Sealing type valve seat

Abstract

The utility model relates to the field of sealing type valve seats, and discloses a sealing type valve seat. Comprising a pressure-resistant base body, the pressure-resistant base body is located in a valve body cavity, a multi-layer composite sealing ring is fixed to the surface of the pressure-resistant base body, the multi-layer composite sealing ring is composed of two sealing layers made of different materials, an expansion compensation ring is arranged outside the multi-layer composite sealing ring, and the expansion compensation ring is tightly attached to the multi-layer composite sealing ring. The pressure-resistant base body is provided with a self-fastening wedge-shaped body, the self-fastening wedge-shaped body is located at the front end of the pressure-resistant base body, a pressure balance groove is formed in the sealing valve seat, and the pressure balance groove is connected with an external medium. When the sealing valve seat is used, the multi-layer composite sealing ring fixed to the surface of the pressure-resistant base body and the expansion compensation ring arranged outside the multi-layer composite sealing ring start to work, and when the expansion compensation ring is subjected to temperature change, the expansion compensation ring changes to generate axial expansion and abuts against the interior of the valve seat, so that leakage caused by temperature difference is prevented, and the sealing performance of the device is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealed valve seats, and particularly relates to a sealed valve seat. Background Technique

[0002] A valve seat is a detachable surface component inside a valve, used to support the fully closed position of the valve core and form a sealing pair. Currently, existing valve seats are prone to burning during a fire, causing the valve to leak materials easily. Moreover, due to the long-term interaction between the valve seat and the valve core, the valve seat is prone to wear, the sealing performance between the valve seat and the valve is poor, and when the contact surface between the valve seat and the valve core is damaged, the entire valve seat needs to be disassembled, which is likely to cause damage to the valve during the disassembly process, making it inconvenient for fire prevention, wear resistance, and sealing. At the same time, it is not convenient to disassemble and replace the contact part between the valve seat and the valve core, unable to meet the usage requirements. Therefore, we propose a fireproof and sealed valve seat to solve the above problems.

[0003] After retrieval, the publicly cited patent with the publication number CN217001587U and the publication date of July 19, 2022, titled "A Fireproof and Sealed Valve Seat" includes a metal ring. A first ring is slidably connected to the inner wall of the metal ring, and four rectangular cavities are arranged in a circular distribution on the metal ring. The inner wall of the first ring is provided with an inclined surface with a flared opening. Four rectangular grooves with top openings are arranged in a circular distribution on the inner wall of the metal ring. Four trapezoidal blocks are fixedly connected to the outer side of the first ring and are arranged in a circular distribution. The side of the trapezoidal block close to the corresponding rectangular cavity is set as an inclined surface, and a first circular groove is opened on the side of the trapezoidal block close to the corresponding rectangular cavity. The trapezoidal block is clamped with the corresponding rectangular groove. The utility model solves the problem of inconvenient disassembly and replacement of the contact part between the valve seat and the valve core through the cooperation of the second ring, spring, second round rod, and flexible steel rope.

[0004] However, this device still has the following defects: It cannot ensure its sealing performance and the gas driving force brought by the outside world when the valve seat encounters temperature differences, reducing the sealing performance of the device and also reducing the flexibility of the device. Content of the Utility Model

[0005] The purpose of the utility model is to provide a sealed valve seat to solve the problem in the above background technique that the existing valve seat cannot ensure its sealing performance and the gas driving force brought by the outside world when the valve seat encounters temperature differences.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] The sealing valve seat comprises a pressure-resistant base, the pressure-resistant base is located in the valve body cavity, a multi-layer composite sealing ring is fixed on the surface of the pressure-resistant base, the multi-layer composite sealing ring is composed of two layers of sealing layers made of different materials, an expansion compensation ring is arranged outside the multi-layer composite sealing ring, and the expansion compensation ring is tightly fitted with the multi-layer composite sealing ring;

[0008] The pressure-resistant base is provided with a self-tightening wedge-shaped body, and the self-tightening wedge-shaped body is located at the front end of the pressure-resistant base. A pressure balancing groove is opened inside the sealing valve seat, and the pressure balancing groove is connected to the external medium.

[0009] As another preferred solution of the utility model, the multi-layer composite sealing ring comprises a first metal layer and a second elastic material layer, wherein the first metal layer is closely attached to the surface of the pressure-resistant substrate.

[0010] As another preferred solution of the utility model, a plurality of groups of designed springs are arranged between the expansion compensation ring and the multi-layer composite sealing ring, and the plurality of groups of designed springs are evenly distributed in the outer annular groove and spaced apart from each other.

[0011] As another preferred solution of the utility model, the pressure balancing groove is composed of a plurality of small channels, and the pressure balancing groove is in a labyrinth sealing pattern.

[0012] As another preferred embodiment of the present invention, a positioning stop key is additionally provided at the end of the self-tightening wedge-shaped body, and the positioning stop key is a rectangular structure.

[0013] As another preferred embodiment of the present invention, the self-tightening wedge-shaped body is in a conical shape, and after being optimized, the self-tightening wedge-shaped body can be firmly clamped for a long time without external force.

[0014] As another preferred solution of the utility model, the pressure-resistant base is provided with reinforcing ribs, and the reinforcing ribs are an embedded structure.

[0015] As another preferred solution of the utility model, the expansion compensation ring has a built-in spring device, and the spring device is spiral-shaped.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. When using this sealing valve seat, the multi-layer composite sealing ring fixed on the surface of the pressure-resistant substrate and the expansion compensation ring configured outside it start to work. When the expansion compensation ring is subject to temperature changes, it changes and produces axial expansion and presses against the inside of the valve seat to prevent leakage caused by temperature differences, thereby improving the sealing of this device.

[0018] 2. The complex structure of the pressure balance groove makes it difficult for the internal gas to pass directly. Only when there is a large enough difference between the two sides can the groove allow part of the fluid to pass through to alleviate the instantaneous impact force and avoid direct damage to the valve seat material to cause leakage failure caused by the penetration path, further improving the sealing quality of this device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a sealing valve seat according to an embodiment of the utility model is shown;

[0020] Figure 2 A schematic diagram of a multi-layer composite sealing ring according to an embodiment of the utility model is shown;

[0021] Figure 3 A cross-sectional schematic diagram of a pressure balancing tank according to an embodiment of the utility model is shown;

[0022] Figure 4 A structural schematic diagram of a spring device according to an embodiment of the utility model is shown.

[0023] In the figure: 1. Pressure-resistant substrate; 2. Multi-layer composite sealing ring; 3. Expansion compensation ring; 4. Self-tightening wedge; 5. Pressure balance groove; 6. Reinforcing ribs; 7. First metal layer; 8. Second elastic material layer; 9. Designed spring; 10. Positioning stop key; 11. Spring device. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figures 1-4 , the utility model provides the following embodiments:

[0026] A sealing valve seat includes a pressure-resistant substrate 1, the pressure-resistant substrate 1 is located in the valve body cavity, a multi-layer composite sealing ring 2 is fixed on the surface of the pressure-resistant substrate 1, and the multi-layer composite sealing ring 2 is composed of two layers of sealing layers of different materials. An expansion compensation ring 3 is arranged outside the multi-layer composite sealing ring 2, and the expansion compensation ring 3 is tightly fitted with the multi-layer composite sealing ring 2.

[0027] Specifically, the multi-layer composite sealing ring 2 is used to adapt to and enhance the sealing effect under high pressure environment; at the same time, the expansion compensation ring 3 is set to cause axial expansion due to temperature changes to press against the inside of the valve seat to prevent leakage caused by temperature difference.

[0028] The pressure-resistant base body 1 is provided with a self-fastening wedge body 4, and the self-fastening wedge body 4 is located at the front end of the pressure-resistant base body 1. A pressure balance groove 5 is formed inside the sealing valve seat, and the pressure balance groove 5 is connected to the external medium. The pressure-resistant base body 1 is provided with a reinforcing rib 6, and the reinforcing rib 6 is of an embedded structure.

[0029] Specifically, the self-fastening wedge body 4 realizes the automatic clamping and sealing function by contacting the valve closing component and by means of the hydrodynamic effect and the contact pressure;

[0030] In addition, the pressure balance groove 5 is arranged inside the sealing valve seat and is connected to the external medium to balance the pressure difference on both sides of the seal, thereby reducing the pressure difference burden acting on the valve seat and reducing the leakage probability. Through the cooperation among the pressure-resistant base body 1, the multi-layer composite sealing ring 2, the expansion compensation ring 3 and the self-fastening wedge body 4, the purpose of reliable and stable sealing under high pressure is achieved, and the technical problem of easy leakage in a high-pressure environment is solved;

[0031] In addition, the embedded reinforcing rib 6 plays a role in improving the strength and stability of the base body structure, further effectively supporting the composite sealing ring, and ensuring that the deformation under extremely high pressure conditions is within an acceptable range, thereby fundamentally enhancing the ability of the entire device to resist high-pressure damage.

[0032] The multi-layer composite sealing ring 2 includes a first metal layer 7 and a second elastic material layer 8, wherein the first metal layer 7 is closely attached to the surface of the pressure-resistant base body 1. A number of design springs 9 are arranged between the expansion compensation ring 3 and the multi-layer composite sealing ring 2, and the number of design springs 9 are evenly distributed in the outer annular groove and are spaced apart from each other.

[0033] Specifically, the first metal layer 7 can provide rigid support, while the second elastic material layer 8 ensures good flexible sealing performance under high pressure. The double-layer combination can adapt to a wider range of pressure change conditions;

[0034] In addition, the expansion compensation ring 3 is fixed to the multi-layer composite sealing ring 2 by a number of design springs 9 that are evenly distributed in the outer annular groove and are spaced apart from each other. This structure allows the compensation ring to flexibly expand and contract with temperature changes to adjust the size, thereby tightly pressing against the inner wall of the valve body and eliminating the risk of gaps caused by temperature differences.

[0035] The self-fastening wedge body 4 is designed in a conical surface shape and automatically adjusts the pressing force by relying on the driving force of flowing liquid or gas during the opening and closing process of the valve. The pressure balance groove 5 is composed of a combination of multiple small channels, and the pressure balance groove 5 is in the form of a labyrinth seal.

[0036] Specifically, the conical design of the self-fastening wedge 4 enables it to be firmly clamped without external force for a long time after optimization, significantly reducing the probability of the previous situation where the gasket often loosens and fails;

[0037] In addition, the complex structure of the pressure balance groove 5 makes it difficult for internal gas to pass directly. Only when there is a large enough difference on both sides can the groove allow some fluid to pass through to relieve the instantaneous impact force and avoid directly damaging the valve seat material and causing leakage failure due to the generation of a penetration path.

[0038] A positioning anti-reverse key 10 is added to the end of the self-fastening wedge 4, and the positioning anti-reverse key 10 is in a rectangular structure. The expansion compensation ring 3 is made of shape memory alloy.

[0039] Specifically, the positioning anti-reverse key 10 enables the wedge to only translate on a predetermined track without any deviation in any direction, thereby achieving an improved reliability advantage index performance that ensures the wedge remains in an ideal contact state and continues to function effectively even under long-term high-pressure fluid scouring;

[0040] In addition, the expansion compensation ring 3 is made of a shape memory alloy. Under extreme temperature fluctuations, this material will change its own physical properties according to the previously preset information to compensate for the micro-gaps caused by thermal expansion and contraction, further reducing the possibility of liquid leakage at the connection due to inconsistent material properties.

[0041] A spring device 11 is built into the expansion compensation ring 3, and the spring device 11 is in a spiral shape.

[0042] Specifically, by incorporating an elastic element such as the spiral spring device 11, it can respond immediately to changes in the ambient temperature and actively adjust to the optimal working attitude angle in different environments.

[0043] Working Principle

[0044] When using this sealed valve seat, the multi-layer composite sealing ring 2 fixed on the surface of the pressure-resistant base 1 and the expansion compensation ring 3 configured outside it start to work. When the expansion compensation ring 3 is affected by temperature changes, it expands axially and presses against the inside of the valve seat to prevent leakage caused by temperature differences.

[0045] In addition, the complex structure of the pressure balance groove 5 makes it difficult for internal gas to pass directly. Only when there is a large enough difference on both sides can the groove allow some fluid to pass through to relieve the instantaneous impact force and avoid directly damaging the valve seat material and causing leakage failure due to the generation of a penetration path.

[0046] All technical features in this embodiment can be freely combined according to actual needs.

[0047] The above embodiments are preferred implementation solutions of the present utility model. In addition, the present utility model can also be implemented in other ways. Any obvious replacement without departing from the concept of the technical solution is within the protection scope of the present utility model.

Claims

1. A sealing valve seat, comprising a pressure-resistant base (1), characterized in that: The pressure-resistant base (1) is located in the main body cavity of the valve. A multi-layer composite sealing ring (2) is fixed on the surface of the pressure-resistant base (1). The multi-layer composite sealing ring (2) is composed of two layers of sealing layers made of different materials. An expansion compensation ring (3) is arranged outside the multi-layer composite sealing ring (2). The expansion compensation ring (3) is tightly fitted with the multi-layer composite sealing ring (2). The pressure-resistant base (1) is provided with a self-tightening wedge (4), and the self-tightening wedge (4) is located at the front end of the pressure-resistant base (1). A pressure balancing groove (5) is provided inside the sealing valve seat, and the pressure balancing groove (5) is connected to an external medium.

2. The sealing valve seat according to claim 1, characterized in that: The multi-layer composite sealing ring (2) comprises a first metal layer (7) and a second elastic material layer (8), wherein the first metal layer (7) is tightly attached to the surface of the pressure-resistant substrate (1).

3. The sealing valve seat according to claim 1, characterized in that: A plurality of groups of designed springs (9) are arranged between the expansion compensation ring (3) and the multi-layer composite sealing ring (2); the plurality of groups of designed springs (9) are evenly distributed in the outer annular groove and are spaced apart from each other.

4. The sealing valve seat according to claim 1, characterized in that: The pressure balancing groove (5) is composed of a plurality of small channels, and the pressure balancing groove (5) is in a labyrinth seal pattern.

5. The sealing valve seat according to claim 1, characterized in that: A positioning stop key (10) is additionally provided at the end of the self-tightening wedge-shaped body (4), and the positioning stop key (10) is in a rectangular structure.

6. The sealing valve seat according to claim 1, characterized in that: The self-tightening wedge-shaped body (4) is in the shape of a conical surface, and after being optimized, the self-tightening wedge-shaped body (4) can be firmly clamped for a long time without the need for external force.

7. The sealing valve seat according to claim 1, characterized in that: The pressure-resistant base (1) is provided with reinforcing ribs (6), and the reinforcing ribs (6) are of an embedded structure.

8. The sealing valve seat according to claim 1, characterized in that: The expansion compensation ring (3) has a spring device (11) built into it, and the spring device (11) is spiral-shaped.

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