Check valve and flue system
By setting a replica wing profile on the valve plate of the check valve, and using aerodynamic principles to improve the valve plate flip performance, the problems of complex structure and high cost of traditional check valves are solved, and more efficient smoke exhaust and lower production costs are achieved.
Patent Information
- Application Number
- CN202420929340.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-04-30
AI Technical Summary
Traditional check valves have complex structure and high cost problems in smoke exhaust systems, which affect the smoke exhaust efficiency and economy.
A check valve is designed, and its valve plate is equipped with a replica wing profile, which uses aerodynamic principles to make the valve plate more easily flipped, increasing the flip amplitude and stability, thereby reducing smoke exhaust resistance and increasing air exhaust volume.
By reducing smoke exhaust resistance and increasing air exhaust volume, the efficiency of smoke exhaust is improved. At the same time, due to the simple structure, production costs are reduced and it has good economicality.
Smart Images
Figure CN222823770U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of smoke exhaust equipment, in particular to a check valve and a flue system. Background Art
[0002] The exhaust system of a residential kitchen is usually composed of a range hood, a smoke exhaust pipe, a check valve, etc. The check valve is installed on the wall and connected to the outdoor space. When the stove is working, the smoke is sucked in through the range hood, passes through the smoke pipe, and the check valve is opened under the action of pressure, so that the smoke is discharged to the outside. Among them, the main function of the check valve is to prevent gas backflow, rainwater, and debris and insects from entering the room through the smoke pipe.
[0003] Since the check valve plays a role in the entire kitchen exhaust system, it also affects the exhaust efficiency to a certain extent. Although the current residential check valves, such as the double-valve check valve, can exhaust smoke smoothly, their relatively complex structure occupies the exhaust path space, which will have a certain impact on the exhaust effect; similar electric check valves are more expensive and less economical. Utility Model Content
[0004] In view of the technical problems of defects in traditional check valves, the utility model provides a check valve, the airfoil-shaped surface on the valve plate can utilize the principle of aerodynamics to make the valve plate easier to flip, with a larger flipping range and a more stable flipping effect, so as to better release the space occupied by the valve plate in the flue, increase the exhaust area, reduce the exhaust resistance, thereby increasing the exhaust volume and improving the exhaust efficiency. At the same time, the check valve has a simple structure, can greatly reduce the production cost, and has very good economic efficiency.
[0005] The technical solution provided by the utility model is as follows: a check valve comprises a valve body and a check structure; the valve body has a flue, and the flue has a smoke inlet and a smoke outlet; the check structure is arranged on the valve body to allow a fluid to flow in the flue from the smoke inlet to the smoke outlet in a one-way manner; the check structure comprises a valve plate, the valve plate is located in the flue cavity or at the smoke outlet or at the smoke inlet; the valve plate is rotatably connected to a position adjacent to the upper part of the flue to open or close the flue; the valve plate is away from the smoke inlet One side surface of the opening is provided with an airfoil-like surface and a main body surface, and the airfoil-like surface is closer to the rotation connection of the valve plate than the main body surface; when the valve plate is rotated to open the flue, the valve plate can form a first gap and a second gap with the flue, and the second gap is larger than the first gap. The first gap is the gap formed between the side surface of the valve plate away from the flue gas inlet and the upper part of the flue, and the second gap is the gap formed between the side surface of the valve plate facing the flue gas inlet and the upper part of the flue.
[0006] Optionally, the rotation centerline of the valve plate is located within a projection area of the imitation airfoil on the valve plate facing the valve plate direction.
[0007] Optionally, the cross-section of the airfoil-like surface is arched, the distance between the arc top of the arch and its chord length is h, the chord span of the arch is b, the length of the valve plate is L, and 3 / 12L≤b≤5 / 12L, 1 / 40L <h<1 / 24L。
[0008] Optionally, a distance from the rotation center of the valve plate to a vertex of the valve plate on a side away from the rotation center is l, satisfying 0.8L≤l≤0.9L.
[0009] Optionally, a rotating shaft is further included, and a through hole is provided on the valve plate, and the rotating shaft passes through the through hole to enable the valve plate to be rotatably connected to the flue.
[0010] Optionally, a cover body is further included, and a fixing piece is provided on the flue, and both ends of the rotating shaft are connected to the flue through the assembly of the cover body and the fixing piece.
[0011] Optionally, an oil baffle is provided on the inner wall of the lower portion of the flue, and the oil baffle at least partially extends toward the direction close to the flue gas inlet.
[0012] Optionally, the oil baffle includes an extension portion and a connection portion, the connection portion is connected to the inner wall of the lower portion of the flue, the extension portion extends toward the flue gas inlet, and a plurality of holes are provided on the extension portion.
[0013] Optionally, when the valve plate is located at the smoke outlet, the smoke outlet is inclined, and a limiting protrusion is provided at the lower part of the smoke outlet, and the limiting protrusion can abut against the valve plate.
[0014] A flue system comprises: an indoor smoke exhaust channel and a public flue; according to the above-mentioned check valve, the check valve is connected between the indoor smoke exhaust channel and the public flue, the flue of the check valve is connected with the indoor smoke exhaust channel through the smoke inlet of the check valve and is connected with the public flue through the smoke outlet of the check valve.
[0015] Beneficial Effects
[0016] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects: the check valve of this embodiment can prevent gas backflow, rainwater, and debris and insects from entering the room through the smoke pipe. The airfoil-shaped surface on the valve plate can utilize the principle of aerodynamics to make the valve plate easier to flip, with a larger flipping range and a more stable flipping effect, so as to better release the space occupied by the valve plate in the flue, increase the exhaust area, reduce the smoke exhaust resistance, thereby increasing the exhaust volume and improving the smoke exhaust efficiency. At the same time, the check valve has a simple structure, can greatly reduce the production cost, and has very good economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 The present invention is a schematic structural diagram of a check valve according to an embodiment of the present invention.
[0018] Figure 2 The present invention is a schematic cross-sectional view of a check valve according to an embodiment of the present invention.
[0019] Figure 3 for Figure 2 A magnified schematic diagram of center A.
[0020] Figure 4 This is a schematic structural diagram of the valve plate proposed in an embodiment of the utility model.
[0021] Figure 5 The present invention is a partial structural schematic diagram of a check valve proposed in an embodiment of the present invention.
[0022] Figure 6 for Figure 5 A magnified schematic diagram of point B in the middle. DETAILED DESCRIPTION
[0023] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.
[0024] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings. The words "first", "second", etc. described in the present utility model are set for the convenience of describing the technical solution of the present utility model, and have no specific limiting effect. They are all general references and do not constitute a limiting effect on the technical solution of the present utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments in the present application can be combined with each other. In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model 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 utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Multiple technical solutions in the same embodiment, and multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not have contradictions or conflicts, all of which are within the scope of protection required by the present utility model.
[0025] Example 1
[0026] Combined with Figure 1-6 This embodiment provides a check valve, including a valve body 10 and a check structure; the valve body 10 has a flue 20, and the flue 20 has a smoke inlet 201 and a smoke outlet 202; the check structure is arranged on the valve body 10, so that the fluid flows in the flue 20 from the smoke inlet 201 to the smoke outlet 202 in one direction; the check structure includes a valve plate 11, and the valve plate 11 is located in the inner cavity of the flue 20 or at the smoke outlet 202 or at the smoke inlet 201;
[0027] The valve plate 11 is rotatably connected to a position adjacent to the upper part of the flue 20 to open or close the flue 20; a side surface of the valve plate 11 facing away from the flue gas inlet 201 is provided with an airfoil-like surface 111 and a main surface 112, and the airfoil-like surface 111 is closer to the rotation connection of the valve plate 11 than the main surface 112; when the valve plate 11 is rotated to open the flue 20, a first gap 12 and a second gap 13 can be formed between the valve plate 11 and the flue 20, and the second gap 13 is larger than the first gap 12, and the first gap 12 is a gap formed between a side surface of the valve plate 11 facing away from the flue gas inlet 201 and the upper part of the flue, and the second gap is a gap formed between a side surface of the valve plate 11 facing the flue gas inlet 201 and the upper part of the flue.
[0028] A check valve of this embodiment is installed on the smoke exhaust path. The airfoil-shaped surface 111 on the valve plate 11 can utilize the aerodynamic principle to make the valve plate 11 easier to flip, with a larger flipping range and a more stable flipping effect, so as to better release the space occupied by the valve plate 11 in the flue 20, increase the smoke exhaust area, reduce the smoke exhaust resistance, thereby increasing the exhaust volume and improving the smoke exhaust efficiency. At the same time, the check valve of this embodiment has a simple structure, which can greatly reduce the production cost and has very good economic efficiency.
[0029] The check valve of this embodiment is connected to the existing smoke pipe and other facilities in the use scenario through the flue 20, and the one-way flow of the fluid in the flue 20 from the smoke inlet 201 to the smoke outlet 202 is ensured by the check structure. When the airflow does not flow through the valve body 10, the valve plate 11 will sag due to its own gravity and close the flue 20. A through hole for fixing can be provided on the valve body 10 of the check valve to facilitate fixed connection with existing facilities. The check structure is mainly composed of a valve plate 11, which is rotatably connected to a position adjacent to the upper part of the flue 20. The valve plate 11 can be located in the inner cavity of the flue 20 or at the smoke outlet 202 or the smoke inlet 201. In a more preferred embodiment, the valve plate 11 is provided at the outlet of the flue 20.
[0030] For the valve plate 11 of this embodiment, the side surface facing away from the smoke inlet 201 is provided with an airfoil-shaped surface 111 and a main body surface 112. When the airflow enters the valve body 10, the airflow flows from the smoke inlet 201 to the smoke outlet 202. When flowing through the valve plate 11, it will push the valve plate 11 to rotate, so that the valve body 10 is turned on, thereby directing the airflow to the outside. Figure 3 and 4 In the above process, when the smoke passes through, the valve plate 11 rotates, and the smoke is separated by the valve plate 11. A part of the smoke flows through the first gap 12 and flows along the airfoil-shaped surface 111, and another part of the smoke flows through the second gap 13. Figure 3It can be seen that the first gap 12 is the gap formed between the side surface of the valve plate 11 facing away from the smoke inlet 201 and the upper part of the flue, and the second gap is the gap formed between the side surface of the valve plate 11 facing the smoke inlet 201 and the upper part of the flue.
[0031] Since the second gap 13 is larger than the first gap 12, the oil smoke mainly flows out through the second gap 13. Since the airfoil-like surface 111 has a convex curved surface similar to a wing, combined with the fluid characteristics, the flow rate of the flue gas fluid flowing through the airfoil-like surface 111 increases, resulting in a decrease in the pressure on this side of the valve plate 11, while the pressure on the other side of the valve plate 11 does not change significantly, resulting in the pressure on the side with the airfoil-like surface 111 being less than the pressure on the other side of the valve plate 11, that is, there is a pressure difference between the upper and lower surfaces of the valve plate 11 after the flip, and at this time the valve plate 11 as a whole will be subject to an upward lift, thereby further increasing the opening and closing angle of the valve plate 11, thereby reducing the smoke exhaust resistance, increasing the exhaust volume, and improving the smoke exhaust efficiency, and the flipped state of the valve plate 11 can be maintained more stably.
[0032] Obviously, since the imitation airfoil surface 111 is only added to one side of the valve plate 11, and the imitation airfoil surface 111 can be integrally formed with the valve plate 11 without redundant structure, the modification cost is relatively low and has good economy.
[0033] Combined with Figure 1 and 2 When the valve plate 11 is arranged at the smoke outlet 202, in order to limit the starting position and the turning stroke of the valve plate 11, in one embodiment, the smoke outlet 202 is arranged at an angle, and a limiting protrusion 19 is arranged at the lower part of the smoke outlet 202, and the limiting protrusion 19 can abut against the valve plate 11. When the valve plate 11 is at the initial position, the valve plate 11 naturally hangs down, and the limiting protrusion 19 abuts against the valve plate 11, so that the valve plate 11 can maintain an inclined state in accordance with the inclination of the smoke outlet 202, and the setting of the limiting protrusion 19 can also prevent the valve plate 11 from swinging in the opposite direction. It can be understood that if the valve plate 11 is arranged at the smoke inlet 201 or in the flue 20, a similar limiting protrusion 19 can also be arranged to achieve that the valve plate 11 maintains a certain inclination angle at the beginning and prevent the valve plate 11 from turning over.
[0034] Combined with Figure 1 , 2 and 4, the rotation centerline of the valve plate 11 is located within the projection area of the imitation airfoil surface 111 on the valve plate 11 in the direction of the valve plate 11, so as to ensure that after the airflow passes through the first gap 12, a part of the flue gas can flow along the imitation airfoil surface 111 to ensure the formation of a pressure difference.
[0035] Based on the above implementation, combined with the attached Figure 4, the cross-section of the airfoil-like surface 111 is arched. The distance from the arc top of the arch to its chord length is h, the chord length span of the arch is b, and the length of the valve plate 11 is L. Define the relative thickness D = h / b * 100%.
[0036] Through simulation and experiments, it can be known that if h is too high, the fluid characteristics of the airfoil-like surface 111 are poor. That is, when the flue gas flows through the highest point of the airfoil-like surface 111, a large number of vortices will form in the trailing edge of the airfoil-like surface 111, or in the area of the airfoil-like surface 111 facing the flue gas outlet 202 side, which will destroy the smoothness of the flue gas discharge in this area. Moreover, the vortices will further affect the smoke exhaust and further damage the fluid characteristics of the airfoil, resulting in a vicious cycle. Also, if h is too high, when the valve plate 11 is opened, the first gap 12 between the airfoil-like surface 111 and the upper edge of the flue 20 will be too small, which will also affect the smoke exhaust. Therefore, in a more preferred embodiment, it is set that 1 / 40L < h < 1 / 24L to ensure the use effect of the airfoil-like surface 111. Similarly, h will also affect the related relative thickness D. The relative thickness D can reflect the thickness of the airfoil-like surface 111. In actual use, different relative thicknesses D can be selected according to different working conditions for adaptation. The size of the relative thickness D will also affect the formation of vortices, thereby affecting the smoke exhaust effect. The relative thickness D can be taken as 5% ≤ D ≤ 18%, and preferably the relative thickness D is 10%.
[0037] Combined with the foregoing embodiments, it is known that the valve plate 11 is rotatably connected to the upper part of the flue 20, and the first gap 12 and the second gap 13 are formed between the valve plate 11 and the flue 20 after the valve plate 11 rotates. Therefore, the first gap 12 will also affect the airflow characteristics of the air passing through the airfoil-like surface 111. When the valve plate 11 is opened, the rotation center of the valve plate 11 is the fulcrum. On the side of the valve plate 11 with the airfoil-like surface 111, the area where the fulcrum extends towards the flue gas inlet 201 is defined as the front end of the airfoil-like surface 111, and the area where the fulcrum extends in the other direction is defined as the rear end of the airfoil-like surface 111. Both the front end and the rear end have weights.
[0038] When the relative relationship between the weights of the front end and the rear end remains the same, if b is too large at this time, it will cause the weight of the rear end to increase, thereby consuming the power of the flue gas discharge, affecting the opening and closing degree of the valve plate 11, and reducing the smoke exhaust efficiency. Through simulation and experiments, it can be known that when the chord length is in the range of 1 / 6L ≤ b ≤ 1 / 2L, the vorticity generated on the airfoil-like surface 111 is not much different, and the flow rate is not much different; while when b = 3 / 12L, b = 4 / 12L, and b = 5 / 12L, the vorticity generated on the airfoil-like surface 111 is the largest, and the flow rate is the largest.
[0039] Similarly, if the position of the rotation center is changed, that is, the position of the fulcrum is changed so that the rotation center is close to the front end, the mass of the rear end will also be too large, resulting in adverse effects similar to the above. If the rotation center is close to the front end, the size of the first gap 12 will be reduced. If the first gap 12 is too small, the smoke exhaust effect will also be lost. Therefore, in an optional embodiment, the distance from the rotation center of the valve plate 11 to the vertex of the side of the valve plate 11 away from the rotation center is defined as l, and l is set to satisfy 0.8L≤l≤0.9L. After testing, within the above range of l, compared with the existing check valve, the air volume of the check valve of this embodiment is larger.
[0040] Combined with Figure 1 and 3 In an optional embodiment, the valve plate 11 is provided with a through hole 14, through which a rotating shaft 15 is passed, so that the valve plate 11 is rotatably connected to the flue 20. Further, the flue 20 is provided with a fixing member 17 and a cover 16, and the fixing member 17 cooperates with the cover 16 to enable the two ends of the rotating shaft 15 to be assembled, thereby achieving the assembly between the rotating shaft 15, the flue 20 and the valve plate 11.
[0041] Example 2
[0042] Combined with Figure 1 Compared with the technical solution of Example 1, the check valve of this embodiment can be improved as follows: an oil baffle plate 18 is provided on the inner wall of the lower part of the flue 20, and the oil baffle plate 18 at least partially extends toward the direction close to the flue gas inlet 201.
[0043] Since the oil is heavy, it will gather at the lower part of the flue 20, preventing the oil from being blown directly outdoors under high air volume and high pressure, polluting the wall and destroying the living environment of residents. In this embodiment, the oil baffle 18 is arranged at the lower part of the flue 20 to block the oil accumulated in the flue 20.
[0044] Combined with Figure 2 In a further preferred embodiment, the oil baffle plate 18 includes an extension portion 182 and a connection portion 183, the connection portion 183 is connected to the inner wall of the lower part of the flue 20, the extension portion 182 extends toward the flue gas inlet 201, and a plurality of holes 181 are provided on the extension portion 182. In this embodiment, the connection portion 183 is used to connect the oil baffle plate 18 to the flue, and the combination of the extension portion 182 and the connection portion 183 forms a semi-enclosed structure, thereby achieving the interception of oil.
[0045] Furthermore, in order to prevent the oil baffle 18 from affecting the flow of gas in the channel, a plurality of holes 181 may be provided on the extension portion 182 to relieve pressure and ensure the flow of smoke. It is conceivable that the holes 181 may be in the shape of a strip, a circle or other geometric shapes.
[0046] Example 3
[0047] Combined with Figure 1-6 This embodiment proposes a flue system, including an indoor smoke exhaust channel and a public flue; the check valve in Embodiment 1 or 2 is connected between the indoor smoke exhaust channel and the public flue, and the flue 20 of the check valve is connected to the indoor smoke exhaust channel through the smoke inlet 201 of the check valve and is connected to the public flue through the smoke outlet 202 of the check valve.
[0048] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creative design without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.
Claims
1. A check valve, characterized in that: The invention comprises a valve body (10) and a non-return structure; the valve body (10) has a flue (20), and the flue (20) has a smoke inlet (201) and a smoke outlet (202); the non-return structure is arranged on the valve body (10) so as to allow a fluid to flow in one direction from the smoke inlet (201) to the smoke outlet (202) in the flue (20); The non-return structure comprises a valve plate (11), and the valve plate (11) is located in the inner cavity of the flue (20) or at the smoke outlet (202) or at the smoke inlet (201); The valve plate (11) is rotatably connected to a position adjacent to the upper part of the flue (20) to open or close the flue (20); a side surface of the valve plate (11) facing away from the flue gas inlet (201) is provided with an airfoil-like surface (111) and a main body surface (112); the airfoil-like surface (111) is closer to the rotatable connection of the valve plate (11) than the main body surface (112); when the valve plate (11) is rotated to open the flue (20), the valve plate (11) 11) can form a first gap (12) and a second gap (13) with the flue (20), the second gap (13) being larger than the first gap (12), the first gap (12) being a gap formed between a side surface of the valve plate (11) facing away from the flue (201) and an upper portion of the flue, and the second gap being a gap formed between a side surface of the valve plate (11) facing toward the flue (201) and an upper portion of the flue.
2. A check valve according to claim 1, characterized in that: The rotation center line of the valve plate (11) is located within the projection area of the imitation airfoil surface (111) on the valve plate (11) in the direction of the valve plate (11).
3. A check valve according to claim 2, characterized in that: The cross section of the airfoil-like surface (111) is arched, the chord span of the arch is b, the length of the valve plate (11) is L, and 3 / 12L≤b≤5 / 12L, 1 / 40L <h<1 / 24L。 4. A check valve according to claim 3, characterized in that: The distance from the rotation center of the valve plate (11) to the vertex of the valve plate (11) on the side away from the rotation center is l, satisfying 0.8L≤l≤0.9L.
5. A check valve according to claim 1, characterized in that: It also comprises a rotating shaft (15), the valve plate (11) is provided with a through hole (14), and the rotating shaft (15) passes through the through hole (14) so as to enable the valve plate (11) to be rotatably connected to the flue (20).
6. A check valve according to claim 5, characterized in that: It also includes a cover body (16), a fixing piece (17) is arranged on the flue (20), and both ends of the rotating shaft (15) are connected to the flue (20) through the assembly of the cover body (16) and the fixing piece (17).
7. A check valve according to claim 1, characterized in that: An oil baffle plate (18) is provided on the inner wall of the lower part of the flue (20), and at least a portion of the oil baffle plate (18) extends in a direction close to the flue gas inlet (201).
8. A check valve according to claim 7, characterized in that: The oil baffle plate (18) comprises an extension portion (182) and a connection portion (183); the connection portion (183) is connected to the inner wall of the lower portion of the flue (20); the extension portion (182) extends toward the flue gas inlet (201); and a plurality of holes (181) are provided on the extension portion (182).
9. A check valve according to claim 1, characterized in that: When the valve plate (11) is located at the smoke outlet (202), the smoke outlet (202) is arranged at an angle, and a limiting protrusion (19) is arranged at the lower part of the smoke outlet (202), and the limiting protrusion (19) can abut against the valve plate (11).
10. A flue system, characterized in that: include: Indoor smoke exhaust duct; Public chimneys; According to any one of claims 1 to 9, the check valve is connected between the indoor smoke exhaust channel and the common flue, and the flue (20) of the check valve is connected to the indoor smoke exhaust channel through the smoke inlet (201) of the check valve and is connected to the common flue through the smoke outlet (202) of the check valve.