CN220378539U - Impeller and centrifugal fan - Google Patents

Abstract

The utility model belongs to the technical field of air supply equipment, and discloses an impeller and a centrifugal fan. The impeller includes a front disk, a rear disk, a plurality of first blades, and a plurality of second blades. The rear disc is arranged opposite to the front disc; the plurality of first blades are arranged between the front disc and the rear disc and are distributed around the circumference of the rear disc at intervals, an accelerating flow channel is formed between two adjacent first blades, the accelerating flow channel is provided with a first side and a second side which are opposite, gas flows from the first side to the second side, and the sectional area of the first side is larger than that of the second side; the plurality of second blades are annularly arranged on the outer sides of the plurality of first blades, and a uniform-speed flow passage communicated with the second side is formed between two adjacent second blades. This centrifugal fan with this impeller is when using, and gaseous can flow after passing through acceleration flow channel and uniform velocity runner in proper order for gaseous can flow with higher and stable velocity of flow, has reduced the possibility that appears vortex and low-speed vortex, ensures the pneumatic performance of fan, and the intensity of noise reduction effectively improves user's experience and feel.

Description

Impeller and centrifugal fan

Technical Field

The utility model relates to the technical field of air supply equipment, in particular to an impeller and a centrifugal fan.

Background

The centrifugal fan is an important air supply device and is commonly used in products such as a range hood and the like for sucking oil smoke.

In the prior art, the impeller is generally composed of a plurality of blades, a front cover, a rear cover and other parts, the blades are arranged in a plurality of ways and distributed at intervals along the circumferential direction, the section of the blades is in a whole-section arc shape, and a flow channel for gas flow is formed between two adjacent blades.

When the gas flows in the flow channel, part of the gas can be adsorbed on the surface of the blade, and because the gas flows in the boundary layer and has a speed gradient, the closer the gas flows to the surface of the blade, the larger the gas flow speed is affected by viscosity, when the kinetic energy of the gas in the boundary layer can not overcome the friction force of the surface of the blade, vortex or low-speed vortex can be formed, and the vortex or low-speed vortex radiates energy in the form of noise, so that the aerodynamic performance of a fan is affected, and the experience of a user is poor because the noise is too large.

Disclosure of Invention

The utility model aims to provide an impeller and a centrifugal fan, which solve the problems that in the prior art, vortex or low-speed vortex areas are easy to generate when the impeller is used, so that the aerodynamic performance of the fan is poor, and the experience of a user is poor due to overlarge noise.

To achieve the purpose, the utility model adopts the following technical scheme:

in a first aspect, the present utility model provides an impeller comprising:

a front plate;

the rear disc is arranged opposite to the front disc;

the first blades are arranged between the front disc and the rear disc and are distributed around the circumference of the rear disc at intervals, an accelerating flow channel is formed between two adjacent first blades, the accelerating flow channel is provided with a first side and a second side which are opposite, gas flows from the first side to the second side, and the sectional area of the first side is larger than that of the second side; and

the second blades are annularly arranged on the outer sides of the first blades, and a uniform-speed flow passage communicated with the second side is formed between two adjacent second blades.

Optionally, the first blade has an arc-shaped cross section, and the arc of the first side is greater than the arc of the second side.

Optionally, the angle between the first side and the second side is greater than 90 degrees.

Optionally, the second blade is arcuate.

Optionally, the plurality of first blades and the plurality of second blades are staggered along the circumferential direction of the rear disc, so that the second blades correspond to the second side of the acceleration flow channel and divide the second side into an air outlet and an air outlet gap.

Optionally, the angle of the air outlet gap is between 3 ° and 7 °.

Optionally, the air outlet gap is disposed near a convex side of the second blade.

Optionally, the first blade is greater in height than the second blade.

Optionally, the front tray includes:

the first annular disk and the second annular disk, the interval of first annular disk and back dish is greater than the interval of second annular disk and back dish, and first blade is located between first annular disk and the back dish, and the second blade is located between second annular disk and the back dish.

In a second aspect, the present utility model also provides a centrifugal fan comprising:

a volute; and

an impeller according to any one of the first aspects, provided to a volute.

The utility model has the beneficial effects that:

according to the first aspect, the first blades and the second blades which are distributed in two sections are arranged between the front disc and the rear disc so as to correspondingly form the accelerating flow channel and flow at a uniform speed, so that gas can enter the accelerating flow channel when flowing, when flowing from the first side to the second side, the flow velocity of the gas can be increased due to smaller sectional area of the second side, the possibility of vortex flow of the gas in the flowing process is effectively reduced, and after the gas is accelerated by the accelerating flow channel, the gas can flow into the uniform flow channel through the second side stably and flows out at a higher and stable flow velocity, and the possibility of low-speed vortex region of the gas is effectively reduced. Therefore, when the impeller is used, the possibility of occurrence of vortex and low-speed vortex area is reduced, and the noise intensity can be reduced while the gas flow efficiency is ensured.

In the second aspect, the gas can flow out after sequentially passing through the acceleration flow channel and the constant-speed flow channel when the centrifugal fan is used, so that the gas can flow at a higher and stable flow speed, the possibility of vortex and low-speed vortex area is reduced, the aerodynamic performance of the fan is ensured, the noise intensity is reduced, and the experience of a user is effectively improved.

Drawings

FIG. 1 is a schematic view of an impeller according to a first embodiment of the present utility model;

FIG. 2 is a top view of an impeller in accordance with a first embodiment of the present utility model;

FIG. 3 is an enlarged view of a part of the structure of an impeller in accordance with the first embodiment of the present utility model;

FIG. 4 is a top view of an impeller according to a second embodiment of the present utility model;

fig. 5 is a perspective view of an impeller in a second embodiment of the present utility model.

In the figure:

1. a front plate; 11. a first annular disk; 12. a second annular disk; 2. a rear tray; 3. a first blade; 31. acceleration flow path; 311. a first side; 312. a second side; 3121. an air outlet; 3122. an air outlet gap; 4. a second blade; 41. a uniform velocity runner; 5. a middle plate.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The utility model provides an impeller and a centrifugal fan.

Example 1

Referring to fig. 1 to 3, the impeller includes a front disc 1, a rear disc 2, a plurality of first blades 3, and a plurality of second blades 4. The rear disc 2 is arranged opposite to the front disc 1; the plurality of first blades 3 are arranged between the front disc 1 and the rear disc 2 and are distributed around the circumference of the rear disc 2 at intervals, an accelerating flow channel 31 is formed between two adjacent first blades 3, the accelerating flow channel 31 is provided with a first side 311 and a second side 312 which are opposite, and gas flows from the first side 311 to the second side 312, and the sectional area of the first side 311 is larger than that of the second side 312; the plurality of second blades 4 are annularly arranged outside the plurality of first blades 3, and a uniform velocity runner 41 communicated with the second side 312 is formed between two adjacent second blades 4.

Specifically, the front disc 1 and the rear disc 2 are both annular, the front disc 1 and the rear disc 2 are coaxially arranged, a frustum-shaped middle disc 5 is arranged in the middle of the rear disc 2, and the rear disc 2 is fixed on the lower side of the middle disc 5. The first blade 3 and the second blade 4 are long, the lower ends of the first blade and the second blade are connected with the rear disc 2, and the upper ends of the first blade and the second blade are connected with the front disc 1. The plurality of first blades 3 are annularly arranged at the inner side of the front disc 1, and the distance between two adjacent first blades 3 can be reduced or suddenly changed, so that in the cross section of the acceleration flow channel 31 (the cross section perpendicular to the impeller axis is the cross section), the cross section of the second side 312 is smaller than the cross section of the first side 311, the first side 311 is the gas inlet for the gas entering the acceleration flow channel 31, and the second side 312 is communicated with the uniform velocity flow channel 41.

The uniform velocity runner 41 is formed by two adjacent second blades 4, and a plurality of second blades 4 are arranged on the outer side of the front disc 1 in a spacing way and distributed around the circumference of a plurality of first blades 3, and in the cross section of the uniform velocity runner 41, the cross section area is kept unchanged, so that the gas can flow at a stable speed. The first blade 3 and the second blade 4 may be made of materials with higher smoothness, or the surfaces of the first blade 3 and the second blade 4 are coated with coatings such as smooth films, so that friction force between the gas and the first blade 3 and the second blade 4 in the flowing process is as small as possible, and the materials of the first blade 3, the second blade 4 and the smooth films may be designed according to actual processing and application conditions.

Through setting up two segmentation distribution's first blade 3 and second blade 4 between front tray 1 and rear tray 2 to correspond formation acceleration flow channel 31 and uniform velocity runner 41, make gas when flowing, can advance acceleration flow channel 31, when gas flows from first side 311 to second side 312, because the sectional area of second side 312 is littleer, make the velocity of flow of gas will increase, thereby effectively reduce the possibility that gas appears the vortex in the flow process, and gas after the acceleration of acceleration flow channel 31, can stabilize and flow into uniform velocity runner 41 through second side 312, and flow out uniform velocity runner 41 at higher and steady velocity of flow, effectively reduce the possibility that gas appears low-speed vortex. Therefore, when the impeller is used, the possibility of occurrence of vortex and low-speed vortex area is reduced, and the noise intensity can be reduced while the gas flow efficiency is ensured.

Referring to fig. 3, alternatively, the first blade 3 may have an arcuate cross-section with the first side 311 having a greater curvature than the second side 312.

Specifically, one side of the first vane 3 is concave, and the other side is convex, so that the cross section of the first vane 3 is arc-shaped, the radian of the first side 311 is larger, the first side 311 of the first vane 3 is higher in bending, the sectional area of the first side 311 of the acceleration flow channel 31 is larger, the radian of the second side 312 is smaller, the second side 312 of the first vane 3 is straighter, the distance between the second sides 312 of two adjacent first vanes 3 is smaller, and the sectional area of the second side 312 is smaller. The included angle between the first side 311 and the second side 312 is greater than 90 degrees, so that the first blade 3 is kept to be bent integrally, and the accelerating flow channel 31 with the sectional area decreasing from the first side 311 to the second side 312 is formed.

By designing the first vane 3 to be arc-shaped to correspondingly form the accelerating flow channel 31 with decreasing sectional area, when the gas flows into the accelerating flow channel 31, the flow velocity of the gas can gradually increase along with the decreasing sectional area, when the gas flows from the first side 311 to the second side 312, the gas can flow out at a higher flow velocity and enter the uniform flow channel 41, and because the stability of the gas at the higher flow velocity is better, the gas can smoothly pass over the first vane 3 and the second vane 4 distributed in two sections, and the gas flowing at a high speed can not form a low-speed vortex region to generate noise.

Referring to fig. 3, the second blade 4 may alternatively be curved. The plurality of first blades 3 and the plurality of second blades 4 are distributed in a staggered manner along the circumferential direction of the rear disc 2, so that the second blades 4 correspond to the second side 312 of the acceleration flow path 31 and partition the second side 312 into the air outlet 3121 and the air outlet gap 3122. The angle of the air outlet gap 3122 is between 3 ° and 7 °. The air outlet gap 3122 is provided near the convex side of the second blade 4.

Specifically, the sections of the second blades 4 are arc-shaped, and the radian of the arc-shaped sections is kept consistent, so that the distance between two adjacent second blades 4 is kept the same, a uniform-speed flow channel 41 with a constant sectional area is formed, and the accelerated gas can flow at a high and stable flow rate. The first blades 3 and the second blades 4 are staggered, so that the air outlets 3121 of the second side 312 can be communicated with the corresponding uniform velocity channels 41, and the air outlet gaps 3122 are communicated with the adjacent uniform velocity channels 41. The angle of the air outlet gap 3122 may be set to be β, and β is 3 ° or more and 7 ° or less, and the specific β may be designed according to the relative positional relationship between the actual acceleration flow path 31 and the constant velocity flow path 41, which is not particularly limited in the present utility model.

By forming the air outlet 3121 and the air outlet gap 3122, a part of the air accelerated by the acceleration flow channel 31 can enter the corresponding constant speed flow channel 41 through the air outlet 3121, and another part of the air enters the adjacent constant speed flow channel 41 through the air outlet gap 3122, and the air flowing out through the air outlet gap 3122 can directly contact with the convex surface of the second blade 4 due to the approach of the air outlet gap 3122 to the convex surface of the second blade 4, and flow out at a constant speed under the guidance of the convex surface of the second blade 4, thereby effectively reducing the area of the vortex in the constant speed flow channel 41.

The centrifugal fan comprises a volute and an impeller as described above. The impeller is arranged on the volute.

This centrifugal fan can flow through acceleration flow channel 31 and at the uniform velocity flow channel 41 back again in proper order when using for the gas can flow with higher and stable velocity of flow, has reduced the possibility that appears vortex and low-speed vortex, ensures the aerodynamic performance of fan, and the intensity of noise reduction effectively improves user's experience and feel.

Example two

The present embodiment differs from the first embodiment in that the first blade 3 and the second blade 4 are different in height on the basis of the first embodiment.

Referring to fig. 4 and 5, alternatively, the first blade 3 has a height greater than the second blade 4.

Specifically, the front plate 1 includes a first annular plate 11 and a second annular plate 12. The distance between the first annular disc 11 and the rear disc 2 is larger than the distance between the second annular disc 12 and the rear disc 2, the first blades 3 are located between the first annular disc 11 and the rear disc 2, the second blades 4 are located between the second annular disc 12 and the rear disc 2, and the specific height difference between the first annular disc 11 and the second annular disc 12 can be designed according to the actual installation space and the running performance, which is not particularly limited in the utility model.

Through taking the rear disc 2 as a reference, a first annular disc 11 and a second annular disc 12 with different heights are arranged, and then a first blade 3 and a second blade 4 with different heights are correspondingly arranged, so that the area forming a low-speed area is reduced on the inner side of the whole impeller, the possibility of occurrence of a low-speed vortex area is further reduced, and the possibility of occurrence of noise is reduced in benefit.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. An impeller, comprising:

a front plate (1);

a rear disc (2) arranged opposite to the front disc (1);

a plurality of first blades (3) arranged between the front disc (1) and the rear disc (2) and distributed at intervals around the circumference of the rear disc (2), wherein an accelerating flow channel (31) is formed between two adjacent first blades (3), the accelerating flow channel (31) is provided with a first side (311) and a second side (312) which are opposite, and gas flows from the first side (311) to the second side (312), and the sectional area of the first side (311) is larger than that of the second side (312); and

and the plurality of second blades (4) are annularly arranged outside the plurality of first blades (3), and uniform speed flow passages (41) communicated with the second sides (312) are formed between two adjacent second blades (4).

2. The impeller according to claim 1, characterized in that the first blade (3) has an arc-shaped cross section and the first side (311) has a greater curvature than the second side (312).

3. The impeller of claim 2, wherein the angle between the first side (311) and the second side (312) is greater than 90 degrees.

4. -impeller according to any one of claims 1 to 3, characterised in that the second blades (4) are curved.

5. The impeller according to claim 4, characterized in that a plurality of the first blades (3) and a plurality of the second blades (4) are distributed with a displacement in the circumferential direction of the rear disc (2) such that the second blades (4) correspond to the second side (312) of the acceleration flow channel (31) and divide the second side (312) into an air outlet (3121) and an air outlet gap (3122).

6. Impeller according to claim 5, characterized in that the angle of the air outlet gap (3122) is between 3 ° and 7 °.

7. Impeller according to claim 6, characterized in that the air outlet gap (3122) is arranged close to the convex side of the second blade (4).

8. -impeller according to any one of claims 1 to 3, characterised in that the height of the first blades (3) is greater than the second blades (4).

9. Impeller according to claim 8, characterized in that the front disc (1) comprises:

first ring dish (11) and second ring dish (12), first ring dish (11) with the interval of back dish (2) is greater than second ring dish (12) with the interval of back dish (2), first blade (3) are located between first ring dish (11) and back dish (2), second blade (4) are located between second ring dish (12) with back dish (2).

10. Centrifugal fan, its characterized in that includes:

a volute; and

an impeller according to any one of claims 1 to 9, provided to the volute.