A high-temperature dust-proof hard-sealed floating ball valve

Abstract

The present invention discloses a high-temperature dust-proof hard-seal floating ball valve, comprising a first valve seat, a second valve seat, a ball valve core and a valve stem, the ball valve core is located in the first valve seat and the second valve seat, the valve stem passes through the second valve seat and is slidably plugged into the ball valve core, movable sealing members are provided on both sides of the ball valve core, the movable sealing member comprises an inner ring, an intermediate ring, a first spring and a retaining ring, the intermediate ring and the retaining ring are both located on the outer side of the inner ring, the present invention provides a movable sealing member, when the floating ball valve is closed, the pressure on one side thereof increases to a predetermined value, the inner ring can be pushed to slide and disengage from the interference state with the ball valve core, so that the fluid can enter the upper cavity and the lower cavity for pressure relief, thereby ensuring the safe use of the floating ball valve, and at the same time the fluid pressure in the pressurized chamber can push the connecting rod to move toward the ball valve, so that the plug column can be inserted into the circular slot, thereby providing two support points for the ball valve core, further enhancing the stress stability of the ball valve core.

Description

Technical Field

[0001] The invention discloses a high-temperature dustproof hard-sealed floating ball valve, belonging to the technical field of valve bodies. Background Art

[0002] The ball of the floating ball valve floats. Under the pressure of the medium, the ball can produce a certain displacement and press against the sealing surface of the outlet end to ensure the sealing of the outlet end. The main features of the floating ball valve are compact structure, reliable sealing, simple structure, easy maintenance, the sealing surface and the spherical surface are often in a closed state, not easily eroded by the medium, easy to operate and maintain, and suitable for general working media such as water, solvents, acids and natural gas, and also suitable for media with harsh working conditions.

[0003] The existing floating ball valve is subjected to a large fluid pressure when closed. When the pressure is high, the connection between the ball valve core and the valve stem is a cantilever beam structure, which causes the stability of the ball valve core to be poor, posing a relatively large safety hazard. In addition, the force exerted on the ball valve core will be transmitted to the valve stem and the valve seat. At the same time, the sealing ring that contacts the ball valve core will also be subjected to a large pressure. Since the sealing ring can withstand a limited working load, it is easy to deform when the pressure is overloaded, thereby affecting its sealing with the ball valve core and the valve seat. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to provide a high-temperature dustproof hard-sealed floating ball valve.

[0005] The present invention achieves the above-mentioned purpose through the following technical scheme: a high-temperature dust-proof hard-seal floating ball valve, comprising a first valve seat, a second valve seat, a ball valve core and a valve stem, the ball valve core is located in the first valve seat and the second valve seat, the valve stem passes through the second valve seat and is slidably plugged into the ball valve core, and movable sealing members are provided on both sides of the ball valve core, the movable sealing members comprise an inner ring, an intermediate ring, a first spring and a retaining ring, the intermediate ring and the retaining ring are both located on the outside of the inner ring, the two ends of the first spring respectively abut against the intermediate ring and the retaining ring, and the sides of the retaining ring away from each other are respectively provided with a first rubber ring and a second rubber ring, one side of the inner ring abuts against the ball valve core, and the inner wall of the inner ring is provided with a notch, the inner ring blocks and seals the intermediate ring, the retaining ring, the first rubber ring, the second rubber ring and the first spring between the inner ring and the first valve seat or the second valve seat. In the space formed, the ball valve core is in conflict with the two inner rings, and forms an upper cavity and a lower cavity with the first valve seat and the second valve seat. A sliding rod is provided on the second valve seat, and the sliding rod includes a plug post, a connecting rod, a nut and a second spring. The connecting rod and the second valve seat are slidingly arranged, and the plug post and the nut are connected to the two ends of the connecting rod. A circular slot that cooperates with the plug post is provided on the ball valve core. The second spring is sleeved on the outside of the connecting rod and exerts a force on the plug post to separate from the circular slot. A pressurized chamber is provided in the middle part of the second valve seat corresponding to the connecting rod, and a flow channel connecting the pressurized chamber and the lower cavity is provided in the second valve seat. The second valve seat is respectively provided with a first seal and a second seal at the position corresponding to the connecting rod and the valve stem. When the ball valve core cooperates with the valve stem and the plug post, it has a sliding tendency in the flow direction of the fluid.

[0006] Preferably, the first sealing member includes two sets of pressure-bearing sleeves and third rubber rings which are arranged on the outside of the connecting rod, wherein one set of the pressure-bearing sleeves and the third rubber rings are located in the pressurized chamber, and the other set of the pressure-bearing sleeves and the third rubber rings are located on the outside of the second valve seat, and the pressure-bearing sleeves are in contact with the second spring, and the two third rubber rings are arranged close to each other.

[0007] Preferably, the end of the plug post close to the circular slot has a spherical surface, and the connecting rod is provided with a limiting groove.

[0008] Preferably, a frustum is provided on the side of the third rubber ring close to the pressure sleeve.

[0009] Preferably, the second sealing member includes a pressure block, a sliding sleeve, a fastening bolt and a third spring, the pressure block is located above the sliding sleeve, and both are sleeved on the outside of the valve stem, a cavity is provided on the second valve seat, and the cavity is filled with filler, the fastening bolt passes through the pressure block and is threadedly connected to the second valve seat, and the two ends of the third spring are respectively on the fastening bolt and the pressure block.

[0010] Preferably, one end of the valve stem is connected to a fixing seat, an operating rod is provided through the fixing seat, and a limiting bolt for positioning the operating rod is provided on the fixing seat.

[0011] Preferably, a curved frame is fixedly mounted on the second valve seat, the fixed seat is rotatably connected to the curved frame, a rotating piece is provided on the fixed seat, and a stopper is provided on the curved frame.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] By setting a movable seal, when the floating ball valve is closed and the pressure on one side increases to a predetermined value, the inner ring can be pushed to slide and break away from the interference with the ball valve core, so that the fluid can enter the upper cavity and the lower cavity for pressure relief, thereby ensuring the safe use of the floating ball valve. At the same time, the fluid pressure in the pressurized chamber can push the connecting rod toward the ball valve, so that the plug can be inserted into the circular slot, thereby providing two support points for the ball valve core, further enhancing the force stability of the ball valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of a high-temperature dustproof hard-sealed floating ball valve of the present invention;

[0015] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0016] Figure 3 This is a schematic structural diagram of the connecting rod, the pressure sleeve, and the third rubber ring in the present invention;

[0017] Figure 4 for Figure 1 A partial enlarged view of middle B;

[0018] Figure numerals: 1. first valve seat; 2. sliding sleeve; 3. pressure block; 4. bent frame; 5. rotating plate; 6. fixed seat; 7. limiting bolt; 8. operating lever; 9. block; 10. fastening bolt; 11. third spring; 12. valve stem; 13. upper chamber; 14. ball valve core; 15. second valve seat; 16. lower chamber; 17. circular slot; 18. plug; 19. pressure sleeve; 20. third rubber ring; 21. nut; 22. connecting rod; 23. second spring; 24. flow channel; 25. spherical surface; 26. limiting groove; 27. frustum; 28. first rubber ring; 29. ​​first spring; 30. intermediate ring; 31. inner ring; 32. notch; 33. second rubber ring; 34. retaining ring; 35. movable seal; 36. pressurized chamber. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] like Figure 1-Figure 4 As shown, a high-temperature dustproof hard-sealed floating ball valve includes a first valve seat 1, a second valve seat 15, a ball valve core 14 and a valve stem 12. The ball valve core 14 is located in the first valve seat 1 and the second valve seat 15. The valve stem 12 passes through the second valve seat 15 and is slidably connected to the ball valve core 14. Both sides of the ball valve core 14 are provided with movable seals 35. The movable seals 35 include an inner ring 31, an intermediate ring 30, a first spring 29 and a retaining ring 34. The intermediate ring 30 and the retaining ring 34 are both located on the outside of the inner ring 31. The two ends of the first spring 29 are respectively against the middle ring 30 and the retaining ring 34. The sides of the retaining ring 34 away from each other are respectively provided with the first rubber ring 28 and the second rubber ring 33. One side of the inner ring 31 is in contact with the ball valve core 14, and the inner wall of the inner ring 31 is provided with a notch 32. The inner ring 31 blocks and seals the middle ring 30, the retaining ring 34, the first rubber ring 28, the second rubber ring 33 and the first spring 29 in the space formed by the inner ring 31 and the first valve seat 1 or the second valve seat 15. In the space, the ball valve core 14 contacts the two inner rings 31 and forms an upper cavity 13 and a lower cavity 16 with the first valve seat 1 and the second valve seat 15. A sliding plug rod is provided on the second valve seat 15. The sliding plug rod includes a plug column 18, a connecting rod 22, a nut 21 and a second spring 23. The connecting rod 22 is slidably arranged with the second valve seat 15, and the plug column 18 and the nut 21 are connected to the two ends of the connecting rod 22. A circular slot 17 that cooperates with the plug column 18 is provided on the ball valve core 14. The second spring 23 It is sleeved on the outside of the connecting rod 22 and applies a force to the plug column 18 to disengage from the circular slot 17. The second valve seat 15 is provided with a pressurized chamber 36 in the middle part corresponding to the connecting rod 22, and a flow channel 24 connecting the pressurized chamber 36 and the lower chamber 16 is provided in the second valve seat 15. The second valve seat 15 is provided with a first seal and a second seal at the positions corresponding to the connecting rod 22 and the valve stem 12 respectively. When the ball valve core 14 cooperates with the valve stem 12 and the plug column 18, it has a sliding tendency in the flow direction of the fluid.

[0021] The first sealing member includes two sets of pressure sleeves 19 and third rubber rings 20 arranged on the outside of the connecting rod 22, one set of pressure sleeves 19 and the third rubber ring 20 are located in the pressurized chamber 36, and the other set of pressure sleeves 19 and the third rubber ring 20 are located on the outside of the second valve seat 15, and the pressure sleeve 19 abuts against the second spring 23. The two third rubber rings 20 are arranged in a state close to each other, and the end of the plug post 18 close to the circular slot 17 has a spherical surface 25, a limiting groove 26 is provided on the connecting rod 22, and a round table surface 27 is provided on the side of the third rubber ring 20 close to the pressure sleeve 19. The second sealing member includes a pressure block 3, a sliding sleeve 2, a fastening bolt 10 and The third spring 11 and the pressure block 3 are located above the sliding sleeve 2, and both are sleeved on the outside of the valve stem 12. A cavity is provided on the second valve seat 15, and the cavity is filled with filler. The fastening bolt 10 passes through the pressure block 3 and is threadedly connected to the second valve seat 15. The two ends of the third spring 11 are respectively on the fastening bolt 10 and the pressure block 3. One end of the valve stem 12 is connected to the fixed seat 6, and the operating rod 8 is penetrated through the fixed seat 6, and the fixed seat 6 is provided with a limit bolt 7 for positioning the operating rod 8. The second valve seat 15 is fixedly installed with a bent frame 4, and the fixed seat 6 is rotatably connected to the bent frame 4, and a rotating piece 5 is provided on the fixed seat 6, and a stopper 9 is provided on the bent frame 4.

[0022] Working principle: When the operating rod 8 drives the fixed seat 6 and the valve stem 12 to rotate, the fluid in the floating ball valve can be switched from the flowing state to the closed state. The lever arm of the operating rod 8 can be controlled by the limit bolt 7 to facilitate manual rotation of the ball valve core 14. At this time, the ball valve core 14 is subjected to the pressure of the fluid, and the upper chamber 13 and the lower chamber 16 are in a low pressure state. When the fluid pressure continues to increase, the pressure generated by the fluid pushes the notch 32 and the inner ring 31 slides, so that it is out of the state of interference with the ball valve core 14, and a gap for fluid to pass through is formed between the two. The fluid smoothly enters the upper chamber 13 and the lower chamber 16, thereby achieving a pressure relief state, thereby reducing the hidden danger of safety of the ball valve core 14 caused by excessive pressure. When the fluid pressure continues to increase, when the pressure in the lower chamber 16 is the same as that on the fluid inlet side, the fluid in the pressurized chamber 36 will push the plug 18 toward the ball valve core 14 and insert it into the circular slot 17, so that the ball valve core 14 is supported by the upper and lower positions, thereby Increasing the pressure on the front of the ball valve core 14 further enhances the stability of the ball valve core 14, and the ball valve core 14 has a movement trend in the same direction as the fluid flow. When subjected to fluid pressure, it can always maintain contact with the inner ring 31 on the other side, thereby effectively blocking the flow of the fluid and sealing it. Since the first spring 29 is located in the space formed by the inner ring 31, the first valve seat 1 and the second valve seat 15, and is sealed by the first rubber ring 28 and the second rubber ring 33, the fluid cannot enter between the retaining ring 34 and the intermediate ring 30, thereby preventing the first spring 29 from being affected by impurities in the fluid and failing. In addition, the inner ring 31 can scrape off impurities on the surfaces of the first valve seat 1, the second valve seat 15 and the ball valve core 14 during the sliding process, so as to achieve a local automatic cleaning effect, thereby avoiding affecting the cooperative sealing of the inner ring 31 and the three. Especially in the use scenario of high-temperature fluid containing impurities, it can also prevent impurities from adhering to the relative movement of the ball valve core 14 and the inner ring 31, thereby preventing locking.

[0023] At the same time, when fluid enters the upper and lower chambers 13 and 16, the seal between the valve stem 12 and the second valve seat 15 is achieved by the second sealing member. By adjusting the compression of the third spring 11 to compact the packing, the sealing requirements in different scenarios can be met. The sealing of the connecting rod 22 is achieved by two sets of pressure sleeves 19 and a third rubber ring 20. When the fluid pressure in the pressurized chamber 36 increases, the fluid pressure can exert a force on the pressure sleeve 19 located in the pressurized chamber 36, causing the third rubber ring 20 to deform and achieve a seal. When the pressure in the pressurized chamber 36 is low, the second spring 23 exerts pressure on the pressure sleeve 19 located outside the second valve seat 15, causing the third rubber ring 20 to deform and achieve a seal. The inner diameter of the third rubber ring 20 is thicker than the outer diameter, which improves the sealing effect when it deforms. In addition, when the ball valve core 14 is in the state of closing the fluid flow, the plug 18 does not cooperate with the circular slot 17, which can achieve a labor-saving effect.

[0024] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0025] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A high-temperature dustproof hard-sealed floating ball valve, comprising a first valve seat (1), a second valve seat (15), a ball valve core (14) and a valve stem (12), characterized in that: The ball valve core (14) is located in the first valve seat (1) and the second valve seat (15), the valve stem (12) passes through the second valve seat (15) and is slidably connected to the ball valve core (14), and movable seals (35) are provided on both sides of the ball valve core (14), and the movable seals (35) include an inner ring (31), an intermediate ring (30), a first spring (29) and a retaining ring (34), and the intermediate ring (30) and the retaining ring (34) are both located outside the inner ring (31), and the two ends of the first spring (29) are respectively against the intermediate ring (30) and the retaining ring (34). The side surfaces of the retaining ring (34) away from each other are respectively provided with a first rubber ring (28) and a second rubber ring (33), one side of the inner ring (31) is in contact with the ball valve core (14), and the inner wall of the inner ring (31) is provided with a notch (32), and the inner ring (31) blocks and seals the intermediate ring (30), the retaining ring (34), the first rubber ring (28), the second rubber ring (33) and the first spring (29) in the space formed by the inner ring (31) and the first valve seat (1) or the second valve seat (15), and the ball valve core (14) is in contact with the two inner rings (31). The first valve seat (1) and the second valve seat (15) form an upper cavity (13) and a lower cavity (16), the second valve seat (15) is provided with a sliding plug rod, the sliding plug rod includes a plug column (18), a connecting rod (22), a nut (21) and a second spring (23), the connecting rod (22) and the second valve seat (15) are slidingly arranged, and the plug column (18) and the nut (21) are connected to the two ends of the connecting rod (22), the ball valve core (14) is provided with a circular slot (17) matched with the plug column (18), the second spring (23) is sleeved on the connecting rod (22), and the plug column (18) and the nut (21) are connected to the two ends of the connecting rod (22). The outer side of the connecting rod (22) is provided, and a force is applied to the plug column (18) to separate from the circular slot (17); the second valve seat (15) is provided with a pressurizing chamber (36) in the middle of the corresponding connecting rod (22), and a flow channel (24) is provided in the second valve seat (15) to connect the pressurizing chamber (36) and the lower chamber (16); the second valve seat (15) is provided with a first sealing member and a second sealing member at the position corresponding to the connecting rod (22) and the valve stem (12), respectively; the ball valve core (14) has a sliding tendency in the flow direction of the fluid when it cooperates with the valve stem (12) and the plug column (18).

2. A high-temperature dustproof hard-sealed floating ball valve according to claim 1, characterized in that: The first sealing member includes two sets of pressure-bearing sleeves (19) and third rubber rings (20) which are arranged on the outside of the connecting rod (22), wherein one set of the pressure-bearing sleeves (19) and the third rubber ring (20) is located in the pressurized chamber (36), and the other set of the pressure-bearing sleeves (19) and the third rubber ring (20) is located on the outside of the second valve seat (15), and the pressure-bearing sleeves (19) are in contact with the second spring (23), and the two third rubber rings (20) are arranged in a state close to each other.

3. A high-temperature dustproof hard-sealed floating ball valve according to claim 2, characterized in that: One end of the plug post (18) close to the circular slot (17) has a spherical surface (25), and a limiting groove (26) is provided on the connecting rod (22).

4. A high-temperature dustproof hard-sealed floating ball valve according to claim 2, characterized in that: A frustum surface (27) is provided on one side of the third rubber ring (20) close to the pressure sleeve (19).

5. A high-temperature dustproof hard-sealed floating ball valve according to claim 1, characterized in that: The second sealing member comprises a pressure block (3), a sliding sleeve (2), a fastening bolt (10) and a third spring (11); the pressure block (3) is located above the sliding sleeve (2); both are sleeved on the outside of the valve stem (12); a cavity is provided on the second valve seat (15); the cavity is filled with filler; the fastening bolt (10) passes through the pressure block (3) and is threadedly connected to the second valve seat (15); and the two ends of the third spring (11) are respectively on the fastening bolt (10) and the pressure block (3).

6. A high-temperature dustproof hard-sealed floating ball valve according to claim 1, characterized in that: One end of the valve stem (12) is connected to a fixed seat (6), an operating rod (8) is provided through the fixed seat (6), and a limiting bolt (7) for positioning the operating rod (8) is provided on the fixed seat (6).

7. A high-temperature dustproof hard-sealed floating ball valve according to claim 6, characterized in that: A curved frame (4) is fixedly mounted on the second valve seat (15), the fixed seat (6) is rotatably connected to the curved frame (4), a rotating plate (5) is provided on the fixed seat (6), and a stopper (9) is provided on the curved frame (4).

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