A centrifugal compressor for hydrogen fuel cell

Abstract

The invention discloses a centrifugal compressor for hydrogen fuel cells, including a housing assembly, a motor stator, a thrust plate, a thrust bearing, a radial bearing, a first sleeve, a tie rod, a second sleeve, an impeller, a nut and a motor rotor; the motor stator is arranged inside the housing assembly, and the motor rotor is inserted in the inner cavity of the motor stator; tie rods are respectively sleeved at both ends of the motor rotor, and a nut, a thrust plate and a first sleeve are sleeved coaxially from left to right on a left tie rod, and the thrust plate is axially locked and fixed by the nut; a nut, an impeller and a second sleeve are sleeved coaxially from right to left on a right tie rod, and the impeller is axially locked and fixed by the nut; thrust bearings are symmetrically arranged on both sides of the thrust plate, and radial bearings are sleeved on the first sleeve and the second sleeve. The structural design of the invention is scientific and reasonable, and the size and weight of the whole machine are reduced through the integrated housing design.

Description

Technical Field

[0001] The present invention relates to the field of hydrogen fuel cells, and in particular to a centrifugal compressor for hydrogen fuel cells. Background Art

[0002] The air compressor is an important component of the fuel cell, providing the fuel cell stack with the oxygen required for the reaction.

[0003] At present, the centrifugal compressor rotor assembly used in hydrogen fuel cells generally integrates the motor rotor and the main shaft. The main shaft end is fixedly connected to the centrifugal impeller, and the impeller is built into the volute. When the motor rotor rotates at high speed, the impeller drives the gas to rotate at high speed, and interacts with the volute to generate high-pressure air. The bearing provides support for the main shaft-impeller integrated rotating component. A labyrinth seal is used between the rotor and the stator to prevent gas leakage.

[0004] In order to increase the pressure and flow rate of the output air, centrifugal compressors often have very high rotation speeds, but existing traditional rolling or sliding oil-lubricated bearings are difficult to meet these requirements and cannot meet the oil-free working environment requirements of fuel cell engines. They will also cause problems with rotor heating or rotor dynamics stability, which puts higher requirements on the heat dissipation of bearings and motors, and need to be comprehensively considered and solved in the specific design of centrifugal compressors. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a centrifugal compressor for hydrogen fuel cells, which has a scientific and reasonable structural design and reduces the size and weight of the whole machine through the integrated shell design.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A centrifugal compressor for a hydrogen fuel cell of the present invention has the following innovations: It includes a housing assembly, a motor stator, a thrust plate, a thrust bearing, a radial bearing, a first sleeve, a pull rod, a second sleeve, an impeller, a nut and a motor rotor; a motor stator is also horizontally fixed inside the housing assembly, and a motor rotor is inserted in the inner cavity of the motor stator, and the two ends of the motor rotor respectively extend vertically out of the motor stator, and the two are freely rotatably connected; pull rods are also coaxially sleeved on the left and right end faces of the motor rotor. , and on the left pull rod, a nut, a thrust plate and a first sleeve are coaxially sleeved in sequence from left to right, the thrust plate, the first sleeve and the motor rotor are clamped together in sequence, and the thrust plate is axially locked and fixed by the nut; on the right pull rod, a nut, an impeller and a second sleeve are coaxially sleeved in sequence from right to left, the impeller, the second sleeve and the motor rotor are clamped together in sequence, and the impeller is axially locked and fixed by the nut; thrust bearings are symmetrically arranged on both sides of the thrust plate, and radial bearings are sleeved on the first sleeve and the second sleeve respectively;

[0007] Each of the thrust bearing and radial bearing is an air suspension or magnetic suspension bearing;

[0008] The motor rotor comprises a magnetic steel sleeve, a magnetic steel and a magnetic steel head; the magnetic steel sleeve and the magnetic steel are coaxially arranged, and the magnetic steel sleeve is sleeved on the magnetic steel and inserted in the inner cavity of the motor stator; magnetic steel heads are symmetrically sleeved coaxially inside the two ends of the magnetic steel sleeve, and each of the magnetic steel heads is a vertically arranged T-shaped annular structure, and its bottom matches the interior of the magnetic steel sleeve, and the magnetic steel is axially positioned respectively; a groove is coaxially embedded in the top of each of the magnetic steel heads, and one end of each of the pull rods is respectively sleeved in the groove corresponding to the magnetic steel head, and the first sleeve and the second sleeve are respectively clamped on the boss corresponding to the magnetic steel head;

[0009] The housing assembly comprises an air filter, a filter mounting base, a housing body, a right sealing plate, a left sealing plate and a bearing seat; a cylindrical inner cavity is horizontally opened in the housing body, and the left end of the inner cavity of the housing body vertically extends out of the left end face of the housing body, the motor stator is coaxially arranged with the inner cavity of the housing body, and is fixedly installed in the inner cavity of the housing body; a filter mounting base is also arranged side by side on the left end face of the housing body against its outer wall, the filter mounting base is a circular ring structure, and is coaxially arranged with the inner cavity of the housing body, the right end face of the filter mounting base is screwed and fixed to the housing body, and inside the left end An air filter is also sleeved and fixedly provided; a bearing seat is also arranged side by side and close to the inner wall on the left end surface of the shell body, and the bearing seat is a circular ring structure and is arranged inside the filter installation base, the bearing seat and the inner cavity of the shell body are arranged coaxially, and the two are screwed and fixed; a left sealing plate is also coaxially provided on the left end surface of the bearing seat, the left sealing plate is a straw hat-shaped structure, and its large end surface is screwed and fixed to the bearing seat; a right sealing plate is also arranged side by side and close to the right end surface of the shell body, and the right sealing plate is a straw hat-shaped structure, the right sealing plate is coaxially provided with the inner cavity of the shell body, and its large end surface is screwed and fixed to the shell body;

[0010] An impeller placement groove matching the impeller is also embedded inside the right end of the shell body, and the impeller placement groove is coaxially arranged with the inner cavity of the shell body, and is respectively connected with the inner cavity of the shell body and the interior of the right sealing plate; the other end of the right pull rod extends horizontally to the interior of the right sealing plate, and the impeller is located in the impeller placement groove and rotates freely in the impeller placement groove;

[0011] An air flow channel is also embedded in the wall of the shell body along its circumferential direction. The air flow channel is a circular ring structure and is coaxially arranged with the inner cavity of the shell body. The right end of the air flow channel is set at the same position as the right end of the inner cavity of the shell body, and its left end vertically extends out of the left end face of the shell body and is connected with the interior of the filter mounting base; a bearing cooling air hole is also vertically penetrated on the small end face of the left sealing plate, and the bearing cooling air hole is coaxially arranged with the left sealing plate, and is respectively connected with the interior of the filter mounting base and the interior of the left sealing plate; a plurality of cooling air holes are also vertically spaced and evenly distributed on the inner wall of the inner cavity of the shell body along its circumferential direction, and each of the cooling air holes extends vertically outward and is respectively connected with the air flow channel.

[0012] Preferably, a small hole for magnetizing the magnetic steel is provided in the middle of each magnetic steel head.

[0013] Preferably, a thrust bearing placement groove is embedded between the large end surface of the left sealing plate and the bearing seat. The thrust bearing placement groove is coaxially arranged with the inner cavity of the shell body, and is respectively communicated with the interior of the left sealing plate and the inner cavity of the shell body; the other end of the left pull rod extends horizontally to the interior of the left sealing plate, and the thrust plate and the thrust bearing are both located in the thrust bearing placement groove, and can rotate freely in the thrust bearing placement groove.

[0014] Preferably, a plurality of second reinforcing ribs are evenly distributed vertically along the circumferential direction on the right end surface of the inner cavity of the shell body, each of the second reinforcing ribs is arranged in the impeller placement groove, and is arranged without interfering with the impeller, and respectively supports the radial bearing on the right; the radial bearing on the left is supported on the right end surface of the bearing seat, and a plurality of first reinforcing ribs are evenly distributed along the circumferential direction in the air flow channel, and each of the first reinforcing ribs is fixedly connected to the inner and outer side walls of the air flow channel.

[0015] Preferably, an inner flow channel of the casing is embedded between the impeller placement groove and the right sealing plate, and the inner flow channel of the casing is arranged in the casing body, the inner flow channel of the casing is coaxially arranged with the impeller placement groove, and is respectively connected with the interior of the impeller placement groove and the right sealing plate; an inner flow channel of the casing is vertically opened on the outer wall of the right end of the casing body, and the casing outlet extends vertically inward and is connected with the inner flow channel of the casing.

[0016] Beneficial effects of the present invention:

[0017] (1) The structural design of the present invention is scientific and reasonable, and the size and weight of the whole machine are reduced through the integrated shell design;

[0018] (2) The present invention realizes double cooling of the interior of the shell by providing air flow channels and cooling holes on the shell body and bearing cooling holes on the left sealing plate. The cooling effect is remarkable, and the damage of the internal rotor assembly caused by cooling and heat dissipation problems during high-speed rotation is avoided, thereby improving the service life of the centrifugal compressor.

[0019] (3) The present invention does not require a lubricating oil system, consumes less energy, and the output gas is clean and oil-free;

[0020] (4) In the present invention, both the thrust bearing and the radial bearing are air suspension or magnetic suspension bearings, and there is no contact between the shaft and the bearing, which has low noise, high efficiency and long service life;

[0021] (5) When the motor rotor of the present invention rotates, the second sleeve drives the impeller to rotate, and the generated axial force acts on the thrust bearing through the thrust plate. When the thrust plate and the thrust bearing work, a high-pressure air model is generated, thereby avoiding the collision between the impeller and the casing assembly, thereby improving the service life of the rotor assembly;

[0022] (6) The present invention adopts a labyrinth-free seal to reduce the risk of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic structural diagram of a centrifugal compressor for a hydrogen fuel cell according to the present invention.

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the middle shell assembly.

[0026] Figure 3 for Figure 2 Top view of the .

[0027] Figure 4 for Figure 2 Side view of.

[0028] Figure 5 for Figure 1 Schematic diagram of the structure of the mid-rotor assembly.

[0029] Among them, 1-air filter; 2-filter mounting base; 3-radial bearing; 4-first reinforcing rib; 5-motor stator; 6-housing body; 7-motor rotor; 8-air flow channel; 9-impeller; 10-right sealing plate; 11-thrust plate; 12-bearing cooling holes; 13-left sealing plate; 14-thrust bearing; 15-bearing seat; 16-cooling holes; 17-second reinforcing rib; 18-flow channel in casing; 19-casing outlet; 20-impeller placement groove; 21-thrust bearing placement groove; 22-first shaft sleeve; 23-magnetic steel sleeve; 24-magnet; 25-magnetic steel head; 26-second shaft sleeve; 27-impeller; 28-nut; 29-pull rod. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below through specific implementation methods.

[0031] A centrifugal compressor for a hydrogen fuel cell of the present invention comprises a housing assembly, a motor stator 5, a thrust plate 11, a thrust bearing 14, a radial bearing 3, a first sleeve 22, a tie rod 29, a second sleeve 26, an impeller 27, a nut 28 and a motor rotor 7; Figure 1 , Figure 5 As shown, a motor stator 5 is horizontally fixed inside the housing assembly, and a motor rotor 7 is inserted into the inner cavity of the motor stator 5. Both ends of the motor rotor 7 extend vertically out of the motor stator 5, and the two are freely rotatably connected.

[0032] The motor rotor 7 of the present invention includes a magnetic steel sleeve 23, a magnetic steel 24 and a magnetic steel head 25; Figure 1 , Figure 5 As shown, the magnetic steel sleeve 23 and the magnetic steel 24 are coaxially arranged, and the magnetic steel sleeve 23 is sleeved on the magnetic steel 24 and inserted into the inner cavity of the motor stator 5; magnetic steel heads 25 are symmetrically sleeved coaxially inside the two ends of the magnetic steel sleeve 23, and each magnetic steel head 25 is a vertically arranged T-shaped ring structure, and its bottom matches the interior of the magnetic steel sleeve 23, and axially positions the magnetic steel 24 respectively; wherein, a small hole for magnetizing the magnetic steel 24 is also opened in the middle position of each magnetic steel head 25.

[0033] A groove is coaxially embedded in the top of each magnetic steel seal 25, and one end of each pull rod 29 is respectively sleeved in the groove of the corresponding magnetic steel seal 25; Figure 1 , Figure 5 As shown, a nut 28, a thrust plate 11 and a first sleeve 22 are coaxially sleeved in sequence from left to right on a left pull rod 29, the thrust plate 11, the first sleeve 22 and a magnetic steel head 25 on the left are clamped together in sequence, and the thrust plate 11 is axially locked and fixed by the nut 28; a nut 28, an impeller 27 and a second sleeve 26 are coaxially sleeved in sequence from right to left on a right pull rod 29, the impeller 27, the second sleeve 26 and a magnetic steel head 25 on the right are clamped together in sequence, and the impeller 27 is axially locked and fixed by the nut 28; wherein the first sleeve 22 and the second sleeve 26 are respectively clamped on the bosses of the corresponding magnetic steel head 25.

[0034] like Figure 1 , Figure 5 As shown, thrust bearings 14 are symmetrically provided on both sides of the thrust plate 11, and radial bearings 3 are sleeved on the first sleeve 22 and the second sleeve 26 respectively; wherein each thrust bearing 14 and radial bearing 3 is an air suspension or magnetic suspension bearing.

[0035] The housing assembly of the present invention comprises an air filter 1, a filter mounting base 2, a housing body 6, a right sealing plate 10, a left sealing plate 13 and a bearing seat 15; Figures 1 to 4 As shown, a cylindrical inner cavity is horizontally opened in the shell body 6, and the left end of the inner cavity of the shell body 6 extends vertically out of the left end face of the shell body 6, the motor stator 5 is coaxially arranged with the inner cavity of the shell body 6, and is fixedly installed in the inner cavity of the shell body 6; on the left end face of the shell body 6, a filter mounting base 2 is also arranged in parallel and close to its outer wall, and the filter mounting base 2 is a circular ring structure and is coaxially arranged with the inner cavity of the shell body 6, the right end face of the filter mounting base 2 is screwed and fixed to the shell body 6, and an air filter 1 is also sleeved and fixed inside the left end thereof; wherein, the air filter 1 matches the interior of the filter mounting base 2, and the four sides of the air filter 1 are sealed and fixedly connected with the inner wall of the filter mounting base 2, so as to facilitate the filtered air to enter the interior of the shell.

[0036] In the present invention, an air flow channel 8 is embedded in the wall of the housing body 6 along its circumferential direction. Figures 1 to 4 As shown, the air flow channel 8 is a circular ring structure and is coaxially arranged with the inner cavity of the shell body 6. The right end of the air flow channel 8 is set at the same position as the right end of the inner cavity of the shell body 6, and its left end vertically extends out of the left end face of the shell body 6 and is connected to the interior of the filter mounting base 2.

[0037] In the present invention, a bearing seat 15 is provided on the left end surface of the housing body 6 and close to the inner wall thereof, and the bearing seat 15 is an annular structure and is provided inside the filter plate mounting base 2; Figures 1 to 4 As shown, the bearing seat 15 is coaxially arranged with the inner cavity of the shell body 6, and the two are screwed and fixed; wherein, a radial bearing placement groove is vertically penetrated through the right end face of the bearing seat 15, and the radial bearing placement groove is coaxially arranged with the bearing seat 15, and is connected with the inner cavity of the shell body 6, and a radial bearing 3 on the left is placed in the radial bearing placement groove and supported on the right end face of the bearing seat 15.

[0038] The present invention also coaxially provides a left sealing plate 13 on the left end surface of the bearing seat 15. The left sealing plate 13 is a straw hat-shaped structure, and its large end surface is screwed and fixed to the bearing seat 15; Figures 1 to 4 As shown, the left sealing plate 13 and the air filter 1 are arranged without interfering with each other, and a bearing cooling hole 12 is vertically penetrated on the small end face thereof. The bearing cooling hole 12 is coaxially arranged with the left sealing plate 13, and is respectively connected with the interior of the filter mounting base 2 and the interior of the left sealing plate 13, so as to cool the thrust bearing 14 and the radial bearing 3.

[0039] like Figures 1 to 4As shown, a thrust bearing placement groove 21 is embedded between the large end surface of the left sealing plate 13 and the bearing seat 15. The thrust bearing placement groove 21 is coaxially arranged with the inner cavity of the shell body 6, and is respectively connected with the interior of the left sealing plate 13 and the inner cavity of the shell body 6; the other end of the left pull rod 29 extends horizontally to the interior of the left sealing plate 13, and the thrust plate 11 and the thrust bearing 14 are both located in the thrust bearing placement groove 21, and can rotate freely in the thrust bearing placement groove 21.

[0040] like Figures 1 to 4 As shown, a plurality of cooling holes 16 are evenly distributed vertically on the inner wall of the inner cavity of the housing body 6 along its circumferential direction. Each cooling hole 16 extends vertically outward and is connected to the air flow channel 8 for cooling the motor stator and the motor rotor.

[0041] The present invention also has a right sealing plate 10 arranged in parallel on the right end surface of the shell body 6, and the right sealing plate 10 is a straw hat-shaped structure; Figures 1 to 4 As shown, the right sealing plate 10 is coaxially arranged with the inner cavity of the shell body 6 , and its large end surface is screwed and fixed to the shell body 6 .

[0042] like Figures 1 to 4 As shown, an impeller placement groove 20 matching the impeller 27 is also embedded inside the right end of the shell body 6. The impeller placement groove 20 is coaxially arranged with the inner cavity of the shell body 6, and is respectively connected with the inner cavity of the shell body 6 and the interior of the right sealing plate 10; the other end of a pull rod 29 on the right extends horizontally to the interior of the right sealing plate 10, and the impeller 27 is located in the impeller placement groove 20 and rotates freely in the impeller placement groove 20.

[0043] like Figures 1 to 4 As shown, a plurality of second reinforcing ribs 17 are evenly distributed vertically along the circumferential direction on the right end face of the inner cavity of the shell body 6. Each second reinforcing rib 17 is arranged in the impeller placement groove 20, and is arranged without interfering with the impeller 27, and supports a radial bearing 3 on the right side respectively.

[0044] like Figures 1 to 4 As shown, a plurality of first reinforcing ribs 4 are evenly and spaced apart in the circumferential direction of the air flow channel 8 , and each of the first reinforcing ribs 4 is fixedly connected to the inner and outer side walls of the air flow channel 8 .

[0045] The present invention further includes an inner casing flow channel 18 embedded between the impeller placement groove 20 and the right sealing plate 10, and the inner casing flow channel 18 is disposed in the housing body 6; the inner casing flow channel 18 is disposed coaxially with the impeller placement groove 20, and is communicated with the impeller placement groove 20 and the interior of the right sealing plate 10 respectively; Figures 1 to 4As shown, a casing outlet 19 is vertically opened on the outer wall of the right end of the casing body 6, and the casing outlet 19 extends vertically inward and is connected with the flow channel 18 in the casing, so that the air flows through the flow channel 18 in the casing after the impeller does work, and then enters the hydrogen fuel cell system through the casing outlet 19.

[0046] The working principle of the present invention is as follows: after the air is filtered by the air filter 1, a part of the air enters the air flow channel 8, and then enters the shell body 6 through the cooling air holes 16 to cool the motor stator 5 and the motor rotor 6; the other part enters the bearing seat 15 through the bearing cooling air holes 12 to cool the thrust bearing 14 and the radial bearing 3, and then enters the impeller placement groove 20, enters the flow channel 18 in the casing after the impeller 27 is worked, and finally enters the hydrogen fuel cell system through the casing outlet 19.

[0047] Beneficial effects of the present invention:

[0048] (1) The structural design of the present invention is scientific and reasonable, and the size and weight of the whole machine are reduced through the integrated shell design;

[0049] (2) The present invention realizes double cooling of the interior of the housing by providing an air flow channel 8 and a cooling air hole 16 on the housing body 6 and providing a bearing cooling air hole 12 on the left sealing plate 13. The cooling effect is remarkable, and the damage of the internal rotor assembly caused by cooling and heat dissipation problems during high-speed rotation is avoided, thereby improving the service life of the centrifugal compressor;

[0050] (3) The present invention does not require a lubricating oil system, consumes less energy, and the output gas is clean and oil-free;

[0051] (4) In the present invention, the thrust bearing 14 and the radial bearing 3 are both air suspension or magnetic suspension bearings, and there is no contact between the shaft and the bearings, which has low noise, high efficiency and long service life;

[0052] (5) When the motor rotor 7 in the present invention rotates, the second sleeve 26 drives the impeller 27 to rotate, and the generated axial force acts on the thrust bearing 14 through the thrust plate 11. When the thrust plate 11 and the thrust bearing 14 work, a high-pressure air mold is generated, thereby avoiding the collision between the impeller 27 and the housing assembly, thereby improving the service life of the rotor assembly;

[0053] (6) The present invention adopts a labyrinth-free seal to reduce the risk of leakage.

[0054] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering technicians in the field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the technical requirements.

Claims

1. A centrifugal compressor for a hydrogen fuel cell, characterized in that: The invention comprises a housing assembly, a motor stator, a thrust plate, a thrust bearing, a radial bearing, a first sleeve, a pull rod, a second sleeve, an impeller, a nut and a motor rotor; the motor stator is also horizontally fixed inside the housing assembly, and the motor rotor is inserted in the inner cavity of the motor stator, and the two ends of the motor rotor respectively extend vertically out of the motor stator, and the two are freely rotatably connected; pull rods are coaxially sleeved on the left and right end faces of the motor rotor, and coaxially sleeved on the left pull rod from left to right A nut, a thrust plate and a first sleeve are provided, and the thrust plate, the first sleeve and the motor rotor are clamped together in sequence, and the thrust plate is axially locked and fixed by the nut; a nut, an impeller and a second sleeve are coaxially sleeved in sequence from right to left on the right pull rod, and the impeller, the second sleeve and the motor rotor are clamped together in sequence, and the impeller is axially locked and fixed by the nut; thrust bearings are symmetrically provided on both sides of the thrust plate, and radial bearings are sleeved on the first sleeve and the second sleeve respectively; Each of the thrust bearing and radial bearing is an air suspension or magnetic suspension bearing; The motor rotor comprises a magnetic steel sleeve, a magnetic steel and a magnetic steel head; the magnetic steel sleeve and the magnetic steel are coaxially arranged, and the magnetic steel sleeve is sleeved on the magnetic steel and inserted in the inner cavity of the motor stator; magnetic steel heads are symmetrically sleeved coaxially inside the two ends of the magnetic steel sleeve, and each of the magnetic steel heads is a vertically arranged T-shaped annular structure, and its bottom matches the interior of the magnetic steel sleeve, and the magnetic steel is axially positioned respectively; a groove is coaxially embedded in the top of each of the magnetic steel heads, and one end of each of the pull rods is respectively sleeved in the groove corresponding to the magnetic steel head, and the first sleeve and the second sleeve are respectively clamped on the boss corresponding to the magnetic steel head; The housing assembly comprises an air filter, a filter mounting base, a housing body, a right sealing plate, a left sealing plate and a bearing seat; a cylindrical inner cavity is horizontally opened in the housing body, and the left end of the inner cavity of the housing body vertically extends out of the left end face of the housing body, the motor stator is coaxially arranged with the inner cavity of the housing body, and is fixedly installed in the inner cavity of the housing body; a filter mounting base is also arranged side by side on the left end face of the housing body against its outer wall, the filter mounting base is a circular ring structure, and is coaxially arranged with the inner cavity of the housing body, the right end face of the filter mounting base is screwed and fixed to the housing body, and inside the left end An air filter is also sleeved and fixedly provided; a bearing seat is also arranged side by side and close to the inner wall on the left end surface of the shell body, and the bearing seat is a circular ring structure and is arranged inside the filter installation base, the bearing seat and the inner cavity of the shell body are arranged coaxially, and the two are screwed and fixed; a left sealing plate is also coaxially provided on the left end surface of the bearing seat, the left sealing plate is a straw hat-shaped structure, and its large end surface is screwed and fixed to the bearing seat; a right sealing plate is also arranged side by side and close to the right end surface of the shell body, and the right sealing plate is a straw hat-shaped structure, the right sealing plate is coaxially provided with the inner cavity of the shell body, and its large end surface is screwed and fixed to the shell body; An impeller placement groove matching the impeller is also embedded inside the right end of the shell body, and the impeller placement groove is coaxially arranged with the inner cavity of the shell body, and is respectively connected with the inner cavity of the shell body and the interior of the right sealing plate; the other end of the right pull rod extends horizontally to the interior of the right sealing plate, and the impeller is located in the impeller placement groove and rotates freely in the impeller placement groove; An air flow channel is also embedded in the wall of the shell body along its circumferential direction. The air flow channel is a circular ring structure and is coaxially arranged with the inner cavity of the shell body. The right end of the air flow channel is set at the same position as the right end of the inner cavity of the shell body, and its left end vertically extends out of the left end face of the shell body and is connected with the interior of the filter mounting base; a bearing cooling air hole is also vertically penetrated on the small end face of the left sealing plate, and the bearing cooling air hole is coaxially arranged with the left sealing plate, and is respectively connected with the interior of the filter mounting base and the interior of the left sealing plate; a plurality of cooling air holes are also vertically spaced and evenly distributed on the inner wall of the inner cavity of the shell body along its circumferential direction, and each of the cooling air holes extends vertically outward and is respectively connected with the air flow channel.

2. A centrifugal compressor for a hydrogen fuel cell according to claim 1, characterized in that: A small hole for magnetizing the magnetic steel is also provided in the middle of each magnetic steel seal head.

3. The centrifugal compressor for a hydrogen fuel cell according to claim 1, characterized in that: A thrust bearing placement groove is also embedded between the large end surface of the left sealing plate and the bearing seat. The thrust bearing placement groove is coaxially arranged with the inner cavity of the shell body, and is respectively connected with the interior of the left sealing plate and the inner cavity of the shell body; the other end of the left pull rod extends horizontally to the interior of the left sealing plate, and the thrust plate and the thrust bearing are both located in the thrust bearing placement groove, and can rotate freely in the thrust bearing placement groove.

4. The centrifugal compressor for a hydrogen fuel cell according to claim 1, characterized in that: A plurality of second reinforcing ribs are evenly spaced vertically along the circumferential direction on the right end surface of the inner cavity of the shell body, each of the second reinforcing ribs is arranged in the impeller placement groove, and is arranged without interfering with the impeller, and respectively supports one of the radial bearings on the right; the radial bearing on the left is supported on the right end surface of the bearing seat, and a plurality of first reinforcing ribs are evenly spaced along the circumferential direction in the air flow channel, and each of the first reinforcing ribs is fixedly connected to the inner and outer side walls of the air flow channel.

5. The centrifugal compressor for a hydrogen fuel cell according to claim 1, characterized in that: An inner flow channel of the casing is also embedded between the impeller placement groove and the right sealing plate, and the inner flow channel of the casing is arranged in the casing body, the inner flow channel of the casing is coaxially arranged with the impeller placement groove, and is respectively communicated with the impeller placement groove and the interior of the right sealing plate; an inner flow channel of the casing is also vertically opened on the outer wall of the right end of the casing body, and the casing outlet extends vertically inward and is communicated with the inner flow channel of the casing.

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