CN114607647B

CN114607647B - Low-noise volute fan

Info

Publication number: CN114607647B
Application number: CN202210265546.4A
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: 2022-03-17
Filing date: 2022-03-17
Publication date: 2023-04-11
Anticipated expiration: 2042-03-17
Also published as: CN114607647A

Abstract

The invention discloses a low-noise volute fan which comprises a volute and a driving assembly, wherein a boss is arranged in the volute, a volute channel with gradually increased width is arranged on the outer peripheral wall surrounding the boss, a height difference is arranged between the boss and the bottom wall of the volute channel, an air outlet channel is connected with the tail end of the volute channel, a mounting hole is axially formed in the boss, an air inlet opposite to the mounting hole is axially formed in the volute channel, the driving assembly comprises a volute blade, a motor and a floating-prevention rod, the motor is arranged in the mounting hole, the volute blade is arranged on an output shaft of the motor, the volute blade and the boss are oppositely arranged, and the floating-prevention rod stretches across the air inlet to enable the output shaft of the motor to support the floating-prevention rod. Be gradual increase formula's worm way through setting up the width to utilize and prevent that the floating rod from carrying out the top to hold the snail leaf, prevent that the snail leaf from floating from top to bottom appearing when rotating, improve the stability of snail leaf, can avoid the air current from appearing the clashing in the worm way, thereby realize effectively making an uproar falls.

Description

Low-noise volute fan

Technical Field

The invention relates to the field of fans, in particular to a low-noise volute fan.

Background

Fans are widely used as power sources for blowing, negative pressure suction and the like, for example, blowers for daily use, or dust collectors for cleaning, floor sweeping machines and the like are all provided with fans.

Along with the improvement of the living standard of people, people pursue quiet electric equipment more, therefore how to reduce the noise that the fan produced when working is the problem that technical personnel in this field faced always, however present fan is difficult to effective noise reduction because of structure, technology reason, based on above-mentioned problem, proposes the low noise spiral case fan of this application in particular.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide the low-noise volute fan capable of effectively reducing noise.

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

a low noise volute fan comprising:

the volute is internally provided with a boss, a volute channel with gradually increased width is formed in the peripheral wall surrounding the boss, a height difference is formed between the boss and the bottom wall of the volute channel, the tail end of the volute channel is connected with an air outlet channel, the boss is axially provided with a mounting hole, and the volute is axially provided with an air inlet opposite to the mounting hole; and

the driving assembly comprises a worm blade, a motor and a floating rod, the motor is arranged in the mounting hole, the worm blade is arranged on an output shaft of the motor, the worm blade and the lug boss are oppositely arranged, and the floating rod stretches across the air inlet, so that the output shaft of the motor abuts against the floating rod.

In one embodiment, the height difference between the boss and the bottom wall of the volute is 4.3-4.7 mm.

In one embodiment, the height difference between the boss and the bottom wall of the volute is 4.5mm.

In one embodiment, the volute comprises a bottom shell and a top shell, the boss is located in the bottom shell, the air inlet is located on the top shell, and the top shell and the bottom shell are buckled to form the volute channel and the air outlet channel together.

In one embodiment, the anti-floating rod and the top shell are of an integrally formed structure.

In one embodiment, a positioning groove is formed in one side, facing the boss, of the anti-floating rod, and an output shaft portion of the motor is accommodated in the positioning groove.

In one embodiment, a protrusion is disposed on an outer side wall of the bottom case, a retaining ring is disposed on an outer side wall of the top case, and when the top case is fastened with the bottom case, the protrusion is clamped in the retaining ring.

In one embodiment, the start point and the end point of the spiral channel respectively form an angle of 90 ° with a connecting line of the circle centers of the bosses.

In one embodiment, the connecting position of the worm way and the boss is provided with a smooth structure.

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

1. the anti-floating rod is arranged on the air inlet to support and fix the volute blades, so that the volute blades are prevented from floating up and down during rotation, turbulent flow is reduced, and effective noise reduction is realized;

2. set up the width for increasing formula's worm way for the air current has the posture that expands outward when the worm way flows, can make the air current more smooth and easy, reduces the air current head-on collision, thereby realizes effectively making an uproar.

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 an exploded view of a low noise volute fan according to an embodiment of the present invention;

FIG. 2 is a schematic top view of a bottom case and a boss according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a volute of an embodiment of the present invention;

FIG. 4 is a schematic view of the low noise volute fan assembly shown in FIG. 1;

FIG. 5 isbase:Sub>A schematic view of the sectional structure A-A shown in FIG. 2;

fig. 6 is a schematic structural view of a bottom case and a worm according to an embodiment of the invention.

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 4, a low noise volute fan 10 includes a volute 100 and a driving assembly 200, a boss 300 is disposed in the volute 100, a volute 110 with a gradually increasing width C is disposed on an outer circumferential wall surrounding the boss 300, a height difference D is disposed between the boss 300 and a bottom wall of the volute 110, an air outlet channel 120 is disposed at a terminal point F of the volute 110 in a connected manner, a mounting hole 310 is disposed on the boss 300 along an axial direction, and an air inlet 130 disposed opposite to the mounting hole 310 is disposed on the volute 100 along the axial direction. The driving assembly 200 includes a worm blade 210, a motor 220 and a floating-prevention rod 230, the motor 220 is disposed in the mounting hole 310, the worm blade 210 is disposed on an output shaft of the motor 220, the worm blade 210 and the boss 300 are disposed opposite to each other, and the floating-prevention rod 230 is disposed across the air inlet 130, so that the output shaft of the motor 220 supports the floating-prevention rod 230.

It should be noted that a boss 300 is disposed in the volute casing 100, wherein the boss 300 is a circular boss structure, and an axis of the boss 300 coincides with an axis of the volute casing 100. The outer side wall of the boss 300 is provided with a worm way 110. Wherein the width C of the scroll 110 is gradually increased as it goes around the outer circumference of the boss 300. For example, when the scroll casing 100 is placed right at the viewer, the width of the scroll passage 110 is gradually increased from a certain position on the outer circumference of the boss 300 in a counterclockwise direction along the boss 300, or gradually increased in a clockwise direction along the boss 300. For convenience of description, the present application is described with reference to embodiments that are gradually increased in a counterclockwise direction along the boss 300. Further, the spiral channel 110 is not completely enclosed on the outer circumferential wall of the boss 300, but is defined by a point on the outer circumferential wall of the boss 300 as a starting point and another point on the outer circumferential wall of the boss 300 as an ending point, wherein a gap is provided between the starting point and the ending point. In one embodiment, the angle G between the starting point E and the end point F of the spiral path 110 and the line connecting the centers of the circles of the bosses 300 is 90 °. Specifically, a line connecting the starting point E of the worm way 110 and the axis of the boss 300 forms a first edge, a line connecting the end point F of the worm way 110 and the axis of the boss 300 forms a second edge, and an included angle G between the first edge and the second edge is 90 °. Further, the air outlet channel 120 is disposed at the end point F of the spiral channel 110, so that the air can flow along the spiral channel 110 from the starting point E of the spiral channel 110, then pass through the end point F, and then flow out from the air outlet channel 120. Wherein, a height difference D is provided between the boss 300 and the bottom wall of the worm way 110, and the boss 300 is higher than the bottom wall of the worm way 110. Further, a mounting hole 310 is opened in a direction along the axial direction of the boss 300, wherein the motor 220 is mounted in the mounting hole 310 such that an output shaft of the motor 220 protrudes from the surface of the boss 300 into the scroll casing 100. Further, the worm blade 210 is mounted on the output shaft of the motor 220, and the motor 220 drives the worm blade 210 to rotate, wherein the worm blade 210 is aligned with the boss 300, so that the axis of the worm blade 210 coincides with the axis of the boss 300. Further, an air inlet 130 is opened at a position of the scroll casing 100 opposite to the mounting hole 310, and then the anti-floating rod 230 is mounted across the air inlet 130 so that the output shaft of the motor 220 abuts on the anti-floating rod 230.

Next, the operation principle of the low-noise volute fan 10 of the present application will be explained. When the motor 220 is powered on, the motor 220 drives the spiral blade 210 to rotate, so that the spiral blade 210 drives the air to enter the spiral blade 210 from the air inlet 130, and then the air is squeezed into the spiral channel 110 on the outer circumferential wall of the boss 300 by the spiral blade 210, so that the air flows from the starting point E to the end point F of the spiral channel 110, then flows to the air outlet channel 120, and then flows out through the air outlet channel 120. The volute 110 is of a structure with gradually increasing width, which means that the sectional area of the volute 110 gradually increases from the starting point E to the end point F, so that the volute 110 tends to be away from the center of the volute 100, and therefore, the gas can be better guided, the wind power generated by the gas is smoother, the backflow of the gas in the volute 110 is effectively reduced, the noise generated by gas flow collision and surging can be reduced, and the purpose of effectively reducing noise is achieved. Secondly, because the output shaft of motor 220 is held by preventing the floating rod 230 top, and the snail leaf 210 is fixed mounting on the output shaft of motor 220, when snail leaf 210 is driven and rotates, the air current can return to top snail leaf 210 in worm way 110, thereby make snail leaf 210 receive the trend that air thrust has toward air intake 130 motion, nevertheless withstand snail leaf 210 through preventing the floating rod 230 that sets up, can avoid snail leaf 210 to appear the problem of come-up, so, through improving the stability of snail leaf 210, avoid it to appear floating from top to bottom in the rotation process, can avoid producing the sinuous flow in the worm way 110, it produces the clash to reduce the air current, realize further making an uproar. It should be noted that the output shaft of the motor 220 is equivalent to a free end, and the anti-floating rod 230 supports against the output shaft of the motor 220, so that the output shaft of the motor 220 can effectively reduce the vibration of the output shaft when rotating at a high speed, especially when loading the volute 210, and therefore the noise generated by the vibration can be effectively eliminated, and the vibration of the volute fan 10 can also be reduced.

Referring to fig. 3, in an embodiment, a height difference D between the boss 300 and the bottom wall of the worm way 110 is 4.3mm to 4.7mm.

It should be noted that, in an embodiment, the diameter of the boss 300 is set to 61mm, and then the height difference D between the boss 300 and the bottom wall of the worm way 110 is set to 4.3mm to 4.7mm, and may also be set to 4.4mm, or 4.5mm, or 4.6mm. Therefore, when the volute 210 rotates, after the airflow enters the volute 110, the airflow can be effectively prevented from flowing back to the volute 210 to generate airflow collision. It should be noted that, by the structural cooperation that the height difference D between the boss 300 and the bottom wall of the volute 110 and the width of the volute 110 are gradually changed, the flowing effect of the airflow in the volute 110 can be effectively improved, the probability of collision of the airflow is reduced, and thus, effective noise reduction is achieved.

Referring to fig. 1 to 4, in an embodiment, the scroll casing 100 includes a bottom casing 140 and a top casing 150, the boss 300 is located in the bottom casing 140, the air inlet 130 is located on the top casing 150, and the top casing 150 and the bottom casing 140 are fastened together to form the scroll passage 110 and the air outlet passage 120.

It should be noted that the volute 100 is composed of a bottom case 140 and a top case 150, wherein the boss 300 is installed in the bottom case 140, and the axis of the boss 300 coincides with the center axis of the bottom case 140. In one embodiment, the boss 300 and the bottom case 140 are integrally formed. The air inlet 130 is located on the top casing 150, and the top casing 150 is fastened to the bottom casing 140, so that the inner sidewall of the bottom casing 140 and the inner sidewall of the top casing 150 jointly form the volute 110 and the air outlet duct 120. The volute 100 is arranged in a manner that the bottom shell 140 is buckled with the top shell 150, so that the installation of the volute 210 is facilitated.

Further, in one embodiment, the anti-floating rod 230 is integrally formed with the top case 150. Thus, the anti-floating rod 230 has sufficient structural strength, and can stably support the output shaft of the motor 220, thereby effectively avoiding the problem that the worm blade 210 floats up and down.

Referring to fig. 4, in an embodiment, a positioning groove 231 is formed on a side of the anti-floating rod 230 facing the boss 300, and an output shaft portion of the motor 220 is received in the positioning groove 231.

It should be noted that, part of the structure of the output shaft of the motor 220 is accommodated and clamped in the positioning groove 231, and the output shaft of the motor 220 is limited and fixed by the inner side wall of the positioning groove 231, so that the stability of the output shaft of the motor 220 during rotation can be improved, and the amplitude of the left-right swing of the output shaft can be reduced. Especially, the output shaft can effectively improve the rotation stability of the worm blade 210 under the condition of loading the worm blade 210, and the purpose of reducing noise is achieved by reducing vibration.

Referring to fig. 1 and 4, in an embodiment, a bump 160 is disposed on an outer side wall of the bottom case 140, a retaining ring 170 is disposed on an outer side wall of the top case 150, and when the top case 150 is fastened to the bottom case 140, the bump 160 is retained in the retaining ring 170.

It should be noted that, when the top case 150 is fastened to the bottom case 140, the protrusion 160 is fastened by the retaining ring 170, so as to fasten and fix the top case 150 to the bottom case 140, so that the top case 150 and the bottom case 140 are conveniently assembled. In one embodiment, the protrusion 160 and the bottom case 140 are integrally formed, and the retaining ring 170 and the top case 150 are also integrally formed, so that the top case 150 and the bottom case 140 are more firmly fastened. In one embodiment, the bumps 160 and the retaining rings 170 can be arranged in multiple sets as required, so that the top case 150 and the bottom case 140 can be firmly fastened together.

Referring to fig. 1, 2 and 4, in an embodiment, a locking lug 180 is further disposed on an outer side wall of the bottom case 140, a through hole 181 is formed in the locking lug 180, and a locking member such as a screw passes through the through hole 181, so that the low noise volute blower 10 can be reliably locked and fixed. In one embodiment, the locking lug 180 and the bottom case 140 are integrally formed, so as to improve the stability of the low noise volute fan 10 during locking. Further, in an embodiment, the bottom case 140, the top case 150, the protrusion 160, the retaining ring 170 and the locking lug 180 are all plastic structures, so that the total weight of the low noise volute fan 10 can be effectively reduced.

Further, referring to fig. 3, in an embodiment, a connecting position of the worm way 110 and the boss 300 is a smooth structure. That is, a smooth structure is formed between the outer sidewall of the boss 300 and the bottom wall of the scroll 110, so that when the scroll blade 210 rotates to drive the airflow into the scroll 110, the airflow can be smoother, and the collision probability of the airflow in the scroll 110 is reduced.

In one embodiment, the distance between the volute 210 and the boss 300 is 1.20mm to 1.22mm. It should be noted that, the diameter of the boss 300 is set to 61mm, when the spiral blade 210 rotates, in order to prevent the gas from flowing into between the spiral blade 210 and the boss 300, the distance between the spiral blade 210 and the boss 300 needs to be as small as possible, and at the same time, it is also ensured that the spiral blade 210 does not generate friction with the boss 300 when the spiral blade rotates at high speed, so the distance between the spiral blade 210 and the boss 300 is set to 1.20mm to 1.22mm, and in an embodiment, the distance may also be set to 1.21mm.

Referring to fig. 2 and 5, in an embodiment, a height difference H between the bottom wall of the air outlet duct 120 and the boss 300 gradually increases along a direction approaching the outlet of the air outlet duct 120.

It should be noted that, specifically, when the spiral casing 100 is horizontally disposed, the bottom wall of the air outlet channel 120 is inclined downward toward the outlet, so when the spiral vane 210 rotates to drive the gas into the spiral channel 110, the airflow flows from the starting point E to the end point F of the spiral channel 110, and then flows out from the end point F toward the outlet along the air outlet channel 120, because the bottom wall of the air outlet channel 120 is inclined toward the outlet, the air outlet of the air outlet channel 120 is expanded, the cross-sectional area of the gas flow is increased, blocking of the gas can be reduced, and therefore the phenomenon of backflow collision at the air outlet channel 120 can be avoided, so that the gas flows out smoothly, and noise is reduced. It should be noted that, because the air outlet duct 120 is of an inclined downward structure, a blocking inner wall 121 is formed between the air outlet duct 120 and the starting point E of the scroll 110 when the air outlet duct 120 passes through the starting point E of the scroll 110, and therefore, the blocking inner wall 121 can effectively block the air of the air outlet duct 120 from entering the scroll 110 again through the starting point E of the scroll 110, so as to avoid the occurrence of repeated circulation of the air flow and improve the negative pressure capability of the low-noise scroll fan 10, and the air flow of the air outlet duct 120 can be effectively prevented from generating backflow collision with the air flow at the starting point E of the scroll 110 through the blocking inner wall 121, so that effective noise reduction can be realized.

Further, in an embodiment, the air outlet channel 120 is of an increasing width structure, so that the air flows out better from the starting point E of the scroll channel 110 to the end point F of the scroll channel 110 and then from the air outlet channel 120 to the outlet, and the width is of an increasing structure, and particularly, the air outlet channel can cooperate with the blocking inner wall 121, when the air passes through the air outlet channel 120, under the blocking effect of the blocking inner wall 121, and meanwhile, because the width at the position of the starting point E of the scroll channel 110 is narrowest, the air flow can be effectively prevented from flowing into the scroll channel 110 again from the air outlet channel 120, and the air flow is prevented from being repeatedly circulated, so that the air flow flows more smoothly, the air flow backflow collision is reduced, and effective noise reduction is realized.

Referring to fig. 1, 2 and 6, in an embodiment, a shielding protrusion 240 is disposed on a side surface of the spiral blade 210 close to the boss 300, a shielding groove 320 is disposed on the boss 300, and the shielding protrusion 240 is partially received in the shielding groove 320.

It should be noted that when the worm blade 210 rotates, the shielding protrusion 240 slides in the shielding groove 320, and the shielding protrusion 240 is disposed to further prevent the gas from crossing the worm channel 110 and passing through the gap between the worm blade 210 and the boss 300. Specifically, under the condition that the distance between the volute 210 and the boss 300 is set to be 1.20 mm-1.22 mm, the shielding protrusion 240 is matched, so that the air flow can be effectively prevented from crossing and flowing through the gap between the volute 210 and the boss 300, the air flow can be prevented from colliding, and the noise reduction is achieved.

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 various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A low noise volute fan, comprising:

the volute is internally provided with a boss, a volute channel with gradually increased width is arranged on the outer circumferential wall surrounding the boss, a height difference is arranged between the boss and the bottom wall of the volute channel, the tail end of the volute channel is connected with an air outlet channel, the boss is axially provided with a mounting hole, and the volute is axially provided with an air inlet opposite to the mounting hole; and

the driving assembly comprises a worm blade, a motor and a floating-prevention rod, the motor is arranged in the mounting hole, the worm blade is arranged on an output shaft of the motor, the worm blade and the boss are oppositely arranged, and the floating-prevention rod stretches across the air inlet so that the output shaft of the motor supports against the floating-prevention rod;

the height difference between the bottom wall of the air outlet channel and the boss is gradually increased along the direction close to the outlet of the air outlet channel;

the height difference between the lug boss and the bottom wall of the volute is 4.5mm;

a positioning groove is formed in one side, facing the boss, of the anti-floating rod, and an output shaft of the motor is partially accommodated in the positioning groove;

a shielding bulge is arranged on one side surface of the worm blade close to the boss, a shielding groove is formed in the boss, and the shielding bulge is partially accommodated in the shielding groove;

the included angle between the starting point and the end point of the worm way and the connecting line of the circle centers of the bosses is 90 degrees;

the connecting position of the worm way and the lug boss is set to be a smooth structure.

2. The low noise volute blower of claim 1, wherein the volute comprises a bottom shell and a top shell, the boss is located in the bottom shell, the air inlet is located in the top shell, and the top shell and the bottom shell are engaged to form the volute channel and the air outlet channel together.

3. The low noise volute blower of claim 2, wherein the anti-float rod is integrally formed with the top housing.

4. The low noise volute blower of claim 2, wherein a protrusion is disposed on an outer sidewall of the bottom casing, a retaining ring is disposed on an outer sidewall of the top casing, and the protrusion is engaged with the retaining ring when the top casing is engaged with the bottom casing.