CN114607624A

CN114607624A - Volute centrifugal fan

Info

Publication number: CN114607624A
Application number: CN202210259946.4A
Authority: CN
Inventors: 雷希强; 张全义; 先宇; 王观武; 骆国辉; 刘光辉
Original assignee: Huizhou Aimeijia Magnetoelectric Technology Co ltd
Current assignee: Huizhou Aimeijia Magnetoelectric Technology Co ltd
Priority date: 2022-03-16
Filing date: 2022-03-16
Publication date: 2022-06-10

Abstract

The volute centrifugal fan comprises a volute and a negative pressure assembly, wherein a negative pressure cavity, an air inlet and an air outlet which are respectively communicated with the negative pressure cavity are formed in the volute, the negative pressure assembly comprises a rotating motor and an impeller, the rotating motor is arranged on the volute, the impeller is arranged on an output shaft of the rotating motor, the impeller and the air inlet are arranged in opposite directions, a plurality of blades which are distributed circumferentially are arranged on the impeller, an air channel is formed between any two adjacent blades, the width of the air channel is gradually increased towards the direction far away from the axis of the impeller, and when the rotating motor is used for driving the impeller to rotate, air flows into the negative pressure cavity through the air inlet and the air channel in sequence and then flows out through the air outlet. Through setting up the sectional area in wind channel to the structure of the direction subassembly increase of keeping away from the impeller axle center, when the impeller rotated, can form enough big negative pressure in the wind channel to can produce sufficient suction when making being applied to the machine of sweeping the floor.

Description

Volute centrifugal fan

Technical Field

The invention relates to the field of centrifugal fans, in particular to a volute centrifugal fan.

Background

Centrifugal ventilators are machines that increase the pressure of a gas by mechanical energy and then convey the gas away. The negative pressure is formed in the fan by means of rotation of the impeller, so that external gas is sucked in and is discharged after being pressurized by the impeller flow channel and the volute.

The fan is widely applied to various fields such as energy, environment, aviation, home furnishing and the like, for example, sweeping robots with increasingly vigorous demands utilize the fan to generate negative pressure so as to absorb the chippings and dust on the ground. The negative pressure intensity of the fan is generally proportional to the volume of the fan, so that the larger the suction force of the sweeper is, the larger the volume of the fan is required to be correspondingly used. However, the volume of the sweeper cannot be infinitely enlarged, otherwise, larger noise is generated, and the characteristics of compactness and flexibility are lost, so that the technical problem to be solved by a person skilled in the art is to design a high negative pressure centrifugal fan applied to the sweeper on the premise of limiting the volume.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a volute centrifugal fan which is applied to a sweeper and can generate high negative pressure.

The purpose of the invention is realized by the following technical scheme:

a volute centrifugal fan comprising:

the volute is provided with a negative pressure cavity, and an air inlet hole and an air outlet hole which are respectively communicated with the negative pressure cavity; and

the negative pressure assembly comprises a rotating motor and an impeller, the rotating motor is arranged on the volute, the impeller is arranged on an output shaft of the rotating motor and is arranged opposite to the air inlet hole, a plurality of blades distributed circumferentially are arranged on the impeller, so that an air channel is formed between any two adjacent blades, and the width of the air channel is gradually increased towards the direction away from the axis of the impeller;

when the rotating motor is used for driving the impeller to rotate, the gas flows into the negative pressure cavity through the air inlet and the air channel in sequence and then flows out through the air outlet.

In one embodiment, the impeller includes a bottom plate and a top cover, and each of the blades is disposed between the bottom plate and the top cover, so that the side surface of the bottom plate, the side surface of the top cover, and the side surfaces of the blades together enclose the air duct.

In one embodiment, one end of each blade is arranged in an arc-shaped structure towards the other end far away from the axle center of the bottom plate.

In one embodiment, the inlet angle of the vanes is 38 ° to 42 °.

In one embodiment, the exit angle of the vanes is 58 ° to 62 °.

In one embodiment, the thickness of the blade is 0.5 mm-0.9 mm.

In one embodiment, the blades are provided in ten rows, and the blades are arranged equidistantly.

In one embodiment, the included angle between the side surface of the blade close to the axial center of the bottom plate and the surface of the bottom plate is 64-68 degrees.

In one embodiment, a rounded portion is provided at one end of the blade close to the axial center of the base plate.

In one embodiment, the top cover is provided with air inlets, each air duct is communicated with the air inlets, and the air inlets are oppositely arranged

Compared with the prior art, the invention has at least the following advantages:

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of a volute centrifugal fan according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an impeller according to an embodiment of the present invention;

FIG. 3 is a schematic view of a portion of the impeller shown in FIG. 2;

FIG. 4 is a schematic structural view of a blade according to an embodiment of the present invention;

fig. 5 is a partial sectional structural view of the impeller shown in fig. 2.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings.

Referring to fig. 1 to 3, a volute centrifugal fan 10 includes a volute 100 and a negative pressure assembly 200, the volute 100 is provided with a negative pressure cavity 110, and an air inlet 120 and an air outlet 130 respectively communicated with the negative pressure cavity 110, the negative pressure assembly 200 includes a rotating motor 210 and an impeller 220, the rotating motor 210 is disposed on the volute 100, the impeller 220 is disposed on an output shaft of the rotating motor 210, the impeller 220 and the air inlet 120 are disposed in opposite directions, the impeller 220 is provided with a plurality of circumferentially distributed blades 221, so that an air duct 222 is formed between any two adjacent blades 221, a width D of the air duct 222 gradually increases in a direction away from an axis of the impeller 220, and when the rotating motor 210 is used to drive the impeller 220 to rotate, the air flows into the negative pressure cavity 110 through the air inlet 120 and the air duct 222 in sequence, and then flows out through the air outlet 130.

It should be noted that the negative pressure assembly 200 is installed in the negative pressure chamber 110 of the volute 100, and the negative pressure assembly 200 is used for pressing the air outside the volute 100 into the negative pressure chamber 110 through the air inlet hole and then discharging the air through the air outlet hole 130. In one embodiment, the air inlet holes 120 are circular holes. Further, the intake hole 120 is located on an axially outer side wall of the scroll casing 100, and the exhaust hole 130 is located on a radially outer side wall of the scroll casing 100. The negative pressure assembly 200 includes a rotating motor 210 and an impeller 220, the rotating motor 210 is fixedly installed on the volute 100, wherein an output shaft of the rotating motor 210 is disposed toward the air inlet 120, and a central axis of the output shaft of the rotating motor 210 coincides with a central axis of the air inlet 120. The impeller 220 is installed on an output shaft of the rotation motor 210, so that the impeller 220 is located in the negative pressure chamber 110, and thus, the rotation motor 210 drives the impeller 220 to rotate, so that the impeller 220 can press the gas outside the scroll casing 100 into the negative pressure chamber 110, and then discharge the gas from the gas discharge hole 130. Specifically, the impeller 220 is mounted with a plurality of blades 221, wherein each blade 221 is circumferentially distributed on the impeller 220, that is, each blade 221 is circumferentially distributed around a central axis of the impeller 220. Wherein any two adjacent blades 221 are disposed equidistantly therebetween. So that an air duct 222 is formed between every two adjacent blades 221, wherein the width D of the air duct 222 gradually increases toward a direction away from the central axis of the impeller 220, so that when the impeller 220 rotates, the blades 221 press the air in the air duct 222 into the negative pressure chamber 110, so that a negative pressure is formed in the air duct 222, and further the air outside the scroll casing 100 is introduced into the air duct 222 through the air inlet hole 120, then pressed into the negative pressure chamber 110, and finally discharged from the air outlet hole 130. Thus, the blades 221 are arranged in a scattering structure, so that the working negative pressure of the blades can be effectively improved, sufficient suction can be generated when the blades are applied to a sweeper, the structure is compact, and the characteristics of small size can be achieved.

Referring to fig. 1 to 3, in an embodiment, the impeller 220 includes a bottom plate 223 and a top cover 224, and each of the blades 221 is disposed between the bottom plate 223 and the top cover 224, so that the side surface of the bottom plate 223, the side surface of the top cover 224, and the side surface of the blade 221 together form an air channel 222.

It should be noted that the impeller 220 is composed of a bottom plate 223, a top cover 224 and a plurality of blades 221, wherein a gap is provided between the bottom plate 223 and the top cover 224, and each blade 221 is installed between the bottom plate 223 and the top cover 224, so that the upper and lower ends of any blade 221 are fixedly connected with the bottom plate 223 and the top cover 224, and thus, the inner side walls of every two adjacent blades 221, the upper side surface of the bottom plate 223 and the lower side surface of the top cover 224 jointly enclose the air duct 222. Thus, when the impeller 220 rotates, the air is forced into the negative pressure chamber 110 through the air passages 222. It should be noted that the air duct 222 is only a tubular structure with two ends connected, so that when the impeller 220 rotates, the air duct 222 forms a sufficient negative pressure, and when the air duct is applied to a sweeper, a sufficient suction force can be generated.

Referring to fig. 2 and 3, in an embodiment, one end of the vane 221 is disposed in an arc shape toward the other end away from the axial center of the bottom plate 223.

The bottom plate 223 and the top cover 224 are both configured to have a circular structure. Therefore, the blade 221 is configured to have a certain curvature between its two ends along the radial direction of the bottom plate 223 and in the direction away from the axial center of the bottom plate 223. In this way, when the impeller 220 rotates, the air in the air duct 222 can better flow into the negative pressure chamber 110 along the side wall of the cambered vane 221, so that sufficient negative pressure is formed in the air duct 222, and the suction force is increased.

Referring to fig. 3, in an embodiment, the inlet angle E of the blade 221 is 38 ° to 42 °, and the outlet angle F of the blade 221 is 58 ° to 62 °.

It should be noted that, the blades 221 are arranged in a cambered structure, so that one end of each blade 221 is in an outward scattering structure toward the other end away from the central axis, and therefore, an included angle between the end of each blade 221 close to the central axis and the circle, that is, the inlet angle E, is 38 ° to 42 °, for example, the inlet angle E may also be 39 °, or 40 °, or 41 °. And the end of the vane 221 remote from the central axis is angled from the circle, i.e. the exit angle F is 58 ° to 62 °, for example, the exit angle F may also be 59 °, or 60 °, or 61 °. In this way, by arranging the blades 221 to have a cambered structure, the formed air duct 222 can be in a cambered structure, and therefore, when the impeller 220 rotates, the gas in the air duct 222 can be better pressed into the negative pressure cavity 110, so that sufficient negative pressure is formed in the air duct 222.

Referring to fig. 2, in an embodiment, the thickness G of the blade 221 is 0.5mm to 0.9 mm. It should be noted that, in an embodiment, the diameter of the bottom plate 223 is 44mm, and the thickness G of the blades 221 is set to 0.5mm to 0.9mm, for example, it may also be set to 0.6mm, or 0.7mm, or 0.8mm, so that the air channels 222 with a proper ratio are formed between the blades 221, and at the same time, the blades 221 have sufficient structural strength, and the weight of the impeller 220 due to the excessive thickness of the blades 221 is avoided.

In one embodiment, the blades 221 are ten, and the blades 221 are arranged at equal intervals. In this way, ten air channels 222 are correspondingly formed, so that the impeller 220 can generate enough negative pressure, and thus, enough suction force can be generated when the vacuum cleaner is applied to a sweeper.

Referring to fig. 4, in an embodiment, an included angle H between a side surface of the blade 221 near the axis of the bottom plate 223 and the surface of the bottom plate 223 is 64 ° to 68 °.

It should be noted that, one side of the vane 221 close to the axial center of the bottom plate 223 is arranged in an inclined structure, so that an included angle H between the vane 221 and the surface of the bottom plate 223 is 64 °, or 65 °, or 66 °, or 67 °, and thus, when the impeller 220 rotates, gas outside the volute 100 can better enter the air duct 222.

Referring to fig. 2, in one embodiment, a rounded portion 221a is disposed at an end of the blade 221 near the axial center of the bottom plate 223. It should be noted that, the end of the vane 221 close to the axial center of the bottom plate 223 is close to the inlet of the air inlet duct 222, and the rounded portion 221a can reduce the resistance to the air, so that the air can better enter the air inlet duct 222.

Referring to fig. 1 and 2, in an embodiment, the top cover 224 is provided with air inlets 224a, each air duct 222 is communicated with the air inlets 224a, and the air inlets 224a are disposed opposite to the air inlets 120.

It should be noted that, the top cover 224 is a circular structure, the air inlet holes 224a are disposed at the center of the top cover 224, so that the central axes of the air inlet holes 224a coincide with the central axis of the top cover 224, and the air channels 222 are respectively distributed around the air inlet holes 224a, so that the air outside the scroll casing 100 is uniformly distributed into the air channels 222 when flowing through the air inlet holes 224a through the air inlet holes 120, thereby effectively increasing the flow rate of the air.

Referring to fig. 5, in an embodiment, the height I of the air duct 222 gradually decreases away from the central axis of the bottom plate 223. It should be noted that the top cover 224 is configured to be concave toward the bottom plate 223, so that the height I of the formed air channel 222 is configured to be gradually decreased, and thus, the negative pressure formed in the impeller 220 can be increased by changing the sectional area of the air channel 222 to change the flow rate of the air in the air channel 222.

Referring to fig. 1, 2, 3 and 5, in an embodiment, a conical boss 225 is disposed on a side surface of the bottom plate 223 close to the top cover 224, and the conical boss 225 is disposed opposite to the air inlet 224 a. It should be noted that, the height of circular cone boss 225 increases progressively towards the direction of the axis that is close to bottom plate 223 to make the surface of circular cone boss 225 have certain radian, so, when gas gets into in bottom plate 223 and top cap 224 from gas inlet 224a, circular cone boss 225's arc surface can be to each wind channel 222 of gas direction in, so, make the gas flow more smooth and easy, thereby can reduce wind and make an uproar, and through setting up circular cone boss 225 in bottom plate 223's central point department, the output shaft of rotating motor 210 passes bottom plate 223 and circular cone boss 225 in proper order and fixes, can strengthen bottom plate 223's structural strength.

Referring to fig. 1, in one embodiment, a plurality of fixing lugs 300 are disposed on an outer side wall of the volute 100. It should be noted that, by installing a plurality of fixing lugs 300, the volute centrifugal fan 10 can be conveniently locked and fixed. In one embodiment, three fixing ears 300 are provided. Further, in an embodiment, the fixing lug 300 is provided with a fixing groove 310, and the fixing groove 310 is an opening groove structure, so that the fixing groove 310 can be applied to a screw locking fixing mode and a fastening fixing mode, and the volute centrifugal fan 10 can be fixed more flexibly.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A volute centrifugal fan, comprising:

the negative pressure assembly comprises a rotating motor and an impeller, the rotating motor is arranged on the volute, the impeller is arranged on an output shaft of the rotating motor, the impeller and the air inlet are oppositely arranged, a plurality of blades distributed circumferentially are arranged on the impeller, so that an air channel is formed between any two adjacent blades, and the width of the air channel is gradually increased towards the direction far away from the axis of the impeller;

and the rotating motor is used for driving the impeller to rotate, so that gas flows into the negative pressure cavity through the air inlet and the air duct in sequence and flows out through the exhaust hole.

2. The volute centrifugal fan of claim 1, wherein the impeller comprises a base plate and a top cover, and each of the blades is disposed between the base plate and the top cover, such that the side surfaces of the base plate, the top cover, and the blades collectively define the air channel.

3. The volute centrifugal fan of claim 2, wherein the vanes are disposed in an arcuate configuration between one end and the other end away from the axial center of the base plate.

4. The volute centrifugal fan of claim 3, wherein the inlet angle of the blades is 38 ° to 42 °.

5. The volute centrifugal fan of claim 3 or 4, wherein the outlet angle of the blades is between 58 ° and 62 °.

6. The volute centrifugal fan of claim 1 or 3, wherein the blades have a thickness of 0.5mm to 0.9 mm.

7. The volute centrifugal fan of claim 1, wherein the blades are ten, and wherein the blades are equally spaced.

8. The volute centrifugal fan of claim 2, wherein the angle between the side of the vane adjacent the axial center of the base plate and the surface of the base plate is between 64 ° and 68 °.

9. The volute centrifugal fan of claim 2 or 8, wherein the blades have a rounded portion at an end proximate to the axial center of the base plate.

10. The volute centrifugal fan of claim 2, wherein the top cover is provided with air inlets, each air channel is communicated with the air inlets, and the air inlets are opposite to the air inlets.