Anti-jamming floating valve seat ball valve

Abstract

The utility model relates to ball valve technical field provides a kind of anti-jamming floating valve seat ball valve, including valve body, valve core, the valve stem being worn in valve body and the two valve seats being symmetrically arranged in the two sides of valve core, the inner wall of valve body is equipped with the installation groove for placing valve seat, valve seat is slidably arranged in installation groove inside, the outer surface of valve seat and valve core abut, and the elastic compensation component with one end and valve body abut, the other end and valve seat abut is equipped between valve seat and valve body, the elastic compensation component makes valve seat compress tightly on valve core, and the balance cavity that is communicated with sliding space is further equipped between valve body and valve seat, and the flow passage between balance cavity and valve body is closed by first metal bellow, and the both ends of first metal bellow are connected with valve body and valve seat respectively.The utility model can isolate balance cavity and valve body flow passage by first metal bellow, avoid impurity into balance cavity and sliding space inside to cause jam when valve seat slides.

Description

Technical Field

[0001] This application relates to the field of ball valve technology, and in particular to an anti-jamming floating seat ball valve. Background Technology

[0002] A ball valve is a type of valve whose opening and closing element is spherical. The spherical valve core has a channel, and the valve can be opened and closed by rotating the valve core through an operating mechanism.

[0003] The internal seal of a ball valve relies on the valve core abutting against the annular valve seats on both sides. During rotation, the sealing surface of the valve core wears against the sealing surface of the valve seat. For ball valves with fixed valve seats, after long-term use, wear can create large gaps between the valve core and the valve seat, leading to valve leakage. To address this issue, many ball valves on the market have valve seats that can move axially along the valve body flow path. An elastic compensation component located on the side of the valve seat away from the valve core applies elastic force to the valve seat, keeping the valve seat and valve core in close contact at all times. This ensures an effective seal is maintained even after wear occurs between the valve core and the valve seat.

[0004] In existing ball valves, a certain gap needs to be maintained between the valve seat and the valve body on the side furthest from the valve core to allow the valve seat position to float. When a low-cleanliness medium flows through the ball valve, impurities inside the medium will gradually accumulate in the gap between the valve seat and the valve body. After long-term operation, the valve seat movement may become stuck, affecting the normal operation of the ball valve. Utility Model Content

[0005] This application provides an anti-jamming floating seat ball valve, which can improve the technical problem in related technologies where impurities easily clog the gap between the valve seat and the valve body, causing the valve movement to jam.

[0006] This application provides an anti-jamming floating seat ball valve, comprising: a valve body, a valve core rotatably disposed inside the valve body, a rotatable valve stem passing through the valve body and fixedly connected at one end to the valve core, and two valve seats symmetrically disposed on both sides of the valve core. The inner wall of the valve body has an installation groove for accommodating the valve seats. The valve seats are slidably disposed inside the installation groove. The sealing surface of the valve seats abuts against the outer surface of the valve core. A sliding space exists between the end of the valve seat away from the valve core and the valve body. An elastic compensation component, with one end abutting against the valve body and the other end abutting against the valve seat, is provided within this sliding space. This elastic compensation component applies a force to the valve seat, pressing it tightly against the valve core. A balance chamber communicating with the sliding space is also provided between the valve body and the valve seats at the sliding space location. The balance chamber is sealed to the flow channel of the valve body by a first metal bellows, with both ends of the first metal bellows connected to the valve body and the valve seats, respectively.

[0007] The anti-jamming floating seat ball valve provided in this application embodiment can maintain effective isolation between the balance chamber and the valve body flow channel through the first metal bellows, preventing impurities contained in the flowing medium in the valve body flow channel from entering the balance chamber and the sliding space, which would cause jamming when the valve seat slides.

[0008] In some embodiments, the ball valve further includes a pressure balancing assembly, which includes a second metal bellows and a balance plate. One end of the second metal bellows is fixedly connected to the inner wall of the valve body, and the balance plate is fixedly disposed on the end of the second metal bellows away from the valve body. The balance plate has microholes for connecting the flow channel of the valve body with the interior of the second metal bellows, and the valve body has a communicating cavity for connecting the interior of the second metal bellows with the balance cavity.

[0009] In some embodiments, a protective groove is formed on the inner wall of the valve body, and the second metal bellows is located inside the protective groove.

[0010] In some embodiments, the pressure balancing assembly further includes a guide rod disposed inside the second metal bellows. One end of the guide rod is fixedly connected to the balance plate, and the other end passes through the inner wall of the valve body and is located inside the communicating cavity. The guide rod is slidably connected to the valve body.

[0011] In some embodiments, a guide groove is provided on the inner wall of the mounting groove, and a guide strip is provided on the outer peripheral surface of the valve seat, which is slidably connected inside the guide groove to guide the sliding of the valve seat.

[0012] In some embodiments, the elastic compensation component includes a plurality of springs disposed inside the mounting slot, the two ends of the springs respectively abutting against the end of the valve seat away from the valve core and the inner wall of the valve body.

[0013] In some embodiments, the inner wall of the valve body and the end of the valve seat away from the valve core are provided with limiting posts that pass through the spring and are used to limit the two ends of the spring. Attached Figure Description

[0014] Figure 1 A schematic diagram of the overall structure of an anti-jamming floating seat ball valve provided in this application embodiment;

[0015] Figure 2 A cross-sectional view of an anti-jamming floating seat ball valve provided in an embodiment of this application;

[0016] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0017] Figure 4 for Figure 2 Enlarged view of section B;

[0018] Figure 5 This is a schematic diagram of the overall structure of the valve seat provided in an embodiment of this application.

[0019] The following are the labeling elements in the figure:

[0020] 1. Valve body; 11. Mounting groove; 12. Balancing chamber; 13. Connecting chamber; 14. Protective groove; 15. Guide groove; 2. Valve core; 3. Valve stem; 4. Valve seat; 41. Guide bar; 51. Spring; 52. Limiting post; 6. First metal bellows; 7. Pressure balancing assembly; 71. Second metal bellows; 72. Balancing plate; 73. Guide rod. Detailed Implementation

[0021] In existing ball valves, a certain gap needs to be maintained between the valve seat and the valve body on the side furthest from the valve core to allow the valve seat position to float. When a low-cleanliness medium flows through the ball valve, impurities inside the medium will gradually accumulate in the gap between the valve seat and the valve body. After long-term operation, the valve seat movement may become stuck, affecting the normal operation of the ball valve.

[0022] Based on this, in order to improve the problem that impurities are easily blocked in the gap between the valve seat and the valve body in the related technology, resulting in valve movement jamming, the embodiments of this application provide the following solution.

[0023] The following combination Figures 1-5 This application will be described in further detail.

[0024] This embodiment discloses an anti-jamming floating valve ball valve, comprising: a valve body 1, a valve core 2 rotatably disposed inside the valve body 1, a rotatable valve stem 3 passing through the valve body 1 and fixedly connected at one end to the valve core 2, and two valve seats 4 symmetrically disposed on both sides of the valve core 2. An installation groove 11 for accommodating the valve seats 4 is provided on the inner wall of the valve body 1. The valve seats 4 are slidably disposed inside the installation groove 11. The sealing surface of the valve seats 4 abuts against the outer surface of the valve core 2. There is a sliding space between the end of the valve seats 4 away from the valve core 2 and the valve body 1. An elastic compensation component is provided in the sliding space, with one end abutting against the valve body 1 and the other end abutting against the valve seats 4. The elastic compensation component is used to apply a force to the valve seats 4 to press the valve seats 4 against the valve core 2. A balance chamber 12 communicating with the sliding space is also provided between the valve body 1 and the valve seats 4 at the sliding space. The balance chamber 12 and the flow channel of the valve body 1 are sealed by a first metal bellows 6. The two ends of the first metal bellows 6 are respectively connected to the valve body 1 and the valve seats 4.

[0025] As can be seen from the above, the anti-jamming floating seat ball valve provided in this application embodiment has a seal formed by welding the first metal bellows 6 to the valve seat 4 and the valve body 1. When the valve seat 4 moves axially along the flow channel of the valve body 1 inside the mounting groove 11, the end of the first metal bellows 6 connected to the valve seat 4 moves with the valve seat 4, and its body contracts or extends. The first metal bellows 6 can maintain effective isolation between the balance chamber 12 and the flow channel of the valve body 1, preventing impurities contained in the flowing medium in the flow channel of the valve body 1 from entering the balance chamber 12 and the sliding space, which would cause the valve seat 4 to jam when sliding.

[0026] In some embodiments, please refer to the following: Figures 2 to 4 The ball valve also includes a pressure balancing assembly 7, which includes a second metal bellows 71 and a balancing plate 72. One end of the second metal bellows 71 is fixedly connected to the inner wall of the valve body 1, and the balancing plate 72 is fixedly disposed on the end of the second metal bellows 71 away from the valve body 1. The balancing plate 72 has micro-holes for connecting the flow channel of the valve body 1 with the interior of the second metal bellows 71. The valve body 1 has a communicating cavity 13 for connecting the interior of the second metal bellows 71 with the balancing cavity 12.

[0027] With this configuration, when a high-pressure medium flows inside the valve body 1, due to the isolation between the balance chamber 12 and the flow channel of the valve body 1, there may be a large pressure difference on both sides of the first metal bellows 6, causing the pipe walls on both sides of the first metal bellows 6 to deform due to uneven stress. The pressure balancing assembly 7 can balance the pressure on both sides of the first metal tube. When the medium flows through the flow channel of the valve body 1, the medium can slowly flow into the connecting cavity 13 and the balancing cavity 12 through the micro-holes on the balancing plate 72 until the medium fills the connecting cavity 13 and the balancing cavity 12. When there is a large pressure difference between the balancing cavity 12 and the flow channel of the valve body 1, there is a large pressure difference between the two ends of the balancing plate 72. The medium in the flow channel pushes the balancing plate 72 to move closer to the inside of the second metal bellows 71. The balancing plate 72 compresses the second metal bellows 71 and the medium inside the balancing cavity 12 at the same time, so that the pressure of the medium inside the balancing cavity 12 increases until the pressure on both sides of the first metal bellows 6 reaches a balanced state, thereby avoiding the deformation of the pipe wall due to uneven force caused by the pressure imbalance on both sides of the first metal bellows 6.

[0028] Optionally, in some embodiments, please refer to Figure 2 and Figure 4 A protective groove 14 is provided on the inner wall of the valve body 1, and the second metal bellows 71 is located inside the protective groove 14.

[0029] This configuration, by placing the second metal bellows 71 inside the protective groove 14, can prevent the medium in the flow channel of the valve body 1 from directly impacting the outer wall of the second metal bellows 71, which would cause the second metal bellows 71 to deform and be damaged, thus protecting the second metal bellows 71.

[0030] Optionally, please refer to Figure 2 and Figure 4 The pressure balancing assembly 7 also includes a guide rod 73, which is disposed inside the second metal bellows 71. One end of the guide rod 73 is fixedly connected to the balance plate 72, and the other end passes through the inner wall of the valve body 1 and is located inside the communicating cavity 13. The guide rod 73 is slidably connected to the valve body 1.

[0031] With this configuration, the pressure exerted by the medium in the flow channel of valve body 1 on the outer circumference of the second metal bellows 71 may be different at different points, which may cause the pipe wall of the second metal bellows 71 to bend. The guide rod 73 can support the end of the second metal bellows 71 away from valve body 1 through the balance plate 72, and guide the end of the second metal bellows 71 away from valve body 1 so that the second metal bellows 71 always extends and contracts axially, thereby reducing the possibility of the second metal bellows 71 bending laterally.

[0032] In some embodiments, please refer to Figures 2 to 5 A guide groove 15 is provided on the inner wall of the mounting groove 11, and a guide bar 41 is provided on the outer peripheral surface of the valve seat 4, which is slidably connected inside the guide groove 15 to guide the sliding of the valve seat 4.

[0033] With this configuration, the valve seat 4 may shift its position when sliding inside the mounting groove 11 due to uneven force distribution. This shift can cause gaps between the valve seat 4 and the valve core 2, resulting in valve leakage. Additionally, the shift in the valve seat 4 can cause the first metal bellows 6 to twist and become damaged. When the valve seat 4 slides, the guide groove 15 limits the guide bar 41, thereby guiding the movement of the valve seat 4 and preventing the valve seat 4 from shifting its position.

[0034] Optionally, in some embodiments, please refer to Figure 2 and Figure 3 The elastic compensation component includes multiple springs 51 installed inside the mounting slot 11. The two ends of the springs 51 abut against the end of the valve seat 4 away from the valve core 2 and the inner wall of the valve body 1, respectively.

[0035] With this configuration, when assembling the valve, the valve core 2 pushes the valve seat 4 to compress the spring 51. The spring 51 applies a preload force to the valve seat 4, causing the valve seat 4 to fit tightly against the valve core 2 to form a seal. When the valve core 2 rotates or wear occurs between the valve core 2 and the valve seat 4, the spring 51 can push the valve seat 4 to slide so that it always fits tightly against the valve core 2, thus providing elastic compensation for the valve seat 4.

[0036] Optionally, please refer to Figure 2 and Figure 3 The inner wall of the valve body 1 and the end of the valve seat 4 away from the valve core 2 are provided with limiting posts 52 that pass through the inside of the spring 51 to limit the two ends of the spring 51.

[0037] With this configuration, the limiting posts 52 at both ends of the spring 51 can prevent the spring 51 from shifting position during the extension and retraction process, thereby keeping the thrust applied by each spring 51 to the valve seat 4 uniform and making the valve operation more stable.

[0038] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A ball valve with anti-jamming floating seat, comprising a valve body (1), a valve core (2) rotatably disposed inside the valve body (1), a rotatable valve stem (3) passing through the valve body (1) and fixedly connected at one end to the valve core (2), and two valve seats (4) symmetrically disposed on both sides of the valve core (2), wherein the inner wall of the valve body (1) is provided with a mounting groove (11) for placing the valve seats (4), the valve seats (4) are slidably disposed inside the mounting groove (11), the sealing surface of the valve seats (4) abuts against the outer surface of the valve core (2), and there is a sliding space between the end of the valve seats (4) away from the valve core (2) and the valve body (1), wherein an elastic compensation component is provided in the sliding space, one end of which abuts against the valve body (1) and the other end of which abuts against the valve seat (4), the elastic compensation component being used to apply a force to the valve seat (4) to press the valve seat (4) against the valve core (2), characterized in that: The valve body (1) is located between the sliding space and the valve seat (4) and is provided with a balance chamber (12) that communicates with the sliding space. The balance chamber (12) and the flow channel of the valve body (1) are sealed by a first metal bellows (6). The two ends of the first metal bellows (6) are respectively connected to the valve body (1) and the valve seat (4).

2. The anti-jamming floating seat ball valve according to claim 1, characterized in that: The ball valve also includes a pressure balancing assembly (7), which includes a second metal bellows (71) and a balance plate (72). One end of the second metal bellows (71) is fixedly connected to the inner wall of the valve body (1). The balance plate (72) is fixedly disposed on the end of the second metal bellows (71) away from the valve body (1). The balance plate (72) has micro-holes for connecting the flow channel of the valve body (1) with the interior of the second metal bellows (71). The valve body (1) has a communicating cavity (13) for connecting the interior of the second metal bellows (71) with the balance cavity (12).

3. The anti-jamming floating seat ball valve according to claim 2, characterized in that: The valve body (1) has a protective groove (14) on its inner wall, and the second metal bellows (71) is located inside the protective groove (14).

4. A ball valve with anti-jamming floating seat according to claim 2 or 3, characterized in that: The pressure balancing assembly (7) also includes a guide rod (73), which is disposed inside the second metal bellows (71). One end of the guide rod (73) is fixedly connected to the balance plate (72), and the other end passes through the inner wall of the valve body (1) and is located inside the communicating cavity (13). The guide rod (73) is slidably connected to the valve body (1).

5. A ball valve with anti-jamming floating seat according to claim 1, 2, or 3, characterized in that: The inner wall of the mounting groove (11) is provided with a guide groove (15), and the outer circumferential surface of the valve seat (4) is provided with a guide strip (41) that is slidably connected inside the guide groove (15) to guide the sliding of the valve seat (4).

6. A ball valve with anti-jamming floating seat according to claim 1, 2, or 3, characterized in that: The elastic compensation component includes multiple springs (51) set inside the mounting groove (11), with the two ends of the springs (51) abutting against the end of the valve seat (4) away from the valve core (2) and the inner wall of the valve body (1), respectively.

7. A ball valve with anti-jamming floating seat according to claim 6, characterized in that: The inner wall of the valve body (1) and the end of the valve seat (4) away from the valve core (2) are provided with limiting posts (52) that pass through the inside of the spring (51) to limit the two ends of the spring (51).

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