder, and an air inlet channel and an exhaust channel of the valve mechanism are both communicated with the end of the cylinder; the annularly-arranged expansion machine is high in structural compactness, the occupied space is effectively reduced, meanwhile, the output power of equipment can be improved through movement of the multiple pistons, a crank-link mechanism is replaced with the rotary disc, and the problems of dead points and noise existing in the crank-link mechanism are fundamentally solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of expansion machines, in particular to a ring-arranged expansion machine. BACKGROUND

[0002] A conventional piston expansion machine is composed of a cylinder, a piston, an intake valve, an exhaust valve, a crankshaft, a connecting rod, a flywheel and other components. The piston completes four strokes in the movement: an intake stroke, an expansion stroke, an exhaust stroke and a compression stroke.

[0003] The working principle of the conventional piston expansion machine is as follows: in the intake stroke, the piston moves from the top dead center to the bottom dead center, the intake valve is opened, and the high-pressure gas flows into the cylinder under the action of pressure, and the pressure in the cylinder is basically maintained at the intake pressure; in the expansion stroke, when the piston approaches the bottom dead center, the intake valve is closed, the high-pressure gas starts to expand adiabically, and the pressure generated by the expansion of the gas pushes the piston to move downward, and as the gas expands, its pressure decreases and the temperature significantly decreases, and the internal energy decreases; in the exhaust stroke, the exhaust valve is opened, and the piston moves from the bottom dead center to the top dead center, and the low-pressure gas after expansion is pushed upward by the piston and discharged from the cylinder; in the compression stroke, when the piston approaches the top dead center, the exhaust valve is closed, and the piston continues to move to the top dead center, and the low-pressure gas remaining in the cylinder is compressed by the piston, and when the piston reaches the vicinity of the top dead center, the pressure in the cylinder rises to close to the intake pressure.

[0004] In some fields using piston expansion machines, in order to improve the output power, it is often necessary to set multiple parallel cylinders to cooperate, but multiple parallel cylinders will cause the problem of excessive volume of the overall engine.

[0005] Therefore, people urgently need a ring-arranged piston expansion machine with small space occupation and high output power. SUMMARY

[0006] The purpose of the present application is to provide a ring-arranged expansion machine to solve the problems existing in the prior art, integrate several cylinders, effectively reduce the space occupation, and the movement of multiple pistons can improve the output power of the equipment.

[0007] To achieve the above objectives, the present invention provides the following solution: The present invention provides a ring-shaped expander, including a body, an output shaft, a piston, and a valve distribution mechanism for intake and exhaust. The output shaft is rotatably disposed in the body, and a plurality of cylinders are disposed in the body. The axis of the cylinders is parallel to the axis of the output shaft, and the plurality of cylinders are evenly distributed around the output shaft. The piston is axially slidably disposed in the cylinder. A turntable with a sloping or wavy surface is fixedly disposed on the output shaft corresponding to the position of the cylinder. A notch with a sliding fit with the turntable is opened in the middle of the piston. The valve distribution mechanism is disposed at the axial end of the cylinder, and the intake and exhaust passages of the valve distribution mechanism are connected to the end of the cylinder.

[0008] Preferably, the piston has a notch located on the wall surface on both sides of the turntable, and rollers are provided thereon, so that the piston can slide with the turntable via the rollers.

[0009] Preferably, the piston notch is provided with sliding blocks on the walls on both sides of the turntable, and sliding grooves are provided on the walls on both sides of the turntable, with the sliding blocks slidably disposed in the sliding grooves.

[0010] Preferably, the valve distribution mechanism is provided at both ends of the cylinder along its axial direction.

[0011] Preferably, the valve train includes a cylinder head for fastening to the axial end of the cylinder, a plurality of valve train assemblies, and a double overhead disc cam. The valve train assemblies are arranged corresponding to the cylinder and include an intake manifold, an exhaust manifold, an intake valve assembly, and an exhaust valve assembly. The radius of the second protrusion of the double overhead disc cam is smaller than the radius of the first protrusion, and the second protrusion is offset from the first protrusion. The intake manifold and the exhaust manifold are both located inside the cylinder head. The intake valve assembly and the exhaust valve assembly each include a valve and a return spring. The valve head of the valve is located at the outlet of the intake manifold or the inlet of the exhaust manifold. The valve stem of the valve passes through the cylinder head and extends outward to form a control end. A roller bracket is provided at the end of the control end, and the return spring is provided between the roller bracket and the cylinder head. The plurality of exhaust valve assemblies are arranged corresponding to the first protrusion or the second protrusion, and the plurality of intake valve assemblies are arranged corresponding to the second protrusion or the first protrusion. The double overhead disc cam is connected to the drive structure for transmission.

[0012] Preferably, the roller frame is provided with a rolling element that rolls in cooperation with the first protrusion or the second protrusion.

[0013] Preferably, a plurality of the intake ducts are integrated into a first annular air chamber, and a plurality of the exhaust ducts are integrated into a second annular air chamber, wherein the first annular air chamber is located on the inner or outer periphery of the second annular air chamber.

[0014] Preferably, the machine body includes a first mounting body and a second mounting body arranged along the axial direction of the cylinder. The first mounting body, the second mounting body, and the valve train are detachably connected. Both the first mounting body and the second mounting body are provided with a central through hole and a plurality of mounting through holes. The plurality of mounting through holes are evenly distributed around the central through hole. The central through holes of the first mounting body and the second mounting body are spliced ​​to form an output shaft mounting hole. The mounting through holes of the first mounting body and the second mounting body are spliced ​​to form the cylinder. The first mounting body and / or the second mounting body are provided with a clearance groove for avoiding the turntable.

[0015] Preferably, the body includes at least two modular bodies arranged circumferentially along the output shaft, adjacent modular bodies are detachably connected, the cylinder is provided on the modular body, and the modular body is provided with an arc-shaped groove for splicing to form an output shaft mounting hole.

[0016] Preferably, the inner wall of the cylinder is provided with a strip-shaped limiting groove along the axial direction of the cylinder, and a limiting block is provided on the piston, the limiting block being slidably disposed in the limiting groove along the axial direction of the cylinder.

[0017] The present invention achieves the following main technical effects compared to the prior art:

[0018] The single unit contains several pistons capable of performing work, essentially integrating several cylinders into one. A turntable on the output shaft drives the pistons within these cylinders to move. The turntable's structural design ensures the linkage between pistons in different cylinders, resulting in a highly compact structure that effectively reduces space occupation. Simultaneously, the movement of multiple pistons increases the equipment's output power. The use of a turntable replaces the crank-connecting rod mechanism, fundamentally solving the dead point and noise problems inherent in the crank-connecting rod mechanism. It also reduces the processing difficulty of the output shaft. Furthermore, the overall horizontal structure design makes the equipment more stable during operation and facilitates maintenance and operation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the annularly arranged expander in an embodiment of the present invention;

[0021] Figure 2This is a schematic diagram of the external structure of the annular expander in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the first mounting body and the second mounting body in an embodiment of the present invention;

[0023] Figure 4 This is an assembly diagram of two module bodies (four cylinders) in an embodiment of the present invention;

[0024] Figure 5 This is an assembly diagram of the three-module body (three cylinders) in an embodiment of the present invention;

[0025] Figure 6 This is an assembly diagram of the six-module body (three cylinders) in an embodiment of the present invention;

[0026] Figure 7 This is an assembly diagram of the four modular bodies (four cylinders) in an embodiment of the present invention;

[0027] Figure 8 This is an assembly diagram of the five-module body (five cylinders) in an embodiment of the present invention;

[0028] Figure 9 This is an assembly diagram of the six-module body (six cylinders) in an embodiment of the present invention;

[0029] Figure 10 This is a schematic diagram of the assembly of the piston, turntable, output shaft and double overhead disc cam in an embodiment of the present invention;

[0030] Figure 11 This is a schematic diagram of the first structure of the turntable in an embodiment of the present invention;

[0031] Figure 12 This is a schematic diagram of a second structure of the turntable in an embodiment of the present invention;

[0032] Figure 13 This is a schematic diagram of a third structure of the turntable in an embodiment of the present invention;

[0033] Figure 14 This is a schematic diagram of the fourth structure of the turntable in an embodiment of the present invention;

[0034] Figure 15 This is a schematic diagram of the fifth structure of the turntable in an embodiment of the present invention;

[0035] Figure 16 This is a schematic diagram of the structure of the double-overhead disc cam in an embodiment of the present invention;

[0036] Figure 17 This is a schematic diagram of the piston structure in an embodiment of the present invention;

[0037] Figure 18 This is a schematic diagram of the cylinder head structure in an embodiment of the present invention;

[0038] Figure 19 This is a schematic diagram of the structure of the first annular air chamber and the second annular air chamber inside the cylinder head in an embodiment of the present invention;

[0039] Figure 20 This is a schematic diagram of the intake valve assembly and exhaust valve assembly in an embodiment of the present invention;

[0040] The components are as follows: 1. Body; 2. Output shaft; 3. Piston; 4. Valve distribution mechanism; 5. Turntable; 6. Notch; 7. Thrust bearing; 8. Rolling bearing; 9. Locking nut; 10. Hemisphere; 11. Sliding groove; 12. Cylinder head; 13. Double overhead disc cam; 14. First protrusion; 15. Second protrusion; 16. Valve stem; 17. Valve head; 18. Roller frame; 19. Return spring; 20. Rolling element; 21. First annular air chamber; 22. Second annular air chamber; 23. First mounting body; 24. Second mounting body; 25. Central through hole; 26. Mounting through hole; 27. Modular body; 28. Arc groove; 29. ​​End cover; 30. Limiting groove; 31. Limiting block; 32. Cylinder; 33. Annular retaining ring. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] The purpose of this invention is to provide a ring-shaped expander to solve the problems existing in the prior art. It integrates several cylinders, effectively reducing space occupation, and the movement of multiple pistons can improve the output power of the equipment.

[0043] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Please refer to the following: Figures 1-20As shown, a ring-shaped expander is provided, including a body 1, an output shaft 2, a piston 3, and a valve distribution mechanism 4 for intake and exhaust. The output shaft 2 is rotatably mounted in the body 1, and a plurality of cylinders 32 are arranged in the body 1. The axes of the cylinders 32 are parallel to the axis of the output shaft 2, and the plurality of cylinders 32 are evenly distributed around the output shaft 2. The piston 3 is axially slidably mounted in the cylinders 32. A turntable 5 with a rotating surface that is inclined or wavy is fixedly mounted on the output shaft 2 at the position corresponding to the position of the cylinders 32. That is, the turntable 5 is an inclined plate or a wavy plate. The wave plate includes multiple crests and troughs. The piston 3 has a notch 6 in the middle that slides with the turntable 5. The valve train 4 is located at the axial end of the cylinder 32. The intake and exhaust passages of the valve train 4 are connected to the end of the cylinder 32. The structural design of the rotating surface of the turntable 5 can ensure the linkage of the pistons 3 in different cylinders 32 (the strokes in several cylinders 32 are not synchronized, so that the movement generated when one cylinder 32 performs the expansion stroke drives the other cylinders 32 to perform the intake stroke, exhaust stroke and compression stroke).

[0045] When the turntable 5 is an inclined plate, it is necessary to design the wall surface of the notch 6 to fit with the two ends of the inclined plate, or to embed a hemisphere 10 in the wall surface of the notch 6, with the plane of the hemisphere 10 fitting with the two ends of the inclined plate. The hemisphere 10 can be movably set in the wall surface of the notch 6 so as to move freely and maintain the fitting state with the inclined plate.

[0046] The output shaft 2 and the machine body 1 are connected by a thrust bearing 7 and a rolling bearing 8, which can withstand large radial and axial loads, reduce the radial and axial forces of the main shaft, and achieve axial positioning by a locking nut 9, ensuring the stability and reliability of the equipment when it is running at high speed.

[0047] Rollers can be installed on the walls of the piston 3 at the notch 6 on both sides of the turntable 5. The piston 3 slides with the turntable 5 through the rollers, which can reduce the friction between the piston 3 and the turntable 5 and increase the service life of the equipment. The rollers are specifically set as follows: a groove is set on the wall of the notch 6 for embedding the rollers. The rollers are fixed in the grooves by pins. The pin hole extends from the side of the piston 3 away from the notch 6 to the inner wall of the groove near the output shaft 2. A stop block needs to be set at the pin hole on the side of the piston 3 away from the notch 6 to prevent the pin from coming out, or the pin can be replaced with a bolt and the pin hole can be replaced with a threaded hole. The position of the bolt corresponding to the roller is a smooth surface. In this case, the position of the bolt is fixed by a threaded connection.

[0048] Sliding blocks can be provided on the walls on both sides of the notch 6 of the piston 3 located on the turntable 5. Sliding grooves 11 are provided on the walls on both sides of the turntable 5. The sliding blocks are slidably disposed in the sliding grooves 11 to realize the motion guidance between the piston 3 and the turntable 5 and improve the motion accuracy. Moreover, based on the setting of rollers, the rollers can be used as sliding blocks.

[0049] When the valve train 4 is installed only at one axial end of the cylinder 32, an air port needs to be installed at the other end to prevent high pressure or negative pressure from being generated when the piston 3 moves, thus blocking the normal movement of the piston 3.

[0050] In this embodiment, a valve distribution mechanism 4 is provided at both ends of the cylinder 32 along the axial direction. That is, in this embodiment, the cylinders 32 appear in pairs and are arranged opposite each other, and the paired cylinders 32 share a common piston 3.

[0051] The valve train 4 in this embodiment is specially designed, specifically including a cylinder head 12 for fastening to the axial end of the cylinder 32, several valve train assemblies, and a double overhead disc cam 13. The valve train assemblies are arranged corresponding to the cylinder 32 and include an intake manifold, an exhaust manifold, an intake valve assembly, and an exhaust valve assembly. The radius of the second protrusion 15 of the double overhead disc cam 13 is smaller than the radius of the first protrusion 14, and the second protrusion 15 is offset from the first protrusion 14. Both the intake manifold and the exhaust manifold are located inside the cylinder head 12. The intake manifold has an outlet corresponding to the position of the cylinder 32, and the exhaust manifold has an inlet corresponding to the position of the cylinder 32. Both the intake valve assembly and the exhaust valve assembly include a valve and a return spring 19. The valve includes a valve stem 16 and a valve head 17 at the end of the valve body for sealing. Located at the air outlet of the intake manifold or the air inlet of the exhaust manifold, one end of the valve stem 16 is connected to the valve head 17, and the other end passes through the cylinder head 12 and extends outward to form a control end. A roller frame 18 is provided at the end of the control end, and a return spring 19 is provided between the roller frame 18 and the cylinder head 12. Several exhaust valve groups are provided corresponding to the first protrusion 14, and several intake valve groups are provided corresponding to the second protrusion 15. The double overhead disc cam 13 is connected to the drive structure for transmission. When the double overhead disc cam 13 rotates, the first protrusion 14 and the second protrusion 15 intermittently squeeze the roller frame 18, thereby matching the intake or exhaust of the cylinder 32. When the first protrusion 14 and the second protrusion 15 no longer squeeze the roller frame 18, the valve stem 16 returns to its original position under the action of the return spring 19, blocking the air outlet of the intake manifold or the air inlet of the exhaust manifold.

[0052] The intake valve assembly and the exhaust valve assembly are interchangeable, that is, the intake valve assembly is set to the first protrusion 14, and the exhaust valve assembly is set to the second protrusion 15.

[0053] An annular retaining ring 33 is fixedly provided on the cylinder head 12. The annular retaining ring 33 has a through hole that matches the position of the roller frame 18. The roller frame 18 is slidably disposed in the through hole. The through hole of the annular retaining ring 33 can limit the roller frame 18 and prevent it from moving along the movement path of the first protrusion 14 or the second protrusion 15 due to friction.

[0054] In this embodiment, the double-topped disc cam 13 is coaxially arranged with the output shaft 2 and is connected to the output shaft 2 for transmission. The rotation of the output shaft 2 drives the double-topped disc cam 13 to rotate, saving the need for other drive structures.

[0055] The roller frame 18 is provided with a rolling element 20 that rolls with the first protrusion 14 or the second protrusion 15, so that the friction between the control end and the first protrusion 1416 or the second protrusion 1517 is changed from sliding friction to rolling friction.

[0056] The structural strength of the connection can be improved by thickening the connection between the roller frame 18 and the valve stem 16, preventing the connection from breaking due to the shearing force from the double-topped disc cam 13, thus affecting the service life.

[0057] Several air intakes can be integrated into a first annular air chamber 21, and several exhausts can be integrated into a second annular air chamber 22, simplifying the structural design and reducing costs. The integrated first annular air chamber 21 is located on the inner or outer circumference of the integrated second annular air chamber 22.

[0058] The design of the first body can be mainly divided into two types:

[0059] The first type: The body 1 includes a first mounting body 23 and a second mounting body 24 arranged along the axial direction of the cylinder 32. The first mounting body 23, the second mounting body 24 and the valve train 4 are detachably connected and can be detached by using transverse tension bolts. Both the first mounting body 23 and the second mounting body 24 are provided with a central through hole 25 and several mounting through holes 26. The several mounting through holes 26 are evenly distributed around the central through hole 25. The central through holes 25 of the first mounting body 23 and the second mounting body 24 are spliced ​​to form an output shaft mounting hole for mounting the output shaft 2. The mounting through holes 26 of the first mounting body 23 and the second mounting body 24 are spliced ​​to form the cylinder 32. The first mounting body 23 and / or the second mounting body 24 are provided with a clearance groove for avoiding the turntable 5. This design makes the assembly of the body 1 more convenient. At the same time, the first mounting body 23 and the second mounting body 24 adopt a half structure docking, which can reduce the tangential force generated by mechanical vibration.

[0060] The second type: The body 1 includes at least two modular bodies 27 arranged circumferentially along the output shaft 2. Adjacent modular bodies 27 are detachably connected and can be detached through a flange structure. A cylinder 32 is provided on the modular body 27. The cylinder 32 can be selected and set on a suitable modular body 27 according to the actual number of modules and the number of cylinders 32. The modular body 27 is provided with an arc-shaped groove 28 for splicing to form the output shaft mounting hole. The arc-shaped grooves 28 of all modular bodies 27 are spliced ​​together to form the output shaft mounting hole. The modular design allows for the replacement of damaged modules during the maintenance of the body 1, while the remaining undamaged modules do not need to be replaced, saving maintenance costs. At the same time, the cylinder 32 is machined through the shaft, which makes the piston 3 move smoothly in a straight line. Moreover, the modular design facilitates assembly line processing and reduces processing costs. The assembly of the flange can also improve assembly efficiency.

[0061] The body 1 also includes end caps 29 on both sides for engaging the gas distribution mechanism 4 and providing a protective function.

[0062] The inner wall of cylinder 32 is provided with a strip-shaped limiting groove 30 along the axial direction of cylinder 32. A limiting block 31 is provided on piston 3. The limiting block 31 is slidably disposed in the limiting groove 30 along the axial direction of cylinder 32. When piston 3 and turntable 5 cooperate and move, piston 3 will be subjected to a force that causes it to twist. At this time, since the limiting block 31 is located in the limiting groove 30 on the inner wall of cylinder 32, the limiting groove 30 will prevent piston 3 from twisting through the limiting block 31, which can ensure the normal operation of the equipment and improve the service life of the equipment.

[0063] A corresponding lubricating oil supply system can be set up to supply oil to the mating points of the turntable 5 and piston 3, and the mating points of the double-topped disc cam 13 and the air valve. Since the turntable 5 and the double-topped disc cam 13 are both located on the output shaft 2, a hollow oil passage can be set up inside the output shaft 2. An annular groove is set on the outer periphery of the output shaft 2, and an annular space is formed between the annular groove and the machine body 1. This annular space is connected to the oil inlet of the oil supply system, so that lubricating oil can enter the output shaft 2. At the same time, a lubricating oil passage is set up inside the turntable 5 and the double-topped disc cam 13 and connected to the hollow oil passage. The oil outlet of the lubricating oil passage is set to correspond to the notch 6 of the piston 3 and the roller frame 18 on the air valve, thereby realizing the lubrication of the mating points of the turntable 5 and piston 3 and the mating points of the double-topped disc cam 13 and the air valve. At this time, a return oil passage needs to be set up at the bottom of the mating cavity of the turntable 5 and piston 3 and the bottom of the mating cavity of the double-topped disc cam 13 and the air valve to allow the lubricating oil to return to the oil tank.

[0064] In actual use, the double overhead disc cam 13 drives the valve train to work, realizing the intake or exhaust of the cylinder 32, and thus realizing the movement of the piston 3 in the cylinder 32. The movement of the piston 3 is converted into the rotation of the output shaft 2 through the turntable 5, realizing the conversion of the internal energy of the gas into mechanical energy, thereby achieving the cooling of the gas.

[0065] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0066] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0067] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A ring-shaped expander, characterized in that, The device includes a body, an output shaft, a piston, and a valve train for intake and exhaust. The output shaft is rotatably mounted in the body, which contains a plurality of cylinders. The axes of the cylinders are parallel to the axis of the output shaft, and the cylinders are evenly distributed around the output shaft. The piston is axially slidably mounted in the cylinder. A turntable with a sloping or wavy surface is fixedly mounted on the output shaft at the position corresponding to the cylinder. A notch is provided in the middle of the piston to slide with the turntable. The valve train is located at the axial end of the cylinder, and the intake and exhaust passages of the valve train are connected to the end of the cylinder.

2. The annular expansion machine according to claim 1, characterized in that, The piston has a notch located on the walls on both sides of the turntable, where rollers are provided, and the piston slides on the turntable via the rollers.

3. The annular expansion machine according to claim 1, characterized in that, The piston has a notch located on the walls on both sides of the turntable, and sliding blocks are provided thereon. Sliding grooves are provided on the walls on both sides of the turntable, and the sliding blocks are slidably disposed in the sliding grooves.

4. The annular expansion machine according to claim 1, characterized in that, The cylinder is equipped with the valve distribution mechanism at both ends of its axial direction.

5. The annular expansion machine according to claim 1, characterized in that, The valve train includes a cylinder head for fastening to the axial end of the cylinder, several valve train assemblies, and a double overhead disc cam. Each valve train assembly corresponds to a cylinder and includes an intake manifold, an exhaust manifold, an intake valve assembly, and an exhaust valve assembly. The radius of the second protrusion of the double overhead disc cam is smaller than the radius of the first protrusion, and the second protrusion is offset from the first protrusion. Both the intake manifold and the exhaust manifold are located within the cylinder head. Both the intake valve assembly and the exhaust valve assembly include a valve and a return spring. The valve head of the valve is located at the outlet of the intake manifold or the inlet of the exhaust manifold. The valve stem of the valve passes through the cylinder head and extends outward to form a control end. A roller bracket is provided at the end of the control end, and the return spring is provided between the roller bracket and the cylinder head. Several exhaust valve assemblies are arranged corresponding to the first or second protrusion, and several intake valve assemblies are arranged corresponding to the second or first protrusion. The double overhead disc cam is connected to a drive structure.

6. The annular expansion machine according to claim 5, characterized in that, The roller frame is provided with a rolling element that rolls in cooperation with the first protrusion or the second protrusion.

7. The annular expansion machine according to claim 5, characterized in that, Several of the aforementioned air intakes are integrated into a first annular air chamber, and several of the aforementioned exhausts are integrated into a second annular air chamber, wherein the first annular air chamber is located on the inner or outer periphery of the second annular air chamber.

8. The annular expansion machine according to claim 1, characterized in that, The machine body includes a first mounting body and a second mounting body arranged along the axial direction of the cylinder. The first mounting body, the second mounting body, and the valve train are detachably connected. Both the first mounting body and the second mounting body are provided with a central through hole and a plurality of mounting through holes. The plurality of mounting through holes are evenly distributed around the central through hole. The central through holes of the first mounting body and the second mounting body are spliced ​​together to form an output shaft mounting hole. The mounting through holes of the first mounting body and the second mounting body are spliced ​​together to form the cylinder. The first mounting body and / or the second mounting body are provided with a clearance groove for avoiding the turntable.

9. The annular expansion machine according to claim 1, characterized in that, The machine body includes at least two modular machine bodies arranged circumferentially along the output shaft. Adjacent modular machine bodies are detachably connected. The cylinder is provided on the modular machine body, and the modular machine body is provided with an arc-shaped groove for splicing to form an output shaft mounting hole.

10. The annular expansion machine according to claim 1, characterized in that, The inner wall of the cylinder is provided with a strip-shaped limiting groove along the axial direction of the cylinder, and a limiting block is provided on the piston. The limiting block is slidably disposed in the limiting groove along the axial direction of the cylinder.

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