Multi-wing centrifugal fan and range hood comprising same

Abstract

The utility model provides a multi-wing centrifugal fan and a range hood comprising the same, the multi-wing centrifugal fan comprises a volute, an air inlet of the volute is covered with a filter screen, the filter screen is rotatably connected to the air inlet, the multi-wing centrifugal fan further comprises a driving part, the driving part is arranged on the peripheral side of the volute, and the driving part is arranged on the peripheral side of the volute. The outer edge of the filter screen abuts against an output shaft of the driving part, and the rotating speed of the filter screen ranges from 5 r / min to 15 r / min. The driving part is additionally arranged to independently drive the filter screen to rotate, so that the rotating speed of the filter screen can be independently adjusted, the rotating speed of the filter screen is limited, the rotating speed of the filter screen is lower relative to the rotating speed of the impeller, air inlet shielding caused by high-speed rotating of the filter screen is avoided, and air inlet resistance is reduced; the filter screen rotating at a low speed can solve the problem that oil stains are not uniformly accumulated on a fixed screen cover, the use safety of the rotating filter screen is improved, a protection structure does not need to be additionally arranged, and noise generated when the rotating filter screen is used is reduced.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a multi-blade centrifugal fan and a range hood containing the same. Background Technology

[0002] Multi-blade centrifugal fans are widely used in various household appliances such as air conditioners, range hoods, air purifiers, and exhaust fans due to their compact structure, high pressure coefficient, large flow coefficient, and low noise. Typically, when used in close-range range hoods, because the fan is installed low and closer to the user, a mesh cover is installed on the fan's air inlet collector. The mesh cover serves three main functions: first, safety protection, preventing users from directly contacting the high-speed rotating impeller inside the fan; second, oil filtration, removing some grease from the incoming airflow to maintain the cleanliness of the fan's interior; and third, airflow stabilization and noise reduction, as the mesh cover breaks up vortices and disperses the airflow, reducing turbulence and thus achieving noise reduction.

[0003] Due to the inherent aerodynamic characteristics of multi-blade centrifugal fans, the airflow distribution at the fan inlet is uneven. As use progresses, the degree of oil accumulation varies significantly across different areas of the inlet screen, with areas receiving more airflow accumulating more oil and areas receiving less accumulating less. Areas with higher oil accumulation will experience increased airflow resistance, causing the airflow that should have entered the fan from areas with higher airflow to deviate from its intended path. This leads to increased turbulence within the fan, disrupts aerodynamic balance, and ultimately increases fan noise, negatively impacting the user experience.

[0004] In existing technologies, the filter screen is designed to rotate, and the rotating filter screen is driven by a fan drive motor. The drive motor also drives the impeller to rotate, which makes the filter screen rotate at a very high speed. Although this can solve the problem of uneven oil accumulation on the screen, the safety of the high-speed rotating filter screen is questionable, and additional safety protection is needed. In addition, the high-speed rotating filter screen is noisy and will have a certain air intake shielding effect, increasing air intake resistance, resulting in a poor user experience. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art, such as high noise, high air intake resistance and poor safety when the filter screen is driven by the motor driving the impeller, and to provide a multi-blade centrifugal fan and a range hood containing the same.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] A multi-blade centrifugal fan includes a volute casing, a filter screen is provided at the air inlet of the volute casing, and the filter screen is rotatably connected to the air inlet. The multi-blade centrifugal fan also includes:

[0008] The drive unit is located on the outer periphery of the volute, and the outer edge of the filter screen abuts against the output shaft of the drive unit. The rotational speed of the filter screen is in the range of 5-15 r / min.

[0009] In this solution, an additional drive unit is added to drive the filter screen to rotate independently, allowing the filter screen's rotation speed to be adjusted separately. This limits the filter screen's rotation speed to be lower than the impeller's speed, preventing the filter screen from forming an air intake shield due to high-speed rotation and reducing air intake resistance. At the same time, the low-speed rotation of the filter screen can solve the problem of uneven oil accumulation on the fixed screen cover, improving the safety of using the rotating filter screen. No additional protective structure is required, and the noise during the use of the rotating filter screen is reduced.

[0010] Preferably, the multi-blade centrifugal fan further includes an air guide ring, which is disposed around the outer periphery of the filter screen and integrally formed with the filter screen, and the output shaft of the drive unit abuts against the outer edge of the air guide ring.

[0011] In this solution, the above settings allow the air guide ring to rotate as the filter screen rotates, thus avoiding the situation where the output shaft cannot effectively contact the outer edge of the filter screen due to its thin outer edge.

[0012] Preferably, the outer edge of the air guide ring is provided with teeth, and the driving part further includes a driving gear, which is disposed on the output shaft and meshes with the teeth.

[0013] In this solution, the above settings are used to enable the output shaft to drive the air guide ring and filter screen to rotate effectively.

[0014] Preferably, a connecting portion is provided in the circumferential direction of the volute near the air inlet, and the air guide ring is detachably connected to the air inlet through the connecting portion.

[0015] In this solution, the above-mentioned settings are used to prevent the filter and air guide ring from falling off the volute when they rotate.

[0016] Preferably, the connecting part is a magnet.

[0017] In this solution, the above-mentioned settings enable a detachable connection between the air guide ring and the filter screen and the volute.

[0018] Preferably, multiple connecting portions are provided, and the multiple connecting portions are arranged sequentially at intervals along the circumferential direction of the air inlet.

[0019] In this solution, the above settings are used to improve connection stability.

[0020] Preferably, a rotating track is also provided in the circumferential direction of the volute near the air inlet, and the air guide ring is partially embedded in the rotating track.

[0021] In this solution, the above settings are used to guide the rotation of the air guide ring and filter screen, making their rotation more stable.

[0022] Preferably, the air guide ring is provided with a groove, the groove is annular, the groove is recessed towards the rotating track and the bottom of the groove is located inside the rotating track.

[0023] In this solution, the above settings are used to improve the reliability and stability of the guidance.

[0024] Preferably, the rotating track is offset from the connecting part.

[0025] In this solution, the above-mentioned arrangement is used to avoid interference between the connecting part and the air guide ring when the connecting part is located inside the rotating track.

[0026] A range hood, the range hood comprising the multi-blade centrifugal fan as described above.

[0027] In this solution, the range hood includes the aforementioned multi-blade centrifugal fan to prevent uneven oil accumulation in certain areas of the filter screen. At the same time, it reduces air intake resistance, improves safety, reduces noise during use, and enhances the user experience.

[0028] The positive and progressive effects of this utility model are as follows: By additionally setting a drive unit to drive the filter screen to rotate independently, the rotation speed of the filter screen can be adjusted independently, thereby limiting the rotation speed of the filter screen to a lower speed relative to the impeller speed. This avoids the filter screen from forming an air intake shield due to high-speed rotation, reducing air intake resistance. At the same time, the low-speed rotation of the filter screen can solve the problem of uneven accumulation of oil stains on the fixed screen cover, improve the safety of using the rotating filter screen, eliminate the need for additional protective structures, and reduce the noise when using the rotating filter screen. Attached Figure Description

[0029] Figure 1 This is a perspective view of a multi-blade centrifugal fan according to a preferred embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of the drive unit of a preferred embodiment of the present invention.

[0031] Figure 3 This diagram shows the positional relationship between the connecting part and the rotating track in a preferred embodiment of the present invention.

[0032] Figure 4This is a diagram showing the positional relationship between the groove and the rotating track in a preferred embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] Snail shell 1

[0035] Filter 2

[0036] Drive Unit 3

[0037] Drive gear 31

[0038] Air guide ring 4

[0039] Tooth 41

[0040] Groove 42

[0041] Connecting part 5

[0042] Rotating track 6 Detailed Implementation

[0043] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0044] This embodiment provides a multi-blade centrifugal fan, the specific structure of which is as follows: Figure 1 and Figure 2 As shown, the multi-blade centrifugal fan includes a volute 1, a filter screen 2 is installed at the air inlet of the volute 1, and the filter screen 2 is rotatably connected to the air inlet. The multi-blade centrifugal fan also includes:

[0045] The drive unit 3 is located on the outer periphery of the volute 1. The outer edge of the filter screen 2 abuts against the output shaft of the drive unit 3. The rotational speed of the filter screen 2 is in the range of 5-15 r / min.

[0046] Specifically, the drive unit 3 is a servo motor as in the prior art. A bracket is provided on the annular wall of the volute 1 to support the drive unit 3. The output shaft of the drive unit 3 abuts against the outer edge of the filter screen 2, thereby driving the filter screen 2 to rotate. The filter screen 2 is coaxially arranged with the air inlet of the volute 1 and rotates around the axis of the air inlet; this is prior art and will not be elaborated further. By additionally setting the drive unit 3 to drive the filter screen 2 to rotate independently, compared to the method where the filter screen 2 is synchronously driven by the motor driving the impeller in the volute 1, the rotational speed of the filter screen 2 can be adjusted independently, thereby limiting the rotational speed of the filter screen 2 to a lower speed relative to the impeller speed. This prevents the filter screen 2 from forming an air intake shield due to high-speed rotation and reduces air intake resistance.

[0047] Meanwhile, the low-speed rotating filter screen 2 can solve the problem of uneven oil accumulation on different fixed mesh covers. The limited rotation speed of the filter screen 2 improves the safety of the rotating filter screen, eliminating the need for additional protective structures and reducing the noise during the use of the rotating filter screen.

[0048] In this embodiment, to reduce the user's perception of the rotation and start-up of the filter 2, the impeller fan is started first after the multi-blade centrifugal fan is turned on, and the drive unit 3 is started after a delay of 3-5 seconds; when the multi-blade centrifugal fan is turned off, the drive unit 3 is turned off first, and the impeller fan is turned off after a delay of 3-5 seconds.

[0049] Furthermore, in this embodiment, the multi-blade centrifugal fan also includes an air guide ring 4, which is arranged around the outer periphery of the filter screen 2 and integrally formed with the filter screen 2. The output shaft of the drive unit 3 abuts against the outer edge of the air guide ring 4.

[0050] Specifically, the air guide ring 4 is an annular structure and is fitted onto the outer periphery of the filter screen 2. The air guide ring 4 and the filter screen 2 are integrally formed. Therefore, when the output shaft abuts against the outer edge of the air guide ring 4, the rotation of the output shaft drives the air guide ring 4 and the filter screen 2 to rotate synchronously. Compared to the output shaft directly contacting the outer edge of the filter screen 2, this avoids the situation where the output shaft cannot effectively contact the outer edge of the filter screen due to its thin outer edge and small contact area.

[0051] In this embodiment, the outer edge of the air guide ring 4 is provided with teeth 41, and the drive unit 3 also includes a drive gear 31, which is disposed on the output shaft and meshes with the teeth 41.

[0052] Specifically, the tooth 41 is a toothed structure in the prior art. The tooth 41 is set on the outer edge of the air guide ring 4. The drive gear 31 is coaxially set with the output shaft. The drive gear 31 meshes with the tooth 41 so that when the output shaft rotates, the drive gear 31 rotates synchronously and drives the air guide ring 4 with the tooth 41 and the filter screen 2 to rotate.

[0053] In other embodiments, the outer edge of the air guide ring 4 may also be a rough surface, and the surface of the output shaft may also be a rough surface, so as to increase the friction force when the output shaft and the outer edge of the air guide ring 4 directly abut against each other, thereby driving the air guide ring 4 and the filter screen 2 to rotate effectively.

[0054] In another embodiment, an annular belt with a rough surface can be fitted around the outer edge of the air guide ring 4. The output shaft drives the air guide ring 4 and the filter screen 2 to rotate by contacting the belt. It is understood that the belt is a transmission structure in the prior art, and this embodiment has not improved it. The belt can be fitted around the outer edge of the air guide ring 4 or around the surface of the output shaft, which will not be described in detail here.

[0055] like Figure 3 As shown, in this embodiment, a connecting part 5 is provided in the circumferential direction of the volute 1 near the air inlet, and the air guide ring 4 is detachably connected to the air inlet through the connecting part 5.

[0056] Specifically, the connecting part 5 is attached to the volute 1 along the circumferential direction of the air inlet and is located close to the air inlet. The connecting part 5 can be a buckle as in the prior art. Correspondingly, the air guide ring 4 is provided with a slot corresponding to the connecting part 5, or the connecting part 5 is a slot and the air guide ring 4 is provided with a buckle. The buckle and the slot cooperate with each other to prevent the filter screen 2 and the air guide ring 4 from falling off the volute 1 when they rotate, thereby improving the safety of use.

[0057] In this embodiment, the connecting part 5 is a magnet. The magnet can be a powerful magnet as in the prior art, or a permanent magnet. The air guide ring 4 is made of a metal material that can be attracted to a magnet, such as iron. This allows for a detachable connection between the air guide ring 4, the filter 2, and the volute 1.

[0058] In this embodiment, multiple connecting parts 5 are provided, and the multiple connecting parts 5 are arranged at intervals along the circumference of the air inlet. Taking four connecting parts 5 as an example, the four connecting parts 5 are arranged at intervals so as to increase the number of connecting parts 5 and adsorb the air guide ring 4 at different positions, thereby improving the stability of the connection.

[0059] like Figure 4 As shown, in this embodiment, a rotating track 6 is also provided in the circumferential direction of the volute 1 near the air inlet, and the air guide ring 4 is partially embedded in the rotating track 6.

[0060] Specifically, the rotating track 6 is an annular groove, and the side portion of the air guide ring 4 is embedded within the rotating track 6. This allows the rotating track 6 to guide the air guide ring 4 and filter 2 as they rotate, preventing them from deviating from the axis of the air inlet and ensuring smoother rotation. It is understood that an annular groove has a larger rotation range than a semi-circular or arc-shaped groove, making it suitable for both forward and reverse rotation.

[0061] In this embodiment, the air guide ring 4 is provided with a groove 42, which is an annular structure. The groove 42 is recessed towards the rotating track 6, and the bottom of the groove 42 is located inside the rotating track 6. By corresponding to the groove 42 on the air guide ring 4, which is also an annular groove with the same shape, it is more stable during rotation. By extending the bottom of the groove into the rotating track 6, the air guide ring 4 is partially embedded in the rotating track 6, thereby improving the reliability and stability of the guidance.

[0062] In this embodiment, the rotating track 6 and the connecting portion 5 are offset. It is understood that multiple connecting portions 5 are located in the same circumferential direction, while the rotating track 6 is located in another circumferential direction, with different diameters in the two directions. Compared to having the connecting portion 5 located within the rotating track 6, this offset arrangement avoids interference between the groove 42 and the connecting portion 5 when the rotating track 6 rotates. This prevents the safety issue of the air guide ring 4 detaching from the volute 1 due to interference.

[0063] This embodiment also provides a range hood that includes the aforementioned multi-blade centrifugal fan to avoid uneven accumulation of oil stains in some areas of the filter 2. At the same time, it reduces air intake resistance, improves safety, reduces noise during use, and enhances the user experience.

[0064] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A multi-blade centrifugal fan comprising a volute, a filter screen being provided at an air inlet of the volute, the filter screen being rotatably connected to the air inlet, characterized in that, The multi-wing centrifugal fan further comprises: The driving part is arranged on the outer circumferential side of the volute, the outer edge of the filter screen abuts against the output shaft of the driving part, and the rotational speed of the filter screen ranges from 5 r / min to 15 r / min.

2. The multiple-blade centrifugal fan as set forth in claim 1, wherein The multi-wing centrifugal fan further comprises a wind guide ring, which is annularly arranged on the outer circumferential side of the filter screen and integrally formed with the filter screen, and the output shaft of the driving part abuts against the outer edge of the wind guide ring.

3. The multi-bladed centrifugal fan of claim 2, wherein The outer edge of the wind guide ring is provided with a tooth, and the driving part further comprises a driving gear, which is arranged on the output shaft and engaged with the tooth.

4. The multiple-blade centrifugal fan as set forth in claim 2, wherein A connecting part is arranged in the circumferential direction of the volute close to the air inlet, and the wind guide ring is detachably connected to the air inlet through the connecting part.

5. The multiple-blade centrifugal fan as set forth in claim 4, wherein The connecting part is a magnet.

6. The multiple-blade centrifugal fan as set forth in claim 4, wherein A plurality of connecting parts are arranged, and the plurality of connecting parts are sequentially and spacedly arranged in the circumferential direction of the air inlet.

7. The multiple-blade centrifugal fan as set forth in claim 4, wherein A rotating track is further arranged in the circumferential direction of the volute close to the air inlet, and the wind guide ring is partially embedded in the rotating track.

8. The multiple-blade centrifugal fan as set forth in claim 7, wherein A groove is arranged on the wind guide ring, the groove is annular in structure, the groove is recessed towards the rotating track, and the groove bottom is located in the rotating track.

9. The multiple-blade centrifugal fan as set forth in claim 7, wherein The rotating track and the connecting part are arranged staggeredly.

10. A range hood characterized by, The range hood comprises the multi-wing centrifugal fan according to any one of claims 1-9.

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