CN216951016U

CN216951016U - Noise reduction structure of micro fan

Info

Publication number: CN216951016U
Application number: CN202122815323.4U
Authority: CN
Inventors: 张振建; 郭瑞; 刘�东
Original assignee: Shenzhen Cangxingda Technology Co ltd
Current assignee: Shenzhen Cangxingda Technology Co ltd
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2022-07-12
Anticipated expiration: 2031-11-17

Abstract

The utility model discloses a noise reduction structure of a micro fan, which comprises a shell, wherein an air inlet is formed in the shell, an impeller is installed in the shell, the impeller is close to the air inlet, a backflow gap is formed between the impeller and the shell, a noise reduction assembly is arranged in the backflow gap, and the noise reduction assembly achieves the purpose of noise reduction by reducing the size of the backflow gap.

Description

Noise reduction structure of micro fan

Technical Field

The utility model relates to the technical field of fans, in particular to a noise reduction structure of a micro fan.

Background

In modern clinical medicine, a ventilator has been widely used in respiratory failure due to various reasons, anesthesia and breathing management during major surgery, respiratory support therapy and emergency resuscitation as an effective means for manually replacing the function of spontaneous ventilation, and has a very important position in the modern medical field. The breathing machine is a vital medical device which can prevent and treat respiratory failure, reduce complications and save and prolong the life of a patient.

Thanks to the rapid development of modern medical technology, ventilators are becoming more and more common in home applications, and a turbofan is a key part of a ventilator, so that the technical content is high and the production difficulty is high. The noise of domestic breathing machine size can influence family member's sleep quality, and its technique of making an uproar of falling of original fan has slowly can not satisfy present market demand. In order to ensure smooth operation of the impeller, a certain gap is generally formed between the fan and the impeller, so that part of the wind flows back through the gap, and the wind strikes the surface of the impeller or the inner wall of the casing in the process of flowing back to increase the noise, and therefore, the development of a fan with low noise is needed.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a noise reduction structure for a micro fan, which can reduce fan noise.

The technical scheme is as follows: the utility model provides a structure of making an uproar falls in micro-fan, includes the casing, seted up the air intake on the casing, its key lies in: the impeller is installed in the shell and is close to the air inlet, a backflow gap is formed between the impeller and the shell, a noise reduction assembly is arranged in the backflow gap, and the noise reduction assembly achieves the purpose of noise reduction by reducing the size of the backflow gap. By adopting the technical scheme, the noise reduction assembly leads to the increase of the wind resistance of the backflow wind by reducing the size of the backflow gap, the backflow wind volume is reduced, the flow speed is reduced, and thus the noise is reduced.

Further, the air conditioner is provided with a fan,

the noise reduction assembly comprises at least one first noise reduction protruding strip which is annular and surrounds the air inlet. By adopting the structure, the first noise reduction raised line forms a structure similar to a wind shielding wall on the backflow path of backflow wind, so that the backflow wind resistance is increased.

The noise reduction assembly further comprises a second noise reduction convex strip in a circular ring shape and a circular noise reduction groove, the second noise reduction convex strip or the noise reduction groove is located on the impeller, the other noise reduction convex strip is located on the inner wall of the shell, the second noise reduction convex strip surrounds the periphery of the air inlet, and the second noise reduction convex strip penetrates through the backflow gap and then enters the noise reduction groove. By adopting the structure, the reflowing wind can continue to reflow after bypassing the second noise reduction convex strip, and because a part of the second noise reduction convex strip enters the noise reduction groove, the difficulty of bypassing the structure is very large, the reflowing wind volume is very little, and the noise of the fan can be greatly reduced.

The second noise reduction protruding strip is fixed on the surface, close to the inner wall of the shell, of the impeller, and the noise reduction groove is formed in the inner wall of the shell. By adopting the structure, the processing is more convenient, and the operation of the impeller is hardly influenced.

The surface of the impeller, which is close to the inner wall of the shell, is provided with two first noise reduction protruding strips. By adopting the structure, the noise reduction effect is better.

The second noise reduction convex strip and the first noise reduction convex strip are distributed along the radial direction by taking the air inlet as the center, and the second noise reduction convex strip is closer to the air inlet than the first noise reduction convex strip. By adopting the structure, the noise reduction effect is better.

One of the first noise reduction ribs is adjacent to an edge of the impeller. By adopting the structure, the noise reduction effect is better.

Compared with the prior art, the utility model has the beneficial effects that: the size of subassembly of making an uproar falls through reducing the backward flow clearance leads to the windage of backward flow wind to increase, and the backward flow amount of wind diminishes, and the velocity of flow reduces to make the noise reduce, the effect is very good.

Drawings

FIG. 1 is a schematic plan view of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

fig. 3 is an enlarged view of a portion a in fig. 2.

Detailed Description

The present invention will be further described with reference to the following examples and the accompanying drawings.

As shown in fig. 1-3, a noise reduction structure of a micro fan includes a housing 1, an air inlet 2 is formed in the housing 1, an impeller 3 is installed in the housing 1, the impeller 3 is close to the air inlet 2, a backflow gap 4 is formed between the impeller 3 and the housing 1, a noise reduction assembly is arranged in the backflow gap 4, and the noise reduction assembly reduces the size of the backflow gap 4 to achieve the purpose of noise reduction.

The casing 1 comprises an upper volute and a lower volute, wherein the lower volute is provided with the air inlet 2, the impeller 3 is a centrifugal impeller, and the backflow gap is formed between the impeller and the lower volute.

The noise reduction assembly comprises at least one first noise reduction protruding strip 5, and the first noise reduction protruding strip 5 is annular and surrounds the air inlet 2.

The noise reduction assembly further comprises a second noise reduction protruding strip 6 and a second noise reduction groove 7, the second noise reduction protruding strip 6 or the noise reduction groove 7 is positioned on the impeller 3, the other noise reduction protruding strip is positioned on the inner wall of the shell 1, the second noise reduction protruding strip 6 surrounds the air inlet 2, the second noise reduction protruding strip 6 penetrates through the backflow gap 4 and then enters the noise reduction groove 7, namely the second noise reduction protruding strip 6 can be arranged on the impeller or the inner wall of the shell 1, in the utility model, the second noise reduction protruding strip 6 is fixed on the surface of the impeller 3 close to the inner wall of the shell 1, namely the surface of the lower volute, the noise reduction groove 7 is arranged on the inner wall of the shell 1, the width of the noise reduction groove 7 is larger than the annular arm thickness of the second noise reduction protruding strip 6, therefore, when the impeller 3 rotates, the second noise reduction protrusion 6 is rotatable in the noise reduction groove 7 with rotation of the impeller 3. Of course, the impeller may be provided with a noise reduction groove, and the inner wall of the casing may be provided with a second noise reduction protrusion 6.

Impeller 3 is close to install two on the surface of 1 inner wall of casing 1 the sand grip 5 of making an uproar falls in the first sand grip 5 of making an uproar that falls of two promptly all is located the impeller and is close to down on the surface of spiral case.

The second noise reduction convex strips 6 and the first noise reduction convex strips 5 are radially distributed by taking the air inlet 2 as a center, and the second noise reduction ribs 6 are closer to the air intake port 2 than the first noise reduction ribs 5, specifically, one of the first noise reduction ribs 5 is close to the edge of the impeller 3, the other first noise reduction rib 5 is positioned between the second noise reduction rib 6 and the first noise reduction rib 5 on the edge of the impeller 3, meet promptly stopping when the wind fraction that the impeller was thrown away just got into in the backward flow clearance like this, lead to the backward flow volume to reduce, meet the second once more when continuing the backward flow and fall the sand grip 5 of making an uproar and stop, the windage further increases, meets the second at last and falls sand grip 6 of making an uproar and stop, the windage steeply increases substantially, leads to the amount of wind of backward flow very little to reduced the backward flow amount of wind, reduced the noise that the backward flow wind strikeed the casing.

The first sand grip 5 of making an uproar and the second sand grip 6 of making an uproar and impeller integrated into one piece fall.

Of course, a bracket-like structure may be provided on the inner wall of the casing or the surface of the impeller, and the first noise reduction protrusion 5 and the second noise reduction protrusion 6 may be attached to the bracket as long as they are in the return flow gap.

The method is characterized in that a blank sample is obtained by taking a backflow gap without any noise reduction structure, an experimental sample is obtained by mounting one first noise reduction convex strip 5, two first noise reduction convex strips 5 and two first noise reduction convex strips 5+ one second noise reduction convex strip 6 on the surface of an impeller, the experimental sample is named as sample 1-3 to carry out noise test, and the results are shown in the following table.

As can be seen from the above table, the blank samples have large noise, and the samples 1 to 3 with the noise reduction structures added have good noise reduction effect, especially the sample 3 has only half of the noise of the blank samples, and the noise reduction effect is very significant.

Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.

Claims

1. The utility model provides a structure of making an uproar falls in micro-fan, includes casing (1), air intake (2), its characterized in that have been seted up on casing (1): install impeller (3) in casing (1), impeller (3) are close to air intake (2), backflow clearance (4) have between impeller (3) and casing (1), be provided with in this backflow clearance (4) and fall the subassembly of making an uproar, thereby fall the subassembly of making an uproar through reducing the size of backflow clearance (4) reaches the purpose of making an uproar.

2. The noise reduction structure of the micro blower according to claim 1, wherein: the noise reduction assembly comprises at least one first noise reduction protruding strip (5), wherein the first noise reduction protruding strip (5) is annular and surrounds the air inlet (2).

3. The noise reduction structure of a micro-blower according to claim 2, characterized in that: the noise reduction assembly further comprises a circular second noise reduction convex strip (6) and a circular noise reduction groove (7), the second noise reduction convex strip (6) or the noise reduction groove (7) is located on the impeller (3), the other noise reduction concave groove is located on the inner wall of the shell (1), the second noise reduction convex strip (6) surrounds the air inlet (2), and the second noise reduction convex strip (6) penetrates through the backflow gap (4) and then enters the noise reduction groove (7).

4. The noise reduction structure of a micro-blower according to claim 3, characterized in that: the second noise reduction protruding strips (6) are fixed on the surface, close to the inner wall of the shell (1), of the impeller (3), and the noise reduction grooves (7) are formed in the inner wall of the shell (1).

5. The noise reduction structure of a micro-blower according to claim 3, characterized in that: impeller (3) are close to install two on the surface of casing (1) inner wall first sand grip (5) of making an uproar fall.

6. The noise reduction structure of a micro-blower according to claim 5, characterized in that: the convex strip (6) of making an uproar and the first convex strip (5) of making an uproar of second use air intake (2) radially distribute as the center, just convex strip (6) of making an uproar is made an uproar more than first convex strip (5) of making an uproar is made an uproar to the second is closer to air intake (2).

7. The noise reduction structure of a micro-blower according to claim 2 or 5, characterized in that: one of the first noise reduction ribs (5) is close to the edge of the impeller (3).