阅读说明：本技术 离心风机的壳体、离心风机及干衣机 (Centrifugal fan shell, centrifugal fan and clothes dryer ) 是由 李涛 杨龙 邴进东 朱冬冬 楚振嘉 于 2019-04-12 设计创作，主要内容包括：本发明属于风机技术领域,旨在解决现有离心风机的蜗舌在截流以改变气流方向时会产生噪声的问题。为此,本发明提供了一种离心风机的壳体、离心风机及干衣机,壳体包括蜗舌,蜗舌的迎风部倾斜设置且迎风部的迎风面积由迎风部的弱迎风端向迎风部的强迎风端逐渐或逐级变大。通过使蜗舌的迎风部倾斜设置,使得位于蜗舌底部的气流先被蜗舌切割,位于蜗舌顶部的气流后被蜗舌切割,以此避免蜗舌将气流一次性的切割,通过对气流分层切割能够有效地减少噪声的产生,并且,迎风部的迎风面积由弱迎风端向强迎风端逐渐或逐级变大,壳体底部的气流量小,迎风部的迎风面积小有利于截流,壳体顶部的气流量大,迎风部的迎风面积大有利于减小噪声。(The invention belongs to the technical field of fans and aims to solve the problem that the volute tongue of the existing centrifugal fan generates noise when the volute tongue is cut off to change the direction of airflow. Therefore, the invention provides a shell of a centrifugal fan, the centrifugal fan and a clothes dryer, wherein the shell comprises a volute tongue, a windward part of the volute tongue is obliquely arranged, and the windward area of the windward part is gradually or gradually increased from the weak windward end of the windward part to the strong windward end of the windward part. The windward area of the windward part is small and favorable for intercepting, the airflow at the top of the shell is large, and the windward area of the windward part is favorable for reducing noise greatly.)

1. The shell of the centrifugal fan is characterized in that the shell comprises a volute tongue, a windward part of the volute tongue is obliquely arranged, and the windward area of the windward part is gradually or gradually increased from a weak windward end of the windward part to a strong windward end of the windward part.

2. The housing according to claim 1, wherein a windward area of the windward portion smoothly becomes gradually larger from the weak windward end to the strong windward end.

3. The housing of claim 2, wherein the windward portion is curvilinear.

4. The housing of claim 3, wherein the curve is a parabolic curve, a spline curve, or a circular arc curve.

5. The housing according to any one of claims 2 to 4, wherein the windward portion is rounded.

6. The housing according to any one of claims 2 to 4, wherein the line connecting the strong and weak windward ends forms an angle of 30 to 80 degrees with the horizontal plane.

7. The housing of claim 5, wherein the line connecting the strong and weak windward ends is at an angle of 30 to 80 degrees to the horizontal.

8. The housing of claim 1, wherein the windward portion comprises a first portion proximate the strong windward end and a second portion proximate the weak windward end.

9. The housing according to claim 8, characterized in that the first portion and/or the second portion is/are curvilinearly arranged.

10. The housing according to claim 9, characterized in that the curve is a parabolic curve, a spline curve and/or a circular arc curve.

11. The housing according to any one of claims 8 to 10, wherein the first portion and/or the second portion are rounded.

12. The housing according to any one of claims 8 to 10, wherein the line connecting the strong and weak windward ends makes an angle of 30 to 80 degrees with the horizontal plane.

13. The housing of claim 11 wherein the line connecting the strong and weak windward ends is at an angle of 30 to 80 degrees to the horizontal.

14. The housing of claim 1, wherein the windward portion comprises at least three portions.

15. The housing of claim 14, wherein at least a portion of the windward portion is curvilinearly disposed.

16. The housing according to claim 15, characterized in that the curve is a parabolic curve, a spline curve and/or a circular arc curve.

17. The housing according to any one of claims 14 to 16, wherein at least one portion of the windward portion is rounded.

18. The housing according to any one of claims 14 to 16 wherein the line connecting the strong and weak wind-facing ends makes an angle of 30 to 80 degrees with the horizontal.

19. The housing of claim 17 wherein the line connecting the strong and weak windward ends is at an angle of 30 to 80 degrees to the horizontal.

20. A centrifugal fan, characterized in that it comprises a casing according to any one of claims 1 to 19.

21. Laundry dryer, characterized in that it comprises a centrifugal fan according to claim 20.

Technical Field

The invention belongs to the technical field of fans, and particularly provides a shell of a centrifugal fan, the centrifugal fan and a clothes dryer.

Background

The centrifugal fan accelerates gas by using an impeller rotating at a high speed according to the principle that kinetic energy is converted into potential energy, and then decelerates and changes the flow direction so as to convert the kinetic energy into the potential energy (pressure). Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and draught of boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; drying and selecting grains; wind tunnel wind source and air cushion boat inflation and propulsion.

Taking a clothes dryer as an example, a centrifugal fan is generally adopted as a fan on an existing clothes dryer, the centrifugal fan comprises a driving motor, a shell and an impeller arranged in the shell, the driving motor can drive the impeller to rotate at a high speed so as to accelerate air, and a volute tongue is arranged at an air outlet of the shell and can cut off to enable air flow to leave the impeller and be discharged from an air outlet. The existing volute tongue is vertically arranged and approximately parallel to the edge of a blade of the impeller, the blade periodically passes through the volute tongue, the volute tongue instantly cuts airflow, local pressure pulsation can be caused, single-frequency noise is generated, and therefore the sound quality of the whole machine is affected.

Therefore, there is a need in the art for a new centrifugal fan housing and a corresponding centrifugal fan and dryer to solve the above problems.

Disclosure of Invention

In order to solve the above problems in the prior art, that is, to solve the problem that the volute tongue of the existing centrifugal fan generates noise when intercepting to change the airflow direction, the invention provides a housing of the centrifugal fan, wherein the housing comprises the volute tongue, a windward part of the volute tongue is obliquely arranged, and the windward area of the windward part is gradually or gradually increased from a weak windward end of the windward part to a strong windward end of the windward part.

In a preferred embodiment of the above casing, a windward area of the windward portion is gradually increased smoothly from the weak windward end to the strong windward end.

In a preferred embodiment of the above casing, the windward portion is disposed in a curved line.

In a preferred embodiment of the above casing, the curve is a parabolic curve, a spline curve or a circular arc curve.

In a preferred technical scheme of the shell, the windward portion is arranged in a round angle mode.

In the preferable technical scheme of the shell, an included angle between a connecting line of the strong windward end and the weak windward end and a horizontal plane is 30-80 degrees.

In the preferable technical scheme of the shell, an included angle between a connecting line of the strong windward end and the weak windward end and a horizontal plane is 30-80 degrees.

In a preferred embodiment of the above casing, the windward portion includes a first portion and a second portion, the first portion is close to the strong windward end, and the second portion is close to the weak windward end.

In a preferred embodiment of the above casing, the first portion and/or the second portion are/is curved.

In a preferred embodiment of the above casing, the curve is a parabolic curve, a spline curve and/or a circular arc curve.

In a preferred embodiment of the above casing, the first portion and/or the second portion are rounded.

In the preferable technical scheme of the shell, an included angle between a connecting line of the strong windward end and the weak windward end and a horizontal plane is 30-80 degrees.

In the preferable technical scheme of the shell, an included angle between a connecting line of the strong windward end and the weak windward end and a horizontal plane is 30-80 degrees.

In a preferred embodiment of the above housing, the windward portion includes at least three portions.

In a preferred embodiment of the above casing, at least one portion of the windward portion is provided in a curved line.

In a preferred embodiment of the above casing, the curve is a parabolic curve, a spline curve and/or a circular arc curve.

In a preferred embodiment of the above casing, at least one portion of the windward portion is rounded.

In the preferable technical scheme of the shell, an included angle between a connecting line of the strong windward end and the weak windward end and a horizontal plane is 30-80 degrees.

In the preferable technical scheme of the shell, an included angle between a connecting line of the strong windward end and the weak windward end and a horizontal plane is 30-80 degrees.

In another aspect, the invention also provides a centrifugal fan comprising the housing described above.

In another aspect, the present invention also provides a clothes dryer including the centrifugal fan described above.

The technical scheme includes that the windward part of the volute tongue is obliquely arranged, so that airflow at the bottom of the volute tongue is firstly cut by the volute tongue, and airflow at the top of the volute tongue is then cut by the volute tongue, and therefore the volute tongue is prevented from cutting the airflow once, and noise can be effectively reduced by cutting the airflow in a layered manner. In addition, the windward area of the windward part of the volute tongue is gradually or gradually increased from the weak windward end of the windward part to the strong windward end of the windward part, and through the arrangement, the intercepting efficiency of the volute tongue is favorably improved, and the generation of noise can be effectively reduced. Specifically, because the gas enters from the bottom of the shell and flows upwards, and flows to the periphery after impacting the rear disc of the impeller, the flow of the gas at the top of the shell is larger than that at the bottom of the shell, so that the windward area of the windward part of the volute tongue is gradually or gradually increased from a weak windward end (positioned at the bottom of the shell and having small flow) to a strong windward end (positioned at the top of the shell and having large flow), the flow of the gas at the bottom of the shell is small, the windward area of the windward part is favorable for intercepting, the flow of the gas at the top of the shell is large, and the windward area of the windward part is large, so that the noise can be reduced.

Furthermore, the windward area of the windward part of the volute tongue is smoothly and gradually increased from the weak windward end to the strong windward end. By the arrangement, the windward area is smoothly enlarged, the aesthetic property of the volute tongue is improved, and the airflow flowing is facilitated.

Furthermore, the windward part of the volute tongue is arranged in a round angle. By such an arrangement, the windward portion is formed into an arc surface, so that the air flow can be smoothly transited, which is advantageous for reducing the generation of noise.

Furthermore, the included angle between the connecting line of the strong windward end and the weak windward end of the windward part and the horizontal plane is 30-80 degrees. Through such setting, can avoid the air outlet department of casing to produce gas reflux phenomenon effectively. Specifically, if the included angle between the connecting line of the strong windward end and the weak windward end and the horizontal plane is too small, the cross-sectional area of the air duct at the air outlet is too large, if the cross-sectional area of the air duct is too large, the air flow cannot fill the whole air duct, negative pressure is generated at the part without the air flow, and air backflow is caused under the action of the negative pressure.

In addition, the centrifugal fan further provided on the basis of the technical scheme has the technical effects of the shell due to the adoption of the shell, and compared with the centrifugal fan before improvement, the centrifugal fan provided by the invention has lower noise.

Drawings

Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

FIG. 1 is a first schematic structural diagram of a first embodiment of a centrifugal fan according to the present invention;

FIG. 2 is a schematic structural diagram of a first embodiment of a centrifugal fan according to the present invention;

FIG. 3 is a schematic structural diagram of a second embodiment of the centrifugal fan of the present invention;

fig. 4 is a second schematic structural view of a centrifugal fan according to a second embodiment of the present invention.

Detailed Description

First, it should be understood by those skilled in the art that the embodiments described below are merely for explaining technical principles of the present invention, and are not intended to limit the scope of the present invention.

It should be noted that in the description of the present invention, the terms "front", "back", "upper", "lower", "top", "bottom", "inner", "outer", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The problem of noise generated by the volute tongue of the existing centrifugal fan pointed out by the background art when intercepting water to change the direction of airflow. The invention provides a shell of a centrifugal fan, the centrifugal fan and a clothes dryer, and aims to effectively reduce the noise of the centrifugal fan.

Specifically, the centrifugal fan comprises a shell, wherein the shell comprises a volute tongue, a windward part of the volute tongue is obliquely arranged, and the windward area of the windward part is gradually or gradually increased from the weak windward end of the windward part to the strong windward end of the windward part. Known from the background art, the volute tongue of the existing centrifugal fan is vertically arranged and approximately parallel to the edge of the blade of the impeller, the blade periodically passes through the volute tongue, and the volute tongue instantly cuts air flow, so that the local pressure pulsation is caused, and single-frequency noise is generated. Therefore, the windward part of the volute tongue is obliquely arranged, so that airflow at the bottom of the volute tongue is firstly cut by the volute tongue, and airflow at the top of the volute tongue is then cut by the volute tongue, the volute tongue is prevented from cutting the airflow at one time, and noise can be effectively reduced by cutting the airflow in a layered manner. And because the gas enters from the bottom of the shell and flows upwards, and flows to the periphery after impacting the rear disk of the impeller, the flow of the gas at the top of the shell is larger than that at the bottom of the shell, so that the windward area of the windward part of the volute tongue is gradually or gradually increased from a weak windward end (positioned at the bottom of the shell and having small flow) to a strong windward end (positioned at the top of the shell and having large flow) of the windward part, the flow of the gas at the bottom of the shell is small, the windward area of the windward part is small, the flow of the gas at the top of the shell is large, and the windward area of the windward part is large, so that the noise is reduced. Through the arrangement, the interception efficiency of the volute tongue is favorably improved, and the noise is favorably reduced. The windward area of the windward part can be smoothly and gradually increased from the weak windward end to the strong windward end, and can also be gradually increased from the weak windward end to the strong windward end, and the flexible adjustment and change do not deviate from the principle and the scope of the invention and are limited within the protection scope of the invention. The technical solution of the present invention is described in detail below with reference to specific examples.