CN110043467A - Two-stage series connection compressor cycle reflux control system - Google Patents
Two-stage series connection compressor cycle reflux control system Download PDFInfo
- Publication number
- CN110043467A CN110043467A CN201910472241.9A CN201910472241A CN110043467A CN 110043467 A CN110043467 A CN 110043467A CN 201910472241 A CN201910472241 A CN 201910472241A CN 110043467 A CN110043467 A CN 110043467A
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- compressor
- inlet pressure
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- stage
- pressure
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- 238000010992 reflux Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000013028 medium composition Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
A kind of two-stage series connection compressor cycle reflux control system, including two-stage compressor, return line, two pressure transmitters, three-way control valve and the controller being sequentially connected in series, wherein: two pressure transmitters are respectively arranged at the entrance of two compressors, to detect the inlet pressure of two compressors respectively；Three-way control valve is arranged on return line, and the outlet of split-compressor is connected to the entrance of three-way control valve, and two outlets of three-way control valve are connected to the entrance of two compressors respectively；The testing result that controller is used to receive the valve state signal of three-way control valve feedback and two pressure transmitters are sent, control the aperture of three-way control valve, to adjust the process gas flow for flowing back into stage compressor and split-compressor, the inlet pressure of the inlet pressure and split-compressor that make stage compressor maintains to stablize.The invention enables the operation of compressor set is more safe and reliable.
Description
Technical field
The present invention relates to a kind of circulating reflux technologies of two-stage series connection compressor.
Background technique
It is helical-lobe compressor high reliablity, good dynamic balance, adaptable, if compressed media composition and inlet condition are stablized,
Basic compression process is just stable, and the stabilization and long-term effect of engineer application can be guaranteed.Therefore, existing helical-lobe compressor is all
Equipped with circulating reflux pipeline, so that the rate of discharge of compressor partly flows back into entrance, thus the entrance pressure of constant compression machine
Power (i.e. admission pressure).However, the inlet pressure of split-compressor is often ignored in the compressor set of double stage tandem, warp
Often there is the even too low situation of pressure transient, to bring hidden danger to production safety.
Summary of the invention
Technical problem to be solved by the present invention lies in provide one kind to guarantee stage compressor and two-stage compression simultaneously
The stable two-stage series connection compressor cycle reflux control system of machine inlet pressure.
The technical solution used in the present invention is:
A kind of two-stage series connection compressor cycle flows back control system, including the two-stage compressor and return line being sequentially connected in series,
Two-stage series connection compressor cycle reflux control system includes two pressure transmitters, three-way control valve and controller, in which: two
Pressure transmitter is respectively arranged at the entrance of two compressors, to detect the inlet pressure of two compressors respectively；Threeway tune
Valve is saved to be arranged on return line, the outlet of split-compressor is connected to the entrance of three-way control valve, and two of three-way control valve
Outlet is connected to the entrance of two compressors respectively；Controller be used for receive three-way control valve feedback valve state signal and
The testing result that two pressure transmitters are sent, controls the aperture of three-way control valve, flows back into stage compressor and two to adjust
The process gas flow of grade compressor, the inlet pressure of the inlet pressure and split-compressor that make stage compressor maintain to stablize.
Optionally, in the two-stage series connection compressor cycle reflux control system, controller is used for preferentially according to one
The inlet pressure given value and inlet pressure measured value of grade compressor control the aperture of three-way control valve, so that level-one pressure
The inlet pressure of contracting machine reaches the inlet pressure given value of stage compressor, only in the inlet pressure measured value of stage compressor
It is lower than preset second more than or equal to the inlet pressure measured value of preset first pressure threshold value and split-compressor
When pressure threshold, according to the inlet pressure given value of split-compressor and inlet pressure measured value to the aperture of three-way control valve into
Row control, so that the inlet pressure of split-compressor reaches the inlet pressure given value of split-compressor.
Optionally, in the two-stage series connection compressor cycle reflux control system, controller is used for preferentially according to one
The inlet pressure given value of grade compressor and the deviation of inlet pressure measured value carry out PID control to the aperture of three-way control valve,
So that the inlet pressure of stage compressor reaches the inlet pressure given value of stage compressor, only in the entrance of stage compressor
Pressure measuring value is more than or equal to preset first pressure threshold value and the inlet pressure measured value of split-compressor is lower than in advance
When the second pressure threshold value of setting, according to the deviation of the inlet pressure given value of split-compressor and inlet pressure measured value to three
The aperture of logical regulating valve carries out PID control so that the inlet pressure of split-compressor reach the inlet pressure of split-compressor to
Definite value.
Since present invention employs above technical solution, the technical effect generated is apparent that
1, compared with prior art, the two-stage series connection compressor cycle reflux a set of three-way control valve of control system of the present embodiment
It will flow back all the way and be divided into two-way reflux, and so that two-way regurgitant volume is well controlled, to balance two-stage pressure respectively
The inlet pressure of contracting machine, makes the inlet pressure of two-stage compressor be able to maintain stabilization, not only makes the operation of compressor set more
Securely and reliably, the operation risk of compressor is reduced, and simplifies structure, manufacturing cost is reduced, shortens the manufacturing cycle；
2, the compressor of two-stage series connection is considered as entirety in the prior art, and present invention employs override control, in usual situation
The aperture of three-way control valve is adjusted in the lower inlet pressure according to stage compressor, only in the entrance pressure of stage compressor
Power measured value is lower than more than or equal to the inlet pressure measured value of preset first pressure threshold value and split-compressor to be set in advance
When fixed second pressure threshold value, be just switched to according to the inlet pressure given value of split-compressor to the aperture of three-way control valve into
Row adjust mode, when the inlet pressure measured value of split-compressor be more than or equal to preset second pressure threshold value when after,
Then it is restored to the mode that the aperture of three-way control valve is adjusted according to the inlet pressure of stage compressor.
Detailed description of the invention
Fig. 1 shows the structural representation of two-stage series connection compressor cycle reflux control system according to an embodiment of the invention
Figure.
Fig. 2 shows the controllers of an embodiment of the reflux control system of two-stage series connection compressor cycle according to the present invention
Control schematic diagram.
Fig. 3 shows the controller of an embodiment of the reflux control system of two-stage series connection compressor cycle according to the present invention
Logic control block diagram.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Please refer to Fig. 1 and Fig. 2, a kind of two-stage series connection compressor cycle reflux control system according to an embodiment of the invention
System, including stage compressor 11 and split-compressor 12, level-one cooler 21 and secondary coolers 22, return line 3, first are pressed
Power transmitter 41 and second pressure transmitter 42, three-way control valve 5 and controller 6.
In the present embodiment, stage compressor 11 and split-compressor 12 are helical-lobe compressor, in other embodiments
In, stage compressor 11 and split-compressor 12 are also possible to the other types of compressor such as piston compressor, the present invention couple
This is with no restrictions.
First pressure transmitter 41 and second pressure transmitter 42 are respectively arranged at stage compressor 11 and split-compressor
12 entrance, to detect the inlet pressure of two compressors respectively.Three-way control valve 5 is arranged on return line 3, second level pressure
The outlet of contracting machine 12 is connected to the entrance of three-way control valve 5, and two of three-way control valve 5 outlets enter with two compressors respectively
Mouth connection.
In the present embodiment, the normally opened outlet of three-way control valve 5 is in the entrance of stage compressor 11, three-way control valve
5 normally closed outlet is in the entrance of split-compressor 12.By change three-way control valve 5 stem position, it is adjustable from
The shunt volume of two outlets of three-way control valve 5 process gas be discharged.Level-one cooler 21 is connected on stage compressor 11
Between outlet and the entrance of split-compressor 12, secondary coolers 22 are connected on outlet and the three-way control valve of split-compressor 21
Between 5 entrance.After 11 compression process gas of stage compressor, process gas enters the cooling of level-one cooler 21, and process gas passes through one
After grade cooler 21 is cooling, into split-compressor 12, after 12 compression process gas of split-compressor, it is cooling that process gas enters second level
Device 22 is cooling.
Controller 6 is used to receive the valve state signal and first pressure transmitter 41 and the of the feedback of three-way control valve 5
The testing result that two pressure transmitters 42 are sent controls the aperture of three-way control valve 5, to adjust from the outlet of split-compressor 12
The process gas flow for flowing back into stage compressor 11 and split-compressor 12 makes the inlet pressure and second level pressure of stage compressor 11
The inlet pressure of contracting machine 12 maintains to stablize.
In the present embodiment, controller 6 is used for preferentially according to the inlet pressure given value and inlet pressure of stage compressor 11
Measured value controls the aperture of three-way control valve 5, so that the inlet pressure of stage compressor 11 reaches stage compressor 11
Inlet pressure given value, only the inlet pressure measured value of stage compressor be more than or equal to preset first pressure threshold
When the inlet pressure measured value of value and split-compressor 12 is lower than preset second pressure threshold value, according to split-compressor 12
Inlet pressure given value and inlet pressure measured value the aperture of three-way control valve is controlled so that split-compressor 12
Inlet pressure reaches the inlet pressure given value of split-compressor 12.Second pressure threshold value is greater than first pressure threshold value.
Further, controller 6 according to the inlet pressure given value of stage compressor 11 and inlet pressure for preferentially surveying
The deviation of magnitude carries out PID control to the aperture of three-way control valve 5, so that the inlet pressure of stage compressor 11 reaches level-one pressure
The inlet pressure given value of contracting machine 11 is only more than or equal to preset the in the inlet pressure measured value of stage compressor 11
When the inlet pressure measured value of one pressure threshold and split-compressor 12 is lower than preset second pressure threshold value, according to second level
The inlet pressure given value of compressor 12 and the deviation of inlet pressure measured value carry out PID control to the aperture of three-way control valve 5,
So that the inlet pressure of split-compressor 12 reaches the inlet pressure given value of split-compressor 12.
In the present embodiment, controller 6 is by the way of override control.In general, controller 6 is according to level-one pressure
The inlet pressure given value of contracting machine 11 and the deviation of inlet pressure measured value carry out PID control to the aperture of three-way control valve 5, only
Solely only it is more than or equal to preset first pressure threshold value and split-compressor 12 in the inlet pressure of stage compressor 11
When inlet pressure measured value is lower than preset second pressure threshold value, it is just switched to the inlet pressure according to split-compressor 12
The deviation of given value and inlet pressure measured value carries out the mode of PID control to the aperture of three-way control valve 5, works as split-compressor
After when 12 inlet pressure measured value is restored to more than or equal to preset second pressure threshold value, then controller 6 is switched to again
It is carried out according to aperture of the deviation of the inlet pressure given value of stage compressor 11 and inlet pressure measured value to three-way control valve 5
The mode of PID control.It is equal in the inlet pressure measured value of stage compressor 11 and the inlet pressure measured value of split-compressor 12
When lower than respective preset pressure threshold, controller 6 be also according to the inlet pressure given value of stage compressor 11 with enter
The deviation of mouth pressure measuring value carries out PID control to the aperture of three-way control valve 5, reaches the inlet pressure of stage compressor 11
The inlet pressure given value of stage compressor 11.Later, if if the inlet pressure of split-compressor 12 still is below given value,
It is just adjusted.
Why such control mode is used, is because the compressor of two-stage series connection should be regarded as an entirety, level-one pressure
The inlet pressure of the inlet pressure of contracting machine 11 as a whole is particularly critical, and when the inlet pressure of stage compressor 11 is low,
If regurgitant volume increases, pressure at expulsion can also be increase accordingly, so the inlet pressure of split-compressor 12 can also increase therewith,
It is but to have certain delay.So the inlet pressure control model of stage compressor 11 is just set as conventional control mould
Formula, and the inlet pressure control model of split-compressor 12 is set as to replace control model, and in the entrance of two compressors
When pressure measuring value is below respective preset pressure threshold, the preferential inlet pressure for adjusting stage compressor only exists
When stage compressor inlet pressure is normally and the inlet pressure of split-compressor is lower than preset second pressure threshold value, just take
The control model of generation routine, it is some more with the reflux for flowing into 12 entrance of split-compressor, make entering for split-compressor 12
Mouthful pressure recovery is arrived more than or equal to preset second pressure threshold value, and is restored in the inlet pressure of split-compressor 12
After preset second pressure threshold value, it is still switched to ordinary control mode.In only stage compressor 11
When inlet pressure is less than preset first pressure threshold value, by controlling three-way control valve 5, enter inflow stage compressor 11
The reflux of mouth is some more.
In the present embodiment, controller 6 is PLC controller.Fig. 3 shows two-stage series connection compressor cycle according to the present invention
The logic control block diagram of the controller of one embodiment of the control system that flows back.As shown in figure 3, selector default is according to one stage of compression
The inlet pressure given value of machine 11 and the deviation of inlet pressure measured value carry out PID control to the aperture of three-way control valve 5, when one
The inlet pressure of grade compressor 11 is normally and the inlet pressure of split-compressor 12 is L(, that is, inlet pressure measured value lower than preparatory
The second pressure threshold value of setting) when, selector receives low level, thus switches to the inlet pressure according to split-compressor 12
The deviation of given value and inlet pressure measured value carries out the mode of PID control to the aperture of three-way control valve 5.
Above description is the further explanation done in conjunction with specific embodiment and attached drawing to the present invention.But it is of the invention
Obviously can implement in a variety of other methods different from this description, those skilled in the art can be without prejudice in the present invention
It promoted, deduced according to actual use situation in the case where appearance, therefore, the content of above-mentioned specific embodiment should not limit this hair
Specify fixed protection scope.
Claims (7)
- The control system 1. a kind of two-stage series connection compressor cycle flows back, including the two-stage compressor and return pipe being sequentially connected in series Road, which is characterized in that the two-stage series connection compressor cycle reflux control system includes two pressure transmitters, three-way control valves And controller, in which:Two pressure transmitters are respectively arranged at the entrance of two compressors, to detect the entrance of two compressors respectively Pressure；The three-way control valve is arranged on the return line, and the outlet of split-compressor and the entrance of three-way control valve connect Logical, two outlets of three-way control valve are connected to the entrance of two compressors respectively；The controller is used to receive the valve state signal and two pressure transmitters of the three-way control valve feedback The testing result of transmission controls the aperture of three-way control valve, to adjust the technique for flowing back into stage compressor and split-compressor Throughput, the inlet pressure of the inlet pressure and split-compressor that make stage compressor maintain to stablize.
- The control system 2. two-stage series connection compressor cycle according to claim 1 flows back, which is characterized in that the two-stage string Joining compressor cycle reflux control system includes level-one cooler and secondary coolers, and the level-one cooler is connected on described one Between the outlet and the entrance of the split-compressor of grade compressor, the secondary coolers are connected on the split-compressor Between outlet and the entrance of the three-way control valve.
- The control system 3. two-stage series connection compressor cycle according to claim 1 or 2 flows back, which is characterized in that described three The normally opened outlet of logical regulating valve is in the entrance of the stage compressor, and the normally closed outlet of the three-way control valve is in institute State the entrance of split-compressor.
- The control system 4. two-stage series connection compressor cycle according to claim 1 or 2 flows back, which is characterized in that the control Device processed is used for preferentially according to the inlet pressure given value of stage compressor and inlet pressure measured value to the three-way control valve Aperture is controlled, so that the inlet pressure of stage compressor reaches the inlet pressure given value of stage compressor, only one The inlet pressure measured value of grade compressor is more than or equal to the inlet pressure of preset first pressure threshold value and split-compressor When measured value is lower than preset second pressure threshold value, surveyed according to the inlet pressure given value and inlet pressure of split-compressor Magnitude controls the aperture of the three-way control valve, so that the inlet pressure of split-compressor reaches entering for split-compressor Mouth pressure given value.
- The control system 5. two-stage series connection compressor cycle according to claim 4 flows back, which is characterized in that the controller For preferentially according to the deviation of the inlet pressure given value of stage compressor and inlet pressure measured value to the three-way control valve Aperture carry out PID control so that the inlet pressure of stage compressor reaches the inlet pressure given value of stage compressor, only It is more than or equal to the entrance of preset first pressure threshold value and split-compressor in the inlet pressure measured value of stage compressor When pressure measuring value is lower than preset second pressure threshold value, according to the inlet pressure given value of split-compressor and entrance pressure The deviation of power measured value carries out PID control to the aperture of the three-way control valve, so that the inlet pressure of split-compressor reaches The inlet pressure given value of split-compressor.
- The control system 6. two-stage series connection compressor cycle according to claim 1 or 2 flows back, which is characterized in that described one Grade compressor and the split-compressor are helical-lobe compressor.
- The control system 7. two-stage series connection compressor cycle according to claim 1 or 2 flows back, which is characterized in that the control Device processed is PLC controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910472241.9A CN110043467A (en) | 2019-05-31 | 2019-05-31 | Two-stage series connection compressor cycle reflux control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910472241.9A CN110043467A (en) | 2019-05-31 | 2019-05-31 | Two-stage series connection compressor cycle reflux control system |
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| CN110043467A true CN110043467A (en) | 2019-07-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110538479A (en) * | 2019-10-12 | 2019-12-06 | 上海齐耀膨胀机有限公司 | Compression type heat pump rectification method for acetic acid concentration and system thereof |
| CN114001803A (en) * | 2021-09-09 | 2022-02-01 | 浙江浙能天然气运行有限公司 | Bypass type natural gas flow automatic verification control system and control method thereof |
| CN115467830A (en) * | 2022-09-19 | 2022-12-13 | 上海齐耀螺杆机械有限公司 | Gas quantity adjusting device and method for two-stage screw compressor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05170412A (en) * | 1991-12-19 | 1993-07-09 | Nippon Sanso Kk | Method and device for recovering helium |
| CN103982408A (en) * | 2014-04-09 | 2014-08-13 | 上海好米工业技术有限公司 | Multistage compressor section-by-section pressure control device based on PLC (programmable logic controller) |
| CN104747453A (en) * | 2015-02-07 | 2015-07-01 | 宁波鲍斯能源装备股份有限公司 | Two-stage screw compressor discharge pressure stabilizing device and two-stage screw compressor discharge pressure stabilizing method |
| CN210135084U (en) * | 2019-05-31 | 2020-03-10 | 上海齐耀螺杆机械有限公司 | Two-stage series compressor circulation reflux control system |
-
2019
- 2019-05-31 CN CN201910472241.9A patent/CN110043467A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05170412A (en) * | 1991-12-19 | 1993-07-09 | Nippon Sanso Kk | Method and device for recovering helium |
| CN103982408A (en) * | 2014-04-09 | 2014-08-13 | 上海好米工业技术有限公司 | Multistage compressor section-by-section pressure control device based on PLC (programmable logic controller) |
| CN104747453A (en) * | 2015-02-07 | 2015-07-01 | 宁波鲍斯能源装备股份有限公司 | Two-stage screw compressor discharge pressure stabilizing device and two-stage screw compressor discharge pressure stabilizing method |
| CN210135084U (en) * | 2019-05-31 | 2020-03-10 | 上海齐耀螺杆机械有限公司 | Two-stage series compressor circulation reflux control system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110538479A (en) * | 2019-10-12 | 2019-12-06 | 上海齐耀膨胀机有限公司 | Compression type heat pump rectification method for acetic acid concentration and system thereof |
| CN114001803A (en) * | 2021-09-09 | 2022-02-01 | 浙江浙能天然气运行有限公司 | Bypass type natural gas flow automatic verification control system and control method thereof |
| CN114001803B (en) * | 2021-09-09 | 2024-02-27 | 国家管网集团浙江省天然气管网有限公司 | Bypass type natural gas flow automatic verification control system and control method thereof |
| CN115467830A (en) * | 2022-09-19 | 2022-12-13 | 上海齐耀螺杆机械有限公司 | Gas quantity adjusting device and method for two-stage screw compressor |
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