Check valve and range hood

Abstract

The utility model relates to the field of household appliances, and provides a check valve and a range hood, the check valve is used for the range hood and comprises a valve body and a rectification structure, a flue is arranged in the valve body, and a smoke inlet and a smoke outlet which are communicated with the flue are formed in the valve body; the rectifying structure is arranged in the flue and comprises a flow guide component and a supporting component, the flow guide component and the inner wall face of the flue are arranged in a spaced mode, and the flow guide component extends in the direction from the smoke inlet to the smoke outlet. The supporting component is connected between the outer wall face of the flow guide component and the inner wall of the flue and extends in the radial direction of the flue. The vortex area in the check valve area can be effectively reduced, the air performance of the range hood is remarkably improved, the flow resistance loss is reduced, and the noise level of the range hood is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a check valve and a range hood. Background Art

[0002] In the relevant technical field, when the smoke reaches the connection between the centrifugal fan and the check valve, the smoke will flow in a larger vortex state at this point due to the change in the flow area, which can easily cause the range hood to produce loud noise, or even cause adverse phenomena such as flutter. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model proposes a check valve, which can effectively reduce the vortex area in the check valve area by setting a rectifying structure, significantly improve the air performance of the range hood, reduce the flow resistance loss, and effectively reduce the noise level of the range hood.

[0004] The utility model also provides a range hood.

[0005] The check valve according to the first embodiment of the utility model is used for a range hood, comprising: a valve body, a flue is arranged in the valve body, and a smoke inlet and a smoke outlet connected to the flue are opened on the valve body;

[0006] A rectifying structure, wherein the rectifying structure is arranged in the flue, and the rectifying structure comprises a flow guiding member and a supporting member, wherein the flow guiding member is spaced apart from the inner wall surface of the flue, and the flow guiding member extends in a direction from the smoke inlet toward the smoke outlet, and the supporting member is connected between the outer wall surface of the flow guiding member and the inner wall of the flue, and the supporting member extends radially along the flue.

[0007] According to an embodiment of the utility model, the cross-section of the flow-guiding member along the axial direction of the flue includes at least one of a circle, a semicircle, an irregular circle or an irregular semicircle.

[0008] According to an embodiment of the utility model, the flow-guiding member has a first end corresponding to the smoke inlet and a second end corresponding to the smoke outlet, and the flow-guiding member is arranged in a gradually contracting direction from the first end toward the second end;

[0009] Alternatively, the flow guiding member is arranged to expand gradually from the first end toward the second end.

[0010] According to an embodiment of the present invention, the inclination angle of the wall surface of the flow-guiding member from the first end to the second end relative to the axial direction of the flue is α, and α is less than or equal to 45°.

[0011] According to an embodiment of the utility model, the inner wall surface includes a pressure diffuser surface, the pressure diffuser surface gradually inclines from the smoke inlet toward the smoke outlet toward the outer side of the valve body, and the rectification structure is arranged corresponding to the pressure diffuser surface.

[0012] According to an embodiment of the utility model, the cross-section of the flow guide component is semicircular or irregularly semicircular, and the flow guide component is arranged toward one side of the diffuser surface.

[0013] According to an embodiment of the present utility model, the support member includes a plurality of support plates, and the plurality of support plates are arranged in an annular array between the outer wall surface of the flow guide member and the inner wall of the flue.

[0014] According to an embodiment of the present utility model, the guide member includes a plurality of guide plates, and the plurality of guide plates are arranged in a radial direction of the flue and spaced apart from each other.

[0015] According to an embodiment of the present utility model, two ends of the supporting member and the flow guiding member along the axial direction of the flue are flush with each other.

[0016] The range hood according to the second embodiment of the utility model comprises:

[0017] A fan, wherein the fan has a volute, a mounting cavity for accommodating a wind wheel is defined in the volute, and an air inlet and an air outlet communicating with the mounting cavity are formed on the volute;

[0018] As for the check valve as described above, the smoke inlet of the check valve is communicated with the air outlet.

[0019] The above one or more technical solutions in the embodiment of the utility model have at least one of the following technical effects: the present application sets a rectifying structure in the flue of the valve body, wherein the guide member and the support member of the rectifying structure work together to ensure the smooth flow of the airflow in the flue. The interval between the guide member and the inner wall of the flue can avoid the airflow from directly impacting the flue wall when passing through, reducing the formation of vortex. At the same time, the guide member extends from the smoke inlet toward the smoke outlet, which can guide the airflow to pass through the check valve smoothly, further reducing the vortex area; the support member is connected between the guide member and the inner wall of the flue, plays the role of supporting and fixing the guide member, and increases the structural stability of the flue by extending radially along the flue, so that the airflow is more stable when passing through, reducing the disturbance of the airflow and the formation of vortex. In this way, by setting a rectifying structure in the flue of the valve body, the vortex and resistance loss can be effectively reduced, and the exhaust efficiency of the range hood can be improved. At the same time, due to the reduction of vortex, the noise generated by the airflow when passing through the check valve will also be reduced accordingly, thereby improving the use environment of the kitchen.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the assembly relationship of an embodiment of a range hood provided by the utility model;

[0023] Figure 2 yes Figure 1 A schematic structural diagram of a first embodiment of a check valve;

[0024] Figure 3 yes Figure 2 Cross-section of a check valve;

[0025] Figure 4 yes Figure 2 A cross-sectional view of another embodiment of a check valve;

[0026] Figure 5 yes Figure 1 A schematic structural diagram of a second embodiment of a check valve;

[0027] Figure 6 yes Figure 5 Cross-section of a check valve;

[0028] Figure 7 yes Figure 1 A schematic structural diagram of a third embodiment of a check valve;

[0029] Figure 8 yes Figure 7 Cross-section of a check valve;

[0030] Fig. 9 yes Figure 1 A schematic structural diagram of a fourth embodiment of a check valve;

[0031] Fig.10 yes Fig. 9 Cross-section of a check valve;

[0032] Fig.11 yes Figure 1 A schematic structural diagram of a fifth embodiment of a check valve.

[0033] Reference numerals:

[0034] 10. Range hood;

[0035] 100. Check valve;

[0036] 110, valve body; 111, flue; 111a, inner wall surface; 111b, pressure diffusion surface; 112, smoke inlet; 113, smoke outlet;

[0037] 120, rectification structure; 121, flow guide member; 121a, first end; 121b, second end; 122, support member;

[0038] 200, fan;

[0039] 210. Volute; 211. Installation cavity; 212. Air inlet; 213. Air outlet. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0042] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0044] As national standards for the control of range hood operating noise are further tightened, the market has proposed improvements to the operating noise of range hoods to reduce the sound power value and improve the sound quality. However, the current design of range hood check valves mostly only considers the prevention of smoke backflow and the degree of sealing during the extraction process, and has not paid attention to additional functions such as product noise reduction and sound quality improvement.

[0045] In the relevant technical field, the air flow velocity in the smoke outlet area of ​​the range hood, especially at the position of the check valve, is extremely high, generally above 20m / s. The high-speed airflow leads to an increase in aerodynamic noise. At the same time, due to the flow characteristics of the multi-blade centrifugal fan, the flow field in the check valve area often forms huge vortices, which worsens the noise level.

[0046] The utility model provides a check valve and a range hood.

[0047] In the utility model embodiment, refer to Figures 1 to 4 The check valve 100 is used for a range hood 10, and includes a valve body 110 and a rectifying structure 120. A flue 111 is arranged in the valve body 110, and a smoke inlet 112 and a smoke outlet 113 connected to the flue 111 are opened on the valve body 110; the rectifying structure 120 is arranged in the flue 111, and the rectifying structure 120 includes a flow guiding member 121 and a supporting member 122. The flow guiding member 121 is spaced apart from an inner wall surface 111a of the flue 111, and the flow guiding member 121 extends along the direction of the smoke inlet 112 toward the smoke outlet 113, and the supporting member 122 is connected between the outer wall surface of the flow guiding member 121 and the inner wall of the flue 111, and the supporting member 122 extends along the radial direction of the flue 111.

[0048] The valve body 110 is the main part of the check valve 100, and the valve body 110 is used to accommodate and support the internal structure of the entire device. One or more flues 111 are arranged inside the valve body 110, and the function of the flue 111 is to provide a directional flow channel for the oil smoke, ensuring that the oil smoke can flow along the designed path, thereby achieving the purpose of preventing the oil smoke from flowing back and smoothly discharging.

[0049] The smoke inlet 112 is the entrance for the oil smoke to enter the check valve 100. The design of the smoke inlet 112 should take into account factors such as the flow rate, flow velocity and flow direction of the oil smoke to ensure that the oil smoke can enter the flue 111 evenly and smoothly. Usually, the smoke inlet 112 will be equipped with a certain filtering device to initially filter large particles in the oil smoke to prevent them from entering the flue 111 and causing blockage.

[0050] The smoke outlet 113 is the outlet for the oil smoke to leave the check valve 100 and enter the smoke exhaust pipe. The design of the smoke outlet 113 should take into account the interface matching and sealing of the smoke exhaust pipe to ensure that the oil smoke can be completely and smoothly discharged to the outside. At the same time, the smoke outlet 113 also needs to have the function of preventing the outdoor wind from flowing back to ensure that when the outdoor wind is strong, the oil smoke will not flow back into the room through the smoke outlet 113.

[0051] The rectifying structure 120 is a key part of the check valve 100 . The rectifying structure 120 is used to optimize the flow state of the oil smoke, reduce eddy current and resistance, and improve the exhaust efficiency. The rectifying structure 120 is generally composed of a flow guide member 121 and a support member 122 .

[0052] The main function of the flow guide member 121 is to guide the oil smoke to flow along a predetermined path. Through its specific shape and position design, the oil smoke can form a laminar flow or turbulent flow state in the flue 111, avoiding direct impact on the wall of the flue 111 to generate eddy currents. This can not only reduce the flow resistance of the oil smoke, but also increase the discharge speed of the oil smoke.

[0053] The eddy current consumes the kinetic energy of the oil smoke and reduces the exhaust efficiency. By reducing the formation of the eddy current, the flow guide member 121 can reduce the energy loss of the oil smoke during the flow process and improve the exhaust efficiency.

[0054] The function of the supporting member 122 is to support and fix the flow guiding member 121. Since the flow guiding member 121 needs to withstand the impact and vibration of the oil smoke, it must be sufficiently supported and fixed to ensure its stability and reliability.

[0055] The support member 122 can also enhance the stability of the entire rectification structure 120. By connecting the flow guide member 121 and the inner wall of the flue 111, the support member 122 can form a stable overall structure to resist the impact and vibration of the oil smoke, ensuring that the rectification structure 120 will not be deformed or damaged during long-term use.

[0056] The present application sets a rectifying structure 120 in the flue 111 of the valve body 110, wherein the flow-guiding member 121 and the supporting member 122 of the rectifying structure 120 work together to ensure the smooth flow of the airflow in the flue 111. The interval between the flow-guiding member 121 and the inner wall surface 111a of the flue 111 allows the airflow to avoid directly impacting the wall surface of the flue 111 when passing through, thereby reducing the formation of vortices. At the same time, the flow-guiding member 121 extends from the smoke inlet 112 toward the smoke outlet 113, which can guide the airflow to pass smoothly through the check valve 100, further reducing the vortex area; the supporting member 122 is connected between the flow-guiding member 121 and the inner wall of the flue 111, plays the role of supporting and fixing the flow-guiding member 121, and by extending radially along the flue 111, increases the structural stability of the flue 111, makes the airflow more stable when passing through, and reduces the disturbance of the airflow and the formation of vortices. Thus, by providing the rectifying structure 120 in the flue 111 of the valve body 110, the vortex and resistance loss can be effectively reduced, thereby improving the smoke exhaust efficiency of the range hood 10. At the same time, due to the reduction of the vortex, the noise generated when the airflow passes through the check valve 100 will also be reduced accordingly, thereby improving the use environment of the kitchen.

[0057] Reference Figures 2 to 10 According to one embodiment of the present invention, the cross-section of the flow guide member 121 along the axial direction of the flue 111 includes at least one of a circle, a semicircle, an irregular circle or an irregular semicircle.

[0058] It is understandable that the cross section of the flow guide member 121 may have a specific shape in the axial direction of the flue 111. For example, its cross section may be circular, semicircular, irregular circular (referring to non-standard or deformed circular) and irregular semicircular (referring to non-standard or deformed semicircular).

[0059] The circular shape means that the cross section of the airflow guide member 121 along the axis direction of the flue 111 is a cross section similar to a circle. The circular shape generally has uniform fluid dynamics characteristics and can provide a relatively stable flow in the flue 111.

[0060] Semicircular means that the cross section of the flow guiding member 121 along the axial direction of the flue 111 is a semicircular shape, and of course it can also be an arc shape. The semicircular shape can refine the back pressure area generated by the vortex in the flue 111, practice fine control, and reduce the overall mass of the rectifying member.

[0061] An irregular circle refers to a shape that is close to a circle but does not completely follow the geometric definition of a standard circle. That is, a non-standard or deformed circle. It has different diameters or curvatures to adapt to specific fluid dynamics requirements or space limitations. That is, a specific shape may be set to intervene in the vortex generation area in the flue 111, thereby achieving the purpose of reducing the generation of vortices.

[0062] An irregular semicircle refers to a shape that is roughly semicircular, but does not completely conform to the standard semicircle geometric definition, that is, a non-standard or semicircular deformation. Corresponding to the semicircle, the semi-noncircle can also refine the back pressure area generated by the vortex in the flue 111, practice fine control, and reduce the overall mass of the rectifying component.

[0063] In practical applications, the choice of shape will depend on the specific requirements of the flue 111, such as flow, pressure, temperature, corrosiveness, and other factors that may affect the flow of fluid. By selecting a suitable shape of the flow guide member 121, the flow of fluid in the flue 111 can be effectively managed and controlled, thereby improving the stability of the airflow in the flue 111, reducing the generation of vortices, thereby reducing the vortex area, and reducing the noise caused by the vortex.

[0064] Reference Figure 3 According to an embodiment of the present invention, the flow guiding member 121 has a first end 121a corresponding to the smoke inlet 112 and a second end 121b corresponding to the smoke outlet 113, and the flow guiding member 121 is gradually arranged from the first end 121a toward the second end 121b;

[0065] Alternatively, the flow guiding member 121 is arranged to expand gradually from the first end 121a toward the second end 121b.

[0066] It can be understood that the air guiding member 121 gradually shrinks from the first end 121a corresponding to the smoke inlet 112 toward the second end 121b corresponding to the smoke outlet 113 to form a tapered shape.

[0067] Since the cross-sectional area of ​​the flow guide member 121 gradually decreases, according to the Bernoulli principle, the flow velocity of the oil smoke will increase when passing through the tapered portion, thereby accelerating the discharge of the oil smoke. The tapered shape helps to guide the oil smoke to the central area of ​​the flue 111, reduce the direct contact between the oil smoke and the wall of the flue 111, and reduce the possibility of vortex formation. By accelerating the flow of oil smoke and reducing vortex, the tapered setting can improve the exhaust efficiency and ensure that the oil smoke is quickly and smoothly discharged to the outside.

[0068] Of course, in another embodiment, the flow guide member 121 gradually expands from the first end 121a corresponding to the smoke inlet 112 toward the second end 121b corresponding to the smoke outlet 113, forming a gradually expanding shape. The gradually expanding shape gradually slows down the flow rate of the oil smoke when passing through, which helps to reduce the impact and wear of the oil smoke on the wall of the flue 111. In the gradually expanding part, the pressure of the oil smoke will gradually disperse, reducing the accumulation and blockage risk of the oil smoke in the flue 111. By slowing down the flow rate of the oil smoke and dispersing the pressure, the gradually expanding setting helps to reduce the noise generated by the oil smoke during the flow process.

[0069] Specifically, a suitable shape of the flow guide member 121 can be selected according to the specific specifications and usage scenarios of the range hood 10. If the oil smoke flow is large and the flow velocity is fast, a gradually contracting setting may be more appropriate; otherwise, a gradually expanding setting may be selected. In practical applications, the effects of flow guide members 121 of different shapes and layouts on the oil smoke flow and exhaust efficiency can be evaluated through fluid dynamics simulation or experimental verification, so as to select the optimal design solution.

[0070] Reference Figure 3 and Figure 8 According to an embodiment of the present invention, the inclination angle of the wall surface of the flow-guiding member 121 from the first end 121a to the second end 121b relative to the axial direction of the flue 111 is α, and α is less than or equal to 45°.

[0071] It is understandable that the main function of the flow guide member 121 is to guide and change the flow direction or speed of the smoke in the smoke duct 111. By adjusting the inclination angle of its wall surface, the flow characteristics of the smoke can be effectively controlled, such as reducing vortex, improving the uniformity of smoke flow, or increasing the speed of smoke flow.

[0072] When the angle α is small, for example, close to 0°, the wall surface of the flow guide member 121 is almost parallel to the axis of the flue 111. This design may be more suitable for applications where the flue gas flow direction needs to be kept unchanged or only slightly adjusted.

[0073] When the angle α gradually increases but does not exceed 45°, the wall surface of the flow-guiding member 121 begins to change the flow direction of the smoke more significantly. This design may be more suitable for applications that require a significant change in the flow direction of the smoke or an increase in the flow velocity of the smoke.

[0074] The selection of an α angle less than or equal to 45° may be based on engineering practice, fluid dynamics simulation or experimental results. This angle range may provide sufficient flexibility to adapt to different smoke flow requirements while avoiding unnecessary energy loss or flow instability that may be caused by excessive angles.

[0075] Optionally, the inclination angle α of the wall surface of the guide member 121 from the first end 121a to the second end 121b relative to the axial direction of the flue 111 can be 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40° or 45°, etc.

[0076] Reference Figure 2 and Fig.10 According to an embodiment of the present invention, the inner wall surface 111a includes a diffuser surface 111b, which gradually inclines from the smoke inlet 112 toward the smoke outlet 113 toward the outside of the valve body 110, and the rectifying structure 120 is arranged corresponding to the diffuser surface 111b.

[0077] It can be understood that the diffusion surface 111b refers to the portion of the inner wall surface 111a gradually inclined toward the outside of the valve body 110 from the smoke inlet 112 toward the smoke outlet 113, which is used to increase the static pressure of the fluid when passing through.

[0078] Since the diffuser surface 111b gradually tilts outward, the speed of the oil smoke will gradually decrease when it passes through, and the static pressure will increase accordingly. This helps to form a certain pressure gradient in the flue 111, and promotes the oil smoke to flow more smoothly to the smoke outlet 113. The design of the diffuser surface 111b can guide the oil smoke to flow along a specific path, reduce the direct contact between the oil smoke and the wall of the flue 111, and thus reduce the formation of vortex. The rectifier structure 120 matches the diffuser surface 111b to ensure that the oil smoke can pass smoothly and be optimally controlled.

[0079] Reference Figure 5 , Figure 6 , Fig. 9 and Fig.10 According to an embodiment of the present invention, the cross section of the flow guiding member 121 is semicircular or irregularly semicircular, and the flow guiding member 121 is disposed toward one side of the diffuser surface 111b.

[0080] It is understandable that the cross section of the flow-guiding member 121 is semicircular or irregularly semicircular, and the setting in the flue 111 is biased, and in this embodiment, the flow-guiding member 121 is set to one side of the pressure diffuser 111b, which can ensure that the flue gas is better guided and rectified when passing through the pressure diffuser 111b. The pressure diffuser 111b can be more effectively used to increase the static pressure of the flue gas and reduce the flow velocity, and reduce unnecessary energy loss.

[0081] Figures 2 to 11 According to an embodiment of the present invention, the support member 122 includes a plurality of support plates, and the plurality of support plates are arranged in an annular array between the outer wall surface of the flow guide member 121 and the inner wall of the flue 111 .

[0082] It is understandable that the arrangement of multiple support plates in an annular array can ensure that the guide member 121 is in a stable position in the flue 111, thereby preventing it from shifting or vibrating during the flow of smoke. The guide member 121 can also be effectively fixed in the center of the flue 111, thereby ensuring that smoke can pass through the guide member 121 evenly. The support plate is located between the outer wall surface of the guide member 121 and the inner wall of the flue 111, so that the support plate will not directly hinder the flow of smoke, but can provide the necessary support and fixing effect. Energy loss can be minimized while ensuring the smoothness of smoke flow.

[0083] In this embodiment, the stability of the flow guide member 121 in the flue 111 is significantly improved through the annular array of multiple support plates. This helps to reduce the risk of performance degradation or damage caused by vibration or displacement. The design of the support plates does not directly hinder the flow of smoke, thereby ensuring that the smoke can efficiently pass through the flow guide member 121 and the flue 111. At the same time, due to the reasonable layout of the support plates, they can also guide the flow direction of the smoke to a certain extent, making it more uniform and stable.

[0084] Figures 2 to 11 According to an embodiment of the present invention, the guide member 121 includes a plurality of guide plates, and the plurality of guide plates are arranged in a radial direction of the flue 111 and spaced apart from each other.

[0085] It is understandable that the plurality of guide plates are arranged at intervals along the radial direction of the flue 111, that is, the plurality of guide plates are radially distributed from the center to the periphery of the flue 111. This ensures that the smoke is uniformly guided from all directions when passing through the flue 111, thereby enhancing the uniformity and stability of the flow. In addition, a certain interval is maintained between the guide plates, so that they can avoid mutual interference or obstruction of the flow of smoke. At the same time, appropriate intervals can also help reduce energy loss and improve smoke exhaust efficiency.

[0086] By arranging the guide plates radially, this embodiment can more effectively guide the flow of smoke in the flue 111, reduce the formation of vortices and turbulence, and make the smoke flow more uniform and stable. By optimizing the flow state of smoke and reducing unnecessary energy loss, this design can improve the overall efficiency of the smoke exhaust system. This means that the range hood 10 can more effectively exhaust the smoke outdoors and reduce the retention time of the smoke indoors. At the same time, reducing the formation of vortices and turbulence also helps to reduce the noise generated when the smoke exhaust system is running, providing a quieter use environment.

[0087] Reference Figures 7 to 10 According to an embodiment of the present invention, the two ends of the support member 122 and the guide member 121 along the axial direction of the flue 111 are flush with each other.

[0088] It is understandable that, since both ends of the support member 122 and the guide member 121 are flush with the adjacent structures, smoke will not encounter additional resistance due to the irregular structure when passing through the smoke duct 111, which helps to maintain the smooth flow of smoke and improve the smoke exhaust efficiency.

[0089] Reference Figure 1The utility model further provides a range hood 10, which includes a fan 200 and the above-mentioned check valve 100. The fan 200 has a volute 210, and the volute 210 defines a mounting cavity 211 for accommodating a wind wheel. The volute 210 is formed with an air inlet 212 and an air outlet 213 connected to the mounting cavity 211; the smoke inlet 112 of the check valve 100 is connected to the air outlet 213. The specific structure of the check valve 100 refers to the above-mentioned embodiment; it can be understood that, since the above-mentioned check valve 100 is used in the range hood 10, the embodiment of the range hood 10 includes all technical solutions of all embodiments of the above-mentioned check valve 100, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0090] Finally, it should be noted that the above implementation modes are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention is described in detail with reference to the embodiments, a person skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A check valve for a range hood, characterized in that: include: A valve body, wherein a flue is arranged in the valve body, and a smoke inlet and a smoke outlet communicated with the flue are formed on the valve body; A rectifying structure, wherein the rectifying structure is arranged in the flue, and the rectifying structure comprises a flow guiding member and a supporting member, wherein the flow guiding member is spaced apart from the inner wall surface of the flue, and the flow guiding member extends in a direction from the smoke inlet toward the smoke outlet, and the supporting member is connected between the outer wall surface of the flow guiding member and the inner wall of the flue, and the supporting member extends radially along the flue.

2. The check valve according to claim 1, characterized in that: The cross section of the flow-guiding member along the flue axis direction includes at least one of a circle, a semicircle, an irregular circle or an irregular semicircle.

3. The check valve according to claim 1, characterized in that: The flow-guiding member has a first end corresponding to the smoke inlet and a second end corresponding to the smoke outlet, and the flow-guiding member is arranged in a gradually contracting direction from the first end toward the second end; Alternatively, the flow guiding member is arranged to expand gradually from the first end toward the second end.

4. The check valve according to claim 3, characterized in that: The inclination angle of the wall surface of the flow-guiding member from the first end to the second end relative to the axial direction of the flue is α, and α is less than or equal to 45°.

5. The check valve according to claim 1, characterized in that: The inner wall surface comprises a pressure diffuser surface, and the pressure diffuser surface gradually inclines from the smoke inlet toward the smoke outlet toward the outer side of the valve body, and the rectification structure is arranged corresponding to the pressure diffuser surface.

6. The check valve according to claim 5, characterized in that: The cross section of the flow guiding component is semicircular or irregularly semicircular, and the flow guiding component is arranged toward one side of the diffuser surface.

7. The check valve according to any one of claims 1 to 6, characterized in that: The support member comprises a plurality of support plates, and the plurality of support plates are arranged in an annular array between the outer wall surface of the flow guide member and the inner wall of the flue.

8. The check valve according to any one of claims 1 to 6, characterized in that: The flow guide component includes a plurality of flow guide plates, and the plurality of flow guide plates are arranged in an interval manner along the radial direction of the flue.

9. The check valve according to any one of claims 1 to 6, characterized in that: The two ends of the supporting member and the flow guiding member along the axial direction of the flue are flush with each other.

10. A range hood, characterized in that: include: A fan, wherein the fan has a volute, a mounting cavity for accommodating a wind wheel is defined in the volute, and an air inlet and an air outlet connected to the mounting cavity are formed on the volute; The check valve according to any one of claims 1 to 9, wherein the smoke inlet of the check valve is connected to the air outlet.

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