Butterfly valve capable of preventing valve rod from flying out

Abstract

The invention relates to a butterfly valve capable of preventing a valve rod from flying out, which comprises a valve body and further comprises a butterfly plate arranged in the valve body; the anti-flying-out mechanism is arranged at the top of the butterfly plate and comprises an inserting groove, the inserting groove is formed in the top of the butterfly plate, a valve rod is inserted into the inserting groove, a cavity is formed in the valve rod, pressing blocks penetrate through the tops of the two sides of the valve rod, concave plates are fixed to the ends, located in the cavity, of the pressing blocks, and a spring is fixed to the top between the two concave plates. The valve rod can stretch into the butterfly plate, the arc-shaped clamping plates on the two sides of the valve rod are clamped into the arc-shaped clamping grooves, so that the valve rod is connected with the butterfly plate, the butterfly plate can be used for limiting the valve rod, the situation that the valve rod flies out can be avoided, and when the valve rod needs to be dismantled, the valve rod can be conveniently detached, and the valve rod can be conveniently detached. And the arc-shaped clamping plate can be moved by pressing the pressing block, so that the arc-shaped clamping plate is separated from the arc-shaped clamping groove, the valve rod and the butterfly plate are conveniently disassembled and assembled, and multiple limiting rods do not need to be arranged.

Description

Technical Field

[0001] This invention relates to the field of butterfly valves, specifically a butterfly valve that prevents the valve stem from flying off. Background Technology

[0002] Due to limitations in the design of the upper stem structure, butterfly valves typically employ a grooved design on the stem. This is achieved through a split ring, packing gland, and packing plate to tighten and limit the stem, preventing it from flying out. However, this type of anti-flyout structure still allows the stem to fly out of the valve body during maintenance due to internal pressure, posing a safety hazard to on-site personnel. Furthermore, the grooved stem reduces its original strength, causing it to fall below the design safety strength, which negatively impacts product performance.

[0003] According to publicly available patent 202323000425.6, a butterfly valve stem anti-flyout structure includes a shell, a top shell, a valve stem body, a limiting sleeve, a bearing, a mounting base, a limiting seat, and a bottom cover. The top shell is bolted to the top of the shell, and the limiting sleeve is bolted to the inside of the top shell. A bearing is bolted to the bottom of the limiting sleeve, and the outer wall of the valve stem body is bolted to the middle of the bearing. A first limiting rod is slidably connected to the outer wall of the valve stem body, located at the bottom of the bearing. By providing a first and second limiting rod on the upper and lower sides of the valve stem body inside the valve, it is ensured that the valve stem will not fly out when the pin is completely ineffective. The anti-flyout device is designed for easy installation, good rigidity, and wear resistance. However, in realizing this invention, the inventors discovered that at least the following problems remain unresolved in the prior art: although providing a first and second limiting rod on the upper and lower sides of the valve stem body inside the valve ensures that the valve stem will not fly out when the pin is completely ineffective, the anti-flyout device is designed for easy installation, good rigidity, and wear resistance. Convenient, rigid, and wear-resistant, traditional butterfly valves with stem-flyout prevention systems have first and second limit rods on both sides of the valve stem body to prevent it from flying out. This method of using limit rods to prevent stem flight results in the need to manually remove multiple limit rods before the valve stem body can be disassembled, making valve stem removal cumbersome. Furthermore, the valve's sealing ring needs to seal the connection between the valve plate and the valve body through the connecting pipe. Over time, the sealing ring may loosen, affecting the valve body's sealing performance. Therefore, a new technical solution is needed to address these issues. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art, adapt to practical needs, and provide a butterfly valve that prevents the valve stem from flying out. This solves the problem of current traditional butterfly valves that prevent valve stem from flying out. These valves have a first limiting rod and a second limiting rod on the upper and lower sides of the valve stem body to prevent the valve stem from flying out. However, this method of using limiting rods to prevent the valve stem body from flying out results in the valve stem being removed manually, requiring the removal of multiple limiting rods before the valve stem body can be disassembled, making valve stem removal cumbersome. Furthermore, the valve's sealing ring needs to seal the connection between the valve plate and the valve body pipe. Over time, the sealing ring may loosen, affecting the valve body's sealing performance.

[0005] To achieve the objective of this invention, the technical solution adopted is as follows: A butterfly valve designed to prevent valve stem ejection is provided, comprising a valve body, and further comprising:

[0006] The butterfly plate is located inside the valve body;

[0007] An anti-flyout mechanism is provided on the top of the butterfly plate. The anti-flyout mechanism includes a slot. The slot is provided on the top of the butterfly plate. A valve stem is inserted into the slot. A cavity is provided inside the valve stem. Pressure blocks pass through the top of both sides of the valve stem. A concave plate is fixed to one end of the pressure block located in the cavity. A spring is fixed between the top of the two concave plates. An arc-shaped retaining plate is fixed to one end of the bottom of the concave plate through the cavity and the valve stem.

[0008] Both sides of the slot are provided with arc-shaped slots, and arc-shaped plates are engaged inside the arc-shaped slots.

[0009] Preferably, a lower bushing is installed at the bottom of the valve body, a rotary joint is installed inside the lower bushing, a connecting pipe is connected to the bottom of the rotary joint, and a pipe cap is detachably connected to the bottom of the connecting pipe through the lower bushing.

[0010] Preferably, the butterfly plate has an arc-shaped cavity inside, the bottom of the arc-shaped cavity is connected to a rotating tube, and the bottom of the rotating tube is connected to a rotating joint.

[0011] Preferably, the front end of the butterfly plate has multiple water outlet holes in an arc shape, and water outlet pipes are installed inside the multiple water outlet holes, with an arc-shaped cavity connected to the rear end of the water outlet pipes.

[0012] Preferably, a butterfly plate retaining ring is installed inside the valve body, a butterfly plate is provided inside the butterfly plate retaining ring, and a first annular groove is opened on both sides of the inner wall of the butterfly plate retaining ring, and a first airbag ring is installed inside the first annular groove.

[0013] Preferably, a second annular groove is provided on both sides of the inner wall of the valve body, and a second airbag ring is installed inside the second annular groove. Grooves are provided on both the upper and lower ends of the valve body, and a miniature air pump is installed inside the groove. One end of the miniature air pump passes through the second annular groove and is connected to the second airbag ring. The other end of the miniature air pump is connected to a first air pipe, and the end of the first air pipe away from the miniature air pump passes through the valve body.

[0014] Preferably, the second airbag ring has a second air tube connected to both the upper and lower ends on one side, and the end of the second air tube away from the second airbag ring is connected to the first airbag ring.

[0015] Preferably, a sealing ring is installed inside the valve body, a sealing ring pressure plate is installed outside the sealing ring, a spring washer is installed outside the sealing ring pressure plate, and a cylindrical pin is installed inside the valve body.

[0016] Preferably, an upper bushing is installed on the top of the valve body, a packing pad is provided on the top of the upper bushing, packing is provided on the top of the packing pad, a first packing gland is provided on the top of the packing, and a second packing gland is installed on the top of the first packing gland.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. This invention combines a valve stem, an arc-shaped retaining plate, and a concave plate. The valve stem can be inserted into the butterfly plate, and the arc-shaped retaining plates on both sides of the valve stem engage with the arc-shaped retaining grooves, thus connecting the valve stem to the butterfly plate. The butterfly plate can limit the valve stem's movement, preventing it from flying out. When the valve stem needs to be removed, pressing the pressing block moves the arc-shaped retaining plate, disengaging it from the arc-shaped retaining groove, thus facilitating the easy assembly and disassembly of the valve stem and butterfly plate. This eliminates the need for multiple limiting rods, solving the technical problem of traditional butterfly valves that prevent valve stem flight. These valves typically have first and second limiting rods on the upper and lower sides of the valve stem body to prevent flight, which requires manual removal of multiple limiting rods before the valve stem body can be disassembled, making valve stem removal cumbersome.

[0019] 2. This invention, through the combination of a first airbag ring, a second airbag ring, and a second air tube, allows the first and second airbag rings to be respectively positioned on both sides of the butterfly plate retaining ring and the valve body. The expansion of the first and second airbag rings effectively presses and seals the connected pipes and the outer wall of the butterfly plate. Simultaneously, the second air tube connects the first and second airbag rings, enabling simultaneous inflation of the first airbag ring while the second airbag ring inflates. This eliminates the need for multiple inflation devices and solves the technical problem that the valve's sealing ring, which needs to seal the connection between the valve plate and the valve body, can loosen over time, affecting the valve body's sealing performance.

[0020] 3. This invention, through a butterfly plate, an arc-shaped cavity, and a rotary joint, allows for the connection of an external water pipe to the connecting pipe when cleaning the inside of the valve body is required. External water is then introduced into the arc-shaped cavity and sprayed out from the surface of the butterfly plate through multiple outlet pipes, thus inflating the inside of the valve body. Furthermore, the rotary joint ensures that water continues to flow during the rotation of the butterfly plate, allowing for the rotating spraying of water to rinse and clean different areas within the valve body. This enables cleaning of the valve body's interior without disassembling it, significantly improving the ease of cleaning. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the butterfly plate and valve stem of the present invention;

[0023] Figure 3 This is a schematic diagram of the internal structure of the valve body of the present invention;

[0024] Figure 4 This is a cross-sectional view of the present invention.

[0025] In the diagram: 1. Valve body; 2. Lower bushing; 3. Sealing ring pressure plate; 4. Sealing ring; 5. Butterfly plate retaining ring; 6. Butterfly plate; 7. Valve stem; 8. Cylindrical pin; 9. Upper bushing; 10. Spring washer; 11. Packing pad; 12. Packing; 13. First packing gland; 131. Second packing gland; 20. Water outlet; 21. Water outlet pipe; 22. Cavity; 23. Pressure block; 24. Concave plate; 25. Spring; 26. Arc-shaped retaining plate; 27. Arc-shaped retaining groove; 28. Arc-shaped cavity; 29. ​​Second air pipe; 30. Rotary pipe; 31. Rotary joint; 32. Connecting pipe; 33. Pipe cap; 34. First air pipe; 35. Miniature air pump; 36. Second annular groove; 37. Second airbag ring; 38. First annular groove; 39. First airbag ring; 40. Groove; 41. Slot. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0027] Example 1: A butterfly valve that prevents the valve stem from flying out, see [reference] Figures 1 to 4 The valve body includes a valve body 1 and a butterfly plate 6, which is disposed within the valve body 1. An anti-flyout mechanism is located on the top of the butterfly plate 6. The anti-flyout mechanism includes a slot 41, which is located on the top of the butterfly plate 6. A valve stem 7 is inserted into the slot 41. A cavity 22 is formed inside the valve stem 7. Pressure blocks 23 penetrate both sides of the valve stem 7. A concave plate 24 is fixed to one end of the pressure block 23 located within the cavity 22. A spring 25 is fixed between the two concave plates 24 at the top. The bottom of the concave plate 24... One end of the valve stem 7 is fixed with an arc-shaped retaining plate 26 through the cavity 22; arc-shaped slots 27 are provided on both sides of the slot 41, and arc-shaped retaining plates 26 are engaged inside the slots 27. When it is necessary to install the valve stem 7 and the butterfly plate 6, the valve stem 7 is simply inserted into the slot 41 at the top of the butterfly plate 6. The spring force of the spring 25 can drive the two concave plates 24 to move to both sides. When the arc-shaped retaining plate 26 moves to the position of the arc-shaped slot 27, it can make the arc-shaped retaining plate 26... The valve stem 7 is fixed in place by entering the arc-shaped groove 27. The butterfly plate 6 limits the valve stem 7, preventing it from flying out. When the valve stem 7 is needed, two fingers are used to press the two pressure blocks 23. The two pressure blocks 23 will compress the spring 25, causing the pressure blocks 23 to move the concave plate 24. When the concave plate 24 moves, it will move the arc-shaped clamping plate 26 into the cavity 22, thereby causing the arc-shaped clamping plate 26 to disengage from the arc-shaped groove 27. After the arc-shaped clamping plate 26 disengages from the arc-shaped groove 27, the valve stem 7 can be directly pulled out. This solves the problem of traditional butterfly valves that prevent the valve stem 7 from flying out. The valve stem 7 has a first limit rod and a second limit rod on the upper and lower sides to prevent it from flying out. However, this method of setting limit rods to prevent the valve stem 7 from flying out requires manually removing multiple limit rods before the valve stem 7 can be removed, making the removal of the valve stem 7 cumbersome.

[0028] For details, see Figure 2 The valve body 1 has a lower bushing 2 installed at the bottom. The lower bushing 2 has a rotary joint 31 installed inside. The bottom of the rotary joint 31 is connected to a connecting pipe 32. The bottom of the connecting pipe 32 passes through the lower bushing 2 and is detachably connected to a pipe cover 33.

[0029] For more details, see Figure 2The butterfly plate 6 has an arc-shaped cavity 28 inside, and a rotating pipe 30 is connected to the bottom of the arc-shaped cavity 28. A rotating joint 31 is connected to the bottom of the rotating pipe 30. When it is necessary to clean the inside of the valve body 1, the external water pipe is connected to the connecting pipe 32, so that external water can be input into the arc-shaped cavity 28 and sprayed out from the surface of the butterfly plate 6 through multiple water outlet pipes 21, thereby inflating the inside of the valve body 1. Moreover, due to the rotating joint 31, the rotating rod can be rotated through the rotating joint 31 while the butterfly plate 6 rotates, so that the water can still flow. This allows the butterfly plate 6 to rotate and spray water through multiple water outlet pipes 21 to rinse and clean different parts of the valve body 1. This allows the inside of the valve body 1 to be cleaned without disassembling the valve body 1, improving the convenience of cleaning the valve body 1.

[0030] Further, see Figure 1 and Figure 2 The front end of the butterfly plate 6 has multiple water outlet holes 20 in an arc shape, and water outlet pipes 21 are installed inside the multiple water outlet holes 20. The rear end of the water outlet pipes 21 is connected to an arc-shaped cavity 28.

[0031] Further, see Figure 3 A butterfly plate retaining ring 5 is installed inside the valve body 1. A butterfly plate 6 is provided inside the butterfly plate retaining ring 5. A first annular groove 38 is provided on both sides of the inner wall of the butterfly plate retaining ring 5. A first airbag ring 39 is installed inside the first annular groove 38.

[0032] It is worth noting that, see Figure 3 The valve body 1 has a second annular groove 36 on both sides of its inner wall. A second airbag ring 37 is installed inside the second annular groove 36. The valve body 1 has grooves 40 on both sides of its upper and lower ends. A miniature air pump 35 is installed inside the grooves 40. One end of the miniature air pump 35 passes through the second annular groove 36 and is connected to the second airbag ring 37. The other end of the miniature air pump 35 is connected to a first air pipe 34. The end of the first air pipe 34 away from the miniature air pump 35 passes through the valve body 1.

[0033] It is worth noting that, see Figure 3The second airbag ring 37 has second air tubes 29 connected to both its upper and lower ends on one side. The end of the second air tube 29 furthest from the second airbag ring 37 is connected to the first airbag ring 39. When it is necessary to inflate the first airbag ring 39 and the second airbag ring 37, multiple miniature air pumps 35 can be activated. These pumps inflate the second airbag ring 37, causing it to expand rapidly. The second airbag ring 37 fits snugly against the tubes, thus increasing the seal. Because the second airbag ring 37 and the first airbag ring 39 are connected by the second air tubes 29, it allows for… Gas is introduced into the first airbag ring 39, and the first airbag ring 39 is inflated directly. When the butterfly plate 6 is closed, the first airbag ring 39 expands and presses against the butterfly plate 6, which can increase the sealing between the butterfly plate 6 and the valve body 1. Moreover, the first airbag ring 39 and the second airbag ring 37 are inflated at the same time, eliminating the need for multiple inflation devices. This solves the technical problem that the valve sealing ring 4 needs to seal the position of the valve plate and the valve body 1 connecting pipe 32. During long-term use, the sealing ring 4 may loosen, affecting the sealing performance of the valve body 1.

[0034] It is worth mentioning that, see Figure 4 A sealing ring 4 is installed inside the valve body 1, a sealing ring pressure plate 3 is installed outside the sealing ring 4, a spring washer 10 is installed outside the sealing ring pressure plate 3, and a cylindrical pin 8 is installed inside the valve body 1.

[0035] It is worth emphasizing that, see Figure 4 The valve body 1 is equipped with an upper bushing 9 on top, a packing gasket 11 is provided on top of the upper bushing 9, a packing 12 is provided on top of the packing gasket 11, a first packing gland 13 is provided on top of the packing 12, and a second packing gland 131 is installed on top of the first packing gland 13.

[0036] When using a butterfly valve that prevents the valve stem from flying out, when installing the valve stem 7 and the butterfly plate 6, simply insert the valve stem 7 into the slot 41 at the top of the butterfly plate 6. The spring force of the spring 25 will cause the two concave plates 24 to move to both sides. When the arc-shaped retaining plate 26 moves to the position of the arc-shaped retaining groove 27, it will enter the arc-shaped retaining groove 27, thereby limiting and fixing the valve stem 7. Using the butterfly plate 6 to limit the valve stem 7 prevents it from flying out. When the valve stem 7 needs to be removed, two fingers should be used to press the two pressure blocks 23 respectively. Block 23 compresses spring 25, causing block 23 to move concave plate 24. As concave plate 24 moves, it moves arc-shaped locking plate 26 into cavity 22, causing arc-shaped locking plate 26 to disengage from arc-shaped locking groove 27. After arc-shaped locking plate 26 disengages from arc-shaped locking groove 27, valve stem 7 can be directly pulled out. When cleaning the inside of valve body 1 is required, connecting external water pipes to connecting pipe 32 allows external water to be input into arc-shaped cavity 28. Water then sprays out from the surface of butterfly plate 6 through multiple outlet pipes 21, thus inflating the inside of valve body 1. Furthermore, due to… Equipped with a rotary joint 31, the butterfly plate 6 rotates while simultaneously rotating a rotating rod via the joint 31, maintaining water flow. This allows the butterfly plate 6 to rotate and spray water from multiple outlet pipes 21, rinsing and cleaning different areas within the valve body 1. This enables cleaning of the valve body 1 without disassembling it, improving its ease of cleaning. When it is necessary to inflate the first airbag ring 39 and the second airbag ring 37, multiple micro air pumps 35 can be activated to inflate the second airbag ring 37. The rapid expansion of the second airbag ring 37, which fits against the pipe, increases the sealing performance. Since the second airbag ring 37 and the first airbag ring 39 are connected by the second air pipe 29, gas can be introduced into the first airbag ring 39, directly inflating the inside of the first airbag ring 39 simultaneously. When the butterfly plate 6 is closed, the first airbag ring 39 expands and presses against the butterfly plate 6, increasing the sealing performance between the butterfly plate 6 and the valve body 1. Moreover, the first airbag ring 39 and the second airbag ring 37 can be inflated simultaneously, eliminating the need for multiple inflation devices.

[0037] In addition, all components designed in this invention are general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods. They can be fully implemented by those skilled in the art, so there is no need to elaborate. The content protected by this invention does not involve improvements to the internal structure and methods.

[0038] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A butterfly valve for preventing valve stem ejection, comprising a valve body (1), characterized in that, Also includes: A butterfly plate (6) is installed inside the valve body (1); An anti-flyout mechanism is provided on the top of the butterfly plate (6). The anti-flyout mechanism includes a slot (41). The slot (41) is provided on the top of the butterfly plate (6). A valve stem (7) is inserted inside the slot (41). A cavity (22) is provided inside the valve stem (7). A pressure block (23) passes through the top of both sides of the valve stem (7). A concave plate (24) is fixed at one end of the pressure block (23) located in the cavity (22). A spring (25) is fixed at the top between the two concave plates (24). An arc-shaped clamping plate (26) is fixed at one end of the bottom of the concave plate (24) through the cavity (22) and the valve stem (7). The slot (41) has arc-shaped slots (27) on both sides inside, and an arc-shaped card plate (26) is engaged inside the arc-shaped slots (27).

2. The butterfly valve for preventing valve stem ejection as described in claim 1, characterized in that, The valve body (1) is fitted with a lower bushing (2) at the bottom. A rotary joint (31) is installed inside the lower bushing (2). A connecting pipe (32) is connected to the bottom of the rotary joint (31). A pipe cap (33) is detachably connected to the bottom of the connecting pipe (32) through the lower bushing (2).

3. A butterfly valve for preventing valve stem ejection as described in claim 1, characterized in that, The butterfly plate (6) has an arc-shaped cavity (28) inside, and the bottom of the arc-shaped cavity (28) is connected to a rotating tube (30), and the bottom of the rotating tube (30) is connected to a rotating joint (31).

4. A butterfly valve for preventing valve stem ejection as described in claim 3, characterized in that, The butterfly plate (6) has multiple water outlet holes (20) in an arc shape at the front end, and water outlet pipes (21) are installed inside the multiple water outlet holes (20). The rear end of the water outlet pipes (21) is connected to an arc-shaped cavity (28).

5. A butterfly valve for preventing valve stem ejection as described in claim 1, characterized in that, The valve body (1) is equipped with a butterfly plate retaining ring (5), and a butterfly plate (6) is provided inside the butterfly plate retaining ring (5). A first annular groove (38) is provided on both sides of the inner wall of the butterfly plate retaining ring (5), and a first airbag ring (39) is installed inside the first annular groove (38).

6. A butterfly valve for preventing valve stem ejection as described in claim 1, characterized in that, The valve body (1) has a second annular groove (36) on both sides of its inner wall. A second airbag ring (37) is installed inside the second annular groove (36). The valve body (1) has grooves (40) on both sides of its upper and lower ends. A miniature air pump (35) is installed inside the groove (40). One end of the miniature air pump (35) passes through the second annular groove (36) and is connected to the second airbag ring (37). The other end of the miniature air pump (35) is connected to a first air pipe (34). The end of the first air pipe (34) away from the miniature air pump (35) passes through the valve body (1).

7. A butterfly valve for preventing valve stem ejection as described in claim 5 or 6, characterized in that, The second airbag ring (37) has a second air tube (29) connected to both the upper and lower ends on one side, and the end of the second air tube (29) away from the second airbag ring (37) is connected to the first airbag ring (39).

8. A butterfly valve for preventing valve stem ejection as described in claim 1, characterized in that, A sealing ring (4) is installed inside the valve body (1), a sealing ring pressure plate (3) is installed outside the sealing ring (4), a spring washer (10) is installed outside the sealing ring pressure plate (3), and a cylindrical pin (8) is installed inside the valve body (1).

9. A butterfly valve for preventing valve stem ejection as described in claim 1, characterized in that, The valve body (1) is equipped with an upper bushing (9) on top, a packing pad (11) is provided on top of the upper bushing (9), a packing pad (12) is provided on top of the packing pad (11), a first packing gland (13) is provided on top of the packing pad (12), and a second packing gland (131) is installed on top of the first packing gland (13).

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