Multi-wing centrifugal fan for range hood and range hood comprising multi-wing centrifugal fan

Abstract

The utility model discloses a multi-wing centrifugal fan for a range hood and the range hood comprising the multi-wing centrifugal fan. The multi-wing centrifugal fan for the range hood comprises a volute and an air inlet, a rectification assembly is installed on the volute and covers the air inlet, the rectification assembly comprises a filter screen part with holes and a plugging part connected with the filter screen part, the plugging part is arranged in the center area of the air inlet in a suspended mode, and the air inlet is communicated with the air inlet. The filter screen part is located in the peripheral area of the air inlet, and the blocking part is of a windtight structure. The air inlet of the centrifugal fan can be protected, oil can be filtered, rectification and noise shielding effects can be achieved, and the actual use experience of a user is improved.

Description

Technical Field

[0001] The utility model relates to the field of range hoods. Background Art

[0002] Existing centrifugal fans, such as multi-blade centrifugal fans, are widely used in various household appliances such as air conditioners, range hoods, air purifiers, and ventilation fans due to their compact structure, high pressure coefficient, large flow coefficient, and low noise.

[0003] When some existing multi-blade centrifugal fans are used in range hoods, especially close-suction range hoods, a mesh filter is usually connected to the air inlet circle. On the one hand, it serves as a protection, and on the other hand, it serves as an oil filter. However, when the airflow passes through the filter, it will add additional noise, affecting the actual user experience. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defect of the multi-blade centrifugal fan in the prior art that the multi-blade centrifugal fan makes a lot of noise when in use, and to provide a multi-blade centrifugal fan for a range hood and a range hood including the multi-blade centrifugal fan.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A multi-blade centrifugal fan for a range hood comprises a volute and an air inlet, wherein a rectification assembly is mounted on the volute, and the rectification assembly covers the air inlet, wherein the rectification assembly comprises a filter portion having pores and a sealing portion connected to the filter portion, the sealing portion is suspended in the central area of ​​the air inlet, the filter portion is located in the peripheral area of ​​the air inlet, and the sealing portion is an airtight structure.

[0007] The area of ​​the blocking part in this solution is blocked and cannot be inlet, while the other areas are the filter part where air can be inlet. After the middle part of the filter part is blocked, the air intake speed of the air inlet is increased under the same air volume, which is conducive to the improvement of the oil fume absorption effect; the blocking part reduces the air intake area of ​​the air inlet, which can reduce the influence of insufficient air intake filling under a small flow state, suppress the degree of air intake turbulence under a small flow state, and play a rectifying effect; at the same time, the blocking part can effectively shield the outward radiation of noise.

[0008] Preferably, the area of ​​the blocking portion is 0.1-0.2 times the area of ​​the air inlet. Thus, after the air inlet area is reduced, the blocking portion can play the role of rectification and noise shielding without reducing the air inlet area too much to deteriorate the fan performance.

[0009] Preferably, the porosity of the filter part is 65%-95%. Thus, the multi-blade centrifugal fan can be in a suitable operating state with a suitable porosity. Too low porosity will deteriorate the fan performance, and too high porosity will weaken the rectification effect.

[0010] Preferably, the projection size of the connecting wires between adjacent holes of the filter part along the axial direction is 0.5mm-2mm. In order to ensure that the ventilation resistance of the filter part is appropriate and the fan performance is not deteriorated, while ensuring the protection strength of the filter part, the wire diameter (defined as the maximum width of a single wire when projected along the impeller axis to the normal plane of the impeller axis) can achieve a better performance balance.

[0011] Preferably, a projection size of a connection line between adjacent holes of the filter portion along the axial direction is 0.5 mm-1 mm.

[0012] Preferably, multiple connecting wires are connected at one connecting point, and the number of connecting wires connected to each connecting point is 3-5. Arranging multiple connecting wires at one connecting point is conducive to eliminating vortex clusters mixed in part of the inlet airflow, and at the same time, the number of 3-5 can also balance the porosity of the filter part so that it will not be too low.

[0013] Preferably, the angle between adjacent connecting wires connecting the same connecting point is not less than 30 degrees. A larger angle can prevent excessive accumulation of local oil stains between the connecting wires during oil filtering.

[0014] Preferably, the multi-blade centrifugal fan for the range hood further comprises a motor and an impeller, a mounting portion for mounting with the rotor of the motor is provided in the middle of the impeller, and the blocking portion is spaced relative to the mounting portion and the rotor of the motor and does not contact each other. Thus, the air entering the area between the blocking portion and the rotor can be ensured not to be interfered by the motor and the rotor, thereby avoiding the turbulence generated to increase the noise.

[0015] Preferably, the rectification assembly includes an air inlet ring, the air inlet ring is connected to the periphery of the filter part, and the air inlet ring is connected to the volute, wherein the inner ring side of the air inlet ring close to the filter part is formed with an upwardly raised guide surface, and the guide surface is arc-shaped. The arc-shaped guide surface can better guide the incoming air to the filter part relative to the outer ring.

[0016] A range hood, comprising the multi-blade centrifugal fan for the range hood.

[0017] The positive progressive effect of the utility model is that the utility model can not only protect the air inlet of the centrifugal fan and filter the oil, but also play the role of rectification and noise shielding, thereby improving the actual use experience of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a schematic diagram of the overall structure of a multi-blade centrifugal fan according to a preferred embodiment of the present invention.

[0019] Figure 2This is a schematic diagram of the internal structure of a multi-blade centrifugal fan according to a preferred embodiment of the utility model.

[0020] Figure 3 It is a three-dimensional schematic diagram of a rectifier assembly according to a preferred embodiment of the utility model.

[0021] Figure 4 It is a front view schematic diagram of a rectifier assembly of a preferred embodiment of the utility model.

[0022] Figure 5 It is a partial enlarged schematic diagram of the filter part of a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0023] The present invention is further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.

[0024] like Figure 1-Figure 5 As shown, the preferred embodiment discloses a multi-blade centrifugal fan for a range hood, including a volute 200 and an air inlet 300 on the volute 200, a rectifying assembly 100 is installed on the volute 200, and the rectifying assembly 100 covers the air inlet 300, wherein the rectifying assembly 100 includes a filter portion 120 with pores and a sealing portion 110 connected to the filter portion 120, the sealing portion 110 is suspended in the central area of ​​the air inlet 300, the filter portion 120 is located in the peripheral area of ​​the air inlet 300, and the sealing portion 110 is an airtight structure.

[0025] like Figure 1 and Figure 2 As shown, the air inlet 300 in this embodiment is a hollow area formed by the inner edge of the impeller 400, that is, an area where air can enter. In practice, in different multi-blade centrifugal fans, it can be a channel that actually enters the inner part from the outside of the multi-blade centrifugal fan. For example, when the inner side of the opening on the volute 200 extends radially inward beyond the inner side of the impeller 400, the inner side of the opening on the volute 200 becomes the actual air inlet 300.

[0026] like Figure 1 As shown, the blocking portion 110 of this example is an airtight structure. That is to say, the blocking portion 110 is an area without air permeability as a whole. When air is admitted, there is no wind penetrating into the area of ​​the blocking portion 110. The blocking portion 110 can be made of a non-porous material, or it can be formed into an airtight structure by stacking multiple layers of porous materials. The blocking portion 110 is suspended in the air so that the blocking portion 110 does not contact with other parts except the filter portion 120. In physical space, the blocking portion 110 is shielded at the center area of ​​the air inlet 300 in this suspended manner, thereby avoiding interference of other structures on rectification and noise reduction.

[0027] like Figure 1 As shown, the filter part 120 of this embodiment is a mesh structure with pores. In other embodiments, it can also be various structures with pores. When air is taken in, external wind enters the filter part 120 through the pores.

[0028] The area of ​​the blocking part 110 in this embodiment is blocked and cannot be inlet, while the other area is the filter part 120 which can be inlet. After the filter part 120 blocks the middle part, the air intake speed of the air inlet 300 is increased under the same air volume, which is conducive to the improvement of the oil fume absorption effect; the blocking part 110 reduces the air intake area of ​​the air inlet 300, which can reduce the influence of insufficient air intake filling under a small flow state, suppress the degree of air intake turbulence under a small flow state, and play a rectifying effect; at the same time, the blocking part 110 can effectively shield the outward radiation of noise.

[0029] like Figure 1 and Figure 3 As shown, the fairing assembly 100 of this embodiment can be removed from the volute 200 as a whole, and in other embodiments, it can also be removed as multiple parts. Among them, this embodiment is preferably connected by threaded fasteners, which can be more convenient to install and remove.

[0030] like Figure 1 and Figure 2 As shown, the area of ​​the blocking portion 110 of this embodiment is 0.1-0.2 times the area of ​​the air inlet 300. Therefore, after the air inlet area is reduced, the blocking portion 110 can not only play the role of rectifying and shielding noise, but also does not reduce the air inlet area too much to deteriorate the fan performance.

[0031] Table 1. Comparison of noise at the same flow rate with different plugging area

[0032]

[0033] Table 1 shows that compared with no rectifier assembly, that is, the air inlet is completely open (such as Figure 2 The noise in the state shown in the figure is used as a comparison basis, and the area of ​​the blocking part 110 is changed under the same air flow condition to obtain the noise difference with the comparison basis. Among them, relevant parameters such as wire diameter and porosity are kept consistent. It can be seen that when the area of ​​the blocking part 110 is 0.1-0.2 times the area of ​​the air inlet 300, there is smaller noise. Especially when it is 0.1-0.15 times, there is a more significant small noise. However, when the area of ​​the blocking part 110 is larger, the deterioration of the air intake condition caused by the too small air intake area leads to an increase in noise.

[0034] In a preferred embodiment, the porosity of the filter part 120 of this embodiment is 65%-95%. Thus, the multi-blade centrifugal fan can be in a suitable operating state with a suitable porosity. Too low a porosity will deteriorate the fan performance, and too high a porosity will weaken the rectification effect. Among them, the porosity refers to the ratio of the area of ​​the hole 123 to the area of ​​the filter part 120 as a whole.

[0035] Table 2. Comparison of noise at the same flow rate with different porosity

[0036]

[0037] Table 2 shows that compared with no rectifier assembly, that is, the air inlet is completely open (such as Figure 2 The noise at the state shown in the figure is used as the comparison basis, and the porosity is changed under the same air flow condition to obtain the noise difference with the comparison basis. Among them, the relevant parameters such as the wire diameter and the plugging area are kept consistent. It can be seen that when the porosity is 65%-95%, there is less noise. Especially when it is 76.98%-95.00%, there is a more significant small noise.

[0038] like Figure 5 As shown, in a preferred embodiment, the projection size of the connecting wire 121 between adjacent holes 123 of the filter part 120 along the axial direction (i.e., wire diameter) is 0.5mm-2mm. In order to ensure that the ventilation resistance of the filter part 120 is appropriate and the fan performance is not deteriorated, while ensuring the protection strength of the filter part 120, the wire diameter (defined as the maximum width of a single wire when projected along the axial direction of the impeller 400 to the normal plane of the impeller 400 axis) can achieve a better performance balance according to this setting.

[0039]

[0040] Table 3 shows that compared with no rectifier assembly, that is, the air inlet is completely open (such as Figure 2 The noise at the state shown in the figure is used as the comparison basis. The wire diameter is changed under the same air flow condition to obtain the noise difference with the comparison basis. Among them, the relevant parameters such as porosity and plugging area are kept consistent. It can be seen that when the wire diameter is 0.5mm-2mm, there is smaller noise. Especially when it is 0.5mm-1mm, there is a more significant small noise.

[0041] like Figure 5 As shown, in a preferred embodiment, a plurality of connecting wires 121 are connected at a connecting point 122, and the number of connecting wires 121 connected to each connecting point 122 is 3-5. Arranging a plurality of connecting wires 121 at a connecting point 122 is conducive to eliminating part of the vortex clusters mixed in the intake air flow, and at the same time, the number of 3-5 can also balance the porosity of the filter part 120 so that it will not be too low.

[0042] like Figure 5 As shown, in a preferred embodiment, the angle between adjacent connecting wires 121 connecting the same connecting point 122 is not less than 30 degrees. A larger angle can prevent excessive accumulation of local oil stains between the connecting wires 121 during oil filtering.

[0043] like Figure 2 As shown, in a preferred embodiment, the multi-blade centrifugal fan for the range hood also includes a motor and an impeller 400. A mounting portion 420 for mounting with the rotor of the motor is provided in the middle of the impeller 400. The blocking portion 110 is spaced relative to the mounting portion 420 and the rotor of the motor (not shown in the figure), and they do not contact each other. The air intake entering the area between the blocking portion 110 and the rotor can be ensured not to be interfered with by the motor and the rotor, avoiding the turbulence generated to increase the noise. In this embodiment, the mounting portion 420 is connected to the outer ring structure of the impeller 400 through a plurality of radially extending connecting portions 410, but it is not limited to the outer ring connection method of the impeller 400 in which the mounting portion is provided in this manner.

[0044] like Figure 2 As shown, in a preferred embodiment, the rectifier assembly 100 includes an air inlet ring 130, which is connected to the periphery of the filter part 120, and the air inlet ring 130 is connected to the volute 200, wherein an upwardly raised guide surface 131 is formed on the inner ring side of the air inlet ring 130 close to the filter part 120, and the guide surface 131 is arc-shaped. The arc-shaped guide surface 131 can better guide the incoming air to the filter part 120 relative to the outer ring.

[0045] This embodiment also discloses a range hood, which includes a multi-blade centrifugal fan for the range hood. Since the improvement of this embodiment lies in the improvement of the rectifying assembly 100, the volute 200 and the internal structure do not need to be modified, so it can be adapted to various range hoods using multi-blade centrifugal fans.

[0046] The utility model can not only protect the air inlet 300 of the centrifugal fan and filter oil, but also perform the functions of rectification and noise shielding, thereby improving the actual use experience of users.

[0047] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A multi-blade centrifugal fan for a range hood, comprising a volute and an air inlet, characterized in that: A rectification assembly is installed on the volute, and the rectification assembly covers the air inlet, wherein the rectification assembly includes a filter portion with pores and a sealing portion connected to the filter portion, the sealing portion is suspended in the central area of ​​the air inlet, the filter portion is located in the peripheral area of ​​the air inlet, and the sealing portion is an airtight structure.

2. The multi-blade centrifugal fan for a range hood according to claim 1, characterized in that: The area of ​​the blocking portion is 0.1-0.2 times the area of ​​the air inlet.

3. The multi-blade centrifugal fan for a range hood according to claim 1, characterized in that: The porosity of the filter part is 65%-95%.

4. The multi-blade centrifugal fan for a range hood according to claim 3, characterized in that: The projection size of the connecting wires between adjacent holes of the filter part along the axial direction is 0.5mm-2mm.

5. The multi-blade centrifugal fan for a range hood according to claim 4, characterized in that: The projection size of the connection line between adjacent holes of the filter part along the axial direction is 0.5mm-1mm.

6. The multi-blade centrifugal fan for a range hood according to claim 4, characterized in that: A plurality of connecting wires are connected at a connecting point, and the number of connecting wires connected to each connecting point is 3-5.

7. The multi-blade centrifugal fan for a range hood according to claim 6, characterized in that: The angle between adjacent connecting wires connecting the same connection point shall not be less than 30 degrees.

8. The multi-blade centrifugal fan for a range hood according to any one of claims 1 to 7, characterized in that: The multi-blade centrifugal fan for the range hood also includes a motor and an impeller. A mounting portion for mounting with the rotor of the motor is provided in the middle of the impeller. The blocking portion is spaced apart from the mounting portion and the rotor of the motor and does not contact each other.

9. The multi-blade centrifugal fan for a range hood according to claim 1, characterized in that: The rectification assembly includes an air inlet ring, which is connected to the periphery of the filter part and is connected to the volute, wherein an upwardly raised guide surface is formed on the inner ring side of the air inlet ring close to the filter part, and the guide surface is arc-shaped.

10. A range hood, characterized in that: The range hood comprises a multi-blade centrifugal fan for a range hood as claimed in any one of claims 1 to 9.

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