CN106595158A - Low-pressure control method, system and air conditioner for unit refrigeration system - Google Patents
Low-pressure control method, system and air conditioner for unit refrigeration system Download PDFInfo
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- CN106595158A CN106595158A CN201611197662.8A CN201611197662A CN106595158A CN 106595158 A CN106595158 A CN 106595158A CN 201611197662 A CN201611197662 A CN 201611197662A CN 106595158 A CN106595158 A CN 106595158A
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- Prior art keywords
- pressure
- inspiration
- force value
- bypass valve
- threshold value
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/01—Timing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2501—Bypass valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1933—Suction pressures
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention relates to a low-pressure control method, system and air conditioner for a unit refrigeration system. The method includes the steps that air suction pressure values in a loop pipeline of the unit refrigeration system are collected in real time; a bypass valve is controlled to be opened when the duration time during which the air suction pressure values are smaller than a preset bypass valve opening threshold value is longer than the preset time; and the bypass valve is controlled to be closed or remain opened according to the suction pressure values, and therefore the suction pressure values in the loop pipeline are kept in a set low-pressure range. According to the low-pressure control method, system and air conditioner for the unit refrigeration system, the states of the bypass valve at different stages are controlled through the air suction pressure values in the loop pipeline of the refrigeration system, and therefore the suction pressure values in the loop pipeline are controlled to be kept in a set low-pressure range, the air suction pressure of a unit is kept stable, and normal and reliable operation of the unit is ensured.
Description
Technical field
The present invention relates to refrigeration technology field, more particularly to a kind of Crew Cooling System low voltage control method, system and sky
Adjust.
Background technology
At present air-conditioning technical controls the shape of high-low pressure bypass valve for the reliability service of low-temperature heating by logic circuit
State, to reach effective control low-pressure lateral pressure balance.But, different air pressure and gas cannot be directed to by logic circuit control
The situation of change of pressure is precisely controlled the state of compressor and high-low pressure bypass valve, low-pressure lateral pressure fluctuation, high-low pressure easily occurs
Pressure ratio exceeds compressor operating scope, and the situation of compressor overload operation can also cause in addition compressor air suction mass flow
On the low side, poor inspiration, oil return be not smooth and the low problem of oil level, makes compressor lubrication bad, substantially reduces the use longevity of compressor
Life, greatly reduces the stability of unit low pressure operation, and the reliability of compressor operating, shortens the use longevity of unit
Life.
The content of the invention
The technical problem to be solved is for above-mentioned the deficiencies in the prior art, there is provided a kind of Crew Cooling System
Low voltage control method, system and air-conditioning, the pressure of inspiration(Pi) for maintaining unit is stablized, and meets the demand that unit normally, reliably runs.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：
According to one aspect of the present invention, there is provided a kind of Crew Cooling System low voltage control method, comprise the steps：
Step 1：The pressure of inspiration(Pi) force value of Real-time Collection Crew Cooling System return low-pressure side；
Step 2：When the pressure of inspiration(Pi) force value is less than default bypass valve unlatching threshold value and the persistent period is more than Preset Time,
Control bypass valve is opened；
Step 3：The bypass valve is controlled according to the pressure of inspiration(Pi) force value and closes or maintain unlatching so that the return
Interior pressure of inspiration(Pi) force value is maintained in the low pressure range of setting.
A kind of Crew Cooling System low voltage control method of the present invention, by the pressure of inspiration(Pi) in refrigeration system circuit pipeline
The state of bypass valve described in value control different phase, so as to the pressure of inspiration(Pi) force value controlled in the return is maintained at setting
In low pressure range, the pressure of inspiration(Pi) for maintaining unit is stablized, it is ensured that unit is normal, reliable operation.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement：
Further：The step 3 comprises the steps：
Step 31：Judge the variation tendency of the pressure of inspiration(Pi) force value, and step is entered when the pressure of inspiration(Pi) force value rises
32；
Step 32：When judging whether the pressure of inspiration(Pi) force value closes threshold value more than default bypass valve, if it is, control institute
State bypass valve closing；Otherwise, control the bypass valve and maintain opening.
The beneficial effect of above-mentioned further scheme is：Can judge the air-breathing after bypass valve is opened by above-mentioned steps
The variation tendency of pressure value, shows to cause the air-breathing in pipeline by the unlatching of bypass valve when the pressure of inspiration(Pi) force value rises
Pressure value is close towards the low pressure range of setting, and controls bypass valve when pressure of inspiration(Pi) force value closes threshold value more than default bypass valve
Close, it is achieved thereby that the pressure of inspiration(Pi) force value in return is constant in the range of setting.
Further：In the step 31, when the pressure of inspiration(Pi) force value declines, also comprise the steps：
Step 311：Whether the pressure of inspiration(Pi) force value is judged less than default limit for tonnage air pressure threshold value, if it is, control compression
Machine enters limit for tonnage pattern, execution step 312；Otherwise, into step 32；
Step 312：Judge whether the pressure of inspiration(Pi) force value moves back limit for tonnage air pressure threshold value more than default, if it is, control institute
State compressor and exit limit for tonnage pattern, and into step 32, otherwise, return to step 311.
The beneficial effect of above-mentioned further scheme is：Can be after the bypass valve be opened by above-mentioned steps, the suction
When air pressure force value is further reduced to default limit for tonnage air pressure threshold value, controls the compressor and enter limit for tonnage pattern, so can limit
Compressor processed further increases load, and compressor on the one hand can be avoided in overload operation state, and compressor is effectively entered
Row protection, on the other hand, can promote pressure of inspiration(Pi) force value to rise to as early as possible in the low pressure range of setting, shorten response time.
Further：In the step 311, when the pressure of inspiration(Pi) force value is less than default limit for tonnage air pressure threshold value, also include as
Lower step：
Step 3111：Whether the pressure of inspiration(Pi) force value is judged less than unloading air pressure threshold value, if it is, controlling the compression
Machine enters unloading mode, execution step 3112；Otherwise enter step 312；
Step 3112：Judge whether the pressure of inspiration(Pi) force value moves back unloading air pressure threshold value more than default, if it is, control institute
State compressor entrance and move back unloading mode, and into step 312；Otherwise, return to step 3111.
The beneficial effect of above-mentioned further scheme is：Pass-through mode can be after compressor enters limit for tonnage schema, institute
When stating pressure of inspiration(Pi) force value and being further reduced to default unloading air pressure threshold value, control the compressor and enter unloading mode, so subtract
The load of light compressor, the pressure of inspiration(Pi) force value in speed-up loop pipeline is gone up as early as possible, on the one hand can avoid compressor in super
Load operating region, effectively protects to compressor, on the other hand, pressure of inspiration(Pi) force value can be promoted to rise to pre- limiting as early as possible
In carrier gas pressure threshold range, then further go up to the low pressure range of setting, shorten response time.
Further：When the pressure of inspiration(Pi) force value opens threshold value, or the pressure of inspiration(Pi) more than or equal to the default bypass valve
When force value is less than or equal to Preset Time more than or equal to the persistent period that the default bypass valve opens threshold value, the bypass valve is controlled
Remain turned-off, return to step 1.
The beneficial effect of above-mentioned further scheme is：By the way, bypass can be not reaching in pressure of inspiration(Pi) force value
Valve opens threshold value, or the persistent period of pressure of inspiration(Pi) force value is when being not reaching to Preset Time, maintains the bypass valve to close, favorably
Pressure of inspiration(Pi) force value in return is constant in the low pressure range of setting.
It is according to one aspect of the present invention, there is provided a kind of Crew Cooling System low voltage control system including compressor, cold
Condenser, choke valve and vaporizer, the compressor, condenser, choke valve and vaporizer are sequentially connected and formed back by pipeline
Road, it is characterised in that：Also include bypass valve, inspiratory pressure sensor and controller.
The inspiratory pressure sensor is arranged on the pipeline in the loop and is located at the low-pressure side of the compressor, is used for
Gather the pressure of inspiration(Pi) force value of the return inner compressor low-pressure side；The bypass valve be arranged on the compressor two ends it
Between by-pass line on, and for opening or closing the by-pass line；The controller respectively with the bypass valve and air-breathing
Pressure transducer is electrically connected, and when the pressure of inspiration(Pi) force value is more than default less than the persistent period that default bypass valve opens threshold value
Between when, control bypass valve is opened, and is controlled the bypass valve according to the pressure of inspiration(Pi) force value and closed or maintain to open so that institute
The pressure of inspiration(Pi) force value stated in return is maintained in the low pressure range of setting.
A kind of Crew Cooling System low voltage control system of the present invention, by inspiratory pressure sensor Real-time Collection loop pipe
Atmospheric pressure value in road, the state of controller bypass valve according to pressure of inspiration(Pi) force value controls different phase, so as to control described returning
Pressure of inspiration(Pi) force value in the pipeline of road is maintained in the low pressure range of setting, and the pressure of inspiration(Pi) for maintaining unit is stablized, it is ensured that unit is just
Often, reliable operation.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement：
Further：The controller is additionally operable to judge the pressure of inspiration(Pi) value changes of the return inner compressor low-pressure side
Trend, and judge whether the pressure of inspiration(Pi) force value closes threshold value more than default bypass valve when the pressure of inspiration(Pi) force value rises, such as
Fruit is then to control the bypass valve by the bypass valve control unit, VCU and close；Otherwise, control the bypass valve to maintain to open shape
State.
The beneficial effect of above-mentioned further scheme is：By the way can controller control bypass valve open after,
Show to cause the pressure of inspiration(Pi) force value in pipeline towards setting by the unlatching of bypass valve when the pressure of inspiration(Pi) force value rises
Low pressure range is close, and control bypass valve is closed when pressure of inspiration(Pi) force value closes threshold value more than default bypass valve, it is achieved thereby that
Pressure of inspiration(Pi) force value in return is constant in the range of setting.
Further：The controller is additionally operable to when the pressure of inspiration(Pi) force value declines, and whether judges the pressure of inspiration(Pi) force value
Less than default limit for tonnage air pressure threshold value, if it is, controlling compressor by the limit for tonnage control unit enters limit for tonnage pattern, go forward side by side
One step judges whether the pressure of inspiration(Pi) force value moves back limit for tonnage air pressure threshold value more than default, if it is, control the compressor exiting
Limit for tonnage pattern.
The beneficial effect of above-mentioned further scheme is：By the way the bypass valve can be controlled in controller to open
Afterwards, when the pressure of inspiration(Pi) force value is further reduced to default limit for tonnage air pressure threshold value, controls the compressor and enter limit for tonnage pattern, this
Sample can limit compressor further increases load, compressor on the one hand can be avoided in overload operation state, to compression
Machine is effectively protected, and on the other hand, pressure of inspiration(Pi) force value can be promoted to rise to as early as possible in the low pressure range of setting, shortens response
Time.
Further：The controller is additionally operable to when the pressure of inspiration(Pi) force value is less than default limit for tonnage air pressure threshold value, judges institute
Pressure of inspiration(Pi) force value is stated whether less than unloading air pressure threshold value, if it is, controlling the compressor enters unloading mode, is further sentenced
Whether the pressure of inspiration(Pi) force value of breaking moves back unloading air pressure threshold value more than default, if it is, controlling the compressor and entering unloading is moved back
Pattern.
The beneficial effect of above-mentioned further scheme is：By the way after compressor enters limit for tonnage schema, institute
When stating pressure of inspiration(Pi) force value and being further reduced to default unloading air pressure threshold value, control the compressor and enter unloading mode, so subtract
The load of light compressor, it is to avoid the pressure of inspiration(Pi) force value in return further reduces, the pressure of inspiration(Pi) in speed-up loop pipeline
Value is gone up as early as possible, and compressor on the one hand can be avoided in overload operation state, compressor is effectively protected, the opposing party
Face, can promote pressure of inspiration(Pi) force value to rise to as early as possible in the range of default limit for tonnage air pressure threshold value, then further go up to setting
In low pressure range, shorten response time.
Further：When the pressure of inspiration(Pi) force value opens threshold value, or the pressure of inspiration(Pi) more than or equal to the default bypass valve
When force value is less than or equal to Preset Time more than or equal to the persistent period that the default bypass valve opens threshold value, the controller control
The bypass valve is remained turned-off.
The beneficial effect of above-mentioned further scheme is：The inspiratory pressure sensor is coordinated by the controller, can be with
Bypass valve is not reaching in pressure of inspiration(Pi) force value open threshold value, or the persistent period of pressure of inspiration(Pi) force value is not reaching to Preset Time
When, maintain the bypass valve to close, be conducive to the pressure of inspiration(Pi) force value in return constant in the low pressure range of setting.
According to one aspect of the present invention, there is provided a kind of air-conditioning, it adopts described Crew Cooling System low voltage control
System.
Description of the drawings
Fig. 1 is a kind of Crew Cooling System low voltage control method schematic flow sheet of the present invention；
Fig. 2 is a kind of Crew Cooling System low voltage control system structural representation.
In accompanying drawing, the list of parts representated by each label is as follows：
1st, compressor, 2, condenser, 3, choke valve, 4, vaporizer, 5 bypass valves, 6, inspiratory pressure sensor, 7, control
Device.
Specific embodiment
The principle and feature of the present invention are described below in conjunction with accompanying drawing, example is served only for explaining the present invention, and
It is non-for limiting the scope of the present invention.
Embodiment one, a kind of Crew Cooling System low voltage control method.Below in conjunction with a kind of units of the Fig. 1 to the present invention
Refrigeration system low voltage control method is introduced in detail.
As shown in figure 1, a kind of Crew Cooling System low voltage control method, comprises the steps：
Step 1：The pressure of inspiration(Pi) force value of low-pressure side in Real-time Collection Crew Cooling System return；
Step 2：When the pressure of inspiration(Pi) force value is less than default bypass valve unlatching threshold value and the persistent period is more than Preset Time
Control bypass valve is opened；
Step 3：The bypass valve is controlled according to the pressure of inspiration(Pi) force value and closes or maintain unlatching so that the return
Interior pressure of inspiration(Pi) force value is maintained in the low pressure range of setting.
The Crew Cooling System low voltage control method of above-described embodiment, by the pressure of inspiration(Pi) in refrigeration system circuit pipeline
The state of bypass valve described in value control different phase, so as to the pressure of inspiration(Pi) force value controlled in the return is maintained at setting
In low pressure range, the pressure of inspiration(Pi) for maintaining unit is stablized, it is ensured that unit is normal, reliable operation.
In the present embodiment, the step 3 comprises the steps：
Step 31：Judge the variation tendency of the pressure of inspiration(Pi) force value, and step is entered when the pressure of inspiration(Pi) force value rises
32；
Step 32：When judging whether the pressure of inspiration(Pi) force value closes threshold value more than default bypass valve, if it is, control institute
State bypass valve closing；Otherwise, control the bypass valve and maintain opening.
The variation tendency of the pressure of inspiration(Pi) force value can be judged after bypass valve is opened by above-mentioned steps, when the air-breathing
Pressure value shows opening so that the pressure of inspiration(Pi) force value in pipeline is leaned on towards the low pressure range of setting by bypass valve when rising
Closely, and control bypass valve when pressure of inspiration(Pi) force value closes threshold value more than default bypass valve to close, it is achieved thereby that in return
Pressure of inspiration(Pi) force value it is constant in the range of setting.
Preferably, in the step 31, when the pressure of inspiration(Pi) force value declines, also comprise the steps：
Step 311：Whether the pressure of inspiration(Pi) force value is judged less than default limit for tonnage air pressure threshold value, if it is, control compression
Machine enters limit for tonnage pattern, execution step 312；Otherwise, into step 32；
Step 312：Judge whether the pressure of inspiration(Pi) force value moves back limit for tonnage air pressure threshold value more than default, if it is, control institute
State compressor and exit limit for tonnage pattern, and into step 32, otherwise, return to step 311.
Can be after the bypass valve to be opened by above-mentioned steps, the pressure of inspiration(Pi) force value is further reduced to default limit for tonnage
During air pressure threshold value, control the compressor and enter limit for tonnage pattern, can so limit compressor further increases load, on the one hand
Compressor can be avoided in overload operation state, compressor is effectively protected, on the other hand, pressure of inspiration(Pi) can be promoted
Force value is risen to as early as possible in the low pressure range of setting, shortens response time.
Preferably, in the step 311, when the pressure of inspiration(Pi) force value is less than default limit for tonnage air pressure threshold value, also include as
Lower step：
Step 3111：Whether the pressure of inspiration(Pi) force value is judged less than unloading air pressure threshold value, if it is, controlling the compression
Machine enters unloading mode, execution step 3112；Otherwise enter step 312；
Step 3112：Judge whether the pressure of inspiration(Pi) force value moves back unloading air pressure threshold value more than default, if it is, control institute
State compressor entrance and move back unloading mode, and into step 312；Otherwise, return to step 3111.
Pass-through mode can be after compressor enters limit for tonnage schema, and the pressure of inspiration(Pi) force value is further reduced to default
During unloading air pressure threshold value, control the compressor and enter unloading mode, so mitigate the load of compressor, in speed-up loop pipeline
Pressure of inspiration(Pi) force value go up as early as possible, compressor on the one hand can be avoided in overload operation state, compressor is effectively carried out
Protection, on the other hand, can promote pressure of inspiration(Pi) force value to rise to as early as possible in the range of default limit for tonnage air pressure threshold value, then further return
Rise in the low pressure range of setting, shorten response time.
In the present embodiment, in the step 2, when the pressure of inspiration(Pi) force value opens threshold more than or equal to the default bypass valve
It is worth, or the pressure of inspiration(Pi) force value is less than or equal to Preset Time more than or equal to the persistent period that the default bypass valve opens threshold value
When, control the bypass valve and remain turned-off, return to step 1.By the way, bypass can be not reaching in pressure of inspiration(Pi) force value
Valve opens threshold value, or the persistent period of pressure of inspiration(Pi) force value is when being not reaching to Preset Time, maintains the bypass valve to close, favorably
Pressure of inspiration(Pi) force value in return is constant in the low pressure range of setting.
In the present embodiment, the default bypass valve opens threshold value, default bypass valve and closes threshold value, default limit for tonnage air pressure threshold
Value, default move back limit for tonnage air pressure threshold value, unloading air pressure threshold value and move back unloading air pressure threshold value can be according in the return
Coolant species is adjusted.By taking R134a cold-producing mediums as an example, default bypass valve opens threshold value and takes 1.2bar, presets bypass valve and closes
Threshold value takes 1.8bar, and default limit for tonnage air pressure threshold value takes 1.0bar, and default limit for tonnage air pressure threshold value of moving back takes 1.5bar, unloads air pressure threshold value
0.7bar is taken, unloading air pressure threshold value is moved back and is taken 1.2bar.
In addition, the Preset Time can also flexibly be set according to the parameter of unit such as power and operational mode etc.
Put, such as, in the present embodiment, the Preset Time can take 10S.
Preferably, in the present embodiment, the pressure of inspiration(Pi) force value and default bypass valve are being closed into threshold value, default limit for tonnage air pressure
It is threshold value, default when moving back limit for tonnage air pressure threshold value, unloading air pressure threshold value or moving back unloading air pressure threshold value and compare, it is also possible to reference in step 2
The pressure of inspiration(Pi) force value and default bypass valve are opened when threshold value compares and sets a persistent period, can so avoid what is gathered
When fluctuation occurs in the pressure of inspiration(Pi) force value, repeatedly altofrequency is switched control bypass valve, and the control compressor is entering limit
Load pattern and exit limit for tonnage pattern, into unloading mode and exit between unloading mode repeatedly altofrequency switching, affect the side
The service life of port valve and compressor.
Embodiment two, a kind of Crew Cooling System low voltage control system.Below in conjunction with a kind of units of the Fig. 2 to the present invention
Refrigeration system low voltage control method is introduced in detail.
As shown in Fig. 2 a kind of Crew Cooling System low voltage control system, including compressor 1, condenser 2, the and of choke valve 3
Vaporizer 4, the compressor 1, condenser 2, choke valve 3 sequentially connect and are formed loop with vaporizer 4 by pipeline, also include
Bypass valve 5, inspiratory pressure sensor 6 and controller 7.
The inspiratory pressure sensor 6 is arranged on the pipeline in the loop and is located at the low-pressure side of the compressor 1, uses
In the pressure of inspiration(Pi) force value for gathering the low-pressure side of return inner compressor 1；The bypass valve 5 is arranged on the compressor 1
On by-pass line between two ends, and for opening or closing the by-pass line；The controller 7 respectively with the bypass valve
5 and inspiratory pressure sensor 6 electrically connect, and the persistent period of threshold value is opened less than default bypass valve 5 in the pressure of inspiration(Pi) force value
During more than Preset Time, control bypass valve 5 is opened；And close or tie up according to the pressure of inspiration(Pi) force value control bypass valve 5
Hold unlatching so that the pressure of inspiration(Pi) force value in the return is maintained in the low pressure range of setting.
The Crew Cooling System low voltage control system of above-described embodiment, by the Real-time Collection loop of inspiratory pressure sensor 6
Atmospheric pressure value in pipeline, the state of the bypass valve 5 according to pressure of inspiration(Pi) force value controls different phase of controller 7, so as to control
The pressure of inspiration(Pi) force value stated in return is maintained in the low pressure range of setting, and the pressure of inspiration(Pi) for maintaining unit is stablized, it is ensured that machine
Group is normal, reliable operation.
In the present embodiment, the bypass valve 5 adopts electromagnetic valve.Electromagnetic valve is easy to be used cooperatively with controller 7, and realizes side
The on or off threaded a pipe, so as to the pressure of inspiration(Pi) force value in regulating loop pipeline.Electromagnetic valve structure is simple, low cost, control
High precision, arranges flexible.
In the present embodiment, the controller 7 is additionally operable to judge the pressure of inspiration(Pi) of the return inner compressor low-pressure side
Value changes trend, and judge whether the pressure of inspiration(Pi) force value closes more than default bypass valve 5 when the pressure of inspiration(Pi) force value rises
Threshold value, if it is, control the bypass valve 5 by the control unit of the bypass valve 5 closing；Otherwise, the bypass valve 5 is controlled
Maintain opening.
After the control bypass valve 5 of controller 7 is opened, show by bypass valve 5 when the pressure of inspiration(Pi) force value rises
Open and cause the pressure of inspiration(Pi) force value in pipeline close towards the low pressure range of setting, and in pressure of inspiration(Pi) force value more than default bypass valve
Control bypass valve 5 is closed during 5 closing threshold value, it is achieved thereby that the constant scope in setting of pressure of inspiration(Pi) force value in return
It is interior.
Preferably, the controller 7 is additionally operable to when the pressure of inspiration(Pi) force value declines, and whether judges the pressure of inspiration(Pi) force value
Less than default limit for tonnage air pressure threshold value, if it is, controlling compressor 1 by the limit for tonnage control unit enters limit for tonnage pattern, and
Determine whether whether the pressure of inspiration(Pi) force value moves back limit for tonnage air pressure threshold value more than default, if it is, control the compressor 1 moving back
Go out limit for tonnage pattern.
After controller 7 controls the unlatching of the bypass valve 5, the pressure of inspiration(Pi) force value is further reduced to default limit for tonnage air pressure
During threshold value, control the compressor 1 and enter limit for tonnage pattern, can so limit compressor 1 further increases load, on the one hand may be used
To avoid compressor 1 in overload operation state, compressor 1 is effectively protected, on the other hand, pressure of inspiration(Pi) can be promoted
Force value is risen to as early as possible in the low pressure range of setting, shortens response time.
Preferably, the controller 7 is additionally operable to when the pressure of inspiration(Pi) force value is less than default limit for tonnage air pressure threshold value, judges institute
Pressure of inspiration(Pi) force value is stated whether less than unloading air pressure threshold value, if it is, controlling the compressor 1 enters unloading mode, further
Judge whether the pressure of inspiration(Pi) force value moves back unloading air pressure threshold value more than default, unload if it is, controlling the compressor 1 and entering to move back
Load pattern.
After compressor 1 enters limit for tonnage schema, the pressure of inspiration(Pi) force value is further reduced to default unloading air pressure threshold
During value, control the compressor 1 and enter unloading mode, so mitigate the load of compressor 1, it is to avoid the pressure of inspiration(Pi) in return
Force value further reduces, and the pressure of inspiration(Pi) force value in speed-up loop pipeline is gone up as early as possible, on the one hand can avoid compressor 1 in super
Load operating region, effectively protects to compressor 1, on the other hand, pressure of inspiration(Pi) force value can be promoted to rise to as early as possible default
In the range of limit for tonnage air pressure threshold value, then further go up to the low pressure range of setting, shorten response time.
When the pressure of inspiration(Pi) force value opens threshold value more than or equal to the default bypass valve, or the pressure of inspiration(Pi) force value is more than
When the persistent period for opening threshold value equal to the default bypass valve is less than or equal to Preset Time, the controller controls the bypass
Valve is remained turned-off.The inspiratory pressure sensor 6 is coordinated by the controller 7, side can be not reaching in pressure of inspiration(Pi) force value
Port valve 5 opens threshold value, or the persistent period of pressure of inspiration(Pi) force value is when being not reaching to Preset Time, maintains the bypass valve 5 to close,
Be conducive to the pressure of inspiration(Pi) force value in return constant setting low pressure range in.
In the present embodiment, the pressure of inspiration(Pi) force value and default bypass valve 5 are closed into threshold value, default limit for tonnage in the main control
It is air pressure threshold value, default when moving back limit for tonnage air pressure threshold value, unloading air pressure threshold value or moving back unloading air pressure threshold value and compare, it is also possible to controller 7
The pressure of inspiration(Pi) force value and default bypass valve 5 are opened into one persistent period of setting when threshold value compares, collection can be so avoided
Pressure of inspiration(Pi) force value when there is fluctuation, the control of the controller 7 bypass valve 5 altofrequency switch repeatedly, and control is described
Compressor 1 into limit for tonnage pattern and is exiting limit for tonnage pattern, into unloading mode and is exiting between unloading mode altofrequency repeatedly
Switching, affects the service life of the bypass valve 5 and compressor 1.
Embodiment three, a kind of air-conditioning.
A kind of air-conditioning, including described Crew Cooling System low voltage control system.
A kind of air-conditioning of the present invention, by the Crew Cooling System low voltage control system, for different in return
Pressure of inspiration(Pi) force value and the situation of change of pressure of inspiration(Pi) force value be precisely controlled the state of compressor and high-low pressure bypass valve, so as to control
Air-conditioning processed reliably runs in low-temperature heating so that in the range of the constant setting of pressure of inspiration(Pi) force value in return, together
When guarantee compressor operating in rational pattern, extend unit durability.
The foregoing is only presently preferred embodiments of the present invention, not to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (11)
1. a kind of Crew Cooling System low voltage control method, it is characterised in that comprise the steps：
Step 1：The pressure of inspiration(Pi) force value of low-pressure side in Real-time Collection Crew Cooling System return；
Step 2：When the pressure of inspiration(Pi) force value is less than default bypass valve unlatching threshold value and the persistent period is more than Preset Time, control
Bypass valve is opened；
Step 3：The bypass valve is controlled according to the pressure of inspiration(Pi) force value and closes or maintain unlatching so that in the return
Pressure of inspiration(Pi) force value is maintained in the low pressure range of setting.
2. Crew Cooling System low voltage control method according to claim 1, it is characterised in that：The step 3 include as
Lower step：
Step 31：Judge the variation tendency of the pressure of inspiration(Pi) force value, and step 32 is entered when the pressure of inspiration(Pi) force value rises；
Step 32：When judging whether the pressure of inspiration(Pi) force value closes threshold value more than default bypass valve, if it is, controlling the side
Port valve is closed；Otherwise, control the bypass valve and maintain opening.
3. Crew Cooling System low voltage control method according to claim 2, it is characterised in that：In the step 31, when
When the pressure of inspiration(Pi) force value declines, also comprise the steps：
Step 311：Whether the pressure of inspiration(Pi) force value is judged less than default limit for tonnage air pressure threshold value, if it is, control compressor enters
Enter limit for tonnage pattern, execution step 312；Otherwise, into step 32；
Step 312：Judge whether the pressure of inspiration(Pi) force value moves back limit for tonnage air pressure threshold value more than default, if it is, controlling the pressure
Contracting machine exits limit for tonnage pattern, and into step 32, otherwise, return to step 311.
4. Crew Cooling System low voltage control method according to claim 3, it is characterised in that：In the step 311, when
When the pressure of inspiration(Pi) force value is less than default limit for tonnage air pressure threshold value, also comprise the steps：
Step 3111：Whether the pressure of inspiration(Pi) force value is judged less than unloading air pressure threshold value, if it is, control the compressor entering
Enter unloading mode, execution step 3112；Otherwise enter step 312；
Step 3112：Judge whether the pressure of inspiration(Pi) force value moves back unloading air pressure threshold value more than default, if it is, controlling the pressure
Contracting machine is entered and moves back unloading mode, and into step 312；Otherwise, return to step 3111.
5. the Crew Cooling System low voltage control method according to any one of Claims 1-4, it is characterised in that：The step
In rapid 2, when the pressure of inspiration(Pi) force value opens threshold value more than or equal to the default bypass valve, or the pressure of inspiration(Pi) force value more than etc.
When the persistent period for opening threshold value in the default bypass valve is less than or equal to Preset Time, controls the bypass valve and remain turned-off,
Return to step 1.
6. a kind of Crew Cooling System low voltage control system, including compressor, condenser, choke valve and vaporizer, the compression
Machine, condenser, choke valve sequentially connect and are formed loop with vaporizer by pipeline, it is characterised in that：Also include bypass valve, inhale
Air pressure force transducer and controller；
The inspiratory pressure sensor is arranged on the pipeline in the loop and is located at the low-pressure side of the compressor, for gathering
The pressure of inspiration(Pi) force value of the return inner compressor low-pressure side；
The bypass valve is arranged on the by-pass line between the two ends of the compressor, and for opening or closing the bypass
Pipeline；
The controller is electrically connected respectively with the bypass valve and inspiratory pressure sensor, and in the pressure of inspiration(Pi) force value less than pre-
If bypass valve opens the persistent period of threshold value more than Preset Time, control bypass valve is opened；And according to the pressure of inspiration(Pi)
The value control bypass valve is closed or maintains to open so that the pressure of inspiration(Pi) force value in the return is maintained at the low pressure of setting
In the range of.
7. Crew Cooling System low voltage control system according to claim 6, it is characterised in that：The controller is additionally operable to
Judge the pressure of inspiration(Pi) value changes trend of the return inner compressor low-pressure side, and sentence when the pressure of inspiration(Pi) force value rises
Whether the pressure of inspiration(Pi) force value of breaking closes threshold value more than default bypass valve, if it is, by bypass valve control unit, VCU control
Make the bypass valve to close；Otherwise, control the bypass valve and maintain opening.
8. Crew Cooling System low voltage control system according to claim 7, it is characterised in that：The controller is additionally operable to
When the pressure of inspiration(Pi) force value declines, whether the pressure of inspiration(Pi) force value is judged less than default limit for tonnage air pressure threshold value, if it is, logical
Cross the limit for tonnage control unit control compressor and enter limit for tonnage pattern, and determine whether the pressure of inspiration(Pi) force value whether more than pre-
If moving back limit for tonnage air pressure threshold value, if it is, controlling the compressor exits limit for tonnage pattern.
9. Crew Cooling System low voltage control system according to claim 8, it is characterised in that：The controller is additionally operable to
When the pressure of inspiration(Pi) force value is less than default limit for tonnage air pressure threshold value, judge the pressure of inspiration(Pi) force value whether less than unloading air pressure threshold
Value, if it is, controlling the compressor enters unloading mode, determines whether whether the pressure of inspiration(Pi) force value moves back more than default
Unloading air pressure threshold value, if it is, controlling the compressor and entering unloading mode is moved back.
10. the Crew Cooling System low voltage control system according to any one of claim 6 to 9, it is characterised in that：When described
Pressure of inspiration(Pi) force value opens threshold value more than or equal to the default bypass valve, or the pressure of inspiration(Pi) force value is more than or equal to the default side
When port valve opens the persistent period of threshold value less than or equal to Preset Time, the controller controls the bypass valve and remains turned-off.
11. a kind of air-conditionings, it is characterised in that including the Crew Cooling System low voltage control system described in any one of claim 6-10
System.
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| CN201611197662.8A CN106595158A (en) | 2016-12-22 | 2016-12-22 | Low-pressure control method, system and air conditioner for unit refrigeration system |
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| CN201611197662.8A CN106595158A (en) | 2016-12-22 | 2016-12-22 | Low-pressure control method, system and air conditioner for unit refrigeration system |
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| CN115823759A (en) * | 2022-11-25 | 2023-03-21 | 珠海格力电器股份有限公司 | Compression refrigeration system and control method |
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