Vacuum pump seal structure

Abstract

The utility model relates to a vacuum pump technical field, concretely is a kind of vacuum pump sealing structure. Including: shell, inside is provided with several cavity;Piston, is set in cavity;Sealing assembly, cover in the outer end of shell, and sealing connection with cavity;Sealing assembly includes: bottom plate, is set with air inlet and exhaust hole;Baffle, is set on bottom plate;Partition, is set between baffle and bottom plate, and between baffle and shell;Partition is set with one-way conducting mechanism, air inlet and exhaust hole are communicated with cavity by one-way conducting mechanism. Bottom plate includes: first plate body, air inlet and exhaust hole are set on first plate body;Air inlet flow channel, set on first plate body, connect air inlet and cavity;Exhaust flow channel, set on first plate body, connect exhaust hole and cavity. It has good cavity sealing performance, and can be effectively matched with cavity and piston, realize the one-way flow control of air flow.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, specifically a vacuum pump sealing structure. Background Technology

[0002] Vacuum pumps, as key basic equipment in modern industry, play a crucial role in creating and maintaining a vacuum environment within a sealed container or system. Piston vacuum pumps are a widely used type, favored for their simple structure, low cost, and ease of maintenance. The performance, lifespan, and efficiency of this type of pump largely depend on its sealing structure and gas path control method. Traditional piston vacuum pumps typically consist of a pump casing, a reciprocating piston, and valves controlling the unidirectional flow of gas. However, this conventional design has several inherent shortcomings: (1) Traditional check valves are prone to fatigue fracture or excessive wear under the high-frequency impact and alternating pneumatic load brought about by the high-speed movement of the piston, which leads to sealing failure.

[0003] (2) In order to achieve unidirectional control of the intake and exhaust processes, it is usually necessary to set up intake valves and exhaust valves separately, and equip them with corresponding valve seats, limiters and other parts. The assembly of multiple components not only increases the complexity of the structure and the overall volume, but also causes the gas flow channel to be tortuous, the flow path to be long and the flow resistance to be large, which ultimately affects the pumping efficiency and energy utilization of the vacuum pump. Utility Model Content

[0004] In order to solve the technical problems existing in the background art, the present invention provides a vacuum pump sealing structure, which has good cavity sealing performance and can effectively cooperate with the cavity and piston to realize unidirectional flow control of airflow.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A vacuum pump sealing structure, comprising: The shell has several cavities inside; Piston, located inside the cavity; A sealing assembly covers the outer end of the housing and is sealed to the cavity; The sealing assembly includes: The base plate has air inlet and air outlet openings; A baffle is installed on the base plate; A partition is provided between the baffle and the bottom plate, and between the baffle and the shell; The partition is equipped with a one-way flow mechanism, through which the air inlet and outlet are connected to the cavity.

[0006] Furthermore, the base plate includes: The first plate has an air inlet and an exhaust outlet. An air intake channel is formed on the first plate, connecting the air intake hole and the cavity; An exhaust channel is formed on the first plate, connecting the exhaust port and the cavity.

[0007] Furthermore, the baffle includes: Third plate; The air intake port assembly is located on the third plate and between the air intake channel and the cavity; The exhaust port assembly is located on the third plate and between the exhaust channel and the cavity.

[0008] Furthermore, the partition includes: Second plate; The sealing ear is cantilevered and movable on the second plate, and can cover the air intake or exhaust port group, so that the air intake or exhaust port group can be unidirectionally opened. A through hole is formed in the second plate and is connected to the exhaust hole group or the air inlet hole group.

[0009] Furthermore, the base plate also includes: The first groove and the second groove are formed on the first plate and located at both ends of the exhaust channel; The positions of the first and second grooves correspond to the sealing ears on the partition plate located between the baffle and the bottom plate.

[0010] Furthermore, the piston is fixedly connected to a connecting rod, and a push rod is fixedly connected to the end of the connecting rod away from the piston; A spring is fitted onto the connecting rod, with its two ends abutting against the housing and the top column, respectively. The housing is provided with a rotatable shaft, and a cam is fixedly mounted on the shaft. The profile surface of the cam abuts against the top column.

[0011] The beneficial effects of this utility model are: (1) Independent intake and exhaust channels are integrated on the base plate, which effectively separates and guides the intake and exhaust paths. This helps to reduce gas cross-flow and dead zone volume inside the pump, thereby improving the efficiency of airflow organization.

[0012] (2) The baffle is equipped with an inlet port group and an exhaust port group, corresponding to the corresponding flow channels on the base plate. Combined with the unidirectional flow mechanism formed by the cantilevered sealing ears on the baffle, it ensures that external gas can only enter along the following path: inlet port → inlet flow channel → inlet port group → push open the sealing ears to enter the cavity. At the same time, the gas exhaust path in the cavity is: exhaust port group → push open the sealing ears on the other side → exhaust flow channel → exhaust port. This can improve the pumping efficiency and vacuum level of the vacuum pump.

[0013] (3) The unidirectional conduction mechanism is achieved by directly machining the sealing ears of the cantilever beam structure on the partition plate, without the need for additional parts, resulting in a compact structure. Moreover, the sealing ears open and close by utilizing the elasticity of the material itself, making the action sensitive and the response fast, and able to adapt to the high-frequency movement of the piston. While reducing the number of parts and assembly complexity, it also reduces the failure rate and improves the reliability and service life of the whole machine.

[0014] (4) A first groove and a second groove are provided at the position of the reciprocating motion of the sealing ear on the base plate to provide clearance for the movement of the sealing ear and avoid direct rigid impact with the base plate plane. This helps to reduce impact stress and wear, extend the service life of the sealing ear and the base plate, and ensure the sealing stability during long-term operation. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a diagram showing the usage state of this utility model; Figure 2 This is an exploded view of the sealing assembly; Figure 3 This is a schematic diagram of the shell structure; Figure 4 This is a structural diagram of the base plate. Figure 1 ; Figure 5 This is a structural diagram of the base plate. Figure 2 ; Figure 6 This is a schematic diagram of the partition structure; Figure 7 This is a schematic diagram of the baffle structure.

[0017] In the picture: 1. Sealing assembly, 2. Housing, 3. Piston, 4. Connecting rod, 5. Spring, 6. Top pin, 7. Shaft, 8. Cam; 11. Base plate; 12. Partition plate; 13. Baffle plate; 21. Cavity; 111. First plate; 112. Air inlet; 113. Exhaust outlet; 114. Air inlet channel; 115. Exhaust channel; 116. First groove; 117. Second groove; 121. Second plate; 122. Sealing lug; 123. Through hole; 131. Third plate, 132. Air inlet group, 133. Exhaust port group. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] like Figure 1, 3 As shown, a vacuum pump sealing structure includes a housing 2 with several cavities 21 inside. A piston 3 is disposed within a cavity 21. A sealing assembly 1 covers the outer end of the housing 2 and is sealed to the cavity 21. A connecting rod 4 is fixedly connected to the piston 3, and a top post 6 is fixedly connected to the end of the connecting rod 4 away from the piston 3. A spring 5 is sleeved on the connecting rod 4, with its two ends abutting against the housing 2 and the top post 6, respectively. A rotatable shaft 7 is disposed on the housing 2, and a cam 8 is fixedly disposed on the shaft 7, with the profile surface of the cam 8 abutting against the top post 6. Rotation of the shaft 7 generates a vacuum within the cavity 21.

[0020] like Figure 2 As shown, the sealing assembly 1 includes a base plate 11 with an air inlet 112 and an exhaust port 113. A baffle 13 is disposed on the base plate 11. A partition 12 is disposed between the baffle 13 and the base plate 11, and between the baffle 13 and the housing 2. The partition 12 has a one-way flow mechanism, through which the air inlet 112 and the exhaust port 113 communicate with the cavity 21.

[0021] like Figure 4 , 5 As shown, the specific structure of the base plate 11 includes a first plate 111, an air inlet 112, and an exhaust outlet 113 formed on the first plate 111. An air inlet channel 114 is formed on the first plate 111, connecting the air inlet 112 and the cavity 21. An exhaust channel 115 is formed on the first plate 111, connecting the exhaust outlet 113 and the cavity 21. The integration of the independent air inlet channel 114 and exhaust channel 115 on the base plate 11 effectively separates and guides the air intake and exhaust paths. This helps reduce gas cross-flow and dead zone volume within the pump, thereby improving the efficiency of airflow organization.

[0022] like Figure 7 As shown, the specific structure of the baffle 13 includes a third plate 131. An air inlet group 132 is formed on the third plate 131 and is located between the air inlet channel 114 and the cavity 21. An exhaust port group 133 is formed on the third plate 131 and is located between the exhaust channel 115 and the cavity 21.

[0023] like Figure 6As shown, the specific structure of the partition 12 includes a second plate 121. A sealing ear 122, cantilevered and movably formed on the second plate 121, covers the air inlet group 132 or the exhaust group 133, allowing unidirectional flow of either the air inlet group 132 or the exhaust group 133. This unidirectional flow mechanism is achieved by directly machining the cantilever beam structure of the sealing ear 122 onto the partition 12, eliminating the need for additional parts and resulting in a compact structure. Furthermore, the sealing ear 122 utilizes the elasticity of the material itself to open and close, exhibiting sensitive and rapid action, capable of adapting to the high-frequency movement of the piston. This reduces the number of parts and assembly complexity, while also lowering the failure rate and improving the overall reliability and service life of the machine.

[0024] A through-hole 123 is formed in the second plate 121 and communicates with either the exhaust port group 133 or the inlet port group 132. The baffle 13 is provided with an inlet port group 132 and an exhaust port group 133, corresponding to the corresponding flow channels on the base plate 11. Combined with the unidirectional flow mechanism formed by the cantilevered sealing ears 122 on the partition 12, external gas can only enter along the following path: inlet port 112 → inlet flow channel 114 → inlet port group 132 → push open sealing ear 122 to enter the cavity 21. Simultaneously, the gas exhaust path within the cavity 21 is: exhaust port group 133 → push open the other sealing ear 122 → exhaust flow channel 115 → exhaust port 113. This improves the pumping efficiency and vacuum level of the vacuum pump.

[0025] The base plate 11 also includes a first groove 116 and a second groove 117, which are formed on the first plate 111 and located at both ends of the exhaust channel 115. The positions of the first groove 116 and the second groove 117 correspond to the sealing ears 122 disposed on the partition 12 between the baffle 13 and the base plate 11. The first groove 116 and the second groove 117, which are provided on the base plate 11 at the positions corresponding to the reciprocating movement of the sealing ears, provide clearance space for the movement of the sealing ears 122, preventing them from directly and rigidly impacting the plane of the base plate 11. This helps to reduce impact stress and wear, extend the service life of the sealing ears 122 and the base plate 11, and ensure the sealing stability during long-term operation.

[0026] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A vacuum pump sealing structure, characterized in that, include: The shell (2) has several cavities (21) inside. Piston (3) is disposed in the cavity (21); A sealing assembly (1) covers the outer end of the housing (2) and is sealed to the cavity (21); The sealing assembly (1) includes: The base plate (11) has an air inlet (112) and an exhaust outlet (113). A baffle (13) is disposed on the base plate (11); A partition (12) is disposed between the baffle (13) and the bottom plate (11), and between the baffle (13) and the housing (2); The partition (12) is provided with a one-way flow mechanism, and the air inlet (112) and the exhaust outlet (113) are connected to the cavity (21) through the one-way flow mechanism.

2. The vacuum pump sealing structure according to claim 1, characterized in that, The base plate (11) includes: The first plate (111) has an air inlet (112) and an exhaust outlet (113) on it. An air intake channel (114) is provided on the first plate (111) and connects the air intake hole (112) with the cavity (21). An exhaust channel (115) is provided on the first plate (111) and connects the exhaust hole (113) with the cavity (21).

3. The vacuum pump sealing structure according to claim 2, characterized in that, The baffle (13) includes: Third plate (131); An air inlet assembly (132) is provided on the third plate (131) and located between the air inlet channel (114) and the cavity (21); An exhaust port assembly (133) is provided on the third plate (131) and located between the exhaust channel (115) and the cavity (21).

4. The vacuum pump sealing structure according to claim 3, characterized in that, The partition (12) includes: Second plate (121); The sealing ear (122) is cantilevered and movable on the second plate (121), and can cover the air inlet group (132) or the exhaust group (133), so that the air inlet group (132) or the exhaust group (133) can be unidirectionally open. A through hole (123) is provided in the second plate (121) and is connected to the exhaust hole group (133) or the air inlet hole group (132).

5. A vacuum pump sealing structure according to claim 4, characterized in that, The base plate (11) also includes: The first groove (116) and the second groove (117) are formed on the first plate (111) and located at both ends of the exhaust channel (115); The positions of the first groove (116) and the second groove (117) correspond to the sealing ears (122) disposed on the partition (12) between the baffle (13) and the bottom plate (11).

6. The vacuum pump sealing structure according to claim 1, characterized in that, The piston (3) is fixedly connected to a connecting rod (4), and a top column (6) is fixedly connected to one end of the connecting rod (4) away from the piston (3). A spring (5) is sleeved on the connecting rod (4), and the two ends of the spring (5) abut against the housing (2) and the top column (6) respectively; The housing (2) is provided with a rotatable shaft (7), and a cam (8) is fixedly provided on the shaft (7). The profile surface of the cam (8) abuts against the top column (6).

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