Guiding type anti-scouring stop valve

Abstract

A guide type anti-scouring stop valve belongs to the technical field of valves, and comprises a valve body, a valve core is slidably connected in the valve body, the valve core is connected with a hand wheel through a valve rod, an installation cavity is arranged in the valve body along the sliding direction of the valve core, and the installation cavity is communicated with the valve rod. A sleeve assembly used for throttling and pressure reducing is installed in the installation cavity in a sealed mode, and the valve element is coaxially connected into the sleeve assembly in a sliding mode. The check valve has the advantages that the problems of large noise and large vibration in the working process can be fundamentally solved, it can be guaranteed that the sealing face of the valve element and the sealing face of the valve body are always located in the same center in the flowing process of media, and the sealing reliability is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a guided anti-scour stop valve. Background Art

[0002] In the prior art, some stop valves are directly discharged into the air, such as the detection valve on the garbage power generation boiler. Due to the large pressure difference of the valve, when the valve is opened, the inlet end of the valve is always under high pressure, while the outlet end is basically the same as the atmospheric pressure. The medium will exert an impact on the valve core, causing the valve core to be at a different center from the valve body sealing surface when closed, resulting in internal leakage. The generation of internal leakage will also cause erosion of the sealing surface, seriously damaging the sealing structure of the valve body and valve core; causing vibration, loud noise, and quickly damaging the valve, wasting a lot of energy.

[0003] For example, the patent with publication number CN104344072A discloses a stop valve installed with a stop valve seal. The sealing performance of the stop valve is good, but there is still a problem that when the pressure difference is large, when the valve is opened, the medium will generate an impact on the valve core, so that the valve core and the valve body sealing surface are not in the same center when closed, resulting in internal leakage, and it still cannot solve the problem raised in this application.

[0004] Due to the serious erosion of the valve seat and the valve core sealing surface, the valve core vibrates severely and makes a lot of noise at a small opening, and the stop valve cannot be suspended in the middle position. In fact, this valve often works at a small opening and half opening. Therefore, the valve core and the valve stem are suspended in the valve cavity, which will produce sharp vibrations, seriously damaging the internal parts of the valve and generating a lot of noise. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a guided anti-scour stop valve, which can fundamentally solve the problems of loud noise and vibration during operation, and can ensure that the sealing surface of the valve core and the sealing surface of the valve body are always at the same center during the flow of the medium, thereby ensuring the reliability of the seal.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model to solve its technical problem is: the guided anti-scour stop valve includes a valve body, a valve core is slidably connected in the valve body, the valve core is connected to the handwheel through a valve stem, an installation cavity is provided in the valve body along the sliding direction of the valve core, a sleeve assembly for throttling and reducing pressure is sealed and installed in the installation cavity, and the valve core is coaxially slidably connected in the sleeve assembly.

[0007] The valve body is provided with a valve inlet and a valve outlet, and the valve inlet is communicated with the valve outlet through an installation cavity.

[0008] The sleeve assembly comprises a first sleeve installed in the installation cavity close to one end of the valve stem and a second sleeve installed in the installation cavity away from one end of the valve stem, wherein the first sleeve is in abutting connection with the second sleeve.

[0009] The outer periphery of the first sleeve is sealed and connected to the inner wall of the installation cavity through multiple groups of first sealing rings.

[0010] A throttling hole is arranged at one end of the first sleeve close to the valve inlet.

[0011] The outer periphery and the bottom end of the second sleeve are both sealedly connected to the inner wall of the installation cavity through a second sealing ring, and the upper end of the second sleeve is in sealing contact with an end of the valve core away from the valve stem through a third sealing ring.

[0012] A through hole communicating with the installation cavity is arranged at the center of the second sleeve, a flow channel coaxially communicating with the installation cavity is arranged on the valve body, and the through hole is communicated with the valve outlet through the flow channel.

[0013] A conical section is arranged at one end of the valve core away from the valve stem, and the conical section matches with the through hole; and a flared section is arranged at one end of the through hole close to the flow channel.

[0014] A balancing hole is axially arranged at the center of the valve core.

[0015] The beneficial effects of the utility model are:

[0016] The utility model installs the sleeve assembly in a sealing manner in the installation cavity of the valve body, so that the valve core slides coaxially in the sleeve assembly. The sleeve assembly can not only throttle and reduce pressure, thus fundamentally solving the disadvantages of high noise and high vibration, but also can play a guiding role in the process of valve switching. In the flow of the medium, the sealing surface of the valve core and the sealing surface of the valve body are always at the same center, thus ensuring the reliability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following is a brief description of the contents expressed in each of the drawings of the utility model specification and the marks in the drawings:

[0018] Figure 1 It is a full cross-sectional view of the utility model guided anti-scour stop valve;

[0019] The markings in the above figures are: 1. valve body, 11. installation cavity, 12. valve inlet, 13. valve outlet, 14. flow channel, 2. valve core, 21. tapered section, 22. balancing hole, 3. valve stem, 4. handwheel, 5. first sleeve, 51. throttle hole, 6. second sleeve, 61. through hole, 7. first sealing ring, 8. second sealing ring, 9. third sealing ring. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0021] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] The specific implementation scheme of the utility model is as follows: Figure 1 As shown, the utility model provides a guided anti-scour stop valve, including a valve body 1, a valve core 2 is slidably connected in the valve body 1, the valve core 2 is connected to a hand wheel 4 through a valve stem 3, an installation cavity 11 is provided in the valve body 1 along the sliding direction of the valve core 2, a sleeve assembly for throttling and reducing pressure is sealed and installed in the installation cavity 11, and the valve core 2 is coaxially slidably connected in the sleeve assembly. Rotating the operating hand wheel 4 causes the valve stem 3 to rotate, thereby driving the valve core 2 to slide along the axial direction of the sleeve assembly, and the sleeve assembly plays a guiding role. In the flow of the medium, the sealing surface of the valve core 2 and the sealing surface of the valve body 1 are always at the same center, which can ensure the reliability of the seal. In addition, a throttling and reducing pressure structure is provided on the sleeve assembly, and pressure adjustment can be performed during the valve opening and closing process, thereby avoiding the situation where the medium has a high pressure and scours the valve core 2, and fundamentally solving the problem of high noise and vibration during the operation of the valve.

[0024] Specifically, a valve inlet 12 and a valve outlet 13 are provided on the valve body 1 , and the valve inlet 12 is connected with the valve outlet 13 through the installation cavity 11 , thereby forming a flow channel for the medium.

[0025] Specifically, the sleeve assembly includes a first sleeve 5 installed in the installation cavity 11 near one end of the valve stem 3 and a second sleeve 6 installed in the installation cavity 11 away from one end of the valve stem 3 , and the first sleeve 5 is abutted against the second sleeve 6 .

[0026] The outer periphery of the first sleeve 5 is sealed and connected to the inner wall of the installation cavity 11 through multiple sets of first sealing rings 7, which prevents the medium from entering the installation cavity 11 near the valve stem 3 through the gap between the valve body 1 and the first sleeve 5, thereby preventing internal leakage. A throttle hole 51 is provided at the end of the first sleeve 5 near the valve inlet 12, and the aperture of the throttle hole 51 is smaller than the aperture of the valve inlet 12. When the medium enters the valve body 1 through the throttle hole 51 from the valve inlet 12, the pressure can be further reduced, thereby reducing the scouring of the valve core 2 and extending the service life of the valve core 2.

[0027] The outer periphery and the bottom end of the second sleeve 6 are sealed and connected to the inner wall of the installation cavity 11 through the second sealing ring 8, which prevents the medium from directly entering the valve outlet 13 through the gap between the second sleeve 6 and the valve body 1, thereby preventing internal leakage. The upper end of the second sleeve 6 is sealed and contacted with the end of the valve core 2 away from the valve stem 3 through the third sealing ring 9, thereby preventing the medium from entering the valve outlet 13 through the gap between the second sleeve 6 and the valve core 2 from the valve inlet 12 when the valve is closed, thereby preventing internal leakage. The center of the second sleeve 6 is provided with a through hole 61 communicating with the installation cavity 11, and the valve body 1 is provided with a flow channel 14 coaxially communicating with the installation cavity 11. The through hole 61 is connected to the valve outlet 13 through the flow channel 14, thereby forming a medium flow channel when the valve is opened. The end of the valve core 2 away from the valve stem 3 is provided with a tapered section 21. When the valve is closed, the tapered section 21 goes deep into the through hole 61. During the process of opening the valve, the distance the valve core 2 moves upward can form a change in flow rate, thereby playing a role in regulating pressure. In addition, the end of the through hole 61 close to the flow channel 14 is provided with a flared section, which can buffer and reduce pressure on the medium, and can further reduce the noise problem of valve operation.

[0028] In addition, a balancing hole 22 is axially arranged at the center of the valve core 2, which can reduce the opening and closing torque and make the opening and closing of the valve easier and more flexible.

[0029] In order to adapt to high temperature and high pressure corrosion resistance, the main parts are made of martensitic stainless steel. The valve core 2 and valve body 1 are made of D802 (cobalt-based alloy) after heat treatment and gas ion nitriding to improve the erosion resistance of the internal sealing surface.

[0030] The working principle of the stop valve is as follows: when the valve is opened, the valve core 2 moves up slowly, and the medium first contacts the outer wall of the first sleeve 5, so that the medium enters the valve cavity through the throttle hole 51 of the first sleeve 5. According to the Bernoulli principle, since the aperture of the throttle hole 51 is smaller than the inner diameter of the valve inlet 12, the medium flow speed increases and the pressure decreases, thereby reducing the scouring of the valve core 2 by the medium, thereby reducing the noise. The valve core 2 continues to move up, and the high-speed medium directly scours the bottom end of the valve core 2 after slowing down the pressure, and forms a throttling channel with the through hole 61 of the second sleeve 6. The flow rate changes as much as the valve core 2 moves up, and due to the second sleeve 6, the aperture of the medium outflow becomes smaller, thereby further reducing the pressure, so that the medium flows out from the valve outlet 13 through the flow channel 14 on the valve body 1 after multiple pressure reductions, thereby reducing the noise problem of the valve operation and extending the service life of the valve core 2.

[0031] In summary, the utility model can fundamentally solve the problems of loud noise and vibration during operation, and can ensure that the sealing surface of the valve core and the sealing surface of the valve body are always at the same center during the flow of the medium, thereby ensuring the reliability of the seal.

[0032] The above description is only used to illustrate some principles of the utility model. This specification is not intended to limit the utility model to the specific structure and application scope shown and described. Therefore, all corresponding modifications and equivalents that may be used belong to the patent scope applied for the utility model.

Claims

1. A guided anti-scour stop valve, comprising a valve body, a valve core slidably connected in the valve body, and the valve core is connected to a hand wheel through a valve stem, characterized in that: An installation cavity is provided in the valve body along the sliding direction of the valve core, a sleeve assembly for throttling and reducing pressure is sealed and installed in the installation cavity, and the valve core is coaxially slidably connected in the sleeve assembly; The valve body is provided with a valve inlet and a valve outlet, and the valve inlet is communicated with the valve outlet through a mounting cavity; the sleeve assembly comprises a first sleeve installed in the mounting cavity close to one end of the valve stem and a second sleeve installed in the mounting cavity away from one end of the valve stem, the first sleeve and the second sleeve are in contact with each other; a throttling hole is provided at one end of the first sleeve close to the valve inlet; a through hole communicated with the mounting cavity is provided at the center of the second sleeve, a flow channel coaxially communicated with the mounting cavity is provided on the valve body, and the through hole is communicated with the valve outlet through the flow channel; a tapered section is provided at one end of the valve core away from the valve stem, the tapered section cooperates with the through hole, and a flaring section is provided at one end of the through hole close to the flow channel.

2. The guided anti-scour stop valve according to claim 1, characterized in that: The outer periphery of the first sleeve is sealed and connected to the inner wall of the installation cavity through multiple groups of first sealing rings.

3. The guided anti-scour stop valve according to claim 1, characterized in that: The outer periphery and the bottom end of the second sleeve are both sealedly connected to the inner wall of the installation cavity through a second sealing ring, and the upper end of the second sleeve is in sealing contact with an end of the valve core away from the valve stem through a third sealing ring.

4. The guided anti-scour stop valve according to claim 1, characterized in that: A balancing hole is axially arranged at the center of the valve core.

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