A PTFE seal structure for a hydraulic breaker

Abstract

This utility model discloses a PTFE sealing structure for a hydraulic breaker, including a cylinder body with a hammer head, and a sealing ring disposed on the outside of the hammer head. A first lip and a second lip with the same inclination angle are fixedly installed in the sealing ring, and a tail lip is symmetrically arranged on the second lip. A storage cavity is formed in the sealing ring. The PTFE sealing structure for a hydraulic breaker provided by this utility model forms a double barrier against external dust through the first and second lips. Adhering dust entering the inner ring of the sealing ring is intercepted by the second lip, effectively reducing the problem of dust continuing to penetrate and aggravating wear. When oil carrying dust continues to seep from the second lip to the tail lip, the accumulated oil seeps into the storage cavity from the one-way flap, allowing the storage cavity to absorb and store this portion of oil mixed with dust. This also reduces the risk of oil leakage and minimizes the situation where dust remains in the oil on the hammer head surface, thus reducing wear.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and more specifically to a PTFE sealing structure for a hydraulic breaker. Background Technology

[0002] A hydraulic breaker is a device that converts hydraulic pressure into mechanical impact energy. It uses a valve body and cylinder piston for hydraulic control to achieve high-frequency repetitive piston movement to drive the hammer head to break the metal. A PTFE seal is required between the hammer head and the cylinder to prevent lubricating oil leakage.

[0003] According to the publication (announcement) number: CN113847432A, the publication (announcement) date: 2021-12-28, a buffer seal for a hydraulic breaker is disclosed.

[0004] In the prior art, including the aforementioned patent, the lip of the PTFE seal is repeatedly rubbed by the hammer head. Therefore, the area on the side wall of the hammer head where the lubricant is applied will inevitably be exposed outside the PTFE seal. The working environment of the hammer head is prone to generating dust and debris. After this dust is attached to the lubricant on the side wall of the hammer head, it is easy to enter the inside of the PTFE seal as the hammer head moves. Although multiple layers of protective rings are set inside the cylinder to prevent the infiltration of contaminants, the dust particles attached to the side wall of the hammer head will aggravate the wear of the PTFE seal lip, greatly shorten the service life of the PTFE seal, and cause lubricant leakage. Utility Model Content

[0005] The purpose of this invention is to provide a PTFE sealing structure for hydraulic breakers, aiming to solve the problems mentioned above.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A PTFE sealing structure for a hydraulic breaker includes a cylinder body with a hammer head and a sealing ring disposed on the outside of the hammer head. The sealing ring has a first lip and a second lip with the same inclination angle fixedly installed in it, and the second lip has a tail lip symmetrically arranged thereon.

[0008] The sealing ring has a storage cavity, and a one-way membrane flap communicating with the storage cavity is arranged circumferentially between the second lip and the tail lip.

[0009] Preferably, a spacer ring is fixedly installed in the reservoir, and the end of the spacer ring cooperates with a one-way membrane flap.

[0010] Preferably, the spacer divides the storage cavity to form an outer cavity segment and an inner cavity segment, and the outer cavity segment is deformed under pressure.

[0011] Preferably, the sealing ring is further provided with an inner lip that communicates with the inner cavity section.

[0012] Preferably, the inner lip, under deformation, fills the gap between the first lip and the second lip.

[0013] In the above technical solution, the PTFE sealing structure for hydraulic breakers provided by this utility model has the following beneficial effects: the first lip and the second lip form a double barrier against external dust, and the dust adhering to the inner ring of the sealing ring is intercepted by the second lip, effectively reducing the problem of dust continuing to seep in and aggravating wear. When the oil carrying dust continues to seep in from the second lip to the tail lip, the accumulated oil seeps into the storage cavity from the one-way diaphragm valve, so that the storage cavity absorbs and stores this part of the oil mixed with dust, while not easily causing oil leakage, reducing the situation where dust stays in the oil on the surface of the hammer and aggravates wear. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0015] Figure 1 This is a schematic diagram of the cylinder body and its internal hammer head assembly provided in an embodiment of the present utility model;

[0016] Figure 2 This is a schematic cross-sectional view of the cylinder body and its inner hammer head provided in an embodiment of the present utility model;

[0017] Figure 3 for Figure 2 Enlarged view of point A;

[0018] Figure 4 This is a side cross-sectional view of the sealing ring provided in an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Cylinder body; 11. Hammer head; 2. Sealing ring; 21. First lip; 22. Second lip; 23. Tail lip; 24. One-way diaphragm flap; 25. Storage cavity; 251. Spacer ring; 252. Outer cavity section; 253. Inner cavity section; 26. Inner lip. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0022] like Figure 1-4As shown, a PTFE sealing structure for a hydraulic breaker includes a cylinder 1 with a hammer head 11, and a sealing ring 2 disposed on the outside of the hammer head 11. A first lip 21 and a second lip 22 with the same inclination angle are fixedly installed in the sealing ring 2, and a tail lip 23 is symmetrically arranged on the second lip 22.

[0023] A storage cavity 25 is provided in the sealing ring 2, and a one-way membrane flap 24 communicating with the storage cavity 25 is arranged circumferentially between the second lip 22 and the tail lip 23.

[0024] Specifically, the hammer 11 that moves in the cylinder 1 is existing technology and will not be described in detail here. The inner wall of the cylinder 1 is provided with an annular notch for fixing the sealing ring 2 so that the sealing ring 2 can maintain stable operation.

[0025] Furthermore, both the first lip 21 and the second lip 22 face the clamping end of the hammer head 11, i.e., the position where floating dust seeps in, while the tail lip 23 faces the inside of the cylinder 1, so that the tail lip 23 forms the final blocking function, effectively reducing the seepage of attached dust.

[0026] Furthermore, the cylinder body 1 is equipped with a component to compensate for the missing oil in the hammer head 11. The compensation method and components are existing technologies and will not be described in detail here. The one-way diaphragm flap 24 makes it difficult for the oil to leak after it enters. Specifically, it is a diaphragm flap made of rubber.

[0027] The first lip 21 and the second lip 22 form a double barrier against external dust, and the dust adhering to the inner ring of the sealing ring 2 is intercepted by the second lip 22, effectively reducing the problem of dust continuing to seep in and aggravating wear. When the oil carrying dust continues to seep into the tail lip 23 from the second lip 22, the accumulated oil seeps into the storage cavity 25 from the one-way flap 24, so that the storage cavity 25 absorbs and stores this part of the oil mixed with dust, while not easily causing oil leakage, reducing the situation where dust stays in the oil on the surface of the hammer head 11 and aggravates wear. The cylinder body 1 then replenishes the missing oil on the surface of the hammer head 11 to ensure the lubrication effect of the hammer head 11 during operation. At the same time, during the maintenance or repair of the cylinder body 1, the sealing ring 2 that is stored with dust and oil and is severely worn can be removed and replaced to ensure the sealing effect of the hammer head 11 during operation.

[0028] As a further embodiment of this utility model, a spacer ring 251 is fixedly installed in the reservoir 25, and the end of the spacer ring 251 cooperates with the one-way diaphragm flap 24.

[0029] Specifically, the spacer ring 251 is a rubber ring located in the protruding part of the storage cavity 25.

[0030] The spacer ring 251 provides pressure resistance in the storage cavity 25, reducing the squeezing force generated by the oil being pushed by the hammer head 11, and preventing the sealing ring 2 from losing its sealing effect. At the same time, when the storage cavity 25 is full of oil, the spacer ring 251 with the barrier effect can increase the resistance to oil leakage, so that the one-way diaphragm flap 24 maintains a good sealing effect, making it difficult for oil to leak to the side wall of the hammer head 11, thus ensuring the working safety of the hammer head 11.

[0031] As another embodiment further provided by this utility model, the spacer ring 251 divides the storage cavity 25 to form an outer cavity segment 252 and an inner cavity segment 253, and the outer cavity segment 252 is deformed under pressure.

[0032] Specifically, the outer cavity section 252 and the inner cavity section 253 are arranged in a "C" shape with their left and right positions reversed, in order to increase the oil carrying capacity of the storage cavity 25.

[0033] The oil in the storage cavity 25 settles naturally and accumulates at the connection between the spacer ring 251 and the inner wall of the storage cavity 25, effectively reducing the leakage of dust particles from the end of the spacer ring 251 to the one-way diaphragm flap 24. This reduces the wear caused by dust particles on the one-way diaphragm flap 24, extends the service life of the one-way diaphragm flap 24, and improves the one-way diaphragm flap 24's ability to prevent oil leakage from the sealing ring 2.

[0034] As another embodiment further provided by this utility model, the sealing ring 2 is also provided with an inner lip opening 26 communicating with the inner cavity section 253.

[0035] The sealing ring 2's ability to hold oil is improved by connecting the inner lip 26 to the storage cavity 25. This means that the storage cavity 25's capacity to hold oil is increased corresponding to the inner lip 26, resulting in a longer service life for the sealing ring 2, a shorter replacement cycle for the PTFE seal, and reduced usage costs.

[0036] As another embodiment provided by this utility model, the deformed inner lip 26 fills the gap between the first lip 21 and the second lip 22.

[0037] Specifically, the inner lip opening 26 has the same inclination angle as the first lip opening 21.

[0038] During the process of diverting oil stains inside the storage cavity 25 through the inner lip 26, the rubber inner lip 26 is stretched and deformed along the gap between the first lip 21 and the second lip 22 until the inner lip 26 is flush with the ends of the first lip 21 and the second lip 22. On the one hand, the inner lip 26, together with the first lip 21 and the second lip 22, forms a triple barrier to improve the blocking effect on dust particles. On the other hand, the gradually expanding inner lip 26 will gradually compress the included angle between the first lip 21 and the second lip 22, so that the area of ​​contact with the side wall of the hammer head 11 gradually increases, the area of ​​lubricating oil protection increases, and the working efficiency of the hammer head 11 is improved. At the same time, the penetration distance of dust particles increases, further increasing the difficulty of dust particles penetrating and extending the service life of the PTFE seal.

[0039] Working principle: The first lip 21 and the second lip 22 form a double barrier against external dust, and the dust adhering to the inner ring of the sealing ring 2 is intercepted by the second lip 22, effectively reducing the further penetration of dust and aggravating wear. When the oil carrying dust continues to seep into the tail lip 23 from the second lip 22, the accumulated oil seeps into the storage cavity 25 from the one-way flap 24, so that the storage cavity 25 absorbs and stores this part of the oil mixed with dust, while not causing oil leakage, reducing the situation where dust stays in the oil on the surface of the hammer head 11 and aggravates wear. The cylinder body 1 then replenishes the missing oil on the surface of the hammer head 11 to ensure the lubrication effect of the hammer head 11. At the same time, during the maintenance or repair of the cylinder body 1, the sealing ring 2 that is stored with dust and oil and is severely worn can be removed and replaced to ensure the sealing effect of the hammer head 11 during operation.

[0040] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A PTFE seal structure for a hydraulic breaking hammer, comprising a cylinder (1) provided with a hammer head (11), characterized in that, It also includes a sealing ring (2) disposed on the outside of the hammer head (11), wherein a first lip (21) and a second lip (22) with the same inclination angle are fixedly installed in the sealing ring (2), and a tail lip (23) is symmetrically arranged in the second lip (22). The sealing ring (2) has a storage cavity (25), and a one-way membrane flap (24) connected to the storage cavity (25) is arranged circumferentially between the second lip (22) and the tail lip (23).

2. The PTFE seal structure for a hydraulic breaking hammer according to claim 1, wherein A spacer ring (251) is fixedly installed in the storage cavity (25), and the end of the spacer ring (251) is engaged with the one-way flap (24).

3. The PTFE seal structure for a hydraulic breaking hammer according to claim 2, characterized by The partition ring (251) divides the storage cavity (25) to form an outer cavity segment (252) and an inner cavity segment (253), the outer cavity segment (252) being deformed under pressure.

4. The PTFE seal structure for a hydraulic breaking hammer according to claim 3, characterized by The sealing ring (2) is also provided with an inner lip (26) that communicates with the inner cavity section (253).

5. The PTFE seal structure for a hydraulic breaking hammer according to claim 4, wherein The inner lip opening (26) under deformation fills the gap between the first lip opening (21) and the second lip opening (22).

Images