CN107965472B - Centrifugal fan volute for range hood - Google Patents
Centrifugal fan volute for range hood Download PDFInfo
- Publication number
- CN107965472B CN107965472B CN201710318908.0A CN201710318908A CN107965472B CN 107965472 B CN107965472 B CN 107965472B CN 201710318908 A CN201710318908 A CN 201710318908A CN 107965472 B CN107965472 B CN 107965472B
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- Prior art keywords
- volute
- circular arc
- arc
- straight line
- coordinate
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- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Classifications
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- 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
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- 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
-
- 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
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a centrifugal fan volute for a range hood, which is characterized in that: the molded lines of the spiral case are formed by sequentially connecting a first straight line, a second straight line, a first circular arc, a second circular arc, a third circular arc, a fourth circular arc, a fifth circular arc, a third straight line and a fourth straight line, and adjacent straight line segments and circular arc line segments, or adjacent circular arc line segments and straight line segments are tangent at the intersection point. By optimizing the design of the molded line of the volute, the flow field in the volute can be improved, the performance (air quantity and air pressure) of a fan system can be improved, and noise can be reduced; meanwhile, the structure of the volute is improved, so that the volute is simple and stable in structure and convenient to connect with the outside.
Description
Technical Field
The invention relates to a range hood, in particular to a centrifugal fan volute for the range hood.
Background
With the change of living environment and the improvement of life quality, the requirements on the range hood are also increasing. Most fans adopted by the household range hood are multi-wing centrifugal fans for air suction and air exhaust. Centrifugal fans generally consist of a volute, a motor, an impeller, and the like. The centrifugal fan works in the principle that the motor drives the impeller to rotate to apply work to the airflow and is discharged radially through the diffusion effect of the volute.
The centrifugal fan volute is designed by adopting an approximate logarithmic spiral line or an approximate Archimedes spiral line, the volute is gradually expanded, and the design theory of the multi-wing centrifugal fan is not complete enough, so that the fan system adopted by the prior range hood is small in wind pressure and wind quantity, large in noise and difficult to meet the requirements of people.
The volute molded line of the centrifugal fan for the range hood disclosed in China patent application No. 201110118687.5 is formed by smoothly and transitionally connecting a first straight line, a first circular arc line, a second circular arc line, a spiral line and a second straight line, wherein the spiral line is a constant-speed spiral line; the volute structure of the double-sided air inlet type range hood disclosed in China patent with the application number of 201220245605.3 comprises an air outlet fixing plate, a volute front plate and a volute rear plate which are arranged in parallel, and a volute side plate used for connecting the volute front plate and the volute rear plate, wherein the volute front plate and the volute rear plate are provided with round air inlets, and the edge contour line of the volute front plate comprises a first straight line, a second straight line, a first circular arc, a second circular arc, a third straight line, a third circular arc, a fourth circular arc, a fifth circular arc, a fourth straight line and a fifth straight line which are connected in sequence; the fifth straight line is contacted with the air outlet fixing plate, and the second straight line and the third straight line are perpendicular to the fifth straight line; the outline of the volute rear plate is consistent with that of the volute front plate, and all points are in one-to-one correspondence.
The design mode of the volute inevitably causes the flow non-uniformity in each flow passage in the axial direction of the impeller, and simultaneously, the air inlet quantity at the front part of the impeller of the multi-wing centrifugal fan is far smaller than that at the middle part and the rear part of the impeller, so that vortex exists at the front part of the volute and at the back of the current collector, the two factors cause the maximum turbulent kinetic energy at the lower left corner of the volute, the flow is most disordered, and the vortex of the impeller in the flow passage at the lower left corner of the impeller is the maximum, thereby becoming one of noise sources of the multi-wing centrifugal fan.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and provides a centrifugal fan volute for a range hood, which is used for improving a flow field, improving fan performance and reducing noise.
The technical scheme adopted for solving the technical problems is as follows: a centrifugal fan spiral case for range hood, its characterized in that: the molded lines of the spiral case are formed by sequentially connecting a first straight line, a second straight line, a first circular arc, a second circular arc, a third circular arc, a fourth circular arc, a fifth circular arc, a third straight line and a fourth straight line, and adjacent straight line segments and circular arc line segments, or adjacent circular arc line segments and straight line segments are tangent at the intersection point.
Preferably, the molded line of the volute has a coordinate origin, and each straight line and the circular arc satisfying the following conditions form a datum line of the molded line:
1) Endpoint coordinates (-32.9,175.4) of the first line;
2) Endpoint coordinates (-49.6,135) of the second line;
3) The first arc is a volute tongue of the volute, the radius of the arc is 5.9, and the origin coordinate of the radius of curvature is (-44.4,132.4);
4) A second arc starting point coordinate (-42.2,127), an arc radius of 143.8, and a curvature radius origin coordinate (10.4, -6.9);
5) A third arc starting point coordinate (134.4,66), the arc radius is 167.1, and the curvature radius origin coordinate (-15.1, -8.4);
6) Fourth arc starting point coordinates (144.4, -58.5), arc radius 188.7, radius of curvature origin coordinates (-35, 0);
7) A fifth arc starting point coordinate (-174.1, -127.5), an arc radius 162.1, and a curvature radius origin coordinate (-54.6, -18);
8) A fourth line, start point coordinates (-215.2,3.7), end point coordinates (-192,175.4);
the molded line of the volute is 0.8-1.5 times of the datum line.
In order to stabilize the structure of the volute, the volute comprises a volute front cover, a volute rear cover and a volute annular wall connected between the volute front cover and the volute rear cover, wherein the volute front cover is turned back, and the volute rear cover is turned back to wrap the volute annular wall.
In order to facilitate the connection of the volute and an external pipeline through a simple structure, and reduce the cost, the volute is provided with an air outlet, and the volute front cover, the volute rear cover and the volute annular wall are outwards turned at the air outlet, and an outlet reinforcing angle is arranged at the air outlet.
In order to be convenient for fix in two directions for the spiral case can firmly install on range hood, avoids unnecessary structural vibration, the spiral case back cover is kept away from the one side welding of spiral case protecgulum has the spiral case support, spiral case support symmetry sets up in spiral case back cover near edge.
Compared with the prior art, the invention has the advantages that: by optimizing the design of the molded line of the volute, the flow field in the volute can be improved, the performance (air quantity and air pressure) of a fan system can be improved, and noise can be reduced; meanwhile, the structure of the volute is improved, so that the volute is simple and stable in structure and convenient to connect with the outside.
Drawings
FIG. 1 is a front schematic view of a volute embodiment of the invention;
FIG. 2 is a rear schematic view of a volute embodiment of the invention;
fig. 3 is a schematic line drawing of a volute embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
Referring to fig. 1 and 2, a centrifugal fan volute for a range hood includes a volute front cover 1, a volute rear cover 2, and a volute annular wall 3 connected between the volute front cover 1 and the volute rear cover 2. The volute is provided with an outlet a tuyere 4 and an air inlet 5. The volute front cover 1 is turned backwards, the volute rear cover 2 is turned forwards, and therefore the volute annular wall 3 is wrapped, and the volute front cover, the volute rear cover and the volute rear cover can be connected preferably through welding.
The volute front cover 1, the volute rear cover 2 and the volute annular wall 3 are turned outwards at the air outlet 4 and are reinforced by arranging outlet reinforcing angles 6, and the outlet reinforcing angles 6 are connected between the turned edges to form a flange for connecting the volute with an external pipeline, so that the structure is simple and the cost is low. The side of the volute rear cover 2 far away from the volute front cover 1 is welded with a volute bracket 7, and the volute bracket is symmetrically arranged at the position, close to the edge, of the volute rear cover 2, so that the volute rear cover can be fixed in two directions, the volute can be firmly installed on the range hood, and unnecessary structural vibration is avoided.
Referring to fig. 3, the volute molded lines (the volute front cover 1, the volute rear cover 2 and the volute annular wall 3 molded lines are consistent) are formed by sequentially connecting a first straight line AB, a second straight line BC, a first circular arc CD, a second circular arc DE, a third circular arc EF, a fourth circular arc FG, a fifth circular arc GH, a third straight line HI and a fourth straight line IJ. Adjacent straight line segments and arc line segments, or adjacent arc line segments and straight line segments are tangent at an intersection point, for example, a second straight line BC is tangent to a first arc CD at a point C, the first arc CD is tangent to a second arc DE at a point D, the second arc DE is tangent to a third arc EF at a point E, the third arc EF is tangent to a fourth arc FG at a point F, the fourth arc FG is tangent to a fifth arc GH at a point G, and the fifth arc GH is tangent to a third straight line HI at a point H. Through the molded line design, the flow field in the volute can be improved, the performance (air quantity and air pressure) of the fan system is improved, and noise is reduced.
Specifically, if the center O of the air inlet 5 is taken as the origin of coordinates, the X coordinate axis is transverse, and the Y coordinate axis is longitudinal, each straight line and the circular arc satisfying the following conditions form a datum line of the molded line:
1) The first straight line AB is parallel to (vertical to) the Y coordinate axis, the coordinate (-32.9,175.4) of the endpoint B point is determined according to the installation space;
2) A second straight line BC, endpoint C point coordinates (-49.6,135);
3) The first arc CD is a volute tongue of the volute, and has the main effects of preventing a part of gas from circularly flowing in the volute, improving the wind pressure and efficiency of the fan, wherein the radius of the arc is 5.9, and the origin point c point coordinate (-44.4,132.4) of the radius of curvature;
4) A second arc DE initial point coordinate D (-42.2,127), an arc radius of 143.8, and a curvature radius origin point D coordinate (10.4, -6.9);
5) A third arc EF starting point coordinate E (134.4,66), wherein the arc radius is 167.1, and the curvature radius origin E coordinate (-15.1, -8.4);
6) A fourth arc FG start point coordinate F (144.4, -58.5), arc radius 188.7, radius of curvature origin F coordinate (-35, 0);
7) A fifth arc GH start point coordinate G (-174.1, -127.5), an arc radius 162.1, and a radius of curvature origin G coordinate (-54.6, -18);
8) Fourth line HI, H point coordinates (-215.2,3.7), I point coordinates (-192,175.4).
The reference line is used for carrying out local dimension similarity design, or the dimension is adjusted to be 0.8-1.5 times, which is within the protection scope of the patent.
Claims (3)
1. A centrifugal fan spiral case for range hood, its characterized in that: the molded line of the volute is formed by sequentially connecting a first straight line (AB), a second straight line (BC), a first circular arc (CD), a second circular arc (DE), a third circular arc (EF), a fourth circular arc (FG), a fifth circular arc (GH), a third straight line (HI) and a fourth straight line (IJ), wherein adjacent straight line segments and circular arc segments, or adjacent circular arc segments and straight line segments are tangent at the intersection point;
the molded line of the volute is provided with a coordinate origin (O), and each straight line and each circular arc meeting the following conditions form a datum line of the molded line:
1) Endpoint (B) coordinates (-32.9,175.4) of the first line (AB);
2) The endpoint (C) coordinates (-49.6,135) of the second line (BC);
3) The first circular arc (CD) is a volute tongue of the volute, the radius of the circular arc is 5.9, and the origin (c) coordinate of the radius of curvature is (-44.4,132.4);
4) A second arc (DE) starting point (D) coordinate (-42.2,127), an arc radius of 143.8, and a curvature radius origin (D) coordinate (10.4, -6.9);
5) A third arc (EF) starting point (E) coordinate (134.4,66), an arc radius of 167.1 and a curvature radius origin (E) coordinate (-15.1, -8.4);
6) A fourth arc (FG) starting point (F) coordinate (144.4, -58.5), an arc radius 188.7, a radius of curvature origin (F) coordinate (-35, 0);
7) A fifth arc (GH) starting point (G) coordinate (-174.1, -127.5), an arc radius 162.1, and a radius of curvature origin (G) coordinate (-54.6, -18);
8) A fourth line (HI), start point (H) coordinates (-215.2,3.7), end point (I) coordinates (-192,175.4);
the molded line of the volute is 0.8-1.5 times of the datum line;
the spiral case includes spiral case protecgulum (1), spiral case back lid (2), connects spiral case rampart (3) between spiral case protecgulum (1) and spiral case back lid (2), the spiral case is formed with air outlet (4), spiral case protecgulum (1), spiral case back lid (2) and spiral case rampart (3) are in air outlet (4) department outwards turn-ups, and air outlet (4) set up export enhancement angle (6), export enhancement angle (6) are connected between each turn-ups.
2. The centrifugal fan volute for a range hood of claim 1, wherein: the volute front cover (1) is turned backwards, and the volute rear cover (2) is turned forwards to wrap the volute annular wall (3).
3. The centrifugal fan volute for a range hood of claim 2, wherein: one side of the volute rear cover (2) far away from the volute front cover (1) is welded with a volute bracket (7), and the volute bracket (7) is symmetrically arranged at the position, close to the edge, of the volute rear cover (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710318908.0A CN107965472B (en) | 2017-05-08 | 2017-05-08 | Centrifugal fan volute for range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710318908.0A CN107965472B (en) | 2017-05-08 | 2017-05-08 | Centrifugal fan volute for range hood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107965472A CN107965472A (en) | 2018-04-27 |
| CN107965472B true CN107965472B (en) | 2024-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710318908.0A Active CN107965472B (en) | 2017-05-08 | 2017-05-08 | Centrifugal fan volute for range hood |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110259725A (en) * | 2019-05-30 | 2019-09-20 | 宁波方太厨具有限公司 | It is a kind of for the spiral case of centrifugal blower and the method for noise reduction control of the spiral case |
| CN110454421B (en) * | 2019-07-31 | 2020-09-01 | 宁波方太厨具有限公司 | Centrifugal fan and noise reduction control method thereof |
| CN113202818B (en) * | 2021-05-21 | 2022-02-18 | 西安交通大学 | Inlet flow collecting device for centrifugal fan and centrifugal fan |
| CN114607647B (en) * | 2022-03-17 | 2023-04-11 | 惠州市艾美珈磁电技术股份有限公司 | Low-noise volute fan |
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2017
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Patent Citations (10)
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|---|---|---|---|---|
| RU70803U1 (en) * | 2007-06-14 | 2008-02-20 | Галицкий Павел Антонович | CASE OF THE FIRE CENTRIFUGAL PUMP |
| CN201184321Y (en) * | 2008-04-07 | 2009-01-21 | 佛山市南海九洲普惠风机有限公司 | Spiral casing structure of blower fan |
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| CN107965472A (en) | 2018-04-27 |
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