Valve assembly structure for compressor

Abstract

This invention discloses a valve assembly structure for a compressor, aiming to address the shortcomings of screw-fastened compressor valve assembly sealing structures, where the screw preload gradually decreases after prolonged operation, leading to valve assembly seal failure. The invention includes a crankcase cylinder block and a cylinder head. The cylinder head is fitted onto the crankcase cylinder block, and a valve assembly unit is installed inside the cylinder head. A preload bracket is connected to the crankcase cylinder block, and a disc spring is installed between the preload bracket and the cylinder head. The disc spring provides preload force to the cylinder head, ensuring the valve assembly unit is sealed between the cylinder head and the crankcase cylinder block. The valve assembly structure of this compressor provides a uniformly distributed circumferential preload force to the valve assembly unit, ensuring sealing performance. The preload force of the disc spring is evenly released on the cylinder head, exerting no tangential pressure on the cylinder bore, thus avoiding the problem of cylinder bore deformation caused by tangential pressure.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more specifically, to a valve assembly structure for a compressor. Background Technology

[0002] Fully enclosed refrigeration compressors are widely used in various refrigeration equipment. During operation, refrigerant needs to pass through valve assemblies to enter and exit the compression components to achieve efficient and stable intake and exhaust. During compressor operation, the valve assembly is secured by the preload of fasteners, and the crankshaft rotation drives the piston reciprocating. However, existing valve assembly seals often use screw-fastening structures. For example, Chinese patent application number 200610092497X discloses a compressor valve plate assembly fixed between the compressor cover and the compressor body, with a gasket bearing the clamping force located at the center of the first and second valve plates. The compressor cover and compressor body are fastened with multiple screws. This screw-and-gasket preload method typically requires multiple screws to be tightened simultaneously to achieve the same torque value. If the tightening forces are not simultaneous or the final torque values ​​are inconsistent, it can cause deformation of the crankcase cylinder bore, affecting the piston's reciprocating motion, increasing the compressor's input power, and as operating time increases, the screw preload gradually decreases, even exceeding the lower limit of the acceptable preload, leading to valve assembly seal failure and other adverse consequences. Summary of the Invention

[0003] To overcome the above shortcomings, the present invention provides a valve assembly structure for a compressor, wherein the preload force on the valve assembly is evenly distributed circumferentially, ensuring sealing performance; the preload force is evenly released on the cylinder head, without tangential pressure on the cylinder bore, thus avoiding the problem of cylinder bore deformation caused by tangential pressure.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a valve group structure for a compressor, including a crankcase cylinder block and a cylinder head, the cylinder head covering the crankcase cylinder block, a valve group unit installed inside the cylinder head, a preload bracket connected to the crankcase cylinder block, a butterfly spring installed between the preload bracket and the cylinder head, the butterfly spring providing preload force to the cylinder head to seal the valve group unit between the cylinder head and the crankcase cylinder block.

[0005] During the operation of a refrigeration compressor, the piston reciprocates continuously, drawing in and expelling air. The exhaust phase exerts a significant impact force on the valve assembly, necessitating a fixed sealing structure to counteract this force. The disc spring used is a special type of spring that is axially conical and bears the load. After being subjected to the load deformation caused by the preload bracket, it stores a certain amount of potential energy and releases some of this energy based on the impact force on the valve assembly to maintain the pressure between the valve assemblies to meet sealing requirements. The stress distribution of the disc spring decreases uniformly from the inside out, achieving a low-stroke, high-compensation-force effect. The preload on the valve assembly is evenly distributed circumferentially, ensuring sealing performance. The additional compressive load released by the disc spring is evenly distributed on the cylinder head, without tangential pressure on the cylinder bore, thus avoiding the problem of cylinder bore deformation caused by tangential pressure.

[0006] Preferably, the valve assembly unit includes a valve plate, an intake valve plate, and an exhaust valve plate. The valve plate is provided with an intake hole and an exhaust hole. The intake valve plate and the exhaust valve plate cover the opening ends of the intake hole and the exhaust hole, respectively. The intake valve plate and the exhaust valve plate are respectively placed on both sides of the valve plate.

[0007] When the compressor is running, the crankshaft rotates, driving the piston to reciprocate. When the piston moves backward, it creates a negative pressure in the chamber, opening the suction valve. The refrigerant enters the compression chamber through the suction muffler and valve plate, and then the suction valve closes. The piston moves forward, compressing the refrigerant, which heats up and pressurizes. When the piston moves forward and approaches the suction valve, the exhaust valve opens, and the compressed high-temperature, high-pressure refrigerant enters the exhaust system through the cylinder head. This cycle repeats, achieving stable and efficient suction and exhaust operation of the compressor.

[0008] Preferably, an intake chamber and an exhaust chamber are provided inside the cylinder head, with the intake chamber and exhaust chamber corresponding to the intake port and exhaust port, respectively, and an intake port and an exhaust port are provided on the outer wall of the cylinder head.

[0009] During inhalation, the airflow enters the compression chamber from the intake port through the intake chamber. During exhaust, the airflow passes through the exhaust port and the exhaust chamber before being discharged outwards through the exhaust port.

[0010] Preferably, the valve assembly unit further includes a first gasket and a second gasket. The first gasket is installed between the valve plate and the cylinder head, and the second gasket is installed between the intake valve plate and the crankcase cylinder block. The first gasket is provided with an intake window and an exhaust window, which are respectively provided with the intake port and the exhaust port. The exhaust valve plate is located at the exhaust window position.

[0011] The placement of the first and second gaskets helps improve the sealing performance of the valve assembly unit.

[0012] Preferably, a positioning groove is provided on the side wall of the valve group unit, and a positioning rib is provided on the inner wall of the cylinder head, with the positioning groove and the positioning rib being slidably inserted and connected.

[0013] When assembling the valve assembly unit with the cylinder head, precise positioning is achieved through the matching of positioning grooves and positioning ribs, preventing circumferential rotation between the valve assembly unit and the cylinder head.

[0014] Preferably, a connecting ring is provided on the end face of the crankcase cylinder block, and an installation groove is provided on the outer wall of the connecting ring. The cylinder head is fitted and inserted into the connecting ring, and the positioning rib is inserted and connected to the installation groove.

[0015] The cylinder head and the connecting ring on the crankcase cylinder block are fitted together, and the positioning rib on the cylinder head is fitted into the mounting groove on the outer wall of the connecting ring, ensuring a reliable connection between the cylinder head and the crankcase cylinder block.

[0016] In the first scheme, several claws are evenly distributed around the pre-tensioning frame, and the claws are provided with locking holes. A locking connector is provided on the outer wall of the crankcase cylinder body, and the locking holes and locking connectors are locked together.

[0017] The preload bracket is connected to the crankcase cylinder block via the locking holes on the jaws, ensuring a convenient and reliable connection. After the valve assembly unit is assembled and tested online, if the sealing performance of the valve assembly unit is found to be poor, the jaws can be removed to release the preload force on the valve assembly unit. The valve assembly unit components or disc springs can be replaced, and the unit can be reassembled and tested again until the set requirements are met.

[0018] The second option is to snap the card hole and the card connector together, and then weld the card connector and the card claw together.

[0019] After the valve assembly unit is assembled and tested online, once the parameters meet the set requirements, the clamping connector and clamping claw are welded together, thus achieving a fixed connection between the preload bracket and the crankcase cylinder block. This ensures that the preload bracket provides reliable preload force to the cylinder head when the valve assembly structure for the compressor is running in a closed cavity, preventing connection failure between the preload bracket and the crankcase cylinder block.

[0020] The third option involves a preload bracket with several circumferentially distributed jaws, each with a locking hole. An adjusting ring is threaded onto the outer wall of the crankcase cylinder body, and a locking connector is mounted on the adjusting ring. The locking holes and locking connectors are then engaged. After the adjusting ring rotates to its position, it is welded to the outer wall of the crankcase cylinder body, and the locking connectors are welded to the jaws.

[0021] After the valve assembly unit is assembled and put into trial operation, if poor sealing performance is found, it may be due to insufficient preload. In this case, first rotate the adjusting ring to move it away from the cylinder head by a certain distance, thereby increasing the preload on the cylinder head. Then, conduct another trial operation. After the trial operation meets the requirements, weld the adjusting ring to the outer wall of the crankcase cylinder block and weld the clamping joint to the clamping claw, thus achieving a fixed connection between the preload bracket and the crankcase cylinder block. This ensures that the preload bracket provides reliable preload to the cylinder head when the valve assembly structure of the compressor is running in a closed cavity, preventing connection failure between the preload bracket and the crankcase cylinder block.

[0022] The fourth option involves a preload bracket with several pawls evenly distributed around its circumference, each pawl having a long, narrow ratchet tooth. The crankcase cylinder block has fastening holes, and the ratchet teeth are installed inside these holes. The pawls are movably inserted into the fastening holes, with the ratchet teeth resting between two adjacent ratchet teeth. After the preload bracket is in place, the pawls are welded to the crankcase cylinder block.

[0023] After the valve assembly unit is assembled, the pawl rests between two adjacent ratchet teeth to prevent the pawl from disengaging from the fastening hole, ensuring a reliable connection of the preload bracket. During the initial testing after assembly, if poor sealing performance is found, it may be due to insufficient preload. In this case, the preload bracket is further moved towards the crankcase cylinder block, causing the pawl to slide over the ratchet teeth and lock in place. This increases the preload force of the disc spring on the cylinder head. The unit is then tested again. Once the test meets the requirements, the pawl is welded to the fastening hole on the crankcase cylinder block, thus securing the preload bracket to the crankcase cylinder block. This ensures that the preload bracket provides reliable preload force to the cylinder head when the compressor valve assembly structure is operating within a closed cavity, preventing connection failure between the preload bracket and the crankcase cylinder block.

[0024] Compared with the prior art, the beneficial effects of the present invention are: (1) The preload force of the valve group unit of the compressor valve group structure is evenly distributed in the circumferential direction, which ensures the sealing performance; the preload force of the butterfly spring is evenly released on the cylinder head, and there is no tangential pressure on the cylinder bore, thus avoiding the problem of cylinder bore deformation caused by tangential pressure; (2) When the valve group unit is assembled with the cylinder head, the precise positioning is achieved by the matching of the positioning groove and the positioning rib, thus avoiding circumferential rotation between the valve group unit and the cylinder head; (3) After the valve group unit is assembled, the preload force on the cylinder head can be directly adjusted during the online test. After the test meets the requirements, the preload frame is welded and fixed to the crankcase cylinder body to ensure that the preload frame provides reliable preload force to the cylinder head when the compressor valve group structure is running in the closed cavity, thus preventing the connection between the preload frame and the crankcase cylinder body from failing. Attached Figure Description

[0025] Figure 1 This is a structural diagram of Embodiment 1 of the present invention.

[0026] Figure 2 This is an exploded view of Embodiment 1 of the present invention.

[0027] Figure 3 This is a cross-sectional view of Embodiment 1 of the present invention.

[0028] Figure 4 This is a structural diagram of the cylinder head of the present invention.

[0029] Figure 5 This is a cross-sectional view of Embodiment 3 of the present invention.

[0030] Figure 6 This is a cross-sectional view of Embodiment 4 of the present invention.

[0031] In the diagram: 1. Crankcase cylinder block, 2. Cylinder head, 3. Valve assembly unit, 4. Valve plate, 5. Intake valve plate, 6. Exhaust valve plate, 7. Intake port, 8. Exhaust port, 9. Valve plate body, 10. Valve plate seat, 11. Vent groove, 12. First gasket, 13. Second gasket, 14. Intake window, 15. Exhaust window, 16. Intake chamber, 17. Exhaust chamber, 18. Intake port, 19. Exhaust port, 20. Intake nozzle, 21. Preload bracket, 22. Disc spring, 23. Positioning groove, 24. Positioning rib, 25. Connecting ring, 26. Mounting groove, 27. Claw, 28. Claw hole, 29. Claw connector, 30. Adjusting ring, 31. Racket, 32. Fastening hole, 33. Racket, 34. Mounting seat, 35. Positioning pin. Detailed Implementation

[0032] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: A valve assembly structure for a compressor (see...) Figure 1 , Figure 2 , Figure 3 , Figure 4 The system includes a crankcase cylinder block 1 and a cylinder head 2. The crankcase cylinder block 1 has a cylindrical structure, and the cylinder head 2 is fitted and connected to one end of the crankcase cylinder block 1. The cylinder head 2 is fitted onto the crankcase cylinder block 1, and a valve assembly unit 3 is installed inside the cylinder head 2.

[0033] Valve unit 3 includes a valve plate 4, an intake valve plate 5, and an exhaust valve plate 6. The valve plate 4 has a circular structure and is provided with an intake hole 7 and an exhaust hole 8. The intake valve plate 5 and the exhaust valve plate 6 respectively cover the opening ends of the intake hole 7 and the exhaust hole 8. The intake valve plate 5 includes a valve plate body 9 and a valve plate seat 10. The valve plate body 9 is formed by stamping on the circular valve plate seat 10. One end of the valve plate body 9 is integrally formed with the valve plate seat 10, and the other end of the valve plate body 9 is suspended. The valve plate seat 10 is provided with a venting slot 11 corresponding to the exhaust hole 8. The intake valve plate 5 and the exhaust valve plate 6 are respectively placed on both sides of the valve plate 4.

[0034] Valve assembly unit 3 also includes a first gasket 12 and a second gasket 13. The first gasket 12 is installed between the valve plate 4 and the cylinder head 2, and the second gasket 13 is installed between the intake valve plate 5 and the crankcase cylinder block 1. The first gasket 12 is provided with an intake window 14 and an exhaust window 15, which are respectively provided with the intake port 7 and the exhaust port 8. The exhaust valve plate 6 is located at the exhaust window 15. One end of the exhaust valve plate 6 is connected to the first gasket 12, and the other end of the exhaust valve plate 6 is suspended. The cylinder head 2 is provided with an intake chamber 16 and an exhaust chamber 17, which are respectively provided with the intake port 7 and the exhaust port 8. The outer wall of the cylinder head 2 is provided with an intake port 18 and an exhaust port 19.

[0035] An outwardly protruding intake nozzle 20 is provided on the outer wall of the cylinder head 2, and the opening of the intake nozzle 20 forms an intake port 18. An outwardly protruding clip is provided on the outer wall of the intake nozzle 20 to facilitate connection with other components. When the compressor is running, the crankshaft rotates, driving the piston to reciprocate. When the piston moves backward, a negative pressure is formed in the cavity, and the intake valve 5 opens. The refrigerant enters the compression cavity through the intake muffler and valve plate 4, and the intake valve 5 closes. The piston moves forward, compressing the refrigerant. The refrigerant heats up and pressurizes. When the piston moves forward and approaches the intake valve 5, the exhaust valve 6 opens. The compressed high-temperature and high-pressure refrigerant enters the exhaust system through the cylinder head 2, circulating repeatedly to achieve stable and efficient intake and exhaust operation of the compressor.

[0036] The crankcase cylinder block 1 is connected to a preload bracket 21. A disc spring 22 is installed between the preload bracket 21 and the cylinder head 2. The disc spring 22 provides preload force to the cylinder head 2, ensuring that the valve assembly unit 3 is sealed between the cylinder head 2 and the crankcase cylinder block 1. The small-diameter end of the disc spring 22 rests on the cylinder head 2, and the large-diameter end of the disc spring 22 rests on the preload bracket 21.

[0037] A positioning groove 23 is provided on the side wall of valve assembly unit 3, and a positioning rib 24 is provided on the inner wall of cylinder head 2. The positioning groove 23 and the positioning rib 24 are slidably inserted and connected. The valve plate 4, intake valve plate 5, first gasket 12, and second gasket 13 all have notches on their edges, and all the notches together form the positioning groove 23. A connecting ring 25 is provided on the end face of crankcase cylinder block 1. The outer diameter of the connecting ring 25 is smaller than the outer diameter of crankcase cylinder block 1. An installation groove 26 is provided on the outer wall of the connecting ring 25. Cylinder head 2 is fitted and inserted into the connecting ring 25. The positioning rib 24 is inserted and connected into the installation groove 26. The second gasket 13 is pressed against the end face of the connecting ring 25. A gap is left between the end face of cylinder head 2 and the end face of crankcase cylinder block 1. Precise positioning is achieved through the fitting of the positioning groove 23, the installation groove 26, and the positioning rib 24, preventing circumferential rotation between valve assembly unit 3 and cylinder head 2.

[0038] The preload bracket 21 has several circumferentially distributed claws 27, each with a locking hole 28. A locking connector 29 is provided on the outer wall of the crankcase cylinder block 1, and the locking holes 28 are engaged with the locking connector 29. In this embodiment, four circumferentially distributed claws 27 form a cross-shaped structure. The preload bracket 21 is engaged with the locking connector 29 on the crankcase cylinder block 1 through the locking holes 28 on the claws 27, making the connection convenient and reliable. After the valve assembly unit 3 is assembled and tested online, if the sealing performance of the valve assembly unit 3 is found to be poor, the claws 27 can be removed to release the preload force on the valve assembly unit 3. The components of the valve assembly unit 3 or the disc spring 22 can be replaced, and the assembly can be reassembled and tested again until the set requirements are met.

[0039] During the operation of the refrigeration compressor, the piston reciprocates continuously, drawing in and expelling air. The exhaust process exerts a significant impact force on valve assembly unit 3, necessitating a fixed sealing structure to counteract this force. The disc spring used is a special spring that is axially conical and bears the load. After being subjected to the load deformation caused by the preload bracket 21, it stores a certain amount of potential energy and releases some of this potential energy based on the impact force on valve assembly unit 3 to maintain the pressure between valve assembly units 3 to meet sealing requirements. The stress distribution of the disc spring decreases uniformly from the inside out, achieving a low-stroke, high-compensation-force effect. The preload force on the valve assembly is evenly distributed circumferentially, ensuring sealing performance. The additional compressive load released by the disc spring 22 is evenly distributed on the cylinder head 2, without tangential pressure on the cylinder bore, thus avoiding the problem of cylinder bore deformation caused by tangential pressure.

[0040] Example 2: A valve assembly structure for a compressor (see...) Figure 1 , Figure 2 , Figure 3 , Figure 4 The system includes a crankcase cylinder block 1 and a cylinder head 2. The crankcase cylinder block 1 has a cylindrical structure, and the cylinder head 2 is fitted and connected to one end of the crankcase cylinder block 1. The cylinder head 2 is fitted onto the crankcase cylinder block 1, and a valve assembly unit 3 is installed inside the cylinder head 2.

[0041] Valve unit 3 includes a valve plate 4, an intake valve plate 5, and an exhaust valve plate 6. The valve plate 4 has a circular structure and is provided with an intake hole 7 and an exhaust hole 8. The intake valve plate 5 and the exhaust valve plate 6 respectively cover the opening ends of the intake hole 7 and the exhaust hole 8. The intake valve plate 5 includes a valve plate body 9 and a valve plate seat 10. The valve plate body 9 is formed by stamping on the circular valve plate seat 10. One end of the valve plate body 9 is integrally formed with the valve plate seat 10, and the other end of the valve plate body 9 is suspended. The valve plate seat 10 is provided with a venting slot 11 corresponding to the exhaust hole 8. The intake valve plate 5 and the exhaust valve plate 6 are respectively placed on both sides of the valve plate 4.

[0042] Valve assembly unit 3 also includes a first gasket 12 and a second gasket 13. The first gasket 12 is installed between the valve plate 4 and the cylinder head 2, and the second gasket 13 is installed between the intake valve plate 5 and the crankcase cylinder block 1. The first gasket 12 is provided with an intake window 14 and an exhaust window 15, which are respectively provided with the intake port 7 and the exhaust port 8. The exhaust valve plate 6 is located at the exhaust window 15. One end of the exhaust valve plate 6 is connected to the first gasket 12, and the other end of the exhaust valve plate 6 is suspended. The cylinder head 2 is provided with an intake chamber 16 and an exhaust chamber 17, which are respectively provided with the intake port 7 and the exhaust port 8. The outer wall of the cylinder head 2 is provided with an intake port 18 and an exhaust port 19.

[0043] An outwardly protruding intake nozzle 20 is provided on the outer wall of the cylinder head 2, and the opening of the intake nozzle 20 forms an intake port 18. An outwardly protruding clip is provided on the outer wall of the intake nozzle 20 to facilitate connection with other components. When the compressor is running, the crankshaft rotates, driving the piston to reciprocate. When the piston moves backward, a negative pressure is formed in the cavity, and the intake valve 5 opens. The refrigerant enters the compression cavity through the intake muffler and valve plate 4, and the intake valve 5 closes. The piston moves forward, compressing the refrigerant. The refrigerant heats up and pressurizes. When the piston moves forward and approaches the intake valve 5, the exhaust valve 6 opens. The compressed high-temperature and high-pressure refrigerant enters the exhaust system through the cylinder head 2, circulating repeatedly to achieve stable and efficient intake and exhaust operation of the compressor.

[0044] The crankcase cylinder block 1 is connected to a preload bracket 21. A disc spring 22 is installed between the preload bracket 21 and the cylinder head 2. The disc spring 22 provides preload force to the cylinder head 2, ensuring that the valve assembly unit 3 is sealed between the cylinder head 2 and the crankcase cylinder block 1. The small-diameter end of the disc spring 22 rests on the cylinder head 2, and the large-diameter end of the disc spring 22 rests on the preload bracket 21.

[0045] A positioning groove 23 is provided on the side wall of valve assembly unit 3, and a positioning rib 24 is provided on the inner wall of cylinder head 2. The positioning groove 23 and the positioning rib 24 are slidably inserted and connected. The valve plate 4, intake valve plate 5, first gasket 12, and second gasket 13 all have notches on their edges, and all the notches together form the positioning groove 23. A connecting ring 25 is provided on the end face of crankcase cylinder block 1. The outer diameter of the connecting ring 25 is smaller than the outer diameter of crankcase cylinder block 1. An installation groove 26 is provided on the outer wall of the connecting ring 25. Cylinder head 2 is fitted and inserted into the connecting ring 25. The positioning rib 24 is inserted and connected into the installation groove 26. The second gasket 13 is pressed against the end face of the connecting ring 25. A gap is left between the end face of cylinder head 2 and the end face of crankcase cylinder block 1. Precise positioning is achieved through the fitting of the positioning groove 23, the installation groove 26, and the positioning rib 24, preventing circumferential rotation between valve assembly unit 3 and cylinder head 2.

[0046] The preload bracket 21 has several circumferentially distributed claws 27, each with a locking hole 28. A locking connector 29 is provided on the outer wall of the crankcase cylinder block 1, and the locking holes 28 are engaged with the locking connector 29. After the locking holes 28 and the locking connector 29 are engaged, the locking connector 29 is then welded to the claws 27. In this embodiment, four circumferentially distributed claws 27 form a cross-shaped structure. The preload bracket 21 is engaged with the locking connector 29 on the crankcase cylinder block 1 through the locking holes 28 on the claws 27, making the connection convenient and reliable. After the valve assembly unit 3 is assembled and tested online, if the sealing performance of the valve assembly unit 3 is found to be poor, the claws 27 can be removed to release the preload force on the valve assembly unit 3. The components of the valve assembly unit 3 or the disc spring 22 can be replaced, and the assembly can be reassembled and tested again until the set requirements are met. After the valve assembly unit 3 is assembled and put into trial operation, once the parameters meet the set requirements, the clamping connector 29 and the clamping claw 27 are welded together, thereby achieving a fixed connection between the preload bracket 21 and the crankcase cylinder block 1. This ensures that the preload bracket 21 provides reliable preload force to the cylinder head 2 when the valve assembly structure for the compressor is running in a closed cavity, preventing connection failure between the preload bracket 21 and the crankcase cylinder block 1.

[0047] During the operation of the refrigeration compressor, the piston reciprocates continuously, drawing in and expelling air. The exhaust process exerts a significant impact force on valve assembly unit 3, necessitating a fixed sealing structure to counteract this force. The disc spring used is a special spring that is axially conical and bears the load. After being subjected to the load deformation caused by the preload bracket 21, it stores a certain amount of potential energy and releases some of this potential energy based on the impact force on valve assembly unit 3 to maintain the pressure between valve assembly units 3 to meet sealing requirements. The stress distribution of the disc spring decreases uniformly from the inside out, achieving a low-stroke, high-compensation-force effect. The preload force on the valve assembly is evenly distributed circumferentially, ensuring sealing performance. The additional compressive load released by the disc spring 22 is evenly distributed on the cylinder head 2, without tangential pressure on the cylinder bore, thus avoiding the problem of cylinder bore deformation caused by tangential pressure.

[0048] Example 3: A valve assembly structure for a compressor (see...) Figure 5 The system includes a crankcase cylinder block 1 and a cylinder head 2. The crankcase cylinder block 1 has a cylindrical structure, and the cylinder head 2 is fitted and connected to one end of the crankcase cylinder block 1. The cylinder head 2 is fitted onto the crankcase cylinder block 1, and a valve assembly unit 3 is installed inside the cylinder head 2.

[0049] Valve unit 3 includes a valve plate 4, an intake valve plate 5, and an exhaust valve plate 6. The valve plate 4 has a circular structure and is provided with an intake hole 7 and an exhaust hole 8. The intake valve plate 5 and the exhaust valve plate 6 respectively cover the opening ends of the intake hole 7 and the exhaust hole 8. The intake valve plate 5 includes a valve plate body 9 and a valve plate seat 10. The valve plate body 9 is formed by stamping on the circular valve plate seat 10. One end of the valve plate body 9 is integrally formed with the valve plate seat 10, and the other end of the valve plate body 9 is suspended. The valve plate seat 10 is provided with a venting slot 11 corresponding to the exhaust hole 8. The intake valve plate 5 and the exhaust valve plate 6 are respectively placed on both sides of the valve plate 4.

[0050] Valve assembly unit 3 also includes a first gasket 12 and a second gasket 13. The first gasket 12 is installed between the valve plate 4 and the cylinder head 2, and the second gasket 13 is installed between the intake valve plate 5 and the crankcase cylinder block 1. The first gasket 12 is provided with an intake window 14 and an exhaust window 15, which are respectively provided with the intake port 7 and the exhaust port 8. The exhaust valve plate 6 is located at the exhaust window 15. One end of the exhaust valve plate 6 is connected to the first gasket 12, and the other end of the exhaust valve plate 6 is suspended. The cylinder head 2 is provided with an intake chamber 16 and an exhaust chamber 17, which are respectively provided with the intake port 7 and the exhaust port 8. The outer wall of the cylinder head 2 is provided with an intake port 18 and an exhaust port 19.

[0051] An outwardly protruding intake nozzle 20 is provided on the outer wall of the cylinder head 2, and the opening of the intake nozzle 20 forms an intake port 18. An outwardly protruding clip is provided on the outer wall of the intake nozzle 20 to facilitate connection with other components. When the compressor is running, the crankshaft rotates, driving the piston to reciprocate. When the piston moves backward, a negative pressure is formed in the cavity, and the intake valve 5 opens. The refrigerant enters the compression cavity through the intake muffler and valve plate 4, and the intake valve 5 closes. The piston moves forward, compressing the refrigerant. The refrigerant heats up and pressurizes. When the piston moves forward and approaches the intake valve 5, the exhaust valve 6 opens. The compressed high-temperature and high-pressure refrigerant enters the exhaust system through the cylinder head 2, circulating repeatedly to achieve stable and efficient intake and exhaust operation of the compressor.

[0052] The crankcase cylinder block 1 is connected to a preload bracket 21. A disc spring 22 is installed between the preload bracket 21 and the cylinder head 2. The disc spring 22 provides preload force to the cylinder head 2, ensuring that the valve assembly unit 3 is sealed between the cylinder head 2 and the crankcase cylinder block 1. The small-diameter end of the disc spring 22 rests on the cylinder head 2, and the large-diameter end of the disc spring 22 rests on the preload bracket 21.

[0053] A positioning groove 23 is provided on the side wall of valve assembly unit 3, and a positioning rib 24 is provided on the inner wall of cylinder head 2. The positioning groove 23 and the positioning rib 24 are slidably inserted and connected. The valve plate 4, intake valve plate 5, first gasket 12, and second gasket 13 all have notches on their edges, and all the notches together form the positioning groove 23. A connecting ring 25 is provided on the end face of crankcase cylinder block 1. The outer diameter of the connecting ring 25 is smaller than the outer diameter of crankcase cylinder block 1. An installation groove 26 is provided on the outer wall of the connecting ring 25. Cylinder head 2 is fitted and inserted into the connecting ring 25. The positioning rib 24 is inserted and connected into the installation groove 26. The second gasket 13 is pressed against the end face of the connecting ring 25. A gap is left between the end face of cylinder head 2 and the end face of crankcase cylinder block 1. Precise positioning is achieved through the fitting of the positioning groove 23, the installation groove 26, and the positioning rib 24, preventing circumferential rotation between valve assembly unit 3 and cylinder head 2.

[0054] The pre-tensioning frame 21 has several circumferentially distributed claws 27, each with a locking hole 28. In this embodiment, four circumferentially distributed claws 27 form a cross shape. An adjusting ring 30 is threaded onto the outer wall of the crankcase cylinder body 1. The adjusting ring 30 has a locking connector 29, and the locking hole 28 is engaged with the locking connector 29. After the adjusting ring 30 is rotated into position, it is welded to the outer wall of the crankcase cylinder body 1, and the locking connector 29 is welded to the claws 27.

[0055] After valve assembly unit 3 is assembled and put into trial operation, if poor sealing performance is found, it may be due to insufficient preload. In this case, first rotate the adjusting ring 30 to move it away from the cylinder head 2 by one end, thereby increasing the preload on the cylinder head 2. Then, put it into trial operation again. After the trial operation meets the requirements, weld the adjusting ring 30 to the outer wall of the crankcase cylinder block 1, and weld the clamping connector 29 to the clamping claw 27, thereby achieving a fixed connection between the preload bracket 21 and the crankcase cylinder block 1. This ensures that the preload bracket 21 provides reliable preload on the cylinder head 2 when the valve assembly structure of the compressor is running in the closed cavity, preventing the connection between the preload bracket 21 and the crankcase cylinder block 1 from failing.

[0056] If the online test parameters do not meet the requirements due to insufficient preload, they can be adjusted by rotating the adjusting ring 30 without disassembling the preload frame 21 to adjust or replace the valve group unit 3 and the butterfly spring 22, thus simplifying the operation.

[0057] During the operation of the refrigeration compressor, the piston reciprocates continuously, drawing in and expelling air. The exhaust process exerts a significant impact force on valve assembly unit 3, necessitating a fixed sealing structure to counteract this force. The disc spring used is a special spring that is axially conical and bears the load. After being subjected to the load deformation caused by the preload bracket 21, it stores a certain amount of potential energy and releases some of this potential energy based on the impact force on valve assembly unit 3 to maintain the pressure between valve assembly units 3 to meet sealing requirements. The stress distribution of the disc spring decreases uniformly from the inside out, achieving a low-stroke, high-compensation-force effect. The preload force on the valve assembly is evenly distributed circumferentially, ensuring sealing performance. The additional compressive load released by the disc spring 22 is evenly distributed on the cylinder head 2, without tangential pressure on the cylinder bore, thus avoiding the problem of cylinder bore deformation caused by tangential pressure.

[0058] Example 4: A valve assembly structure for a compressor (see...) Figure 6 The system includes a crankcase cylinder block 1 and a cylinder head 2. The crankcase cylinder block 1 has a cylindrical structure, and the cylinder head 2 is fitted and connected to one end of the crankcase cylinder block 1. The cylinder head 2 is fitted onto the crankcase cylinder block 1, and a valve assembly unit 3 is installed inside the cylinder head 2.

[0059] Valve unit 3 includes a valve plate 4, an intake valve plate 5, and an exhaust valve plate 6. The valve plate 4 has a circular structure and is provided with an intake hole 7 and an exhaust hole 8. The intake valve plate 5 and the exhaust valve plate 6 respectively cover the opening ends of the intake hole 7 and the exhaust hole 8. The intake valve plate 5 includes a valve plate body 9 and a valve plate seat 10. The valve plate body 9 is formed by stamping on the circular valve plate seat 10. One end of the valve plate body 9 is integrally formed with the valve plate seat 10, and the other end of the valve plate body 9 is suspended. The valve plate seat 10 is provided with a venting slot 11 corresponding to the exhaust hole 8. The intake valve plate 5 and the exhaust valve plate 6 are respectively placed on both sides of the valve plate 4.

[0060] Valve assembly unit 3 also includes a first gasket 12 and a second gasket 13. The first gasket 12 is installed between the valve plate 4 and the cylinder head 2, and the second gasket 13 is installed between the intake valve plate 5 and the crankcase cylinder block 1. The first gasket 12 is provided with an intake window 14 and an exhaust window 15, which are respectively provided with the intake port 7 and the exhaust port 8. The exhaust valve plate 6 is located at the exhaust window 15. One end of the exhaust valve plate 6 is connected to the first gasket 12, and the other end of the exhaust valve plate 6 is suspended. The cylinder head 2 is provided with an intake chamber 16 and an exhaust chamber 17, which are respectively provided with the intake port 7 and the exhaust port 8. The outer wall of the cylinder head 2 is provided with an intake port 18 and an exhaust port 19.

[0061] An outwardly protruding intake nozzle 20 is provided on the outer wall of the cylinder head 2, and the opening of the intake nozzle 20 forms an intake port 18. An outwardly protruding clip is provided on the outer wall of the intake nozzle 20 to facilitate connection with other components. When the compressor is running, the crankshaft rotates, driving the piston to reciprocate. When the piston moves backward, a negative pressure is formed in the cavity, and the intake valve 5 opens. The refrigerant enters the compression cavity through the intake muffler and valve plate 4, and the intake valve 5 closes. The piston moves forward, compressing the refrigerant. The refrigerant heats up and pressurizes. When the piston moves forward and approaches the intake valve 5, the exhaust valve 6 opens. The compressed high-temperature and high-pressure refrigerant enters the exhaust system through the cylinder head 2, circulating repeatedly to achieve stable and efficient intake and exhaust operation of the compressor.

[0062] The crankcase cylinder block 1 is connected to a preload bracket 21. A disc spring 22 is installed between the preload bracket 21 and the cylinder head 2. The disc spring 22 provides preload force to the cylinder head 2, ensuring that the valve assembly unit 3 is sealed between the cylinder head 2 and the crankcase cylinder block 1. The small-diameter end of the disc spring 22 rests on the cylinder head 2, and the large-diameter end of the disc spring 22 rests on the preload bracket 21.

[0063] A positioning groove 23 is provided on the side wall of valve assembly unit 3, and a positioning rib 24 is provided on the inner wall of cylinder head 2. The positioning groove 23 and the positioning rib 24 are slidably inserted and connected. The valve plate 4, intake valve plate 5, first gasket 12, and second gasket 13 all have notches on their edges, and all the notches together form the positioning groove 23. A connecting ring 25 is provided on the end face of crankcase cylinder block 1. The outer diameter of the connecting ring 25 is smaller than the outer diameter of crankcase cylinder block 1. An installation groove 26 is provided on the outer wall of the connecting ring 25. Cylinder head 2 is fitted and inserted into the connecting ring 25. The positioning rib 24 is inserted and connected into the installation groove 26. The second gasket 13 is pressed against the end face of the connecting ring 25. A gap is left between the end face of cylinder head 2 and the end face of crankcase cylinder block 1. Precise positioning is achieved through the fitting of the positioning groove 23, the installation groove 26, and the positioning rib 24, preventing circumferential rotation between valve assembly unit 3 and cylinder head 2.

[0064] The pretensioning frame 21 has several circumferentially distributed pawls 27. In this embodiment, four circumferentially distributed pawls 27 form a cross shape. The pawls 27 are provided with elongated ratchet teeth 31. The crankcase cylinder body 1 is provided with a fastening hole 32. A ratchet 33 is installed in the fastening hole 32. The pawls 27 are movably inserted into the fastening hole 32, and the ratchet 33 rests between two adjacent ratchet teeth 31. After the pretensioning frame 21 is connected in place, the pawls 27 are welded to the crankcase cylinder body 1. A mounting base 34 is detachably connected in the fastening hole 32. The ratchet 33 is rotatably mounted on the mounting base 34. A torsion spring is connected between the ratchet 33 and the mounting base 34. A positioning post 35 is provided on the mounting base 34, and the ratchet 33 abuts against the positioning post 35.

[0065] After valve assembly unit 3 is assembled, the pawl 33 rests between two adjacent ratchet teeth 31 to prevent the pawl 27 from disengaging from the fastening hole 32, ensuring a reliable connection of the preload bracket 21. After assembly, valve assembly unit 3 is tested online. If poor sealing performance is found, it may be due to insufficient preload. In this case, the preload bracket 21 is further pushed towards the crankcase cylinder block 1, causing the pawl 33 to slide past the ratchet teeth 31, achieving positioning and locking. This increases the preload force of the disc spring 22 on the cylinder head 2. After the test runs successfully, the pawl 27 is welded to the fastening hole 32 on the crankcase cylinder block 1, thus achieving a fixed connection between the preload bracket 21 and the crankcase cylinder block 1. This ensures that the preload bracket 21 provides reliable preload force to the cylinder head 2 when the compressor valve assembly structure is running in a closed cavity, preventing connection failure between the preload bracket 21 and the crankcase cylinder block 1.

[0066] If insufficient preload causes the online test parameters to fail to meet requirements, adjustment can be made by moving the preload bracket 21 without disassembling the preload bracket 21 to adjust or replace the valve assembly unit 3 and the disc spring 22, simplifying the operation. When it is necessary to disassemble the preload bracket 21, simply remove the mounting assembly at the fastening hole 32 to pull off the preload bracket 21, making the operation convenient.

[0067] During the operation of the refrigeration compressor, the piston reciprocates continuously, drawing in and expelling air. The exhaust process exerts a significant impact force on valve assembly unit 3, necessitating a fixed sealing structure to counteract this force. The disc spring used is a special spring that is axially conical and bears the load. After being subjected to the load deformation caused by the preload bracket 21, it stores a certain amount of potential energy and releases some of this potential energy based on the impact force on valve assembly unit 3 to maintain the pressure between valve assembly units 3 to meet sealing requirements. The stress distribution of the disc spring decreases uniformly from the inside out, achieving a low-stroke, high-compensation-force effect. The preload force on the valve assembly is evenly distributed circumferentially, ensuring sealing performance. The additional compressive load released by the disc spring 22 is evenly distributed on the cylinder head 2, without tangential pressure on the cylinder bore, thus avoiding the problem of cylinder bore deformation caused by tangential pressure.

[0068] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications may be made without departing from the technical solutions described in the claims.

Claims

1. A valve assembly structure for a compressor, characterized in that, It includes a crankcase cylinder block and a cylinder head. The cylinder head is fitted onto the crankcase cylinder block. A valve assembly unit is installed inside the cylinder head. The crankcase cylinder block is connected to a preload bracket. A butterfly spring is installed between the preload bracket and the cylinder head. The butterfly spring provides preload force to the cylinder head so that the valve assembly unit is sealed between the cylinder head and the crankcase cylinder block.

2. The valve assembly structure for a compressor according to claim 1, characterized in that, The valve assembly unit includes a valve plate, an intake valve plate, and an exhaust valve plate. The valve plate is provided with an intake hole and an exhaust hole. The intake valve plate and the exhaust valve plate cover the opening ends of the intake hole and the exhaust hole, respectively. The intake valve plate and the exhaust valve plate are respectively placed on both sides of the valve plate.

3. The valve assembly structure for a compressor according to claim 2, characterized in that, The cylinder head is provided with an intake chamber and an exhaust chamber, which are respectively set with an intake port and an exhaust port. The cylinder head is provided with an intake port and an exhaust port on its outer wall.

4. The valve assembly structure for a compressor according to claim 2, characterized in that, The valve assembly unit also includes a first gasket and a second gasket. The first gasket is installed between the valve plate and the cylinder head, and the second gasket is installed between the intake valve plate and the crankcase cylinder block. The first gasket is provided with an intake window and an exhaust window, which are respectively provided with the intake port and the exhaust port. The exhaust valve plate is located at the exhaust window position.

5. The valve assembly structure for a compressor according to claim 1, characterized in that, The valve unit sidewall is provided with a positioning groove, and the cylinder head inner wall is provided with a positioning rib. The positioning groove and the positioning rib are slidably inserted and connected.

6. The valve assembly structure for a compressor according to claim 5, characterized in that, A connecting ring is provided on the end face of the crankcase cylinder block, and an installation groove is provided on the outer wall of the connecting ring. The cylinder head is fitted and inserted into the connecting ring, and the positioning rib is inserted and connected to the installation groove.

7. A valve assembly structure for a compressor according to any one of claims 1 to 6, characterized in that, The preload bracket is provided with several claws evenly distributed around the circumference. The claws are provided with locking holes. The crankcase cylinder body is provided with locking connectors. The locking holes and locking connectors are locked together.

8. A valve assembly structure for a compressor according to claim 7, characterized in that, After the card slot and card connector are engaged, the card connector and card claw are then welded together.

9. A valve assembly structure for a compressor according to any one of claims 1 to 6, characterized in that, The preload bracket is circumferentially distributed with several jaws, each with a locking hole. An adjusting ring is threaded onto the outer wall of the crankcase cylinder body, and a locking connector is provided on the adjusting ring. The locking holes and locking connectors are engaged and connected. After the adjusting ring rotates to the correct position, it is welded to the outer wall of the crankcase cylinder body, and the locking connector is welded to the jaws.

10. A valve assembly structure for a compressor according to any one of claims 1 to 6, characterized in that, The preload bracket is provided with several pawls evenly distributed around its circumference, and the pawls are provided with long strip-shaped ratchet teeth; the crankcase cylinder block is provided with fastening holes, and the pawls are installed in the fastening holes. The pawls are movably inserted into the fastening holes, and the pawls rest between two adjacent ratchet teeth; after the preload bracket is connected in place, the pawls are welded to the crankcase cylinder block.

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