Intake and exhaust one-way valve of reciprocating pump

Abstract

The invention discloses an air intake and exhaust one-way valve of a reciprocating pump. The one-way valve comprises a sliding sealing surface, a retaining ring, a sealing ring, buffer rubber, an inflow plate and an outflow plate, a sealing ring groove for mounting the sealing ring and the sealing ring lining rubber is formed in the retaining ring; the sliding sealing surface is in sliding connection with the retaining ring through a sealing ring; the other end of the retaining ring is contained in a groove, the groove is formed by combining a flow inlet plate and a flow outlet plate, a lateral buffering rubber structure is arranged between two radial faces of the flow inlet plate and the flow outlet plate, a movement gap is reserved between the two radial faces of the flow inlet plate and the flow outlet plate, and a flow drainage hole is formed in the flow outlet plate. Collision between metal parts in the equipment working process is effectively reduced, so that noise is greatly reduced, the equipment operating environment is improved, and the equipment using comfort and safety are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluid conveying equipment, and specifically relates to a reciprocating pump inlet and exhaust one-way valve. The one-way valve is mainly used in vacuum pumps, air compressors, water pumps, oil pumps and other equipment to achieve one-way on-off control of the fluid during the suction and pressurization process. Background Art

[0002] The check valve is one of the most critical and core components in a reciprocating pump. Its fundamental function is to ensure that the fluid in the pump can only flow in one direction (from inlet to outlet) to prevent backflow.

[0003] The applicant's two utility models, "A Low-Resistance Check Valve Reciprocating Pump" (Patent No. 2021219713237) and "A Series Two-Stage Reciprocating Pump" (Patent No. 2021219713364), propose a low-resistance check valve structure. However, this check valve utilizes a rubber ring structure and relies on lubricating oil for operation, failing to meet the requirements of oil-free operation.

[0004] To achieve oil-free operation, the applicant used a stepped seal made of polytetrafluoroethylene (PTFE) that does not require lubrication, and secured and contained it by forming a grooved structure on the metal piston outer ring, thereby achieving the one-way on-off function of the low-resistance one-way valve. However, in actual application, it was found that this structure had obvious defects: metal collisions would occur between the piston outer ring and the piston outlet plate and piston inlet plate, which are also made of metal, during operation, resulting in increased abnormal noise during operation of the equipment; at the same time, the sealing performance during one-way closing was poor, seriously affecting the overall performance and user experience of the equipment. Therefore, there is an urgent need to improve the existing one-way valve structure to solve the above problems. Summary of the Invention

[0005] The present invention aims to provide a reciprocating pump inlet and exhaust check valve to address the aforementioned issues of high noise levels and poor sealing performance in the prior art. By optimizing the structural design, the valve effectively reduces abnormal noise during operation and significantly improves sealing performance, meeting the requirements for efficient and stable operation.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a reciprocating pump intake and exhaust one-way valve, comprising a sliding sealing surface, a retaining ring, a sealing ring and a buffer rubber, an inlet plate and an outlet plate; the retaining ring is provided with a sealing ring groove for installing the sealing ring and the sealing ring lining rubber; the sliding sealing surface and the retaining ring are slidably connected via the sealing ring; the other end of the retaining ring is accommodated in a groove, the groove is composed of an inlet plate and an outlet plate, a lateral buffer rubber structure is provided between the two radial surfaces of the inlet plate and the outlet plate, and a movement gap is retained, and a leakage hole is opened on the outlet plate.

[0007] Furthermore, the one-way valve is of piston type, the retaining ring is the piston outer ring, the inlet plate is the piston inlet plate, the outlet plate is the piston outlet plate, and the sliding sealing surface is the inner wall of the cylinder; a piston ring groove for installing a piston ring and a piston ring lining rubber is provided on the outer diameter surface of the piston outer ring; the other end of the piston outer ring is accommodated in a groove formed between the piston inlet plate and the piston outlet plate; a piston side buffer rubber is provided between the two axial surfaces of the piston outer ring and the axial surface of the groove.

[0008] Furthermore, the one-way valve is of a diaphragm type, the retaining ring is the inner diaphragm, the outflow plate is the outflow diaphragm, and the inlet plate is the inflow diaphragm; when used in a cylinder, the inner diaphragm, the outflow diaphragm and the inlet diaphragm are installed at both ends of the cylinder liner, and the sliding sealing surface is the piston shaft; the inner diameter surface of the inner diaphragm is provided with a shaft sealing ring groove, and the shaft sealing ring groove is provided with a diaphragm sealing ring and a diaphragm sealing ring lining rubber; the other end of the inner diaphragm is installed in the groove formed between the inlet diaphragm and the outflow diaphragm; a diaphragm buffer rubber is provided between the two axial surfaces of the inner diaphragm and the axial surface of the groove.

[0009] Furthermore, the piston side buffer rubber and the piston outer ring are split structures.

[0010] Furthermore, the partition buffer rubber and the inner partition are also split structures.

[0011] Furthermore, the one-way valve is a combination of a piston type and a diaphragm type; the retaining ring is divided into a piston outer ring and an inner diaphragm, the outflow plate is divided into a piston outflow plate and an outflow diaphragm, and the inflow plate is divided into a piston inflow plate and an inflow diaphragm; A piston ring groove for mounting a piston ring and piston ring lining rubber is provided on the outer diameter surface of the piston outer ring; the other end of the piston outer ring is accommodated in a groove formed between the piston inlet plate and the piston outlet plate; a piston side buffer rubber is provided between the two axial surfaces of the piston outer ring and the axial surface of the groove; When used in a cylinder, an inner baffle, an outflow baffle and an inlet baffle are installed at both ends of the cylinder liner, and the sliding sealing surface is the piston shaft; the inner diameter surface of the inner baffle is provided with a shaft sealing ring groove, and the shaft sealing ring groove is provided with a baffle sealing ring and a baffle sealing ring lining rubber; the other end of the inner baffle is installed in the groove formed between the inlet baffle and the outflow baffle; baffle buffer rubber is provided between the two axial surfaces of the inner baffle and the axial surface of the groove; the outer ring of the piston is arranged between the two inner baffles.

[0012] Furthermore, the number of the leakage holes in the retaining ring, the outflow plate and the inflow plate is increased; and the protrusion length of the retaining ring is increased.

[0013] Furthermore, the piston side buffer rubber and the piston outer ring are an integrated structure, and the piston side buffer rubber is arranged on one end of the piston outer ring with an annular protrusion.

[0014] Furthermore, the partition buffer rubber and the inner partition are an integrated structure, and the partition buffer rubber is arranged on one end of the inner partition with an annular protrusion.

[0015] Further, the inner protrusion of the piston outer ring is provided with a piston outer ring step for blocking the piston lateral buffer rubber from being embedded into the axial gap; the outer protrusion of the inner partition plate is provided with an inner partition plate step for blocking the partition plate buffer rubber from being embedded into the axial gap.

[0016] In the present application, the sealing member is one of a circular rubber ring, a rectangular rubber ring, a star-shaped rubber ring, or a double-rubber-ring sealing structure, and the material of the sealing member is one of rubber, nylon, bakelite, and polytetrafluoroethylene.

[0017] The present application effectively reduces the collision between metal parts during the operation of the equipment by arranging the piston lateral buffer rubber and the partition plate buffer rubber between the metal parts, thereby greatly reducing the noise, improving the operation environment of the equipment, and improving the comfort and safety of the equipment. The arrangement of the buffer rubber fills the gap between the parts, effectively reduces the fluid leakage, significantly improves the sealing effect between the piston assembly and the cylinder sleeve and between the partition plate assembly and the piston shaft, improves the working efficiency and reliability of the equipment, and reduces the energy loss and performance decline caused by leakage. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of a combination example of the present application; Figure 2 is a sectional schematic diagram of a piston assembly and a partition plate assembly; Figure 3 is a schematic diagram of a multi-layer fluid hole series double-stage reciprocating pump in one embodiment of the present application; Figure 4 is a sectional schematic diagram of a multi-layer fluid hole (partition plate assembly) in the present application; Figure 3 Figure 5 is a schematic diagram of a series multi-stage reciprocating pump using an integrated buffer rubber; Figure 6 is a schematic diagram of an inner partition plate using an integrated buffer rubber; Figure 7 is a schematic diagram of a shoulder structure of an air inlet and exhaust one-way valve; Figure 8 is an enlarged schematic diagram of a piston assembly in the present application; Figure 1 Figure 9 is a schematic diagram of buffer rubbers of three schemes; Figure 10 is a photograph of a piston assembly; Figure 11 is a photograph of a partition plate; Figure 12 is a comparison diagram of used lateral buffer rubber and brand-new lateral buffer rubber (color change, little change in size); ​​The figure shows in detail the structure and connection relationship of the components of the one-way valve, as well as the fluid flow path and component movement status during operation. The markings and names of the components are as follows: 1. Piston assembly; 2. Partition assembly; 3. End cover; 4. Cylinder liner; 5. Piston shaft; 6. Inlet port; 7. Exhaust port; 8. Flange; 9. Piston movement direction arrow; 10. Shaft extension sleeve; 11. Piston outer ring; 12. Piston inlet plate; 13. Piston outlet plate; 14. Piston flow hole; 15. Piston guide strip; 16. Piston ring; 17. Piston ring lining rubber; 18. Piston side cushion rubber; 19. Piston plate fixing screw; 20. Integrated partition drain groove; 21. Inner partition; 22. Inlet partition; 23. Outlet partition; 24. Partition flow hole; 25. Integrated partition sealing rib; 26. Partition sealing ring; 27. Partition sealing ring lining rubber; 28. Partition cushion rubber; 29. Beveled partition; 30. Outer partition; 37. Piston outer ring shoulder; 38. Inner partition shoulder; 39. Cylinder seal; 40. Piston shaft seal; 51. Piston flow path; 52. Piston shut-off path; 53. Partition flow path; 54. Partition shut-off path. DETAILED DESCRIPTION

[0019] The embodiments of the present invention will now be described with reference to the accompanying drawings. It will be understood by those skilled in the art that the following embodiments are intended to illustrate the present invention only and should not be construed as limiting the scope of the present invention. Where specific techniques, connections, or conditions are not specified in the examples, the techniques, connections, and conditions described in the literature in the art or in accordance with the product specifications were used. Materials, instruments, or equipment used, where the manufacturer is not specified, are all commercially available conventional products.

[0020] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "provided with" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances. Example 1

[0021] like Figure 1 As shown, the present invention provides a reciprocating pump intake and exhaust check valve, including an end cover, a cylinder sleeve, a piston shaft, an intake port, an exhaust port, a flange and a shaft extension sleeve, and the end cover is divided into an upper end cover and a lower end cover.

[0022] The upper end cover is connected to the cylinder liner through the No. 1 partition assembly, and the lower end cover is connected to the cylinder liner through the No. 2 partition assembly. The lower end cover is provided with an exhaust port; a piston assembly is slidably connected inside the cylinder liner; the piston shaft is arranged on the piston assembly and is slidably connected to the No. 1 partition assembly and the No. 2 partition assembly; a flange is provided at the outer end of the upper end cover, and a shaft extension sleeve is provided at the inner end, and the position of the shaft extension sleeve is the air inlet.

[0023] Both the No. 1 baffle assembly and the No. 2 baffle assembly are composed of an inner baffle, an outflow baffle and an inlet baffle (with slight differences in shape and structure). The outer diameter surface of the inner baffle is provided with an annular protrusion, and the inner diameter surface is provided with a sealing ring groove, a baffle sealing ring is installed in the sealing ring groove, and a baffle sealing ring lining rubber is installed on the outer diameter surface of the baffle sealing ring; the baffle sealing ring and the outer diameter of the piston shaft are sealed by sliding fit; baffle flow holes are distributed in an annular manner on the outflow baffle, the inner end of which is embedded in one side of the annular protrusion, and the outer end is sealed to the cylinder sleeve; the inner end of the inflow baffle is embedded in the other side of the annular protrusion, and the outer end is sealed to the cylinder sleeve; baffle buffer rubber is provided between the annular protrusion and the outflow baffle and the inflow baffle; one end of the inner baffle with an annular protrusion is embedded in the groove formed between the inlet baffle and the outflow baffle. The inlet baffle and the outflow baffle can be fixed by pressing two piston shafts, or fixed by screw threads between the two pieces themselves ( Figure 2 ), can also be fixed by the piston plate fixing screws ( Figure 5 ), unlike the piston assembly's outer diameter seal, the diaphragm assembly provides an inner diameter seal. Example 2

[0024] like Figure 1 or Figure 2 As shown, the one-way valve in this embodiment is a piston type and can be used for a piston-type outer diameter one-way valve. In the application of the piston, the retaining ring is the piston outer ring 11, the inlet plate is the piston inlet plate 12, the outlet plate is the piston outlet plate 13, and the sliding sealing surface is the inner wall of the cylinder. The outer diameter surface of the piston outer ring 11 is provided with a piston ring groove for mounting a piston ring 16 and a piston ring lining rubber 17. The other end of the piston outer ring 11 is accommodated in a groove formed between the piston inlet plate 12 and the piston outlet plate 13. A piston side buffer rubber 18 is provided between the two axial surfaces of the piston outer ring 11 and the axial surface of the groove. It is used to buffer the collision between the piston outer ring and the piston inlet plate and piston outlet plate, while enhancing the sealing effect. The piston outer ring, piston inlet plate, and piston outlet plate are collectively referred to as the piston assembly 1. The piston assembly 1 is slidably fitted with the inner diameter of the cylinder liner 4 through the piston ring 16.

[0025] The piston side buffer rubber 18 and the piston outer ring 11 are of a split structure, and a groove structure is provided on the piston assembly 1 to accommodate the piston side buffer rubber 18. The side buffer rubber can be a circular rubber ring, a rectangular rubber ring, a star-shaped rubber ring or a double rubber ring sealing structure, such as Figure 9 shown.

[0026] An annular boss I is provided on the outside of the piston outlet plate, an annular groove I is provided at the bottom of the annular boss I, and a piston flow hole is provided on the annular groove I; a slot hole for installing a piston guide belt is provided in an annular shape on the outside of the piston outlet plate; the piston inlet plate is arranged on the piston outlet plate; an annular boss II is provided on the inside of the piston outer ring, an annular groove II is provided at the bottom of the annular boss II, and a piston ring groove I for installing a piston ring is provided on the outer diameter surface of the piston outer ring, and the piston assembly is slidably fitted through the piston ring and the inner diameter of the cylinder liner; the piston outer ring is arranged on the piston outlet plate, and one end thereof with the annular boss II is embedded between the piston outlet plate and the piston inlet plate; lateral buffer rubber is provided in the annular groove I and the annular groove II for buffering the collision between the piston outer ring and the piston inlet plate and the piston outlet plate, and at the same time enhancing the sealing effect. Example 3

[0027] like Figure 1 or Figure 2 As shown, the one-way valve in this embodiment is of diaphragm type to achieve inner diameter sealing; the retaining ring is the inner diaphragm 21, the outflow plate is the outflow diaphragm 23, and the inflow plate is the inflow diaphragm 22; when used in the cylinder, the inner diaphragm 21, the outflow diaphragm 23 and the inflow diaphragm 22 are installed at both ends of the cylinder liner 4, and the sliding sealing surface is the piston shaft 5; the inner diameter surface of the inner diaphragm 21 is provided with a shaft sealing ring groove, and the shaft sealing ring groove is provided with a diaphragm sealing ring 26 and a diaphragm sealing ring lining 27, and the diaphragm sealing ring 26 and the piston shaft are sealed. The outer diameter of the inner baffle 21 is sealed by a sliding fit; the other end of the inner baffle 21 fits into the groove formed between the inlet baffle 22 and the outlet baffle 23; baffle rubber buffer 28 is provided between the axial surfaces of the inner baffle 21 and the axial surfaces of the groove. The inner baffle 21, the outlet baffle 23, and the inlet baffle 22 are collectively referred to as the baffle assembly 2. The inlet baffle 22 and the outlet baffle 23 can be secured by compression between the two piston shafts 5, by threading between the two pieces, or by the piston plate fixing screws 19. Unlike the outer diameter seal of the piston assembly 1, the baffle assembly 2 achieves an inner diameter seal.

[0028] The partition buffer rubber 28 and the inner partition 21 are also split structures, and a groove structure is provided on the partition assembly 2 to accommodate the partition buffer rubber 28. The partition buffer rubber can adopt a circular rubber ring, a rectangular rubber ring, a star-shaped rubber ring or a double rubber ring sealing structure, such as Figure 9 shown.

[0029] The above structural arrangement achieves the basic function of a check valve, effectively reducing equipment operating noise and improving sealing performance. For vacuum pumps with small piston diameters, where lateral pressure is low, ordinary rubber rings can be used. However, for larger cylinder diameters, where lateral pressure increases, materials such as polytetrafluoroethylene, nylon, and bakelite are required to meet operational requirements. Large-diameter equipment is generally used in industrial applications and has a relatively high tolerance for noise. Example 4

[0030] like Figure 1 As shown, the one-way valve in this embodiment is a combination of piston type and diaphragm type, which realizes comprehensive sealing of inner and outer diameters; The retaining ring is divided into the piston outer ring 11 and the inner partition 21, the outflow plate is divided into the piston outflow plate 13 and the outflow partition 23, and the inflow plate is divided into the piston inflow plate 12 and the inflow partition 22; A piston ring groove is provided on the outer diameter surface of the piston outer ring 11 for mounting a piston ring 16 and a piston ring lining rubber 17. The other end of the piston outer ring 11 is accommodated in a groove formed between the piston inlet plate 12 and the piston outlet plate 13. A piston side buffer rubber 18 is provided between the two axial surfaces of the piston outer ring 11 and the axial surface of the groove. When used in a cylinder, both ends of the cylinder liner 4 are fitted with an inner baffle 21, an outflow baffle 23, and an inflow baffle 22, with the piston shaft 5 as the sliding sealing surface. The inner diameter of the inner baffle 21 is provided with a shaft sealing ring groove, which houses a baffle sealing ring 26 and a baffle sealing ring rubber liner 27. The baffle sealing ring 26 slides against the outer diameter of the piston shaft 5 to achieve a seal. The other end of the inner baffle 21 fits into the groove formed between the inflow baffle 22 and the outflow baffle 23. Baffle rubber buffers 28 are provided between the axial surfaces of the inner baffle 21 and the axial surfaces of the groove. The piston outer ring 11 is positioned between the two inner baffles 21. The piston and baffle assemblies work together to achieve comprehensive sealing control of the reciprocating pump's intake and exhaust. Example 5

[0031] In this embodiment, the one-way valve features a parallel multi-layered hole structure. The number of drain holes in the retaining ring, outlet plate, and inlet plate is increased. The increased protrusion length of the retaining ring facilitates the design of a multi-layered hole structure to meet varying flow and pressure requirements. This design enables the one-way valve to maintain excellent fluid control performance even under complex operating conditions. The drain holes can be designed as circular, elliptical, or other shapes based on actual needs.

[0032] like Figure 3 and Figure 4 As shown, in this embodiment, both ends of the cylinder sleeve 4 are equipped with a partition assembly 2. The protruding length of the inner partition 21 is increased to facilitate the design of a multi-layer perforated structure. A partition cushion rubber 28 is provided axially. In this embodiment, the cushion rubber can be made into a sheet. The outflow partition 23 on the right side has the same distribution of the drain holes A24 as the inner partition 21, but is staggered with the inflow holes of the left inflow partition 22. When the piston shaft 5 drives the piston assembly 1 to move leftward, as shown in FIG. Figure 3 As shown in the upper part, the inner partition 21 is driven by the piston shaft to move toward the inlet partition 22 on the left side, and the inlet partition 22 and the inner partition 21 are close to each other, the gap is blocked, and the passage is blocked, as shown by the partition blocking path 54; when the piston shaft 5 drives the piston assembly 1 to move to the right, as shown in FIG. Figure 3As shown in the lower part, the inner partition 21 is driven by the piston shaft to lean against the outflow partition 23 on the right side, the inlet partition 22 and the inner partition 21 are separated, and the passage is opened, as shown in the partition flow path 53. The reciprocating motion of the piston driven by the shaft realizes the unidirectional conduction function of the partition assembly.

[0033] The piston assembly 1 performs reciprocating friction motion in the cylinder.

[0034] The right piston outlet plate 13 has the same distribution as the drain holes B14 of the piston outer ring 11, but is staggered with the drain holes 14 of the left piston inlet plate 12. In the piston assembly 1, when the piston shaft drives the piston assembly 1 to move to the left, as shown in FIG. Figure 3 As shown in the upper part, the piston outer ring 11 is pressed against the piston outlet plate 13 on the right side by the resistance of the cylinder sleeve. At this time, a gap is generated between the piston inlet plate 12 and the piston outer ring 11, forming a passage, and the gas can flow along the passage shown by the piston flow path 51; when the piston shaft 5 drives the piston assembly 1 to move to the right, as shown in FIG. Figure 3 As shown in the lower half, the piston outer ring 11 is forced toward the left piston inlet plate 12 by the resistance of the cylinder liner 4. The gap between the piston inlet plate 12 and the piston outer ring 11 is blocked, and the gas flow path is cut off, as shown by the piston blocking path 52, thereby achieving one-way on-off during the piston's reciprocating motion. This ingenious design precisely controls the flow direction of the fluid through the reciprocating motion of the piston, ensuring the reliable operation of the one-way valve.

[0035] Due to the increase in the number of flow channels, the resistance to gas movement in actual operation of this embodiment becomes smaller, which is suitable for high-speed operation of vacuum pumps, or can be expanded to application scenarios of air compressors, water pumps, oil pumps and other equipment, with wider applicability and higher performance advantages. Example 6

[0036] like Figure 5 and Figure 6 As shown, in this embodiment, the piston lateral rubber buffer 18 is an integral structure with the piston outer ring 11 and is disposed on the end of the piston outer ring 11 with the annular protrusion. The partition rubber buffer 28 is an integral structure with the inner partition 21 and is disposed on the end of the inner partition 21 with the annular protrusion. This example eliminates the independent lateral rubber buffer. Taking the cross-sectional view of the inner partition as an example, one side of the inner partition outer circular protrusion is provided with an integral partition drain groove, and the other side is provided with an integral partition sealing rib. The same principle applies to the piston outer ring.

[0037] At the same time, one of the partitions in the reciprocating pump is configured as a beveled partition 29. This beveled partition 29 cooperates with the end cap 3 to further optimize the one-way control performance of the one-way valve, ensuring cushioning and sealing effects while simplifying material usage. However, this integrated structure is more expensive in small-batch production and is more suitable for large-scale production scenarios, which can leverage economies of scale to reduce costs. Example 7

[0038] like Figure 7 As shown, the annular protrusion on the outer diameter surface of the inner partition is configured as a stepped structure, forming an inner partition shoulder to prevent the partition rubber buffer from entering the axial gap, thereby ensuring the normal working position and performance of the rubber buffer. The partition rubber buffer is located on both sides of the inner partition shoulder. The annular boss on the inner side of the piston outer ring is also configured as a stepped structure to form a piston outer ring shoulder to prevent the piston lateral rubber buffer from entering the axial gap, thereby ensuring the normal working position and performance of the rubber buffer. This embodiment also has a lateral rubber buffer belt drain groove and a guide structure. The lateral rubber buffers are located on both sides of the piston outer ring shoulder. The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A reciprocating pump inlet and exhaust check valve, characterized in that: It includes a sliding sealing surface, a retaining ring, a sealing ring and a buffer rubber, an inlet plate and an outlet plate; a sealing ring groove for installing the sealing ring and the sealing ring lining rubber is provided on the retaining ring; the sliding sealing surface and the retaining ring are slidably connected via the sealing ring; the other end of the retaining ring is accommodated in a groove, which is composed of an inlet plate and an outlet plate, a lateral buffer rubber structure is provided between the two radial surfaces of the inlet plate and the outlet plate, and a movement gap is retained, and a leakage hole is provided on the outlet plate.

2. A reciprocating pump intake and exhaust check valve according to claim 1, characterized in that: The one-way valve is of piston type, the retaining ring is the piston outer ring (11), the inlet plate is the piston inlet plate (12), the outlet plate is the piston outlet plate (13), and the sliding sealing surface is the inner wall of the cylinder; a piston ring groove for mounting a piston ring (16) and a piston ring lining rubber (17) is provided on the outer diameter surface of the piston outer ring (11); the other end of the piston outer ring (11) is accommodated in a groove formed between the piston inlet plate (12) and the piston outlet plate (13); and a piston side buffer rubber (18) is provided between the two axial surfaces of the piston outer ring (11) and the axial surface of the groove.

3. A reciprocating pump intake and exhaust check valve according to claim 1, characterized in that: The one-way valve is of a diaphragm type, the retaining ring is an inner diaphragm (21), the outflow plate is an outflow diaphragm (23), and the inflow plate is an inflow diaphragm (22); when used in a cylinder, the inner diaphragm (21), the outflow diaphragm (23) and the inflow diaphragm (22) are installed at both ends of the cylinder sleeve (4), and the sliding sealing surface is the piston shaft (5); the inner diameter surface of the inner diaphragm (21) is provided with a shaft sealing ring groove, and the shaft sealing ring groove is provided with a diaphragm sealing ring (26) and a diaphragm sealing ring lining rubber (27); the other end of the inner diaphragm (21) is installed in a groove formed between the inflow diaphragm (22) and the outflow diaphragm (23); and a diaphragm buffer rubber (28) is provided between the axial two surfaces of the inner diaphragm (21) and the axial surface of the groove.

4. A reciprocating pump intake and exhaust check valve according to claim 2, characterized in that: The piston side buffer rubber (18) and the piston outer ring (11) are of split structure.

5. A reciprocating pump intake and exhaust check valve according to claim 3, characterized in that: The partition plate buffer rubber (28) and the inner partition plate (21) are also split structures.

6. A reciprocating pump intake and exhaust check valve according to claim 1, characterized in that: The one-way valve is a combination of piston type and diaphragm type; The retaining ring is divided into a piston outer ring (11) and an inner baffle (21), the outflow plate is divided into a piston outflow plate (13) and an outflow baffle (23), and the inflow plate is divided into a piston inflow plate (12) and an inflow baffle (22); A piston ring groove for mounting a piston ring (16) and a piston ring lining rubber (17) is provided on the outer diameter surface of the piston outer ring (11); the other end of the piston outer ring (11) is accommodated in a groove formed between the piston inlet plate (12) and the piston outlet plate (13); a piston side buffer rubber (18) is provided between the two axial surfaces of the piston outer ring (11) and the axial surface of the groove; When used in a cylinder, both ends of the cylinder sleeve (4) are equipped with an inner baffle (21), an outflow baffle (23) and an inflow baffle (22), and the sliding sealing surface is the piston shaft (5); the inner diameter surface of the inner baffle (21) is provided with a shaft sealing ring groove, and the shaft sealing ring groove is provided with a baffle sealing ring (26) and a baffle sealing ring lining rubber (27); the other end of the inner baffle (21) is installed in the groove formed between the inflow baffle (22) and the outflow baffle (23); baffle buffer rubber (28) is provided between the axial two surfaces of the inner baffle (21) and the axial surface of the groove; the piston outer ring (11) is arranged between the two inner baffles (21).

7. A reciprocating pump intake and exhaust check valve according to claim 6, characterized in that: The number of drainage holes in the retaining ring, the outlet plate and the inlet plate is increased; the protrusion length of the retaining ring is increased.

8. A reciprocating pump intake and exhaust check valve according to claim 2 or 6, characterized in that: The piston side buffer rubber (18) and the piston outer ring (11) are an integrated structure, and the piston side buffer rubber (18) is arranged on one end of the piston outer ring (11) with an annular protrusion.

9. A reciprocating pump intake and exhaust check valve according to claim 3 or 6, characterized in that: The partition plate buffer rubber (28) and the inner partition plate (21) are an integrated structure, and the partition plate buffer rubber (28) is arranged at one end of the inner partition plate (21) with the annular protrusion.

10. The reciprocating pump intake and exhaust check valve according to claim 6, characterized in that: A piston outer ring step (37) is provided on the inner protrusion of the piston outer ring (11) for preventing the piston lateral buffer rubber (18) from being embedded in the axial gap; an inner partition step (38) is provided on the outer protrusion of the inner partition (21) for preventing the partition buffer rubber (28) from being embedded in the axial gap.

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