CN215171197U

CN215171197U - Oil cylinder with multi-stage sealing structure and interstage pressure relief structure

Info

Publication number: CN215171197U
Application number: CN202120997089.9U
Authority: CN
Inventors: 粟武洪; 罗武
Original assignee: Shaoyang Victor Hydraulics Co ltd
Current assignee: Shaoyang Victor Hydraulics Co ltd
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2021-12-14
Anticipated expiration: 2031-05-11

Abstract

The utility model discloses an hydro-cylinder with multistage seal structure and interstage pressure release structure, including cylinder and piston rod, the piston rod includes jar pole and piston head, the piston head is located in the cylinder, the one end of jar pole with the piston head links to each other, stretch out the other end of jar pole outside the cylinder, wherein, the piston head with be equipped with a plurality of sunken seal grooves that form on the outer wall of cylinder contact, n is for being more than or equal to 2 natural number, n the seal groove is followed the length direction interval of piston rod sets up, every be equipped with a sealing washer in the seal groove is all, be equipped with on the piston rod and form the pressure release passageway in it, the pressure release passageway includes oil inlet and oil drain port, the oil inlet is located adjacent two between the seal groove, just the oil inlet stretches out the piston head with the outer wall of cylinder contact. The utility model discloses a aim at solving the not good technical problem of hydro-cylinder sealing performance among the correlation technique.

Description

Oil cylinder with multi-stage sealing structure and interstage pressure relief structure

Technical Field

The utility model belongs to the technical field of the hydro-cylinder, especially, relate to a hydro-cylinder with multistage seal structure and interstage pressure release structure.

Background

In the use of hydro-cylinder, the piston is reciprocating sliding in the cylinder, in order to guarantee the sliding seal performance of piston outer wall and cylinder inner wall, among the correlation technique, establish the sealing washer at piston outer wall cover. In order to enhance the sealing effect, a multi-stage sealing ring is sleeved outside the piston.

The related art is not enough in that when setting up multistage sealing washer, the pneumatic cylinder is after long-term the use, because the repeated action of high-pressure fluid, partial fluid can extrude between the adjacent sealing washer, causes stage filling high-pressure hydraulic oil, and stage filling high-pressure hydraulic oil can cause the clearance between piston and the cylinder, and stage filling high-pressure hydraulic oil can force the sealing washer to take place deformation simultaneously. The sealing performance between the piston and the cylinder barrel is seriously affected.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Based on this, the utility model provides an hydro-cylinder with multistage seal structure and interstage pressure relief structure, this hydro-cylinder with multistage seal structure and interstage pressure relief structure aim at solving the not good technical problem of hydro-cylinder sealing performance among the correlation technique.

(II) technical scheme

In order to solve the technical problem, the utility model provides an oil cylinder with a multi-stage sealing structure and an interstage pressure relief structure, which comprises a cylinder barrel and a piston rod, wherein the piston rod comprises a cylinder rod and a piston head, the piston head is arranged in the cylinder barrel, one end of the cylinder rod is connected with the piston head, and the other end of the cylinder rod extends out of the cylinder barrel, and the oil cylinder is characterized in that n recessed sealing grooves are arranged on the outer wall of the piston head, which is in contact with the cylinder barrel, n is a natural number which is not less than 2, n sealing grooves are arranged at intervals along the length direction of the piston rod, a sealing ring is arranged in each sealing groove, a pressure relief channel formed in the piston rod is arranged on the piston rod, the pressure relief channel comprises an oil inlet and an oil outlet, the oil inlet is arranged between two adjacent sealing grooves, and the oil inlet extends out of the outer wall of the piston head, which is in contact with the cylinder barrel, the oil drain port extends out of a side of the cylinder rod away from the piston head.

Preferably, the pressure relief channel includes axial hole and radial hole, the axial hole is followed the length direction of cylinder rod sets up, the axial hole is kept away from the one end in radial hole is the oil drain, the radial hole be close to the one end in axial hole with radial hole intercommunication, the radial hole is kept away from the one end in axial hole is the oil inlet.

Preferably, the axial hole and the radial hole are both round holes.

Preferably, the diameter of the radial bore is smaller than the diameter of the axial bore.

Preferably, the radial hole is arranged perpendicular to the axial hole.

Preferably, the number of the sealing grooves is 2.

Preferably, the piston head comprises a piston main body and a rubber lantern ring annularly arranged outside the piston main body, and the sealing groove penetrates through the rubber lantern ring and extends into the piston main body.

Preferably, the piston body and the cylinder rod are made of a metal material.

Preferably, the cylinder rod is integrally formed with the piston main body.

Preferably, the cross section of the sealing groove is rectangular.

(III) advantageous effects

The utility model discloses compare with prior art, the utility model discloses the beneficial effect of hydro-cylinder with multistage seal structure and interstage pressure release structure mainly includes:

the utility model discloses in, through setting up n seal groove to set up the sealing washer in per pass seal groove, form multistage seal structure, do benefit to the sealing performance who improves between piston head and the cylinder inner wall. The pressure relief channel is arranged to serve as an interstage pressure relief structure and used for leading out high-pressure oil entering between adjacent sealing rings and discharging the high-pressure oil to the atmosphere along the cylinder rod, so that pressure relief is achieved, hydraulic oil is prevented from being stored between the adjacent sealing rings, and the problem that interstage pressure is caused when the hydraulic oil flows into the adjacent sealing rings in a multi-stage sealing structure can be effectively solved. The long-term stable sealing of the multistage sealing structure is ensured.

Drawings

The features and advantages of the invention will be more clearly understood by reference to the accompanying drawings, which are schematic and should not be understood as imposing any limitation on the invention, in which:

fig. 1 is the overall structure schematic diagram of the oil cylinder with the multi-stage sealing structure and the interstage pressure relief structure according to the embodiment of the present invention.

Description of reference numerals:

1. the oil cylinder comprises a cylinder barrel, 2, a piston rod, 21, a cylinder rod, 22, a piston head, 23, a pressure relief channel, 221, a sealing groove, 222, a piston main body, 223, a rubber collar, 231, a radial hole, 232, an axial hole, 2311, an oil inlet and 2321, and an oil outlet.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be embodied in many different forms other than those specifically described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention, and it is therefore not to be limited to the specific embodiments disclosed below.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the two elements may be mechanically or electrically connected, directly or indirectly connected through an intermediate medium, or connected through the inside of the two elements, or "in transmission connection", that is, connected in a power manner through various suitable manners such as belt transmission, gear transmission, or sprocket transmission. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, an oil cylinder with a multi-stage sealing structure and an interstage pressure relief structure comprises a cylinder barrel 1 and a piston rod 2, wherein the piston rod 2 comprises a cylinder rod 21 and a piston head 22, the piston head 22 is arranged in the cylinder barrel 1, one end of the cylinder rod 21 is connected with the piston head 22, the other end of the cylinder rod 21 extends out of the cylinder barrel 1, wherein, n recessed sealing grooves 221 are arranged on the outer wall of the piston head 22 contacting the cylinder barrel 1, n is a natural number larger than or equal to 2, the n sealing grooves 221 are arranged at intervals along the length direction of the piston rod 2, a sealing ring is arranged in each sealing groove 221, a pressure relief channel 23 formed in the piston rod 2 is arranged on the piston rod 2, the pressure relief channel 23 comprises an oil inlet 2311 and an oil outlet 2321, the oil inlet 2311 is arranged between two adjacent sealing grooves 221, and the oil inlet 2311 extends out of the outer wall of the piston head 22 contacted with the cylinder barrel 1, and the oil outlet 2321 extends out of one side of the cylinder rod 21 far away from the piston head 22.

In this embodiment, n sealing grooves 221 are provided, and a sealing ring is provided in each sealing groove 221, so that a multi-stage sealing structure is formed, which is beneficial to improving the sealing performance between the piston head 22 and the inner wall of the cylinder barrel 1.

The pressure relief channel 23 is an interstage pressure relief structure, and is used for leading out high-pressure oil (high-pressure hydraulic oil which is full between stages) entering between adjacent sealing rings and discharging the high-pressure oil into the atmosphere along the cylinder rod 21, so that pressure relief is realized, hydraulic oil is prevented from being stored between the adjacent sealing rings, and the problem of interstage pressure caused by the fact that the hydraulic oil flows into the adjacent sealing rings in the multistage sealing structure can be effectively solved. The long-term stable sealing of the multistage sealing structure is ensured.

It should be noted that, in general, after the hydraulic cylinder operates for several days, the oil outlet 2321 at the end of the cylinder rod 21 discharges a plurality of drops of hydraulic oil, and the amount of the high-pressure hydraulic oil which is filled between stages is small, so that the hydraulic oil can be directly led out of the cylinder rod 21 without affecting the normal use of the cylinder.

According to the utility model discloses a specific embodiment, pressure release channel 23 includes axial hole 232 and radial hole 231, and axial hole 232 sets up along the length direction of jar pole 21, and the one end that radial hole 231 was kept away from to axial hole 232 is oil drain 2321, and radial hole 231 is close to the one end and the radial hole 231 intercommunication of axial hole 232, and the one end that axial hole 232 was kept away from to radial hole 231 is oil inlet 2311. In this embodiment, the pressure relief channel 23 is formed by communicating the axial hole 232 and the radial hole 231, and the structure is favorable for reducing the molding difficulty of the pressure relief channel 23 and is easy to mold.

According to the utility model discloses a specific embodiment, axial hole 232 and radial hole 231 are the round hole. In this embodiment, the structure of round hole does benefit to the shaping, and the inner wall of round hole is the smooth surface simultaneously, does benefit to fluid discharge, avoids gathering.

According to a specific embodiment of the present invention, the diameter of the radial hole 231 is smaller than the diameter of the axial hole 232. Because the axial hole 232 is a slender hole, the processing is difficult, the diameter of the axial hole is properly increased, the forming is facilitated, and meanwhile, the oil liquid discharge is facilitated.

According to the utility model discloses a specific embodiment, radial hole 231 sets up with axial hole 232 is perpendicular. The radial hole 231 is a vertical hole, and when the relief passage 23 is formed, an axial hole 232 is drilled in the horizontal direction of the cylinder rod 21, and a radial hole 231 communicating with the axial hole 232 is drilled in the radial direction of the piston head 22. The axial hole 232 is a horizontal hole, and a horizontal hole and a vertical hole are adopted, so that the positioning during drilling is easier, namely, the structure is adopted to facilitate molding.

According to the embodiment of the present invention, the number of the sealing grooves 221 is 2. In this embodiment, two-stage sealing is employed, and a pressure relief passage 23 is provided between the two-stage sealing. By adopting the structure, the structure can be simplified as much as possible while effective sealing is ensured.

According to the embodiment of the present invention, the piston head 22 includes a piston main body 222 and a rubber collar 223 surrounding the piston main body 222, and the sealing groove 221 extends through the rubber collar 223 and into the piston main body 222. In this embodiment, the rubber collar 223 is used to prevent the piston main body 222 from directly and rigidly contacting the cylinder barrel 1, so as to improve the overall service life of the oil cylinder and improve the sealing performance.

According to an embodiment of the present invention, the piston main body 222 and the cylinder rod 21 are made of a metal material. The cylinder rod 21 is integrally formed with the piston main body 222. This structure contributes to improving the overall mechanical properties of the piston rod 2.

According to the present invention, the cross section of the sealing groove 221 is rectangular. This structure facilitates molding.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. An oil cylinder with a multi-stage sealing structure and an interstage pressure relief structure comprises a cylinder barrel and a piston rod, the piston rod comprises a cylinder rod and a piston head, the piston head is arranged in the cylinder barrel, one end of the cylinder rod is connected with the piston head, the other end of the cylinder rod extends out of the cylinder barrel, it is characterized in that n recessed sealing grooves are arranged on the outer wall of the piston head, which is in contact with the cylinder barrel, n is a natural number which is more than or equal to 2, the n sealing grooves are arranged at intervals along the length direction of the piston rod, a sealing ring is arranged in each sealing groove, the piston rod is provided with a pressure relief channel formed in the piston rod, the pressure relief channel comprises an oil inlet and an oil outlet, the oil inlet is positioned between two adjacent sealing grooves, and the oil inlet extends out of the outer wall of the piston head contacted with the cylinder barrel, and the oil outlet extends out of one side of the cylinder rod far away from the piston head.

2. The cylinder with a multi-stage sealing structure and an inter-stage pressure relief structure according to claim 1, wherein the pressure relief passage includes an axial hole and a radial hole, the axial hole is disposed along the length direction of the cylinder rod, an end of the axial hole away from the radial hole is the oil discharge port, an end of the radial hole close to the axial hole is communicated with the radial hole, and an end of the radial hole away from the axial hole is the oil inlet.

3. The cylinder with the multi-stage sealing structure and the inter-stage pressure relief structure according to claim 2, wherein the axial hole and the radial hole are circular holes.

4. The cylinder having a multi-stage seal structure and an inter-stage pressure relief structure according to claim 3, wherein a diameter of said radial hole is smaller than a diameter of said axial hole.

5. The cylinder having a multi-stage seal structure and an inter-stage pressure relief structure according to claim 4, wherein said radial hole is disposed perpendicular to said axial hole.

6. The oil cylinder with the multi-stage sealing structure and the inter-stage pressure relief structure according to any one of claims 1 to 5, wherein the number of the sealing grooves is 2.

7. The oil cylinder with the multi-stage sealing structure and the inter-stage pressure relief structure as claimed in claim 6, wherein the piston head comprises a piston main body and a rubber collar arranged around the outside of the piston main body, and the sealing groove penetrates through the rubber collar and extends into the piston main body.

8. The cylinder having a multi-stage sealing structure and an inter-stage pressure relief structure according to claim 7, wherein the piston main body and the cylinder rod are made of a metal material.

9. The cylinder having a multi-stage seal structure and an inter-stage pressure relief structure according to claim 8, wherein said cylinder rod is integrally formed with said piston main body.

10. The cylinder with the multi-stage sealing structure and the inter-stage pressure relief structure according to claim 9, wherein the cross section of the sealing groove is rectangular.