CN104747453B - Two-stage screw compressor discharge pressure stabilizing device and two-stage screw compressor discharge pressure stabilizing method - Google Patents
Two-stage screw compressor discharge pressure stabilizing device and two-stage screw compressor discharge pressure stabilizing method Download PDFInfo
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- CN104747453B CN104747453B CN201510069449.8A CN201510069449A CN104747453B CN 104747453 B CN104747453 B CN 104747453B CN 201510069449 A CN201510069449 A CN 201510069449A CN 104747453 B CN104747453 B CN 104747453B
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Abstract
The invention provides a two-stage screw compressor discharge pressure stabilizing device which comprises a front buffer tank, wherein the front buffer tank is connected with a primary screw compressor; the rear part of the primary screw compressor is connected with a primary buffer tank; the primary buffer tank is connected with a secondary screw compressor; the rear part of the secondary screw compressor is connected with the secondary buffer tank. The two-stage screw compressor discharge pressure stabilizing device is characterized in that the primary buffer tank is connected with the front buffer tank by virtue of a primary exhaust gas backflow pipeline; the primary exhaust gas return pipeline is provided with a primary backflow regulating valve; the primary buffer tank is further provided with a primary exhaust gas pressure relief pipeline; the primary exhaust gas pressure relief pipeline is connected with the front buffer tank; the secondary buffer tank is connected with the front buffer tank by virtue of a secondary exhaust gas backflow pipeline; the secondary exhaust gas backflow pipeline is provided with a secondary backflow regulating valve; the secondary buffer tank is further provided with a secondary exhaust gas pressure relief pipeline; the secondary exhaust gas pressure relief pipeline is connected with the front buffer tank. The two-stage screw compressor discharge pressure stabilizing device has the advantages that the exhaust gas backflow valves and the exhaust gas pressure relief valves are sequentially adjusted by virtue of a PLC, so that the exhaust gas pressure stability is ensured, and the system automation degree is improved.
Description
Technical field
The present invention relates to a kind of two-stage helical-lobe compressor automatic control technology field；Specifically related to a kind of two-stage screw compression
The stabilising arrangement and its antihunt means of machine pressure at expulsion.
Background technology
Existing large-scale combustible gas power plant quality of filling gas is required it is higher, stability especially to supply gas pressure and
The degree of purity of gas has strict requirements；If the over proof number range of supply gas pressure, can cause electricity generation system report
Alert, the scope for exceeding is larger, results even in electricity generation system shutdown.
The pressure charging system in combustible gas power plant generally adopt two-stage helical-lobe compressor, into helical-lobe compressor unstripped gas not
There is the phenomenon of pressure oscillation with can avoiding, when the pressure oscillation of unstripped gas, the pressure at expulsion of one-level helical-lobe compressor also with
Fluctuation, at the same time the pressure at expulsion of two grades of helical-lobe compressors also can fluctuate.
If in the case of raw gas pressure fluctuation range is less, PLC according to pressure transmitter transmission come exhaust pressure
Power actual value is compared with setting value, and stablizing for supply gas pressure can be just effectively ensured so as to adjust electric machine frequency；However, working as
When raw gas pressure fluctuation range is larger, pressure at expulsion also necessarily leads to larger fluctuation, now generally requires artificially to adjust electricity
The running frequency of machine, to guarantee stablizing for pressure at expulsion.This manual adjustment mode can usually occur hysteresis, so as to cause
The warning of electricity generation system is even shut down.Therefore, method of manual adjustment affects equipment reliability of operation, and reduces power plant life
Produce efficiency.
The content of the invention
The technical problem to be solved is the situation for prior art, there is provided one kind can improve the stability of a system
And the devices and methods therefor of the stable pressure at expulsion of two-stage helical-lobe compressor for automatically controlling.
The present invention solve the technical scheme that adopted of above-mentioned technical problem for：A kind of stable exhaust pressure of two-stage helical-lobe compressor
The device of power, including front buffer tank, the front buffer tank is by one-level air inlet pipeline and the air inlet of one-level helical-lobe compressor
It is connected；The gas outlet of the one-level helical-lobe compressor is connected by one-level gas exhaust piping with first-level buffer tank；The first-level buffer tank
Top is connected by secondary inlet pipeline with the air inlet of two grades of helical-lobe compressors, and the gas outlet of two grades of helical-lobe compressors passes through
Secondary exhaust pipeline is connected with level 2 buffering tank；One-level pressure at expulsion transmitter is installed on the one-level gas exhaust piping, it is described
Secondary exhaust pressure transmitter is installed, the one-level pressure at expulsion transmitter and secondary exhaust pressure become on secondary exhaust pipeline
Device is sent to be connected with PLC；It is characterized in that：
The first-level buffer tank top is connected by one-level exhaust gas recirculation pipeline with the front buffer tank；In the one-level
One-level return valve is installed on exhaust gas recirculation pipeline；The one-level return valve is connected with the PLC；The first-level buffer
Tank top is additionally provided with one-level exhaust pressure relief pipeline, and the one-level exhaust pressure relief pipeline connects the front buffer tank；Described one
One-level exhaust pressure relief valve is installed on level exhaust pressure relief pipeline, the one-level exhaust pressure relief valve is connected with the PLC；
The level 2 buffering tank top is connected by secondary exhaust return line with the front buffer tank；At described two grades
Two grades of return valves are installed on exhaust gas recirculation pipeline；Two grades of return valves are connected with the PLC；The level 2 buffering
Tank top is additionally provided with secondary exhaust pressure relief pipe, and the secondary exhaust pressure relief pipe connects the front buffer tank；Described two
Secondary exhaust relief valve is installed on level exhaust pressure relief pipeline, the secondary exhaust relief valve is connected with the PLC.
The one-level helical-lobe compressor is driven by one-level variable-frequency motor, and the one-level variable-frequency motor is connected with the PLC；It is described
Two grades of helical-lobe compressors are driven by two grades of variable-frequency motors, and two grades of variable-frequency motors are connected with the PLC.
The present invention one stage of compression be provided with connection first-level buffer tank and front buffer tank one-level exhaust gas recirculation pipeline and
One-level exhaust pressure relief pipeline, one-level exhaust gas recirculation pipeline is provided with one-level exhaust gas recirculation regulating valve, on one-level exhaust pressure relief pipeline
One-level exhaust pressure relief valve is installed.The data that PLC is gathered according to pressure sensor, are analyzed and compare, so as to be vented to one-level
Return valve or one-level exhaust pressure relief valve are adjusted, and reach the stable purpose of pressure at expulsion.Two grades of helical-lobe compressors are adopted
Same adjusting means.The automaticity of system is greatly improved, operational reliability is increased.
A kind of two-stage helical-lobe compressor pressure at expulsion antihunt means, comprise the following steps that：
The first step, selection control model：Control model is adjusted to " manual mode "；
Second step, parameter setting：The electric machine frequency of setting one-level variable-frequency motor and two grades of variable-frequency motors, one-level is vented back
The aperture of stream regulating valve and secondary exhaust return valve is set as 0%；
3rd step, start；
4th step, manual regulation parameter；The electric machine frequency of one-level variable-frequency motor and two grades of variable-frequency motors is adjusted manually, makes one
Level pressure at expulsion and secondary exhaust pressure reach setting value；
5th step, switching control pattern：One-level pressure at expulsion and secondary exhaust pressure actual value undulate quantity are less than setting
± the 1% of value, and stable operation 2 minutes；It is " automatic mode " by control mode switch；
6th step, PLC are automatically controlled：
PLC is compared the one-level pressure at expulsion actual value that one-level pressure at expulsion transmitter is gathered with setting value；
When one-level pressure at expulsion actual value is less than one-level pressure at expulsion setting value, one-level variable-frequency motor is improved by PLC
Frequency, and reduce the aperture of one-level return valve, make one-level pressure at expulsion actual value reach setting value；If still low more than 2 seconds
In setting value, one-level exhaust pressure relief valve is closed；
When one-level pressure at expulsion actual value is higher than one-level pressure at expulsion setting value, one-level variable-frequency motor is reduced by PLC
Frequency, while increasing the aperture of one-level return valve, makes one-level pressure at expulsion actual value reach setting value；If more than 2 seconds still
Higher than setting value, PLC control one-level exhaust pressure relief valves are opened, and closing when one-level pressure at expulsion actual value is less than setting value should
One-level exhaust pressure relief valve；
Meanwhile, PLC is compared the secondary exhaust pressure actual value that secondary exhaust pressure transmitter is gathered with setting value；
When secondary exhaust pressure actual value is less than secondary exhaust pressure set points, by PLC two grades of variable-frequency motors of raising
Frequency, and reduce the aperture of two grades of return valves, make secondary exhaust pressure actual value reach setting value；If still low more than 2 seconds
In setting value, one-level exhaust pressure relief valve is closed；；
When secondary exhaust pressure actual value is higher than secondary exhaust pressure set points, by PLC two grades of variable-frequency motors of reduction
Frequency, while increasing the aperture of two grades of return valves, makes secondary exhaust pressure actual value reach setting value；If more than 2 seconds still
Higher than setting value, PLC control one-level exhaust pressure relief valves are opened, and closing when one-level pressure at expulsion actual value is less than setting value should
One-level exhaust pressure relief valve.
The present invention adopts PLC autocontrol methods, greatly improves the automation function of equipment, reduces the dependence to people
Degree, and equipment reliability of operation is improved, so as to improve production efficiency.
Description of the drawings
Fig. 1 is the structure drawing of device of the present invention；
Fig. 2 is the control flow chart of the present invention；
Specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
Fig. 1 illustrates one embodiment of the present invention, wherein two-stage helical-lobe compressor pressure at expulsion stabilising arrangement it include it is front
Surge tank 2 is put, the front buffer tank is connected by one-level air inlet pipeline 3 with the air inlet of one-level helical-lobe compressor 4.One-level screw rod
The gas outlet of compressor 4 is connected by one-level gas exhaust piping 6 with first-level buffer tank 9.Unstripped gas 1 passes through prefilter surge tank 2
Into one-level helical-lobe compressor 4, discharge Jing after one-level helical-lobe compressor 4 compresses, the unstripped gas of discharge passes through one-level gas exhaust piping 6
Into first-level buffer tank 9.
One-level helical-lobe compressor 4 is driven by one-level variable-frequency motor 5, and one-level variable-frequency motor 5 is by PLC26 controls.In one-level row
One-level pressure at expulsion transmitter 8 is installed, the one-level pressure at expulsion transmitter 8 is connected with PLC on air pipe 6.First-level buffer tank 9
Top is connected by one-level exhaust gas recirculation pipeline 10 with front buffer tank 2；One-level is installed on one-level exhaust gas recirculation pipeline 10
Return valve 11；The one-level return valve 11 is controlled to adjust by PLC.The top of first-level buffer tank 9 is additionally provided with one-level exhaust
Pressure relief pipe 12, the connection front buffer of one-level exhaust pressure relief pipeline 12 tank 2；One-level is installed on one-level exhaust pressure relief pipeline 12
Exhaust pressure relief valve 13, the one-level exhaust pressure relief valve 13 is controlled to adjust by PLC.
When one-level pressure at expulsion fluctuates, first adjusted by one-level variable-frequency motor and one-level return valve；In exhaust
Pressure exceedes setting value, if the adjustment of one-level variable-frequency motor and one-level return valve cannot stablize one-level pressure at expulsion, beats
Driving one-level exhaust pressure relief valve carries out pressure release, is finally reached the purpose of stable one-level pressure at expulsion.
Its one-level pressure at expulsion control process is such：The one-level exhaust that PLC gathers one-level pressure at expulsion transmitter 8
Pressure actual value is compared with setting value；
(1) when one-level pressure at expulsion actual value is less than one-level pressure at expulsion setting value, one-level variable-frequency motor is improved by PLC
5 frequency, and reduce the aperture of one-level return valve 11, make one-level pressure at expulsion actual value reach setting value.If more than 2 seconds
Setting value is still below, one-level exhaust pressure relief valve 13 is closed.
(2) when one-level pressure at expulsion actual value is higher than one-level pressure at expulsion setting value, one-level variable-frequency motor is reduced by PLC
5 frequency, while increasing the aperture of one-level return valve 11, makes one-level pressure at expulsion actual value reach setting value；If more than 2
Second remains above setting value, and PLC control one-level exhaust pressure reliefs valve 13 is opened, when one-level pressure at expulsion actual value is less than setting value
Close the one-level exhaust pressure relief valve 13.
The top of first-level buffer tank 9 is connected by secondary inlet pipeline 14 with the air inlet of two grades of helical-lobe compressors 15, should
Two grades of helical-lobe compressors 15 are driven by two grades of variable-frequency motors 16, and two grades of variable-frequency motors 16 are by PLC26 controls.Two grades of screw compressions
The gas outlet of machine 15 is connected by secondary exhaust pipeline 17 with level 2 buffering tank 20.One stage of compression raw material in first-level buffer tank 9
Gas enters two grades of helical-lobe compressors 15 by secondary inlet pipe 14, and Jing after two grades of helical-lobe compressors 15 compress secondary exhaust is passed through
Road 17 enters level 2 buffering tank 20.
Secondary exhaust pressure transmitter 19 is installed on secondary exhaust pipeline 17, the secondary exhaust pressure transmitter 19 with
PLC is connected.The top of level 2 buffering tank 20 is connected by secondary exhaust return line 21 with front buffer tank 2；Return in secondary exhaust
Two grades of return valves 22 are installed on flow tube road 21；Two grades of regulating valves 22 are controlled to adjust by PLC26.Level 2 buffering tank 20 is pushed up
Portion is additionally provided with secondary exhaust pressure relief pipe 23, the connection front buffer of secondary exhaust pressure relief pipe 23 tank 2；Let out in secondary exhaust
Secondary exhaust relief valve 24 is installed, the secondary exhaust relief valve 24 is controlled to adjust by PLC26 on pressure pipe road 23.
When secondary exhaust pressure oscillation, first adjusted by two grades of variable-frequency motors and one-level return valve；At two grades
Pressure at expulsion exceedes setting value, if the adjustment of two grades of variable-frequency motors and two grades of return valves cannot stablize secondary exhaust pressure,
Then opening secondary exhaust relief valve carries out pressure release, is finally reached the purpose of stable secondary exhaust pressure.
Secondary exhaust pressure control procedure is such：The secondary exhaust that PLC gathers secondary exhaust pressure transmitter 19
Pressure actual value is compared with setting value；
(1) when secondary exhaust pressure actual value is less than secondary exhaust pressure set points, two grades of variable-frequency motors are improved by PLC
16 frequency, and reduce the aperture of two grades of return valves 22, make secondary exhaust pressure actual value reach setting value.If more than 2
Second is still below setting value, closes secondary exhaust relief valve 24.
(2) when secondary exhaust pressure actual value is higher than secondary exhaust pressure set points, two grades of variable-frequency motors are reduced by PLC
16 frequency, while increasing the aperture of two grades of return valves 22, makes secondary exhaust pressure actual value reach setting value；If exceeding
Setting value is remained above within 2 seconds, PLC control secondary exhausts relief valve 24 is opened, until secondary exhaust pressure actual value is less than setting value
When close the secondary exhaust relief valve 24.
As shown in Fig. 2 a kind of two-stage helical-lobe compressor pressure at expulsion antihunt means, comprise the following steps that：
The first step, selection control model：Control model is adjusted to " manual mode "；
Second step, parameter setting：The electric machine frequency of setting one-level variable-frequency motor and two grades of variable-frequency motors, one-level is vented back
The aperture of stream regulating valve and secondary exhaust return valve is set as 0%；
3rd step, start；
4th step, manual regulation parameter；The electric machine frequency of one-level variable-frequency motor and two grades of variable-frequency motors is adjusted manually, makes one
Level pressure at expulsion and secondary exhaust pressure reach setting value；
5th step, switching control pattern：One-level pressure at expulsion and secondary exhaust pressure actual value undulate quantity are less than setting
± the 1% of value, and stable operation 2 minutes；It is " automatic mode " by control mode switch；
6th step, PLC are automatically controlled：
PLC is compared the one-level pressure at expulsion actual value that one-level pressure at expulsion transmitter 8 is gathered with setting value；
When one-level pressure at expulsion actual value is less than one-level pressure at expulsion setting value, one-level variable-frequency motor 5 is improved by PLC
Frequency, and reduce the aperture of one-level return valve 11, make one-level pressure at expulsion actual value reach setting value；If more than 2 seconds still
Less than setting value, one-level exhaust pressure relief valve 13 is closed；
When one-level pressure at expulsion actual value is higher than one-level pressure at expulsion setting value, one-level variable-frequency motor 5 is reduced by PLC
Frequency, while increasing the aperture of one-level return valve 11, makes one-level pressure at expulsion actual value reach setting value；If more than 2 seconds
Setting value is remained above, PLC control one-level exhaust pressure reliefs valve 13 is opened, closed when one-level pressure at expulsion actual value is less than setting value
Close the one-level exhaust pressure relief valve 13；
Meanwhile, secondary exhaust pressure actual value and the setting value that PLC gathers secondary exhaust pressure transmitter 19 is compared
Compared with；
When secondary exhaust pressure actual value is less than secondary exhaust pressure set points, two grades of variable-frequency motors 16 are improved by PLC
Frequency, and reduce the aperture of two grades of return valves 22, make secondary exhaust pressure actual value reach setting value；If more than 2 seconds
Setting value is still below, secondary exhaust relief valve 24 is closed；
When secondary exhaust pressure actual value is higher than secondary exhaust pressure set points, two grades of variable-frequency motors 16 are reduced by PLC
Frequency, while increase two grades of return valves 22 aperture, make secondary exhaust pressure actual value reach setting value；If more than 2
Second remains above setting value, and PLC control secondary exhausts relief valve 24 is opened, when secondary exhaust pressure actual value is less than setting value
Close the secondary exhaust relief valve 24.
The present invention increased on the basis of existing technology return valve and exhaust pressure relief valve, the return valve and row
Gas relief valve is controlled to adjust by PLC.PLC is calculated according to the actual value of pressure at expulsion with setting value, and then to being vented back
Stream valve and exhaust pressure relief valve are adjusted, it is ensured that the stability of pressure at expulsion, substantially increase the automaticity of system, increase
Operational reliability is added.And two-stage is adjusted to be carried out, interrelated simultaneously.
Claims (3)
1. a kind of two-stage helical-lobe compressor pressure at expulsion stabilising arrangement, including front buffer tank (2), the front buffer tank (2) leads to
Cross one-level air inlet pipeline (3) to be connected with the air inlet of one-level helical-lobe compressor (4)；The gas outlet of the one-level helical-lobe compressor (4)
It is connected with first-level buffer tank (9) by one-level gas exhaust piping (6)；The top of the first-level buffer tank (9) passes through secondary inlet pipeline
(14) it is connected with the air inlet of two grades of helical-lobe compressors (15), the gas outlet of two grades of helical-lobe compressors (15) passes through secondary exhaust
Pipeline (17) is connected with level 2 buffering tank (20)；One-level pressure at expulsion transmitter is installed on the one-level gas exhaust piping (6)
(8), secondary exhaust pressure transmitter (19), the one-level pressure at expulsion transmitter are installed on the secondary exhaust pipeline (17)
(8) it is connected with PLC (26) with secondary exhaust pressure transmitter (19)；It is characterized in that：
First-level buffer tank (9) top is connected by one-level exhaust gas recirculation pipeline (10) with the front buffer tank (2)；Institute
State and one-level return valve (11) is installed in one-level exhaust gas recirculation pipeline (10)；The one-level return valve (11) with it is described
PLC (26) is connected；First-level buffer tank (9) top is additionally provided with one-level exhaust pressure relief pipeline (12), the one-level exhaust pressure relief
Pipeline (12) connects the front buffer tank (2)；One-level exhaust pressure relief valve is installed on the one-level exhaust pressure relief pipeline (12)
(13), one-level exhaust pressure relief valve (13) is connected with the PLC (26)；
Level 2 buffering tank (20) top is connected by secondary exhaust return line (21) with the front buffer tank (2)；
Two grades of return valves (22) are installed on the secondary exhaust return line (21)；Two grades of return valves (22) with it is described
PLC (26) is connected；Level 2 buffering tank (20) top is additionally provided with secondary exhaust pressure relief pipe (23), the secondary exhaust pressure release
Pipeline (23) connects the front buffer tank (2)；Secondary exhaust relief valve is installed on the secondary exhaust pressure relief pipe (23)
(24), the secondary exhaust relief valve (24) is connected with the PLC (26).
2. two-stage helical-lobe compressor pressure at expulsion stabilising arrangement according to claim 1, it is characterised in that：The one-level spiral shell
Bar compressor (4) is driven by one-level variable-frequency motor (5), and the one-level variable-frequency motor (5) is connected with the PLC (26)；Described two grades
Helical-lobe compressor (15) is driven by two grades of variable-frequency motors (16), and two grades of variable-frequency motors (16) are connected with the PLC (26).
3. a kind of two-stage helical-lobe compressor pressure at expulsion antihunt means, comprise the following steps that：
The first step, selection control model：Control model is adjusted to " manual mode "；
Second step, parameter setting：The electric machine frequency of setting one-level variable-frequency motor and two grades of variable-frequency motors, by one-level return valve
It is set as 0% with the aperture of two grades of return valves；
3rd step, start；
4th step, manual regulation parameter；The electric machine frequency of one-level variable-frequency motor and two grades of variable-frequency motors is adjusted manually, arranges one-level
Atmospheric pressure reaches one-level pressure at expulsion setting value, and secondary exhaust pressure reaches secondary exhaust pressure set points；
5th step, switching control pattern：One-level pressure at expulsion and secondary exhaust pressure actual value undulate quantity are less than each exhaust
± the 1% of pressure set points, and stable operation 2 minutes；It is " automatic mode " by control mode switch；
6th step, PLC are automatically controlled：
The one-level pressure at expulsion actual value that PLC gathers one-level pressure at expulsion transmitter (8) is entered with one-level pressure at expulsion setting value
Row compares；
When one-level pressure at expulsion actual value is less than one-level pressure at expulsion setting value, the frequency of one-level variable-frequency motor (5) is improved by PLC
Rate, and reduce the aperture of one-level return valve (11), make one-level pressure at expulsion actual value reach one-level pressure at expulsion setting value；
If being still below one-level pressure at expulsion setting value more than 2 seconds, one-level exhaust pressure relief valve (13) is closed；
When one-level pressure at expulsion actual value is higher than one-level pressure at expulsion setting value, the frequency of one-level variable-frequency motor (5) is reduced by PLC
Rate, while increasing the aperture of one-level return valve (11), makes one-level pressure at expulsion actual value reach the setting of one-level pressure at expulsion
Value；If remaining above one-level pressure at expulsion setting value more than 2 seconds, PLC controls one-level exhaust pressure relief valve (13) is opened, until one-level row
Atmospheric pressure actual value closes one-level exhaust pressure relief valve (13) when being less than one-level pressure at expulsion setting value；
Meanwhile, PLC sets the secondary exhaust pressure actual value that secondary exhaust pressure transmitter (19) is gathered with secondary exhaust pressure
Definite value is compared；
When secondary exhaust pressure actual value is less than secondary exhaust pressure set points, by PLC two grades of variable-frequency motors (16) of raising
Frequency, and reduce the aperture of two grades of return valves (22), make secondary exhaust pressure actual value reach the setting of secondary exhaust pressure
Value；If being still below secondary exhaust pressure set points more than 2 seconds, secondary exhaust relief valve (24) is closed；
When secondary exhaust pressure actual value is higher than secondary exhaust pressure set points, by PLC two grades of variable-frequency motors (16) of reduction
Frequency, while increasing the aperture of two grades of return valves (22), makes secondary exhaust pressure actual value reach secondary exhaust pressure and sets
Definite value；If remaining above secondary exhaust pressure set points more than 2 seconds, PLC controls secondary exhaust relief valve (24) is opened, until two grades
Pressure at expulsion actual value closes the secondary exhaust relief valve (24) when being less than secondary exhaust pressure set points.
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| CN201510069449.8A CN104747453B (en) | 2015-02-07 | 2015-02-07 | Two-stage screw compressor discharge pressure stabilizing device and two-stage screw compressor discharge pressure stabilizing method |
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| CN201510069449.8A CN104747453B (en) | 2015-02-07 | 2015-02-07 | Two-stage screw compressor discharge pressure stabilizing device and two-stage screw compressor discharge pressure stabilizing method |
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| CN107121990B (en) * | 2017-05-23 | 2020-05-08 | 青岛理工大学 | Pressure regulating device for heating system |
| CN107869458B (en) * | 2017-11-13 | 2024-06-28 | 华中科技大学 | Pressure reducing buffer device for closed performance test system of large reciprocating compressor |
| CN110005610B (en) * | 2018-01-04 | 2022-07-26 | 复盛实业(上海)有限公司 | Interstage bleed air compressor |
| CN109812416A (en) * | 2019-03-29 | 2019-05-28 | 重庆奇螺流体设备有限公司 | Efficient two-stage air compressor and its control method |
| CN110043467A (en) * | 2019-05-31 | 2019-07-23 | 上海齐耀螺杆机械有限公司 | Two-stage series connection compressor cycle reflux control system |
| CN115467830B (en) * | 2022-09-19 | 2024-08-06 | 上海齐耀螺杆机械有限公司 | Gas flow regulating device and regulating method for two-stage screw compressor |
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| US3186631A (en) * | 1963-10-03 | 1965-06-01 | Jaeger Machine Co | Rotary compressor |
| KR101176482B1 (en) * | 2006-10-19 | 2012-08-22 | 엘지전자 주식회사 | Multi-air conditioner for heating and cooling operations at the same time |
| CN201925170U (en) * | 2011-01-19 | 2011-08-10 | 宁波鲍斯能源装备股份有限公司 | Air intake device of screw compressor |
| WO2014047377A2 (en) * | 2012-09-21 | 2014-03-27 | Sandvik Surface Mining | Method and apparatus for decompressing a compressor |
| JP6078361B2 (en) * | 2013-01-30 | 2017-02-08 | 株式会社日立産機システム | air compressor |
| CN204493196U (en) * | 2015-02-07 | 2015-07-22 | 宁波鲍斯能源装备股份有限公司 | A kind of two-stage helical-lobe compressor exhaust pressure stabilizer |
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