CN215109624U

CN215109624U - Combined fan and cooking utensil

Info

Publication number: CN215109624U
Application number: CN202023352335.XU
Authority: CN
Inventors: 任志文; 林健; 任孟珂
Original assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-12-10
Anticipated expiration: 2030-12-31

Abstract

The utility model belongs to the technical field of the fan, concretely relates to combination fan and cooking utensil, this combination fan includes the casing, drive assembly, two at least impellers and current collector, be provided with first air intake on the casing, second air intake and air outlet, drive assembly connects on the casing and is close to the second air intake, two at least impellers all are connected with drive assembly, drive assembly sets to and is used for driving two at least impellers to rotate, current collector connects on the casing and is close to first air intake, current collector sets to make the air current have radial velocity. According to the utility model discloses combination fan changes from the impeller is in quantity, has reduced combination fan's cost, has improved combination fan's whole air output and air-out efficiency, for the air input and the air output that improve combination fan under second air intake and drive assembly's restriction, leads in advance to the air current that gets into from first air intake through the collector, makes the air current have radial velocity, reduces the separation that flows.

Description

Combined fan and cooking utensil

Technical Field

The utility model belongs to the technical field of the fan, concretely relates to combination fan and cooking utensil.

Background

This section provides background information related to the present disclosure only and is not necessarily prior art.

Compared with the traditional combined fan, the multi-wing combined fan generally adopts double-side inlets and has larger impeller width, but the multi-wing combined fan is limited by the inlet width, the performance of the motor cannot be developed to the maximum, 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. And because the airflow angle at the inlet is deviated to the axial direction, the vortex is caused, and the condition of flow separation is generated, and the airflow angle is changed into the radial direction after reaching the middle and rear sections and flows out along the radial direction, the effective acting length is small, and the air inlet amount and the air outlet amount of the fan cannot reach the optimal values.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving at least the problem that the separation of flowing exists in the little and entrance of the amount of wind of fan under the unchangeable condition of fan diameter among the prior art. The purpose is realized by the following technical scheme:

the utility model discloses a first aspect provides a combination fan, include:

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, wherein the at least two impellers are both connected with the driving assembly, and the driving assembly is arranged for driving the at least two impellers to rotate;

a collector connected to the housing proximate the first air inlet, the collector configured to impart a radial velocity to the air flow.

According to the utility model discloses combination fan, combination fan are suitable for any equipment that needs take a breath, for example microwave oven, range hood, air conditioner, scavenger fan etc.. The driving of at least two impellers is realized through one driving assembly, the integral air output and air outlet efficiency of the combined fan are improved, the driving assembly with larger power or volume is not needed, the impellers are changed in quantity, the radial size of the impellers is not needed to be changed, the cost of the combined fan is reduced on the premise of ensuring the ratio of the original radial size, namely on the premise of ensuring the optimal size of the impellers, and the integral air output and air outlet efficiency of the combined fan are improved. The shell is provided with a first air inlet, a second air inlet and an air outlet, airflow enters the impeller from the first air inlet and the second air inlet respectively and flows out of the air outlet, bidirectional air inlet is achieved through the first air inlet and the second air inlet, unidirectional air outlet is achieved through the air outlet, and the air inlet volume and the air outlet volume of the combined fan are further increased. 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 combined 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. Therefore, in order to improve the air inlet quantity and the air outlet quantity of the combined fan under the limitation of the second air inlet and the driving assembly, the combined fan further comprises a collector, the collector is connected to the shell, airflow entering from the first air inlet is guided in advance through the collector, the airflow has radial speed, flow separation is reduced, the speed and the flow of the airflow entering the first air inlet are improved, and the air inlet quantity of the first air inlet of the impeller is adjusted through the collector to adapt to the structure of the combined fan.

In some embodiments of the present invention, the current collector comprises:

the body is of an annular structure and is connected to the shell and close to the first air inlet;

the guide vane is connected to the inner side wall of the body, and the surface of the guide vane is a curved surface so that the airflow has radial speed.

In some embodiments of the present invention, the body is disposed to be inclined outward with respect to an axis of the impeller.

In some embodiments of the invention, the angle between the body and the axis of the impeller is between 10 ° and 50 °.

In some embodiments of the invention, the ratio of the axial dimension of the collector to the diameter of the impeller is between 0.1 and 0.3.

In some embodiments of the present invention, the guide vane has an inlet installation angle of 70 ° to 90 ° and an outlet installation angle of 0 ° to 30 °.

In some embodiments of the present invention, the inner diameter of the body is greater than or equal to the inner diameter of the first air inlet, and the outer diameter of the body is less than or equal to the outer diameter of the casing.

In some embodiments of the present invention, the guide vane and the body are of an integral structure, and the body and the housing are of an integral structure.

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 spiral case and a second spiral case, the first impeller is located in the first spiral case, the second impeller is located in the second spiral case, the first spiral case and the second spiral case are all provided with the first air inlet, the second air inlet and the air outlet, the driving component is located between the first spiral case and the second spiral case, and the first spiral case and the second spiral case are respectively provided with the current collector.

The second aspect of the utility model provides a cooking utensil, combination fan among the above-mentioned arbitrary technical scheme.

The utility model discloses cooking utensil is the same with the beneficial effect that the combination fan in the above-mentioned embodiment had, no longer gives unnecessary details here.

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 perspective view of a combined fan according to an embodiment of the present invention;

FIG. 2 is a front view of the combined blower of FIG. 1;

FIG. 3 is a schematic view of the current collector shown in FIG. 1;

FIG. 4 is a cross-sectional view of the combination blower of FIG. 1;

fig. 5 is an enlarged schematic view of a portion a shown in fig. 4.

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 fixing member; 23. a first blade; 24. a second fixing member; 25. a second blade;

3. a second impeller;

4. a drive assembly; 41. a drive member; 42. a first drive shaft; 43. a second drive shaft;

5. a current collector; 51. a body; 52. a guide vane.

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 5, the combined 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;

the at least two impellers are connected with the driving assembly 4, and the driving assembly 4 is used for driving the at least two impellers to rotate;

a collector 5, the collector 5 being connected to the housing 1 and being located close to the first air inlet 13, the collector 5 being arranged to impart a radial velocity to the air flow.

According to the utility model discloses combination fan, combination fan are suitable for any equipment that needs take a breath, for example microwave oven, range hood, air conditioner, scavenger fan etc.. The driving of at least two impellers is realized through one driving component 4, the integral air output and air outlet efficiency of the combined fan are improved, the driving component 4 with higher power or volume is not needed, the impellers are changed in quantity, the radial size of the impellers is not needed to be changed, the cost of the combined fan is reduced on the premise of ensuring the original radial size ratio, namely on the premise of ensuring the optimal size of the impellers, and the integral air output and air outlet efficiency of the combined fan are improved. The casing 1 is provided with a first air inlet 13, a second air inlet 14 and an air outlet 15, air flows respectively enter the impeller from the first air inlet 13 and the second air inlet 14 and then flow out from the air outlet 15, bidirectional air inlet is realized through the first air inlet 13 and the second air inlet 14, unidirectional air outlet is realized through the air outlet 15, and the air inlet volume and the air outlet volume of the combined fan are further increased. 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 a serial upstream and downstream relationship, can also be connected on one side of the driving assembly 4 in a parallel relationship, and can also be two independent impellers which are connected on two sides of the driving assembly 4 in a relationship of not influencing each other. In order to ensure that the overall size of the combined fan is not too large, the driving assembly 4 is arranged close to the second air inlet 14, so that the driving assembly 4 can affect the air inlet amount of the second air inlet 14. Therefore, in order to improve the air inlet amount and the air outlet amount of the combined fan under the limitation of the second air inlet 14 and the driving assembly 4, the combined fan further comprises a current collector 5, the current collector 5 is connected to the shell 1, the air flow entering from the first air inlet 13 is guided in advance through the current collector 5, the air flow has a radial speed after entering the shell 1, the angle of attack of the air flow when entering the impeller is reduced, flow separation is reduced, the speed and the flow rate of the air flow entering the first air inlet 13 are improved, and the air inlet amount of the first air inlet 13 of the impeller is adjusted through the current collector 5 to adapt to the structure of the combined fan.

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. The at least two impellers may be identical or different in structure. The current collector has three arrangement modes, namely, the first current collector is only arranged at the first air inlet 13; the second type is only arranged at the second air inlet 14; thirdly, the first air inlet 13 and the second air inlet 14 are respectively provided. Since the driving assembly 4 is close to the second air inlet 14, in order to reduce the workload of the structural design layout, in one embodiment, the collector 5 is only arranged at the first air inlet 13, the air flow entering from the first air inlet 13 is guided in advance through the collector 5, so that the air flow has a radial velocity after entering the housing 1, the attack angle of the air flow when entering the impeller is reduced, the flow separation is reduced, the velocity and the flow rate of the air flow entering the first air inlet 13 are improved, and the air inlet amount of the first air inlet 13 of the impeller is adjusted through the collector 5 to adapt to the structure of the combined fan. The number of the current collectors 5 at the first air inlet 13 is at least one, and two or three current collectors 5 may be connected in series along the flowing direction of the air flow. When two or three collectors 5 are connected in series, the design of the structure and parameters of the collectors 5 can be modified to further increase the radial velocity of the gas flow.

In some embodiments of the present invention, the present invention comprises at least two impellers. 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. In one embodiment, the at least two impellers include a first impeller 2 and a second impeller 3, the first impeller 2 and the second impeller 3 have the same structure, the first impeller 2 and the second impeller 3 each include a hub 21, a first segment facing the first air inlet 13, and a second segment facing the second air inlet 14, and an axial dimension of the second segment near the driving assembly 4 is smaller than an axial dimension of the second segment far from the first segment. The axial sizes of different positions of the impeller are adjusted to adapt to the structure of the combined fan. Wheel hub 21 encloses with the first section body and closes and form the first chamber that holds, and wheel hub 21 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, is different in axial size, and is combined with the current collector 5, so that the acting of the impeller can be maximized, the effective acting size is increased, the air quantity and the efficiency of the combined fan are increased, and the combined fan is beneficial to realizing the compactness and the miniaturization.

The first impeller 2 and the second impeller 3 may be both axial flow impellers or both centrifugal impellers.

In some embodiments of the utility model, in order to facilitate the arrangement and installation of first impeller 2 and second impeller 3, casing 1 includes first spiral case 11 and second spiral case 12, be provided with first air intake 13 on the first spiral case 11, second air intake 14 and air outlet 15, first impeller 2 is located first spiral case 11, to first impeller 2, be provided with two air intakes and an air outlet 15 on the first spiral case 11, be first air intake 13 respectively, second air intake 14 and air outlet 15, under drive assembly 4's effect, first impeller 2 realizes two-way air inlet through first air intake 13 and second air intake 14, realize one-way air-out through air outlet 15, the intake and the air output of combination fan have further been increased. The first volute 11 and the second volute 12 have the same structure, 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 assembly 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 combined 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 influences the intake air volume of the second intake opening 14, that is, influences the intake air volume, the outtake air volume and the efficiency of the second segment of the first impeller 2 and the second segment of the second impeller 3.

In some embodiments of the present invention, in the structure of the above-mentioned combined fan, the first air inlet 13 of the first volute 11 and the first air inlet 13 of the second volute 12 are respectively provided with the current collector 5, the air flow entering the first impeller 2 and the second impeller 3 is changed in the flowing direction by the current collector 5, and the air intake and the air output of the combined fan are jointly improved. And meanwhile, the negative pressure, the wind pressure, the total pressure and the like on the two sides of the combined fan are the same, so that the difference between the two sides of the combined fan is reduced, the connection strength of the combined fan is protected, and the service life of the combined fan is prolonged.

In some embodiments of the present invention, according to the above, the distance between the driving assembly 4 and the second air inlet 14 of the first volute 11 and between the driving assembly 4 and the second air inlet 14 of the second volute 12 affects the air intake of the second air inlet 14 to a certain extent, and the distance is positively correlated with the air intake, and negatively correlated with the volume of the combined fan. Therefore, the volume of the combined fan and the whole air inlet volume of the combined 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 realize uniform air 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 can share one drive member 41, or the first impeller 2 and the second impeller 3 can be driven by two drive members 41 separately, in one embodiment, 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, the specific structure of the first segment and the second segment will be described below. The first segment body comprises a first fixing piece 22 and a plurality of first blades 23, the plurality of first blades 23 are uniformly arranged between the hub 21 and the first fixing piece 22 at intervals, and the first blades 23 face the first air inlet 13. The second segment comprises a second fixing piece 24 and a plurality of second blades 25, the plurality of second blades 25 are uniformly arranged between the hub 21 and the second fixing piece 24 at intervals, the second blades 25 face the second air inlet 14, the axial size of the second blades 25 is smaller than that of the first blades 23, and furthermore, the ratio of the axial size of the first blades 23 to the axial size of the second blades 25 is 1.0-2.5. According to the above, the axial dimension of the first section is larger than that of the second section to increase the air inlet amount and the air outlet amount of the first section, because the second air inlet 14 of the first volute 11 and the second air inlet 14 of the second volute 12 are oppositely arranged, the second segment of the first impeller 2 and the second segment 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, therefore, the axial dimension of the first blades 23 of the first impeller 2 is set larger than the axial dimension of the second blades 25 of the first impeller 2, so as to improve the utilization rate of the air intake and the air output of the first impeller 2, so that the axial dimension of the first blade 23 can match the air intake distributed from the first air inlet 13, and the axial dimension of the second blade 25 can match the air intake distributed from the second air inlet 14. First blade 23, wheel hub 21 and first mounting 22 enclose to close and form the first chamber that holds, and second blade 25, wheel hub 21 and second mounting 24 enclose to close and form the second and hold the chamber, and the size that the first chamber that holds is greater than the second and holds the size in 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 23 and the second blade 25 may be two independent structural members, or the first blade 23 and the second blade 25 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 23, and one side close to the second air inlet 14 is the second blade 25. On the basis of ensuring the air output of the combined fan, the air flow attack angles at different axial sections of the first blade 23 and the second blade 25 can be changed, and the flow field condition of the combined fan is improved, so that the pneumatic performance and the noise performance of the combined fan are improved.

The utility model discloses an in some embodiments, wheel hub 21 among the prior art is flat, and the air current that gets into the impeller can directly strike wheel hub 21 on, takes place 90 along wheel hub 21 again and deflects and flow out, and the perpendicular impact of air current leads to wheel hub 21's damage easily, and the air current direction takes place the snap, leads to the flow direction of air current unstable easily, causes the kinetic energy loss. Therefore, in order to reduce the impact and kinetic energy loss of the air flow on the hub 21, the combined fan further comprises a flow guide plate, and the flow direction of the air flow is guided by the flow guide plate. Because the two-way air inlet of first impeller 2, one-way air-out, consequently, can all be provided with the guide plate in first section internal and second section internal, also can only be provided with the guide plate in first section body or second section body, nevertheless will make the position of guide plate as far as near as wheel hub 21's position to make first section body and/or second section body maximize, guarantee air-out efficiency. According to the foregoing, the size of the first accommodating cavity is larger than that of the second accommodating cavity, it can be determined that the air outlet volume flowing out of the first accommodating cavity is larger, and in order to reduce the cost, a guide plate is provided only in the first accommodating cavity, and in order to facilitate the arrangement of the guide plate, the guide plate is connected to the side of the hub 21 facing the first blade 23. The surface of guide plate is towards the arcwall face of first air intake 13 and air outlet 15, and after the air current got into first impeller 2, the air current contacted with the guide plate, avoided the direct impact of air current and wheel hub 21's contact to wheel hub 21, the rethread arc led the air current to the face, avoided taking place the abrupt change of flow direction, and the air current passes through gradually along the water conservancy diversion face, has reduced the kinetic energy loss, makes the air current accelerate the outflow, has improved the efficiency of combination fan.

Wherein, the 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 guide plate can also be connected on wheel hub 21 with non-detachable mode, can be structure as an organic whole or bond, reduces the inside influence of rocking to first impeller 2's dynamic balance. The guide plate can be connected on wheel hub 21 in the mode of can dismantling the connection, can be for screw connection, grafting or threaded connection, is convenient for assemble or change. The 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.

The utility model discloses an in some embodiments, the centre of first impeller 2's wheel hub 21 is provided with first shaft hole, first shaft hole is used for cooperating with first drive shaft 42, drive first impeller 2 pivoted in-process at first drive shaft 42, the position atress that is close to first shaft hole more on wheel hub 21 is big more, damage appears more easily, except relying on the guide plate to the promotion of wheel hub 21's intensity and rigidity, can also be provided with first strengthening rib on wheel hub 21, the size of first strengthening rib reduces from first shaft hole to wheel hub 21's edge gradually, this size can refer to the size of first strengthening rib along the axis direction, also can refer to along radial direction's size. The first ribs may be provided only on the side of the hub 21 facing the first blades 23, may be provided only on the side of the hub 21 facing the second blades 25, 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 blades 23, only on the side of the hub 21 facing the second blades 25, or both sides of the hub 21 may be provided with the second ribs.

In some embodiments of the present invention, in the process of driving the first impeller 2 and the second impeller 3 by the driving member 41, 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 outlet efficiency, the first driving shaft 42 and the first impeller 2 and the second impeller 3 can be connected in a non-detachable manner, and the connection is realized by gluing or an integrated structure, and at least one rotation stopping surface can be provided on the first driving shaft 42 or the second driving shaft 43, and the rotation stopping surface is a plane, and the first shaft hole of the first impeller 2 and the second shaft hole of the first driving shaft 42 and the second impeller 3 are matched with the second driving shaft 43 in a contour matching manner, so as to transmit the driving torque through the rotation stopping surface, thereby reducing the shake and 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 present invention, the general structure of the combined blower is described above, and the collector 5 is described in detail below. The current collector 5 comprises a body 51 and guide vanes 52, the body 51 is connected to the housing 1 and close to the first air inlet 13, the whole body is of an annular structure, the guide vanes 52 are connected to the inner side wall of the body 51, namely, on the side of the body 51 facing the first air inlet 13, and the surfaces of the guide vanes are curved surfaces to further reduce the flow loss of the air flow. In the operation process of the combined fan, the airflow has two flow paths, the first airflow enters from the first air inlet 13, needs to pass through the current collector 5 firstly, enters the first section of the first impeller 2 along the surface of the current collector 5, and changes the flow direction of the airflow through the current collector 5, so that the flow direction of the airflow is closer to the flow direction of the airflow from the air outlet 15, the bending loss of the airflow from the first air inlet 13 to the air outlet 15 is reduced, the component velocity of the airflow in the radial direction is increased, and the airflow is enabled to rotate in advance. According to the theoretical lift formula of the fan, the radial speed of the airflow of the first impeller 2 and the second impeller 3 is increased, so that the total pressure of the combined fan can be effectively reduced, the efficiency of the combined fan is improved, and the air quantity of the combined fan is increased.

The number of the guide vanes 52 is at least one, and may be one, two or more, in one embodiment, the guide vanes 52 are provided in plurality, the guide vanes 52 are uniformly connected to the body 51 at intervals, and in one embodiment, the guide vanes are provided in 48. The guide vanes 52 and the body 51 can be detachably connected, for example, in a threaded connection, a screw connection or an insertion connection, so that the number of the guide vanes 52 can be adjusted to meet different requirements, and damaged guide vanes 52 can be replaced in time to ensure the guiding effect of the current collector 5. The guide vane 52 and the body 51 may also be non-detachably connected, such as bonded, welded or integrated, so as to increase the connection strength between the guide vane 52 and the body 51 and avoid the separation of the guide vane 52 and the body 51 during the operation of the combined fan. The guide vane 52 and the body 51 can be partially detachably connected and partially non-detachably connected to keep the advantages of the two ways. In one embodiment, the body 51 is provided as a unitary structure with the housing 1 for ease of manufacture and to reduce assembly processes. The body 51 may be detachably connected to the housing 1, for example by screwing, screwing or plugging, so that the damaged body 51 may be easily replaced to ensure the guiding effect of the current collector 5. The body 51 and the casing 1 may also be non-detachably connected, such as bonded, welded or integrated, so as to increase the connection strength between the body 51 and the casing 1 and avoid the separation of the body 51 and the casing 1 during the operation of the combined blower. In one embodiment, the body 51 is provided as a unitary structure with the housing 1 for ease of manufacture and to reduce assembly processes.

In some embodiments of the present invention, the body 51 is disposed to be inclined outward with respect to the axis of the first impeller 2 or the second impeller 3. Make body 51 be the flaring form, the one end that the diameter is great relatively is towards external environment, and the one end that the diameter is less relatively is towards first air intake 13, plays the effect that guides and draws in to the air current through the flaring form, increases the intake that gets into first impeller 2 and second impeller 3, improves the utilization ratio to the air current. Furthermore, the angle α between the body 51 and the axis of the first impeller 2 or the second impeller 3 is between 10 ° and 50 °.

The inner surface of the body 51 may be a plane or an arc surface.

In some embodiments of the present invention, the size of the current collector 5 determines the final size of the combined fan without changing the sizes of the first impeller 2, the second impeller 3, the housing 1 and the driving assembly 4, and to a certain extent, the size of the current collector 5 is positively correlated with the size of the combined fan. After the air inlet volume, the air outlet volume and the volume of the combined fan are balanced, the axial size of the current collector 5 is limited, the ratio of the axial size of the current collector 5 to the diameter of the first impeller 2 or the second impeller 3 is 0.1-0.3, meanwhile, the radial size of the current collector 5 is limited, the inner diameter of the body 51 is larger than or equal to the inner diameter of the first air inlet 13, the outer diameter of the body 51 is smaller than or equal to the outer diameter of the shell 1, the maximum outer diameter of the final combined fan is the outer diameter of the shell 1, and the current collector 5 can only increase the airflow flow of the first air inlet 13 without blocking the airflow flow.

In some embodiments of the present invention, both surfaces of the guide vane 52 are curved surfaces, the inlet mounting angle of the guide vane 52 is between 50 ° and 90 °, the outlet mounting angle is between 0 ° and 50 °, and further, the inlet mounting angle of the guide vane 52 is between 70 ° and 90 °, and the outlet mounting angle is between 0 ° and 30 °.

The embodiment of the utility model provides a cooking utensil is still provided, combination fan in above-mentioned arbitrary embodiment.

The utility model discloses cooking utensil is the same with the beneficial effect that the combination fan in the above-mentioned embodiment had, no longer gives unnecessary details here. In one embodiment, the cooking appliance is an OTR microwave oven. On the premise of ensuring the volume of the cavity of the OTR microwave oven, the width of the combined fan is not changed, and the air quantity and the efficiency of the OTR microwave oven are improved. That is to say, under the unchangeable condition of overall dimension of OTR microwave oven, adopt the combination 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 combination fan of adopting this embodiment can obtain bigger amount of wind and bigger cavity volume simultaneously, and the maximize has developed the characteristic of combination fan, 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 should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A combination fan, characterized in that includes:

2. The combined fan of claim 1, wherein the current collector comprises:

3. The combination fan of claim 2, wherein the body is disposed obliquely outwardly relative to an axis of the impeller.

4. The combination fan of claim 3, wherein the angle between the body and the axis of the impeller is between 10 ° and 50 °.

5. The combined fan of claim 1, wherein the ratio of the axial dimension of the collector to the diameter of the impeller is between 0.1-0.3.

6. The combination fan of claim 2, wherein the guide vanes have an inlet setting angle of between 70 ° and 90 ° and an outlet setting angle of between 0 ° and 30 °.

7. The combined fan as claimed in claim 2, wherein the inner diameter of the body is equal to or greater than the inner diameter of the first air inlet, and the outer diameter of the body is equal to or less than the outer diameter of the housing.

8. The combination fan of claim 2, wherein the guide vane is integrally formed with the body, and the body is integrally formed with the housing.

9. The combination fan of 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 impeller is located in the first volute, the second impeller is located in the second volute, the first air inlet, the second air inlet, and the air outlet are disposed on each of the first volute and the second volute, the drive assembly is located between the first volute and the second volute, and the collector is disposed on each of the first volute and the second volute.

10. A cooking appliance comprising a combination fan as claimed in any one of claims 1 to 9.