CN117570044A

CN117570044A - Axial flow blower

Info

Publication number: CN117570044A
Application number: CN202311674975.8A
Authority: CN
Inventors: 钟明桥; 巫灵丽; 姚卡; 程明树; 薛彪
Original assignee: Shijia Toubo Chengdu Technology Co ltd
Current assignee: Shijia Toubo Chengdu Technology Co ltd
Priority date: 2023-12-06
Filing date: 2023-12-06
Publication date: 2024-02-20

Abstract

The application provides an axial flow blower, which is used in the technical field of blowers, in particular to an axial flow blower, and comprises a motor shell component, an air inlet casing, a rotor casing and an exhaust casing; the motor shell assembly comprises a motor outer shell and a motor inner shell which are mutually sleeved, and a motor shell airflow channel is formed between the motor outer shell and the motor inner shell; the air inlet casing, the rotor casing, the motor casing assembly and the exhaust casing are sequentially connected; the air inlet casing, the rotor casing, the motor casing airflow channel and the exhaust channel are mutually communicated to form a main airflow channel, and air sequentially flows through the air inlet casing, the rotor casing and the motor casing airflow channel from an inlet of the air inlet casing, and then flows through an exhaust channel formed between an exhaust casing shell and a tail cone to be converged to an outlet of the exhaust casing for discharge. According to the axial flow blower, the motor inner layer shell is cooled by utilizing the main air flow, so that the motor stator is cooled, and the water cooling system is not required to be added to strengthen the heat dissipation of the motor.

Description

Axial flow blower

Technical Field

The application relates to the technical field of blowers, in particular to an axial flow blower.

Background

At present, a Roots blower and a large-size low-rotation-speed centrifugal blower are generally adopted as conventional aquaculture blowers on the market.

The Luo Chi fan has the advantages of simple structure, high reliability, large noise, large volume and high energy consumption.

The advantage of a large size low rotational speed centrifugal blower is high efficiency. The disadvantages are large volume, high impeller manufacturing cost, complex structure and low reliability. Meanwhile, a water cooling system is required to be added to strengthen heat dissipation of the motor, the complexity of control is increased due to the water cooling system, and the reliability of the whole system is reduced due to the high failure rate of the water pump. The design of the low-rotation-speed centrifugal blower adopts the ball bearing, lubricating grease is required to be added to the bearing by periodically disassembling the machine, the maintenance cost is high, and the maintenance awareness of the cultivation industry on equipment is low.

Disclosure of Invention

In view of this, this application provides an axial-flow blower, cools off motor inlayer casing through utilizing own main air current, and then has realized cooling off motor stator, need not to increase water cooling system and strengthens motor heat dissipation.

In order to achieve the above purpose, the present application provides the following technical solutions:

an axial flow blower includes a motor housing assembly, an intake casing, a rotor casing, and an exhaust casing;

the motor shell assembly comprises a motor outer shell and a motor inner shell which are mutually sleeved, and a motor shell airflow channel is formed between the motor outer shell and the motor inner shell;

the exhaust casing comprises a shell and a tail cone which are mutually sleeved, and an exhaust channel is formed between the shell and the tail cone;

the air inlet casing, the rotor casing, the motor casing assembly and the exhaust casing are sequentially connected, the air inlet casing, the rotor casing, the motor casing airflow channel and the exhaust channel are mutually communicated and form a main airflow channel, air sequentially flows through the air inlet casing, the rotor casing and the motor casing airflow channel through an inlet of the air inlet casing, and then is converged to an outlet of the exhaust casing through the exhaust channel to be discharged.

Optionally, motor casing guide vanes are further arranged between the motor outer casing and the motor inner casing.

Optionally, be provided with motor stator in the motor inlayer casing, motor stator wraps up outward and has the heat conduction to glue, the heat conduction glue with motor inlayer casing looks butt.

Optionally, a motor stator and a rotor assembly are arranged in the motor inner shell, a main shaft of the rotor assembly penetrates through the motor stator, and the rotor assembly is supported and arranged in the axial flow blower through a radial air bearing and a thrust air bearing.

Optionally, a motor stator is arranged in the motor inner shell, and the axial flow blower further comprises a rotor assembly, wherein the rotor assembly comprises a main shaft, a thrust disc, a blade disc and a balance disc;

the inlet end and the outlet end of the motor inner shell are respectively connected with a front bearing seat and a rear bearing seat, the main shaft is arranged in the front bearing seat and the rear bearing seat in a penetrating manner, and the rotor assembly is supported by a radial air bearing and a thrust air bearing;

the inlet end of the motor outer shell is connected with the rotor case, and the outlet end of the motor outer shell is connected with the shell of the exhaust case;

the She Pangu is arranged at the front end of the main shaft and is positioned in the rotor case, the rear end of the leaf disc is abutted against the front bearing seat, a negative pressure area is formed at the front end of the leaf disc, and a first leakage area is formed between the leaf disc and the front bearing seat;

the tail cone of the exhaust casing is arranged at the rear end of the rear bearing seat, and a gap exists between the tail cone of the exhaust casing and the rear bearing seat;

the balance disc is arranged at the rear end of the main shaft and is positioned in the tail cone cavity of the exhaust casing, and a second leakage area is formed between the balance disc and the tail cone of the exhaust casing;

a cooling airflow passage is arranged in the axial flow blower, and the gas in the main airflow passage can flow through the cooling airflow passage and cool the rotor assembly.

Optionally, the cooling airflow passage is: the gas in the main gas flow channel sequentially flows through a gap between the rear bearing seat and the tail cone of the exhaust casing, a gap between the thrust air bearing, a gap between the main shaft and the rear bearing seat, a gap between the main shaft and the motor stator, a gap between the main shaft and the front bearing seat and a vent hole arranged on the impeller disc, and flows out through the vent hole of the impeller disc and is converged into the main gas flow channel; .

Optionally, the motor inlayer casing with the vent casing is connected one end circumference evenly distributed has the air vent, the gas in the main air current passageway can pass through the air vent flows in proper order the inner chamber of motor inlayer casing, the motor stator with clearance between the main shaft, the front bearing frame with clearance between the main shaft, and through the air vent outflow of leaf dish and meet to the main air current passageway.

Optionally, a first comb structure is arranged on an abutting surface of the abutting part of the leaf disc and the front bearing seat.

Optionally, a second comb structure is arranged on the periphery of the balance disc, and the second comb structure is abutted to the tail cone of the exhaust casing.

Optionally, an air guiding pipe is arranged between the negative pressure area and the second leakage area, and the air in the second leakage area can flow to the negative pressure area through the air guiding pipe.

Optionally, at least one high-pressure vent hole is formed in the tail cone of the exhaust casing, at least one low-pressure vent hole is also formed in the front side of the rotor casing, and the high-pressure vent hole and the low-pressure vent hole are communicated through the air entraining pipe.

The utility model provides an axial fan, with the cartridge receiver that admits air, the rotor cartridge receiver, motor casing air current passageway and exhaust passage communicate each other and form main air current passageway, and motor casing air current passageway is as a district that constitutes main air current passageway, when there is the air current to pass through in main air current passageway, also necessarily there is the air current to pass through in the motor casing air current passageway, consequently, axial fan's main air current can take away the heat of the motor inlayer casing that forms motor casing air current passageway, and then take away the heat of stator, thereby realize for motor radiating purpose, just so need not to set up heat abstractor such as extra water cooling plant to the motor, thereby simplified axial fan's structure.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.

FIG. 1 is a schematic structural view of an axial flow blower of the present application;

FIG. 2 is a schematic diagram of a motor glue-pouring assembly according to one embodiment of the present application;

FIG. 3 is a schematic view of a rotor assembly of the axial flow blower of the present application;

FIG. 4 is an enlarged view of FIG. 1 at A;

FIG. 5 is an enlarged view of FIG. 1 at B;

FIG. 6 is a schematic view of the different pressure zones in the axial flow blower of the present application;

fig. 7 is a schematic view of a gas flow path of the axial flow blower of the present application.

In fig. 1-7:

1. a motor glue pouring assembly; 11. a motor housing assembly; 111. a motor housing; 1111. an inner shell of the motor; 1111-1, and vent holes; 1112. an outer shell of the motor; 1113. a motor housing vane; 112. a motor stator; 12. a heat-conducting adhesive;

2. an air inlet casing; 3. a rotor casing; 4. an exhaust casing;

51. a main shaft; 511. a left end shaft; 512. a right end shaft; 513. a middle sleeve; 514. magnetic steel; 52. a thrust plate; 53. a leaf disc; 531. a first comb structure; 54. a balancing disk; 541. a second comb structure; 55. a left lock nut; 56. a right lock nut;

6. a front bearing seat; 7. a rear bearing seat; 8. a radial air bearing; 9. a thrust air bearing; 10. and (5) introducing air pipes.

Detailed Description

The application provides an axial-flow blower cools off motor inlayer casing through utilizing own main air current, and then has realized cooling off motor stator, need not to increase water cooling system and strengthens motor heat dissipation.

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

As shown in fig. 1-3, the present application provides an axial flow blower comprising a motor housing assembly 11, an intake casing 2, a rotor casing 3, and an exhaust casing 4;

the motor housing assembly 11 includes a motor housing 111, the motor housing 111 includes a motor outer housing 1112 and a motor inner housing 1111 which are sleeved with each other, the motor outer housing 1112 is disposed outside the motor inner housing 1111, and a motor housing airflow passage is formed between the motor outer housing 1112 and the motor inner housing 1111;

a motor housing vane 1113 is also disposed between the motor outer housing 1112 and the motor inner housing 1111;

the exhaust casing 4 comprises a shell and a tail cone which are mutually sleeved, and an exhaust channel is formed between the shell and the tail cone;

the air inlet casing 2, the rotor casing 3, the motor shell assembly 11 and the exhaust casing 4 are sequentially connected, the air inlet casing 2, the rotor casing 3, the motor shell airflow channel and the exhaust channel are mutually communicated to form an annular main airflow channel, and the inner layer of the main airflow channel is composed of an inner layer outer molded surface of the air inlet casing 2, an inner molded surface of a blade disc 53, an outer molded surface of a front bearing seat 6, an outer molded surface of a motor inner shell 1111, an outer molded surface of a rear bearing seat 7 and a tail cone outer molded surface of the exhaust casing 4; the outer layer of the main air flow channel consists of an inner molded surface of the outer layer of the air inlet casing 2, an inner molded surface of the rotor casing 3, an inner molded surface of the outer shell 1112 of the motor and an inner shell surface of the exhaust casing 4;

air sequentially flows through the air inlet casing 2, the rotor casing 3 and the motor shell airflow channel from the inlet of the air inlet casing 2, and then is converged to the outlet of the exhaust casing 4 through the exhaust channel to be discharged.

The design rule of the impeller machine is to ensure the same design pressure rise and flow, and the lower the rotation speed is, the smaller the size of the impeller 53 is, and the higher the efficiency is. In order to reduce the manufacturing cost, the design size is reduced as much as possible on the premise of ensuring the design efficiency, the reduction of the design size also means the reduction of the heat dissipation area, and the blower in the application adopts an axial flow type design, so that the flow rate is increased at low pressure;

according to the axial flow fan provided by the application, the air inlet casing 2, the rotor casing 3, the motor casing airflow channel and the exhaust channel are mutually communicated to form the main airflow channel (shown by solid arrow flow in fig. 7, air reaches the motor casing guide vane 1113 after being pressurized through the inlet guide vane by the blade disc 53, is further pressurized through the motor casing guide vane 1113, and finally is introduced into a scene needing wind such as a fish pond oxygenation pipeline through the outlet of the exhaust casing 4), the motor casing airflow channel is used as a section forming the main airflow channel, and airflow inevitably passes through the motor casing airflow channel when the main airflow passes through the main airflow channel, so that the heat of the motor inner layer casing 1111 forming the motor casing airflow channel can be taken away by the main airflow of the axial flow fan; the motor stator 112 is connected with the motor inner shell 1111 in an interference fit manner, and heat generated by the stator is sequentially transferred to the motor inner shell 1111, the motor shell guide vane 1113 and the motor outer shell 1112, and then the heat is taken away by the gas of the main gas flow channel.

Therefore, an additional heat dissipation device such as a water cooling device and the like is not required to be arranged on the motor, and the structure of the axial flow fan is simplified.

In a preferred embodiment, as shown in fig. 1, a motor casing vane 1113 is further disposed between the outer casing and the inner casing of the motor, and the motor casing vane 1113 not only performs the supercharging and rectifying effects on the main airflow channel, but also can serve as a heat dissipation fin to further improve the heat dissipation function.

In a preferred embodiment, as shown in fig. 2, which is a motor glue-pouring assembly 1 of the present application, the motor glue-pouring assembly 1 includes a motor housing assembly 11 and a heat-conducting glue 12, the motor housing assembly 11 further includes a motor stator 112, the motor stator 112 is disposed in a motor inner housing 1111, the heat-conducting glue 12 is wrapped outside the motor stator 112, and the heat-conducting glue 12 is abutted against the motor inner housing 1111.

In this embodiment, the motor stator 112 is completely wrapped by the heat-conducting glue 12, and the heat-conducting glue 12 is in a glue filling structure, that is, a high heat-conducting material is used to fill the gaps between windings of the motor stator 112, so that the contact area between the motor stator 112 and the motor inner layer casing 1111 can be increased, the heat dissipation effect of the motor stator 112 can be increased, and in addition, the heat-conducting glue 12 structure can also prevent the material of the motor stator 112 from being corroded.

As shown in fig. 1 and 3, in a preferred embodiment, a motor stator 112 and a rotor assembly are disposed within the motor inner housing 1111, with the main shaft 51 of the rotor assembly being disposed through the motor stator 112, and the rotor assembly being supported within the axial flow blower by the radial air bearing 8 and the thrust air bearing 9.

In the embodiment, the motor supports the rotor assembly in an air bearing design, the radial air bearing 8 is used for supporting the weight of the rotor assembly, and the thrust air bearing 9 is used for bearing the axial force born by the rotor assembly; compared with the ball bearing which needs to be periodically disassembled and lubricating grease is added to the bearing, the air bearing has the advantages of no maintenance and longer service life; preferably, the axial force to which the rotor assembly is subjected at each operating point of the axial flow blower is controlled to within 40-60N.

As shown in fig. 1, 3 and 6, in a preferred embodiment, a motor stator 112 is disposed within the motor inner housing 1111, and the axial flow blower further includes a rotor assembly including a main shaft 51, a thrust disc 52, a bladed disc 53 and a balance disc 54;

the blade disc 53, the thrust disc 52 and the balance disc 54 are fixed on the main shaft 51 through a left lock nut 55 and a right lock nut 56;

main shaft 51 includes left end shaft 511, right end shaft 512, middle sleeve 513, and magnetic steel 514;

the magnetic steel 514, the left end shaft 511 and the right end shaft 512 are integrated with the middle sleeve 513 in an interference manner;

the motor stator 112 is vertically aligned with the magnetic steel 514, a certain gap is kept in the circumferential direction, the motor stator 112 is electrified to generate a rotating magnetic field, and the rotating magnetic field and the magnetic steel 514 act together to enable the rotor assembly to perform rotating motion relative to the motor stator 112;

the inlet end and the outlet end of the motor inner shell 1111 are respectively connected with a front bearing seat 6 and a rear bearing seat 7, preferably, the front bearing seat 6 is fixedly connected with the inlet end of the motor inner shell 1111 into a whole, and the rear bearing seat 7 is fixedly connected with the outlet end of the motor inner shell 1111 into a whole;

the main shaft 51 is arranged in the front bearing seat 6 and the rear bearing seat 7 in a penetrating way, so that the rotor assembly is supported by the radial air bearing 8 and the thrust air bearing 9;

an inlet end of the motor outer shell 1112 is connected with the rotor case 3, and an outlet end of the motor outer shell 1112 is connected with a shell of the exhaust case 4; preferably, the rotor casing 3 is fixedly connected with the inlet end of the motor outer shell 1112, and the exhaust casing 4 is fixedly connected with the outlet end of the motor outer shell 1112;

the inlet casing 2 and the inlet end of the rotor casing 3 are fixedly connected into a whole;

the vane disc 53 is fixedly arranged at the front end of the main shaft 51 and positioned in the rotor case 3, the rear end of the vane disc 53 is abutted against the front bearing seat 6, a negative pressure area is formed at the front end of the vane disc 53, and a first leakage area is formed between the vane disc 53 and the front bearing seat 6;

the tail cone of the exhaust casing 4 is arranged at the rear end of the rear bearing seat 7, and a gap exists between the tail cone of the exhaust casing 4 and the rear bearing seat 7;

the balance disc 54 is arranged at the rear end of the main shaft 51 and is positioned in the tail cone cavity of the exhaust casing 4, and a second leakage area is formed between the balance disc 54 and the tail cone of the exhaust casing 4;

the axial flow blower is internally provided with a cooling airflow passage, and the gas in the main airflow passage can flow through the cooling airflow passage and cool the rotor assembly without arranging an additional cooling system.

As shown in fig. 6, in the axial flow blower, the air flow sequentially enters into a region B in front of the impeller from a region a with atmospheric pressure, the region B is the negative pressure region, after being pressurized by the impeller, the air flow enters into a region C behind the impeller, the region C is a secondary high pressure region, after being pressurized by the motor shell guide vane 1113 to the air flow in the main air flow channel, the air flow reaches a pressure region D, the region D is a high pressure region, then a part of the air flow enters into a region F with lower pressure through a gap between the motor inner shell 1111 and the tail cone of the exhaust casing 4, flows into a region H, I, J with lower pressure through a region G, and flows into the negative pressure region B through the vent holes on the impeller, so that circulation is formed;

the area I is a first leakage area formed between the impeller 53 and the front bearing seat 6, and because a gap exists between the impeller 53 and the front bearing seat 6, the pressure in the area C is greater than the pressure in the area I, so that part of the airflow in the secondary high pressure area C flows to the area I through the gap, that is, the area I is the first leakage area;

in addition, a second leakage area is formed between the balance disc 54 and the tail cone of the exhaust casing 4, because a gap exists between the balance disc 54 and the tail cone of the exhaust casing 4, and the pressure in the area F is higher than that in the area E, so that part of the airflow in the area F flows to the area E through the gap, that is, the area E is the second leakage area;

specifically, as shown by the dashed arrow in the chamber of the motor inner casing 1111 in fig. 7, the cooling airflow path is: the gas in the main gas flow passage flows through the clearance between the rear bearing housing 7 and the tail cone of the exhaust casing 4, the clearance of the thrust air bearing 9, the clearance between the main shaft 51 and the rear bearing housing 7, the clearance between the main shaft 51 and the motor stator 112, the clearance between the main shaft 51 and the front bearing housing 6, and the vent holes provided on the vane disk 53 in sequence, and flows out through the vent holes of the vane disk 53 and merges into the main gas flow passage.

Thus, the air in the main air flow channel enters the cavity of the motor inner layer shell 1111 through the clearance between the rear bearing seat 7 and the tail cone of the exhaust casing 4, and flows from the direction of the rear bearing seat 7 to the direction of the front bearing seat 6, so as to cool the rotor assembly, and then flows out from the vent holes on the impeller plate 53 and merges into the main air flow channel to form circulation, and the air flow cools the rotor assembly, so that the cooling effect is improved.

Further, in order to improve the cooling effect of the inside of the motor inner casing 1111 in the cooling air flow path, as shown in fig. 2, ventilation holes 1111-1 are uniformly distributed in the circumferential direction of the end of the motor inner casing 1111 connected to the exhaust casing 4, and the air in the main air flow path can flow into the inner cavity of the motor inner casing 1111 through the ventilation holes 1111-1 and cool the inner cavity of the motor inner casing 1111, specifically, the cooling air flow path is as follows: the air in the main air flow passage flows into the inner cavity of the motor layer housing, the gap between the motor stator 112 and the main shaft 51, the gap between the front bearing housing 6 and the main shaft 51, and flows out through the air holes of the vane disk 53 and merges into the main air flow passage in order, forming a cooling cycle.

As shown in fig. 4 and 6-7, in a preferred embodiment, the first comb structure 531 is provided on the abutment surface of the abutment portion of the blisk 53 and the front bearing block 6.

In order to reduce the magnitude of axial force borne by a rotor assembly, a sealing structure is adopted to separate a working medium high-pressure area from a working medium low-pressure area; in this embodiment, in order to prevent the gas at the area C of the secondary high pressure from entering the area I, i.e., the first leakage area, from the gap formed between the blisk 53 and the front bearing seat 6, thereby reducing the axial force applied to the inlet end after the blisk 53, the first comb tooth structure 531 is provided on the abutting surface of the abutting portion of the blisk 53 and the front bearing seat 6, so that the sealing performance between the balance disc 54 and the tail cone of the exhaust casing 4 is increased, thereby reducing the axial force applied to the rotor assembly.

As shown in fig. 5-7, in a preferred embodiment, the balance plate 54 is provided with a second grate structure 541 in the circumferential direction, and the second grate structure 541 abuts against the tail cone of the exhaust casing 4.

In order to reduce the magnitude of axial force borne by a rotor assembly, a sealing structure is adopted to separate a working medium high-pressure area from a working medium low-pressure area; similarly, in this embodiment, in order to prevent the gas in the region F between the exhaust casing 4 and the motor inner casing 1111 from flowing to the region E, that is, the second leakage region, through the gap between the balance disc 54 and the tail cone of the exhaust casing 4, so as to reduce the axial force applied to the inlet end after the balance disc 54, the second comb tooth structure 541 is disposed in the circumferential direction of the balance disc 54, and the second comb tooth structure 541 abuts against the tail cone of the exhaust casing 4, so that the sealing performance between the balance disc 54 and the tail cone of the exhaust casing 4 is increased, thereby reducing the axial force applied to the rotor assembly.

In a preferred embodiment, an air bleed duct 10 is provided between the negative pressure zone, i.e. zone B, and the second leakage zone, i.e. zone E, through which air bleed duct 10 the air in the second leakage zone can flow to the negative pressure zone, since the pressure in zone E is higher than in zone B.

In order to make the area cavity pressure of the whole rotor assembly reach an equilibrium state as far as possible, a mode of taking over air bleed can be adopted to lead the high-area leakage working medium to the low-pressure area, namely, an air guide pipe 10 is arranged between the negative-pressure area and the second leakage area, so that the air in the second leakage area can flow to the negative-pressure area through the air guide pipe 10, and the area cavity pressure of the rotor assembly reaches the equilibrium state.

Specifically, as shown in fig. 7, at least one high-pressure vent hole is formed in the tail cone of the exhaust casing 4, at least one low-pressure vent hole is also designed in the front side of the rotor casing 3, and the high-pressure vent hole and the low-pressure vent hole are communicated through an air guide pipe 10; preferably, 3-5 uniformly distributed high-pressure vent holes are circumferentially arranged on the tail cone of the exhaust casing 4, and 3-5 low-pressure vent holes with the same number as the high-pressure vent holes are also designed on the front side of the rotor casing 3, so that the high-pressure vent holes and the low-pressure vent holes are communicated by 3-5 air entraining pipes 10, and the balance state of the regional cavity pressure where the rotor assembly is located is realized.

The basic principles of the present application have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not limiting, and these advantages, benefits, effects, etc. are not to be considered as necessarily possessed by the various embodiments of the present application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not intended to be limited to the details disclosed herein as such.

The block diagrams of the devices, apparatuses, devices, systems referred to in this application are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The words "or" and "as used herein refer to the word" or "and are used interchangeably herein unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.

It is also noted that in the apparatus, devices and methods of the present application, the components or steps may be separated or recombined. Such decomposition or recombination should be considered as equivalent to the present application.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

It should be understood that the terms "first," "second," "third," "fourth," "fifth," and "sixth" used in the description of the embodiments of the present application are merely used for clarity in describing the technical solutions, and are not intended to limit the scope of the present application.

The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.

Claims

1. An axial flow blower is characterized by comprising a motor shell assembly, an air inlet casing, a rotor casing and an exhaust casing;

2. The axial flow blower of claim 1, further provided with motor housing vanes between the motor outer housing and the motor inner housing.

3. The axial flow blower of claim 1, wherein a motor stator is disposed in the motor inner housing, and wherein a heat conductive adhesive is wrapped around the motor stator, and wherein the heat conductive adhesive abuts against the motor inner housing.

4. The axial flow blower of claim 1, wherein a motor stator and a rotor assembly are disposed within the motor inner housing, a spindle of the rotor assembly is disposed within the motor stator, and the rotor assembly is disposed within the axial flow blower through a radial air bearing and a thrust air bearing support.

5. The axial flow blower of claim 1, wherein a motor stator is disposed within the motor inner housing, the axial flow blower further comprising a rotor assembly including a main shaft, a thrust disc, a blisk, a balance disc;

6. The axial flow blower of claim 5, wherein the cooling airflow path is: the gas in the main gas flow channel sequentially flows through a gap between the rear bearing seat and the tail cone of the exhaust casing, a gap between the thrust air bearing, a gap between the main shaft and the rear bearing seat, a gap between the main shaft and the motor stator, a gap between the main shaft and the front bearing seat and a vent hole arranged on the impeller disc, and flows out and merges into the main gas flow channel through the vent hole of the impeller disc.

7. The axial flow fan according to claim 6, wherein vent holes are uniformly distributed in the circumferential direction at one end of the motor inner shell connected to the exhaust casing, and the gas in the main gas flow passage can flow into the inner cavity of the motor inner shell, the gap between the motor stator and the main shaft, the gap between the front bearing block and the main shaft, and flow out through the vent holes of the vane disk and join to the main gas flow passage in sequence.

8. The axial flow blower according to claim 5, wherein a first comb structure is provided on an abutment surface of an abutment portion of the blisk and the front bearing block.

9. The axial flow blower according to claim 5, wherein a second comb structure is provided in a circumferential direction of the balance plate, and the second comb structure abuts against a tail cone of the exhaust casing.

10. The axial flow blower of claim 5, wherein a bleed air duct is disposed between the negative pressure region and the second leakage region, the gas in the second leakage region being capable of flowing through the bleed air duct to the negative pressure region; the tail cone of the exhaust casing is provided with at least one high-pressure vent hole, the front side of the rotor casing is also provided with at least one low-pressure vent hole, and the high-pressure vent hole is communicated with the low-pressure vent hole through the air entraining pipe.