A butterfly valve with good sealing

Abstract

The application discloses a butterfly valve with good sealing performance, and belongs to the field of valves. The butterfly valve with good sealing performance comprises a valve body, a valve rod rotatably installed on the valve body, and a butterfly plate connected with the valve rod. The butterfly plate comprises a butterfly frame, side plates connected to the butterfly frame, a cutoff plate slidingly connected to the butterfly frame, and a flexible connecting piece connected between the butterfly frame and the cutoff plate. The butterfly frame is fixedly connected to the valve rod. An inner wall of the valve body is provided with a sealing ring for abutting against the cutoff plate. The inner diameter of the sealing ring gradually decreases from a side close to the butterfly plate to a side far away from the butterfly plate. The butterfly frame is internally provided with a moving mechanism for driving the cutoff plate to move axially along the valve body. The valve rod is provided with an adjusting mechanism for controlling the operation of the moving mechanism. The application has the effect of improving the durability of the butterfly valve and improving the sealing performance of the butterfly valve.

Description

Technical Field

[0001] This application relates to the field of valves, and in particular to a butterfly valve with good sealing performance. Background Technology

[0002] Valves are common components in fluid technology. They control the flow and shut-off of various media in fluid pipelines, making them an indispensable part of pipeline systems. There are many types of valves, among which butterfly valves are one.

[0003] A butterfly valve, also known as a flap valve, has a wide range of applications. It can control gases, water, corrosive media, and liquid metals. A butterfly valve consists of a valve body, valve stem, butterfly plate, and sealing ring. By controlling the rotation of the valve stem, the butterfly plate rotates, covering the internal cross-section of the valve body, thus blocking the flow of media in the pipeline. Similarly, rotating the butterfly plate removes the cover from the internal cross-section of the valve body, allowing the media to flow freely.

[0004] Because butterfly valves require the butterfly plate to contact the inner wall of the valve body to maintain a shut-off state, the edge of the butterfly plate will wear against the inner wall of the valve body when the butterfly plate is rotated. After long-term use, the butterfly plate will wear out due to severe wear, which will affect the sealing performance of the butterfly valve and thus reduce its durability. Summary of the Invention

[0005] In order to improve the durability of butterfly valves and thus improve their sealing performance, this application provides a butterfly valve with good sealing performance.

[0006] The butterfly valve with good sealing performance provided in this application adopts the following technical solution:

[0007] A butterfly valve with good sealing performance includes a valve body, a valve stem rotatably mounted on the valve body, a butterfly plate connected to the valve stem, and a butterfly plate including a butterfly frame, a side plate connected to the butterfly frame, a stop plate slidably connected to the butterfly frame, and a flexible connector connecting the butterfly frame and the stop plate. The butterfly frame is fixedly connected to the valve stem. A sealing ring for abutting against the stop plate is provided on the inner wall of the valve body. The inner diameter of the sealing ring gradually decreases from the side closer to the butterfly plate to the side farther away from the butterfly plate. A moving mechanism is provided inside the butterfly frame for driving the stop plate to move axially along the valve body. An adjustment mechanism is provided on the valve stem for controlling the operation of the moving mechanism.

[0008] By adopting the above technical solution, under the action of the moving mechanism, the stop plate can move relative to the butterfly frame. After the butterfly plate is in a state of covering the internal cross section of the valve body, the stop plate can move further to abut against the sealing ring. The change of the inner diameter of the sealing ring can adapt to the movement of the stop plate to achieve a tight connection between the sealing ring and the stop plate, thus achieving the sealing of the butterfly valve. The flexible connecting parts can play a role in ensuring the overall sealing of the butterfly valve. Since the method of rotating first and then sealing completely is adopted, a gap can be left between the stop plate and the inner wall of the valve body, reducing the wear caused by the rotation of the stop plate, thereby improving the durability of the butterfly valve and thus improving the sealing performance of the butterfly valve.

[0009] Optionally, the moving mechanism includes a rotating seat and an eccentric cam rotatably mounted on the butterfly frame. The edges of the rotating seat and the eccentric cam are provided with meshing teeth that engage with each other. The eccentric cam is connected to the stop plate.

[0010] By adopting the above technical solution, the rotation of the rotating seat can be controlled, and the eccentric cam can be driven to rotate through the meshing teeth. Since the rotation axis of the eccentric cam is set eccentrically, it can drive the stop plate connected to the eccentric cam to move, thereby bringing the stop plate closer to the sealing ring and achieving sealing.

[0011] Optionally, the adjustment mechanism includes a control rod passing through the valve stem, a fixing block connected to the side wall of the control rod, and a transfer block connected to the control rod. The fixing block and the transfer block are both polygonal blocks. The valve stem has a circular groove and a control groove that cooperates with the fixing block. The rotating seat has a transfer groove that cooperates with the transfer block.

[0012] By adopting the above technical solution and adjusting the position of the control lever, the fixed block can be matched with the control groove or the transfer block can be matched with the transfer groove, thereby allowing the valve stem to be rotated or the rotating seat to be rotated.

[0013] Optionally, the fixing block is engaged with the control slot, and the transfer block is engaged with the transfer slot.

[0014] By adopting the above technical solution, the snap-fit ​​method can improve the stability when the fixing block and the control groove are engaged, and the friction generated by the snap-fit ​​can maintain the position of the control rod, effectively preventing the control rod from moving due to gravity.

[0015] Optionally, the cross-sectional area of ​​the circular groove is larger than the cross-sectional area of ​​the fixing block.

[0016] By adopting the above technical solution, it is easy for the fixing block to enter the circular groove, and the fixing block does not contact the valve stem in the circular groove, so that the valve stem does not move when the rotating seat is controlled to rotate.

[0017] Optionally, the flexible connector is a wavy, extended annular sealing strip, with both sides of the sealing strip connected to the stop plate and the butterfly frame, respectively.

[0018] By adopting the above technical solution, the sealing strip can prevent the medium from entering the interior of the butterfly plate, thereby ensuring the integrity of the butterfly plate.

[0019] Optionally, the stop plate includes a fixed frame connected to the flexible connector and a rotating baffle plate rotatably connected to the fixed frame. The fixed frame is slidably connected to a slider, which is rotatably connected to the eccentric cam. Both the slider and the rotating baffle plate are provided with meshing teeth. Both the fixed frame and the rotating baffle plate abut against the sealing ring. The rotating baffle plate has multiple fitting blocks on one side away from the valve stem, and the sealing ring has multiple fitting grooves that engage with the fitting blocks.

[0020] By adopting the above technical solution, while the eccentric cam pushes the stop plate closer to the sealing ring, the rotation of the eccentric cam causes the slider to slide, and under the action of the meshing teeth, it drives the rotating baffle to rotate, thereby causing the fitting block to engage with the fitting groove, increasing the connection area between the stop plate and the sealing ring, and also promoting the stop plate to further press against the sealing ring, thus improving the sealing degree of the butterfly valve.

[0021] Optionally, the fixed frame has a straight groove, and the slider is slidably connected to the straight groove.

[0022] By adopting the above technical solution, the straight groove allows the slider to slide, and the sliding path of the slider can be controlled through the straight groove, thereby controlling the rotation range of the eccentric cam.

[0023] Optionally, the valve stem is provided with a limit rod, and the stop plate is provided with a limit cylinder sleeved on the limit rod.

[0024] By adopting the above technical solution, the cooperation between the limiting rod and the limiting cylinder can guide the movement and rotation of the rotating baffle, thereby improving the stability of the rotating baffle.

[0025] Optionally, one end of the control lever extends through the valve stem and is fixedly connected to a handwheel.

[0026] By adopting the above technical solution, it is easier to apply force to the control rod, thereby better controlling the rotation of the valve rod or the operation of the moving mechanism.

[0027] In summary, this application has the following beneficial effects:

[0028] 1. Under the action of the moving mechanism, the stop plate can move relative to the butterfly frame. After the butterfly plate is in a state of covering the internal cross section of the valve body, the stop plate can move further to abut against the sealing ring. The change of the inner diameter of the sealing ring can adapt to the movement of the stop plate to achieve a tight connection between the sealing ring and the stop plate, thereby achieving the sealing of the butterfly valve. The flexible connecting part can play a role in ensuring the overall sealing of the butterfly valve. Since the method of rotating first and then sealing completely is adopted, a gap can be left between the stop plate and the inner wall of the valve body, which reduces the wear caused by the rotation of the stop plate, thereby improving the durability of the butterfly valve and thus improving the sealing performance of the butterfly valve.

[0029] 2. The control lever allows for switching between controlling the stop plate to abut against the sealing ring and controlling the butterfly plate to rotate, making operation convenient. The stop plate includes a fixed frame and a rotating baffle plate that is rotatably connected to the fixed frame. The rotating baffle plate is provided with a fitting groove that mates with the sealing ring, improving the sealing degree when the stop plate abuts against the sealing ring, thereby further improving the sealing stability. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of an embodiment of the butterfly valve in this application.

[0031] Figure 2 This is a cross-sectional structural diagram of an embodiment of the butterfly valve in this application.

[0032] Figure 3 This is a partial structural diagram of the moving mechanism and the stop plate of the butterfly valve embodiment of this application.

[0033] Figure 4 This is a partial structural diagram of the moving mechanism and the stop plate of the butterfly valve embodiment of this application.

[0034] Figure 5 This is a partial structural diagram of the rotating baffle and the interlocking block in an embodiment of the butterfly valve of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Valve body; 11. Sealing ring; 2. Valve stem; 21. Control lever; 22. Handwheel; 23. Fixing block; 231. Control groove; 232. Circular groove; 24. Transfer block; 241. Transfer groove; 3. Butterfly plate; 31. Butterfly frame; 32. Side plate; 33. Flexible connector; 34. Fitting block; 4. Stop plate; 41. Fixing frame; 42. Rotating baffle; 5. Rotating seat; 51. Eccentric cam; 52. Engaging teeth; 53. Straight groove; 54. Slider; 55. Gear; 6. Limiting rod; 61. Limiting cylinder. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0038] This application discloses a butterfly valve with good sealing performance. For example... Figure 1 and Figure 2 As shown, a butterfly valve with good sealing performance includes a valve body 1, a valve stem 2, and a butterfly plate 3. The valve body 1 has a hollow structure. The valve stem 2 is rotatably installed on the valve body 1. The butterfly plate 3 is connected to the valve stem 2. The valve stem 2 is located in the middle of the butterfly plate 3. When the medium in the pipeline flows through the valve body 1 and it is necessary to stop the medium, the valve stem 2 is rotated, which drives the butterfly plate 3 to rotate and cover the radial section of the valve body 1, thereby achieving the effect of shutting off the medium.

[0039] like Figure 2 As shown, the inner wall of the valve body 1 is provided with an annular sealing ring 11. The sealing ring 11 is made of rubber and is in the shape of a hollow frustum. Specifically, when the butterfly plate 3 covers the radial section of the valve body 1, the inner diameter of the sealing ring 11 gradually decreases from the side closer to the butterfly plate 3 to the side farther away from the butterfly plate 3.

[0040] like Figure 2 and Figure 3 As shown, the butterfly plate 3 includes a butterfly frame 31, side plates 32, a stop plate 4, and a flexible connector 33. Specifically, the butterfly frame 31 is a hollow frame structure with an arc-shaped cross-section to effectively avoid interference between the butterfly plate 3 and the inner wall of the valve body 1. The valve stem 2 passes through and is fixed inside the butterfly frame 31. Both the side plates 32 and the stop plate 4 are circular plates, connected to the two sides of the butterfly frame 31 respectively. The flexible connector 33 connects the stop plate 4 and the butterfly frame 31, making the butterfly plate 3 as a whole disc. The flexible connector 33 is specifically a sealing strip made of rubber. The sealing strip is annular and extends in a wavy shape, giving it a certain deformation space. One side of the sealing strip is fixedly connected to the edge of the stop plate 4, and the other side is fixedly connected to the butterfly frame 31, thus making the butterfly plate 3 as a whole a sealed structure and allowing the stop plate 4 to have movable space relative to the butterfly frame 31.

[0041] In order to control the movement of the stop plate 4 relative to the butterfly frame 31, a moving mechanism is provided inside the butterfly frame 31. The moving mechanism includes a rotating seat 5 and an eccentric cam 51. The rotating seat 5 is rotatably mounted on the butterfly frame 31 and located below the valve stem 2. The eccentric cam 51 is rotatably mounted on the butterfly frame 31 and located between the rotating seat 5 and the stop plate 4. The edge of the rotating seat 5 and part of the edge of the eccentric cam 51 are fixed with meshing teeth 52. The rotating seat 5 and the eccentric cam 51 mesh with each other through the meshing teeth 52, so that when the rotating seat 5 rotates, it can drive the eccentric cam 51 to rotate.

[0042] like Figure 3 and Figure 4As shown, the stop plate 4 includes a fixed frame 41 and a rotating baffle 42. The fixed frame 41 is annular and is fixedly connected to the sealing strip. The fixed frame 41 is rotatably connected to the rotating baffle 42. The rotating baffle 42 is circular and is used to stop the medium in the pipeline. The fixed frame 41 has a horizontally opened straight groove 53, and a slider 54 is slidably connected to the straight groove 53. The sliding direction of the slider 54 is perpendicular to the rotation axis of the eccentric cam 51. The slider 54 is rotatably connected to the eccentric cam 51. When the eccentric cam 51 rotates, it drives the slider 54 to slide along the straight groove 53. At the same time, due to the eccentric setting of the rotation axis, the eccentric cam 51 generates a thrust on the fixed frame 41, causing the fixed frame 41 and the rotating baffle 42 to move axially along the valve body 1 and approach the sealing ring 11. Then the rotating baffle 42 and the fixed frame 41 abut against the sealing ring 11, thereby achieving the sealing of the radial section inside the valve body 1. During the rotation of the butterfly plate 3, a gap can be left between the butterfly plate 3 and the inner wall of the valve body 1. After the butterfly plate 3 rotates to the predetermined position, the stop plate 4 is moved and the rotating baffle 42 abuts against the sealing ring 11, thereby reducing the wear between the butterfly plate 3 and the inner wall of the valve body 1, improving the durability of the butterfly valve, and thus improving the sealing performance of the butterfly valve.

[0043] like Figure 3 and Figure 5 As shown, both the slider 54 and the rotating baffle 42 are fixed with meshing teeth 55. When the eccentric cam 51 rotates and drives the slider 54 to slide, the rotating baffle 42 is driven to rotate through the meshing teeth 55. A plurality of fitting blocks 34 are fixed on the side of the rotating baffle 42 away from the valve stem 2. The fitting blocks 34 are distributed circumferentially along the rotating baffle 42 and protrude in the direction of rotation of the rotating baffle 42. The inner wall of the sealing ring 11 is provided with a plurality of fitting grooves circumferentially. Before the rotating baffle 42 approaches the sealing ring 11, the fitting blocks 34 are offset from the fitting grooves. During the process of the rotating baffle 42 pressing against the sealing ring 11, the slider 54 drives the rotating baffle 42 to rotate, so that the fitting blocks 34 are engaged in the fitting grooves, thereby increasing the connection area between the rotating baffle 42 and the sealing ring 11 and improving the sealing degree between the stop plate 4 and the sealing ring 11.

[0044] A limit rod 6 is fixed to the side wall of the valve stem 2, and a hollow limit cylinder 61 is fixed to the rotating baffle 42. The limit cylinder 61 is sleeved on the limit rod 6. Furthermore, the limit cylinder 61 can be rotatably connected to and slidably connected to the limit rod 6, thereby guiding the movement and rotation of the rotating baffle 42.

[0045] like Figure 2 and Figure 3As shown, in order to control the operation of the moving mechanism, the valve stem 2 is provided with an adjustment mechanism, which includes a control rod 21, a fixing block 23, and a transfer block 24. The valve stem 2 has a hollow internal structure. The control rod 21 passes through the valve stem 2, and one end of the control rod 21 protrudes from the valve stem 2 and is fixedly connected to a handwheel 22. The inner wall of the valve stem 2 has interconnected circular grooves 232 and control grooves 231. The control groove 231 is located above the circular groove 232. The cross-section of the circular groove 232 is circular, and the cross-section of the control groove 231 is square. The fixing block 23 is fixedly connected to the side wall of the control rod 21. The fixing block 23 is a square block, and the cross-sectional area of ​​the circular groove 232 is larger than the cross-sectional area of ​​the fixing block 23. The transfer block 24 is fixed to the end of the control rod 21 near the rotating seat 5. The transfer block 24 is a square block, and the rotating seat 5 has a transfer groove 241, which is a square groove.

[0046] When it is necessary to control the rotation of the butterfly plate 3, the moving control lever 21 causes the fixed block 23 to engage with the control groove 231, so that when the control lever 21 is rotated, the valve stem 2 can be rotated, thereby controlling the rotation of the butterfly plate 3. When it is necessary to control the operation of the moving mechanism, the moving control lever 21 causes the transfer block 24 to engage with the transfer groove 241, so that when the control lever 21 is rotated, the rotating seat 5 can be rotated. At this time, the fixed block 23 is located in the circular groove 232 and therefore will not drive the valve stem 2 to rotate, thus only controlling the operation of the moving mechanism and controlling the movement of the stop plate 4.

[0047] The implementation principle of a butterfly valve with good sealing performance in this application embodiment is as follows:

[0048] When it is necessary to shut off the medium in the pipeline, the control lever 21 is moved, the fixing block 23 is engaged with the control groove 231, the handwheel 22 is turned, the valve stem 2 is rotated, the butterfly plate 3 is rotated 90°, and the butterfly plate 3 covers the radial section inside the valve body 1; then the control lever 21 is moved downward, the fixing block 23 is disengaged from the control groove 231, the transfer block 24 is engaged with the transfer groove 241, the handwheel 22 is turned, the rotating seat 5 is rotated, and under the transmission action of the eccentric cam 51 and the slider 54, the shut-off plate 4 is moved closer to the sealing ring 11, and at the same time the rotating baffle 42 is rotated, finally the rotating baffle 42 is pressed against the sealing ring 11, and the fitting block 34 is fitted into the fitting groove, so as to achieve the sealing of the butterfly valve.

[0049] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this specific embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A butterfly valve with good sealing performance, comprising a valve body (1), characterized in that: The valve body (1) is rotatably mounted with a valve stem (2), the valve stem (2) is connected to a butterfly plate (3), the butterfly plate (3) includes a butterfly frame (31), a side plate (32) connected to the butterfly frame (31), a stop plate (4) slidably connected to the butterfly frame (31), and a flexible connector (33) connected between the butterfly frame (31) and the stop plate (4). The butterfly frame (31) is fixedly connected to the valve stem (2). The inner wall of the valve body (1) is provided with a sealing ring (11) for abutting against the stop plate (4). The inner diameter of the sealing ring (11) gradually decreases from the side close to the butterfly plate (3) to the side away from the butterfly plate (3). The butterfly frame (31) is provided with a moving mechanism for driving the stop plate (4) to move along the axial direction of the valve body (1). The valve stem (2) is provided with an adjustment mechanism for controlling the operation of the moving mechanism. The moving mechanism includes a rotating seat (5) and an eccentric cam (51) rotatably mounted on the butterfly frame (31). The edges of the rotating seat (5) and the eccentric cam (51) are provided with meshing teeth (52) that mesh with each other. The eccentric cam (51) is connected to the stop plate (4). The adjustment mechanism includes a control rod (21) passing through the valve stem (2), a fixing block (23) connected to the side wall of the control rod (21), and a transfer block (24) connected to the control rod (21). The fixing block (23) and the transfer block (24) are both polygonal blocks. The valve stem (2) has a circular groove (232) and a control groove (231) that cooperates with the fixing block (23). The rotating seat (5) has a transfer groove (241) that cooperates with the transfer block (24).

2. The butterfly valve with good sealing performance according to claim 1, characterized in that: The fixing block (23) is engaged with the control groove (231), and the transfer block (24) is engaged with the transfer groove (241).

3. A butterfly valve with good sealing performance according to claim 1, characterized in that: The cross-sectional area of ​​the circular groove (232) is greater than the cross-sectional area of ​​the fixed block (23).

4. A butterfly valve with good sealing performance according to claim 1, characterized in that: The flexible connector (33) is a wavy, extended annular sealing strip, with both sides of the sealing strip connected to the stop plate (4) and the butterfly frame (31) respectively.

5. A butterfly valve with good sealing performance according to claim 1, characterized in that: The stop plate (4) includes a fixed frame (41) connected to the flexible connector (33) and a rotating baffle (42) rotatably connected to the fixed frame (41). The fixed frame (41) is slidably connected to a slider (54). The slider (54) is rotatably connected to the eccentric cam (51). Both the slider (54) and the rotating baffle (42) are provided with meshing teeth (55). The fixed frame (41) and the rotating baffle (42) abut against the sealing ring (11). The rotating baffle (42) has multiple fitting blocks (34) on one side away from the valve stem (2). The sealing ring (11) has multiple fitting grooves that engage with the fitting blocks (34).

6. A butterfly valve with good sealing performance according to claim 5, characterized in that: The fixed frame (41) has a straight groove (53), and the slider (54) is slidably connected to the straight groove (53).

7. A butterfly valve with good sealing performance according to claim 1, characterized in that: The valve stem (2) is provided with a limit rod (6), and the stop plate (4) is provided with a limit cylinder (61) sleeved on the limit rod (6).

8. A butterfly valve with good sealing performance according to claim 1, characterized in that: One end of the control lever (21) extends through the valve stem (2) and is fixedly connected to a handwheel (22).

Images