Air suspension blower and cooling method

Abstract

The air suspension blower comprises a stator assembly, a rotor assembly and a volute, a partition plate and a bearing seat are arranged between the back face of an impeller and a motor stator, a thrust suspension bearing assembly is arranged between the partition plate and the bearing seat, and an area defined by the bearing seat, the motor stator and the front end of a machine shell forms a motor front end cavity. A motor rear end cavity is formed in an area defined by the motor stator and the rear end of the machine shell, a bearing seat cavity is formed between the bearing seat and the partition plate, an impeller back cavity is formed between the back face of the impeller and the partition plate, at least one volute ventilation hole is formed in the side wall of the volute, and a first machine shell air guiding hole is formed in the side, close to the bearing seat, of the machine shell. A second machine shell air guiding hole is formed in the side, close to the second radial suspension bearing, of the machine shell, a bearing seat air guiding hole is formed in the bearing seat, a bearing seat exhaust hole is further formed in the bearing seat, a partition plate exhaust hole is formed in the partition plate, and a machine shell air inlet hole is further formed in the machine shell. The end, close to the heat dissipation impeller assembly, of the machine shell is provided with a machine shell vent hole communicating with the heat dissipation impeller assembly.

Description

Technical Field

[0001] The invention relates to the technical field of fans, and in particular to an air suspension blower with a high-power air-cooling structure and a cooling method. Background Art

[0002] Due to the high power density of the motor and the severe heat dissipation temperature of the motor, high-power air suspension blowers generally use coolant circulation to cool the motor. This solution increases the cooling system, resulting in increased configuration, increased volume, increased costs, and new failure points. Some use air-cooled structures, which often fail because the motor cooling requires large air volume and low-pressure cooling air, while the bearing cooling requires small air volume and high-pressure cooling air, resulting in failure due to the inability to balance the cooling of the bearing and the motor. In addition, single-stage impellers often have a large axial force because the air pressure at the back of the impeller is greater than the inlet air pressure, and the axial force points to the impeller inlet, while the suspension bearing has a weak axial force balancing ability and is prone to failure.

[0003] For example, at present, there is a Chinese patent application publication number CN111917202A that discloses a cooling structure and cooling method for an air suspension blower motor, including an air suspension blower body and a support assembly, the air suspension blower body is installed on the support assembly, the air suspension blower body includes a motor housing, a heat dissipation volute, a stator and a rotor, the rotor is rotatably installed inside the motor housing through an air bearing, a plurality of heat dissipation slots are provided on the stator, the stator is installed on the inner wall of the motor housing, a first air flow channel is formed between the stator and the inner wall of the motor housing, and a second air flow channel is formed between the stator and the rotor; the support assembly includes a bottom bracket, a support block, an angle iron and a connecting block, the support block is installed on the upper part of the bottom bracket by bolts, the angle iron is installed on the upper part of the support block by bolts, one side of the connecting block is installed on the side wall of the angle iron by bolts, and the upper end of the connecting block is fixedly connected to the bottom of the motor housing by bolts. However, this patent does not use high-pressure wind to cool the bearing, and there are still problems that the bearing cooling and the motor cannot be taken into account at the same time, and the axial force balancing ability of the suspension bearing is weak and easy to fail.

[0004] Therefore, it is necessary to provide a new air cooling structure to solve the above problems of the air suspension blower. Summary of the invention

[0005] The object of the present invention is to provide an air suspension blower and a cooling method to solve the above-mentioned deficiencies and defects of the prior art.

[0006] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0007] An air suspension blower includes a stator assembly, a rotor assembly and a volute. The stator assembly includes a housing and a motor stator. The rotor assembly includes a main shaft. At both ends of the main shaft, a first radial suspension bearing and a second radial suspension bearing are respectively arranged. The first end of the main shaft is connected to an impeller, and the second end of the main shaft is connected to a heat dissipation impeller assembly. The first end of the housing is connected to the volute. Between the back of the impeller and the motor stator, a partition and a bearing housing are arranged. Between the partition and the bearing housing, a thrust suspension bearing assembly is arranged. The area surrounded by the bearing housing, the motor stator and the front end of the housing forms a front motor cavity. The area surrounded by the motor stator and the rear end of the housing forms a rear motor cavity. The area between the bearing housing and the partition forms a bearing housing cavity. The area between the back of the impeller and the partition forms an impeller back cavity. At least one volute vent hole is arranged on the side wall of the volute. On one side of the housing close to the bearing housing, a first housing air intake hole is arranged. On one side of the housing close to the second radial suspension bearing, a second housing air intake hole is arranged. The bearing housing is provided with a bearing housing air intake hole communicating with the first housing air intake hole and the thrust bearing cavity accommodating the thrust suspension bearing assembly. The bearing housing is also provided with a bearing housing exhaust hole communicating with the bearing housing cavity and the front motor cavity. The partition is provided with a partition exhaust hole communicating with the impeller back cavity and the bearing housing cavity. The housing is also provided with a housing air intake hole communicating with the front motor cavity. At one end of the housing close to the heat dissipation impeller assembly, a housing vent hole communicating with the heat dissipation impeller assembly is arranged. The high-pressure gas coming out of the volute vent hole passes through a cooler and then flows into the first housing air intake hole and the second housing air intake hole.

[0008] In a preferred embodiment of the present invention, the heat dissipation impeller assembly includes:

[0009] A heat dissipation impeller connected to the second end of the main shaft;

[0010] A cover shell connected to the outer peripheral surface of the second end of the housing. A cover shell cylinder covering the end of the second end of the main shaft is arranged on the cover shell;

[0011] A sealing sleeve arranged between the heat dissipation impeller and the second end of the main shaft. The sealing sleeve is in sealing fit with the inner peripheral surface of the second end of the housing.

[0012] In a preferred embodiment of the present invention, the heat dissipation impeller is fixed on the main shaft through a sub-tie rod and a sub-nut that cooperate with the second end of the main shaft.

[0013] In a preferred embodiment of the present invention, a radial comb tooth sealing structure is arranged on the inner peripheral surface of the second end of the housing. A sealing boss cooperating with the radial comb tooth sealing structure is arranged on the outer circle of the sealing sleeve.

[0014] In a preferred embodiment of the present invention, an impeller axial sealing structure is arranged between the outer periphery of the back of the impeller and the partition, and an impeller radial sealing structure is arranged between the inner periphery of the back of the impeller and the partition.

[0015] In a preferred embodiment of the present invention, the impeller axial sealing structure and the impeller radial sealing structure include a labyrinth sealing structure.

[0016] In a preferred embodiment of the present invention, the thrust floating bearing assembly includes:

[0017] A first thrust floating bearing and a second thrust floating bearing disposed at intervals between the partition plate and the bearing housing;

[0018] A thrust disk disposed on the inner circumference between the first thrust floating bearing and the second thrust floating bearing. The boss on the inner circumference of the impeller presses the thrust disk, so that the inner circumference of the thrust disk is fixed on the step of the main shaft;

[0019] Thrust pads disposed on the outer circumference between the first thrust floating bearing and the second thrust floating bearing.

[0020] In a preferred embodiment of the present invention, a positioning boss is provided at the first end of the main shaft and is adapted to the positioning groove on the back surface of the impeller.

[0021] In a preferred embodiment of the present invention, the impeller is fixed on the main shaft by a main pull rod and a main nut that cooperate with the first end of the main shaft.

[0022] For a cooling method of an air suspension blower according to any of the above technical solutions, during operation,

[0023] The high-pressure gas coming out of the air inlet hole of the volute passes through the cooler and then flows into the first casing air inlet hole and the second casing air inlet hole. The high-pressure gas entering from the first casing air inlet hole enters the thrust bearing cavity after passing through the bearing housing air inlet hole, cools the thrust floating bearing assembly, and then part of the high-pressure gas enters the impeller back cavity through the gap of the thrust floating bearing assembly, then enters the bearing housing cavity through the partition plate exhaust hole, and finally enters the front end cavity of the motor through the bearing housing exhaust hole; and the other part of the high-pressure gas after cooling the thrust floating bearing assembly enters the motor inner cavity after cooling the first radial floating bearing through the gap between the bearing housing and the main shaft; the high-pressure gas entering from the second casing air inlet hole cools the second radial floating bearing and enters the rear end cavity of the motor through the gap between the casing and the rear end of the main shaft;

[0024] Part of the air inhaled from the air inlet hole of the casing cools the outer wall of the motor through the air flow passage of the casing and enters the rear end cavity of the motor, and the other part of the air cools the inner wall of the motor stator and the main shaft through the motor inner cavity and then enters the rear end cavity of the motor;

[0025] The air in the front end cavity of the motor, the motor inner cavity, and the rear end cavity of the motor is communicated;

[0026] The cooling air in the rear end cavity of the motor enters the heat dissipation impeller assembly through the air inlet hole of the casing and is finally discharged out of the blower by the heat dissipation impeller assembly.

[0027] Due to the adoption of the above technical solution, the present invention uses cooling air with a small air volume and high pressure to cool the bearing assembly, and uses cooling air with a large air volume and low pressure to cool the motor components, thus solving the problem that the cooling of the bearing and the cooling of the motor cannot be taken into account at the same time. Moreover, the high-pressure air is drawn out through the volute, and there is no need to set up a high-pressure air source separately. The cooling work can be linked when the blower is started. The present invention has a simple structure, low cost, good cooling effect, and high efficiency, and can ensure the efficient and reliable operation of the air suspension blower. In addition, the high-pressure gas leaked in the impeller back cavity can enter the bearing seat cavity through the partition exhaust hole, and finally enter the motor front end cavity through the bearing seat exhaust hole, and be taken away by the heat dissipation impeller assembly, which can reduce the air pressure at the back of the impeller, thereby reducing the axial force of the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the internal structure of an embodiment of the present invention.

[0030] Figure 2 yes Figure 1 Enlarged view of point I.

[0031] Figure 3 yes Figure 1 Enlarged view of II.

[0032] Figure 4 It is a schematic diagram of the internal cooling air flow of an embodiment of the present invention.

[0033] Figure 5 yes Figure 4 Enlarged view of point I.

[0034] Figure 6 yes Figure 5 Enlarged view of II.

[0035] Reference numerals: stator assembly 100; volute 110; volute vent hole 111; partition plate 120; axial comb seal 121; radial comb seal 122; partition plate exhaust hole 123; thrust pad 130; first thrust magnetic bearing 140a; second thrust magnetic bearing 140b; bearing housing 150; bearing housing air inlet hole 151; bearing housing exhaust hole 152; first radial magnetic bearing 160a; second radial magnetic bearing 160b; housing 170; first housing air inlet hole 171a; second housing air inlet hole 171b; housing air inlet hole 172; housing air flow passage 173; housing vent hole 174; radial comb seal structure 176; motor stator 180; housing 190; housing cylinder 192; rotor assembly 200; main nut 210; impeller 220; axial comb seal 221; radial sealing boss 222; positioning groove 223; thrust disc 230; main tie rod 240; main shaft 250; positioning boss 251; seal sleeve 260; sealing boss 261; auxiliary tie rod 270; cooling impeller 280; auxiliary lock nut 290; impeller back cavity 310; bearing housing cavity 320; thrust bearing cavity 330; front motor cavity 340; inner motor cavity 350; rear motor cavity 360; seal sleeve cavity 370; housing cavity 380. Detailed embodiments

[0036] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention will be more thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0037] The terms used in the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The singular forms "a", "the" and "said" used in the present invention and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0038] It should be understood that although the terms "first", "second", "third", etc. may be used in the present invention to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0039] See Figures 1 to 6 As shown, an air suspension blower includes a stator assembly 100, a rotor assembly 200 and a volute 110. The stator assembly 100 includes a housing 170 and a motor stator 180. The first end of the housing 170 is connected to the volute 110.

[0040] The rotor assembly 200 includes a main shaft 250. At both ends of the main shaft 250, a first radial suspension bearing 160a and a second radial suspension bearing 160b are respectively arranged. The first end of the main shaft 250 is connected to an impeller 220. Preferably, the impeller 220 is fixed on the main shaft through a main tie rod 240 and a main nut 210 that cooperate with the first end of the main shaft 250. The inner hole of the main shaft 250 is threadedly connected to the main tie rod 240. The main tie rod 240 passes through the impeller 220 and is threadedly connected to the main lock nut 210 at the left end, and the impeller 220 and the thrust disk 230 are locked through a stretcher. A positioning boss 251 that cooperates with a positioning groove 223 on the back of the impeller 220 is arranged at the first end of the main shaft 250 to position the impeller 220. The second end of the main shaft 250 is connected to a heat dissipation impeller assembly. Preferably, the heat dissipation impeller assembly includes a heat dissipation impeller 280, a housing 190, a housing cylinder 192 and a sealing sleeve 260. The heat dissipation impeller 280 is connected to the second end of the main shaft 250. The inner hole at the second end of the main shaft 250 is threadedly connected to an auxiliary tie rod 270. The auxiliary tie rod 270 passes through the sealing sleeve 260 and the heat dissipation impeller 280 and is threadedly connected to an auxiliary lock nut 290 at the right end, and the heat dissipation impeller 280 and the sealing sleeve 260 are locked through a stretcher. The housing 190 is connected to the outer peripheral surface of the second end of the housing 170. The housing cylinder 192 is fixed through a housing support plate 191. The housing cylinder 192 covers the end of the second end of the main shaft 250, so that the air flow after flowing through the heat dissipation impeller 280 is discharged smoothly, with small tail-end loss and low noise. The sealing sleeve 260 is arranged between the heat dissipation impeller 280 and the second end of the main shaft 250. The sealing sleeve 260 is in sealing cooperation with the inner peripheral surface of the second end of the housing 170. A radial comb tooth sealing structure 176 is arranged on the inner peripheral surface of the second end of the housing 170. A sealing boss 261 that cooperates with the radial comb tooth sealing structure 176 is arranged on the outer circle of the sealing sleeve 260 to prevent the high-pressure gas introduced into the sealing sleeve cavity 370 from leaking into the housing cavity 380.

[0041] A partition plate 120 and a bearing housing 150 are arranged between the back surface of the impeller 220 and the motor stator 180, and a thrust floating bearing assembly is arranged between the partition plate 120 and the bearing housing 150. Preferably, the thrust floating bearing assembly includes a first thrust floating bearing 140a, a second thrust floating bearing 140b, a thrust disc 230, and a thrust pad 130. The first thrust floating bearing 140a and the second thrust floating bearing 140b are arranged at intervals between the partition plate 120 and the bearing housing 150. The thrust disc 230 is arranged on the inner circumference between the first thrust floating bearing 140a and the second thrust floating bearing 140b. The boss on the inner circumference of the impeller 220 presses against the thrust disc 230, so that the inner circumference of the thrust disc 230 is fixed on the step of the main shaft 250. The thrust pad 130 is arranged on the outer circumference between the first thrust floating bearing 140a and the second thrust floating bearing 140b. An impeller axial seal structure is arranged between the outer circumference of the back surface of the impeller 220 and the partition plate 120, and an impeller radial seal structure is arranged between the inner circumference of the back surface of the impeller 220 and the partition plate 120. The impeller axial seal structure and the impeller radial seal structure include a comb seal structure. Specifically, an axial comb seal 221 and a radial seal boss 222 are arranged on the back surface of the impeller. The partition plate 120 is provided with an axial comb seal 121 and a radial comb seal 122. The axial comb seal 221 and the axial comb seal 121 are in sealing cooperation to form the impeller axial seal structure, and the radial seal boss 222 and the radial comb seal 122 are in sealing cooperation to form the impeller radial seal structure, preventing the high-pressure gas in the impeller area from leaking into the impeller back cavity 310.

[0042] The area surrounded by the bearing housing 150, the front end of the motor stator 180, and the front end of the machine shell 170 forms the front end cavity 340 of the motor. The area surrounded by the motor stator 180 and the rear end of the machine shell 170 forms the rear end cavity 360 of the motor. The area between the bearing housing 150 and the partition plate 120 forms the bearing housing cavity 320. The area between the back surface of the impeller 220 and the partition plate 120 forms the impeller back cavity 310.

[0043] The side wall of the volute 110 is provided with at least one volute vent hole 111. On one side of the housing 170 close to the bearing housing 150, a first housing air intake hole 171a is provided. On one side of the housing 170 close to the second radial magnetic bearing 140b, a second housing air intake hole 171b is provided. The bearing housing 150 is provided with a bearing housing air intake hole 151 that communicates with the first housing air intake hole 171a and the thrust bearing cavity 330 that accommodates the thrust magnetic bearing assembly. The bearing housing 150 is further provided with a bearing housing exhaust hole 152 that communicates with the bearing housing cavity 320 and the front-end cavity 340 of the motor. The partition 120 is provided with a partition exhaust hole 123 that communicates with the back cavity 310 of the impeller and the bearing housing cavity 320. The housing 170 is further provided with a housing air intake hole 172 that communicates with the front-end cavity 340 of the motor. One end of the housing 170 close to the cooling impeller assembly is provided with a housing vent hole 174 that communicates with the cooling impeller assembly. The high-pressure gas coming out of the volute vent hole 111 passes through the cooler 400 and then flows into the first housing air intake hole 171a and the second housing air intake hole 171b. The number of each hole can be selected according to the specific actual situation.

[0044] Combined with Figures 4 to 6 the arrow direction, a cooling method for an air suspension blower. During operation,

[0045] The high-pressure gas coming out of the volute vent hole 111 passes through the cooler 400 and then flows into the first housing air intake hole 171a and the second housing air intake hole 171b. The high-pressure gas entering from the first housing air intake hole 171a enters the thrust bearing cavity 330 through the bearing housing air intake hole 151, cools the thrust magnetic bearing assembly, and then part of the high-pressure gas enters the back cavity 310 of the impeller through the gap of the thrust magnetic bearing assembly, and then enters the bearing housing cavity 320 through the partition exhaust hole 123, and finally enters the front-end cavity 340 of the motor through the bearing housing exhaust hole 152; and the other part of the high-pressure gas after cooling the thrust magnetic bearing assembly enters the inner cavity 350 of the motor through the gap between the bearing housing 150 and the main shaft 250 after cooling the first radial magnetic bearing 140a; the high-pressure gas entering from the second housing air intake hole 171b cools the second radial magnetic bearing 140b and enters the rear-end cavity 360 of the motor through the gap between the housing 170 and the rear end of the main shaft 250;

[0046] Part of the air inhaled through the housing air intake hole 172 cools the outer wall of the motor through the housing air flow channel 173 and enters the rear-end cavity 360 of the motor, and the other part of the air cools the inner wall of the motor stator 180 and the main shaft 250 through the inner cavity 350 of the motor and then enters the rear-end cavity 360 of the motor;

[0047] The air in the front-end cavity 340 of the motor, the inner cavity 350 of the motor, and the rear-end cavity 360 of the motor is in communication;

[0048] The cooling air from the rear end cavity 360 of the motor enters the heat dissipation impeller assembly through the casing vent 174 and is finally discharged out of the blower by the heat dissipation impeller assembly. Specifically, the cooling air from the rear end cavity 360 of the motor enters the cover cavity 380 through the casing vent 174 and is finally discharged out of the blower by the heat dissipation impeller 280.

[0049] The present invention utilizes cooling air with a small air volume and high pressure to cool the bearing assembly, and utilizes cooling air with a large air volume and low pressure to cool the motor components, thereby solving the problem that the cooling of the bearing and the cooling of the motor cannot be taken into account at the same time. Moreover, the high-pressure air is led out through the volute, and there is no need to set up a high-pressure air source separately. The cooling work can be linked when the blower is started. The present invention has a simple structure, low cost, good cooling effect, and high efficiency, and can ensure the efficient and reliable operation of the air suspension blower.

[0050] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0051] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0052] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations), and corresponding interpretations of the spatial relative descriptions used herein will be made.

[0053] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. An air suspension blower, comprising a stator assembly, a rotor assembly and a volute, wherein the stator assembly comprises a casing and a motor stator, the rotor assembly comprises a main shaft, and the two ends of the main shaft are respectively provided with a first radial suspension bearing and a second radial suspension bearing, the first end of the main shaft is connected to the impeller, the second end of the main shaft is connected to the heat dissipation impeller assembly, the first end of the casing is connected to the volute, a partition and a bearing seat are provided between the back of the impeller and the motor stator, and a thrust suspension bearing assembly is provided between the partition and the bearing seat, characterized in that: The area enclosed by the bearing seat, the motor stator, and the front end of the casing forms a motor front end cavity, the area enclosed by the motor stator and the rear end of the casing forms a motor rear end cavity, a bearing seat cavity is formed between the bearing seat and the partition, and an impeller back cavity is formed between the back of the impeller and the partition, and the side wall of the volute is provided with at least one volute air vent, a first casing air duct is provided on the side of the casing close to the bearing seat, and a second casing air duct is provided on the side of the casing close to the second radial suspension bearing, and the bearing seat is provided with a first casing air duct, a vent for accommodating the impeller, and a vent for accommodating the impeller. The thrust bearing assembly comprises a bearing seat air inlet hole connected to the thrust bearing cavity of the force suspension bearing assembly, the bearing seat is also provided with a bearing seat exhaust hole connected to the bearing seat cavity and the front end cavity of the motor, the partition is provided with a partition exhaust hole connected to the impeller back cavity and the bearing seat cavity, the casing is also provided with a casing air inlet hole connected to the front end cavity of the motor, the casing is close to the heat dissipation impeller assembly at one end thereof and is provided with a casing air vent connected to the heat dissipation impeller assembly, and the high-pressure gas coming out of the volute air vent passes through the cooler and flows into the first casing air inlet hole and the second casing air inlet hole.

2. The air suspension blower according to claim 1, characterized in that: The heat dissipation impeller assembly comprises: a heat dissipation impeller connected to the second end of the main shaft; A cover shell connected to the outer peripheral surface of the second end of the casing, and a cover shell cylinder covering the second end of the main shaft is provided on the cover shell; A sealing sleeve is arranged between the heat dissipation impeller and the second end of the main shaft, and the sealing sleeve is sealed with the inner circumferential surface of the second end of the casing.

3. The air suspension blower according to claim 2, characterized in that: The heat dissipation impeller is fixed on the main shaft through a secondary pull rod and a secondary nut matched with the second end of the main shaft.

4. The air suspension blower according to claim 2, characterized in that: The inner circumference of the second end of the housing is provided with a radial comb-teeth sealing structure, and the outer circumference of the sealing sleeve is provided with a sealing boss matched with the radial comb-teeth sealing structure.

5. The air suspension blower according to claim 1, characterized in that: An impeller axial sealing structure is arranged between the outer periphery of the back side of the impeller and the partition plate, and an impeller radial sealing structure is arranged between the inner periphery of the back side of the impeller and the partition plate.

6. The air suspension blower according to claim 5, characterized in that: The impeller axial sealing structure and the impeller radial sealing structure include comb teeth sealing structures.

7. The air suspension blower according to claim 1, characterized in that: The thrust suspension bearing assembly comprises: A first thrust suspension bearing and a second thrust suspension bearing are arranged between the partition plate and the bearing seat at intervals; A thrust plate is arranged on the inner periphery between the first thrust suspension bearing and the second thrust suspension bearing, and a boss on the inner periphery of the impeller presses the thrust plate so that the inner periphery of the thrust plate is fixed on the step of the main shaft; A thrust pad is arranged on the outer periphery between the first thrust suspension bearing and the second thrust suspension bearing.

8. The air suspension blower according to claim 1, characterized in that: The first end of the main shaft is provided with a positioning boss which matches with the positioning groove on the back side of the impeller.

9. The air suspension blower according to claim 1, characterized in that: The impeller is fixed on the main shaft through a main tie rod and a main nut matched with the first end of the main shaft.

10. A cooling method for an air suspension blower according to any one of claims 1 to 9, characterized in that: When working, The high-pressure gas coming out of the volute air vent passes through the cooler and flows into the first casing air inlet hole and the second casing air inlet hole. The high-pressure gas entering from the first casing air inlet hole enters the thrust bearing cavity after passing through the bearing seat air inlet hole to cool the thrust suspension bearing assembly. Then part of the high-pressure gas enters the impeller back cavity through the gap of the thrust suspension bearing assembly, and then enters the bearing seat cavity through the partition exhaust hole, and finally enters the motor front end cavity through the bearing seat exhaust hole; and another part of the high-pressure gas after cooling the thrust suspension bearing assembly cools the first radial suspension bearing through the gap between the bearing seat and the main shaft, and then enters the motor inner cavity; the high-pressure gas entering from the second casing air inlet hole cools the second radial suspension bearing, and enters the motor rear end cavity through the gap between the casing and the rear end of the main shaft; Part of the air sucked in by the air inlet of the casing cools the outer wall of the motor through the air duct of the casing and enters the rear end cavity of the motor, and the other part of the air cools the inner wall of the motor stator and the main shaft through the inner cavity of the motor and then enters the rear end cavity of the motor; The air in the front end cavity of the motor, the inner cavity of the motor, and the rear end cavity of the motor are connected; The cooling air from the rear end cavity of the motor enters the heat dissipation impeller assembly through the air vents of the casing, and is finally discharged out of the blower by the heat dissipation impeller assembly.

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