Non-return air valve

Abstract

The utility model provides a non-return air valve. The non-return air valve comprises a valve body, a rotating shaft, rotating vanes and an indicator. One end of the valve body is an air inlet, and the other end of the valve body is an air outlet. The rotating shaft is rotationally arranged on the valve body and partially located in the ventilation channel, and one end of the rotating shaft is located outside the valve body. The rotating vane is connected with the rotating shaft and located in the ventilating duct, the rotating vane is provided with a first position for closing the ventilating duct and a second position for opening the ventilating duct, and the rotating vane can rotate relative to the valve body and can be switched between the first position and the second position. The indicator is connected with the end, located outside the valve body, of the rotating shaft, the rotating vane can drive the rotating shaft to rotate so that the rotating shaft can drive the indicator to rotate, and the indicator is used for indicating the first position and the second position of the rotating vane. And an inspector finds the fault of the rotating vane through the indicator, so that the function failure of the non-return air valve is found, the non-return air valve is maintained in time, and unnecessary loss is avoided.

Description

Technical Field

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

[0002] The check valve is a valve body that prevents air from flowing backwards. When the wind flows forward, the rotor inside the check valve rotates and opens, allowing the wind to pass through the check valve. When the wind flows backwards, the rotor closes to prevent the wind from flowing backwards. If the check valve is used for too long, the rotor will rust and become unable to rotate. The inspectors are unable to detect the rotor failure in time, resulting in the failure of the check valve function and unnecessary losses. Summary of the invention

[0003] One purpose of the utility model is to solve the technical problem in the prior art that the rotation of the rotating blades inside the check air valve cannot be observed from the outside of the check air valve.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] The utility model provides a non-return air valve, comprising:

[0006] A valve body, wherein the valve body has a ventilation passage, and one end of the valve body is an air inlet, and the other end is an air outlet;

[0007] A rotating shaft, the rotating shaft is rotatably disposed on the valve body, the rotating shaft portion is located in the ventilation passage, and one end of the rotating shaft is located outside the valve body;

[0008] a rotary vane, the rotary vane being connected to the rotating shaft and being located in the ventilation passage, the rotary vane having a first position for closing the ventilation passage and a second position for opening the ventilation passage, the rotary vane being rotatable relative to the valve body and switching between the first position and the second position; and

[0009] An indicator mark is connected to one end of the rotating shaft located outside the valve body, and the rotating vane can drive the rotating shaft to rotate, so that the rotating shaft drives the indicator mark to rotate, and the indicator mark is used to indicate the first position and the second position of the rotating vane.

[0010] In one embodiment, when the indicator indicates the first position of the rotary vane, the indicating direction of the indicator is perpendicular to the axial direction of the valve body.

[0011] In one embodiment, when the indicator indicates the second position of the rotary vane, the indicating direction of the indicator is arranged at an acute angle or in parallel with the axial direction of the valve body.

[0012] In one embodiment, the indicator mark includes a connecting portion and an indicating portion, the connecting portion is connected to the rotating shaft and the indicating portion respectively, the indicating direction of the indicator mark is from the connecting portion to the indicating portion, and the width of the indicating portion gradually decreases in a direction away from the connecting portion.

[0013] In one embodiment, the check air valve further includes a limit member, which is disposed on the inner wall of the valve body. When the rotating blade is located at the first position, the rotating blade presses against the limit member on the side facing the air inlet, and the limit member is used to limit the rotating blade from rotating toward the air inlet.

[0014] In one embodiment, the rotating blade is divided into a first part and a second part by the rotating shaft, the area of ​​the first part is larger than the area of ​​the second part, and when the rotating blade is in the first position, the first part abuts against the limiting member.

[0015] In one of the embodiments, the valve body is a cylindrical structure, and the vertical distance between the axis of the rotating shaft and the center of the cross section of the valve body is 2 / 5 to 3 / 5 of the radius of the valve body.

[0016] In one embodiment, the rotating blade is provided with a first mounting seat and a second mounting seat, the first mounting seat is provided with a first through hole, the second mounting seat is provided with a second through hole, the two ends of the rotating shaft are respectively passed through the first through hole and the second through hole, and the first through hole and the second through hole are coaxially arranged.

[0017] In one of the embodiments, the check air valve further includes a pressure relief structure, which is disposed in the valve body. When the rotary vane is in the first position, the pressure relief structure is used to allow air to overflow from the air outlet to the air inlet.

[0018] In one embodiment, the pressure relief structure is a gap between the rotating vane and the inner wall of the valve body.

[0019] It can be seen from the above technical solution that the utility model has at least the following advantages and positive effects:

[0020] In the utility model, when there is no air flow in the ventilation duct, the vane is in the first position to close the ventilation duct. The indicator indicates the first position of the vane. When wind enters the ventilation duct of the valve body from the air inlet, the wind will blow the vane to rotate. The vane drives the rotating shaft to rotate. The rotating shaft drives the indicator to rotate. That is, the vane and the indicator will rotate synchronously, and the vane is in the second position to open the ventilation duct. The indicator indicates the second position of the vane. The inspector can observe whether the vane closes or opens the ventilation duct through the indicator. When wind enters the ventilation duct, the vane cannot rotate due to a malfunction, and the indicator will not rotate either. The indicator still indicates the first position of the vane. The inspector discovers the malfunction of the vane through the indicator, thereby discovering the malfunction of the check valve, and repairs the check valve in time to avoid unnecessary losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a check air valve in an embodiment of the utility model.

[0022] Figure 2 It is a structural schematic diagram of a non-return air valve in an embodiment of the utility model from another angle.

[0023] The following are the descriptions of the reference numerals:

[0024] 100, valve body; 110, ventilation duct;

[0025] 200, rotating shaft;

[0026] 300, rotor blade; 310, first part; 320, second part; 330, first mounting seat; 340, second mounting seat;

[0027] 400, indicator; 410, connecting portion; 420, indicating portion;

[0028] 500. Limiting parts. DETAILED DESCRIPTION

[0029] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes rather than for limiting the present invention.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0031] In one embodiment, if Figure 1 and Figure 2 As shown, a non-return air valve includes a valve body 100. The valve body 100 may be cylindrical. A ventilation passage 110 is provided in the valve body 100. One end of the valve body 100 is an air inlet, and the other end is an air outlet. After the air enters the ventilation passage 110 from the air inlet, the air is blown out from the air outlet.

[0032] Specifically, a non-return air valve further includes a rotating shaft 200. The rotating shaft 200 is rotatably disposed on the valve body 100. The rotating shaft 200 penetrates the valve body 100 and enters the ventilation passage 110 and is inserted into the inner wall of the valve body 100. The rotating shaft 200 can rotate relative to the valve body 100. The rotating shaft 200 is partially located in the ventilation passage 110, and one end of the rotating shaft 200 is located outside the valve body 100. More specifically, the rotating shaft 200 is disposed in the middle of the valve body 100. The middle of the valve body 100 is specifically the central position along the axial direction of the valve body 100.

[0033] More specifically, the valve body 100 is a cylindrical structure, and the vertical distance between the axis of the rotating shaft 200 and the center of the cross section of the valve body 100 is 2 / 5 to 3 / 5 of the radius of the valve body 100 .

[0034] More specifically, a non-return air valve further includes a rotating vane 300. The rotating vane 300 is connected to the rotating shaft 200. The rotating vane 300 is specifically fixedly connected to the rotating shaft 200 so that the rotating shaft 200 and the rotating vane 300 rotate synchronously. The rotating vane 300 is located in the ventilation duct 110.

[0035] It should be noted that the vane 300 has a first position for closing the ventilation passage 110 and a second position for opening the ventilation passage 110. When the vane 300 is in the first position, the plane where the vane 300 is located is perpendicular to the axial direction of the valve body 100 to close the ventilation passage 110. When the vane 300 is in the second position, the plane where the vane 300 is located is parallel to the axial direction of the valve body 100, and the vane 300 completely opens the ventilation passage 110.

[0036] Specifically, the vane 300 can rotate relative to the valve body 100 and switch between a first position and a second position. When there is no wind, the vane 300 flips downward under its own weight, and the vane 300 is in the first position to close the ventilation passage 110. When there is wind, the wind blows the vane 300 and the vane 300 can flip upward under the wind force, and the vane 300 is in the second position to open the ventilation passage 110.

[0037] Please refer to Figure 2 In one embodiment, the rotor 300 is divided into a first part 310 and a second part 320 by the rotating shaft 200. The area of ​​the first part 310 is larger than the area of ​​the second part 320. When the rotor 300 is in the first position, the first part 310 abuts against the stopper 500. Specifically, when there is no wind flow, the rotor 300 is in the first position, and the first part 310 of the rotor 300 turns downward under its own weight. When there is wind flow, the rotor 300 is in the second position, and the wind blows the first part 310 of the rotor 300 to turn upward.

[0038] In one embodiment, the rotor 300 is provided with a first mounting seat 330 and a second mounting seat 340. The first mounting seat 330 is provided with a first through hole. The second mounting seat 340 is provided with a second through hole. The rotating shaft 200 is passed through the first through hole and the second through hole. The rotating shaft 200 is fixedly connected to the inner side walls of the first through hole and the second through hole respectively. The first through hole and the second through hole are coaxially arranged. The rotor 300 is connected to the rotating shaft 200 through the first mounting seat 330 and the second mounting seat 340, so that the rotor 300 and the rotating shaft 200 rotate synchronously.

[0039] The first mounting seat 330 and the second mounting seat 340 are both disposed on a side surface of the rotor 300. When the rotor 300 is in the first position, the first mounting seat 330 and the second mounting seat 340 are closer to the air inlet than the rotor 300. The first mounting seat 330 and the second mounting seat 340 may be mounting plates. The plane where the mounting plates are located is disposed perpendicularly to the axis of the rotating shaft 200.

[0040] Please refer to Figure 1 A check valve further includes an indicator mark 400. The indicator mark 400 is connected to one end of the rotating shaft 200 located outside the valve body 100, so that the inspector can know the rotation status of the rotating blade 300 through the external indicator mark 400.

[0041] Specifically, the indicator 400 is located in the middle of the valve body 100. The rotating blade 300 can drive the rotating shaft 200 to rotate, so that the rotating shaft 200 drives the indicator 400 to rotate. The indicator 400 is used to indicate the first position and the second position of the rotating blade 300. The indicator 400 is vertically connected to the rotating shaft 200.

[0042] Specifically, when the indicator 400 indicates the first position of the rotor 300, the indicating direction of the indicator 400 is perpendicular to the axial direction of the valve body 100. Figure 1 From the perspective shown, the axial direction of the valve body 100 is horizontal, and the vanes 300 are arranged vertically to close the ventilation passage 100. The indicating direction of the indicator 400 is the same as the arrangement direction of the vanes 300, that is, the indicating direction of the indicator 400 is vertical.

[0043] More specifically, when the indicator 400 indicates the second position of the rotor 300, the indicating direction of the indicator 400 is set at an acute angle or parallel to the axial direction of the valve body 100. The axial direction of the valve body 100 is the direction from the air inlet to the air outlet. When the wind force is small, the rotor 300 partially opens the ventilation passage 110, and the indicating direction of the indicator 400 is set at an acute angle to the axial direction of the valve body 100. When the wind force is large, the rotor 300 completely opens the ventilation passage 110, and the plane where the rotor 300 is located is set parallel to the axial direction of the valve body 100, that is, the indicating direction of the indicator 400 is set parallel to the axial direction of the valve body 100.

[0044] In one embodiment, the indicator 400 includes a connecting portion 410 and an indicating portion 420. The connecting portion 410 is connected to the rotating shaft 200 and the indicating portion 420 respectively. The indicating direction of the indicator 400 is from the connecting portion 410 to the indicating portion 420. The width of the indicating portion 420 gradually decreases in the direction away from the connecting portion 410. The indicating portion 420 is specifically an arrow structure. The indicating direction of the arrow structure is the indicating direction of the indicator 400. Specifically, the connecting portion 410 and the indicating portion 420 are an integrally formed structure.

[0045] During operation, when there is no air flow in the ventilation passage 110, the vane 300 is in the first position of closing the ventilation passage 110. The indicator 400 indicates the first position of the vane 300. When wind enters the ventilation passage 110 of the valve body 100 from the air inlet, the wind will blow the vane 300 to rotate. The vane 300 drives the rotating shaft 200 to rotate. The rotating shaft 200 drives the indicator 400 to rotate. That is, the vane 300 and the indicator 400 will rotate synchronously, and the vane 300 is in the second position of opening the ventilation passage 110. The indicator 400 indicates the second position of the vane 300. The inspector can observe whether the vane 300 closes or opens the ventilation passage 110 through the indicator 400. When wind enters the ventilation passage 110, the vane 300 cannot rotate due to a malfunction, and the indicator 400 will not rotate either. The indicator 400 still indicates the first position of the vane 300. The inspector finds the fault of the rotor blade 300 through the indicator mark 400, thereby discovering the malfunction of the check air valve, and repairs the check air valve in time to avoid unnecessary losses.

[0046] In this embodiment, the non-return air valve further includes a limiter 500. The limiter 500 is disposed on the inner side wall of the valve body 100. When the rotary vane 300 is located at the first position, the limiter 500 is disposed close to the air inlet relative to the rotary vane 300, and the side of the rotary vane 300 facing the air inlet abuts against the limiter 500. The limiter 500 is used to limit the rotation of the rotary vane 300 toward the air inlet. When the wind flows from the air inlet to the air outlet, the end of the rotary vane 300 abutting against the limiter 500 rotates in a direction away from the limiter 500 to open the ventilation duct 110. When the wind flows from the air outlet to the air inlet, the rotary vane 300 abuts against the limiter 500 and does not rotate. The rotary vane 300 still closes the ventilation duct 110, so that the wind cannot flow from the air outlet to the air inlet, so that the wind can only flow in one direction, thereby ensuring the one-way flow function of the non-return air valve.

[0047] Specifically, the first portion 310 of the rotor blade 300 abuts against the stopper 500. The area of ​​the first portion 310 is greater than the area of ​​the second portion 320. In the absence of wind, the first portion 310 turns downward and abuts against the stopper 500.

[0048] More specifically, the stopper 500 is a semicircular raised portion that matches the outer circumference of the rotor blade 300, increasing the contact area between the raised portion and the rotor blade 300 without affecting ventilation, so that the rotor blade 300 can stably contact the raised portion.

[0049] In this embodiment, the check valve further includes a pressure relief structure. The pressure relief structure is disposed in the valve body 100. When the rotor 300 is in the first position, the pressure relief structure is used to allow air to overflow from the air outlet to the air inlet. When the wind flows in the reverse direction and the air volume is large, if the rotor 300 completely closes the ventilation duct 110, the pressure in the ventilation duct 110 is large, and the ventilation duct 110 is easily damaged. By providing the pressure relief structure, a small part of the wind can flow in the reverse direction from the pressure relief structure, reducing the pressure in the ventilation duct 110 and reducing the risk of the ventilation duct 110 being damaged.

[0050] Specifically, the pressure relief structure is a gap between the rotor blade 300 and the inner wall of the valve body 100. When the wind flows in the reverse direction, a small part of the wind can flow through the gap between the rotor blade 300 and the inner wall of the valve body 100 to reduce the pressure in the ventilation duct 110. In addition, the gap between the rotor blade 300 and the inner wall of the valve body 100 can provide space for the rotation of the rotor blade 300, avoiding the outer periphery of the rotor blade 300 from contacting and rubbing with the inner wall of the valve body 100, which affects the normal rotation of the rotor blade 300. More specifically, the distance of the gap is the difference between the diameter of the inner wall of the valve body 100 and the diameter of the rotor blade 300. The distance of the gap can be 1 to 6 mm.

[0051] In other embodiments, the pressure relief structure may also be a ventilation gap provided on the rotor blade 300. The ventilation gap may be a narrow and long hole. When the wind flows in the reverse direction, a small part of the wind can flow through the ventilation gap.

[0052] Although the utility model has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the utility model can be implemented in various forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A check air valve, characterized in that: include: A valve body, wherein the valve body has a ventilation passage, and one end of the valve body is an air inlet, and the other end is an air outlet; A rotating shaft, the rotating shaft is rotatably disposed on the valve body, the rotating shaft portion is located in the ventilation passage, and one end of the rotating shaft is located outside the valve body; a rotating vane, the rotating vane being connected to the rotating shaft and being located in the ventilation passage, the rotating vane having a first position for closing the ventilation passage and a second position for opening the ventilation passage, the rotating vane being rotatable relative to the valve body and switching between the first position and the second position; and An indicator mark is connected to one end of the rotating shaft located outside the valve body, and the rotating vane can drive the rotating shaft to rotate, so that the rotating shaft drives the indicator mark to rotate, and the indicator mark is used to indicate the first position and the second position of the rotating vane.

2. The check air valve according to claim 1, characterized in that: When the indicator mark indicates the first position of the rotating vane, the indicating direction of the indicator mark is perpendicular to the axial direction of the valve body.

3. The check air valve according to claim 1, characterized in that: When the indicator mark indicates the second position of the rotary vane, the indicating direction of the indicator mark is arranged at an acute angle or in parallel with the axial direction of the valve body.

4. The check air valve according to claim 1, characterized in that: The indicator mark includes a connecting portion and an indicating portion, the connecting portion is connected to the rotating shaft and the indicating portion respectively, the indicating direction of the indicator mark is from the connecting portion to the indicating portion, and the width of the indicating portion gradually decreases in a direction away from the connecting portion.

5. The check air valve according to claim 1, characterized in that: The check air valve also includes a limit member, which is arranged on the inner wall of the valve body. When the rotating blade is in the first position, the side of the rotating blade facing the air inlet presses against the limit member, and the limit member is used to limit the rotating blade from rotating toward the air inlet.

6. The check air valve according to claim 5, characterized in that: The rotating blade is divided into a first part and a second part by the rotating shaft, the area of ​​the first part is larger than the area of ​​the second part, and when the rotating blade is in the first position, the first part abuts against the limiting member.

7. The check air valve according to claim 1, characterized in that: The valve body is a cylindrical structure, and the vertical distance between the axis of the rotating shaft and the center of the cross section of the valve body is 2 / 5 to 3 / 5 of the radius of the valve body.

8. The check air valve according to claim 1, characterized in that: The rotating blade is provided with a first mounting seat and a second mounting seat, the first mounting seat is provided with a first through hole, the second mounting seat is provided with a second through hole, the two ends of the rotating shaft are respectively penetrated through the first through hole and the second through hole, and the first through hole and the second through hole are coaxially arranged.

9. The check air valve according to claim 1, characterized in that: The check air valve further includes a pressure relief structure, which is disposed in the valve body. When the rotating vane is in the first position, the pressure relief structure is used to allow air to overflow from the air outlet to the air inlet.

10. The check air valve according to claim 9, characterized in that: The pressure relief structure is a gap between the rotating vane and the inner wall of the valve body.

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