Butterfly valve with anti-corrosion sealing structure

Abstract

The utility model discloses a butterfly valve with an anti-corrosion sealing structure, which belongs to the technical field of valves and comprises a valve body, a valve seat, a valve plate and an actuating mechanism, a sealing ring is mounted on the periphery of the valve plate, and the sealing ring seals a gap between the valve plate and the valve seat when the valve plate is closed. An annular sealing piece with an annular cavity inside is formed in the anti-corrosion outer sleeve, an annular elastic body is arranged in the annular cavity, and the annular elastic body applies elastic force expanding towards the periphery to the anti-corrosion outer sleeve. According to the anti-corrosion butterfly valve with the novel sealing structure, the anti-corrosion advantage of a PTFE material and the elastic characteristic of the rubber O-shaped ring are combined, a sealing solution which is more reliable, efficient, long in service life and easy to maintain is provided, and the performance and reliability of the butterfly valve in various industrial applications are remarkably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a butterfly valve with an anti-corrosion sealing structure. Background Art

[0002] The structure of butterfly valve is simple and easy to operate. It is mainly composed of five basic parts: valve body, valve disc, valve stem, valve seat and operating mechanism. The valve body is the main shell of the butterfly valve, connected to the pipeline, usually made of metal or plastic, to withstand pipeline pressure and protect internal components. The valve disc is a key component of the butterfly valve, which controls the flow of fluid by rotation. It is usually round and contacts the valve seat to achieve sealing. The valve stem connects the valve disc and the external operating mechanism, drives the rotation of the valve disc by rotating the valve stem, and is usually made of stainless steel or other corrosion-resistant materials. The valve seat is the sealing surface in contact with the valve disc, usually made of elastic material or metal, and provides the sealing performance required when the butterfly valve is closed. The operating mechanism is used to control the rotation of the valve stem, and then control the opening and closing of the valve disc. Common operating mechanisms include handles, gear transmissions, electric actuators and pneumatic actuators. These basic structures together constitute the butterfly valve, enabling it to efficiently control the flow and pressure of the fluid.

[0003] At present, the anti-corrosion butterfly valve mainly uses PTFE sealing ring for sealing. Although it has good anti-corrosion ability, it also has some disadvantages and shortcomings in practical applications. First, the elasticity of the PTFE sealing ring is poor, which means that in repeated switching operations, the deformation and recovery ability of the sealing ring are poor, which easily leads to a decrease in sealing performance. Secondly, due to the poor resilience of PTFE materials, the processing and assembly requirements of the sealing ring are very strict, and precise manufacturing processes and installation techniques are required, otherwise poor sealing or leakage is likely to occur. In addition, PTFE sealing rings are prone to cold flow and creep under high pressure or high temperature environments, further affecting the sealing effect. Although the low friction coefficient of PTFE helps to reduce wear, in some application scenarios, too low friction may also cause slippage between the sealing ring and the valve seat, and it is impossible to maintain a stable sealing state. Finally, although PTFE has good chemical inertness, its service life is relatively short after long-term use, especially in high temperature, high pressure or corrosive media, and it needs frequent replacement and maintenance, which increases the operating cost and maintenance difficulty. In summary, although PTFE sealing rings have their advantages in anti-corrosion butterfly valves, they also have many shortcomings, and improvements are urgently needed in material selection and design to improve their overall performance and reliability. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model provides a butterfly valve with an anti-corrosion sealing structure which solves the problems of insufficient elasticity, high processing and assembly requirements and short service life of the current anti-corrosion butterfly valve using a PTFE sealing ring.

[0005] The utility model is implemented as follows: a butterfly valve with an anti-corrosion sealing structure includes a valve body, a valve seat, a valve plate and an actuator, a sealing ring is installed on the outer periphery of the valve plate, and when the valve plate is closed, the sealing ring seals the gap between the valve plate and the valve seat, and is characterized in that: the sealing ring includes an anti-corrosion jacket, the anti-corrosion jacket forms an annular sealing member with an annular cavity inside, an annular elastomer is arranged in the annular cavity, and the annular elastomer exerts an elastic force on the anti-corrosion jacket to expand toward the periphery.

[0006] In the above technical solution, preferably, an annular opening communicating with the annular cavity is formed on the outer side of the anti-corrosion jacket, and the annular opening is formed between the annular edges on both sides of the anti-corrosion jacket.

[0007] In the above technical solution, preferably, the anti-corrosion jacket is fixed to the valve seat via a pressure seat.

[0008] In the above technical solution, preferably, the pressure seat is an annular component, an annular groove is formed between the annular surfaces of the pressure seat and the valve seat that are relatively squeezed, and the outer periphery of the anti-corrosion jacket is provided with an outwardly protruding annular bulge embedded in the annular groove.

[0009] In the above technical solution, preferably, the contact surface between the valve seat and the anti-corrosion sleeve is provided with an annular groove, the contact surface between the pressure seat and the anti-corrosion sleeve forms an annular groove, and the two annular grooves form the annular clamping groove for clamping the anti-corrosion sleeve; the two sides of the anti-corrosion sleeve are respectively provided with the annular protrusions embedded in the annular grooves.

[0010] In the above technical solution, preferably, the anti-corrosion jacket is a PTFE annular sealing ring.

[0011] In the above technical solution, preferably, the annular elastic body is an O-shaped rubber sealing ring arranged in the annular cavity of the anti-corrosion jacket.

[0012] Provided is a corrosion-resistant butterfly valve with a new sealing structure. The sealing adopts a new PTFE inner rubber sealing O-ring sealing valve seat. It has a certain floating property during assembly, and the processing tolerance band of the valve seat sealing ring can be appropriately increased, and the interference and elasticity of the valve seat sealing ring can be increased, so that the sealing performance of the valve is more reliable. The new PTFE inner rubber sealing O-ring sealing valve seat, its PTFE corrosion-resistant material no longer needs to rely on elastic elements, and its overall deformation is more dependent on the internally wrapped rubber valve seat O-ring, so the performance is more reliable. The advantages and effects of this design are as follows:

[0013] Enhanced sealing performance: The inner rubber sealing O-ring provides stronger elasticity and sealing pressure, ensuring good sealing effect under high pressure and temperature change environment.

[0014] Floating design: It has a certain degree of floating during assembly, which can appropriately increase the processing tolerance zone, simplify the processing and assembly process, improve assembly efficiency, and reduce the high requirements for precision.

[0015] Long life and high reliability: The internally wrapped rubber O-ring provides better elasticity and recovery ability, reduces the cold flow and creep problems caused by the rigidity of the PTFE material, and extends the service life of the seal.

[0016] Excellent anti-corrosion performance: The PTFE material of the outer layer has excellent chemical resistance and corrosion resistance, and can be used in various corrosive media. It is suitable for petroleum, chemical, pharmaceutical and other industries.

[0017] Reduced maintenance costs: Due to the enhanced sealing performance and extended service life, the need for frequent replacement and maintenance is reduced, thereby reducing operating costs and maintenance difficulties.

[0018] Strong adaptability: This new sealing structure can adapt to a wider range of working conditions, including high temperature, high pressure and corrosive environment, which improves the application range of butterfly valves.

[0019] Improve assembly flexibility: By allowing a certain degree of float and increasing the processing tolerance zone, it is more flexible and convenient in practical applications and can adapt to various complex installation conditions.

[0020] In general, the corrosion-resistant butterfly valve with a new sealing structure combines the anti-corrosion advantages of PTFE materials and the elastic properties of rubber O-rings, providing a more reliable, efficient, long-life and easy-to-maintain sealing solution, significantly improving the performance and reliability of butterfly valves in various industrial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 It is a cross-sectional view of the utility model;

[0023] Figure 3 yes Figure 2 Enlarged view of part A in the middle. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0025] In order to solve the problems of insufficient elasticity, high processing and assembly requirements, and short service life of the current anti-corrosion butterfly valve using PTFE sealing rings, the utility model provides a butterfly valve with an anti-corrosion sealing structure. The butterfly valve provides a more reliable, efficient, long-life and easy-to-maintain sealing solution, which significantly improves the performance and reliability of the butterfly valve in various industrial applications. In order to further illustrate the structure of the utility model, the detailed description is as follows in conjunction with the attached drawings:

[0026] See also Figure 1-Figure 3 A butterfly valve with an anti-corrosion sealing structure includes a valve body, a valve seat 1, a valve plate 2 and an actuator. A sealing ring is installed on the outer periphery of the valve plate. When the valve plate is closed, the sealing ring seals the gap between the valve plate and the valve seat. The valve body, valve seat, valve plate and actuator are known basic components of butterfly valves. The valve body is the main outer shell of the butterfly valve, connected to the pipeline, and is usually made of metal (such as cast iron, stainless steel) or plastic. It withstands pipeline pressure and protects internal components. The valve plate is a key component of the butterfly valve and controls the flow of fluid by rotation. It is usually circular and contacts the valve seat to achieve sealing. The valve seat is a sealing surface that contacts the valve plate, usually made of elastic material (such as rubber) or metal. In this embodiment, the valve seat is integrally formed with the valve body and is made of metal. The valve seat provides the sealing performance required when the butterfly valve is closed. It also includes a valve stem 3, which connects the valve plate and the external actuator and drives the rotation of the valve plate by rotating the valve stem. The valve stem is usually made of stainless steel or other corrosion-resistant materials. The actuator is used to control the rotation of the valve stem, thereby controlling the opening and closing of the valve plate. Common operating mechanisms include handles, gear transmissions, electric actuators, and pneumatic actuators.

[0027] The sealing ring is a sealing component used in valves to ensure good sealing performance when the valve is closed. The main function of the sealing ring is to fill the gap between the valve plate and the valve seat to prevent fluid leakage. When the valve is closed, the valve plate contacts the sealing ring, and the sealing of the fluid is achieved through the elastic deformation of the sealing ring. When the valve is opened, the sealing ring returns to its original state, reducing friction and extending its service life.

[0028] In the technical solution, the sealing ring includes an anti-corrosion jacket 4, which forms an annular sealing member with an annular cavity inside. An annular elastic body 5 is arranged in the annular cavity, and the annular elastic body exerts an elastic force on the anti-corrosion jacket to expand toward the periphery.

[0029] The outer side of the anti-corrosion jacket forms an annular opening connected to the annular cavity, and the annular opening is formed between the annular edges on both sides of the anti-corrosion jacket. The setting of this annular opening facilitates the assembly of the annular elastic body. When the sealing ring is assembled on the butterfly valve, the outer annular opening edge of the anti-corrosion jacket is fixed, squeezed and closed.

[0030] Specifically, the anti-corrosion jacket is fixed to the valve seat through the pressure seat 6. The pressure seat is an annular component, that is, the pressure seat plays the role of a pressure ring to squeeze and fix the outer circumference of the anti-corrosion jacket on the valve seat. An annular groove is formed between the annular surfaces of the pressure seat and the valve seat that are relatively squeezed, and the outer periphery of the anti-corrosion jacket is provided with an annular convex portion 4-1 that protrudes outward and is embedded in the annular groove. This structural design makes the fixing of the sealing ring more stable and reliable, and the installation position accuracy can also be effectively guaranteed. The annular groove is specifically formed as follows: the contact surface of the valve seat and the anti-corrosion jacket is provided with an annular groove, and the contact surface of the pressure seat and the anti-corrosion jacket forms an annular groove. The two annular grooves form an annular groove for clamping the anti-corrosion jacket. The two sides of the anti-corrosion jacket are respectively provided with annular convex portions that are embedded in the annular grooves. Through the extrusion force between the valve seat and the pressure seat, the anti-corrosion jacket is reliably pressed and fixed. At the same time, the extrusion force causes the annular elastomer to exert sufficient external expansion force on the anti-corrosion jacket from the inside.

[0031] The anti-corrosion jacket is a PTFE annular seal ring, that is, a sleeve-type annular component made of PTFE. The annular elastomer is an O-shaped rubber seal ring arranged in the annular cavity of the anti-corrosion jacket. PTFE (polytetrafluoroethylene) has significant advantages in deformation as a sealing component material. First, PTFE has excellent chemical inertness and corrosion resistance, and can resist almost all chemicals, which enables it to remain stable in various harsh environments. Secondly, the low friction coefficient and self-lubricating properties of PTFE enable it to reduce wear and extend the service life of the seal during repeated mechanical movements. Most importantly, the improved PTFE anti-corrosion jacket has good elasticity and recovery, and can quickly return to its original state after compression to maintain sealing performance. This technical solution utilizes the advantages of two materials through a combined design: the chemical resistance and low friction properties of PTFE, and the elasticity and compression rebound properties of rubber. Specifically, the O-shaped rubber seal ring provides a continuous outward elastic force, which makes the PTFE seal ring close to the sealing surface, thereby improving the sealing effect and ensuring that good sealing performance is maintained under high pressure or temperature changes.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A butterfly valve with an anti-corrosion sealing structure, comprising a valve body, a valve seat, a valve plate and an actuator, wherein a sealing ring is installed on the periphery of the valve plate, and when the valve plate is closed, the sealing ring seals the gap between the valve plate and the valve seat, characterized in that: The sealing ring comprises an anti-corrosion outer sleeve, which forms an annular sealing member with an annular cavity inside. An annular elastic body is arranged in the annular cavity, and the annular elastic body exerts an elastic force on the anti-corrosion outer sleeve to expand toward the periphery.

2. The butterfly valve with an anti-corrosion sealing structure according to claim 1, characterized in that: An annular opening communicating with the annular cavity is formed on the outer side of the anti-corrosion jacket, and the annular opening is formed between the annular edges on both sides of the anti-corrosion jacket.

3. The butterfly valve with an anti-corrosion sealing structure according to claim 2, characterized in that: The anti-corrosion jacket is fixed to the valve seat through a pressure seat.

4. The butterfly valve with an anti-corrosion sealing structure according to claim 3 is characterized in that: The pressure seat is an annular component, and an annular groove is formed between the annular surfaces of the pressure seat and the valve seat that are pressed relatively. The outer periphery of the anti-corrosion jacket is provided with an outwardly protruding annular convex portion embedded in the annular groove.

5. The butterfly valve with an anti-corrosion sealing structure according to claim 4, characterized in that: The contact surface between the valve seat and the anti-corrosion sleeve is provided with an annular groove, and the contact surface between the pressure seat and the anti-corrosion sleeve forms an annular groove, and the two annular grooves form the annular clamping groove for clamping the anti-corrosion sleeve; the two sides of the anti-corrosion sleeve are respectively provided with the annular protrusions embedded in the annular grooves.

6. The butterfly valve with an anti-corrosion sealing structure according to claim 1 or 5, characterized in that: The anti-corrosion jacket is a PTFE annular sealing ring.

7. The butterfly valve with an anti-corrosion sealing structure according to claim 6, characterized in that: The annular elastic body is an O-shaped rubber sealing ring arranged in the annular cavity of the anti-corrosion jacket.

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