CN108468643A - It can determine the screw compressor capacity control system and method for the operation of frequency speed-changing - Google Patents
It can determine the screw compressor capacity control system and method for the operation of frequency speed-changing Download PDFInfo
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- CN108468643A CN108468643A CN201810483330.9A CN201810483330A CN108468643A CN 108468643 A CN108468643 A CN 108468643A CN 201810483330 A CN201810483330 A CN 201810483330A CN 108468643 A CN108468643 A CN 108468643A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000009471 action Effects 0.000 claims abstract description 19
- 238000004804 winding Methods 0.000 claims description 113
- 239000007858 starting material Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 230000000977 initiatory effect Effects 0.000 claims description 2
- 238000003032 molecular docking Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000003137 locomotive effect Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 240000002853 Nelumbo nucifera Species 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 2
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000035807 sensation Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
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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
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
-
- 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
- F04C23/02—Pumps characterised by combination with or adaptation to specific driving engines or motors
-
- 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
- F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
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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
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/28—Safety arrangements; Monitoring
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details
- H02P1/022—Security devices, e.g. correct phase sequencing
- H02P1/024—Protection against simultaneous starting by two starting devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
Abstract
The invention discloses a kind of screw compressor capacity control systems and method for determining the operation of frequency speed-changing, include containing the helical-lobe compressor for determining frequency motor, the bypass guiding valve of adjustable capacity is installed on helical-lobe compressor, also set up bypass guiding valve action drives device, motor driver, controller and load-measuring device, bypass guiding valve is connect with bypass guiding valve action drives device signal, and by bypass guiding valve action drives device control, also set up bypass spool position sensor, bypass spool position sensor is connect with helical-lobe compressor for measuring spool position, load-measuring device is for detecting compressor operating load condition, motor driver is connect with invariable frequency compressor；Spool position sensor, bypass guiding valve action drives device, load-measuring device, motor driver and controller signals are bypassed to connect.It realizes higher at full capacity with coefficient of performance when operation at part load, adapts to start frequent scene, inhibit starting current peak value.
Description
Technical field
The invention belongs to refrigeration air-conditioner dynamic Control technical fields, and in particular to a kind of screw compressor capacity control system
And method.
Background technology
Screw type cold air-conditioner set is generally divided into using the air-conditioner set for determining frequency constant speed driving helical-lobe compressor（Referred to as
Determine frequency Screw chiller）, and use the air-conditioner set of variable-frequency and variable-speed driving helical-lobe compressor（Abbreviation frequency conversion screw unit）.Determine frequency spiral shell
The coefficient of performance is high at full capacity for bar unit, but performance is relatively low when off-load to operation at part load；Frequency conversion screw unit sub-load is transported
Performance is high when row, but the coefficient of performance declines at full capacity, but compares and determine frequency Screw chiller price of high cost.
Determine frequency Screw chiller using determine frequency constant speed helical-lobe compressor, it is negative to part by off-load at full capacity in load reduction
When lotus runs, determines frequency helical-lobe compressor and generally carry out capacity regulating by by-pass collars such as guiding valves, due to being directed to bypass-unloading
Gas had been compressed before bypass, there are invalid acting, part load performance coefficient COP is relatively low.
Using the frequency conversion screw unit of variable-frequency and variable-speed helical-lobe compressor, in load reduction by fully loaded off-load to sub-load
When, capacity regulating is realized by frequency converter adjusting screw rod compressor rotary speed, there is no invalid acting, parts caused by bypass
Load performance coefficient is higher, since there are power attenuations for frequency converter（About 3~5%）, when oepration at full load, coefficient of performance phase
There are 3~5% or so declines than determining frequency screw rod air-conditioner set, but frequency converter is of high cost causes frequency conversion screw unit complete machine of high cost.
Thus will determine frequency Screw chiller progress appropriate speed control, especially with determine frequency constant speed Screw chiller it is comparable at
This lower realizes is at full capacity higher screw type cold air-conditioner set with coefficient of performance when operation at part load, will be become
A technical problem urgently to be resolved hurrily of refrigeration technology field at present.
In commercial Application, often needing to a motor can be with double speed（Multi-speed）Operation, double speed（Multi-speed）Refer both to velocity transformation
Gear such as high speed, the differentiation of low speed or middling speed.Common double speed（Multi-speed）Electric motor starting and operation means have contactor driving, become
Frequency device drives, soft strater driving.And contactor driving realizes that motor star triangle start and high low speed switch this scheme and start
There is secondary current impact in the process, of high cost, complicated, high failure rate；And transducer drive realizes electric motor starting and height
It is impacted without secondary current although speed switches in this scheme start-up course, and starting current is small, starts smooth, program cost
It is too high；Soft strater driving realizes that soft starter for motor and high low speed switch this scheme, simple in structure at low cost, starts nothing
It impacts and is used widely.
Traditional soft strater drive scheme is usually to use a soft strater, is reconfigured two（It is multiple）Contactor,
When startup, it is first closed a contactor, restarts soft strater, when stopping first stopping soft strater releasing contactor again.Due to soft
Starter requires the number of starts in unit hour, if the frequent program of the site requirement number of starts be likely to result in it is soft
Starter damage, current requirements are big when soft strater drives high speed, require electric current small when driving low speed, and start-up parameter and startup limit
Stream is all different, and Protection parameters are also different, and therefore, traditional soft strater drive scheme can not reliably protect motor, and control
Start up curve.
Invention content
Technical problem to be solved by the invention is to provide a kind of screw compressor capacities for determining the operation of frequency speed-changing
Control system and method, with determine to realize under the comparable cost of frequency constant speed Screw chiller it is higher at full capacity and operation at part load
When coefficient of performance, and adapt to start frequent scene, have the ability for inhibiting starting current peak value.
The present invention supplies to be directed to the technical issues that need to address, provides the technical solution solved as follows：
A kind of screw compressor capacity control system for determining the operation of frequency speed-changing, includes containing the screw compression for determining frequency motor
Machine is equipped with the bypass guiding valve of adjustable capacity on helical-lobe compressor, also sets up bypass guiding valve action drives device, motor driving
Device, controller and load-measuring device, bypass guiding valve connect with bypass guiding valve action drives device signal and are moved by bypass guiding valve
Make driver control, it is characterised in that：Bypass spool position sensor is also set up, spool position sensor and screw compression are bypassed
Machine connection for measuring spool position, load-measuring device for detecting compressor operating workload demand, motor driver with it is fixed
Frequency compressor connects；Bypass spool position sensor, bypass guiding valve action drives device, load-measuring device, motor driver with
Controller signals connect.
Further, the motor driver is set as can be achieved to determine frequency motor speed double speed or multi-speed operation and in speed
It is switched between degree gear.
Further, it includes at least one winding to determine frequency motor, switches the number of poles and rotating speed of winding by the mode of connection；Electricity
Machine driver include at least one soft strater and with two/multiple contactors；Soft strater is selected by two/multiple contactors
Selecting property connects machine winding.
Further, it includes at least one set of high speed winding and at least one set of low speed winding to determine frequency motor；It is corresponding, motor
Driver includes a high speed soft strater and a low speed soft strater and at least one breaker；Breaker is soft with low speed
Starter and high speed soft strater are separately connected；High speed soft strater is connect with the high speed winding for determining frequency motor；Low speed soft start
Device is connect with the low speed winding for determining frequency motor.
Further, when further including at least one set of rotating speed in invariable frequency compressor between high speed winding and low speed winding
Middling speed winding when, also set up several starting contactors in the soft strater power control cabinet；The output of its high speed soft strater
End is connected by the high speed winding of a starting contactor and invariable frequency compressor；It is arranged on the output end of low speed soft strater several
Starting contactor arranged side by side, several starting contactors arranged side by side connect low speed winding and each middling speed in the way of docking one by one
Winding.
Further, a breaker is respectively set in front of high speed soft strater and a low speed soft strater；Two disconnected
Road device is connected in parallel on power supply.
Further, a disconnecting switch QS is connected on the front main road of two breakers；It is made up of disconnecting switch QS
Two breakers are selectively connect with respective soft strater.
Using the above-mentioned helical-lobe compressor control method for determining the operation of frequency speed-changing, it is characterised in that：It is in motor
When different rotating speeds are run, controller obtains workload demand according to load-measuring device, and bypass spool position sensor detects guiding valve
Open position signal, controller turn according to workload demand and spool valve position signal, by motor driver come regulation motor operation
Speed realizes multi-speed output and/or switching, and adjusts bypass guiding valve open position by bypassing guiding valve action drives device, and bypass is made to slide
Valve opening position be in setting open range, the open range make guiding valve open position remain always with motor speed to
The trend of the high open position of motor low-speed running and guiding valve position is run.
Further, realize that three speed export and/or switch specific stream by motor driver come regulation motor running speed
Journey is as follows：
When invariable frequency compressor high-speed cruising, guiding valve open position is detected, such as guiding valve open position≤H% and when having off-load demand is fixed
Frequency compressor cuts middling speed operation, otherwise continues to run under high-speed cruising state；H% is the compressor set in the controller
Guiding valve open position lower limit when high-speed cruising；
When middling speed is run, guiding valve open position is detected, such as guiding valve open position≤M% and when having off-load demand, invariable frequency compressor
Cut low speed operation；If guiding valve position is 100% and when having increment of load demand, invariable frequency compressor cuts high-speed cruising, makes guiding valve aperture
Position is in H%~100%；Otherwise continue to run under middling speed operating status, keep middling speed operation guiding valve open position be M%~
100%；Wherein, M% is guiding valve open position lower limit when compressor middling speed is run；
When low speed is run, guiding valve open position is detected, if 100% and there is being increment of load demand in guiding valve position, is then switched to middling speed operation,
It is M%~100% to keep the guiding valve open position of middling speed operation；Otherwise continue to keep low speed operation, keep the guiding valve of low speed operation
Open position is N%~100%；Wherein, N% is guiding valve open position lower limit when compressor low speed is run.
Further, double speed output and/or the specific stream of switching are realized come regulation motor running speed by motor driver
Journey is as follows：
Controller sets the guiding valve open position lower limit of bypass guiding valve as H%；That is guiding valve open position ranging from H%~100%, it is right
Compressor output capacity range 50%~100% is answered, at high speed, when guiding valve open position is moved to H%, and helical-lobe compressor
When capacity also needs further to turn down, helical-lobe compressor will switch to slow-speed of revolution operation, guiding valve open position model when the slow-speed of revolution is run
It is 0~100% to enclose, corresponding compressor output capacity range：Minimum load~50%.
Further, when motor driver power initiation major loop configures two soft straters, the control of high speed soft strater
The high speed winding of motor, low speed soft strater control the low speed winding of motor；Between high speed soft strater and low speed soft strater
Output interlocking is shared the operation of motor, is started jointly；Input signal and guiding valve position of the system controller according to load-measuring device
Confidence number adjusts bypass spool position by bypassing guiding valve action drives device, and is run come regulation motor by motor driver
Rotating speed；When motor different rotating speeds are run, bypass guiding valve open position is adjusted according to setting range.
Further, the upper current limit of high speed soft strater is determined by the rotating speed N0 of highest winding, low speed soft strater
Upper current limit is that the rotating speed N1 of intermediate speed winding determines that winding matching rule corresponds to：Rotating speed N0 >=winding of highest winding
The rotating speed N1 of rotating speed ＞ intermediate speed windings is driven by high speed soft start；The rotating speed N1 of winding rotating speed≤intermediate speed winding；
All driven by low speed soft strater.
Further, electric motor starting mode is soft start, and start-up mode is slope current pattern, to electric motor starting current peak
Value current limliting adjusts and starts voltage, and electric current, which smoothly rises, makes motor speed reach rated speed completion electric motor starting, the high speed of motor
Winding corresponds to a high speed soft strater, and Protection parameters are limited by high speed current protection, and starting current is also limited according to high speed electric current
System ensures that starting current is smooth；The low speed winding of motor corresponds to low speed soft strater, and Protection parameters are pressed low speed current protection, opened
Streaming current ensures that starting current is smooth also according to low speed current limit.
Further, motor speed switching mode is：When cutting low speed or middling speed at a high speed, first high speed soft strater stops defeated
Go out, after the motor free parking several seconds, start low speed soft strater, starting motor makes motor operation in low speed or middling speed；In the middle
When speed cuts low speed, first low speed soft strater stops output, and after the motor free parking several seconds, machine winding switches from middling speed winding
To low speed winding, it is then again started up low speed soft strater, starting motor makes motor operation in low speed；When low speed cuts high speed,
First low speed soft strater stops output, after the motor free parking several seconds, starts high speed soft strater, and starting motor makes motor transport
Row is in high speed.
The beneficial effects of the invention are as follows：
1, determine frequency helical-lobe compressor using determine frequency double speed or multi-speed driving, bypass guiding valve, spool position sensor, main control
Device, when compressor different rotating speeds being made to run, guiding valve controls in rational stroke range, reaches fully loaded and sub-load high efficiency
Operation；
When 2, being used to determine frequency screw rod air-conditioner set, frequency conversion tank need not be configured, in identical COP at full capacity and sub-load COP phases
Under the premise of, unit overall cost reduces by 10% or more than frequency conversion screw air-conditioner set；
When 3, being used to determine frequency screw rod air-conditioner set, 50% and following sub-load COP is higher by 20 than determining frequency constant speed screw rod air-conditioner set
~30%, energy-saving effect is apparent.
4, motor controller major loop configures two soft straters, and soft strater drives high speed winding, and one soft to open
Dynamic device drives low speed winding, and output interlocking between soft strater is shared the operation of motor, started, it is frequent can to meet motor jointly
Start, extends the drive system service life.
5, soft strater is spliced directly to motor binding post, double-speed motor six roots of sensation binding post, soft strater only use respectively with
Motor docks 6 groups of power cables, and wiring is simple.
6, two soft strater parameters of major loop configuration are matched with double-speed motor winding respectively, and high current soft strater drives
Dynamic high-speed electric expreess locomotive winding, low current soft strater drive slowspeed machine winding, and parameter is corresponding with high, low speed motor, and protection is more pacified
Entirely, performance is more preferable；
7, using soft strater driving motor, electric current is smooth in start-up course, and starting current peak value can adjust, and start-up mode makes
With slope current scheme, starting current can be made smooth, to high speed, slowspeed machine start up curve more matches.Without secondary pulse.It is soft
Starter ontology has than more comprehensive defencive function（/ under-voltage protection is crossed, anti-phase is protected, and unbalance protection of three-phase current is defeated
Enter/export phase shortage etc.）More comprehensively to electric motor protecting, safer.
Description of the drawings
Fig. 1 is the screw compressor capacity Control system architecture original for determining the operation of frequency speed-changing implemented according to the present invention
Reason figure.
Fig. 2 is three speed operation of screw compressor capacity control system of the present invention and the control logic figure for switching.
Reference numeral is in Fig. 1-2：Invariable frequency compressor 1, bypass guiding valve action drives device 4, motor driver 5, load measuring
Measure device 6, system controller 7, bypass guiding valve 8, spool position sensor 9.
Fig. 3 is structure principle chart of the motor driver of the present invention based on double-speed motor drive system.
Fig. 4 is circuit structure of the motor driver of the present invention based on the one of specific embodiment of double-speed motor drive system
Figure.
Fig. 5 is the major loop structure figure that motor driver of the present invention is driven based on single soft strater.
Fig. 6 is the major loop structure figure that motor driver of the present invention drives another embodiment based on single soft strater.
Fig. 7 is motor driver double speed of the present invention operation and method for handover control flow chart.
Reference numeral is as follows in Fig. 3-7：1, invariable frequency compressor (machine winding 1,2,3 therein be high speed winding, motor around
Group 4,5,6 is low speed winding), 2, soft strater power control cabinet（QM1 is high speed soft strater, and QM2 is low speed soft strater, and QF is
Breaker）, 3, controller (CB).
Fig. 8 is the structural schematic diagram that motor driver 5 of the present invention is driven based on multispeed electric machine.
Fig. 9 is the circuit structure diagram for the specific embodiment that motor driver 5 of the present invention is driven based on multispeed electric machine.
Figure 10 is that invention motor driver 5 of the present invention is run and method for handover control stream based on three speed that multispeed electric machine drives
Cheng Tu.
Specific implementation mode
Fig. 1 is the screw compressor capacity Control system architecture original for determining the operation of frequency speed-changing implemented according to the present invention
Reason figure.Including invariable frequency compressor 1, bypass guiding valve action drives device 4, motor driver 5, load-measuring device 6, system controller
7, guiding valve 8 is bypassed；Invariable frequency compressor 1 is helical-lobe compressor and determines the combination of frequency motor, by number of pole-pairs switching come regulation motor
Rotating speed, the bypass guiding valve 8 of adjustable capacity is equipped on helical-lobe compressor, and bypass guiding valve 8 connects with bypass guiding valve action drives device 4
It connects and is controlled by it；It is additionally provided with spool position sensor 9, bypass spool position sensor 9 is connect with helical-lobe compressor to be used for
Measure spool position；5 functionality of motor driver is connected to motor to realize that double speed or multi-speed are run；Load-measuring device 6 is used
In detection compressor operating workload demand；Bypass spool position sensor 9, bypass guiding valve action drives device 4, load-measuring device
6, motor driver 5 is connect with 7 signal of system controller.
Using the control method of the above-mentioned helical-lobe compressor and capacity control system for determining the operation of frequency speed-changing, feature
It is：It bypasses spool position sensor 9 and detects spool valve position signal, system controller 7 is according to 6 input signal of load-measuring device
And spool valve position signal, 8 position of bypass guiding valve is adjusted by bypassing guiding valve action drives device 4, and adjust by motor driver 5
It saves motor running speed and realizes multi-speed output；Or when motor different rotating speeds are run, system controller 7 sets bypass guiding valve 8
Fixed different moveable position range.
The characteristics of determining frequency helical-lobe compressor is, by the pressure ratio of design, guiding valve position is imitated higher closer to full potential energy.Under low capacity
When output, compressor is set to be run under compared with low speed, guiding valve position higher state as far as possible, to obtain higher efficiency.
Control rotating speed simultaneously matches spool position, it is therefore an objective to so that compressor is in power minimum（Efficiency highest）State, lift
A example：Three ram compressions contract the capacity of confidential output 30%, and theoretically there are three types of the way of outputs：1. high speed（3000r/min）+ guiding valve
30%；2. middling speed（1500r/min）+ guiding valve 60%；3. low speed（1000r/min）+ guiding valve 90.9%；By repeatedly grinding for the present invention
Study carefully and test, find by the 3. kind mode export efficiency highest.
In order to further realize this control method, the efficiency highest output of the 3. kind mode is realized, the present invention is using such as
Control flow shown in Fig. 2（Control logic for three speed operations）：
When 1 high-speed cruising of invariable frequency compressor, spool position is detected, such as guiding valve position≤H% and when having off-load demand, invariable frequency compressor
1 incision middling speed operation, otherwise continues to run under high-speed cruising state；When H% is compressor high-speed cruising, under valve position movement
Limit；
When middling speed is run, spool position is detected, such as guiding valve position≤M% and when having off-load demand, invariable frequency compressor 1 cuts low speed fortune
Row；If guiding valve position is 100% and when having increment of load demand, invariable frequency compressor 1 cuts high-speed cruising, make spool position H%~
100%；Otherwise continue to run under middling speed operating status, it is M%~100% to keep the spool position of middling speed operation；Wherein, M% is
When compressor middling speed is run, valve position moves lower limit；
When low speed is run, spool position is detected, if 100% and there is being increment of load demand in guiding valve position, then middling speed operation is switched to, keeps
The spool position of middling speed operation is M%~100%；Otherwise continue to keep low speed operation, it is N% to keep the spool position of low speed operation
~100%；Wherein, when N% is that compressor low speed is run, valve position moves lower limit.
Control logic can also be started by low speed or middling speed as shown in Figure 2.No matter high speed or low rate start, as long as
Operation, just the position of workload demand combination guiding valve as shown in Figure 2 can to adjust.
The specific embodiment that compressor starts according to the method described above is as follows：For being run by high-speed electric expreess locomotive, guiding valve is fixed
Position is 50% in 50%, at this time output capacity, and higher than target load, load-measuring device 6 feeds back to system controller 7, needs to subtract
It carries.System controller 7 sends instructions to motor driver 5：Stop high-speed electric expreess locomotive, speed motor in startup, when startup, guiding valve can move
It moves to 66%, load at this time is 33%, and higher than target load, load-measuring device 6 feeds back to system controller 7, needs to continue
Off-load.System controller 7 sends instructions to motor driver 5：Speed motor in stopping starts slowspeed machine, and bypass guiding valve 8 can root
According to the feedback of load-measuring device 6, system controller 7 sends instructions to spool actuation device 4, and bypass guiding valve 8 is allowed to eventually stop at 90.9%
Position, realize 30% load output.（This process is to turn low process by high in compressor capacity, switches at high speed low speed
Process is most common in actual operation.）
It is 0% correspondence helical-lobe compressor minimum capacity to bypass 8 position of guiding valve, is 100% correspondence screw rod pressure to bypass 8 position of guiding valve
For contracting machine maximum capacity, system controller 7 bypasses spool position residing for guiding valve 8 by bypassing the detection of spool position sensor 9,
And when controlling different rotating speeds 8 moveable position of guiding valve in a certain range, to realize helical-lobe compressor at full capacity to minimal negative
High-performance coefficient under lotus.Double speed, the compressor rotary speed of three speed operations and recommendation spool position are referring to 1 table 2 of table.
As shown in table 1, helical-lobe compressors are driven for three speed that high, medium and low rotating speed number of poles is respectively 2,4,6, with number of poles
When being run for 2 high rotating speeds, when defining high rotating speed operation, guiding valve open position lower limit H% is 40~60%, and preferably H% is 50% or so
（Bypass guiding valve moveable position ranging from H%~100% when i.e. high rotating speed is run, corresponding compressor output capacity range 50%~
100%）, when spool position is moved to H%, and screw compressor capacity also needs further to turn down, helical-lobe compressor will switch to
Rotating speed is run in being 4 with number of poles；When rotating speed is run in definition, it is M% that guiding valve open position, which moves lower limit, general M% 50~
75%, preferably 66% or so（I.e. guiding valve open position mobile range is M%~100%, corresponding compressor output capacity range 33%
~50%）, under middle rotating speed, when spool position is moved to M%, and screw compressor capacity also needs further to turn down, screw rod pressure
Contracting machine will switch to number of poles for 6 slow-speed of revolution run, define the slow-speed of revolution operation when, guiding valve open position move lower limit be N%, one
As N% 0~50%,（I.e. guiding valve open position mobile range is N%~100%, corresponding compressor output capacity range：It is minimum
Load~33%）, N values are the smaller the better, and N values are smaller to illustrate that compressor minimum load is smaller, by motor temperature rise and compressor reliability
Aspect influences.
The compressor output capacity and rotating speed, spool position relation table of 1 three speed operation of table
| Compressor output capacity | Rotating speed | Bypass guiding valve moveable position range |
| 50%~100% | It is high（3000r/min） | （H% is 40~60%）H%~100% |
| 33%~50% | In（1500r/min） | （M% is 50~75%）M%~100% |
| Min~33% | It is low（1000r/min） | （N% is 0~50%）N%~100% |
1 explanation of table：100% guiding valve position is suitable with the lower corresponding compressor capacity in H% guiding valves position of high speed under middling speed；100% slides under low speed
Valve position is suitable with the corresponding compressor capacity in M% guiding valves position under middling speed.
As shown in table 2, it is that helical-lobe compressor is driven for the double speed that high rotating speed slow-speed of revolution number of poles is respectively 2 and 4, with extremely right
Number is 1（Number of poles is 2）When high rotating speed operation, controller sets bypass spool position and moves lower limit as H%（Bypass spool position
Mobile range is H%~100%, corresponding compressor output capacity range 50%~100%）, general H% is 50% or so, in height turn
Under speed, as spool position movement≤H%, and when screw compressor capacity also needs further to turn down, helical-lobe compressor will switch to low
Rotating speed is run（Bypass spool position mobile range is N%~100%, corresponding compressor output capacity range：Minimum load~
50%）.
The compressor output capacity and rotating speed, spool position relation table of 2 double speed of table operation
| Compressor output capacity | Rotating speed | Bypass guiding valve moveable position range |
| 50%~100% | It is high（3000r/min） | （H% is 40~60%）H%~100% |
| Min~50% | It is low（1500r/min） | （N% is 0~50%）N%~100% |
2 explanation of table：100% guiding valve position is suitable with the lower corresponding compressor capacity in H% guiding valves position of high speed under low speed.
For motor driver 5 of the invention, there are many embodiment, conventional type of drive, such as " a soft strater
+ two/multiple contactors driving " is readily applicable to the present invention, is also included in protection domain.In addition to this, of the invention into one
Step characteristic is that major loop configures two soft straters, a soft strater driving motor high speed winding, a soft strater driving
The middling speed of motor and low speed winding, output interlocking between soft strater, share the operation of motor, start, can meet motor jointly
Frequent starting extends the drive system service life；Two soft strater parameters of major loop configuration are matched with double-speed motor winding respectively,
High current soft strater drives high-speed electric expreess locomotive winding, low current soft strater to drive slowspeed machine winding, parameter and high, low speed electricity
Machine corresponds to, and protection is safer, and performance is more preferable.When 1 different rotating speeds of invariable frequency compressor being made to run, guiding valve is controlled in rational stroke model
In enclosing, reach fully loaded and sub-load high-efficiency operation.
As shown in figure 3, being structure principle chart of the motor driver of the present invention based on double-speed motor drive system.Wherein control
Device 3 is connect with soft strater power control cabinet 2, and soft strater power control cabinet 2 is connect with invariable frequency compressor 1；It is set in soft strater power control cabinet 2
Set a circuit breaker Q F, a high speed soft strater QM1 and a low speed soft strater QM2；Invariable frequency compressor 1 includes one
Group high speed winding（Machine winding 1,2,3）With one group of low speed winding（Machine winding 4,5,6）.
Be illustrated in figure 4 in Fig. 3 is that one of them is specific real based on double-speed motor drive system for motor driver of the present invention
Apply the circuit structure diagram of example.Wherein, the control terminal of high speed soft strater QM1 and low speed soft strater QM2 are respectively connected in parallel
On controller 3；The input terminal of high speed soft strater QM1 and low speed soft strater QM2（Each terminal of L1, L2, L3）Each mutually difference is simultaneously
It is associated on the three-phase terminal after circuit breaker Q F disconnect switchs；The output end of high speed soft strater QM1（Each terminal of L4, L5, L6）
It is connected in turn on each winding of high speed winding of invariable frequency compressor 1（Machine winding 1,2,3）；The output of low speed soft strater QM2
End（Each terminal of L4, L5, L6）It is connected in turn on each winding of low speed winding of invariable frequency compressor 1（Machine winding 4,5,6）.
Fig. 5 is the major loop structure figure that motor driver 5 of the present invention is driven based on single soft strater.It is to implement in Fig. 4
One mutation embodiment of example, for the difference with Fig. 4 i.e. using two circuit breaker Qs F1 and QF2, each breaker connects a soft start
Then device drives double-speed motor by two soft straters.High speed soft strater QM1 and low speed soft strater QM2 are according to open circuit
The break-make of device QF1 and QF2, are respectively started, and realize and drive double-speed motor based on single soft strater.
Fig. 6 is the major loop structure figure that motor driver 5 of the present invention drives another embodiment based on single soft strater.Its
In Figure 5 a disconnecting switch QS is connected on the front main road of two circuit breaker Qs F1 and QF2；It is made up of disconnecting switch QS
Selectable realize of two soft straters drives double-speed motor based on single soft strater.
Fig. 7 is that electric machine controller of the present invention is based on the operation of above-mentioned double speed and method for handover control flow chart.Wherein：
Electric motor starting mode is soft start, and start-up mode is slope current pattern, and to electric motor starting current peak current limliting, adjusting is opened
Dynamic voltage, electric current, which smoothly rises, makes motor speed reach rated speed completion electric motor starting, and the high speed winding 1,2,3 of motor corresponds to
The soft strater of one high current（QM1）, Protection parameters press high speed current protection, starting current also according to high speed current limit,
Ensure that starting current is smooth；The low speed winding 4,5,6 of motor corresponds to the soft strater of a low speed electric current（QM2）, Protection parameters
By low speed current protection, starting current ensures that starting current is smooth also according to low speed current limit;
Motor high speed and low speed switching mode：When cutting low speed at a high speed, first high speed soft strater QM1 stops output, and motor is free
Starting low speed soft strater QM2 startup motors after the parking several seconds makes motor operation in low speed；When low speed cuts high speed, first low speed
Soft strater QM2 stops output, and starting high speed soft strater QM1 startup motors after the motor free parking several seconds makes motor operation
In high speed;
Two soft straters share the startup of a motor, operation jointly, and one operation of soft strater then another stopping can expire
The demand of sufficient frequent starting, prolongs the service life;
In all startups and operational process, current signal is fed back to controller by soft strater, and controller is according to electric current value protection
The startup of motor and operating condition.
Fig. 8 is the structural schematic diagram that electric machine controller of the present invention is driven based on multispeed electric machine.Its difference started with double speed
It is to match multiple contactors after a soft strater.Specially：Controller 3 is connect with soft strater power control cabinet 2, soft strater electricity
Control cabinet 2 is connect with invariable frequency compressor 1；In soft strater power control cabinet 2 be arranged a circuit breaker Q F, a high speed soft strater QM1,
One low speed soft strater QM2 and N number of starting contactor（KM1~KMN is starting contactor）；Invariable frequency compressor 1 includes more
Group winding, at least one set of high speed winding（Machine winding 1,2,3）With one group of low speed winding（Machine winding N, N+1, N+2）.
Fig. 9 is the circuit structure diagram for the specific embodiment that electric machine controller of the present invention is driven based on multispeed electric machine.Its
In, the control terminal of high speed soft strater QM1 and low speed soft strater QM2 are respectively connected in parallel on controller 3；High speed soft start
The input terminal of device QM1 and low speed soft strater QM2（Each terminal of L1, L2, L3）It is each to be mutually connected in parallel on circuit breaker Q F disconnect switchs respectively
On three-phase terminal afterwards；The output end of high speed soft strater QM1（Each terminal of L4, L5, L6）By starting contactor KM1 according to
On the secondary each winding of high speed winding for being connected to invariable frequency compressor 1（Machine winding 1,2,3）；The output end of low speed soft strater QM2
（Each terminal of L4, L5, L6）Parallel opertation at least both ends, wherein one end are connected in turn by starting contactor KMN determines frequency compression
On each winding of low speed winding of machine 1（N、N+1、N+2）；The other end is connected to invariable frequency compressor 1 in turn by starting contactor KM2
Each winding of middling speed winding on（4、5、6）；And so on.
Figure 10 is that invention motor driver 5 of the present invention is run and method for handover control stream based on three speed that multispeed electric machine drives
Cheng Tu.Wherein motor speed switching mode is：When cutting low speed or middling speed at a high speed, first high speed soft strater stops output, motor
After the free parking several seconds, start low speed soft strater, starting motor makes motor operation in low speed or middling speed；When middling speed cuts low speed
When, first low speed soft strater stops output, after the motor free parking several seconds, machine winding from middling speed winding be switched to low speed around
Then group is again started up low speed soft strater, starting motor makes motor operation in low speed；When low speed cuts high speed, first low speed is soft
Starter stops output, after the motor free parking several seconds, starts high speed soft strater, and starting motor makes motor operation in height
Speed.
Before electric motor starting, the control of controller 3 needs the corresponding contactor KMN of winding to be started to be first attracted, and then controls
Soft strater QM starts.
When switching, controller first stops the starter QM to work, then discharges the corresponding contactor KM of winding, then again
Start the starter QM for needing to run, then is connected to the corresponding contactor KM of winding.
First high speed soft strater QM1 stops output, starts low speed soft strater QM2 after the motor free parking several seconds and starts
Motor makes motor operation in low speed；When hit at a high speed speed when, middling speed soft strater QM2, which starts motor, makes motor operation in middling speed;
When cutting low speed from middling speed, low speed soft strater QM2, which starts motor, makes motor operation in low speed.
Multi-speed（Speed stage is more than 2）The matching rule of motor and soft strater：High current soft strater driving high speed electricity
Machine winding, low current soft strater drive slowspeed machine winding.
The upper current limit of high speed soft strater is determined that the upper current limit of low speed soft strater is by the rotating speed N0 of highest winding
The rotating speed N1 of intermediate speed winding determines that winding matching rule corresponds to：Among the rotating speed N0 of highest winding >=winding rotating speed ＞
The rotating speed N1 of rotating speed winding is driven by high speed soft start；The rotating speed N1 of winding rotating speed≤intermediate speed winding；It is all soft by low speed
Starter drives.
Double speed and the configuration of multispeed electric machine drive system major loop are not limited to the above form, all to drive double speed using soft strater
Or the scheme of multispeed electric machine is all within the scope of the present invention..
The present invention has the beneficial effect that as a result,：
1, determine frequency helical-lobe compressor using determine frequency double speed or multi-speed driving, bypass guiding valve, spool position sensor, main control
Device, when compressor different rotating speeds being made to run, guiding valve controls in rational stroke range, reaches fully loaded and sub-load high efficiency
Operation；
When 2, being used to determine frequency screw rod air-conditioner set, frequency conversion tank need not be configured, in identical COP at full capacity and sub-load COP phases
Under the premise of, unit overall cost reduces by 10% or more than frequency conversion screw air-conditioner set；
When 3, being used to determine frequency screw rod air-conditioner set, 50% and following sub-load COP is higher by 20 than determining frequency constant speed screw rod air-conditioner set
~30%, energy-saving effect is apparent.
4, motor controller major loop configures two soft straters, and soft strater drives high speed winding, and one soft to open
Dynamic device drives low speed winding, and output interlocking between soft strater is shared the operation of motor, started, it is frequent can to meet motor jointly
Start, extends the drive system service life.
5, soft strater is spliced directly to motor binding post, double-speed motor six roots of sensation binding post, soft strater only use respectively with
Motor docks 6 groups of power cables, and wiring is simple.
6, two soft strater parameters of major loop configuration are matched with double-speed motor winding respectively, and high current soft strater drives
Dynamic high-speed electric expreess locomotive winding, low current soft strater drive slowspeed machine winding, and parameter is corresponding with high, low speed motor, and protection is more pacified
Entirely, performance is more preferable；
7, using soft strater driving motor, electric current is smooth in start-up course, and starting current peak value can adjust, and start-up mode makes
With slope current scheme, starting current can be made smooth, to high speed, slowspeed machine start up curve more matches.Without secondary pulse.It is soft
Starter ontology has than more comprehensive defencive function（/ under-voltage protection is crossed, anti-phase is protected, and unbalance protection of three-phase current is defeated
Enter/export phase shortage etc.）More comprehensively to electric motor protecting, safer.
Claims (14)
1. a kind of screw compressor capacity control system for determining the operation of frequency speed-changing, includes containing the screw compression for determining frequency motor
Machine is equipped with the bypass guiding valve of adjustable capacity on helical-lobe compressor, also sets up bypass guiding valve action drives device, motor driving
Device, controller and load-measuring device, bypass guiding valve connect with bypass guiding valve action drives device signal and are moved by bypass guiding valve
Make driver control, it is characterised in that：Bypass spool position sensor is also set up, spool position sensor and screw compression are bypassed
Machine connection for measuring spool position, load-measuring device for detecting compressor operating workload demand, motor driver with it is fixed
Frequency compressor connects；Bypass spool position sensor, bypass guiding valve action drives device, load-measuring device, motor driver with
Controller signals connect.
2. the screw compressor capacity control system according to claim 1 for determining the operation of frequency speed-changing, feature exist
In：The motor driver is set as can be achieved to determine frequency motor speed double speed or multi-speed operation and be cut between speed stage
It changes；It includes at least one winding to determine frequency motor, switches the number of poles and rotating speed of winding by the mode of connection.
3. the screw compressor capacity control system according to claim 1 or 2 for determining the operation of frequency speed-changing, feature
It is：Motor driver include at least one soft strater and with two/multiple contactors；Soft strater by two/it is multiple
Contactor selectively connection machine winding.
4. the screw compressor capacity control system according to claim 3 for determining the operation of frequency speed-changing, feature exist
In：It includes at least one set of high speed winding and at least one set of low speed winding to determine frequency motor；Corresponding, motor driver includes one
High speed soft strater and a low speed soft strater and at least one breaker；Breaker and low speed soft strater and high speed are soft
Starter is separately connected；High speed soft strater is connect with the high speed winding for determining frequency motor；Low speed soft strater and determine frequency motor
Low speed winding connects.
5. the screw compressor capacity control system according to claim 4 for determining the operation of frequency speed-changing, feature exist
In：When in invariable frequency compressor further including middling speed winding of at least one set of rotating speed between high speed winding and low speed winding, institute
It states and also sets up several starting contactors in soft strater power control cabinet；The output end of its high speed soft strater is connect by a startup
The high speed winding of tentaculum and invariable frequency compressor connects；Several startup contacts arranged side by side are set on the output end of low speed soft strater
Device, several starting contactors arranged side by side connect low speed winding and each middling speed winding in the way of docking one by one.
6. the screw compressor capacity control system according to claim 4 for determining the operation of frequency speed-changing, feature exist
In：A breaker is respectively set in front of high speed soft strater and a low speed soft strater；Two breakers are connected in parallel on power supply
On.
7. the screw compressor capacity control system according to claim 6 for determining the operation of frequency speed-changing, feature exist
In：A disconnecting switch QS is connected on the front main road of two breakers；It is optional that two breakers are constituted by disconnecting switch QS
It is connect with respective soft strater with selecting.
8. using the screw compressor capacity control system that can determine the operation of frequency speed-changing described in the claims any one of 1-7
Capacity control method, it is characterised in that：When motor is in different rotating speeds operation, controller is obtained according to load-measuring device
Workload demand, bypass spool position sensor detect guiding valve open position signal, and controller is according to workload demand and spool position
Signal realizes multi-speed output and/or switching by motor driver come regulation motor running speed, and by bypassing guiding valve action
Driver adjusts bypass guiding valve open position, and bypass guiding valve open position is made to be in the open range of setting, the open range
Make guiding valve open position remain with motor speed always to run to the trend of the high open position of motor low-speed running and guiding valve position.
9. using the volume controlled side for the screw compressor capacity control system that can determine the operation of frequency speed-changing described in claim 8
Method, it is characterised in that：By motor driver three speed outputs and/or switching detailed process are realized come regulation motor running speed such as
Under：
When invariable frequency compressor high-speed cruising, guiding valve open position is detected, such as guiding valve open position≤H% and when having off-load demand is fixed
Frequency compressor cuts middling speed operation, otherwise continues to run under high-speed cruising state；H% is the compressor set in the controller
Guiding valve open position lower limit when high-speed cruising；
When middling speed is run, guiding valve open position is detected, such as guiding valve open position≤M% and when having off-load demand, invariable frequency compressor
Cut low speed operation；If guiding valve position is 100% and when having increment of load demand, invariable frequency compressor cuts high-speed cruising, makes guiding valve aperture
Position is in H%~100%；Otherwise continue to run under middling speed operating status, keep middling speed operation guiding valve open position be M%~
100%；Wherein, M% is guiding valve open position lower limit when compressor middling speed is run；
When low speed is run, guiding valve open position is detected, if 100% and there is being increment of load demand in guiding valve position, is then switched to middling speed operation,
It is M%~100% to keep the guiding valve open position of middling speed operation；Otherwise continue to keep low speed operation, keep the guiding valve of low speed operation
Open position is N%~100%；Wherein, N% is guiding valve open position lower limit when compressor low speed is run.
10. using the volume controlled for the screw compressor capacity control system that can determine the operation of frequency speed-changing described in claim 8
Method, it is characterised in that：By motor driver double speed output and/or switching detailed process are realized come regulation motor running speed
It is as follows：
When invariable frequency compressor high-speed cruising, guiding valve open position is detected, such as guiding valve open position≤H% and when having off-load demand is fixed
Frequency compressor cuts low speed operation, otherwise continues to run under high-speed cruising state；H% is the compressor set in the controller
Guiding valve open position lower limit when high-speed cruising；When low speed is run, guiding valve open position is detected, as 100% and there is being increment of load in guiding valve position
Demand is then switched to high-speed cruising, and it is H%~100% to keep the guiding valve open position of high-speed cruising；Otherwise continue to keep low speed fortune
Row, it is N%~100% to keep the guiding valve open position of low speed operation；Wherein, N% is guiding valve open position when compressor low speed is run
Lower limit.
11. using the appearance for the screw compressor capacity control system that can determine the operation of frequency speed-changing described in one of claim 8-10
Amount control method, it is characterised in that：When motor driver power initiation major loop configures two soft straters, high speed soft strater
The high speed winding of motor is controlled, low speed soft strater controls the low speed winding of motor；High speed soft strater and low speed soft strater
Between output interlocking, share jointly motor operation, start；System controller is according to the input signal and cunning of load-measuring device
Valve position signal adjusts bypass spool position by bypassing guiding valve action drives device, and by motor driver come regulation motor
Running speed；When motor different rotating speeds are run, bypass guiding valve open position is adjusted according to setting range.
12. using the appearance for the screw compressor capacity control system that can determine the operation of frequency speed-changing described in one of claim 8-10
Amount control method, it is characterised in that：The upper current limit of high speed soft strater determines by the rotating speed N0 of highest winding, low speed soft start
The upper current limit of device is that the rotating speed N1 of intermediate speed winding determines that winding matching rule corresponds to：The rotating speed N0 of highest winding >=
The rotating speed N1 of winding rotating speed ＞ intermediate speed windings is driven by high speed soft start；Winding rotating speed≤intermediate speed winding turns
Fast N1；All driven by low speed soft strater.
13. using the appearance for the screw compressor capacity control system that can determine the operation of frequency speed-changing described in one of claim 8-10
Amount control method, it is characterised in that：Electric motor starting mode is soft start, and start-up mode is slope current pattern, to electric motor starting
Current peak current limliting adjusts and starts voltage, and electric current, which smoothly rises, makes motor speed reach rated speed completion electric motor starting, motor
High speed winding correspond to a high speed soft strater, Protection parameters by high speed current protection limit, starting current also according at a high speed
Current limit ensures that starting current is smooth；The low speed winding of motor corresponds to low speed soft strater, and Protection parameters are protected by low speed electric current
Shield, starting current ensure that starting current is smooth also according to low speed current limit.
14. using the appearance for the screw compressor capacity control system that can determine the operation of frequency speed-changing described in one of claim 8-10
Amount control method, it is characterised in that：Motor speed switching mode is：When cutting low speed or middling speed at a high speed, first high speed soft strater
Stop output, after the motor free parking several seconds, start low speed soft strater, start motor make motor operation low speed or in
Speed；When middling speed cuts low speed, first low speed soft strater stops output, and after the motor free parking several seconds, machine winding is from middling speed
Winding is switched to low speed winding, is then again started up low speed soft strater, and starting motor makes motor operation in low speed；When low speed is cut
When high speed, first low speed soft strater stops output, after the motor free parking several seconds, starts high speed soft strater, starts motor
Make motor operation in high speed.
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| CN201810483330.9A CN108468643A (en) | 2018-05-18 | 2018-05-18 | It can determine the screw compressor capacity control system and method for the operation of frequency speed-changing |
| PCT/CN2019/081436 WO2019218796A1 (en) | 2018-05-18 | 2019-04-04 | Capacity control system and method for screw compressor capable of switching running rotating speed at constant frequency |
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| CN201810483330.9A CN108468643A (en) | 2018-05-18 | 2018-05-18 | It can determine the screw compressor capacity control system and method for the operation of frequency speed-changing |
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| CN109387000A (en) * | 2018-10-19 | 2019-02-26 | 珠海格力电器股份有限公司 | A kind of continuative energy regulating device, adjusting method and the refrigeration system of compressor |
| WO2019218796A1 (en) * | 2018-05-18 | 2019-11-21 | 麦克维尔空调制冷(武汉)有限公司 | Capacity control system and method for screw compressor capable of switching running rotating speed at constant frequency |
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