Gate valve rod buffering device

Abstract

The utility model relates to the technical field of fluid control, and provides a buffer device for a valve rod of a gate valve. The boss is used for being connected with the valve body; accommodating grooves are formed in the ends, close to the bosses, of the limiting blocks; the buffering assembly comprises a buffering table and an elastic buffering piece, the buffering table is arranged on the limiting block in a sliding mode, the buffering table comprises a limiting part and a stress part which are connected with each other, one end of the stress part penetrates out of the inner side wall of the containing groove, the limiting part is used for abutting against the inner side wall of the containing groove, and the elastic buffering piece is located in the containing groove; the connecting piece is used for connecting the limiting block and the boss. The valve rod can be prevented from deforming in the use process of the gate valve, so that the service life of the gate valve is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of fluid control, and in particular to a gate valve stem buffer device. Background Art

[0002] Gate valve is a commonly used type of valve, mainly used to control the flow of fluids, such as opening and closing the medium channel in the pipeline system. Gate valve is mainly composed of valve body, valve cover, valve stem, gate and sealing packing. The valve body is the main part of the valve, through which the fluid flows; the valve cover usually cooperates with the valve body to close the inside of the valve; the valve stem is used to connect the handwheel and the gate, and the gate is controlled by rotating the handwheel or other driving methods. The gate is a key component of the valve, which controls the flow of fluids by lifting and lowering; the sealing packing is used to prevent the fluid from leaking along the valve stem. The gate valve controls the flow of fluids by lifting and lowering the gate. When the gate is completely sealed with the valve seat, the fluid is cut off; when the gate is raised, the fluid can flow freely.

[0003] The gate valve stem is mainly divided into two types: lifting type (rising stem) or rotating type (non-rising stem). When fast electric drive, pneumatic drive, or hydraulic drive is used to control the lifting of the valve stem, the valve stem will generate a large impact force at the moment of closing due to the fast switching speed. After multiple actions, the valve stem can easily be deformed, shortening the service life of the gate valve. Utility Model Content

[0004] In order to prevent the valve stem from deforming during the use of the gate valve and to extend the service life of the gate valve, the present application provides a gate valve stem buffer device.

[0005] The present application provides a gate valve stem buffer device, which adopts the following technical solution:

[0006] The gate valve stem buffer device comprises:

[0007] A boss, used for connecting with the valve body;

[0008] A limit block, wherein an end of the limit block close to the boss is provided with a receiving groove;

[0009] A buffer assembly, comprising a buffer platform and an elastic buffer member, wherein the buffer platform is slidably arranged on the limit block, the buffer platform comprises a limit portion and a force-bearing portion connected to each other, one end of the force-bearing portion passes through the inner side wall of the receiving groove, the limit portion is used to abut against the inner side wall of the receiving groove, and the elastic buffer member is located in the receiving groove;

[0010] A connecting piece is used to connect the limit block and the boss.

[0011] By adopting the above technical solution, when in use, it is necessary to install the boss at the center of the bottom of the valve body, and make the buffer table located below the gate plate; when the valve is closed quickly, due to the fast closing speed, after the gate plate contacts the valve body, the valve stem and the gate plate will be subjected to a large impact load, and the impact load is transmitted to the buffer table, the buffer table slides, and the impact load is transmitted to the elastic buffer part. The coordinated use of the buffer table and the elastic buffer part can effectively absorb and reduce the impact force caused by the rapid movement of the valve stem, thereby protecting the valve stem from being easily damaged; the installation of the limit block and the boss is realized by the connecting piece, so that the buffer assembly is conveniently installed in the accommodating groove. When the buffer table slides in the accommodating groove, the limit part in the buffer table can be against the inner wall of the accommodating groove to prevent the buffer table from detaching from the limit block, so as to improve the connection stability between the buffer table and the limit block.

[0012] Optionally, the connecting member includes a screw, one end of which is inserted into the boss along the limiting block and is threadedly connected to the boss.

[0013] By adopting the above technical solution, the connection between the boss and the limit block is achieved by screws, thereby achieving a stable connection between the limit block and the boss, ensuring the stability and reliability of the buffer device during use.

[0014] Optionally, the connecting member includes a plug bolt, and the plug bolt includes a bolt head, a plug rod connected to the bolt head, and an elastic pawl fixed to the plug rod;

[0015] The limit block is provided with a first plug hole for accommodating the plug rod, the boss is provided with a second plug hole for accommodating the plug rod, and the inner side wall of the second plug hole is provided with a clamping groove for the elastic pawl to clamp.

[0016] By adopting the above technical solution, the design of the plug bolt provides a quick and firm connection method, which is convenient for installation, disassembly and maintenance.

[0017] Optionally, the cross-sectional area of ​​the plug rod gradually decreases in a direction away from the bolt head.

[0018] By adopting the above technical solution, the cross-sectional area of ​​the plug rod gradually decreases in the direction away from the bolt head, making it easier for the plug bolt to be inserted into the socket, thereby improving installation efficiency.

[0019] Optionally, the distance between the elastic pawl and the plug rod gradually increases towards the direction approaching the bolt head.

[0020] By adopting the above technical solution, the distance between the elastic pawl and the plug rod gradually increases towards the bolt head, thereby enhancing the clamping stability between the elastic pawl and the clamping groove, thereby ensuring the firmness of the connection.

[0021] Optionally, the screw includes a nail cap and a screw rod connected to each other, the limiting block is provided with a recessed groove for the nail cap to be clamped, a spring washer is arranged in the recessed groove, and the spring washer is sleeved on the screw rod.

[0022] By adopting the above technical solution, the spring washer is sleeved on the screw rod to enhance the stability of the screw connection and prevent loosening.

[0023] Optionally, the elastic buffer member includes a butterfly spring, and the butterfly spring abuts between the limiting portion and the boss.

[0024] By adopting the above technical solution, the butterfly spring abuts between the limiting portion and the boss, and uses its special shape and structure to provide good elasticity and buffering effects.

[0025] Optionally, the elastic buffer component includes a buffer tension spring, which is sleeved outside the force-bearing portion and connected between the limiting portion and the inner side wall of the accommodating groove.

[0026] By adopting the above technical solution and setting the buffer tension spring, the impact force can be further absorbed and dispersed, thereby enhancing the buffering effect.

[0027] Optionally, a waterproof layer is provided on the outer surface of the limiting block and the boss.

[0028] By adopting the above technical solution, a waterproof layer is provided on the outer surface of the limit block and the boss to improve the anti-corrosion performance of the limit block and the boss and extend the service life.

[0029] Optionally, the boss is made of hard and wear-resistant material.

[0030] By adopting the above technical solution, the boss is made of hard and wear-resistant material, ensuring that the buffer table has sufficient strength and wear resistance during use, thereby improving the durability of the overall device.

[0031] In summary, the present application includes at least one of the following beneficial effects:

[0032] 1. By setting a buffer device at the gate valve stem, the impact force generated by the valve stem when it is quickly closed can be effectively reduced, thereby avoiding deformation of the valve stem caused by excessive impact force and significantly improving the service life of the gate valve.

[0033] 2. The buffer device has a reasonable and concise structural design and is made of high-quality materials. It is not only easy to install and maintain, but also ensures a good buffering effect and provides stable protection for the gate valve stem.

[0034] 3. Multiple connection methods such as screws and plug bolts enable the buffer device to be firmly connected to the gate valve, improving stability and reliability during use.

[0035] 4. The butterfly spring and buffer tension spring are used as elastic buffer parts. Their elasticity and buffering capacity are utilized to further protect the valve stem from damage caused by impact force.

[0036] 5. The design of the waterproof layer and the application of hard wear-resistant materials respectively enhance the waterproof performance and wear resistance of the device, extend the service life of the device, and also improve the overall operating efficiency of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of a partial cross-sectional structure of a gate valve stem buffer device installed on a valve body in Example 1 of the present application;

[0038] Figure 2 It is a schematic diagram of a partial cross-sectional structure of a gate valve stem buffer device installed on a valve body in Example 2 of the present application;

[0039] Explanation of the accompanying drawings: 1. Boss; 11. Second plug hole; 111. Snap-in groove; 2. Limit block; 21. Accommodating groove; 22. First plug hole; 23. Sink; 3. Buffer assembly; 31. Buffer platform; 311. Force-bearing part; 312. Limit part; 32. Butterfly spring; 33. Buffer tension spring; 4. Screw; 41. Nail nut; 42. Screw; 5. Connecting bolt; 51. Bolt head; 52. Connecting rod; 53. Elastic pawl; 6. Spring washer; 7. Valve body; 8. Gate. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-2 This application is described in further detail.

[0041] Embodiment 1:

[0042] Reference Figure 1 , this embodiment discloses a gate valve stem buffer device, including a boss 1, a limit block 2, a buffer assembly 3 and a connecting piece. The limit block 2 and the boss 1 are both located below the gate plate 8 of the gate valve. The boss 1 is specifically configured as a rectangular block, and the boss 1 is fixed to the inner wall at the bottom center of the valve body 7 by welding, serving as a supporting base for the entire buffer device. The limit block 2 is connected to the top of the boss 1 through a connecting piece, and a receiving groove 21 is provided at one end of the limit block 2 close to the boss 1 for accommodating the buffer assembly 3. The shape of the upper surface of the limit block 2 is adapted to the shape of the bottom end of the gate plate 8, and the surfaces of the limit block 2 and the boss 1 are coated with a waterproof layer to improve the corrosion resistance of the limit block 2 and the boss 1. The boss 1 is made of hard and wear-resistant materials, such as tungsten carbide, ceramics or cemented carbide.

[0043] Reference Figure 1, the connecting piece specifically adopts a screw 4, and the screw 4 includes a nail cap 41 and a screw rod 42 that are connected to each other. A recessed groove 23 is provided on the upper surface of the limit block 2, and a spring washer 6 is arranged in the recessed groove 23. One end of the screw rod 42 passes through the spring washer 6 and the limit block 2 along the recessed groove 23 and is screwed into the boss 1 to form a threaded connection with the boss 1, and the nail cap 41 is pressed against the spring washer 6. In this embodiment, two screws 4 are arranged at intervals, and two recessed grooves 23 and spring washers 6 are also arranged accordingly. The screw 4 is tightly matched with the thread in the boss 1 through its thread to form a firm connection. During the operation of the gate valve, even if it is subjected to a large impact force, the screw 4 can effectively keep the relative position of the limit block 2 and the boss 1 unchanged, thereby ensuring the stability and buffering effect of the buffer device.

[0044] Reference Figure 1 , the buffer assembly 3 includes a buffer table 31 and an elastic buffer, wherein the buffer table 31 includes a fixedly connected limiting portion 312 and a force-bearing portion 311. In the present embodiment, the limiting portion 312 is specifically configured as a circular plate, and the force-bearing portion 311 is specifically configured as a cylindrical shape, and the diameter of the limiting portion 312 is greater than the diameter of the force-bearing portion 311. The buffer assembly 3 is located between the limiting block 2 and the boss 1, and the buffer table 31 is slidably connected to the limiting block 2. Among them, the limiting portion 312 is located in the receiving groove 21, and one end of the force-bearing portion 311 passes through the inner side wall of the receiving groove 21, so that the force-bearing portion 311 can receive the impact force transmitted by the gate plate 8. When the force-bearing portion 311 is forced to slide in the receiving groove 21 toward the gate plate 8, the limiting portion 312 can resist the inner side wall of the receiving groove 21, thereby preventing the buffer table 31 from slipping off the limiting block 2. The elastic buffer is specifically configured as a butterfly spring 32, and the butterfly spring 32 is located between the limiting portion 312 and the boss 1; in this embodiment, a plurality of butterfly springs 32 are provided, and adjacent butterfly springs 32 are abutted against each other. When the force-bearing portion 311 is subjected to the impact force of the gate plate 8, the butterfly spring 32 is compressed. When the butterfly spring 32 is compressed, a corresponding reaction force is generated, and this reaction force can slow down the movement speed of the force-bearing portion 311 and disperse the impact force. When the impact force disappears, the butterfly spring 32 will quickly return to its original state and push the force-bearing portion 311 back to its initial position.

[0045] In other embodiments, the elastic buffer may also be configured as a rubber column or a disc spring.

[0046] The implementation principle of the valve stem buffer device of the gate valve of the first embodiment is as follows: when the gate valve is closed quickly, the impact force generated by the valve stem (not shown in the figure) is transmitted to the gate plate 8 and then to the force-bearing part 311. Under the action of the impact force, the force-bearing part 311 will slide downward on the limit block 2 and compress the butterfly spring 32. The butterfly spring 32 absorbs the impact force through its own elastic deformation, thereby reducing the reaction force on the valve stem and preventing the valve stem from deformation. When the impact force disappears, the butterfly spring 32 will return to its original shape, pushing the force-bearing part 311 to reset, and preparing for the next buffer.

[0047] Embodiment 2:

[0048] Embodiment 2 of the present application provides a gate valve stem buffer device.

[0049] refer to Figure 2 , the difference between the embodiment 2 of the present application and the embodiment 1 is that: in this embodiment, the connector adopts a plug bolt 5; the plug bolt 5 includes a bolt head 51, a plug rod 52 connected to the bolt head 51, and an elastic pawl 53 fixed to the plug rod 52. The cross-sectional area of ​​the plug rod 52 gradually decreases in the direction away from the bolt head 51, and is specifically set to be a frustum; the elastic pawl 53 is connected to the end of the plug rod 52 away from the bolt head 51, and the distance between the elastic pawl 53 and the plug rod 52 gradually increases in the direction close to the bolt head 51. In this embodiment, a plurality of elastic pawls 53 are connected to the plug rod 52, and the elastic pawls 53 are arranged at intervals around the axis of the plug rod 52. In this embodiment, two elastic pawls 53 are provided.

[0050] refer to Figure 2 , a first plug hole 22 is provided on the limit block 2, and a second plug hole 11 is provided on the boss 1; the first plug hole 22 and the second plug hole 11 are opposite to each other, and a clamping groove 111 for the elastic pawl 53 to be clamped is provided on the inner side wall of the second plug hole 11. When the limit block 2 is installed on the boss 1, one end of the plug rod 52 connected with the elastic pawl 53 is inserted into the first plug hole 22 and the second plug hole 11 in turn. When the plug rod 52 drives the elastic pawl 53 to move to the clamping groove 111, the elastic pawl 53 is clamped into the clamping groove 111. At this time, the bolt head 51 is also located in the sink 23 and abuts against the spring washer 6. In this embodiment, two plug bolts 5 are arranged at intervals. When disassembly is required, only the plug bolt 5 needs to be pulled out to achieve quick disassembly and installation, which is convenient for repairing or replacing parts of the buffer device.

[0051] refer to Figure 2 In the present embodiment, the elastic buffer is specifically configured as a buffer tension spring 33, and the buffer tension spring 33 is located at one end of the limiting portion 312 close to the force-bearing portion 311, and the buffer tension spring 33 is sleeved on the column section of the force-bearing portion 311 located in the accommodating groove 21; one end of the buffer tension spring 33 is fixedly connected to the inner wall of the accommodating groove 21, and the other end is fixedly connected to the limiting portion 312.

[0052] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application. New technical solutions can also be formed through the combination and flexible use of different embodiments and fall within the protection scope of the present application.

Claims

1. Gate valve stem buffer device, characterized in that: include: A boss (1) is used to connect with the valve body (7); A limit block (2), wherein an end of the limit block (2) close to the boss (1) is provided with a receiving groove (21); A buffer assembly (3), comprising a buffer platform (31) and an elastic buffer member, wherein the buffer platform (31) is slidably disposed on the limit block (2), the buffer platform (31) comprises a limit portion (312) and a force-bearing portion (311) connected to each other, one end of the force-bearing portion (311) passes through an inner side wall of the receiving groove (21), the limit portion (312) is used to abut against the inner side wall of the receiving groove (21), and the elastic buffer member is located in the receiving groove (21); A connecting piece, the connecting piece is used to connect the limit block (2) and the boss (1).

2. The gate valve stem buffer device according to claim 1, characterized in that: The connecting member comprises a screw (4), one end of the screw (4) is inserted into the boss (1) along the limiting block (2) and is threadedly connected to the boss (1).

3. The gate valve stem buffer device according to claim 1, characterized in that: The connecting member comprises a plug bolt (5), wherein the plug bolt (5) comprises a bolt head (51), a plug rod (52) connected to the bolt head (51), and an elastic pawl (53) fixed to the plug rod (52); The limit block (2) is provided with a first insertion hole (22) for accommodating the plug-in rod (52), the boss (1) is provided with a second insertion hole (11) for accommodating the plug-in rod (52), and the inner side wall of the second insertion hole (11) is provided with a clamping groove (111) for clamping the elastic pawl (53).

4. The gate valve stem buffer device according to claim 3, characterized in that: The cross-sectional area of ​​the plug-in rod (52) gradually decreases in a direction away from the bolt head (51).

5. The gate valve stem buffer device according to claim 4, characterized in that: The distance between the elastic pawl (53) and the plug-in rod (52) gradually increases in a direction approaching the bolt head (51).

6. The gate valve stem buffer device according to claim 2, characterized in that: The screw (4) comprises a nail cap (41) and a screw rod (42) which are connected to each other. The limit block (2) is provided with a recessed groove (23) for the nail cap (41) to be clamped. A spring washer (6) is arranged in the recessed groove (23). The spring washer (6) is sleeved on the screw rod (42).

7. The gate valve stem buffer device according to claim 2, characterized in that: The elastic buffer comprises a butterfly spring (32), and the butterfly spring (32) abuts between the limiting portion (312) and the boss (1).

8. The gate valve stem buffer device according to claim 3, characterized in that: The elastic buffer component comprises a buffer tension spring (33), the buffer tension spring (33) is sleeved outside the force-bearing portion (311), and the buffer tension spring (33) is connected between the limiting portion (312) and the inner side wall of the accommodating groove (21).

9. The gate valve stem buffer device according to claim 1, characterized in that: The outer surfaces of the limiting block (2) and the boss (1) are both provided with a waterproof layer.

10. The gate valve stem buffer device according to claim 1, characterized in that: The boss (1) is made of hard and wear-resistant material.

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