A fan assembly and an electric appliance

Abstract

The application relates to a fan assembly and an electric appliance, and relates to the technical field of fans. The fan assembly comprises a volute and a fan blade. The volute comprises a volute body and a volute tongue. The fan blade is installed in the volute body. The volute body is provided with an adjusting device for adjusting the gap between the volute tongue and the fan blade. The adjusting device improves the fan efficiency or reduces the noise by adjusting the volute tongue gap. The efficiency and noise between the volute and other components of the fan can be determined, so that different use requirements can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fan technology, in particular to a fan assembly and an electric appliance comprising the same. BACKGROUND

[0002] In the prior art, when designing the volute of a fan, the volute tongue gap and the volute tongue type are determined according to the design requirements and the parameters of the fan blade, at this time the efficiency and noise of the fan assembly are also determined. The volute designed based on this design method has a non-adjustable volute tongue gap and is only suitable for specific use requirements.

[0003] In view of the above problems, there is an urgent need for a fan assembly capable of flexibly adjusting the volute tongue gap according to different requirements. SUMMARY

[0004] The present application provides a fan assembly and a household appliance comprising the same, which is used for adjusting the depth of the volute tongue during the operation of the fan, and can achieve the effects of reducing noise or improving efficiency according to requirements, so as to adapt to various operating conditions.

[0005] The present application provides a fan assembly, comprising a fan blade, a volute body and a volute tongue, the fan blade is installed in the volute body, the volute body is provided with an adjusting device, and the adjusting device is used to adjust the gap between the volute tongue and the fan blade.

[0006] Further optimization of the technical scheme of the present application, the adjusting device comprises an adjusting plate and a control mechanism, the adjusting plate is connected with the volute body through the control mechanism, and the control mechanism is used to control the movement of the adjusting plate in the extension direction of the volute tongue.

[0007] Further optimization of the technical scheme of the present application, the control mechanism comprises a control rod and a control rack, the control rod is installed on the volute body, and a gear matched with the control rack is sleeved on the control rod.

[0008] Further optimization of the technical scheme of the present application, the number of control mechanisms is one or more.

[0009] Further optimization of the technical scheme of the present application, a sealing mechanism is arranged between the adjusting device and the volute body, and the sealing mechanism is used to prevent air leakage of the adjusting device.

[0010] Further optimization of the technical scheme of the present application, the adjusting plate comprises a control plate and a flow guide plate, and the adjusting plate is a "V" shaped plate integrally connected by the control plate and the flow guide plate, and the control mechanism is connected with the control plate.

[0011] Further optimization of the technical scheme of the present application, one end of the control plate is provided with an extension plate, and the control rack is opened on the extension plate.

[0012] Further optimization of the technical scheme of the present application, the front end of the guide plate is provided with an angle adjusting device.

[0013] Further optimization of the technical scheme of the present application, the gap between the volute tongue and the fan blade is at most 12.5% of the diameter of the fan blade and at least 6.4% of the diameter of the fan blade.

[0014] An electric appliance comprising the fan assembly of any one of the preceding claims.

[0015] Compared with the prior art, the present application has the advantages that the fan efficiency or noise can be improved by adjusting the volute tongue gap, the efficiency and noise between the volute and other components of the fan can be solved, and different use requirements can be matched. BRIEF DESCRIPTION OF DRAWINGS

[0016] The present application will be described in more detail below based on the embodiments and with reference to the accompanying drawings.

[0017] Figure 1 is the overall structure schematic diagram of the fan assembly in the embodiment of the present application;

[0018] Figure 2 is the exploded structure schematic diagram of the adjusting device in the embodiment of the present application;

[0019] Figure 3 is the driving mode schematic diagram of the control mechanism in the embodiment of the present application;

[0020] Figure 4 is the cross-sectional structure schematic diagram of the fan assembly in the embodiment of the present application;

[0021] Figure 5 is the structure schematic diagram of the maximum gap between the volute tongue and the fan blade in the embodiment of the present application;

[0022] Figure 6 is the structure schematic diagram of the minimum gap between the volute tongue and the fan blade in the embodiment of the present application.

[0023] Reference signs:

[0024] 1-volute body; 2-fan blade; 3-volute tongue; 31-control plate; 32-guide plate; 33-extension plate; 4-sealing box; 5-control mechanism; 51-control rod; 511-control knob; 512-gear; 52-control rack; 53-mounting seat. DETAILED DESCRIPTION

[0025] The present application will be described in more detail below based on the embodiments and with reference to the accompanying drawings. Figures 1-4The application will be further described.

[0026] As Figure 1 shown, the application provides a fan assembly, which comprises a volute body 1, a volute tongue 3 and a fan blade 2, the fan blade 2 is installed in the volute body 1, the volute body 1 is provided with an adjusting device, the adjusting device is used to adjust the gap between the volute tongue 3 and the fan blade 2, the gap of the volute tongue 3 is adjusted by the adjusting device to improve the efficiency of the fan or reduce the noise, which can solve the problem of efficiency and noise between the volute and other components of the fan, thereby matching different use requirements.

[0027] In a specific embodiment, the adjusting device is connected to the volute body 1 through a sealing mechanism, and the adjusting device comprises an adjusting plate and a control mechanism 5, the adjusting plate adjusts the gap of the volute tongue 3 under the action of the control mechanism 5. Preferably, as Figure 1 , Figure 2 and Figure 3 shown, the control mechanism 5 comprises a control rod 51 and a control rack 52 arranged on the adjusting plate, specifically, the sealing mechanism can be designed as a sealing box 4, the control rod 51 is installed on the sealing mechanism through a mounting seat 53, and the outer end of the control rod 51 is provided with a control knob 511, and the end of the control rod 51 extending into the sealing mechanism is sleeved with a gear 512 matched with the control rack 52. And the adjusting plate of the adjusting device is arranged in the sealing mechanism. When in use, the control knob 511 is rotated to drive the control rod 51 to rotate, so as to drive the adjusting plate to perform extension and contraction movement through the gear 512, that is, the flat tongue, short tongue, deep tongue and sharp tongue of the fan volute tongue are changed by controlling the adjusting plate.

[0028] As Figure 2 and Figure 3As shown, the adjusting plate in the technical scheme can be designed as a "V" shaped plate, which specifically includes a control plate 31 and a guide plate 32. The control plate 31 is arranged in the sealing box 4. In order to facilitate installation and maintenance, the sealing box can be designed as two parts, one part is directly connected with the volute body 1, and the other part is detachably arranged at one end, used for sleeving on the extension plate 33 to prevent air leakage of the extension plate. An extension plate 33 is arranged at one end of the control plate 31, and the control rack 52 is arranged on the extension plate 33, which is convenient for control. One or more control mechanisms 5 can be arranged on the control plate 31. Specifically, when the volute tongue 3 is relatively long in the direction parallel to the fan blade 2, one control mechanism 5 can be arranged at each end of the control plate 31, which is more convenient for control. In order to better improve the air outlet efficiency of the fan, the guide plate can be designed as an angle adjustable plate, that is, the guide plate 32 is designed as a component structure, and the free end of the front part is connected with the guide plate body through a rotating shaft and can be adjusted in angle. In this way, the angle of the whole guide plate can be adjusted according to the air outlet, the air pressure of the air outlet is reduced, and the air outlet efficiency is improved.

[0029] Preferably as Figure 4 As shown, the moving distance L0 of the adjusting plate is one fourth of the diameter D of the fan blade 2. By adjusting the position of the volute tongue 3 through the adjusting plate, the volute tongue 3 gap can be changed between 6% D and 12% D, wherein D is the impeller diameter of the multi-blade centrifugal fan blade 2. By changing the volute tongue 3 gap, the noise is reduced or the efficiency is improved, different use requirements are met, the use range of the volute fan assembly is increased, and the cost is reduced.

[0030] An electric appliance containing the fan assembly described in any of the above embodiments can be a household appliance such as an air conditioner, an extractor hood, or an electric appliance with a fan assembly in industry.

[0031] In order to facilitate the understanding of the technical scheme, as Figure 4 As shown in the prior art, the volute profile is usually drawn by the unequal square method. First, the diameter D of the multi-blade centrifugal fan blade 2 and the volute opening A are determined, and then the opening of each section is calculated.

[0032]

[0033]

[0034]

[0035]

[0036]

[0037] wherein q is the calculated flow rate; is the volute width; B is the diameter of the fan blade 2; c′ 2u is the tangential velocity of the air flow after it has exited the blade.

[0038] The lengths of the sides of the four small squares, a, b, c, d, are:

[0039]

[0040]

[0041]

[0042]

[0043] After the lengths of the sides of the four squares are determined, arcs can be drawn with the four square vertices as centers, and the radii of the four arcs, R1, R2, R3, R4, are:

[0044] R1 = D + A - a

[0045]

[0046] R3 = D + A π -c

[0047]

[0048] wherein R1 is the radius of the arc segment vw, R2 is the radius of the arc segment wx, R3 is the radius of the arc segment xy, and R4 is the radius of the arc segment yz, and the four arc segments together form the profile of the volute body. In the present technical solution, the uv segment is the moving path of the volute tongue 3, the length of which is the adjustable range of the volute tongue 3, and the profile thereof is a straight line or an arc line with the same radius as the arc segment vw. When the profile is a straight line, the included angle between the control plate 31 and the tangent line at the point v is 20 degrees. The control plate 31 is connected to the outlet diffuser through the top end of the volute tongue 3, and the top end of the volute tongue 3 is a rounded structure, and the radius R5 of the rounding is preferably 3.75% of D.

[0049] As Figure 5 and Figure 6As shown, when the control plate 31 moves to the maximum distance along the control tooth slot to the direction of the fan blade 2, the clearance L1 of the volute tongue 3 at this time is the minimum value 6.4% D. The relationship between the length H1 of the outlet diffuser part close to the volute tongue 3 and the volute opening A is 109.4% A. Through the control of the parameter, the optimal working efficiency can be achieved according to the performance of the volute body 1, and the noise can be controlled within 70 decibels, which does not seriously affect the surrounding working environment. When the control plate 31 moves to the maximum distance along the tooth slot to the outlet direction, the clearance L2 of the volute tongue 3 at this time is the maximum value 12.5% D. The length H2 of the outlet diffuser part close to the volute tongue 3 is 79.1% A. The sealing box 4 provides a counterforce for the volute tongue 3, which can reduce the noise to the minimum while ensuring relatively good working efficiency. Therefore, the longest distance of the volute tongue 3 in the sealing box 4 is 25% D, the clearance variation range of the volute tongue 3 is (6.4% D, 12.5% D), the length variation range of the outlet diffuser in the volute is (79.1% A, 109.4% A), and the clearance range of the volute tongue 3 is adjusted through control.

[0050] The above-mentioned double-inlet centrifugal fan and single-side knob driving mode are applicable to single-inlet centrifugal fan and double-side knob driving mode. The centrifugal fan and air conditioning system using the application should be within the protection scope of the application.

[0051] Although the application has been described with reference to the preferred embodiments, various modifications can be made to the application and equivalents can be substituted for elements thereof without departing from the scope of the application. In particular, technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A fan assembly, comprising a fan blade, a volute body, and a volute tongue, wherein the fan blade is mounted within the volute body, characterized in that, The volute body is provided with an adjustment device, which is used to adjust the gap between the volute tongue and the fan blade; The adjustment device includes an adjustment plate and a control mechanism. The adjustment plate is connected to the volute body via the control mechanism, which controls the movement of the adjustment plate in the extension direction of the volute tongue. The adjustment plate is located within a sealing mechanism. The adjustment plate includes a control plate and a guide plate, and is a "V"-shaped plate integrally formed by the control plate and the guide plate. The control mechanism is connected to the control plate. An extension plate is provided at one end of the control plate. The sealing mechanism is a sealing box, designed in two parts: one part is directly connected to the volute body, and the other part is detachably located at one end to fit over the extension plate and prevent air leakage at the extension plate position. An angle adjustment device is provided at the front end of the guide plate.

2. The wind turbine assembly according to claim 1, characterized in that: The control mechanism includes a control lever and a control rack. The control lever is mounted on the volute body, and a gear that meshes with the control rack is fitted on the control lever.

3. The wind turbine assembly according to claim 1, characterized in that: The number of control mechanisms can be one or more.

4. The wind turbine assembly according to claim 2, characterized in that: The control rack is located on the extension plate.

5. The wind turbine assembly according to claim 1, characterized in that: The maximum gap between the volute tongue and the fan blade is 12.5% ​​of the fan blade diameter, and the minimum gap is 6.4% of the fan blade diameter.

6. An electrical appliance, characterized in that, It includes the wind turbine assembly as described in any one of claims 1-5.

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