Butterfly valve

Abstract

The invention discloses a butterfly valve which comprises a valve body, a core valve body, a butterfly plate and a sealing piece. An inlet, an outlet and a window are formed in the valve body, the core valve body is arranged in the valve body and can move relative to the valve body, the butterfly plate is arranged on the core valve body and can rotate relative to the core valve body, and the sealing piece is arranged on the peripheral face of the butterfly plate and can form contact sealing with the core valve body. The core valve body can move to a first station relative to the valve body, the butterfly plate is located between the outlet and the inlet, the window is not communicated with the inlet and the outlet, and the butterfly plate can rotate relative to the core valve body to control connection and disconnection between the outlet and the inlet; the core valve body can move to a second station relative to the valve body, the butterfly plate is located at the window, the inlet and the outlet are communicated and not communicated with the window, and the sealing piece can be disassembled and assembled through the window. The butterfly valve can realize on-line replacement and maintenance of the sealing element, is convenient and fast, and saves labor.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a butterfly valve. Background Art

[0002] The butterfly valve, also known as the flap valve, is a simple regulating valve with a disc as the closing part (valve disc or butterfly plate). It is a valve that is opened and closed by rotating around the valve stem. The butterfly valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Therefore, the butterfly valve is widely used in the fields of industry, electricity, petroleum, chemical industry, metallurgy, mining, etc.

[0003] In the prior art, a seal is generally installed on the butterfly plate. When the butterfly valve is closed, the seal is squeezed by the butterfly plate and the valve seat to form a seal. When the butterfly valve is opened, the butterfly plate can be rotated to open the valve port. However, in the process of rotating the butterfly plate, friction is generated between the valve seat and the seal, which causes the seal to wear after long-term use, causing the butterfly valve to leak. Therefore, the butterfly valve needs to be regularly maintained to replace the seal.

[0004] Since the seal is set on the butterfly plate, when performing maintenance, the butterfly valve needs to be removed from the pipeline, and then the butterfly valve needs to be disassembled, the butterfly plate needs to be taken out, and the seal needs to be replaced. When the butterfly valve is used in the field, workers need to carry a lot of tools to dismantle and repair it, which makes the maintenance process time-consuming and laborious. When the butterfly valve is disassembled, the medium in the pipeline needs to be stopped and the pipeline needs to be maintained, which will affect the use of the pipeline. Summary of the invention

[0005] In view of the above problems, the present invention proposes a butterfly valve to overcome the above problems or at least partially solve the above problems.

[0006] A butterfly valve, comprising a valve body, a core valve body, a butterfly plate and a sealing member; the valve body is provided with an inlet, an outlet and a window, the core valve body is arranged in the valve body and can move relative to the valve body, the butterfly plate is arranged on the core valve body and can rotate relative to the core valve body, and the sealing member is arranged on the outer peripheral surface of the butterfly plate and can form a contact seal with the core valve body; The core valve body can move to a first position relative to the valve body, the butterfly plate is located between the outlet and the inlet, the window is not connected to the inlet and the outlet, and the butterfly plate can rotate relative to the core valve body to control the opening and closing between the outlet and the inlet; The core valve body can be moved to a second position relative to the valve body, the butterfly plate is located at the window, the inlet is connected to the outlet and is not connected to the window, and the sealing component can be disassembled and assembled through the window.

[0007] Preferably, the butterfly valve also includes a sliding plate, and the sealing member is sleeved on one end of the butterfly plate along the axial direction of the butterfly plate; the sliding plate is arranged in the butterfly plate and sleeved on one end of the sealing member, and can move along the radial and axial directions of the butterfly plate respectively to press and fix the sealing member on the butterfly plate.

[0008] Preferably, the butterfly valve further comprises a track plate; the track plate is slidably arranged on the butterfly plate along the axial direction of the butterfly plate, and the sliding plate is arranged on the track plate and can reciprocate radially relative to the track plate along the butterfly plate.

[0009] Preferably, the butterfly valve further comprises a butterfly spring, a transmission rod, a follower rod and a transmission spring; the butterfly spring is located between the butterfly plate and the track plate to drive the track plate to move away from the butterfly plate along the axial direction of the butterfly plate; a track limiter is provided on the track plate to limit the position where the butterfly spring drives the track plate to move; along the axial direction of the butterfly plate, the follower rod is coaxially slidably arranged with the track plate, and one end of the follower rod is connected to the first sliding plate of the sliding plates through the first connecting rod as a connecting end to drive the first sliding plate to reciprocate relative to the track plate. The cam is provided with a follower limit platform to limit the position of the connecting end of the follower rod moving toward the direction close to the butterfly plate; along the axial direction of the butterfly plate, the transmission rod and the follower rod are coaxially slidably arranged, and one end of the transmission rod is connected to the second sliding plate in the other part of the sliding plate through the second connecting rod as the connecting end to drive the second sliding plate to reciprocate relative to the track plate; the transmission spring is located between the transmission rod and the follower rod, and the connecting end of the transmission rod can overcome the transmission spring and move to form abutment with the connecting end of the follower rod.

[0010] Preferably, the butterfly valve also includes a control head, a fixed shaft, and a transmission slider; the control head is connected to the core valve body and can rotate relative to the core valve body, the control head is provided with a control groove, and when the core valve body is in the first position, the control groove is along the axial direction of the butterfly plate; the fixed shaft is fixedly arranged on the core valve body, and the top of the fixed shaft is provided with a fixing pin facing the control groove; the top of the transmission slider is slidably connected with the control groove and can reciprocate along the control groove, and the bottom of the transmission slider is provided with a transmission groove perpendicular to the control groove, the fixing pin is slidably connected with the transmission groove and can reciprocate relatively along the transmission groove; the transmission slider is provided with an arc-shaped transmission slide groove, and the other end of the transmission rod is provided with an arc-shaped rod track, the rod track and the transmission slide groove form an arc-shaped sliding connection, the transmission slide groove remains coaxial with the axis of the butterfly plate for opening and closing rotation, and the rod track can move to abut against the follower rod.

[0011] Preferably, the butterfly valve further comprises a driver and a valve stem; the driver is fixed on the control head, one end of the valve stem is connected to the output end of the driver, and the other end of the valve stem is connected to the butterfly plate.

[0012] Preferably, the driver uses a motor with a built-in brake.

[0013] Preferably, the butterfly valve also includes a locking pin and a locking spring; the locking pin is slidably arranged on the core valve body, and the locking spring is located between the locking pin and the core valve body to drive the locking pin to move to fix the control head and the core valve body.

[0014] Preferably, the butterfly valve further comprises a switching pin and a switching spring; the switching pin is slidably arranged on the valve body, and the switching spring is located between the switching pin and the valve body to drive the switching pin to move to restrict the core valve body to the first position.

[0015] Preferably, the butterfly valve also includes a cover plate, a cover plate pin and a cover plate spring; the cover plate can cover the window, the cover plate pin is slidably connected to the valve body, and the cover plate spring is located between the cover plate pin and the valve body to drive the cover plate pin to move and keep the cover plate fixed to the window.

[0016] The butterfly valve of the present invention has the following beneficial technical effects: 1. In the present invention, by providing a valve body with a window and a core valve body, when the seal needs to be replaced, it is only necessary to control the core valve body to move to the second station, and then the seal can be replaced from the window, without removing the butterfly plate from the pipeline to achieve the replacement of the seal, so that workers do not need to carry a large number of tools to disassemble, but only need to carry the seal, which is convenient and fast, saves labor, and realizes online maintenance.

[0017] 2. In the present invention, a track plate and a first sliding plate and a second slide plate are arranged on the butterfly plate, so that the first sliding plate and the second slide plate can slide orderly relative to the butterfly plate under the drive of the butterfly plate, so that the first sliding plate and the second sliding plate can be extended outward to press and fix the seal, and the first sliding plate and the second sliding plate can be contracted and closed to expose the seal, so that the seal can be quickly removed from the butterfly plate, saving manpower and improving the protection of the seal.

[0018] 3. In the present invention, a rotatable control head is provided so that when the control head is in the first position of the core valve body, the butterfly plate can be driven to rotate by rotating the valve stem, thereby controlling the opening and closing of the butterfly valve to achieve normal operation of the butterfly valve. When the control head is in the second position of the core valve body, driving the control head to rotate can drive the track plate and the sliding plate to move in an orderly manner, so that the seal can be quickly disassembled, and it is ensured that the disassembly of the seal does not conflict with the normal flow of the butterfly valve, and the butterfly valve can achieve rapid online maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the cross-sectional structure of the butterfly valve of this embodiment; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction; Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure along the BB direction; Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure along the CC direction; Figure 5 for Figure 1 The schematic diagram of the local enlarged structure at position I in the middle; Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure along the DD direction; Figure 7 for Figure 3 Schematic diagram of the local enlarged structure at II in the middle. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] Combination Figures 1 to 7 As shown, the butterfly valve of this embodiment includes a valve body 1, a core valve body 2, a butterfly plate 3 and a sealing member 4. The valve body 1 is provided with an inlet 5, an outlet 6 and a window 7, the core valve body 2 is arranged in the valve body 1 and can reciprocate relative to the valve body 1, the butterfly plate 3 is arranged on the core valve body 2 and can rotate relative to the core valve body 2, and the sealing member 4 is arranged on the outer peripheral surface of the butterfly plate 3 and can form a contact seal with the core valve body 2.

[0022] The core valve body 2 can move to the first position relative to the valve body 1, at which time the butterfly plate 3 is located between the inlet 5 and the outlet 6, and the window 7 is not connected to the inlet 5 and the outlet 6, and the butterfly plate 3 can rotate relative to the core valve body 2 to control the opening and closing between the outlet 6 and the inlet 5. The core valve body 2 can also move to the second position relative to the valve body 1, at which time the butterfly plate 3 is located at the window 7, and the inlet 5 is connected to the outlet 6 but not to the window 7, and the seal 4 can be disassembled through the window 7.

[0023] In this embodiment, by providing a valve body and a core valve body with a window, when the seal needs to be replaced, it is only necessary to control the core valve body to move to the second workstation, and then the seal can be replaced from the window without removing the butterfly plate from the pipeline. Therefore, there is no need for workers to carry a large number of tools for disassembly, but only need to carry the seal, which is convenient, fast and saves labor.

[0024] Combination Figure 1 and Figure 2 As shown, in this embodiment, by arranging the inlet 5 and the outlet 6 on the same straight line, and arranging the window 7 above the straight line where the inlet 5 and the outlet 6 are located, the core valve body 2 can be reciprocated in the vertical direction relative to the valve body 1, so that the core valve body 2 can be moved between the inlet 5, the outlet 6 and the window 7, and the seal formed between the sealing member arranged on the core valve body 2 and the inner wall of the valve body 1 can avoid the connection between the window 7 and the inlet 5 and the outlet 6.

[0025] Combination Figure 5 As shown, in the butterfly valve of this embodiment, a sliding plate 8 is further provided, and the sealing member 4 is sleeved on one end of the butterfly plate 3 along the axial direction of the butterfly plate 3. The sliding plate 8 is provided at one end of the butterfly plate 3 where the sealing member 4 is sleeved, and can move along the radial direction and axial direction of the butterfly plate 3 respectively to press and fix the sealing member 4 on the butterfly plate 3.

[0026] In this embodiment, by axially sleeved the seal on the outer circumferential surface of one end of the butterfly plate along the butterfly plate, the convenience of disassembly and assembly of the seal can be improved. At the same time, the sliding plate can be set to achieve compression and fixation of the seal, thereby ensuring the connection stability between the seal and the butterfly plate, and further improving the convenience of disassembly and assembly of the seal.

[0027] Combination Figure 5 As shown, in the butterfly valve of this embodiment, a track plate 9 is further provided. The track plate 9 is slidably arranged on the butterfly plate 3 along the axial direction of the butterfly plate 3, and the sliding plate 8 is arranged on the track plate 9 and can reciprocate radially along the track arranged on the track plate 9 for the butterfly plate 3.

[0028] At this time, by controlling the reciprocating movement of the track plate along the axial direction of the butterfly plate, the sliding plate can be driven to reciprocate along the axial direction of the butterfly plate, thereby forming an axial compression and fixation on the seal, and by controlling the movement of the sliding plate relative to the track plate, that is, the movement along the radial direction of the butterfly plate, the covering amount of the seal along the radial direction of the butterfly plate can be adjusted, so that the sealing ring is not blocked along the axial direction of the butterfly plate, so that the sealing ring can be pulled out horizontally along the axial direction of the butterfly plate at the window, without the need to first expand the sealing ring along the radial direction of the butterfly plate and then pull it out horizontally like the conventional sealing ring installed in the annular groove, thereby improving the convenience of disassembly and assembly of the seal. Moreover, when disassembling the seal, first control the sliding plate to move along the axial direction of the butterfly plate and then move along the radial direction of the butterfly plate, and when installing the seal, first control the sliding plate to move along the radial direction of the butterfly plate and then move along the axial direction of the butterfly plate, so as to avoid damage to the seal during the disassembly and assembly process, and provide a good disassembly and assembly effect for the seal.

[0029] Combination Figure 4 and Figure 5 As shown, in the butterfly valve of this embodiment, a butterfly spring 10, a transmission rod 11, a follower rod 12 and a transmission spring 13 are also provided. The butterfly spring 10 is located between the butterfly plate 3 and the track plate 9 to drive the track plate 9 to move away from the butterfly plate 3 along the axial direction of the butterfly plate 3, that is, to push the track plate 9 along the Figure 5 Move in the right direction as shown. A track limit platform 14 is provided on the track plate 9 to limit the position where the butterfly spring 10 drives the track plate 9 to move. Among them, the track limit platform 14 can be set on the outer circumference of one end of the track plate 9 in the form of a retaining spring. Along the axial direction of the butterfly plate 3, the follower rod 12 is coaxially slidably arranged with the track plate 9, and one end of the follower rod 12 is connected to the first sliding plate 8a in the sliding plate 8 through the first connecting rod 15 as a connecting end to drive the first sliding plate 8a to reciprocate relative to the track plate 9. At the same time, a follower limit platform 16 is provided on the follower rod 12 to limit the position where the connecting end of the follower rod 12 moves in the direction close to the butterfly plate 3. Among them, the limit platform 16 can also be set on the outer circumference of the follower rod 12 in the form of a retaining spring. Along the axial direction of the butterfly plate 3, the transmission rod 11 and the follower rod 12 are coaxially slidably arranged, and one end of the transmission rod 11 is connected to the second sliding plate 8b of the sliding plate 8 through the second connecting rod 17 as a connecting end to drive the first sliding plate 8a to reciprocate relative to the track plate 9. The transmission spring 13 is located between the transmission rod 11 and the follower rod 12, and the connecting end of the transmission rod 11 can overcome the transmission spring 13 and move to abut against the connecting end of the follower rod 12.

[0030] Combination Figure 4 As shown, in this embodiment, the sliding plate 8 is composed of four first sliding plates 8a and four second sliding plates 8b, and four first connecting rods 15 and four second connecting rods 17 are respectively provided. Figure 4As shown, the first sliding plate 8a adopts an arc-shaped plate with two straight sides having an angle of 90°, and the second sliding plate 8b adopts an arc-shaped plate with two parallel straight sides. The first sliding plate 8a and the second sliding plate 8b are alternately arranged along the circumferential direction of the butterfly plate 3. When the first sliding plate 8a and the second sliding plate 8b have completed extending outward, a complete circle is formed, thereby effectively pressing and fixing the seal 4.

[0031] At this time, by controlling the reciprocating movement of the transmission rod along the axial direction of the butterfly plate, under the cooperation of the butterfly spring and the transmission spring, the track plate, the follower rod and the transmission rod can be moved, thereby driving the sliding plate to move the butterfly plate axially and radially, thereby realizing the disassembly, assembly and replacement of the seal on the butterfly plate.

[0032] Combination Figures 1 to 5 As shown, in the butterfly valve of this embodiment, a control head 18, a fixed shaft 19 and a transmission slider 20 are also provided. Among them, the control head 18 is connected to the core valve body 2 and can rotate relative to the core valve body 2. A control groove 21 is provided on the control head 18. When the core valve body 2 is in the first position, the control groove 21 is along the axial direction of the butterfly plate 3, that is, Figure 5 The fixed shaft 19 is fixedly arranged on the core valve body 2, and a fixed pin 22 is arranged on the top of the fixed shaft 19 facing the control groove 21, that is, the fixed pin 22 is arranged along the Figure 5 The top of the transmission slider 20 is slidably connected to the control groove 21 and can reciprocate along the control groove 21. The bottom of the transmission slider 20 is provided with a transmission groove 23 perpendicular to the control groove 21. The fixing pin 22 is slidably connected to the transmission groove 23 and can reciprocate relatively along the transmission groove 23. The transmission slider 20 is provided with an arc-shaped transmission slide 24. The other end of the transmission rod 11 is provided with an arc-shaped rod track 25. The rod track 25 is slidably connected to the transmission slide 24, and the transmission slide 24 is coaxial with the axis of the butterfly plate 3 for normal opening and closing rotation. At this time, the rod track 25 can also form abutment with the follower rod 12 as the transmission rod 11 moves, thereby pushing the follower rod 12 to move.

[0033] At this time, by means of the arc-shaped sliding connection between the rod track and the transmission slide groove, when the core valve body is in the first position and performs normal opening and closing control on the inlet and outlet, the control head can be kept stationary and the transmission rod can not move along the axial direction of the butterfly plate, so that the sliding plate can be kept in a state of pressing and fixing the seal, ensuring the normal operation of the butterfly valve. Conversely, when the core valve body is in the second position to replace the seal, by rotating the control head relative to the fixed shaft, the transmission slider can be reciprocated along the control groove, and the rod track can be used to make the transmission rod move along the axial direction of the butterfly plate, so that the sliding plate can press or release the seal, and the seal replacement operation can be realized.

[0034] Combination Figure 1 and Figure 2 As shown, in the butterfly valve of this embodiment, a driver 26 and a valve stem 27 are also provided. The driver 26 is fixed on the control head 18, one end of the valve stem 27 is connected to the output end of the driver 26, and the other end of the valve stem 27 is connected to the butterfly plate 3. At this time, by controlling the action of the driver, the butterfly plate can be driven to rotate through the valve stem.

[0035] Wherein, in the present embodiment, the driver 26 is selected to be a motor with a built-in brake. In this way, when the driver is stopped and the control head is rotated, the valve stem can be prevented from rotating freely, thereby ensuring the effective replacement of the sealing member.

[0036] Combination Figure 2 As shown, in the butterfly valve of this embodiment, a locking pin 28 and a locking spring 29 are also provided. The locking pin 28 is slidably arranged on the core valve body 2, and the locking spring 29 is located between the locking pin 28 and the core valve body 2 to drive the locking pin 28 to move into the locking hole on the control head 18, so as to fix the control head 18 with the core valve body 2. At this time, the core valve body and the control head can be fixedly connected with the help of the locking pin to ensure the normal operation of the butterfly valve.

[0037] Combination Figure 1 As shown, in the butterfly valve of this embodiment, a switching pin 30 and a switching spring 31 are also provided. The switching pin 30 is slidably arranged on the valve body 1, and the switching spring 31 is located between the switching pin 30 and the valve body 1 to drive the switching pin 30 to move to limit the core valve body 2 to the first position, that is, to limit the core valve body 2 to the first position. Figure 2 Position status shown.

[0038] Combination Figure 1 As shown, in the butterfly valve of this embodiment, a cover plate 32, a cover plate pin 33 and a cover plate spring 34 are also provided. The cover plate 32 can cover the window 7, the cover plate pin 33 is slidably connected to the valve body 1, and the cover plate spring 34 is located between the cover plate pin 33 and the valve body 1 to drive the cover plate pin 33 to move and keep the cover plate 32 fixed to the window 7. At this time, the window can be shielded and covered by the cover plate to protect the internal components.

[0039] Among them, combined Figure 1 As shown, two opposite windows 7 are provided on the valve body 1 of this embodiment, and a cover plate 32 is provided on each of the two windows 7. This can increase the disassembly and assembly space of the sealing member, and provide convenience for disassembly and assembly of the sealing member.

[0040] In addition, combined Figure 2 As shown, an upper baffle 35 is also provided on the valve body 1 of this embodiment. The upper baffle 35 is located above the window 7 and is used to position the core valve body 2 moving toward the second station, so that the core valve body 2 can be quickly and accurately moved to the second station, thereby improving the convenience of disassembly and assembly of the seal.

[0041] Combination Figures 1 to 7 As shown, the specific working process of the butterfly valve in this embodiment is as follows: When the butterfly valve is in normal operation, the switching pin 30 extends under the action of the switching spring 31 to keep the core valve body 2 in the Figure 1 In the first station shown, the locking pin 28 extends under the action of the locking spring 29 to fix the control head 18 to the core valve body 2. At this time, when the butterfly valve needs to be opened or closed, the driver 26 is first started to drive the valve stem 27 to rotate, and the valve stem 27 drives the butterfly plate 3 to follow the rotation. The valve stem 27 is coaxial with the rod track 25 as the axis of rotation of the butterfly plate 3. Since the control head 18 is fixedly connected to the core valve body 2 and remains stationary, the transmission slider 20 remains stationary, so that the transmission rod 11 rotates synchronously with the butterfly plate 3 without moving along the axial direction of the butterfly plate 3, thereby keeping the sliding plate 8 in a state of being pressed and fixed to the seal 4 without changing, and then the driver 26 drives the butterfly plate 3 to rotate through the valve stem 27 to complete the opening or closing, so that the butterfly valve is in a normal working state.

[0042] When the seal 4 needs to be disassembled, the butterfly plate 3 is first moved to the closed state by the driver 26, so that the butterfly valve is in a closed state. Figure 1 The switching pin 30 is then retracted and moved by overcoming the switching spring 31, thereby releasing the lock on the core valve body 2, and then the core valve body 2 is pulled upward to make the core valve body 2 rise to a position abutting against the upper baffle 35. At this time, the core valve body 2 moves to the second working position, and the inlet 5 and the outlet 6 are connected but are not connected to the window 7 due to the obstruction of the core valve body 2. Then, the locking spring 29 is overcome to pull the locking pin 28 out of the control head 18, the connection between the control head 18 and the core valve body 2 is released, and the control head 18 is rotated. Under the action of the built-in brake motor, the valve stem 27 and the control head 18 remain relatively stationary, so that the valve stem 27 rotates synchronously with the control head 18, and then the butterfly plate 3 is driven to rotate through the valve stem 27, and the butterfly plate 3 drives the transmission rod 11 to rotate. At the same time, the control head 18 drives the transmission slider 20 to rotate through the control groove 21, and the transmission slider 20 moves along the control groove 21 under the relative sliding cooperation between the transmission groove 23 and the fixed pin 22, so that the transmission rod 11 is pushed through the rod track 25 and simultaneously extends along the axial direction of the butterfly plate 3, that is, toward Figure 5As shown, the track plate 9 moves in the right direction. At this time, under the restoring force of the butterfly spring 10, the track plate 9 begins to move relative to the butterfly plate 3, thereby driving the sliding plate 8 to move along the axial direction of the butterfly plate 3 and away from the seal 4, releasing the pressing and fixing of the seal 4, and pushing the follower rod 12 and the transmission rod 11 to move through the limit table 16. When the track plate 9 moves to the track limit table 14 and forms abutment with the butterfly plate 3, the track plate 9 stops moving relative to the butterfly plate 3. At this time, under the restoring force of the transmission spring 13, the transmission rod 11 starts to move relative to the follower rod 12. The transmission rod 11 drives the second sliding plate 8b to move relative to the track plate 9 along the radial direction of the butterfly plate 3 through the hinged second connecting rod 17, gradually releasing the partial shielding of the seal 4. When the transmission rod 11 moves to the rod track 25 and forms abutment with the follower rod 12, the transmission rod 11 starts to push the follower rod 12 to move, and the follower rod 12 drives the first sliding plate 8a to move relative to the track plate 9 along the radial direction of the butterfly plate 3 through the hinged first connecting rod 15, and further gradually releases the remaining part of the seal 4, thereby realizing the inward movement of all sliding plates 8 relative to the track plate 9. When the control head 18 completes a 180-degree rotation, the seal 4 is completely exposed and is exactly located at the window 7. After that, the seal 4 on the butterfly plate 3 can be removed through the window 7, and the removal operation of the seal 4 is completed.

[0043] After the new seal 4 is replaced and sleeved on the butterfly plate 3, the control head 18 is rotated in the opposite direction to drive the transmission slider 20 to rotate in the opposite direction, and the transmission groove 23 and the fixed pin 22 are relatively slidably matched to move in the opposite direction along the control groove 21, thereby driving the transmission rod 11 to move along the axial direction of the butterfly plate 3, and the follower rod 12 is driven to move through the transmission spring 13, and then the first sliding plate 8a and the second sliding plate 8b are driven to extend outward relative to the track plate 9 along the radial direction of the butterfly plate 3 through the first connecting rod 15 and the second connecting rod 17. At this time, since the butterfly spring 10 has not been compressed by the track plate 9, the outward movement of the sliding plate 8 will not damage the seal 4. When the first connecting rod 15 and the second connecting rod 17 respectively drive the first After the sliding plate 8a and the second sliding plate 8b are fully extended, the limit platform 16 abuts against the track plate 9, thereby pushing the track plate 9 to overcome the butterfly spring 10 and move, driving the sliding plate 8 to move along the axial direction of the butterfly plate 3 to press the seal 4. When the control head 18 completes 180-degree rotation and reset, the sliding plate 8 just completes the pressing and fixing of the seal 4. The locking pin 28 extends into the control head 18 again under the action of the locking spring 29, and the control head 18 and the core valve body 2 are fixedly connected again, and then the core valve body 2 is pushed downward to reset the core valve body 2 to the first working position. The switching pin 30 positions the core valve body 2 under the restoring force of the switching spring 31, so that the core valve body 2 completes the reset and the replacement operation of the seal 4 is completed.

Claims

1. A butterfly valve, characterized in that: It comprises a valve body, a core valve body, a butterfly plate and a sealing member; the valve body is provided with an inlet, an outlet and a window, the core valve body is arranged in the valve body and can move relative to the valve body, the butterfly plate is arranged on the core valve body and can rotate relative to the core valve body, and the sealing member is arranged on the outer peripheral surface of the butterfly plate and can form a contact seal with the core valve body; The core valve body can move to a first position relative to the valve body, the butterfly plate is located between the outlet and the inlet, the window is not connected to the inlet and the outlet, and the butterfly plate can rotate relative to the core valve body to control the opening and closing between the outlet and the inlet; The core valve body can be moved to a second position relative to the valve body, the butterfly plate is located at the window, the inlet is connected to the outlet and is not connected to the window, and the sealing component can be disassembled and assembled through the window.

2. The butterfly valve according to claim 1, characterized in that: The butterfly valve also includes a sliding plate, and the sealing member is sleeved on one end of the butterfly plate along the axial direction of the butterfly plate; the sliding plate is arranged in the butterfly plate and sleeved on one end of the sealing member, and can move along the radial direction and axial direction of the butterfly plate respectively to press and fix the sealing member on the butterfly plate.

3. The butterfly valve according to claim 2, characterized in that: The butterfly valve further comprises a track plate; the track plate is slidably arranged on the butterfly plate along the axial direction of the butterfly plate; the sliding plate is arranged on the track plate and can reciprocate relative to the track plate along the radial direction of the butterfly plate.

4. The butterfly valve according to claim 3, characterized in that: The butterfly valve also includes a butterfly spring, a transmission rod, a follower rod and a transmission spring; the butterfly spring is located between the butterfly plate and the track plate to drive the track plate to move away from the butterfly plate along the axial direction of the butterfly plate; a track limiter is provided on the track plate to limit the position where the butterfly spring drives the track plate to move; along the axial direction of the butterfly plate, the follower rod is coaxially slidably arranged with the track plate, and one end of the follower rod is connected to the first sliding plate of the sliding plates through the first connecting rod as a connecting end to drive the first sliding plate to reciprocate relative to the track plate The cam is provided with a follower limit platform to limit the position of the connecting end of the follower rod moving toward the direction close to the butterfly plate; along the axial direction of the butterfly plate, the transmission rod and the follower rod are coaxially slidably arranged, and one end of the transmission rod is connected to the second sliding plate in the sliding plate through the second connecting rod as the connecting end to drive the second sliding plate to reciprocate relative to the track plate; the transmission spring is located between the transmission rod and the follower rod, and the connecting end of the transmission rod can overcome the transmission spring and move to form abutment with the connecting end of the follower rod.

5. The butterfly valve according to claim 4, characterized in that: The butterfly valve also includes a control head, a fixed shaft, and a transmission slider; the control head is connected to the core valve body and can rotate relative to the core valve body, the control head is provided with a control groove, and when the core valve body is in the first working position, the control groove is along the axial direction of the butterfly plate; the fixed shaft is fixedly arranged on the core valve body, and the top of the fixed shaft is provided with a fixing pin facing the control groove; the top of the transmission slider is slidably connected with the control groove and can reciprocate along the control groove, the bottom of the transmission slider is provided with a transmission groove perpendicular to the control groove, the fixing pin is slidably connected with the transmission groove and can reciprocate relatively along the transmission groove; the transmission slider is provided with an arc-shaped transmission slide groove, and the other end of the transmission rod is provided with an arc-shaped rod track, the rod track and the transmission slide groove form an arc-shaped sliding connection, the transmission slide groove is coaxial with the axis of the butterfly plate for opening and closing rotation, and the rod track can move to form abutment with the follower rod.

6. The butterfly valve according to claim 5, characterized in that: The butterfly valve also includes a driver and a valve stem; the driver is fixed on the control head, one end of the valve stem is connected to the output end of the driver, and the other end of the valve stem is connected to the butterfly plate.

7. The butterfly valve according to claim 6, characterized in that: The driver uses a motor with a built-in brake.

8. The butterfly valve according to claim 5, characterized in that: The butterfly valve also includes a locking pin and a locking spring; the locking pin is slidably arranged on the core valve body, and the locking spring is located between the locking pin and the core valve body to drive the locking pin to move to fix the control head and the core valve body.

9. The butterfly valve according to any one of claims 1 to 8, characterized in that: The butterfly valve also includes a switching pin and a switching spring; the switching pin is slidably arranged on the valve body, and the switching spring is located between the switching pin and the valve body to drive the switching pin to move to limit the core valve body to the first working position.

10. The butterfly valve according to any one of claims 1 to 8, characterized in that: The butterfly valve also includes a cover plate, a cover plate pin and a cover plate spring; the cover plate can cover the window, the cover plate pin is slidably connected to the valve body, and the cover plate spring is located between the cover plate pin and the valve body to drive the cover plate pin to move and keep the cover plate fixed to the window.

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