CN209067293U - Gas-bearing expansion turbine - Google Patents
Gas-bearing expansion turbine Download PDFInfo
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- CN209067293U CN209067293U CN201821516922.8U CN201821516922U CN209067293U CN 209067293 U CN209067293 U CN 209067293U CN 201821516922 U CN201821516922 U CN 201821516922U CN 209067293 U CN209067293 U CN 209067293U
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Abstract
The utility model provides a kind of gas-bearing expansion turbine, it is related to machinery equipment field, central axis including shell and installation inside housings, the left and right sides of central axis length direction is separately installed with left gas bearing and right gas bearing, left gas bearing connects expanding machine by sealing jacket, and right gas bearing connects impeller of blower by sealing heat-insulating shield；It is provided on the outside of expansion wheel and turbine spiral case fixed on the left of shell, it is provided on the outside of impeller of blower and volute of blower fixed on the right side of shell, impeller of blower pilot seal lid is fixedly connected on the right side of volute of blower, sealing heat-insulating shield is internally provided with two radial through-hole, respectively as the import of room temperature sealing gas and instrument high-temp waste gas outlet；Impeller of blower pilot seal lid is internally provided with waterway channel, for being passed through recirculated cooling water；Temperature after impeller of blower can be effectively reduced in the utility model design, adapts to more high-revolving expanding machine, improves expansion efficiency, increases the operation adaptation range of expanding machine, has the stronger market competitiveness.
Description
Technical field
The utility model relates to machinery equipment field, and in particular to a kind of gas-bearing expansion turbine.
Background technique
Turbo-expander is the machine of cryogenic refrigeration, is the key that the mating single machine of air separation products, steel, smelting,
The industries such as petrochemical industry, glass have extensive utilization.Gas-bearing expansion turbine is most promising in turbo-expander
Product, it has many advantages, such as small in size, light-weight, cheap, high-efficient, convenient operating maintenance, also complies with national energy-saving and subtracts
The requirement of row.
Such as gas-bearing expansion turbine disclosed in ZL200810157098.6 Chinese utility model patent, including
One middle casing, left end installation turbine spiral case, the right end of the middle casing are equipped with volute of booster；The middle casing
It inside can be rotatably set rotor, be respectively arranged with expansion wheel and impeller of booster at the both ends of the rotor, covered on the rotor
If there are two gas bearing, for supporting expansion wheel and impeller of booster.It is simple compared to using the turbo-expander structure of oil bearing,
Axis loss is small, low in cost, has a safety feature, and can reduce the discharge of oil and gas in oil bearing expanding machine, reduces to ring
The pollution in border.
In production application, gas-bearing expansion turbine is used as carrying diameter axial load using gas bearing, right
The accuracy of manufacture of bearing and installation gap have very high requirement, its general radial fit total backlash only has 0. more than zero milli
Rice axially engages total backlash and also there was only 0. more than zero millimeter, when braking power only has within 50 kilowatts, the braking of expanding machine
End is generally used blower braking, and not only structure is simple in this way, and Operation and Maintenance is also very convenient.
Swell increment is to measure the important parameter of efficiency of expander, and swell increment is bigger, and expanding machine overall refrigerating effect is also bigger；It is practical
It is general using the expanding end import tolerance for increasing expanding machine in production, promoted expansion wheel and blower wheel speed mode increase it is swollen
Bulk, but expansion wheel and blower wheel speed are excessively high, and blower braked wheel can be caused further to do work and consume mechanical energy, in fan end
Heat unable to disperse in time can make the temperature of fan end increase rapidly, cause blower wheel speed that cannot further be promoted, nothing
Method realizes the technical effect for increasing swell increment；Such as when impeller of blower revolving speed reach 90,000 turns even more than when, on the one hand can be in expanding machine
Very big pressure difference is generated between fan end and internal bearings side, is easy to happen accident；On the other hand, due to blower wheel speed compared with
Height increases acting and generates more heats, and then causes impeller of blower outlet temperature higher than inlet temperature when can fan end be braked
100 DEG C even more than, impeller of blower remains lower revolving speed at this time, so that expansion wheel can not also improve revolving speed, not can increase
Expander amount.
Prior art can be only applied to the gas bearing expanding machine that dog point temperature rise is usually no more than 50 DEG C, high-temperature
If gas flow at bearing, the inner hole of bearing will be made to expand, fit clearance can also change, and bearing capacity subtracts significantly
Low, especially when radial total backlash reaches 0.10 millimeter or more, antiwhip can will deteriorate significantly, the rigidity of bearing
It can decline, while central axis can be made to generate strong surge, it is easy to so that central axis is in contact and is burnt out with bearing, to make
Complexes parking, generates very huge economic loss.In addition, high-temperature gas flow into bearing also result in bearing occur it is axial swollen
It is swollen, so that axial total backlash is become smaller, the flow for causing bearing gas to enter becomes smaller, and axial carrying capacity can also decline.
Utility model content
The utility model aim is to provide a kind of gas-bearing expansion turbine, and structure is simple, saves cost, operation is more
Securely and reliably, the expanding machine braking when dog point temperature rise is no more than 120 DEG C can effectively be applied.
To reach above-mentioned purpose, the utility model proposes following technical solutions: a kind of gas-bearing expansion turbine, including
The central axis of shell and installation inside housings, the left and right sides of central axis length direction are separately installed with left gas bearing and right gas
Body bearing；The left gas bearing support connection expanding machine, and it is exhausted that sealing is equipped between the left gas bearing and expansion wheel
Hot jacket；It is provided on the outside of the expansion wheel and turbine spiral case fixed on the left of shell；The right gas bearing support connection blower
Wheel, and sealing heat-insulating shield is equipped between the right gas bearing and impeller of blower；It is provided on the outside of the impeller of blower and the shell right side
The fixed volute of blower in side, the volute of blower right side are fixedly connected with impeller of blower pilot seal lid；
The sealing heat-insulating shield is internally provided with radial through-hole, including the first radial through-hole and the second radial through-hole, described
First radial through-hole is passed through gas at normal temperature, and the pressure of gas at normal temperature is greater than the gas pressure intensity after impeller of blower, therefore can be used for close
Envelope mixing reduces the heat exchange of high-temperature gas and right gas bearing and volute of blower along the high-temperature gas of central axis axial leakage, mixes
Gas is closed to flow out from the second radial through-hole；
The impeller of blower pilot seal lid is internally provided with waterway channel, and the waterway channel is used for, and circulation is passed through cooling
Water, the cooling water is for the high-temperature brake gas converting heat with impeller outlet.
Further, the central axis is adapted to position and is provided with labyrinth teeth with sealing jacket and sealing heat-insulating shield；Institute
It states the labyrinth teeth on central axis to be used to carry out throttling cooling to the high-temperature gas that expansion wheel and impeller of blower export, so that last stream reaches
The temperature of the gas in impeller of blower Dorsal root portion is minimized.
Further, thickness note of the sealing heat-insulating shield in expansion side to the blower side along gas-bearing expansion turbine
For D, 20mm≤D≤30mm, it is possible to reduce temperature rise caused by thermally conductive；The flow of the impeller of blower is denoted as Q, 1000Nm3/h≤Q≤
1200Nm3Impeller of blower import and export caliber is generally respectively increased a grade by conventional flow velocity caliber to increase blower in turn by/h
Amount reduces the economic velocity that conventional pipeline allows, improves the negotiability of brake gas, reduces flow resistance, especially can be with
Using bigbore fan filter, the duty cycle of blower is improved, improves expanding machine reliability of operation.
Further, the shell is fixed with the volute of blower using connecting stud, and between the two contact face
It is provided with expoxy glass thermal insulation board；Connecting stud end between the shell, volute of blower, right gas bearing and sealing heat-insulating shield
Face is provided with expoxy glass insulation end circle, and height can be effectively reduced in the expoxy glass thermal insulation board and expoxy glass insulation end circle
Heattransfer effect of the wet body to shell.
Further, several gas vents are provided on the sealing plate of the impeller of blower back, middle setting compared to the prior art
One gas vent increases to several in turn, for reducing flow of the high-temperature gas along axial leakage at bearing.
Further, the material of the sealing jacket and sealing heat-insulating shield is epoxy resin bonded fiber, epoxy resin bonded fiber
Thermal coefficient there was only the 1/5 of stainless steel material, therefore conduction effect caused by high-temperature gas can be effectively reduced.
From the above technical scheme, the gas-bearing expansion turbine that the technical solution of the utility model provides obtains
It is following the utility model has the advantages that
The utility model discloses a kind of gas-bearing expansion turbines that can be applied to dog point temperature rise and be more than 50 DEG C, have
Effect solves the phenomenon that can not being promoted due to the excessively high caused swell increment of blower dog point temperature；The gas bearing booster expansion machine
Mainly it is internally provided with by the sealing heat-insulating shield setting ventilation through-hole in impeller of blower brake side and in impeller of blower pilot seal lid
Circulating cooling aquaporin carries out the heat exchange of blower side, auxiliary by increasing thermal insulation board and adding the modes such as gas vent, reduce wind
The high-temperature gas heattransfer effect of wheel back, and then reduce bearing caused by fuel factor of the high-temperature gas heat transfer to bearing and consume, drop
The temperature rise of low fan end improves the temperature limit of expanding machine, guarantees expanding machine reliability of operation and security performance.
By using the structure of the utility model, the inlet and outlet temperature rise of fan end brake gas is at least reduced by 30 DEG C, a side
Face increases expander ratio, reduces expansion series, it can the expanding machine of high revolving speed, high expansion ratio is more by needing originally
The scheme of grade expansion is simplified to single-stage expansion；On the other hand, pass through the waterway channel of the utility model and room temperature blanket gas channel
The temperature rise for reducing blower side bearing, is effectively ensured bearing stability；Also, the utility model design expanding machine structure can adapt to
More high-revolving expanding machine, effectively improves expansion efficiency, further increases the swell increment and operation adaptation range of expanding machine.
In addition, replacing the expanding machine of oil bearing using gas bearing, design is more optimized, and not will cause oil and bring work into
Serious safety accident is caused in skill gas, simplifies the mechanical structure of expanding machine, saves 1/2 or more cost, and more
Supernumerary segment energy；And the phenomenon that air is polluted to the discharge of atmosphere using oil and gas in oil bearing expanding machine can be eliminated, elimination pair
Green harmonious industrialization is accomplished in the pollution of environment；It is further substituted part oil bearing expanding machine simultaneously, cost is saved, also has
The advantages that small in size, light-weight, convenient operating maintenance, improve the competitiveness of product in market.
It should be appreciated that as long as aforementioned concepts and all combinations additionally conceived described in greater detail below are at this
It can be viewed as a part of the utility model theme of the disclosure in the case that the design of sample is not conflicting.
The foregoing and other side of the utility model introduction can be more fully appreciated from the following description in conjunction with attached drawing
Face, embodiment and feature.The features and/or benefits of other additional aspects such as illustrative embodiments of the utility model
To be obvious in the following description, or will be learnt in the practice by the specific embodiment instructed according to the utility model.
Detailed description of the invention
Attached drawing is not intended to drawn to scale.In the accompanying drawings, identical or nearly identical group each of is shown in each figure
It can be indicated by the same numeral at part.For clarity, in each figure, not each component part is labeled.
Now, by by example and be described in reference to the drawings the utility model various aspects embodiment, in which:
Fig. 1 is the utility model expanding machine perspective view；
Fig. 2 is the utility model expander side to blower sectional view；
Fig. 3 is the concrete structure diagram for sealing heat-insulating shield.
(a) is that Fig. 3 seals the direction heat-insulating shield A-A sectional view in Fig. 4；(b) direction heat-insulating shield B-B sectional view is sealed for Fig. 3.
In figure, the specific meaning that respectively marks are as follows:
1- shell, the left gas bearing of 2-, the right gas bearing of 3-, 4- expansion wheel, 5- seal jacket, 6- turbine spiral case, 7-
Impeller of blower, 8- sealing heat-insulating shield, 9- volute of blower, 10- impeller of blower pilot seal lid, 11- radial through-hole, 12- waterway channel,
13- mat insulation, 14- central axis, 15- connector sleeve, 16- washer；A- expands gas import, and b- expands gas and exports, c- fan air inlet,
D- blower gas outlet, e- bearing gas air inlet, f- expanding end blanket gas air inlet, g- speed head interface, i- expander inlet pressure
Power, j- outlet pressure of expansion machine, pressure after k- air deflector, l- fan end room temperature blanket gas import, m- impeller of blower carry on the back gas discharge
Mouthful, n- water inlet, o- water outlet.
Specific embodiment
In order to know more about the technology contents of the utility model, spy lifts specific embodiment and institute's accompanying drawings is cooperated to be described as follows.
It is described with reference to the various aspects of the utility model in the disclosure, shown in the drawings of the implementation of many explanations
Example.It is not intended to cover all aspects of the utility model for embodiment of the disclosure.It should be appreciated that a variety of structures presented hereinbefore
Think and embodiment, and those of describe in more detail below design and embodiment can in many ways in any one
Implement, this is because conception and embodiment disclosed in the utility model are not limited to any embodiment.In addition, this is practical
Novel disclosed some aspects can be used alone, or with it is disclosed by the utility model it is otherwise it is any it is appropriately combined come
It uses.
Based on the swell increment in the prior art, promoting expanding machine, so that expander wheel 4 and 7 revolving speed of impeller of blower increase
Add, caused blower side temperature greatly improves, and then the phenomenon that cause expander amount that can not increase, is primarily due to work as wind
It is more than 100 DEG C that pusher side, which imports and exports the temperature difference, and expanding machine internal bearings fit clearance is easy to cause to increase, and then causes expanding machine unstable
It is fixed, the problem of causing bearing to consume, reduce bearing load carrying capacity, therefore the utility model provide it is a kind of it is safe, operation is steady
Fixed gas-bearing expansion turbine not only solves the problems, such as that blower side temperature rise caused by as increasing swell increment is excessively high, moreover it is possible into
One step increases the swell increment of expanding machine, improves expansion efficiency.
Referring to figs. 1 and 2, a kind of gas-bearing expansion turbine, including shell 1 and be mounted in 1 inside of shell
Mandrel 14, the 14 length direction two sides of central axis are separately installed with left gas bearing 2 and right gas bearing 3；The left gas
The support connection expanding machine 3 of bearing 1, and sealing jacket 5 is equipped between the left gas bearing 2 and expansion wheel 4；The expansion
3 outside of wheel is provided with and turbine spiral case 6 fixed on the left of shell 1；The support of the right gas bearing 3 connection impeller of blower 7, and it is described
Right gas bearing 3 and impeller of blower 7 between be equipped with sealing heat-insulating shield 8；It is provided on the outside of the impeller of blower 7 and consolidates on the right side of shell 1
Fixed volute of blower 9 is fixedly connected with impeller of blower pilot seal lid 10 on the right side of the volute of blower 9.
In order to reduce fan end high temperature caused by expander amount increases to the fuel factor of right gas bearing 3, cause pair
On the one hand the consume of right gas bearing 3 is internally provided with radial through-hole 11 in the sealing heat-insulating shield 8, including the first radial direction is led to
Hole and the second radial through-hole, first radial through-hole are passed through room temperature sealing gas, and the pressure of room temperature sealing gas is greater than blower
Gas pressure intensity after wheel 7, therefore can be used for sealing the high-temperature gas that mixing is leaked along rotor axial, reduce high-temperature gas and the right side
The heat exchange of gas bearing 3 and volute of blower 9, the gaseous mixture for being mixed with instrument high-temp waste gas later are discharged from the second radial through-hole,
It is radial from second to carry on the back remaining dead gas in dead gas channel for impeller of blower 7 when gaseous mixture can be installed with walking apparatus simultaneously in exclusion process
Through-hole excludes；On the other hand, the impeller of blower pilot seal lid 10 is internally provided with waterway channel 12, the waterway channel 12
Circulation is passed through cooling water, the high-temperature brake gas that the outer wall contact impeller of blower 7 of waterway channel 12 exports, high-temperature brake gas and water
Circulating cooling hydrothermal exchange in paths 12 reaches the technical effect for reducing the high-temperature brake gas temperature that impeller of blower 7 exports.
Particular for certain more high-revolving expanding machines, it can be passed through the chilled water of low temperature, using circulation to reduce the height after impeller of blower 7
The temperature of warm brake gas expands the use scope of gas bearing expanding machine significantly.
In conjunction with shown in Fig. 3, Fig. 4, in section Example, in order to further reduce effect of conducting heat caused by fan end high temperature
It answers, is provided with labyrinth toothing for adapting position is installed with sealing jacket 5 and sealing heat-insulating shield 8 on the central axis 14；
The labyrinth toothing makes the high-temperature gas through gas at normal temperature heat exchange of 7 side of impeller of blower in axial direction enter right gas axis
When holding 3, throttling cooling is carried out by each labyrinth teeth, so that the gas temperature of last stream up to right gas bearing 3 is further
It reduces, reduces the increase in gas bearing gap and the temperature rise of bearing, it is ensured that the stability of right gas bearing 3.
In addition, the sealing jacket 5 and the material for sealing heat-insulating shield 8 are epoxy glass fabric in embodiment shown in FIG. 1
Plate, the thermal coefficient of epoxy resin bonded fiber only have the 1/5 of stainless steel material, therefore can be effectively reduced and lead caused by high-temperature gas
Fuel factor, but the utility model does not limit sealing jacket 5 and seals the material of heat-insulating shield 8, can reach above-mentioned technical effect
Material it is within the protection scope of the present utility model.
In some embodiments, also by using the thickening sealing heat-insulating shield 8 along the swollen of gas-bearing expansion turbine
The mode of the thickness of swollen side to blower side, or improve the mode of the inlet and outlet caliber of the impeller of blower 7, one or two kinds of modes
And it deposits to reduce the heattransfer effect of fan end high temperature；Wherein, in embodiment shown in FIG. 1, the sealing heat-insulating shield 8 is in blower side
It is denoted as D, 20mm≤D≤30mm to the thickness of expansion side, the inlet and outlet caliber of the impeller of blower 7 increases accordingly several grades, such as
The inlet and outlet caliber of impeller of blower 7 is respectively set to DN100 and DN80；Compared to the prior art, heat-insulating shield 8 is sealed by improving
Length also with reduce it is thermally conductive caused by temperature rise；Improve impeller of blower 7 inlet and outlet caliber, can reduce conventional pipeline allow through
Help flow velocity, improves the negotiability of brake gas, reduces flow resistance, can especially use bigbore fan filter,
The duty cycle for improving blower strengthens 4 reliability of operation of expansion wheel；In above-described embodiment, impeller of blower 7 is by a series of
Pair structure improve, the 700Nm of the flow Q of impeller of blower 7 from current generally flow3/ h is increased to 1000Nm3/ h~1200Nm3/h
Between.
Further in conjunction with specific embodiments, also by the shell 1 and the volute of blower 9 using connecting stud and
Connector sleeve 15 is fixed, and expoxy glass thermal insulation board is provided between the two contact face；The shell 1, volute of blower 9, the right side
Connecting stud end face between gas bearing 3 and sealing heat-insulating shield 8 is provided with expoxy glass insulation end circle 13, the sealing insulation
Washer 16 is additionally provided between plate 8 and impeller of blower 7；The expoxy glass thermal insulation board, expoxy glass insulation end circle 13 and washer 16
High-temperature gas can be effectively reduced to the heat-transfer effect of shell, reason is that the thermal coefficient of epoxy resin bonded fiber only has stainless steel
The 1/5 of material, therefore conduction effect caused by high-temperature gas can be effectively reduced.
And in some embodiments, several gas vents are provided on the sealing plate of the impeller of blower 7 back, shown in attached drawing
Embodiment on sealing plate be arranged 3 gas vents, compared to the prior art in setting one gas vent can effectively reduce
Flow of the high-temperature gas along axial leakage at bearing further decreases the heat affecting to right gas bearing 3.
By booting up experiment to expander device in embodiment shown in the drawings, as a result, it has been found that, fan end brakes gas
Body inlet and outlet temperature rise at least reduces by 30 DEG C, and tests discovery and further increase swell increment, it can also be ensured that the temperature rise of blower side exists
The limit of temperature rise that device allows；Therefore the expanding machine of the utility model not only increases expander ratio, reduces expansion series,
The swell increment and range of operation that expanding machine can also be further increased, effectively improve expansion efficiency；The gas axis of the utility model
It holds turbo-expander in production, part oil bearing expanding machine can be replaced, save manufacturing cost, also have small in size, again
The advantages that amount is light, convenient operating maintenance, improves the competitiveness of product in market.
Although the utility model has been disclosed with preferred embodiment as above, so it is not intended to limit the utility model.This reality
It is without departing from the spirit and scope of the utility model, each when that can make with novel those of ordinary skill in the art
Kind changes and retouches.Therefore, the protection scope of the utility model is subject to view those as defined in claim.
Claims (9)
1. a kind of gas-bearing expansion turbine including shell (1) and is mounted on the internal central axis (14) of shell (1), described
The two sides of central axis (14) length direction are separately installed with left gas bearing (2) and right gas bearing (3)；The left gas bearing
(2) support connection expansion wheel (4), and sealing jacket (5) is equipped between the left gas bearing (2) and expansion wheel (4)；Institute
It states and is provided with turbine spiral case (6) on the outside of expansion wheel (4), the turbine spiral case (6) passes through fixed on the left of connector sleeve and shell (1)；
Right gas bearing (3) support connection impeller of blower (7), and be equipped between the right gas bearing (3) and impeller of blower (7) close
It seals heat-insulating shield (8)；It is provided with volute of blower (9) on the outside of the impeller of blower (7), it is right with shell (1) on the left of the volute of blower (9)
Side is fixed, fixed with impeller of blower pilot seal lid (10) on the right side of the volute of blower (9), which is characterized in that the sealing insulation
Plate (8) is internally provided with radial through-hole (11), including the first radial through-hole and the second radial through-hole, first radial through-hole and
Second radial through-hole is respectively as room temperature sealing gas air inlet and instrument high-temp waste gas exhaust outlet；
The impeller of blower pilot seal lid (10) is internally provided with waterway channel (12), and the waterway channel (12) is logical for recycling
Enter cooling water.
2. gas-bearing expansion turbine according to claim 1, which is characterized in that the central axis (14) and sealing are exhausted
Hot jacket (5) adaptation position is provided with labyrinth teeth.
3. gas-bearing expansion turbine according to claim 1, which is characterized in that the central axis (14) and sealing are exhausted
Hot plate (8) adaptation position is provided with labyrinth teeth.
4. gas-bearing expansion turbine according to claim 3, which is characterized in that the sealing heat-insulating shield (8) is on edge
The thickness of expansion side to the blower side of expanding machine is denoted as D, 20mm≤D≤30mm.
5. gas-bearing expansion turbine according to claim 1, which is characterized in that the shell (1) and the blower
Spiral case (9) is fixed using connecting stud, and expoxy glass thermal insulation board is provided between the two contact face.
6. gas-bearing expansion turbine according to claim 5, which is characterized in that the shell (1), volute of blower
(9), the connecting stud end face between right gas bearing (3) and sealing heat-insulating shield (8) is provided with expoxy glass insulation end circle
(13)。
7. gas-bearing expansion turbine according to claim 1, which is characterized in that the flow of the impeller of blower (7) is remembered
For Q, 1000Nm3/h≤Q≤1200Nm3/h。
8. gas-bearing expansion turbine according to claim 7, which is characterized in that impeller of blower (7) sealing backside
Several gas vents are provided on plate.
9. gas-bearing expansion turbine according to claim 1, which is characterized in that the sealing jacket (5) and close
The material for sealing heat-insulating shield (8) is epoxy resin bonded fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821516922.8U CN209067293U (en) | 2018-09-17 | 2018-09-17 | Gas-bearing expansion turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821516922.8U CN209067293U (en) | 2018-09-17 | 2018-09-17 | Gas-bearing expansion turbine |
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| Publication Number | Publication Date |
|---|---|
| CN209067293U true CN209067293U (en) | 2019-07-05 |
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ID=67092616
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| CN201821516922.8U Active CN209067293U (en) | 2018-09-17 | 2018-09-17 | Gas-bearing expansion turbine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109113809A (en) * | 2018-09-17 | 2019-01-01 | 苏州制氧机股份有限公司 | Gas-bearing expansion turbine |
| CN114483213A (en) * | 2022-01-26 | 2022-05-13 | 杭州新亚低温科技有限公司 | Large-flow cryogenic gas bearing turboexpander |
-
2018
- 2018-09-17 CN CN201821516922.8U patent/CN209067293U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109113809A (en) * | 2018-09-17 | 2019-01-01 | 苏州制氧机股份有限公司 | Gas-bearing expansion turbine |
| CN114483213A (en) * | 2022-01-26 | 2022-05-13 | 杭州新亚低温科技有限公司 | Large-flow cryogenic gas bearing turboexpander |
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