Embedded type soft sealing valve seat

Abstract

The utility model relates to the technical field of valves, in particular to an embedded type soft sealing valve seat which comprises a hard seat, a soft seat and an elastic sealing piece, an embedded cavity extending in the axial direction of the hard seat and a balance hole extending in the radial direction and communicated with the embedded cavity to balance internal and external pressure of the embedded cavity are formed in the hard seat, and the soft seat is embedded in the embedded cavity to form soft sealing with a valve element. The elastic sealing piece is located between the hard base and the soft base and used for providing sealing pre-tightening force for the soft base. The elastic sealing piece and the soft seat jointly form a valve seat sealing structure, the elastic sealing piece has a self-sealing function and can provide pre-tightening force for the soft seat through elasticity of the elastic sealing piece, the sealing face of the soft seat makes contact with the valve element for sealing, the balance hole can release pressure in the embedded cavity in time, and the sealing effect is good. The soft seat is prevented from being ejected out of the embedding cavity to be damaged under the action of internal and external pressure difference, the sealing performance of the soft seat is improved, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially relates to a kind of inlaying type soft sealing valve seat. BACKGROUND

[0002] Valve seat is the component that the valve core in valve and its cooperation surface contact, for realizing the closing and adjustment of valve, provide support force in full close position for valve core, and form sealing pair with valve core.Valve seat sealing performance is the key factor to determine the leakage of valve.Valve seat sealing is divided into hard sealing and soft sealing, hard sealing refers to the valve seat material is metal, its precision machining, ensure the cooperation precision of valve core (ball).Soft sealing refers to the sealing material of valve seat or inlaying in valve seat is non-metal material, soft sealing material has certain elasticity, so the processing precision requirement is relatively lower than hard sealing.

[0003] The inlaying type soft sealing valve seat currently used is all that soft seat is directly embedded in metal seat, when medium is gas, V-shaped notch valve is switched many times, because the gas pressure imbalance between embedding cavity and cavity outside, soft seat is easily damaged, influence soft seat sealing performance and service life. SUMMARY

[0004] The technical problem to be solved by the utility model is: in order to solve the problem that inlaying type soft sealing valve seat in prior art is all that soft seat is directly embedded in metal seat, when medium is gas, V-shaped notch valve is switched many times, because the gas pressure imbalance between embedding cavity and cavity outside, soft seat is easily damaged, influence soft seat sealing performance and service life, now provide a kind of inlaying type soft sealing valve seat.

[0005] To solve the above technical problem, the utility model adopts the following technical scheme: a kind of inlaying type soft sealing valve seat, including:

[0006] Hard seat, inside is formed with embedding cavity extending along its axial direction and balance hole extending along radial direction and being communicated with embedding cavity to balance the pressure inside and outside embedding cavity;

[0007] Soft seat, it is embedded in embedding cavity to form soft sealing with valve core;

[0008] And elastic sealing member, it is located between embedding cavity cavity bottom and soft seat for providing sealing pre-tightening force for soft seat.

[0009] Further, the side of the soft seat is inclined to form a slope, the hard seat includes a pressing edge corresponding to the slope, the pressing edge allows the soft seat to enter the embedding cavity and deform after entering to fit the slope to limit the soft seat in the embedding cavity.

[0010] Further, the slope is gradually inclined inward along the direction close to the valve core for the outer peripheral wall of the soft seat.

[0011] Further, the soft seat further comprises an equal diameter section connected with the slope surface and close to the elastic sealing piece, and the hard seat comprises a pressing section corresponding to the equal diameter section and connected with the pressing edge, wherein the thickness of the pressing section is greater than the thickness of the pressing edge.

[0012] Further, the embedding cavity has an inner cavity wall and an outer cavity wall, and the balance hole penetrates the outer cavity wall in the radial direction to communicate with the embedding cavity.

[0013] Further, the elastic sealing piece is an O-shaped sealing ring.

[0014] Further, the soft seat sealing surface is an arc surface.

[0015] Further, the balance hole is arranged in multiple groups in the circumferential direction of the hard seat, and the balance holes in each group are also distributed at intervals in the circumferential direction of the hard seat.

[0016] Further, the slope surface has an inclination angle of 15°-20°.

[0017] The utility model discloses a valve seat sealing structure which comprises a hard seat and a soft seat, wherein the soft seat is embedded in the hard seat, and the soft seat is provided with a balance hole. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model will be further explained in connection with the drawings and examples.

[0019] Fig. 1 It is the structure schematic drawing of the hard seat before the soft seat of the utility model is pressed into the hard seat;

[0020] Fig. 2 It is the assembly schematic drawing of the soft seat and the hard seat after the soft seat of the utility model is pressed into the hard seat;

[0021] Fig. 3 It is the structure schematic drawing of the balance hole;

[0022] In the drawing:

[0023] 1, hard seat;101, embedding cavity;102, balance hole;103, pressing edge;104, pressing section;

[0024] 2, soft seat;201, slope surface;202, equal diameter section;203, sealing surface;

[0025] 3, elastic sealing piece. DETAILED DESCRIPTION

[0026] The utility model will be further explained in detail in combination with the drawings. These drawings are all simplified schematic diagrams, and only schematically show the basic structure of the utility model, so they only show the structure related to the utility model, and the direction and reference (such as up, down, left, right, etc.) can only be used to help the description of the features in the drawings. Therefore, the following specific embodiments are not used in a restrictive sense, and the scope of the claimed subject matter is only defined by the appended claims and their equivalents.

[0027] As shown in Figs. 1-3 A mosaic type soft sealing valve seat, comprising a hard seat 1, a soft seat 2 and an elastic sealing element 3;

[0028] The hard seat 1 is made of metal, preferably stainless steel, and has an embedding cavity 101 extending in the axial direction and a balance hole 102 extending in the radial direction and communicating with the embedding cavity 101 to balance the pressure inside and outside the embedding cavity 101. The embedding cavity 101 has an annular structure, one end of which is blocked, and the other end has an opening towards the valve core.

[0029] The soft seat 2 is embedded in the embedding cavity 101, and the sealing surface 203 of the soft seat 2 extends out of the embedding cavity 101 to form a soft seal with the valve core. When the valve is working, the valve core moves from the open position to the closed position, and the soft seat 2 provides a sealing contact surface. The seal between the valve core and the valve seat is achieved by the pre-tightening sealing force of the valve seat pressing the valve core. During the process of using the jig to press the soft seat 2 into the embedding cavity 101, gas can be discharged from the balance hole 102 to release the pressure and reduce the resistance of pressing in. When the medium passing through is gas during use, internal pressure will be generated during the repeated opening and closing of the valve core. The balance hole 102 can ensure that the pressure in the embedding cavity does not exceed the safety limit, and at the same time, the external air can enter to maintain the balance of the internal and external pressures.

[0030] The elastic sealing element 3 is located between the cavity bottom of the embedding cavity 101 and the soft seat 2, and has a self-sealing effect. The sealing performance is reliable, and at the same time, the elastic sealing element 3 automatically compensates for the sealing pre-tightening force of the soft seat 2 by utilizing its own elastic properties, so that the valve core and the valve seat sealing surface 203 are in close contact, thereby achieving good sealing performance.

[0031] During installation, the elastic sealing element 3 and the soft seat 2 are pressed into the embedding cavity 101 of the hard seat 1 in sequence. When the valve is closed, the initial sealing force is generated by the back pressure disc spring (spring) in the valve, and the auxiliary sealing force is generated by the fluid pressure difference. When the soft seat 2 contacts the valve core, the elastic sealing element 3 and the soft seat 2 together form a valve seat sealing structure. The elastic sealing element 3 has a self-sealing effect, and it can provide pre-tightening force for the soft seat 2 by utilizing its own elasticity. The soft seat 2 sealing surface 203 contacts the valve core to seal, and the balance hole 102 can release the pressure inside the embedding cavity 101 in time to avoid the soft seat 2 being pushed out of the embedding cavity 101 due to the action of the internal and external pressure difference, which can cause damage, thereby improving the sealing performance and service life of the soft seat 2.

[0032] In some examples, the soft seat 2 is inclined on one side to form a slope surface 201, that is, the soft seat 2 has a large end and a small end to form a conical structure, and the small end is close to the valve core. The hard seat 1 comprises a pressing edge 103 corresponding to the slope surface 201, which allows the soft seat 2 to enter the embedding cavity 101 and deform after entering to fit the slope surface 201 to limit the soft seat 2 in the embedding cavity 101; in the initial state, the pressing edge 103 is horizontal, that is, the embedding cavity 101 is an equal-diameter structure, and the soft seat 2 can enter the embedding cavity 101 from the opening thereof, and then the pressing edge 103 is processed to fit the slope surface 201 of the soft seat 2 by a tool, that is, the embedding cavity 101 is a closed structure at this time, which can limit the soft seat 2 in the embedding cavity 101 and improve the fixing effect of the soft seat 2.

[0033] In some examples, the slope surface 201 is gradually inclined inward along the direction close to the valve core on the outer peripheral wall of the soft seat 2, that is, the slope surface 201 is formed on the outer peripheral wall of the soft seat 2. Correspondingly, the slope surface 201 can also be formed on the inner peripheral wall of the soft seat 2. Considering the processing difficulty and sealing effect, the slope surface 201 is preferably on the outer peripheral wall of the soft seat 2.

[0034] In some examples, the soft seat 2 further comprises an equal-diameter section 202 connected with the slope surface 201 and close to the elastic sealing element 3, and the equal-diameter section 202 is connected with the large end of the slope surface 201 to have sufficient thickness and structural strength. The hard seat 1 comprises a pressing section 104 connected with the pressing edge 103 and corresponding to the equal-diameter section 202, and the thickness of the pressing section 104 is greater than that of the pressing edge 103. The large-thickness pressing section 104 presses the large-thickness equal-diameter section 202 to improve the fixing effect of the soft seat 2.

[0035] In some examples, the embedding cavity 101 has an inner cavity wall and an outer cavity wall, and the outer cavity wall surrounds the outer side of the inner cavity wall. The balance hole 102 penetrates the outer cavity wall in the radial direction to communicate with the embedding cavity 101. Correspondingly, the balance hole 102 can also penetrate the inner cavity wall in the radial direction, but the processing difficulty is greater. Therefore, the balance hole 102 is preferably on the outer cavity wall.

[0036] In some examples, the elastic sealing element 3 is an O-shaped sealing ring, which has simple structure and light weight and has sealing effect in the axial and radial directions. Of course, it can also be an H-shaped sealing ring or other structures.

[0037] In some examples, the sealing surface 203 of the soft seat 2 is an arc surface, which can be smoothly transitioned relative to a plane, is not easy to be damaged, and has better sealing effect. Even if the valve seat or the valve core is slightly offset, the performance of the sealing surface 203 will not be affected.

[0038] In some examples, the balance holes 102 are arranged in multiple groups circumferentially along the hard seat 1, and the balance holes 102 in each group are also spaced circumferentially along the hard seat 1. The number of groups of the balance holes 102 is not limited in the embodiment, and can be three groups, four groups, etc. The number of the balance holes 102 in each group is also not limited, and can be four, five, or six, etc.

[0039] In some examples, the slope surface 201 has an inclination angle of 15-20°, which can ensure the area of the sealing surface 203 while clamping the soft seat 2, so as to improve the fixing effect of the soft seat 2 without affecting the sealing effect.

[0040] Working principle:

[0041] During installation, the elastic sealing member 3 and the soft seat 2 are pressed into the embedding cavity 101 of the hard seat 1 in sequence, then the pressing edge 103 is processed to be attached to the slope surface 201 of the soft seat 2 by a tool to limit the soft seat 2 in the hard seat 1, then when the soft seat 2 contacts the valve core, the elastic sealing member 3 and the soft seat 2 jointly form a valve seat sealing structure, the elastic sealing member 3 has a self-sealing effect, and can provide a pre-tightening force for the soft seat 2 by using its elasticity, the sealing surface 203 of the soft seat 2 contacts the valve core to seal, and the balance holes 102 can timely release the pressure in the embedding cavity 101, so as to avoid the soft seat 2 from being damaged due to being pushed out of the embedding cavity 101 by the effect of the internal and external pressure difference, and improve the sealing performance and service life of the soft seat 2.

[0042] Based on the above ideal embodiments of the present application, the related personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited by the content of the specification, and must be determined by the scope of the claims.

Claims

1. A soft-seated, mosaic valve seat, characterized by: The utility model relates to a valve seat structure, which comprises: a hard seat (1) internally formed with an embedding cavity (101) extending along its axial direction and a balance hole (102) extending along the radial direction and communicating with the embedding cavity (101) to balance the pressure inside and outside the embedding cavity (101); a soft seat (2) embedded in the embedding cavity (101) to form a soft seal with the valve core; and an elastic sealing member (3) located between the cavity bottom of the embedding cavity (101) and the soft seat (2) to provide a sealing pre-tightening force for the soft seat (2).

2. An inlay soft seal valve seat according to claim 1, wherein: The soft seat (2) is formed with a slope (201) on one side, and the hard seat (1) comprises a pressing edge (103) corresponding to the slope (201), which allows the soft seat (2) to enter the embedding cavity (101) and be deformed to fit the slope (201) to limit the soft seat (2) in the embedding cavity (101) after entering.

3. An inlay soft seal valve seat according to claim 2, wherein: The slope (201) is formed by gradually inclining the outer peripheral wall of the soft seat (2) in the direction close to the valve core.

4. A soft-seal insert valve seat according to claim 2, wherein: The soft seat (2) further comprises a constant diameter section (202) connected with the slope (201) and close to the elastic sealing member (3), and the hard seat (1) comprises a pressing section (104) connected with the pressing edge (103) and corresponding to the constant diameter section (202), and the thickness of the pressing section (104) is greater than that of the pressing edge (103).

5. The inlaid soft seal valve seat of claim 1 wherein: The embedding cavity (101) has an inner cavity wall and an outer cavity wall, and the balance hole (102) penetrates the outer cavity wall along the radial direction to communicate with the embedding cavity (101).

6. The inlaid soft seal valve seat of claim 1 wherein: The elastic sealing member (3) is an O-shaped sealing ring.

7. The inlaid soft seal valve seat of claim 1 wherein: The sealing surface (203) of the soft seat (2) is an arc surface.

8. The inlaid soft seal valve seat of claim 1 wherein: The balance hole (102) is arranged in multiple groups along the circumference of the hard seat (1), and several balance holes (102) in each group are also distributed at intervals along the circumference of the hard seat (1).

9. The inlaid soft seal valve seat of claim 2 wherein: The slope (201) has an inclination angle of 15°-20°.

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