CN112780599A - Centrifugal fan and cooking utensil - Google Patents
Centrifugal fan and cooking utensil Download PDFInfo
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- CN112780599A CN112780599A CN202011638814.XA CN202011638814A CN112780599A CN 112780599 A CN112780599 A CN 112780599A CN 202011638814 A CN202011638814 A CN 202011638814A CN 112780599 A CN112780599 A CN 112780599A
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- 238000010411 cooking Methods 0.000 title claims abstract description 12
- 230000004323 axial length Effects 0.000 claims abstract description 63
- 238000009434 installation Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000002457 bidirectional effect Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 8
- 230000003014 reinforcing effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 230000011218 segmentation Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/163—Combinations of two or more pumps ; Producing two or more separate gas flows driven by a common gearing arrangement
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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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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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
- F04D29/424—Double entry casings
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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
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention belongs to the technical field of fans, and particularly relates to a centrifugal fan and a cooking appliance, wherein the centrifugal fan comprises a shell, a driving assembly and at least two impellers, a first air inlet, a second air inlet and an air outlet are formed in the shell, the driving assembly is connected to the shell and close to the second air inlet, each impeller comprises a hub, a first section body and a second section body, the hubs are connected to the driving assembly, the first section body and the second section body are respectively connected to two sides of the hubs, the second section body is close to the driving assembly, and the ratio of the axial length of the first section body to the axial length of the second section body is 1.0-2.5. According to the centrifugal fan disclosed by the embodiment of the invention, under the action of the driving assembly, bidirectional air inlet and unidirectional air outlet are realized. The axial lengths of the impeller at different positions are adjusted, so that the acting of the impeller can be maximized, the effective acting length is increased, the air quantity and the efficiency of the centrifugal fan are increased, and the centrifugal fan is beneficial to realizing the compactness and the miniaturization of the centrifugal fan.
Description
Technical Field
The invention belongs to the technical field of fans, and particularly relates to a centrifugal fan and a cooking appliance.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
Compared with the traditional centrifugal fan, the multi-wing centrifugal fan generally adopts double-side inlets and has larger impeller width, but is limited by the inlet width, the performance of the motor cannot be developed to the maximum extent, the impeller width cannot be expanded infinitely, and otherwise, the effect of increasing the flow cannot be achieved.
The OTR (over the range) microwave oven is a microwave oven having a range hood function, and is generally suspended above a cooking range to absorb smoke, water vapor, and the like generated by the cooking range below the microwave oven during heating. The OTR microwave oven is provided with a fan for absorbing oil smoke, the fan mostly adopts a multi-wing centrifugal impeller, the external dimension of the OTR microwave oven is certain, the cavity volume of the OTR microwave oven is one of important indexes, the diameter of the multi-wing centrifugal impeller is the most important factor for limiting the cavity volume, the ratio of the external diameter of the centrifugal impeller to the width of the impeller is generally recommended to be 0.4-0.6 in design, otherwise, the efficiency of the fan is lowered. Due to the installation structure of the OTR, the air inlet amount and the air suction amount are small and the oil smoke absorption effect is poor under the condition that the diameter of the fan is not changed.
Disclosure of Invention
The invention aims to at least solve the problems of small air intake and air suction amount and poor oil fume suction effect under the condition of unchanged fan diameter in the prior art. The purpose is realized by the following technical scheme:
a first aspect of the present invention provides a centrifugal fan including:
the air conditioner comprises a shell, a first air inlet, a second air inlet and an air outlet are arranged on the shell, and the air outlet is positioned between the first air inlet and the second air inlet;
the driving assembly is connected to the shell and is close to the second air inlet;
at least two impellers, each the impeller all includes wheel hub, the first section body and the second section body, wheel hub connects on the drive assembly, and the first section body and the second section body are connected respectively in wheel hub's both sides, the second section body is close to the drive assembly sets up, the axial length of the first section body with the axial length's of the second section body ratio is between 1.0-2.5.
According to the centrifugal fan disclosed by the embodiment of the invention, the centrifugal fan is suitable for any equipment needing ventilation, such as a microwave oven, an oven, a range hood, an air conditioner, a ventilation fan and the like. Realize the drive to two at least impellers through a drive assembly, improved centrifugal fan's whole air output and air-out efficiency, need not to adopt the drive assembly of more high-power or volume, change from the impeller in quantity, also need not to change centrifugal impeller's width, under the prerequisite of guaranteeing original external diameter width ratio also the optimum dimension's of assurance impeller prerequisite, reduced centrifugal fan's cost, improved centrifugal fan's whole air output and air-out efficiency. Specifically, the structure of two impellers is the same, and each impeller all includes wheel hub, the first section body and the second section body, and wheel hub connects on drive assembly, and wheel hub drives wheel hub motion through drive assembly in order to realize the rotation of impeller as impeller and drive assembly's coupling part. The impeller comprises a shell, and is characterized in that a first air inlet, a second air inlet and an air outlet are arranged on the shell, the impeller further comprises a first section body and a second section body, the first section body and the second section body are respectively positioned on two sides of the hub, air flow entering from the first air inlet enters the first section body and then flows out of the air outlet, air flow entering from the second air inlet enters the second section body and then flows out of the air outlet. Under drive assembly's effect, the air current in the external world enters into first section body and second section body from first air intake and second air intake simultaneously, flows out from the air outlet behind first section body and the second section body, realizes two-way air inlet through first air intake and second air intake, realizes one-way air-out through the air outlet, has further increased centrifugal fan's air input and air output. The drive assembly is connected to the housing, which serves as a mounting base for the drive assembly to provide a stable power output for the at least two impellers. At least two impellers can be connected on one side of the driving assembly in a serial upstream and downstream relationship, can also be connected on one side of the driving assembly in a parallel relationship, and can also be two independent impellers which are connected on two sides of the driving assembly in a mutual noninterference relationship. In order to ensure that the overall size of the centrifugal fan is not too large, the driving assembly is arranged to be close to the second air inlet, so that the driving assembly can influence the air inlet volume of the second air inlet. A balance point is found among the air inlet volume, the air outlet volume and the size of the centrifugal fan, so that the performance of the centrifugal fan in all aspects is optimal, therefore, the axial length of the first section body and the axial length of the second section body are improved, and in the prior art, the impeller is in a symmetrical structure. In the embodiment of the present invention, the axial length of the second segment is greater than that of the first segment, that is, the axial length of the second segment close to the driving assembly is smaller than that far from the first segment. The axial length of the impeller at different positions is adjusted to adapt to the structure of the centrifugal fan. Wheel hub encloses with first section body and closes and form the first chamber that holds, and wheel hub encloses with the second section body and closes and form the second and hold the chamber, and the second holds the size in chamber and is less than the first size that holds the chamber, and in the same time, the first chamber that holds can carry more air currents, and the intake that is exactly the first section body, air output and air-out efficiency all are greater than the second section body. The impeller is designed in a segmented mode, the axial length of the impeller is different, the acting of the impeller can be maximized, the effective acting length is increased, the air quantity and the efficiency of the centrifugal fan are increased, and the compactness and the miniaturization of the centrifugal fan are facilitated. After balancing the air inlet amount, the air outlet amount, the efficiency and the volume, the ratio of the axial length of the first section body to the axial length of the second section body is between 1.0 and 2.5. When the ratio is selected between 1.0 and 2.5, the condition that the axial length of the first section body and the axial length of the second section body are not greatly different can be ensured, so that the ratio of the outer diameter of the first section body to the axial length and the ratio of the outer diameter of the second section body to the axial length are close to 0.4 to 0.6 as much as possible, and the operation performance of the centrifugal fan is ensured.
In some embodiments of the invention, the first segment has an axial length of 55-153mm and the second segment has an axial length of 30-60 mm.
In some embodiments of the invention, the first segment has an axial length of 83mm and the second segment has an axial length of 60 mm.
In some embodiments of the present invention, the first segment includes a first fixing member and a plurality of first blades, the plurality of first blades are disposed between the hub and the first fixing member, and the first blades face the first air inlet;
the second segment body comprises a second fixing piece and a plurality of second blades, the second blades are arranged between the hub and the second fixing piece and face the second air inlet, and the ratio of the axial length of the first blades to the axial length of the second blades is 1.0-2.5.
In some embodiments of the present invention, a distance between the driving assembly and the second air inlet is greater than or equal to 15 mm.
In some embodiments of the invention, the first blade and the second blade each comprise:
the inlet section faces the first air inlet;
an intermediate section connected to and downstream of the inlet section;
the two ends of the rear section are respectively connected with the middle section and the hub, the ratio of the inner diameter to the outer diameter of the inlet section is larger than that of the middle section, and the ratio of the inner diameter to the outer diameter of the middle section is larger than that of the rear section.
In some embodiments of the invention, the ratio of the inner and outer diameters of the inlet section is 0.85 to 0.90, the ratio of the inner and outer diameters of the intermediate section is 0.80 to 0.85, and the ratio of the inner and outer diameters of the rear section is 0.70 to 0.80.
In some embodiments of the invention, the inlet setting angle of the inlet section is 60 ° to 80 °, the outlet setting angle is 0 ° to 25 °, the inlet setting angle of the middle section and the rear section is 70 ° to 90 °, and the outlet setting angle is 0 ° to 30 °.
In some embodiments of the present invention, the at least two impellers include a first impeller and a second impeller, the housing includes a first volute and a second volute, the first volute and the second volute each have the first air inlet, the second air inlet, and the air outlet, the drive assembly is located between the first volute and the second volute, the first impeller is located within the first volute, and the second impeller is located within the second volute.
A second aspect of the present invention provides a cooking appliance, including the centrifugal fan in any one of the above technical solutions.
The cooking appliance of the embodiment of the invention has the same beneficial effects as the centrifugal fan in the embodiment, and the description is omitted.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic structural diagram of a centrifugal fan according to an embodiment of the present invention;
FIG. 2 is an exploded view of FIG. 1;
FIG. 3 is a front view of FIG. 1;
FIG. 4 is a perspective view of the first impeller shown in FIG. 3;
FIG. 5 is a front view of FIG. 4;
FIG. 6 is a cross-sectional view of FIG. 3;
fig. 7 is a schematic view of the first blade shown in fig. 6.
The reference symbols in the drawings denote the following:
1. a housing; 11. a first volute; 12. a second volute; 13. a first air inlet; 14. a second air inlet; 15. an air outlet;
2. a first impeller; 21. a hub; 22. a first segment; 23. a second segment; 24. a third fixing member; 221. a first fixing member; 222. a first blade; 231. a second fixing member; 232. a second blade; 2221. An inlet section; 2222. a middle section; 2223. a rear section;
3. a second impeller;
4. a drive assembly; 41. a drive member; 42. a first drive shaft; 43. a second drive shaft.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1 to 7, a centrifugal fan according to an embodiment of the present invention includes:
the air conditioner comprises a shell 1, wherein a first air inlet 13, a second air inlet 14 and an air outlet 15 are formed in the shell 1, and the air outlet 15 is positioned between the first air inlet 13 and the second air inlet 14;
the driving assembly 4 is connected to the shell 1 and is close to the second air inlet 14;
at least two impellers, each impeller all includes wheel hub 21, first section body 22 and second section body 23, and wheel hub 21 is connected on drive assembly 4, and first section body 22 and second section body 23 are connected respectively in the both sides of wheel hub 21, and second section body 23 is close to drive assembly 4 and sets up, and the axial length of first section body 22 and the axial length of second section body 23 ratio are between 1.0-2.5.
According to the centrifugal fan disclosed by the embodiment of the invention, the centrifugal fan is suitable for any equipment needing ventilation, such as a microwave oven, an oven, a range hood, an air conditioner, a ventilation fan and the like. Realize the drive to two at least impellers through a drive assembly 4, improved centrifugal fan's whole air output and air-out efficiency, need not to adopt the drive assembly 4 of more high power or volume, change from the impeller is in quantity, also need not to change centrifugal impeller's width, under the prerequisite of guaranteeing original external diameter width ratio also the optimum dimension's of assurance impeller prerequisite, reduced centrifugal fan's cost, improved centrifugal fan's whole air output and air-out efficiency. Specifically, the two impellers have the same structure, each impeller comprises a hub 21, a first segment 22 and a second segment 23, the hub 21 is connected to the driving assembly 4, the hub 21 serves as a connecting part of the impeller and the driving assembly 4, and the driving assembly 4 drives the hub 21 to move so as to realize rotation of the impeller. The casing 1 is provided with a first air inlet 13, a second air inlet 14 and an air outlet 15, the impeller further comprises a first section 22 and a second section 23, the first section 22 and the second section 23 are respectively positioned at two sides of the hub 21, air flow entering from the first air inlet 13 enters the first section 22 and then flows out from the air outlet 15, air flow entering from the second air inlet 14 enters the second section 23 and then flows out from the air outlet 15. Under the effect of drive assembly 4, the air current in the external world enters into first section body 22 and second section body 23 from first air intake 13 and second air intake 14 simultaneously, flows out from air outlet 15 behind first section body 22 and the second section body 23, realizes two-way air inlet through first air intake 13 and second air intake 14, realizes one-way air-out through air outlet 15, has further increased centrifugal fan's air input and air output. The drive assembly 4 is connected to the housing 1, and the housing 1 serves as a mounting base for the drive assembly 4 to provide a stable power output for at least two impellers. At least two impellers can be connected on one side of the driving assembly 4 in series upstream and downstream relation, can also be connected on one side of the driving assembly 4 in parallel relation, and can also be two independent impellers which are connected on two sides of the driving assembly 4 in a mutual noninterference relation. In order to ensure that the overall size of the centrifugal fan is not too large, the driving assembly 4 is disposed close to the second air inlet 14, so that the driving assembly 4 may affect the air inlet amount of the second air inlet 14. A balance point is found among the air inlet volume, the air outlet volume and the size of the centrifugal fan, so that the performance of the centrifugal fan in all aspects is optimal, therefore, the axial length of the first section body 22 and the axial length of the second section body 23 are improved, and in the prior art, the impeller is in a symmetrical structure. In the present embodiment, the axial length of the second segment 23 is greater than the axial length of the first segment 22, that is, the axial length of the second segment 23 near the driving assembly 4 is smaller than the axial length far from the first segment 22. The axial length of the impeller at different positions is adjusted to adapt to the structure of the centrifugal fan. Wheel hub 21 encloses with first section body 22 and closes and form the first chamber that holds, and wheel hub 21 encloses with second section body 23 and closes and form the second and hold the chamber, and the second holds the size in chamber and is less than the first size that holds the chamber, and in the same time, the first chamber that holds can carry more air currents, and the intake, the air output and the air-out efficiency that also are first section body 22 all are greater than second section body 23. The impeller is designed in a segmented mode, the axial length of the impeller is different, the acting of the impeller can be maximized, the effective acting length is increased, the air quantity and the efficiency of the centrifugal fan are increased, and the compactness and the miniaturization of the centrifugal fan are facilitated. The ratio of the outer diameter to the axial length of the conventional impeller is between 0.4 and 0.6, and the air quantity and the efficiency of the impeller are reduced when the ratio is beyond the range. Therefore, after balancing the intake air amount, the exhaust air amount, the efficiency and the volume, the ratio of the axial length of the first segment body 22 to the axial length of the second segment body 23 is between 1.0 and 2.5. When the ratio is selected from 1.0-2.5, the axial length of the first section 22 and the axial length of the second section 23 can be ensured not to be greatly different, so that the ratio of the outer diameter of the first section 22 to the axial length and the ratio of the outer diameter of the second section 23 to the axial length are close to 0.4-0.6 as much as possible, and the operation performance of the centrifugal fan is ensured.
It should be noted that, the rotation of at least two impellers is realized by the driving assembly 4, and the rotation speeds of the impellers in at least two impellers may be set to be the same or different.
In some embodiments of the invention, at least two impellers are included in embodiments of the invention. When two impellers are included, the two impellers may be connected to one side of the driving assembly 4 in a serial upstream and downstream relationship, may be connected to one side of the driving assembly 4 in a parallel relationship, or may be two independent impellers connected to both sides of the driving assembly 4 in a relationship not affecting each other. When the three impellers are included, the three impellers can be connected to one side of the driving assembly 4 in a serial upstream and downstream relationship, can also be connected to one side of the driving assembly 4 in a parallel relationship, and can also be two independent impellers, the three impellers are connected to two sides of the driving assembly 4 in a mutual-influencing relationship, and the other impeller is connected to one side of the driving assembly 4 in a serial or parallel relationship, so that a structure that one side is provided with two impellers and one side is provided with one impeller is formed. When four or more impellers are included, the arrangement of two or three impellers can be referred to, and details are not repeated here. As shown in fig. 1-3 and 6, in one embodiment, two impellers are included. The at least two impellers comprise a first impeller 2 and a second impeller 3, the first impeller 2 and the second impeller 3 are identical in structure, the first impeller 2 comprises a hub 21, a first section 22 and a second section 23, the second impeller 3 comprises a hub 21, a first section 22 and a second section 23, and the first section 22 and the second section 23 in the first impeller 2 and the second impeller 3 are arranged in the size arrangement mode, namely the arrangement mode mentioned above.
In some embodiments of the present invention, to facilitate the arrangement and installation of the first impeller 2 and the second impeller 3, as shown in fig. 1 to 3 and 6, the housing 1 includes a first volute 11 and a second volute 12, the first volute 11 is provided with a first air inlet 13, a second air inlet 14 and an air outlet 15, the first impeller 2 is located in the first volute 11, for the first impeller 2, the first volute 11 is provided with two air inlets and one air outlet 15, which are respectively the first air inlet 13, the second air inlet 14 and the air outlet 15, under the action of the driving assembly 4, the first impeller 2 realizes bidirectional air inlet through the first air inlet 13 and the second air inlet 14, realizes unidirectional air outlet through the air outlet 15, and further increases the air inlet volume and the air outlet volume of the centrifugal fan. The structure of the first volute 11 is completely the same as that of the second volute 12, the second volute 12 is also provided with a first air inlet 13, a second air inlet 14 and an air outlet 15, the second impeller 3 is located in the second volute 12, for the second impeller 3, the second volute 12 is provided with two air inlets and one air outlet 15 which are respectively the first air inlet 13, the second air inlet 14 and the air outlet 15, under the action of the driving component 4, the second impeller 3 and the second impeller 3 realize bidirectional air inlet through the first air inlet 13 and the second air inlet 14, and realize unidirectional air outlet through the air outlet 15, so that the air inlet amount and the air outlet amount of the centrifugal fan are further increased, and the second air inlet 14 of the first volute 11 is opposite to the second air inlet 14 of the second volute 12. The driving assembly 4 is located between the first volute 11 and the second volute 12, and is connected to the first volute 11 and the second volute 12, and the distance between the driving assembly 4 and the second air inlet 14 of the first volute 11 and the distance between the driving assembly 4 and the second air inlet 14 of the second volute 12. To a certain extent, the size of the distance affects the intake air volume of the second intake opening 14, that is, the intake air volume, the outtake air volume and the efficiency of the second segment 23 of the first impeller 2 and the second segment 23 of the second impeller 3.
In some embodiments of the present invention, according to the foregoing, the distance between the driving assembly 4 and the second air inlet 14 of the first scroll casing 11 and the distance between the driving assembly 4 and the second air inlet 14 of the second scroll casing 12 affect the air inlet amount of the second air inlet 14 to a certain extent, and the magnitude of the distance is positively correlated to the magnitude of the air inlet amount and negatively correlated to the volume of the centrifugal fan. Therefore, the volume of the centrifugal fan and the whole air inlet volume of the centrifugal fan need to be balanced. In one embodiment, the distance between the second air inlet 14 of the first volute 11 and the distance between the driving assembly 4 and the second air inlet 14 of the second volute 12 is greater than or equal to 15 mm.
In some embodiments of the present invention, in one embodiment, the rotation speed of the first impeller 2 is the same as that of the second impeller 3, so as to achieve uniform wind outlet. The drive assembly 4 drives the first impeller 2 and the second impeller 3 synchronously, and the first impeller 2 and the second impeller 3 may share one drive member 41, or the first impeller 2 and the second impeller 3 may be driven by two drive members 41 separately, in one embodiment, as shown in fig. 1 to 3 and 6, the first impeller 2 and the second impeller 3 share one drive member 41. The drive assembly 4 comprises a driver 41, a first drive shaft 42 and a second drive shaft 43, the first drive shaft 42 and the second drive shaft 43 being located on either side of the driver 41. Furthermore, the first volute 11 and the second volute 12 are symmetrical with respect to the driving assembly 4, that is, the first impeller 2 and the second impeller 3 are symmetrical with respect to the driving assembly 4, and the first impeller 2 and the second impeller 3 are respectively connected to two sides of the driving assembly 4. In one embodiment, the drive member 41 is a motor, the first impeller 2 is connected to a first drive shaft 42, and the second impeller 3 is connected to a second drive shaft 43.
In some embodiments of the present invention, in one embodiment, the first segment 22 has an axial length of 55-153mm and the second segment 23 has an axial length of 30-60 mm. More specifically, the axial length of the first segment 22 is 83mm, and the axial length of the second segment 23 is 60 mm. The outer diameters of the first section body 22 and the second section body 23 are the same and are both 85mm, the inner diameters of the first section body 22 and the second section body 23 are the same and are both 70mm, and the maximum outer diameter of the shell 1 is 107 mm.
In some embodiments of the present invention, the specific structure of the first segment 22 and the second segment 23 will be described below. As shown in fig. 1 to 3 and 6, the first segment 22 includes a first fixing member 221 and a plurality of first blades 222, the plurality of first blades 222 are uniformly arranged between the hub 21 and the first fixing member 221 at intervals, and the first blades 222 face the first air inlet 13. The second segment 23 includes a second fixing member 231 and a plurality of second blades 232, the plurality of second blades 232 are uniformly arranged between the hub 21 and the second fixing member 231 at intervals, the second blades 232 face the second air inlet 14, the axial length of the second blades 232 is smaller than the axial length of the first blades 222, and further, the ratio of the axial length of the first blades 222 to the axial length of the second blades 232 is between 1.0 and 2.5. According to the above, the width of the first segment 22 is larger than that of the second segment 23 to increase the air intake and outlet of the first segment 22, because the second air inlet 14 of the first volute casing 11 and the second air inlet 14 of the second volute casing 12 are oppositely arranged, the second segment 23 of the first impeller 2 and the second segment 23 of the second impeller 3 share one air inlet channel, so that the air volume entering from the first air inlet 13 is larger than the air volume entering from the second air inlet 14, accordingly, the axial length of the first blades 222 of the first impeller 2 is set to be greater than the axial length of the second blades 232 of the first impeller 2, so as to improve the utilization rate of the intake air volume and the output air volume of the first impeller 2, so that the axial length of the first blade 222 can match the intake air volume distributed from the first air inlet 13, and the axial length of the second blade 232 can match the intake air volume distributed from the second air inlet 14. First blade 222, wheel hub 21 and first mounting 221 enclose to close and form the first chamber that holds, and second blade 232, wheel hub 21 and second mounting 231 enclose to close and form the second and hold the chamber, and the size that the first chamber that holds is greater than the size that the second held the chamber, through carrying out segmentation treatment with first impeller 2, improves the utilization ratio to the air current of first impeller 2.
The first blade 222 and the second blade 232 may be two independent structural members, or the first blade 222 and the second blade 232 may be provided with an integral structure, and are divided by the hub 21, where one side close to the first air inlet 13 is the first blade 222, and one side close to the second air inlet 14 is the second blade 232. On the basis of ensuring the air output of the centrifugal fan, the air flow attack angles at different axial sections of the first blade 222 and the second blade 232 can be changed, and the flow field condition of the centrifugal fan is improved, so that the pneumatic performance and the noise performance of the centrifugal fan are improved. The centrifugal fan provided by the invention can meet the requirement of 400CFM (flow rate of a certain volume of air passing through a unit time per minute by a cubic foot), and the number of the first blades and the second blades is 48.
In some embodiments of the invention, the inlet and outlet stagger angles of the blades determine the shape and relative position of the blades on the hub 21, and also affect the flow smoothness of the airflow. Therefore, the inlet mounting angle and the outlet mounting angle are set in a reasonable range and are reasonably matched, so that the flow of the airflow is facilitated, the airflow speed distribution at the air outlets 15 of the first volute 11 and the second volute 12 is more uniform, the airflow is more stable, and the vortex noise formed by the airflow flow of the centrifugal fan can be effectively reduced. In one embodiment, the first vane 222 has an inlet setting angle of 80 °, an outlet setting angle of 15 °, the second vane 232 has an inlet setting angle of 75 °, and an outlet setting angle of 5 °.
In some embodiments of the present invention, the hub 21 in the prior art is a flat plate, and the airflow entering the centrifugal impeller directly impacts the hub 21 and then flows out along the hub 21 with a 90 ° deflection, and the hub 21 is easily damaged by the vertical impact of the airflow, and the airflow direction is suddenly changed, which easily causes the unstable flow direction of the airflow, resulting in the loss of kinetic energy. Therefore, in order to reduce the impact and the loss of kinetic energy of the air flow on the hub 21, the centrifugal fan further comprises a first baffle, by which the flow direction of the air flow is guided. Because the two-way air inlet of the first impeller 2 and the one-way air outlet, the first guide plates can be arranged in the first section body 22 and the second section body 23, or only the first guide plates are arranged in the first section body 22 or the second section body 23, but the position of the first guide plates is close to the position of the hub 21 as far as possible, so that the first section body 22 and/or the second section body 23 are maximized, and the air outlet efficiency is ensured. As previously described, the size of the first accommodating chamber is larger than that of the second accommodating chamber, and it is determined that the air outlet amount flowing out of the first accommodating chamber is larger, and in order to reduce the cost, only the first guide plate is provided in the first accommodating chamber, and in order to facilitate the arrangement of the first guide plate, the first guide plate is connected to the side of the hub 21 facing the first blade 222. The surface of first guide plate is the arcwall face towards first air intake 13 and air outlet 15, and after the air current got into first impeller 2, the air current contacted with first guide plate, the direct impact of the contact of having avoided air current and wheel hub 21 to wheel hub 21, the rethread arc led the air current in the face of, avoids taking place the abrupt change of flow direction, and the air current passes through along the water conservancy diversion face gradually, has reduced the kinetic energy loss, makes the air current accelerate the outflow, has improved centrifugal fan's efficiency. Similarly, a second flow guiding plate is disposed on a side of the hub 21 of the second impeller 3 facing the first blade 222, and the structure and function of the second flow guiding plate are similar to those described above, and are not described again here. The attachment of the second baffle to the hub 21 also serves to increase the strength and rigidity of the hub 21.
Wherein, first guide plate can be connected on wheel hub 21 with the mode of dismantling the connection, can be for screw connection, grafting or threaded connection, is convenient for assemble or change. The first guide plate can also be connected to the hub 21 in a non-detachable mode, and can be of an integrated structure or bonded, so that the influence of internal shaking on the dynamic balance of the first impeller 2 is reduced. The second guide plate can be detachably connected to the hub 21 and can be in screw connection, plug connection or threaded connection, so that assembly or replacement is facilitated. The second guide plate can also be connected to the hub 21 in a non-detachable manner, and can be integrated or bonded, so that the influence of the internal shaking on the dynamic balance of the second impeller 3 is reduced.
In some embodiments of the present invention, a first shaft hole is disposed in the middle of the hub 21 of the first impeller 2, the first shaft hole is used for being matched with the first driving shaft 42, and when the first driving shaft 42 drives the first impeller 2 to rotate, the position on the hub 21 closer to the first shaft hole is more stressed and is more easily damaged, in addition to the improvement of the strength and rigidity of the hub 21 by the first baffle plate, a first reinforcing rib may be further disposed on the hub 21, and the size of the first reinforcing rib is gradually reduced from the first shaft hole to the edge of the hub 21, and may refer to the size of the first reinforcing rib along the axial direction or the size along the radial direction. The first ribs may be provided only on the side of the hub 21 facing the first blade 222, may be provided only on the side of the hub 21 facing the second blade 232, or may be provided on both sides of the hub 21. Similarly, a second shaft hole is formed in the middle of the hub 21 of the second impeller 3, the second shaft hole is used for being matched with the second driving shaft 43, a second reinforcing rib can be further formed on the hub 21, and the size of the second reinforcing rib is gradually reduced from the second shaft hole to the edge of the hub 21, and the size can be the size of the second reinforcing rib along the axial direction or the size along the radial direction. The second ribs may be provided only on the side of the hub 21 facing the first blade 222, may be provided only on the side of the hub 21 facing the second blade 232, or may be provided on both sides of the hub 21.
In some embodiments of the present invention, in order to reduce the influence of the vibration generated inside the first impeller 2 and the second impeller 3 on the dynamic balance, the air output and the air output efficiency during the driving of the first impeller 2 and the second impeller 3 by the driving member 41, the first driving shaft 42 and the first impeller 2 and the second impeller 3 may be configured to be connected in a non-detachable manner, and implemented by gluing or an integral structure, or at least one rotation stopping surface may be provided on the first driving shaft 42 or the second driving shaft 43, the rotation stopping surface is a plane, the first shaft hole of the first impeller 2 is matched with the first driving shaft 42 and the second shaft hole of the second impeller 3 in a manner of matching the profile, and the transmission of the driving torque is performed through the rotation stopping surface, so as to reduce the shake and the vibration of the first impeller 2 relative to the first driving shaft 42 and the second impeller 3 relative to the driving shaft.
In some embodiments of the invention, the shape of the blades may be designed in addition to the segmentation, inlet and outlet mounting angles of the first and second impellers 2, 3. As described above, since the axial dimension of the first segment 22 is larger than the axial dimension of the second segment 23, the first segment 22 is fully utilized, and the air volume of the centrifugal fan can be increased. Specifically, each of the first blade 222 and the second blade 232 includes an inlet section 2221, an intermediate section 2222, and a rear section 2223, the inlet section 2221 faces the first air inlet 13, the intermediate section 2222 is connected to the inlet section 2221 and located downstream of the inlet section 2221, both ends of the rear section 2223 are respectively connected to the intermediate section 2222 and the hub 21, and in the first section body 22, the air flow passes through the inlet section 2221, the intermediate section 2222, and the rear section 2223 in sequence along the flow direction of the air flow. The air flow gradually deflects along with the axial direction, the deflection angles at different positions are different, because the axial dimension of the first blade 222 is larger than the axial dimension of the second blade 232, the deflection angle and the flow speed difference on the first blade 222 are more obvious, the air flow angle is deflected to the axial direction at the inlet section 2221, the air flow angle is changed to the radial direction when the air flow reaches the middle section 2222 and the rear section 2223, and the flow separation is caused near the inlet section 2221, so that the middle section 2222 and the rear section 2223 of the first blade 222 can be determined as main working sections, the ratio of the inner diameter and the outer diameter at the inlet section 2221 is larger than the ratio of the inner diameter and the outer diameter of the middle section 2222, and the ratio of the inner diameter and the outer diameter of the middle section 2222 is larger than the ratio of the inner. That is to say, the width of the inlet section 2221 is smaller than the width of the middle section 2222, the width of the middle section 2222 is smaller than the width of the rear section 2223, and the shape parameters of the first blade 222 adaptively change along with the axial direction, so that the flow separation of the inlet section 2221 is slowed down, the work capacity of the middle section 2222 and the rear section 2223 is increased, and the purpose of increasing the air volume is achieved.
In some embodiments of the invention, in one embodiment, the ratio of the inner and outer diameters at the inlet section 2221 is 0.85-0.90, the ratio of the inner and outer diameters of the intermediate section 2222 is 0.80-0.85, and the ratio of the inner and outer diameters of the rear section 2223 is 0.70-0.80. The values of the ratio of the inner and outer diameters at the inlet section 2221, the ratio of the inner and outer diameters of the intermediate section 2222, and the ratio of the inner and outer diameters of the rear section 2223 include end points.
In some embodiments of the present invention, the inlet section 2221 has an inlet setting angle of 60 ° to 80 °, an outlet setting angle of 0 ° to 25 °, the inlet setting angles of the intermediate section 2222 and the rear section 2223 are the same, 70 ° to 90 °, and the outlet setting angles are the same, 0 ° to 30 °.
In some embodiments of the present invention, according to the foregoing, the axial length of the first blade 222 is greater than the axial length of the second blade 232, and the connection between the first blade 222 and the first fixing member 221 and the hub 21 is not reliable due to the long axial length during the rotation of the first impeller 2, so that the third fixing member 24 is further disposed between the hub 21 and the first fixing member 221, and each first blade 222 is connected to the third fixing member 24. The third fixing member 24 may be disposed inside the first accommodating cavity or outside the first accommodating cavity, and in one embodiment, the third fixing member 24 is disposed outside the first accommodating cavity, and the third fixing member 24 is an annular plate.
The embodiment of the invention also provides a cooking appliance which comprises the centrifugal fan in any one of the embodiments.
The cooking appliance of the embodiment of the invention has the same beneficial effects as the centrifugal fan in the embodiment, and the description is omitted. In one embodiment, the cooking appliance is an OTR microwave oven. Under the prerequisite of guaranteeing OTR microwave oven cavity volume, do not change centrifugal fan's width, through carrying out the form design of segmentation design and first blade 222 to first impeller 2 and second impeller 3 to promote OTR microwave oven's amount of wind and efficiency. That is to say, under the unchangeable condition of overall dimension of OTR microwave oven, adopt the centrifugal fan of this embodiment can obtain bigger amount of wind, guarantee the cavity volume. Under the condition that the overall dimension of OTR microwave oven increases, the centrifugal fan of adopting this embodiment can obtain bigger amount of wind and bigger cavity volume simultaneously, and the maximize has developed centrifugal fan's characteristic, avoids the OTR microwave oven to adopt the condition of double fan for reaching certain amount of wind to OTR's cost has been reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A centrifugal fan, comprising:
the air conditioner comprises a shell, a first air inlet, a second air inlet and an air outlet are arranged on the shell, and the air outlet is positioned between the first air inlet and the second air inlet;
the driving assembly is connected to the shell and is close to the second air inlet;
at least two impellers, each the impeller all includes wheel hub, the first section body and the second section body, wheel hub connects on the drive assembly, the first section body with the second section body is connected respectively in wheel hub's both sides, the second section body is close to the drive assembly sets up, the axial length of the first section body with the axial length of the second section body is than between 1.0-2.5.
2. The centrifugal fan of claim 1, wherein the first segment has an axial length of 55-153mm and the second segment has an axial length of 30-60 mm.
3. The centrifugal fan of claim 2, wherein the first segment has an axial length of 83mm and the second segment has an axial length of 60 mm.
4. The centrifugal fan of claim 1, wherein the first segment includes a first fixture and a plurality of first blades disposed between the hub and the first fixture, the first blades facing the first air inlet;
the second segment body comprises a second fixing piece and a plurality of second blades, the second blades are arranged between the hub and the second fixing piece and face the second air inlet, and the ratio of the axial length of the first blades to the axial length of the second blades is 1.0-2.5.
5. The centrifugal fan of claim 4, wherein a distance between the drive assembly and the second air inlet is greater than or equal to 15 mm.
6. The centrifugal fan of claim 4, wherein the first and second blades each comprise:
the inlet section faces the first air inlet;
an intermediate section connected to and downstream of the inlet section;
the two ends of the rear section are respectively connected with the middle section and the hub, the ratio of the inner diameter to the outer diameter of the inlet section is larger than that of the middle section, and the ratio of the inner diameter to the outer diameter of the middle section is larger than that of the rear section.
7. The centrifugal fan as claimed in claim 6, wherein the ratio of the inner and outer diameters of the inlet section is 0.85-0.90, the ratio of the inner and outer diameters of the intermediate section is 0.80-0.85, and the ratio of the inner and outer diameters of the rear section is 0.70-0.80.
8. The centrifugal fan as claimed in claim 6, wherein the inlet installation angle of the inlet section is 60 ° to 80 °, the outlet installation angle is 0 ° to 25 °, the inlet installation angles of the middle section and the rear section are 70 ° to 90 °, and the outlet installation angle is 0 ° to 30 °.
9. The centrifugal fan as recited in claim 1, wherein the at least two impellers comprise a first impeller and a second impeller, the housing comprises a first volute and a second volute, the first volute and the second volute each having the first air inlet, the second air inlet, and the air outlet disposed thereon, the drive assembly being located between the first volute and the second volute, the first impeller being located within the first volute, and the second impeller being located within the second volute.
10. A cooking appliance comprising a centrifugal fan according to any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011638814.XA CN112780599A (en) | 2020-12-31 | 2020-12-31 | Centrifugal fan and cooking utensil |
| PCT/CN2021/140408 WO2022143328A1 (en) | 2020-12-31 | 2021-12-22 | Centrifugal fan, household appliance, volute, and cooking utensil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011638814.XA CN112780599A (en) | 2020-12-31 | 2020-12-31 | Centrifugal fan and cooking utensil |
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| CN112780599A true CN112780599A (en) | 2021-05-11 |
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| CN202011638814.XA Pending CN112780599A (en) | 2020-12-31 | 2020-12-31 | Centrifugal fan and cooking utensil |
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