CN111810446A - Centrifugal fan shell, centrifugal fan and clothes dryer - Google Patents

Centrifugal fan shell, centrifugal fan and clothes dryer Download PDF

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Publication number
CN111810446A
CN111810446A CN201910296045.0A CN201910296045A CN111810446A CN 111810446 A CN111810446 A CN 111810446A CN 201910296045 A CN201910296045 A CN 201910296045A CN 111810446 A CN111810446 A CN 111810446A
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CN
China
Prior art keywords
windward
weak
strong
centrifugal fan
curve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910296045.0A
Other languages
Chinese (zh)
Inventor
李涛
杨龙
邴进东
朱冬冬
楚振嘉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Haier Washing Machine Co Ltd
Qingdao Haier Co Ltd
Original Assignee
Qingdao Haier Washing Machine Co Ltd
Qingdao Haier Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Haier Washing Machine Co Ltd, Qingdao Haier Co Ltd filed Critical Qingdao Haier Washing Machine Co Ltd
Priority to CN201910296045.0A priority Critical patent/CN111810446A/en
Priority to US17/603,113 priority patent/US11898575B2/en
Priority to EP20787549.3A priority patent/EP3954902A4/en
Priority to PCT/CN2020/083765 priority patent/WO2020207409A1/en
Publication of CN111810446A publication Critical patent/CN111810446A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/422—Discharge tongues
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Abstract

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.

Description

Centrifugal fan shell, centrifugal fan and clothes dryer
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.
Example one
The technical solution of the first embodiment of the present invention is described below with reference to fig. 1 and fig. 2, wherein fig. 1 is a first structural schematic diagram of the first embodiment of the centrifugal fan of the present invention, and fig. 2 is a second structural schematic diagram of the first embodiment of the centrifugal fan of the present invention.
As shown in fig. 1 and 2, the centrifugal fan of the present invention includes a casing 1, an impeller 2 is disposed in the casing 1, the casing 1 includes a volute tongue 3, and a windward area of a windward portion 31 of the volute tongue 3 smoothly gradually increases from a weak windward end 311 to a strong windward end 312. By smoothly enlarging the windward area of the windward portion 31 of the volute tongue 3, the appearance of the volute tongue 3 is improved, and the airflow flow is facilitated.
Preferably, as shown in fig. 1 and 2, the windward portion 31 of the volute tongue 3 is curvilinearly arranged from the weak windward end 311 to the strong windward end 312. The windward portion 31 may be disposed in a parabolic curve, a spline curve, or an arc curve, and such adjustment and change of the specific arrangement type of the windward portion 31 do not depart from the principle and scope of the present invention, and should be limited within the protection scope of the present invention.
Preferably, as shown in fig. 1 and 2, the windward portion 31 of the volute tongue 3 is rounded as viewed in the lateral direction. Namely, the windward portion 31 is formed into a circular arc surface in the lateral direction, which enables smooth transition of the air flow, thereby contributing to reduction of noise generation.
Preferably, as shown in fig. 2, the angle between the horizontal plane and the line connecting the strong windward end 312 and the weak windward end 311 of the windward portion 31 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 is the angle a in fig. 2, i.e. the angle a is 30 to 80 degrees. With such an arrangement, the gas backflow phenomenon 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 is too large, and if the cross-sectional area of the air duct is too large, the air flow cannot fill the whole air duct, and a negative pressure is generated at a portion without the air flow, which causes air to flow back under the action of the negative pressure.
As described above, according to the present invention, the windward portion 31 of the volute tongue 3 is obliquely disposed, so that the airflow at the bottom of the volute tongue 3 is firstly cut by the volute tongue 3, and the airflow at the top of the volute tongue 3 is then cut by the volute tongue 3, thereby preventing the volute tongue 3 from cutting the airflow once, and effectively reducing noise by cutting the airflow in layers. Moreover, because the gas enters from the bottom of the casing 1 and flows upwards, and flows around after impacting the impeller back disc 21, the gas flow at the top of the casing 1 is larger than that at the bottom of the casing 1, so that the windward area of the windward part 31 of the volute tongue 3 is gradually increased from the weak windward end 311 (which is positioned at the bottom of the casing 1 and has small gas flow) to the strong windward end 312 (which is positioned at the top of the casing 1 and has large gas flow) of the windward part 31, the small windward area of the windward part 31 is beneficial to interception, the large gas flow at the top of the casing 1 and the large windward area of the windward part 31 are beneficial to reducing the generation of noise, and through the arrangement, the interception efficiency of the volute tongue 3 is favorably improved, and the generation of noise is favorably reduced.
Example two
The technical solution of the second embodiment of the present invention is explained with reference to fig. 3 and fig. 4, wherein fig. 3 is a first structural schematic diagram of the second embodiment of the centrifugal fan of the present invention, and fig. 4 is a second structural schematic diagram of the second embodiment of the centrifugal fan of the present invention.
As shown in fig. 3 and 4, the centrifugal fan of the present invention includes a housing 1, an impeller 2 is disposed in the housing 1, the housing 1 includes a volute tongue 3, a windward portion 31 of the volute tongue 3 includes a first portion 31A and a second portion 31B, the first portion 31A is close to a strong windward end 312, and the second portion 31B is close to a weak windward end 311. The windward area of the windward portion 31 is divided into two stages, and the windward area of the first portion 31A is larger than the windward area of the second portion 31B, that is, the windward area of the windward portion 31 is gradually increased from the weak windward end 311 to the strong windward end 312. Of course, the first portion 31A and the second portion 31B are only exemplary, and the windward portion 31 may be divided into three or more portions, that is, the windward area of the windward portion 31 is not limited to two stages, and may be three or more stages, and such flexible adjustment and change do not depart from the principle and scope of the present invention, and should be limited within the protection scope of the present invention.
Preferably, as shown in fig. 3 and 4, the first portion 31A and/or the second portion 31B of the windward portion 31 are provided in a curved line. In a possible case, where the first portion 31A of the windward portion 31 is arranged in a curve and the second portion 31B is arranged in a straight line, in this case, the first portion 31A may be arranged in a parabolic curve, or in a spline curve, or in a circular arc curve, and such adjustment and change of the specific arrangement type of the curve of the first portion 31A does not depart from the principle and scope of the present invention, and should be limited within the protection scope of the present invention. In another possible case, the first portion 31A of the windward portion 31 is arranged in a straight line and the second portion 31B is arranged in a curved line, in which case the second portion 31B may be arranged in a parabolic curve, or in a spline curve, or in a circular arc curve, and such adjustment and change of the specific arrangement type of the curve of the second portion 31B are not departing from the principle and scope of the present invention, and should be limited within the protection scope of the present invention. In a preferred case, the first portion 31A and the second portion 31B of the windward portion 31 are each arranged in a curve, in which case the curve type of the first portion 31A and the second portion 31B may be the same, for example, the first portion 31A and the second portion 31B are each arranged in a parabolic curve. Of course, the types of curves of the first portion 31A and the second portion 31B may be different, for example, the first portion 31A is disposed in a parabolic curve, the second portion 31B is disposed in a circular arc curve, etc., and such adjustment and change to the specific arrangement type of the curves of the first portion 31A and the second portion 31B without departing from the principle and scope of the present invention should be limited within the protection scope of the present invention. Further, if the windward portion 31 includes at least three portions, in this case, only one portion of the windward portion 31 may be curved, or a plurality of portions of the windward portion 31 may be curved, or all portions of the windward portion 31 may be curved, and if a plurality of portions of the windward portion 31 are curved, the type of the curve may be one or more of a parabolic curve, a spline curve, and a circular arc curve, and such flexible adjustment and change should be limited within the scope of the present invention without departing from the principle and scope of the present invention.
Preferably, as shown in fig. 3 and 4, the first portion 31A and/or the second portion 31B of the windward portion 31 are rounded. In one possible case, the first portion 31A of the windward portion 31 is rounded, i.e. the first portion 31A is a circular arc surface and the second portion 31B is a plane; in another possible case, the second portion 31B of the windward portion 31 is rounded, that is, the second portion 31B is a circular arc surface, and the first portion 31A is a plane; in a preferred case, the first portion 31A and the second portion 31B of the windward portion 31 are rounded, that is, the first portion 31A and the second portion 31B are both arc surfaces, and by such an arrangement, the air flow can be smoothly transited, which is beneficial to reduce the generation of noise. Further, 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 portions of the windward portion 31 may be rounded, and such flexible adjustment and change should be limited within the scope of the present invention without departing from the principle and scope of the present invention.
Preferably, as shown in fig. 3 and 4, the line connecting the strong windward end 312 and the weak windward end 311 of the windward portion 31 forms an angle of 30 to 80 degrees with the horizontal plane. The angle between the line connecting the strong windward end 312 and the weak windward end 311 and the horizontal plane is the angle b in fig. 4, i.e. the angle b is 30 to 80 degrees. With such an arrangement, the gas backflow phenomenon 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 is too large, and if the cross-sectional area of the air duct is too large, the air flow cannot fill the whole air duct, and negative pressure is generated at a part without the air flow, which causes air to flow back under the action of the negative pressure. Further, if the windward portion 31 includes at least three portions, in this case, the line connecting the strong windward end 312 and the weak windward end 311 of the windward portion 31 also has an angle of 30 to 80 degrees with the horizontal plane.
As described above, according to the present invention, the windward portion 31 of the volute tongue 3 is obliquely disposed, so that the airflow at the bottom of the volute tongue 3 is firstly cut by the volute tongue 3, and the airflow at the top of the volute tongue 3 is then cut by the volute tongue 3, thereby preventing the volute tongue 3 from cutting the airflow once, and effectively reducing noise by cutting the airflow in layers. Moreover, because the gas enters from the bottom of the casing 1 and flows upwards, and flows around after impacting the impeller back disc 21, the flow of the gas at the top of the casing 1 is larger than that at the bottom of the casing 1, on the basis of this, the windward area of the windward part 31 of the volute tongue 3 of the invention is gradually increased from the weak windward end 311 (which is positioned at the bottom of the casing 1 and has small flow) to the strong windward end 312 (which is positioned at the top of the casing 1 and has large flow) of the windward part 31, the flow of the gas at the bottom of the casing 1 is small, the windward area of the windward part 31 is small, which is beneficial for intercepting, the flow of the gas at the top of the casing 1 is large, and the windward area of the windward part 31 is large, which is beneficial for improving the intercepting efficiency of the volute tongue 3 and reducing the noise.
Finally, the present invention also provides a clothes dryer including the centrifugal fan of the first embodiment or the second embodiment.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the 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.
CN201910296045.0A 2019-04-12 2019-04-12 Centrifugal fan shell, centrifugal fan and clothes dryer Pending CN111810446A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201910296045.0A CN111810446A (en) 2019-04-12 2019-04-12 Centrifugal fan shell, centrifugal fan and clothes dryer
US17/603,113 US11898575B2 (en) 2019-04-12 2020-04-08 Housing of centrifugal fan, centrifugal fan and clothes dryer
EP20787549.3A EP3954902A4 (en) 2019-04-12 2020-04-08 Housing of centrifugal fan, centrifugal fan and clothes dryer
PCT/CN2020/083765 WO2020207409A1 (en) 2019-04-12 2020-04-08 Housing of centrifugal fan, centrifugal fan and clothes dryer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910296045.0A CN111810446A (en) 2019-04-12 2019-04-12 Centrifugal fan shell, centrifugal fan and clothes dryer

Publications (1)

Publication Number Publication Date
CN111810446A true CN111810446A (en) 2020-10-23

Family

ID=72844026

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910296045.0A Pending CN111810446A (en) 2019-04-12 2019-04-12 Centrifugal fan shell, centrifugal fan and clothes dryer

Country Status (1)

Country Link
CN (1) CN111810446A (en)

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