CN105020951B - A kind of Parallel sets energy-saving run regulating system and its control method - Google Patents
A kind of Parallel sets energy-saving run regulating system and its control method Download PDFInfo
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Abstract
During the technical problem to be solved in the present invention is existing control method, toggle speed can not meet requirement, the problem of easily there is high frequent startup, to solve the above problems, a kind of Parallel sets energy-saving run regulating system and its control method are provided, including refrigeration unit, refrigeration unit successively with condenser, choke valve, evaporator is connected, evaporator is connected by aspirating air pipe with refrigeration unit, evaporator is arranged in freezer, refrigeration unit is connected with PLC, PLC is connected with touch-screen, inspiratory pressure sensor is set on aspirating air pipe, inspiratory pressure sensor is connected with PLC.The present invention, as control object, can be applied to freezer group using pressure of inspiration(Pi), it is thus also avoided that terminal temperature control lags behind the output of Parallel sets cooling capacity in refrigeration system, it is to avoid the frequent starting of compressor.
Description
Technical field
The present invention relates to a kind of refrigeration control method, and in particular to a kind of Parallel sets energy-saving run adjustment control method.
Background technology
With the domestic commercial development for freezing market, parallel compressor unit is obtained because of its good peak modulation capacity and energy conservation characteristic
Being widely recognized as market is arrived.Particularly in recent years, cold scope is big, run high efficient and reliable because it has for screw parallel unit
Etc. outstanding feature, the first choice as low-temperature receiver needed for the field such as big-and-middle-sized freezer and freeze tunnel.
The traditional operation adjusting meaning of Parallel sets has differential gap regulative mode and linear zone regulative mode in the market
Two kinds.
Differential gap regulative mode：
Differential gap control is applied to all loads.According to the operating condition of refrigeration system, some pressure value is set（Temperature
Value）, neutral sector width is symmetrical centered on setting value, there is upper and lower bound.If pressure of inspiration(Pi)（Temperature of ice house）Value is upper
In limit and lower range, the compressor number of units put into operation in control system is not changed.Work as pressure of inspiration(Pi)（Temperature of ice house）It is super
When crossing upper range, loaded by the short compressor of run time run time on duty by turns.Work as pressure of inspiration(Pi)（Temperature of ice house）It is super
When crossing lower range, unloaded by the compressor of run time long operational time on duty by turns.It is the every compressor of protection, can sets
Related delay parameter：With the startup continuous twice between compressor and different compressors and continuous stopping delay twice.Such as Fig. 1 institutes
It is shown as 3 and waits working condition of the positive displacement compressor under neutral regulation, compressor C1 run times is thought under start-up command state
Most short, compressor C2 takes second place, and compressor C3 is most long；Think that compressor C3 run times are most long under halt instruction state, compress
Machine C2 takes second place, and compressor C1 is most short.So, order when compressor is loaded is first to load C1, during loading delay adjustmentses
Between after loading C2, loading the delay adjustmentses time after load C3, similarly, unload compressor when be C3, C2, C1.
Controller in the regulative mode of differential gap can be the simple controller or PLC of single-chip microcomputer encapsulation；Control
Object can be pressure of inspiration(Pi) or temperature of ice house.
Linear zone regulative mode：
According to the operating condition of refrigeration system, some pressure value is set（Temperature value）, then symmetrically set setting value is upper and lower
A linearly interval is put, and according to number of compressors by this interval equipartition, each interval represents a pressure duty grade.
When pressure increase（Temperature is raised）, and entering different operating grade, controller drives correspondence compressor to devote oneself to work successively；Work as pressure
Power reduces（Temperature is reduced）, and each job class is exited, compressor stops successively.Therefore, pressure of inspiration(Pi)（Temperature of ice house）
On linear zone, all compressor operatings；Pressure of inspiration(Pi)（Temperature of ice house）Under linear zone, all compressors stop.Such as Fig. 2
It show 3 and waits working condition of the positive displacement compressor under linear zone regulation, thinks that compressor C1 is run under start-up command state
Time is most short, and compressor C2 takes second place, and compressor C3 is most long；Think that compressor C3 run times are most long under halt instruction state,
Compressor C2 takes second place, and compressor C1 is most short.So, work as pressure of inspiration(Pi)（Temperature of ice house）When value is more than SET-1 Δ P, during by operation
Between the short compressor C1 of run time on duty by turns loaded, work as pressure of inspiration(Pi)（Temperature of ice house）During more than SET+1 Δ P, by operation
The short compressor C2 of time run time on duty by turns is loaded, and works as pressure of inspiration(Pi)（Temperature of ice house）During more than SET+2 Δ P, by fortune
The short compressor C3 of row time run time on duty by turns is loaded.Work as pressure of inspiration(Pi)（Temperature of ice house）When value is less than SET+1 Δ P,
Unloaded by the compressor C3 of run time long operational time on duty by turns, work as pressure of inspiration(Pi)（Temperature of ice house）Less than SET-1 Δs P
When, unloaded by the compressor C2 of run time long operational time on duty by turns, work as pressure of inspiration(Pi)（Temperature of ice house）Less than SET-2
During Δ P, unloaded by the compressor C1 of run time long operational time on duty by turns.
Controller in linear zone regulative mode can be the simple controller or PLC of single-chip microcomputer encapsulation；Control
Object can be pressure of inspiration(Pi) or temperature of ice house.
The comparison of two kinds of regulative modes：
When using pressure of inspiration(Pi) control, go for refrigeration unit and provide low-temperature receiver to single freezer, be also applied for system
Cold group gives freezer group（I.e. multiple freezers）Low-temperature receiver is provided.
In the regulative mode of differential gap, when pressure of inspiration(Pi) is more than the upper limit, it is necessary to load compressor, but add per compressor
The time interval of load realizes that auto-adaptive controling ability is poor by fixed time interval.（Self Adaptive Control is exactly that it can be repaiied
Just the characteristic of oneself is with the change of adaption object and the dynamic characteristic of disturbance）.Use with upper type, it may appear that following problem：
If 1. the time interval of setting is longer, the startup time of whole unit is also longer, the temperature of user end setting
All already exceed the upper limit of setting, although liquid supply electromagnetic valve is opened, but is due to that interval time is longer, compressor does not add also
Carry, the pressure of inspiration(Pi) of system is also not reaching to the corresponding evaporating pressure of temperature of end setting, such temperature is impossible to by under
Come, it is impossible to meet requirement of the user to toggle speed.
If 2. the time interval of setting is shorter, the temperature of freezer or freeze tunnel does not drop to the temperature of needs also
When, pressure of inspiration(Pi) is just relatively low, is easily caused the alarm of pressure of inspiration(Pi) lower limit, and unit is all cut off.
In linear zone regulative mode, because interval is after average, adjustable range is narrow.If some engineering is 5
Compressor parallel, the temperature range that client needs is in 32 DEG C of 36 DEG C ~ ﹣ of ﹣, and its evaporating temperature is in 37 DEG C of 41 DEG C ~ ﹣ of ﹣, evaporating pressure
Between 1.00bara ~ 1.21bara, only 0.21bar difference.This difference is divided into 5 intervals, each interval reaches
To 0.04bar, and sensor gathers the data come, if not passing through Digital smooth filtering, still there is fluctuation, so small
Interval, along with the fluctuation of data, as long as the change of load somewhat, compressor begins to regulation, and such compressor easily goes out
Existing frequent starting.
When using temperature of ice house control, it may be only available for refrigeration unit and provide low-temperature receiver to single freezer.
In linear zone regulative mode, it can avoid using the narrow appearance of adjustable range occurred in pressure of inspiration(Pi) regulation
Frequent starting, but controller in the market（Single-chip microcomputer encapsulation）Product is all controller manufacturer oneself research and development, at present
As the product of control object it is no using temperature in the regulation of differential gap.
No matter using differential gap regulation, or using linear zone regulation, when using temperature as control object, it is applied
Scope is narrow.Because the product in terms of this be only used for refrigeration unit as single freezer low-temperature receiver when just be applicable,
Which when multiple freezers in use, occurring as soon as the temperature of multiple freezers, do not know using the temperature of freezer thus to control system
Cold group.
Fig. 4 is the more system configuration mode of design and use in the market.
As shown in figure 4, being connected by 401 refrigeration units by pipeline and 402 condensers, 402 condensers pass through pipeline and 403
Choke valve is connected, and 403 choke valves are connected by pipeline and 404 evaporators（Evaporator is positioned in freezer）, 404 evaporators pass through
Pipeline and 401 refrigeration units are connected；Controller 405 is connected by cable and temperature of ice house sensor 406.Refrigerant is by 401 systems
After compressor compresses in cold group, become the superheated steam of HTHP, after being condensed into 402 condensers, become low
The liquid of warm high pressure, into after 403 choke valves, becomes the liquid-vapor mixture of low-temp low-pressure, overheat is flashed in evaporator 404
After gas, sucked by the compressor in refrigeration unit, complete whole kind of refrigeration cycle.Control therein is used as control using temperature of ice house
Object processed, is adjusted or used using center linear zone regulative mode, control single freezer to be freezed, may be only available for list
Individual freezer.
The content of the invention
During the technical problem to be solved in the present invention is existing control method, toggle speed can not meet requirement, easily go out
The problem of existing high frequent starts, to solve the above problems, providing a kind of Parallel sets energy-saving run adjustment control method.
The purpose of the present invention is realized in the following manner：
A kind of Parallel sets energy-saving run regulating system, including refrigeration unit, refrigeration unit successively with condenser, throttling
Valve, evaporator be connected, evaporator is connected by aspirating air pipe with refrigeration unit, and evaporator is arranged in freezer, refrigeration unit and
PLC is connected, and PLC, which is connected with touch-screen, aspirating air pipe, sets inspiratory pressure sensor, and inspiratory pressure sensor is connected with PLC.
The freezer is the multichannel freezer that is connected in parallel.
A kind of Parallel sets energy-saving run adjustment control method, it comprises the following steps：
（1）The pressure of inspiration(Pi) setting value of unit is set as needed；
（2）Pass through the pressure of inspiration(Pi) measured value of PLC control system the real time measure unit；
（3）Difference x calculating will be carried out between pressure of inspiration(Pi) measured value and pressure of inspiration(Pi) setting value in real time, according to mathematical modeling
F (x), calculates the real-time time interval y of compressor progress plus unloading, and determines that actually compressor carries out adding the real-time of unloading
Time interval；
（4）The real-time time interval for being carried out plus being unloaded according to actually compressor, real-time plus unloading is carried out to compressor.
Step（1）In also to determine the pressure of inspiration(Pi) setting value upper limit and pressure of inspiration(Pi) setting value lower limit simultaneously.
Step（3）In, difference x will be carried out between pressure of inspiration(Pi) measured value and the pressure of inspiration(Pi) setting value upper limit in real time1Calculate,
According to mathematical modeling f1(x1), calculate the real-time time interval y that compressor is loaded1；In real time by pressure of inspiration(Pi) setting value lower limit
Difference x2 calculating is carried out between pressure of inspiration(Pi) measured value, according to mathematical modeling f2 (x2), the reality that compressor is unloaded is calculated
When time interval y2。
Step（3）In, in addition it is also necessary to set maximum load time interval T1max, minimum load time interval T1min, maximum unloading
Time interval T2maxWith minimum discharge time interval T2min, the real-time time interval y loaded when the compressor calculated1Greatly
In maximum load time interval T1maxWhen, the real-time time that compressor is loaded is at intervals of maximum load time interval T1max；When
The real-time time interval y that the compressor calculated is loaded1Less than or equal to maximum load time interval T1max, and be more than or equal to
Minimum load time interval T1minWhen, the real-time time that compressor is loaded is at intervals of f1(x1)；When the compressor calculated enters
The real-time time interval y of row loading1Less than minimum load time interval T1minWhen, the real-time time interval that compressor is loaded
For T1min；The real-time time interval y unloaded when the compressor calculated2More than maximum discharge time interval T2maxWhen, compression
The real-time time that machine is unloaded is at intervals of maximum discharge time interval T2max；When the compressor calculated unloaded it is real-time
Time interval y2Less than or equal to maximum discharge time interval T2max, and more than or equal to minimum discharge time interval T2minWhen, compressor
The real-time time unloaded is at intervals of f2(x2)；The real-time time interval y unloaded when the compressor calculated2Less than most
Small discharge time interval T2minWhen, the real-time time that compressor is unloaded is at intervals of T2min。
Step（4）In, the real-time time interval for being carried out plus being unloaded according to actually compressor is on duty by turns right according to run time
Compressor is carried out in real time plus unloaded.
Relative to prior art, the present invention, as control object, can be applied to freezer group, also avoided using pressure of inspiration(Pi)
In refrigeration system terminal temperature control lags behind the output of Parallel sets cooling capacity, it is to avoid the frequent starting of compressor, and
Loaded and unloaded according to the time on duty by turns per compressor in online group, made every compressor run time balanced, can make
The working condition of Compressor Group more meets actual requirement, can more realize that Parallel sets are wanted to energy-efficient performance and unfailing performance
Ask.
Brief description of the drawings
Fig. 1 is in the prior art using the lower compressor working state schematic representation of differential gap regulation.
Fig. 2 is in the prior art using the lower compressor working state schematic representation of linear zone regulation.
Fig. 3 is using the lower compressor working state schematic representation of present invention regulation.
Fig. 4 is to freeze in the prior art and its control system schematic diagram.
Fig. 5 is refrigeration and its control system schematic diagram in the present invention.
Embodiment
Such as Fig. 5, a kind of Parallel sets energy-saving run regulating system passes through pipeline and 602 condenser phases by 601 refrigeration units
Even, 602 condensers are connected by pipeline and 603 choke valves, and 603 choke valves are connected by pipeline and 604 evaporators（Evaporator is put
It is placed in freezer）, 604 evaporators are connected by pipeline and 601 refrigeration units；PLC605 is passed by cable and unit pressure of inspiration(Pi)
Sensor 606 is connected, while being connected by cable with touch-screen 607.Refrigerant by the compressor compresses in 601 refrigeration units it
Afterwards, become the superheated steam of HTHP, after being condensed into 602 condensers, become the liquid of cryogenic high pressure, into 603 sections
Flow after valve, become the liquid-vapor mixture of low-temp low-pressure, after flashing to overheated gas in evaporator 604, by refrigeration unit
Compressor is sucked, and completes whole kind of refrigeration cycle.
As shown in figure 3, a kind of Parallel sets energy-saving run adjustment control method, it comprises the following steps：
（1）The pressure of inspiration(Pi) setting value of setting unit, is set by 607 touch-screens as needed, its ginseng set
Number sends 605PLC to by cable；
（2）By the pressure of inspiration(Pi) measured value of PLC control system the real time measure unit, inspiratory pressure sensor 606 passes through
Pressure of inspiration(Pi) is simulated mileage according to sending 605PLC progress to and handle and obtains pressure of inspiration(Pi) data by cable；
（3）Difference x calculating will be carried out between pressure of inspiration(Pi) measured value and pressure of inspiration(Pi) setting value in real time, according to mathematical modeling
F (x), calculates the real-time time interval y of compressor progress plus unloading, and determines that actually compressor carries out adding the real-time of unloading
Time interval；
（4）The real-time time interval for being carried out plus being unloaded according to actually compressor, real-time plus unloading is carried out to compressor.
The mathematical modeling of Parallel sets regulation
The difference of founding mathematical models y=f (x), x=between pressure of inspiration(Pi) real-time measurement values and pressure of inspiration(Pi) setting value, y=
Compressor adds discharge time interval.PLC measures pressure of inspiration(Pi) in real time, and in real time sets pressure of inspiration(Pi) measured value and pressure of inspiration(Pi)
Mathematic interpolation is carried out between value, then according to mathematical modeling f (x), the real-time time interval that compressor is carried out plus unloaded is calculated.
Function y=f (x) can be linear function or quadratic function.Linear function modeling is simple, and quadratic function modeling is complicated,
But quadratic function fits the curve ratio linear function come and fits the curve come closer to actual, also can preferably instruct journey
Sequence designer.
The foundation of compressor loads time interval mathematical modeling
Founding mathematical models y1=f1(x1), x1Between=pressure of inspiration(Pi) real-time measurement values and pressure of inspiration(Pi) upper limit set value
Difference, y1=compressor real-time loading time interval.PLC measures pressure of inspiration(Pi) in real time, and in real time by pressure of inspiration(Pi) measured value and suction
Mathematic interpolation is carried out between atmospheric pressure upper limit set value, then according to mathematical modeling f1(x1), calculate what compressor was loaded
Real-time time interval.
Now, in addition it is also necessary to set maximum load time interval（T1max）With minimum load time interval（T1 min）.
When according to mathematical modeling f1(x1) time interval calculated when being more than maximum load time interval, that is, works as y1＞
T1maxWhen, y1=T1max；
When according to mathematical modeling f1(x1) time interval calculated is less than or equal to maximum load time interval, and be more than
During equal to minimum load time interval, by the pressure of inspiration(Pi) force value measured in real time and the difference of pressure of inspiration(Pi) higher limit, according to mathematics
Model f1(x1) calculated, that is, work as T1 min≤y1≤T1maxWhen, y1=f1(x1)；
When according to mathematical modeling f1(x1) time interval calculated when being less than minimum load time interval, that is, works as y1＜
T1maxWhen, y1=T1min；
The explanation exemplified by setting up linear function：
Upper pressure limit is set as 1.5bara, pressure of inspiration(Pi) lower limit is 1.2bara；It is default when the pressure of inspiration(Pi) upper limit and real-time
When the difference for measuring pressure of inspiration(Pi) is 0.5bara, the load time is at intervals of 180s；It is default to work as the pressure of inspiration(Pi) upper limit and pressure of inspiration(Pi)
When the difference measured in real time is 0.1bara, the load time at intervals of 60s, that is, obtains two points, point 1（0.5,180）, point 2
（0.1,60）Linear function can be set up：y1=300x1+30。
Maximum load time interval T is preset again1max=240s；Minimum load time interval T1 min=30s；It can obtain complete as follows
Whole function：
Work as y1During ＜ 30, y1=30
As 30≤y1When≤240, y1=300x1+30
Work as y1During ＞ 240, y1=240
PLC loads timer according to load time interval y1Timing is carried out, when timer value is equal to load time interval
When, C1 is loaded, timer carries out timing again after resetting, when timer value is equal to load time interval, loads C2, similarly add
Carry C3（Compressor C3 run times are most long, and compressor C2 takes second place, and compressor C1 is most short）.
The foundation of compressor unloading time interval mathematical modeling
Founding mathematical models y2=f2(x2), x2Between=pressure of inspiration(Pi) lower limit set value and pressure of inspiration(Pi) real-time measurement values
Difference, y2=compressor unloading real-time time interval.PLC measures pressure of inspiration(Pi) in real time, and in real time by pressure of inspiration(Pi) lower limit set value
Mathematic interpolation is carried out between pressure of inspiration(Pi) measured value, then according to mathematical modeling f2(x2), calculate what compressor was unloaded
Real-time time interval.
Now, in addition it is also necessary to the maximum discharge time interval of setting（T2max）With minimum discharge time interval（T2 min）.
When according to mathematical modeling f2(x2) time interval calculated when being more than maximum discharge time interval, that is, works as y2＞
T2maxWhen, y2=T2max；
When according to mathematical modeling f2(x2) time interval calculated is less than or equal to maximum discharge time interval, and be more than
During equal to minimum discharge time interval, by pressure of inspiration(Pi) lower limit set value and the difference of the pressure of inspiration(Pi) force value measured in real time, according to
Mathematical modeling f2(x2) calculated, that is, work as T2 min≤y2≤T2maxWhen, y2=f2(x)；
When according to mathematical modeling f2(x2) time interval calculated when being less than minimum discharge time interval, that is, works as y2＜
T2maxWhen, y2=T2min；
The explanation exemplified by setting up linear function：
Upper pressure limit is set as 1.5bara, pressure of inspiration(Pi) lower limit is 1.2bara；It is default when pressure of inspiration(Pi) lower limit and real-time
When the difference for measuring pressure of inspiration(Pi) is 0.2bara, discharge time is at intervals of 30s；It is default to work as pressure of inspiration(Pi) lower limit and in real time measurement
When the difference of pressure of inspiration(Pi) is 0.1bara, discharge time obtains two points, point 1 at intervals of 120s（0.2,30）, point 2
（0.1,120）Linear function can be set up：y2=﹣ 900x2+210。
Maximum discharge time interval T is preset again1max=180s；Minimum load time interval T1 min=15s；It can obtain complete as follows
Whole function：
Work as y2During ＜ 15, y2=15
As 15≤y2When≤180, y2=﹣ 900x2+210
Work as y2During ＞ 180, y2=180
PLC uninstalling timers are according to discharge time interval y2Timing is carried out, when timer value is equal to discharge time interval
When, C3 is unloaded, timer carries out timing again after resetting, when timer value is equal to discharge time interval, unloads C2, similarly unload
Carry C3（Compressor C3 run times are most long, and compressor C2 takes second place, and compressor C1 is most short）.
The foundation of compressor energy adjustment mathematical modeling
In order that the trend comparison of the pressure of inspiration(Pi) of measurement is stable, moving average filter is employed in the foundation of the mathematical modeling
The algorithm of ripple.Its method is that continuous N number of sampled value is regarded as a queue, and the regular length of queue is N, and one is sampled every time
New data is put into tail of the queue, and throws away a data of original head of the queue（First in first out）, N number of data in queue are calculated
Art average calculating operation, so that it may obtain new filter result.
Set up discrete models y3=f(x3), x3=pulse per second (PPS) numerical value, y3The pressure of inspiration(Pi) force value of=measurement.PLC adds in system
Start after electricity, time sequential pulse was produced every 5 seconds., can in the rising edge of each time sequential pulse according to the algorithm of moving average filter
To trigger two moving average filter values：
Compare a and b value, if it find that a ＞ b, then illustrate that pressure of inspiration(Pi) has a declining tendency, this when can use
The distinctive energy adjustment function of helical-lobe compressor is adjusted, and the compressor of long operational time is unloaded to 75% by 100% energy level
Can level work.
Compare a and b value, if it find that a ＜ b, then illustrate that pressure of inspiration(Pi) has the trend of rising, the short pressure of run time
Contracting machine is loaded into 100% by 75% energy level can level work.
Using algorithm above, the distinctive energy adjustment function of helical-lobe compressor can be used, measurement pressure of inspiration(Pi) is being set
When within the scope of fixed, the variation tendency of pressure of inspiration(Pi) is measured according to it, is finely adjusted, it is to avoid compressor is frequently started.
Claims (2)
1. a kind of Parallel sets energy-saving run regulating system, including refrigeration unit, refrigeration unit successively with condenser, choke valve,
Evaporator is connected, and evaporator is connected by aspirating air pipe with refrigeration unit, and evaporator is arranged in freezer, refrigeration unit and PLC
It is connected, PLC is connected with touch-screen, it is characterised in that：Inspiratory pressure sensor is set on aspirating air pipe, inspiratory pressure sensor with
PLC is connected；
The freezer is the multichannel freezer that is connected in parallel；
The control method of the Parallel sets energy-saving run regulating system, it comprises the following steps：
（1）As needed under pressure of inspiration(Pi) setting value, the pressure of inspiration(Pi) setting value upper limit and the pressure of inspiration(Pi) setting value of setting unit
Limit；
（2）Pass through the pressure of inspiration(Pi) measured value of PLC control system the real time measure unit；
（3）Difference x calculating will be carried out between pressure of inspiration(Pi) measured value and pressure of inspiration(Pi) setting value in real time, according to mathematical modeling f
(x) the real-time time interval y of compressor progress plus unloading, is calculated, and determines that actually compressor carries out adding the real-time of unloading
Time interval；Difference x will be carried out between pressure of inspiration(Pi) measured value and the pressure of inspiration(Pi) setting value upper limit in real time1Calculate, according to mathematics
Model f1(x1), calculate the real-time time interval y that compressor is loaded1；In real time by pressure of inspiration(Pi) setting value lower limit and pressure of inspiration(Pi)
Difference x2 calculating is carried out between power measured value, according to mathematical modeling f2 (x2), between the real-time time that calculating compressor is unloaded
Every y2；Also need to setting maximum load time interval T1max, minimum load time interval T1min, maximum discharge time interval T2max
With minimum discharge time interval T2min, the real-time time interval y loaded when the compressor calculated1During more than maximum load
Between be spaced T1maxWhen, the real-time time that compressor is loaded is at intervals of maximum load time interval T1max；When the compression calculated
The real-time time interval y that machine is loaded1Less than or equal to maximum load time interval T1max, and more than or equal to the minimum load time
It is spaced T1minWhen, the real-time time that compressor is loaded is at intervals of f1(x1)；When the compressor calculated loaded it is real-time
Time interval y1Less than minimum load time interval T1minWhen, the real-time time that compressor is loaded is at intervals of T1min；Work as calculating
The real-time time interval y that the compressor gone out is unloaded2More than maximum discharge time interval T2maxWhen, what compressor was unloaded
Real-time time is at intervals of maximum discharge time interval T2max；The real-time time interval y unloaded when the compressor calculated2It is small
In equal to maximum discharge time interval T2max, and more than or equal to minimum discharge time interval T2minWhen, the reality that compressor is unloaded
When the time at intervals of f2(x2)；The real-time time interval y unloaded when the compressor calculated2Less than between minimum discharge time
Every T2minWhen, the real-time time that compressor is unloaded is at intervals of T2min；
（4）The real-time time interval for being carried out plus being unloaded according to actually compressor, real-time plus unloading is carried out to compressor.
2. Parallel sets energy-saving run regulating system according to claim 1, it is characterised in that：Step（4）In, according to reality
The real-time time interval that compressor is carried out plus unloaded on border, real-time plus unloading is carried out to compressor according to run time is on duty by turns.
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| CN105467843A (en) * | 2015-12-28 | 2016-04-06 | 广东芬尼克兹节能设备有限公司 | Automatic cycle startup and shutdown control method and device |
| CN106288598B (en) * | 2016-08-09 | 2018-12-25 | 开封市盛晶仓储服务有限公司 | Freezer refrigerating automatic control system and method based on distributed photovoltaic power generation |
| CN107328125A (en) * | 2017-07-07 | 2017-11-07 | 泰州职业技术学院 | A kind of helical-lobe compressor refrigeration control system and its method |
| CN110631283B (en) * | 2019-10-08 | 2021-04-09 | 广东纽恩泰新能源科技发展有限公司 | Loading and unloading control method for heat pump multi-machine parallel system |
| CN114322444B (en) * | 2021-12-22 | 2022-11-11 | 珠海格力电器股份有限公司 | Refrigerating unit and loading and unloading control method thereof |
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| JP4435529B2 (en) * | 2003-10-02 | 2010-03-17 | ホシザキ電機株式会社 | Storage |
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| CN201382624Y (en) * | 2009-01-23 | 2010-01-13 | 马兴国 | Unit-combination type parallel refrigerating machine unit |
| CN201964703U (en) * | 2010-11-24 | 2011-09-07 | 珠海格力电器股份有限公司 | Energy regulator for refrigerating machine set and refrigerating system |
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| CN105020951A (en) | 2015-11-04 |
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