Butterfly valve

Abstract

The utility model discloses a butterfly valve which comprises a valve body, a valve rod and a butterfly plate, the butterfly plate is arranged in the valve body, the valve rod penetrates through the valve body and is in linkage connection with the butterfly plate to drive the butterfly plate to rotate, and a valve seat which is in sealing fit with the butterfly plate when the valve is closed is arranged in the valve body. The butterfly valve is characterized in that an elastic sealing piece is arranged on the valve seat, a fixing block fixed to the valve seat is arranged outside the valve rod, a sealing channel is formed between the valve seat and the fixing block, an elastic sealing piece is fixed in the sealing channel, and the end of the elastic sealing piece extends out of the sealing channel to abut against the end face of the butterfly plate to form sealing connection.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, especially a butterfly valve. BACKGROUND

[0002] The butterfly valve is a valve which opens, closes or regulates medium flow by rotating a disc-like opening and closing element by 90 degrees or so. The butterfly valve has simple structure, small volume, light weight, low material consumption, small installation size, small driving torque, easy and rapid operation, and good flow regulating function and sealing characteristics, and is one of the fastest developing valve varieties in recent ten years. The butterfly valve is widely used. Its variety and quantity continue to expand, and it develops towards high temperature, high pressure, large diameter, high sealing property, long service life, excellent regulating characteristics and multi-function. Its reliability and other performance indicators reach a high level.

[0003] The butterfly valve in the prior art comprises a valve body, a butterfly plate and a valve rod, the butterfly plate is connected and installed on the valve rod, the circular butterfly plate is arranged in the valve body and can rotate in the valve body through the support of the valve rod, and the valve body has a valve seat for sealing cooperation with the butterfly plate when the valve is closed. The valve seat is made of metal or rubber, and the problem of such a valve seat is that water and air tightness rapidly decrease due to wear over time. Therefore, frequent disassembly, repair or replacement are required, resulting in problems such as increased maintenance cost. SUMMARY

[0004] The utility model discloses a butterfly valve, the utility model discloses structure is more stable and reliable, can guarantee that the sealing ring each part is forced evenly in the installation and use process, promotes its service life, thereby guaranteeing the sealing property of reliable valve.

[0005] To achieve the above object, the utility model provides the following technical scheme: a butterfly valve, including valve body, valve rod and butterfly plate, the butterfly plate is arranged in the valve body, the valve rod is through valve body and is connected with the butterfly plate linkage for driving the rotation of butterfly plate, the valve body is equipped with the valve seat for the sealing cooperation with the butterfly plate when the valve is closed, be equipped with the elastic sealing member on the valve seat, the valve rod is equipped with the fixed block that fixes on the valve seat outward, the valve seat and fixed block form the sealed channel between, the elastic sealing member is fixed in the sealed channel, and the elastic sealing member end extends the sealed channel and forms the sealed connection with the butterfly plate end face abutment.

[0006] The elastic sealing member can provide flexible buffering when the butterfly plate rotates, reduce hard friction, reduce the wear rate of the sealing member, improve the durability of the butterfly valve, reduce the maintenance frequency, and make the end thereof abut against the end face of the butterfly plate to form a sealed connection, effectively improving the water tightness and air tightness of the butterfly valve, reducing the sealing failure problem caused by wear, reducing the need for frequent disassembly, replacement or repair of the valve, thereby reducing the maintenance cost and improving the overall economy of the equipment.

[0007] Preferably, the elastic sealing member comprises a fixed part and a sealing part, the sealing part comprises an arc-shaped sealing part for abutting against the butterfly plate, the arc-shaped sealing part is connected with an auxiliary sealing part, the auxiliary sealing part extends to the outside of the butterfly plate and has a gap with the end face of the butterfly plate, the valve seat is provided with a first protrusion in the form of a circular arc, the first protrusion abuts against the inner side of the arc-shaped sealing part, when the butterfly plate is closed, the fluid enters the sealing channel to make the arc-shaped sealing part deform under pressure to fit the first protrusion to form a preliminary seal, and when the butterfly plate is closed, the auxiliary sealing part deforms under the change of air pressure to expand the gap, so that the arc-shaped sealing part abuts against the end face of the butterfly plate to form a complete seal.

[0008] The arc-shaped sealing part preliminarily fits the end face of the butterfly plate, and deforms under the action of fluid pressure to fit the first protrusion on the valve seat to form a preliminary seal. As the butterfly plate is completely closed, the auxiliary sealing part deforms due to the change of air pressure, so that the arc-shaped sealing part is in close contact with the end face of the butterfly plate to achieve complete sealing and effectively prevent fluid leakage. Since the arc-shaped sealing part and the auxiliary sealing part will deform when the fluid pressure changes, the sealing structure can automatically adjust to different working conditions to ensure that it can still maintain excellent sealing effect in different pressure environments. Compared with the traditional rigid sealing, the combination of the arc-shaped sealing part and the auxiliary sealing part can effectively buffer the contact pressure when the butterfly plate rotates, reduce direct friction and shear force, thereby reducing the wear rate of the sealing member and improving the service life of the butterfly valve. The first protrusion provided on the valve seat can provide support during the preliminary sealing stage to ensure that the arc-shaped sealing part does not over-press or displace when deforming under pressure, thereby ensuring the long-term stability of the sealing structure.

[0009] Preferably, the fixed part is arranged in a bent shape, the rear part of the fixed part extends into the sealing channel to abut against the valve seat and the fixed block, and an entering channel for fluid entering is arranged between the front part of the fixed block and the sealing channel.

[0010] By designing the fixed part in a bent shape, extending the rear part into the sealing channel, and abutting against the valve seat and the fixed block, the sealing element is effectively fixed, preventing displacement or loosening due to long-term use or fluid impact, improving the stability and durability of the seal. The rear end of the fixed part is in contact with the valve seat and the fixed block, ensuring that the sealing element forms an additional sealing layer in the sealing channel, reducing the possibility of internal fluid leakage.

[0011] Further, the inlet channel extends between the middle of the fixed part and the fixed block in an L shape.

[0012] The L-shaped structure of the inlet channel allows the fluid to enter the sealing channel more smoothly, reducing the impact of fluid impact on the sealing element. After entering the L-shaped channel, the fluid is evenly distributed in the sealing channel, making the arc-shaped sealing part more evenly compressed and enhancing the sealing effect.

[0013] Further, the valve seat is provided with a second protrusion in a circular arc shape, which abuts against the inner side of the front part of the fixed part.

[0014] The second protrusion abuts against the inner side of the front part of the fixed part, making the fixed part more stable and preventing loosening or displacement of the sealing element due to fluid pressure fluctuations or long-term use, improving the long-term reliability of the seal. The first protrusion on the valve seat supports the arc-shaped sealing part, and the second protrusion supports the fixed part, forming a double support structure that makes the stress on the sealing element more uniform, further improving the reliability of the seal. Due to the support of the second protrusion on the fixed part, the sealing element is less likely to deform excessively under high pressure or high-speed fluid impact, improving the applicability of the butterfly valve in high-pressure pipelines.

[0015] Further, the rear part of the fixed part is provided with a plurality of clamping teeth, and the valve seat is provided with a clamping groove matched with the clamping teeth.

[0016] Through the close cooperation of the clamping teeth and the clamping groove, the fixed part can be firmly installed in the valve seat, effectively preventing the sealing element from being displaced or loosened under high flow rate or high pressure fluid impact, improving the long-term sealing stability of the butterfly valve. The clamping teeth and the clamping groove form a multi-point contact, making the force on the fixed part more uniform, enhancing the stability of the sealing structure, and improving its ability to resist high pressure and high flow rate medium impact.

[0017] Preferably, the valve seat is provided with a limiting groove, and the limiting groove is provided with an elastic reset element, and the end part of the auxiliary sealing part abuts against the elastic reset element when the butterfly plate is closed.

[0018] In long-term use, the sealing member can be aged to reduce the sealing ability, and the elastic reset member can compensate for the reduction in sealing performance caused by the wear of the sealing member, thereby prolonging the service life of the butterfly valve. Because the butterfly plate can impact when closing, the traditional sealing structure is easy to be damaged by impact, and the elastic reset member can play a buffering role to reduce the impact force of the butterfly plate on the sealing member when closing, reduce wear, and prolong the service life of the sealing member.

[0019] Further, the inner wall of the limiting groove is provided with limiting blocks on both sides for limiting the elastic reset member.

[0020] The limiting blocks are used to fix the elastic reset member, so that it always remains in the correct position, preventing displacement or falling of the reset member caused by fluid impact, vibration or long-term use, thereby ensuring the stability and reliability of the sealing.

[0021] Further, the elastic reset member is a spring.

[0022] Because the spring has elastic recovery characteristics, it can exert a continuous pressure when the butterfly plate is closed, so that the auxiliary sealing part is tightly attached to the end face of the butterfly plate, ensuring good sealing effect. The traditional static sealing member can be compressed and deformed for a long time, affecting the sealing performance, while the spring design can automatically compensate for the sealing gap, ensuring stable sealing effect for a long time. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 It is Figure 1 An enlarged structural schematic diagram of part A;

[0025] In the figure: 1, valve body; 2, valve shaft; 3, butterfly plate; 4, valve seat; 41, sealing channel; 42, first protrusion; 43, second protrusion; 44, clamping groove; 45, limiting groove; 46, elastic reset member; 47, limiting block; 5, elastic sealing member; 51, fixed part; 52, clamping tooth; 53, arc-shaped sealing part; 54, auxiliary sealing part; 55, gap; 6, fixed block; 61, entry channel. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0027] Embodiment: as shown in the accompanying Figures 1-2The butterfly valve shown includes a valve body 1, a valve stem and a butterfly plate 3, the butterfly plate 3 is arranged in the valve body 1, the valve stem penetrates the valve body 1 and is connected with the butterfly plate 3 for driving the butterfly plate 3 to rotate, the valve body 1 is provided with a valve seat 4 for sealing cooperation with the butterfly plate 3 when the valve is closed; the valve seat 4 is provided with an elastic sealing element 5, the valve stem is provided with a fixed block 6 fixed on the valve seat 4, a sealing channel 41 is formed between the valve seat 4 and the fixed block 6, the elastic sealing element 5 is fixed in the sealing channel 41, and the end of the elastic sealing element 5 extends out of the sealing channel 41 and abuts against the end face of the butterfly plate 3 to form a sealed connection.

[0028] Since the elastic sealing element 5 can provide flexible buffering when the butterfly plate 3 rotates and reduce hard friction, the wear rate of the sealing element is reduced, the durability of the butterfly valve is improved, the maintenance frequency is reduced, and the end thereof abuts against the end face of the butterfly plate 3 to form a sealed connection, thereby effectively improving the water tightness and air tightness of the butterfly valve and reducing the problem of sealing failure caused by wear. The need for frequent disassembly, replacement or repair of the valve due to sealing failure is reduced, thereby reducing the maintenance cost and improving the overall economy of the equipment.

[0029] The elastic sealing element 5 includes a fixed part 51 and a sealing part, the sealing part includes an arc-shaped sealing part 53 for abutting and sealing with the butterfly plate 3, the arc-shaped sealing part 53 is connected with an auxiliary sealing part 54, the auxiliary sealing part 54 extends to the outside of the butterfly plate 3 and has a gap 55 with the end face of the butterfly plate 3, the valve seat 4 is provided with a first protrusion 42 in the form of a circular arc, the first protrusion 42 abuts against the inner side of the arc-shaped sealing part 53, when the butterfly plate 3 is closed, fluid enters along the sealing channel 41 to make the arc-shaped sealing part 53 deformed under pressure and fit with the first protrusion 42 to form a preliminary seal, when the butterfly plate 3 is closed, the auxiliary sealing part 54 is deformed under the action of air pressure change to expand the gap 55, so that the arc-shaped sealing part 53 abuts against the end face of the butterfly plate 3 to form a complete seal.

[0030] The arc-shaped sealing part 53 is preliminarily attached to the end face of the butterfly plate 3 and deforms under the action of fluid pressure to be attached to the first protrusion 42 on the valve seat 4 to form a preliminary seal. As the butterfly plate 3 is completely closed, the auxiliary sealing part 54 deforms due to the change in air pressure to make the arc-shaped sealing part 53 tightly contact the end face of the butterfly plate 3 to realize complete sealing and effectively prevent fluid leakage. Since the arc-shaped sealing part 53 and the auxiliary sealing part 54 will deform when the fluid pressure changes, the sealing structure can automatically adjust to adapt to different working conditions to ensure that the excellent sealing effect can be maintained under different pressure environments. Compared with the traditional rigid sealing, the combined sealing mode of the arc-shaped sealing part 53 and the auxiliary sealing part 54 can effectively buffer the contact pressure when the butterfly plate 3 rotates, reduce the direct friction and shear force, thereby reducing the wear rate of the sealing element and prolonging the service life of the butterfly valve. The first protrusion 42 provided on the valve seat 4 can provide support during the preliminary sealing stage to ensure that the arc-shaped sealing part 53 will not be excessively squeezed or displaced when deformed under pressure, thereby ensuring the long-term stability of the sealing structure.

[0031] The fixing part 51 is arranged in a bent shape, and the rear part of the fixing part 51 extends into the sealing channel 41 to abut against and seal with the valve seat 4 and the fixing block 6. An entering channel 61 for fluid entering is arranged between the front part of the fixing block 6 and the sealing channel 41.

[0032] By designing the fixing part 51 in a bent shape, the rear part of the fixing part 51 extends into the sealing channel 41 and abuts against and seals with the valve seat 4 and the fixing block 6 to effectively fix the sealing element, prevent displacement or loosening of the sealing element due to long-term use or fluid impact, and improve the stability and durability of the sealing.

[0033] In the embodiment of the present application, different from the above-mentioned embodiment, the entering channel 61 is arranged in an L shape between the middle part of the fixing part 51 and the fixing block 6.

[0034] The L-shaped structure of the entering channel 61 enables the fluid to enter the sealing channel 41 more smoothly, reducing the impact of fluid impact on the sealing element. After entering the L-shaped channel, the fluid is uniformly distributed in the sealing channel 41, making the arc-shaped sealing part 53 be pressed more uniformly and enhancing the sealing effect.

[0035] In the embodiment of the present application, different from the above-mentioned embodiment, the valve seat 4 is provided with a second protrusion 43 in the shape of a circular arc, and the second protrusion 43 abuts against the inner side of the front part of the fixing part 51.

[0036] The second protrusion 43 abuts the front inner side of the fixed part 51, making the fixed part 51 more stable, preventing the seal from loosening or shifting due to fluid pressure fluctuations or long-term use, and improving the long-term reliability of the seal. The first protrusion 42 on the valve seat 4 supports the arc-shaped sealing part 53, and the second protrusion 43 supports the fixed part 51, forming a double-support structure that makes the stress on the seal more uniform and further improves the reliability of the seal. Due to the supporting effect of the second protrusion 43 on the fixed part 51, the seal is less likely to deform excessively under high pressure or high-speed fluid impact, improving the applicability of the butterfly valve in high-pressure pipelines.

[0037] The rear part of the fixed part 51 is provided with a plurality of teeth 52, and the valve seat 4 is provided with a card slot 44 matched with the teeth 52.

[0038] The close cooperation between the teeth 52 and the card slot 44 enables the fixed part 51 to be firmly installed in the valve seat 4, effectively preventing the seal from shifting or loosening under high flow rate or high pressure fluid impact, and improving the long-term sealing stability of the butterfly valve. The teeth 52 and the card slot 44 form a multi-point contact, making the force on the fixed part 51 more uniform, enhancing the stability of the sealing structure, and improving its ability to resist high pressure and high flow rate medium impact.

[0039] In the embodiment of the present application, unlike the above-mentioned embodiment, the valve seat 4 is provided with a limiting slot 45, the limiting slot 45 is provided with an elastic reset part 46, and the end of the auxiliary sealing part 54 abuts the elastic reset part 46 when the butterfly plate 3 is closed.

[0040] In long-term use, the seal may lose its sealing ability due to aging, while the elastic reset part 46 can compensate for the decrease in sealing performance caused by wear of the seal, prolonging the service life of the butterfly valve. Since the butterfly plate 3 may impact when it is closed, the traditional sealing structure is prone to impact damage, while the elastic reset part 46 can act as a buffer to reduce the impact force on the seal when the butterfly plate 3 is closed, reduce wear and tear, and prolong the service life of the seal.

[0041] The inner wall of the limiting slot 45 is provided with limiting blocks 47 for limiting the elastic reset part 46.

[0042] The limiting blocks 47 are used to fix the elastic reset part 46, so that it always remains in the correct position, preventing the reset part from shifting or falling off due to fluid impact, vibration or long-term use, thereby ensuring the stability and reliability of the seal.

[0043] The elastic reset part 46 is a spring.

[0044] Because the spring has the elastic recovery characteristic, can apply the sustained pressure when the butterfly plate 3 closes, make the auxiliary sealing part 54 and the butterfly plate 3 end face closely, ensure good sealing effect.The traditional static seal may cause compression deformation due to long time use, affect the sealing performance, and the spring type design can automatically compensate the sealing gap 55, ensure that long-term use can still maintain stable sealing effect.

Claims

1. A butterfly valve comprising a valve body, a valve stem and a butterfly plate, the butterfly plate being arranged in the valve body, the valve stem penetrating through the valve body and being connected with the butterfly plate in linkage for driving the butterfly plate to rotate, a valve seat being arranged in the valve body for sealingly cooperating with the butterfly plate when the valve is closed; characterized in that: The valve seat is provided with an elastic sealing element, the valve rod is externally provided with a fixed block fixed on the valve seat, a sealing channel is formed between the valve seat and the fixed block, the elastic sealing element is fixed in the sealing channel, and the end of the elastic sealing element extends out of the sealing channel and abuts against the end face of the butterfly plate to form a sealed connection.

2. The butterfly valve of claim 1, wherein: The elastic sealing element comprises a fixed part and a sealing part, the sealing part comprises an arc-shaped sealing part for abutting against and sealing the butterfly plate, the arc-shaped sealing part is connected with an auxiliary sealing part, the auxiliary sealing part extends to the outside of the butterfly plate and has a gap with the end face of the butterfly plate, the valve seat is provided with a first protrusion in the form of a circular arc, the first protrusion abuts against the inner side of the arc-shaped sealing part, when the butterfly plate is closed, fluid enters along the sealing channel to make the arc-shaped sealing part deformed under pressure to be in close contact with the first protrusion to form a preliminary seal, and when the butterfly plate is closed, the auxiliary sealing part is deformed under the change of air pressure to expand the gap, so that the arc-shaped sealing part abuts against the end face of the butterfly plate to form a complete seal.

3. The butterfly valve of claim 2, wherein: The fixed part is arranged in a bent shape, the rear part of the fixed part extends into the sealing channel and abuts against and seals the valve seat and the fixed block, and an entering channel for fluid entering is arranged between the front part of the fixed block and the sealing channel.

4. The butterfly valve of claim 3, wherein: The entering channel is arranged in an L shape between the middle part of the fixed part and the fixed block.

5. The butterfly valve of claim 2 or 3, wherein: The valve seat is provided with a second protrusion in the form of a circular arc, and the second protrusion abuts against the inner side of the front part of the fixed part.

6. The butterfly valve of claim 3, wherein: The rear part of the fixed part is provided with a plurality of clamping teeth, and the valve seat is provided with clamping grooves matched with the clamping teeth.

7. The butterfly valve of claim 2, wherein: The valve seat is provided with a limiting groove, the limiting groove is provided with an elastic reset element, and the end of the auxiliary sealing part abuts against the elastic reset element when the butterfly plate is closed.

8. The butterfly valve of claim 7, wherein: Limiting blocks for limiting the elastic reset element are arranged on the inner walls of the limiting groove.

9. The butterfly valve of claim 7, wherein: The elastic reset element is a spring.

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