Three-eccentric center butterfly valve capable of being opened and closed quickly

Abstract

A three-eccentric center butterfly valve capable of being opened and closed rapidly comprises a wafer type valve body, a valve rod and a valve rod, the butterfly plate is arranged in the fluid channel and can rotate in the wafer type valve body so that the fluid channel can be opened or closed. The sealing ring is arranged among the wafer type valve body, the valve seat, the butterfly plate and the pressing plate, and when the butterfly plate is closed, the sealing ring is in interference fit with the butterfly plate so as to seal the fluid channel; the pressing plate is movably connected with the valve body, and when the butterfly plate is closed, the pressing plate tightly presses the sealing ring on the butterfly plate; the valve seat is fixed to the valve body and attached to the sealing ring. The valve rod is provided with a power input end and a free supporting end, the free supporting end of the valve rod is rotationally fixed to the wafer type valve body so as to control opening and closing of the butterfly plate, and the power input end of the valve rod is used for providing force enabling the valve rod to rotate. The utility model has the characteristics of simple structure, easy assembly, good sealing effect and long service life.

Description

Technical Field

[0001] The utility model relates to the technical field of triple-eccentric butterfly valves, in particular to a fast-opening and closing triple-eccentric butterfly valve. Background Art

[0002] Since the butterfly valve was invented by American scientists in the 1930s, it has gone through the development of concentric butterfly valves, single eccentric butterfly valves, double eccentric butterfly valves, and triple eccentric butterfly valves. The triple eccentric butterfly valve, i.e., high-performance butterfly valve, was introduced from abroad in the 1980s. It is a high-performance butterfly valve product developed mainly to cope with the increasingly high requirements of process conditions. Its essence is to fundamentally change the sealing structure. It is no longer a position seal, but a torsion seal, that is, it does not rely on the elastic deformation of the valve seat, but completely relies on the contact surface pressure of the valve seat to achieve the sealing effect, solving the problem of zero leakage of the metal valve seat. However, in the actual production and use process, the actual contact process of interference and the long fitting wear phenomenon lead to various unpredictable damages on the hard sealing surface, which seriously affects the service life of the triple eccentric butterfly valve. Therefore, the utility model aims to provide a fast opening and closing triple eccentric butterfly valve, which not only has a small opening and closing torque and good sealing performance, but also has high reliability and long service life.

[0003] It is to be understood that the above statements merely provide background technology related to the present invention and do not necessarily constitute prior art. Utility Model Content

[0004] The utility model aims to provide a fast-opening and closing three-eccentric butterfly valve, which can maintain a good sealing effect and a long service life while having a simple structure and being easy to assemble.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a fast opening and closing three-eccentric butterfly valve, comprising: a wafer-type valve body, in which a fluid channel is arranged; a butterfly plate, which is arranged in the fluid channel and can rotate in the wafer-type valve body to open or close the fluid channel; a sealing ring, which is arranged between the wafer-type valve body, the valve seat, the butterfly plate and the pressure plate, and when the butterfly plate is closed, the sealing ring is interference fit with the butterfly plate to achieve sealing of the fluid channel; a pressure plate, which is movably connected to the valve body, and when the butterfly plate is closed, the pressure plate presses the sealing ring against the butterfly plate; a valve seat, which is fixed on the valve body and fits with the sealing ring to form a sealing pressure ratio; a valve stem, which has a power input end and a free support end, and its free support end is rotatably fixed on the wafer-type valve body to control the opening and closing of the butterfly plate, and its power input end is used to provide a force to rotate the valve stem.

[0006] Preferably, the contact surface of the valve seat that fits the sealing ring is an inclined conical surface to form a slightly obtuse angle structure; the contact surface of the sealing ring that fits the valve seat is an inclined conical surface to form a slightly obtuse angle structure.

[0007] Preferably, the slightly obtuse angle structure is a mechanical structure of 90°+a°, and the angle range of a is between 0° and 1°.

[0008] Preferably, the triple-eccentric butterfly valve further includes a gasket, which is respectively arranged between the valve seat and the wafer-type valve body, and between the sealing ring and the butterfly plate.

[0009] Preferably, the parts of the valve seat and the wafer-type valve body respectively in contact with the gasket are sealed in the form of water-tight threads to increase the friction coefficients of the valve seat and the wafer-type valve body to the gasket respectively.

[0010] Preferably, the gasket is a graphite gasket.

[0011] Preferably, the triple eccentric butterfly valve further includes a positioning pin, which is arranged between the sealing ring and the butterfly plate.

[0012] In summary, compared with the prior art, the fast opening and closing three-eccentric butterfly valve provided by the utility model has the following beneficial effects:

[0013] (1) The slightly obtuse angle can effectively reduce the contact and sliding time between the valve seat and the sealing ring when the three-eccentric butterfly valve is opened, and reduce the possibility of collision between the internal structure of the valve and the rotating parts, thereby increasing the service life under the same environment;

[0014] (2) By turning the water thread, the friction coefficient of the graphite gasket is increased, reducing the risk of leakage caused by the separation of the valve seat and the valve body;

[0015] (3) The valve body and valve seat are separated, which facilitates the adjustment and maintenance of the valve seat and seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the specific structure of the utility model;

[0017] Figure 2 It is a partial enlarged schematic diagram of the circumference of the sealing ring of the utility model. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] like Figure 1 As shown, the utility model provides a fast opening and closing three-eccentric butterfly valve, comprising: a wafer-type valve body 1, in which a fluid channel is arranged; a butterfly plate 4, which is arranged in the fluid channel and can rotate in the wafer-type valve body 1 to open or close the fluid channel; a sealing ring 3, which is arranged between the wafer-type valve body 1, the valve seat 2, the butterfly plate 4 and the pressure plate 5, and when the butterfly plate 4 is closed, the sealing ring 3 and the butterfly plate 4 are interference-fitted to achieve sealing of the fluid channel; the pressure plate 5, which is movably connected to the valve body 1, and when the butterfly plate 4 is closed, the pressure plate 5 presses the sealing ring 3 against the butterfly plate 4; the valve seat 2, which is fixed on the valve body 1 and fits with the sealing ring 3 to form a sealing pressure ratio; a valve stem 6, which has a power input end and a free support end, the free support end of which is rotatably fixed on the wafer-type valve body 1 to control the opening and closing of the butterfly plate 4, and the power input end of which is used to provide a force to rotate the valve stem 6.

[0020] The valve seat 2 and the wafer-type valve body 1 are connected in a detachable manner to facilitate replacement and maintenance of the three-eccentric butterfly valve.

[0021] Furthermore, the utility model of a fast opening and closing three-eccentric butterfly valve also includes a gasket 8, which is a graphite gasket, which is respectively arranged between the valve seat 2 and the clamped valve body 1, and between the sealing ring 3 and the butterfly plate 4, so as to enhance the sealing performance by increasing the friction force.

[0022] Among them, the parts of the valve seat 2 and the wafer-type valve body 1 that are respectively in contact with the gasket 8 are sealed in the form of water threads, which can increase the friction coefficients of the valve seat 2 and the wafer-type valve body 1 to the gasket 8 respectively. Accordingly, under the same environment, the friction force is increased to improve the sealing effect of the key position. At the same time, the existence of the water threads forms a vortex-shaped buffer zone between the sealing surface and the gasket 8 made of graphite, which also improves the sealing effect.

[0023] Furthermore, the contact surface of the valve seat 2 that fits the sealing ring 3 is an inclined cone surface, forming a slightly obtuse angle structure. Similarly, the contact surface of the sealing ring 3 that fits the valve seat 2 is also an inclined cone surface, also forming a slightly obtuse angle structure, so that the valve seat 2 and the sealing ring 3 are matched and tightly fitted, wherein the slightly obtuse angle structure is a mechanical structure of 90°+a°, and the angle range of a is between 0° and 1°. It can be obtained that this method effectively reduces the fitting friction time of the sealing surface of the sealing ring 3 and the valve seat 2 under actual working conditions, so that the sealing fitting process of the butterfly plate 4 is closer to the theoretical model, reduces the friction loss of the valve seat 2 and the sealing ring 3, and increases the actual service life.

[0024] Furthermore, a positioning pin 7 is provided between the sealing ring 3 and the butterfly plate 4, and the positioning pin 7 is used to fix the position of the sealing ring 3, maintain the position of the sealing ring 3 unchanged, and thereby ensure that the contact position between the sealing surface of the sealing ring 3 and the valve seat 2 always remains unchanged.

[0025] Furthermore, in the sealing process of a fast opening and closing three-eccentric butterfly valve of the utility model, the actuator of the three-eccentric butterfly valve controls the power input end of the valve stem 6 to rotate, so as to control the free support end of the valve stem 6 to rotate as well and allow the butterfly plate 4 to rotate and close, thereby fixing the sealing ring 3 between the butterfly plate 4 and the pressure plate 5 to realize the sealing function of the three-eccentric butterfly valve.

[0026] Furthermore, in the sealed state, as the butterfly plate 4 and the valve stem 6 rotate relative to each other, when the three-eccentric butterfly valve begins to open, the sealing ring 3 slowly separates from the surface of the valve seat 2 and slides. At this time, since there is a slight obtuse angle of 90°+a° between the sealing ring 3 and the valve seat 2, the contact sliding time of the sealing surface can be effectively reduced, thereby protecting the interference fit and service life of the contact surface.

[0027] To sum up, the utility model is a fast opening and closing three-eccentric butterfly valve, which can effectively reduce the contact sliding time of the valve seat and the sealing ring when opening the three-eccentric butterfly valve through the design of the micro-obtuse angle structure and the water-wheel thread structure, reduce the possibility of collision between the internal structure of the valve and the rotating parts, and also reduce the risk of leakage caused by the separation of the valve seat and the valve body. It has the advantages of good sealing effect, long service life, simple structure, easy assembly, and convenient later maintenance.

[0028] Although the content of the utility model has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the utility model. After reading the above content, various modifications and substitutions of the utility model will be obvious to those skilled in the art. Therefore, the protection scope of the utility model should be limited by the attached claims.

Claims

1. A fast opening and closing triple eccentric butterfly valve, characterized in that: include: A wafer-type valve body, in which a fluid passage is provided; A butterfly plate is disposed in the fluid passage and is capable of rotating in the wafer-type valve body to open or close the fluid passage; A sealing ring is arranged between the wafer-type valve body, the valve seat, the butterfly plate and the pressure plate, and when the butterfly plate is closed, the sealing ring is interference-fitted with the butterfly plate to achieve sealing of the fluid channel; A pressure plate is movably connected to the valve body, and when the butterfly plate is closed, the pressure plate presses the sealing ring onto the butterfly plate; A valve seat is fixed on the valve body and fits with the sealing ring to form a sealing specific pressure; The valve stem has a power input end and a free support end. The free support end is rotatably fixed on the clamp-type valve body to control the opening and closing of the butterfly plate, and the power input end is used to provide a force to rotate the valve stem.

2. The triple eccentric butterfly valve according to claim 1, characterized in that: The contact surface of the valve seat against the sealing ring is an oblique cone surface to form a slightly obtuse angle structure; The contact surface of the sealing ring that abuts against the valve seat is an oblique cone surface to form a slightly obtuse angle structure.

3. The triple eccentric butterfly valve according to claim 2, characterized in that: The micro-obtuse angle structure is a mechanical structure of 90°+a°, and the angle range of a is between 0° and 1°.

4. The triple eccentric butterfly valve according to claim 1, characterized in that: The triple-eccentric butterfly valve further comprises gaskets, which are respectively arranged between the valve seat and the wafer-type valve body, and between the sealing ring and the butterfly plate.

5. The triple eccentric butterfly valve according to claim 4, characterized in that: The parts of the valve seat and the wafer-type valve body that are in contact with the gasket are sealed in the form of water-tight threads, so as to increase the friction coefficients of the valve seat and the wafer-type valve body to the gasket.

6. The triple eccentric butterfly valve according to claim 5, characterized in that: The gasket is a graphite gasket.

7. The triple eccentric butterfly valve according to claim 1, characterized in that: The triple eccentric butterfly valve further comprises a positioning pin, which is arranged between the sealing ring and the butterfly plate.

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