Sealing structure of air cylinder piston

Abstract

The utility model belongs to the technical field of air cylinders, and particularly relates to a sealing structure of an air cylinder piston, which comprises a piston, the piston is arranged in a cylinder body in a sliding manner, two groups of sealing grooves are oppositely arranged on the circumferential surface of the piston, inflatable rubber rings are fixedly arranged in the sealing grooves, and a Y-shaped sealing ring is fixedly arranged on one side of each inflatable rubber ring. The Y-shaped sealing ring is arranged in the sealing groove in a sliding mode, a plurality of sets of air channels are formed in the two sides of the piston, air inlet plates are fixedly arranged in the air channels, fixing frames are fixedly arranged in the air channels, movable rods are arranged on the fixing frames in a sliding and penetrating mode, plugs are fixedly arranged at the ends, close to the air inlet plates, of the movable rods, and air inlet holes are formed in the air inlet plates. Through the cooperation of the structure, the pressure applied to the Y-shaped sealing ring by the inflatable rubber ring is uniform, the pressure applied to the inner wall of the cylinder body at each position of the Y-shaped sealing ring is consistent, the sealing effect of the piston is improved, and normal work of the cylinder is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of cylinders, in particular to a sealing structure of a cylinder piston. Background Art

[0002] The cylinder is an important mechanical component used to convert the energy of compressed air into mechanical motion. The cylinder is widely used in industrial automation, machinery manufacturing, metallurgy, textile, chemical industry and other fields for pushing, pulling, positioning and other tasks. It has a simple structure, is easy to control and maintain, and is an indispensable part of the automation system.

[0003] A Chinese patent with announcement number CN211599143U discloses a sealing structure for a cylinder piston, including a cylinder body, a piston and a piston sealing ring; the upper surface and the lower surface of the piston sealing ring are both provided with annular grooves; a plurality of magnetic blocks are installed in the annular groove; the magnetic block is cylindrical and is arranged pointing to the center of the annular groove; a spring is sheathed on the outside of the magnetic block; the sealing between the piston sealing ring and the cylinder sleeve is greatly enhanced.

[0004] The sealing structure of the above-mentioned cylinder piston still has some problems in use. First, the magnetic force between the magnetic block and the cylinder barrel is used to push the piston sealing ring to the inner wall of the cylinder barrel. The magnetism of the magnetic block will gradually weaken over time, or other external environmental factors will also cause magnetic attenuation, which will lead to a decrease in the sealing performance of the piston sealing ring. At the same time, the above-mentioned patent also uses the thrust of the spring to make the sealing ring stick to the inner wall of the cylinder barrel, but the contact area between the spring and the sealing ring is limited, so that only the place where the sealing ring contacts the spring is pressed against the inner wall of the barrel, while the place where the spring does not apply thrust is weakly in contact with the inner wall of the barrel, which is prone to leakage, resulting in a decrease in sealing performance. The practicality is low, and the sealing structure of the above-mentioned cylinder piston does not effectively solve these problems; therefore, a sealing structure of a cylinder piston is proposed to address the above problems. Utility Model Content

[0005] In order to make up for the deficiencies of the existing sealing structure of the cylinder piston, a sealing structure for the cylinder piston is proposed to compensate for the deficiencies of the existing sealing structure of the cylinder piston, solve the problem that the magnetism of the magnetic block will gradually weaken over time, or other external environmental factors will also cause magnetic attenuation, which will further lead to a decrease in the sealing performance of the piston sealing ring, and the contact area between the spring and the sealing ring is limited, so that only the place where the sealing ring contacts the spring is pressed against the inner wall of the cylinder, while the place where there is no thrust applied by the spring has a weaker contact with the inner wall of the cylinder, which is prone to leakage, resulting in a decrease in sealing performance and low practicality.

[0006] The technical solution adopted by the utility model to solve its technical problems is: the sealing structure of a cylinder piston described in the utility model comprises a piston, the piston is slidably arranged inside a cylinder body, two sets of sealing grooves are oppositely provided on the circumferential surface of the piston, an inflatable rubber ring is fixedly arranged in the sealing groove, a Y-shaped sealing ring is fixedly arranged on one side of the inflatable rubber ring, the Y-shaped sealing ring is slidably arranged in the sealing groove, a plurality of air channels are provided on both sides of the piston, an air intake plate is fixedly arranged in the air channel, a fixing frame is fixedly arranged in the air channel, a movable rod is slidably penetrated on the fixing frame, a plug is fixedly provided on one end of the movable rod close to the air intake plate, an air intake hole is provided on the air intake plate, and a return spring is terminated between the fixing frame and the air intake plate.

[0007] Preferably, the end surface of the plug close to the air inlet plate is in an inverted cone shape, and one end of the air inlet hole close to the plug is provided with a groove that fits the inverted cone structure of the plug.

[0008] Preferably, a fixing groove is provided on the circumferential surface of the piston, and a wear-resistant belt is fixedly arranged in the fixing groove.

[0009] Preferably, a piston rod is fixedly mounted on the piston, and an upper end cover and a lower end cover are fixedly mounted on both ends of the cylinder body respectively.

[0010] Preferably, buffer sleeves are fixedly provided on both sides of the piston.

[0011] Preferably, the four corners of the upper end cover and the lower end cover are fixedly connected via tie rods and tie rod nuts.

[0012] Beneficial effects of the utility model:

[0013] The utility model provides a sealing structure of a cylinder piston, gas enters into the cylinder body and forms air pressure, the gas enters into the airway, and then under the action of the gas pressure, the plug is pushed to move, so that the air inlet hole is opened, and the gas enters into the inflatable rubber ring through the air inlet hole, the inflatable rubber ring is stretched and expanded by the gas, the inflatable rubber ring is deformed and pushes the Y-shaped sealing ring to fit firmly on the inner wall of the cylinder body, and the pressure applied by the inflatable rubber ring to the Y-shaped sealing ring is uniform, so that the pressure applied by each part of the Y-shaped sealing ring on the inner wall of the cylinder body is consistent, thereby improving the sealing effect of the piston, and at the same time, the structural characteristics of the Y-shaped sealing ring further improve the sealing performance, thereby ensuring the normal operation of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0015] Figure 1It is a cross-sectional view of the whole;

[0016] Figure 2 It is an enlarged structural diagram of the piston position;

[0017] Figure 3 yes Figure 2 The enlarged structure diagram at A in the middle;

[0018] Legend:

[0019] 1. Piston; 2. Cylinder body; 3. Sealing groove; 4. Inflatable rubber ring; 5. Y-type sealing ring; 6. Air duct; 7. Inlet plate; 8. Fixed frame; 9. Movable rod; 10. Plug; 11. Inlet hole; 12. Return spring; 13. Fixed groove; 14. Wear-resistant belt; 15. Piston rod; 16. Buffer sleeve; 17. Upper end cover; 18. Lower end cover; 19. Tie rod nut. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Specific examples are given below.

[0022] See also Figure 1-Figure 3The utility model discloses a sealing structure of a cylinder piston, comprising a piston 1, wherein the piston 1 is slidably arranged inside a cylinder body 2, wherein two sets of sealing grooves 3 are oppositely provided on the circumferential surface of the piston 1, wherein an inflatable rubber ring 4 is fixedly provided inside the sealing groove 3, wherein a Y-shaped sealing ring 5 is fixedly provided on one side of the inflatable rubber ring 4, wherein the Y-shaped sealing ring 5 is slidably provided inside the sealing groove 3, wherein two sets of air passages 6 are provided on both sides of the piston 1, wherein an air inlet plate 7 is fixedly provided inside the air passage 6, wherein a fixing frame 8 is fixedly provided inside the air passage 6, wherein the ... A movable rod 9 is slidably provided on the frame 8, and a plug 10 is fixedly provided at one end of the movable rod 9 close to the air inlet plate 7. An air inlet hole 11 is provided on the air inlet plate 7. A return spring 12 is terminated between the fixed frame 8 and the air inlet plate 7. The end surface of the plug 10 close to the air inlet plate 7 is an inverted cone, and a groove that fits the inverted cone structure of the plug 10 is provided at one end of the air inlet hole 11 close to the plug 10. A piston rod 15 is fixedly mounted on the piston 1, and an upper end cover 17 and a lower end cover 18 are fixedly mounted at both ends of the cylinder body 2. Buffer sleeves 16 are fixedly provided on both sides of the piston 1, and the four corners of the upper end cover 17 and the lower end cover 18 are fixedly connected by tie rods and tie rod nuts 19. When working, in order to solve the defects of the prior art in the background technology, when the cylinder is working, gas enters the cylinder body 2 and forms air pressure, and the gas enters the airway 6, and then under the action of the gas pressure, the plug 10 is pushed to move, and the plug 10 drives the movable rod 9 to move, and at the same time the reset spring 12 is compressed, and the air inlet 11 is opened, and the gas enters the inflatable rubber ring 4 through the air inlet 11, and the inflatable The air rubber ring 4 is stretched and expanded by the gas, and the air-filled rubber ring 4 is deformed and pushes the Y-shaped sealing ring 5 to fit firmly on the inner wall of the cylinder body 2. The air-filled rubber ring 4 applies a uniform pressure to the Y-shaped sealing ring 5, so that the pressure applied by each part of the Y-shaped sealing ring 5 on the inner wall of the cylinder body 2 is consistent, thereby improving the sealing effect of the piston 1. Under the elastic potential energy of the return spring 12, the gas can only enter the air-filled rubber ring 4 without being lost, thereby playing the role of a one-way valve. At the same time, the structural characteristics of the Y-shaped sealing ring 5 further improve the sealing performance, thereby ensuring the normal operation of the cylinder.

[0023] Furthermore, a fixing groove 13 is provided on the circumferential surface of the piston 1, and a wear-resistant belt 14 is fixedly arranged in the fixing groove 13. During operation, the wear-resistant belt 14 arranged on the piston 1 cooperates to ensure the stable guidance of the piston 1 in the cylinder body 2 when the piston 1 moves, absorb radial force, prevent metal contact and wear, reduce friction, and thus extend the service life of the cylinder.

[0024] Working principle: In order to solve the defects of the prior art in the background technology, when the cylinder is working, gas enters the cylinder body 2 and forms air pressure, and the gas enters the airway 6, and then under the action of the gas pressure, the plug 10 is pushed to move, and the plug 10 drives the movable rod 9 to move, and the reset spring 12 is compressed, and the air inlet 11 is opened, and the gas enters the inflatable rubber ring 4 through the air inlet 11, and the inflatable rubber ring 4 is stretched and expanded by the gas, and the inflatable rubber ring 4 is deformed and pushes the Y-shaped sealing ring 5 to fit firmly on the inner wall of the cylinder body 2, and the pressure applied by the inflatable rubber ring 4 to the Y-shaped sealing ring 5 is uniform, The pressure applied by the Y-shaped sealing ring 5 to the inner wall of the cylinder body 2 at each location is consistent, thereby improving the sealing effect of the piston 1. Under the elastic potential energy of the return spring 12, the gas can only enter the inflatable rubber ring 4 without being lost, thereby playing the role of a one-way valve. At the same time, the structural characteristics of the Y-shaped sealing ring 5 further improve the sealing performance and ensure the normal operation of the cylinder. Through the cooperation of the wear-resistant belt 14 provided on the piston 1, the stable guidance of the piston 1 in the cylinder body 2 is ensured when the piston 1 moves, the radial force is absorbed, metal contact and wear are prevented, and the friction is reduced, thereby extending the service life of the cylinder.

[0025] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0026] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A sealing structure for a cylinder piston, characterized in that: The invention comprises a piston (1), wherein the piston (1) is slidably arranged inside a cylinder body (2), and two sets of sealing grooves (3) are oppositely provided on the circumferential surface of the piston (1), and an inflatable rubber ring (4) is fixedly arranged inside the sealing groove (3), and a Y-shaped sealing ring (5) is fixedly arranged on one side of the inflatable rubber ring (4), and the Y-shaped sealing ring (5) is slidably arranged inside the sealing groove (3). Two sets of air passages (6) are provided on both sides of the piston (1), and an air intake plate (7) is fixedly arranged inside the air passage (6), and a fixing frame (8) is fixedly arranged inside the air passage (6), and a movable rod (9) is slidably arranged on the fixing frame (8), and a plug (10) is fixedly arranged on one end of the movable rod (9) close to the air intake plate (7), and an air intake hole (11) is provided on the air intake plate (7), and a return spring (12) is connected between the fixing frame (8) and the air intake plate (7).

2. The sealing structure of a cylinder piston according to claim 1, characterized in that: The end surface of the plug (10) close to the air inlet plate (7) is in the shape of an inverted cone, and one end of the air inlet hole (11) close to the plug (10) is provided with a groove that fits the inverted cone structure of the plug (10).

3. The sealing structure of a cylinder piston according to claim 1, characterized in that: A fixing groove (13) is provided on the circumferential surface of the piston (1), and a wear-resistant belt (14) is fixedly arranged in the fixing groove (13).

4. The sealing structure of a cylinder piston according to claim 1, characterized in that: A piston rod (15) is fixedly mounted on the piston (1), and an upper end cover (17) and a lower end cover (18) are respectively fixedly mounted on both ends of the cylinder body (2).

5. The sealing structure of a cylinder piston according to claim 1, characterized in that: Buffer sleeves (16) are fixedly arranged on both sides of the piston (1).

6. The sealing structure of a cylinder piston according to claim 4, characterized in that: The four corners of the upper end cover (17) and the lower end cover (18) are fixedly connected via tie rods and tie rod nuts (19).

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