CN216111337U - High-speed air suspension compressor for fuel cell, fuel cell system and vehicle - Google Patents

Abstract

A high-speed air suspension compressor for a fuel cell, a fuel cell system and a vehicle belong to the technical field of hydrogen fuel cell electrically-driven air compressors. The problem of current compressor rotational speed hang down and cooling effect is poor is solved. The key points are as follows: the motor stator is a closed stator, and the two sides of the motor stator adopt resin or metal caps to close end coils; the cooling sleeve is in interference fit between the outer wall of the motor stator and the inner wall of the motor shell, and the cooling channel is communicated with the cooling liquid inlet and the cooling liquid outlet; the thrust disc is arranged in the middle of the air suspension thrust bearing assembly and fixed on the motor rotor at the rear side of the impeller, and the steam seal body is arranged at the outer edge of the back plate of the impeller; the cooling fan is fixed at the rear end of the rotor, and the rotor drives the cooling fan to send air into the inner cavity of the motor stator and discharge the air from the exhaust port. The cooling liquid flows through the cooling channel to take away the heat of the stator, the rotor is cooled by adopting air to flow through the gap between the stator and the rotor, and the two cooling modes are matched to ensure the normal operation of the motor under extreme conditions.

Description

High-speed air suspension compressor for fuel cell, fuel cell system and vehicle

Technical Field

The utility model relates to a compressor for a fuel cell, a fuel cell system and a vehicle, in particular to a high-speed air suspension compressor for the fuel cell, the fuel cell system and the vehicle, and belongs to the technical field of electrically driven air compressors of hydrogen fuel cells.

Background

In the aspect of new energy, the automobile powered by the hydrogen fuel cell has high power performance, quick hydrogenation and long endurance, and is the most strategic breakthrough of the new energy automobile in the 21 st century. The hydrogen fuel cell directly outputs electric energy through chemical reaction of hydrogen and oxygen, the power density of the hydrogen fuel cell is directly related to the air supply pressure and the air supply flow of the air supply system, the air supply pressure is high, the oxygen partial pressure is high, the reaction speed of the fuel cell is accelerated, and the output power is increased.

In the application of the fuel cell stack, an air compressor is used for outputting compressed air to the stack to generate electricity through hydrogen-oxygen reaction. In the prior art, the common technical scheme is that the motor stator is cooled by air, so that the cooling effect is not ideal; or the liquid is adopted to cool the motor stator, and a cooling channel is arranged on the inner side of the motor shell to cool the motor shell, so that the effect of cooling the motor stator is achieved. In the prior art, air cooling is used for cooling a rotor, liquid cooling is used for cooling a stator, but the structural design is different, a compressor volute is used for extracting air to cool the rotor, the temperature of the compressed air is higher, the cooling effect is poor, the extraction temperature is high, the temperature is continuously increased after the compressor volute is used for cooling an air bearing, the compressor volute is continuously used for cooling the motor rotor, and the generated cooling capacity is obviously insufficient; the cooling effect is not obvious because the cooling channel needs to be close to the motor stator as much as possible and the cooling channel needs to be enough to cool the coils on the two sides of the motor stator; if the cooling air quantity is increased, power consumption is caused, and meanwhile, the heat accumulation of the external environment of the air compressor is caused by the discharge of a large amount of heated air.

The air compressor is applied to the fuel cell, and due to the size and weight requirements of automobile parts, the design of the air compressor is to improve the energy density to the maximum extent and reduce the volume and weight of the air compressor, so that the motor is compact in design, high in rotating speed (more than 10 ten thousand revolutions per minute), high in wind loss of a gap between a stator and a rotor (proportional to the rotating speed), and hidden danger of overheating of the motor is brought; the conventional water cooling is generally adopted to cool the stator of the motor, and a cooling channel is arranged on the motor shell to take away the heat of the stator through metal heat transfer.

In the prior art 1, the publication number is CN 213953927U, the publication date is 2021.08.13, and in the patent of the utility model named as the centrifugal compressor, viewed from the air cooling flow channel, the design has a compressed air source outside, which flows perpendicularly to the circumferential surface of the thrust disc outer diameter of the thrust bearing, and when the thrust disc rotates at high speed, the air flow perpendicularly rushes to the circumferential surface of the thrust disc outer diameter, which brings unstable factors to the working state of the thrust bearing, and simultaneously, on the basis of the axial thrust generated by the single-side impeller, the action of the unidirectional axial thrust is increased or deteriorated, which discloses two-stage compression and single-stage compression in the patent specification, two-stage compression of the impeller exists on both sides, the thrust of the left and right bearings is mutually offset, one-side impeller is simply removed, the design is changed into single-stage compression, but the disadvantage of the increase of the axial thrust brought by the change is not considered, and there are very large unstable factors in the operation of the air foil bearing, the hidden trouble that the internal structure of the motor is damaged due to the fact that the thrust bearing is burnt out by abrasion exists. In addition, in the single-stage design of the patent, the air inlet position is close to the back plate of the impeller and is close to the position of the thrust disc, the temperature of the position is high, after the air flow enters, a part of the air flow is heated and simultaneously flows through the rotor from the impeller side all the way to the rear of the motor far away from the impeller to continuously cool the radial air bearing, then enters the channel of the outer shell of the motor at the tail end and is discharged after being cooled.

Prior art 2, the notice number is CN 213717784U, and the notice date is 2021.07.16, and the utility model discloses an in the patent of the centrifugal permanent-magnet machine of two-stage air suspension direct drive cooling system of air compressor machine, put the liquid cooling channel of stator in the outside of motor casing, the middle passageway that still adds cooling air (discharge after the air cooling of retrieving), cause the cooling capacity to stator and stator coil seriously not enough: the cooling of the stator is the most important design of the high-speed motor, the design is not divided primarily and secondarily, the motor cannot run for a long time, particularly, the external environment temperature is high, when the conditions are severe, the hidden danger is great, and the service life of the motor is obviously influenced.

In summary, the cooling method and structure of the compressor need to be improved to overcome the problems of low rotation speed and non-ideal cooling effect of the compressor in the prior art.

It is noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of the above circumstances, an object of the present invention is to provide a high-speed air levitation compressor for a fuel cell, a fuel cell system, and a vehicle, which solve the problems of the conventional compressor that the rotation speed is low and the cooling effect is poor.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the first scheme is as follows: a high-speed air suspension compressor for a fuel cell, comprising:

the cooling device comprises a motor shell, a cooling liquid inlet and a cooling liquid outlet are formed in the motor shell, and an air outlet is formed in the front end of the motor shell;

the motor stator and the motor rotor are arranged in the motor shell, the motor rotor is inserted into an inner cavity of the motor stator to rotate freely, the front end and the rear end of the motor rotor are connected with the motor shell through air suspension bearing assemblies, the motor stator is a closed stator, and end coils are closed on two sides of the motor stator by adopting resin or metal caps;

the cooling sleeve is arranged between the outer wall of the motor stator and the inner wall of the motor shell in an interference fit manner, a cooling channel is processed on the outer wall of the cooling sleeve, and the cooling channel is communicated with a cooling liquid inlet and a cooling liquid outlet;

the impeller is arranged in the volute, the root of the impeller is tightly buckled with the thrust disc, and the impeller is fixed at the front end of the motor rotor;

the steam seal body is arranged at the outer edge of the back plate of the impeller;

and the cooling fan is fixed at the rear end of the motor rotor, and the motor rotor drives the cooling fan to send wind into the inner cavity of the motor stator and discharge the wind from the air outlet.

Combine scheme one, in certain implementation of scheme one, the air suspension bearing subassembly includes front bearing seat, back air suspension journal bearing, preceding air suspension journal bearing, front bearing seat, back bearing seat seal installation are at motor housing's front and back end, the motor rotor front end is connected with the front bearing seat through preceding air suspension journal bearing, and the motor rotor rear end is connected with the back bearing seat through back air suspension journal bearing, has seted up air passage on the back bearing seat, and cooling fan passes through air passage and sends into motor stator inner chamber with wind.

With reference to the first aspect, in some implementations of the first aspect, the high-speed air suspension compressor for a fuel cell further includes a motor rear cover, and the cooling fan is enclosed in the rear bearing seat through the motor rear cover.

In some implementations, in combination with the first aspect, the cooling fan is fixed to the rear end of the motor rotor by a post-tensioning bolt.

In combination with the first scheme, in some implementations of the first scheme, the air suspension thrust bearing assembly includes a thrust bearing seat, an outer thrust bearing, and an inner thrust bearing, the thrust bearing seat is connected with the front bearing seat, the outer thrust bearing, the thrust disc, and the inner thrust bearing are sequentially arranged between the thrust bearing seat and the front bearing seat from front to back, and the gland casing is arranged between the impeller and the thrust bearing seat; the impeller, the thrust disc and the motor rotor are coaxially connected through the front tensioning bolt, and compressed air flows through the gland casing to cool the thrust bearing.

Further: the cooling liquid is other liquids such as glycol, mixed liquid of glycol and water, deionized water, oil and the like. The cooling liquid of the vehicle can be directly used as the cooling medium of the motor in the scheme, additional equipment does not need to be added, and the weight and the size of the device are further reduced.

Further: the cooling channel is a spiral cooling channel.

Further: the air outlet is a plurality of air outlets which are uniformly arranged along the circumferential direction of the motor shell.

Further: the two air outlets are arranged on the motor shell up and down.

Further: the number of the air outlets is four, and the air outlets are arranged on the motor shell at intervals of 90 degrees.

Further: twelve air outlet openings are formed, and the air outlet openings are arranged on the motor shell at intervals of 30 degrees.

The air outlet is arranged in various forms, so that automobile manufacturers can select the air outlet conveniently, or the air outlet can be adjusted properly according to the requirements of the automobile manufacturers, and the exhausted air pipeline is communicated with an automobile exhaust pipeline.

Scheme II: according to another aspect of the present invention, there is also provided a fuel cell system comprising the high-speed air suspension compressor of the first aspect.

The third scheme is as follows: according to still another aspect of the present invention, there is provided a vehicle including the high-speed air levitation compressor of the first aspect or the fuel cell system of the second aspect.

The utility model achieves the following effects:

1. the cooling liquid (glycol, mixed liquid of glycol and water, oil and other liquid) flows through the cooling channel to take away the heat of the stator, the rotor is cooled by air flowing through the gap between the stator and the rotor, the two cooling modes are matched for use, the effect is obvious, and the normal operation of the motor under extreme conditions is better ensured.

2. In order to ensure that enough cooling air flows through the air bearing and the gap between the rotor and the stator, a steam seal body on the back of the impeller is designed, so that part of compressed air leaks into the motor; meanwhile, a coaxial cooling fan is designed on the side far away from the impeller, and air sucked from the outside flows through the gap between the whole stator and the rotor, so that the effect of cooling the radial bearing and the motor rotor on the side far away from the impeller is achieved.

3. The novel stator is adopted, resin or metal caps are added on two sides of the stator to seal, the coil is sealed, then the whole external surface of the stator is cooled, the length of a cooling channel is greatly improved, specifically, the closed stator is adopted in the embodiment, the cooling channel is long, the closed stator is applied to the field of fuel cells and is the first creation of the utility model, the stator structure in the prior art is only in interference fit with a shell or a shaft sleeve in the middle part (silicon steel sheet), physical contact is realized, the integral physical contact is realized, the long cooling channel is realized, and the cooling effect is good.

4. The utility model has high rotating speed (15 ten thousand revolutions per minute), and can realize the compression ratio of 1: 3.

5. the compressor of the utility model has small size, high rotating speed and high energy density, is only one third or one half of the size of the prior art 1, and has half or less weight.

Drawings

Fig. 1 is an assembly view of a high-speed air levitation compressor for a fuel cell of example 1;

fig. 2 is an assembly view of a high-speed air levitation compressor for a fuel cell of example 2;

FIG. 3 is a schematic flow diagram of the cooling medium of the high-speed air suspension compressor for a fuel cell of the present invention;

FIG. 4-1 is a 16kw fuel cell air compressor temperature profile (3D phantom) plot for an inlet mass flow rate of 13 g/s;

FIG. 4-2 is a graph of 16kw fuel cell air compressor temperature profile (3D phantom) at an inlet mass flow rate of 8 g/s;

FIG. 5-1 is a 16kw fuel cell air compressor fluid (ethylene glycol + water, air) pressure profile with an inlet mass flow rate of 13 g/s;

FIG. 5-2 is a 16kw fuel cell air compressor fluid (ethylene glycol + water, air) pressure profile with an inlet mass flow rate of 8 g/s;

FIG. 6-1 is a 16kw fuel cell air compressor fluid (ethylene glycol + water, air) temperature profile with an inlet mass flow rate of 13 g/s;

FIG. 6-2 is a 16kw fuel cell air compressor fluid (ethylene glycol + water, air) temperature profile at an inlet mass flow rate of 8 g/s.

In the figure: 1-rear bearing seat; 2-a motor support; 3-rear air suspension radial bearing; 4-a motor housing; 5-a motor stator; 6-a motor rotor; 7-air outlet; 8-front bearing seat; 9-a volute; 10-an impeller; 11-an air inlet; 12-front tension bolts; 13-a thrust disc; 14-an inner thrust bearing; 15-a gland sealing body; 16-a compressed air flow channel; 17-front air-suspended radial bearing; 18-a coolant inlet; 19-a cooling jacket; 20-coolant outlet; 21-motor rear cover; 22-post tensioning bolts; 23-a cooling fan; 24-a bearing seat; 25-external thrust bearing.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Preferred embodiments of the present invention are explained in detail below with reference to the accompanying drawings.

Example 1: referring to fig. 1, a high-speed air levitation compressor for a fuel cell of the present embodiment includes: the device comprises a rear bearing seat 1, a motor support 2, a rear air suspension radial bearing 3, a motor shell 4, a motor stator 5, a motor rotor 6, a front bearing seat 8, a volute 9, an impeller 10, a front tensioning bolt 12, a thrust disc 13, an inner thrust bearing 14, a gland casing 15, a front air suspension radial bearing 17, a cooling sleeve 19, a motor rear cover 21, a rear tensioning bolt 22, a cooling fan 23, a bearing seat 24 and an outer thrust bearing 25;

the motor shell 4 is arranged on the motor support 2, a cooling liquid inlet 18 and a cooling liquid outlet 20 are arranged on the motor shell 4, pipe joints are arranged on the cooling liquid inlet 18 and the cooling liquid outlet 20, and an upper air outlet and a lower air outlet 7 are processed at the front end of the motor shell 4;

the motor stator 5 is a closed stator, the two sides of the motor stator adopt resin or metal cap closed end coils, the motor stator 5 and the motor rotor 6 are arranged in the motor shell 4, the motor rotor 6 is inserted in the inner cavity of the motor stator 5 to rotate freely, the front bearing seat 8 and the rear bearing seat 1 are hermetically arranged at the front end and the rear end of the motor shell 4, the front end of the motor rotor 6 is connected with the front bearing seat 8 through a front air suspension radial bearing 17, the rear end of the motor rotor 6 is connected with the rear bearing seat 1 through a rear air suspension radial bearing 3, the annular array on the rear bearing seat 1 is provided with air channels 1-1, the cooling fan 23 is fixed at the rear end of the motor rotor 6 through a rear tensioning bolt 22 and is encapsulated in the rear bearing seat 1 (the rear bearing seat 1 is processed with a fan installation space) through a motor rear cover 21, the motor rotor 6 drives the cooling fan 23 to send air into the inner cavity of the motor stator 5 through the air channels 1-1, and discharged from the air outlet 7;

the cooling sleeve 19 is arranged between the outer wall of the motor stator 5 and the inner wall of the motor shell 4 in an interference fit manner, and a spiral cooling channel 19-1 is processed on the outer wall of the cooling sleeve 19 and is communicated with a cooling liquid inlet 18 and a cooling liquid outlet 20; the impeller 10 is arranged in the volute 9 and is connected with the front end of the motor rotor 6 in a rotating coupling mode, the front end of the volute 9 is an air inlet 11, and a compressed air flow channel 16 is arranged inside the volute; the thrust bearing seat 24 is connected with the front bearing seat 8, an outer thrust bearing 25, a thrust disc 13 and an inner thrust bearing 14 are sequentially arranged between the thrust bearing seat 24 and the front bearing seat 8 from front to back, and a gland sealing body 15 is arranged between the impeller 10 and the thrust bearing seat 24; the impeller 10, the thrust disc 13 and the motor rotor 6 are coaxially connected through a front tensioning bolt 12, compressed air flows through a gland sealing body 15 to cool a thrust bearing, and the cooling liquid is ethylene glycol.

Compared with the prior art 1, the novel stator is adopted, the two sides of the stator are sealed by adding resin or metal caps, the coil is sealed, then the whole external surface of the stator is cooled, the length of a cooling channel is greatly improved, specifically, the sealed stator is adopted in the embodiment, the cooling channel is long, the sealed stator is applied to the field of fuel cells and is the first creation of the utility model, the stator structure in the prior art is only in interference fit with a shell or a shaft sleeve at the middle part (silicon steel sheet), physical contact is realized, the whole physical contact is realized, the long cooling channel is realized, and the cooling effect is good. Due to two-stage compression, the structure is complex, and the design of a cooling channel is complex; to realize high compression ratio, only two-stage compression is needed without increasing the rotating speed; the rotating speed of the embodiment is high (15 ten thousand revolutions per minute), and the pressure ratio of 1: 3, the compressor has small size, high rotating speed, high energy density, one third or one half of the size of the prior art 1 and half or less of weight due to the change of the cooling path and the structure. The motor stator of this embodiment adopts the liquid to flow through cooling channel and takes away the heat of stator, and the rotor adopts the clearance of air current between stator and the rotor to cool off, and two kinds of cooling methods cooperate the use, and the effect is obvious, better assurance motor normal operating under extreme condition. In order to ensure that enough cooling air flows through the air bearing and the gap between the rotor and the stator, a steam seal body on the back of the impeller is also designed, so that part of compressed air leaks into the motor; meanwhile, a coaxial cooling fan is designed on the side far away from the impeller, and air sucked from the outside flows through the gap between the whole stator and the rotor, so that the effect of cooling the radial bearing and the motor rotor on the side far away from the impeller is achieved. An air suspension thrust bearing is arranged at the rear side of the impeller, air suspension radial bearings are respectively arranged at the left side and the right side of the motor, a coaxial cooling fan far away from the impeller side, a steam seal body behind the impeller, the air cooling flow direction, the air leakage quantity at the impeller side flows into the motor, a rear cover is far away from the impeller side, the cooling fan sucks air, the air flows into the motor, and the two air flows are converged and then discharged out of the motor; the liquid cooling channel extends to two sides as much as possible, and the cooling area is increased.

Example 2: referring to fig. 2, the present embodiment is different from embodiment 1 in that twelve air discharge ports 7 are provided on the motor case 4 at 30-degree intervals.

Example 3: the difference from the above example 1 or 2 is that the cooling liquid is a mixed liquid of ethylene glycol and water.

Example 4: the difference from the above-described embodiment 1 or 2 is that the cooling liquid is oil.

Example 5: this embodiment also provides a fuel cell system comprising the high-speed air levitation compressor of any of embodiments 1-4.

Example 6: in yet another aspect of this embodiment, a vehicle is provided that includes the high-speed aero-levitation compressor of any one of embodiments 1-4 or the fuel cell system of embodiment 5.

The cooling simulation test of the utility model is as follows:

1. the material properties of the motor are as follows:

table 1: motor material attribute table

Simulation used 1.5 times of the normal power consumption of the Bearing (1.5 × Bearing losses are associated)

2. Input conditions for the cooling flow (liquid cooling and gas cooling) calculated by simulation:

mixed fluid of ethylene glycol (ethylene glycol) and water: turbulent flow

The density @20 ℃ is 1,087kg/m³

Thermal conductivity of 0.37W/mK

Specific heat capacity of 3,285J/kg.K

Dynamic viscosity 0.0038 pas

Inlet mass flow rate of 100g/s

Inlet static temperature of 45 DEG C

Outlet conditions Standard atmospheric pressure (101,325Pa)

Air fluid leaking from the back of the compressor wheel:

inlet mass flow rate of 2.5g/s

Inlet static temperature 140 deg.C

The air flow sucked by the cooling fan far from the impeller end (calculated in two cases as the flow rate):

inlet mass flow rate 13g/s (case 1); 8g/s (case 2)

Inlet static temperature of 45 DEG C

Rotation speed of rotor 150,000rpm

3. Results data and images:

TABLE 2 temperature averaged by volume (case 1 and case 2) (. degree.C.)

The simulated calculated temperature distribution of the 3D solid part is shown in fig. 4-1, fig. 4-2, the simulated calculated pressure distribution of the cooling fluid (glycol + water, air) is shown in fig. 5-1, fig. 5-2, and the simulated calculated temperature distribution of the cooling fluid (glycol + water, air) is shown in fig. 6-1, fig. 6-2.

Summary of simulation calculation results:

under the condition that the power consumption of a normal air bearing is 1.5 times (simulating severe working conditions), a high-speed motor internal thermodynamic model of simulation calculation is as follows: through setting input condition modeling, under the condition that the air suspension radial bearing and the thrust air suspension bearing generate 150% of heat under normal working conditions (the bearing power consumption is the generated heat which can be regarded as extremely severe working conditions), the normal power output (12-16kw) of the motor and the normal working rotating speed (120,000-150,000rpm) of the rotor are kept, and the simulation calculation result verifies the temperature and the pressure of the fluid in the liquid cooling and air cooling channels, so that the good control of the internal temperature of the motor is realized, the cooling requirement of the motor is met, and the normal work of the motor is ensured. Under the condition that the liquid cooling condition of the motor is kept unchanged and the cooling air flow leaked from a steam seal at the back end of the impeller is not changed, the temperature distribution of a 3D entity part is calculated by simulation calculation under the condition that a cooling fan far away from the end of the impeller (the right end of the motor shown in the figure) provides 13g/s and 8g/s of cooling air flow, and compared with the calculation results and the temperature distribution diagrams of cases 1 and 2, it can be seen that due to the fact that the closed stator is adopted to prolong the liquid cooling channel and improve the heat dissipation capacity of the end part of the stator, most of heat is taken away by the liquid cooling channel, the heat dissipation pressure of the air cooling channel is effectively relieved, so that the design can keep very low temperature distribution in the whole motor under the condition that the cooling fan only provides 8g/s, the temperature of a main shaft and a permanent magnet of the motor is low, and the working efficiency and the service life of the motor can be ensured, is one of the most central indicators for measuring the cooling effect. The air suspension thrust bearing and the radial bearing (impeller side) have the inlet temperature of 140 ℃ due to the obtained cooling air from the leakage air of a steam seal, the temperature is increased to 235 ℃ after the air bearing with 1.5 times of power consumption is cooled, the bearing has the capability of bearing the high temperature below 400 ℃, and the simulation calculation result shows that the bearing can also bear a more severe working environment, and even under the normal power consumption of 1.5 times, a large safety margin is left at the upper temperature limit of the bearing.

The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. A high-speed air-suspension compressor for a fuel cell, comprising:

the motor comprises a motor shell (4), wherein a cooling liquid inlet (18) and a cooling liquid outlet (20) are formed in the motor shell (4), and an air outlet (7) is formed in the front end of the motor shell (4);

the motor comprises a motor stator (5) and a motor rotor (6) which are arranged in a motor shell (4), wherein the motor rotor (6) is inserted into an inner cavity of the motor stator (5) to rotate freely, the front end and the rear end of the motor rotor (6) are connected with the motor shell (4) through air suspension bearing assemblies, the motor stator (5) is a closed stator, and end coils are closed on the two sides of the motor stator by adopting resin or metal caps;

the cooling sleeve (19) is arranged between the outer wall of the motor stator (5) and the inner wall of the motor shell (4) in an interference fit manner, a cooling channel (19-1) is processed on the outer wall of the cooling sleeve (19), and the cooling channel (19-1) is communicated with a cooling liquid inlet (18) and a cooling liquid outlet (20);

the impeller (10) is arranged in the volute (9), the root of the impeller (10) is tightly buckled with the thrust disc (13), and the impeller (10) is fixed at the front end of the motor rotor (6);

the air suspension thrust bearing assembly comprises a steam seal body (15) and a thrust disc (13), wherein the thrust disc (13) is arranged in the middle of the air suspension thrust bearing assembly and fixed on a motor rotor (6) on the rear side of an impeller (10), and the steam seal body (15) is arranged on the outer edge of a back plate of the impeller (10);

and the cooling fan (23) is fixed at the rear end of the motor rotor (6), the motor rotor (6) drives the cooling fan (23) to send wind into the inner cavity of the motor stator (5) and the wind is discharged from the air outlet (7).

2. The high-speed air levitation compressor for fuel cell according to claim 1, characterized in that: the air suspension bearing assembly comprises a front bearing seat (8), a rear bearing seat (1), a rear air suspension radial bearing (3) and a front air suspension radial bearing (17), the front bearing seat (8) and the rear bearing seat (1) are hermetically installed at the front end and the rear end of a motor shell (4), the front end of a motor rotor (6) is connected with the front bearing seat (8) through the front air suspension radial bearing (17), the rear end of the motor rotor (6) is connected with the rear bearing seat (1) through the rear air suspension radial bearing (3), an air channel (1-1) is formed in the rear bearing seat (1), and a cooling fan (23) sends wind into an inner cavity of a motor stator (5) through the air channel (1-1).

3. The high-speed air levitation compressor for fuel cell according to claim 2, wherein: the motor rear bearing seat further comprises a motor rear cover (21), and the cooling fan (23) is packaged in the rear bearing seat (1) through the motor rear cover (21).

4. A high-speed air levitation compressor for a fuel cell according to claim 1, 2 or 3, characterized in that: the cooling fan (23) is fixed at the rear end of the motor rotor (6) through a rear tensioning bolt (22).

5. A high-speed air levitation compressor for a fuel cell according to claim 1, 2 or 3, characterized in that: the air suspension thrust bearing assembly comprises a thrust bearing seat (24), an outer thrust bearing (25) and an inner thrust bearing (14), wherein the thrust bearing seat (24) is connected with a front bearing seat (8), the outer thrust bearing (25), a thrust disc (13) and the inner thrust bearing (14) are sequentially arranged between the thrust bearing seat (24) and the front bearing seat (8) from front to back, and a steam seal body (15) is arranged between the impeller (10) and the thrust bearing seat (24); the impeller (10), the thrust disc (13) and the motor rotor (6) are coaxially connected through a front tensioning bolt (12), and compressed air flows through the gland sealing body (15) to cool the thrust bearing.

6. The high-speed air levitation compressor for fuel cell according to claim 5, wherein: the cooling liquid is glycol, the mixed liquid of glycol and water, deionized water or oil.

7. The high-speed air levitation compressor for fuel cell according to claim 4, wherein: the cooling channel (19-1) is a spiral cooling channel.

8. The high-speed air levitation compressor for fuel cell according to claim 7, wherein: the air outlets (7) are uniformly arranged along the circumferential direction of the motor shell (4);

or the number of the air outlets (7) is two, and the air outlets are arranged on the motor shell (4) up and down;

or the number of the air outlet openings (7) is four, and the air outlet openings are arranged on the motor shell (4) at intervals of 90 degrees;

or the number of the air outlet openings (7) is twelve, and the air outlet openings are arranged on the motor shell (4) at intervals of 30 degrees.

9. A fuel cell system characterized by: comprising a high-speed air suspension compressor for a fuel cell according to any one of claims 1 to 8.

10. A vehicle, characterized in that: comprising a high-speed air suspension compressor for a fuel cell according to any one of claims 1 to 8 or a fuel cell system according to claim 9.

Images