CN-224229280-U - Bidirectional sealing device

CN224229280UCN 224229280 UCN224229280 UCN 224229280UCN-224229280-U

Abstract

The utility model belongs to the technical field of fluid control equipment and discloses a bidirectional sealing device, which comprises an anti-check structure formed by a first copper core subassembly and a second copper core subassembly, wherein the copper core subassembly and the first copper core subassembly form axial guiding fit through a copper core main body of the copper core subassembly, two ends of a first spring are respectively abutted against the copper core main body and the first copper core main body, two ends of a second spring are respectively abutted against the first copper core main body and the second copper core main body, and two ends of a third spring are respectively abutted against the outer wall of the second copper core subassembly and the inner cavity wall of the first copper core subassembly. When the flow is in the forward direction, the first sealing ring is opened to form a main passage, and when the flow is in the reverse direction, the third sealing ring and the second sealing ring are closed in two stages, so that the leakage rate is greatly reduced compared with the traditional single-stage sealing.

Inventors

ZHANG XINGYUAN
Song Die
JIAN ZIWEI
YANG HAIBO
ZHANG GUOHUAI

Assignees

伟鑫(广州)工业科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250521

Claims (7)

1. A bi-directional seal, comprising: The copper valve core assembly (1), wherein the copper valve core assembly (1) comprises a copper valve core main body (11), a first sealing ring (12) arranged on the periphery of the copper valve core main body (11), and a first spring (13) arranged at one end of the copper valve core main body (11); A first copper core assembly (2) comprising a first copper core body (21), a second seal ring (22) provided on the outer periphery of the first copper core body (21), and a second spring (23) mounted on the first copper core body (21); the second copper core assembly (3) comprises a second copper core main body (31), a third sealing ring (32) arranged at the head end of the second copper core and a third spring (33) arranged on the outer wall of the second copper core; The anti-check structure is formed by the first copper core sub-assembly (2) and the second copper core sub-assembly (3), the copper core assembly (1) and the first copper core sub-assembly (21) form axial guiding cooperation through the copper core main body (11) thereof, two ends of the first spring (13) are respectively abutted to the copper core main body (11) and the first copper core sub-assembly (21), two ends of the second spring (23) are respectively abutted to the first copper core sub-assembly (21) and the second copper core sub-assembly (31), and two ends of the third spring (33) are respectively abutted to the outer wall of the second copper core sub-assembly (3) and the inner cavity wall of the first copper core sub-assembly (2).
2. The bidirectional sealing device according to claim 1, wherein the guiding and matching structure of the first copper core body (21) comprises a guiding cylinder, and the guiding cylinder is inserted into a corresponding round hole at one end of the copper core body (11).
3. The bidirectional sealing device according to claim 1, wherein the first sealing ring (12) is disposed at the outer periphery of the end of the copper valve core main body (11), the second sealing ring (22) is disposed at the outer periphery of the middle section of the first copper core main body (21), and the third sealing ring (32) is disposed at the end face of the head of the second copper core.
4. A bi-directional sealing arrangement according to claim 1, characterized in that the first spring (13) is a compression spring, the direction of which pretension is in counter-acting relationship with the direction of flow of the medium.
5. A bi-directional sealing arrangement according to claim 1, characterized in that the spring rate of the second spring (23) is greater than the spring rate of the third spring (33).
6. The bi-directional sealing device according to claim 1, wherein the first sealing ring (12), the second sealing ring (22) and the third sealing ring (32) are made of a high temperature resistant elastic material, and the high temperature resistant elastic material comprises at least one of fluororubber or silicone rubber.
7. The bidirectional sealing device according to claim 1, wherein the outer circumferential surfaces of the copper valve core assembly (1), the first copper core assembly (2) and the second copper core assembly (3) are provided with a plurality of round holes.

Description

Bidirectional sealing device Technical Field The utility model relates to the technical field of fluid control equipment, in particular to a bidirectional sealing device. Background The traditional sealing device faces the following problems under the working conditions of high pressure, bidirectional flow and high temperature tempering prevention: The existing valve is mostly dependent on a unidirectional sealing structure (such as a V-shaped sealing ring or a spiral groove), and cannot effectively cope with a bidirectional pressure alternating working condition. For example, spiral seal structures are only suitable for unidirectional rotation, reverse pressure is prone to seal failure, and the risk of leakage of butterfly valve products under reverse pressure is increased significantly. Conventional anti-backfire devices rely on a single barrier layer that is easily penetrated under high pressure backfire impact. For example, graphite block seals fracture due to insufficient material strength, while stratified combustion body designs can reduce the risk of flashback, but fail to achieve a multi-stage pressure response. Traditional solutions improve tightness by stacking seals or adding air cylinders to compress, but result in increased volume and increased frictional resistance. Disclosure of utility model The utility model mainly aims to provide a bidirectional sealing device, and aims to solve the problem that a conventional tempering prevention device relies on a single barrier layer and is easy to penetrate under high-pressure tempering impact prevention. For example, graphite block seals fracture due to insufficient material strength, while stratified combustion body designs can reduce the risk of reversion, but fail to achieve a multi-stage pressure response. Traditional scheme promotes the leakproofness through overlapping sealing member or increasing cylinder compaction, but leads to the technical problem that the volume increases, frictional resistance risees. In order to achieve the above object, a first aspect of the present utility model provides a bidirectional sealing device, comprising: The copper valve core assembly comprises a copper valve core main body, a first sealing ring arranged at the periphery of the copper valve core main body and a first spring arranged at one end of the copper valve core main body; The first copper core assembly comprises a first copper core main body, a second sealing ring arranged at the periphery of the first copper core main body and a second spring arranged on the first copper core main body; The second copper core assembly comprises a second copper core main body, a third sealing ring arranged at the head end of the second copper core and a third spring arranged on the outer wall of the second copper core; The first copper core subassembly and the second copper core subassembly form and prevent non return structure, copper core subassembly forms axial direction cooperation through its copper core main part and first copper core main part, the both ends of first spring butt copper core main part and first copper core main part respectively, the both ends of second spring butt first copper core main part and second copper core main part respectively, the both ends of third spring butt second copper core subassembly outer wall and first copper core subassembly inner chamber wall respectively. Further, the guiding matching structure of the first copper core main body comprises a guiding cylinder, and the guiding cylinder is inserted into the corresponding round hole at one end of the copper core main body. Further, the first sealing ring is arranged on the outer periphery of the tail end of the copper valve core main body, the second sealing ring is arranged on the outer periphery of the middle section of the first copper core main body, and the third sealing ring is arranged on the end face of the head of the second copper core. Further, the first spring is a compression spring, and the pretightening force direction of the first spring and the medium flowing direction form a reverse action relation. Further, the elastic coefficient of the second spring is larger than that of the third spring. Further, the first sealing ring, the second sealing ring and the third sealing ring are made of high-temperature-resistant elastic materials, and the high-temperature-resistant elastic materials comprise at least one of fluororubber or silicone rubber. Further, a plurality of round holes are formed in the outer peripheral surfaces of the copper valve core assembly, the first copper core assembly and the second copper core assembly. The beneficial effects are that: 1. The utility model adopts a three-stage sealing structure (a copper valve core assembly and a first/second copper core assembly) and realizes pressure gradient response through springs with different elastic coefficients. When the flow is in the forward direction, the first sealing ring is opened to form a m