CN113107873B - Centrifugal compression method for electronic high-purity gas - Google Patents
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- CN113107873B CN113107873B CN202110511157.0A CN202110511157A CN113107873B CN 113107873 B CN113107873 B CN 113107873B CN 202110511157 A CN202110511157 A CN 202110511157A CN 113107873 B CN113107873 B CN 113107873B
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000007906 compression Methods 0.000 title claims abstract description 32
- 230000006835 compression Effects 0.000 title claims abstract description 30
- 239000007789 gas Substances 0.000 claims abstract description 77
- 238000009423 ventilation Methods 0.000 claims abstract description 12
- 238000002955 isolation Methods 0.000 claims abstract description 11
- 239000011261 inert gas Substances 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 7
- 230000003746 surface roughness Effects 0.000 claims description 5
- 238000005273 aeration Methods 0.000 claims description 3
- 238000005238 degreasing Methods 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 2
- 238000005192 partition Methods 0.000 claims description 2
- 238000007517 polishing process Methods 0.000 claims 1
- 230000003749 cleanliness Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 7
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000012993 chemical processing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
- F04D17/12—Multi-stage pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/102—Shaft sealings especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a centrifugal compression method for electronic high-purity gas, wherein the electronic high-purity process gas enters the interior of a compressor main body through an air inlet of the compressor main body, passes through an interstage baffle by high-speed rotation of a rotor, enters a next-stage impeller channel by stage for pressurization, and is discharged through an exhaust port; a primary shaft seal, a secondary shaft seal, a tertiary shaft seal and an isolation shaft seal are symmetrically and sequentially sleeved at two ends of the rotor outwards; two primary shaft seals at two ends of the rotor are communicated through a balance pipe; when the compressor main body works, ultra-high-purity mixed gas is introduced into the first-stage shaft seal, high-purity gas is introduced into the second-stage shaft seal, mixed gas is introduced into the third-stage shaft seal, and inert gas passes through the isolation shaft seal; the ventilation pressure of the first-stage shaft seal is greater than that of the second-stage shaft seal and greater than that of the third-stage shaft seal. The invention solves the problem that the ultra-pure gas cannot be compressed cleanly due to the cleanliness problem.
Description
Technical Field
The invention relates to the technical field of electronic grade polycrystalline silicon production, in particular to a centrifugal compression method for electronic high-purity gas.
Background
In the field of producing 11N electronic grade polycrystalline silicon, due to market demands, the method has extremely high requirements (11N) on the purity of partial products, and on the basis of the application, the method provides more severe purity requirements on corresponding production, operation, filling and transportation packaging equipment. Due to production requirements, various process gas compressors are subsequently used to produce 11N electronic grade polysilicon, in an effort to deliver high purity hydrogen gas in a pressurized cycle.
The main devices of modern gas in the field of compression delivery are diaphragm compressors, reciprocating compressors and centrifugal compressors. The conveying of high-purity media is limited by the structure, the compression ratio of the diaphragm compressor is high, but the flow rate is low, and the production requirement of a large-batch production process cannot be met. The reciprocating compressor generates particles due to the friction motion of a piston/cylinder barrel in the operation process, pollutes the quality/purity of high-purity gas, and the traditional centrifugal compressor is only applied to the fields of petrochemical industry, conventional fine chemical industry and inorganic chemical industry production at present. The existing centrifugal compressor shaft seal is influenced by the sealing performance, dry gas sealing is adopted, the dry gas sealing introduces gas of a unit, the unit is easy to circularly pollute, and combustible and pyrophoric gas overflows to cause safety accidents.
Therefore, how to provide a centrifugal compression method capable of achieving high-purity electronic grade industrial gas compression is a problem which needs to be solved urgently by the technical personnel in the field.
Disclosure of Invention
In view of the above, the present invention provides a centrifugal compression method for electronic high-purity gas, which aims to solve the above technical problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a centrifugal compression method for high-purity gas of electrons, the high-purity process gas for electrons enters the interior of a compressor main body through an air inlet of the compressor main body, enters a next-stage impeller channel through an interstage baffle by high-speed rotation of a rotor for gradual pressurization, and is discharged through an air outlet; the two ends of the rotor are symmetrically sleeved with a primary shaft seal, a secondary shaft seal, a tertiary shaft seal and an isolation shaft seal in sequence outwards; two primary shaft seals at two ends of the rotor are communicated through a balance pipe; when the compressor main body works, ultra-high-purity mixed gas is introduced into the first-stage shaft seal, high-purity gas is introduced into the second-stage shaft seal, mixed gas is introduced into the third-stage shaft seal, and inert gas passes through the isolation shaft seal; the ventilation pressure of the first-stage shaft seal is greater than that of the second-stage shaft seal and that of the third-stage shaft seal is greater than that of the isolation shaft seal.
Through the technical scheme, the problems of low flow and secondary pollution in the field of high-purity gas process compression and pressure rise are solved from the details of optimization equipment by adjusting multiple aspects of shaft seal arrangement, gas introduction control, pressure control and the like, the production cleanness of polycrystalline silicon products is ensured, and the problem that the ultra-pure gas cannot be compressed cleanly due to the cleanness problem is solved.
Preferably, in the centrifugal compression method for electronic high-purity gas, the rotor is sleeved with a balance disc positioned at the end head of the compressor main body, and the balance disc is positioned between the inner cavity of the compressor main body and the primary shaft seal. For equalizing the internal pressure.
Preferably, in the centrifugal compression method for electronic high-purity gas, the maximum aeration pressure of the primary shaft seal is 0.3MPa, and the maximum inlet flow rate is 20Nm 3 H is used as the reference value. Can meet the sealing requirement.
Preferably, in the above centrifugal compression method for electronic high purity gas, the maximum leakage pressure of the primary shaft seal is 0.1MPa and the maximum leakage flow rate is 30Nm 3 H; the maximum leakage pressure of the secondary shaft seal is 0.2MPa, and the maximum leakage flow is 30Nm 3 H; the maximum leakage pressure of the three-stage shaft seal is 0.1MPa, and the maximum leakage flow is 30Nm 3 H is used as the reference value. Can meet the sealing requirement.
Preferably, in the above centrifugal compression method for electronic high purity gas, the inter-stage partition plate in contact with the high purity gas inside the compressor main body is connected by bolts; the bolt is axially provided with a through ventilation hole. The ventilation of the compressor inner cylinder connecting fastener can be changed by arranging the ventilation holes, and the problem of dead angles of replacement is solved.
Preferably, in the above-mentioned one centrifugal compression method for electronic high-purity gas, the number of stages of the compressor main body is 1 to 12 stages. The flow of the compressor can reach 5000-200000m 3 H, the lifting pressure is 0.1-2.0MPa.
Preferably, in the above centrifugal compression method for electronic high purity gas, the gas supply system is connected through EP grade metal piping, flanges and unions. The medium in the compressor main body is ensured not to leak and be polluted by the outside during the operation.
Preferably, in the centrifugal compression method for electronic high-purity gas, the surface of the inner flow passage of the compressor main body is polished by metal polishing processing technology, and the surface roughness Ra is less than or equal to 1.6. The metal polishing technology is processing of grinding and precise grinding after conventional machining, and reduces the surface roughness of a process medium flow component and meets the use requirement of an electronic grade by mechanical processing and chemical processing methods.
Preferably, in the centrifugal compression method for electronic high-purity gas, degreasing and rust removal are performed when the components are assembled, and sealing grease special for high-purity clean gas is applied to the sliding O-ring installation part for sleeving.
Compared with the prior art, the centrifugal compression method for the electronic high-purity gas has the following beneficial effects that:
1. according to the invention, through the multi-stage arrangement of the shaft seal, the regulation is carried out in multiple aspects such as gas control and pressure control, the problem of low flow and secondary pollution in the field of high-purity gas process compression and pressure boosting is improved from the details of optimized equipment, the production cleanness of polycrystalline silicon products is ensured, and the problem that the clean compression of ultra-pure gas cannot be carried out due to the cleanness problem is solved.
2. The invention reduces the surface roughness of the process medium flow passage component and meets the use requirement of an electronic grade by mechanical processing and chemical processing methods on the basis of the basic structure of the existing centrifugal compressor.
3. The invention changes the tightness or ventilation of the connecting fastener of the compressor inner cylinder, namely the bolt, and improves the problem of replacing dead angles.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an overall device provided by the present invention;
fig. 2 is a schematic structural diagram of a bolt provided by the invention.
Wherein:
1-a compressor body; 2-an air inlet; 3-a rotor; 4-interstage separator; 5-an exhaust port; 6-first-stage shaft seal; 7-secondary shaft seal; 8-third-stage shaft seal; 9-isolating shaft seal; 10-a balance tube; 11-a balance disc; 12-a bolt; 13-ventilation holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the attached drawings 1 and 2, the embodiment of the invention discloses a centrifugal compression method for electron high-purity gas, wherein the electron high-purity process gas enters the interior of a compressor main body 1 through a gas inlet 2 of the compressor main body 1, passes through an interstage diaphragm 4 by high-speed rotation of a rotor 3, enters a next-stage impeller channel by stage for pressurization, and is discharged through a gas outlet 5; the two ends of the rotor 3 are symmetrically and sequentially sleeved with a primary shaft seal 6, a secondary shaft seal 7, a tertiary shaft seal 8 and an isolation shaft seal 9 outwards; two primary shaft seals 6 at two ends of the rotor 3 are communicated through a balance pipe 10; when the compressor main body 1 works, ultra-high-purity mixed gas is introduced into the first-stage shaft seal 6, high-purity gas is introduced into the second-stage shaft seal 7, mixed gas is introduced into the third-stage shaft seal 8, and inert gas passes through the isolation shaft seal 9; the ventilation pressure of the primary shaft seal 6 is greater than that of the secondary shaft seal 7 and that of the tertiary shaft seal 8 is greater than that of the isolation shaft seal 9.
In order to further optimize the technical scheme, ultra-high-purity mixed gas is introduced into the primary shaft seal 6, and the ultra-high-purity mixed gas is ultra-high-purity electronic gas, such as hydrogen and silane mixed gas, conveyed in the compressor 1; the introduction of the high-purity gas into the secondary shaft seal 7 means that the high-purity gas which is easy to prepare, such as high-purity hydrogen, is introduced; mixed gas is introduced into the third-stage shaft seal 8, mainly nitrogen and sealing gas hydrogen which is connected in series with the second-stage shaft seal 7 to form mixed gas.
In order to further optimize the technical scheme, a balance disc 11 positioned at the end head of the compressor main body 1 is sleeved on the rotor 3, and the balance disc 11 is positioned between the inner cavity of the compressor main body 1 and the primary shaft seal 6.
In order to further optimize the technical scheme, the maximum ventilation pressure of the primary shaft seal 6 is 0.3MPa, and the maximum inlet flow is 20Nm 3 /h。
In order to further optimize the technical scheme, the maximum leakage pressure of the primary shaft seal 6 is 0.1MPa, and the maximum leakage flow is 30Nm 3 H; the maximum leakage pressure of the secondary shaft seal 7 is 0.2MPa, and the maximum leakage flow is 30Nm 3 H; the maximum leakage pressure of the three-stage shaft seal 8 is 0.1MPa, and the maximum leakage flow is 30Nm 3 /h。
In order to further optimize the technical scheme, the interstage diaphragms 4 which are contacted with high-purity gas in the compressor main body 1 are connected by bolts 12; the bolt 12 is axially provided with a ventilation hole 13.
In order to further optimize the above technical solution, the number of stages of the compressor body 1 is 1-12 stages.
In order to further optimize the above technical solution, the gas supply system is connected by EP-grade metal pipes, flanges and unions.
In order to further optimize the technical scheme, the surface of the inner runner of the compressor main body 1 is polished by adopting a metal polishing processing technology, and the surface roughness Ra is less than or equal to 1.6.
In order to further optimize the technical scheme, degreasing and derusting treatment is carried out when all structural parts are assembled.
In order to further optimize the technical scheme, the O-shaped ring sliding part is coated with special sealing grease for high-purity clean gas for sleeving.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A centrifugal compression method for electron high-purity gas is characterized in that the electron high-purity process gas enters the interior of a compressor main body (1) through a gas inlet (2) of the compressor main body (1), passes through an interstage partition plate (4) step by step through high-speed rotation of a rotor (3), enters a next-stage impeller channel for step-by-step pressurization, and is discharged through a gas outlet (5); the method is characterized in that: a primary shaft seal (6), a secondary shaft seal (7), a tertiary shaft seal (8) and an isolation shaft seal (9) are symmetrically sleeved at two ends of the rotor (3) outwards in sequence; two primary shaft seals (6) at two ends of the rotor (3) are communicated through a balance pipe (10); when the compressor main body (1) works, ultra-high-purity mixed gas is introduced into the first-stage shaft seal (6), high-purity gas is introduced into the second-stage shaft seal (7), mixed gas is introduced into the third-stage shaft seal (8), and inert gas passes through the isolation shaft seal (9); the ventilation pressure of the primary shaft seal (6) is greater than that of the secondary shaft seal (7) and greater than that of the tertiary shaft seal (8) and greater than that of the isolation shaft seal (9); the interior of the compressor main body (1) is connected with an interstage clapboard (4) contacted with high-purity gas by adopting a bolt (12); the bolt (12) is axially provided with a through ventilation hole (13).
2. A centrifugal compression method for electronic high purity gas according to claim 1 wherein the rotor (3) is fitted with a balance disk (11) at the end of the compressor body (1), the balance disk (11) being located between the inner cavity of the compressor body (1) and the primary shaft seal (6).
3. A centrifugal compression process for electronic high purity gases according to claim 1 wherein the maximum aeration pressure of the primary shaft seal (6) is 0.3MPa and the maximum aeration flow is 20Nm 3 /h。
4. A centrifugal compression method for electronic high purity gas according to claim 3 wherein the maximum leakage pressure of the primary shaft seal (6) is 0.1MPa and the maximum leakage flow is 30Nm 3 H; the maximum leakage pressure of the secondary shaft seal (7) is 0.2MPa, and the maximum leakage flow is 30Nm 3 H; the maximum leakage pressure of the three-stage shaft seal (8) is 0.1MPa, and the maximum leakage flow is 30Nm 3 /h。
5. A centrifugal compression method for electronic high purity gas according to claim 1 wherein the number of stages of the compressor body (1) is 1-12 stages.
6. The centrifugal compression process for electronic high purity gas as claimed in claim 1 wherein the gas supply system is connected by EP grade metal piping, flanges and unions.
7. The centrifugal compression method for electronic high-purity gas according to claim 1, wherein the surface of the inner flow channel of the compressor body (1) is polished by metal polishing process, and the surface roughness Ra is less than or equal to 1.6.
8. A centrifugal compression method for electronic high-purity gas according to any one of claims 1 to 7, wherein each structural part is subjected to degreasing and rust removal treatment during assembly.
9. The centrifugal compression method for electronic high-purity gas according to claim 8, wherein the O-ring sliding part is coated with a special sealing grease for high-purity clean gas for sleeving.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110511157.0A CN113107873B (en) | 2021-05-11 | 2021-05-11 | Centrifugal compression method for electronic high-purity gas |
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| CN202110511157.0A CN113107873B (en) | 2021-05-11 | 2021-05-11 | Centrifugal compression method for electronic high-purity gas |
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| CN113107873B true CN113107873B (en) | 2023-03-07 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01187398A (en) * | 1988-01-22 | 1989-07-26 | Hitachi Ltd | Shaft seal device of turbo-compressor for process |
| JP2008002412A (en) * | 2006-06-26 | 2008-01-10 | Hitachi Plant Technologies Ltd | Multiple stage centrifugal compressor |
| CN203939999U (en) * | 2014-07-10 | 2014-11-12 | 杨广华 | The multistage dry gas sealing device of charge gas compressor |
| CN204878041U (en) * | 2015-08-13 | 2015-12-16 | 隋希之 | A sealing device for hydrogen chloride gas carries turbine |
| CN205669505U (en) * | 2016-03-17 | 2016-11-02 | 北京斯特透平机械有限公司 | A kind of centrifugal compressor of band Series Connection Type Dry Gas |
| CN112555173A (en) * | 2020-12-22 | 2021-03-26 | 沈阳斯特机械制造有限公司 | Propylene compressor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6802689B2 (en) * | 2000-03-09 | 2004-10-12 | Hitachi, Ltd. | Turbo type fluid machine and dry gas seal for use therefor |
-
2021
- 2021-05-11 CN CN202110511157.0A patent/CN113107873B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01187398A (en) * | 1988-01-22 | 1989-07-26 | Hitachi Ltd | Shaft seal device of turbo-compressor for process |
| JP2008002412A (en) * | 2006-06-26 | 2008-01-10 | Hitachi Plant Technologies Ltd | Multiple stage centrifugal compressor |
| CN203939999U (en) * | 2014-07-10 | 2014-11-12 | 杨广华 | The multistage dry gas sealing device of charge gas compressor |
| CN204878041U (en) * | 2015-08-13 | 2015-12-16 | 隋希之 | A sealing device for hydrogen chloride gas carries turbine |
| CN205669505U (en) * | 2016-03-17 | 2016-11-02 | 北京斯特透平机械有限公司 | A kind of centrifugal compressor of band Series Connection Type Dry Gas |
| CN112555173A (en) * | 2020-12-22 | 2021-03-26 | 沈阳斯特机械制造有限公司 | Propylene compressor |
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Address after: 010400 Yidong Avenue North, industrial park, Shagedu Town, Zhungeer banner, Ordos City, Inner Mongolia Autonomous Region Applicant after: Inner Mongolia Xingyang Technology Co.,Ltd. Address before: 010400 Yidong Avenue North, industrial park, Shagedu Town, Zhungeer banner, Ordos City, Inner Mongolia Autonomous Region Applicant before: INNER MONGOLIA XINGYANG TECHNOLOGY Co.,Ltd. |
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Denomination of invention: A centrifugal compression method for high-purity electronic gases Granted publication date: 20230307 Pledgee: Zhungeer Coal Field Rural Credit Cooperative Association Pledgor: Inner Mongolia Xingyang Technology Co.,Ltd. Registration number: Y2024150000097 |