Bidirectional pressure-bearing sealing structure of high-pressure valve

Abstract

The utility model relates to a bidirectional pressure-bearing sealing structure of a high-pressure valve. The bidirectional pressure-bearing sealing structure comprises a valve body, a ball body, a ball seat, a valve seat assembly, a pressing ring and a compression spring, the ball body is of a barrel-shaped eccentric structure and is rotationally installed in the valve body through the valve rod. The ball seat is of an annular structure and is fixed on the ball body; the valve seat assembly is arranged in an outlet side groove of the valve body and connected with the pressing ring through the compression spring. The valve seat assembly corresponds to the ball seat in position; the pressing ring is fixed to the outlet side of the valve body. Compared with the prior art, a soft and hard double-sealing structure is adopted, and a good sealing effect can be achieved no matter in forward sealing or reverse sealing.

Description

TECHNICAL FIELD

[0001] The utility model relates to high pressure valve field especially is related to a high pressure valve's two -way pressure -bearing sealing structure. BACKGROUND

[0002] In modern water conservancy projects, the hydraulic power station system for high pressure pump station or high water head (water head exceeds 250 meters) is used as the valve device for overhauling or intercepting, and the reliability and water loss requirement are considered, and high pressure ball valve or half ball valve is generally selected. The utility model with publication number CN218347975U discloses a water high pressure soft and hard sealing half ball valve, and the soft sealing adopts plastic sealing element and metal pairing, and the hard sealing adopts metal and metal pairing, a compression spring is arranged on the back of the valve seat assembly to ensure the sealing property of the soft sealing under low pressure, and the medium pressure can enter the back of the valve seat assembly to push the valve seat assembly to compress the ball seat under high pressure, so that the self-sealing effect is formed, and the high pressure sealing property is ensured.

[0003] But the above structure can only bear pressure in one direction in actual application, and cannot meet the two-way pressure-bearing sealing requirement of working conditions. In addition, the plastic sealing element is used as the soft sealing, and the initial sealing specific pressure requirement of the plastic part is higher, and the spring force is often insufficient to meet the low pressure sealing. UTILITY MODEL CONTENT

[0004] The utility model discloses a two -way pressure -bearing sealing structure of high pressure valve can overcome the defects in the prior art that only one -way pressure -bearing can be carried out, and the two -way pressure -bearing sealing requirement of working conditions cannot be met.

[0005] The purpose of the utility model can be realized through the following technical schemes:

[0006] A two -way pressure -bearing sealing structure of high pressure valve, including valve body, ball, ball seat, valve seat assembly, pressure ring and compression spring;

[0007] The ball is a barrel -shaped eccentric structure and is rotatably installed in the valve body through the valve rod;

[0008] The ball seat is an annular structure and is fixed on the ball;

[0009] The valve seat assembly is arranged in the outlet side groove of the valve body and is connected with the pressure ring through the compression spring; The position of the valve seat assembly corresponds to the ball seat;

[0010] The pressure ring is fixed on the outlet side of the valve body.

[0011] Further, the valve seat assembly comprises a valve seat, a sealing ring, a sealing ring holder and a valve seat support, the sealing ring holder is fixedly connected with the valve seat, the valve seat is sleeved in the valve seat support and is axially movable, the valve seat support is connected with the compression ring through the compression spring and is axially movable, the sealing ring is fixed in the matching groove of the valve seat and the sealing ring holder and extends out of the end surface of the valve seat and the sealing ring holder.

[0012] When the ball is closed, the valve seat and the sealing ring abut against the ball seat.

[0013] Further, the outlet side groove of the valve body forms a first step matched with the sealing ring holder and the valve seat respectively.

[0014] When the ball is in the closed position, a gap I is formed between the valve seat and the first step of the outlet side groove of the valve body, and a gap II is formed between the valve seat assembly and the compression ring.

[0015] Further, the gap I is within the range of 2-3 mm, and the gap II is within the range of 5-7 mm.

[0016] Further, the cross section of the sealing ring is triangular, and the material is high-hardness explosion-proof fluorine rubber, and the hardness is within the range of HSA 95-98°.

[0017] Further, the valve seat and the ball seat are made of stainless steel and are surface-hardened with hard alloy.

[0018] Further, the valve seat support is provided with a plurality of O-shaped sealing rings and forms a seal with the valve seat and the valve body respectively.

[0019] Further, the inner side of the valve seat support is provided with a mud guard which is welded and fixed in the inner side of the valve seat support and extends to the inner side of the compression ring.

[0020] Further, the compression ring is internally provided with a cylindrical groove for mounting the compression spring.

[0021] Further, the sealing surface of the ball seat is spherical, and the ball seat forms a seal with the ball through the O-shaped ring.

[0022] Compared with the prior art, the utility model has the following advantages:

[0023] (1) The bidirectional pressure sealing structure of the high-pressure valve adopts a soft and hard double sealing structure, and can meet the bidirectional pressure sealing requirements of the working condition.

[0024] The first seal is a soft seal structure with rubber and metal paired together, and the second seal is a hard seal structure with metal paired together. The soft seal structure ensures sealing performance under low pressure, while the hard seal structure ensures that the contact stress between the rubber seal ring and the ball seat is reduced under high pressure, preventing the rubber seal ring from being crushed or from wearing and aging too quickly due to excessive contact stress.

[0025] (2) The bidirectional pressure-bearing sealing structure of the high-pressure valve provided by this utility model adopts a floating valve seat assembly structure. When under forward pressure, the medium pressure enters the back of the valve seat, and under the action of the pressure difference, the valve seat is forced to press tightly against the ball seat sealing surface. The greater the water pressure, the better the high-pressure sealing performance. When under reverse pressure, the medium pressure enters the back of the valve seat support, and under the combined action of the pressure difference and the compression spring preload, the valve seat is forced to press tightly against the ball seat sealing surface. The greater the water pressure, the better the high-pressure sealing performance. Therefore, good sealing effect can be achieved regardless of whether it is forward or reverse sealing.

[0026] (3) The bidirectional pressure-bearing sealing structure of the high-pressure valve provided by this utility model is designed with a mudguard structure. When applied to raw water conditions, it prevents mud and sand particles from entering the gap groove between the valve seat assembly and the pressure ring, thus hindering the left and right movement of the valve seat assembly and ensuring the reliable sealing of the valve. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a bidirectional pressure-bearing sealing structure for a high-pressure valve provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the forward pressure bearing principle of a bidirectional pressure-bearing sealing structure for a high-pressure valve provided in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram illustrating the reverse pressure bearing principle of a bidirectional pressure-bearing sealing structure for a high-pressure valve provided in an embodiment of the present invention.

[0030] In the diagram, 1. Valve body; 2. Ball; 3. Ball seat; 4. Valve seat assembly; 401. Valve seat; 402. Sealing ring; 403. Sealing ring retainer; 404. Valve seat support; 405. Screw; 5. First step; 6. Gap I; 7. Gap II; 8. Compression spring; 9. Pressure ring; 10. Mudguard; 11. Argon arc welding; 12. Screw. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0035] Example 1

[0036] like Figure 1 As shown, this embodiment provides a bidirectional pressure-bearing sealing structure for a high-pressure valve, including a valve body 1, a ball 2, a ball seat 3, a valve seat assembly 4, a pressure ring 9, and a compression spring 8;

[0037] The ball 2 has a barrel-shaped eccentric structure and is installed inside the valve body 1 by rotating the valve stem;

[0038] The ball seat 3 is a ring-shaped structure and is fixed on the ball 2;

[0039] The valve seat assembly 4 is disposed in the outlet side groove of the valve body 1 and is connected to the pressure ring 9 by a compression spring 8; the valve seat assembly 4 is positioned corresponding to the ball seat 3.

[0040] The pressure ring 9 is fixed to the outlet side of the valve body 1.

[0041] Specifically, the ball 2 has a barrel-shaped eccentric structure and is installed inside the valve body 1 by rotating the valve stem.

[0042] The ball seat 3 has an annular structure with a spherical sealing surface. It is fixed to the ball 2 with screws and forms a seal with the ball 2 by setting an O-ring.

[0043] The valve seat assembly 4 is located in the outlet side groove of the valve body 1 and is connected to the pressure ring 9 through the compression spring 8. The valve seat assembly 4 is positioned corresponding to the ball seat 3.

[0044] The pressure ring 9 is fixed to the outlet side of the valve body by means of screws 12.

[0045] The valve seat assembly 4 comprises a valve seat 401, a sealing ring 402, a sealing ring holder 403 and a valve seat support 404. The sealing ring holder 403 is fixedly connected to the valve seat 401. In this embodiment, the sealing ring holder 403 is fixedly connected to the valve seat 401 by means of screws 405. The valve seat 401 is fitted into the valve seat support 404 and can move axially. The valve seat support 404 is connected to the pressure ring 9 by means of a compression spring 8 and can move axially. The sealing ring 402 is fixed in the mating groove of the valve seat 401 and the sealing ring holder 403 and extends beyond the end face of the valve seat 401 and the sealing ring holder 403.

[0046] When the ball 2 is closed, the valve seat 401 and the sealing ring 402 abut against the ball seat 3.

[0047] The outlet side groove of the valve body 1 forms a first step 5 which mates with the sealing ring holder 403 and the valve seat 401 respectively.

[0048] When the ball 2 is in the closed position, the valve seat 401 leaves a gap 16 of 2-3 mm with the first step 5 in the outlet side groove of the valve body 1, and the valve seat support 404 leaves a gap 17 of 5-7 mm with the pressure ring 9. The ball seat 3 and the valve seat assembly 4 form a soft and hard double sealing structure. The cross section of the sealing ring 402 is triangular, and the material is high-hardness explosion-proof fluorine rubber with a hardness of HSA 95-98°. The valve seat 401 and the ball seat 3 are made of stainless steel and have hard alloy on the surface.

[0049] Working principle:

[0050] The ball seat 3 and the sealing ring 402 form the first sealing structure, which is a soft sealing structure. The compression spring 8 provides a pre-tightening force on the back of the valve seat assembly 4, providing the initial sealing specific pressure of the sealing ring 402 and the ball seat 3, thereby ensuring the low-pressure sealing performance. The ball seat 3 and the valve seat 401 form the second sealing structure, which is a hard sealing structure, capable of reducing the contact stress between the rubber sealing ring and the ball seat under high pressure, preventing the rubber sealing ring from being crushed or rapidly worn out due to excessive contact stress.

[0051] As shown in the figure, when the pressure is positive, the medium pressure enters the back of the valve seat 4. Because the area S2 on the front of the valve seat assembly 4 is smaller than the water pressure area S1 on the back, under the action of the pressure difference F=P*(S1-S2), the medium pressure forces the valve seat 401 to tightly press the sealing surface of the ball seat 3. The greater the water pressure, the better the high-pressure sealing performance. Figure 2 As shown in the figure, when the pressure is positive, the medium pressure enters the back of the valve seat 4. Because the area S2 on the front of the valve seat assembly 4 is smaller than the water pressure area S1 on the back, under the action of the pressure difference F=P*(S1-S2), the medium pressure forces the valve seat 401 to tightly press the sealing surface of the ball seat 3. The greater the water pressure, the better the high-pressure sealing performance.

[0052] Figure 3 ​As shown, when in reverse pressure, the medium pressure enters the back of the valve seat support 404, and the water pressure acting on the front of the valve seat assembly 4 has an area S4 smaller than the water pressure area S3 of the back of the valve seat support 404. Under the combined action of the pressure difference F=P*(S3-S4) and the compression spring 8, the valve seat 401 is pressed against the sealing surface of the ball seat 3. The greater the water pressure, the better the high-pressure sealing performance. Therefore, whether it is forward sealing or reverse sealing, good sealing effect can be achieved.

[0053] As a preferred embodiment, the present embodiment is applied in raw water conditions. If there is no anti-silt structure, the silt particles in the medium will deposit into the gap Ⅱ7 groove between the valve seat assembly 4 and the compression ring 8, hindering the normal activity of the valve seat assembly 4 and affecting the sealing reliability of the valve.

[0054] The present scheme is provided with a mudguard 10 inside the valve seat support 404. In the present embodiment, the mudguard 10 is made of a 1mm thick stainless steel plate rolled into a cylindrical shape and fixed inside the valve seat support 404 by a circle of argon arc welding 11 and spot welding, and extends to the inside of the compression ring 9. In this way, silt particles will not enter the gap Ⅱ7 groove, ensuring the normal operation of the valve seat assembly 4 and the sealing reliability of the valve.

[0055] The above describes the preferred embodiments of the present application in detail. It should be understood that those skilled in the art can make many modifications and changes to the present application without creative labor according to the concept of the present application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment based on the existing technology according to the concept of the present application shall be within the protection scope defined by the claims.

Claims

1. A bidirectional pressure-containing seal structure of a high-pressure valve, characterized by, The valve body (1), the ball (2), the ball seat (3), the valve seat assembly (4), the compression ring (9) and the compression spring (8) are included. The ball (2) is a barrel-shaped eccentric structure and is installed in the valve body (1) by rotating the valve stem. The ball seat (3) is a ring-shaped structure and is fixed on the ball (2). The valve seat assembly (4) is arranged in the outlet side groove of the valve body (1) and is connected with the compression ring (9) by the compression spring (8). The compression ring (9) is fixed on the outlet side of the valve body (1).

2. The bidirectional pressure-containing seal structure of a high-pressure valve according to claim 1, characterized by The valve seat assembly (4) includes a valve seat (401), a sealing ring (402), a sealing ring holder (403) and a valve seat support (404), the sealing ring holder (403) is fixedly connected with the valve seat (401), the valve seat (401) is sleeved in the valve seat support (404) and can move axially, the valve seat support (404) is axially movably connected with the compression ring (9) by the compression spring (8), and the sealing ring (402) is fixed in the matching groove of the valve seat (401) and the sealing ring holder (403) and extends out of the end surface of the valve seat (401) and the sealing ring holder (403). When the ball (2) is closed, the valve seat (401) and the sealing ring (402) abut against the ball seat (3).

3. The bidirectional pressure-containing seal structure of a high-pressure valve according to claim 2, characterized by The outlet side groove of the valve body (1) forms a first step (5) matched with the sealing ring holder (403) and the valve seat (401) respectively. When the ball (2) is in the closed position, a gap I (6) is formed between the valve seat (401) and the first step (5) of the outlet side groove of the valve body (1), and a gap II (7) is formed between the valve seat assembly (4) and the compression ring (9).

4. The bidirectional pressure-containing seal structure of a high-pressure valve according to claim 3, characterized by The gap I (6) is within the range of 2-3 mm, and the gap II (7) is within the range of 5-7 mm.

5. The bidirectional pressure-containing seal structure of a high-pressure valve according to claim 2, characterized by The cross section of the sealing ring (402) is triangular, and the material is high-hardness explosion-proof fluorine rubber with a hardness within the range of HSA 95-98°.

6. The bidirectional pressure-containing seal structure of a high-pressure valve according to claim 2, wherein The valve seat (401) and the ball seat (3) are made of stainless steel and have hard alloy on the surface.

7. The bidirectional pressure-containing seal structure of a high-pressure valve according to claim 2, characterized by The valve seat support (404) is provided with a plurality of O-shaped sealing rings and forms a seal with the valve seat (401) and the valve body (1) respectively.

8. The bidirectional pressure-containing seal structure of a high-pressure valve according to claim 2, characterized by The inner side of the valve seat support (404) is provided with a mudguard (10) which is welded and fixed in the inner side of the valve seat support (404) and extends to the inner side of the compression ring (9).

9. The bidirectional pressure-containing seal structure of a high-pressure valve according to claim 1, wherein The compression ring (9) is provided with a cylindrical groove for mounting the compression spring (8).

10. The bidirectional pressure-containing seal structure of a high-pressure valve according to claim 1, characterized by, The sealing surface of the ball seat (3) is spherical, and the ball seat (3) forms a seal with the ball (2) through an O-shaped ring.

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