Fuel cell air compressor

Abstract

The utility model provides a fuel cell air compressor which comprises an air compressor body, a turbine assembly and an air compression assembly, the air compressor body comprises a shell, a rotating shaft, a motor stator, a radial bearing seat, a first air foil bearing and a second air foil bearing, the turbine assembly comprises a first-stage volute, a first-stage impeller, a second-stage volute, a second-stage impeller and an interstage pipeline, the shell is provided with an air channel outlet, the air compression assembly is provided with an air flow channel for air circulation, and the air compression assembly is connected between the first air foil bearing and the first-stage impeller. In this way, the back-to-back design mode of the two stages of impellers is adopted, axial thrust can be counteracted, and therefore the axial force applied by aerodynamic loads in the axial direction is reduced, and the service life of the thrust bearing can be prolonged; and the air foil bearing structure is adopted, so that the friction between the bearing and the rotor can be reduced, the mechanical loss is reduced, meanwhile, the oil-free requirement of the operating environment of the cell stack is met, and the air foil bearing has the advantages of large bearing capacity, good stability and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to air compressor technology field especially fuel cell air compressor. BACKGROUND

[0002] Fuel cell air compressor is the most important part in fuel cell air supply system, its main function is to pressurize the air in atmospheric environment to the best operating pressure of fuel cell reactor, and provide the required air mass flow. Due to the particularity of fuel cell system electrode reaction and the importance as the core part of automobile, as the air compressor of air supply system, it needs to meet the characteristics such as oil-free, low power consumption, high power density, low cost, low noise, high reliability and good dynamic performance. In order to meet these requirements, the mainstream technology route of fuel cell air compressor is the centrifugal air compressor driven by super-speed permanent magnet motor and supported by dynamic pressure foil air bearing.

[0003] At present, the existing fuel cell air compressor occupies large space and is heavy, and generates large noise in the working process, which is one of the main noise sources of fuel cell system; fuel cell air compressor has high parasitic efficiency, about 20% of fuel cell system power, and among the cost of fuel cell system, air compressor is the second largest cost source, accounting for 20% of the total cost; in addition, during the operation of the air compressor, frequent friction leads to large mechanical loss, large vibration response, many start-stop times, which affects the service life of the air compressor.

[0004] Therefore, it is necessary to provide a fuel cell air compressor to solve or at least alleviate the above problems. CONTENT OF THE UTILITY MODEL

[0005] The main purpose of the utility model is to provide a fuel cell air compressor to solve the problem of frequent friction and vibration of the fuel cell air compressor in the prior art, thereby affecting the service life.

[0006] To achieve the above purpose, the utility model provides a fuel cell air compressor, which comprises an air compressor body, a turbine assembly and a compression assembly, wherein,

[0007] The air compressor body comprises a shell, a rotating shaft, a motor stator, a radial bearing seat and first and second air foil bearings arranged in the axial direction of the rotating shaft, and the turbine assembly comprises a primary volute, a primary impeller, a secondary volute, a secondary impeller and an inter-stage pipeline, wherein,

[0008] The shell has an air passage outlet, the shell comprises a primary compression end and a secondary compression end, the primary volute is connected to the primary compression end, the secondary volute is connected to the secondary compression end, and the two ends of the inter-stage pipeline are in communication with the primary volute and the secondary volute respectively;

[0009] The rotating shaft penetrates the motor stator, and two ends of the rotating shaft are rotatably penetrated by the first air foil bearing and the second air foil bearing respectively, the radial bearing seat is connected to the primary compression end, the first air foil bearing is connected in the radial bearing seat, the primary impeller is connected to one end of the rotating shaft at the primary compression end, and the secondary impeller is connected to one end of the rotating shaft at the secondary compression end.

[0010] The compression assembly has a gas flow channel for gas flow, and the compression assembly is connected between the first air foil bearing and the primary impeller.

[0011] Preferably, the compression assembly comprises a thrust bearing seat, a thrust disc, and a first air foil thrust bearing and a second air foil thrust bearing which are oppositely arranged in the axial direction, the thrust bearing seat is connected between the radial bearing seat and the primary impeller, the thrust bearing seat has the gas flow channel, and the inner side of the thrust bearing seat is recessed to form a mounting space, the thrust disc has a through hole for the rotating shaft to penetrate, the thrust disc, the first air foil thrust bearing and the second air foil thrust bearing are arranged in the mounting space and are sleeved on the rotating shaft, and the thrust disc is attached to the shaft shoulder of the rotating shaft, and the first air foil thrust bearing and the second air foil thrust bearing are connected to the two sides of the thrust disc respectively.

[0012] Preferably, the first limiting assembly comprises a first bearing retainer and a first positioning pin for limiting the rotation of the first air foil bearing in the circumferential direction, the first bearing retainer abuts the outer side of the first air foil bearing, and the first positioning pin is arranged in the axial direction and penetrates the first bearing retainer and extends into the first air foil bearing.

[0013] Preferably, the second limiting assembly comprises a second bearing retainer and a second positioning pin for limiting the rotation of the second air foil bearing in the circumferential direction, the second bearing retainer abuts the outer side of the second air foil bearing, and the second positioning pin is arranged in the axial direction and penetrates the second bearing retainer and extends into the second air foil bearing.

[0014] Preferably, the inner side of the thrust bearing seat is convexly formed with a plurality of arc-shaped bosses arranged along the circumferential direction of the thrust bearing seat, an air passage gap is formed between each two adjacent arc-shaped bosses, a channel is formed between the arc-shaped bosses and the outer periphery of the thrust bearing seat, a slanting through hole is formed in the thrust bearing seat, one end of the slanting through hole extends to the outer side of the thrust bearing seat, the other end of the slanting through hole extends to the channel, and a plurality of radial air passages are arranged along the circumferential direction of the thrust bearing seat.

[0015] Preferably, a plurality of air holes are formed in the radial bearing seat and arranged in a scattered manner, and the air holes are arranged in an axial direction.

[0016] Preferably, the sealing disc is further provided, the sealing disc has a shaft hole for the rotating shaft to penetrate, the sealing disc is sleeved on the rotating shaft and arranged between the secondary impeller and the second bearing retainer.

[0017] Preferably, the first spacer sleeve is further provided, the first spacer sleeve is sleeved on one end of the rotating shaft at the primary compression end, and the thrust bearing seat is sleeved on the first spacer sleeve.

[0018] Preferably, the second spacer sleeve is further provided, the second spacer sleeve is sleeved on one end of the rotating shaft at the secondary compression end, and the sealing disc is sleeved on the second spacer sleeve.

[0019] Preferably, the shell has a spiral water channel, the shell is further provided with a water cooling inlet and a water cooling outlet, and two ends of the spiral water channel are respectively communicated with the water cooling inlet and the water cooling outlet.

[0020] Compared with the prior art, the utility model has the beneficial effects that:

[0021] The utility model provides a kind of fuel cell air compressor, including air compressor body, turbine assembly and gas compression component, air compressor body includes shell, shaft, motor stator, radial bearing seat and the first air foil bearing and second air foil bearing being oppositely arranged along the shaft axis that are built-in in shell, turbine assembly includes primary volute, primary impeller, secondary volute, secondary impeller and interstage duct, shell has air passage outlet, shell includes primary gas compression end and secondary gas compression end, primary volute is connected at primary gas compression end, secondary volute is connected at secondary gas compression end, the two ends of interstage duct are respectively with primary volute and secondary volute intercommunication arrangement, shaft penetrates motor stator, and the two ends of shaft are respectively rotatably penetrated first air foil bearing and second air foil bearing, radial bearing seat is connected at primary gas compression end, first air foil bearing is connected in radial bearing seat, primary impeller is connected at one end of shaft in primary gas compression end, secondary impeller is connected at one end of shaft in secondary gas compression end, gas compression component has airflow passage for gas circulation, and gas compression component is connected between first air foil bearing and primary impeller.Such two-stage impeller back-to-back design form can realize axial thrust mutual offset, to reduce the axial force of aerodynamic load in axial direction, can improve the service life of thrust bearing;And its air foil bearing structure can reduce bearing and rotor friction, reduce mechanical loss, meet the oil-free requirement of battery stack operating environment simultaneously, air foil bearing has the advantages such as large carrying capacity, good stability. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in these drawings without creative labor.

[0023] Figure 1 It is the three-dimensional schematic view of the overall structure in one embodiment of the utility model;

[0024] Figure 2 It is the three-dimensional schematic view of another view of the overall structure in one embodiment of the utility model;

[0025] Figure 3 It is the cross-sectional schematic view of the overall structure in one embodiment of the utility model;

[0026] Figure 4 It is the cross-sectional enlarged schematic view of gas compression component part in one embodiment of the utility model;

[0027] Figure 5It is the three-dimensional schematic view of the thrust bearing seat in one embodiment of the utility model;

[0028] Figure 6 It is the three-dimensional schematic view of the back of the thrust bearing seat in one embodiment of the utility model;

[0029] Figure 7 It is the three-dimensional schematic view of the radial bearing seat in one embodiment of the utility model;

[0030] Figure 8 It is the explosion schematic view of each element in the shell in one embodiment of the utility model;

[0031] Figure 9 It is the cross section schematic view of the shell in one embodiment of the utility model.

[0032] The utility model realizes, function characteristics and advantages will be further explained in conjunction with embodiment, refer to the drawing.

[0033] Explanation of figure mark:

[0034] 10, air compressor body;110, shell;111, air passage outlet;112, primary air compression end;113, secondary air compression end;114, spiral water channel;115, water cooling inlet;116, water cooling outlet;117, inner wall passage;118, inclined passage;120, rotating shaft;130, motor stator;140, radial bearing seat;141, air hole;150, first air foil bearing;160, second air foil bearing;170, first limiting assembly;171, first bearing baffle ring;172, first positioning pin;180, second limiting assembly;181, second bearing baffle ring;182, second positioning pin;190, sealing disc;191, second spacer sleeve;20, turbine assembly;210, primary volute;220, primary impeller;230, secondary volute;240, secondary impeller;250, interstage pipe;30, air compression assembly;310, thrust bearing seat;311, arc-shaped boss;312, air gap;313, groove;314, inclined through hole;315, radial air passage;316, first spacer sleeve;320, thrust disc;330, first air foil thrust bearing;340, second air foil thrust bearing. Specific implementation

[0035] It should be understood that the specific embodiments described herein are merely intended to explain the utility model, and are not used to limit the utility model.

[0036] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), if the specific posture changes, the directional indications will also change accordingly.

[0038] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0039] Please refer to the accompanying drawings Figures 1-9 The present application provides a fuel cell air compressor in an embodiment, which comprises an air compressor body 10, a turbine assembly 20 and a compression assembly 30. Firstly, it should be noted that the axial direction in the present application refers to the axial extension direction of the rotating shaft 120; and unlike the fuel cell air compressor in the prior art, which occupies a large space and has a heavy weight, and in the running process, due to frequent friction, it causes large mechanical loss, large vibration response, many start-stop times, and affects the service life of the air compressor. The present application solves the above-mentioned defects in the prior art by providing a fuel cell air compressor, which is as follows:

[0040] The air compressor body 10 comprises a shell 110, a rotating shaft 120, a motor stator 130, a radial bearing seat 140, and a first air foil bearing 150 and a second air foil bearing 160 arranged axially opposite to the rotating shaft 120, the turbine assembly 20 comprises a first-stage volute 210, a first-stage impeller 220, a second-stage volute 230, a second-stage impeller 240, and an inter-stage pipe 250; wherein the shell 110 is provided with an air passage outlet 111, the shell 110 comprises a first-stage compression end 112 and a second-stage compression end 113, the first-stage volute 210 is connected to the first-stage compression end 112, the second-stage volute 230 is connected to the second-stage compression end 113, and the two ends of the inter-stage pipe 250 are respectively arranged in communication with the first-stage volute 210 and the second-stage volute 230; the rotating shaft 120 penetrates through the motor stator 130, and the two ends of the rotating shaft 120 are respectively rotatably penetrated through the first air foil bearing 150 and the second air foil bearing 160, the radial bearing seat 140 is connected to the first-stage compression end 112, the first air foil bearing 150 is connected in the radial bearing seat 140, the first-stage impeller 220 is connected to one end of the rotating shaft 120 located at the first-stage compression end 112, and the second-stage impeller 240 is connected to one end of the rotating shaft 120 located at the second-stage compression end 113; the compression assembly 30 is provided with a gas flow passage for gas flow, and the compression assembly 30 is connected between the first air foil bearing 150 and the first-stage impeller 220.

[0041] Specifically, the fuel cell air compressor in the application comprises an air compressor body 10, a turbine assembly 20, and a compression assembly 30, the air compressor body 10 is a complete component of the entire fuel cell air compressor, which comprises a shell 110, a rotating shaft 120, a motor stator 130, a radial bearing seat 140, and a first air foil bearing 150 and a second air foil bearing 160 arranged axially opposite to the rotating shaft 120, the shell 110 is used for mounting other components, the bearings connected to the two ends of the rotating shaft 120 in the application adopt the structure of air foil bearings, which have the advantages of large bearing capacity and good stability, and can ensure the stable operation of the air compressor at the highest speed of 120000r / min, therefore the two ends of the rotating shaft 120 are rotatably penetrated through the first air foil bearing 150 and the second air foil bearing 160, the first air foil bearing 150 located at one end is mounted in the radial bearing seat 140, and the second air foil bearing 160 located at the other end is mounted in the groove space formed in the shell 110.

[0042] The turbine assembly 20 is used for pressurizing and compressing air, and comprises a first-stage volute 210, a first-stage impeller 220, a second-stage volute 230, a second-stage impeller 240, and an inter-stage pipe 250, so as to be arranged at two ends of the housing 110 to perform two-stage pressurization, and thus it can be understood that the housing 110 has a first-stage pressurizing end 112 and a second-stage pressurizing end 113, the first-stage pressurizing end 112 is used for mounting and connecting the first-stage volute 210, the first-stage impeller 220 is mounted in the first-stage volute 210 and connected to the rotating shaft 120 at one end of the first-stage pressurizing end 112, and the second-stage pressurizing end 113 is used for mounting and connecting the second-stage volute 230, the second-stage impeller 240 is mounted in the second-stage volute 230 and connected to the rotating shaft 120 at one end of the second-stage pressurizing end 113, and the first-stage volute 210 and the second-stage volute 230 are communicated through the inter-stage pipe 250, and the inter-stage pipe 250 is in the form of surrounding the housing 110.

[0043] Further, the pressurizing assembly 30 is used for providing air source for the air foil bearing to form a dynamic pressure gas film to carry away heat, and thus the pressurizing assembly 30 has an air flow channel for air flow, and the housing 110 has an air outlet 111 for the air carrying away heat to flow out, and thus the pressurizing assembly 30 is arranged between the first air foil bearing 150 and the first-stage impeller 220, so that the high-pressure air generated by the rotation of the first-stage impeller 220 flows to the first air foil bearing 150 through the pressurizing assembly 30.

[0044] As a preferred embodiment of the utility model, the pressurizing assembly 30 comprises a thrust bearing seat 310, a thrust disc 320, and a first air foil thrust bearing 330 and a second air foil thrust bearing 340 arranged in opposite directions along the axial direction, the thrust bearing seat 310 is connected between the radial bearing seat 140 and the first-stage impeller 220, the thrust bearing seat 310 has the air flow channel, and the inner side of the thrust bearing seat 310 is recessed to form a mounting space, the thrust disc 320 has a through hole for the rotating shaft 120 to penetrate, the thrust disc 320, the first air foil thrust bearing 330 and the second air foil thrust bearing 340 are arranged in the mounting space and sleeved on the rotating shaft 120, and the thrust disc 320 is attached to the shaft shoulder of the rotating shaft 120, and the first air foil thrust bearing 330 and the second air foil thrust bearing 340 are respectively connected to the two sides of the thrust disc 320.

[0045] It is to be noted that the thrust bearing seat 310, the thrust disc 320 and the air foil thrust bearings are used to prevent the axial movement of the rotating shaft 120 and bear the axial thrust, since the thrust bearing seat 310 is connected between the radial bearing seat 140 and the primary impeller 220, the air flow channel is arranged on the thrust bearing seat 310 to facilitate the high-pressure gas generated at the primary impeller 220 to flow in; the mounting space recessed on the inner side of the thrust bearing seat 310 is used to mount other components, so that the thrust disc 320, the first air foil thrust bearing 330 and the second air foil thrust bearing 340 are arranged in the mounting space and are mounted by sleeving on the rotating shaft 120, the first air foil thrust bearing 330 is a thrust action in the clockwise direction, bears the axial thrust generated when the rotor rotates clockwise and prevents the axial movement; the second air foil thrust bearing 340 is a thrust action in the counterclockwise direction, bears the axial thrust generated when the rotor rotates counterclockwise and prevents the axial movement, and both cooperate with the thrust disc 320 to bear the axial force.

[0046] As a preferred embodiment of the utility model, the first limiting assembly 170 includes a first bearing check ring 171 and a first positioning pin 172 for limiting the circumferential rotation of the first air foil bearing 150, the first bearing check ring 171 abuts the outer side of the first air foil bearing 150, the first positioning pin 172 extends in the axial direction, and the first positioning pin 172 penetrates the first bearing check ring 171 and extends into the first air foil bearing 150.

[0047] It is to be noted that the first bearing check ring 171 is used to fix the position of the rotating shaft 120 close to the primary compression end 112, avoid the swing and shaking phenomenon caused by unstable position, and cooperate with the first positioning pin 172 to limit the circumferential rotation of the first air foil bearing 150, thereby fixing the first air foil bearing 150, the first bearing check ring 171 abuts the outer side of the first air foil bearing 150 and is connected in the housing 110, where the outer side refers to the side away from the center (towards the primary compression end 112), and after the first positioning pin 172 penetrates the first bearing check ring 171 and extends into the first air foil bearing 150, the circumferential rotation of the first air foil bearing 150 is limited.

[0048] As a preferred embodiment of the utility model, the second limiting assembly 180 includes a second bearing check ring 181 and a second positioning pin 182 for limiting the circumferential rotation of the second air foil bearing 160, the second bearing check ring 181 is abutted on the outside of the second air foil bearing 160, the second positioning pin 182 is arranged in the axial direction, the second positioning pin 182 penetrates the second bearing check ring 181 and extends into the second air foil bearing 160.

[0049] It is worth mentioning that, similar to the first bearing check ring 171, the second bearing check ring 181 is used to fix the position of the rotating shaft 120 close to the secondary compression end 113, avoid the swing and shaking phenomenon caused by unstable position, and cooperate with the second positioning pin 182 to limit the circumferential rotation of the second air foil bearing 160, thereby fixing the second air foil bearing 160, the second bearing check ring 181 is abutted on the outside of the second air foil bearing 160 and connected in the shell 110, here the outside refers to the side away from the center (towards the secondary compression end 113), after the second positioning pin 182 penetrates the second bearing check ring 181 and extends into the second air foil bearing 160, the circumferential rotation of the second air foil bearing 160 is limited.

[0050] As a preferred embodiment of the utility model, the inner side of the thrust bearing seat 310 is convexly formed with a plurality of arc-shaped bosses 311 arranged in the circumferential direction, a ventilation gap 312 is formed between every two adjacent arc-shaped bosses 311, a channel 313 is formed between the arc-shaped boss 311 and the outer periphery of the thrust bearing seat 310, a diagonal through hole 314 is formed in the thrust bearing seat 310, one end of the diagonal through hole 314 extends to the outside of the thrust bearing seat 310, the other end of the diagonal through hole 314 extends to communicate with the channel 313, and a plurality of radial air ducts 315 are arranged in the circumferential direction on the thrust bearing seat 310.

[0051] It is worth noting that the air gap 312 formed between the arc-shaped bosses 311 is used for air flow, and because the arc-shaped bosses 311 are arranged in the recessed mounting space of the thrust bearing seat 310, the arc-shaped bosses 311 are spaced from the outer circumference (i.e. the un-recessed part) of the thrust bearing seat 310 to form a channel 313, which is also used for air flow. The inclined through hole 314 of the thrust bearing seat 310 extends from the outer side to the channel 313 of the inner side, so that the high-pressure gas flow at the first-stage impeller 220 enters the channel 313 from the outer side through the inclined through hole 314, and then the air flow is circulated to carry away heat. The air flow carrying heat flows out from the radial air passages 315 of the thrust bearing seat 310 to the air outlet 111. Therefore, it can be understood that the air gap 312, the channel 313, the inclined through hole 314 and the radial air passage 315 are all part of the air flow passage.

[0052] It is worth mentioning that the inner wall of the housing 110 itself also has an inner wall channel 117 and an inclined channel 118 extending in the axial direction, which are connected to each other to facilitate air flow. For details, please refer to the drawings Figure 9 .

[0053] Further, the radial bearing seat 140 is provided with a plurality of dispersed air holes 141 extending in the axial direction.

[0054] It should be noted that the air holes 141 are used for air flow carrying heat to flow out from the air outlet 111 through the air holes 141.

[0055] Further, it also includes a sealing disc 190, which has a shaft hole for the rotating shaft 120 to penetrate, and the sealing disc 190 is sleeved on the rotating shaft 120 and arranged between the second-stage impeller 240 and the second bearing retainer 181.

[0056] It should be understood that the sealing disc 190 plays a role of axial sealing, but there is a gap between the sealing disc 190 and the inner side (back) of the second-stage impeller 240, so that the high-pressure gas generated by the second-stage impeller 240 flows through the gap to the second air foil bearing 160, and therefore it is arranged between the second-stage impeller 240 and the second bearing retainer 181.

[0057] Further, it also includes a first spacer 316, which is sleeved on the rotating shaft 120 at one end of the first-stage air compression end 112, and the thrust bearing seat 310 is sleeved on the first spacer 316.

[0058] It should be noted that the first spacer sleeve 316 is used to reduce the wear of the rotating shaft 120 at the primary compression end 112, and can also be used to adjust the assembly gap of the thrust bearing seat 310; and the second spacer sleeve 191 is similar to the first spacer sleeve 316, and is used to reduce the wear of the rotating shaft 120 at the secondary compression end 113, and can also be used to adjust the assembly gap of the sealing disc 190.

[0059] Further, the housing 110 has a spiral water channel 114, and the housing 110 is also provided with a water cooling inlet 115 and a water cooling outlet 116, and the two ends of the spiral water channel 114 are respectively communicated with the water cooling inlet 115 and the water cooling outlet 116.

[0060] It can be understood that the spiral water channel 114 is used for cooling water flow, so as to surround the motor stator 130 for cooling, and therefore the housing 110 is also provided with a water cooling inlet 115 and a water cooling outlet 116 for cooling water inflow and outflow.

[0061] For the convenience of those skilled in the art, the several cooling methods in the application are briefly described as follows:

[0062] The first air cooling way: at the primary compression end 112, the high-pressure gas generated by the high-speed rotation of the primary impeller 220 passes through the inclined through hole 314 and the channel 313 of the thrust bearing seat 310, and then flows to the first air foil thrust bearing 330 and the second air foil thrust bearing 340 to provide the dynamic pressure gas film formed thereby with air source, and carries away the heat generated by the relative high-speed rotation between the thrust disc 320 and the first air foil thrust bearing 330 and the second air foil thrust bearing 340, and the high-pressure gas passes through the radial air channel 315 of the thrust bearing seat 310, flows to the air hole 141 on the radial bearing seat 140, and then flows out from the air channel outlet 111.

[0063] The second air cooling way: at the primary compression end 112, the high-pressure gas generated by the high-speed rotation of the primary impeller 220 passes through the inclined through hole 314 of the thrust bearing seat 310, and the high-pressure gas passes through the air gap 312 between the arc-shaped bosses 311 on the thrust bearing seat 310, flows to the first air foil bearing 150 to provide the dynamic pressure gas film formed thereby with air source, and carries away the heat generated by the relative high-speed rotation between the first air foil bearing 150 and the rotating shaft 120, and then flows out from the air channel outlet 111.

[0064] The third air cooling way: the air source is divided into two parts, the first part is generated by the high-speed rotation of the first-stage impeller 220 of the first-stage air compression end 112, the high-pressure air passes through the inclined through hole 314 on the thrust bearing seat 310, the air gap 312 between the arc bosses 311 on the thrust bearing seat 310, the air hole 141 of the radial bearing seat 140, the inner wall channel 117 and the inclined channel 118 of the shell 110, and flows to the first air foil bearing; the second part is generated by the high-speed rotation of the second-stage impeller 240 of the second-stage air compression end 113, the high-pressure air flows to the second air foil bearing 160 along the gap between the back of the second-stage impeller 240 and the sealing disc 190; the two parts of air provide air source for the air foil bearings to form dynamic pressure air film, and take away the heat generated by the relative high-speed rotation between the two air foil bearings and the rotating shaft 120, cool the motor stator 130 through the gap between the rotating shaft 120 and the motor stator 130, and finally flow out from the air outlet 111.

[0065] Water channel cooling: the cooling water is connected through the water cooling inlet 115 outside the shell 110, the motor stator 130 is cooled by the spiral water channel 114 of the shell 110 wall, and then the cooling water flows out through the water cooling outlet 116, so that the water cooling circulation is realized; in this way, the air compressor is further improved in service life by the air cooling and water cooling, the overall structure of the air compressor is more simple and compact, and the efficiency is higher.

[0066] The above is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process transformation by using the content of the utility model specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection range of the utility model.

Claims

1. A fuel cell air compressor characterized by comprising: The air compressor comprises an air compressor body, a turbine assembly and a compression assembly. The air compressor body comprises a shell, a rotating shaft, a motor stator, a radial bearing seat and a first air foil bearing and a second air foil bearing arranged in an axial direction, the turbine assembly comprises a first stage volute, a first stage impeller, a second stage volute, a second stage impeller and an inter-stage pipeline. The shell is provided with an air passage outlet, the shell comprises a first stage compression end and a second stage compression end, the first stage volute is connected to the first stage compression end, the second stage volute is connected to the second stage compression end, and the two ends of the inter-stage pipeline are in communication with the first stage volute and the second stage volute respectively. The rotating shaft penetrates the motor stator, and the two ends of the rotating shaft are rotatably penetrated by the first air foil bearing and the second air foil bearing respectively, the radial bearing seat is connected to the first stage compression end, the first air foil bearing is connected in the radial bearing seat, the first stage impeller is connected to one end of the rotating shaft at the first stage compression end, and the second stage impeller is connected to one end of the rotating shaft at the second stage compression end. The compression assembly is provided with an air flow channel for air flow, and the compression assembly is connected between the first air foil bearing and the first stage impeller.

2. The fuel cell air compressor of claim 1, wherein, The compression assembly comprises a thrust bearing seat, a thrust disc and a first air foil thrust bearing and a second air foil thrust bearing arranged in an axial direction, the thrust bearing seat is connected between the radial bearing seat and the first stage impeller, the thrust bearing seat is provided with the air flow channel, and the inner side of the thrust bearing seat is recessed to form a mounting space, the thrust disc is provided with a through hole for the rotating shaft to penetrate, the thrust disc, the first air foil thrust bearing and the second air foil thrust bearing are arranged in the mounting space and are sleeved on the rotating shaft, and the thrust disc is attached to the shaft shoulder of the rotating shaft, and the first air foil thrust bearing and the second air foil thrust bearing are connected to the two sides of the thrust disc respectively.

3. The fuel cell air compressor of claim 1, wherein, The first limiting assembly comprises a first bearing check ring and a first positioning pin for limiting the rotation of the first air foil bearing in the circumferential direction, the first bearing check ring abuts the outer side of the first air foil bearing, and the first positioning pin extends in the axial direction, the first positioning pin penetrates the first bearing check ring and extends into the first air foil bearing.

4. The fuel cell air compressor of claim 1, wherein, The second limiting assembly comprises a second bearing check ring and a second positioning pin for limiting the rotation of the second air foil bearing in the circumferential direction, the second bearing check ring abuts the outer side of the second air foil bearing, and the second positioning pin extends in the axial direction, the second positioning pin penetrates the second bearing check ring and extends into the second air foil bearing.

5. The fuel cell air compressor of claim 2, wherein, The inner side of the thrust bearing seat is convexly formed with a plurality of arc-shaped bosses arranged along the circumferential direction of the thrust bearing seat, a ventilation gap is formed between each two adjacent arc-shaped bosses, a channel is formed between the arc-shaped bosses and the outer periphery of the thrust bearing seat, a slanting through hole is formed in the thrust bearing seat, one end of the slanting through hole extends to the outer side of the thrust bearing seat, the other end of the slanting through hole extends to the channel, and a plurality of radial air passages are arranged along the circumferential direction of the thrust bearing seat.

6. The fuel cell air compressor of claim 5, wherein, A plurality of ventilation holes are formed in the radial bearing seat and arranged in a dispersed manner, and the ventilation holes are arranged in an axial direction.

7. The fuel cell air compressor of claim 4, wherein, A sealing disc is further included, the sealing disc has a shaft hole for the shaft to penetrate, the sealing disc is sleeved on the shaft and arranged between the second-stage impeller and the second bearing retainer.

8. The fuel cell air compressor of claim 2, wherein, A first spacer sleeve is further included, the first spacer sleeve is sleeved on the shaft at one end of the primary compression end, and the thrust bearing seat is sleeved on the first spacer sleeve.

9. The fuel cell air compressor of claim 7, wherein, A second spacer sleeve is further included, the second spacer sleeve is sleeved on the shaft at one end of the secondary compression end, and the sealing disc is sleeved on the second spacer sleeve.

10. The fuel cell air compressor of claim 1, wherein, The shell has a spiral water channel, a water cooling inlet and a water cooling outlet are formed in the shell, and the two ends of the spiral water channel are in communication with the water cooling inlet and the water cooling outlet, respectively.

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