Bidirectional sealing device
By using a three-stage sealing structure and a high-temperature resistant composite material sealing ring, the problem of sealing failure and volume increase of traditional sealing devices under high pressure, bidirectional flow and high temperature conditions is solved, achieving high efficiency sealing and resistance to thermal deformation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WEIXIN (GUANGZHOU) IND TECH CO LTD
- Filing Date
- 2025-05-21
- Publication Date
- 2026-05-12
AI Technical Summary
Traditional sealing devices suffer from sealing failure, increased volume, and increased frictional resistance under high pressure, bidirectional flow, and high-temperature flashback conditions. In particular, unidirectional sealing structures are prone to failure under reverse pressure, and single barrier layers are easily penetrated under high-pressure flashback impact. Layered combustors cannot achieve multi-stage pressure response.
It adopts a three-stage sealing structure, including a copper valve core assembly and first and second copper core sub-assemblies. The pressure gradient response is achieved through springs with different elastic coefficients. Combined with high-temperature resistant composite material sealing rings, it is designed so that the main passage opens when the flow is positive and closes in stages when the flow is reversed, which enhances the resistance to thermal deformation.
It effectively reduced the leakage rate, improved sealing performance and resistance to thermal deformation, and achieved stable sealing under high pressure bidirectional flow and high temperature conditions, avoiding increased volume and frictional resistance.
Smart Images
Figure CN224229280U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fluid control equipment technology, and in particular to a bidirectional sealing device. Background Technology
[0002] Traditional sealing devices face the following problems under high pressure, bidirectional flow, and high-temperature tempering conditions:
[0003] Existing valves mostly rely on unidirectional sealing structures (such as V-shaped sealing rings or spiral grooves), which cannot effectively cope with bidirectional pressure alternation conditions. For example, spiral sealing structures are only suitable for unidirectional rotation, and reverse pressure can easily lead to seal failure; butterfly valves have a significantly increased risk of leakage under reverse pressure.
[0004] Conventional backfire prevention devices rely on a single barrier layer, which is easily penetrated under high-pressure backfire impact. For example, graphite block seals break due to insufficient material strength, while layered combustion body designs, although reducing the risk of backfire, cannot achieve multi-stage pressure response.
[0005] Traditional solutions improve sealing by adding seals or increasing cylinder pressure, but this results in increased volume and frictional resistance. Utility Model Content
[0006] The main objective of this invention is to provide a bidirectional sealing device, aiming to solve the problem that conventional backfire prevention devices rely on a single barrier layer, which is easily penetrated under high-pressure backfire impact. For example, graphite block seals break due to insufficient material strength, while layered combustion body designs, although reducing the risk of backfire, cannot achieve multi-stage pressure response. Traditional solutions improve sealing by stacking seals or adding cylinder compression, but this leads to technical problems such as increased volume and frictional resistance.
[0007] To achieve the aforementioned objectives, the first aspect of this utility model provides a bidirectional sealing device, comprising:
[0008] A copper valve core assembly, comprising a copper valve core body, a first sealing ring disposed on the outer periphery of the copper valve core body, and a first spring installed at one end of the copper valve core body;
[0009] The first copper core assembly includes a first copper core body, a second sealing ring disposed on the outer periphery of the first copper core body, and a second spring mounted on the first copper core body;
[0010] The second copper core assembly includes a second copper core body, a third sealing ring disposed at the head end of the second copper core, and a third spring installed on the outer wall of the second copper core.
[0011] The first copper core sub-assembly and the second copper core sub-assembly form an anti-backflow structure. The copper valve core assembly forms an axial guiding fit with the first copper core sub-body through its copper valve core body. The two ends of the first spring abut against the copper valve core body and the first copper core sub-body, respectively. The two ends of the second spring abut against the first copper core body and the second copper core body, respectively. The two ends of the third spring abut against the outer wall of the second copper core sub-assembly and the inner wall of the first copper core assembly, respectively.
[0012] Furthermore, the guiding and mating structure of the first copper core body includes a guide cylinder, and the guide cylinder is inserted into a corresponding circular hole at one end of the copper valve core body.
[0013] Furthermore, the first sealing ring is disposed on the outer periphery of the end of the copper valve core body, the second sealing ring is disposed on the outer periphery of the middle section of the first copper core sub-body, and the third sealing ring is disposed on the end face of the head of the second copper core sub-body.
[0014] Furthermore, the first spring is a compression spring, and its preload direction is opposite to the direction of medium flow.
[0015] Furthermore, the spring constant of the second spring is greater than that of the third spring.
[0016] Furthermore, the first sealing ring, the second sealing ring, and the third sealing ring are made of high-temperature resistant elastic material, and the high-temperature resistant elastic material includes at least one of fluororubber or silicone rubber.
[0017] Furthermore, the outer peripheral surfaces of the copper valve core assembly, the first copper core sub-assembly, and the second copper core sub-assembly are each provided with a plurality of circular holes.
[0018] Beneficial effects:
[0019] 1. This utility model adopts a three-stage sealing structure (copper valve core assembly, first / second copper core sub-assemblies), and achieves pressure gradient response through springs with different elastic coefficients. During forward flow, the first sealing ring opens to form the main passage; during reverse check flow, the third sealing ring and the second sealing ring close in two stages, which greatly reduces the leakage rate compared with the traditional single-stage seal.
[0020] 2. The sealing ring of this utility model is made of high temperature resistant composite material, which enhances its resistance to heat deformation. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of a bidirectional sealing device according to an embodiment of the present invention;
[0022] Figure 2 This is an exploded schematic diagram of a bidirectional sealing device according to an embodiment of the present invention;
[0023] Figure 3This is a plan view of a bidirectional sealing device according to an embodiment of the present invention.
[0024] in:
[0025] 1-Copper valve core assembly; 11-Copper valve core body; 12-First sealing ring; 13-First spring; 2-First copper core sub-assembly; 21-First copper core body; 22-Second sealing ring; 23-Second spring; 3-Second copper core assembly; 31-Second copper core body; 32-Third sealing ring; 33-Third spring.
[0026] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0027] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
[0028] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly and specifically defined.
[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0031] Reference Figures 1-3 One embodiment of this utility model provides a bidirectional sealing device, comprising:
[0032] A copper valve core assembly 1, comprising a copper valve core body 11, a first sealing ring 12 disposed on the outer periphery of the copper valve core body 11, and a first spring 13 installed at one end of the copper valve core body 11;
[0033] The first copper core assembly 2 includes a first copper core body 21, a second sealing ring 22 disposed on the outer periphery of the first copper core body 21, and a second spring 23 mounted on the first copper core body 21;
[0034] The second copper core assembly 3 includes a second copper core body 31, a third sealing ring 32 disposed at the head end of the second copper core, and a third spring 33 installed on the outer wall of the second copper core.
[0035] The first copper core assembly 2 and the second copper core assembly 3 form an anti-backflow structure. The copper valve core assembly 1 forms an axial guiding fit with the first copper core body 21 through its copper valve core body 11. The two ends of the first spring 13 abut against the copper valve core body 11 and the first copper core body 21, respectively. The two ends of the second spring 23 abut against the first copper core body 21 and the second copper core body 31, respectively. The two ends of the third spring 33 abut against the outer wall of the second copper core assembly 3 and the inner wall of the first copper core assembly 2, respectively. The first sealing ring 12 is disposed on the outer periphery of the end of the copper valve core body 11, the second sealing ring 22 is disposed on the outer periphery of the middle section of the first copper core body 21, and the third sealing ring 32 is disposed on the end face of the head of the second copper core assembly 21.
[0036] In this embodiment, an annular groove is machined on the outer circumference of the end of the copper valve core body 11 for assembling the first sealing ring 12. Fluororubber is preferred as the material, with a temperature resistance ≥200℃. A guide cylinder extends from the front end of the first copper core sub-body 21, its diameter matching the diameter of the circular hole at the front end of the copper valve core body 11, forming an axial sliding pair after insertion. An annular groove is provided in the middle section of the body for embedding the second sealing ring 22. The second sealing ring 22 is made of silicone rubber and its thickness is increased by 20% compared to the first sealing ring 12 to enhance radial sealing. A second spring 23 is fitted onto the outside of the guide cylinder, with its two ends abutting against the boss of the first copper core sub-body 21 and the end face of the second copper core sub-assembly 3, respectively. The spring pre-compression is set to 30% of the total stroke to ensure rapid response to pressure changes. An annular groove is machined on the head end face of the second copper core body 31 for embedding the third sealing ring 32. The third sealing ring 32 is made of a fluororubber and graphite composite material, achieving high-pressure blocking through end-face sealing. The outer wall of the main body is provided with an annular flange for fixing the third spring 33, the other end of which abuts against the limiting step of the inner cavity of the first copper core assembly 2.
[0037] The elastic coefficient of the third spring 33 is k3, the elastic coefficient of the second spring 23 is k2 = 2k3, and the first spring 13 is a compression spring with an elastic coefficient of k1.
[0038] Preventing backflow structure:
[0039] During forward flow, the medium pressure pushes the copper valve core assembly 1 to compress the first spring 13 and move backward, and the first sealing ring 12 disengages from the valve seat to form a passage; at the same time, the second copper core sub-assembly 3 moves forward under the pressure of the medium, overcoming the resistance of the third spring 33, and the third sealing ring 32 remains closed.
[0040] When the flow reverses, the reverse pressure forces the second copper core assembly 3 to move backward, and the third sealing ring 32 contacts the valve seat to form a primary seal; when the pressure continues to increase, the second spring 23 is compressed, causing the first copper core assembly 2 to move backward synchronously, and the second sealing ring 22 contacts the valve body to form a secondary seal. The double-stage blocking achieves the prevention of backflow.
[0041] Optionally, the guiding and mating structure of the first copper core body 21 includes a guide cylinder, and the guide cylinder is inserted into a corresponding circular hole at one end of the copper valve core body 11.
[0042] The copper valve core body 11 has an axial circular hole at its front end, and the hole diameter is clearance-fitted with the guide cylinder of the first copper core sub-assembly 2 to form an axial guide channel.
[0043] The first spring 13 is a compression spring, and its preload direction is opposite to the direction of medium flow. The elastic coefficient of the second spring 23 is greater than that of the third spring 33.
[0044] The first spring 13 is fitted onto the front end of the copper valve core body 11, with one end abutting against the stepped surface of the body and the other end pre-pressed against the end face of the first copper core sub-body 21. The spring preload is in the opposite direction to the medium flow direction, and under normal conditions, it pushes the copper valve core assembly 1 to move towards the closed position.
[0045] The outer circumferential surfaces of the copper valve core assembly 1, the first copper core sub-assembly 2, and the second copper core assembly 3 are each provided with a number of circular holes. These circular holes are spaced apart on the outer circumferential surfaces of the three assemblies to balance the internal pressure.
[0046] Optionally, the first sealing ring 12, the second sealing ring 22 and the third sealing ring 32 are made of high-temperature resistant elastic materials, and the high-temperature resistant elastic materials include at least one of fluororubber or silicone rubber.
[0047] Furthermore, under high-temperature conditions, the first sealing ring 12 is replaced with a composite structure of silicone rubber coated with PTFE, and the thickness is increased to 3mm. The third sealing ring 32 adopts a double-layer fluororubber + metal skeleton.
[0048] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.
Claims
1. A bidirectional sealing device, characterized in that, include: A copper valve core assembly (1) includes a copper valve core body (11), a first sealing ring (12) disposed on the outer periphery of the copper valve core body (11), and a first spring (13) installed at one end of the copper valve core body (11). The first copper core sub-assembly (2) includes a first copper core sub-body (21), a second sealing ring (22) disposed on the outer periphery of the first copper core sub-body (21), and a second spring (23) mounted on the first copper core sub-body (21); The second copper core assembly (3) includes a second copper core body (31), a third sealing ring (32) disposed at the head end of the second copper core, and a third spring (33) installed on the outer wall of the second copper core; The first copper core sub-assembly (2) and the second copper core sub-assembly (3) form an anti-backflow structure. The copper valve core assembly (1) forms an axial guiding fit with the first copper core sub-body (21) through its copper valve core body (11). The two ends of the first spring (13) abut against the copper valve core body (11) and the first copper core sub-body (21) respectively. The two ends of the second spring (23) abut against the first copper core sub-body (21) and the second copper core body (31) respectively. The two ends of the third spring (33) abut against the outer wall of the second copper core sub-assembly (3) and the inner wall of the first copper core assembly (2) respectively.
2. The bidirectional sealing device according to claim 1, characterized in that, The guiding structure of the first copper core body (21) includes a guide cylinder, and the guide cylinder is inserted into a corresponding circular hole at one end of the copper valve core body (11).
3. The bidirectional sealing device according to claim 1, characterized in that, The first sealing ring (12) is disposed on the outer periphery of the end of the copper valve core body (11), the second sealing ring (22) is disposed on the outer periphery of the middle section of the first copper core sub-body (21), and the third sealing ring (32) is disposed on the end face of the head of the second copper core.
4. The bidirectional sealing device according to claim 1, characterized in that, The first spring (13) is a compression spring, and its preload direction is opposite to the direction of medium flow.
5. The bidirectional sealing device according to claim 1, characterized in that, The elastic coefficient of the second spring (23) is greater than that of the third spring (33).
6. The bidirectional sealing device according to claim 1, characterized in that, The first sealing ring (12), the second sealing ring (22) and the third sealing ring (32) are made of high-temperature resistant elastic materials, and the high-temperature resistant elastic materials include at least one of fluororubber or silicone rubber.
7. The bidirectional sealing device according to claim 1, characterized in that, The outer circumferential surfaces of the copper valve core assembly (1), the first copper core sub-assembly (2), and the second copper core sub-assembly (3) are all provided with several round holes.