CN218151510U

CN218151510U - Multi-stage fan

Info

Publication number: CN218151510U
Application number: CN202222505367.1U
Authority: CN
Inventors: 李锐; 程继余; 白江涛; 张学锋
Original assignee: Shigatuobo Clean Power Rugao Co ltd
Current assignee: Shigatuobo Clean Power Rugao Co ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2022-12-27
Anticipated expiration: 2032-09-21

Abstract

The embodiment of the utility model provides a multistage fan, multistage fan includes casing subassembly, motor stator, pivot and the impeller that is used as electric motor rotor, casing subassembly has the air intake that sets gradually and communicate along the first direction, casing inner chamber and air outlet, motor stator links to each other and is located the casing inner chamber with casing subassembly, the pivot is located the casing inner chamber along the first direction extension, and the part of pivot is worn to establish in motor stator, the impeller is established on the outer peripheral face of pivot, and the impeller is located the casing inner chamber, the impeller is at least two, two at least impellers are arranged along the axis direction interval of pivot. The utility model discloses multistage fan directly sets up motor stator in housing assembly, simultaneously with two at least impeller settings in the pivot as electric motor rotor to the complexity of multistage fan has been simplified, has made the utility model discloses multistage fan has simple structure and small advantage.

Description

Multi-stage fan

Technical Field

The utility model relates to a fan technical field, concretely relates to multistage fan.

Background

Multistage fan among the correlation technique sets up two driving motor that the interval was arranged on the flow direction of gas in the casing of fan, and every driving motor is used for driving an impeller rotation respectively to promote the efficiency of fan through two impellers, however, because multistage fan among the correlation technique needs set up two independent driving motor in the casing, consequently lead to this multistage fan to have the structure complicacy, the great problem of volume.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. To this end, embodiments of the present invention provide a multi-stage fan having advantages of simple structure and small volume due to at least two impellers being simultaneously disposed on a rotating shaft serving as a rotor of an electric motor.

The utility model discloses multistage fan includes:

the shell assembly is provided with an air inlet, a shell inner cavity and an air outlet which are sequentially arranged along a first direction and are communicated;

a motor stator connected to the housing assembly and positioned within the housing cavity;

the rotating shaft is used as a motor rotor, extends along a first direction and is positioned in the inner cavity of the shell, and part of the rotating shaft penetrates through the motor stator;

the impeller is arranged on the outer peripheral surface of the rotating shaft and located in the inner cavity of the shell, the number of the impellers is at least two, and the impellers are arranged at intervals along the axis direction of the rotating shaft.

The utility model discloses multistage fan directly sets up motor stator at housing assembly, sets up two at least impellers in the pivot that is used as electric motor rotor simultaneously to simplify the complexity of multistage fan, made the utility model discloses multistage fan has simple structure and small advantage.

In some embodiments, the at least two impellers include a first impeller and a second impeller, the first impeller is disposed at one end of the rotating shaft adjacent to the air inlet, and the second impeller is disposed at the other end of the rotating shaft adjacent to the air outlet.

In some embodiments, the multi-stage wind turbine further comprises an aft guide vane coupled to the housing assembly and positioned within the housing cavity, the aft guide vane positioned downstream of the second impeller; and/or

The first impeller is an oblique flow impeller, and the second impeller is an axial flow impeller; or the first impeller and the second impeller are both axial-flow impellers.

In some embodiments, the at least two impellers include a first impeller and a second impeller, the first impeller and the second impeller are arranged at intervals in the first direction, and the first impeller and the second impeller are both arranged at one end of the rotating shaft, which is close to the air inlet.

In some embodiments, the multi-stage wind turbine further comprises an aft guide vane coupled to the housing assembly and positioned within the housing cavity, the aft guide vane positioned between the first and second impellers; and/or

The first impeller and the second impeller are both axial-flow impellers.

In some embodiments, a first back plate, a first thrust bearing, a thrust disc, a second thrust bearing, a first radial bearing, a second radial bearing and a second back plate are sequentially sleeved on the rotating shaft along a direction from the air inlet to the air outlet, the first back plate, the first radial bearing, the second radial bearing and the second back plate are respectively connected with the housing assembly, the first radial bearing and the second radial bearing are arranged at intervals in the first direction, and in the longitudinal section of the rotating shaft, the projection of the motor stator is located between the projections of the first radial bearing and the second radial bearing.

In some embodiments, the first thrust bearing, the second thrust bearing, the first radial bearing, and the second radial bearing are all air bearing bearings.

In some embodiments, the housing assembly comprises:

a housing;

the inner shell is positioned in the inner cavity of the outer shell, a flowing space for air flowing is formed between the inner shell and the outer shell, the flowing space is communicated with the air inlet and the air outlet, and the motor stator is arranged on the inner peripheral wall surface of the inner shell;

the first flow guiding housing is connected with the shell and provided with the air inlet; and

the second flow guide housing is connected with the shell and provided with the air outlet;

the impeller is located in an inner cavity of the first flow guiding shell and/or located in an inner cavity of the second flow guiding shell.

In some embodiments, the casing assembly further includes a plurality of baffles, the baffles extend in the first direction and are inclined toward the circumferential direction of the inner casing, the baffles are connected between the inner circumferential wall surface of the outer casing and the outer circumferential wall surface of the inner casing, and the plurality of baffles are arranged at intervals in the circumferential direction of the inner casing.

In some embodiments, the inner housing has a liquid containing space for containing a cooling liquid, the liquid containing space is located in a wall of the inner housing and surrounds an outer circumferential side of the inner cavity of the inner housing, a liquid outlet and a liquid inlet which are communicated with the liquid containing space are arranged on a wall surface of the outer housing, and the liquid outlet and the liquid inlet are arranged at intervals in the first direction.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of a multistage fan according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of a portion of the multi-stage blower of FIG. 1;

fig. 3 is a schematic structural diagram of a second embodiment of the multistage fan according to the embodiment of the present invention;

FIG. 4 is an enlarged schematic view of a portion of the multi-stage blower of FIG. 3;

fig. 5 is a schematic structural diagram of a third embodiment of the multistage fan according to the embodiment of the present invention.

Reference numerals are as follows:

1. a housing assembly; 101. an air inlet; 102. an air outlet; 103. a housing; 104. an inner shell; 1041. a liquid containing space; 1042. a liquid outlet; 1043. a liquid inlet; 105. a first flow guiding housing; 106. a second flow guiding housing; 107. a baffle; 108. a bearing seat; 2. a motor stator; 3. a rotating shaft; 4. an impeller; 401. a first impeller; 402. a second impeller; 5. a rear guide vane; 6. a second back plate; 7. a first back plate; 8. a first thrust bearing; 9. a thrust disc; 10. a second thrust bearing; 11. a first radial bearing; 12. a second radial bearing; 13. an air inlet guide sleeve; 14. an air outlet flow guide cover.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

A multistage fan according to an embodiment of the present invention is described below with reference to fig. 1 to 5.

As shown in fig. 1 to 5, a multi-stage fan according to an embodiment of the present invention includes a housing assembly 1, a motor stator 2, a rotating shaft 3 serving as a motor rotor, and an impeller 4. The housing assembly 1 has an air inlet 101, a housing inner cavity and an air outlet 102 sequentially arranged along a first direction (left and right direction as shown in the figure) and communicated with each other. Specifically, as shown in fig. 1, fig. 3 and fig. 5, the left end of the housing assembly 1 is provided with an air inlet 101, the right end is provided with an air outlet 102, and a housing inner cavity between the air inlet 101 and the air outlet 102 simultaneously forms a flow space for air flow and an installation space for installing the motor stator 2, the rotating shaft 3 and the impeller 4.

The motor stator 2 is connected with the shell assembly 1 and is positioned in the inner cavity of the shell. Specifically, as shown in fig. 1, 3 and 5, the motor stator 2 is cylindrical and surrounds a circle in the left-right direction, and the outer circumferential wall surface of the motor stator 2 is connected to the inner circumferential wall surface of the middle part of the housing assembly 1.

The rotating shaft 3 extends along the first direction and is positioned in the inner cavity of the shell, and part of the rotating shaft 3 penetrates through the motor stator 2. Specifically, as shown in fig. 1, 3 and 5, the rotating shaft 3 extends in the left-right direction, and the middle portion of the rotating shaft 3 is inserted into the motor stator 2, so that the rotating shaft 3 and the motor stator 2 form a motor, preferably a permanent magnet synchronous motor, the left end of the rotating shaft 3 extends leftwards from the left end of the motor stator 2, and the right end of the rotating shaft 3 extends rightwards from the right end of the motor stator 2. Of course, in other embodiments, only the left end or only the right end of the rotating shaft 3 may extend out of the motor stator 2.

Impeller 4 establishes on the outer peripheral face of pivot 3, and impeller 4 is located the casing intracavity, impeller 4 is at least two, at least two impeller 4 are arranged along the axis direction interval of pivot 3, it is concrete, as shown in fig. 1, fig. 3 and fig. 5, at least two impeller 4 are arranged at the interval in the left and right sides direction, and establish on the part that pivot 3 stretches out motor stator 2, thereby drive impeller 4 through pivot 3 and revolute the axial rotation of pivot 3, make the air current that gets into multistage fan from air intake 101 at the in-process route two at least impeller 4 and do work step by step to air outlet 102 flows, in order to promote the work efficiency of fan.

The utility model discloses multistage fan directly sets up motor stator at housing assembly, sets up two at least impellers in the pivot that is used as electric motor rotor simultaneously to simplified the complexity of multistage fan, made the utility model discloses multistage fan has simple structure and small advantage, and can reduce multistage fan's manufacturing cost.

In some embodiments, the at least two impellers 4 include a first impeller 401 and a second impeller 402, the first impeller 401 is disposed at one end of the rotating shaft 3 adjacent to the air inlet 101, and the second impeller 402 is disposed at the other end of the rotating shaft 3 adjacent to the air outlet 102.

In the embodiment shown in fig. 1 and the embodiment shown in fig. 3, the first impeller 401 is disposed on the outer circumferential surface of the left end of the rotating shaft 3, and the first impeller 401 is located between the air intake opening 101 and the left end of the motor stator 2, the second impeller 402 is disposed on the outer circumferential surface of the right end of the rotating shaft 3, and the second impeller 402 is located between the air outlet opening 102 and the right end of the motor stator 2.

In some embodiments, the multi-stage fan of the present invention further includes a rear guide vane 5, the rear guide vane 5 is connected to the housing assembly 1 and located in the housing inner cavity, and the rear guide vane 5 is located downstream of the second impeller 402.

In the embodiment shown in fig. 1 and the embodiment shown in fig. 3, the inner peripheral wall surface of the casing assembly 1 is further provided with a rear guide vane 5 which surrounds the left and right direction by one circle, and the rear guide vane 5 is located between the second impeller 402 and the air outlet 102, so as to rotate the deflected air flow formed after passing through the second impeller 402 back to the axial direction and then discharge the air flow from the air outlet 102.

In some embodiments, the first impeller 401 is a diagonal flow impeller and the second impeller 402 is an axial flow impeller; or both the first impeller 401 and the second impeller 402 are axial flow impellers.

In the embodiment shown in fig. 1, the first impeller 401 is a diagonal flow impeller and the second impeller 402 is an axial flow impeller.

In the embodiment shown in fig. 3, the first impeller 401 and the second impeller 402 are both axial flow impellers.

The airflow entering from the air inlet 101 performs primary work at the first impeller 401 to form high-pressure rotating airflow, and the high-pressure rotating airflow flows rightwards to the second impeller 402 to perform secondary work and is then discharged from the air outlet 102.

The impeller 4 adopts an oblique flow impeller or an axial flow impeller, which can improve the working efficiency compared with a centrifugal impeller, and reduce the radial size and the manufacturing cost of the impeller 4.

In some embodiments, the at least two impellers 4 include a first impeller 401 and a second impeller 402, the first impeller 401 and the second impeller 402 are spaced in the first direction, and both the first impeller 401 and the second impeller 402 are disposed at one end of the rotating shaft 3 adjacent to the air inlet 101.

In the embodiment shown in fig. 5, the first impeller 401 and the second impeller 402 are both disposed at the left end of the rotating shaft 3 and located between the air inlet 101 and the left end of the motor stator 2, and the first impeller 401 and the second impeller 402 are sequentially arranged at intervals in the left-right direction.

In some embodiments, the multi-stage fan of the embodiment of the present invention further includes a rear guide vane 5, the rear guide vane 5 is connected to the housing assembly 1 and located in the housing inner cavity, and the rear guide vane 5 is located between the first impeller 401 and the second impeller 402.

In the embodiment shown in fig. 5, the inner peripheral wall surface of the casing assembly 1 is further provided with a rear guide vane 5 surrounding the left-right direction for one circle, and the rear guide vane 5 is located between the first impeller 401 and the second impeller 402, so as to rotate the deflected airflow formed by the airflow passing through the first impeller 401 back to the axial direction, then move to the second impeller 402 to perform secondary work,

in some embodiments, the first impeller 401 and the second impeller 402 are both axial flow impellers.

In the embodiment shown in fig. 5, the first impeller 401 and the second impeller 402 are both axial flow impellers.

The impeller 4 adopts an axial-flow impeller, which can improve the acting efficiency compared with a centrifugal impeller, and reduce the radial size and the manufacturing cost of the impeller 4.

It is to be understood that the impellers are not limited to including only the first and second impellers, and in other embodiments there may be more than two impellers.

It is understood that in other embodiments, the multi-stage fan may not be provided with rear guide vanes.

It will be appreciated that in other embodiments, the impeller may alternatively be a centrifugal impeller.

In some embodiments, a first back plate 7 is sequentially sleeved on the rotating shaft 3 along a direction from the air inlet 101 to the air outlet 102, the first thrust bearing 8, the thrust disc 9, the second thrust bearing 10, the first radial bearing 11, the second radial bearing 12 and the second back plate 6 are respectively connected to the housing assembly 1, the first back plate 7, the first radial bearing 11, the second radial bearing 12 and the second back plate 6 are arranged at intervals in the first direction, and in a longitudinal section of the rotating shaft 3, a projection of the motor stator 2 is located between projections of the first radial bearing 11 and the second radial bearing 12.

As shown in fig. 1 to 5, a first back plate 7 is sequentially sleeved on the outer peripheral surface of the middle portion of the rotating shaft 3 along the left-to-right direction, a first thrust bearing 8, a thrust disc 9, a second thrust bearing 10, a first radial bearing 11, a second radial bearing 12 and a second back plate 6 are respectively connected with the housing assembly 1, on the longitudinal section of the rotating shaft 3, the projection of the motor stator 2 is located between the projections of the first radial bearing 11 and the second radial bearing 12, a plane parallel to the left-to-right direction and passing through the central axis of the rotating shaft 3 is the longitudinal section of the rotating shaft 3, and a plane orthogonal to the left-to-right direction is the cross section of the rotating shaft 3. The first thrust bearing 8 and the second thrust bearing 10 serve to balance the axial force of the rotating shaft 3, and the first radial bearing 11 and the second radial bearing 12 serve to support the rotating shaft 3. The shape of the first back plate 7 is adaptively adjusted according to the positions and installation positions of the first impeller 401 and the second impeller 402, in the embodiment shown in fig. 1, since the first impeller 401 is an oblique flow impeller, the left end surface of the first back plate 7 is a plane adapted to the oblique flow impeller, and in the embodiment shown in fig. 3 and 5, since the impeller 4 and the first back plate 7 have a certain distance therebetween, the left end surface of the first back plate 7 is set to be an arc surface having a flow guiding effect on the air flow. The right end face of the second back plate 6 is set to be an arc face with a flow guiding effect on air flow.

In some embodiments, the first thrust bearing 8, the second thrust bearing 10, the first radial bearing 11, and the second radial bearing 12 are all air bearings, so that air is used as a lubricant during the operation of the multi-stage fan, and an additional lubricating oil system is not required.

In some embodiments, the housing assembly 1 includes an outer shell 103, an inner shell 104, a first fairing shell 105, and a second fairing shell 106.

The inner casing 104 is located in the inner cavity of the outer casing 103, a flow space for air flow is formed between the inner casing 104 and the outer casing 103, the flow space is communicated with the air inlet 101 and the air outlet 102, and the motor stator 2 is arranged on the inner peripheral wall surface of the inner casing 104.

Specifically, as shown in fig. 1 to 5, the inner housing 104 is cylindrical and located in the inner cavity of the outer housing 103 and surrounds the left-right direction by a circle, the right end of the inner housing 104 is provided with a protrusion extending inward, the left end face of the second back plate 6 is connected to the right end face of the inner housing 104, the outer peripheral wall face of the second radial bearing 12 is connected to the inner peripheral wall face of the protrusion, the left side of the inner housing 104 is provided with a bearing seat 108, the outer peripheral wall face of the first radial bearing 11 is connected to the bearing seat 108, the motor stator 2 is located between the bearing seat 108 and the protrusion, the motor stator 2 and the bearing seat 108 are located between the motor stator 2 and the protrusion, and a gap is formed between the motor stator 2 and the protrusion, and the outer peripheral wall face of the first back plate 7 is connected to the inner peripheral wall face of the left side of the inner housing 104.

The first flow guiding housing 105 is connected with the housing 103, the first flow guiding housing 105 is provided with an air inlet 101, the second flow guiding housing 106 is connected with the housing 103, the second flow guiding housing 106 is provided with an air outlet 102, and the impeller 4 is positioned in an inner cavity of the first flow guiding housing 105 and/or an inner cavity of the second flow guiding housing 106.

Specifically, as shown in fig. 1 and fig. 3 and fig. 5, the left end of the outer shell 103 is connected to the first flow guiding housing 105, the left end of the first flow guiding housing 105 is provided with the air inlet 101, a portion of the first flow guiding housing 105 is flared in the left-to-right direction, the cross-sectional area of the air inlet 101 is smaller than that of the inner cavity of the outer shell 103, the right end of the outer shell 103 is connected to the outer shell 103, the right end of the second flow guiding housing 106 is provided with the air outlet 102, a portion of the second flow guiding housing 106 is necked-in the left-to-right direction, the cross-sectional area of the air outlet 102 is smaller than that of the inner cavity of the outer shell 103, the air flow enters the flow space formed between the inner shell 104 and the outer shell 103 under the flow guiding effect formed by the cooperation of the oblique flow impeller or the first back plate 7 and the flared portion of the first flow guiding housing 105, and moves from left to right in the flow space, and then is discharged from the air outlet 102 under the flow guiding effect formed by the cooperation of the necked-in cooperation of the second back plate 6 and the necked-in portion of the second flow guiding housing 106.

In the embodiment shown in fig. 1 and the embodiment shown in fig. 3, the first impeller 401 is located in the interior cavity of the first nacelle housing 105 and the second impeller 402 is located in the interior cavity of the second nacelle housing 106.

In the embodiment shown in fig. 5, the first impeller 401 and the second impeller 402 are both located within the interior cavity of the first nacelle housing 105.

It will be appreciated that in other embodiments, the first and second flow guide shells may be provided as a unitary structure with the housing.

It will be appreciated that in other embodiments, the right end of the inner housing may be provided with a further bearing seat instead of the projection, the peripheral wall surface of the second radial bearing being connected to the bearing seat.

In some embodiments, as shown in fig. 1, 3 and 5, the left end of the rotating shaft 3 is provided with an air inlet guide sleeve 13, and the right end of the rotating shaft 3 is provided with an air outlet guide sleeve 14, so as to guide the airflow and reduce the flow loss.

In some embodiments, the shell assembly 1 further includes a plurality of flow guiding plates 107, the flow guiding plates 107 extend along the first direction and are arranged obliquely towards the circumferential direction of the inner shell 104, the flow guiding plates 107 are connected between the inner circumferential wall surface of the outer shell 103 and the outer circumferential wall surface of the inner shell 104, and the plurality of flow guiding plates 107 are arranged at intervals along the circumferential direction of the inner shell 104.

As shown in fig. 1, 3 and 5, the guide plates 107 are connected between the inner peripheral wall surface of the outer shell 103 and the outer peripheral wall surface of the inner shell 104, the guide plates 107 extend in the left-right direction and are arranged in an inclined manner toward the circumferential direction of the inner shell 104, the plurality of guide plates 107 are arranged at intervals along the circumferential direction of the inner shell 104, the inclined directions of the plurality of guide plates 107 are the same, a flow passage for air flow to pass through is formed between two adjacent guide plates 107, the flow space between the inner shell 104 and the outer shell 103 is divided into a plurality of flow passages by the plurality of guide plates 107, and the direction of the air flow is guided by the guide plates 107.

It will be appreciated that in other embodiments, the housing assembly may not have a baffle.

In some embodiments, the inner casing 104 has a liquid containing space 1041 for containing a cooling liquid, the liquid containing space 1041 is located in a wall of the inner casing 104 and surrounds an outer periphery of an inner cavity of the inner casing 104, an outer periphery wall surface of the outer casing 103 is provided with a liquid outlet 1042 and a liquid inlet 1043 which are communicated with the liquid containing space 1041, and the liquid outlet 1042 and the liquid inlet 1043 are arranged at an interval in the first direction.

As shown in fig. 1, 3 and 5, a liquid containing space 1041 is provided in a wall of the inner casing 104, the liquid containing space 1041 surrounds a circumference in a left-right direction and surrounds an outer circumferential side of an inner cavity of the inner casing 104, and the liquid containing space 1041 corresponds to the motor stator 2 in position so as to perform heat exchange with the motor stator 2 through the cooling liquid in the liquid containing space 1041, thereby dissipating heat from the motor stator 2. The periphery wall of shell 103 is equipped with liquid outlet 1042 and inlet 1043 with holding liquid space 1041 intercommunication, liquid outlet 1042 and inlet 1043 are arranged at the interval on the left right direction, and inlet 1043 is located the right side of liquid outlet 1042, liquid outlet 1042 and inlet 1043 can be through running through the pipeline in flow space respectively with holding liquid space 1041 intercommunication, also can be through setting up the through-hole on guide plate 107 respectively with holding liquid space 1041 intercommunication, thereby let in the coolant liquid in holding liquid space 1041 through inlet 1043, and lead out the coolant liquid through liquid outlet 1042, in order to take out motor stator 2's heat. Preferably, a spiral liquid guide plate extending along the circumferential direction of the inner shell 104 is disposed in the liquid containing space 1041 so as to form a spiral flow channel in the liquid containing space 1041, and the cooling liquid moves along the spiral flow channel in the liquid containing space 1041, so as to improve the heat dissipation effect.

It is understood that in other embodiments, the spiral liquid guide plate may not be disposed in the liquid containing space; the inlet port may also be located to the left of the outlet port.

In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "left", "right", "axial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used merely to distinguish one element from another, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations to the above embodiments by those of ordinary skill in the art are intended to be within the scope of the present invention.

Claims

1. A multi-stage fan, comprising:

the air conditioner comprises a shell component (1), wherein the shell component (1) is provided with an air inlet (101), a shell inner cavity and an air outlet (102) which are sequentially arranged and communicated along a first direction;

the motor stator (2) is connected with the shell assembly (1) and is positioned in the shell inner cavity;

the rotating shaft (3) is used as a motor rotor, the rotating shaft (3) extends along a first direction and is positioned in the inner cavity of the shell, and part of the rotating shaft (3) penetrates through the motor stator (2);

the impeller (4) is arranged on the outer peripheral surface of the rotating shaft (3), the impeller (4) is located in the inner cavity of the shell, the number of the impellers (4) is at least two, and the impellers (4) are arranged at intervals in the axis direction of the rotating shaft (3).

2. The multi-stage fan according to claim 1, wherein the at least two impellers (4) comprise a first impeller (401) and a second impeller (402), the first impeller (401) is disposed at one end of the rotating shaft (3) adjacent to the air inlet (101), and the second impeller (402) is disposed at the other end of the rotating shaft (3) adjacent to the air outlet (102).

3. The multi-stage fan of claim 2 further comprising an aft vane (5), the aft vane (5) coupled to the housing assembly (1) and located within the housing cavity, the aft vane (5) located downstream of the second impeller (402); and/or

The first impeller (401) is an oblique flow impeller, and the second impeller (402) is an axial flow impeller; or both the first impeller (401) and the second impeller (402) are axial flow impellers.

4. The multi-stage fan according to claim 1, wherein the at least two impellers (4) comprise a first impeller (401) and a second impeller (402), the first impeller (401) and the second impeller (402) are arranged at intervals in the first direction, and the first impeller (401) and the second impeller (402) are both arranged at one end of the rotating shaft (3) close to the air inlet (101).

5. The multi-stage wind turbine as claimed in claim 4, further comprising an aft guide vane (5), the aft guide vane (5) being connected to the housing assembly (1) and located within the housing cavity, and the aft guide vane (5) being located between the first impeller (401) and the second impeller (402); and/or

The first impeller (401) and the second impeller (402) are both axial flow impellers.

6. The multistage fan according to any one of claims 1 to 5, wherein a first back plate (7), a first thrust bearing (8), a thrust disc (9), a second thrust bearing (10), a first radial bearing (11), a second radial bearing (12) and a second back plate (6) are sequentially sleeved on the rotating shaft (3) along a direction from the air inlet (101) to the air outlet (102), the first back plate (7), the first radial bearing (11), the second radial bearing (12) and the second back plate (6) are respectively connected with the housing assembly (1), the first radial bearing (11) and the second radial bearing (12) are arranged at intervals in the first direction, and in a longitudinal section of the rotating shaft (3), a projection of the motor stator (2) is located between projections of the first radial bearing (11) and the second radial bearing (12).

7. The multistage fan according to claim 6, wherein the first thrust bearing (8), the second thrust bearing (10), the first radial bearing (11) and the second radial bearing (12) are all air bearings.

8. The multistage fan according to any of claims 1 to 5, characterized in that the housing assembly (1) comprises:

a housing (103);

the inner shell (104) is positioned in an inner cavity of the outer shell (103), a flow space for air flow is formed between the inner shell (104) and the outer shell (103), the flow space is communicated with the air inlet (101) and the air outlet (102), and the motor stator (2) is arranged on the inner peripheral wall surface of the inner shell (104);

the first flow guiding housing (105), the first flow guiding housing (105) is connected with the shell (103), and the first flow guiding housing (105) is provided with the air inlet (101); and

the second flow guiding shell (106), the second flow guiding shell (106) is connected with the shell (103), and the second flow guiding shell (106) is provided with the air outlet (102);

the impeller (4) is located in an inner cavity of the first flow guiding housing (105) and/or in an inner cavity of the second flow guiding housing (106).

9. The multi-stage wind turbine according to claim 8, wherein the casing assembly (1) further comprises a plurality of flow guiding plates (107), the flow guiding plates (107) extend along the first direction and are arranged obliquely towards the circumferential direction of the inner casing (104), the flow guiding plates (107) are connected between the inner circumferential wall surface of the outer casing (103) and the outer circumferential wall surface of the inner casing (104), the flow guiding plates (107) are multiple, and the flow guiding plates (107) are arranged at intervals along the circumferential direction of the inner casing (104).

10. The multi-stage fan as claimed in claim 8, wherein the inner casing (104) has a liquid containing space (1041) for containing a cooling liquid, the liquid containing space (1041) is located in a wall of the inner casing (104) and surrounds an outer periphery of the inner cavity of the inner casing (104), an outer peripheral wall surface of the outer casing (103) is provided with a liquid outlet (1042) and a liquid inlet (1043) which are communicated with the liquid containing space (1041), and the liquid outlet (1042) and the liquid inlet (1043) are arranged at an interval in the first direction.