CN115370593A

CN115370593A - Air suspension centrifugal blower for fuel cell

Info

Publication number: CN115370593A
Application number: CN202211210373.2A
Authority: CN
Inventors: 王聪聪; 孟庆梅; 陆荣光; 朱礼丽; 韩丽姝; 张为海; 王雪华
Original assignee: Fuyuan Air Suspension System Weifang Co ltd
Current assignee: Fuyuan Air Suspension System Weifang Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2022-11-22

Abstract

The invention discloses an air suspension centrifugal blower for a fuel cell, which comprises a motor and an air compressor. The motor comprises a motor base with two open ends, a motor spindle is arranged in the motor base, and a stator surrounding the motor spindle is further arranged in the motor base. The two gas compressors are arranged and both comprise gas compressor shells; the two compressor casings are respectively arranged at two ends of the motor base; two impellers are respectively arranged at two ends of the motor main shaft and are respectively positioned in the two compressor casings; the two compressor cases are communicated through a connecting pipe. The air suspension blower for the fuel cell system can compress air in two stages and provide compressed air with higher pressure so as to meet the requirement that the fuel cell system performs hydrogen-oxygen reaction to generate electricity.

Description

Air suspension centrifugal blower for fuel cell

Technical Field

The invention relates to the technical field of air suspension blowers, in particular to an air suspension blower for a fuel cell.

Background

The hydrogen fuel cell directly outputs electric energy through chemical reaction of hydrogen and oxygen, the power of the hydrogen fuel cell is directly related to the air supply density pressure and the air supply flow of the air supply system, the higher the air supply pressure is, the higher the oxygen content is, the faster the reaction speed of the fuel cell is, and the higher the energy conversion rate is.

In the prior art, a single-stage compressor, a double-pressure parallel air suspension centrifugal blower and the like are generally adopted, and the structure adopts a compressor shell to suck air at an air inlet pressure end and directly discharge the air from an air outlet to provide compressed air. The pressure of compressed air generated by a single-stage compressor and a double-pressure parallel air suspension centrifugal blower is low, and the use of a fuel cell system is difficult to ensure.

In addition, the pressure of the air suspension centrifugal blower is high, the rotor and the surrounding air are subjected to severe friction and air high-pressure compression to generate a large amount of heat energy, so that the temperature of the rotor and the bearing is increased and deformed, the heat energy is also transferred to the motor base and the motor, and the high-temperature failure of the bearing is possibly caused; under the high-voltage and high-speed action, the temperature of the motor stator can also rise rapidly, if the motor stator cannot be cooled in time, the service life of the insulating material is influenced by excessive heat, the output power of the motor is reduced, and even the motor is burnt.

Disclosure of Invention

In order to overcome the defects, the technical problem to be solved by the invention is to provide an air suspension blower for a fuel cell, which can provide compressed air with higher pressure to meet the requirement of hydrogen-oxygen reaction of a fuel cell system to generate electricity.

In order to solve the technical problem, the air suspension centrifugal blower for the fuel cell comprises a motor and an air compressor; the motor comprises a motor base with two open ends, a motor spindle is arranged in the motor base, and a stator surrounding the motor spindle is further arranged in the motor base; the two gas compressors are arranged and comprise gas compressor shells; the two compressor housings are respectively arranged at two ends of the motor base; two impellers are respectively arranged at two ends of the motor main shaft and are respectively positioned in the two compressor casings; the two compressor casings are communicated through a connecting pipe.

Furthermore, the motor spindle comprises a rotor shaft, two ends of the rotor shaft are respectively and fixedly connected with two connecting shafts, the two connecting shafts are respectively a left connecting shaft and a right connecting shaft, the left connecting shaft is connected to the left end of the rotor shaft, and the right connecting shaft is fixedly connected to the right end of the rotor shaft; the two impellers are respectively a left impeller and a right impeller, the left impeller is fixedly connected to the left connecting shaft, and the right impeller is fixedly connected to the right connecting shaft; and the right end of the rotor shaft is provided with a thrust piece.

Furthermore, two ends of the motor base are respectively and fixedly connected with a left connecting plate and a right connecting plate; the two compressor casings are respectively a left compressor casing and a right compressor casing, the left compressor casing is fixedly connected with the left connecting plate, and the right compressor casing is fixedly connected with the right connecting plate.

Further, the motor spindle is rotatably mounted on the left spindle bearing seat and the right spindle bearing seat; and a thrust bearing seat is further arranged in the motor base, and the right spindle bearing seat and the thrust bearing seat are fixedly connected to the right connecting plate.

Further, a sealing plate is fixedly connected to the thrust bearing seat, and the sealing plate is arranged between the right impeller and the thrust bearing seat; the sealing plate is provided with inner saw-shaped teeth and side saw-shaped teeth; and right impeller sawtooth matched with the side sawtooth are arranged on the right impeller.

Further, the air suspension centrifugal blower for the fuel cell further comprises an air cooling structure; the air cooling structure comprises a branch pipe, one end of the branch pipe is communicated with the connecting pipe, and the other end of the branch pipe is communicated with the inside of the motor base; a cooling air sleeve is arranged in the motor base, a blind groove and a through groove are axially arranged on the outer peripheral surface of the cooling air sleeve, annular grooves are radially arranged at two ends of the cooling air sleeve, and the two annular grooves are a left-end annular groove and a right-end annular groove respectively; the motor base is also provided with a motor base air outlet, and the motor base air outlet is communicated with a gap at the left end inside the motor base.

Further, a motor base air passing hole is formed in the motor base, the motor base air passing hole is communicated with the right end ring groove, a right main shaft bearing seat air passing hole B is formed in the right main shaft bearing seat, the right main shaft bearing seat air passing hole is communicated with the motor base air passing hole, a thrust bearing seat vent groove is formed in the thrust bearing seat, the thrust bearing seat vent groove is communicated with the right main shaft bearing seat air passing hole B, the thrust bearing seat vent groove extends to an inner cavity of the thrust bearing seat, communicated first gaps are formed among the thrust bearing and the thrust bearing seat and the right main shaft bearing seat, a right main shaft bearing seat air passing hole B branch hole is formed in the right main shaft bearing seat air passing hole B, and the right main shaft bearing seat air passing hole B branch hole is communicated with the first gap; the right spindle bearing seat is provided with a right spindle bearing, a second gap is formed between the right spindle bearing and the spindle, the first gap is communicated with the second gap, and the second gap is communicated with the gap at the left end of the motor base.

Further, still be provided with the motor cabinet through-hole on the motor cabinet, still be provided with right main shaft bearing frame on the right main shaft bearing frame and cross gas pocket A, still be provided with the closing plate on the closing plate and cross the gas pocket, the closing plate crosses the gas pocket and passes through the thrust bearing frame crosses the gas pocket and right main shaft bearing frame crosses gas pocket A and is linked together with the motor cabinet through-hole.

Furthermore, a cooling water jacket is further arranged inside the motor base, the cooling water jacket is arranged between the stator and the cooling air jacket, the stator is attached to the inner wall of the cooling water jacket, the cooling air jacket is attached to the outer wall of the cooling water jacket, a cooling water channel is arranged on the outer wall of the cooling water jacket, and a water inlet and a water outlet which are communicated with the cooling water channel are formed in the motor base.

Furthermore, a flow meter is arranged at the air inlet of the right compressor shell.

After the technical scheme is adopted, the air suspension centrifugal blower for the fuel cell has the beneficial effect that the air suspension centrifugal blower for the fuel cell comprises the motor and the air compressor. The motor comprises a motor base with two open ends, a motor spindle is arranged in the motor base, and a stator surrounding the motor spindle is further arranged in the motor base. The two gas compressors are arranged and both comprise gas compressor shells; the two compressor casings are respectively arranged at two ends of the motor base; two impellers are respectively arranged at two ends of the motor main shaft and are respectively positioned in the two compressor shells; the two compressor casings are communicated through a connecting pipe. The air suspension blower for the fuel cell system can compress air in two stages and provide compressed air with higher pressure so as to meet the requirement that the fuel cell system performs hydrogen-oxygen reaction to generate electricity.

Drawings

Fig. 1 is a perspective view of an air levitation centrifugal blower for a fuel cell of the present invention;

FIG. 2 is an enlarged perspective view of the motor mount of FIG. 1;

fig. 3 is an enlarged perspective view of the cooling water jacket of fig. 1;

FIG. 4 is an enlarged perspective view of the cooling windband of FIG. 1;

FIG. 5 is an enlarged perspective view of the seal plate of FIG. 1;

FIG. 6 is an enlarged perspective view of the thrust bearing block of FIG. 1;

FIG. 7 is a first cross-sectional view of FIG. 1;

FIG. 8 is an enlarged view of area A of FIG. 7;

FIG. 9 is a second cross-sectional view of FIG. 1;

FIG. 10 is an enlarged view of area B of FIG. 9;

FIG. 11 is a third cross-sectional view of FIG. 1;

FIG. 12 is an enlarged view of area C of FIG. 11;

FIG. 13 is a fourth cross-sectional view of FIG. 1;

FIG. 14 is an enlarged view of area D of FIG. 13;

in the drawings, the direction of the arrow indicates the flow direction of the gas;

in the figure: 1. a flow meter; 2. a right impeller; 21. a right impeller saw tooth; 3. a left impeller; 4. a motor base; 41. an air outlet of the motor base; 42. a motor base air hole is formed; 43. a motor base through hole; 44. a void; 51. a rotor shaft; 52. a right connecting shaft; 53. a left connecting shaft; 6. cooling the air jacket; 61. a blind groove; 62. a through groove; 63. a left end ring groove; 64. a right annular groove; 7. a cooling water jacket; 71. a cooling water channel; 8. a sealing plate; 81. inner saw-shaped teeth; 82. side saw teeth; 83. sealing plate air holes; 9. a right main shaft bearing seat; 91. a right main shaft bearing seat air passing hole A; 92. a bearing seat of the right main shaft is provided with an air hole B; 921. a branch hole B of a gas passing hole of the right main shaft bearing seat; 10. a right compressor casing; 11. a left compressor casing; 12. a thrust bearing seat; 121. a thrust bearing seat vent groove; 122. a thrust bearing seat air passing hole; 13. a bearing and pushing sheet; 14. a left main shaft bearing seat; 15. a left connecting plate; 16. a stator; 17. a connecting pipe; 18. a branch pipe; 19. a right connecting plate; 200. a first gap; 300. a second gap; 400. a third gap.

Detailed Description

The invention is further described with reference to the following figures and examples.

As shown in fig. 1, 7, 9, 11, and 13, an air levitation centrifugal blower for a fuel cell includes a motor and a compressor. The motor comprises a motor base 4 with two open ends, a motor spindle is arranged in the motor base 4, and a stator 16 surrounding the motor spindle is also arranged in the motor base 4; the motor spindle comprises a rotor shaft 51, two connecting shafts are fixedly connected to two ends of the rotor shaft 51, and the two connecting shafts are a left connecting shaft 53 and a right connecting shaft 52 respectively; both ends of the rotor shaft 51 are provided with threaded holes, and the right end of the left connecting shaft 53 and the left end of the right connecting shaft 52 are screwed to the threaded holes at both ends of the rotor shaft 51 respectively through external threads arranged on the outer walls of the threaded holes.

The two compressors are respectively a left compressor and a right compressor. Both compressors include a compressor housing; the two compressor casings are respectively arranged at two ends of the motor base 4; two impellers are respectively arranged at two ends of the motor main shaft and are respectively positioned in the two compressor shells; the two compressor cases are respectively a left compressor case 11 and a right compressor case 10, a left connecting plate 15 is fixedly connected to the left end of the motor base 4, the left compressor case 11 is fixedly connected to the left connecting plate 15, a right connecting plate 19 is fixedly connected to the right end of the motor base 4, and the right compressor case 10 is fixedly connected to the right connecting plate 19; the two impellers are respectively a left impeller 3 and a right impeller 2, the left impeller 3 is arranged in the left compressor shell 11, and the right impeller 2 is arranged in the right compressor shell 10. The left impeller 3 is fixedly connected to the left connecting shaft 53, and the right impeller 2 is fixedly connected to the right connecting shaft 52.

An air inlet and an air outlet are arranged on the left compressor shell 11 and the right compressor shell 10, and a flowmeter 1 is arranged at the air inlet of the right compressor shell 10. The left compressor casing 11 and the right compressor casing 10 are communicated through a connecting pipe 17, that is, an air outlet of the right compressor casing 10 is communicated with an air inlet of the left compressor casing 11, and air after two-stage compression is discharged through an air outlet of the left compressor casing 11.

As shown in fig. 1 and 2, the motor base 4 is provided with a motor base air outlet 41, a motor base air passing hole 42, and a motor base through hole 43.

As shown in fig. 1 and 3, a cooling air jacket 6 is provided in the motor base 4, an outer peripheral surface of the cooling air jacket 6 is attached to an inner wall surface of the motor base 4, and preferably, the motor base 4 and the cooling air jacket 6 are in interference fit. The outer peripheral face of the cooling air jacket 6 is axially provided with a blind groove 61 and a plurality of through grooves 62, the through grooves 62 are arranged at intervals, annular grooves are radially arranged at two ends of the cooling air jacket 6, and the two annular grooves are a left end annular groove 63 and a right end annular groove 64 respectively.

As shown in fig. 1 and 4, a cooling water jacket 7 is further disposed inside the motor base 4, the cooling water jacket 7 is disposed between the stator 16 and the cooling air jacket 6, the stator 16 is attached to an inner wall of the cooling water jacket 7, the stator 16 is preferably fixedly connected to the inner wall of the cooling water jacket 7, the cooling air jacket 6 is attached to an outer wall of the cooling water jacket 7, a cooling water channel 71 is disposed on the outer wall of the cooling water jacket 7, and a water inlet and a water outlet communicated with the cooling water channel 71 are disposed on the motor base 4.

As shown together with fig. 1, 7, 9, 11, and 13, a rotor shaft 51 of the motor spindle is rotatably mounted on the left spindle bearing housing 14 and the right spindle bearing housing 9; a thrust bearing seat 12 is also arranged in the motor seat 4. The right main shaft bearing seat 9 and the thrust bearing seat 12 are fixedly arranged on a right connecting plate 19; the left main shaft bearing seat 14 and the left connecting plate 15 are fixedly mounted on the motor base 4 through bolts, and the outer walls of the left main shaft bearing seat 14 and the right main shaft bearing seat 9 are in positioning fit with the inner walls of the two ends of the motor base 4.

The right end of the rotor shaft 51 is connected with a right main shaft bearing seat 9 through a right main shaft bearing, and the right main shaft bearing is a radial bearing (clockwise); the left end of the rotor shaft 51 is connected with the left main shaft bearing seat 14 through a left main shaft bearing, and the left main shaft bearing is a radial bearing (anticlockwise); the stator 16 is fixedly arranged on the inner wall of the cooling water jacket 7, and the rotor shaft 51 is inserted into the inner cavity of the stator 16 to rotate freely.

As shown in fig. 1, 5, 6, and 7, the thrust bearing seat 12 is further fixedly connected with a sealing plate 8, and the sealing plate 8 is disposed between the right impeller 2 and the thrust bearing seat 12; an inner saw-shaped tooth 81 is arranged in the inner cavity of the sealing plate 8, and a side saw-shaped tooth 82 is arranged on the side part of the sealing plate 8; the right impeller 2 is provided with right impeller serrations 21 which are adapted to the side serrations 82. Here, the sealing is performed by using the side serrations 82 and the right impeller serrations 21, so that the loss of the flow rate can be reduced, and the air compressed by the right compressor can be discharged from the air outlet of the right compressor case 10 as much as possible, and can enter the inside of the left compressor case 11 through the connection pipe 17 to be further compressed.

As shown in fig. 7, 8, 9, 10, 11, and 12, the air-suspending centrifugal blower for a fuel cell further includes an air-cooling structure; the air cooling structure comprises a branch pipe 18, one end of the branch pipe 18 is communicated with the connecting pipe 17, and the other end of the branch pipe 18 is communicated with the inside of the motor base 4; the motor base air outlet 41 is communicated with a gap 44 at the left end inside the motor base 4.

The motor base air passing hole 42 is communicated with the right end ring groove 64, a plurality of right main shaft bearing base air passing holes B92 are annularly arranged on the right main shaft bearing base 9, the right main shaft bearing base air passing holes B92 are communicated with the motor base air passing holes 42, a plurality of motor base air passing holes 42 are also annularly arranged, the right main shaft bearing base air passing holes B92 are communicated with the corresponding motor base air passing holes 42, a plurality of thrust bearing base vent grooves 121 are annularly arranged on the thrust bearing base 12, the thrust bearing base vent grooves 121 are communicated with the right main shaft bearing base air passing holes B92, the thrust bearing base vent grooves 121 extend to the inner cavity of the thrust bearing base 12, communicated first gaps 200 are respectively arranged between the thrust bearing sheet 13 and the thrust bearing base 12 as well as between the thrust bearing base 12 and the right main shaft bearing base 9, the right main shaft bearing base air passing holes B92 are provided with right main shaft bearing base air passing hole B branch holes 921, and the right main shaft bearing base air passing hole B branch holes 921 are communicated with the first gaps 200; the right main shaft bearing seat 9 is provided with a right main shaft bearing, a second gap 300 is arranged between the right main shaft bearing and the main shaft, and the first gap 200 is communicated with the second gap 300. A third gap 400 is provided between the stator 16 and the rotor shaft 51, the second gap 300 communicates with the third gap 400, the third gap 400 also communicates with the gap 44 at the left end inside the motor base 4, and the gap 44 communicates with the motor base air outlet 41.

As shown together with fig. 13 and 14, the motor base 4 is further provided with a motor base through hole, the right spindle bearing seat 9 is further provided with a right spindle bearing seat air passing hole a 91, the sealing plate 8 is further provided with a sealing plate air passing hole 83, the thrust bearing seat 12 is further provided with a thrust bearing seat air passing hole 122, the sealing plate air passing hole 83 is communicated with the thrust bearing seat air passing hole 122, the thrust bearing seat air passing hole 122 is communicated with the corresponding right spindle bearing seat air passing hole a 91, and the right spindle bearing seat air passing hole a 91 is communicated with the motor base through hole 43. Thrust bearings (not shown in the figure) are arranged on two sides of the thrust bearing piece, the two thrust bearings are respectively arranged on the thrust bearing seat and the right main shaft bearing seat, and the installation mode of the thrust bearings belongs to the common knowledge for the technical personnel in the field and is not described again. The structure reduces the pressure difference between the back of the right impeller 2 and the air inlet of the right compressor shell 10, reduces the trend that the right impeller 2 moves along the right connecting shaft 52, avoids the unbalanced stress of the thrust bearing, and ensures the reliability of the thrust bearing.

The following describes the operation of the air suspension centrifugal blower for a fuel cell according to the present invention in detail:

after the equipment is started, the rotor shaft 51 drives the left connecting shaft 53 and the right connecting shaft 52 to rotate, and the left impeller 3 and the right impeller 2 rotate; the outside gas gets into from the air inlet of right compressor case 10, compress through right impeller 2, the gas through the compression gets into the connecting pipe 17 of the gas outlet intercommunication of right compressor case 10, there is a small amount of gas to carry out the forced air cooling through the inside that branch pipe 18 on the connecting pipe 17 got into motor cabinet 4, the gas in the connecting pipe 17 enters into the inside back that carries out the second grade compression of left compressor case 11 from the air inlet of left compressor case 11, and the air work pipeline of discharging into through the gas outlet of left compressor case 11.

A small amount of gas in the right compressor shell 10 enters between the back of the right impeller 2 and the sealing plate 8, and the back of the right impeller 2 and the sealing plate 8 are sealed by a saw-tooth structure, so that the back pressure of the right impeller 2 can be balanced, and the flow loss can be reduced. The sealing plate air passing hole 83 is communicated with the thrust bearing seat air passing hole 122, the thrust bearing seat air passing hole 122 is communicated with the corresponding right main shaft bearing seat air passing hole A91, and the right main shaft bearing seat air passing hole A91 is communicated with the motor seat through hole 43. The structure reduces the pressure difference between the back of the right impeller 2 and the air inlet of the right compressor shell 10, reduces the trend that the right impeller 2 moves along the right connecting shaft 52, avoids the unbalanced stress of the thrust bearing, and ensures the reliability of the thrust bearing.

After the gas is compressed by the right compressor, a small part of the gas enters the inner space of the motor base 4 through the branch pipe 18, enters the blind groove 61 of the cooling air jacket 6, enters the left end annular groove 63 through the blind groove 61, and enters the right end annular groove 64 through the through grooves 62, and in the process, the gas cools the cooling air jacket 6. The air flowing through the right-end annular groove 64 reaches a cavity between the right spindle bearing seat 9 and the inner wall of the motor base 4 through the motor base air passing hole 42, the right end of the right spindle bearing seat air passing hole B92 is sealed by the thrust bearing seat 12, cooling air flows into the first gap 200 through the right spindle bearing seat air passing hole B branch hole 921 and then flows into the thrust bearing seat vent groove 121 of the thrust bearing seat 12, the thrust bearing seat vent groove 121 is communicated with the inner cavity of the thrust bearing seat, flows to the thrust bearing inner cavity to provide pressure air for the thrust bearing inner cavity and dissipate heat, and flows into the cavity inside the motor base 4 and flows into the gap 44 at the left end inside the motor base 4 from the right spindle bearing air passing hole B92 and the fit gap between the radial bearing (clockwise) and the rotor shaft 51 after cooling the stator 16 and the radial bearing (clockwise), and is finally discharged from the motor base air outlet 41 without arranging a heat dissipation impeller. Therefore, the power consumption generated by the heat dissipation impeller is reduced, the heat dissipation effect is improved, the temperature rise of the rotor and the stator 16 of the motor is further reduced, and the service life of the motor is prolonged.

Meanwhile, cooling liquid enters from a water inlet on the motor base 4 and circulates around the cooling water jacket 7 and then is discharged from a water outlet of the motor base 4 to cool the stator 16.

The bearings used in the invention are all air suspension bearings.

The technical features (such as the first gap, the second gap, and the third gap) with reference numbers are referred to in the present specification only for distinguishing the technical features, and do not represent the positional relationship, the installation order, the operation order, and the like between the technical features.

In the description of the present specification, it is to be understood that the orientations or positional relationships described in the terms "right impeller", "right impeller serration", "left impeller", "right connecting shaft", "left end ring groove", "right end ring groove", "inner serration", "side serration", "right spindle bearing seat air hole", "right compressor housing", "left spindle bearing seat", "right connecting plate", "left connecting plate", "inside", and the like are based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

The present invention is not limited to the above-described embodiments, and various modifications made by those skilled in the art without inventive skill from the above-described conception fall within the scope of the present invention.

Claims

1. An air suspension centrifugal blower for a fuel cell comprises a motor and a gas compressor; the motor comprises a motor base with two open ends, a motor spindle is arranged in the motor base, and a stator surrounding the motor spindle is further arranged in the motor base; the compressor is characterized in that two compressors are arranged, and each compressor comprises a compressor shell; the two compressor housings are respectively arranged at two ends of the motor base; two impellers are respectively arranged at two ends of the motor main shaft and are respectively positioned in the two compressor casings; the two compressor casings are communicated through a connecting pipe.

2. The air-suspending centrifugal blower for a fuel cell according to claim 1, wherein the motor main shaft includes a rotor shaft, two connecting shafts are fixedly connected to both ends of the rotor shaft, respectively, the two connecting shafts are a left connecting shaft and a right connecting shaft, respectively, the left connecting shaft is connected to a left end of the rotor shaft, and the right connecting shaft is fixedly connected to a right end of the rotor shaft; the two impellers are respectively a left impeller and a right impeller, the left impeller is fixedly connected to the left connecting shaft, and the right impeller is fixedly connected to the right connecting shaft; and the right end of the rotor shaft is provided with a thrust piece.

3. The air-suspending centrifugal blower for fuel cells according to claim 2, wherein a left connection plate and a right connection plate are fixedly connected to both ends of the motor base, respectively; the two compressor casings are respectively a left compressor casing and a right compressor casing, the left compressor casing is fixedly connected with the left connecting plate, and the right compressor casing is fixedly connected with the right connecting plate.

4. The air-suspending centrifugal blower for a fuel cell as set forth in claim 3, wherein the motor spindle is rotatably mounted to a left spindle bearing housing and a right spindle bearing housing; and a thrust bearing seat is further arranged in the motor base, and the right spindle bearing seat and the thrust bearing seat are fixedly connected to the right connecting plate.

5. The air-suspending centrifugal blower for a fuel cell according to claim 4, wherein a sealing plate is fixedly connected to the thrust bearing housing, the sealing plate being disposed between the right impeller and the thrust bearing housing; the sealing plate is provided with inner saw-shaped teeth and side saw-shaped teeth; and right impeller sawtooth matched with the side sawtooth are arranged on the right impeller.

6. The air-suspending centrifugal blower for a fuel cell according to claim 5, further comprising an air-cooling structure; the air cooling structure comprises a branch pipe, one end of the branch pipe is communicated with the connecting pipe, and the other end of the branch pipe is communicated with the inside of the motor base; a cooling air sleeve is arranged in the motor base, a blind groove and a through groove are axially arranged on the outer peripheral surface of the cooling air sleeve, annular grooves are radially arranged at two ends of the cooling air sleeve, and the two annular grooves are a left-end annular groove and a right-end annular groove respectively; the motor base is also provided with a motor base air outlet, and the motor base air outlet is communicated with a gap at the left end inside the motor base.

7. The air-suspending centrifugal blower for fuel cell as claimed in claim 6, wherein the motor base is provided with a motor base air passing hole, the motor base air passing hole is communicated with the right end ring groove, the right spindle bearing seat is provided with a right spindle bearing seat air passing hole B, the right spindle bearing seat air passing hole is communicated with the motor base air passing hole, the thrust bearing seat is provided with a thrust bearing seat vent groove, the thrust bearing seat vent groove is communicated with the right spindle bearing seat air passing hole B, the thrust bearing seat vent groove extends to an inner cavity of the thrust bearing seat, the thrust plate, the thrust bearing and the right spindle bearing seat are provided with a first gap communicated with each other, the right spindle bearing seat air passing hole B is provided with a right spindle bearing seat air passing hole B branch hole, and the right spindle bearing seat air passing hole B branch hole is communicated with the first gap; the right spindle bearing seat is provided with a right spindle bearing, a second gap is formed between the right spindle bearing and the spindle, the first gap is communicated with the second gap, and the second gap is communicated with the gap at the left end of the motor base.

8. The air-suspending centrifugal blower for fuel cell as claimed in claim 5, wherein the motor base is further provided with a motor base through hole, the right spindle bearing seat is further provided with a right spindle bearing seat air passing hole A, the sealing plate is further provided with a sealing plate air passing hole, and the sealing plate air passing hole is communicated with the motor base through hole through the thrust bearing seat air passing hole and the right spindle bearing seat air passing hole A.

9. The air suspension centrifugal blower for fuel cells as claimed in claim 1, wherein a cooling jacket is further disposed inside the motor base, the cooling jacket is disposed between the stator and the cooling jacket, the stator is attached to an inner wall of the cooling jacket, the cooling jacket is attached to an outer wall of the cooling jacket, a cooling water channel is disposed on the outer wall of the cooling jacket, and a water inlet and a water outlet communicated with the cooling water channel are disposed on the motor base.

10. The air-suspending centrifugal blower for a fuel cell as set forth in claim 3, wherein a flow meter is provided at an air inlet of the right compressor case.