Abrasion-resistant pneumatic double-acting piston main sealing piece with long service life

Abstract

The pneumatic double-acting piston main sealing piece is long in service life and resistant to abrasion and comprises a connecting part, a sealing part and a sealing part, and the connecting part is matched with a mounting groove formed in a piston of an air cylinder; the top boss is fixedly connected with the connecting part and located on the side, away from the groove bottom of the mounting groove, of the connecting part, and the side, away from the connecting part, of the top boss is arranged to be an arc face; on one hand, the sealing piece can have a stable contact surface with the inner wall of the cylinder body of the air cylinder due to the arc-shaped top boss; on the other hand, the contact area of the sealing piece and the inner wall of the cylinder body of the air cylinder is not prone to being too large, meanwhile, damage to the sealing amount of the sealing piece can be compensated through the design of the top boss arc face, the friction force is reduced, the abrasion resistance is improved, the sealing effect of the sealing piece can be guaranteed, and the long-service-life abrasion-resistant function is achieved; therefore, the purpose of solving the problem that the service life of the air cylinder is shortened due to accelerated abrasion and distortion of the sealing element caused by a gap between the sealing element and the mounting groove in the operation process of the air cylinder is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of seals, and in particular to a pneumatic double-acting piston main seal with a long service life and wear resistance. Background Art

[0002] As a highly versatile actuator, standard cylinders can provide stable, fast and green power and are widely used in various light industries, especially in the food industry, the electronics industry and the automotive industry. The equipment in these industries usually runs 24 hours a day and has high requirements for the operating life of the cylinders, requiring at least 10 million reciprocating times or a cumulative operating distance of 3,000 km.

[0003] At present, the domestic standard cylinder generally uses a single-acting Y-type seal ring (single-acting means that it can only seal in one direction. If a double-acting sealing effect is required, two back-to-back installations are required). The seal and the mounting groove on the piston are installed by means of inner diameter interference, and the outer lip plays a sealing role. During operation, the gap between the seal and the mounting groove will cause the seal to wear and twist faster, reducing the service life of the cylinder. Utility Model Content

[0004] In order to improve the problem that the gap between the seal and the mounting groove during the operation of the cylinder may cause the seal to wear and twist faster and reduce the service life of the cylinder, the present application provides a pneumatic double-acting piston main seal with a long service life and wear resistance.

[0005] The present application provides a pneumatic double-acting piston main seal with a long service life and wear resistance, which adopts the following technical solution:

[0006] A pneumatic double-acting piston main seal with long service life and wear resistance, comprising:

[0007] A connecting portion adapted to fit into a mounting groove provided on a piston of the cylinder;

[0008] The top boss is fixedly connected to the connecting portion and is located on a side of the connecting portion away from the bottom of the mounting groove. The side of the top boss away from the connecting portion is configured as an arc surface.

[0009] Furthermore, along the piston length direction of the cylinder, the size of the top boss is smaller than the size of the connecting portion.

[0010] Furthermore, a plurality of buffer bosses are fixedly connected to the peripheral side of the connecting portion, and adjacent buffer bosses are arranged at intervals.

[0011] Furthermore, a groove is provided on the peripheral side wall of the connecting portion along its circumference, and the groove is located on a side of the buffer boss close to the bottom of the groove.

[0012] Furthermore, the cross section of the groove is set to be trapezoidal.

[0013] Furthermore, the angle between the side of the groove facing away from the bottom of the installation groove is a right angle.

[0014] Furthermore, two mounting bosses are arranged on one side of the connecting portion close to the bottom of the mounting groove, and the cross-section of the mounting bosses is arranged to be semicircular.

[0015] Furthermore, a groove is formed on one side of the connecting portion close to the bottom of the mounting groove, and the groove spans across the two mounting bosses.

[0016] To sum up, the beneficial technical effects of the present application are as follows: the arc-shaped setting of the top boss enables the seal to have a stable contact surface with the inner wall of the cylinder body; on the other hand, it also makes the contact area between the seal and the inner wall of the cylinder body not too large. At the same time, the design of the arc surface of the top boss can compensate for the damage to the sealing amount of the seal, while reducing friction and improving wear resistance, it can ensure the sealing effect of the seal and achieve long-life wear-resistant function; thereby achieving the purpose of the present application to improve the gap between the seal and the mounting groove during the operation of the cylinder, which will cause the seal to wear and twist faster, thereby reducing the service life of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of an embodiment of the present application.

[0018] Figure 2 It is a top view of an embodiment of the present application.

[0019] Figure numerals: 100, connecting part; 110, groove; 200, top boss; 300, buffer boss; 400, mounting boss; 410, groove; 500, piston; 510, mounting groove. DETAILED DESCRIPTION

[0020] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0021] The present application embodiment discloses a pneumatic double-acting piston main seal with a long service life and wear resistance. Figure 1 and Figure 2The seal includes a top boss 200, a connecting portion 100, a buffer boss 300 and a mounting boss 400 which are integrally formed, wherein the top boss 200, the connecting portion 100 and the mounting boss 400 are sequentially arranged along the bottom direction of the mounting groove 510 close to the cylinder piston 500.

[0022] The connecting portion 100 is adapted to the mounting groove 510 provided on the piston 500 of the cylinder. The side of the top boss 200 facing away from the connecting portion 100 is arranged in an arc shape, so that on the one hand, the sealing member can have a stable contact surface with the inner wall of the cylinder body; on the other hand, the contact area between the sealing member and the inner wall of the cylinder body is not too large.

[0023] Along the axial direction of the piston 500 of the cylinder, the size of the top boss 200 is smaller than the size of the connecting portion 100, so that both ends of the top boss 200 do not extend beyond the two ends of the connecting portion 100, that is, the two sides of the top boss 200 are free from the inner wall of the cylinder body, thereby further reducing the friction between the top boss 200 and the inner wall of the cylinder body, thereby reducing the pressure when the cylinder is started.

[0024] There are multiple buffer bosses 300, which are fixedly connected to the outer peripheral wall of the connecting portion 100. In this embodiment, there are 8 buffer bosses 300, and the buffer bosses 300 are evenly arranged along the circumference of the connecting portion 100, and adjacent buffer bosses 300 are arranged at intervals. In this application, the adjacent buffer bosses 300 are arranged at intervals so that excess gas can be discharged from the gaps between the buffer bosses 300, so that it is not easy to have a local vacuum during the reciprocating motion of the seal driven by the cylinder piston 500.

[0025] Grooves 110 extending circumferentially of the connecting portion 100 are provided on both sides of the connecting portion 100. The cross-section of the grooves 110 is set to be trapezoidal, and the grooves 110 are all located in the middle of the connecting portion 100, so that the seal can have sufficient deformation space. On the one hand, when the ambient temperature increases, the seal will not easily have the risk of cylinder expansion due to thermal expansion and contraction of the material; on the other hand, it makes the installation of the seal more convenient.

[0026] The cross-sectional area of ​​the groove 110 gradually increases in the direction close to the notch of the groove 110, so as to facilitate the processing of the seal. The angle of the groove 110 away from the bottom of the installation groove 510 and close to the center line of the connecting part 100 is set to a right angle, and the side of the groove 110 close to the bottom of the installation groove 510 is set to an inclined surface, so that the groove 110 is not easy to affect the support of the connecting part 100 on the top boss 200, and the setting of the inclined surface of the groove 110 makes the installation of the seal more stable.

[0027] Two mounting bosses 400 are provided, and the side surfaces of the two mounting bosses 400 close to the bottom of the mounting groove 510 are both arranged as arc surfaces. A groove 410 along its circumference is opened on one side of the connecting portion 100 close to the bottom of the mounting groove 510, and the groove 410 spans across the two mounting bosses 400. The arrangement of the groove 410 further increases the deformation space of the seal, thereby making the seal easier to install.

[0028] In the present application, the seal is made of standard polyurethane material with a hardness of ShA 82, so that the arc-shaped design of the top boss is combined with the characteristics of the polyurethane material itself to further improve the wear resistance of the seal.

[0029] The implementation principle of the pneumatic double-acting piston main seal with a long service life and wear resistance in the embodiment of the present application is: the staff installs the seal in the installation groove so that the seal can seal the reciprocating motion of the piston of the cylinder.

[0030] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pneumatic double-acting piston main seal with a long service life and wear resistance, characterized in that: include: The connecting portion (100) is adapted to fit into a mounting groove (510) provided on the piston (500) of the cylinder; The top boss (200) is fixedly connected to the connecting portion (100) and is located on a side of the connecting portion (100) away from the bottom of the mounting groove (510), and the side of the top boss (200) away from the connecting portion (100) is configured as a curved surface.

2. A pneumatic double-acting piston main seal with a long service life and wear resistance according to claim 1, characterized in that: Along the length direction of the piston (500) of the cylinder, the size of the top boss (200) is smaller than the size of the connecting portion (100).

3. A pneumatic double-acting piston main seal with a long service life and wear resistance according to claim 1, characterized in that: A plurality of buffer bosses (300) are fixedly connected on the peripheral side of the connection portion (100), and adjacent buffer bosses (300) are arranged at intervals.

4. A pneumatic double-acting piston main seal with a long service life and wear resistance according to claim 3, characterized in that: A groove (110) is provided on the peripheral side wall of the connection portion (100) along its circumferential direction, and the groove (110) is located on a side of the buffer boss (300) close to the bottom of the groove (110).

5. A pneumatic double-acting piston main seal with a long service life and wear resistance according to claim 4, characterized in that: The cross section of the groove (110) is arranged to be trapezoidal.

6. A pneumatic double-acting piston main seal with a long service life and wear resistance according to claim 4, characterized in that: The angle between the side of the groove (110) facing away from the bottom of the installation groove (510) is a right angle.

7. A pneumatic double-acting piston main seal with a long service life and wear resistance according to claim 1, characterized in that: Two mounting bosses (400) are provided on one side of the connection portion (100) close to the bottom of the mounting groove (510), and the cross-section of the mounting bosses (400) is arranged in a semicircular shape.

8. A pneumatic double-acting piston main seal with a long service life and wear resistance according to claim 7, characterized in that: A groove (410) is provided on one side of the connection portion (100) close to the bottom of the mounting groove (510), and the groove (410) spans across the two mounting bosses (400).

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