Double two-way sealing structure of valve seat and valve body and ball valve applying double two-way sealing structure

Abstract

The utility model relates to the technical field of valve bodies, in particular to a double two-way sealing structure of a valve seat and a valve body and a ball valve applying the double two-way sealing structure, the valve seat comprises a first sealing face used for being sealed with the valve body, the first sealing face is provided with at least two sealing grooves distributed at intervals, and a sealing ring is installed in each sealing groove. At least one boss is formed between the at least two sealing grooves, and the boss is provided with a convex face which is arranged in a protruding mode so as to be in mirror face sealing with the valve body sealing face; two-way sealing in front of and behind the valve is achieved through the sealing rings located on the two sides of the convex face, meanwhile, double sealing between the valve body and the valve seat is achieved through mirror face contact of the convex face and the sealing face of the valve body, and the sealing effect between the valve seat and the valve body is improved.

Description

Technical Field

[0001] This utility model relates to the field of valve body technology, and in particular to a double bidirectional sealing structure of valve seat and valve body and a ball valve using the same. Background Technology

[0002] Chinese patent application CN202021333034.X discloses a soft-seal floating ball valve seat and a ball valve including the same. The valve seat body includes a first abutment end for contacting and abutting against a ball core. The first abutment end has a first lip and a second lip, both of which extend outwards and protrude for contacting and abutting against the ball core. The valve seat body also includes a second abutment end for contacting and abutting against a valve body. In this design, the valve seat is made of a soft material, resulting in a soft seal between the valve seat, the ball core, and the valve body. The sealing structure between the valve seat and the valve body is simple and cannot meet the requirements of high-pressure conditions. Utility Model Content

[0003] The technical problem to be solved by this utility model is that, in order to solve the problem that in the prior art, the valve seat is made of soft material and the seal between it, the ball core and the valve body is soft, and the sealing structure between the valve seat and the valve body is simple and cannot meet the requirements of high pressure conditions, a double bidirectional sealing structure for the valve seat and the valve body and a ball valve using the same structure are provided.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a double bidirectional sealing structure for valve seat and valve body, wherein the valve seat includes a first sealing surface for sealing with the valve body, the first sealing surface has at least two spaced sealing grooves, each sealing groove is equipped with a sealing ring, and at least one boss is formed between the at least two sealing grooves, the boss having a convex surface that is protruding to mirror seal with the sealing surface of the valve body.

[0005] Furthermore, the sealing ring includes a metal open ring and a spring located inside the metal open ring and applying a continuous elastic force to it.

[0006] Furthermore, the openings of the metal open rings of at least two of the sealing rings located on both sides face away from each other.

[0007] Furthermore, at least two sealing grooves have an outer connecting wall formed between the outer sealing groove wall and the outer peripheral wall of the valve seat, and an inner connecting wall formed between the inner sealing groove wall and the inner peripheral wall of the valve seat. When the convex surface contacts the valve body sealing surface, a gap H is left between the outer connecting wall and the inner connecting wall and the valve body sealing surface.

[0008] Furthermore, the inner side of the valve seat is recessed to form a tool groove for a disassembly tool to enter and remove the valve seat from the valve body.

[0009] Furthermore, the outer peripheral wall of the valve seat is provided with a guide slope.

[0010] Furthermore, the valve seat also includes a second sealing surface for mirror sealing with the valve core.

[0011] A ball valve comprising the aforementioned dual bidirectional sealing structure of valve seat and valve body.

[0012] The beneficial effects of this utility model are as follows: This utility model utilizes sealing rings located on both sides of the convex surface to achieve bidirectional sealing before and after the valve, and at the same time, it combines the mirror contact between the convex surface and the valve body sealing surface to achieve double sealing between the valve body and the valve seat, thereby improving the sealing effect between the valve seat and the valve body. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0015] Figure 2 yes Figure 1 A magnified view of part A in the middle;

[0016] In the picture:

[0017] 1. Valve seat; 1a. First sealing surface; 1b. Second sealing surface; 101. Sealing groove; 102. Boss; 1021. Raised surface; 103. Outer connecting wall; 104. Inner connecting wall; 105. Tool groove; 106. Guide slope;

[0018] 2. Valve body;

[0019] 3. Sealing ring; 301. Metal open ring; 302. Spring;

[0020] 4. Valve core;

[0021] 5. Valve stem. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components relevant to the present invention. Orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0023] like Figure 1 and Figure 2As shown, a double bidirectional sealing structure of valve seat and valve body is provided. Valve seat 1 is located in the valve cavity of valve body 2 and fixed between valve body 2 and valve core 4. It is used to cooperate with valve core 4 to connect or block the liquid inlet flow channel and the liquid outlet flow channel. One side of valve seat 1 is used to seal with valve body 2 and the other side is used to seal with valve core 4.

[0024] The valve seat 1 includes a first sealing surface 1a for sealing with the valve body 2. The first sealing surface 1a has a recessed opening to form at least two spaced sealing grooves 101. Each sealing groove 101 is equipped with a sealing ring 3. At least one boss 102 is formed between the at least two sealing grooves 101. The boss 102 has a convex surface 1021 that is protruding to provide a mirror seal with the sealing surface of the valve body 2. The contact area between the convex surface 1021 and the sealing surface of the valve body 2 is hardened and ground to achieve full mirror contact. This sealing method effectively reduces the damage to the sealing surface caused by small particulate impurities in the fluid, greatly reducing maintenance costs. Moreover, the sealing area of ​​the convex surface 1021 is large. Even if discontinuous through-damage occurs, the valve seat 1 can be repaired and continued to be used, thereby achieving the goal of cost reduction.

[0025] When the valve is closed, the valve core 4 presses against the valve seat 1. The sealing ring 3 located inside the convex surface 1021 is used to intercept the medium entering along the first direction (the direction of the liquid inlet or outlet flow into the valve cavity) and seal that direction. The sealing ring 3 located outside the convex surface 1021 is used to intercept the medium entering along the second direction opposite to the first direction (the direction of the liquid inlet or outlet flow into the valve cavity) and seal that direction, thus achieving bidirectional sealing. In addition, the mirror seal between the convex surface 1021 in the middle and the sealing surface of the valve body 2 achieves double sealing, thereby improving the sealing effect between the valve seat 1 and the valve body 2.

[0026] In some examples, the sealing ring 3 includes a metal open ring 301 and a spring 302 located within the metal open ring 301 and applying a continuous elastic force to it. The metal open ring 301 can generally be a C-shaped structure. When the valve is closed, the valve core 4 presses against the valve seat 1, and the metal open ring 301 in the sealing groove 101 is compressed, causing the spring 302 to be compressed synchronously. The spring 302 is supported inside the metal open ring 301 so that it is in close contact with the valve body 2 to achieve a seal. Furthermore, by setting a reasonable amount of compression, the boss 102 contacts the sealing surface of the valve body 2 while the sealing ring 3 is compressed, thereby achieving a double seal.

[0027] In some examples, the openings of the metal open rings 301 of the two sealing rings 3 located on both sides of the valve are respectively oriented towards the side opposite to each other. That is, the sealing ring 3 located on the outer side is the outer sealing ring 3, and its metal open ring 301 opening is the outer opening. When the pressure in front of the valve (valve cavity) is high, the pressure enters the interior of the outer sealing ring 3 from the outer opening, expanding the outer sealing ring 3 (the outer sealing ring 3 undergoes slight deformation) to achieve sealing in this direction. The sealing ring 3 located on the inner side is the inner sealing ring 3, and its metal open ring 301 opening is the inner opening. When the pressure in the rear of the valve (inlet or outlet flow channel) is high, the pressure enters the interior of the inner sealing ring 3 from the inner opening, expanding the inner sealing ring 3 (the inner sealing ring 3 undergoes slight deformation) to achieve sealing in this direction.

[0028] In some examples, at least two sealing grooves 101 are connected to the outer wall of the sealing groove 101 to form an outer connecting wall 103, and the inner wall of the sealing groove 101 is connected to the inner wall of the valve seat 1 to form an inner connecting wall 104. Both the outer connecting wall 103 and the inner connecting wall 104 have gaps between them and the sealing surface of the valve body 2, that is, the convex surface 1021 protrudes from the outer connecting wall 103 and the inner connecting wall 104. When the valve is closed, the valve core 4 squeezes the valve seat 1, so that the convex surface 1021 contacts the sealing surface of the valve body 2 to achieve a mirror seal. At this time, the sealing ring 3 can intercept the medium entering from the gap to achieve a double seal.

[0029] In some examples, the inner side of the valve seat 1 is recessed to form a tool groove 105 for a disassembly tool to enter and remove the valve seat 1 from the valve body 2. The cross-section of the tool groove 105 can be, but is not limited to, arc-shaped or rectangular shapes. To improve the fit with the disassembly tool, the tool groove 105 is preferably rectangular. When the medium contains dust or particulate matter, this medium will fill the gap between the valve seat 1 and the valve body 2, making it difficult to remove the valve seat 1 and increasing maintenance difficulties. In this case, the valve seat 1 can be removed by tapping the groove wall with a tool, or by using hydraulic tools to push or pull out the valve seat 1 with the help of the groove wall.

[0030] In some examples, the outer peripheral wall of the valve seat 1 is provided with a guide slope 106 to guide the valve seat 1 into the valve body 2, making it easier to install the valve seat 1.

[0031] In some examples, the valve seat 1 also includes a second sealing surface 1b for mirror sealing with the valve core 4. The contact area between the second sealing surface 1b and the valve core 4 is hardened and ground to mirror contact, which can avoid the difficulty of valve core 4 turning caused by soft sealing. Moreover, this sealing method can greatly reduce the damage to the sealing surface caused by particulate impurities in the medium and reduce maintenance costs.

[0032] In some examples, a ball valve includes a double bidirectional sealing structure of the valve seat 1 and the valve body 2, wherein the valve body 2 has a valve core 4 and a valve stem 5 disposed in the valve cavity, and the valve core 4 includes two ball petals that are hinged at the bottom and can close or open during the raising and lowering of the valve stem 2.

[0033] Working principle:

[0034] When the valve is closed, the valve core 4 presses against the valve seat 1, and the metal open ring 301 in the sealing groove 101 is compressed, causing the spring 302 to be compressed synchronously. The spring 302 is supported inside the metal open ring 301, making it in close contact with the valve body 2 to achieve a seal. When the pressure before the valve is high, the pressure enters the interior of the outer sealing ring 3 from the outer opening, opening the outer sealing ring 3 to achieve a seal in this direction. When the pressure after the valve is high, the pressure enters the interior of the inner sealing ring 3 from the inner opening, opening the inner sealing ring 3 to achieve a seal in this direction, thus achieving a bidirectional seal. At the same time, the convex surface 1021 and the sealing surface of the valve body 2 are mirror-sealed to achieve a double seal, improving the sealing effect between the valve seat 1 and the valve body 2.

[0035] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A double bidirectional sealing structure for both valve seat and valve body, characterized in that: The valve seat (1) includes a first sealing surface (1a) for sealing with the valve body (2). The first sealing surface (1a) is recessed to form at least two spaced sealing grooves (101). A sealing ring (3) is installed in each sealing groove (101). At least one boss (102) is formed between the at least two sealing grooves (101). The boss (102) has a convex surface (1021) that is protruding to mirror seal with the sealing surface of the valve body (2).

2. The double bidirectional sealing structure of valve seat and valve body according to claim 1, characterized in that: The sealing ring (3) includes a metal open ring (301) and a spring (302) located inside the metal open ring (301) and applying a continuous elastic force to it.

3. The double bidirectional sealing structure of valve seat and valve body according to claim 2, characterized in that: The openings of the metal open rings (301) of the two seals (3) located on both sides of the at least two seals (3) are respectively facing the side away from each other.

4. The double bidirectional sealing structure of valve seat and valve body according to claim 2, characterized in that: At least two sealing grooves (101) have an outer connecting wall (103) formed between the outer sealing groove (101) wall and the outer peripheral wall of the valve seat (1), and an inner connecting wall (104) formed between the inner sealing groove (101) wall and the inner peripheral wall of the valve seat (1). When the convex surface (1021) contacts the sealing surface of the valve body (2), there is a gap between the outer connecting wall (103) and the inner connecting wall (104) and the sealing surface of the valve body (2).

5. The double bidirectional sealing structure of valve seat and valve body according to claim 1, characterized in that: The valve seat (1) has a recessed groove (105) on its inner side for a disassembly tool to enter and remove the valve seat (1) from the valve body (2).

6. The double bidirectional sealing structure of valve seat and valve body according to claim 1, characterized in that: The outer peripheral wall of the valve seat (1) is provided with a guide slope (106).

7. The double bidirectional sealing structure of valve seat and valve body according to claim 1, characterized in that: The valve seat (1) also includes a second sealing surface (1b) for mirror sealing with the valve core (4).

8. A ball valve, characterized in that, Includes a double bidirectional sealing structure for the valve seat and valve body as described in any one of claims 1-7.

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