CN114109909B - Volute, centrifugal fan, range hood and volute generation method - Google Patents
Volute, centrifugal fan, range hood and volute generation method Download PDFInfo
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- CN114109909B CN114109909B CN202010907328.7A CN202010907328A CN114109909B CN 114109909 B CN114109909 B CN 114109909B CN 202010907328 A CN202010907328 A CN 202010907328A CN 114109909 B CN114109909 B CN 114109909B
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- volute
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- coaming
- opening
- impeller
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000008569 process Effects 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims 1
- 230000002829 reductive effect Effects 0.000 abstract description 8
- 239000000779 smoke Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000003068 static effect Effects 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
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
-
- 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
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
-
- 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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- 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
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- 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
-
- 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
- F24C15/2021—Arrangement or mounting of control or safety systems
Landscapes
- 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 invention discloses a volute, a centrifugal fan, a range hood and a generating method of the volute, wherein the volute comprises a front plate, a rear plate and a coaming, wherein the front plate and the rear plate are arranged in front of and behind the volute, the coaming is connected between the front plate and the rear plate, the front plate, the rear plate and the coaming jointly define a mounting cavity for mounting an impeller, at least one of the front plate and the rear plate is provided with an air inlet, and the coaming is provided with an air outlet communicated with the mounting cavity; wherein the coaming is a curved surface with the middle part protruding outwards. According to the technical scheme, the noise of the centrifugal fan is reduced, and the efficiency is improved.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a volute, a centrifugal fan, a range hood and a volute generation method.
Background
In the range hood, a fan is an important driving component, in the related art, due to the non-uniformity of impeller air inlet, the air flow in the centrifugal fan volute is not uniformly distributed transversely, and the air flow transversely flows, so that the air flow at the outlet of the volute generates larger vortex, energy loss is caused, and larger pneumatic noise is generated at the outlet.
Disclosure of Invention
The invention mainly aims to provide a volute, and aims to optimize the design of a volute molded line of the volute so as to improve energy efficiency and reduce noise.
In order to achieve the above purpose, the volute provided by the invention comprises a front plate, a rear plate and a coaming, wherein the front plate and the rear plate are arranged in front of and behind the volute, the coaming is connected between the front plate and the rear plate, the front plate, the rear plate and the coaming jointly define a mounting cavity for mounting an impeller, at least one of the front plate and the rear plate is provided with an air inlet, and the coaming is provided with an air outlet communicated with the mounting cavity;
wherein the coaming is a curved surface with the middle part protruding outwards.
According to the technical scheme, the coaming is designed into the curved surface structure with the middle part protruding outwards, so that in the running process of the centrifugal fan, the situation that the air inlet quantity of the middle part of the centrifugal fan is large is faced, the airflow channel of the middle part is effectively expanded through the outwards protruding curved surface structure, the middle part of the volute is fully diffused, and therefore airflow is difficult to form vortex due to transverse movement in the installation cavity and form vortex at the air outlet, ordered flow of airflow can be achieved, energy efficiency is improved, and wind noise is reduced.
Optionally, the cross section line of the inner side profile of the coaming is a volute profile, and the inner side profile of the coaming is formed by lofting and fitting the volute profile at the edge of the coaming and the volute profile in the middle of the coaming.
Optionally, in the axial direction of the volute, the dimension of the volute line in the radial direction decreases from the middle of the shroud to the edge direction.
Optionally, in the axial direction of the volute, the inner profile of the shroud is symmetrically arranged or asymmetrically arranged with a volute profile located in the middle of the volute.
Optionally, the opening of the airflow channel between the outer contour surface of the impeller and the inner side surface of the coaming increases gradually from the volute tongue on the volute to the extending direction of the air outlet.
Optionally, defining a virtual straight line vertically passing through the center of the impeller to intersect with the outer contour surface of the impeller and the inner side profile of the coaming to obtain an opening line I and an opening line III, and a virtual straight line horizontally passing through the center of the impeller to intersect with the outer contour surface of the impeller and the inner side profile of the coaming to obtain an opening line II and an opening line IV;
wherein, the opening line four/opening line three/opening line two/opening line one is: 1.42-1.72-1.9.
Optionally, each volute molded line is formed by smoothly transiting and connecting a plurality of sections of circular arcs with different radiuses.
Optionally, each of the volute lines is formed by drawing by an unequal-sided primitive method.
The invention also provides a centrifugal fan, which comprises the volute according to any embodiment.
Optionally, the centrifugal fan further comprises a check valve connected with the volute and installed at the air outlet.
The invention also provides a range hood, which comprises the centrifugal fan according to any embodiment.
The invention also provides a volute generating method, which comprises the following steps:
drawing a volute molded line in the middle of the coaming and a volute molded line at the edge of the coaming, and lofting and fitting the volute molded line in the middle of the coaming and the volute molded line at the edge of the coaming;
the radial dimension of the volute molded line in the middle of the coaming is larger than that of the volute molded line at the edge of the coaming.
Optionally, in the step of lofting and fitting the volute molded line in the middle of the coaming and the volute molded line at the edge of the coaming, a tangent line of the guide wire at the middle part of the coaming, which is adopted in the lofting and fitting process, is parallel to the rotation axis of the impeller in the volute.
Optionally, the volute profile is drawn by combining an unequal primitive method with a preset opening.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a perspective view of a centrifugal fan according to an embodiment of the invention;
FIG. 2 is a perspective view of the centrifugal fan of FIG. 1 from yet another perspective;
FIG. 3 is a perspective view of an embodiment of the volute of the present invention;
FIG. 4 is a schematic side view of the volute of FIG. 3;
FIG. 5 is a schematic cross-sectional structural view of the volute of FIG. 3;
FIG. 6 is a schematic view of a volute profile of the volute of FIG. 3;
FIG. 7 is a schematic view of yet another volute profile of the volute of FIG. 3;
fig. 8 is a schematic perspective view of a range hood according to an embodiment of the present invention.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 600 | Fume exhaust fan | 120 | Rear plate |
| 610 | Casing of machine | 130 | Coaming plate |
| 500 | Centrifugal fan | L1 | Middle volute profile |
| 400 | Check valve | L2 | Edge spiral profile |
| 300 | Wind-guiding ring | S | Air flow channel |
| 200 | Motor support | A | Opening line one |
| 100 | Volute casing | B | Opening line two |
| 100a | Air inlet | C | Opening line three |
| 100b | Air outlet | D | Opening line four |
| 110 | Front plate |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The present invention proposes a centrifugal fan 500.
In the embodiment of the present invention, as shown in fig. 1 and 2, the centrifugal fan 500 includes a scroll casing 100, an impeller (not shown), a motor (not shown), an air inlet ring and a check valve 400, the motor is fixed to the scroll casing 100 by a motor bracket 200, the impeller is disposed in the scroll casing 100, and the impeller is mounted on a driving shaft of the motor. The impeller comprises a front disc, a rear disc and a plurality of blades, wherein the front disc and the rear disc are arranged at intervals, the blades are arranged at intervals along the circumferential direction of the front disc, and the blades are respectively connected with the front disc and the rear disc. That is, the blades are circumferentially and uniformly distributed on a plane perpendicular to the front disc and the rear disc, and the blades are mutually parallel. The front disc is generally annular, and an air inlet end of the centrifugal fan 500 is located at one end of the front disc, and an air inlet ring is usually installed on the volute 100 at the front disc. The impeller can be a single-layer impeller, and for the single-layer impeller, a yielding hole for the driving shaft of the motor to extend into and be matched with is formed in the rear disc. The impeller can also be a double-layer impeller, and for the double-layer impeller, the double-layer impeller further comprises a middle disc, wherein the middle disc is positioned between the front disc and the rear disc, and a yielding hole for the driving shaft of the motor to extend into and be matched with is formed in the middle disc.
The surface of the volute 100 facing the front disc is provided with an air inlet 100a, and the air inlet 100a is taken as a main air inlet 100a; the surface of the scroll case 100 facing the rear panel is provided with another air inlet 100a. Generally, when the motor is operated at high speed, the impeller is a working component of the centrifugal fan 500, the motor is a driving source of the impeller, when the impeller is operated at high speed under the driving of the motor, a larger negative pressure area is generated in the impeller, a part of air flow enters the impeller from the main air inlet 100a under the action of pressure difference, a part of air flow enters the volute 100 from the air inlet 100a of the surface of the volute 100 towards the rear disk, and two entered air flows enter the volute 100 under the action of centrifugal force of the impeller and finally are discharged through the air outlet 100b of the volute 100.
Referring to fig. 3 to 5 in combination, in the embodiment of the present invention, the volute 100 includes a front plate 110 and a rear plate 120 disposed front and back, and a shroud 130 connected between the front plate 110 and the rear plate 120, where the front plate 110, the rear plate 120, and the shroud 130 together define an installation cavity, at least one of the front plate 110 and the rear plate 120 is provided with an air inlet 100a, and the shroud 130 is provided with an air outlet 100b; wherein the coaming 130 is a curved surface with a middle portion protruding outwards. In this embodiment, the front plate 110 and the rear plate 120 are disposed in parallel, the front plate 110 and the rear plate 120 are both provided with the air inlet 100a, and the motor can be fixed on the rear plate 120 through the motor bracket 200. The check valve 400 is connected with the coaming 130, so that the opening degree of the outlet is kept unchanged, and the air outlet effect is improved. In the above description, the shroud 130 is a curved surface with a middle portion protruding outwards, specifically, the shroud 130 passes through a vertical section, and when the section extends in the axial direction of the volute 100, the section of the shroud 130 is curved as a whole.
According to the technical scheme, the coaming 130 is designed into the curved surface structure with the middle part protruding outwards, so that in the running process of the centrifugal fan 500, the airflow channel S of the middle part is effectively expanded through the curved surface structure protruding outwards, and the middle part of the volute 100 is fully diffused, so that the airflow is difficult to form vortex in the installation cavity due to transverse movement and form vortex in the air outlet 100b, the orderly flow of the airflow can be realized, the energy efficiency is improved, and the wind noise is reduced.
Referring to fig. 6 and fig. 7 in combination, in an embodiment, a cross-sectional line of the inner profile of the shroud 130 is a profile of the volute 100, and the inner profile of the shroud 130 is formed by lofting and fitting a volute profile L2 located at an edge of the shroud 130 and a volute profile L1 located in a middle of the shroud 130. In this embodiment, when the volute 100 is taken as a section by using a vertical plane perpendicular to the rotation axis of the impeller, the section and the inner side profile of the shroud 130 will obtain a plurality of volute 100 molded lines arranged from the edge of the shroud 130 to the middle, and the inner side profile of the shroud 130 is formed by lofting and fitting the volute molded line L2 located at the edge of the shroud 130 and the volute molded line L1 located in the middle of the shroud 130, that is, the inner side profile of the shroud 130 is formed in an integral form to be a smoothly transitional curved surface.
Further, the dimension of the profile of the volute 100 in the radial direction decreases from the middle of the shroud 130 toward the edge. In this embodiment, the inner profile of the shroud 130 is gradually changed from the middle to the edges in the axial direction of the volute 100, and it is known from the above that, in the operation process of the offline fan, the air volume in the middle of the volute 100 is relatively large, and the air volumes from the middle to the two side edges are gradually reduced, so that by the above arrangement, the air flow in the volute 100 is gradually diffused in the axial direction of the volute 100, and the strong transverse air flow generated by the volute 100 is not led out to form a vortex, so that the noise reduction effect is good.
In one embodiment, the inner profile of the shroud 130 is symmetrically disposed or asymmetrically disposed about a volute line L1 located in the middle of the volute 100. When the inner side profile of the shroud 130 is symmetrically disposed with respect to the volute line L1 located in the middle of the volute 100, the manufacturing is relatively easy. Under the condition of having two air inlets 100a, the air inlet 100a provided with the motor bracket 200 for installing the motor has an air inlet smaller than that of the other side, the curve of the inner side surface of the coaming 130 corresponding to one side with large air inlet is larger than that of the curve of the inner side surface of the coaming 130 corresponding to one side with small air inlet by taking the volute molded line L1 in the middle of the volute 100 as a boundary, so that the flow and diffusion requirements are considered, and the internal balance is achieved, so that the possibility of generating transverse vortex in the volute 100 is reduced.
In an embodiment, the opening of the air flow channel S between the outer profile surface of the impeller and the inner profile surface of the shroud 130 increases gradually from the tongue of the volute 100 to the extension direction of the air outlet 100 b. There are several significant design drawbacks to the existing volute 100 designs, which have the form of straight wall surfaces: the airflow flowing from the volute tongue to the air outlet 100b is reduced in opening degree, the diffusion degree is negative, backflow in the volute tongue neighborhood is easy to cause under high static pressure to enter the volute 100, useless diffusion is carried out, the volume of an airflow channel S of the volute 100 is occupied, air inlet is affected, and the efficiency of a fan is reduced.
Further, referring to fig. 7, a virtual straight line vertically passing through the center of the impeller intersects with the outer contour surface of the impeller and the inner side surface of the shroud 130 to obtain an opening line a and an opening line tri C, and a virtual straight line horizontally passing through the center of the impeller intersects with the outer contour surface of the impeller and the inner side surface of the shroud 130 to obtain an opening line B and an opening line tetra D;
opening line four D/opening line three C-opening line three C/opening line two B-opening line two B/opening line one A is: 1.42-1.72-1.9.
According to the method, the opening design is carried out according to the ratio, after the opening of each section is determined according to the recommended value, the curve is freely selected to carry out the point fitting, so that the curvature change of the volute 100 molded line is ensured to be too severe, and the noise can be reduced.
Further, on the basis of designing the molded line of the volute 100 by taking the opening as a variable, in order to further ensure that the curvature change of the molded line of the volute 100 is not too severe, the multi-section circular arc fitting is adopted, so that the inner side molded surface of the coaming 130 has smaller resistance in the airflow flowing process, thereby improving the efficiency and reducing the noise.
The invention also provides a volute 100 generating method, which comprises the following steps:
drawing a volute molded line L1 in the middle of the coaming 130 and a volute molded line L2 at the edge of the coaming 130, and lofting and fitting the volute molded line L1 in the middle of the coaming 130 and the volute molded line L2 at the edge of the coaming;
wherein the radial dimension of the volute line L1 in the middle of the shroud 130 is greater than the radial dimension of the volute line L2 at the edge of the shroud 130.
In the step of lofting and fitting the volute molded line L1 in the middle of the shroud 130 and the volute molded line L2 at the edge of the shroud 130, a tangent line of the guide wire at the middle part of the shroud 130, which is adopted in the lofting and fitting process, is parallel to the rotation axis of the impeller in the volute 100.
The method for generating the volute 100 mainly comprises the steps of forming a coaming 130 structure, and drawing the volute molded line L1 in the middle of the coaming 130 and the volute molded line L2 at the edge of the coaming 130, wherein the volute molded line 100 is drawn by combining an unequal primitive method with a preset opening. The molded line at the middle disc is determined by the DOE preferentially, and then the molded lines at the upper bottom surface and the lower bottom surface are perfected through iterative design, so that the molded line of the volute 100 with each section in the process needs to meet the requirement that the airflow channel S of the volute 100 presents a full-section gradually-expanding shape. The size of the molded line close to the middle disc is larger, the size of the molded line close to the upper bottom surface and the lower bottom surface is relatively smaller, and the relative opening between the two molded lines is required to be distributed in a gradually-expanding shape or an equidistant shape. Further, the volute 100 molded line is drawn by combining an unequal primitive method with a preset opening.
Specifically, in designing the volute 100 profile in the scalene primitive method, it is possible to use:
a is obtained from the above 0.5π 、A π 、A 1.5π 、A 2π The method comprises the steps of carrying out a first treatment on the surface of the Wherein m is a parameter related to the nature of the fluid, R 2 Is the impeller radius.
And taking the center of the impeller as the center of a square, and making four squares with different side lengths, namely the unequal-side primitives.
Starting from point P, four corners of the primitive are used as circle centers, and R is used in turn a 、R b 、R c 、R d The radius is rounded to form a line of the inner wall surface of the shroud 130 of the scroll casing 100. Wherein:
R a ＝R 2 +A 2π -a R b ＝R 2 +A 1.5π -b；
R c ＝R 2 +A π -c R d ＝R 2 +A 0.5π -d。
in the above design, a forward design method may be adopted, that is, from the first section of arc at the connection of the volute tongue to the fourth section of arc connected with the diffuser of the air outlet 100b, for the unequal-sided primitive, the side length growth rates b-a, c-b and d-c are controllable and may show different growth rate change trends, and the four sections of arc length of the volute 100 applying the method has different second order change characteristics. The profile of the scalene cell volute 100 may also be adjusted. However, in practical production and life, the size limitation affects the forward design, and in particular, the width of the multi-wing centrifugal fan 500 for the range hood 600 is often limited. The reverse design concept based on size constraints can be considered at this time. The reverse design volute 100 profile is drawn in the opposite direction to the forward design, and the drawing is selected from the size limitation of the last arc on the left side, and the fourth to first volute 100 profile is in sequence. In this case, the volute 100 profile, which is positive in second order, is no longer the profile with the greatest volume. The radius increasing amplitude of the forward design is reflected to the radius decreasing amplitude in the reverse design, so when the fourth section of circular arc size limitation is reversely drawn by taking the fourth section of circular arc size limitation as a starting point, the second order is negative, the reduction degree of the radius of the volute 100 is smaller, and the macro appearance is that the volume of the volute 100 is larger.
Referring to fig. 8, the present invention further provides a range hood 600, where the range hood 600 includes a casing 610 and a centrifugal fan 500, the casing 610 has a smoke suction port and a smoke exhaust port, and a smoke exhaust channel communicating the smoke suction port and the smoke exhaust port, and the centrifugal fan 500 is located in the smoke exhaust channel, and the specific structure of the centrifugal fan 500 refers to the above embodiment, and the range hood 600 of the present application adopts all the technical solutions of all the embodiments, and the specific structure of the centrifugal fan 500 refers to the above embodiment, and because the range hood 600 adopts all the technical solutions of all the embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be repeated herein.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (12)
1. The volute is characterized by comprising a front plate, a rear plate and a coaming, wherein the front plate and the rear plate are arranged in front of and behind the volute, the coaming is connected between the front plate and the rear plate, the front plate, the rear plate and the coaming jointly define a mounting cavity for mounting an impeller, and an air outlet communicated with the mounting cavity is formed in the coaming;
wherein the coaming is a curved surface with the middle part protruding outwards;
in the axial direction of the volute, the inner side profile of the coaming is asymmetrically arranged with a volute molded line positioned in the middle of the volute, wherein the curved surface curvature of the inner side profile close to the front plate is larger than that of the inner side profile close to the rear plate;
the front plate and the rear plate are both provided with air inlets;
the rear plate is used for connecting a motor bracket;
defining a virtual straight line vertically passing through the center of the impeller to intersect with the outer contour surface of the impeller and the inner side profile of the coaming to obtain an opening line I and an opening line III, and a virtual straight line horizontally passing through the center of the impeller to intersect with the outer contour surface of the impeller and the inner side profile of the coaming to obtain an opening line II and an opening line IV;
the ratio of the opening line four corresponding position to the opening of the opening line three corresponding position is 1.42, the ratio of the opening line three corresponding position to the opening of the opening line two corresponding position is 1.72, and the ratio of the opening line two corresponding position to the opening of the opening line one corresponding position is 1.9.
2. A spiral casing according to claim 1 wherein the cross-sectional line of the inboard profile of the shroud is a spiral casing profile, the inboard profile of the shroud being formed by a loft fit of the spiral casing profile at the edge of the shroud and the spiral casing profile intermediate the shroud.
3. A volute according to claim 2, wherein the dimension of the volute line in the radial direction decreases from the middle of the shroud towards the edge in the axial direction of the volute.
4. A volute according to any one of claims 2 to 3 wherein the opening of the airflow path between the outer contoured surface of the impeller and the inner contoured surface of the shroud increases progressively from a tongue on the volute to the direction of extension of the air outlet.
5. A spiral casing as in claim 4, wherein each of said spiral casing contours comprises a smooth transition of a plurality of arcuate lines of different radii.
6. A spiral casing as claimed in claim 4, wherein each of said spiral casing contours is drawn by an inequality primitive method.
7. A centrifugal fan comprising a volute according to any one of claims 1 to 6.
8. The centrifugal fan of claim 7, further comprising a check valve connected to the volute and mounted at the air outlet.
9. A range hood comprising a centrifugal fan as claimed in claim 7 or 8.
10. A method of volute generation, the method comprising the steps of:
drawing a volute molded line in the middle of the coaming and a volute molded line at the edge of the coaming, and lofting and fitting the volute molded line in the middle of the coaming and the volute molded line at the edge of the coaming;
the radial dimension of the volute molded line in the middle of the coaming is larger than that of the volute molded line at the edge of the coaming;
the front plate of the volute and the rear plate of the volute are both provided with air inlets;
the rear plate is used for connecting a motor bracket;
in the axial direction of the volute, the inner side profile of the coaming is asymmetrically arranged with a volute molded line positioned in the middle of the volute, wherein the curved surface curvature of the inner side profile close to the front plate is larger than that of the inner side profile close to the rear plate;
defining a virtual straight line vertically passing through the center of the impeller to intersect with the outer contour surface of the impeller and the inner side profile of the coaming to obtain an opening line I and an opening line III, and a virtual straight line horizontally passing through the center of the impeller to intersect with the outer contour surface of the impeller and the inner side profile of the coaming to obtain an opening line II and an opening line IV;
the ratio of the opening line four corresponding position to the opening of the opening line three corresponding position is 1.42, the ratio of the opening line three corresponding position to the opening of the opening line two corresponding position is 1.72, and the ratio of the opening line two corresponding position to the opening of the opening line one corresponding position is 1.9.
11. The method of generating a volute casing according to claim 10, wherein in the step of fitting the volute casing line in the middle of the shroud and the volute casing line at the edge of the shroud, a tangent line of a guide wire at the middle of the shroud used in the fitting process is parallel to the rotation axis of the impeller in the volute casing.
12. The volute generating method of claim 10, wherein the volute line is drawn by an inequality primitive method in combination with a preset opening.
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| CN114109909A (en) | 2022-03-01 |
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