CN117249117A - Volute, centrifugal fan and range hood - Google Patents

Volute, centrifugal fan and range hood Download PDF

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Publication number
CN117249117A
CN117249117A CN202311062930.5A CN202311062930A CN117249117A CN 117249117 A CN117249117 A CN 117249117A CN 202311062930 A CN202311062930 A CN 202311062930A CN 117249117 A CN117249117 A CN 117249117A
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CN
China
Prior art keywords
volute
control point
annular wall
flow
front cover
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
CN202311062930.5A
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Chinese (zh)
Inventor
黄瑞毅
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.)
Ningbo Fotile Kitchen Ware Co Ltd
Original Assignee
Ningbo Fotile Kitchen Ware 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 Ningbo Fotile Kitchen Ware Co Ltd filed Critical Ningbo Fotile Kitchen Ware Co Ltd
Priority to CN202311062930.5A priority Critical patent/CN117249117A/en
Publication of CN117249117A publication Critical patent/CN117249117A/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
    • F04D29/4226—Fan casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal 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
    • F04D29/40—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
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The application relates to the field of range hoods, in particular to a volute, a centrifugal fan and a range hood. The volute comprises a front cover, a rear cover, a ring wall and a flow guiding structure, wherein the front cover and the rear cover are respectively connected to two ends of the ring wall along the axial direction of the volute, and an airflow channel is formed by surrounding the front cover, the rear cover and the ring wall; the flow guiding structure is arranged on the surface of the front cover and used for guiding air flow to enter the air flow channel, the front cover is provided with an inner molded line and an outer molded line, and the outer molded line is overlapped with the molded line of the annular wall in the axial direction of the volute. The application also provides a centrifugal fan, including this spiral case, this application provides a range hood, including this centrifugal fan. The method and the device can ensure that the airflow area in each area is stable and is kept highly similar to the state of the original volute, and avoid the influence of the change of the flow velocity on the airflow performance of the volute.

Description

Volute, centrifugal fan and range hood
Technical Field
The application relates to the field of range hoods, in particular to a volute, a centrifugal fan and a range hood.
Background
The centrifugal fan is a common gas conveying device of the range hood, and the volute structure of the centrifugal fan has an important influence on the performance and efficiency of the fan. The volute is typically comprised of a front cover, a rear cover, and a surrounding wall. The front cover and the rear cover are used as important guiding surfaces for air flow entering the impeller, and have great influence on the flow and distribution of the air flow. Therefore, the optimization and improvement of the front cover are feasible research directions for improving the performance of the centrifugal fan.
In the related art, a diversion structure is added on the surface of the front cover, and airflow is guided to enter the volute through the diversion structure. However, due to the addition of the flow guiding structure, the distribution of the flow in the volute is changed, so that the flow speed of the fluid in the airflow channel of the volute is changed, and the original air performance of the volute is affected.
Disclosure of Invention
Based on the above, the application provides a volute, a centrifugal fan and a range hood, wherein the average flow velocity in the volute is close to the state of the volute.
The first technical scheme provided by the application is as follows:
the volute comprises a front cover, a rear cover, a ring wall and a flow guiding structure, wherein the front cover and the rear cover are respectively connected to two ends of the ring wall along the axial direction of the volute, and an airflow channel is formed by surrounding the front cover, the rear cover and the ring wall;
the flow guiding structure is arranged on the surface of the front cover and used for guiding air flow to enter the air flow channel, the front cover is provided with an inner molded line and an outer molded line, and the outer molded line is overlapped with the molded line of the annular wall in the axial direction of the volute; the molding method of the outer molded line comprises the following steps:
obtaining the average wall thickness P of the annular wall in the axial direction;
establishing an XY plane rectangular coordinate system by taking the circle center of the volute as an origin, wherein the XY plane rectangular coordinate system divides the appearance line into A, B, C, D areas;
obtaining the average flow rate change values of the four A, B, C, D areas and respectively marking the average flow rate change values of the four A, B, C, D areas as Q a 、Q b 、Q c 、Q d ；
Starting from the rear cover, according to Q a 、Q b 、Q c 、Q d Respectively and correspondingly obtaining average wall thickness P of middle annular wall in the axial direction of volute in A, B, C, D four areas a 、P b 、P c 、P d The method comprises the steps of carrying out a first treatment on the surface of the Wherein the flow rate variation value is in direct proportion to the average wall thickness;
fitting P with smooth curve a 、P b 、P c 、P d And obtaining the appearance line.
In one embodiment, step "P is fitted by curve a 、P b 、P c 、P d Obtaining the outline "includes:
acquisition of P a And P b Between, P b And P c Between, P c And P d The wall thickness difference between the two is denoted as # 1 ，▽ 2 ，▽ 3 ；
Selecting a control point N in the area A 1 Selecting a control point N in the area B 2 Selecting a control point N in the C area 3 Selecting a control point N in the region D 4 ；
Connecting control points N by straight lines 1 Control point N 2 The method comprises the steps of carrying out a first treatment on the surface of the To form a control line N 1 -N 2 Connecting control points N by straight lines 3 Control point N 4 To form a control line N 3 -N 4 The method comprises the steps of carrying out a first treatment on the surface of the Control line N 1 -N 2 Is intersected with the annular wall at a control point N 0 Control line N 3 -N 4 Is intersected with the annular wall at a control point N 5 ；
Acquiring the curve relation between the annular wall thickness of each control point and the corresponding angle of the annular wall thickness;
control point N is controlled by a smooth curve 0 Control point N 1 Control point N 2 Control point N 3 Control point N 4 Control point N 5 The intersections of the XY axes and the annular wall are sequentially connected.
It will be appreciated that by using a smooth curve to control point N 0 Control point N 1 Control point N 2 Control point N 3 Control point N 4 Control point N 5 The intersections of the XY axes and the annular wall are sequentially connected, so that mutation of an airflow channel is avoided, and airflow speed change is caused.
In one of themIn an embodiment, control point N 0 Control point N 1 Control point N 2 Control point N 3 Control point N 4 Control point N 5 The following equation is satisfied:
wherein H is 0 Representation point N 0 Difference from Pa, H 5 Represents N 5 Difference from Pd.
In one embodiment, H 0 Less than or equal to 10% of the initial wall thickness of the annular wall.
In one embodiment, the average flow rate of A, B, C, D four zones satisfies the following equation:
Q′ x ＝Q x +Q Lx-1 -Q Lx +Q M
wherein Q' x The average flow of the corresponding area after the diversion structure is added; q (Q) x The average flow of the corresponding area before the diversion structure is added; q (Q) Lx-1 The average flow rate guided by the diversion structure from the last area; q (Q) Lx An average flow rate directed from the region to a next region for the guided structure; q (Q) M Is directed to the air flowThe gas flow in the area increases as the gas flows enter the volute again near the air outlet of the volute.
In one embodiment, the average flow rates of the four areas A, B, C and D before the flow guiding structure is not added are respectively set to be Q 1 、Q 2 、Q 3 、Q 4 ；
Wherein P is a 、Q a Q and 1 satisfy P a ＝P*(1+2Q a /Q 1 )；
P b 、Q b Q and 2 satisfy P b ＝P*(1+2Q b /Q 2 )；
P c 、Q c Q and 3 satisfy P c ＝P*(1+2Q c /Q 3 )；
P d 、Q d Q and 4 satisfy P d ＝P*(1+2Q d /Q 4 )。
In one embodiment, the inner profile is arranged in a circular shape.
In one embodiment, the front cover is provided with an air inlet, and the inner profile satisfies the following equation:
r＝R
z＝p
θ＝360°*t
wherein R represents the radius of the inner molded line, R is the radius of the air inlet, p is the average wall thickness of the annular wall, and t is in the value range of [0,1].
The application also provides the following technical scheme:
a centrifugal fan comprises the volute.
The application also provides the following technical scheme:
a range hood comprises the centrifugal fan.
Compared with the prior art, the method has the advantages that the outer molded line of the front cover is arranged, so that the average wall thickness P of the middle annular wall in the axial direction of the volute in the A, B, C, D four areas can be realized a 、P b 、P c 、P d The two are in corresponding relation. Flow = flow velocity x cross-sectional area, so flow and flow velocityProportional to the cross-sectional area. The change of the wall thickness of the annular wall actually changes the area of the cross section of the airflow channel, and the flow rate is increased when the flow rate is increased under the condition that the cross section area is unchanged. Meanwhile, the section of the airflow channel is rectangular, the cross section of the airflow channel is=wide and high, and under the condition that the width of the airflow channel is unchanged, the average wall thickness of each area is related to the airflow, so that the stability of the airflow area in each area is ensured, the state of the airflow area is kept similar to that of the original volute, and the influence of the change of the flow velocity on the airflow performance of the volute is avoided. And in addition, the air flow can be introduced into a large-flow area by combining the flow guiding structure, so that the resistance loss and the energy waste of the air flow in a small-flow area far away from the outlet of the volute are reduced, the efficiency of the fan is improved, and the energy consumption is reduced.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings that are required to be used in the description of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic view of a volute structure provided in the present application.
Fig. 2 is a schematic diagram of a main view structure of a volute provided in the present application.
Fig. 3 is a schematic view of a bottom view structure of the volute provided in the present application.
Fig. 4 is a schematic side view of a volute provided in the present application.
FIG. 5 shows the average wall thickness P of the middle annular wall 30 in the axial direction of the volute 100 in four regions A, B, C, D provided by the present application a 、P b 、P c 、P d 。
FIG. 6P provided by the present application a And P b Between, P b And P c Between, P c And P d The wall thickness difference between the two is denoted as # 1 ，▽ 2 ，▽ 3 Is a schematic diagram of (a).
FIG. 7 this applicationPlease provide control point N 0 Control point N 1 Control point N 2 Control point N 3 Control point N 4 Control point N 5 Schematic of the location.
FIG. 8 control point N is provided herein with a smooth curve 0 Control point N 1 Control point N 2 Control point N 3 Control point N 4 Control point N 5 The XY axis and the exterior line behind the annular wall 30.
Reference numerals: 100. a volute; 101. an air flow channel; 10. a front cover; 11. an inner molded line; 12. an outer line; 13. an air inlet; 20. a rear cover; 30. an annular wall; 40. and a flow guiding structure.
Detailed Description
In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used in the description of the present application for purposes of illustration only and do not represent the only embodiment.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be a direct contact of the first feature with the second feature, or an indirect contact of the first feature with the second feature via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.
Unless defined otherwise, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. The term "and/or" as used in the specification of this application includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to 8, the present application provides a volute 100, where the volute 100 includes a front cover 10, a rear cover 20, a ring wall 30, and a flow guiding structure 40, along an axis direction of the volute 100, the front cover 10 and the rear cover 20 are respectively connected to two ends of the ring wall 30, and an airflow channel 101 is defined between the front cover 10, the rear cover 20, and the ring wall 30; the flow guiding structure 40 is mounted on the surface of the front cover 10, and is used for guiding the air flow into the air flow channel 101, the front cover 10 is provided with an inner molded line 11 and an outer molded line 12, and the outer molded line 12 coincides with the molded line of the annular wall 30 in the axial direction of the volute 100; the molding method of the outer mold line 12 includes:
step S1, obtaining the average wall thickness P of the annular wall 30 in the axial direction Z;
step S2, using the center of the volute 100 as an origin, establishing an XY plane rectangular coordinate system, and dividing the outer molded line 12 into A, B, C, D areas by the XY plane rectangular coordinate system;
step S3, obtaining average flow rate change values of the four areas A, B, C, D, and respectively marking the average flow rate change values of the four areas A, B, C, D as Q a 、Q b 、Q c 、Q d ；
Step S4, starting with the rear cover 20, according to Q a 、Q b 、Q c 、Q d Respectively and correspondingly acquiring average wall thickness P of middle annular wall 30 in axial direction of volute 100 in four areas A, B, C, D a 、P b 、P c 、P d The method comprises the steps of carrying out a first treatment on the surface of the Wherein the flow rate variation value is in direct proportion to the average wall thickness;
step S5, fitting P with a smooth curve a 、P b 、P c 、P d An outer profile 12 is obtained.
It should be noted that, the arrangement of the flow guiding structure 40 can guide more airflow to deviate towards the large flow area of the volute, so as to reduce the resistance loss and energy waste of the airflow in the small flow area far away from the outlet of the volute, thereby improving the efficiency of the fan and reducing the energy consumption. However, after the flow guiding structure 40 is arranged, due to the change of flow distribution, under the condition that the sectional area of the airflow channel 101 is unchanged, the flow speed is changed, and the original air performance of the volute is affected. By redesigning the outer profile 12 in the present application, the cross-sectional area of the air flow channel 101 and the average wall thickness P of the annular wall in the direction of the volute axis in four areas A, B, C, D are achieved a 、P b 、P c 、P d The two are in corresponding relation. The change of the wall thickness of the annular wall actually changes the area of the cross section of the airflow channel, and under the condition that the cross section area is unchanged, the flow rate is increased as the flow rate is increased according to the relation between the flow rate, the flow velocity and the cross section area. Meanwhile, the section of the airflow channel 101 is rectangular, the cross section area=wide×high of the airflow channel 101, and in the case that the width of the airflow channel 101 is unchanged, the average wall thickness of each area is related to the airflow, so that the stability of the airflow area in each area is ensured, the airflow area is kept to be similar to the state of the original volute, and the influence of the change of the flow velocity on the airflow performance of the volute is avoided. Thus, the molded outer shape 12 of the present application is securedThe flow velocity in the airflow channel 101 can be kept consistent with that of the original volute while more airflows are guided to deviate to a large flow area of the volute, so that the air performance of the volute is ensured.
It will be appreciated that the average flow rates in the four regions A, B, C, D before the addition of the flow guiding structure 40 are respectively Q 1 、Q 2 、Q 3 、Q 4 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is a 、Q a Q and 1 satisfy P a ＝P*(1+2Q a /Q 1 )；P b 、Q b Q and 2 satisfy P b ＝P*(1+2Q b /Q 2 )；P c 、Q c Q and 3 satisfy P c ＝P*(1+2Q c /Q 3 )；P d 、Q d Q and 4 satisfy P d ＝P*(1+2Q d /Q 4 )。Q a 、Q b 、Q c 、Q d The value of (2) may be positive or negative, positive or negative indicating an increase or decrease. The average sectional area of the four areas A, B, C and D can be changed to be 1+Q respectively a /Q 1 、1+Q b /Q 2 、1+Q c /Q 3 、1+Q d /Q 4 Multiple times.
Further, in one embodiment, the average flow rate of the A, B, C, D four zones satisfies the following equation:
Q′ x ＝Q x +Q Lx-1 -Q Lx +Q M
wherein Q' x To average flow in the corresponding region after addition of the flow directing structure 40; q (Q) x To average flow in the corresponding region before addition of the flow directing structure 40; q (Q) Lx-1 An average flow rate from the last region guided by the flow guiding structure 40; q (Q) Lx An average flow rate directed from that region to the next region by the flow-directed structure 40; q (Q) M An increase in the area gas flow (a decrease in drag loss, an increase in transmission efficiency, and thus an increase in the area gas flow) is caused for the gas flow to be directed near the outlet of the scroll casing 100 and then enter the scroll casing 100. For example, in region A, Q a ＝Q 1 +Q La-1 -Q La +Q M . Also, Q b 、Q c 、Q d Also, similar, the details are not repeated here.
In an embodiment, the curve in step S5 may be an archimedes curve, a logarithmic spiral curve, or the like.
Further, the step S5 specifically includes the following steps:
s51, obtaining P a And P b Between, P b And P c Between, P c And P d The wall thickness difference between the two is denoted as # 1 ，▽ 2 ，▽ 3 ；
S52, selecting a control point N in the area A 1 Selecting a control point N in the area B 2 Selecting a control point N in the C area 3 Selecting a control point N in the region D 4 ；
S53, connecting the control points N by straight lines 1 Control point N 2 The method comprises the steps of carrying out a first treatment on the surface of the To form a control line N 1 -N 2 Connecting control points N by straight lines 3 Control point N 4 To form a control line N 3 -N 4 The method comprises the steps of carrying out a first treatment on the surface of the Control line N 1 -N 2 Intersecting the extension line of (2) with the annular wall 30 at a control point N 0 Control line N 3 -N 4 Intersecting the extension line of (2) with the annular wall 30 at a control point N 5 ；
S54, obtaining the curve relation between the thickness of the annular wall 30 and the corresponding angle of each control point;
s55, using smooth curve to control point N 0 Control point N 1 Control point N 2 Control point N 3 Control point N 4 Control point N 5 The intersections of the XY axes with the annular wall 30 are connected in sequence.
It will be appreciated that by using a smooth curve to control point N 0 Control point N 1 Control point N 2 Control point N 3 Control point N 4 Control point N 5 The intersections of the XY axes and the annular wall 30 are sequentially connected, thereby avoiding abrupt changes in the airflow passage 101, causing changes in the airflow speed and loss of airflow resistance.
In one embodimentIn step S55, control point N 0 Control point N 1 Control point N 2 Control point N 3 Control point N 4 Control point N 5 The following equation is satisfied:
wherein H is 0 Representation point N 0 Difference from Pa, H 0 Is of absolute value, H 5 Represents N 5 Difference from Pd, H 5 Is an absolute value.
The five equations have 6 unknowns in total, namely H 0 、L A1 (L A2 )、L B1 (L B2 )、L C1 (L C2 )、L D1 (L D2 )、H 5 (LA 1+ LA2 = 90 °, and thus can be considered as an unknown number), H 0 At a preset value, which can be H when designing the outer profile 12 0 The values are pre-reviewed first. Thus, the five equations can solve the corresponding 5 unknowns. Here, as shown in fig. 1, the above equation is established on the principle that the areas on the left and right sides of each zone segment control point are equal.
Preferably H 0 Less than or equal to 10% of the average wall thickness P of the annular wall 30. Here, H 0 The too large value of the flow path can cause the too high change rate of the wall thickness of the volute, thereby causing unstable turbulence of the fluid in the volute, and further affecting the stability and efficiency of the fan. Therefore, in order to ensure the stability of the fluid in the volute and the normal operation of the fan, H 0 The value of (2) should not be too large.
Specifically H 0 Is of the value of H 0 ＝P*10％，H 0 ＝P*5％，H 0 =p×8% and so on. Of course, the actual value of P may be set according to the actual situation.
In one embodiment, the inner profile 11 is provided in a circular shape.
In one embodiment, the front cover 10 is provided with an air inlet 13, and the inner molded line 11 satisfies the following equation: r=r; z=p; θ=360° x t; wherein R represents the radius of the inner molded line, R is the radius of the air inlet, p is the average wall thickness of the annular wall, and t is in the value range of [0,1]. It will be appreciated that the inner profile is the circumferential line of the inlet opening 13 and is arranged such that it is a circle in a plane perpendicular to the curved surface of the annular wall 30, parallel to the impeller end surface, to stabilize the clearance between the front cover 10 and the impeller.
In this application, in order to verify the volute 100 of the centrifugal fan for a range hood provided by this application, the volute 100 of the centrifugal fan for a range hood provided by this application is tested by using the national standard GBT17713-2022 (range hood and cooking fume exhaust device) of the people's republic of China as a test standard, and the data obtained by the test are as follows:
volute type Working air quantity working condition (m 3/min) Operating noise (dB) Maximum full pressure efficiency (%)
Original volute 11 63.1 41.5
Only flow guiding structure 11 62.9 41.6
Abrupt change of flow guiding structure and annular wall thickness 11 64.7 39.1
Smooth transition of flow guiding structure and annular wall thickness 11 62.4 43.0
Original volute 12 64.6 42.0
Only flow guiding structure 12 64.3 42.2
Abrupt change of flow guiding structure and annular wall thickness 12 66.0 39.4
Flow guiding profiling and annular wall thickness smooth transition 12 63.7 43.7
Here, it should be noted that, the "original volute" is a volute where the flow guiding structure 40 is not disposed on the front cover 10. The 'only flow guiding structure' is that the flow guiding structure is added on the front cover 10 of the original volute; the 'diversion structure + annular wall thickness abrupt change' is to add a diversion structure on the original volute, and the thickness of the annular wall changes relative to the air flow, but the thickness change of the annular wall suddenly increases or decreases. The smooth transition of the flow guiding structure and the annular wall thickness is that the flow guiding structure is added on the original volute, the thickness of the annular wall changes relative air flow, and meanwhile, the changed annular wall thickness is in smooth transition connection.
It can be understood that the analysis of the table shows that under the same working air quantity working condition, the spiral case of smooth transition of the flow guiding structure and the wall thickness of the annular wall has obvious improvement of working noise and maximum full pressure efficiency.
As shown in fig. 1, the flow guiding structure 40 is provided as a flow guiding strip on the front cover 10. Here, the number of the flow guide strips may be plural, and the flow guide strips are spaced apart along the circumferential direction of the scroll casing 100.
A centrifugal fan includes a volute 100.
The application relates to a range hood, which comprises a centrifugal fan.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not thereby to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of the present application is to be determined by the following claims.

Claims (10)

1. The volute comprises a front cover, a rear cover, a ring wall and a flow guiding structure, wherein the front cover and the rear cover are respectively connected to two ends of the ring wall along the axial direction of the volute, and an airflow channel is formed by surrounding the front cover, the rear cover and the ring wall;
the flow guiding structure is arranged on the surface of the front cover and used for guiding air flow to enter the air flow channel, the front cover is provided with an inner molded line and an outer molded line, and the outer molded line is overlapped with the molded line of the annular wall in the axial direction of the volute; the molding method of the outer molded line is characterized by comprising the following steps:
obtaining the average wall thickness P of the annular wall in the axial direction;
establishing an XY plane rectangular coordinate system by taking the circle center of the volute as an origin, wherein the XY plane rectangular coordinate system divides the appearance line into A, B, C, D areas;
obtaining the average flow rate change values of the four A, B, C, D areas and respectively marking the average flow rate change values of the four A, B, C, D areas as Q a 、Q b 、Q c 、Q d ；
Starting from the rear cover, according to Q a 、Q b 、Q c 、Q d Respectively and correspondingly obtaining average wall thickness P of middle annular wall in the axial direction of volute in A, B, C, D four areas a 、P b 、P c 、P d The method comprises the steps of carrying out a first treatment on the surface of the Wherein the average flow variation value is proportional to the average wall thickness;
fitting P with a smooth curve a 、P b 、P c 、P d And obtaining the appearance line.
2. The volute of claim 1, wherein the step of "fitting P by curve a 、P b 、P c 、P d Obtaining the outline "includes:
acquisition of P a And P b Between, P b And P c Between, P c And P d The wall thickness difference between the two is denoted as # 1 ，▽ 2 ，▽ 3 ；
Selecting a control point N in the area A 1 Selecting a control point N in the area B 2 Selecting a control point N in the C area 3 Selecting a control point N in the region D 4 ；
Connecting control points N by straight lines 1 Control point N 2 The method comprises the steps of carrying out a first treatment on the surface of the To form a control line N 1 -N 2 Connecting control points N by straight lines 3 Control point N 4 To form a control line N 3 -N 4 The method comprises the steps of carrying out a first treatment on the surface of the Control line N 1 -N 2 Is intersected with the annular wall at a control point N 0 Control line N 3 -N 4 Is intersected with the annular wall at a control point N 5 ；
Acquiring the curve relation between the annular wall thickness of each control point and the corresponding angle of the annular wall thickness;
control point N is controlled by a smooth curve 0 Control point N 1 Control point N 2 Control point N 3 Control point N 4 Control point N 5 The intersections of the XY axes and the annular wall are sequentially connected.
3. The volute of claim 1, wherein the control point N 0 Control point N 1 Control point N 2 Control point N 3 Control point N 4 Control point N 5 The following equation is satisfied:
wherein H is 0 Representation point N 0 Difference from Pa, H 5 Represents N 5 Difference from Pd.
4. A volute according to claim 3, wherein H 0 Less than or equal to 10% of the initial wall thickness of the annular wall.
5. The volute of claim 1, wherein the average flow of the A, B, C, D four regions satisfies the following equation:
Q′ x ＝Q x +Q Lx-1 -Q Lx +Q M
wherein Q' x The average flow of the corresponding area after the diversion structure is added; q (Q) x The average flow of the corresponding area before the diversion structure is added; q (Q) Lx-1 The average flow rate guided by the diversion structure from the last area; q (Q) Lx An average flow rate directed from the region to a next region for the guided structure; q (Q) M An increase in the area gas flow is caused by the gas flow being directed to the vicinity of the volute outlet and then into the volute.
6. The volute of claim 1 wherein no pilot is added for four areas a, B, C, DThe average flow before the flow structure is Q 1 、Q 2 、Q 3 、Q 4 ；
Wherein P is a 、Q a Q and 1 satisfy P a ＝P*(1+2Q a /Q 1 )；
P b 、Q b Q and 2 satisfy P b ＝P*(1+2Q b /Q 2 )；
P c 、Q c Q and 3 satisfy P c ＝P*(1+2Q c /Q 3 )；
P d 、Q d Q and 4 satisfy P d ＝P*(1+2Q d /Q 4 )。
7. The volute of claim 1, wherein the inner profile is configured as a circle.
8. The volute of claim 7, wherein the front cover has an air inlet, and wherein the inner profile satisfies the following equation:
r＝R
z＝p
θ＝360°*t
wherein R represents the radius of the inner molded line, R is the radius of the air inlet, p is the average wall thickness of the annular wall, and t is in the value range of [0,1].
9. A centrifugal fan comprising a volute according to any one of claims 1-8.
10. A range hood comprising the centrifugal fan of claim 9.
CN202311062930.5A 2023-08-21 2023-08-21 Volute, centrifugal fan and range hood Pending CN117249117A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311062930.5A CN117249117A (en) 2023-08-21 2023-08-21 Volute, centrifugal fan and range hood

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311062930.5A CN117249117A (en) 2023-08-21 2023-08-21 Volute, centrifugal fan and range hood

Publications (1)

Publication Number Publication Date
CN117249117A true CN117249117A (en) 2023-12-19

Family

ID=89127178

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311062930.5A Pending CN117249117A (en) 2023-08-21 2023-08-21 Volute, centrifugal fan and range hood

Country Status (1)

Country Link
CN (1) CN117249117A (en)

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