Plunger type cylinder sealing structure

Abstract

The utility model relates to a plunger type cylinder sealing structure which comprises a sealing piece body, a sealing piece, a sealing piece, a sealing piece and a sealing piece, and the sealing piece body is matched with a mounting groove in the side wall of a plunger type cylinder body; a containing groove is formed in the side, close to the bottom of the plunger type cylinder, of the sealing piece body, the O-shaped ring is matched with the containing groove in a clamped connection mode, and the hardness of the O-shaped ring is smaller than that of the sealing piece body. The O-shaped ring made of soft materials can overcome the defects of the sealing piece body with high hardness, the contact stress of the lip portion of the sealing structure is increased, the hydraulic leakage risk is successfully improved, the good dustproof effect is achieved, and the purposes of improving oil leakage of a hydraulic cylinder and improving the sealing effect of the sealing piece are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of sealing structures, and in particular to a plunger cylinder sealing structure. Background Art

[0002] The plunger cylinder is a structural form of hydraulic cylinder.

[0003] In the related art, for example, a Chinese patent with the patent publication number CN203248441U proposes a hydraulic cylinder for an excavator quick connector, including a cylinder sleeve, a piston rod and a piston are arranged in the cylinder sleeve, one end of the piston rod is connected to the piston, and the other end is provided with a connecting shaft, the piston rod is installed together with a connecting rod cover through a sliding bearing, and the connecting rod cover is connected to the cylinder sleeve. A seal and a U-shaped sealing gasket are provided at the joint of the piston rod and the connecting rod cover.

[0004] One end of the piston is connected to the piston rod, and an O-ring is provided at the joint of the piston and the piston rod. The other end is connected to the cylinder sleeve through a hexagonal nut, and a sealing ring is provided at the joint of the piston and the cylinder sleeve, and a pressure reducing valve is provided on the piston. An assembly shaft is provided at one end of the cylinder sleeve, and a grease nipple is provided on the assembly shaft; a connecting pipeline is provided on the outside of the cylinder sleeve, and a spring pin is provided on the connecting pipeline.

[0005] With respect to the above-mentioned related technologies, the inventors found that the sealing effect of the sealing element is poor and hydraulic oil leakage is likely to occur. Utility Model Content

[0006] In order to improve the oil leakage problem of the hydraulic cylinder and to enhance the sealing effect of the seal, the present application provides a plunger cylinder sealing structure.

[0007] The present application provides a plunger cylinder sealing structure, which adopts the following technical solution:

[0008] A plunger cylinder sealing structure, comprising:

[0009] The sealing body is arranged in cooperation with the mounting groove on the side wall of the plunger cylinder body;

[0010] An O-ring is provided with a receiving groove on one side of the sealing body close to the bottom of the plunger cylinder, the O-ring is engaged with the receiving groove, and the hardness of the O-ring is less than the hardness of the sealing body.

[0011] Furthermore, the cross section of the O-ring is set to be circular.

[0012] Furthermore, bosses are provided on both sides of the root of the sealing body.

[0013] Furthermore, the bottom of the accommodating groove is configured as a curved surface.

[0014] Furthermore, a connecting portion is fixedly connected to the side of the sealing body away from the bottom of the plunger cylinder, and one end of the connecting portion away from the sealing body extends beyond the side of the mounting groove away from the bottom of the plunger cylinder, and the side of the connecting portion away from the bottom of the mounting groove extends to the moving trajectory of the piston rod.

[0015] Furthermore, the connection position between the connection portion and the sealing body is staggered with the angle of the slot of the accommodating groove.

[0016] To sum up, the beneficial technical effects of the present application are as follows: the O-ring made of a softer material can make up for the shortcomings of the sealing body with a higher hardness, increase the contact stress of the lip of the sealing structure, successfully improve the risk of hydraulic leakage, and achieve a good dustproof effect, thereby achieving the purpose of improving the problem of oil leakage in the hydraulic cylinder and improving the sealing effect of the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0018] Reference numerals: 100, sealing body; 110, receiving groove; 120, boss; 200, O-ring; 300, connecting portion; 500, mounting groove. DETAILED DESCRIPTION

[0019] 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, rather than 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.

[0020] The present application embodiment discloses a plunger cylinder sealing structure. Figure 1 The plunger cylinder sealing structure includes a sealing body 100 and an O-ring.

[0021] The seal body 100 is arranged in cooperation with the mounting groove 500 on the side wall of the plunger cylinder. A receiving groove 110 is provided on one side of the seal body 100 close to the bottom of the plunger cylinder, and the O-ring is engaged with the receiving groove 110, and the hardness of the O-ring 200 is less than the hardness of the seal body 100. In this embodiment, the O-ring 200 is made of nitrile rubber with a hardness of SHA70, and the main sealing material is made of polyurethane with a hardness of SHA95. At the same time, the O-ring can improve the elasticity of high-hardness polyurethane and increase the contact stress of the sealing lip of the sealing structure, thereby improving the risk of hydraulic leakage and achieving a good dustproof effect.

[0022] Along the axial direction of the piston rod of the plunger cylinder, the depth of the accommodating groove 110 is greater than that of the O-ring 200 , so that the accommodating groove 110 can provide sufficient deformation space for the O-ring 200 .

[0023] In order to reduce stress concentration at the bottom of the receiving groove 110 , the bottom of the receiving groove 110 is set to an arc surface, and the cross section of the O-ring 200 is set to a circle, so that the force on the O-ring 200 can be dispersed to various positions of the O-ring 200 .

[0024] In order to improve the dust-proof effect of the sealing structure, a connecting part 300 is fixedly connected to the side of the sealing body 100 away from the bottom of the plunger cylinder, and one end of the connecting part 300 away from the sealing body 100 extends beyond the side of the mounting groove 500 away from the bottom of the plunger cylinder, and the side of the connecting part 300 away from the bottom of the mounting groove 500 extends to the moving trajectory of the piston rod, thereby improving the clamping force of the sealing structure on the piston rod.

[0025] In order to prevent the connection position between the connection part 300 and the seal body 100 from being broken, the connection position between the connection part 300 and the seal body 100 is staggered with the angle between the side of the accommodating groove 110 away from the bottom of the plunger cylinder.

[0026] In order to further improve the sealing effect of the sealing structure, bosses 120 are fixedly connected to both sides of the root of the sealing body 100. The cross-section of the boss 120 is triangular. One side of the boss 120 is fixedly connected to the root of the sealing body 100, and the angle between the boss 120 and the sealing body 100 is an obtuse angle.

[0027] The implementation principle of a plunger cylinder sealing structure in an embodiment of the present application is as follows: after the sealing structure is matched with the mounting groove on the side wall of the plunger cylinder body, the various components of the plunger cylinder are assembled, and the plunger cylinder is started, so that the sealing structure seals the movement process of the plunger rod.

[0028] 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 plunger cylinder sealing structure, characterized in that: include: The sealing element body (100) is arranged in cooperation with the mounting groove (500) on the side wall of the plunger cylinder body; An O-ring (200) is provided with a receiving groove (110) on one side of the sealing body (100) close to the bottom of the plunger cylinder, the O-ring (200) is snap-fitted with the receiving groove (110), and the hardness of the O-ring (200) is less than the hardness of the sealing body (100).

2. A plunger cylinder sealing structure according to claim 1, characterized in that: The cross section of the O-ring is arranged to be circular.

3. A plunger cylinder sealing structure according to claim 1, characterized in that: Bosses (120) are provided on both sides of the root of the sealing body (100).

4. A plunger cylinder sealing structure according to claim 1, characterized in that: The bottom of the accommodating groove (110) is configured as a curved surface.

5. The plunger cylinder sealing structure according to claim 1, characterized in that: A connecting portion (300) is fixedly connected to a side of the sealing body (100) facing away from the bottom of the plunger cylinder, and an end of the connecting portion (300) away from the sealing body (100) extends beyond a side of the mounting groove (500) facing away from the bottom of the plunger cylinder, and a side of the connecting portion (300) away from the bottom of the mounting groove (500) extends to the moving track of the piston rod.

6. A plunger cylinder sealing structure according to claim 5, characterized in that: The connection position between the connection portion (300) and the sealing element body (100) is staggered with the notch angle of the accommodating groove (110).

Images