Pump body assembly and compressor

Abstract

The invention provides a pump body assembly and a compressor, the pump body assembly comprises an air cylinder, a piston and an air suction sheet; a compression cavity is formed in the air cylinder, and the piston reciprocates in the compression cavity; the air suction piece is installed on the air cylinder and covers the compression cavity. A vent groove is formed in the end face of the piston, the projection contour line of the air suction piece exhaust port on the end face of the piston is located in the vent groove, one end of the vent groove extends to the outer circle of the piston, and the other end of the vent groove is communicated with the air suction piece exhaust port. And air near the inner wall surface of the compression cavity flows to the exhaust port of the air suction sheet through the vent groove. According to the vent groove, by providing a larger flow area and a more effective exhaust path, the exhaust resistance is reduced, and high-pressure gas can be smoothly exhausted within a shorter time.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of compressors, and particularly relates to a pump body assembly and a compressor. BACKGROUND

[0002] During the operation of a piston compressor, the piston moves linearly in the cylinder, the general exhaust direction of the high-pressure gas in the cylinder is consistent with the movement direction of the piston, and is perpendicular to the piston end face and points to the valve seat exhaust port, at this time, the minimum exhaust flow area is the cross-sectional area of the valve seat exhaust port; during the process of the piston moving to the near top dead center position, the linear distance between the piston and the exhaust port is reduced to tens of microns, at this time, the general exhaust direction of the high-pressure gas in the cylinder is perpendicular to the movement direction of the piston and is parallel to the piston end face and points to the valve seat exhaust port from the cylinder wall, at this time, the minimum flow area becomes the product of the linear distance between the piston and the valve seat exhaust port and the perimeter of the valve seat exhaust port, which is much smaller than the cross-sectional area of the valve seat exhaust port, as the linear distance between the piston and the valve seat exhaust port decreases, the minimum exhaust flow area becomes smaller and smaller, the exhaust resistance of the high-pressure gas in the cylinder becomes larger and larger, the gas pressure becomes higher and higher, and over-compression occurs, especially at high frequency, the time required for discharging the high-pressure gas in the cylinder per unit volume is reduced, the exhaust resistance is further increased, the high pressure in the cylinder is higher, and the over-compression condition is more serious, resulting in increased power consumption of the compressor and reduced cooling capacity. SUMMARY

[0003] The application provides a pump body assembly and a compressor, which can solve the technical problem that the linear distance between the piston and the valve seat exhaust port is reduced, the minimum exhaust flow area becomes smaller and smaller, the exhaust resistance of the high-pressure gas in the cylinder becomes larger and larger, the gas pressure becomes higher and higher, and over-compression occurs.

[0004] The application provides a pump body assembly, which comprises a cylinder, a piston and a suction blade.

[0005] A compression cavity is formed in the cylinder, and the piston reciprocates in the compression cavity; the suction blade is installed on the cylinder, and covers the compression cavity.

[0006] The suction blade is provided with a suction blade exhaust port, the end face of the piston is provided with a ventilation groove, the projection contour line of the suction blade exhaust port on the piston end face is located in the ventilation groove, one end of the ventilation groove extends to the outer circle of the piston, and the other end of the ventilation groove is in communication with the suction blade exhaust port, so that the gas near the inner wall of the compression cavity flows to the suction blade exhaust port through the ventilation groove.

[0007] In some embodiments, the vent groove comprises a communication groove and a guide groove, both of which are formed on the end face of the piston, the projection contour of the air inlet fin exhaust port on the end face of the piston is located in the communication groove, and the communication groove is in communication with the air inlet fin exhaust port in the axial direction of the piston; one end of the guide groove is in communication with the communication groove, and the other end of the guide groove extends to the outer circle of the piston and penetrates through the outer circle of the piston.

[0008] In some embodiments, the vent groove further comprises a chamfer groove, the chamfer groove is formed around the outer circle of the piston, and one end of the guide groove away from the communication groove is in communication with the chamfer groove.

[0009] In some embodiments, when the communication groove is concentrically arranged with the center of the end face of the piston, a plurality of guide grooves are formed along the circumference of the end face of the piston, one end of each of the plurality of guide grooves is in communication with the communication groove, and the other end of each of the plurality of guide grooves extends to the outer circle of the piston and penetrates through the outer circle of the piston.

[0010] In some embodiments, the vent groove further comprises a ring groove, the ring groove is formed on the end face of the piston, the ring groove is concentrically arranged with the communication groove with the end face of the piston as the projection plane, the ring groove is located on the radial outer side of the communication groove, and each of the plurality of guide grooves intersects with the ring groove.

[0011] In some embodiments, when the communication groove is eccentrically formed on the end face of the piston, a first side of the communication groove is close to the outer circle of the piston, and a second side of the communication groove is away from the outer circle of the piston; a plurality of guide grooves are formed along the circumference of the end face of the piston, each of the plurality of guide grooves is located on the second side of the communication groove, one end of each of the plurality of guide grooves is in communication with the communication groove, and the other end of each of the plurality of guide grooves extends to the outer circle of the piston and penetrates through the outer circle of the piston.

[0012] In some embodiments, the vent groove further comprises an arc-shaped groove, the arc-shaped groove is located on the second side of the communication groove, the arc-shaped groove is concentrically arranged with the communication groove, both ends of the arc-shaped groove extend to the outer circle of the piston and penetrate through the outer circle of the piston, and each of the plurality of guide grooves intersects with the arc-shaped groove.

[0013] In some embodiments, when two air inlet fin exhaust ports are symmetrically arranged on the air inlet fin, two communication grooves are symmetrically formed on the end face of the piston, and the projection contour of the air inlet fin exhaust port on the end face of the piston is respectively located in the communication groove.

[0014] The air guide groove comprises a first straight groove and a second straight groove, two ends of the first straight groove are communicated with the two communication grooves respectively, and the center of the piston end face is located on the first straight groove; the second straight groove intersects the first straight groove perpendicularly, and two ends of the second straight groove extend to the outer circle of the piston and penetrate through the outer circle of the piston respectively.

[0015] In some embodiments, the two communication grooves are eccentrically arranged on the end face of the piston, the first side of the communication groove is close to the outer circle of the piston, and the second side of the communication groove is away from the outer circle of the piston; the air guide groove further comprises two arc grooves, the two arc grooves are symmetrically arranged about the first straight groove, two ends of the arc groove are communicated with the second side of the two communication grooves respectively, and the two arc grooves intersect the second straight groove.

[0016] In some embodiments, the air guide groove further comprises two third straight grooves, the third straight grooves are arranged correspondingly with the communication grooves, one end of the third straight groove is communicated with the first side of the communication groove, and the other end of the third straight groove extends to the outer circle of the piston and penetrates through the outer circle of the piston respectively.

[0017] In some embodiments, when three air suction piece exhaust ports are arranged on the air suction piece, three communication grooves are arranged on the end face of the piston, and the projection contour lines of the air suction piece exhaust ports on the end face of the piston are located in the communication grooves respectively.

[0018] The air guide groove further comprises a ring groove, the ring groove is arranged on the end face of the piston, the end face of the piston is taken as a projection plane, the ring groove is arranged concentrically with the center of the piston end face, three communication grooves are arranged on the arc segment of the ring groove, and the ring groove intersects the air guide groove.

[0019] In some embodiments, the air guide groove comprises a first straight groove and a second straight groove, one end of the first straight groove is communicated with the communication groove at the middle position, the other end of the first straight groove extends to the outer circle of the piston and penetrates through the outer circle of the piston, the center of the piston end face is located on the first straight groove, and the ring groove intersects the first straight groove; one end of the second straight groove is communicated with the side of the communication groove away from the first straight groove, the other end of the second straight groove extends to the outer circle of the piston and penetrates through the outer circle of the piston, and the second straight groove is located on the extension line of the first straight groove.

[0020] In some embodiments, the venting groove further comprises two arc-shaped grooves, the two arc-shaped grooves are symmetrically arranged with respect to the first straight groove, two ends of the arc-shaped groove respectively extend to and penetrate the outer circle of the piston, the two arc-shaped grooves respectively intersect with the two communication grooves on the two sides, and the two arc-shaped grooves both intersect with the ring groove.

[0021] In some embodiments, when the suction vane is provided with a special-shaped suction vane exhaust port, the communication groove matched with the suction vane exhaust port is arranged on the end face of the piston, and the projection contour line of the special-shaped suction vane exhaust port on the end face of the piston is located in the communication groove.

[0022] The venting groove further comprises an arc-shaped groove, the arc-shaped groove is arranged on the end face of the piston, the end face of the piston is taken as a projection plane, the arc-shaped groove is concentrically arranged with the center of the end face of the piston, two ends of the arc-shaped groove respectively communicate with the communication grooves, and the arc-shaped groove intersects with the gas guide groove.

[0023] In some embodiments, the special-shaped suction vane exhaust port is eccentrically arranged on the end face of the piston, the gas guide groove comprises a first straight groove and a plurality of second straight grooves, one end of the first straight groove communicates with the suction vane exhaust port, the other end of the first straight groove intersects with the arc-shaped groove, and the center of the end face of the piston is located on the first straight groove; the plurality of second straight grooves are arranged along the circumferential direction of the arc-shaped groove, one end of the second straight groove intersects with the arc-shaped groove, and the other end of the second straight groove extends to and penetrates the outer circle of the piston.

[0024] In some embodiments, the piston comprises a piston body and a mounting piece, the mounting piece is arranged on the top end of the piston body, the mounting piece is provided with a venting groove away from the end face of the piston, one end of the venting groove extends to the outer circle of the mounting piece, and the other end of the venting groove communicates with the suction vane exhaust port.

[0025] A compressor comprising a pump body assembly, the pump body assembly is the pump body assembly described above.

[0026] The pump body assembly and the compressor provided by the application have the following beneficial effects:

[0027] In the present application, the vent groove extends to the outer circle of the piston at one end, close to the inner wall of the compression chamber, which can effectively collect the high-pressure gas flowing along the inner wall of the compression chamber and guide it into the vent groove, avoiding the accumulation of gas near the wall, reducing the exhaust efficiency. The vent groove avoids the area directly impacted by the piston end face and the valve plate, preventing the vent groove from being worn or deformed due to the high-speed impact of the gas, affecting its flow guiding performance. The other end of the vent groove is aligned with the exhaust port of the suction plate, ensuring that the gas can accurately flow from the end of the vent groove into the exhaust port of the suction plate, avoiding gas leakage or flow short circuit, improving the sealing and efficiency of the exhaust.

[0028] In the present application, when the piston approaches the top dead center, the distance between the piston and the exhaust port of the valve seat is reduced to microns, at this time the minimum flow area of the exhaust is only the product of the circumference of the exhaust port of the valve seat and the micron-level gap, resulting in a large throttling resistance. When high-pressure gas passes through such a small gap, the speed increases sharply and the pressure loss is significant, which easily leads to over-compression. The setting of the vent groove changes the exhaust path from the traditional valve port gap to the combined path of the vent groove and the exhaust port. One end of the vent groove extends to the outer circle of the piston, and the other end is connected to the exhaust port of the suction plate, with a cross-sectional area much larger than the flow area provided by the micron-level gap, thereby significantly increasing the effective flow area of the exhaust. This setting reduces the flow rate of the gas during the exhaust process and the corresponding throttling resistance, reduces the pressure loss, and alleviates the over-compression phenomenon caused by the throttling effect. The vent groove provides a larger flow area and a more effective exhaust path, reducing the exhaust resistance, allowing high-pressure gas to be smoothly discharged in a shorter time, which effectively alleviates the over-compression phenomenon and reduces the energy loss caused by over-compression. Under high-frequency operating conditions, this effect is more pronounced, which can significantly improve the efficiency and performance of the compressor. The traditional exhaust path is a two-dimensional planar flow, with the gas vertically impacting the valve port, resulting in large flow loss and low exhaust efficiency. The vent groove changes the exhaust path to a three-dimensional flow pattern, with the gas entering the vent groove from the cylinder wall and finally flowing into the exhaust port of the suction plate. This three-dimensional flow pattern makes full use of the space in the compression chamber, allowing the gas to be discharged more efficiently and improving the exhaust efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only exemplary, and those skilled in the art can also obtain other implementation drawings based on the provided drawings without creating any creative labor.

[0030] Figure 1 A schematic view of the pump body assembly of the present application;

[0031] Figure 2A sectional view of a pump body assembly according to an embodiment of the present application;

[0032] Figure 3 A schematic view of a vent groove according to an embodiment of the present application;

[0033] Figure 4 A schematic view of a vent groove according to an embodiment of the present application, when the vent groove is concentrically arranged with the center of the end face of the piston;

[0034] Figure 5 A schematic view of a vent groove according to an embodiment of the present application, when the vent groove is eccentrically arranged on the end face of the piston;

[0035] Figure 6 A schematic view of a vent groove according to an embodiment of the present application, when two vent grooves are symmetrically arranged on the end face of the piston;

[0036] Figure 7 A schematic view of a vent groove according to an embodiment of the present application, when three vent grooves are arranged on the end face of the piston;

[0037] Figure 8 A schematic view of a vent groove according to an embodiment of the present application, when a special-shaped vent groove matching the exhaust port of the suction vane is arranged on the end face of the piston;

[0038] Figure 9 A schematic view of the performance coefficient of a pump body assembly according to an embodiment of the present application;

[0039] Figure 10 A schematic view of the structure of a piston body and a mounting plate according to an embodiment of the present application.

[0040] FIG. 1 is a cylinder; 101 is a compression chamber; 2 is a piston; 201 is a piston body; 202 is a mounting plate; 3 is a suction vane; 301 is an exhaust port of the suction vane; 4 is a vent groove; 401 is a vent groove; 402 is a guide groove; 421 is a first straight groove; 422 is a second straight groove; 423 is a third straight groove; 403 is a chamfer groove; 404 is a ring groove; 405 is an arc-shaped groove; 5 is a cylinder head; 6 is a valve seat exhaust port. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative work, fall within the scope of protection of the present application.

[0042] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0043] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures.

[0044] For reference Figures 1 to 3 As shown, according to the embodiment of the present application, a pump body assembly is provided, which comprises a cylinder 1, a piston 2 and a suction blade 3; the cylinder 1 is provided with a compression chamber 101, and the piston 2 reciprocates in the compression chamber 101; the suction blade 3 is installed on the cylinder 1, and covers the compression chamber 101; the suction blade 3 is provided with a suction blade exhaust port 301, the end face of the piston 2 is provided with a ventilation groove 4, the projection contour line of the suction blade exhaust port 301 on the end face of the piston 2 is located in the ventilation groove 4, one end (intake end) of the ventilation groove 4 extends to the outer circle of the piston 2, and the other end (terminal end) of the ventilation groove 4 communicates with the suction blade exhaust port 301, so that the gas near the inner wall surface of the compression chamber 101 flows to the suction blade exhaust port 301 through the ventilation groove 4.

[0045] It is worth noting that the cylinder 1 is provided with a cylinder cover 5, the suction blade 3 is fixed between the cylinder cover 5 and the compression chamber 101, the cylinder cover 5 is provided with a valve seat exhaust port 6, the valve seat exhaust port 6 is coaxially arranged with the suction blade exhaust port 301, and the suction blade exhaust port 301 is also arranged to conduct between the compression chamber 101 and the valve seat exhaust port 6, so that the compressed high-pressure gas can be discharged from the suction blade exhaust port 301 and the valve seat exhaust port 6 in turn. When the piston 2 moves to the position close to the top dead center, the high-pressure gas does not vertically discharge from the suction blade exhaust port 301 but adheres to the area near the inner wall surface of the compression chamber 101 and discharges along the wall surface, and the exhaust resistance of the high-pressure gas in the cylinder 1 becomes larger and larger.

[0046] Specifically, the high-pressure gas no longer directly vertically impacts the suction vane exhaust port 301, but forms a boundary layer flow (parallel to the piston 2 end face and the cylinder 1 wall surface) near the inner wall surface of the compression chamber 101. At this time, the micron-level gap between the piston 2 and the valve seat exhaust port 6 causes the valve port throttling effect to be extremely strong, and the wall surface area becomes a low-pressure channel due to viscous resistance, guiding the gas to flow tangentially along the wall surface. Since one end of the vent groove 4 extends to the outer circle of the piston 2, and the other end of the vent groove 4 is in communication with the suction vane exhaust port 301, the gas enters the vent groove 4 from the inner wall surface of the compression chamber 101 to the end face of the piston 2, flows radially inward along the groove, and the gas is radially collected from the end of the vent groove 4 into the suction vane exhaust port 301, and then discharged through the coaxial valve seat exhaust port 6.

[0047] In this embodiment, one end of the vent groove 4 extends to the outer circle of the piston 2, near the inner wall surface of the compression chamber 101, which can effectively collect the high-pressure gas flowing along the inner wall surface of the compression chamber 101, guide it into the vent groove 4, avoid the accumulation of gas near the wall surface, and reduce the exhaust efficiency. The vent groove 4 avoids the area directly impacted by the piston 2 end face and the valve plate, preventing the vent groove 4 from being worn or deformed due to the high-speed impact of the gas, affecting its flow guiding performance. The other end of the vent groove 4 is aligned in communication with the suction vane exhaust port 301, ensuring that the gas can accurately flow from the end of the vent groove 4 into the suction vane exhaust port 301, avoiding gas leakage or flow short circuit, and improving the sealing and efficiency of the exhaust.

[0048] In this embodiment, when piston 2 approaches top dead center, the distance between piston 2 and valve seat exhaust port 6 decreases to the micrometer level. At this point, the minimum flow area for exhaust is only the product of the circumference of valve seat exhaust port 6 and the micrometer-level gap, resulting in extremely high throttling resistance. When high-pressure gas passes through such a small gap, its velocity increases sharply, and the pressure loss is significant, easily leading to overcompression. The venting groove 4 transforms the exhaust path from the traditional valve port gap to a composite path of venting groove 4 and exhaust port. One end of venting groove 4 extends to the outer circle of piston 2, and the other end connects to the exhaust port 301 of the intake plate. Its cross-sectional area is much larger than the flow area provided by the micrometer-level gap, thereby significantly increasing the effective flow area for exhaust. This design reduces the gas velocity and corresponding throttling resistance during the exhaust process, reduces pressure loss, and alleviates the overcompression phenomenon caused by the throttling effect. The venting groove 4, by providing a larger flow area and a more efficient exhaust path, reduces exhaust resistance, allowing high-pressure gas to be discharged smoothly in a shorter time. This effectively alleviates overcompression and reduces energy loss caused by overcompression. This effect is even more significant under high-frequency operating conditions, significantly improving the compressor's efficiency and performance. Traditional exhaust paths involve two-dimensional planar flow, with gas impacting the valve port vertically, resulting in large flow losses and low exhaust efficiency. The venting groove 4, through its three-dimensional geometric design, transforms the exhaust path into a three-dimensional guiding mode. After entering the venting groove 4 from the cylinder 1 wall, the gas ultimately flows into the intake plate exhaust port 301. This three-dimensional guiding method fully utilizes the space of the compression chamber 101, enabling more efficient gas discharge and improving exhaust efficiency. (See also...) Figure 9 As shown, the ventilation slot 4 increases the exhaust cross-sectional area, reduces exhaust resistance, reduces compression power consumption, and improves the performance of the piston 2 compressor across the entire frequency band, especially the high-frequency energy efficiency, with the performance coefficient nearly increasing by 3 percentage points.

[0049] See also Figures 1 to 3 As shown, the venting groove 4 includes a connecting groove 401 and a guiding groove 402. Both the connecting groove 401 and the guiding groove 402 are formed on the end face of the piston 2. The projection outline of the intake plate exhaust port 301 on the end face of the piston 2 is located in the connecting groove 401. In the axial direction of the piston 2, the connecting groove 401 is connected to the intake plate exhaust port 301. One end of the guiding groove 402 is connected to the connecting groove 401, and the other end of the guiding groove 402 extends towards the outer circle of the piston 2 and penetrates the outer circle of the piston 2. The cross-sectional shape of the venting groove 4 is semi-circular, trapezoidal, or rectangular. The width of the venting groove 4 is b, and the radius of the piston 2 is R. It is required that b ≤ R / 2. The depth of the venting groove 4 is a. The projected area of ​​the venting groove 4 along the movement direction of the piston 2 is S1. The displacement of the piston 2 compressor is S2. It is required that a*S1 ≤ S2 / 10.

[0050] Specifically, due to the strong valve port throttling effect, the area near the inner wall surface of the compression chamber 101 has relatively low viscous resistance, forming a low-pressure channel, and the high-pressure gas tends to flow along the boundary layer along the inner wall surface of the compression chamber 101, and the flow direction is parallel to the end surface of the piston 2 and the wall surface of the cylinder 1. When the high-pressure gas flows along the inner wall surface of the compression chamber 101 to the end surface of the piston 2, it enters the gas guide groove 402 opened on the end surface of the piston 2. One end of the gas guide groove 402 communicates with the communication groove 401, and the other end extends to the outer circle of the piston 2 and penetrates the outer circle of the piston 2. After the gas enters the gas guide groove 402, it flows along the gas guide groove 402 from the outer circle of the piston 2 to the communication groove 401. The gas guide groove 402 guides the gas from the inner wall surface of the compression chamber 101 to the communication groove 401. When the gas flows to the communication groove 401, it enters the communication groove 401. The communication groove 401 communicates with the suction blade exhaust port 301 in the axial direction of the piston 2. The projection profile line of the suction blade exhaust port 301 on the end surface of the piston 2 is located in the communication groove 401. The gas flows in the communication groove 401 and finally reaches the suction blade exhaust port 301. Then, the gas is discharged through the suction blade exhaust port 301 and the coaxial valve seat exhaust port 6.

[0051] In this embodiment, the communication groove 401 serves as a converging area for gas flow, converging the gas guided from the gas guide groove 402 together and providing a transition space for the gas from the gas guide groove 402 to the suction blade exhaust port 301. The communication groove 401 communicates with the suction blade exhaust port 301, which can reduce the resistance of the gas entering the suction blade exhaust port 301, so that the gas can flow more smoothly into the exhaust port. The communication groove 401 communicates with the suction blade exhaust port 301 in the axial direction of the piston 2, which ensures that the gas can efficiently enter the suction blade exhaust port 301 from the communication groove 401 and then be discharged through the valve seat exhaust port 6. The main function of the gas guide groove 402 is to guide the high-pressure gas near the inner wall surface of the compression chamber 101, collect it from the wall surface of the cylinder 1 and guide it to the communication groove 401. One end of the gas guide groove 402 communicates with the communication groove 401, and the other end penetrates the outer circle of the piston 2 and is close to the inner wall surface of the compression chamber 101, which can effectively collect the gas flowing along the wall surface. The provision of the gas guide groove 402 can reduce the flow loss of the gas flowing along the wall surface. By providing a clear flow path, the gas guide groove 402 avoids the formation of disordered motion and vortex during the flow process, reduces energy loss, and guides the gas to the communication groove 401, avoiding the direct impact of the gas on the edge of the suction blade exhaust port 301 or the valve seat exhaust port 6, reducing the wear and energy loss caused by high-speed impact.

[0052] In this embodiment, the gas guide groove 402 extends inwardly from the outer circle of the piston 2 and communicates with the communication groove 401. The geometry (such as width, depth, length) of the gas guide groove 402 is configured for efficient collection of high-pressure gas near the inner wall surface of the compression chamber 101. The communication groove 401 is located on the end face of the piston 2 and is aligned with the projected outline of the air suction blade exhaust port 301, providing a direct channel from the gas guide groove 402 to the air suction blade exhaust port 301. The shape and size of the communication groove 401 are optimized for gas convergence and transition. The gas guide groove 402 and the communication groove 401 together form a complete exhaust path from the inner wall surface of the compression chamber 101 to the air suction blade exhaust port 301. The gas guide groove 402 is responsible for guiding the gas to the communication groove 401, and the communication groove 401 ensures smooth entry of the gas into the air suction blade exhaust port 301, forming an efficient exhaust channel. The arrangement of the gas guide groove 402 allows the gas to flow tangentially from the wall surface of the cylinder 1 into the groove, reducing flow loss and avoiding energy waste. The combined arrangement of the gas guide groove 402 and the communication groove 401 makes the gas flow path smoother, reduces flow resistance, reduces energy loss, and improves exhaust efficiency. The synergistic effect of the communication groove 401 and the gas guide groove 402 significantly optimizes the exhaust path, reduces exhaust resistance, reduces over-compression phenomenon, improves exhaust efficiency, and enhances the reliability and service life of the compressor. The gas guide groove 402 is responsible for collecting and guiding the gas, and the communication groove 401 is responsible for converging and transitioning the gas. Together, they enable efficient and low-resistance discharge of high-pressure gas from the inner wall surface of the compression chamber 101, ultimately through the air suction blade exhaust port 301 and the valve seat exhaust port 6. This synergistic effect is crucial for the efficient operation and performance improvement of the compressor.

[0053] For reference Figures 1 to 3 As shown, the vent groove 4 also includes a chamfer groove 403, which is formed around the outer circle of the piston 2. The end of the gas guide groove 402 opposite the communication groove 401 communicates with the chamfer groove 403.

[0054] Specifically, when the high-pressure gas flows along the inner wall surface of the compression chamber 101 to the end surface of the piston 2, it first enters the chamfer groove 403 around the outer circle of the piston 2. The chamfer groove 403 is provided to enable the gas to more smoothly transition from the inner wall surface of the compression chamber 101 to the end surface of the piston 2. The gas flowing out of the chamfer groove 403 enters the gas guide groove 402, one end of which communicates with the chamfer groove 403, and the other end of which extends toward the inside of the piston 2 and communicates with the communication groove 401. The gas flows along the gas guide groove 402 from the vicinity of the outer circle of the piston 2 inward, gradually approaching the communication groove 401. When the gas flows to the communication between the gas guide groove 402 and the communication groove 401, it enters the communication groove 401, which communicates with the suction blade exhaust port 301 in the axial direction of the piston 2. The projection profile line of the suction blade exhaust port 301 on the end surface of the piston 2 is located in the communication groove 401. The gas flows in the communication groove 401 and finally reaches the suction blade exhaust port 301. Subsequently, the gas is discharged through the suction blade exhaust port 301 and the coaxial valve seat exhaust port 6.

[0055] For reference Figures 1 to 4 As shown in FIG. 1, as a first specific example, when the communication groove 401 is concentrically arranged with the center of the end surface of the piston 2, a plurality of gas guide grooves 402 are arranged along the circumference of the end surface of the piston 2. One end of each of the plurality of gas guide grooves 402 communicates with the communication groove 401, and the other end of each of the plurality of gas guide grooves 402 extends toward the outer circle of the piston 2 and penetrates the outer circle of the piston 2.

[0056] Specifically, when the high-pressure gas flows along the inner wall surface of the compression chamber 101 to the end surface of the piston 2, it enters the plurality of gas guide grooves 402 arranged along the circumference of the end surface of the piston 2. One end of each of the plurality of gas guide grooves 402 communicates with the communication groove 401, and the other end of each of the plurality of gas guide grooves 402 extends toward the outer circle of the piston 2 and penetrates the outer circle of the piston 2. After the gas enters the gas guide groove 402, it flows along the gas guide groove 402 from the vicinity of the outer circle of the piston 2 toward the communication groove 401. The plurality of gas guide grooves 402 are uniformly distributed on the end surface of the piston 2, ensuring that the gas can be uniformly collected from different positions of the inner wall surface of the compression chamber 101 and guided to the communication groove 401. When the gas flows to the communication between the gas guide groove 402 and the communication groove 401, it enters the communication groove 401, which is concentrically arranged with the center of the end surface of the piston 2, ensuring that the gas can be uniformly gathered in the communication groove 401. The gas flows in the communication groove 401 and finally reaches the suction blade exhaust port 301. Subsequently, the gas is discharged through the suction blade exhaust port 301 and the coaxial valve seat exhaust port 6. The projection profile line of the communication groove 401 and the suction blade exhaust port 301 on the end surface of the piston 2 coincides, ensuring that the gas can flow smoothly into the suction blade exhaust port 301.

[0057] In the embodiment, the communication groove 401 is concentrically arranged with the center of the end face of the piston 2, forming an efficient gas collection center. The central symmetry of the communication groove 401 allows the gas to be collected and discharged uniformly from all directions. This symmetrical arrangement ensures that the gas converges uniformly from all directions into the communication groove 401, avoiding excessive concentration of local flow and improving the uniformity and stability of the exhaust. The plurality of gas guide grooves 402 are uniformly distributed along the circumference of the end face of the piston 2, ensuring that the gas can be uniformly collected from different positions on the inner wall surface of the compression chamber 101 and guided to the communication groove 401. This distribution improves the efficiency and uniformity of the exhaust, making the gas flow smoother. The arrangement of the gas guide grooves 402 allows the gas to flow into the grooves tangentially from the vicinity of the wall surface of the cylinder 1, avoiding direct impact of the gas on the edge of the valve port and reducing flow loss and the formation of local vortex. The shape and size of the communication groove 401 are optimized to reduce the resistance of the gas entering the suction blade exhaust port 301, allowing the gas to flow more smoothly into the exhaust port. Through the synergistic effect of the gas guide grooves 402 and the communication groove 401, high-pressure gas can be discharged in a timely manner, reducing the exhaust resistance and over-compression power consumption and improving the efficiency of the compressor. The gas guide grooves 402 timely guide the high-pressure gas near the inner wall surface of the compression chamber 101 to the communication groove 401, avoiding the accumulation of gas near the wall surface and reducing the over-compression phenomenon caused by gas accumulation.

[0058] For reference Figures 1 to 4 As shown in the figure, the vent groove 4 also includes a ring groove 404, which is opened on the end face of the piston 2. With the end face of the piston 2 as the projection plane, the ring groove 404 is concentrically arranged with the communication groove 401. The ring groove 404 is located radially outside the communication groove 401, and the plurality of gas guide grooves 402 intersect the ring groove 404.

[0059] Specifically, when the high-pressure gas flows along the inner wall of the compression chamber 101 towards the end face of the piston 2, it enters the plurality of gas guide grooves 402 that are circumferentially arranged on the end face of the piston 2. One end of each gas guide groove 402 is in communication with the ring groove 404, and the other end extends to the outer circle of the piston 2 and penetrates through the outer circle of the piston 2. After entering the gas guide groove 402, the gas flows along the gas guide groove 402 from the vicinity of the outer circle of the piston 2 towards the ring groove 404. The plurality of gas guide grooves 402 are uniformly distributed on the end face of the piston 2, ensuring that the gas can be uniformly collected from different positions on the inner wall of the compression chamber 101 and guided to the ring groove 404. When the gas flows to the communication position of the gas guide groove 402 and the ring groove 404, it enters the ring groove 404. The ring groove 404 is arranged on the end face of the piston 2 and is concentric with the communication groove 401, located radially outside the communication groove 401. The gas flows circumferentially in the ring groove 404 and finally enters the communication groove 401 through the communication position between the ring groove 404 and the communication groove 401. The arrangement of the ring groove 404 enables the gas to be more uniformly distributed and flow into the communication groove 401. After entering the communication groove 401, the gas flows towards the suction blade exhaust port 301. The projection profile of the communication groove 401 on the end face of the piston 2 coincides with the suction blade exhaust port 301, ensuring smooth flow of the gas into the suction blade exhaust port 301.

[0060] In this embodiment, the ring groove 404 serves as an intermediate buffer area for gas flow, enabling the gas to be more uniformly distributed before entering the communication groove 401. This avoids the local flow concentration caused by the direct communication between the gas guide groove 402 and the communication groove 401, reduces the impact and flow loss when the gas enters the communication groove 401, and optimizes the gas flow path. The ring groove 404 is concentrically arranged with the communication groove 401, providing a clear flow direction guide for the gas, enabling the gas to flow more smoothly from the ring groove 404 into the communication groove 401, and reducing the flow resistance. The ring groove 404 extends circumferentially on the end face of the piston 2, and the plurality of gas guide grooves 402 intersect with the ring groove 404. This arrangement enables the gas to enter the ring groove 404 uniformly in the circumferential direction and then flow uniformly into the communication groove 401, improving the uniformity of the exhaust. The arrangement of the ring groove 404 avoids the local flow concentration caused by the direct guidance of the gas guide groove 402 to a certain point of the communication groove 401, making the gas flow in the communication groove 401 more uniform and reducing the formation of local eddy currents. The ring groove 404 provides an additional flow path for the gas, avoiding the accumulation of gas at the communication position between the gas guide groove 402 and the communication groove 401, reducing the over-compression phenomenon caused by gas accumulation, and improving the collection efficiency of the gas. The ring groove 404 can more effectively collect gas from different gas guide grooves 402 and guide it to the communication groove 401, ensuring that more high-pressure gas can be smoothly discharged.

[0061] As a specific embodiment, at least four air guide grooves 402 are provided, and the included angle between adjacent air guide grooves 402 is ≤90°, and the diameter of the ring groove 404 is <0.8*the diameter of the outer circle of the piston 2.

[0062] For reference Figures 1 to 5 As shown, as a specific second embodiment, when the communication groove 401 is eccentrically arranged on the end face of the piston 2, the first side of the communication groove 401 is close to the outer circle of the piston 2, and the second side of the communication groove 401 is away from the outer circle of the piston 2; a plurality of air guide grooves 402 are arranged along the circumference of the end face of the piston 2, the plurality of air guide grooves 402 are located on the second side of the communication groove 401, one end of the plurality of air guide grooves 402 is communicated with the communication groove 401, and the other end of the plurality of air guide grooves 402 respectively extends to the outer circle of the piston 2 and penetrates the outer circle of the piston 2.

[0063] Specifically, the communication groove 401 is arranged eccentrically relative to the center of the end face of the piston 2, and when the high-pressure gas flows along the inner wall of the compression chamber 101 to the end face of the piston 2, it enters the plurality of air guide grooves 402 arranged along the circumference of the end face of the piston 2. These air guide grooves 402 are located on the second side of the communication groove 401, one end of which is communicated with the communication groove 401, and the other end of which extends to the outer circle of the piston 2 and penetrates the outer circle of the piston 2. After the gas enters the air guide groove 402, it flows along the air guide groove 402 from the vicinity of the outer circle of the piston 2 to the second side of the communication groove 401, and the plurality of air guide grooves 402 are uniformly distributed on the second side of the communication groove 401, which ensures that the gas can be uniformly collected from different positions of the inner wall of the compression chamber 101 and guided to the communication groove 401. When the gas flows to the communication between the air guide groove 402 and the communication groove 401, it enters the communication groove 401. Since the communication groove 401 is arranged eccentrically, its first side is close to the outer circle of the piston 2, and its second side is away from the outer circle of the piston 2. This arrangement allows the gas to converge from the second side of the communication groove 401 and flow to the first side. After the gas enters the communication groove 401, it flows along the communication groove 401 to the first side and finally reaches the suction blade exhaust port 301. The eccentric arrangement of the communication groove 401 allows the gas to flow more smoothly to the suction blade exhaust port 301, reducing the flow resistance. The gas is discharged through the suction blade exhaust port 301 and the coaxial valve seat exhaust port 6.

[0064] In this embodiment, the communication groove 401 is eccentrically arranged, with the first side close to the outer circle of the piston 2 and the second side away from the outer circle of the piston 2. This arrangement allows gas to converge from the second side of the communication groove 401 and flow to the first side, and finally to the suction blade exhaust port 301. The eccentric arrangement optimizes the exhaust path, making the gas flow smoother. The eccentric communication groove 401 arrangement makes the gas flow path shorter in the communication groove 401, reducing flow loss and reducing exhaust resistance. The eccentric arrangement of the communication groove 401 helps to more efficiently collect and guide gas, ensuring that the gas can be timely discharged, improving the exhaust efficiency. Multiple gas guide grooves 402 are evenly distributed along the circumference of the end surface of the piston 2, ensuring that gas can be uniformly collected from different positions on the inner wall surface of the compression chamber 101. This uniform distribution arrangement improves the uniformity of the exhaust. One end of the gas guide groove 402 communicates with the second side of the eccentric communication groove 401, and the other end extends to the outer circle of the piston 2 and penetrates the outer circle of the piston 2. The gas guide groove 402 guides the gas from the inner wall surface of the compression chamber 101 to the communication groove 401, ensuring that the gas can smoothly enter the communication groove 401. The arrangement of the gas guide groove 402 reduces the flow loss of the gas when entering the communication groove 401, avoids direct impact of the gas on the edge of the communication groove 401, and reduces vortex and local pressure loss. When the communication groove 401 and the air passage groove 4 are arranged, the eccentric arrangement of the communication groove 401 and the circumferential distribution of the gas guide groove 402 jointly optimize the exhaust path, allowing the gas to be uniformly and smoothly discharged from the inner wall surface of the compression chamber 101. The gas guide groove 402 uniformly guides the gas to the communication groove 401, and the eccentric arrangement of the communication groove 401 further reduces the resistance of the gas entering the suction blade exhaust port 301, reducing flow loss. The synergistic effect of the communication groove 401 and the gas guide groove 402 ensures that the gas can be discharged in time, reduces over-compression, and improves exhaust efficiency.

[0065] For reference Figures 1 to 5 As shown, the air passage groove 4 also includes an arc-shaped groove 405, which is located on the second side of the communication groove 401. The arc-shaped groove 405 is concentrically arranged with the communication groove 401, and the two ends of the arc-shaped groove 405 extend to and penetrate the outer circle of the piston 2. Moreover, the plurality of gas guide grooves 402 intersect with the arc-shaped groove 405. Specifically, the arc-shaped groove 405 intersects with the middle part of the gas guide groove 402. The gas in the gas guide groove 402 and the gas in the arc-shaped groove 405 can converge at the intersection, and then flow into the communication groove 401. Because the communication hole is offset, the compressed gas on the other side is more difficult to discharge, so several gas guide grooves 402 are arranged on the other side to guide more gas into the exhaust port.

[0066] Specifically, when the high-pressure gas flows along the inner wall of the compression chamber 101 towards the end face of the piston 2, it enters the plurality of gas guide grooves 402 arranged along the circumference of the end face of the piston 2. The gas guide grooves 402 are all intersected with the arc-shaped groove 405, one end of each gas guide groove 402 is communicated with the arc-shaped groove 405, and the other end of each gas guide groove 402 extends to the outer circle of the piston 2 and penetrates through the outer circle of the piston 2. The two ends of the arc-shaped groove 405 also extend to the outer circle of the piston 2 and penetrate through the outer circle of the piston 2. The gas adhering to the inner wall of the compression chamber 101 can flow into the arc-shaped groove 405 and the gas guide groove 402 respectively. After entering the gas guide groove 402, the gas flows from the vicinity of the outer circle of the piston 2 to the arc-shaped groove 405 along the gas guide groove 402. The plurality of gas guide grooves 402 are uniformly distributed around the arc-shaped groove 405, which ensures that the gas can be uniformly collected from different positions of the inner wall of the compression chamber 101 and guided to the arc-shaped groove 405. When the gas flows to the communication position of the gas guide groove 402 and the arc-shaped groove 405, it enters the arc-shaped groove 405. The arc-shaped groove 405 is concentrically arranged with the communication groove 401 and located at the second side of the communication groove 401. The two ends of the arc-shaped groove 405 extend to the outer circle of the piston 2 and penetrate through the outer circle of the piston 2. The gas flows along an arc-shaped path in the arc-shaped groove 405 and finally enters the communication groove 401 through the communication position of the gas guide groove 402 and the communication groove 401.

[0067] In this embodiment, the arc-shaped groove 405 provides an intermediate transition path for the gas from the gas guide groove 402 to the communication groove 401, which enables the gas to change the flow direction more smoothly and reduces the flow loss. The arc-shaped groove 405 is concentrically arranged with the communication groove 401, which enables the gas to have a more uniform flow distribution when entering the communication groove 401, avoids the gas directly impacting the edge of the communication groove 401, and reduces the local flow resistance. The plurality of gas guide grooves 402 are uniformly distributed around the arc-shaped groove 405, which uniformly collects the high-pressure gas near the inner wall of the compression chamber 101 and guides it to the arc-shaped groove 405. The gas guide groove 402 efficiently transports the gas to the communication groove 401, which improves the collection and transportation efficiency of the gas. The arrangement of the arc-shaped groove 405 enables the gas to better converge and flow near the eccentric position of the end face of the piston 2, which cooperates with the eccentrically arranged communication groove 401 to further improve the exhaust efficiency. The arc-shaped groove 405 can uniformly distribute the gas from the plurality of gas guide grooves 402 along the length of the entire arc-shaped groove 405 and then uniformly flow into the communication groove 401, which improves the uniformity of the exhaust. This uniform distribution helps to reduce the local high pressure and vortex at the communication groove 401 and the exhaust port 301 of the suction blade, further reduces the exhaust resistance, and through the optimization of the exhaust path and the reduction of the exhaust resistance, the arc-shaped groove 405 helps to timely exhaust the high-pressure gas, reduces the accumulation of high-pressure gas in the cylinder 1, and thus reduces the probability of over-compression phenomenon, improves the efficiency and performance of the compressor.

[0068] As a specific embodiment, at least three gas guide grooves 402 are provided, that is, the gas guide grooves 402 are arranged in the blank area opposite to the exhaust port, the included angle between two adjacent straight grooves is ≤90°, the arc-shaped groove 405 has two intersection points with the outer circular contour line of the piston 2, the included angle between the line connecting each intersection point and the nearest straight groove and the line connecting the arc-shaped groove 405 and the nearest straight groove is ≤90°, the radius of the arc-shaped groove 405 is >1.2*the radius of the outer circle of the piston 2, the arc-shaped groove 405 is segmented by the gas guide grooves 402, each segment can be replaced by a straight groove, at least one gas guide groove 402 is arranged at the position closest to the outer circular contour line of the piston 2 after the exhaust port is offset, and the included angle between two adjacent gas guide grooves 402 is ≤90°.

[0069] For reference Figures 1 to 6 As shown in FIG. 3, as a third embodiment, when two air suction blade exhaust ports 301 are symmetrically arranged on the air suction blade 3, two communication grooves 401 are symmetrically arranged on the end face of the piston 2, and the projection contour line of the air suction blade exhaust port 301 on the end face of the piston 2 is located in the communication groove 401; the gas guide groove 402 includes a first straight groove 421 and a second straight groove 422, the two ends of the first straight groove 421 are respectively connected to the two communication grooves 401, and the center of the end face of the piston 2 is located on the first straight groove 421; the second straight groove 422 is perpendicular to the first straight groove 421, and the two ends of the second straight groove 422 extend to the outer circle of the piston 2 and penetrate through the outer circle of the piston 2. When a plurality of first straight grooves 421 and second straight grooves 422 are arranged, the included angle between the first straight groove 421 and the second straight groove 422 is ≤90°.

[0070] Specifically, the high-pressure gas enters the plurality of second straight grooves 422 arranged on the end face of the piston 2, the second straight grooves 422 are perpendicular to the first straight groove 421, and the two ends of the second straight grooves 422 extend to the outer circle of the piston 2 and penetrate through the outer circle of the piston 2, the gas flows along the second straight grooves 422 from the vicinity of the outer circle of the piston 2 to the first straight groove 421, the second straight grooves 422 are uniformly distributed on the end face of the piston 2, which ensures that the gas is collected from different positions on the inner wall of the compression chamber 101 and guided to the first straight groove 421. When the gas flows to the intersection of the second straight groove 422 and the first straight groove 421, it enters the first straight groove 421, the two ends of the first straight groove 421 are respectively connected to the two communication grooves 401, and the center of the end face of the piston 2 is located on the first straight groove 421, the gas flows along the first straight groove 421 to the two communication grooves 401. The first straight groove 421 as the central communication groove 401 uniformly distributes the gas to the two communication grooves 401 on both sides. After the gas enters the two communication grooves 401, it flows along the communication grooves 401 to the air suction blade exhaust port 301, the communication grooves 401 are symmetrically arranged on the end face of the piston 2, the projection contour line of the air suction blade exhaust port 301 on the end face of the piston 2 is located in the two communication grooves 401, and the gas is discharged through the two air suction blade exhaust ports 301 and the coaxial valve seat exhaust port 6.

[0071] In the embodiment, the first straight groove 421 and the second straight groove 422 intersect with each other to form a cross-shaped gas guide system, the two ends of the first straight groove 421 are communicated with the two communication grooves 401 respectively, and the second straight groove 422 is perpendicular to the first straight groove 421 and extends to the outer circle of the piston 2. Such a layout enables the gas to flow efficiently at the end face of the piston 2, to gather from the vicinity of the outer circle to the first straight groove 421 through the second straight groove 422, and then to be distributed to the two communication grooves 401 from the first straight groove 421, thereby optimizing the exhaust path and making the gas flow more smoothly. Compared with a single gas guide groove 402, the cross-shaped structure shortens the flow distance of the gas from the wall surface of the cylinder 1 to the exhaust port, reduces the energy loss of the gas during the exhaust process, and improves the exhaust efficiency. The two symmetrically arranged gas suction blade exhaust ports 301 cooperate with the two communication grooves 401, so that the gas can be exhausted from two directions at the same time. Compared with a single exhaust port and a communication groove 401, the exhaust efficiency is significantly improved, the amount of gas exhausted per unit time is more, the exhaust time is reduced, and the working efficiency of the compressor is improved. The second straight groove 422 is distributed along the circumference of the end face of the piston 2, can uniformly collect the high-pressure gas near the inner wall surface of the compression chamber 101, and guide it to the first straight groove 421. The first straight groove 421 uniformly distributes the gas to the two communication grooves 401, so that the gas can uniformly enter the two gas suction blade exhaust ports 301, avoids excessive concentration of local exhaust, improves the uniformity of exhaust, and disperses the exhaust pressure of the two communication grooves 401 and the two exhaust ports, thereby avoiding excessive local pressure and reducing the impact and wear on the components of the exhaust system, improving the reliability and service life of the compressor.

[0072] For reference Figures 1 to 6 As shown in the figure, the two communication grooves 401 are eccentrically arranged on the end face of the piston 2, the first side of the communication groove 401 is close to the outer circle of the piston 2, and the second side of the communication groove 401 is away from the outer circle of the piston 2; the air passage 4 further comprises two arc grooves 405, the two arc grooves 405 are symmetrically arranged about the first straight groove 421, the center of the arc groove 405 is concentrically arranged with the center of the end face of the piston 2, the two ends of the arc groove 405 are communicated with the second side of the two communication grooves 401 respectively, and the two arc grooves 405 are intersected with the second straight groove 422.

[0073] Specifically, the high-pressure gas enters the second linear groove 422 formed along the end surface of the piston 2, the two ends of the second linear groove 422 extend to the outer circle of the piston 2 and penetrate the outer circle of the piston 2, ensuring that the gas can be collected from different positions on the inner wall surface of the compression chamber 101, the gas flows along the second linear groove 422 to the direction of the first linear groove 421, the second linear groove 422 intersects the first linear groove 421 perpendicularly, forming a cross-shaped gas guide system. When the gas flows to the intersection of the second linear groove 422 and the first linear groove 421, it enters the first linear groove 421, and the two ends of the first linear groove 421 are respectively communicated with the two communication grooves 401. When the gas flows in the second linear groove 422, part of the gas enters the two arc-shaped grooves 405, the two ends of the arc-shaped grooves 405 are respectively communicated with the second side of the two communication grooves 401, and the two arc-shaped grooves 405 are symmetrically arranged about the first linear groove 421, after the gas enters the arc-shaped grooves 405, it flows along the arc-shaped path, and finally enters the communication groove 401 through the communication between the arc-shaped groove 405 and the communication groove 401. After the gas enters the communication groove 401, it flows along the communication groove 401 to the direction of the gas exhaust port 301 of the suction blade, the communication groove 401 is eccentrically arranged, the first side of which is close to the outer circle of the piston 2, and the second side of which is away from the outer circle of the piston 2.

[0074] In this embodiment, the arc-shaped groove 405 provides a buffer area for the gas, allowing the gas to smoothly change direction, reducing flow loss, and the arc-shaped groove 405 is communicated with the second side of the communication groove 401, providing an optimized path for the gas from the first linear groove 421 to the communication groove 401, allowing the gas to flow more smoothly. The arc-shaped groove 405 can further collect the gas flowing from the second linear groove 422, ensuring that more gas can enter the communication groove 401, improving the collection efficiency of the gas, and the arc-shaped groove 405 increases the number of exhaust passages, allowing the gas to be discharged more quickly, improving the exhaust efficiency. The arc-shaped arrangement of the arc-shaped groove 405 reduces the resistance of the gas when changing direction, allowing the gas to flow more smoothly into the communication groove 401, and the arc-shaped groove 405 can uniformly distribute the gas into the communication groove 401, reducing local flow concentration and reducing exhaust resistance. The arc-shaped groove 405 is communicated with the two communication grooves 401, which can uniformly guide the gas to the two communication grooves 401, improving the uniformity of the exhaust, and the arrangement of the arc-shaped groove 405 reduces the vortex and impact loss of the gas when entering the communication groove 401, making the exhaust process more stable.

[0075] In this embodiment, the arc-shaped groove 405, the first linear groove 421 and the second linear groove 422 are in communication with each other to form an efficient gas guiding system. The second linear groove 422 is responsible for collecting gas near the wall surface of the cylinder 1 and guiding it to the first linear groove 421 and the arc-shaped groove 405. The first linear groove 421 distributes the gas to the two communication grooves 401, and the arc-shaped groove 405 further optimizes the gas flow path, so that the gas enters the communication grooves 401 more uniformly. Compared with a single gas guiding groove 402, this combined structure shortens the flow distance of the gas from the wall surface of the cylinder 1 to the exhaust port, reduces energy loss, and improves exhaust efficiency. The second linear groove 422, the first linear groove 421 and the arc-shaped groove 405 cooperate with each other to uniformly collect and guide the high-pressure gas near the inner wall surface of the compression chamber 101 to the communication grooves 401, so that the gas enters the exhaust port uniformly, improves the uniformity of exhaust, avoids excessive concentration of gas in local areas, makes the exhaust process more uniform and stable, reduces the formation of local vortex, and reduces the exhaust resistance.

[0076] For reference Figures 1 to 6 As shown in FIG. 4, the gas guiding groove 402 further includes two third linear grooves 423. The third linear grooves 423 are arranged corresponding to the communication grooves 401. One end of the third linear groove 423 is in communication with the first side of the communication groove 401, and the other end of the third linear groove extends towards the outer circle of the piston 2 and penetrates the outer circle of the piston 2.

[0077] Specifically, the high-pressure gas enters the two third linear grooves 423 arranged along the end surface of the piston 2. One end of each third linear groove 423 is in communication with the first side of one communication groove 401, and the other end extends towards the outer circle of the piston 2 and penetrates the outer circle of the piston 2. The gas flows along the third linear groove 423 from the vicinity of the outer circle of the piston 2 to the communication groove 401. The arrangement of the third linear groove 423 ensures that the gas can be collected from different positions of the inner wall surface of the compression chamber 101 and guided to the communication groove 401. When the gas flows to the communication position of the third linear groove 423 and the communication groove 401, it enters the communication groove 401. The communication groove 401 is eccentrically arranged, with the first side close to the outer circle of the piston 2 and the second side away from the outer circle of the piston 2. At the second side of the communication groove 401, the gas enters the two arc-shaped grooves 405. The two ends of the arc-shaped groove 405 are respectively in communication with the second sides of the two communication grooves 401, and the two arc-shaped grooves 405 are symmetrically arranged about the first linear groove 421. The gas flows along the arc-shaped path in the arc-shaped groove 405, and finally enters the first linear groove 421 through the communication position of the arc-shaped groove 405 and the second linear groove 422. The gas flows along the first linear groove 421 to the two communication grooves 401. The two ends of the first linear groove 421 are respectively in communication with the two communication grooves 401.

[0078] In the embodiment, the third straight groove 423 provides an additional exhaust passage for the high-pressure gas, so that the gas can be collected from different positions of the inner wall surface of the compression chamber 101 and guided to the communication groove 401, increasing the exhaust path and improving the exhaust efficiency. The arrangement of the third straight groove 423 optimizes the gas flow path, so that the gas can flow more directly from the vicinity of the outer circle of the piston 2 to the communication groove 401, shortening the flow distance of the gas and reducing the energy loss during the flow process. The third straight groove 423 cooperates with the second straight groove 422 and the arc-shaped groove 405, and the third straight groove 423 helps to more evenly collect the high-pressure gas near the inner wall surface of the compression chamber 101, ensuring that the gas can uniformly enter the communication groove 401 and avoiding local gas accumulation, thereby improving the uniformity of the exhaust.

[0079] For reference Figures 1 to 7 As shown in FIG. 4, as a fourth embodiment, when three gas suction blade exhaust ports 301 are arranged on the gas suction blade 3, three communication grooves 401 are arranged on the end surface of the piston 2, and the projection contour lines of the gas suction blade exhaust ports 301 on the end surface of the piston 2 are located in the communication grooves 401, respectively. The vent groove 4 further comprises a ring groove 404 arranged on the end surface of the piston 2. Taking the end surface of the piston 2 as the projection plane, the ring groove 404 is arranged concentrically with the center of the end surface of the piston 2, and the three communication grooves 401 are arranged on the arc segment of the ring groove 404 at intervals, and the ring groove 404 intersects with the gas guide groove 402.

[0080] Specifically, the gas flows along the gas guide groove 402 from the vicinity of the outer circle of the piston 2 to the direction of the ring groove 404. The gas guide grooves 402 are uniformly distributed on the end surface of the piston 2, ensuring that the gas can be uniformly collected from different positions of the inner wall surface of the compression chamber 101 and guided to the ring groove 404. When the gas flows to the communication position of the gas guide groove 402 and the ring groove 404, it enters the ring groove 404. The ring groove 404 is arranged concentrically with the center of the end surface of the piston 2, providing an intermediate buffer area for the gas. The gas flows along the annular path in the ring groove 404, and the ring groove 404 uniformly distributes the gas to the three communication grooves 401. The three communication grooves 401 are arranged on the arc segment of the ring groove 404 at intervals, and the gas enters the three communication grooves 401 from the ring groove 404. The arrangement of the communication grooves 401 enables the gas to be uniformly distributed to each exhaust port.

[0081] In the embodiment, the ring groove 404 serves as an intermediate buffer area for the gas flow, enabling the gas to be more uniformly distributed and flow into the three communication grooves 401. The ring groove 404 uniformly distributes the gas to the three communication grooves 401, enabling the gas to be discharged simultaneously from the three exhaust ports, thereby improving the exhaust efficiency. Uniformly distributing the gas to the three communication grooves 401 avoids excessive concentration of local flow, making the exhaust process more uniform and stable. Uniformly distributing the gas to the three communication grooves 401 reduces the pressure on individual communication grooves 401 and exhaust ports, improving the stability of the compressor operation.

[0082] In the embodiment, the three communication grooves 401 are evenly spaced on the arc segment of the ring groove 404, which can ensure that the gas flowing in the ring groove 404 is evenly distributed to each communication groove 401. This uniform distribution avoids the gas being too concentrated in a local area, reduces the flow resistance and the formation of vortex, and the evenly spaced communication grooves 401 make the flow path of the gas entering the communication grooves 401 shorter, reducing flow loss and improving exhaust efficiency. The three communication grooves 401 correspond to the three air suction piece exhaust ports 301, and the uniform spacing ensures that the gas can be exhausted from three directions at the same time. This multi-point exhaust arrangement significantly improves the exhaust efficiency, reduces the exhaust time, and improves the working efficiency of the compressor. The ring groove 404 serves as an intermediate buffer area, which can uniformly collect gas from different directions and efficiently distribute it to the three communication grooves 401, ensuring that more gas can be smoothly exhausted.

[0083] For reference Figures 1 to 7 As shown, the gas guide groove 402 includes a first straight groove 421 and a second straight groove 422. One end of the first straight groove 421 communicates with the communication groove 401 at the middle position, and the other end of the first straight groove 421 extends to the outer circle of the piston 2 and penetrates the outer circle of the piston 2. The center of the end surface of the piston 2 is located on the first straight groove 421, and the ring groove 404 intersects the first straight groove 421. One end of the second straight groove 422 communicates with the side of the communication groove 401 away from the first straight groove 421, and the other end of the second straight groove 422 extends to the outer circle of the piston 2 and penetrates the outer circle of the piston 2, and the second straight groove 422 is located on the extension line of the first straight groove 421.

[0084] Specifically, the high-pressure gas enters the first linear groove 421 along the end surface of the piston 2, one end of the first linear groove 421 communicates with the intermediate position communication groove 401, and the other end extends to the outer circle of the piston 2 and penetrates the outer circle of the piston 2, the body flows along the first linear groove 421 from the vicinity of the outer circle of the piston 2 to the intermediate position communication groove 401, the arrangement of the first linear groove 421 ensures that the gas can be collected from different positions on the inner wall of the compression chamber 101 and guided to the intermediate position communication groove 401. When the gas flows to the communication between the first linear groove 421 and the intermediate communication groove 401, it enters the intermediate communication groove 401. After the gas enters the intermediate communication groove 401, it flows along the communication groove 401 to the suction blade exhaust port 301. One end of the second linear groove 422 communicates with the side of the intermediate communication groove 401 away from the first linear groove 421, the other end extends to the outer circle of the piston 2 and penetrates the outer circle of the piston 2, and is located on the extension line of the first linear groove 421. The high-pressure gas on the inner wall of the compression chamber 101 can also flow from the second linear groove 422 to the intermediate position communication groove 401. The gas in the first linear groove 421 flows to the intersection with the ring groove 404, and the gas flows along the annular path in the ring groove 404. The ring groove 404 uniformly distributes the gas to the other two communication grooves 401. The three communication grooves 401 are spaced on the arc segment of the ring groove 404. The gas enters the other two communication grooves 401 from the ring groove 404. Each communication groove 401 corresponds to a suction blade exhaust port 301, which ensures that the gas can be uniformly distributed to each exhaust port.

[0085] In this embodiment, the annular groove 404 is in communication with the first and second straight grooves 422, forming a complex and efficient gas guiding system. The first straight groove 421 is responsible for guiding the gas from the wall of the cylinder 1 to the intermediate communication groove 401, and the second straight groove 422 further guides the gas flow. The annular groove 404 acts as an intermediate buffer zone, uniformly distributing the gas to other communication grooves 401, optimizing the gas flow path. This combined structure shortens the flow distance of the gas from the wall of the cylinder 1 to the exhaust port, reduces energy loss, and improves exhaust efficiency. Corresponding to the three communication grooves 401 of the three exhaust ports 301 of the suction blades, the gas can be discharged from multiple directions, improving exhaust efficiency, reducing exhaust time, and improving compressor working efficiency. The second straight groove 422 and the annular groove 404 work together to uniformly collect high-pressure gas near the inner wall of the compression chamber 101 and guide it to each communication groove 401, allowing the gas to enter the exhaust port uniformly and improving exhaust uniformity. The annular groove 404 uniformly distributes the gas to the three communication grooves 401, avoiding excessive local flow concentration, making the exhaust process more uniform and stable, providing a more uniform exhaust path and lower exhaust resistance, optimizing the exhaust performance of the compressor, and ensuring high exhaust efficiency and stable operation under various working conditions. The annular groove 404, the first straight groove 421, and the second straight groove 422 cooperate to optimize the exhaust path, improve exhaust efficiency and uniformity, reduce exhaust resistance, and enhance the performance and reliability of the compressor.

[0086] For reference Figures 1 to 7 As shown, the vent groove 4 also includes two arc-shaped grooves 405, which are symmetrically arranged about the first straight groove 421. The two ends of the arc-shaped groove 405 extend to the outer circle of the piston 2 and penetrate the outer circle of the piston 2, and the two arc-shaped grooves 405 intersect with the communication grooves 401 on both sides, respectively.

[0087] Specifically, the gas on the inner wall of the compression chamber 101 is guided by the first straight groove 421 to the annular groove 404, which uniformly distributes the gas to the other two communication grooves 401. At the same time, the gas on the inner wall of the compression chamber 101 is guided by the two arc-shaped grooves 405 to the communication grooves 401 on both sides. Since the two arc-shaped grooves 405 also have intersection points with the annular groove 404, the arc-shaped groove 405 and the annular groove 404 are in communication, and the gas can flow uniformly in the two grooves.

[0088] In this embodiment, the arc-shaped groove 405 provides an additional path for the gas to flow directly from the inner wall of the compression chamber 101 to the two side communication grooves 401, so that the gas can not only be distributed to the communication grooves 401 through the ring groove 404, but also directly enter the two side communication grooves 401 through the arc-shaped groove 405, enriching the gas flow path and improving the flexibility and efficiency of exhaust. The arc-shaped groove 405 intersects with the ring groove 404 to form a mutually connected flow guide network, and the gas can flow uniformly in the arc-shaped groove 405 and the ring groove 404, realizing more flexible path selection, optimizing the exhaust path, and making the gas flow more smooth. The arc-shaped groove 405 uniformly distributes the gas to the two side communication grooves 401, avoiding excessive concentration of gas in a certain communication groove 401, balancing the gas flow of each communication groove 401, and making the exhaust more uniform and stable. By guiding the gas to the two side communication grooves 401, the arc-shaped groove 405 helps to disperse the gas flow, reduces the formation of local high pressure, reduces the exhaust resistance, and improves the exhaust efficiency. The arc-shaped groove 405 provides more flow paths for the gas, allowing it to be discharged from the cylinder 1 more quickly, shortening the exhaust time and improving the exhaust efficiency. The synergistic effect of the arc-shaped groove 405 with the ring groove 404 and the communication groove 401 enhances the flow of the gas, allowing it to be discharged more quickly and improving the working efficiency of the compressor. In addition, the arc-shaped groove 405 can uniformly distribute the gas to the two side communication grooves 401, avoiding excessive concentration of local flow, improving the uniformity of exhaust, and reducing the accumulation of gas in the cylinder 1.

[0089] For reference Figures 1 to 8 As shown in FIG. 5, as a fifth embodiment, when the suction blade 3 is provided with a special-shaped suction blade exhaust port 301, a communication groove 401 matching the suction blade exhaust port 301 is opened on the end face of the piston 2, and the projection contour line of the special-shaped suction blade exhaust port 301 on the end face of the piston 2 is located in the communication groove 401; the air passage groove 4 further comprises an arc-shaped groove 405, which is opened on the end face of the piston 2, and the end face of the piston 2 is taken as the projection plane. The arc-shaped groove 405 is concentrically arranged with the center of the end face of the piston 2, the two ends of the arc-shaped groove 405 are respectively communicated with the communication groove 401, and the arc-shaped groove 405 intersects with the gas guide groove 402.

[0090] Specifically, the high-pressure gas enters the gas guide groove 402 formed along the end face of the piston 2. The gas guide groove 402 guides the gas from the inner wall surface of the compression chamber 101 to the arc-shaped groove 405. The gas flows along the gas guide groove 402 from the vicinity of the outer circle of the piston 2 to the arc-shaped groove 405. The arrangement of the gas guide groove 402 ensures that the gas can be uniformly collected from different positions on the inner wall surface of the compression chamber 101 and guided to the arc-shaped groove 405. When the gas flows to the intersection of the gas guide groove 402 and the arc-shaped groove 405, it enters the arc-shaped groove 405. The arc-shaped groove 405 is concentrically arranged with the center of the end face of the piston 2, providing a middle buffer area for the gas. The gas flows along an arc-shaped path in the arc-shaped groove 405. The two ends of the arc-shaped groove 405 are respectively connected to the communication grooves 401, ensuring that the gas can be uniformly distributed to the communication grooves 401. The gas enters the communication grooves 401 from the arc-shaped groove 405. The arrangement of the communication grooves 401 matches the profiled gas suction blade exhaust port 301, ensuring that the gas can be uniformly distributed to the exhaust port. The gas is discharged through the profiled gas suction blade exhaust port 301 and the coaxial valve seat exhaust port 6.

[0091] In this embodiment, the arc-shaped groove 405 provides a buffer area for the gas, allowing the gas to smoothly change the flow direction and reducing flow loss. Before entering the communication grooves 401, the gas adjusts the flow direction in the arc-shaped groove 405, avoiding sharp changes in direction and reducing flow resistance. The arc-shaped groove 405 is concentrically arranged with the communication grooves 401, providing an optimized path for the gas from the gas guide groove 402 to the communication grooves 401, allowing the gas to flow more smoothly. The arrangement of the arc-shaped groove 405 plays an important role in optimizing the exhaust path, improving exhaust efficiency, reducing exhaust resistance, enhancing structural reliability, improving exhaust uniformity, and adapting to profiled exhaust ports. Through the synergistic effect of the arc-shaped groove 405, the gas guide groove 402, and the communication grooves 401, the exhaust process of the compressor is more efficient and stable, the exhaust uniformity is improved, and the overall performance is significantly improved.

[0092] For reference Figures 1 to 8 As shown in the figure, the profiled gas suction blade exhaust port 301 is eccentrically arranged on the end face of the piston 2. The gas guide groove 402 includes a first straight groove 421 and a plurality of second straight grooves 422. One end of the first straight groove 421 is connected to the gas suction blade exhaust port 301, and the other end of the first straight groove 421 intersects with the arc-shaped groove 405. The center of the end face of the piston 2 is located on the first straight groove 421. The plurality of second straight grooves 422 are arranged in a circumferential direction along the arc-shaped groove 405. One end of the second straight groove 422 intersects with the arc-shaped groove 405, and the other end of the second straight groove 422 extends to the outer circle of the piston 2 and penetrates through the outer circle of the piston 2.

[0093] Specifically, the high-pressure gas enters the plurality of second linear grooves 422 formed along the end surface of the piston 2. One end of each of the second linear grooves 422 intersects the arc-shaped groove 405, and the other end extends to the outer circle of the piston 2 and penetrates the outer circle of the piston 2. The gas flows along the second linear grooves 422 from the vicinity of the outer circle of the piston 2 to the arc-shaped groove 405. The plurality of second linear grooves 422 are uniformly distributed in the circumferential direction of the arc-shaped groove 405, ensuring that the gas can be uniformly collected from different positions on the inner wall surface of the compression chamber 101 and guided to the arc-shaped groove 405. When the gas flows to the intersection of the second linear groove 422 and the arc-shaped groove 405, it enters the arc-shaped groove 405. The arc-shaped groove 405 is concentrically arranged with the center of the end surface of the piston 2, providing a middle buffer area for the gas. When the gas flows to the intersection of the arc-shaped groove 405 and the first linear groove 421, it enters the first linear groove 421. One end of the first linear groove 421 communicates with the exhaust port 301 of the shaped suction blade, and the other end intersects the arc-shaped groove 405. The center of the end surface of the piston 2 is located on the first linear groove 421. The gas flows along the first linear groove 421 to the exhaust port 301 of the suction blade. The arrangement of the linear groove ensures that the gas can flow smoothly from the arc-shaped groove 405 to the exhaust port 301 of the suction blade.

[0094] In the present embodiment, the first linear groove 421 and the plurality of second linear grooves 422 communicate with the arc-shaped groove 405, forming a multi-path gas guiding system. The gas can enter the arc-shaped groove 405 from the wall surface of the cylinder 1 through the second linear grooves 422, then flow into the first linear groove 421 through the arc-shaped groove 405, and finally be discharged. This multi-path arrangement makes the gas flow more flexible, reduces the flow resistance of the gas during the exhaust process, and optimizes the exhaust path. The plurality of second linear grooves 422 are arranged at intervals in the circumferential direction of the arc-shaped groove 405, which can uniformly collect the high-pressure gas near the inner wall surface of the compression chamber 101 and guide it to the arc-shaped groove 405. The arc-shaped groove 405 uniformly distributes the gas to the first linear groove 421, enabling the gas to enter the exhaust port uniformly and improving the exhaust efficiency. The first linear groove 421 directly communicates with the exhaust port 301 of the suction blade, enabling the gas to be quickly discharged, reducing the exhaust time, and improving the working efficiency of the compressor. Moreover, the first linear groove 421 and the arc-shaped groove 405 both communicate with the communication groove 401, and both can guide the gas to the communication groove 401, improving the exhaust efficiency.

[0095] As a specific embodiment, a plurality of second linear grooves 422 are provided, and the included angle between adjacent second linear grooves 422 is ≤180°. In the above five embodiments, a chamfer groove 403 is provided on the end surface of the piston 2.

[0096] For reference Figures 1 to 10As shown, the piston 2 includes a piston body 201 and a mounting plate 202 mounted at the top end of the piston 2, the mounting plate 202 is provided with a vent groove 4 away from the end face of the piston 2, one end of the vent groove 4 extends to the outer circle of the mounting plate 202, and the other end of the vent groove 4 communicates with the suction blade exhaust port 301.

[0097] In this embodiment, the vent groove 4 on the mounting plate 202 extends to the outer circle of the mounting plate 202 at one end and communicates with the suction blade exhaust port 301 at the other end, which provides an efficient exhaust path for high-pressure gas from the outer circle of the mounting plate 202 to the suction blade exhaust port 301, allowing the gas to be discharged more quickly. The mounting plate 202, as an additional component of the piston body 201, can protect the piston body 201 from direct impact of high-pressure gas and enhance the structural stability of the piston 2. The mounting plate 202 can be machined separately, which is convenient for manufacturing and maintenance. If the vent groove 4 needs to be repaired or replaced, only the mounting plate 202 needs to be replaced, without the need to process the entire piston 2, reducing maintenance costs. This arrangement allows for flexible adjustment of the shape and size of the vent groove 4 to adapt to different compressor settings and performance requirements.

[0098] A compressor comprising a pump body assembly, the pump body assembly being as described above.

[0099] It is easily understood by those skilled in the art that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0100] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only a preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, which should be considered as the protection scope of the present application.

Claims

1. A pump body assembly, characterized by, The utility model relates to a cylinder (1), piston (2) and suction blade (3) are included. The cylinder (1) is provided with a compression chamber (101), and the piston (2) reciprocates in the compression chamber (101); the suction blade (3) is installed on the cylinder (1), and the suction blade (3) covers the compression chamber (101); The suction blade (3) is provided with a suction blade exhaust port (301), the end surface of the piston (2) is provided with a ventilation groove (4), the projection contour line of the suction blade exhaust port (301) on the end surface of the piston (2) is located in the ventilation groove (4), one end of the ventilation groove (4) extends to the outer circle of the piston (2), and the other end of the ventilation groove (4) is communicated with the suction blade exhaust port (301), so that the gas near the inner wall of the compression chamber (101) flows to the suction blade exhaust port (301) through the ventilation groove (4). The ventilation groove (4) comprises a communication groove (401) and a gas guide groove (402), the communication groove (401) and the gas guide groove (402) are both arranged on the end surface of the piston (2), the projection contour line of the suction blade exhaust port (301) on the end surface of the piston (2) is located in the communication groove (401), and in the axial direction of the piston (2), the communication groove (401) is communicated with the suction blade exhaust port (301); one end of the gas guide groove (402) is communicated with the communication groove (401), and the other end of the gas guide groove (402) extends to the outer circle of the piston (2) and penetrates the outer circle of the piston (2).

2. The pump body assembly of claim 1, wherein, The ventilation groove (4) further comprises a chamfer groove (403), the chamfer groove (403) is arranged around the outer circle of the piston (2), and one end of the gas guide groove (402) away from the communication groove (401) is communicated with the chamfer groove (403).

3. The pump body assembly of claim 2, wherein, When the communication groove (401) is concentrically arranged with the center of the end surface of the piston (2), a plurality of gas guide grooves (402) are arranged along the circumferential direction of the end surface of the piston (2), one end of the plurality of gas guide grooves (402) is communicated with the communication groove (401), and the other end of the plurality of gas guide grooves (402) respectively extends to the outer circle of the piston (2) and penetrates the outer circle of the piston (2).

4. The pump body assembly of claim 2, wherein, The ventilation groove (4) further comprises a ring groove (404), the ring groove (404) is arranged on the end surface of the piston (2), the end surface of the piston (2) is taken as a projection plane, the ring groove (404) is concentrically arranged with the communication groove (401), the ring groove (404) is located on the radial outer side of the communication groove (401), and the plurality of gas guide grooves (402) respectively intersect with the ring groove (404).

5. The pump body assembly of claim 4, wherein, ​ 6. The pump body assembly of claim 2, wherein, When the communication groove (401) is eccentrically arranged on the end face of the piston (2), the first side of the communication groove (401) is close to the outer circle of the piston (2), and the second side of the communication groove (401) is away from the outer circle of the piston (2); a plurality of gas guide grooves (402) are arranged on the end face of the piston (2) in the circumferential direction, the plurality of gas guide grooves (402) are located on the second side of the communication groove (401), one end of the plurality of gas guide grooves (402) is communicated with the communication groove (401), and the other end of the plurality of gas guide grooves (402) respectively extends to the outer circle of the piston (2) and penetrates the outer circle of the piston (2).

7. The pump body assembly of claim 6, wherein, The ventilation groove (4) further comprises an arc-shaped groove (405), the arc-shaped groove (405) is located on the second side of the communication groove (401), the arc-shaped groove (405) is arranged concentrically with the communication groove (401), and the two ends of the arc-shaped groove (405) respectively extend to the outer circle of the piston (2) and penetrate the outer circle of the piston (2); and the plurality of gas guide grooves (402) intersect with the arc-shaped groove (405).

8. The pump body assembly of claim 2, wherein, When two air suction blades exhaust ports (301) are symmetrically arranged on the air suction blade (3), two communication grooves (401) are symmetrically arranged on the end face of the piston (2), and the projection contour lines of the air suction blade exhaust ports (301) on the end face of the piston (2) are located in the communication grooves (401) respectively. The gas guide groove (402) comprises a first straight groove (421) and a second straight groove (422), the two ends of the first straight groove (421) are communicated with the two communication grooves (401) respectively, and the center of the end face of the piston (2) is located on the first straight groove (421); the second straight groove (422) intersects perpendicularly with the first straight groove (421), and the two ends of the second straight groove (422) extend to the outer circle of the piston (2) and penetrate the outer circle of the piston (2) respectively.

9. The pump body assembly of claim 8, wherein, The two communication grooves (401) are eccentrically arranged on the end face of the piston (2), the first side of the communication groove (401) is close to the outer circle of the piston (2), and the second side of the communication groove (401) is away from the outer circle of the piston (2); the ventilation groove (4) further comprises two arc-shaped grooves (405), the two arc-shaped grooves (405) are symmetrically arranged about the first straight groove (421), the two ends of the arc-shaped groove (405) are communicated with the second sides of the two communication grooves (401) respectively, and the two arc-shaped grooves (405) intersect with the second straight groove (422).

10. The pump body assembly of claim 9, wherein, The gas guide groove (402) further comprises two third straight grooves (423), the third straight grooves (423) are arranged correspondingly with the communication grooves (401), one end of the third straight groove (423) is communicated with the first side of the communication groove (401), and the other end of the third straight groove (423) extends to the outer circle of the piston (2) and penetrates the outer circle of the piston (2) respectively.

11. The pump body assembly of claim 2, wherein, When the three air suction piece exhaust ports (301) are arranged on the air suction piece (3), three communication grooves (401) are arranged on the end face of the piston (2), and the projection contour lines of the air suction piece exhaust ports (301) on the end face of the piston (2) are located in the communication grooves (401) respectively; The ventilation groove (4) further comprises a ring groove (404) arranged on the end face of the piston (2), and the ring groove (404) is arranged concentrically with the center of the end face of the piston (2) with the end face of the piston (2) as a projection plane, three communication grooves (401) are arranged on the arc segment of the ring groove (404), and the ring groove (404) intersects with the air guide groove (402).

12. The pump body assembly of claim 11, wherein, The air guide groove (402) comprises a first straight groove (421) and a second straight groove (422), one end of the first straight groove (421) communicates with the communication groove (401) at the middle position, the other end of the first straight groove (421) extends to the outer circle of the piston (2) and penetrates the outer circle of the piston (2), the center of the end face of the piston (2) is located on the first straight groove (421), and the ring groove (404) intersects with the first straight groove (421); one end of the second straight groove (422) communicates with the side of the communication groove (401) away from the first straight groove (421), the other end of the second straight groove (422) extends to the outer circle of the piston (2) and penetrates the outer circle of the piston (2), and the second straight groove (422) is located on the extension line of the first straight groove (421).

13. The pump body assembly of claim 12, wherein, The ventilation groove (4) further comprises two arc grooves (405), and the two arc grooves (405) are arranged symmetrically about the first straight groove (421), the two ends of the arc groove (405) extend to the outer circle of the piston (2) and penetrate the outer circle of the piston (2) respectively, the two arc grooves (405) intersect with the communication grooves (401) on both sides respectively, and the two arc grooves (405) both intersect with the ring groove (404).

14. The pump body assembly of claim 2, wherein, When the air suction piece exhaust port (301) is arranged on the air suction piece (3), the communication groove (401) matched with the air suction piece exhaust port (301) is arranged on the end face of the piston (2), and the projection contour line of the air suction piece exhaust port (301) on the end face of the piston (2) is located in the communication groove (401); The ventilation groove (4) further comprises an arc groove (405) arranged on the end face of the piston (2), and the arc groove (405) is arranged concentrically with the center of the end face of the piston (2) with the end face of the piston (2) as a projection plane, the two ends of the arc groove (405) communicate with the communication grooves (401) respectively, and the arc groove (405) intersects with the air guide groove (402).

15. The pump body assembly of claim 14, wherein, The eccentric suction blade exhaust port (301) is arranged on the end face of the piston (2), the gas guide groove (402) comprises a first straight groove (421) and a plurality of second straight grooves (422), one end of the first straight groove (421) is communicated with the communication groove (401), the other end of the first straight groove (421) intersects with the arc-shaped groove (405), and the center of the end face of the piston (2) is located on the first straight groove (421); a plurality of second straight grooves (422) are arranged along the circumference of the arc-shaped groove (405), one end of the second straight groove (422) intersects with the arc-shaped groove (405), and the other end of the second straight groove (422) extends to the outer circle of the piston (2) and penetrates the outer circle of the piston (2).

16. The pump body assembly of any one of claims 1 to 15, wherein, The piston (2) comprises a piston body (201) and a mounting piece (202), the mounting piece (202) is mounted at the top end of the piston body (201), the mounting piece (202) is provided with a ventilation groove (4) away from the end face of the piston (2), one end of the ventilation groove (4) extends to the outer circle of the mounting piece (202), and the other end of the ventilation groove (4) is communicated with the suction blade exhaust port (301).

17. A compressor comprising a pump body assembly, characterized by, The pump body assembly is the pump body assembly in any one of claims 1 to 16.

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