Butterfly valve

Abstract

The utility model discloses a butterfly valve which comprises a valve body, a valve plate used for opening and closing an opening and closing opening of the valve body and a valve shaft arranged in the valve body and used for turning over the valve plate to open and close the opening and closing opening of the valve body, and an air inlet hole is formed in the portion, outside the valve shaft, of the valve body in a penetrating mode and used for filling pressurized gas into a gap between the inner surface of the valve body and the valve shaft. The air inlet holes are formed in the valve body outside the valve shaft in a penetrating manner, so that pressurized air can be input into a gap between the inner surface of the valve body and the valve shaft and a gap between the inner surface of the valve body and the periphery of the valve plate, powder is prevented from entering the gaps, the butterfly valve is effectively prevented from being stuck and damaged, the service life of the butterfly valve is prolonged, and the service life of the butterfly valve is prolonged. And the sealing performance of the butterfly valve can be improved.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to a butterfly valve. Background Art

[0002] At present, whether it is a powder device using imported butterfly valves or domestic butterfly valves, after a period of use, it is easy for relatively fine powder to enter the valve, causing the valve to get stuck and damaged.

[0003] The main reason is that there is a certain pressure inside the powder device (for example, about 30KPa), and the butterfly valves used in the powder device are all oil-free dry friction seals, so the valve shaft and seals and the valve plate and valve body need to have a certain gap to ensure the opening and closing action of the butterfly valve. This gap is generally very small, about 0.02-0.05mm. Under the action of pressure, powder with a particle size of less than 0.05mm will enter these gaps, thereby affecting the normal operation of the butterfly valve, damaging the butterfly valve, and reducing the service life of the butterfly valve. Utility Model Content

[0004] The purpose of the utility model is to solve or at least partially alleviate the above problems by providing a butterfly valve.

[0005] The utility model provides a butterfly valve, which comprises a valve body, a valve plate for opening and closing an opening and closing port of the valve body, and a valve shaft arranged in the valve body and used for flipping the valve plate to open and close the opening and closing port of the valve body, wherein an air inlet hole is penetrated through the valve body outside the valve shaft, for filling pressurized gas into the gap between the inner surface of the valve body and the valve shaft.

[0006] By setting an air inlet hole through the valve body outside the valve shaft, pressurized gas can be filled into the gap between the inner surface of the valve body and the valve shaft, so that the powder entering the valve body is blown out, effectively preventing the butterfly valve from getting stuck and damaged, and increasing the service life of the butterfly valve.

[0007] Preferably, the air inlet holes are arranged at opposite sides of the upper portion of the valve body.

[0008] Preferably, the number of the air inlet holes is two.

[0009] Preferably, the air inlet hole extends perpendicularly to the axis of the valve shaft.

[0010] Preferably, the air inlet hole is arranged at a position at the lower part of the valve body corresponding to the protruding end of the valve shaft.

[0011] Preferably, the air inlet holes are arranged at positions on opposite sides of the upper portion of the valve body and at positions at the lower portion of the valve body corresponding to the protruding end portion of the valve shaft.

[0012] Preferably, a protective gas device is further included, and an output pipe of the protective gas device is connected to the air inlet hole to fill pressurized protective gas into the gap between the inner surface of the valve body and the valve shaft.

[0013] Preferably, the protective gas device continuously fills the protective gas into the gap between the inner surface of the valve body and the valve shaft, and the pressure of the protective gas is greater than the working pressure inside the valve plate.

[0014] Preferably, the protective gas device is provided with a gas pressure regulating valve for adjusting the pressure of the protective gas filled in.

[0015] Preferably, the protective gas is argon or nitrogen.

[0016] Preferably, the protective gas is compressed air.

[0017] The butterfly valve designed by the utility model has the following benefits:

[0018] By setting the air inlet hole, pressurized protective gas can be continuously input into the gap between the inner surface of the valve body and the valve shaft of the butterfly valve and the gap between the periphery of the valve plate and the valve body, thereby preventing powder from entering the gap, so that the butterfly valve can maintain a normal working state, avoid premature damage, and extend the service life of the butterfly valve.

[0019] In addition, since the pressurized protective gas is continuously applied to the valve plate of the butterfly valve, the sealing performance of the butterfly valve can be further enhanced, and the processing accuracy requirements of the butterfly valve can be reduced, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0021] Figure 1 It is a schematic front cross-sectional view of an exemplary butterfly valve according to the utility model, showing the closed state of the butterfly valve.

[0022] Figure 2 yes Figure 1 Schematic side sectional view of a butterfly valve in an open state. DETAILED DESCRIPTION

[0023] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0024] It should also be noted that the upper part of the valve body and the lower part of the valve body described herein are relative to the attached drawings. The upper part of the valve body is the part of the valve body where the driving device is installed, which is located in the upper part of the attached drawings. In contrast, the end of the valve body opposite to the installation of the driving device can be called the lower part of the valve body, which is located in the lower part of the attached drawings. However, the description of "upper part of the valve body" and "lower part of the valve body" is only for the convenience of description and understanding, and does not constitute any limitation on the scope of protection of the utility model.

[0025] In powder devices, butterfly valves are usually used as valves to control the feed amount. Due to the special nature of powder materials, oil-free lubrication and dry sealing must be used. In this way, if the clearance between the parts is too small, it will not turn, and if the clearance is too large, it will cause air leakage and powder leakage, and the powder will drill into the valve.

[0026] In view of this situation, the utility model provides an air inlet hole on the valve body of the butterfly valve, through which pressurized protective gas can be filled into the gap between the inner surface of the valve body and the valve shaft and into the gap between the inner surface of the valve body and the periphery of the valve plate, so as to prevent powder jamming, ensure the working performance of the butterfly valve, and extend the service life of the butterfly valve.

[0027] The butterfly valve of the utility model comprises a valve body, a valve plate for opening and closing the opening and closing port of the valve body, and a valve shaft arranged in the valve body and used for flipping the valve plate to open and close the opening and closing port of the valve body, wherein an air inlet hole is penetrated through the valve body outside the valve shaft, and is used for filling pressurized gas into the gap between the inner surface of the valve body and the valve shaft and the gap between the inner surface of the valve body and the periphery of the valve plate, thereby preventing powder from entering the said gap, effectively preventing the butterfly valve from being stuck and damaged, and improving the service life of the butterfly valve.

[0028] In a preferred embodiment, the air inlet holes are arranged at opposite sides of the upper portion of the valve body. Pressurized protective gas is charged from two directions on opposite sides of the upper portion of the valve body, which can effectively prevent powder from entering the upper portion of the valve body.

[0029] Since the valve shaft that drives the valve plate to flip is installed in the upper part of the valve body, if powder enters the gap between the inner surface of the valve body and the valve shaft at the upper part of the valve body, the valve shaft may be unable to rotate over time, causing the butterfly valve to fail to work properly. Therefore, it is very necessary to prevent powder from entering the upper part of the valve body. By setting air inlet holes at the two opposite sides of the upper part of the valve body, pressurized gas can be filled into the gap between the inner surface of the valve body and the valve shaft from two directions on the side of the valve body through the air inlet holes, which can effectively prevent powder from entering the gap, especially prevent powder from staying around the valve shaft, and then with the introduction of air flow, gas can also enter the gap between the inner surface of the valve body and the periphery of the valve plate, thereby effectively preventing powder from entering the gap between the inner surface of the valve body and the periphery of the valve plate, and preventing the valve plate from being stuck with powder and stuck.

[0030] In a preferred embodiment, the number of air inlets is two, and the air inlets extend perpendicularly to the axis of the valve shaft. That is, an air inlet perpendicular to the axis is provided at two opposite sides of the upper portion of the valve body. More air inlets are also possible, but from the perspective of structural optimization and the aspect of preventing powder accumulation, it is preferred to provide two air inlets. Air inlets angled to the axial direction are also possible, but the effect of preventing powder from entering the gap is not as good as that of air inlets perpendicular to the axis.

[0031] In a preferred embodiment, the air inlet hole can be arranged at a position corresponding to the extended end of the valve shaft at the lower part of the valve body. The extended end of the valve shaft at the lower part of the valve body is also prone to powder accumulation. Since the extended end of the valve shaft is short, the powder can be effectively blown out by axially filling the pressurized protective gas into the gap between the valve shaft and the inner surface of the valve body. At the same time, this position is also the closest to the gap between the inner surface of the valve body and the periphery of the valve plate, and the gas filled in can enter the gap more easily.

[0032] In a particularly preferred embodiment, the air inlet holes can be simultaneously arranged at the positions on the two opposite sides of the upper part of the valve body and at the positions of the lower part of the valve body corresponding to the extended end of the valve shaft. Thus, by inputting pressurized protective gas at the two opposite sides of the upper part of the valve body and axially at the lower part of the valve body, powder can be completely prevented from entering the gap between the inner surface of the valve body and the valve shaft and the periphery of the valve plate, so as to more effectively prevent the butterfly valve from getting stuck and protect the valve body, valve plate and valve shaft from being affected by powder.

[0033] In a preferred embodiment, a protective gas device is further included, and an output pipe of the protective gas device is connected to the air inlet hole to fill the pressurized protective gas into the gap between the inner surface of the valve body and the valve shaft.

[0034] The pressurized protective gas can not only blow out the powder that enters the valve body, but also after the valve plate closes and seals the opening and closing port of the valve body, the pressurized protective gas blown out from the upper part of the valve body effectively applies sealing air pressure to the outside of the valve plate, thereby improving the sealing performance of the pipeline sealed by the valve body. The protective gas device continuously fills the protective gas, which is equivalent to applying air pressure in the gap between the inner surface of the valve body and the periphery of the valve plate to prevent the internal gas from leaking out of the gap, thereby improving the sealing performance. The conventional method is to improve the sealing performance of the butterfly valve by improving the matching accuracy of the inner surface of the valve body and the periphery of the valve plate. In this regard, the butterfly valve of the present application can improve the sealing performance without improving the matching accuracy of the inner surface of the valve body and the periphery of the valve plate, thereby reducing the cost and processing difficulty of butterfly valves with high sealing performance.

[0035] In a preferred embodiment, the protective gas device continuously fills the pressurized protective gas into the gap between the inner surface of the valve body and the valve shaft, and the pressure of the protective gas is greater than the working pressure inside the valve plate. By continuously filling the gap between the inner surface of the valve body and the valve shaft and the gap between the inner surface of the valve body and the periphery of the valve plate with pressurized protective gas, powder can be prevented from entering the gap at all times, whether the valve plate is opened for feeding or the valve plate is closed for processing powder. Making the pressure of the protective gas greater than the working pressure inside the valve plate can effectively prevent powder jamming, and because the gas pressure is higher than the working pressure inside the valve plate, it is more conducive to the sealing of the butterfly valve.

[0036] In a preferred embodiment, the protective gas device is provided with a gas pressure regulating valve on the gas pipeline for adjusting the pressure of the protective gas charged. One of the functions of such a setting is to stably provide pressurized protective gas, and another function is to adjust the pressure of the charged protective gas according to the different pressures of different powders processed by the powder device.

[0037] In a preferred embodiment, depending on the type of powder processed by the powder device, especially when processing powder that is easily oxidized, the protective gas can be an inert gas such as argon or nitrogen.

[0038] In a preferred embodiment, when the powder device processes powder that will not be oxidized, the protective gas may be cheaper compressed air.

[0039] The utility model is described in detail below in conjunction with the accompanying drawings.

[0040] Figure 1 is a schematic front cross-sectional view of an exemplary butterfly valve according to the present utility model, showing a closed state of the butterfly valve; Figure 2 yes Figure 1 Schematic side sectional view of a butterfly valve in an open state.

[0041] As shown in the figure, the butterfly valve 1 mainly includes a valve body 2, a valve plate 3 for opening and closing the opening and closing port of the valve body 2, and a valve shaft 4 arranged in the valve body 2 for flipping the valve plate 3 to open and close the opening and closing port of the valve body 2. There is a shaft seal 9 between the valve shaft 4 and the valve body 2, and a seal 8 arranged on the valve body 2 and engaged with the valve plate 3 when it is in a closed position. A drive device (not shown), such as a pneumatic drive device or a mobile phone drive device, can be installed at the upper end of the valve body 2. The drive device is engaged with the part of the valve shaft 4 extending out of the valve body 2 to drive the valve shaft 4 to rotate, thereby driving the valve plate 3 fixed to the valve shaft 4 to flip, so as to open (such as Figure 2 as shown) and closed (as Figure 1 (shown) Butterfly valve 1.

[0042] When the butterfly valve 1 is installed on a powder device, for example, the feeding and discharging of the powder is controlled by the butterfly valve 1. Since there is a gap between the inner surface of the valve body 2 and the valve shaft 4 or the periphery of the valve body 2, or there is a gap between the seal 9 between the valve shaft 4 and the valve body 2 and the valve shaft 4 and the valve body 2, when the powder particle size is smaller than the gap size, the powder is easy to enter the gap when the powder device is working, and there is usually a certain pressure in the powder device, which is more likely to promote the powder to enter the gap, thereby seriously affecting the functionality of the butterfly valve, such as causing the valve plate to be loosely closed, and even causing the butterfly valve to be stuck and damaged, leaking powder or air. In addition, if it is desired to control the powder flow by controlling the opening of the butterfly valve plate 3, the butterfly valve will also be unable to perform accurate flow control.

[0043] In order to overcome the above problems, the butterfly valve 1 of the present invention is provided with an air inlet hole on the valve body 2 outside the valve shaft. The air inlet hole can be connected to an output pipe (not shown) of a protective gas device (not shown). The protective gas device can be any device that provides pressurized gas, as long as it can continuously provide gas at a certain pressure. The output pipe of the protective gas device is connected to the air inlet hole on the valve body to fill the pressurized protective gas into the gap between the inner surface of the valve body and the valve shaft. The connection method of the output pipe of the protective gas device and the air inlet hole on the valve body can be a sealed and detachable connection method.

[0044] Specifically, in Figure 1 and Figure 2 In the example shown, the butterfly valve 1 of the present invention is provided with an air inlet hole through the upper part of the valve body 2. In this example, the air inlet holes are two air inlet holes 5 and an air inlet hole 6 provided at opposite sides of the upper part of the valve body 2. The air inlet holes may include a plurality of air inlet holes and may be provided at any position on the upper part of the valve body, as long as the position is staggered with the shaft seal 13. The output pipe of the protective device may be connected to the two air inlet holes 5 and 6, respectively, so as to fill the pressurized gas into the gap between the inner surface of the valve body 2 and the valve shaft 4 and between the inner surface of the valve body 2 and the periphery of the valve plate 3.

[0045] In addition, an air inlet hole 7 is provided on the valve body 2 at the lower part of the valve body 2 outside the extended end of the valve shaft 4. The air inlet hole 7 at this position is closest to the gap between the periphery of the valve plate 3 and the inner surface of the valve body 2, and it is easy to fill the gas into the gap. There can also be more than one air inlet hole 7, and it can be set at any position in the lower part of the valve body. In this example, the output pipe of the protective gas device can be connected to the air inlet hole 7, so that the pressurized gas is filled into the gap between the inner surface of the valve body and the valve shaft and the gap between the inner surface of the valve body and the periphery of the valve plate from the axial direction of the valve shaft at the lower part of the valve body.

[0046] The output pipe of the protective gas device can also be provided with a pressure regulating valve to adjust the pressure of the protective gas. The pressure of the protective gas can be determined according to the pressure value of the butterfly valve pipeline, that is, the pressure acting on the valve plate 3. The pressure of the protective gas should be greater than the working pressure on the valve plate 3. And the protective gas should be continuously filled to prevent the powder from entering the gap between the inner surface of the valve body and the valve shaft. Through experimental comparison, the pressure value of the protective gas is 10-20% higher than the pressure value of the butterfly valve pipeline, which has the best effect.

[0047] Depending on the material processed by the powder device, the type of shielding gas can be compressed air, or an inert gas such as argon or nitrogen, or other types of inert gases.

[0048] In the above-mentioned preferred embodiment of the utility model, pressurized protective gas is continuously filled in all directions from the upper and lower parts of the valve body of the butterfly valve 1, from the two sides of the valve shaft and from the axial direction of the valve shaft, thereby effectively preventing the butterfly valve from getting stuck and damaged, and significantly extending the service life of the butterfly valve.

[0049] Through our many tests, we found that this method can extend the service life of the butterfly valve by 100%. That is to say, a butterfly valve that could only be used for half a year can now be used for one year.

[0050] The present application is not limited to the specific embodiments shown in the figures, and various embodiments of the present application can be realized by various combinations of the positions of the air inlet holes, the angles of the air inlet holes about the axis, and the number of the air inlet holes, and these embodiments are all within the protection scope of the present application. Figure 1 The air inlet holes are arranged in a plane parallel to the valve plate in the closed position, and can also be arranged in a plane perpendicular to the valve plate in the closed position, or in both planes at the same time. The number can be two, four, and so on.

[0051] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A butterfly valve, characterized in that: It includes a valve body, a valve plate for opening and closing the opening and closing port of the valve body, and a valve shaft arranged in the valve body for flipping the valve plate to open and close the opening and closing port of the valve body, wherein an air inlet hole is penetrated through the valve body outside the valve shaft for filling pressurized gas into the gap between the inner surface of the valve body and the valve shaft.

2. The butterfly valve according to claim 1, characterized in that: The air inlet holes are arranged at two opposite sides of the upper part of the valve body.

3. The butterfly valve according to claim 2, characterized in that: The number of air intake holes is two.

4. The butterfly valve according to claim 1, characterized in that: The air inlet hole extends perpendicularly to the axis of the valve shaft.

5. The butterfly valve according to any one of claims 1 to 4, characterized in that: The air inlet hole is arranged at a position of the lower part of the valve body corresponding to the protruding end of the valve shaft.

6. The butterfly valve according to claim 5, characterized in that: It also includes a protective gas device, the output pipe of which is connected to the air inlet hole so as to fill the pressurized protective gas into the gap between the inner surface of the valve body and the valve shaft.

7. The butterfly valve according to claim 6, characterized in that: The protective gas device continuously fills the protective gas into the gap between the inner surface of the valve body and the valve shaft, and the pressure of the protective gas is greater than the working pressure on the inner side of the valve plate.

8. The butterfly valve according to claim 6 or 7, characterized in that: The protective gas device is provided with a gas pressure regulating valve for adjusting the pressure of the protective gas filled in.

9. The butterfly valve according to claim 6 or 7, characterized in that: The shielding gas is argon or nitrogen.

10. The butterfly valve according to claim 6 or 7, characterized in that: The shielding gas is compressed air.

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