CN215109623U - Combined fan and cooking utensil - Google Patents

Abstract

The utility model belongs to the technical field of fans, in particular to a combined fan and a cooking utensil, the combined fan comprises a shell, a driving component and at least two groups of impeller components, wherein the shell is provided with an air inlet and an air outlet, the driving component is connected on the shell, and the at least two groups of impeller components are connected on the driving component and are positioned in the shell; wherein, each impeller subassembly of group all includes two at least centrifugal impeller, and two at least centrifugal impeller establish ties along the axis direction, and drive assembly sets to and is used for driving two sets of impeller subassemblies at least and rotate. According to the utility model discloses combination fan, each group's impeller subassembly all includes two at least centrifugal impeller, and two at least centrifugal impeller establish ties along the axis direction, have solved the unable unlimited problem of expanding of single centrifugal impeller's width, have increased the intake and the air output of combination fan, have improved the efficiency of combination fan.

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 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.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem that the air intake and the air suction volume are small and the oil smoke absorption effect is poor under the condition that the diameter of the fan is not changed in the prior art at least. 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, wherein an air inlet and an air outlet are formed in the shell;

the driving assembly is connected to the shell;

at least two groups of impeller assemblies which are connected to the driving assembly and positioned in the shell;

each group of impeller assembly comprises at least two centrifugal impellers which are connected in series along the axial direction, and the driving assembly is arranged to drive at least two groups of impeller assemblies to rotate.

According to the utility model discloses combination fan realizes the drive to two sets of impeller subassembly through a drive assembly, has improved combination fan's whole air output and air-out efficiency, need not to adopt the drive assembly of more high-power or volume, also need not to change centrifugal impeller's volume, has reduced combination fan's cost. Specifically, the structure of two sets of impeller subassemblies is the same, and each impeller subassembly of organizing all includes two at least centrifugal impeller, and two at least centrifugal impeller establish ties along the axis direction, have solved the unable unlimited problem of expanding of single centrifugal impeller's width to guarantee under the unchangeable or small amplitude change's of combination fan diameter the condition, increased the intake and the air output of combination fan, improved the efficiency of combination fan. Be provided with air intake and air outlet on the casing, two at least centrifugal impeller all are located the casing, and under drive assembly's effect, two sets of impeller subassemblies begin to rotate, under the prerequisite that does not change the diameter of combination fan, only realize the promotion of the amount of wind and the efficiency of combination fan through the structure that changes impeller subassembly, have reduced the cost of combination fan.

In some embodiments of the invention, at least two of the centrifugal impellers comprise:

a first centrifugal impeller;

the second centrifugal impeller and the first centrifugal impeller are coaxially connected to the driving assembly, and the second centrifugal impeller is located at the downstream of the first centrifugal impeller along the flowing direction of the airflow.

In some embodiments of the present invention, the housing comprises:

the first volute is provided with a first air inlet, a second air inlet and a first air outlet, the first air outlet is positioned between the first air inlet and the second air inlet, and the first centrifugal impeller is positioned in the first volute;

the second volute is provided with a third air inlet, a fourth air inlet and a second air outlet, the second air outlet is located between the third air inlet and the fourth air inlet, the second centrifugal impeller is located in the second volute, a preset distance is arranged between the first volute and the second volute, and the driving assembly is connected to the second volute and is close to the fourth air inlet.

In some embodiments of the present invention, the first centrifugal impeller comprises:

a first hub connected to the drive assembly;

a plurality of first blades are arranged between the first hub and the first fixing piece, and the first blades face the first air inlet;

the second mounting, first wheel hub with be provided with a plurality of second blades between the second mounting, the second blade orientation the second air intake, just the axial dimension of first blade is greater than the axial dimension of second blade.

In some embodiments of the invention, the ratio of the axial dimension of the first blade to the outer diameter of the first centrifugal impeller is between 0.4 and 0.6.

In some embodiments of the present invention, the second centrifugal impeller comprises:

a second hub connected to the drive assembly;

a plurality of third blades are arranged between the second hub and the third fixing piece, and the third blades face the third air inlet;

and a plurality of fourth blades are arranged between the second hub and the fourth fixing piece, the fourth blades face the fourth air inlet, and the axial size of the third blades is larger than that of the fourth blades.

In some embodiments of the present invention, the centrifugal impeller further includes a fifth fixing member disposed between the first hub and the first fixing member, and each of the first blades is connected to the fifth fixing member.

In some embodiments of the invention, the width of the first centrifugal impeller is greater than the width of the second centrifugal impeller.

In some embodiments of the present invention, the driving assembly includes a driving member and two driving shafts, two of the driving shafts are respectively located at two sides of the driving member, each of the driving shafts is provided with at least one set of the impeller assembly.

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 structural diagram of a combined fan according to an embodiment of the present invention;

FIG. 2 is a schematic view of the combined blower of FIG. 1 in another direction;

FIG. 3 is a partial schematic view of the combined blower of FIG. 1;

FIG. 4 is a front view of the combined blower of FIG. 3;

FIG. 5 is a front view of the combined blower of FIG. 1;

FIG. 6 is a schematic structural view of a first centrifugal impeller of the combined blower of FIG. 1;

FIG. 7 is a front view of a first centrifugal impeller of the combination fan of FIG. 6;

FIG. 8 is a schematic structural view of a second centrifugal impeller of the combined blower of FIG. 1;

fig. 9 is a front view of a second centrifugal impeller of the combination fan shown in fig. 1.

The reference symbols in the drawings denote the following:

100. a combined fan;

1. a first volute; 11. a first air inlet; 12. a second air inlet; 13. a first air outlet;

2. a second volute; 21. a third air inlet; 22. a fourth air inlet; 23. a second air outlet;

3. a drive assembly; 31. a drive member; 32. a first drive shaft; 33. a second drive shaft;

4. a first impeller assembly; 41. a first centrifugal impeller; 42. a second centrifugal impeller;

411. a first hub; 412. a first fixing member; 413. a second fixing member; 414. a first blade; 415. a second blade; 416. a fifth fixing member;

421. a second hub; 422. a third fixing member; 423. a fourth fixing member; 424. a third blade; 425. a fourth blade;

5. a second impeller assembly.

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 9, a combined fan 100 according to an embodiment of the present invention includes:

the air conditioner comprises a shell, wherein an air inlet and an air outlet are formed in the shell;

the driving assembly 3, the driving assembly 3 is connected to body;

at least two groups of impeller components which are connected to the driving component 3 and are positioned in the shell;

wherein, each impeller subassembly of group all includes two at least centrifugal impeller, and two at least centrifugal impeller establish ties along the axis direction, and drive assembly 3 sets to be used for driving two at least sets of impeller subassemblies and rotate.

According to the utility model discloses combination fan 100, combination fan 100 is suitable for any equipment that needs take a breath, for example cooking utensils such as microwave oven, range hood, also can be applicable to fan equipment such as air conditioner, scavenger fan. The driving of at least two groups of impeller assemblies is realized through one driving assembly 3, the integral air output and air output efficiency of the combined fan 100 are improved, the driving assembly 3 with higher power or volume is not needed, the volume of a centrifugal impeller is not needed to be changed, and the cost of the combined fan 100 is reduced. Specifically, the structure of at least two sets of impeller subassemblies is the same, and each impeller subassembly of group all includes two at least centrifugal impeller, and two at least centrifugal impeller establish ties along the axis direction, have solved the unable unlimited problem of expanding of single centrifugal impeller's width to guarantee under the unchangeable or small amplitude change's of combination fan 100 diameter the condition, increased combination fan 100's intake and air output, improved combination fan 100's efficiency. Be provided with air intake and air outlet on the casing, two at least centrifugal impeller all are located the casing, and under drive assembly 3's effect, at least two sets of impeller subassembly begin to rotate, under the prerequisite that does not change combination fan 100's diameter, only realize the promotion of the amount of wind and the efficiency of combination fan 100 through the structure that changes impeller subassembly, have reduced combination fan 100's cost.

It should be noted that, the rotation of at least two sets of impeller assemblies realized by the driving assembly 3 may be set to be the same or different. Each set of impeller assembly includes at least two centrifugal impellers, when the number of the centrifugal impellers is two, one of the two centrifugal impellers is located at the upstream and one is located at the downstream along the flow direction of the air flow, when the number of the centrifugal impellers is three, one of the three centrifugal impellers is located at the upstream, one is located at the midstream and one is located at the downstream along the flow direction of the air flow, when the number of the centrifugal impellers is more than three, the arrangement mode can refer to the arrangement mode that the number of the centrifugal impellers is two or three, and details are not repeated herein.

In some embodiments of the present invention, at least two sets of impeller assemblies have the same structure, and the combination fan including two sets of impeller assemblies is described as an example below. At least two sets of impeller subassemblies include first impeller subassembly 4 and second impeller subassembly 5, the structure of first impeller subassembly 4 is the same with the structure of second impeller subassembly 5, all includes two at least centrifugal impeller, explains with first impeller subassembly 4 and second impeller subassembly 5 all including two centrifugal impeller below for the example, can refer to first impeller subassembly 4 and second impeller subassembly 5 and include the mode that sets up of two centrifugal impeller when first impeller subassembly 4 and second impeller subassembly 5 includes three or more centrifugal impeller, no longer gives unnecessary details. The at least two centrifugal impellers comprise a first centrifugal impeller 41 and a second centrifugal impeller 42, i.e. the first impeller assembly 4 comprises a first centrifugal impeller 41 and a second centrifugal impeller 42, the second centrifugal impeller 42 and the first centrifugal impeller 41 being coaxially connected to the drive assembly 3, i.e. the first centrifugal impeller 41 and the second centrifugal impeller 42 being connected in series, the second centrifugal impeller 42 being located downstream of the first centrifugal impeller 41 in the flow direction of the gas flow. The second impeller assembly 5 comprises a first centrifugal impeller 41 and a second centrifugal impeller 42, the second centrifugal impeller 42 and the first centrifugal impeller 41 are coaxially connected to the driving assembly 3, that is, the first centrifugal impeller 41 and the second centrifugal impeller 42 are connected in series, and the second centrifugal impeller 42 is located at the downstream of the first centrifugal impeller 41 along the flow direction of the air flow, and it can be seen that the first impeller assembly 4 and the second impeller assembly 5 are symmetrical structures. Through the series connection of the first centrifugal impeller 41 and the second centrifugal impeller 42, the air quantity of the combined fan 100 is increased, and the efficiency of the combined fan 100 is improved.

In some embodiments of the present invention, at least two centrifugal impellers are located in the casing, in order to facilitate the arrangement and installation of the first centrifugal impeller 41 and the second centrifugal impeller 42, the casing includes the first volute 1 and the second volute 2, the first volute 1 is provided with the first air inlet 11, the second air inlet 12 and the first air outlet 13, the first air outlet 13 is located between the first air inlet 11 and the second air inlet 12, and the first centrifugal impeller 41 is located in the first volute 1. According to the foregoing, the combined fan 100 includes two first centrifugal impellers 41 at different positions of the driving assembly 3, and therefore, the number of the first volutes 1 is also two, and the first volutes 1 correspond to the first centrifugal impellers 41 one by one. For the first centrifugal impeller 41, the first volute 1 is provided with two air inlets and one air outlet, which are the first air inlet 11, the second air inlet 12 and the first air outlet 13, respectively, under the action of the driving component 3, the first centrifugal impeller 41 of the first impeller component 4 and the first centrifugal impeller 41 of the second impeller component 5 both realize bidirectional air inlet through the first air inlet 11 and the second air inlet 12, and realize unidirectional air outlet through the first air outlet 13, thereby further increasing the air inlet volume and the air outlet volume of the combined fan 100. The second scroll casing 2 is provided with a third air inlet 21, a fourth air inlet 22 and a second air outlet 23, the second air outlet 23 is located between the third air inlet 21 and the fourth air inlet 22, the second centrifugal impeller 42 is located in the second scroll casing 2, the combined fan 100 includes two second centrifugal impellers 42 in total and is located at different positions of the driving assembly 3, therefore, the number of the second scroll casings 2 is also two, and the second scroll casings 2 correspond to the second centrifugal impellers 42 one by one. For the second centrifugal impeller 42, the second volute 2 is provided with two air inlets and one air outlet, which are respectively the third air inlet 21, the fourth air inlet 22 and the second air outlet 23, under the action of the driving component 3, the second centrifugal impeller 42 of the first impeller component 4 and the second centrifugal impeller 42 of the second impeller component 5 both realize bidirectional air inlet through the third air inlet 21 and the fourth air inlet 22, and realize unidirectional air outlet through the second air outlet 23, so that the air inlet amount and the air outlet amount of the combined fan 100 are further increased.

In some embodiments of the present invention, the air volume can be increased by connecting at least two centrifugal impellers in series, and the communication between the centrifugal impellers and the outside can be increased, so that more air flows are formed under the rotation of the centrifugal impellers. Therefore, the first volute 1 is provided with the first air inlet 11 and the second air inlet 12, the second volute 2 is provided with the third air inlet 21 and the fourth air inlet 22, the first centrifugal impeller 41 and the second centrifugal impeller 42 are axially connected in series, that is, the first volute 1 and the second volute 2 are axially connected in series, in order to increase the communication between the centrifugal impellers and the outside, a preset distance is provided between the first volute 1 and the second volute 2, that is, a preset distance is provided between the first centrifugal impeller 41 and the second centrifugal impeller 42, one side of the first centrifugal impeller 41 facing the second air inlet 12 and one side of the second centrifugal impeller 42 facing the third air inlet 21 share one air inlet channel, the first centrifugal impeller 41 and the second centrifugal impeller 42 are ensured to have enough air inlet amount by the preset distance, and the driving assembly 3 is connected to the two second volutes 2, the driving assembly 3 is located between the fourth air inlets 22 of the two volutes.

In some embodiments of the present invention, since the driving assembly 3 is located between the fourth air inlets 22 of the two volutes, so that the size of the fourth air inlet 22 is smaller than that of the first air inlet 11, the second air inlet 12 and the third air inlet 21, in addition, one side of the first centrifugal impeller 41 facing the second air inlet 12 and one side of the second centrifugal impeller 42 facing the third air inlet 21 share one air inlet channel, the air volume that can be distributed by the second air inlet 12 and the third air inlet 21 is smaller than that entering from the first air inlet 11, on the premise that other influencing factors such as the diameter of the centrifugal impeller do not change, the air inlet volume of the first centrifugal impeller 41 is finally formed to be larger than that of the second centrifugal impeller 42, therefore, in order to improve the utilization rate of the air flow, the width of the first centrifugal impeller 41 is set to be larger than that of the second centrifugal impeller 42, the air inlet amount and the air outlet amount of the first centrifugal impeller 41 are increased, and further the air inlet amount and the air outlet amount of the combined fan 100 are increased.

In some embodiments of the present invention, the first centrifugal impeller 41 of the first impeller assembly 4 and the first centrifugal impeller 41 of the second impeller assembly 5 have the same structure, the first centrifugal impeller 41 includes a first hub 411, a first fixing member 412 and a second fixing member 413, the first hub 411 is connected to the driving assembly 3 as a connecting member between the first centrifugal impeller 41 and the driving assembly 3, and the driving assembly 3 drives the first hub 411 to move to realize the rotation of the first centrifugal impeller 41. A plurality of first blades 414 are arranged between the first hub 411 and the first fixing part 412, the first blades 414 face the first air inlet 11, the first blades 414 are uniformly arranged between the first fixing part 412 and the first hub 411 at intervals, a plurality of second blades 415 are arranged between the first hub 411 and the second fixing part 413, the second blades 415 are uniformly arranged between the second fixing part 413 and the first hub 411 at intervals, the second blades 415 face the second air inlet 12, and the axial dimension of the first blades 414 is greater than that of the second blades 415. As described above, the width of the first centrifugal impeller 41 is greater than the width of the second centrifugal impeller 42 to increase the intake and exhaust air volumes of the first centrifugal impeller 41, because the second air inlet 12 of the first volute 1 and the third air inlet 21 of the second volute 2 are oppositely arranged, and the first centrifugal impeller 41 and the second centrifugal impeller 42 share one air inlet channel, the air volume entering from the first air inlet 11 is larger than the air volume entering from the second air inlet 12, accordingly, the axial dimension of the first blades 414 of the first centrifugal impeller 41 is set larger than the axial dimension of the second blades 415 of the first centrifugal impeller 41, so as to improve the utilization rate of the intake air volume and the output air volume of the first centrifugal impeller 41, so that the axial dimension of the first blade 414 can match the intake air volume distributed from the first intake port 11, and the axial dimension of the second blade 415 can match the intake air volume distributed from the second intake port 12. First blade 414, first wheel hub 411 and first mounting 412 enclose to close and form first chamber of holding, and second blade 415, first wheel hub 411 and second mounting 413 enclose and close and form the second chamber of holding, and the size in first chamber of holding is greater than the size in second chamber of holding, through carrying out segmentation with first centrifugal impeller 41 and handling, improves the utilization ratio to the air current of first centrifugal impeller 41.

The first blade 414 and the second blade 415 may be two independent structural members, or the first blade 414 and the second blade 415 may be provided with an integral structure, and are divided by the first hub 411, where one side close to the first air inlet 11 is the first blade 414, and one side close to the second air inlet 12 is the second blade 415. On the basis of ensuring the air output of the combined fan 100, the air flow attack angles at different axial sections of the first blade 414 and the second blade 415 can be changed, and the flow field condition of the combined fan 100 is improved, so that the aerodynamic performance and the noise performance of the combined fan 100 are improved.

In some embodiments of the present invention, the outer diameter and the width of the conventional centrifugal impeller have a certain relationship, and the ratio of the outer diameter to the width is between 0.4 and 0.6, so as to improve the efficiency of the combined fan 100 as much as possible. Therefore, the axial dimension of the first blade 414 is set to be in the range of 0.4 to 0.6 relative to the outer diameter of the first centrifugal impeller 41.

In some embodiments of the present invention, the first centrifugal impeller 41 and the second centrifugal impeller 42 are similar in structure. The second centrifugal impeller 42 includes a second hub 421, a third fixing member 422 and a fourth fixing member 423, the second hub 421 serves as a connecting member between the second centrifugal impeller 42 and the driving assembly 3, and the driving assembly 3 drives the second hub 421 to move so as to rotate the second centrifugal impeller 42. A plurality of third blades 424 are arranged between the second hub 421 and the third fixing member 422, the plurality of third blades 424 are uniformly arranged between the third fixing member 422 and the second hub 421 at intervals, the third blades 424 face the third air inlet 21, a plurality of fourth blades 425 are arranged between the second hub 421 and the fourth fixing member 423, the plurality of fourth blades 425 are uniformly arranged between the fourth fixing member 423 and the second hub 421 at intervals, and the fourth blades 425 face the fourth air inlet 22. The size of the fourth intake vent 22 is smaller than that of the first intake vent 11, the second intake vent 12 and the third intake vent 21, in addition, one side of the first centrifugal impeller 41 facing the second air inlet 12 and one side of the second centrifugal impeller 42 facing the third air inlet 21 share one air inlet channel, the air volume distributed by the second air inlet 12 and the third air inlet 21 is less than the air volume entering from the first air inlet 11, but the air volume distributed by the second air inlet 12 and the third air inlet 21 is larger than the air volume of the fourth air inlet 22, accordingly, the axial dimension of the third vane 424 is set to be larger than the axial dimension of the fourth vane 425, so as to improve the utilization rate of the intake air volume and the output air volume of the second centrifugal impeller 42, and the axial dimension of the third blade 424 can match the intake air volume distributed from the third air inlet 21, and the axial dimension of the fourth blade 425 can match the intake air volume distributed from the fourth air inlet 22. Third blade 424, second wheel hub 421 and third mounting 422 enclose to close and form the third and hold the chamber, and fourth blade 425, second wheel hub 421 and fourth mounting 423 enclose to close and form the fourth and hold the chamber, and the size that the third held the chamber is greater than the size that the fourth held the chamber, through carrying out segmentation processing with second centrifugal impeller 42, improves the utilization ratio to the air current to second centrifugal impeller 42. Finally, the axial dimension of the first blade 414 is larger than that of the second blade 415, the axial dimension of the second blade 415 is larger than that of the fourth blade 425, the axial dimension of the first blade 414 is larger than that of the third blade 424, the axial dimension of the third blade 424 is larger than that of the fourth blade 425, and the axial dimensions of the second blade 415 and the third blade 424 can be equal or different.

The third blade 424 and the fourth blade 425 may be two independent structural members, or the third blade 424 and the fourth blade 425 may be provided with an integral structure, and are divided by the second hub 421, where one side close to the third air inlet 21 is the third blade 424, and one side close to the fourth air inlet 22 is the fourth blade 425. On the basis of ensuring the air output of the combined fan 100, the air flow attack angles at different axial sections of the third blade 424 and the fourth blade 425 can be changed, and the flow field condition of the combined fan 100 is improved, so that the aerodynamic performance and the noise performance of the combined fan 100 are improved.

In some embodiments of the present invention, according to the above, in order to reduce the influence of the first volute 1 and the second volute 2 on the airflow entering from the second air inlet 12 and the third air inlet 21, the first volute 1 and the second volute 2 are prevented from blocking the airflow, and a preset distance is provided between the first volute 1 and the second volute 2.

The utility model discloses an in some embodiments, the size of predetermineeing the interval becomes positive correlation with the whole volume of combination fan 100, and it is big more to predetermine the interval, and the volume of combination fan 100 is big more, and first spiral case 1 and second spiral case 2 are less to the influence of air current. Therefore, in the case of balancing the volume of the combined fan 100 and the intake air volume of the first centrifugal impeller 41 and the second centrifugal impeller 42, the ratio of the preset distance to the outer diameter of the first centrifugal impeller 41 or the second centrifugal impeller 42 is set to be greater than or equal to 0.2, that is, the preset distance is greater than or equal to one fifth of the outer diameter of the first centrifugal impeller 41 or the second centrifugal impeller 42, and the size of the preset distance can be adjusted as required.

In some embodiments of the present invention, according to the above description, the axial dimension of the first blade 414 is greater than the axial dimension of the second blade 415, and in the process of rotating the first centrifugal impeller 41, the connection between the first blade 414 and the first fixing member 412 and the first hub 411 is unreliable due to the long accommodation of the axial dimension, and therefore, the fifth fixing member 416 is further disposed between the first hub 411 and the first fixing member 412, and each first blade 414 is connected to the fifth fixing member 416. The first blade 414, the first hub 411 and the first fixing part 412 enclose to form a first accommodating cavity, the second blade 415, the first hub 411 and the second fixing part 413 enclose to form a first accommodating cavity, and the size of the first accommodating cavity is larger than that of the second accommodating cavity. The fifth fixing member 416 may be disposed inside the first receiving cavity or outside the first receiving cavity, and in one embodiment, the fifth fixing member 416 is disposed outside the first receiving cavity, and the fifth fixing member 416 is an annular plate.

The utility model discloses an in some embodiments, wheel hub among the prior art is flat, and the air current that gets into centrifugal impeller can directly strike wheel hub on, takes place 90 along wheel hub again and deflects and flow out, and the perpendicular impact of air current leads to wheel hub's damage easily, and the air current direction takes place the sudden change, leads to the flow direction of air current unstable easily, causes the kinetic energy loss. Therefore, to reduce the impact and kinetic energy loss of the airflow on the hub, the combined fan 100 further includes a first baffle, through which the flow direction of the airflow is guided. Because the two-way air inlet of first centrifugal impeller 41, one-way air-out, consequently, can hold the intracavity at first and hold the intracavity with the second and all be provided with first guide plate, also can only hold the intracavity at first or the second and be provided with first guide plate, nevertheless will make the position of first guide plate be close to first wheel hub 411's position as far as possible to make first chamber and/or the second of holding hold the chamber maximize, guarantee air-out efficiency. As described above, the size of the first receiving cavity is larger than that of the second receiving cavity, it is determined that the air outlet amount flowing out of the first receiving cavity is larger, and in order to reduce the cost, the first guide plate is only arranged in the first receiving cavity, and in order to facilitate the arrangement of the first guide plate, the first guide plate is connected to the side of the first hub 411 facing the first blade 414. The surface of first guide plate is the arcwall face towards first air intake 11 and air outlet, after the air current got into first centrifugal impeller 41, the air current contacted with first guide plate, the direct impact of the contact of having avoided air current and first wheel hub 411 to first wheel hub 411, the rethread arc leads to the air current, avoid taking place the abrupt change of flow direction, the air current passes through gradually along the water conservancy diversion face, the kinetic energy loss has been reduced, make the air current accelerate the outflow, the efficiency of combination fan 100 has been improved. Similarly, a second flow guiding plate is disposed on a side of the second hub 421 of the second centrifugal impeller 42 facing the third blade 424, 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 second hub 421 can also serve to increase the strength and rigidity of the second hub 421.

Wherein, first guide plate can be connected on first wheel hub 411 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 first hub 411 in a non-detachable manner, and can be integrated or bonded, so that the influence of internal shaking on the dynamic balance of the first centrifugal impeller 41 is reduced. The second baffle can be detachably connected to the second hub 421, and can be screwed, inserted or screwed, so as to facilitate assembly or replacement. The second baffle can also be connected to the second hub 421 in a non-detachable manner, and can be integrated or bonded to reduce the influence of the internal shaking on the dynamic balance of the second centrifugal impeller 42.

In some embodiments of the present invention, the driving component 3 drives the first impeller component 4 and the second impeller component 5 to move synchronously, the first impeller component 4 and the second impeller component 5 may share the same driving component 31, and the first impeller component 4 and the second impeller component 5 may also be driven by two driving components 31 separately, in one embodiment, the first impeller component 4 and the second impeller component 5 share one driving component 31. The driving assembly 3 comprises a driving member 31, a first driving shaft 32 and a second driving shaft 33, the first driving shaft 32 and the second driving shaft 33 are respectively positioned at two sides of the driving member 31, and the two groups of impeller assemblies are respectively connected to the first driving shaft 32 and the second driving shaft 33. Further, the first and second driving shafts 32 and 33 are symmetrically disposed at both sides of the driving member 31, that is, the first and second impeller assemblies 4 and 5 are symmetrically disposed at both sides of the driving member 31. In one embodiment, the drive member 31 is an electric motor. The first centrifugal impeller 41 and the second centrifugal impeller 42 of the first impeller assembly 4 are connected to the first drive shaft 32, and the first centrifugal impeller 41 and the second centrifugal impeller 42 of the second impeller assembly 5 are connected to the second drive shaft 33.

In some embodiments of the present invention, the first hub 411 of the first centrifugal impeller 41 is provided in the middle with a first shaft hole, the first shaft hole is used for cooperating with the first driving shaft 32 or the second driving shaft 33, in the process that the first driving shaft 32 or the second driving shaft 33 drives the first centrifugal impeller 41 to rotate, the position stress on the first hub 411 that is closer to the first shaft hole is larger, and the damage is more likely to occur, besides the promotion of the strength and the rigidity of the first hub 411 by the first guide plate, the first hub 411 may be further provided with a first reinforcing rib, the size of the first reinforcing rib is gradually reduced from the first shaft hole to the edge of the first hub 411, and the size may refer to the size of the first reinforcing rib along the axis direction, and may also refer to the size along the radial direction. The first ribs may be provided only on the side of the first hub 411 facing the first blade 414, may be provided only on the side of the first hub 411 facing the second blade 415, and may be provided on both sides of the first hub 411. Similarly, a second shaft hole is formed in the middle of the second hub 421 of the second centrifugal impeller 42, the second shaft hole is used for being matched with the first driving shaft 32 or the second driving shaft 33, a second reinforcing rib is further disposed on the second hub 421, and the size of the second reinforcing rib is gradually reduced from the second shaft hole to the edge of the second hub 421, and the size may refer to the size of the second reinforcing rib along the axial direction or the radial direction. The second rib may be provided only on the side of the second hub 421 facing the third blade 424, may be provided only on the side of the second hub 421 facing the fourth blade 425, or may be provided on both sides of the second hub 421.

In some embodiments of the present invention, the first centrifugal impeller 41 and the second centrifugal impeller 42 are coaxially arranged on the first drive shaft 32 or the second drive shaft 33, according to the above. In order to reduce the influence of the vibration generated inside the first impeller assembly 4 and the second impeller assembly 5 on the dynamic balance, the air output and the air output efficiency during the driving of the first impeller assembly 4 and the second impeller assembly 5 by the driving member 31, the first driving shaft 32 and the first centrifugal impeller 41 and the second centrifugal impeller 42 may be non-detachably connected, the method is realized by gluing or an integral structure, at least one rotation stopping surface can be arranged on the first driving shaft 32 or the second driving shaft 33, the rotation stopping surface is a plane, the first shaft hole of the first centrifugal impeller 41 and the second shaft hole of the second centrifugal impeller 42 are matched with the first driving shaft 32 or the second driving shaft 33 in a contour matching way, the transmission of the driving torque is performed through the rotation stop surface, and the rattling and vibration of the first centrifugal impeller 41 and the second centrifugal impeller 42 with respect to the first drive shaft 32 or the second drive shaft 33 are reduced.

The embodiment of the utility model provides a cooking utensil is still proposed, combination fan 100 in any embodiment above-mentioned.

The utility model discloses cooking utensil is the same with the beneficial effect that combination fan 100 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 cooking appliance, the width of the combined fan 100 is not changed, and the air quantity and the efficiency of the cooking appliance are improved through the series connection of at least two centrifugal impellers. That is to say, under the unchangeable condition of cooking utensil's overall dimension, adopt the combination fan 100 of this embodiment can obtain bigger amount of wind, guarantee the cavity volume. Under the condition that the overall dimension of the cooking appliance is increased, the combined fan 100 of the embodiment can obtain larger air volume and larger cavity volume at the same time. The characteristic of combination grade is developed to the maximum, the condition that double fans are needed to be adopted by cooking appliances for achieving certain air quantity is avoided, and therefore the cost of the OTR microwave oven is 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 (10)

1. A combination fan, characterized in that includes:

the air conditioner comprises a shell, wherein an air inlet and an air outlet are formed in the shell;

the driving assembly is connected to the shell;

at least two groups of impeller assemblies which are connected to the driving assembly and positioned in the shell;

each group of impeller assembly comprises at least two centrifugal impellers which are connected in series along the axial direction, and the driving assembly is arranged to drive at least two groups of impeller assemblies to rotate.

2. The combined fan of claim 1, wherein at least two of the centrifugal impellers comprise:

a first centrifugal impeller;

the second centrifugal impeller and the first centrifugal impeller are coaxially connected to the driving assembly, and the second centrifugal impeller is located at the downstream of the first centrifugal impeller along the flowing direction of the airflow.

3. The combination fan of claim 2, wherein the housing comprises:

the first volute is provided with a first air inlet, a second air inlet and a first air outlet, the first air outlet is positioned between the first air inlet and the second air inlet, and the first centrifugal impeller is positioned in the first volute;

the second volute is provided with a third air inlet, a fourth air inlet and a second air outlet, the second air outlet is located between the third air inlet and the fourth air inlet, the second centrifugal impeller is located in the second volute, a preset distance is arranged between the first volute and the second volute, and the driving assembly is connected to the second volute and is close to the fourth air inlet.

4. The combined fan of claim 3, wherein the first centrifugal impeller comprises:

a first hub connected to the drive assembly;

a plurality of first blades are arranged between the first hub and the first fixing piece, and the first blades face the first air inlet;

the second mounting, first wheel hub with be provided with a plurality of second blades between the second mounting, the second blade orientation the second air intake, just the axial dimension of first blade is greater than the axial dimension of second blade.

5. The combination fan of claim 4 wherein the ratio of the axial dimension of the first blade to the outer diameter of the first centrifugal impeller is between 0.4 and 0.6.

6. The combined fan of claim 3, wherein the second centrifugal impeller comprises:

a second hub connected to the drive assembly;

a plurality of third blades are arranged between the second hub and the third fixing piece, and the third blades face the third air inlet;

and a plurality of fourth blades are arranged between the second hub and the fourth fixing piece, the fourth blades face the fourth air inlet, and the axial size of the third blades is larger than that of the fourth blades.

7. The combination fan of claim 4, wherein the centrifugal impeller further comprises a fifth fixture disposed between the first hub and the first fixture, each of the first blades being connected to the fifth fixture.

8. The combination fan of claim 2, wherein the first centrifugal impeller has a width greater than a width of the second centrifugal impeller.

9. The combination fan of claim 1, wherein the drive assembly comprises a drive member and two drive shafts, the two drive shafts being respectively disposed on opposite sides of the drive member, each of the drive shafts having at least one set of the impeller assemblies disposed thereon.

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

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