A single-stage high-speed hydrogen fuel cell centrifugal compressor

Abstract

The present invention discloses a single-stage, high-speed hydrogen fuel cell centrifugal compressor, comprising an impeller, a housing, a rotating shaft, a motor rotor, and a motor stator. A bearing seat is coaxially arranged on the left side of the housing, with the small-diameter end of the bearing seat sleeved within the housing and the large-diameter end connected to the housing. An air intake casing is coaxially arranged on the left side of the bearing seat, and a rear cover is coaxially arranged on the right end face of the housing. A motor stator is coaxially arranged on the right side of the housing, and a motor rotor is inserted into the inner cavity of the motor stator. A rotating shaft is coaxially arranged on the left end of the motor rotor, with the left end of the rotating shaft extending horizontally into the air intake casing and sleeved coaxially with the impeller. An axial air bearing is coaxially sleeved on the left end of the rotating shaft, and a left radial air bearing and a right radial air bearing are coaxially sleeved on the axial bearing from left to right relative to the interior of the housing. The present invention adopts single-stage compression, increases the exhaust pressure of the compressor by increasing the impeller speed, and fully meets the use requirements of hydrogen fuel cell vehicles.

Description

Technical Field

[0001] The present invention relates to the field of hydrogen fuel cells, and in particular to a single-stage high-speed hydrogen fuel cell centrifugal compressor. Background Art

[0002] The air compressor is a crucial component of fuel cells, providing the oxygen necessary for the fuel cell stack's reaction. The higher the air pressure, the more efficient the hydrogen fuel cell. However, due to technical limitations, most domestic manufacturers currently operate at relatively low compressor speeds, typically below 100,000 rpm. Consequently, they typically employ a two-stage compression system to increase air pressure, with the air compressed by the first-stage impeller before entering the second-stage impeller for further compression. However, this results in a complex and bulky compressor structure, making it difficult to meet the demands of hydrogen fuel cell vehicles. Therefore, these issues urgently need to be addressed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a single-stage high-speed hydrogen fuel cell centrifugal compressor, which adopts single-stage compression and has only one impeller. The exhaust pressure of the compressor is increased by increasing the impeller speed, so that the entire compressor has a compact structure, small size and light weight, which fully meets the use requirements of hydrogen fuel cell vehicles.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A single-stage high-speed hydrogen fuel cell centrifugal compressor of the present invention, its innovation lies in: comprising an air intake casing, an impeller, a casing, a bearing seat, a rotating shaft, a motor rotor and a motor stator; a T-shaped bearing seat is coaxially provided on the left side of the horizontally arranged casing, the small diameter end of the bearing seat is coaxially sleeved on the left side of the casing, and the outer diameter of the large diameter end is larger than the outer diameter of the casing, and is fixedly connected to the left end face of the casing; an air intake casing is coaxially sleeved and fixed on the left side of the bearing seat, and a rear cover plate is also coaxially sleeved and fixed on the right end face of the casing; on the right side of the interior of the casing A motor stator is coaxially fixed horizontally, and a motor rotor is coaxially inserted in the inner cavity of the motor stator, and the two are freely rotatably connected; a rotating shaft is coaxially sleeved at the left end of the motor rotor, and the left end of the rotating shaft extends horizontally to the left into the air intake casing, and is coaxially sleeved with the impeller, and is axially locked and fixed by a nut; an axial air bearing is coaxially sleeved at the left end of the rotating shaft relative to the right side of the impeller, and a left radial air bearing and a right radial air bearing are coaxially sleeved on the left end relative to the inside of the casing from left to right, and are supported on the bearing seat by the left radial air bearing and the right radial air bearing;

[0005] A circular boss is also coaxially provided on the left end face of the bearing seat, the diameter of the boss is smaller than the outer diameter of the left end face of the bearing seat, and the two are integrally formed; an axial bearing mounting groove is coaxially embedded in the left end face of the boss of the bearing seat, the axial bearing mounting groove is circular, and its diameter is larger than the outer diameter of the axial air bearing; the axial air bearing is coaxially arranged in the axial bearing mounting groove and coaxially sleeved on the rotating shaft; two radial bearing mounting holes are also coaxially embedded and arranged horizontally in the bearing seat at intervals on the left and right, and the two radial bearing mounting holes are respectively matched with the left radial air bearing and the right radial air bearing, the left radial bearing mounting hole is connected to the axial bearing mounting groove, and the left radial air bearing is coaxially arranged in the corresponding radial bearing mounting hole and coaxially sleeved on the rotating shaft; the right radial bearing mounting hole extends horizontally to the right out of the bearing seat, and the right radial air bearing is coaxially arranged in the corresponding radial bearing mounting hole and coaxially sleeved on the rotating shaft.

[0006] Preferably, it also includes a rear side plate; a rear side plate mounting groove and a bearing seat mounting groove are coaxially embedded in the right end surface of the air intake casing from left to right, and the rear side plate mounting groove matches the rear side plate, and the bearing seat mounting groove matches the boss of the bearing seat; the left side of the bearing seat is coaxially sleeved in the bearing seat mounting groove of the air intake casing through its boss, and the rear side plate is sleeved in the rear side plate mounting groove of the air intake casing, thereby axially positioning the rear side plate; the left end of the rotating shaft extends horizontally to the left through the right radial air bearing, the left radial air bearing, the axial air bearing, and the rear side plate into the air intake casing, and the impeller is axially positioned through the rear side plate, and the impeller is driven to rotate at high speed.

[0007] Preferably, an air bearing air supply system is further included, and air is provided to the axial air bearing, the left radial air bearing and the right radial air bearing through the air bearing air supply system.

[0008] Preferably, it also includes a filter cartridge and a cover plate; a filter cartridge mounting hole matching the filter cartridge is embedded in the top of the air intake casing along its radial direction, and a cover plate is fixedly fitted on the top of the air intake casing relative to the filter cartridge mounting hole; the filter cartridge is coaxially placed in the filter cartridge mounting hole and is sealed by the cover plate to filter the air bearing air supply system.

[0009] Preferably, the air bearing air supply system includes a first air intake channel and a second air intake channel; 3 to 7 second air intake channels are evenly and spacedly embedded in the left end surface of the bearing seat along its circumferential direction, and the aperture of each second air intake channel is 3 to 7 mm, and are respectively arranged on the outside of the axial bearing mounting groove, and each second air intake channel is inclined outward toward the direction of the air intake casing, and one end thereof is respectively connected to the axial bearing mounting groove; the same number of first air intake channels as the second air intake channels are also evenly and spacedly embedded in the rear side plate along its circumferential direction, the aperture of each first air intake channel is consistent with the aperture of the corresponding second air intake channel, and its setting position corresponds to the setting position of each second air intake channel, the air inlet of the air intake casing is connected to the axial bearing mounting groove in sequence through the first air intake channel and the second air intake channel, and the high-pressure gas compressed by the compressor enters the axial bearing mounting groove and the radial bearing mounting hole through the first air intake channel and the second air intake channel, cooling and lubricating the axial air bearing, the left radial air bearing and the right radial air bearing.

[0010] Preferably, it also includes a first air outlet channel, a second air outlet channel, a third air outlet channel, a fourth air outlet channel, a fifth air outlet channel and a sixth air outlet channel; an annular third air outlet channel is also coaxially opened horizontally in the bearing seat, and the third air outlet channel is spaced apart on the outside of the radial bearing mounting hole; an annular first air outlet channel is also coaxially opened on the right end face of the bearing seat, the first air outlet channel is arranged between the bearing seat and the motor stator, and is coaxially arranged on the outside of the rotating shaft and is connected to the radial bearing mounting hole; a second air outlet channel is also coaxially opened between the first air outlet channel and the third air outlet channel, the second air outlet channel is obliquely arranged between the bearing seat and the motor stator, and the first air outlet channel is connected to the third air outlet channel through the second air outlet channel; a fourth air outlet channel is also coaxially opened obliquely in the bearing seat on the left side of the third air outlet channel Channel, the fourth air outlet channel is arranged in a trumpet shape toward the air intake casing, and the angle between it and the horizontal direction is 60°~80°; a fifth air outlet channel is also horizontally opened inside the air intake casing between the filter cartridge mounting hole and the fourth air outlet channel, and the filter cartridge mounting hole is connected with the fourth air outlet channel through the fifth air outlet channel; a sixth air outlet channel is also obliquely embedded and opened in the air intake casing between the filter cartridge mounting hole and the air inlet of the air intake casing, and the angle between the sixth air outlet channel and the horizontal direction is 45°~60°, and the filter cartridge mounting hole is connected with the air inlet of the air intake casing through the sixth air outlet channel; air enters the air inlet of the air intake casing after passing through the first air outlet channel, the second air outlet channel, the third air outlet channel, the fourth air outlet channel, the fifth air outlet channel, the filter cartridge and the sixth air outlet channel, and is then compressed into high-pressure gas by the compressor, thereby forming an air bearing air supply system for circulation.

[0011] Preferably, a plurality of guide holes are evenly spaced along the circumferential direction of the air intake casing, and each of the guide holes is arranged between the air inlet of the air intake casing and the rear side panel mounting groove; the number of the guide holes is 30 to 60, and the diameter of each of the guide holes is 0.5 to 4 mm, and the angle between each of the guide holes and the horizontal direction is 35° to 55°, and the angle between each of the guide holes and the sixth air outlet channel is 95°.

[0012] Preferably, it also includes a cooling water system, and the cooling water system includes a cooling water inlet, a first cooling water channel, a second cooling water channel and a cooling water outlet; a cooling water inlet is vertically embedded in the top of the casing on the side of the air intake casing, and a cooling water outlet is vertically embedded in the top on the side of the rear cover plate; a first annular cooling water channel is coaxially provided on the outside of the bearing seat, the first cooling water channel is connected to the cooling water inlet, and is spaced outside the third air outlet channel, and is not interfered with the fourth air outlet channel; a second annular cooling water channel is coaxially provided on the outside of the motor stator, and the second cooling water channel is respectively connected to the first cooling water channel and the cooling water outlet; cooling water enters through the cooling water inlet, passes through the first cooling water channel and the second cooling water channel in sequence, and is discharged through the cooling water outlet, taking away the heat generated during the operation of the compressor.

[0013] Preferably, the inner surfaces of the two radial bearing mounting holes of the bearing seat are respectively provided with a high-temperature wear-resistant coating; the impeller is integrally milled by five-axis linkage, and the torque is transmitted between the rotating shaft and the impeller by interference fit.

[0014] Beneficial effects of the present invention:

[0015] (1) The present invention adopts single-stage compression, and the entire compressor has only one impeller. By increasing the impeller speed to increase the exhaust pressure of the compressor, the entire compressor has a compact structure, small size, and light weight, which fully meets the use requirements of hydrogen fuel cell vehicles;

[0016] (2) The present invention adopts single-stage compression and high-speed motor direct drive, with a maximum speed of more than 150,000 rpm and a maximum pressure of more than 3 bar;

[0017] (3) The present invention provides a cooling water system to ensure that the interior of the compressor casing is filled with cooling water during operation, thereby improving heat exchange efficiency;

[0018] (4) The present invention greatly improves the flow adjustment range of the compressor by providing a guide hole;

[0019] (5) The present invention provides an air bearing air supply system to form a circulation loop for cooling and lubricating the air bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. 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 any creative work. Figure 1 This is a structural schematic diagram of a single-stage high-speed hydrogen fuel cell centrifugal compressor of the present invention.

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the middle air intake casing.

[0022] Figure 3 for Figure 1 Schematic diagram of the structure of the middle bearing seat.

[0023] Among them, 1-cover plate; 2-filter cartridge; 3-air intake casing; 4-rear side plate; 5-impeller; 6-casing; 7-bearing seat; 8-rotating shaft; 9-motor stator; 10-rear cover plate; 11-axial air bearing; 12-left radial air bearing; 13-right radial air bearing; 14-sixth air outlet channel; 15-fifth air outlet channel; 16-fourth air outlet channel; 17-first air intake channel; 18-second air intake channel; 19-third air outlet channel; 20-second air outlet channel; 21-first air outlet channel; 22-cooling water inlet; 23-first cooling water channel; 24-second cooling water channel; 25-cooling water outlet; 26-filter cartridge mounting hole; 27-air intake casing air inlet; 28-guide hole; 29-radial bearing mounting hole; 30-axial bearing mounting slot; 31-rear side plate mounting slot; 32-bearing seat mounting slot. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below through specific implementation methods.

[0025] The present invention relates to a single-stage high-speed hydrogen fuel cell centrifugal compressor, comprising an air intake casing 3, a rear side plate 4, an impeller 5, a casing 6, a bearing seat 7, a rotating shaft 8, a motor rotor, a motor stator 9, an air bearing air supply system and a cooling water system; the specific structure is as follows Figures 1-3As shown, a T-shaped bearing seat 7 is coaxially provided on the left side of the horizontally arranged casing 6, and the small diameter end of the bearing seat 7 is coaxially sleeved on the left side of the casing 6, and the outer diameter of the large diameter end is larger than the outer diameter of the casing 6, and is fixedly connected to the left end face of the casing 6; an air intake casing 3 is coaxially sleeved and fixed on the left side of the bearing seat 7, and a rear cover plate 10 is also coaxially sleeved and fixed on the right end face of the casing 6; a motor stator 9 is coaxially fixed horizontally on the right side of the interior of the casing 6, and a motor rotor is coaxially inserted in the inner cavity of the motor stator 9, and the two are automatically connected. The motor is connected by rotation; a rotating shaft 8 is coaxially sleeved at the left end of the motor rotor. The left end of the rotating shaft 8 extends horizontally to the left into the air intake casing 3 and is coaxially sleeved with the impeller 5, and is axially locked and fixed by a nut; an axial air bearing 11 is coaxially sleeved at the left end of the rotating shaft 8 relative to the right side of the impeller 5, and a left radial air bearing 12 and a right radial air bearing 13 are coaxially sleeved thereon in sequence from left to right relative to the interior of the casing 6, and are supported on the bearing seat 7 by the left radial air bearing 12 and the right radial air bearing 13. The impeller 5 of the present invention is made of five-axis linkage integral milling, which greatly improves efficiency compared to traditional impellers 5; the rotating shaft 8 and impeller 5 use an interference fit to transmit torque, and the structure is simple and reliable.

[0026] The present invention also provides a circular boss coaxially on the left end face of the bearing seat 7, the diameter of the boss is smaller than the outer diameter of the left end face of the bearing seat 7, and the two are integrally formed; Figure 1 、 Figure 3 As shown, an axial bearing mounting groove 30 is coaxially embedded in the left end face of the boss of the bearing seat 7. The axial bearing mounting groove 30 is circular and its diameter is larger than the outer diameter of the axial air bearing 11. The axial air bearing 11 is coaxially arranged in the axial bearing mounting groove 30 and coaxially sleeved on the rotating shaft 8. Two radial bearing mounting holes 29 are coaxially embedded and horizontally embedded in the bearing seat 7 at intervals on the left and right sides, and the two radial bearing mounting holes 29 are matched with the left radial air bearing 12 and the right radial air bearing 13 respectively. The left radial air bearing 11 is coaxially arranged in the axial bearing mounting groove 30 and the right radial air bearing 13 is coaxially sleeved on the rotating shaft 8. The radial bearing mounting hole 29 is connected to the axial bearing mounting groove 30, and the left radial air bearing 12 is coaxially arranged in the corresponding radial bearing mounting hole 29 and coaxially sleeved on the rotating shaft 8; the right radial bearing mounting hole 29 extends horizontally to the right from the bearing seat 7, and the right radial air bearing 13 is coaxially arranged in the corresponding radial bearing mounting hole 29 and coaxially sleeved on the rotating shaft 8; wherein, the inner surfaces of the two radial bearing mounting holes 29 of the bearing seat 7 are also respectively provided with high-temperature wear-resistant coatings, which greatly improves the service life of the air bearings.

[0027] The present invention further provides a rear side plate mounting groove 31 and a bearing seat mounting groove 32 coaxially embedded in the right end surface of the air intake casing 3 from left to right, and the rear side plate mounting groove 31 matches the rear side plate 4, and the bearing seat mounting groove 32 matches the boss of the bearing seat 7; Figure 1 、 Figure 2 As shown, the left side of the bearing seat 7 is coaxially sleeved in the bearing seat mounting groove 32 of the air intake casing 3 through its boss, and the rear side plate 4 is sleeved in the rear side plate mounting groove 31 of the air intake casing 3, thereby axially positioning the rear side plate 4; the left end of the rotating shaft 8 of the present invention extends horizontally to the left through the right radial air bearing 13, the left radial air bearing 12, the axial air bearing 11, and the rear side plate 4 into the air intake casing 3, axially positioning the impeller 5 through the rear side plate 4, and driving the impeller 5 to rotate at high speed.

[0028] The present invention provides air to the axial air bearing 11, the left radial air bearing 12 and the right radial air bearing 13 through the air bearing air supply system; Figures 1-3 As shown, a filter cartridge mounting hole 26 matching the filter cartridge 2 is embedded in the top of the air intake casing 3 along its radial direction, and a cover plate 1 is fixedly fitted on the top of the air intake casing 3 relative to the filter cartridge mounting hole 26; the filter cartridge 2 is coaxially placed in the filter cartridge mounting hole 26 and is sealed by the cover plate 1 to filter the air bearing air supply system.

[0029] The air bearing air supply system includes a first air inlet channel 17, a second air inlet channel 18, a first air outlet channel 21, a second air outlet channel 20, a third air outlet channel 19, a fourth air outlet channel 16, a fifth air outlet channel 15 and a sixth air outlet channel 14; Figures 1-3 As shown, 3 to 7 second air intake channels 18 are evenly spaced and embedded along the circumferential direction of the left end surface of the bearing seat 7, and the aperture of each second air intake channel 18 is 3 to 7 mm, and they are respectively arranged on the outside of the axial bearing mounting groove 30, each second air intake channel 18 is tilted outward toward the direction of the air intake casing 3, and one end thereof is respectively connected to the axial bearing mounting groove 30; the same number of first air intake channels 17 as the second air intake channels 18 are also evenly spaced and embedded along the circumferential direction of the rear side plate 4, and each first air intake channel 17 has a diameter of 3 to 7 mm. The apertures are consistent with the apertures of the corresponding second air intake channels 18, and their setting positions correspond to the setting positions of each second air intake channel 18, so that the air inlet 27 of the air intake casing is connected to the axial bearing mounting groove 30 in sequence through the first air intake channel 17 and the second air intake channel 18; the high-pressure gas compressed by the compressor of the present invention enters the axial bearing mounting groove 30 and the radial bearing mounting hole 29 through the first air intake channel 17 and the second air intake channel 18, cooling and lubricating the axial air bearing 11, the left radial air bearing 12 and the right radial air bearing 13.

[0030] like Figures 1-3As shown, a third annular air outlet channel 19 is coaxially provided in the bearing seat 7, and the third air outlet channel 19 is spaced apart outside the radial bearing mounting hole 29; a first annular air outlet channel 21 is coaxially provided on the right end face of the bearing seat 7, the first air outlet channel 21 is provided between the bearing seat 7 and the motor stator 9, and coaxially provided outside the rotating shaft 8, and communicated with the radial bearing mounting hole 29; a second air outlet channel 20 is coaxially provided between the first air outlet channel 21 and the third air outlet channel 19, the second air outlet channel 20 is obliquely provided between the bearing seat 7 and the motor stator 9, and the first air outlet channel 21 is communicated with the third air outlet channel 19 through the second air outlet channel 20; a fourth air outlet channel 16 is coaxially provided obliquely on the left side of the third air outlet channel 19 in the bearing seat 7, the fourth air outlet channel 16 is arranged in a trumpet-shaped manner toward the air intake casing 3, and the angle between the fourth air outlet channel 16 and the horizontal direction is 60°~80°;

[0031] like Figures 1-3 As shown, a fifth air outlet channel 15 is horizontally provided inside the air intake casing 3 between the filter cartridge mounting hole 26 and the fourth air outlet channel 16, and the filter cartridge mounting hole 26 is communicated with the fourth air outlet channel 16 through the fifth air outlet channel 15; a sixth air outlet channel 14 is obliquely embedded and provided inside the air intake casing 3 between the filter cartridge mounting hole 26 and the air intake casing air inlet 27, and the angle between the sixth air outlet channel 14 and the horizontal direction is 45°~60°, and the filter cartridge mounting hole 26 is communicated with the air intake casing air inlet 27 through the sixth air outlet channel 14; the air of the present invention enters the air intake casing air inlet 27 after passing through the first air outlet channel 21, the second air outlet channel 20, the third air outlet channel 19, the fourth air outlet channel 16, the fifth air outlet channel 15, the filter cartridge 2 and the sixth air outlet channel 14, and is then compressed into high-pressure gas by the compressor, thereby forming an air bearing air supply system for circulation.

[0032] The present invention also provides a plurality of guide holes 28 evenly spaced along the circumferential direction of the air intake casing 3, and each guide hole 28 is provided between the air intake casing air inlet 27 and the rear side plate mounting groove 31; Figure 1 、 Figure 2 As shown, the number of guide holes 28 is 30 to 60, and the diameter of each guide hole 28 is 0.5 to 4 mm. Each guide hole 28 is at an angle of 35° to 55° with the horizontal direction, and the angle between each guide hole 28 and the sixth air outlet channel 14 is 95°. By providing the guide holes 28, the present invention greatly improves the flow adjustment range of the compressor.

[0033] The cooling water system of the present invention comprises a cooling water inlet 22, a first cooling water channel 23, a second cooling water channel 24 and a cooling water outlet 25; Figures 1-3As shown, a cooling water inlet 22 is vertically embedded in the top of the casing 6 on the side of the air intake casing 3, and a cooling water outlet 25 is vertically embedded in the top on the side of the rear cover 10; a first annular cooling water channel 23 is coaxially provided on the outside of the bearing seat 7, the first cooling water channel 23 is connected to the cooling water inlet 22, and is spaced outside the third air outlet channel 19, and is arranged without interfering with the fourth air outlet channel 16; a second annular cooling water channel 24 is coaxially provided on the outside of the motor stator 9, and the second cooling water channel 24 is respectively connected to the first cooling water channel 23 and the cooling water outlet 25; the cooling water of the present invention enters through the cooling water inlet 22, passes through the first cooling water channel 23 and the second cooling water channel 24 in sequence, and is discharged through the cooling water outlet 25, taking away the heat generated during the operation of the compressor; by setting up a cooling water system, it is ensured that the interior of the casing 6 is filled with cooling water during the operation of the compressor, thereby improving the heat exchange efficiency.

[0034] Working principle of the present invention:

[0035] (1) Working principle of the compressor: Air enters the impeller 5 through the air intake casing 3, is compressed at high speed by the impeller 5, and is converted into high-pressure gas and then drawn out for use in the hydrogen fuel cell system.

[0036] (2) Working principle of the air bearing air supply system: The high-pressure gas compressed by the compressor enters the axial bearing mounting groove 30 and the radial bearing mounting hole 29 through the first air inlet channel 17 and the second air inlet channel 18, cooling and lubricating the axial air bearing 11, the left radial air bearing 12 and the right radial air bearing 13; then the air enters the air inlet 27 of the air intake casing through the first air outlet channel 21, the second air outlet channel 20, the third air outlet channel 19, the fourth air outlet channel 16, the fifth air outlet channel 15, the filter cartridge 2 and the sixth air outlet channel 14, and is then compressed into high-pressure gas by the compressor, and the cycle is repeated.

[0037] (3) Working principle of the cooling water system: Cooling water enters through the cooling water inlet 22, passes through the first cooling water channel 23 and the second cooling water channel 24 in sequence, and is discharged through the cooling water outlet 25, taking away the heat generated during the operation of the compressor.

[0038] Beneficial effects of the present invention:

[0039] (1) The present invention adopts single-stage compression, and the entire compressor has only one impeller 5. By increasing the speed of the impeller 5 to increase the exhaust pressure of the compressor, the entire compressor has a compact structure, small size, and light weight, which fully meets the use requirements of hydrogen fuel cell vehicles;

[0040] (2) The present invention adopts single-stage compression and high-speed motor direct drive, with a maximum speed of more than 150,000 rpm and a maximum pressure of more than 3 bar;

[0041] (3) The present invention provides a cooling water system to ensure that the interior of the casing 6 is filled with cooling water during the operation of the compressor, thereby improving the heat exchange efficiency;

[0042] (4) The present invention greatly improves the flow adjustment range of the compressor by providing the guide hole 28;

[0043] (5) The present invention provides an air bearing air supply system to form a circulation loop for cooling and lubricating the air bearing.

[0044] The embodiments described above are merely descriptions of preferred implementations 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 to the technical solutions of the present invention made by ordinary engineering technicians in this field should fall within the scope of protection of the present invention. The technical contents to be protected by the present invention have been fully recorded in the technical requirements.

Claims

1. A single-stage high-speed hydrogen fuel cell centrifugal compressor, characterized by: It includes an air intake casing, an impeller, a casing, a bearing seat, a rotating shaft, a motor rotor and a motor stator; a T-shaped bearing seat is coaxially provided on the left side of the horizontally arranged casing, the small diameter end of the bearing seat is coaxially sleeved on the left side of the casing, and the outer diameter of the large diameter end is larger than the outer diameter of the casing, and is fixedly connected to the left end face of the casing; an air intake casing is coaxially sleeved and fixed on the left side of the bearing seat, and a rear cover is also coaxially sleeved and fixed on the right end face of the casing; a motor stator is coaxially fixed horizontally on the right side of the casing, and in the inner cavity of the motor stator A motor rotor is coaxially interspersed, and the two are freely rotatably connected; a rotating shaft is coaxially sleeved at the left end of the motor rotor, and the left end of the rotating shaft extends horizontally to the left into the air intake casing, and is coaxially sleeved with the impeller, and is axially locked and fixed by a nut; an axial air bearing is coaxially sleeved at the left end of the rotating shaft relative to the right side of the impeller, and a left radial air bearing and a right radial air bearing are coaxially sleeved on the left end relative to the interior of the casing from left to right, and are supported on the bearing seat by the left radial air bearing and the right radial air bearing; A circular boss is also coaxially provided on the left end face of the bearing seat, the diameter of the boss is smaller than the outer diameter of the left end face of the bearing seat, and the two are integrally formed; an axial bearing mounting groove is coaxially embedded in the left end face of the boss of the bearing seat, the axial bearing mounting groove is circular, and its diameter is larger than the outer diameter of the axial air bearing; the axial air bearing is coaxially arranged in the axial bearing mounting groove and coaxially sleeved on the rotating shaft; two radial bearing mounting holes are also coaxially embedded and arranged horizontally in the bearing seat at intervals on the left and right, and the two radial bearing mounting holes are respectively matched with the left radial air bearing and the right radial air bearing, the left radial bearing mounting hole is connected to the axial bearing mounting groove, and the left radial air bearing is coaxially arranged in the corresponding radial bearing mounting hole and coaxially sleeved on the rotating shaft; the right radial bearing mounting hole extends horizontally to the right out of the bearing seat, and the right radial air bearing is coaxially arranged in the corresponding radial bearing mounting hole and coaxially sleeved on the rotating shaft.

2. The single-stage high-speed hydrogen fuel cell centrifugal compressor according to claim 1, characterized in that: It also includes a rear side plate; a rear side plate mounting groove and a bearing seat mounting groove are coaxially embedded in the right end surface of the air intake casing from left to right, and the rear side plate mounting groove matches the rear side plate, and the bearing seat mounting groove matches the boss of the bearing seat; the left side of the bearing seat is coaxially sleeved in the bearing seat mounting groove of the air intake casing through its boss, and the rear side plate is sleeved in the rear side plate mounting groove of the air intake casing, thereby axially positioning the rear side plate; the left end of the rotating shaft extends horizontally to the left through the right radial air bearing, the left radial air bearing, the axial air bearing, and the rear side plate into the air intake casing, and the impeller is axially positioned through the rear side plate, and the impeller is driven to rotate at high speed.

3. The single-stage high-speed hydrogen fuel cell centrifugal compressor according to claim 2, characterized in that: An air bearing air supply system is also included, and air is supplied to the axial air bearing, the left radial air bearing, and the right radial air bearing through the air bearing air supply system.

4. The single-stage high-speed hydrogen fuel cell centrifugal compressor according to claim 3, characterized in that: It also includes a filter cartridge and a cover plate; a filter cartridge mounting hole matching the filter cartridge is embedded in the top of the air intake casing along its radial direction, and a cover plate is fixedly fitted on the top of the air intake casing relative to the filter cartridge mounting hole; the filter cartridge is coaxially placed in the filter cartridge mounting hole and is sealed by the cover plate to filter the air bearing air supply system.

5. The single-stage high-speed hydrogen fuel cell centrifugal compressor according to claim 4, characterized in that: The air bearing air supply system includes a first air intake channel and a second air intake channel; 3 to 7 second air intake channels are evenly and spacedly embedded in the left end surface of the bearing seat along its circumferential direction, and the aperture of each second air intake channel is 3 to 7 mm, and they are respectively arranged on the outside of the axial bearing mounting groove, each second air intake channel is inclined outward toward the direction of the air intake casing, and one end thereof is respectively connected to the axial bearing mounting groove; the same number of first air intake channels as the second air intake channels are also evenly and spacedly embedded in the rear side plate along its circumferential direction, the aperture of each first air intake channel is consistent with the aperture of the corresponding second air intake channel, and their setting positions are corresponding to the setting positions of each second air intake channel, the air inlet of the air intake casing is connected to the axial bearing mounting groove in sequence through the first air intake channel and the second air intake channel, and the high-pressure gas compressed by the compressor enters the axial bearing mounting groove and the radial bearing mounting hole through the first air intake channel and the second air intake channel, cooling and lubricating the axial air bearing, the left radial air bearing and the right radial air bearing.

6. The single-stage high-speed hydrogen fuel cell centrifugal compressor according to claim 5, characterized in that: It also includes a first air outlet channel, a second air outlet channel, a third air outlet channel, a fourth air outlet channel, a fifth air outlet channel and a sixth air outlet channel; an annular third air outlet channel is also coaxially opened horizontally in the bearing seat, and the third air outlet channel is spaced apart on the outside of the radial bearing mounting hole; an annular first air outlet channel is also coaxially opened on the right end face of the bearing seat, the first air outlet channel is arranged between the bearing seat and the motor stator, and is coaxially arranged on the outside of the rotating shaft and is connected to the radial bearing mounting hole; a second air outlet channel is also coaxially opened between the first air outlet channel and the third air outlet channel, the second air outlet channel is obliquely arranged between the bearing seat and the motor stator, and the first air outlet channel is connected to the third air outlet channel through the second air outlet channel; a fourth air outlet channel is also coaxially opened obliquely on the left side of the third air outlet channel in the bearing seat. , the fourth air outlet channel is arranged in a trumpet shape toward the air intake casing, and the angle between it and the horizontal direction is 60°~80°; a fifth air outlet channel is also horizontally opened inside the air intake casing between the filter cartridge mounting hole and the fourth air outlet channel, and the filter cartridge mounting hole is connected with the fourth air outlet channel through the fifth air outlet channel; a sixth air outlet channel is also obliquely embedded and opened in the air intake casing between the filter cartridge mounting hole and the air inlet of the air intake casing, and the angle between the sixth air outlet channel and the horizontal direction is 45°~60°, and the filter cartridge mounting hole is connected with the air inlet of the air intake casing through the sixth air outlet channel; air enters the air inlet of the air intake casing after passing through the first air outlet channel, the second air outlet channel, the third air outlet channel, the fourth air outlet channel, the fifth air outlet channel, the filter cartridge and the sixth air outlet channel, and is then compressed into high-pressure gas by the compressor, thereby forming an air bearing air supply system for circulation.

7. The single-stage high-speed hydrogen fuel cell centrifugal compressor according to claim 6, characterized in that: Several guide holes are evenly spaced along the circumference of the air intake casing, and each of the guide holes is arranged between the air inlet of the air intake casing and the rear side panel mounting slot; the number of the guide holes is 30 to 60, and the diameter of each of the guide holes is 0.5 to 4 mm. The angle between each of the guide holes and the horizontal direction is 35° to 55°, and the angle between each of the guide holes and the sixth air outlet channel is 95°.

8. The single-stage high-speed hydrogen fuel cell centrifugal compressor according to claim 6, characterized in that: It also includes a cooling water system, and the cooling water system includes a cooling water inlet, a first cooling water channel, a second cooling water channel and a cooling water outlet; a cooling water inlet is vertically embedded in the top of the casing on the side of the air intake casing, and a cooling water outlet is vertically embedded in the top on the side of the rear cover plate; a first annular cooling water channel is coaxially provided on the outside of the bearing seat, the first cooling water channel is connected to the cooling water inlet, and is spaced outside the third air outlet channel, and is not interfered with the fourth air outlet channel; a second annular cooling water channel is coaxially provided on the outside of the motor stator, and the second cooling water channel is respectively connected to the first cooling water channel and the cooling water outlet; cooling water enters through the cooling water inlet, passes through the first cooling water channel and the second cooling water channel in sequence, and is discharged through the cooling water outlet, taking away the heat generated during the operation of the compressor.

9. The single-stage high-speed hydrogen fuel cell centrifugal compressor according to claim 1, characterized in that: The inner surfaces of the two radial bearing mounting holes of the bearing seat are respectively provided with a high-temperature wear-resistant coating; the impeller is integrally milled by five-axis linkage, and the torque is transmitted between the rotating shaft and the impeller by interference fit.

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