A check valve structure and a range hood

Abstract

The present invention relates to the field of household appliance technology, and discloses a check valve structure and a range hood. The range hood comprises a fan and the check valve structure, and the check valve structure is installed at the outlet end of the fan. The check valve structure comprises a diffuser section whose flow area gradually increases along the exhaust direction of the wind, and any one of the diffuser sections can form a convex bulge on the inner wall of a separation low-speed zone, and the surface of the convex bulge is an arc surface and smoothly transitions to the inner wall. The check valve structure and the range hood of the present invention can compress the area of the separation low-speed zone and increase the effective flow area, thereby reducing the flow channel resistance, increasing the wind speed, and further improving the air performance of the fan; in addition, the reduction in the area of the separation low-speed zone and the reduction in secondary flow can also reduce the energy loss of the fan, reduce noise, and improve the user experience.

Description

Technical Field

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

[0002] A range hood is a household appliance that quickly removes stovetop waste and harmful cooking fumes, while also condensing and collecting them to reduce pollution and purify the air. A range hood typically includes a fan with a check valve at its outlet. The fan draws in fumes and discharges them through the check valve.

[0003] In the current standard, the air needs to maintain a certain static pressure when flowing through the check valve. According to Bernoulli's law, the decrease of fluid flow rate will be accompanied by the increase of fluid static pressure. According to the Venturi effect, when the restricted fluid passes through the reduced flow cross section, the flow velocity of the fluid increases, that is, the flow velocity is inversely proportional to the flow cross section. Therefore, if Figure 1 As shown, the flow channel of the check valve 1' has a diffuser section 11' with a gradually increasing flow area along the direction of wind flow. To achieve the connection between the check valve 1' and the fan outlet, some step structures are usually formed at the connection position. The setting of the step structure and the diffuser section 11' creates a large area of separation low-speed area 12' on the flow channel wall. Severe secondary flow (referring to the wind direction being in a vortex state and intersecting with the preset wind direction) occurs in the separation low-speed area 12', affecting the proportion of the effective flow area 13' (the wind direction in this area from the effective flow area 13' flows along the preset wind direction). On the one hand, the effective flow area of the flow channel is reduced and the flow channel resistance is increased, which reduces the air volume discharged per unit time and weakens the air performance of the fan. On the other hand, the secondary flow produces a strong impact, which not only increases the capacity loss, but also increases the noise at the diffuser end, affecting the customer experience.

[0004] Therefore, there is an urgent need for a check valve structure and a range hood to solve the above technical problems. Summary of the Invention

[0005] One object of the present invention is to provide a check valve structure that has low noise, can reduce the capacity loss of a fan, and improve the air performance of the fan.

[0006] Another object of the present invention is to provide a range hood that, by providing the above-mentioned check valve structure, has low noise, less damage to the fan capacity, and improved air performance.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A check valve structure is used to be installed at the outlet end of a fan. The check valve structure includes a diffuser section whose flow area gradually increases along the exhaust direction of the wind. A convex hull is provided on the inner wall of any one of the diffusers that can form a separation low-speed zone. The surface of the convex hull is an arc surface and smoothly transitions to the inner wall.

[0009] As an optional solution, the cross-section of the convex hull parallel to the wind discharge direction is a first arc shape, and the first arc has a first leading edge, a first highest point and a first trailing edge in sequence along the wind discharge direction, the first leading edge and the first trailing edge are respectively connected to the inner wall, and the first highest point protrudes from the inner wall; and / or

[0010] The cross section of the convex hull perpendicular to the wind discharge direction is a second arc shape, and the second arc shape has a second leading edge, a second highest point and a second trailing edge in sequence. The second leading edge and the second trailing edge are respectively connected to the inner wall, and the second highest point protrudes from the inner wall.

[0011] As an optional solution, the length of the check valve structure along the air discharge direction is L, the distance between the first leading edge and the first trailing edge is L1, and L / 4≤L1≤L / 2;

[0012] The distance from the first highest point to the inner wall is H1, and L1 / 5≤H1≤L1 / 4.

[0013] As an optional solution, the width of the diffuser section at a position corresponding to the second arc along a direction perpendicular to the wind discharge direction is B, the distance between the second leading edge and the second trailing edge is B1, and B / 3≤B1≤B / 2;

[0014] The distance from the second highest point to the inner wall is H2, and B1 / 6≤H2≤B1 / 5.

[0015] As an optional solution, the first arc shape is an airfoil shape, a circular arc, or an elliptical arc; and / or

[0016] The second arc shape is an airfoil shape, a circular arc, or an elliptical arc.

[0017] As an optional solution, the first arc shape is a laminar airfoil.

[0018] As an optional solution, the convex hull includes a plurality of spacers, which are arranged in parallel and at intervals, and the spacers extend along the exhaust direction of the wind.

[0019] As an optional solution, the convex bulge further includes a base, a plurality of the spacers are arranged on the base, and the base is connected to the inner wall.

[0020] As an optional solution, the thickness of the spacer is t1, 0.5mm≤t1≤1mm; and / or

[0021] The spacing between the spacers is g, 0.5mm≤g≤1mm;

[0022] The thickness of the base is t2, 1.5mm≤t2≤3mm.

[0023] A range hood comprises a fan and the check valve structure, wherein the check valve structure is installed at the outlet end of the fan.

[0024] The beneficial effects of the present invention are:

[0025] The check valve structure of the present invention has a convex hull disposed on the inner wall of the diffuser section where a separation low-speed zone is generated. On the one hand, the convex hull itself can occupy a certain area on the inner wall of the diffuser section, thereby compressing the area of the separation low-speed zone. Moreover, under the action of the Coanda effect, the air adheres to the curved surface of the convex hull and flows, which can greatly reduce the secondary flow generated by the airflow separation, thereby further compressing the area of the separation low-speed zone, thereby significantly increasing the effective flow area of the check valve and reducing the resistance of the flow channel. On the other hand, under the action of the Venturi effect, the total flow area of the diffuser section is reduced, thereby increasing the wind speed. The reduction in flow channel resistance and the increase in wind speed can both correspondingly improve the air performance of the fan. In addition, the reduction in the area of the separation low-speed zone and the reduction in secondary flow can also reduce the energy loss of the fan, reduce noise, and improve the user experience.

[0026] The range hood of the present invention is provided with the above-mentioned check valve structure, which reduces noise, reduces damage to the fan capacity, and improves air performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of a check valve structure provided by the prior art along a direction parallel to the exhaust direction of the wind;

[0028] Figure 2 1 is a schematic diagram of a partial structure of a range hood provided in the first embodiment of the present invention;

[0029] Figure 3 is a cross-sectional view of the check valve structure provided in the first embodiment of the present invention, taken along a direction parallel to the air discharge direction;

[0030] Figure 4 This is a cross-sectional view of a check valve structure provided by the prior art, perpendicular to the direction of air discharge;

[0031] Figure 5 is a cross-sectional view of the check valve structure provided in the first embodiment of the present invention, perpendicular to the direction of air discharge;

[0032] Figure 6This is a schematic diagram of the cross-sectional structure of the convex hull provided in the first embodiment of the present invention along the direction parallel to the wind discharge direction / perpendicular to the wind discharge direction Figure 1 ;

[0033] Figure 7 This is a schematic diagram of the cross-sectional structure of the convex hull provided in the first embodiment of the present invention along the direction parallel to the wind discharge direction / perpendicular to the wind discharge direction Figure 2 ;

[0034] Figure 8 This is a schematic diagram of the cross-sectional structure of the convex hull provided in the first embodiment of the present invention along the direction parallel to the wind discharge direction / perpendicular to the wind discharge direction Figure 3 ;

[0035] Figure 9 This is a partial schematic diagram of the check valve structure provided in the second embodiment of the present invention;

[0036] Figure 10 It is a side view of the convex hull provided in the second embodiment of the present invention.

[0037] In the picture:

[0038] 1′-check valve; 11′-diffuser section; 12′-separation low-speed zone; 13′-effective flow zone;

[0039] 1- fan;

[0040] 2-check valve structure; 21-diffuser section;

[0041] 3-convex hull; 31-first arc; 311-first leading edge; 312-first highest point; 313-first trailing edge; 32-second arc; 321-second leading edge; 322-second highest point; 323-second trailing edge; 33-spacer; 34-base; 4-chassis. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0043] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0044] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0045] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0046] Example 1

[0047] This embodiment provides a check valve structure 2 and a range hood, such as Figure 1 As shown, the range hood includes a chassis 4, a fan 1, and a check valve structure 2. The fan 1 is disposed inside the chassis 4, and the check valve structure 2 is disposed outside the chassis 4. The check valve structure 2 is located at the outlet of the fan 1 and is fixed to the chassis 4. It is understood that in other embodiments, the check valve structure 2 and the fan 1 may both be disposed inside the chassis 4, with the check valve structure 2 directly connected to the outlet of the fan 1. The specific connection method of the check valve structure 2 to the chassis 4 or the outlet of the fan 1 can refer to existing technologies and is not specifically limited here.

[0048] Preferably, if Figure 1 and Figure 2 As shown, the check valve structure 2 includes a diffuser section 21 with a gradually increasing flow area along the direction of air discharge. A convex bulge 3 is provided on any inner wall of the diffuser section 21 that can form a separation low-speed zone. The surface of the bulge 3 is an arcuate surface that smoothly transitions with the inner wall. Typically, the cross-sectional shape of the diffuser section 21 gradually transitions from square to circular. Any inner wall of the diffuser section 21 that has an outward expansion tendency may form a separation low-speed zone. The specific wall surface that will form the separation low-speed zone can be determined through actual measurement or simulation calculation. In this embodiment, the cross-sectional shape of the diffuser section is not specifically limited, as long as the bulge 3 is provided on any inner wall that can produce low-speed separation. It will be understood that in this embodiment, the air discharge method refers to the direction extending along the axis of the check valve.

[0049] In the check valve structure 2 of this embodiment, the convex bulge 3 is arranged on the inner wall of the diffuser section 21, which produces a separated low-speed zone. On the one hand, the convex bulge 3 itself can occupy a certain area on the inner wall of the diffuser section 21, thereby compressing the area of the separated low-speed zone. Under the action of the Coanda effect, the air adheres to the curved surface of the convex bulge 3 and flows, which can greatly reduce the secondary flow generated by airflow separation, thereby further compressing the area of the separated low-speed zone, thereby significantly increasing the effective flow area of the check valve and reducing the resistance of the flow channel. On the other hand, under the action of the Venturi effect, the total flow area of the diffuser section is reduced, thereby increasing the wind speed. The reduction in flow channel resistance and the increase in wind speed can both correspondingly improve the air performance of the fan 1. In addition, the reduction in the area of the separated low-speed zone and the reduction in secondary flow can also reduce the energy loss of the fan 1, reduce noise, and improve the user experience. The range hood of this embodiment, by providing the above-mentioned check valve structure, has low noise, reduces energy damage to the fan 1, and improves air performance.

[0050] Preferably, if Figure 2 As shown, the cross-section of the convex bulge 3 parallel to the wind discharge direction is a first arc 31. The first arc 31 has a first leading edge 311, a first highest point 312, and a first trailing edge 313 in sequence along the wind discharge direction. The first leading edge 311 and the first trailing edge 313 are respectively connected to the inner wall, and the first highest point 312 protrudes from the inner wall. The cross-section of the convex bulge 3 along the wind flow direction is configured as a smooth arc surface, which can reduce the impact and resistance of the airflow, effectively reduce the impact noise of the check valve structure, and increase the effective flow area within the check valve structure. Preferably, the first leading edge 311 of the convex bulge 3 is set at the starting point of the separation low-speed zone on the inner wall of the diffuser section 21 along the direction parallel to the wind discharge direction. The specific starting point of the separation low-speed zone can be determined based on actual testing or simulation calculations of the check valve structure 2 when the convex bulge is not provided.

[0051] Specifically, if Figure 3 As shown, the length of the check valve structure 2 along the air discharge direction is L, and the distance between the first leading edge 311 and the first trailing edge 313 is L1, where L / 4 ≤ L1 ≤ L / 2. Furthermore, the distance from the first highest point 312 to the inner wall is H1, where L1 / 5 ≤ H1 ≤ L1 / 4. Setting the dimensions of the first arc 31 within the above range can further reduce the area separating the low-speed zone. Of course, the above range represents only a preferred embodiment and does not limit the size of the convex hull 3.

[0052] like Figure 4 As shown, in the prior art, when the convex hull 3 is not provided, the direction of the secondary flow separating the low-speed zone is in a vortex state along the inner wall, that is, it is orthogonal to or at an angle to the preset wind discharge direction. Figure 5As shown, in this embodiment, the cross-section of the convex hull 3 perpendicular to the wind discharge direction is a second arc 32, and the second arc 32 has a second leading edge 321, a second highest point 322, and a second trailing edge 323 in sequence. The second leading edge 321 and the second trailing edge 323 are respectively connected to the inner wall, and the second highest point 322 protrudes from the inner wall. The convex hull 3 and the cross-section along the direction perpendicular to the wind flow are configured as smooth arc surfaces, which can reduce flow resistance, reduce the impact caused by secondary flow, further reduce impact noise, and improve user experience. Preferably, the second leading edge 321 of the convex hull 3 is set at the starting point of the separation low-speed zone along the direction perpendicular to the wind discharge. The specific starting point of the separation low-speed zone can be determined based on actual testing or simulation calculations of the check valve structure 2 when the convex hull 3 is not provided.

[0053] Specifically, if Figure 4 As shown, the width of the diffuser 21 at the corresponding position of the second arc 32, perpendicular to the wind discharge direction, is B. The distance between the second leading edge 321 and the second trailing edge 323 is B1, with B / 3 ≤ B1 ≤ B / 2. Furthermore, the distance from the second highest point 322 to the inner wall is H2, with B1 / 6 ≤ H2 ≤ B1 / 5. Setting the dimensions of the second arc 32 within the above range can further reduce the area of the separated low-speed zone. Of course, the above size range only represents a preferred solution and does not limit the size of the convex hull 3.

[0054] Alternatively, as Figure 6-Figure 8 As shown, the first arc 31 and the second arc 32 can each be an airfoil, a circular arc, or an elliptical arc. The smooth curve of the airfoil, circular arc, or elliptical arc can reduce the impact of the airflow and the resistance to the airflow, effectively reduce the impact noise of the check valve structure, and increase the effective flow area inside the check valve structure. In this embodiment, the first arc 31 and the second arc 32 are preferably airfoils. The streamlined structure of the airfoil has a better guiding effect than other structures, can better control the attachment of the airflow, and the wake area it produces is more uniform, which can better compress the airflow at the trailing edge of the convex hull 3.

[0055] Furthermore, the cross-section of the convex hull 3 along the direction of wind discharge (i.e., the first arc 31) is configured as a laminar airfoil. The laminar airfoil structure has a gentle curvature, without abrupt changes or lines with large curvature, and the first highest point 312 is located closer to the first trailing edge 313. The drag of the laminar airfoil is lower than that of other airfoils, making it less likely that air separation will produce secondary flow. This can further compress the area of the separated low-speed zone and increase the effective flow area within the check valve structure 2. Furthermore, the airflow impact is weak, thereby better reducing airflow impact noise.

[0056] Example 2

[0057] This embodiment provides a check valve structure 2 and a range hood, which are similar in general structure and working principle to the check valve structure 2 and range hood in the first embodiment, except for the detailed structure of the convex bump 3, as follows:

[0058] like Figure 9 and Figure 10 As shown, the convex bulge 3 includes multiple spacers 33, which are arranged in parallel and spaced apart, and extend along the direction of wind discharge. The convex bulge 3 composed of multiple spacers 33 can not only guide the wind, but also sort and rectify the wind with uneven pressure, reducing the uneven pressure of the wind, thereby reducing the pulsation and impact of the airflow within the check valve structure 2, and further reducing the noise caused by the bulge itself. It should be noted that in this embodiment, although the convex bulge 3 is composed of multiple parallel spacers 33, the overall profile and dimensional relationship of the convex bulge 3 composed of multiple spacers 33 are consistent with the convex bulge 3 in Example 1, and can also achieve the beneficial effects brought by the provision of the convex bulge 3 in Example 1.

[0059] Preferably, if Figure 10 As shown, the convex hump 3 also includes a base 34, on which multiple spacers 33 are mounted, and the base 34 is connected to the inner wall. During the production process, the spacers 33 can be secured to the base 34 first, or the spacers 33 and base 34 can be integrally manufactured and then secured to the inner wall of the check valve structure 2. This eliminates the need to install the spacers 33 piece by piece, making installation easier and more convenient. The base 34 can be connected to the inner wall of the diffuser 21 by welding, bonding, or other methods, which are not limited herein.

[0060] In this embodiment, Figure 10 As shown, the thickness of the spacer 33 is t1, 0.5mm≤t1≤1mm; the spacing between the spacers 33 is g, 0.5mm≤g≤1mm; and the thickness of the base 34 is t2, 1.5mm≤t2≤3mm. It should be understood that the above-mentioned size ranges represent only preferred embodiments and are not intended to limit the spacers 33 and base 34. Those skilled in the art may adjust the thickness t1, the spacing g between the spacers 33, and the thickness t2 of the base 34 as needed, and these are not intended to be limiting herein.

[0061] Obviously, the above embodiments of the present invention are merely examples for the purpose of illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will readily vary the specific embodiments and scope of application based on the principles of the present invention, and this specification should not be construed as limiting the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the claims.

Claims

1. A check valve structure for installation at the outlet end of a fan (1), characterized in that: The check valve structure comprises a diffuser section (21) whose flow area gradually increases along the exhaust direction of the wind, and a convex hull (3) is provided on the inner wall of any one of the diffuser sections (21) that can form a separation low-speed zone, and the surface of the convex hull (3) is a curved surface and smoothly transitions to the inner wall; The cross section of the convex hull (3) perpendicular to the wind discharge direction is a second arc (32), the second arc (32) sequentially having a second leading edge (321), a second highest point (322) and a second trailing edge (323), the second leading edge (321) and the second trailing edge (323) being connected to the inner wall respectively, the second highest point (322) protruding from the inner wall, the second leading edge (321) being arranged at the starting point of the separation low-speed zone perpendicular to the wind discharge direction, and the starting point of the separation low-speed zone being obtained by actual testing or simulation calculation based on a check valve structure without a convex hull; The convex hull (3) comprises a plurality of spacers (33), the plurality of spacers (33) are arranged in parallel and at intervals, and the spacers (33) extend along the exhaust direction of the wind.

2. The check valve structure according to claim 1, characterized in that: The cross section of the convex hull (3) parallel to the wind discharge direction is a first arc (31), and the first arc (31) has a first leading edge (311), a first highest point (312) and a first trailing edge (313) in sequence along the wind discharge direction, the first leading edge (311) and the first trailing edge (313) are respectively connected to the inner wall, and the first highest point (312) protrudes from the inner wall.

3. The check valve structure according to claim 2, wherein: The length of the check valve structure along the air discharge direction is L, the distance between the first leading edge (311) and the first trailing edge (313) is L1, and L / 4≤L1≤L / 2; The distance from the first highest point (312) to the inner wall is H1, and L1 / 5≤H1≤L1 / 4.

4. The check valve structure according to claim 2, wherein: The width of the diffuser section (21) and the second arc (32) at positions corresponding to the second arc (32) along a direction perpendicular to the wind discharge direction is B, the distance between the second leading edge (321) and the second trailing edge (323) is B1, and B / 3≤B1≤B / 2; The distance from the second highest point (322) to the inner wall is H2, and B1 / 6≤H2≤B1 / 5.

5. The check valve structure according to claim 2, wherein: The first arc (31) is an airfoil, a circular arc, or an elliptical arc; and / or The second arc (32) is an airfoil, a circular arc, or an elliptical arc.

6. The check valve structure according to claim 2, wherein: The first arc (31) is a laminar airfoil.

7. The check valve structure according to claim 1, wherein: The convex hull (3) further includes a base (34), a plurality of the spacers (33) are arranged on the base (34), and the base (34) is connected to the inner wall.

8. The check valve structure according to claim 7, wherein: The thickness of the spacer (33) is t1, 0.5 mm ≤ t1 ≤ 1 mm; and / or The spacing between the spacers (33) is g, 0.5 mm ≤ g ≤ 1 mm; The thickness of the base (34) is t2, 1.5 mm ≤ t2 ≤ 3 mm.

9. A range hood, characterized in that: It comprises a fan (1) and the check valve structure according to any one of claims 1 to 8, wherein the check valve structure is installed at the outlet end of the fan (1).

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