A valve seat of a bidirectional zero-leakage isolation valve and a welding tool of the valve seat

Abstract

The utility model belongs to the technical field of isolating valve, concretely relates to a valve seat of bidirectional zero leakage isolating valve and welding tool of valve seat, the valve seat is board -like structure, is opened with multiple hollows of flat round type on the valve seat, the valve seat includes the arc section of bilateral symmetry and is located between the connecting portion of strip -shaped arc section two sides, the arc section is board -like structure, is provided with a plurality of C type grooves on the arc section interval along the length direction, the connecting portion is provided with a plurality of groups, and the both ends of connecting portion are respectively welded with the flange end portion of C type groove of two side arc sections, and the C type groove of connecting portion two sides is buckled with the help of connecting portion and forms the hollow of flat round type. The valve seat in the utility model adopts a plurality of components to be welded, and the rectangular portion of the inner cavity of the valve seat formed by the method is surrounded by a plurality of strip-shaped connecting portions, the forming of the rectangular portion avoids the large area blanking waste of the whole steel plate, and the production cost of the valve is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of isolation valve technology, specifically relating to a valve seat of a bidirectional zero-leakage isolation valve and a welding fixture for the valve seat. Background Technology

[0002] Isolation valves are the most critical valves in the nuclear island ventilation isolation system and the last physical barrier to prevent the leakage of radioactive materials. In the event of a serious nuclear safety leak or emergency, they enable rapid isolation by cutting off and separating the airflow on both sides of the valve, controlling the nuclear contamination source inside, effectively preventing the leakage of radioactive materials, and ensuring the safety of personnel and the environment.

[0003] The invention patent application with publication number "CN 117469408 A" discloses "a bidirectional zero-leakage isolation valve". This isolation valve can achieve zero leakage of the valve seat under bidirectional airflow by the cooperation between the irregular valve seat, sealing ring and irregular blade.

[0004] Current irregular valve seats are integral structures, usually made from a single piece of steel plate. Multiple flat oval cavities with rounded ends and rectangular middle sections are formed by directly cutting material from the steel plate. However, this forming method results in a large proportion of steel plate material being cut, and the waste material cannot be used for other machining processes, causing significant waste of raw materials and increasing the cost of valves. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a valve seat for a bidirectional zero-leakage isolation valve and a welding fixture for the valve seat. The valve seat is welded from multiple components. The rectangular portion of the valve seat formed by this method is surrounded by several strip-shaped connecting parts. The forming of the rectangular portion avoids large-area waste from cutting a whole steel plate, thus reducing the production cost of the valve.

[0006] The specific technical solution adopted in this utility model is as follows:

[0007] A valve seat for a bidirectional zero-leakage isolation valve, the valve seat having a plate-like structure and multiple flat-oval cavities, the valve seat including symmetrically arranged arc-shaped portions on both sides and a strip-shaped connecting portion located between the two arc-shaped portions, the arc-shaped portions having a plate-like structure, multiple C-shaped grooves spaced along the length direction on the arc-shaped portions, the connecting portion having multiple sets, the two ends of the connecting portion being welded to the flange ends of the C-shaped grooves of the two arc-shaped portions respectively, the C-shaped grooves of the two connecting portions being fastened together by the connecting portion to form a flat-oval cavity.

[0008] The connecting part includes a side connecting part and a middle connecting part. The side connecting part is welded to the flange end of the C-shaped groove located on the side of the valve seat, and the middle connecting part is welded to the flange end of the C-shaped groove located on the inner side of the valve seat.

[0009] Both ends of the side connection are provided with wedge-shaped welding chamfers, and both ends of the middle connection are provided with "Λ"-shaped welding protrusions.

[0010] The two ends of the opening side of the C-shaped groove extend outward in a direction parallel to the connecting part and form an extension part, and the far end of the extension part forms the flange end of the C-shaped groove.

[0011] A welding fixture for the valve seat of a bidirectional zero-leakage isolation valve, the welding fixture including a base and a side bracket and an intermediate bracket fixed on the base, the side bracket clamping and fixing an arc-shaped part, and the intermediate bracket clamping and fixing a connecting part.

[0012] The side support and the middle support are respectively provided with a side height limiting block and a middle height limiting block. The side height limiting block prevents the arc-shaped part from abutting against the base, and the middle height limiting block prevents the connecting part from abutting against the base.

[0013] The intermediate support includes two sets of symmetrically arranged clamping columns, which are located on both sides of the connecting part and clamp and fix the connecting part.

[0014] The side brackets are symmetrically arranged on both sides of the valve seat and respectively clamp the arc-shaped parts on both sides of the connecting part. The side brackets include a plate-shaped first limiting plate and a column-shaped first limiting post. The cross-section of the first limiting post is a "D"-shaped structure. The arc-shaped side of the first limiting post fits into the C-shaped groove of the arc-shaped part. The first limiting plate and the first limiting post together clamp the bottom sides of the C-shaped groove.

[0015] The side support includes a plate-shaped second limiting plate and two sets of symmetrically arranged second limiting posts. The second limiting plate is located near the bottom of the C-shaped groove and abuts against the planar side of the arc-shaped part. The two sets of second limiting posts are located on both sides of the flange end of the C-shaped groove and clamp the flange end of the C-shaped groove.

[0016] The beneficial effects of this utility model are:

[0017] 1. The valve seat in this invention is welded from multiple components. When manufacturing the valve seat, several steel plates are first prepared to create the arc-shaped portion and connecting portion. When preparing the arc-shaped portion, multiple C-shaped grooves are cut along one side of the steel plate and the material is cut. When preparing the connecting portion, the steel plate is divided into multiple rectangular strip structures, each of which is a connecting portion. Finally, the connecting portions are welded to the arc-shaped portions on both sides to form a valve seat with multiple flat, round inner cavities. The valve seat formed by this method has a rectangular inner cavity surrounded by several strip-shaped connecting portions. The forming of the rectangular portion avoids large-area waste from cutting a single piece of steel plate, thus reducing the production cost of the valve.

[0018] 2. In order to ensure the welding accuracy between the arc-shaped part and the connecting part of the valve seat during welding, this utility model also provides a welding fixture for fixing. The welding fixture clamps each component through the side bracket and the middle bracket to ensure that the relative position of the arc-shaped part and the connecting part remains unchanged during welding, avoids the displacement caused by manual handling, and ensures the welding accuracy of the valve seat and the shape accuracy of the inner cavity. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the valve seat structure;

[0020] Figure 2 This is a schematic diagram of the arc-shaped section;

[0021] Figure 3 This is a schematic diagram of the side connection part;

[0022] Figure 4 This is a schematic diagram of the intermediate connecting part;

[0023] Figure 5 This is a schematic diagram of the welding fixture in specific embodiment 1;

[0024] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure along the AA direction;

[0025] Figure 7 for Figure 5 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0026] Figure 8 This is a schematic diagram of the welding fixture in specific embodiment 2;

[0027] In the attached diagram, 1 is the arc-shaped part, 2 is the C-shaped groove, 3 is the side connection part, 4 is the middle connection part, 5 is the welding chamfer, 6 is the welding protrusion, 7 is the extension part, 8 is the base, 9 is the side height limiting block, 10 is the middle height limiting block, 11 is the clamping post, 12 is the first limiting plate, 13 is the first limiting post, 14 is the second limiting plate, and 15 is the second limiting post. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0029] A valve seat for a bidirectional zero-leakage isolation valve, such as Figure 1-4As shown, the valve seat has a plate-like structure with multiple flat oval cavities. The valve seat includes symmetrically arranged arc-shaped parts 1 on both sides and a strip-shaped connecting part located between the two arc-shaped parts 1. The arc-shaped parts 1 have a plate-like structure and multiple C-shaped grooves 2 are spaced apart along the length direction on the arc-shaped parts 1. Multiple sets of connecting parts are provided. The two ends of the connecting parts are welded to the flange ends of the C-shaped grooves 2 of the arc-shaped parts 1 on both sides. The C-shaped grooves 2 of the connecting parts on both sides are fastened together by the connecting parts to form flat oval cavities.

[0030] Current irregular valve seats are integral structures, usually made from a single piece of steel plate. Multiple flat oval cavities with rounded ends and rectangular middle sections are formed by directly cutting material from the steel plate. However, this forming method results in a large proportion of steel plate material being cut, and the waste material cannot be used for other machining processes, causing significant waste of raw materials and increasing the cost of valves.

[0031] Therefore, the valve seat in this invention is welded from multiple components. When manufacturing the valve seat, several steel plates are first prepared to form the arc-shaped part 1 and the connecting part. When preparing the arc-shaped part 1, as follows... Figure 2 As shown, multiple C-shaped grooves 2 are cut along one side of the steel plate and the material is cut. When preparing the connecting part, as follows: Figure 3-4 As shown, the steel plate is divided into multiple rectangular strip structures, each of which serves as a connecting part. Finally, as shown... Figure 1 As shown, a valve seat with multiple flat, round inner cavities can be formed by welding the connecting part to the arc-shaped parts 1 on both sides. In this method, the rectangular portion of the inner cavity of the valve seat is surrounded by the connecting part. The forming of the rectangular portion avoids large-area waste from cutting a single piece of steel plate, thus reducing the production cost of the valve.

[0032] like Figure 1 and Figure 3-4 As shown, the connecting portion includes a side connecting portion 3 and a middle connecting portion 4. The side connecting portion 3 is welded to the flange end of the C-shaped groove 2 located on the side of the valve seat, and the middle connecting portion 4 is welded to the flange end of the C-shaped groove 2 located on the inner side of the valve seat. The width of the middle connecting portion 4 is twice the width of the side connecting portion 3. Similarly, the flange width of the C-shaped groove 2 located on the inner side of the valve seat is also twice the flange width of the C-shaped groove 2 located on the side of the valve seat. This is because the valve seat is also surrounded by a valve body to form protection. The valve body can support the edge side of the valve seat and improve its structural strength. Therefore, in order to save materials, the edge side of the valve body can be narrower, ensuring that the width of the connecting portion and its corresponding flange end of the C-shaped groove 2 are equal.

[0033] like Figure 3-4 As shown, the two ends of the side connecting part 3 are respectively provided with wedge-shaped welding chamfers 5, and the two ends of the middle connecting part 4 are respectively provided with welding protrusions 6 in the shape of "Λ".

[0034] Since the valve needs to form a seal through the fit between the blade and the inner cavity, it is necessary to ensure the shape accuracy of the inner cavity, that is, to ensure the connection accuracy and connection firmness between the arc-shaped part 1 and the connecting part. Both the welding chamfer 5 and the welding protrusion 6 can expand the welding contact area, guide the welding material to fill evenly, reduce defects such as porosity and lack of fusion, and improve the connection reliability between the connecting part and the arc-shaped part 1.

[0035] Since the side connection part 3 is narrow and supported by the valve body, its end is a simple wedge-shaped welded chamfer 5. The middle connection part 4 is wider and has a more ample area for setting more complex connectors. Therefore, its end is a "Λ"-shaped welded protrusion 6 composed of two back-to-back chamfers. The "Λ"-shaped welded protrusion 6 can better increase the interlocking degree and connection firmness between the middle connection part 4 and the arc-shaped part 1.

[0036] like Figure 1-2 As shown, the two ends of the opening side of the C-shaped groove 2 extend outward in a direction parallel to the connecting part and form extensions 7. The distal end of the extension 7 forms the flange end of the C-shaped groove 2. The extension 7 is 50 mm long.

[0037] The extension 7 ensures the smoothness of the junction between the arc surface and the flat surface of the inner cavity. Without the extension 7, the welding point would be the junction between the arc surface and the flat surface of the inner cavity. Since the welding point is located on an arc surface, during grinding and polishing, the C-groove 2 of the arc part 1 is easily partially ground, affecting the arc accuracy of the C-groove 2. This would cause the blade to fail to fit tightly against the junction when rotating, resulting in leakage. Therefore, the extension 7 is provided to keep the welding point away from the arc surface side, with both sides of the welding point being flat. This facilitates subsequent grinding of the welding point, ensuring grinding accuracy and thus guaranteeing the smoothness of the junction between the arc surface and the flat surface of the inner cavity. This improves the sealing effect between the blade and the valve seat. At the same time, the extension 7 also facilitates the subsequent alignment of the weld seam between the arc part 1 and the connecting part with the welding fixture.

[0038] like Figure 5-7 As shown, this utility model also provides a welding fixture for the valve seat of a bidirectional zero-leakage isolation valve. In specific embodiment 1, the welding fixture includes a base 8 and a side bracket and an intermediate bracket fixed on the base 8. The side bracket clamps and fixes the arc-shaped part 1, and the intermediate bracket clamps and fixes the connecting part.

[0039] To ensure the welding accuracy between the arc-shaped part 1 and the connecting part during the welding of the valve seat, this utility model also provides a welding fixture for fixing. The welding fixture clamps each component through the side bracket and the middle bracket to ensure that the relative position of the arc-shaped part 1 and the connecting part remains unchanged during welding, avoiding the displacement caused by manual handling, and ensuring the welding accuracy of the valve seat and the shape accuracy of the inner cavity.

[0040] like Figure 6-7 As shown, the side support and the middle support are respectively equipped with a side height limiting block 9 and a middle height limiting block 10. The side height limiting block 9 prevents the arc-shaped part 1 from abutting against the base 8, and the middle height limiting block 10 prevents the connecting part from abutting against the base 8. The height limiting blocks ensure that there is a certain distance between the arc-shaped part 1 or the connecting part and the base 8, leaving space for welding operations, preventing the base 8 from obstructing the movement of the welding torch, and preventing welding of the arc-shaped part 1 or the connecting part to the base 8. In addition, the side height limiting block 9 and the middle height limiting block 10 are at the same height, ensuring that the arc-shaped part 1 and the connecting part are coplanar.

[0041] like Figure 6 As shown, the intermediate support includes two sets of symmetrically arranged clamping columns 11. These two sets of clamping columns 11 are located on both sides of the connecting part and clamp and fix it in place. The two sets of symmetrically arranged clamping columns 11 form a clamp-like structure and clamp and fix the connecting part, preventing displacement of the connecting part in the front-to-back direction. The intermediate support has a simple structure, can be quickly assembled and disassembled, and improves the efficiency of tooling use. Multiple sets of intermediate supports are provided on the base 8 at positions corresponding to each connecting part. Each connecting part is clamped by at least two sets of intermediate supports to ensure that the connecting part remains horizontal.

[0042] Other examples Figure 6 As shown, a bevel is provided on the inner top of the clamping post 11 near the connecting part, and the middle bracket is formed into a funnel-shaped opening side by means of this bevel. In order to ensure the clamping firmness, the gap between the connecting part and the two sets of clamping posts 11 is the same width, which makes it difficult for the connecting part to be inserted into the gap. Therefore, the opening side of the middle bracket is set as a funnel-shaped structure.

[0043] like Figure 7 As shown, the side brackets are symmetrically arranged on both sides of the valve seat and respectively clamp the arc-shaped portions 1 on both sides of the connecting part. The side brackets include a plate-shaped first limiting plate 12 and a column-shaped first limiting post 13. The cross-section of the first limiting post 13 is a "D"-shaped structure. The arc surface of the first limiting post 13 fits into the C-shaped groove 2 of the arc-shaped portion 1. The first limiting plate 12 and the first limiting post 13 together clamp the bottom sides of the C-shaped groove 2. The arc surface of the "D"-shaped first limiting post 13 fits into the arc surface of the C-shaped groove 2, which can accurately fix the curved contour of the arc-shaped portion 1 and clamp and fix it from both sides of the arc-shaped portion 1 to ensure the clamping firmness of the arc-shaped portion 1.

[0044] Specific embodiment 2 is as follows Figure 8 As shown, the difference between specific embodiment 2 and specific embodiment 1 is only in the structure of the side support. The side support includes a plate-shaped second limiting plate 14 and two sets of symmetrically arranged second limiting posts 15. The second limiting plate 14 is located near the bottom of the C-shaped groove 2 and abuts against the plane side of the arc-shaped part 1. The two sets of second limiting posts 15 are located on both sides of the flange end of the C-shaped groove 2 and clamp the flange end of the C-shaped groove 2.

[0045] In the manufacturing of the side bracket of specific embodiment 1, it is necessary to accurately design the relative positions of the first limiting post 13 and the clamping post 11 to ensure that after the tooling clamps the arc-shaped part 1 and the connecting part, the extension 7 of the arc-shaped part 1 and the connecting part are located on the same straight line. This makes the manufacturing of the side bracket of specific embodiment 1 more difficult.

[0046] However, in the manufacturing of the side bracket in specific embodiment 2, it is only necessary to ensure that the second limiting post 15 and the clamping post 11 are on the same straight line, such as... Figure 8 As shown, this ensures that the extension 7 of the arc-shaped part 1 and the connecting part are on the same straight line, reducing the manufacturing difficulty of the side bracket.

[0047] Meanwhile, in specific embodiment 2, the clamping point of the side bracket is closer to the welding point of the arc-shaped part 1, which plays a supporting and strengthening role in the area of ​​the arc-shaped part 1 near the welding point, preventing the welding area of ​​the arc-shaped part 1 from being displaced due to excessive pressure during welding.

[0048] In another specific embodiment 2, the second limiting plate 14 and the second limiting post 15 are both provided with side height limiting blocks 9. The side height limiting blocks 9 are at the same height as the middle height limiting block 10, ensuring that the arc-shaped part 1 is horizontal and coplanar with the connecting part.

Claims

1. A valve seat for a bidirectional zero-leakage isolation valve, the valve seat having a plate-like structure and having multiple flat, round cavities, characterized in that, The valve seat includes two symmetrically arranged arc-shaped parts (1) and a strip-shaped connecting part located between the two arc-shaped parts (1). The arc-shaped parts (1) have a plate-like structure and multiple C-shaped grooves (2) are spaced along the length direction on the arc-shaped parts (1). The connecting part is provided in multiple sets. The two ends of the connecting part are welded to the flange ends of the C-shaped grooves (2) of the two arc-shaped parts (1) respectively. The C-shaped grooves (2) of the connecting parts on both sides are fastened together by the connecting part to form a flat round cavity.

2. The valve seat of the bidirectional zero-leakage isolation valve according to claim 1, characterized in that, The connecting part includes a side connecting part (3) and a middle connecting part (4). The side connecting part (3) is welded to the flange end of the C-shaped groove (2) located on the side of the valve seat, and the middle connecting part (4) is welded to the flange end of the C-shaped groove (2) located on the inner side of the valve seat.

3. The valve seat of the bidirectional zero-leakage isolation valve according to claim 2, characterized in that, The two ends of the side connection part (3) are respectively provided with wedge-shaped welding chamfers (5), and the two ends of the middle connection part (4) are respectively provided with welding protrusions in the shape of "Λ" (6).

4. The valve seat of the bidirectional zero-leakage isolation valve according to claim 1, characterized in that, The two ends of the opening side of the C-groove (2) extend outward in a direction parallel to the connecting part and form an extension (7), and the far end of the extension (7) forms the flange end of the C-groove (2).

5. A welding fixture for the valve seat of a bidirectional zero-leakage isolation valve, the welding fixture being used to fix the valve seat of the bidirectional zero-leakage isolation valve as described in claim 1, characterized in that, The welding fixture includes a base (8) and a side bracket and a middle bracket fixed on the base (8). The side bracket clamps and fixes the arc-shaped part (1), and the middle bracket clamps and fixes the connecting part.

6. The welding fixture for the valve seat of a bidirectional zero-leakage isolation valve according to claim 5, characterized in that, The side support and the middle support are respectively provided with a side height limiting block (9) and a middle height limiting block (10). The side height limiting block (9) prevents the arc-shaped part (1) from abutting against the base (8), and the middle height limiting block (10) prevents the connecting part from abutting against the base (8).

7. The welding fixture for the valve seat of a bidirectional zero-leakage isolation valve according to claim 5, characterized in that, The intermediate support includes two sets of symmetrically arranged clamping columns (11), which are located on both sides of the connecting part and clamp and fix the connecting part.

8. The welding fixture for the valve seat of a bidirectional zero-leakage isolation valve according to claim 7, characterized in that, The side brackets are symmetrically arranged on both sides of the valve seat and respectively clamp the arc-shaped parts (1) on both sides of the connecting part. The side brackets include a plate-shaped first limiting plate (12) and a column-shaped first limiting post (13). The cross-section of the first limiting post (13) is a "D" shaped structure. The arc side of the first limiting post (13) fits into the C-shaped groove (2) of the arc-shaped part (1). The first limiting plate (12) and the first limiting post (13) together clamp the bottom sides of the C-shaped groove (2).

9. The welding fixture for the valve seat of a bidirectional zero-leakage isolation valve according to claim 7, characterized in that, The side support includes a plate-shaped second limiting plate (14) and two sets of symmetrically arranged second limiting posts (15). The second limiting plate (14) is located near the bottom of the C-shaped groove (2) and abuts against the plane side of the arc-shaped part (1). The two sets of second limiting posts (15) are located on both sides of the flange end of the C-shaped groove (2) and clamp the flange end of the C-shaped groove (2).

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