Piston assembly of air compressor

Abstract

The piston assembly of the air compressor comprises a connecting rod part and a piston part which are integrally cast, a piston ring is installed on the piston part, a gland capable of tightly pressing the piston ring on the surface of the piston part is arranged above the piston ring, and the piston part is provided with an exhaust port. A valve block capable of acting above the exhaust port is installed on the surface of the gland through a first screw, a positioning groove is formed in the surface of the piston part, a buffer pad is installed in the positioning groove and comprises an installation part and a buffer part extending to the position above the exhaust port, and a receding groove capable of clamping the buffer part is formed in the gland. The projection, facing one side of the buffering part, of the movable end of the valve block is located in the buffering part, the valve block hits the surface of the buffering part during exhausting, and a first screw sequentially penetrates through the valve block, the gland, the mounting part and the piston part from top to bottom. The operation noise of the piston assembly can be effectively reduced, and meanwhile the positioning installation efficiency between the gland and the piston part is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of piston components, in particular to a piston component of an air compressor. Background Art

[0002] In air compressors, a one-way exhaust valve is installed on some piston heads. When the piston moves up and down, the one-way valve opens intermittently to achieve one-way discharge of gas. A common piston assembly of this type, such as patent "CN202210169271.4", includes an integrally connected connecting rod and piston, and a gland is used to press the piston ring around the piston. The gas pushes up the valve from the air inlet at the bottom of the piston. This piston assembly usually has the following defects:

[0003] On the one hand, the exhaust valve plate of the piston assembly continuously hits the surface of the gland during operation. Since both the valve plate and the gland adopt an inductive structure, a strong mechanical impact is generated, which causes the piston assembly to produce knocking noise during operation. In addition, the gas at the exhaust port of this structure will enter the gap between the gland and the piston, affecting the exhaust effect. Although some piston assemblies are provided with elastic gaskets on the action surface of the valve plate, the long-term hitting of the valve plate is likely to cause the elastic gasket to warp.

[0004] On the other hand, during the installation of the gland, not only is it necessary to align the exhaust port on the gland with the exhaust portion of the piston part up and down, but the screw mounting holes on both sides must also be accurately positioned. However, in actual operation, it is difficult to achieve rapid positioning and installation of the gland and the piston part, resulting in low installation efficiency. Utility Model Content

[0005] To this end, the utility model provides a piston assembly of an air compressor to solve the above-mentioned defects in the prior art.

[0006] A piston assembly of an air compressor comprises an integrally cast connecting rod portion and a piston portion, wherein a piston ring is mounted on the piston portion, a pressure cover is arranged above the piston ring and can press the piston ring tightly against the surface of the piston portion, the piston portion is provided with an exhaust port, a valve plate that can act on the exhaust port is mounted on the surface of the pressure cover by means of a screw, a positioning groove is arranged on the surface of the piston portion, a buffer pad is mounted in the positioning groove, the buffer pad comprises a mounting portion and a buffer portion extending above the exhaust port, a yield groove that can clamp the buffer portion is provided on the pressure cover, a vent that is directly opposite to the exhaust port is provided on the buffer portion, a projection of the movable end of the valve plate toward one side of the buffer portion is located inside the buffer portion, the valve plate hits the surface of the buffer portion when exhausting air, and the screw passes through the valve plate, the pressure cover, the mounting portion and the piston portion in sequence from top to bottom.

[0007] Preferably, the outer edge of the buffer portion is constructed as a stepped platform, and the groove wall of the give way groove is constructed as a stepped groove wall that can cooperate with the stepped platform, and the stepped groove wall can limit the stepped platform.

[0008] Preferably, the piston part includes a support platform and a guide platform coaxially arranged above the support platform, the bottom of the pressure cover is provided with a limiting groove that can cooperate with the guide platform, the side wall of the guide platform is constructed as a guide surface that converges inward from bottom to top, and the internal diameter of the piston ring is equivalent to the bottom diameter of the guide platform.

[0009] Preferably, the piston ring includes a fixing portion and a sealing portion, the fixing portion cooperates with the annular planar structure of the support platform and is fixed by pressing with a pressure cover, the sealing portion extends upward to wrap the edge of the pressure cover, and a gap is formed between the sealing portion and the outer wall of the pressure cover.

[0010] Preferably, the thickness of the mounting portion is equivalent to the depth of the positioning groove, and the buffer portion and the surface of the gland are located at the same level after installation.

[0011] Preferably, a gasket is installed above the valve plate, the gasket is provided with a through hole 1, the pressure cover is provided with a through hole 5, the valve plate is provided with a through hole 2, the mounting portion is provided with a through hole 3, and a threaded hole 1 is provided at the bottom of the positioning groove, and the screw 1 passes through the through hole 1, the through hole 2, the through hole 5 and the through hole 3 in sequence and is locked in the threaded hole 1.

[0012] Preferably, threaded holes 2 are symmetrically arranged on both sides of the surface of the piston part, and through holes 4 are opened on the pressure cover at positions corresponding to the threaded holes 2. Two screws 2 are sequentially penetrated through the through holes 4 on the corresponding sides and locked in the threaded holes 2.

[0013] Preferably, the buffer pad can be made of rubber material.

[0014] The utility model has the following advantages:

[0015] The utility model arranges a buffer pad between the piston part and the pressure cover, and the buffer pad comprises a mounting part and a buffer part, wherein the locking effect of the pressure cover on the mounting part and the limiting effect of the pressure cover's yielding groove on the buffer part can realize the tight installation of the buffer pad, and can prevent the buffer pad from being easily warped when being hit; wherein the buffer part can realize fast and accurate positioning between the pressure cover and the piston part, thereby improving the installation efficiency of the piston assembly as a whole, and during the process of the valve plate falling back, the movable end of the valve plate acts on the surface of the buffer part, thereby reducing the operating noise of the piston assembly; in addition, the buffer pad can also improve the air tightness of the pressure cover and the piston part at the exhaust port, thereby improving the one-way exhaust effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the explosion structure of the utility model;

[0019] Figure 4 For this utility model Figure 2 Schematic diagram of the enlarged structure of part A in the middle.

[0020] In the figure:

[0021] 1-connecting rod; 2-piston; 3-screw 2; 4-piston ring; 401-fixing part; 402-sealing part; 5-pressure cover; 6-valve plate; 601-perforation 2; 7-gasket; 701-perforation 1; 8-exhaust port; 9-buffer pad; 10-screw 1;

[0022] 201- positioning groove; 202- support platform; 203- guide platform; 204- guide surface; 205- threaded hole 1; 206- threaded hole 2;

[0023] 501-giving groove; 5011-step groove wall; 502-limiting groove; 503-through hole four; 504-through hole five;

[0024] 901- buffer part; 902- mounting part; 903- vent; 904- step platform; 905- perforation three. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0026] like Figures 1 to 4 As shown, the utility model provides a piston assembly of an air compressor, comprising an integrally cast connecting rod portion 1 and a piston portion 2, a piston ring 4 is mounted on the piston portion 2, and a gland 5 is arranged above the piston ring 4 to press the piston ring 4 against the surface of the piston portion 2. Specifically:

[0027] The surface of the piston part 2 is symmetrically provided with threaded holes 206 on both sides, and the pressure cover 5 is provided with through holes 503 at positions corresponding to the threaded holes 206. Two screws 23 are sequentially passed through the through holes 503 on the corresponding sides and locked in the threaded holes 206.

[0028] The piston part 2 includes a support platform 202 and a guide platform 203 coaxially arranged above the support platform 202. The bottom of the gland 5 is provided with a limit groove 502 that can cooperate with the guide platform 203. The side wall of the guide platform 203 is configured as a guide surface 404 that gathers inward from bottom to top. The inner diameter of the piston ring 4 is equivalent to the bottom diameter of the guide platform 203. The benefit of setting the guide platform 203 is that it can facilitate the positioning and installation of the gland 5 relative to the piston part 2, and it can also facilitate the positioning and installation of the piston ring 4 relative to the piston part 2 to ensure coaxiality.

[0029] Among them, the piston ring 4 includes a fixing part 401 and a sealing part 402. The fixing part 401 cooperates with the annular planar structure of the support platform 202 and is clamped and fixed by the pressure cover 5. The sealing part 402 extends upward to wrap the edge of the pressure cover 5, and a gap is formed between the sealing part 402 and the outer wall of the pressure cover 5.

[0030] The piston part 2 is provided with an exhaust port 8, and a valve plate 6 capable of acting above the exhaust port 8 is installed on the surface of the gland 5 by means of screws 10.

[0031] In the embodiment of the utility model, a positioning groove 201 is provided on the surface of the piston part 2, and a buffer pad 9 is installed in the positioning groove 201. The buffer pad 9 can be made of rubber material. Specifically:

[0032] The buffer pad 9 includes a mounting portion 902 and a buffer portion 901 extending above the exhaust port 8, and the pressure cover 5 is provided with a clearance groove 501 capable of clamping the buffer portion 901. Further:

[0033] The outer edge of the buffer part 901 is configured as a stepped platform 904, and the groove wall of the clearance groove 501 is configured as a stepped groove wall 5011 that can cooperate with the stepped platform 904, and the stepped groove wall 5011 can limit the position of the stepped platform 904. Thus, the clearance groove 501 of the gland 5 can press the outer edge of the buffer part 901 tightly, avoiding the buffer part 901 from warping and deformation during the process of being hit by the valve plate 6, which affects the exhaust efficiency.

[0034] The buffer part 901 is provided with a vent 903 directly facing the exhaust port 8, the projection of the movable end of the valve plate 6 toward the side of the buffer part 901 is located inside the buffer part 901, the valve plate 6 hits the surface of the buffer part 901 when exhausting, and the screw 10 passes through the valve plate 6, the gland 5, the mounting part 902 and the piston part 2 from top to bottom. Specifically:

[0035] The thickness of the mounting portion 902 is equivalent to the depth of the positioning groove 201 , and the buffer portion 901 after mounting is located at the same level as the surface of the gland 5 .

[0036] In addition, a gasket 7 is installed above the valve plate 6 to prevent the valve plate 6 from loosening.

[0037] The gasket 7 is provided with a through hole 701, the pressure cover 5 is provided with a through hole 504, the valve plate 6 is provided with a through hole 601, the mounting portion 902 is provided with a through hole 3 905, and the bottom of the positioning groove 201 is provided with a threaded hole 205, and the screw 10 passes through the through hole 701, the through hole 601, the through hole 504 and the through hole 3 905 in sequence and is locked in the threaded hole 205.

[0038] The assembly method of the piston assembly of the utility model is as follows:

[0039] First, the piston ring 4 is mounted on the guide platform 203 . Under the guidance of the guide surface 204 , the piston ring 4 can be quickly positioned at the periphery of the piston part 2 .

[0040] Next, the buffer pad 9 is installed in the positioning groove 201 on the surface of the piston part 2, so that the vent 903 and the exhaust port 8 below are vertically opposite, and the through hole 905 and the threaded hole 205 below are vertically opposite.

[0041] Then, the positioning groove 501 of the gland 5 is positioned and sleeved on the raised buffer portion 901 of the buffer pad 9, and the gland 5 is positioned relative to the piston portion 2. At this time, the through hole 203 on the gland 5 and the threaded hole 206 on the piston portion 2 are aligned vertically.

[0042] Finally, screw 10 is passed through gasket 7, valve plate 6, gland 5 and mounting portion 902 in sequence, gland 5 and buffer pad 9 are pressed tightly on top of piston portion 2, and gland 5 is further fixed by screw 2 3. At this time, the outer edge of gland 5 can press the fixed portion 401 of piston ring 4, preventing the fixed portion 401 from shifting during the displacement of piston assembly. And the movable end of valve plate 6 away from the second through hole 601 can act on the surface of buffer portion 901 of buffer pad 9.

[0043] During the exhaust process of the piston assembly, the gas sequentially acts on the lower surface of the valve plate 6 through the exhaust port 8 and the vent 903, causing the movable end of the valve plate 6 to tilt up for exhaust. During the falling process of the valve plate 6, the movable end of the valve plate 6 acts on the surface of the buffer part 901, reducing noise.

[0044] In addition, the buffer pad 9 of the utility model can improve the air tightness between the gland 5 and the piston part 2 at the exhaust port 8; the buffer part 901 of the raised buffer pad 9 can also quickly realize fast and accurate positioning between the gland 5 and the piston part 2, thereby improving the installation efficiency of the piston assembly as a whole.

[0045] To sum up, the utility model arranges a buffer pad between the piston part and the pressure cover, and the buffer pad includes a mounting part and a buffer part, wherein the locking of the pressure cover on the mounting part and the limiting effect of the pressure cover's yield groove on the buffer part can realize tight installation of the buffer pad, and can prevent the buffer pad from easily warping when being hit; wherein, the buffer part can realize fast and accurate positioning between the pressure cover and the piston part, thereby improving the installation efficiency of the piston assembly as a whole, and in the process of the valve plate falling back, the movable end of the valve plate acts on the surface of the buffer part, thereby reducing the operating noise of the piston assembly; in addition, the buffer pad can also improve the airtightness of the pressure cover and the piston part at the exhaust port, thereby enhancing the one-way exhaust effect.

[0046] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A piston assembly of an air compressor, comprising an integrally cast connecting rod portion (1) and a piston portion (2), a piston ring (4) being mounted on the piston portion (2), a gland (5) being arranged above the piston ring (4) and capable of pressing the piston ring (4) against the surface of the piston portion (2), an exhaust port (8) being arranged on the piston portion (2), a valve plate (6) being arranged on the surface of the gland (5) by means of a screw (10) and capable of acting on the exhaust port (8), characterized in that: The surface of the piston part (2) is provided with a positioning groove (201), a buffer pad (9) is installed in the positioning groove (201), the buffer pad (9) includes a mounting part (902) and a buffer part (901) extending to the top of the exhaust port (8), the pressure cover (5) is provided with a clearance groove (501) capable of clamping the buffer part (901), the buffer part (901) is provided with a vent (903) directly opposite to the exhaust port (8), the projection of the movable end of the valve plate (6) toward one side of the buffer part (901) is located inside the buffer part (901), the valve plate (6) hits the surface of the buffer part (901) when exhausting, and the screw (10) passes through the valve plate (6), the pressure cover (5), the mounting part (902) and the piston part (2) in sequence from top to bottom.

2. The piston assembly of an air compressor according to claim 1, characterized in that: The outer edge of the buffer portion (901) is configured as a stepped platform (904), and the groove wall of the clearance groove (501) is configured as a stepped groove wall (5011) that can cooperate with the stepped platform (904), and the stepped groove wall (5011) can limit the position of the stepped platform (904).

3. The piston assembly of an air compressor according to claim 1, characterized in that: The piston part (2) comprises a support platform (202) and a guide platform (203) coaxially arranged above the support platform (202); the bottom of the pressure cover (5) is provided with a limiting groove (502) capable of cooperating with the guide platform (203); the side wall of the guide platform (203) is constructed as a guide surface (404) that converges inward from bottom to top; and the internal diameter of the piston ring (4) is equivalent to the bottom diameter of the guide platform (203).

4. The piston assembly of an air compressor according to claim 3, characterized in that: The piston ring (4) comprises a fixing portion (401) and a sealing portion (402), wherein the fixing portion (401) cooperates with the annular planar structure of the support platform (202) and is fixed by being compressed by a pressure cover (5), wherein the sealing portion (402) extends upward to wrap around the edge of the pressure cover (5), and a gap is formed between the sealing portion (402) and the outer wall of the pressure cover (5).

5. The piston assembly of an air compressor according to claim 1, characterized in that: The thickness of the mounting portion (902) is equivalent to the depth of the positioning groove (201), and after installation, the buffer portion (901) and the surface of the gland (5) are located at the same level.

6. The piston assembly of an air compressor according to claim 1, characterized in that: A gasket (7) is installed above the valve plate (6), and a through hole 1 (701) is provided on the gasket (7), a through hole 5 (504) is provided on the pressure cover (5), a through hole 2 (601) is provided on the valve plate (6), a through hole 3 (905) is provided on the mounting portion (902), and a threaded hole 1 (205) is provided at the bottom of the positioning groove (201), and the screw 1 (10) passes through the through hole 1 (701), the through hole 2 (601), the through hole 5 (504) and the through hole 3 (905) in sequence and is locked in the threaded hole 1 (205).

7. The piston assembly of an air compressor according to claim 1, characterized in that: The surface of the piston part (2) is symmetrically provided with threaded holes (206) on both sides, and the pressure cover (5) is provided with through holes (503) at positions corresponding to the threaded holes (206). Two screws (3) are sequentially passed through the through holes (503) on the corresponding sides and locked in the threaded holes (206).

8. The piston assembly of an air compressor according to claim 1, characterized in that: The buffer pad (9) may be made of rubber material.

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