CN207538866U - Two-stage cantilevered axis stream expanding machine - Google Patents

Two-stage cantilevered axis stream expanding machine Download PDF

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CN207538866U
CN207538866U CN201721426727.1U CN201721426727U CN207538866U CN 207538866 U CN207538866 U CN 207538866U CN 201721426727 U CN201721426727 U CN 201721426727U CN 207538866 U CN207538866 U CN 207538866U
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rotor
order
level
expanding machine
air intake
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陈贤
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陈贤
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Abstract

The utility model discloses a kind of two-stage cantilevered axis stream expanding machine, including first order expanding machine, second level expanding machine and motor;The first order expanding machine includes air intake casing, first order nozzle ring and first order impeller of rotor;Second expanding machine includes unit casing body, second level nozzle ring and second level impeller of rotor;The motor includes rotor and stator winding;The air intake casing is oppositely arranged to form cavity with unit casing body, the rotor is set on along the axle center of cavity in cavity, rotor outer air intake casing to the direction of unit casing body is equipped with auxiliary thrust bearing shell, electric machine casing and second level diversion shell successively, the rotor is coaxially arranged with first order input terminal close to the end face of air intake casing, and the rotor is coaxially arranged with second level input terminal close to the end face of unit casing body.The utility model utilizes two-stage axis stream, can effectively reduce expanding machine rotating speed, promotes the reliability and efficiency of motor, frequency converter, and obtain higher energy transformation ratio.

Description

Two-stage cantilevered axis stream expanding machine
Technical field
The utility model is related to the expanding machine technical field in overbottom pressure and afterheat generating system, particularly a kind of two-stage cantilever Formula axis stream expanding machine.
Background technology
The pressure of China's natural gas transmission and distribution network is adjusted using valve pressure release at present, and pressure energy does not all obtain profit With causing a large amount of energy dissipation.About 2000 billion cubic meter of China's natural gas Year's consumption wherein adopts more than 1,300 hundred million cubes certainly Rice, import billion cubic meter more than 600.From gas production mouth to there are different degrees of pressure regulation links per family, replace adjusting using expanding machine Pressure valve is depressured, and the pressure energy of waste can be recycled, and is converted into mechanical energy for generating electricity
Natural gas belongs to flammable explosive gas, once a leak occurs, there is very big security risk.China is completed at present Several natural gas pressure difference power generating demonstration projects, there are it is many problem of, most important problem is exactly the leakage of natural gas.Tradition Method be that shaft end seal is installed on expanding machine output shaft.The sealing of use mainly has piston ring, mechanical seal and dry gas seals. Piston ring sealed price is cheap, simple in structure, but sealing performance is poor, is often accompanied by a small amount of natural gas leakings.Mechanical seal needs High pressure petrol station is wanted to coordinate, gas is sealed using high pressure lubricating oil, a small amount of lubricating oil is had and penetrates into expanding machine, and then adhere to downstream equipment On.In addition, the repair of mechanical seal short life unit, maintenance are frequently.Dry gas seals system complex, it is of high cost, it is needed during use A large amount of high pressure nitrogens are consumed, even if after compressor emergency shutdown, it is still desirable to which consumption high pressure nitrogen for a long time, operating cost is high, is suitble to It is used on powerful device more than MW class.
It, can be to the transmission & distribution gas in downstream after lubrication leakage enters natural gas line in addition, if generating set is using oil lubrication It impacts.
In natural gas pressure difference generating system, power pressure is high, and gas density is big so that unit is in the feelings for increasing mass flow Under condition, volume flow appoints right very little, and power density is very big.Current small flow expanding machine uses centripetal turbine more, but single-stage Centripetal turbine rotating speed is very high, and multistage centripetal turbine pipeline is complicated, and pipeline coupling flange is more, and potential leakage point is more.To vortex cordis Wheel is due to the limitation of impeller itself geometry, and when design is smaller to the accommodation of rotating speed, and the space for reducing rotating speed has very much Limit.So that generating unit speed is higher, power of motor is difficult to meet design requirement.
Organic Rankine Cycle (Organic Rankine Cycle abbreviation ORC) generates electricity to generate electricity with natural gas pressure difference, has very much Identical place.Working medium is all Hydrocarbon Organic, is required for that pressure energy is converted to electric energy, problem encountered using expanding machine It is basically identical.
In natural gas pressure difference generating system and ORC electricity generation systems, the operating pressure of expanding machine is all higher, most of unit work Make pressure all in megapascal grade.Since air pressure is higher, expanding machine axial thrust is all very big.Even if generated output 100kW's or so Unit, if do not adjusted specially to axial thrust, part of generating units axial thrust can reach 10000 Ns or more.If it adopts With the oil-free lubrications technology such as magnetic suspension or air suspension bearing, the axial thrust that unit can be born is very limited, it usually needs control For system at 1000 Ns hereinafter, so single go to reduce axial thrust from the angle of expanding machine blade design, can not often meet design will It asks.
In conclusion existing expanding machine is applied in natural gas and organic rankine cycle system, it is primarily present following several A problem:
1st, sealing problem;
2nd, lubricating oil pollutes working medium gas;
3rd, generating unit speed high reliability is poor;
4th, expanding machine axial thrust is all very big, and the axial thrust that unit can be born is very limited;
5th, short life, repair, maintenance are frequent;
6th, system complex, cost are high.
Utility model content
To solve problems of the prior art, the utility model provides a kind of two-stage cantilevered axis stream expanding machine, Expanding machine uses two-stage axial wheel, and suspension and motor both ends, are connected using cantilevered, with motor coaxle respectively.Utilize two-stage Axis stream can effectively reduce expanding machine rotating speed, promote the reliability and efficiency of motor, frequency converter, and obtain higher energy and turn Rate.Electric machine casing is cooled down using movable vane exit gas, promotes cooling efficiency.It, can be complete using Nonlubricated bearing Prevent lubricating oil to penetrate into pipeline, influence downstream installation, equipment.Unit no-rotary part is connected with the external world, only flange position Static seal is contacted with the external world, and the dynamic sealing not connect with the external world is, it can be achieved that working medium zero leakage.
The technical solution adopted in the utility model is:
A kind of two-stage cantilevered axis stream expanding machine, including first order expanding machine, second level expanding machine and motor;Described first Grade expanding machine includes air intake casing, first order nozzle ring and first order impeller of rotor;Second expanding machine includes unit casing Body, second level nozzle ring and second level impeller of rotor;The motor includes rotor and stator winding;The air intake casing with Unit casing body is oppositely arranged to form cavity, and the rotor is set on along the axle center of cavity in cavity, outside the rotor It is equipped with auxiliary thrust bearing shell, electric machine casing and second level diversion shell successively along air intake casing to the direction of unit casing body, it is described Rotor is coaxially arranged with first order input terminal close to the end face of air intake casing, and the rotor is close to unit casing body End face is coaxially arranged with second level input terminal, and the stator winding is installed on the inside of electric machine casing;The first order nozzle ring peace Loaded in air intake casing, the first order impeller of rotor is installed on first order input terminal;The second level nozzle ring is set on the In two level diversion shell, the second level impeller of rotor is set on the input terminal of the second level;The rotor is close to air intake casing One end be arranged with rotor propulsion disc and first order side journal bearing, the both sides of the rotor propulsion disc are equipped with thrust bearing, institute It states first order side journal bearing and is located at side of the rotor propulsion disc far from air intake casing, the rotor is close to unit casing body One end be arranged with second level side journal bearing;The one end of the air intake casing far from unit casing body is equipped with air inlet, described The one end of unit casing body far from air intake casing is equipped with gas outlet.
Using two-stage axis stream, expanding machine rotating speed can be effectively reduced, promotes the reliability and efficiency of motor, frequency converter, and Obtain higher energy transformation ratio.
Since the natural gas expansion power generation and ORC generating set powers density of high pressure are all very big, the machine of below 300kW Group rotating speed is all very high.Especially with single-stage centripetal turbine, ensureing that expanding machine is high performance, the rotating speed needed is non- Chang Gao so that motor is difficult to meet requirement.In order to ensure motor energy stable operation, need by sacrifice efficiency of expander come Rotating speed is reduced by force.Using the utility model, lower rotating speed can be used to obtain higher aeroperformance.
Unit stationary seal is connected with the external world, need to only be connect by flange with gas pipeline, it can be achieved that electricity generation system zero is let out Leakage, unit operation are safe and reliable.
Preferably, the thrust bearing is static-pressure air bearing, and the side of the unit casing body is equipped with and the thrust axis The air inlet of connection is held, the thrust bearing is equipped with the aperture for leading to rotor thrust side surface.
The high-pressure air source of thrust bearing input flows to rotor propulsion disc by the aperture on thrust bearing, forms air film, rises To the effect of gas lubrication.
In air-bearing operation process, rotatable parts are with stationary parts without being in direct contact, and friction loss is small, mechanical efficiency It is high.
The unit of the utility model uses oil-free lubrication, does not have lubricating oil and enters the circulatory system, working medium is polluted, And then influence upstream device.
Existing expanding machine mainly uses oil-lubricated bearing or magnetic suspension bearing.Oil-lubricated bearing unit is exported in expanding machine It needs just be fully solved natural gas leaking using expensive dry gas seals on axis.Dry gas seals are in addition to seal body, it is also necessary to multiple Miscellaneous control system, about 200,000 yuan of domestic dry gas seals/set, import it is more expensive.The utility model is without expensive dry gas Sealing.It is still cheaply many compared to dry gas seals although air-bearing compares oil-lubricated bearing cost higher.Using magnetic The unit of suspension bearing, although also without expensive dry gas seals, current magnetic suspension bearing is very expensive, and needs Professional carries out installation and debugging to scene, and cost is far above air-bearing.
Preferably, the bearing gas vent with being connected inside motor is additionally provided on the thrust bearing.
It is provided on thrust bearing towards the gas vent inside motor, the working medium gas that bearing is discharged is discharged into inside motor, used In cooling motor rotor magnetic steel.
Preferably, first order side journal bearing and second level side journal bearing are static pressure or kinetic pressure air-float bearing of inner.
To solve refrigerant leakage, prevent lubricating oil from entering natural gas, and reduce mechanical loss, motor bearings uses oil-free lubrication Gas suspension bearing, abbreviation air-bearing.Wherein thrust bearing uses static-pressure air bearing, and journal bearing uses static pressure or dynamic pressure Air-bearing.All inside housings, no any position contacts all rotatable parts of unit with external environment for sealing.
Preferably, it is machined with labyrinth sealing between the first order nozzle ring and first order impeller of rotor;The motor The middle part of rotor is equipped with magnet steel corresponding with stator winding, and the both ends of the rotor are hollow-core construction, and the first order is defeated Enter and through-hole is equipped at the axle center at end, which connects, and this is hollow with hollow space of the rotor close to air intake casing one end Partial side wall is equipped with multiple thrusts and adjusts gas vent, and the thrust adjusts gas vent and uniformly divides around the axle center of rotor Cloth.
Labyrinth sealing is machined between first order nozzle ring and first order impeller of rotor, with reference to first order input terminal and electricity The thrust of the hollow space of machine rotor adjusts gas vent and forms axial thrust regulating device, is pushed away for regulation motor rotor axial Power, and the gas that axial thrust regulating device is discharged is introduced inside motor, strengthens the cooling of motor rotor magnetic steel.
In rotor gas vent uniformly distributed on the side wall of the hollow space of air intake casing one end, rotor is in height Under speed rotation, the effect of pump gas is played, the working medium gas close to air intake casing one end is aspirated.By to be vented hole number, Aperture and the adjusting of eccentricity, can play different suction effects.Gas vent is in pumping, first order nozzle ring and the first order High pressure gas between impeller of rotor can be by the gap flow direction motor rotor between nozzle ring and impeller, so first order nozzle Sealing structure is installed between ring and first order impeller of rotor, the high pressure gas between nozzle ring and impeller is made to turn in flow direction motor The period of the day from 11 p.m. to 1 a.m, pressure decline, and the suction effect of gas vent is different, then the slippage of gas pressure is different.
Preferably, the rotor is cold equipped with multiple motors close to the side wall of the hollow space of unit casing body one end But gas vent, the motor cooling gas vent is uniformly distributed around the axle center of rotor, at the axle center of the second level input terminal Equipped with through-hole, which connects with hollow space of the rotor close to unit casing body one end.
Cooling gas cools down gas vent by motor inside motor, and outlet conduit is discharged to by the through-hole on the input terminal of the second level In.
Cavity between electric machine casing and unit casing body is flowed to the channel of the second level as working medium gas by the first order.
Preferably, there are multiple fins in the outside of the electric machine casing along its axially mounted or milling.
Heat exchange area is increased by fin, is radiated using first order outlet working medium gas to stator winding.Fin and electricity The axis direction of machine rotor is identical, can reduce the loss of working medium flow of air, and can play the role of rectification.
The beneficial effects of the utility model are:
1st, between unit and external environment stationary seal, it can be achieved that zero leakage;
2nd, unit uses oil-free lubrication, does not have lubricating oil and enters the circulatory system, working medium gas is polluted, and then influences Upstream device;
3rd, higher overall performance:Using the utility model, lower rotating speed can be used to obtain higher aeroperformance, In air-bearing operation process, for rotatable parts with stationary parts without being in direct contact, friction loss is small, and mechanical efficiency is high;
4th, lower working speed promotes unit reliability:Using the utility model, in the situation for ensuring aeroperformance Under, working speed is lower, can make unit operation in first-order flexure mode hereinafter, promoting unit reliability of operation;
5th, by gas vent uniformly distributed in hollow shaft, with reference to the sealing between nozzle ring and impeller, to reduce hub disk Static pressure, so as to reduce the axial thrust of rotor;
6th, control system is simple:Expanding machine axial thrust rises with inlet pressure and is increased, and close to proportional relation, use is swollen The working medium gas of swollen machine inlet pipeline is as bearing air source, and without complicated control system, bearing load carrying capacity is with inlet pressure Rise and increase automatically, enable unit normal operation under larger inlet pressure fluctuation;
7th, lower manufacture cost:The utility model is without expensive dry gas seals, although air-bearing is compared to oil Bearing cost higher is lubricated, but it is still cheaply many compared to dry gas seals;Using the unit of magnetic suspension bearing, although also not Expensive dry gas seals are needed, but current magnetic suspension bearing is very expensive, and professional is needed to be installed to scene Debugging, cost are far above air-bearing;
8th, service life is long:After unit reaches working speed, rotatable parts are not contacted with stationary parts, no abrasion, unit It can run all the year round.
Description of the drawings
Fig. 1 is the structure diagram of the utility model embodiment;
Fig. 2 is the structure diagram of Fig. 1 middle sections A;
Fig. 3 is the structure diagram of Fig. 2 middle sections B;
Reference numeral:11- first order nozzle rings, 12- first order impeller of rotor, 1112- labyrinth sealings, the 121- first order Input terminal, 13- air intake casings, 21- second level nozzle ring, 22- second level impeller of rotor, 221- second level input terminal, 23- units Outer housing, 31- rotors, 32- stator winding, 33- electric machine casings, the auxiliary thrust bearing shells of 34-, 35- thrust bearings, 36- first Grade side journal bearing, 37- cartridge housings, 38- second level diversion shell, 39- second level side journal bearing, 361- bearing gas vents, 311- rotor propulsion discs, 312- thrusts adjust gas vent, 313- motors cooling gas vent.
Specific embodiment
The embodiment of the utility model is described in detail below in conjunction with the accompanying drawings.
Embodiment
As shown in Figure 1 and Figure 2, a kind of two-stage cantilevered axis stream expanding machine, including first order expanding machine, second level expanding machine And motor;The first order expanding machine includes air intake casing 13, first order nozzle ring 11 and first order impeller of rotor 12;Described Two expanding machines include unit casing body 23, second level nozzle ring 21 and second level impeller of rotor 22;The motor turns including motor Son 31 and stator winding 32;The air intake casing 13 is oppositely arranged to form cavity with unit casing body 23, the rotor 31 It is set in cavity along the axle center of cavity, the 31 outer air intake casing 13 of rotor to the direction of unit casing body 23 is set successively There are auxiliary thrust bearing shell 34, electric machine casing 33 and second level diversion shell 38, the rotor 31 is close to the end of air intake casing 13 Face is coaxially arranged with first order input terminal 121, and the rotor 31 is coaxially arranged with close to the end face of unit casing body 23 Two level input terminal 221, the stator winding 32 are installed on 33 inside of electric machine casing;The first order nozzle ring 11 is installed on air inlet In housing 13, the first order impeller of rotor 13 is installed on first order input terminal 121;The second level nozzle ring 21 is set on the In two level diversion shell 38, the second level impeller of rotor 22 is set on second level input terminal 221;The rotor 31 is close One end of air intake casing 13 is arranged with rotor propulsion disc 311 and first order side journal bearing 36, first order side journal bearing 36 are externally provided with cartridge housing 37, the inside of electric machine casing 33 to be isolated with the end of rotor 31, the rotor propulsion disc 311 both sides are equipped with thrust bearing 35, and first order side journal bearing 36 is located at rotor propulsion disc 311 far from air intake casing 13 Side, the rotor 31 is arranged with second level side journal bearing 39, the motor close to one end of unit casing body 23 Housing 33 is equipped with the isolation part that extends to rotor 31 close to one end of unit casing body 23, to will be in electric machine casing 33 Portion is isolated with the end of rotor 31;The described one end of air intake casing 13 far from unit casing body 23 is equipped with air inlet, described The one end of unit casing body 23 far from air intake casing 13 is equipped with gas outlet.
Using two-stage axis stream, expanding machine rotating speed can be effectively reduced, promotes the reliability and efficiency of motor, frequency converter, and Obtain higher energy transformation ratio.
Since the natural gas expansion power generation and ORC generating set powers density of high pressure are all very big, the machine of below 300kW Group rotating speed is all very high.Especially with single-stage centripetal turbine, ensureing that expanding machine is high performance, the rotating speed needed is non- Chang Gao so that motor is difficult to meet requirement.In order to ensure motor energy stable operation, need by sacrifice efficiency of expander come Rotating speed is reduced by force.Using the utility model, lower rotating speed can be used to obtain higher aeroperformance.
Unit stationary seal is connected with the external world, need to only be connect by flange with gas pipeline, it can be achieved that electricity generation system zero is let out Leakage, unit operation are safe and reliable.
In one of the embodiments, the thrust bearing 35 be static-pressure air bearing, the one of the unit casing body 23 Side is equipped with the air inlet connected with the thrust bearing 35, and the thrust bearing 35, which is equipped with, leads to 311 end face of rotor propulsion disc Aperture.
The high-pressure air source of thrust bearing input flows to rotor propulsion disc by the aperture on thrust bearing, forms air film, rises To the effect of gas lubrication.
In air-bearing operation process, rotatable parts are with stationary parts without being in direct contact, and friction loss is small, mechanical efficiency It is high.
The unit of the utility model uses oil-free lubrication, does not have lubricating oil and enters the circulatory system, working medium is polluted, And then influence upstream device.
Existing expanding machine mainly uses oil-lubricated bearing or magnetic suspension bearing.Oil-lubricated bearing unit is exported in expanding machine It needs just be fully solved natural gas leaking using expensive dry gas seals on axis.Dry gas seals are in addition to seal body, it is also necessary to multiple Miscellaneous control system, about 200,000 yuan of domestic dry gas seals/set, import it is more expensive.The utility model is without expensive dry gas Sealing.It is still cheaply many compared to dry gas seals although air-bearing compares oil-lubricated bearing cost higher.Using magnetic The unit of suspension bearing, although also without expensive dry gas seals, current magnetic suspension bearing is very expensive, and needs Professional carries out installation and debugging to scene, and cost is far above air-bearing.
In another embodiment, the bearing gas vent with being connected inside motor is additionally provided on the thrust bearing 35 361。
It is provided on thrust bearing towards the gas vent inside motor, the working medium gas that bearing is discharged is discharged into inside motor, used In cooling motor rotor magnetic steel.
In another embodiment, first order side journal bearing 36 and second level side journal bearing 39 for static pressure or Kinetic pressure air-float bearing of inner.
To solve refrigerant leakage, prevent lubricating oil from entering natural gas, and reduce mechanical loss, motor bearings uses oil-free lubrication Gas suspension bearing, abbreviation air-bearing.Wherein thrust bearing uses static-pressure air bearing, and journal bearing uses static pressure or dynamic pressure Air-bearing.All inside housings, no any position contacts all rotatable parts of unit with external environment for sealing.
In another embodiment, it is machined with labyrinth between the first order nozzle ring 11 and first order impeller of rotor 12 Formula sealing 1112;The middle part of the rotor 31 be equipped with 32 corresponding magnet steel of stator winding, the two of the rotor 31 It holds as hollow-core construction, through-hole is equipped at the axle center of the first order input terminal 121, the through-hole is with rotor 31 close to gas inlet shell The hollow space connection of 13 one end of body, and the side wall of the hollow space is equipped with multiple thrusts and adjusts gas vent 312, the thrust It adjusts gas vent 312 to be uniformly distributed around the axle center of rotor 31, and the thrust adjusts gas vent 312 and is located at the outer of cartridge housing 37 Side.
Labyrinth sealing is machined between first order nozzle ring and first order impeller of rotor, with reference to first order input terminal and electricity The thrust of the hollow space of machine rotor adjusts gas vent and forms axial thrust regulating device, is pushed away for regulation motor rotor axial Power, and the gas that axial thrust regulating device is discharged is introduced inside motor, strengthens the cooling of motor rotor magnetic steel.
In rotor gas vent uniformly distributed on the side wall of the hollow space of air intake casing one end, rotor is in height Under speed rotation, the effect of pump gas is played, the working medium gas close to air intake casing one end is aspirated.As shown in figure 3, by row Stomata quantity, the adjusting of aperture Φ b and eccentricity a, can play different suction effects.Gas vent is in pumping, the first order High pressure gas between nozzle ring and first order impeller of rotor can by the gap flow direction motor rotor between nozzle ring and impeller, So being equipped with sealing structure between first order nozzle ring and first order impeller of rotor, make the high pressure gas between nozzle ring and impeller In flow direction motor rotor, pressure declines body, and the suction effect of gas vent is different, then the slippage of gas pressure is different.
In another embodiment, the rotor 31 is close to the side wall of the hollow space of 23 one end of unit casing body It being equipped with multiple motors and cools down gas vent 313, the motor cooling gas vent 313 is uniformly distributed around the axle center of rotor 31, And motor cooling gas vent 313 is located at the inside of isolation part, and through-hole is equipped at the axle center of the second level input terminal 221, it should Through-hole is connected with hollow space of the rotor 31 close to 23 one end of unit casing body.
Cooling gas cools down gas vent by motor inside motor, and outlet conduit is discharged to by the through-hole on the input terminal of the second level In.
Cavity between electric machine casing and unit casing body is flowed to the channel of the second level as working medium gas by the first order.
In another embodiment, there are multiple wings in the outside of the electric machine casing 33 along its axially mounted or milling Piece.
Heat exchange area is increased by fin, is radiated using first order outlet working medium gas to stator winding.Fin and electricity The axis direction of machine rotor is identical, can reduce the loss of working medium flow of air, and can play the role of rectification.
Embodiment described above only expresses specific embodiment of the present utility model, and description is more specific and detailed, But it should not be interpreted as limiting the scope of the present invention.It should be pointed out that for the common of this field For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to In the scope of protection of the utility model.

Claims (7)

1. a kind of two-stage cantilevered axis stream expanding machine, which is characterized in that including first order expanding machine, second level expanding machine and electricity Machine;The first order expanding machine includes air intake casing, first order nozzle ring and first order impeller of rotor;The second level expanding machine Including unit casing body, second level nozzle ring and second level impeller of rotor;The motor includes rotor and stator winding;Institute It states air intake casing to be oppositely arranged to form cavity with unit casing body, the rotor is set on along the axle center of cavity in cavity, institute Rotor outer air intake casing is stated to lead equipped with auxiliary thrust bearing shell, electric machine casing and the second level successively to the direction of unit casing body Housing is flowed, the rotor is coaxially arranged with first order input terminal close to the end face of air intake casing, and the rotor is close The end face of unit casing body is coaxially arranged with second level input terminal, and the stator winding is installed on the inside of electric machine casing;Described First order jet nozzle ring is installed in air intake casing, and the first order impeller of rotor is installed on first order input terminal;The second level Nozzle ring is set in the diversion shell of the second level, and the second level impeller of rotor is set on the input terminal of the second level;The rotor Rotor propulsion disc and first order side journal bearing are arranged with close to one end of air intake casing, the both sides of the rotor propulsion disc are equipped with Thrust bearing, first order side journal bearing are located at side of the rotor propulsion disc far from air intake casing, and the rotor leans on One end of nearly unit casing body is arranged with second level side journal bearing;The one end of the air intake casing far from unit casing body is equipped with Air inlet, the described one end of unit casing body far from air intake casing are equipped with gas outlet.
2. two-stage cantilevered axis stream expanding machine according to claim 1, which is characterized in that the thrust bearing is static pressure gas Floating axle is held, and the side of the unit casing body is equipped with the air inlet connected with the thrust bearing, and the thrust bearing is equipped with logical To the aperture of rotor thrust side surface.
3. two-stage cantilevered axis stream expanding machine according to claim 2, which is characterized in that be additionally provided on the thrust bearing With the bearing gas vent connected inside motor.
4. the two-stage cantilevered axis stream expanding machine according to Claims 2 or 3, which is characterized in that the first order side is radially Bearing and second level side journal bearing are static pressure or kinetic pressure air-float bearing of inner.
5. two-stage cantilevered axis stream expanding machine according to claim 3, which is characterized in that the first order nozzle ring with Labyrinth sealing is machined between first order impeller of rotor;The middle part of the rotor is equipped with magnetic corresponding with stator winding Steel, the both ends of the rotor are hollow-core construction, and through-hole, the through-hole and motor are equipped at the axle center of the first order input terminal Hollow space of the rotor close to air intake casing one end connects, and the side wall of the hollow space is equipped with multiple thrusts and adjusts exhaust Hole, the thrust adjust gas vent and are uniformly distributed around the axle center of rotor.
6. two-stage cantilevered axis stream expanding machine according to claim 5, which is characterized in that the rotor is close to unit The side wall of the hollow space of outer housing one end is equipped with multiple motors and cools down gas vent, and the motor cooling gas vent turns around motor The axle center of son is uniformly distributed, and through-hole is equipped at the axle center of the second level input terminal, the through-hole is with rotor outside unit The hollow space connection of shell one end.
7. two-stage cantilevered axis stream expanding machine according to claim 1, which is characterized in that the outside edge of the electric machine casing Its axially mounted or milling has multiple fins.
CN201721426727.1U 2017-10-31 2017-10-31 Two-stage cantilevered axis stream expanding machine Active CN207538866U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109611162A (en) * 2018-10-25 2019-04-12 北京康吉森节能环保技术有限公司 A kind of energy-saving steam turbine power generation unit to be generated electricity using low-pressure saturated steam
CN111486102A (en) * 2019-01-29 2020-08-04 青岛海尔智能技术研发有限公司 Centrifugal compressor and heat pump system
CN111486104A (en) * 2019-01-29 2020-08-04 青岛海尔智能技术研发有限公司 Centrifugal compressor and heat pump system
WO2022016666A1 (en) * 2020-07-23 2022-01-27 施炳根 Rotary turbojet fuel engine capable of performing work two times

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109611162A (en) * 2018-10-25 2019-04-12 北京康吉森节能环保技术有限公司 A kind of energy-saving steam turbine power generation unit to be generated electricity using low-pressure saturated steam
CN111486102A (en) * 2019-01-29 2020-08-04 青岛海尔智能技术研发有限公司 Centrifugal compressor and heat pump system
CN111486104A (en) * 2019-01-29 2020-08-04 青岛海尔智能技术研发有限公司 Centrifugal compressor and heat pump system
CN111486102B (en) * 2019-01-29 2022-06-14 青岛海尔智能技术研发有限公司 Centrifugal compressor and heat pump system
WO2022016666A1 (en) * 2020-07-23 2022-01-27 施炳根 Rotary turbojet fuel engine capable of performing work two times

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