Impeller and centrifugal fan and extractor hood comprising same

Abstract

The utility model provides a kind of impeller and centrifugal fan, range hood comprising it, impeller includes several annular distribution blades and motor located at impeller axis, motor is located in the secondary air inlet area of impeller, motor includes front cover, back cover and mounting disc, mounting disc is located at the junction of the front cover and back cover of motor, mounting disc extends outward along the radial direction of motor, along the axial direction of the motor, the mounting disc deviates the middle region of the motor and is set, and the mounting disc deviates the air inlet of the secondary air inlet area of the impeller and is set. By moving the larger area mounting disc to the impeller root of secondary air inlet area, the interference of mounting disc to secondary air inlet area is weakened, the effective air inlet area of secondary air inlet area is improved, the invalid area of impeller secondary air inlet area is reduced, the air inlet of impeller root of secondary air inlet area is more sufficient, the flow of secondary air inlet area is increased, dead zone and vortex area are reduced, and then the flow of whole machine is improved and noise is reduced.

Description

Technical Field

[0001] This utility model specifically relates to an impeller and a centrifugal fan and range hood containing the impeller. Background Technology

[0002] Currently, the centrifugal fan systems used in range hoods are divided into single-suction and dual-suction structures. Dual-suction range hoods, due to their advantage of having air intake from both sides, have better utilization of the fan's height and can increase the fan's airflow, hence their widespread use in current range hoods. As the power unit of the range hood, the centrifugal fan is driven by a motor to power the centrifugal impeller. For dual-suction fan systems, the motor bracket is generally fixed to the air intake side wall of the volute casing, and the motor rotor is sealed by upper and lower covers and fixed to the bracket. Because the motor side occupies some air intake space, the airflow on that side is less; generally, the side with the motor installed is called the secondary air intake, and the other side is called the main air intake.

[0003] Due to the high flow rate requirements of fans, the diameter and height of motors used in range hoods are currently quite large, resulting in larger motor mounting plates. For reasons related to motor installation stability, the mounting plates are typically located in the middle of the motor. This means the mounting plate is relatively close to the secondary air inlet after installation. For small fan systems, the large diameter of the mounting plate and the small distance between its outer edge and the impeller's inner diameter lead to poor secondary air inlet conditions, affecting overall machine performance and flow rate. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of poor air intake conditions in the secondary air intake area of ​​the prior art, which leads to poor overall performance and small flow rate, and to provide an impeller and a centrifugal fan and range hood containing the impeller.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] An impeller includes a plurality of blades arranged in a ring and a motor located at the axis of the impeller. The motor is located in the secondary air inlet area of ​​the impeller. The motor includes a front cover, a rear cover, and a mounting plate. The mounting plate is located at the connection between the front cover and the rear cover of the motor. The mounting plate extends outward along the radial direction of the motor. Along the axial direction of the motor, the mounting plate is offset from the middle area of ​​the motor and is located away from the air inlet of the secondary air inlet area of ​​the impeller.

[0007] In this design, by offsetting the mounting plate from the center of the motor, the mounting plate is asymmetrically positioned between the first and second ends of the motor. Furthermore, the mounting plate is positioned further towards the center of the impeller. By moving the larger mounting plate towards the impeller root in the secondary air intake area, this design significantly reduces the impact of the mounting plate on the airflow in the secondary air intake area of ​​the impeller. It weakens the obstruction and interference of the mounting plate, increases the effective air intake area of ​​the secondary air intake area, reduces the ineffective area of ​​the impeller's secondary air intake area, and ensures more sufficient airflow at the impeller root in the secondary air intake area. This increases the flow rate in the secondary air intake area, reduces dead zones and vortex areas, thereby increasing the overall flow rate and reducing noise. Simultaneously, the offset positioning of the mounting plate towards the center of the impeller brings the center of gravity of the motor and impeller assembly closer to the motor mounting plate, reducing impeller vibration.

[0008] Preferably, the mounting plate includes a first mounting member and a second mounting member. The first mounting member is integrally formed with the front cover, and the second mounting member is integrally formed with the rear cover. The first mounting member and the second mounting member are provided with connecting holes, and the first mounting member and the second mounting member are connected by bolts passing through the connecting holes.

[0009] In this solution, the front cover and the rear cover are connected to form a whole, and the first mounting component and the second mounting component are connected to form a whole mounting plate.

[0010] Preferably, the extension dimension of the front cover is smaller than the extension dimension of the rear cover along the axial direction of the motor.

[0011] In this solution, the above settings ensure that the mounting plate is positioned towards the impeller root in the secondary air intake area, i.e., offset from the middle area of ​​the motor.

[0012] Preferably, along the axial direction of the motor, the extension dimension of the front cover accounts for 0.2-0.5 of the total length of the motor.

[0013] In this solution, the above settings limit the extension size of the front cover, thereby ensuring that the air intake volume of the secondary air intake area is increased.

[0014] Preferably, the thickness of the first mounting member is the same as the thickness of the second mounting member.

[0015] In this solution, the above settings are used to ensure the stability of the connection between the first mounting component and the second mounting component.

[0016] Preferably, the impeller further includes a central disk, the output end of the motor is connected to the central disk, the blades are connected to the outer edge of the central disk, the central disk is disposed in the middle region of the impeller along the axial direction of the impeller, and the axis of the central disk coincides with the axis of the impeller.

[0017] In this scheme, the blades are driven by a motor through the above settings.

[0018] Preferably, one side of the central plate is recessed and formed into a profile corresponding to the motor, and the recess of the profile is directed away from the motor and toward the main air intake area of ​​the impeller.

[0019] In this scheme, the above settings are used to utilize the airflow from the main air intake area through the compression guide to improve the aerodynamic performance of the impeller.

[0020] Preferably, the depth of the indentation in the molding is in the range of 0-10 mm.

[0021] In this solution, by limiting the depth of the molded profile, the depth of the molded profile facing the main air intake area is reduced, thereby improving the air intake conditions of the main air intake area, reducing the impact of the increased axial wind speed caused by the small impeller inlet diameter on the central plate, increasing the impeller flow rate and reducing noise.

[0022] A centrifugal fan, the centrifugal fan comprising the impeller as described above.

[0023] In this design, the centrifugal fan includes the aforementioned impeller, with the motor mounting plate positioned away from the air inlet of the secondary air inlet area. This reduces the impact of the mounting plate on the air intake of the impeller's secondary air inlet area, weakens the obstruction and interference of the mounting plate, increases the effective air intake area of ​​the secondary air inlet area, reduces the ineffective area of ​​the impeller's secondary air inlet area, and makes the air intake at the impeller root in the secondary air inlet area more sufficient, increasing the flow rate of the secondary air inlet area, reducing dead zones and vortex areas, thereby increasing the overall flow rate and reducing noise.

[0024] A range hood comprising a centrifugal fan as described above.

[0025] In this solution, the range hood includes the aforementioned centrifugal fan to improve the aerodynamic performance of the range hood while ensuring sufficient airflow. Furthermore, due to the offset mounting plate, the intake noise is reduced, and the center of gravity is more closely aligned with the impeller's center of gravity, reducing vibration. As a result, the range hood with this centrifugal fan operates with less noise, improving the user experience.

[0026] The positive and progressive effects of this utility model are as follows: By offsetting the mounting plate from the middle area of ​​the motor, the mounting plate is asymmetrically positioned between the first and second ends of the motor. Furthermore, the mounting plate is positioned more towards the middle area of ​​the impeller. By moving the larger mounting plate towards the impeller root in the secondary air intake area, this design significantly reduces the impact of the mounting plate on the air intake of the impeller's secondary air intake area, weakening its obstruction and interference. This increases the effective air intake area of ​​the secondary air intake area, reduces the ineffective area of ​​the impeller's secondary air intake area, and ensures more sufficient air intake at the impeller root in the secondary air intake area, increasing the flow rate of the secondary air intake area, reducing dead zones and vortex areas, thereby improving the overall flow rate and reducing noise. Simultaneously, the offset positioning of the mounting plate towards the middle area of ​​the impeller brings the center of gravity of the motor and impeller assembly closer to the motor mounting plate, reducing impeller vibration. Attached Figure Description

[0027] Figure 1 This is a perspective view of the impeller of a preferred embodiment of the present invention.

[0028] Figure 2 This diagram shows the positional relationship between the mounting plate and the air inlet of the secondary air inlet area in a preferred embodiment of the present invention.

[0029] Figure 3 This is a perspective view of a motor according to a preferred embodiment of the present invention.

[0030] Figure 4 This is a perspective view of a centrifugal fan according to a preferred embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] Leaf 1

[0033] Motor 2

[0034] Front cover 21

[0035] Back cover 22

[0036] Installation disk 23

[0037] First installation component 231

[0038] Second mounting component 232

[0039] Secondary air intake zone 3

[0040] Main intake area 4

[0041] Mid-game 5

[0042] Compression molding 51 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 an impeller, the specific structure of which is as follows: Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the impeller includes several blades 1 arranged in a ring and a motor 2 located on the impeller axis. The motor 2 is located in the secondary air inlet area 3 of the impeller. The motor 2 includes a front cover 21, a rear cover 22 and a mounting plate 23. The mounting plate 23 is located at the connection between the front cover 21 and the rear cover 22 of the motor 2. The mounting plate 23 extends outward along the radial direction of the motor 2. Along the axial direction of the motor 2, the mounting plate 23 is offset from the middle area of ​​the motor 2 and is located away from the air inlet of the secondary air inlet area 3 of the impeller.

[0045] Specifically, several ring-shaped blades 1 have air inlets at both ends for the main air inlet zone 4 and the secondary air inlet zone 3. The motor 2 is located within the secondary air inlet zone 3, ensuring that the airflow rate in the main air inlet zone 4 is greater than that in the secondary air inlet zone 3, even when the motor 2 occupies space within the secondary air inlet zone 3. The blades 1 are connected to and driven by the motor 2; this is existing technology and will not be elaborated upon further. In this embodiment, the mounting plate 23 extends outward from the radial direction of the motor 2. Since the diameter of the mounting plate 23 is larger than the diameter of the front cover 21 or the rear cover 22, the mounting plate 23 is closer to the blade 1. In the traditional motor 2, the mounting plate 23 is located in the middle area of ​​the motor 2. That is to say, the front cover 21 and the rear cover 22 extend in the same dimension along the axis of the motor 2. The front cover 21 and the rear cover 22 are symmetrically arranged with the plane where the mounting plate 23 is located as the axis. Based on this, the mounting plate 23 is symmetrically arranged, so that the mounting plate 23 with a larger diameter is closer to the air inlet of the secondary air inlet area 3, thereby generating a certain resistance to the airflow flowing from the air inlet into the secondary air inlet area 3.

[0046] In this embodiment, the mounting plate 23 is not symmetrically arranged in the middle area of ​​the motor 2 along the axial direction of the motor 2. Instead, the mounting plate 23 is offset and positioned away from the air inlet of the secondary air inlet zone 3 of the impeller. In other words, the mounting plate 23 is positioned closer to the impeller root of the secondary air inlet zone 3 of the impeller to free up the space that was originally close to the air inlet of the secondary air inlet zone 3. By moving the larger mounting plate 23 towards the impeller root of the secondary air inlet zone 3, this design can greatly reduce the impact of the mounting plate 23 on the air intake of the secondary air inlet zone 3 of the impeller, weaken the obstruction and interference of the mounting plate 23 on the secondary air inlet zone 3, increase the effective air intake area of ​​the secondary air inlet zone 3, reduce the ineffective area of ​​the secondary air inlet zone 3 of the impeller, make the air intake of the impeller root of the secondary air inlet zone 3 more sufficient, increase the flow rate of the secondary air inlet zone 3, reduce dead zones and vortex zones, and thus increase the overall flow rate and reduce noise.

[0047] Meanwhile, the mounting plate 23 is offset toward the middle area of ​​the impeller so that the center of gravity of the motor 2 and the impeller assembly is closer to the mounting plate 23, which can reduce the vibration of the rotating impeller.

[0048] like Figure 3 As shown, in this embodiment, the mounting plate 23 includes a first mounting component 231 and a second mounting component 232. The first mounting component 231 is integrally formed with the front cover 21, and the second mounting component 232 is integrally formed with the rear cover 22. The first mounting component 231 and the second mounting component 232 are provided with connecting holes, and the first mounting component 231 and the second mounting component 232 are connected by bolts passing through the connecting holes.

[0049] Specifically, both the front cover 21 and the rear cover 22 are cylindrical structures with the same diameter. The first mounting member 231 and the second mounting member 232 are annular structures with the same diameter. The first mounting member 231 and the second mounting member 232 are respectively disposed at the ends of the front cover 21 and the rear cover 22 for connection. The first mounting member 231 and the second mounting member 232 have multiple connection holes, which correspond to each other, so that the bolt assembly can be inserted into the connection holes and the first mounting member 231 and the second mounting member 232 can be connected to form a complete mounting plate 23. At the same time, when the first mounting member 231 is integrally formed with the front cover 21 and the second mounting member 232 is integrally formed with the rear cover 22, when the front cover 21 and the rear cover 22 are connected to form a complete mounting plate 23, the front cover 21 and the rear cover 22 are connected as a whole, and the rotor of the motor 2 is fixed to the cavity of the front cover 21 and the rear cover 22, forming a complete motor 2. Compared to motor 2, which has a unibody housing with openings at the ends for mounting the rotor, the rotor is easier to install.

[0050] In this embodiment, along the axial direction of the motor 2, the extension dimension of the front cover 21 is smaller than the extension dimension of the rear cover 22.

[0051] Specifically, since the first mounting component 231 is integrally formed with the front cover 21 and the second mounting component 232 is integrally formed with the rear cover 22, and the first mounting component 231 and the second mounting component 232 are connected to form a complete mounting plate 23 that is offset from the middle area of ​​the motor 2 and away from the air inlet of the secondary air inlet area 3, the extension dimension of the front cover 21 is smaller than the extension dimension of the rear cover 22 along the axial direction of the motor 2, thereby ensuring that the mounting plate 23 is set towards the impeller root of the secondary air inlet area 3, that is, offset from the middle area of ​​the motor 2.

[0052] Furthermore, in this embodiment, the extension dimension of the front cover 21 along the axial direction of the motor accounts for 0.2-0.5 of the total length of the motor 2.

[0053] Specifically, since the mounting plate 23 is located at the connection between the front cover 21 and the rear cover 22, the extension dimension of the front cover 21 is shortened and the extension dimension of the rear cover 22 is increased to ensure that the mounting plate 23 located at the connection between the front cover 21 and the rear cover 22 can be offset from the middle area of ​​the motor 2. At the same time, in order to ensure the aerodynamic performance of the secondary air intake zone 3, the proportion of the extension dimension of the front cover 21 to the total length of the motor 2 is limited to ensure that the air intake volume of the secondary air intake zone 3 is increased, dead zones and vortex zones are reduced, thereby increasing the overall flow rate and reducing noise.

[0054] In this embodiment, the thickness of the first mounting member 231 is the same as the thickness of the second mounting member 232. Compared to a situation where the thickness of the first mounting member 231 is greater than or less than the thickness of the second mounting member 232, the fact that their thicknesses are the same ensures that when the bolt assembly passes through the connecting holes of the first mounting member 231 and the second mounting member 232, the tightened bolt assembly exerts the same force on both members, thus guaranteeing the stability of the connection between the first mounting member 231 and the second mounting member 232 and preventing damage to the mounting plate 23.

[0055] like Figure 2 As shown, in this embodiment, the impeller also includes a central disk 5. The output end of the motor 2 is connected to the central disk 5, and the blade 1 is connected to the outer edge of the central disk 5. Along the axial direction of the impeller, the central disk 5 is located in the middle area of ​​the impeller, and the axis of the central disk 5 coincides with the axis of the impeller.

[0056] Specifically, the middle disk 5 has a circular structure, and its outer edge is provided with openings or slots to allow several ring-shaped blades 1 to pass through or be engaged with the middle disk 5. The axis of the middle disk 5 coincides with the output shaft of the motor 2 and the axis of the impeller, so that when the motor 2 is turned on, the output shaft rotates and drives the middle disk 5 to rotate. The blades 1 follow the rotation of the middle disk 5, thus realizing that the blades 1 are driven by the motor 2. It can be understood that the middle disk 5 is located in the middle area of ​​the impeller, that is, the middle area between the two ends of the blades 1. The impeller is divided into the main air intake area 4 and the secondary air intake area 3 by the middle disk 5. The motor 2 is located in the secondary air intake area 3, that is, the motor 2 is located on one side of the middle disk 5.

[0057] Furthermore, in this embodiment, one side of the central plate 5 is recessed corresponding to the motor 2 to form a pressing shape 51, and the recessed direction of the pressing shape 51 is away from the motor 2 and towards the main air intake area 4 of the impeller.

[0058] Specifically, the compression molding 51 is a groove that does not penetrate the central plate 5. The compression molding 51 is recessed from the central plate 5 toward the main air intake area 4 to guide the airflow from the main air intake area 4 and improve the aerodynamic performance of the impeller. In addition, the compression molding 51 is positioned to correspond to the motor 2, so as to avoid the motor 2 located in the secondary air intake area 3 and ensure sufficient installation space for the motor 2.

[0059] In this embodiment, the recess depth of the molding 51 ranges from 0 to 10 mm. Compared to molding 51 with a recess depth greater than 10 mm, such as molding 51 with a recess depth of 20 mm, this embodiment reduces the recess depth of molding 51 towards the main air intake zone 4 by limiting the recess depth of molding 51. This improves the air intake conditions of the main air intake zone 4, reduces the increase in axial wind speed caused by the small diameter of the impeller inlet, i.e., the main air intake zone 4 and the secondary air intake zone 3, slows down the impact of airflow on the central plate 5, increases the impeller flow rate, and reduces noise.

[0060] like Figure 4 As shown, this embodiment also provides a centrifugal fan, which includes the aforementioned impeller, with the mounting plate 23 of the motor 2 positioned away from the air inlet of the secondary air inlet zone 3. This reduces the influence of the mounting plate 23 on the air intake of the secondary air inlet zone 3 of the impeller, weakens the obstruction and interference of the mounting plate 23 on the secondary air inlet zone 3, increases the effective air intake area of ​​the secondary air inlet zone 3, reduces the ineffective area of ​​the secondary air inlet zone 3 of the impeller, makes the air intake at the root of the impeller in the secondary air inlet zone 3 more sufficient, increases the flow rate of the secondary air inlet zone 3, reduces dead zones and vortex zones, and thus increases the overall flow rate and reduces noise.

[0061] In addition, the centrifugal fan improves the air intake conditions of the main air intake zone 4 by limiting the depth of the compression recess 51 of the central plate 5. That is, it simultaneously improves the air intake conditions of the main air intake zone 4 and the secondary air intake zone 3, enhances the aerodynamic performance of the fan, and reduces eddies and noise caused by high air intake resistance.

[0062] This embodiment also provides a range hood that includes the aforementioned centrifugal fan. This improves the aerodynamic performance of the range hood while ensuring sufficient airflow from the centrifugal fan. Furthermore, due to the offset setting of the mounting plate 23, the intake noise is reduced. At the same time, the center of gravity is more closely aligned with the center of gravity of the impeller, reducing vibration. The range hood with this centrifugal fan is quieter during use, improving the user experience.

[0063] 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. An impeller comprising a plurality of blades arranged in a ring and a motor located at the axis of the impeller, the motor being located in the secondary air inlet area of ​​the impeller, the motor comprising a front cover, a rear cover, and a mounting plate, the mounting plate being located at the connection between the front cover and the rear cover of the motor, the mounting plate extending outward along the radial direction of the motor, characterized in that, Along the axial direction of the motor, the mounting plate is offset from the middle area of ​​the motor, and the mounting plate is positioned away from the air inlet of the secondary air inlet area of ​​the impeller.

2. The impeller as described in claim 1, characterized in that, The mounting plate includes a first mounting component and a second mounting component. The first mounting component is integrally formed with the front cover, and the second mounting component is integrally formed with the rear cover. The first mounting component and the second mounting component are provided with connecting holes, and the first mounting component and the second mounting component are connected by bolts passing through the connecting holes.

3. The impeller as described in claim 2, characterized in that, Along the axial direction of the motor, the extension dimension of the front cover is smaller than that of the rear cover.

4. The impeller as described in claim 3, characterized in that, Along the axial direction of the motor, the extension dimension of the front cover accounts for 0.2-0.5 of the total length of the motor.

5. The impeller as described in claim 2, characterized in that, The thickness of the first mounting component is the same as the thickness of the second mounting component.

6. The impeller as described in claim 1, characterized in that, The impeller also includes a central disk, the output end of the motor is connected to the central disk, the blades are connected to the outer edge of the central disk, the central disk is disposed in the middle region of the impeller along the axial direction of the impeller, and the axis of the central disk coincides with the axis of the impeller.

7. The impeller as described in claim 6, characterized in that, One side of the central plate is recessed corresponding to the motor and forms a pressed shape. The recess of the pressed shape is away from the motor and towards the main air intake area of ​​the impeller.

8. The impeller as described in claim 7, characterized in that, The depth of the indentation in the molding is in the range of 0-10mm.

9. A centrifugal fan, characterized in that, The centrifugal fan includes an impeller as described in any one of claims 1-8.

10. A range hood, characterized in that, The range hood includes the centrifugal fan as described in claim 9.

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