Centrifugal fan and range hood

Abstract

The utility model relates to a centrifugal fan and a range hood. Comprising a volute provided with a cavity and an exhaust outlet communicated with the cavity; the impeller is positioned in the cavity of the volute; the volute tongue is arranged on the inner wall of the volute on one side of the air outlet; the volute tongue is made of an elastic material; one end of the pushing piece abuts against the first surface, back on to the cavity, of the volute tongue, and the pushing piece is configured to adjust the shape of the volute tongue through movement of the pushing piece so as to change the gap between the volute tongue and the impeller and / or the distance between the volute tongue and the inner wall of the volute on the other side of the exhaust outlet; the power piece is located outside the volute and is configured to drive the pushing piece to move; the other end of the pushing piece penetrates through the cavity wall of the volute and is movably coupled with the power piece; one end of the connecting rod is connected with the power piece, and the other end is connected with the pushing piece to establish motion coupling of the power piece and the pushing piece. According to the technical scheme, the oil smoke suction effect can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of kitchen appliances, in particular to a centrifugal fan and a range hood. BACKGROUND

[0002] The range hood, also known as the extractor hood, is a kind of kitchen appliance for purifying the kitchen environment. The range hood is installed above the kitchen stove and can quickly extract the waste generated by the stove combustion and the oil fume generated during the cooking process, which is harmful to human body, and discharge it to the outdoor, while condensing and collecting the oil fume, reducing pollution, purifying air, and having the safety guarantee function of preventing explosion and poisoning.

[0003] The core function of the range hood is the oil fume extraction effect, but the kitchen environment in different user's homes and the public flue are different, which leads to that the range hood cannot achieve the preset efficiency in actual use, and the oil fume extraction effect is poor; or the noise is large, and there is the problem of energy waste. CONTENT OF THE INVENTION

[0004] Therefore, in order to solve at least one problem in the background art, the present application provides a centrifugal fan and a range hood.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0006] In a first aspect, the present application provides a centrifugal fan, comprising:

[0007] A volute shell having a cavity and an air outlet communicating with the cavity;

[0008] A impeller located in the cavity of the volute shell;

[0009] A volute tongue arranged on the inner wall of one side of the volute shell; the volute tongue is made of elastic material;

[0010] A pushing member abutting against the first surface of the volute tongue away from the cavity, configured to adjust the shape of the volute tongue by its own movement, so as to change the gap between the volute tongue and the impeller, and / or the distance between the volute tongue and the inner wall of the other side of the volute shell;

[0011] A power member located outside the volute shell, configured to drive the movement of the pushing member; the other end of the pushing member passes through the cavity wall of the volute shell and is movably coupled with the power member;

[0012] A connecting rod having one end connected to the power member and the other end hingedly connected to the pushing member, so as to establish the movement coupling between the power member and the pushing member.

[0013] In an optional embodiment in combination with the first aspect of the present application, the power member comprises a rotating shaft outputting torque, and one end of the connecting rod is connected to the rotating shaft; the connecting rod can swing following the rotation of the rotating shaft.

[0014] In conjunction with the first aspect of this application, in an optional embodiment, the connecting rod has an elongated hole, and the pusher is provided with a pin that can move within the elongated hole; the pin is rotatable relative to the pusher.

[0015] In conjunction with the first aspect of this application, in an optional embodiment, the pushing member includes two parallel and linked push rods and a crossbeam connecting the two push rods, with the two push rods correspondingly disposed at both ends of the first surface; the crossbeam connects to the connecting rod.

[0016] In conjunction with a first aspect of this application, in an alternative embodiment, the pusher further includes a base pad located between the first surface and the push rod; the shape of the base pad corresponds to the first surface.

[0017] In conjunction with the first aspect of this application, in an optional embodiment, a groove is provided on the side of the volute tongue near the pusher, and the bottom wall of the groove is the first surface.

[0018] In conjunction with the first aspect of this application, in an optional embodiment, the volute further includes a reinforcing plate affixed to the surface of the volute; the reinforcing plate has a first through hole through which the pusher passes.

[0019] In conjunction with the first aspect of this application, in an optional embodiment, the reinforcing plate further includes a bushing disposed correspondingly at the first through hole and used to guide the movement of the pusher.

[0020] In conjunction with the first aspect of this application, in an optional embodiment, the centrifugal fan further includes a limiting member disposed on the trajectory of the connecting rod swinging to limit the swing range of the connecting rod.

[0021] Secondly, embodiments of this application provide a range hood, including any of the centrifugal fans described above.

[0022] The centrifugal fan and range hood provided in this application include: a volute housing having a cavity and an exhaust port communicating with the cavity; an impeller located within the cavity of the volute housing; a volute tongue disposed on the inner wall of the volute housing on one side of the exhaust port; the volute tongue being made of an elastic material; a pushing member, one end of which abuts against a first surface of the volute tongue facing away from the cavity, configured to adjust the shape of the volute tongue through its own movement to change the gap between the volute tongue and the impeller, and / or the distance between the volute tongue and the inner wall of the volute housing on the other side of the exhaust port; a power member located outside the volute housing, configured to drive the movement of the pushing member; the other end of the pushing member passing through the cavity wall of the volute housing and being motion-coupled with the power member; and a connecting rod, one end of which is connected to the power member and the other end of which is connected to the pushing member, to establish motion coupling between the power member and the pushing member. It can be seen that the centrifugal fan and range hood of this application embodiment, by setting the volute tongue to be made of an elastic material and adjusting the shape of the volute tongue through the pushing member, improve the working efficiency of the centrifugal fan, thereby enhancing the smoke extraction effect. Furthermore, the linkage in this embodiment establishes motion coupling between the power component and the pushing component, featuring a simple structure and high transmission efficiency. Therefore, the centrifugal fan and range hood in this embodiment can improve the fume extraction effect, and have a simple structure and high transmission efficiency.

[0023] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1 A schematic diagram of a centrifugal fan provided in an embodiment of this application;

[0026] Figure 2 This is an exploded view (exploded view) of the centrifugal fan provided in the embodiments of this application;

[0027] Figure 3 A schematic diagram showing the volute tongue in an adjustable position in a centrifugal fan provided in an embodiment of this application;

[0028] Figure 4 A schematic diagram showing the volute tongue of a centrifugal fan in another adjustable position, provided in an embodiment of this application;

[0029] Figure 5 for Figure 4 A magnified view of a portion of point A in the middle;

[0030] Figure 6 A schematic diagram of the connecting rod and power component in a centrifugal fan provided in an embodiment of this application;

[0031] Figure 7 A schematic diagram showing the removal of the crossbeam from the pusher component in a centrifugal fan provided in an embodiment of this application;

[0032] Figure 8 A schematic diagram of the crossbeam in the centrifugal fan provided in the embodiments of this application;

[0033] Figure 9 This is a schematic diagram of the reinforcing plate in a centrifugal fan provided in an embodiment of this application.

[0034] Explanation of reference numerals in the attached figures:

[0035] 10. Volute; 11. Exhaust vent; 12. Reinforcing plate; 13. Bushing; 20. Impeller; 30. Volute tongue; 31. Groove; 32. First surface; 40. Pushing component; 41. Pin; 42. Push rod; 43. Crossbeam; 431. Pin connector; 44. Base pad; 50. Power component; 60. Connecting rod; 61. Long hole; 70. Power component bracket; 71. Support plate; 72. Limiting component. Detailed Implementation

[0036] To make the technical solution and beneficial effects of this application more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0037] In the description of this application, the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.

[0038] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly include at least one of those features.

[0039] In this application, unless otherwise expressly defined, the terms "installation," "connection," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In this application, unless otherwise expressly defined, "above," "over," and "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above" and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the horizontal height of the first feature is higher than the horizontal height of the second feature. "Below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0041] To fully understand this application, detailed steps and structures will be presented in the following description to illustrate the technical solution of this application. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other implementation methods.

[0042] The applicant of this application discovered during the research and development that, in order to improve the working efficiency of centrifugal fans, existing technologies also include centrifugal fans with variable volute shapes. However, the variable volute shape structure in existing technologies is very complex, which leads to unstable performance on the one hand, and increases manufacturing costs on the other.

[0043] Therefore, based on further research and development by the applicant, the following technical solution was proposed.

[0044] This application provides a centrifugal fan. (See reference...) Figure 1 and Figure 2 The centrifugal fan includes:

[0045] The volute 10 has a cavity and an exhaust port 11 communicating with the cavity;

[0046] Impeller 20 is located inside the cavity of the volute 10;

[0047] The volute tongue 30 is disposed on the inner wall of the volute 10 near the exhaust port 11; the volute tongue 30 is made of elastic material.

[0048] The pusher 40, with one end abutting against the first surface 32 of the volute tongue 30 facing away from the cavity, is configured to adjust the shape of the volute tongue 30 by its own movement to change the gap between the volute tongue 30 and the impeller 20, and / or the distance between the volute tongue 30 and the inner wall of the volute shell 10 on the other side of the exhaust port 11.

[0049] The power component 50 is located outside the volute 10 and is configured to drive the movement of the pusher 40; the other end of the pusher 40 passes through the cavity wall of the volute 10 and is motion-coupled with the power component 50.

[0050] Link 60 is connected at one end to the power component 50 and at the other end to the pusher component 40 to establish motion coupling between the power component 50 and the pusher component 40.

[0051] Understandably, for a centrifugal fan, the volute 10 can be a casing with axial air intake and radial air outlet. Specifically, the volute 10 can adopt a gradually expanding shape of a logarithmic spiral or an Archimedean spiral. This design causes the cross-sectional area of ​​the volute 10 to gradually increase along the airflow direction, thereby reducing the gas velocity, gradually converting kinetic energy into static pressure energy, and improving the efficiency of the fan. Further details are omitted here.

[0052] Understandably, the volute 10 at the exhaust port 11 includes two opposing inner walls, and the volute tongue 30 is disposed on one of these inner walls. Specifically, the inner wall on which the volute tongue 30 is disposed may be the inner wall closer to the impeller 20.

[0053] Specifically, the volute tongue 30 can be made of silicone rubber or heat-resistant resin material, preferably with high elasticity and wear resistance, capable of rapid deformation under the action of the pusher 40, and able to withstand repeated deformation without damage.

[0054] Understandably, since the space inside the volute 10 is limited, the power component 50 can be located outside the volute 10, and the pusher 40 can pass through the cavity wall of the volute 10 and be kinematically coupled with the power component 50.

[0055] Understandably, establishing motion coupling between the power component 50 and the pusher component 40 through the connecting rod 60 has the characteristics of simple structure and high transmission efficiency.

[0056] Understandably, adjusting the shape of the volute tongue 30 can change the gap between the volute tongue 30 and the impeller 20, and / or the distance between the volute tongue 30 and the inner wall of the volute casing 10 on the other side of the exhaust port 11. See details. Figure 3 and Figure 4 , Figure 3 In the process, the gap between the volute tongue 30 and the impeller 20 is t1, and the distance between the volute tongue 30 and the inner wall of the volute shell 10 on the other side of the exhaust port 11 is d1. Figure 4In the process, the gap between the volute tongue 30 and the impeller 20 is t2, and the distance between the volute tongue 30 and the inner wall of the volute shell 10 on the other side of the exhaust port 11 is d2, where t2≠t1 and d2≠d1.

[0057] In this embodiment of the centrifugal fan, the volute 30 is made of an elastic material, and the shape of the volute 30 is adjusted by the pusher 40 to improve the working efficiency of the centrifugal fan, thereby enhancing the fume extraction effect. Furthermore, in this embodiment, the connecting rod establishes motion coupling between the power component and the pusher, resulting in a simple structure and high transmission efficiency.

[0058] In some embodiments of this application, the power component 50 includes a rotating shaft that outputs torque, and one end of the connecting rod 60 is connected to the rotating shaft; the connecting rod 60 can swing in response to the rotation of the rotating shaft.

[0059] Understandably, rotary power components 50 generally offer higher efficiency, lower cost, and better control performance, such as rotary motors. Through hinge, the link 60 can convert oscillation into movement of the pusher 40.

[0060] Specifically, the power component 50 can be a stepper motor or a servo motor.

[0061] In some embodiments of this application, reference is made to Figure 5 and Figure 6 The connecting rod 60 has an elongated hole 61, and the pushing member 40 is provided with a pin 41 that can move within the elongated hole 61; the pin 41 can rotate relative to the pushing member 40.

[0062] The movement of the pusher 40 is smoother through the cooperation of the elongated hole 61 and the pin 41. Specifically, the elongated hole 61 can be an oblong hole. The pin 41 can be a cylindrical pin, and specifically, the clearance between the pin 41 and the elongated hole 61 is greater than 0.5 mm.

[0063] In some embodiments of this application, reference is made to Figure 2 , Figure 7 and Figure 8 The pusher 40 includes two parallel and linked push rods 42 and a crossbeam 43 connecting the two push rods 42. The two push rods 42 are respectively arranged at both ends of the first surface 32, and the crossbeam 43 is connected to the connecting rod 60.

[0064] In this way, both ends of the volute tongue 30 are subjected to force, and the deformed shape is more stable.

[0065] That is, one end of each of the two push rods 42 is connected to the volute tongue 30, and the other end is fixed to the crossbeam 43, establishing linkage between the two push rods 42. The crossbeam 43 connects to the connecting rod 60, which allows for more balanced force distribution compared to having only one push rod 42 connected to the connecting rod 60. Specifically, the crossbeam 43 connects to the connecting rod 60 at the midpoint of the line connecting the two push rods 42.

[0066] Specifically, a pin connector 431 is provided in the middle of the line connecting the two push rods 42 on the crossbeam 43, and the pin connector 431 has a connecting hole that mates with the pin 41.

[0067] In some embodiments of this application, reference is made to Figure 7 The pusher 40 further includes a base pad 44 located between the first surface 32 and the push rod 42; the shape of the base pad 44 corresponds to the first surface 32. This increases the contact area between the pusher 40 and the volute tongue 30, resulting in more uniform force distribution and greater shape stability for the volute tongue 30.

[0068] In some embodiments of this application, reference is made to Figure 2 The volute tongue 30 has a groove 31 on the side near the pusher, and the bottom wall of the groove 31 is the first surface 32.

[0069] Understandably, the volute tongue 30 with the groove 31 has a stronger deformation capability, such as a larger deformation range.

[0070] In some embodiments of this application, reference is made to Figure 9 The volute 10 also includes a reinforcing plate 12, which is attached to the cavity wall of the volute 10; the reinforcing plate 12 has a first through hole through which the pusher 40 passes.

[0071] This increases the strength of the cavity wall of the volute 10.

[0072] In some embodiments of this application, the reinforcing plate 12 further includes a bushing 13, which is disposed at the first through hole and is used to guide the movement of the pusher.

[0073] Specifically, the cavity wall has a second through hole for the bushing 13 to pass through.

[0074] Specifically, the bushing 13 is made of a material with a coefficient of friction lower than a preset value. More specifically, the preset value for the coefficient of friction can be 0.3. More specifically, the material of the bushing 13 can be nylon, etc.

[0075] In some embodiments of this application, reference is made to Figure 6The centrifugal fan also includes a limiting member 72, which is disposed on the swing trajectory of the connecting rod 60 to limit the swing range of the connecting rod 60.

[0076] Specifically, the limiting member 72 may be a rectangular block to block the link 60 from its swing trajectory.

[0077] Specifically, the centrifugal fan further includes a power component bracket 70 fixed to the outer wall of the volute. The power component bracket 70 includes a support plate 71, the rotation shaft of the power component 50 passes through the support plate 71 and connects to the connecting rod 60, the distance between the connecting rod 60 and the support plate 71 is less than a preset value, and the stop block is disposed on the support plate 71.

[0078] Specifically, the preset value can be 10mm.

[0079] This application also provides a range hood, which includes the centrifugal fan described above.

[0080] The range hood of this embodiment uses a volute 30 made of an elastic material, and adjusts the shape of the volute 30 by a pusher 40 to improve the working efficiency of the centrifugal fan, thereby enhancing the smoke extraction effect. Furthermore, the linkage in this embodiment establishes motion coupling between the power component and the pusher, resulting in a simple structure and high transmission efficiency.

[0081] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations of the technical solutions contained in this application. Various modifications and changes can be made to the above embodiments without departing from the scope of this application. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments merely illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. A centrifugal fan, characterized in that, include: The volute has a cavity and an exhaust port communicating with the cavity; The impeller is located inside the cavity of the volute. The volute tongue is located on the inner wall of one side of the volute shell; The volute tongue is made of an elastic material; The pusher, with one end abutting against the first surface of the volute tongue facing away from the cavity, is configured to adjust the shape of the volute tongue by its own movement to change the gap between the volute tongue and the impeller, and / or the distance between the volute tongue and the inner wall on the other side of the volute shell. A power component, located outside the volute, is configured to drive the movement of the pusher; the other end of the pusher passes through the cavity wall of the volute and is motion-coupled with the power component. A connecting rod is connected at one end to the power component and at the other end to the push component to establish kinematic coupling between the power component and the push component.

2. The centrifugal fan according to claim 1, characterized in that, The power component includes a rotating shaft that outputs torque, and one end of the connecting rod is connected to the rotating shaft; the connecting rod can swing in accordance with the rotation of the rotating shaft.

3. The centrifugal fan according to claim 2, characterized in that, The connecting rod has an elongated hole, and the pusher is provided with a pin that can move within the elongated hole; the pin can rotate relative to the pusher.

4. The centrifugal fan according to claim 1, characterized in that, The pushing component includes two parallel and linked push rods and a crossbeam connecting the two push rods. The two push rods are respectively arranged at both ends of the first surface; the crossbeam connects to the connecting rod.

5. The centrifugal fan according to claim 4, characterized in that, The pusher also includes a base pad located between the first surface and the push rod; the shape of the base pad corresponds to the first surface.

6. The centrifugal fan according to claim 1, characterized in that, The volute tongue has a groove on the side near the pusher, and the bottom wall of the groove is the first surface.

7. The centrifugal fan according to any one of claims 1-6, characterized in that, The volute also includes a reinforcing plate, which is attached to the surface of the volute; the reinforcing plate has a first through hole through which the pushing member passes.

8. The centrifugal fan according to claim 7, characterized in that, The reinforcing plate also includes a bushing, which is disposed at the first through hole and is used to guide the movement of the pusher.

9. The centrifugal fan according to claim 2, characterized in that, The centrifugal fan also includes a limiting component, which is disposed on the trajectory of the connecting rod swinging to limit the swing range of the connecting rod.

10. A range hood, characterized in that, Includes the centrifugal fan as described in any one of claims 1-9.

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