Combined sealing structure

Abstract

The utility model discloses a combined sealing structure which comprises a pressing ring, an upper sealing ring set, a middle sealing ring set, a lower sealing ring set and a supporting ring which are sequentially arranged from top to bottom. 90-degree straight notches are formed in the pressing ring and the supporting ring; the upper sealing ring set, the middle sealing ring set and the lower sealing ring set each comprise at least one V-shaped sealing ring, and 45-degree oblique notches are formed in the V-shaped sealing rings. The notches of the upper and lower adjacent components are arranged in a staggered manner; and the hardness of the V-shaped sealing rings in the middle sealing ring group is lower than that of the V-shaped sealing rings in the other two sealing ring groups. The hardness of the V-shaped sealing rings in the sealing ring set is lower than that of the V-shaped sealing rings in the other two sealing ring sets, the better the sealing performance is, the easier zero leakage is achieved, the V-shaped sealing rings in the upper sealing ring set bear pressure, and the V-shaped sealing rings in the lower sealing ring set prevent the whole sealing ring set from being extruded out. In addition, the 90-degree straight notches are formed in the pressing ring and the supporting ring, and simplicity and convenience are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing elements, in particular to a combined sealing structure. Background Art

[0002] At present, super-long and super-large oil cylinders are widely used in large-scale engineering fields, large-scale equipment manufacturing industries and shipbuilding industries. The main seals of the oil cylinders (piston seals and piston rod seals) are generally V-shaped combined sealing rings, which have the advantages of good pressure resistance, long service life, and strong impact resistance. At present, most of the V-shaped combined seals adopt an integral sealing structure. The multi-piece sealing rings (Vb) are all made of cloth with exactly the same material composition, and the pressure rings (Va) and support rings (Vc) are made of cloth or hard plastic. The integral sealing structure is inconvenient to install and disassemble, and it is easy to leak at low-pressure startup and easy to squeeze out under high-pressure impact. The multi-piece sealing rings Vb have the same function, and there will be a problem that zero leakage cannot be taken into account at both high and low pressures. In view of the above problems, it is urgent to adopt a combined sealing structure with long life, zero leakage and easy disassembly.

[0003] Therefore, it is urgent to propose a new solution to solve the above problems. Summary of the invention

[0004] The utility model provides a combined sealing structure, which can solve the problem that the existing sealing structure cannot achieve zero leakage under high and low pressures at the same time.

[0005] The utility model provides a combined sealing structure, comprising a pressure ring, an upper sealing ring group, a middle sealing ring group, a lower sealing ring group and a support ring which are arranged in sequence from top to bottom;

[0006] The pressure ring and the support ring are both provided with 90° straight cuts;

[0007] The upper sealing ring group, the middle sealing ring group and the lower sealing ring group each include at least one V-shaped sealing ring, and each of the V-shaped sealing rings is provided with a 45° bevel cut;

[0008] The cutouts of two upper and lower adjacent components are staggered with each other;

[0009] The hardness of the V-shaped sealing ring in the middle sealing ring group is lower than the hardness of the V-shaped sealing rings in the other two sealing ring groups.

[0010] Furthermore, the materials of the pressure ring and the V-shaped sealing ring in the middle sealing ring group are pure rubber or low-hardness cotton-cloth rubber;

[0011] The V-shaped sealing rings in the upper sealing ring group and the lower sealing ring group are made of medium-hardness cotton-cloth rubber;

[0012] The support ring is made of aramid cloth-reinforced rubber or nylon.

[0013] Furthermore, the hardness of the pure rubber and low hardness cotton-cloth rubber corresponding to the pressure ring is Shore A85-A90, the hardness of the pure rubber and low hardness cotton-cloth rubber corresponding to the V-shaped sealing ring in the middle sealing ring group is Shore A83-A88, and the hardness of the medium hardness cotton-cloth rubber is Shore D55-D70.

[0014] As a preferred solution, the upper sealing ring assembly comprises a first upper V-shaped sealing ring and a second upper V-shaped sealing ring arranged in sequence from top to bottom, wherein the hardness of the first upper V-shaped sealing ring and the second upper V-shaped sealing ring are Shore D67±2 and Shore D60±2, respectively;

[0015] The middle sealing ring set includes a single middle V-shaped sealing ring, and the hardness of the middle V-shaped sealing ring is Shore A 85±2 degrees;

[0016] The lower sealing ring assembly comprises a first lower V-shaped sealing ring and a second lower V-shaped sealing ring arranged in sequence from top to bottom, wherein the hardness of the first lower V-shaped sealing ring and the second lower V-shaped sealing ring are Shore D 60±2 and Shore D 67±2, respectively;

[0017] The hardness of the pressure ring is Shore A 90±2 degrees, and the hardness of the support ring is Shore D 67±2 degrees.

[0018] As another preferred embodiment, the upper sealing ring assembly includes a single first upper V-shaped sealing ring, and the hardness of the first upper V-shaped sealing ring is Shore D67±2 degrees;

[0019] The middle sealing ring set includes two identical middle V-shaped sealing rings, and the hardness of the middle V-shaped sealing rings is Shore A 85±2 degrees;

[0020] The lower sealing ring assembly includes a single second lower V-shaped sealing ring, and the hardness of the second lower V-shaped sealing ring is Shore D67±2 degrees;

[0021] The hardness of the pressure ring is Shore A 90±2 degrees, and the hardness of the support ring is Shore D 67±2 degrees.

[0022] Furthermore, grooves are provided in the middle of the upper surfaces of the V-shaped sealing ring and the support ring.

[0023] Furthermore, the cotton-cloth-sandwich rubber is polyester-cotton-cloth-sandwich rubber or pure cotton-cloth-sandwich rubber.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] 1. The hardness of the V-shaped sealing ring in the sealing ring group of the utility model is lower than that of the V-shaped sealing ring in the other two sealing ring groups. The better the sealing performance, the easier it is to achieve zero leakage. The V-shaped sealing ring in the upper sealing ring group bears pressure, and the V-shaped sealing ring in the lower sealing ring group prevents the entire sealing ring group from being squeezed out. In addition, a 90° straight cut is provided on the pressure ring and the support ring, which is simple and convenient. A 45° oblique cut is provided on the V-shaped sealing ring, which is conducive to sealing. At the same time, the V-shaped opening can be used to install or disassemble the combined sealing structure without removing the piston or piston rod of the oil cylinder, thereby reducing the difficulty of disassembly.

[0026] 2. The utility model arranges V-shaped sealing rings, pressure rings and support rings of different hardness and materials, and the V-shaped sealing ring in the middle position adopts pure rubber or low-hardness cotton-cloth rubber, which has better elasticity and can ensure the requirement of zero leakage of the sealing ring. The remaining V-shaped sealing rings adopt medium-hardness cotton-cloth rubber, which has higher hardness and good impact pressure resistance. In addition, the incisions of the upper and lower adjacent components are staggered, which can fully ensure good lubrication of the relative friction surfaces, thereby increasing the service life of the sealing ring. In addition, the support ring adopts high-hardness aramid-cloth rubber or nylon, which can effectively prevent the sealing ring from being squeezed out under high pressure and causing sealing failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the combined sealing structure of the first embodiment of the utility model;

[0028] Figure 2 This is a schematic diagram of a combined sealing structure of a second embodiment of the utility model;

[0029] Figure 3 This is a schematic diagram of the structure of the pressure ring of the utility model;

[0030] Figure 4 This is a schematic diagram of the structure of a single V-shaped sealing ring of the utility model;

[0031] Figure 5 This is a schematic diagram of the support ring structure of the utility model;

[0032] Figure numerals: 1. pressure ring; 21. upper sealing ring group; 211. first upper V-shaped sealing ring; 212. second upper V-shaped sealing ring; 22. middle sealing ring group; 221. middle V-shaped sealing ring; 23. lower sealing ring group; 231. first lower V-shaped sealing ring; 232. second lower V-shaped sealing ring; 3. support ring; 41. straight cut; 42. oblique cut; 5. groove. DETAILED DESCRIPTION

[0033] In order to further understand the content, features and functions of the utility model, the following embodiments are given, together with the attached Figures 1 to 5 The detailed instructions are as follows.

[0034] Figure 1 , 3 , 4 and 5 disclose a combined sealing structure of the utility model, as the first embodiment of the utility model, which includes a pressure ring 1, an upper sealing ring group 21, a middle sealing ring group 22, a lower sealing ring group 23, and a support ring 3 arranged in sequence from top to bottom, and the pressure ring 1 and the support ring 3 are provided with a 90° straight cut 41; all the V-shaped sealing rings 2 are provided with a 45° oblique cut 42, which is Figure 4 The angle value of α in the middle; the cutouts of the two adjacent components above and below are staggered, the materials of the V-shaped sealing rings in the above-mentioned pressure ring 1 and the middle sealing ring group 22 are all pure rubber, and low-hardness cotton-cloth rubber can also be used; the materials of the V-shaped sealing rings in the above-mentioned upper sealing ring group 21 and the lower sealing ring group 23 are all medium-hardness cotton-cloth rubber; the material of the above-mentioned support ring 3 is aramid cloth rubber, and nylon can also be used. The utility model sets V-shaped sealing rings, pressure rings and support rings of different hardness and materials, and the V-shaped sealing ring in the middle position adopts pure rubber or low-hardness cotton-cloth rubber, which has better elasticity and can ensure the requirement of zero leakage of the sealing ring. The remaining V-shaped sealing rings adopt cotton-cloth rubber, which has higher hardness and good impact pressure resistance. In addition, the cutouts of the two adjacent components above and below are staggered, which can fully ensure good lubrication of the relative friction surface, thereby improving the service life of the sealing ring. In addition, the support ring adopts high-hardness aramid cloth rubber or nylon, which can effectively prevent the sealing ring from being squeezed out under high pressure and causing sealing failure.

[0035] In the utility model, the hardness of the pure rubber and the low hardness cotton cloth rubber corresponding to the pressure ring 1 is Shore A85-A90, the hardness of the pure rubber and the low hardness cotton cloth rubber corresponding to the V-shaped sealing ring in the middle sealing ring group 22 is Shore A83-A88, the hardness of the pressure ring 1 is slightly higher than the hardness of the V-shaped sealing ring in the middle sealing ring group 22, the hardness of the medium hardness cotton cloth rubber is Shore D55-D70, and the hardness of the medium hardness cotton cloth rubber is Shore D55-D70.

[0036] In the first embodiment, the upper sealing ring group 21 includes a first upper V-shaped sealing ring 211 and a second upper V-shaped sealing ring 212 arranged in sequence from top to bottom, and the hardness of the first upper V-shaped sealing ring 211 and the second upper V-shaped sealing ring 212 are Shore D67±2 and Shore D60±2 respectively; the middle sealing ring group 22 includes a single middle V-shaped sealing ring 221, and the hardness of the middle V-shaped sealing ring 221 is Shore A 85±2; the lower sealing ring group 23 includes a first lower V-shaped sealing ring 231 and a second lower V-shaped sealing ring 232 arranged in sequence from top to bottom, and the hardness of the first lower V-shaped sealing ring 231 and the second lower V-shaped sealing ring 232 are Shore D 60±2 and Shore D67±2 respectively; the hardness of the pressure ring 1 is Shore A90±2, and the hardness of the support ring 3 is Shore D 67±2 degrees, wherein the first upper V-shaped sealing ring 211 and the second upper V-shaped sealing ring 212 are not on the pressure side, the first lower V-shaped sealing ring 231 and the second lower V-shaped sealing ring 232 are on the pressure side, and the hardness of the middle V-shaped sealing ring 221 at the middle position is lower than the hardness of the V-shaped sealing rings at other positions.

[0037] The hardness of the V-shaped sealing ring in the sealing ring group of the utility model is lower than that of the V-shaped sealing rings in the other two sealing ring groups. The better the sealing performance, the easier it is to achieve zero leakage. The V-shaped sealing ring in the upper sealing ring group bears pressure, and the V-shaped sealing ring in the lower sealing ring group prevents the entire sealing ring group from being squeezed out. In addition, a 90° straight cut is provided on the pressure ring and the support ring, which is simple and convenient. A 45° oblique cut is provided on the V-shaped sealing ring, which is conducive to sealing. At the same time, the V-shaped opening can be used to install or disassemble the combined sealing structure when the piston or piston rod of the oil cylinder is not removed, thereby reducing the difficulty of disassembly.

[0038] Figure 2 Another combined sealing structure of the utility model is disclosed. As the second embodiment of the utility model, it includes a pressure ring 1, an upper sealing ring group 21, a middle sealing ring group 22, a lower sealing ring group 23 and a support ring 3 arranged in sequence from top to bottom. The upper sealing ring group 21 includes a single first upper V-shaped sealing ring 211, and the hardness of the first upper V-shaped sealing ring 211 is Shore D67±2 degrees; the middle sealing ring group 22 includes two identical middle V-shaped sealing rings 221, and the hardness of the middle V-shaped sealing rings 221 is Shore A 85±2 degrees; the lower sealing ring group 23 includes a single second lower V-shaped sealing ring 232, and the hardness of the second lower V-shaped sealing ring 232 is Shore D67±2 degrees; the hardness of the pressure ring 1 is Shore A90±2 degrees, and the hardness of the support ring 3 is Shore D 67±2 degrees. The difference between it and the first embodiment is that two identical middle V-shaped sealing rings 221 are used in the middle sealing ring group 22, and the sealing effect is better.

[0039] In this embodiment, a groove 5 is provided in the middle of the upper surface of the V-shaped sealing ring and the support ring 3 to achieve pressure equalization.

[0040] In this embodiment, the low-hardness cotton-cloth-interlayer rubber and the medium-hardness cotton-cloth-interlayer rubber are polyester-cotton-cloth-interlayer rubber, but pure cotton-cloth-interlayer rubber may also be used.

[0041] The above only expresses the implementation methods of the utility model embodiments, and cannot be understood as limiting the scope of the utility model patent, nor is it any form of limitation on the structure of the utility model embodiments. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the utility model embodiments, several changes and improvements can be made, which all belong to the protection scope of the utility model embodiments.

Claims

1. A combined sealing structure, characterized in that: It comprises a pressure ring (1), an upper sealing ring group (21), a middle sealing ring group (22), a lower sealing ring group (23) and a support ring (3) which are arranged in sequence from top to bottom; The pressure ring (1) and the support ring (3) are both provided with a 90° straight cut (41); The upper sealing ring group (21), the middle sealing ring group (22), and the lower sealing ring group (23) each include at least one V-shaped sealing ring, and each of the V-shaped sealing rings is provided with a 45° bevel cut (42); The cutouts of two upper and lower adjacent components are staggered with each other; The hardness of the V-shaped sealing ring in the middle sealing ring group (22) is lower than the hardness of the V-shaped sealing rings in the other two sealing ring groups.

2. A combined sealing structure according to claim 1, characterized in that: The materials of the pressure ring (1) and the V-shaped sealing ring in the middle sealing ring group (22) are pure rubber or low-hardness cotton-cloth rubber; The V-shaped sealing rings in the upper sealing ring group (21) and the lower sealing ring group (23) are both made of medium-hardness cotton-and-cloth rubber; The support ring (3) is made of aramid cloth-reinforced rubber or nylon.

3. A combined sealing structure according to claim 2, characterized in that: The hardness of the pure rubber and the low-hardness cotton-cloth rubber corresponding to the pressure ring (1) is Shore A85-A90, the hardness of the pure rubber and the low-hardness cotton-cloth rubber corresponding to the V-shaped sealing ring in the middle sealing ring group (22) is Shore A83-A88, and the hardness of the medium-hardness cotton-cloth rubber is Shore D55-D70.

4. A combined sealing structure according to claim 3, characterized in that: The upper sealing ring set (21) comprises a first upper V-shaped sealing ring (211) and a second upper V-shaped sealing ring (212) which are arranged in sequence from top to bottom, and the hardness of the first upper V-shaped sealing ring (211) and the second upper V-shaped sealing ring (212) are Shore D 67±2 and Shore D 60±2, respectively; The middle sealing ring set (22) comprises a single middle V-shaped sealing ring (221), and the hardness of the middle V-shaped sealing ring (221) is Shore A 85±2 degrees; The lower sealing ring group (23) comprises a first lower V-shaped sealing ring (231) and a second lower V-shaped sealing ring (232) which are arranged in sequence from top to bottom, and the hardness of the first lower V-shaped sealing ring (231) and the second lower V-shaped sealing ring (232) are Shore D 60±2 and Shore D 67±2, respectively; The hardness of the pressure ring (1) is Shore A 90±2 degrees, and the hardness of the support ring (3) is Shore D 67±2 degrees.

5. A combined sealing structure according to claim 3, characterized in that: The upper sealing ring set (21) comprises a single first upper V-shaped sealing ring (211), and the hardness of the first upper V-shaped sealing ring (211) is Shore D67±2 degrees; The middle sealing ring set (22) comprises two identical middle V-shaped sealing rings (221), and the hardness of the middle V-shaped sealing rings (221) is Shore A 85±2 degrees; The lower sealing ring set (23) comprises a single second lower V-shaped sealing ring (232), and the hardness of the second lower V-shaped sealing ring (232) is Shore D67±2 degrees; The hardness of the pressure ring (1) is Shore A 90±2 degrees, and the hardness of the support ring (3) is Shore D 67±2 degrees.

6. The combined sealing structure according to any one of claims 1 to 5, characterized in that: A groove (5) is provided in the middle of the upper surface of the V-shaped sealing ring and the support ring (3).

7. The combined sealing structure according to any one of claims 2 to 5, characterized in that: The low-hardness cotton-cloth-inserted rubber and the medium-hardness cotton-cloth-inserted rubber are polyester-cotton-cloth-inserted rubber or pure cotton-cloth-inserted rubber.

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