CN210118285U - Centrifugal fan shell, centrifugal fan and clothes dryer - Google Patents

Abstract

The utility model belongs to the technical field of fans, and aims to solve the problem that noise is generated when the volute tongue of the existing centrifugal fan intercepts the flow to change the airflow direction. Therefore, the utility model provides a casing of a centrifugal fan, a centrifugal fan and a clothes dryer. The casing comprises a volute tongue, the windward part of the volute tongue is inclined and the windward area of the windward part is directed from the weak windward end of the windward part. The strong windward end of the windward part gradually or gradually becomes larger. By slanting the windward part of the volute tongue, the airflow at the bottom of the volute tongue is first cut by the volute tongue, and the airflow at the top of the volute tongue is cut by the volute tongue, so as to prevent the volute tongue from cutting the airflow at one time. Layered cutting can effectively reduce the generation of noise, and the windward area of the windward part gradually or gradually increases from the weak windward end to the strong windward end, the airflow at the bottom of the shell is small, and the small windward area of the windward part is conducive to interception. , the air flow at the top of the shell is large, and the windward area of the windward part is large, which is conducive to reducing noise.

Description

Centrifugal fan casing, centrifugal fan and clothes dryer

technical field

The utility model belongs to the technical field of fans, and particularly provides a casing of a centrifugal fan, a centrifugal fan and a clothes dryer.

Background technique

The centrifugal fan is based on the principle of converting kinetic energy into potential energy, using a high-speed rotating impeller to accelerate the gas, then decelerate and change the flow direction, so that the kinetic energy is converted into potential energy (pressure). Centrifugal fans are widely used in ventilation, dust removal and cooling in factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced draft in boilers and industrial furnaces; cooling and air conditioning in air conditioning equipment and household appliances. Ventilation; drying and selection of grain; air source of wind tunnel and inflation and propulsion of hovercraft, etc.

Taking the clothes dryer as an example, the fan on the existing clothes dryer generally adopts a centrifugal fan. The centrifugal fan includes a driving motor, a casing and an impeller arranged in the casing. The air outlet of the body is provided with a volute tongue, which can intercept the flow so that the air flow leaves the impeller and is discharged from the air outlet. The existing volute tongue is arranged vertically and is approximately parallel to the blade edge of the impeller. The blade periodically passes through the volute tongue, and the volute tongue cuts the airflow instantly, which will cause local pressure pulsation and single-frequency noise, thus affecting the sound quality of the whole machine. .

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

Utility model content

In order to solve the above problems in the prior art, that is, in order to solve the problem that the volute tongue of the existing centrifugal fan will generate noise when the flow is intercepted to change the airflow direction, the utility model provides a casing of the centrifugal fan, the casing It includes a volute tongue, the windward part of the volute tongue is inclined and the windward area of the windward part increases gradually or step by step from the weak windward end of the windward part to the strong windward end of the windward part.

In the preferred technical solution of the above-mentioned housing, the windward area of the windward portion gradually increases smoothly from the weak windward end to the strong windward end.

In the preferred technical solution of the above housing, the windward portion is arranged in a curve.

In the preferred technical solution of the above housing, the curve is a parabolic curve, a spline curve or a circular arc curve.

In the preferred technical solution of the above housing, the windward portion is provided with rounded corners.

In the preferred technical solution of the above housing, the included angle between the line connecting the strong windward end and the weak windward end and the horizontal plane is 30 to 80 degrees.

In the preferred technical solution of the above housing, the included angle between the line connecting the strong windward end and the weak windward end and the horizontal plane is 30 to 80 degrees.

In a preferred technical solution of the above housing, the windward part includes a first part and a second part, the first part is close to the strong windward end, and the second part is close to the weak windward end.

In the preferred technical solution of the above housing, the first part and/or the second part are arranged in a curve.

In the preferred technical solution of the above housing, the curve is a parabolic curve, a spline curve and/or a circular arc curve.

In the preferred technical solution of the above housing, the first part and/or the second part are provided with rounded corners.

In the preferred technical solution of the above housing, the included angle between the line connecting the strong windward end and the weak windward end and the horizontal plane is 30 to 80 degrees.

In the preferred technical solution of the above housing, the included angle between the line connecting the strong windward end and the weak windward end and the horizontal plane is 30 to 80 degrees.

In the preferred technical solution of the above housing, the windward part includes at least three parts.

In the preferred technical solution of the above-mentioned housing, at least one part of the windward part is arranged in a curve.

In the preferred technical solution of the above housing, the curve is a parabolic curve, a spline curve and/or a circular arc curve.

In the preferred technical solution of the above-mentioned housing, at least one part of the windward part is provided with rounded corners.

In the preferred technical solution of the above housing, the included angle between the line connecting the strong windward end and the weak windward end and the horizontal plane is 30 to 80 degrees.

In the preferred technical solution of the above housing, the included angle between the line connecting the strong windward end and the weak windward end and the horizontal plane is 30 to 80 degrees.

In another aspect, the present invention also provides a centrifugal fan, which includes the above-mentioned housing.

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

Those skilled in the art can understand that, in the preferred technical solution of the present invention, the windward portion of the volute tongue is inclined, so that the airflow at the bottom of the volute tongue is first cut by the volute tongue, and the airflow at the top of the volute tongue is cut by the volute tongue first. The volute tongue is cut, so as to avoid the volute tongue cutting the airflow at one time, and the noise can be effectively reduced by cutting the airflow in layers. In addition, the windward area of the windward part of the volute tongue of the present invention gradually increases or gradually increases from the weak windward end of the windward part to the strong windward end of the windward part. This arrangement not only helps to improve the interception efficiency of the volute tongue, but also improves the efficiency of the volute tongue. It can effectively reduce the generation of noise. Specifically, since the gas enters from the bottom of the casing and flows upward, and flows to the surrounding after hitting the impeller rear disc, the airflow at the top of the casing is greater than the airflow at the bottom of the casing. Based on this, the present utility model The windward area of the windward part of the volute tongue gradually or gradually increases from the weak windward end (located at the bottom of the shell, with a small air flow) to the strong windward end (located at the top of the shell, with a large air flow). Small air flow, small windward area of the windward part is conducive to interception, large air flow at the top of the shell, and large windward area of the windward part can reduce the generation of noise.

Further, the windward area of the windward portion of the volute tongue gradually increases smoothly from the weak windward end to the strong windward end. With this arrangement, the windward area becomes larger smoothly, which not only improves the aesthetics of the volute tongue, but also facilitates the flow of the airflow.

Further, the windward portion of the volute tongue is provided with rounded corners. With such an arrangement, that is, the windward part is arranged as a circular arc surface, the air flow can be smoothly transitioned, thereby helping to reduce the generation of noise.

Further, the included angle between the line connecting the strong windward end and the weak windward end of the windward part and the horizontal plane is 30 to 80 degrees. With this arrangement, the phenomenon of gas backflow at the air outlet of the housing can be effectively avoided. Specifically, if the angle between the connection line between 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 will be too large, and if the cross-sectional area of the air duct is too large, the airflow cannot fill the entire area. The air duct, where there is no airflow, will generate negative pressure, which will lead to gas backflow under the action of negative pressure.

In addition, the centrifugal fan further provided by the present invention on the basis of the above-mentioned technical solution adopts the above-mentioned housing, and further has the technical effect possessed by the above-mentioned housing. Compared with the centrifugal fan before the improvement, the centrifugal fan of the present invention has Fans are less noisy.

Description of drawings

The preferred embodiments of the present utility model are described below with reference to the accompanying drawings, in which:

Fig. 1 is the structural representation one of the embodiment one of the centrifugal fan of the present utility model;

Fig. 2 is the second structural schematic diagram of Embodiment 1 of the centrifugal fan of the present invention;

3 is a schematic structural diagram 1 of Embodiment 2 of the centrifugal fan of the present invention;

4 is a second structural schematic diagram of Embodiment 2 of the centrifugal fan of the present invention.

Detailed ways

First of all, those skilled in the art should understand that the embodiments described below are only used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention.

It should be noted that in the description of the present invention, the terms "front", "rear", "upper", "lower", "top", "bottom", "inner", "outer", etc. indicate directions or positions The terminology of the relationship is based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as Limitations of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In addition, it should be noted that, in the description of the present invention, unless otherwise expressly specified and limited, the terms "installation", "arrangement", "connection" and "connection" should be understood in a broad sense, for example, it may be A fixed connection can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Based on the background art, the volute tongue of the existing centrifugal fan will generate noise when the airflow is intercepted to change the airflow direction. The utility model provides a casing of a centrifugal fan, a centrifugal fan and a clothes dryer, which aim to effectively reduce the noise of the centrifugal fan.

Specifically, the centrifugal fan of the present invention includes a casing, the casing includes a volute tongue, the windward part of the volute tongue is inclined and the windward area of the windward part is gradually or gradually or gradually increased from the weak windward end of the windward part to the strong windward end of the windward part. get bigger. It can be known from the background technology that the volute tongue of the existing centrifugal fan is arranged vertically and is approximately parallel to the blade edge of the impeller. For this reason, the utility model makes the windward part of the volute tongue inclined, so that the air flow at the bottom of the volute tongue is first cut by the volute tongue, and the airflow at the top of the volute tongue is cut by the volute tongue, so as to prevent the volute tongue from cutting the airflow one-time by the volute tongue. Cutting can effectively reduce the noise generation by cutting the airflow layered. In addition, since the gas enters from the bottom of the casing and flows upward, and flows to the surrounding after impacting the impeller, the air flow at the top of the casing is greater than the air flow at the bottom of the casing. The windward area of the windward part of the tongue increases gradually or gradually from the weak windward end (located at the bottom of the shell, with a small airflow) to the strong windward end of the windward part (located at the top of the shell, with a large airflow), and the bottom of the shell The airflow at the top of the casing is small, and the windward area of the windward part is small, which is conducive to the interception. With this arrangement, it is not only beneficial to improve the interception efficiency of the volute tongue, but also beneficial to reduce the generation of noise. Wherein, the windward area of the windward part can gradually increase smoothly from the weak windward end to the strong windward end, or it can gradually increase from the weak windward end to the strong windward end, and this flexible adjustment and change does not deviate from the present invention. The principle and scope of the invention should be limited to the protection scope of the present invention. The technical solutions of the present utility model are described in detail below with reference to specific embodiments.

Example 1

The technical solution of Embodiment 1 of the present invention will be described below with reference to FIGS. 1 and 2 , wherein, FIG. 1 is a schematic structural diagram 1 of Embodiment 1 of the centrifugal fan of the present invention, and FIG. 2 is a schematic diagram of the centrifugal fan of the present invention. Schematic diagram 2 of the structure of the first embodiment.

As shown in FIGS. 1 and 2 , the centrifugal fan of the present invention includes a casing 1, an impeller 2 is arranged in the casing 1, and the casing 1 includes a volute tongue 3, and the windward area of the windward part 31 of the volute tongue 3 is formed by a weak windward The end 311 gradually becomes larger toward the strong windward end 312 . By smoothly increasing the windward area of the windward portion 31 of the volute 3, the appearance of the volute 3 is improved, and the flow of the air flow is facilitated.

Preferably, as shown in FIGS. 1 and 2 , the windward portion 31 of the volute tongue 3 is arranged in a curve from the weak windward end 311 to the strong windward end 312 . Wherein, the windward portion 31 can be arranged in a parabolic curve, or a spline curve, or a circular arc curve. The adjustment and change of the specific setting type of the curve of the windward portion 31 does not deviate from the principle of the present invention and scope should be limited within the protection scope of the present invention.

Preferably, as shown in FIGS. 1 and 2 , the windward portion 31 of the volute tongue 3 is provided with rounded corners when viewed laterally. That is to say, the windward part 31 is arranged to be a circular arc surface in the lateral direction, which can make the air flow smoothly transition, thereby helping to reduce the generation of noise.

Preferably, as shown in FIG. 2 , the included angle between the line connecting the strong windward end 312 and the weak windward end 311 of the windward portion 31 and the horizontal plane is 30 to 80 degrees. The angle between the line connecting the strong windward end 312 and the weak windward end 311 and the horizontal plane refers to the angle a in FIG. 2 , that is, the angle a is 30 to 80 degrees. With this arrangement, the phenomenon of gas backflow at the air outlet 11 of the housing 1 can be avoided. Specifically, if the angle a is too small, the cross-sectional area of the air duct at the air outlet 11 will be too large. If the cross-sectional area of the air duct is too large, the airflow will not be able to fill the entire air duct, and negative pressure will be generated in the part without airflow. , under the action of negative pressure, it will cause gas backflow.

As mentioned above, the present utility model makes the windward portion 31 of the volute 3 to be inclined, so that the airflow at the bottom of the volute 3 is first cut by the volute 3, and the airflow at the top of the volute 3 is cut by the volute 3, thereby avoiding The volute tongue 3 cuts the airflow at one time, and can effectively reduce the noise generation by cutting the airflow in layers. In addition, since the gas enters from the bottom of the casing 1 and flows upward, and flows around after hitting the rear disc 21 of the impeller, the airflow at the top of the casing 1 is greater than the airflow at the bottom of the casing 1. Based on this, this The windward area of the windward portion 31 of the volute tongue 3 of the utility model is from the weak windward end 311 (located at the bottom of the casing 1, with a small airflow) to the strong windward end 312 of the windward portion 31 (located at the top of the casing 1, with a large airflow). ) gradually becomes larger, the air flow at the bottom of the casing 1 is small, the windward area of the windward part 31 is small, which is conducive to interception, the air flow at the top of the casing 1 is large, and the windward area of the windward part 31 is large, which is conducive to reducing the generation of noise. The setting is not only beneficial to improve the interception efficiency of the volute tongue 3, but also beneficial to reduce the generation of noise.

Embodiment 2

The technical solution of the second embodiment of the present utility model will be described below in conjunction with Fig. 3 and Fig. 4 , wherein, Fig. 3 is the first structural schematic diagram of the second embodiment of the centrifugal fan of the present utility model, and Fig. 4 is the schematic diagram of the second embodiment of the centrifugal fan of the present utility model. The second structural schematic diagram of the second embodiment.

As shown in FIG. 3 and FIG. 4 , the centrifugal fan of the present invention includes a casing 1, an impeller 2 is arranged in the casing 1, the casing 1 includes a volute 3, and the windward portion 31 of the volute 3 includes a first part 31A and a second The two parts 31B, the first part 31A is close to the strong windward end 312 , and the second part 31B is close to the weak windward end 311 . The windward area of the windward part 31 is divided into two levels, the windward area of the first part 31A is larger than that of the second part 31B, that is, the windward area of the windward part 31 gradually increases from the weak windward end 311 to the strong windward end 312 . Of course, the first part 31A and the second part 31B here are only exemplary, and the windward part 31 can also be divided into three parts or more parts, that is, the windward area of the windward part 31 is not limited to two levels, but can also be divided into three parts. This flexible adjustment and change does not deviate from the principle and scope of the present invention, and should be limited to the protection scope of the present invention.

Preferably, as shown in FIGS. 3 and 4 , the first portion 31A and/or the second portion 31B of the windward portion 31 are arranged in a curve. In a possible situation, the first part 31A of the windward part 31 is arranged in a curve, and the second part 31B is arranged in a straight line. In this case, the first part 31A can be arranged in a parabolic curve or a spline curve, and then Or set in a circular arc curve, the adjustment and change of the specific set type of the curve of the first part 31A does not deviate from the principle and scope of the present invention, and should be limited within the protection scope of the present invention. In another possible situation, the first part 31A of the windward part 31 is arranged in a straight line, and the second part 31B is arranged in a curve. In this case, the second part 31B can be arranged in a parabolic curve or a spline curve. , or set in a circular arc curve, the adjustment and change of the specific setting type of the curve of the second part 31B does not deviate from the principle and scope of the present invention, and should be limited within the protection scope of the present invention. In a preferred situation, both the first part 31A and the second part 31B of the windward part 31 are arranged in a curve, in this case, the curve type of the first part 31A and the second part 31B can be the same, for example, the first part 31A and the The second portions 31B are all arranged in a parabolic curve. Of course, the types of curves of the first part 31A and the second part 31B can also be different, for example, the first part 31A is arranged in a parabolic curve, the second part 31B is arranged in a circular arc curve, etc. The adjustment and change of the specific setting type of the curve of part 31B does not deviate from the principle and scope of the present invention, and should be limited within the protection scope of the present invention. Furthermore, if the windward part 31 includes at least three parts, in this case, only one part of the windward part 31 may be arranged in a curve, or a plurality of parts of the windward part 31 may be arranged in a curve, and further alternatively, it is possible to All parts of the windward part 31 are arranged in a curve, and if a plurality of parts in the windward part 31 are arranged in a curve, the type of the curve can be one or more of a parabolic curve, a spline curve, and a circular arc curve , this flexible adjustment and change does not deviate from the principle and scope of the present utility model, and should be limited within the protection scope of the present utility model.

Preferably, as shown in FIG. 3 and FIG. 4 , the first portion 31A and/or the second portion 31B of the windward portion 31 are provided with rounded corners. In a possible situation, the first part 31A of the windward part 31 is provided with rounded corners, that is, the first part 31A is an arc surface, and the second part 31B is a plane; in another possible situation, the first part 31A of the windward part 31 The two parts 31B are provided with rounded corners, that is, the second part 31B is a circular arc surface, and the first part 31A is a plane; in a preferred case, the first and second parts 31A and 31B of the windward part 31 are provided with rounded corners , that is, both the first part 31A and the second part 31B are circular arc surfaces, and through this arrangement, the air flow can be smoothly transitioned, thereby helping to reduce the generation of noise. Furthermore, if the windward portion 31 includes at least three portions, in this case, only one portion of the windward portion 31 may be rounded, or a plurality of portions of the windward portion 31 may be rounded, or , all parts of the windward part 31 can be rounded, and this flexible adjustment and change does not deviate from the principle and scope of the present invention, and should be limited to the protection scope of the present invention.

Preferably, as shown in FIGS. 3 and 4 , the angle between the line connecting the strong windward end 312 and the weak windward end 311 of the windward portion 31 and the horizontal plane is 30 to 80 degrees. The angle between the line connecting the strong windward end 312 and the weak windward end 311 and the horizontal plane refers to the angle b in FIG. 4 , that is, the angle b is 30 to 80 degrees. With this arrangement, the phenomenon of gas backflow at the air outlet 11 of the housing 1 can be avoided. Specifically, if the angle b is too small, the cross-sectional area of the air duct at the air outlet 11 will be too large. If the cross-sectional area of the air duct is too large, the airflow will not be able to fill the entire air duct, and negative pressure will be generated in the part without airflow. , under the action of negative pressure, it will cause gas backflow. In addition, if the windward part 31 includes at least three parts, in this case, the angle between the line connecting the strong windward end 312 and the weak windward end 311 of the windward part 31 and the horizontal plane is also 30 to 80 degrees.

As mentioned above, the present utility model makes the windward portion 31 of the volute 3 to be inclined, so that the airflow at the bottom of the volute 3 is first cut by the volute 3, and the airflow at the top of the volute 3 is cut by the volute 3, thereby avoiding The volute tongue 3 cuts the airflow at one time, and can effectively reduce the noise generation by cutting the airflow in layers. In addition, since the gas enters from the bottom of the casing 1 and flows upward, and flows around after hitting the rear disc 21 of the impeller, the airflow at the top of the casing 1 is greater than the airflow at the bottom of the casing 1. Based on this, this The windward area of the windward portion 31 of the volute tongue 3 of the utility model is from the weak windward end 311 (located at the bottom of the casing 1, with a small airflow) to the strong windward end 312 of the windward portion 31 (located at the top of the casing 1, with a large airflow). ) gradually becomes larger in layers, the airflow at the bottom of the casing 1 is small, the windward area of the windward part 31 is small, which is conducive to interception, the air flow at the top of the casing 1 is large, and the windward area of the windward part 31 is large, which is conducive to reducing the generation of noise. , Through this arrangement, it is beneficial to improve the interception efficiency of the volute tongue 3 and to reduce the generation of noise.

Finally, the present invention also provides a clothes dryer, which includes the centrifugal fan of the first embodiment or the second embodiment.

So far, the technical solutions of the present invention have been described with reference to the preferred embodiments shown in the accompanying drawings, but those skilled in the art can easily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. On the premise of not departing from the principle of the present invention, those skilled in the art can make equivalent changes or replacements to the relevant technical features, and the technical solutions after these changes or replacements will fall within the protection scope of the present invention.

Claims (21)

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.

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