CN217814027U - Air cycle machine - Google Patents

Abstract

The utility model provides an air cycle machine, which comprises an expander part, a compressor part, a fan part, a main shaft and a radial shaft, wherein one end of a first air-entraining pipeline can introduce gas from an expansion cavity of the expander part, the other end of the first air-entraining pipeline is communicated with one end of an air inlet channel, the other end of the air inlet channel is communicated with a first bearing cavity, and a cooling channel is arranged inside the main shaft; the first sealing structure is in abutting connection with the axial side end face of the fan base, the first sealing structure is of an annular structure and comprises at least 2 sealing teeth which are located on the radial inner periphery of the first sealing structure and are arranged at intervals along the axial direction, each sealing tooth comprises a tooth clearance surface, a tooth straight surface and a tooth inclined surface, and the tooth straight surface is arranged close to the first bearing cavity relative to the tooth inclined surface. The utility model discloses can take away high-speed bearing friction heat effectively, improve high-speed rotatory rotor system's stability, can also provide more gas resistance than the tooth inclined plane to the gas flow direction through the straight face of tooth to can improve seal structure's sealed effect.

Description

Air cycle machine

Technical Field

The utility model relates to an air cycle machine technical field, concretely relates to air cycle machine.

Background

An air cycle machine for a compressed air cycle refrigeration system has a rotor supported for high speed rotation by pneumatic bearings. The air friction heat between the bearing and the rotor needs to be removed in time, otherwise, after the heat is accumulated to a certain degree, the bearing is burnt out, and the air cycle machine cannot work normally. In order to timely remove heat, the gas in the ACM is adopted to cool the bearing, and how to orderly control the flow of cooling air flow is a technical problem which needs to be solved.

In order to ensure that the air flow for cooling the bearing is in an orderly and controllable state, the cavity for accommodating the bearing has certain sealing performance, and the cavity for accommodating the bearing is formed by combining a static part and a high-speed rotating part, so that the technical problem of air flow sealing between the moving part and the static part of the high-speed rotor needs to be solved.

Because air cycle machine among the prior art exists can't also improve the sealed effect to cooling gas when dispelling the heat the refrigerated to the bearing, guarantees technical problem such as effectively sealed, consequently the utility model discloses research and design an air cycle machine.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the air cycle machine among the prior art and having and can also improve the sealed effect to the cooling gas when carrying out the heat dissipation refrigerated to the bearing, guarantee effective sealed defect to an air cycle machine is provided.

In order to solve the above problem, the present invention provides an air cycle machine, which includes:

the main shaft penetrates through the expander part, the compressor part and the fan part; the air cycle machine further comprises a first radial bearing, a second radial bearing, a first thrust bearing, a second thrust bearing, a first bleed air pipeline and an air inlet channel, the main shaft is supported by the first radial bearing, the second radial bearing, the first thrust bearing and the second thrust bearing, and the first radial bearing, the first thrust bearing and the second thrust bearing are all arranged in the first bearing cavity; the second radial bearing and the first radial bearing are arranged at intervals along the axial direction of the main shaft, and the second radial bearing is arranged in a second bearing cavity;

one end of the first air leading pipeline can lead gas into an expansion cavity of the expander part, the other end of the first air leading pipeline is communicated with one end of the air inlet channel, and the other end of the air inlet channel is communicated with the first bearing cavity and used for conveying cooling air for cooling the first radial bearing, the first thrust bearing and the second thrust bearing; a cooling channel is arranged in the main shaft, and can conduct the gas in the first bearing cavity to the second bearing cavity for conveying cooling air for cooling the second radial bearing;

the air cycle machine comprises a fan base, a first sealing structure and a second sealing structure, wherein the second bearing cavity is arranged on the radial inner side of the fan base, the first sealing structure is abutted against the end face of one axial side of the fan base, and the second sealing structure is abutted against the end face of the other axial side of the fan base;

first seal structure is ring structure, including being located its radial inner periphery and along 2 at least sealed teeth that axial interval set up, sealed tooth includes tooth clearance face, the straight face of tooth and tooth inclined plane, and two are adjacent form first sealed chamber between the sealed tooth, the tank bottom in first sealed chamber forms the tooth bottom surface, tooth clearance face is for being located the terminal surface of the radial inboard of sealed tooth, along the axial of first seal structure, the straight face of tooth is for being located the terminal surface of the axial one side of sealed tooth, the tooth inclined plane is for being located the terminal surface of the axial opposite side of sealed tooth, the straight face of tooth extends along the radial direction of first seal structure, the tooth inclined plane along with the radial direction of first seal structure becomes the incline direction of the contained angle between 0 ~ 90, just the straight face of tooth for the tooth inclined plane is close to the setting of second bearing chamber.

In some embodiments, the first sealing structure is sleeved on the outer periphery of the main shaft, the outer diameter of the main shaft is D01, the radial gap between the outer peripheral surface of the main shaft and the tooth clearance surface is a first radial gap J1, and J11/D01= 0.01-0.02.

In some embodiments, the distance between the tooth clearance surface and the tooth bottom surface along the radial direction is the tooth height C01 of the seal tooth, the width of the tooth clearance surface along the axial direction is the tooth width C02 of the seal tooth, the included angle between the tooth inclined surface and the tooth bottom surface is the tooth oblique angle C03 of the seal tooth, the distance between two adjacent seal teeth along the axial direction is the tooth spacing C04, and the inner diameter of the tooth clearance surface is the tooth inner diameter C05; and comprises the following components:

C01/C05= 0.03-0.06; and/or, C02/C05=0.006 to 0.02; and/or, C03=90 ° -150 °;

and/or, C04/C05=0.03 to 0.08.

In some embodiments, the main shaft is mounted on the fan base by the second radial bearing, and the second bearing cavity is located in a space surrounded by the fan base, the main shaft, the first sealing structure and the second sealing structure; the first seal structure being proximate the compressor portion relative to the second seal structure;

still include the balancing piece, the balancing piece cover is located on the main shaft and with the position that the second seal structure is relative, the second seal structure is annular tubular structure and the cover is located the periphery of balancing piece, the inner periphery of second seal structure with second radial clearance J12 has between the periphery of balancing piece, forms clearance seal.

In some embodiments, the second seal structure has an inner diameter D12 and J12/D12=0.01 to 0.08.

In some embodiments, the air cycle machine includes a bearing housing, a first bearing cavity disposed radially inward of the bearing housing, a third seal structure abutting an axial side end face of the bearing housing, and a fourth seal structure abutting an axial other side end face of the bearing housing;

the air inlet channel is formed in the bearing seat; the main shaft is assembled on the bearing seat through the first radial bearing, the first thrust bearing and the second thrust bearing, and the first bearing cavity is located in a cavity surrounded by the bearing seat, the main shaft, the third sealing structure and the fourth sealing structure.

In some embodiments, the cooling passage includes a first cooling passage having one end communicable with the first bearing cavity and the other end communicable with the second cooling passage, a second cooling passage extending in an axial direction of the main shaft, and a third cooling passage having one end communicable with one end of the second cooling passage and the other end communicable with the second bearing cavity.

In some embodiments, the compressor further comprises a radial shaft, the radial shaft is sleeved on part of the outer periphery of the shaft section of the main shaft, one axial end of the radial shaft can axially position the compressor part, and a third cavity is formed between the radial inner periphery of at least part of the shaft section of the radial shaft and the outer periphery of the main shaft; cooling air in the first bearing cavity can enter the third cavity to cool the radial shaft and the main shaft.

In some embodiments, the first radial bearing is sleeved on an outer periphery of a partial shaft section of the radial shaft; the second thrust bearing is also sleeved on the periphery of part of the shaft section of the radial shaft, an annular groove is formed in the periphery of the radial shaft, and the second thrust bearing is arranged in the annular groove to axially limit the radial shaft; the radial shaft is fixedly connected with the main shaft.

In some embodiments, the radial shaft is further provided with a radial air hole, one end of the radial air hole is communicated with the first bearing cavity, the other end of the radial air hole is communicated with the third cavity, one end of the first cooling channel is communicated with the third cavity, the radial air hole and the first cooling channel are not arranged oppositely, and the radial air hole and the first cooling channel are arranged at an interval in the axial direction of the main shaft.

In some embodiments, a partial structure of a thrust shaft is further provided between the first thrust bearing and the second thrust bearing, one end of the air inlet passage is opposite to the thrust shaft, and cooling air enters the first bearing cavity from the air inlet passage and cools the first thrust bearing and the second thrust bearing respectively, and then reaches and cools the first radial bearing; then enters the second cooling channel inside the main shaft through the first cooling channel; and cooling gas enters the second cooling channel and then enters the second bearing cavity through the third cooling channel to cool the second radial bearing, and the other axial end of the radial shaft is abutted to the thrust shaft.

In some embodiments, a first gap is disposed between the first radial bearing and the main shaft or on the first radial bearing along an axial direction of the first radial bearing, and the first gap can conduct an airflow on one axial side of the first radial bearing to the other axial side of the first radial bearing; the first thrust bearing and the thrust shaft are provided with a second gap, the second thrust bearing and the radial shaft are provided with a third gap, the thrust shaft is provided with a fourth gap along the axial direction, the fourth gap can conduct airflow at one axial side of the thrust shaft to the other axial side of the thrust shaft, and the second thrust bearing is positioned between the thrust shaft and the first radial bearing.

In some embodiments, gas passing through the second radial bearing can be channeled into a suction port of the compressor section; alternatively, the first and second liquid crystal display panels may be,

and the fan base is also provided with an air passage, one end of the air passage is communicated with the second bearing cavity, and the other end of the air passage can be communicated to the outside of the fan base.

In some embodiments, the first radial bearing and the second radial bearing are radial pneumatic bearings; and/or the first thrust bearing and the second thrust bearing are thrust pneumatic bearings.

In some embodiments, a second air-entraining channel is further disposed on the expansion casing of the expander portion, an air guide portion is further disposed on the expansion casing, a third air-entraining channel is disposed on the air guide portion, one end of the first air-entraining pipeline is communicated with one end of the third air-entraining channel, the other end of the third air-entraining channel is communicated with one end of the second air-entraining channel, and the other end of the second air-entraining channel is communicated with the expansion cavity of the expander portion.

The utility model provides a pair of air cycle machine has following beneficial effect:

1. the utility model discloses an air cycle machine, through setting up first pipeline and the admission line of arousing, can introduce and introduce the gas in the inflation chamber to first bearing chamber, thereby can be effectively to the first journal bearing in the first bearing chamber, first footstep bearing and second footstep bearing carry out the cooling effect, still hold another bearing chamber (second bearing chamber) of bearing device through the design, make the gas after the cooling of first bearing chamber be conducted to the second bearing chamber through the cooling channel that main shaft inside was seted up again, be used for cooling effect to the second journal bearing, cooling gas flow and the bearing device direct contact that needs cooling, take away a large amount of heats of bearing device, effectively improved the cooling effect to the bearing, the heat-sinking capability has been strengthened; and still set up first and second seal structure respectively through the both ends of the fan seat that forms the second bearing chamber, can carry out effectual sealing effect to the second bearing chamber, and first seal structure includes two at least seal tooth structures, and seal tooth includes tooth straight face and tooth inclined plane, and tooth straight face is close to first bearing chamber for the tooth inclined plane sets up, because the mainstream direction of cooling gas flows along axial direction, therefore through tooth straight face that sets up along radial direction is close to first bearing chamber for the tooth inclined plane that the slope set up, can provide the gaseous resistance to the gas flow direction than the tooth inclined plane through tooth straight face, thereby can improve the sealing effect of first seal structure, the tooth inclined plane sets up the back in the air current flow direction, can make the air current that turns over tooth straight face flow along the direction of tooth inclined plane a small amount of, effectively reduce the vortex (backward flow) at the back of seal tooth, thereby effectively reduce the air current loss, and cushion in first seal chamber, the next tooth straight face is further stopped, thereby can improve the sealing effect to the gas to a great extent.

2. The utility model also can make the cooling gas enter the third cavity formed between the inner periphery of the radial shaft and the outer periphery of the main shaft, so as to further effectively cool the radial shaft and the main shaft and improve the cooling effect on the main shaft, the radial shaft and the bearing; and the radial shaft sleeved on the periphery of the shaft section of the main shaft part can effectively perform axial positioning on the compressor part, so that an accurate positioning effect is achieved on the compression impeller, the positioning precision is improved, and the stability under high-speed operation is ensured.

3. The utility model discloses still through communicating the other end in second bearing chamber to compressor part's suction opening, make in first bearing chamber and the second bearing chamber gas after cooling the bearing in proper order can be led into to compressor part's suction opening to increase compressor suction opening gaseous temperature, improve the degree of superheat of breathing in, improve the compression capacity, improve air cycle machine's efficiency, improve energy-conserving effect; and prevent liquid hammer; therefore, the air cycle machine of the utility model can effectively take away the friction heat of the high-speed bearing, improve the stability of the rotor system rotating at high speed, and simultaneously recycle the discharged high-pressure airflow, thereby obtaining the energy-saving effect;

drawings

FIG. 1 is a perspective view of an air cycle machine according to an embodiment of the present invention;

FIG. 2 is a perspective view of a rotor assembly of an air cycle machine according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of an air cycle machine according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of an air cycle machine according to an embodiment of the present invention with the first radial bearing, the first thrust bearing, the second thrust bearing, and the second radial bearing removed;

FIG. 4a is an enlarged partial structural view of the first seal structure of FIG. 4;

FIG. 4b is an enlarged partial view of the second seal structure of FIG. 4;

FIG. 5 is a schematic view of an internal cooling flow path of an air cycle machine according to an embodiment of the present invention;

FIG. 6 is a tooth construction feature of the first seal structure of FIG. 4 a;

FIG. 7 is a tooth construction parameter diagram of the first seal construction of FIG. 4 a.

The reference numerals are represented as:

100. an expander section; 200. a compressor section; 300. a fan section; t01, an expander inlet; t02, an expander outlet; c01, a compressor inlet; c02, an outlet of the compressor; f01, a fan blade air inlet; f02, a fan blade air outlet; z01, a rotor;

01. a main shaft; 0101. a first cooling channel; 0102. a second cooling channel; 0103. a third cooling channel; 0104. a second cylindrical surface; 02. a radial axis; 0201. radial air holes; 0202. a first cylindrical surface; b0201, a first radial bearing; b0202, a second radial bearing; b0203, a first thrust bearing; b0204, a second thrust bearing; 03. a thrust shaft; 0301. a fourth gap; 04. an expansion shell; 0401. a second bleed air passage; 05. an air guide part; 0501. a third bleed air passage; 06. a first bleed air line; 07. a bearing seat; 0701. an air intake passage; 08. a third seal structure; 09. a fourth seal structure; 10. a fan base; 11. a first seal structure; 12. a second seal structure; 13. a balance member; q1, a first bearing cavity; q2, a second bearing cavity; q3, a third cavity; q11, a first sealed cavity; m01, a tooth clearance surface; m02, straightening the tooth surface;

m03, tooth inclined planes; m04, a tooth bottom surface; j11, a first radial gap; j12, a second radial gap; c01, tooth height; c02, tooth width; c03, tooth bevel angle; c04, tooth space; c05, tooth inner diameter.

Detailed Description

To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

With reference to fig. 1-7, an embodiment of the present invention provides an air cycle machine, including:

the air conditioner comprises an expander part 100, a compressor part 200, a fan part 300 and a main shaft 01, wherein the main shaft 01 penetrates through the expander part 100, the compressor part 200 and the fan part 300; the air cycle machine further comprises a first radial bearing B0201, a second radial bearing B0202, a first thrust bearing B0203, a second thrust bearing B0204, a first bleed air line 06 and an air inlet channel 0701, the main shaft 01 is supported by the first radial bearing B0201, the second radial bearing B0202, the first thrust bearing B0203 and the second thrust bearing B0204, and the first radial bearing B0201, the first thrust bearing B0203 and the second thrust bearing B0204 are all arranged in the first bearing cavity q 1; the second radial bearing B0202 and the first radial bearing B0201 are arranged at an interval in the axial direction of the main shaft 01, and the second radial bearing B0202 is arranged in the second bearing cavity q2;

one end of the first bleed air pipeline 06 can introduce gas from the expansion cavity of the expander portion 100, and the other end thereof is communicated with one end of the air inlet channel 0701, and the other end of the air inlet channel 0701 is communicated with the first bearing cavity q1 for delivering cooling air for cooling the first radial bearing B0201, the first thrust bearing B0203 and the second thrust bearing B0204; a cooling channel is arranged inside the main shaft 01, and can conduct the gas in the first bearing cavity q1 to the second bearing cavity q2 for conveying cooling air for cooling the second radial bearing B0202;

the air cycle machine comprises a fan base 10, a first sealing structure 11 and a second sealing structure 12, wherein a second bearing cavity q2 is arranged on the radial inner side of the fan base 10, the first sealing structure 11 abuts against the end face of one axial side of the fan base 10, and the second sealing structure 12 abuts against the end face of the other axial side of the fan base 10;

the first sealing structure 11 is an annular structure and includes at least 2 sealing teeth located on the radial inner periphery thereof and arranged at intervals in the axial direction, each sealing tooth includes a tooth clearance surface M01, a tooth straight surface M02 and a tooth inclined surface M03, a first sealing cavity q11 is formed between two adjacent sealing teeth, a tooth bottom surface M04 is formed at the groove bottom of the first sealing cavity q11, the tooth clearance surface M01 is an end surface located on the radial inner side of the sealing tooth and is located along the axial direction of the first sealing structure 11, the tooth straight surface M02 is an end surface located on one axial side of the sealing tooth, the tooth inclined surface M03 is an end surface located on the other axial side of the sealing tooth, the tooth straight surface M02 extends along the radial direction of the first sealing structure 11, the tooth inclined surface M03 extends along an inclined direction forming an included angle of 0 to 90 ° with the radial direction of the first sealing structure 11, and the tooth straight surface M02 is arranged close to the second bearing cavity q2 relative to the tooth inclined surface M03.

The utility model discloses an air cycle machine, through setting up first pipeline and the admission line that arouses, can introduce and lead into the gas in the inflation chamber to first bearing chamber, thereby can be effectively to the first journal bearing in the first bearing chamber, first footstep bearing and second footstep bearing carry out the cooling effect, still hold another bearing chamber (second bearing chamber) of bearing device through the design, make the gas after the cooling of first bearing chamber be conducted to the second bearing chamber through the cooling channel that main shaft inside was seted up again, be used for cooling effect to the second journal bearing, cooling gas flow and the bearing device direct contact that needs cooling, take away a large amount of heats of bearing device, effectively improved the cooling effect to the bearing, the heat-sinking capability has been strengthened; and still set up first and second seal structure respectively through the both ends of the fan seat that forms the second bearing cavity, can carry out effectual sealing action to the second bearing cavity, and first seal structure includes two at least seal tooth structures, and seal the tooth and include tooth straight face and tooth inclined plane, and tooth straight face is close to the first bearing cavity setting for the tooth inclined plane, because the mainstream direction of cooling gas flows along the axial direction, therefore through tooth straight face that sets up along radial direction is close to the first bearing cavity for the tooth inclined plane that the slope sets up, can provide the gaseous resistance to the gas flow direction than tooth inclined plane through tooth straight face, thereby can improve the sealed effect of first seal structure, tooth inclined plane sets up the back in the air current flow direction, can make a small amount of air current that overturns tooth straight face flow along the direction of tooth inclined plane, effectively reduce the vortex (backward flow) at the seal tooth back, thereby effectively reduce the air current loss, and cushion in first seal cavity, further stopped at next tooth straight face, thereby can still improve the sealed effect to the gas to 3 bearings cooling while bigger degree.

In some embodiments, the first sealing structure 11 is sleeved on the outer periphery of the main shaft 01, the outer diameter of the main shaft 01 is D01, the radial gap between the outer peripheral surface of the main shaft 01 and the tooth gap surface M01 is a first radial gap J1, and J11/D01=0.01 to 0.02. If the J11 value is too big, then sealed effect is not good, if the J11 value is too little, wearing and tearing appear easily, consequently the utility model discloses J11/D01=0.01 ~ 0.02 can also effectively reduce or prevent wearing and tearing when both guaranteeing sealed effect, further preferred J1/D01=0.014.

1. The utility model provides a cooling gas flow path. And air passages are arranged on the shaft system and the structure adjacent to the shaft system, so that the self-cooling function of the pneumatic bearing of the supporting shaft system is realized.

2. The utility model provides a radial axle and thrust shaft hold seal structure characteristic and parameter in chamber.

3. The utility model provides a take main shaft structure of air current cooling flow path, this main shaft constitutes the shafting that the gas circuit link up jointly with radial axis and main shaft.

4. The utility model provides an air cycle machine, it contains shafting and cooling flow path.

The technical problem to be solved is as follows:

1. meanwhile, the technical problem of high-efficiency multi-path cooling and the sealing problem of the pneumatic bearing of the air cycle machine are solved;

2. solves the problem of flow distribution when the pneumatic bearings at different positions are cooled,

has the advantages that:

1. the cavity for accommodating the bearing has good sealing performance.

2. The utility model discloses a cooling flow path realizes the pneumatic bearing self-cooling function of supporting shafting, has ensured the reliability of the rotor system of high-speed rotation.

3. And the bearings are cooled in a multi-path manner, so that the cooling efficiency of the bearings is improved.

4. The utility model discloses an adopt shafting that the gas circuit link up to realize a cooling flow path, need not to carry out flow distribution to the pneumatic bearing cooling of different positions.

As shown in fig. 1. The rotary power of the rotor Z01 comes from the expansion work of the gas, the gas flows into the T01 and then expands to do work, the temperature of the gas after the work is done is reduced, and the low-temperature gas flows out from the T02 and is conveyed to the area needing refrigeration. The expansion work drives the rotor Z01 to rotate, and the compression impeller on the rotor Z01 sucks gas from the C01, compresses the gas, and discharges the gas from the C02. Meanwhile, the fan blades on the rotor Z01 suck air from the rotor F01 and discharge the air at the position F02 to drive cooling airflow.

As shown in fig. 5 and 6. In order to ensure that the air of the cooling air flow 5 is in an orderly and controllable state, the sealing performance of the second bearing cavity q2 and the flowing directionality of the air flow 5 in the second bearing cavity q2 need to be considered, and the second bearing cavity q2 is formed by combining a static part (a fan seat 10, a first sealing structure 11 and a second sealing structure 12) and a rotating part (a balance part 13 and a shaft 01), so that the sealing problem of the second bearing cavity q2 is solved, and the sealing problem between a high-speed rotating part and the static part is actually solved. To this end, a sealing tooth is provided on the first sealing structure 11, which sealing tooth comprises 4 geometric features: a tooth clearance surface M01, a tooth straight surface M02, a tooth inclined surface M03 and a tooth bottom surface M04. The tooth clearance surface M01 of the first seal structure 11 and the second cylindrical surface 0104 form a first radial clearance J11. A small part of the air flow 5 in the second bearing cavity q2 leaks to a first sealing cavity q11 through a first radial gap J11, and the first sealing cavity q11 is a cavity with an annular inlet and outlet and is defined by a tooth straight surface M02, a tooth inclined surface M03, a tooth bottom surface M04 and a second cylindrical surface 0104. The pressure of the leakage flow decreases after expansion in the first seal cavity q11, and after passing through the plurality of first seal cavities q11, the pressure is close to or lower than the pressure at the other side of the first seal structure 11, thereby reducing or even eliminating leakage of the flow 5 through the first radial gap J11. A second radial gap J12 is provided between the second seal structure 12 and the balance member 13, and the flow of the air flow 5 through the second radial gap J12 is controlled, so that the flow direction of the air flow 5 in the second bearing cavity q2 is controlled, and the air flow 5 cools the radial bearing B0202, flows to the second seal structure 12, and is discharged from the second radial gap J12 to the cooling flow path.

In some embodiments, a distance between the tooth clearance surface M01 and the tooth bottom surface M04 in the radial direction is a tooth height C01 of the seal tooth, a width of the tooth clearance surface M01 in the axial direction is a tooth width C02 of the seal tooth, an included angle between the tooth slope surface M03 and the tooth bottom surface M04 is a tooth bevel angle C03 of the seal tooth, a distance between two adjacent seal teeth in the axial direction is a tooth distance C04, and an inner diameter of the tooth clearance surface M01 is a tooth inner diameter C05;

C01/C05= 0.03-0.06; and/or, C02/C05= 0.006-0.02; and/or, C03=90 ° -150 °;

and/or, C04/C05=0.03 to 0.08.

If C01 is too large, the teeth are too high, and the strength needs to be ensured, so that the teeth are thicker; if C01 is too small, the expansion effect of the cavity is poor, and C01/C05= 0.03-0.06 can improve the expansion effect of the cavity while ensuring the strength; further preferably 0.048. If C02 is too small, broken teeth are easy to occur in processing; if C02 is large, the axial space ratio is large, so C02/C05=0.006 to 0.02 can reduce the axial space ratio of the teeth while ensuring the structural strength of the unbreakable teeth, without increasing the volume of the air cycle machine, and more preferably 0.012; if C03 is too small, the seal tooth root strength is low, and C03 is too large, the expansion space is small, and the expansion effect is not good, so that C03=90 ° to 150 ° can improve the expansion space while ensuring the tooth root strength, and more preferably 110 °. If C04 is too large, the axial space ratio is large, and if C04 is too small, the expansion space is small, and the expansion effect is not good, so C04/C05=0.03 to 0.08 can increase the expansion space while reducing the tooth axial space ratio, and more preferably 0.052.

In some embodiments, said main shaft 01 is mounted on said fan base 10 by said second radial bearing B0202, and said second bearing cavity q2 is located in a space enclosed by said fan base 10, said main shaft 01, said first sealing structure 11 and said second sealing structure 12; said first seal structure 11 being adjacent said compressor portion 200 relative to said second seal structure 12;

the balance structure further comprises a balance piece 13, the balance piece 13 is sleeved on the main shaft 01 and is opposite to the second sealing structure 12, the second sealing structure 12 is of an annular cylindrical structure and is sleeved on the outer periphery of the balance piece 13, and a second radial gap J12 is formed between the inner periphery of the second sealing structure 12 and the outer periphery of the balance piece 13 to form gap sealing.

The utility model discloses still through second seal structure to set up it into and the main shaft between clearance seal, the utility model discloses a second seal structure of the one end setting of keeping away from the compressor relatively to set up it into clearance seal, can be in the assurance can be with the second bearing chamber in the gas effectively seal outside, can also discharge the gas in this chamber through the radial clearance of second, realized sealed and carminative effect simultaneously effectively.

In some embodiments, the second seal structure 12 has an inner diameter D12 and J12/D12=0.01 to 0.08. If clearance J12 gets the undersize, air current 5 can not flow from clearance J12 smoothly, appears the rotor simultaneously and bumps the mill easily, and too big then leads to sealed effect poor, leaks seriously, consequently the utility model discloses with it sets up at J12D 12=0.01 ~ 0.08, can also prevent to leak seriously when guaranteeing to discharge the air current smoothly, realize the exhaust of low discharge, still guaranteed the leakproofness simultaneously, its preferred 0.025. If the gap is too large, some angular regions of the cycle may experience a concentration of flow, and some angular regions may experience little flow. The small gap is controlled to ensure that the gas flows through the gap in a laminar state in a 360-degree range. The disturbance effect of the uneven air flow on the rotor is avoided when the air flow at certain angles is large and the air flow at certain angles is small.

In some embodiments, the air cycle machine includes a bearing seat 07, a third sealing structure 08, and a fourth sealing structure 09, the first bearing cavity q1 is disposed radially inside the bearing seat 07, the third sealing structure 08 abuts against an axial one-side end face of the bearing seat 07, and the fourth sealing structure 09 abuts against an axial other-side end face of the bearing seat 07;

the air inlet passage 0701 is formed in the bearing block 07; the main shaft 01 is assembled on the bearing seat 07 through the first radial bearing B0201, the first thrust bearing B0203 and the second thrust bearing B0204, and the first bearing cavity q1 is positioned in a cavity surrounded by the bearing seat 07, the main shaft 01, the third sealing structure 08 and the fourth sealing structure 09. The utility model discloses an inlet channel sets up on the bearing frame, can introduce the cooling gas in the inflation chamber, and the effect of bearing frame mainly is to supporting first journal bearing, first footstep bearing and second footstep bearing, simultaneously in the inside first bearing chamber that forms of bearing frame for can also let in cooling gas wherein in order to cool off above-mentioned bearing when holding above-mentioned bearing.

As shown in fig. 4. The bearing seat 07, the third seal structure 08, the fourth seal structure 09, the radial shaft 02 and the thrust shaft 03 constitute a cavity (a first bearing cavity q 1), and the first bearing cavity q1 accommodates a first radial bearing B0201, a first thrust bearing B0203 and a second thrust bearing B0204. The fan base 10, the first sealing structure 11, the second sealing structure 12, the balancing piece 13 and the main shaft 01 form a second bearing cavity q2, and the second bearing cavity q2 contains a second radial bearing B0202.

In some embodiments, the cooling passages include a first cooling passage 0101, a second cooling passage 0102, and a third cooling passage 0103, the first cooling passage 0101 has one end capable of communicating with the first bearing cavity q1 and the other end capable of communicating with the second cooling passage 0102, the second cooling passage 0102 extends in the axial direction of the main shaft 01, and the third cooling passage 0103 has one end communicating with one end of the second cooling passage 0102 and the other end communicating with the second bearing cavity q2. This is the utility model discloses a cooling channel's preferred structural style can follow first bearing cavity through first cooling channel and introduce cooling gas promptly to get into second cooling channel, second cooling channel is along axial extension in order to switch on gas to third cooling channel department, and third cooling channel exports cooling gas to second bearing cavity in, thereby accomplishes cooling gas's effective transmission, plays the cooling action to 3 bearings in the first bearing cavity and 1 bearing in the second bearing cavity simultaneously.

In some embodiments, the compressor further comprises a radial shaft 02, the radial shaft 02 is sleeved on a part of the outer periphery of the shaft section of the main shaft 01, one axial end of the radial shaft 02 can axially position the compressor part, and a third cavity q3 is formed between the radial inner periphery of at least a part of the shaft section of the radial shaft 02 and the outer periphery of the main shaft 01; the cooling air in the first bearing chamber q1 can enter the third chamber q3 to cool the radial shaft 02 and the main shaft 01.

The utility model also can make the cooling gas enter the third cavity formed between the inner periphery of the radial shaft and the outer periphery of the main shaft, so as to further effectively cool the radial shaft and the main shaft and improve the cooling effect on the main shaft, the radial shaft and the bearing; and the radial shaft sleeved on the periphery of the shaft section of the main shaft part can effectively perform axial positioning on the compressor part, so that an accurate positioning effect is achieved on the compression impeller, the positioning precision is improved, and the stability under high-speed operation is ensured.

As shown in fig. 2. In the air cycle machine, the radial direction of the rotor Z01 is supported by a first radial bearing B0201 and a second radial bearing B0202, and the axial direction of the rotor Z01 is supported by a first thrust bearing B0203 and a second thrust bearing B0204. As shown in fig. 3, the first radial bearing B0201 supports the first cylindrical surface 0202 of the radial shaft 02, and the second radial bearing B0202 supports the second cylindrical surface 0104 of the main shaft 01.

In some embodiments, the first radial bearing B0201 is sleeved on the outer periphery of a part of the shaft section of the radial shaft 02; the second thrust bearing B0204 is also sleeved on the periphery of a part of the shaft section of the radial shaft 02, an annular groove is formed in the periphery of the radial shaft 02, and the second thrust bearing B0204 is arranged in the annular groove to axially limit the radial shaft 02; the radial shaft 02 and the main shaft 01 are fixedly connected (for example, in an interference fit). This is the utility model discloses a relation between first radial bearing, second thrust bearing respectively and the radial axle, the preferred interference fit of radial axle is located the periphery of main shaft promptly, and the periphery of radial axle is located to first radial bearing cover to reach the purpose to main shaft radial support through the radial axle; the second thrust bearing realizes the axial support of the radial shaft through the annular groove arranged on the periphery of the radial shaft so as to achieve the purpose of axially supporting the main shaft.

In some embodiments, the radial shaft 02 further has radial air holes 0201 formed thereon, one end of the radial air holes 0201 is communicated with the first bearing cavity q1, the other end is communicated with the third cavity q3, one end of the first cooling channel 0101 is communicated with the third cavity q3, and the radial air holes 0200 are not disposed opposite to the first cooling channel 0101, and are disposed at an interval in the axial direction of the main shaft 01. The utility model discloses still can switch on the cooling gas in the first bearing cavity to the third cavity in through radial gas pocket 0201 of radial axle inside, further cool off radial axle and main shaft in the third cavity, improve the cooling effect, during the inside second cooling channel of cooling air in the third cavity through first cooling channel entering main shaft.

In some embodiments, at least a partial structure of a thrust shaft 03 is further provided between the first thrust bearing B0203 and the second thrust bearing B0204, one end of the air inlet channel 0701 is opposite to the thrust shaft 03, and cooling gas enters the first bearing cavity q1 from the air inlet channel 0701 and cools the first thrust bearing B0203 and the second thrust bearing B0204 respectively, and then reaches and cools the first radial bearing B0201; then, the cooling medium enters the second cooling channel 0102 inside the main shaft 01 through the first cooling channel 0101; after entering the second cooling channel 0102, the cooling gas enters the second bearing cavity q2 through the third cooling channel 0103 and cools the second radial bearing B0202. The utility model discloses still through the thrust axle construction that sets up between two footstep bearings, can play the thrust effect to two orientations of main shaft together with two footstep bearings, and the utility model discloses an inlet channel is relative with the thrust axle for cooling gas in the entering first bearing chamber can cool off two footstep bearings respectively, then further carries out the cooling action to first journal bearing again, realizes the effect to the effective cooling of three bearing.

As shown in fig. 3 and 5. The air flow 1 led out from the expansion housing 04 flows into the first bearing chamber q1 via the second bleed air channel 0401, the third bleed air channel 0501, the first bleed air line 06 and the air inlet channel 0701 in this order. Gas stream 1 is split into two parts, gas stream 11 and gas stream 12. The air flow 11 passes through the gap between the first thrust bearing B0203 and the thrust shaft 03, and carries away heat generated when the thrust shaft 03 rotates at a high speed relative to the first thrust bearing B0203. The air flow 12 passes through the gap between the second thrust bearing B0204 and the thrust shaft 03, and carries away heat generated when the thrust shaft 03 rotates at a high speed relative to the second thrust bearing B0204. The air stream 11 passes through the axial air hole (fourth gap 0301), then merges with the air stream 12 to form an air stream 2, flows through the gap between the first radial bearing B0201 and the hollow radial shaft 02, carries away heat Q1 generated when the radial shaft 02 rotates at a high speed relative to the first radial bearing B0201, and cools the first radial bearing B0201 for the first time. A part of heat generated when the radial shaft 02 rotates at a high speed with respect to the first radial bearing B0201 is transferred to the radial shaft 02, and the part of heat is denoted by Q2; the airflow 2 sequentially flows through the radial air holes 0201 to enter the third cavity Q3 to exchange heat with the radial shaft 02, so that heat Q2 is taken away, and the first radial bearing B0201 is cooled for the second time. The heat generated when the radial shaft 02 rotates at a high speed with respect to the first radial bearing B0201 is partly transferred to the main shaft 01, and the part of the heat is denoted by Q3; the air flow 3 in the third cavity Q3 flows through the radial air holes (the first cooling channel 0101), and converges into the air flow 4 in the axial middle hole (the second cooling channel 0102) to exchange heat with the main shaft 01 in a convection manner, so that the heat Q3 is taken away, and the first radial bearing B0201 is cooled for the third time. The air flow 4 flows through the radial air holes (the third cooling passages 0103), and forms an air flow 5 in the gap between the second radial bearing B0202 and the main shaft 01, and the air flow 5 is discharged out of the bearing cooling flow passage after cooling the second radial bearing B0202.

In some embodiments, the other axial end of the radial shaft 02 abuts the thrust shaft 03. The utility model discloses an axial one end of radial shaft forms the axial spacingly to compression impeller, and the axial other end carries out the butt with the thrust axle, can realize the thrust conduction to compression impeller through thrust dish and radial shaft to improve the axial positioning precision to compression impeller.

In some embodiments, a first gap is disposed between the first radial bearing B0201 and the main shaft 01 or on the first radial bearing B0201 in the axial direction thereof, and the first gap can conduct the air flow on one axial side of the first radial bearing B0201 to the other axial side thereof. The utility model discloses a first clearance that first journal bearing and main shaft or first journal bearing were inside to be seted up along the axial can be with preferably through first clearance to first journal bearing cooling with gas as in fig. 3 to switch on it to first journal bearing's left end, play the cooling and the effective effect that switches on.

In some embodiments, a second gap is formed between the first thrust bearing B0203 and the thrust shaft 03, a third gap (a gap between the first cylindrical surface 0202 of the radial shaft 02 and the second thrust bearing) is formed between the second thrust bearing B0204 and the radial shaft 02, a fourth gap 0301 is formed in the thrust shaft 03 along the axial direction of the thrust shaft, the fourth gap can conduct the airflow at one axial side of the thrust shaft 03 to the other axial side of the thrust shaft, and the second thrust bearing B0204 is located between the thrust shaft 03 and the first radial bearing B0201. The utility model discloses still can cool off first footstep bearing through this second clearance with the gas that gets into in the first bearing chamber through the second clearance between first footstep bearing and the thrust shaft, the third clearance between second footstep bearing and the radial axle can make the gas that gets into in the first bearing chamber carry out the cooling action to second footstep bearing and radial axle through this third clearance, the fourth clearance can pass the thrust shaft and arrive the second footstep bearing to the gas that first footstep bearing cooled off, accomplish the effect that cooling gas's effective switched on, the realization utilizes gas cooling and with the effect of gas transmission.

As shown in fig. 3. A set of shaft system is arranged in the rotor Z01, and the shaft system consists of a main shaft 01, a radial shaft 02 and a thrust shaft 03. A first cooling channel 0101 (radial air holes), a second cooling channel 0102 (axial center holes), and a third cooling channel 0103 (radial air holes) are disposed on the main shaft 01. Radial air holes 0201 are arranged on the radial shaft 02. An axial air hole (fourth gap 0301) is arranged on the thrust shaft 03. The air channel of the shafting is communicated through the hole of the shafting, the technical problem of air channel continuity of pneumatic bearings (a first radial bearing B0201, a second radial bearing B0202, a first thrust bearing B0203 and a second thrust bearing B0204) to be cooled at different positions is solved, and the problem of flow distribution of cooling air flow of the bearings at different positions is solved.

In some embodiments, a second bleed air channel 0401 is further provided on the expansion housing 04 of the expander section 100, an air guide 05 is further provided on the expansion housing 04, a third bleed air channel 0501 is provided on the air guide 05, one end of the first bleed air line 06 communicates with one end of the third bleed air channel 0501, the other end of the third bleed air channel 0501 communicates with one end of the second bleed air channel 0401, and the other end of the second bleed air channel 0401 communicates with the expansion chamber of the expander section. The utility model discloses a setting up of second bleed air passageway, air guide and third bleed air passageway can effectively realize exporting the cooling gas in the inflation chamber to cool off in order to the bearing in the first bearing chamber, realizes cooling gas's transmission through the inside cooling channel of main shaft to the realization is to the bearing refrigerated effect in the second bearing chamber.

As shown in fig. 3. At the inlet of the expansion housing 04, a gas circuit (second bleed air channel 0401) is provided. An air path (third air introduction channel 0501) is arranged on the component (air guide 05). The third bleed air channel 0501 is connected through the second bleed air channel 0401. The first bleed air line 06 is assembled in one piece with the air guide 05. The first bleed air line 06 passes through the third bleed air channel 0501. An air inlet channel 0701 is arranged in the bearing block 07, and the air inlet channel 0701 is connected with the first bleed air pipeline 06 in a penetrating manner.

As shown in fig. 3. The fan base 10, the first sealing structure 11, the second sealing structure 12 and the main shaft 01 form a second bearing cavity q2, and the second bearing cavity q2 accommodates a second radial bearing B0202.

As shown in fig. 3-5. The portion Q4 where heat generated when the main shaft 01 rotates at a high speed with respect to the second radial bearing B0202 is transferred to the main shaft 01; when the air flow 4 flows through a partial section of an axial middle hole (a second cooling channel 0102) included in the second radial bearing B0202, the air flow 4 and the main shaft 01 exchange heat in a convection manner, so that heat Q4 is taken away, and the second radial bearing B0202 is cooled for the first time. The gas flow 4 in the axial middle bore (second cooling channel 0102) flows through the third cooling channel 0103 into the second bearing cavity q2. The air flow 5 in the second bearing cavity Q2 flows through the gap between the second radial bearing B0202 and the main shaft 01, and carries away part of the heat Q5 generated when the main shaft 01 rotates at a high speed relative to the second radial bearing B0202, thereby achieving a second cooling of the second radial bearing B0202. Finally, air stream 5 is drawn in by the compressor and enters the subsequent cycle, or exits the air cycle machine from the fan side.

In some embodiments, said first radial bearing B0201 and said second radial bearing B0202 are radial pneumatic bearings; and/or the first thrust bearing B0203 and the second thrust bearing B0204 are thrust pneumatic bearings. This is a preferred embodiment of the radial bearing and of the thrust bearing according to the invention.

The utility model discloses still through communicating the other end in second bearing chamber to the suction opening of compressor part, make in proper order in first bearing chamber and the second bearing chamber to the gas after the bearing cooling can be led into to the suction opening of compressor part to increase the gaseous temperature of compressor suction opening, improve the degree of superheat of breathing in, improve the compression capacity, improve the efficiency of air cycle machine, improve energy-conserving effect; and prevent liquid hammer; therefore the utility model discloses an air cycle machine can take away high-speed bearing frictional heat effectively, has improved the stability of the rotor system of high-speed rotation, and the high pressure draught that can also recycle was discharged simultaneously has gained energy-conserving effect.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (15)

1. An air cycle machine, comprising:

the air conditioner comprises an expander part (100), a compressor part (200), a fan part (300) and a main shaft (01), wherein the main shaft (01) penetrates through the expander part (100), the compressor part (200) and the fan part (300); the air cycle machine further comprises a first radial bearing (B0201), a second radial bearing (B0202), a first thrust bearing (B0203) and a second thrust bearing (B0204), a first bleed air pipeline (06) and an air inlet channel (0701), the spindle (01) is supported by the first radial bearing (B0201), the second radial bearing (B0202), the first thrust bearing (B0203) and the second thrust bearing (B0204), and the first radial bearing (B0201), the first thrust bearing (B0203) and the second thrust bearing (B0204) are all arranged in the first bearing cavity (q 1); the second radial bearing (B0202) and the first radial bearing (B0201) are arranged at intervals along the axial direction of the main shaft (01), and the second radial bearing (B0202) is arranged in a second bearing cavity (q 2);

one end of the first gas guiding pipeline (06) can introduce gas from an expansion cavity of the expander part (100), the other end of the first gas guiding pipeline is communicated with one end of the gas inlet channel (0701), and the other end of the gas inlet channel (0701) is communicated with the first bearing cavity (q 1) and is used for conveying cooling air for cooling the first radial bearing (B0201), the first thrust bearing (B0203) and the second thrust bearing (B0204); a cooling channel is arranged inside the main shaft (01), and the cooling channel can conduct gas in the first bearing cavity (q 1) into the second bearing cavity (q 2) and is used for conveying cooling air for cooling the second radial bearing (B0202);

the air cycle machine comprises a fan base (10), a first sealing structure (11) and a second sealing structure (12), wherein a second bearing cavity (q 2) is arranged on the radial inner side of the fan base (10), the first sealing structure (11) abuts against the end face of one axial side of the fan base (10), and the second sealing structure (12) abuts against the end face of the other axial side of the fan base (10);

first seal structure (11) is the loop configuration, including being located its radial inner periphery and along 2 at least seal teeth that axial interval set up, seal tooth includes tooth clearance face (M01), the straight face of tooth (M02) and tooth inclined plane (M03), and two are adjacent form first seal chamber (q 11) between the seal tooth, the tank bottom of first seal chamber (q 11) forms tooth bottom face (M04), tooth clearance face (M01) is for being located the terminal surface of the radial inboard of seal tooth, along the axial of first seal structure (11), the straight face of tooth (M02) is for being located the terminal surface of the axial one side of seal tooth, tooth inclined plane (M03) is for being located the terminal surface of the axial opposite side of seal tooth, the straight face of tooth (M02) extends along the radial direction of first seal structure (11), tooth inclined plane (M03) extends along the incline direction that becomes the contained angle between 0 ~ 90 with the radial direction of first seal structure (11), and the straight face of tooth (M02) is close to the second shaft inclined plane (M2) sets up.

2. The air cycle machine of claim 1,

the first sealing structure (11) is sleeved on the periphery of the main shaft (01), the outer diameter of the main shaft (01) is D01, the radial gap between the outer peripheral surface of the main shaft (01) and the tooth gap surface (M01) is a first radial gap J1, and J11/D01= 0.01-0.02.

3. The air cycle machine of claim 1,

the distance between the tooth clearance surface (M01) and the tooth bottom surface (M04) in the radial direction is the tooth height C01 of the sealing tooth, the width of the tooth clearance surface (M01) in the axial direction is the tooth width C02 of the sealing tooth, the included angle between the tooth inclined surface (M03) and the tooth bottom surface (M04) is the tooth bevel angle C03 of the sealing tooth, the distance between two adjacent sealing teeth in the axial direction is the tooth spacing C04, and the inner diameter of the tooth clearance surface (M01) is the tooth inner diameter C05;

C01/C05= 0.03-0.06; and/or, C02/C05= 0.006-0.02; and/or, C03=90 ° -150 °; and/or, C04/C05= 0.03-0.08.

4. An air cycle machine according to claim 1, characterized in that the main shaft (01) is fitted on the fan base (10) by means of the second radial bearing (B0202), the second bearing cavity (q 2) being located in a space enclosed by the fan base (10), the main shaft (01), the first sealing structure (11) and the second sealing structure (12); said first sealing structure (11) being close to said compressor portion (200) with respect to said second sealing structure (12);

still include balancing piece (13), balancing piece (13) cover is located on main shaft (01) and with the relative position of second seal structure (12), second seal structure (12) are annular tubular structure and cover and locate the periphery of balancing piece (13), the inner periphery of second seal structure (12) with have second radial clearance J12 between the periphery of balancing piece (13), form the clearance and seal.

5. The air cycle machine of claim 4,

the second seal structure (12) has an inner diameter D12 and J12/D12=0.01 to 0.08.

6. The air cycle machine of claim 1,

the air cycle machine comprises a bearing seat (07), a third sealing structure (08) and a fourth sealing structure (09), wherein the first bearing cavity (q 1) is arranged on the radial inner side of the bearing seat (07), the third sealing structure (08) abuts against the end face of one axial side of the bearing seat (07), and the fourth sealing structure (09) abuts against the end face of the other axial side of the bearing seat (07);

the air inlet channel (0701) is formed in the bearing seat (07); the main shaft (01) is assembled on the bearing seat (07) through the first radial bearing (B0201), the first thrust bearing (B0203) and the second thrust bearing (B0204), and the first bearing cavity (q 1) is positioned in a cavity surrounded by the bearing seat (07), the main shaft (01), the third sealing structure (08) and the fourth sealing structure (09).

7. The air cycle machine according to claim 6, wherein the cooling channel includes a first cooling channel (0101), a second cooling channel (0102), and a third cooling channel (0103), one end of the first cooling channel (0101) being communicable with the first bearing cavity (q 1) and the other end being communicable with the second cooling channel (0102), the second cooling channel (0102) extending in an axial direction of the main shaft (01), one end of the third cooling channel (0103) being communicable with one end of the second cooling channel (0102) and the other end being communicable with the second bearing cavity (q 2).

8. The air cycle machine of claim 7,

the compressor further comprises a radial shaft (02), the radial shaft (02) is sleeved on the outer periphery of a partial shaft section of the main shaft (01), one axial end of the radial shaft (02) can axially position the compressor part, and a third cavity (q 3) is formed between the inner periphery of at least part of the shaft section of the radial shaft (02) and the outer periphery of the main shaft (01); the cooling air in the first bearing chamber (q 1) can enter the third chamber (q 3) to cool the radial shaft (02) and the main shaft (01).

9. An air cycle machine according to claim 8, characterized in that the first radial bearing (B0201) is fitted around a part of the circumference of the shaft section of the radial shaft (02); the second thrust bearing (B0204) is also sleeved on the periphery of a part of shaft section of the radial shaft (02), an annular groove is formed in the periphery of the radial shaft (02), and the second thrust bearing (B0204) is arranged in the annular groove to axially limit the radial shaft (02); the radial shaft (02) is fixedly connected with the main shaft (01).

10. The air cycle machine of claim 8, wherein the radial shaft (02) is further provided with radial air holes (0201), one end of each radial air hole (0201) is communicated with the first bearing cavity (q 1), the other end of each radial air hole is communicated with the third cavity (q 3), one end of the first cooling channel (0101) is communicated with the third cavity (q 3), and the radial air holes (0201) and the first cooling channel (0101) are not arranged oppositely and are arranged at intervals in the axial direction of the main shaft (01).

11. An air cycle machine according to claim 8, characterized in that at least a partial structure of a thrust shaft (03) is further provided between said first thrust bearing (B0203) and said second thrust bearing (B0204), an end of said inlet channel (0701) is opposite to said thrust shaft (03), and cooling gas enters said first bearing cavity (q 1) from said inlet channel (0701) and cools said first thrust bearing (B0203) and said second thrust bearing (B0204), respectively, and then reaches and cools said first radial bearing (B0201); then enters the second cooling channel (0102) inside the main shaft (01) through the first cooling channel (0101); and cooling gas enters the second cooling channel (0102) and then enters the second bearing cavity (q 2) through the third cooling channel (0103) to cool the second radial bearing (B0202), and the other axial end of the radial shaft (02) is abutted to the thrust shaft (03).

12. The air cycle machine according to claim 11, wherein a first gap is provided between the first radial bearing (B0201) and the main shaft (01) or on the first radial bearing (B0201) along an axial direction thereof, the first gap being capable of conducting an air flow on one axial side of the first radial bearing (B0201) to the other axial side thereof; a second gap is arranged between the first thrust bearing (B0203) and the thrust shaft (03), a third gap is arranged between the second thrust bearing (B0204) and the radial shaft (02), a fourth gap (0301) is formed in the thrust shaft (03) along the axial direction of the thrust shaft, the fourth gap can conduct the airflow on one axial side of the thrust shaft (03) to the other axial side of the thrust shaft, and the second thrust bearing (B0204) is positioned between the thrust shaft (03) and the first radial bearing (B0201).

13. The air cycle machine of claim 1,

the gas passing through the second radial bearing (B0202) can be conducted to a suction port of the compressor part (200); alternatively, the first and second electrodes may be,

an air path is further formed in the fan base (10), one end of the air path is communicated with the second bearing cavity (q 2), and the other end of the air path can be communicated to the outside of the fan base (10).

14. The air cycle machine of claim 1, wherein said first radial bearing (B0201) and said second radial bearing (B0202) are radial pneumatic bearings; and/or the first thrust bearing (B0203) and the second thrust bearing (B0204) are thrust pneumatic bearings.

15. The air cycle machine according to any of claims 1-14, characterized in that a second bleed air channel (0401) is further provided on the expansion housing (04) of the expander section (100), that an air guide (05) is further provided on the expansion housing (04), that a third bleed air channel (0501) is provided on the air guide (05), that one end of the first bleed air line (06) communicates with one end of the third bleed air channel (0501), that the other end of the third bleed air channel (0501) communicates with one end of the second bleed air channel (0401), and that the other end of the second bleed air channel (0401) communicates with an expansion chamber of the expander section.

Images