CN105987549A - Control method and control device for automatic addition of antifreezing solution - Google Patents
Control method and control device for automatic addition of antifreezing solution Download PDFInfo
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- CN105987549A CN105987549A CN201510058237.XA CN201510058237A CN105987549A CN 105987549 A CN105987549 A CN 105987549A CN 201510058237 A CN201510058237 A CN 201510058237A CN 105987549 A CN105987549 A CN 105987549A
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Abstract
The invention discloses a control method and a control device for automatic addition of antifreezing solution. The control method comprises the following steps: judging whether cooling water on the surface of a heat exchanger in refrigeration equipment is frozen or not; when a controller detects that the cooling water is in a frozen state, controlling an addition pump to be started, extracting antifreezing solution from a concentrated antifreezing solution vessel by the addition pump, and conveying the antifreezing solution to the refrigeration equipment; and when the controller detects that addition of the antifreezing solution is completed, controlling the addition pump to be closed, and finishing operation. The antifreezing solution adding method provided by the invention is not only applicable to automatic addition of the antifreezing solution for the cooling water of a water-cooling heat pump air conditioner and an evaporation cooling type heat pump air conditioner, but also can guarantee that addition amount of the antifreezing solution accords with the real-time operation condition requirement of a heat pump system, guarantees normal operation of an air conditioner system under low ambient temperature working condition and is simple in process, high in accuracy and low in cost.
Description
Technical field
The present invention relates to field of refrigeration, particularly relate to the controlling party of a kind of automatic interpolation anti-freezing solution
Method and control device.
Background technology
In the winter time for preventing the cooling water freezing in water cooling heat pump air-conditioning or transpiration-cooled heat pump air conditioner from needing
Anti-icing fluid to be added, existing anti-icing fluid addition manner is, according to the concentration value containing anti-icing fluid in water
Corresponding freezing point value, in the use Laboratory Instruments such as measuring cup, graduated cylinder detection water after the concentration value of anti-icing fluid
The most manually add anti-icing fluid, but, the method uses pure manual operations, operation complexity, uses
Inconvenience, error is relatively big, high cost.
Summary of the invention
For solving above-mentioned technical problem, the invention discloses the controlling party of a kind of automatic interpolation anti-freezing solution
Method, it comprises the steps:
Judge whether the cooling water of the heat exchanger surface in refrigeration plant freezes；
When controller detects that heat exchanger surface is in icing condition, control to add pump startup, add
Pump extracts anti-icing fluid in dense anti-icing fluid vessel, to refrigeration plant conveying antifreezing fluid；
When controller detects that interpolation anti-icing fluid completes, control described interpolation pump and close, terminate operation；
Further, in above-mentioned steps, it is judged that whether the cooling water of described heat exchanger surface freezes
Method includes one or more method the use of following method,
By monitoring the cold-producing medium in cooler-water temperature and the heat exchanger of described refrigeration plant or refrigerating medium
Respective temperature or the relation between them or variation relation judge, or,
By the relation between cooler-water temperature and the evaporating pressure of described monitoring control devices refrigeration plant or
Variation relation judges, or,
By the cooler-water temperature of described monitoring control devices refrigeration plant, evaporating pressure, condensing pressure it
Between relation or variation relation judge, or,
By the cooler-water temperature of described monitoring control devices refrigeration plant, evaporating pressure or use side (i.e.
Hot water for during heating operation) relation between Inlet and outlet water temperature or variation relation judge, or
By the cooler-water temperature of described monitoring control devices refrigeration plant, evaporating pressure, condensing pressure,
Relation or variation relation between compressor operating electric current judge, or,
By the cooler-water temperature of described monitoring control devices refrigeration plant, evaporating pressure or use side (i.e.
Hot water for during heating operation) between Inlet and outlet water temperature, use relation or the variation relation of side discharge
Judge.
Further, in the above-mentioned methods, by the ice sheet of monitoring refrigeration plant heat exchanger surface whether
Melt and judge whether anti-icing fluid has added.
Further, in the above-mentioned methods, it is judged that the side whether ice sheet of described heat exchanger surface melts
Method includes one or more method the use of following method,
By monitoring the cold-producing medium in cooler-water temperature and the heat exchanger of described refrigeration plant or refrigerating medium
Respective temperature or the relation between them or variation relation judge, or,
By the relation between cooler-water temperature and the evaporating pressure of described monitoring control devices refrigeration plant or
Variation relation judges, or,
By the cooler-water temperature of described monitoring control devices refrigeration plant, evaporating pressure, condensing pressure it
Between relation or variation relation judge, or,
By the cooler-water temperature of described monitoring control devices refrigeration plant, evaporating pressure or use side (system
Hot water when heat is run) relation between Inlet and outlet water temperature or variation relation judge, or
By the cooler-water temperature of described monitoring control devices refrigeration plant, evaporating pressure, condensing pressure,
Relation or variation relation between compressor operating electric current judge, or,
By the cooler-water temperature of described monitoring control devices refrigeration plant, evaporating pressure or use side (system
Hot water when heat is run) between Inlet and outlet water temperature, use the relation of side discharge or variation relation
Judge.
Further, in the above-mentioned methods, at the ice sheet of the heat exchanger surface by monitoring refrigeration plant
Before whether melting, one of also comprise the steps or partly or entirely:
Judge to add whether pump completes to start；
Judge whether the anti-icing fluid in dense antifreeze vessel is finished；
Judge whether refrigeration plant water tank has spilling water.
Further, in the above-mentioned methods, it is judged that add pump whether complete to start or anti-icing fluid whether
The method being finished is:
Pump inlet and outlet pressure is added in monitoring, or whether the pressure differential imported and exported reaches setting value, when reaching
During setting value, it is believed that interpolation pump has been started up or anti-icing fluid has been used up.
Further, in the above-mentioned methods, it is judged that add pump whether complete to start or anti-icing fluid whether
The method being finished is:
Monitoring is added pump and is imported and exported liquid flowing state, judges by arranging flow switch in import and export
The flow regime of liquid, judges whether interpolation pump has been started up or whether anti-icing fluid has been used up then.
Further, in the above-mentioned methods, it is judged that whether refrigeration plant water tank has spilling water to be by water
Case surface configuration water-level gauge draws.
Further, in the above-mentioned methods, control the method that described anti-icing fluid added to include: set
Surely adding the time of anti-icing fluid, when reaching to set time value, controller controls to stop adding anti-icing fluid,
It is considered as anti-icing fluid to have added.
Further, in the above-mentioned methods, the cooler-water temperature of monitoring refrigeration plant can use ambient side
Inlet temperature directly or indirectly substitutes；Or evaporator pressure can be with suction pressure of compressor or evaporation
Device inlet pressure or evaporator outlet temperature directly or indirectly substitute；Or condensing pressure can be with condensation
Device outlet pressure or oil pressure or condensation temperature or pressure at expulsion directly or indirectly substitute.
Based on another aspect of the present invention, also provide for the above-mentioned control method of a kind of use and automatically add
The control device of anti-freezing solution, comprising: the dense anti-icing fluid vessel being connected by pipeline, add pump
And refrigeration plant, described refrigeration plant is provided with a controller, when controller detects refrigeration plant
Heat exchanger surface when being in icing condition, control to add pump startup, add pump from dense anti-icing fluid vessel
Interior extraction anti-icing fluid, to refrigeration plant conveying antifreezing fluid；When controller detects that interpolation anti-icing fluid completes
Time, control described interpolation pump and close, terminate operation；Wherein, it is judged that the cooling of described heat exchanger surface
The method whether water freezes includes one or more method of following method and uses:
By monitoring the cold-producing medium in cooler-water temperature and the heat exchanger of described refrigeration plant or refrigerating medium
Respective temperature or the relation between them or variation relation judge, or,
Closed by the relation between cooler-water temperature and the evaporating pressure of the described refrigeration plant of monitoring or change
System judges, or,
By monitoring pass between the cooler-water temperature of described refrigeration plant, evaporating pressure, condensing pressure
System or variation relation judge, or,
(it is system by the monitoring cooler-water temperature of described refrigeration plant, evaporating pressure or use side
Hot water when heat is run) relation between Inlet and outlet water temperature or variation relation judge, or
By the monitoring cooler-water temperature of described refrigeration plant, evaporating pressure, condensing pressure, compressor
Relation or variation relation between running current judge, or,
(it is system by the monitoring cooler-water temperature of described refrigeration plant, evaporating pressure or use side
Hot water when heat is run) between Inlet and outlet water temperature, use the relation of side discharge or variation relation to sentence
Disconnected.
Compared with prior art, the control method of automatic interpolation anti-freezing solution provided by the present invention, no
It is only applicable to water cooling heat pump air-conditioning and the automatic interpolation of transpiration-cooled heat pump air conditioner cooling water anti-icing fluid,
Can also ensure that the addition of anti-icing fluid meets the operating condition requirement of real-time heat pump, it is ensured that low
During ring temperature operating mode, air conditioning system is properly functioning, and process is simple, accuracy is high, low cost.
Accompanying drawing explanation
Fig. 1 is that the control method using automatic interpolation anti-freezing solution of the present invention is added antifreeze
The connection diagram controlling device of liquid；
Fig. 2 is the fundamental diagram of the control method of automatic interpolation anti-freezing solution of the present invention.
Detailed description of the invention
With specific embodiment, the present invention is described in further details below in conjunction with the accompanying drawings.
Referring to the drawings 1, Fig. 1 is the control using a kind of automatic interpolation anti-freezing solution of the present invention
Method is automatically added the principle schematic controlling device of anti-icing fluid, this control method and device and is fitted
Cooling water anti-icing fluid interpolations automatically in water cooling heat pump air-conditioning or transpiration-cooled heat pump air conditioner etc. are made
Cooling system or cooling water system field, this control device include dense anti-icing fluid vessel 1, add pump 2 with
And refrigeration plant 3, described refrigeration plant 3 can be transpiration-cooled water chiller-heater unit or vaporation-type cold
Condenser or closed cooling tower or heat source tower or water chiller combined heat source tower or air conditioner integrated unit,
Refrigeration plant 3 includes a controller, between anti-icing fluid vessel 1 and interpolation pump 2, and adds pump 2
It is connected by pipeline with between refrigeration plant 3, adds pump 2 and instructed by refrigeration plant, start or close
Close, control the anti-icing fluid in anti-icing fluid vessel 1 from pipeline output to refrigeration plant.Vaporizer and cold
Condenser belongs to strong phase-change heat-exchange process, i.e. boiling heat transfer and condensing heat-exchange.Refrigeration plant is in the winter time
In heating operations, heat exchanger surface moisture film does not add antifreezing agent under compared with low ambient temperature or antifreezing agent is dense
Typically can freeze when spending inadequate, controller real-time heat exchanger 4 surface ice condition is monitored, when
When heat exchanger 4 surface moisture film in evaporative condenser or closed cooling tower freezes, controller can be added
Adding pump 2 and send the instruction adding anti-icing fluid, the described i.e. electrifying startup of interpolation pump 2, by dense anti-icing fluid device
Dense antifreeze liquid pump in ware 1 is in the water receiving case in evaporative condenser or closed cooling tower, it is achieved anti-
Freeze the automatic interpolation of liquid.The device using control method of the present invention can ensure that the addition symbol of anti-icing fluid
Close the operating condition requirement of real-time heat pump, it is ensured that the normal fortune of air conditioning system during low ring temperature operating mode
OK.
Fig. 2 shows that the work of the control method of a kind of automatic interpolation anti-freezing solution of the present invention is former
Reason figure.
This control method comprises the steps of:
Step S1: judge whether the cooling water of the heat exchanger surface in refrigeration plant freezes.
Judge whether that icing has following several method.
Method one: cooler-water temperature and the cold-producing medium in heat exchanger of refrigeration plant monitored in real time by controller
Or the variations in temperature of refrigerating medium, the cooler-water temperature obtained by detection and refrigerant temperature or refrigerating medium
Temperature and the functional relationship formed between them or fuzzy logical relationship judge the cooling of heat exchanger surface
Whether water freezes.As a example by formula Q=KA Δ T, K is heat transfer coefficient, and A is heat exchange area, Δ
T is cooling water and cold-producing medium or the temperature difference of refrigerating medium, when heat exchange amount Q mono-timing, if Δ T increases
Compared with big or bigger than preset value, then explanation has icing or as there being icing, if Q/ Δ T becomes the least,
That is there is icing or can be used as icing.Fuzzy logical relationship of the present invention, refers to not
Necessarily must judge the real relationship change of this function accurately, as long as can interpolate that out the two in principle
Change curve substantially or functional relationship.Additionally, set by described monitoring control devices refrigeration
Standby cooler-water temperature and refrigerant temperature or refrigerant temperature monitor the most simultaneously Compressor Discharge Pressure,
Evaporator exit pressure, evaporator outlet temperature, oil pressure, condensing pressure, condensation temperature, compressor
Running current, use side (being hot water during heating operation) Inlet and outlet water temperature, use side discharge
Relation or variation relation between the part or all of quantity of state of parameter judge to cool down whether water freezes..
Method two: the cooler-water temperature of refrigeration plant, evaporating pressure each state monitored in real time by controller
Amount or respective variable quantity and the relation between them or variation relation, the cooling obtained by detection
Functional relationship between water water temperature and evaporating pressure or fuzzy logical relationship judge the cooling of heat exchanger surface
Whether water freezes.In like manner, in formula Q=KA Δ T, because evaporating temperature can be stated by evaporating pressure P,
Therefore it is relevant with evaporating pressure P and cooling water temperature to be expressed as Δ T, additionally, by described control
When the change between cooler-water temperature and the evaporating pressure of refrigeration plant monitored by device, in order to more accurate
Judge whether heat exchanger surface freezes, it is also possible to be used as the means of auxiliary judgment by following method.
I.e. while the cooler-water temperature and evaporating pressure of monitoring refrigeration plant, monitoring compressor row the most simultaneously
Atmospheric pressure, evaporator outlet temperature, oil pressure, condensing pressure, condensation temperature, compressor operating electric current,
Use side Inlet and outlet water temperature, use the relation between the part or all of quantity of state of side discharge parameter or
Variation relation judges to cool down whether water freezes.
Method three: controller monitors the cooler-water temperature of refrigeration plant, evaporating pressure, condensation pressure in real time
Relation between power or variation relation, the cooler-water temperature obtained by detection and evaporating pressure, condensation
Functional relationship or fuzzy logical relationship between pressure judge whether the cooling water of heat exchanger surface freezes.
In like manner, in formula Q=KA Δ T, Δ T is relevant with evaporating pressure P and cooling water temperature is relevant, Q
Relevant with evaporating pressure and condensing pressure, the most also can monitor Compressor Discharge Pressure, evaporator outlet
Temperature, oil pressure, condensation temperature, compressor operating electric current, use side Inlet and outlet water temperature, use side water
Relation or variation relation between the part or all of quantity of state of flow parameter judge to cool down whether water is tied
Ice.
Method four: controller monitors the cooler-water temperature of refrigeration plant, evaporating pressure, use side in real time
Relation between Inlet and outlet water temperature or variation relation, the cooler-water temperature obtained by detection and vapor pres-sure
Functional relationship or fuzzy logical relationship between power, use side Inlet and outlet water temperature judge heat exchanger surface
Whether cooling water freezes.In like manner, in formula Q=KA Δ T, Δ T is relevant with evaporating pressure P and cold
But coolant-temperature gage is relevant, and Q is relevant with using side Inlet and outlet water temperature, the most also can monitor compressor air-discharging pressure
Power, evaporator outlet temperature, oil pressure, condensing pressure, condensation temperature, compressor operating electric current, make
Judge to cool down water by the relation between the part or all of quantity of state of side discharge parameter or variation relation
Whether freeze.
Method five: controller monitors the cooler-water temperature of refrigeration plant, evaporating pressure, condensation pressure in real time
Relation between power, compressor operating electric current or variation relation, the cooler-water temperature obtained by detection
And functional relationship or fuzzy logical relationship between evaporating pressure, use side Inlet and outlet water temperature judge heat exchange
Whether the cooling water on device surface freezes.In like manner, in formula Q=KA Δ T, Δ T and evaporating pressure P
About relevant with cooling water temperature, Q is current related with evaporating pressure, condensing pressure and compressor operating,
The most also can monitor Compressor Discharge Pressure, evaporator outlet temperature, oil pressure, condensation temperature, use
Side Inlet and outlet water temperature, use the relation between the part or all of quantity of state of side discharge parameter or change
Relation judges to cool down whether water freezes.
Method six: controller is monitored the cooler-water temperature of refrigeration plant, evaporating pressure in real time or uses
Between the Inlet and outlet water temperature of side, use the relation between the discharge of side or variation relation, obtained by detection
Cooler-water temperature and evaporating pressure, use side Inlet and outlet water temperature, use the function between the discharge of side
Relation or fuzzy logical relationship judge whether the cooling water of heat exchanger surface freezes.In like manner, formula Q=KA
In Δ T, Δ T is relevant with evaporating pressure P and cooling water temperature is relevant, and Q passes in and out water temperature with using side
Degree, use side discharge relevant, the most also can monitor Compressor Discharge Pressure, evaporator exit pressure,
Evaporator outlet temperature, oil pressure, condensing pressure, condensation temperature, the portion of compressor operating current parameters
Point or all relation or variation relation between quantity of state judge to cool down whether water freezes.
Step S2: when controller detects that heat exchanger surface is in icing condition, controls to add pump and opens
Dynamic, add pump and in dense anti-icing fluid vessel, extract anti-icing fluid, to refrigeration plant conveying antifreezing fluid.
Step S3: when controller detects that interpolation anti-icing fluid completes, control described interpolation pump and close,
Terminate operation.
Specifically, whether monitoring control devices anti-icing fluid has added is by judging evaporative condenser
Or whether the ice sheet of closed cooling tower heat exchanger surface has melted.
Judge whether ice sheet has melted and include following several method.
Method one: cooler-water temperature and the cold-producing medium in heat exchanger of refrigeration plant monitored in real time by controller
Or the variations in temperature of refrigerating medium, the cooler-water temperature obtained by detection and refrigerant temperature or refrigerating medium
Temperature and the functional relationship formed between them or fuzzy logical relationship judge the cooling of heat exchanger surface
Whether water freezes.As a example by formula Q=KA Δ T, K is heat transfer coefficient, and A is heat exchange area, Δ
T is cooling water and cold-producing medium or the temperature difference of refrigerating medium, when heat exchange amount Q mono-timing, if Δ T increases
Compared with big or bigger than preset value, then explanation has icing or as there being icing, if Q/ Δ T becomes the least,
That is there is icing or can be used as icing.Fuzzy logical relationship of the present invention, refers to not
Necessarily must judge the real relationship change of this function accurately, as long as can interpolate that out the two in principle
Change curve substantially or functional relationship.Additionally, set by described monitoring control devices refrigeration
Standby cooler-water temperature and refrigerant temperature or refrigerant temperature monitor the most simultaneously Compressor Discharge Pressure,
Evaporator exit pressure, evaporator outlet temperature, oil pressure, condensing pressure, condensation temperature, compressor
Running current, use side (being hot water during heating operation) Inlet and outlet water temperature, use side discharge
Relation or variation relation between the part or all of quantity of state of parameter judge to cool down whether water melts.
Method two: the cooler-water temperature of refrigeration plant, evaporating pressure each state monitored in real time by controller
Amount or respective variable quantity and the relation between them or variation relation, the cooling obtained by detection
Functional relationship between water water temperature and evaporating pressure or fuzzy logical relationship judge the cooling of heat exchanger surface
Whether water freezes.In like manner, in formula Q=KA Δ T, because evaporating temperature can be stated by evaporating pressure P,
Therefore it is relevant with evaporating pressure P and cooling water temperature to be expressed as Δ T, additionally, by described control
When the change between cooler-water temperature and the evaporating pressure of refrigeration plant monitored by device, in order to more accurate
Judge whether heat exchanger surface freezes, it is also possible to be used as the means of auxiliary judgment by following method.
I.e. while the cooler-water temperature and evaporating pressure of monitoring refrigeration plant, monitoring compressor row the most simultaneously
Atmospheric pressure, evaporator outlet temperature, oil pressure, condensing pressure, condensation temperature, compressor operating electric current,
Use side Inlet and outlet water temperature, use the relation between the part or all of quantity of state of side discharge parameter or
Variation relation judges to cool down whether water melts.
Method three: controller monitors the cooler-water temperature of refrigeration plant, evaporating pressure, condensation pressure in real time
Relation between power or variation relation, the cooler-water temperature obtained by detection and evaporating pressure, condensation
Functional relationship or fuzzy logical relationship between pressure judge whether the cooling water of heat exchanger surface freezes.
In like manner, in formula Q=KA Δ T, Δ T is relevant with evaporating pressure P and cooling water temperature is relevant, Q
Relevant with evaporating pressure and condensing pressure, the most also can monitor Compressor Discharge Pressure, evaporator outlet
Temperature, oil pressure, condensation temperature, compressor operating electric current, use side Inlet and outlet water temperature, use side water
Relation or variation relation between the part or all of quantity of state of flow parameter judge to cool down whether water melts
Change.
Method four: controller monitors the cooler-water temperature of refrigeration plant, evaporating pressure, use side in real time
Relation between Inlet and outlet water temperature or variation relation, the cooler-water temperature obtained by detection and vapor pres-sure
Functional relationship or fuzzy logical relationship between power, use side Inlet and outlet water temperature judge heat exchanger surface
Whether cooling water freezes.In like manner, in formula Q=KA Δ T, Δ T is relevant with evaporating pressure P and cold
But coolant-temperature gage is relevant, and Q is relevant with using side Inlet and outlet water temperature, the most also can monitor compressor air-discharging pressure
Power, evaporator outlet temperature, oil pressure, condensing pressure, condensation temperature, compressor operating electric current, make
Judge to cool down water by the relation between the part or all of quantity of state of side discharge parameter or variation relation
Whether melt.
Method five: controller monitors the cooler-water temperature of refrigeration plant, evaporating pressure, condensation pressure in real time
Relation between power, compressor operating electric current or variation relation, the cooler-water temperature obtained by detection
And functional relationship or fuzzy logical relationship between evaporating pressure, use side Inlet and outlet water temperature judge heat exchange
Whether the cooling water on device surface freezes.In like manner, in formula Q=KA Δ T, Δ T and evaporating pressure P
About relevant with cooling water temperature, Q is current related with evaporating pressure, condensing pressure and compressor operating,
The most also can monitor Compressor Discharge Pressure, evaporator outlet temperature, oil pressure, condensation temperature, use
Side Inlet and outlet water temperature, use the relation between the part or all of quantity of state of side discharge parameter or change
Relation judges to cool down whether water melts.
Method six: controller is monitored the cooler-water temperature of refrigeration plant, evaporating pressure in real time or uses
Between the Inlet and outlet water temperature of side, use the relation between the discharge of side or variation relation, obtained by detection
Cooler-water temperature and evaporating pressure, use side Inlet and outlet water temperature, use the function between the discharge of side
Relation or fuzzy logical relationship judge whether the cooling water of heat exchanger surface freezes.In like manner, formula Q=KA
In Δ T, Δ T is relevant with evaporating pressure P and cooling water temperature is relevant, and Q passes in and out water temperature with using side
Degree, use side discharge relevant, the most also can monitor Compressor Discharge Pressure, evaporator exit pressure,
Evaporator outlet temperature, oil pressure, condensing pressure, condensation temperature, the portion of compressor operating current parameters
Point or all relation or variation relation between quantity of state judge to cool down whether water melts.
Wherein it is desired to explanation, in the above-described embodiments, characterize Δ T can be the coldest
But coolant-temperature gage, refrigerant temperature or refrigerant temperature, it is also possible to be ambient temperature or inlet temperature, system
Refrigerant temperature or refrigerant temperature.Characterize the internal refrigeration storage agent temperature that refrigerant temperature can be detection,
It can also be the pressure dependence of one of evaporating pressure, pressure of inspiration(Pi), evaporator pressure.Characterize Q
Can be compressor operating quantity or running status or supplying hot water turnover water temperature or its discharge relation,
Or evaporating temperature and condensation temperature or compressor operating current relationship.Evaporating temperature can by evaporating pressure,
Pressure of inspiration(Pi), evaporator pressure, suction temperature etc. replace calculating；Condensation temperature can be by condensing
Pressure, pressure at expulsion, condensator outlet pressure, outlet temperature, oil pressure etc. replace calculating.KA is also
Have relevant with the situation of heat exchanger heat exchange amount, such as, the operation quantity of cooling blower or air quantity or efficiency
Relevant about, the operation quantity of cooling water pump or flow or frequency.
Further, it is also possible to set when close interpolation pump by the control time, namely it is previously set
One section, from starting to add anti-icing fluid to terminating to add time of anti-icing fluid, is arrived when the setting time, i.e. thinks
Adding procedure receives, and controller controls to cut out interpolation pump, and this method also can realize.
In order to judge whether ice sheet melts more accurately, before being judged by said method, also may be used
With by one of following step or partly or entirely go judge.
First determine whether whether described interpolation pump completes to start.Judge whether interpolation pump completes startup and can pass through
The change of the difference that pump inlet and outlet pressure is added in monitoring judges to draw, about the difference of pressure, and can be prior
Set, when the difference of the pressure of turnover reaches certain first setting value, i.e. think that interpolation pump has been started up；
Or add pump import and export fluid flow state change by monitoring to judge to draw, about flow regime
Monitoring, can judge by arranging water flow switch in import and export, be higher or lower than in discharge
Triggering output alarm signal when some set point and pass to controller, controller after obtaining signal is
Can make and indicate action accordingly, it is achieved the purpose controlled with discharge.
After interpolation pump completes to start, the constantly anti-icing fluid from dense anti-icing fluid vessel is extracted and is delivered to
In refrigeration plant.
Next, then judge whether the anti-icing fluid in described dense anti-icing fluid vessel is finished.Judge anti-icing fluid device
Whether the anti-icing fluid in ware is finished can be judged by the change of the difference that pump inlet and outlet pressure is added in monitoring
Go out, when the difference of the pressure of turnover reaches certain second setting value, i.e. think that anti-icing fluid has run out, or
Person adds pump import and export fluid flow state change by monitoring and judges to draw.Its determination methods and upper
State and judge to add whether pump completes to start essentially identical, be also the difference by monitoring pressure and water flow switch
Realize, but the change of the change of the difference of the pressure obtained and water flow switch is contrary with said process.
Finally, it is judged that whether evaporative condenser or closed cooling tower water tank have spilling water.Determine whether
Spilling water, can judge to draw by the water level in monitoring evaporative condenser or closed cooling tower water tank.
The monitoring of water level can be realized by level sensor or water level switch.
By the monitoring of above three process, then through the data monitoring whether ice sheet is melted, it is possible to
It is accurately judged to whether ice sheet melts, then provides corresponding control signal by controller.
When adding, pump cannot complete to start, anti-icing fluid in dense anti-icing fluid vessel has run out, vaporation-type
Condenser or closed cooling tower water tank have the heat exchanger in spilling water or evaporative condenser or closed cooling tower
Surface has been melted, and controller sends interpolation pump out code.Cooling water system receives stopping and adding anti-
After freezing liquid instruction, adding pump and stop adding anti-icing fluid operation, whole process terminates.Use the present invention's
Control device and automatically add anti-freezing solution to judging whether that the method freezing and whether melting is with above-mentioned
The control method stated is consistent, is not described in detail here.
Control method according to the present invention is applicable not only to water cooling heat pump air-conditioning and transpiration-cooled heat pump is empty
Adjust the automatic interpolation of cooling water anti-icing fluid, it is also ensured that the addition of anti-icing fluid meets real-time heat pump system
The operating condition requirement of system, it is ensured that during low ring temperature operating mode, air conditioning system is properly functioning, process is simple,
Accuracy is high, low cost.
It should be noted that and the foregoing is only presently preferred embodiments of the present invention, not thereby limit
The scope of patent protection of the present invention, the present invention can also carry out material to the structure of above-mentioned various parts
Material and the improvement of structure, or use technically equivalent ones to be replaced.Therefore all utilization present invention
The equivalent structure change that description and diagramatic content are made, or it is relevant directly or indirectly to apply to other
Technical field is the most all contained in the range of the present invention contained.
Claims (10)
1. the control method of an automatic interpolation anti-freezing solution, it is characterised in that comprise the steps:
Judge whether the cooling water of the heat exchanger surface in refrigeration plant freezes；
When controller detects that heat exchanger surface is in icing condition, control to add pump startup, add
Pump extracts anti-icing fluid in dense anti-icing fluid vessel, to refrigeration plant conveying antifreezing fluid；
When controller detects that interpolation anti-icing fluid completes, control described interpolation pump and close, terminate operation；
Wherein, it is judged that the cooling method that whether freezes of water of described heat exchanger surface include following method it
One or more method use,
By monitoring the cold-producing medium in cooler-water temperature and the heat exchanger of described refrigeration plant or refrigerating medium
Respective temperature or the relation between them or variation relation judge, or,
Closed by the relation between cooler-water temperature and the evaporating pressure of the described refrigeration plant of monitoring or change
System judges, or,
By monitoring pass between the cooler-water temperature of described refrigeration plant, evaporating pressure, condensing pressure
System or variation relation judge, or,
By the heat when monitoring cooler-water temperature of described refrigeration plant, evaporating pressure or heating operation
Relation or variation relation between the Inlet and outlet water temperature of water judge, or,
By the monitoring cooler-water temperature of described refrigeration plant, evaporating pressure, condensing pressure, compressor
Relation or variation relation between running current judge, or,
By the heat when monitoring cooler-water temperature of described refrigeration plant, evaporating pressure or heating operation
Between the Inlet and outlet water temperature of water, the relation of side discharge or variation relation is used to judge.
2. control method as claimed in claim 1, it is characterised in that set by monitoring described refrigeration
Whether the ice sheet of standby heat exchanger surface melts to judge whether anti-icing fluid has added.
3. control method as claimed in claim 2, it is characterised in that judge described heat exchanger surface
The method whether melted of ice sheet include one or more method the use of following method,
By monitoring the cold-producing medium in cooler-water temperature and the heat exchanger of described refrigeration plant or refrigerating medium
Respective temperature or the relation between them or variation relation judge, or,
Closed by the relation between cooler-water temperature and the evaporating pressure of the described refrigeration plant of monitoring or change
System judges, or,
By the cooler-water temperature of described monitoring control devices refrigeration plant, evaporating pressure, condensing pressure it
Between relation or variation relation judge, or,
Cooler-water temperature, evaporating pressure or heating operation by described monitoring control devices refrigeration plant
Time hot water Inlet and outlet water temperature between relation or variation relation judge, or,
By the cooler-water temperature of described monitoring control devices refrigeration plant, evaporating pressure, condensing pressure,
Relation or variation relation between compressor operating electric current judge, or,
Cooler-water temperature, evaporating pressure or heating operation by described monitoring control devices refrigeration plant
Time hot water Inlet and outlet water temperature between, use the relation of side discharge or variation relation to judge.
4. control method as claimed in claim 2, it is characterised in that by monitoring refrigeration plant
The ice sheet of heat exchanger surface whether melt before, one of also comprise the steps or partly or entirely:
Judge to add whether pump completes to start；
Judge whether the anti-icing fluid in dense antifreeze vessel is finished；
Judge whether refrigeration plant water tank has spilling water.
5. control method as claimed in claim 4, it is characterised in that judge to add whether pump completes
The method whether startup or anti-icing fluid are finished is:
Pump inlet and outlet pressure is added in monitoring, or whether the pressure differential imported and exported reaches setting value, when reaching
During setting value, it is believed that interpolation pump has been started up or anti-icing fluid has been used up.
6. control method as claimed in claim 4, it is characterised in that judge to add whether pump completes
The method whether startup or anti-icing fluid are finished is:
Monitoring is added pump and is imported and exported liquid flowing state, judges by arranging flow switch in import and export
The flow regime of liquid, judges whether interpolation pump has been started up or whether anti-icing fluid has been used up then.
7. control method as claimed in claim 4, it is characterised in that judge refrigeration plant water tank
Whether having spilling water is by drawing at water tank surface configuration water-level gauge.
8. control method as claimed in claim 1, it is characterised in that control described anti-icing fluid and add
The method added includes: set the time adding anti-icing fluid, when reaching to set time value, controls
Device controls to stop adding anti-icing fluid, is considered as anti-icing fluid and has added.
9. control method as claimed in claim 1, it is characterised in that monitor the cold of refrigeration plant
But water water temperature directly or indirectly can substitute by ambient side inlet temperature；Or evaporator pressure can be used
Suction pressure of compressor or evaporator pressure or evaporator outlet temperature directly or indirectly substitute；Or
Person's condensing pressure can with condensator outlet pressure or oil pressure or condensation temperature or pressure at expulsion directly or
Take over generation.
10. one kind uses the control method described in any of the above-described claim automatically to add anti-freeze-thaw
The control device of liquid, it is characterised in that including: dense anti-icing fluid vessel, interpolation pump and refrigeration plant,
Described refrigeration plant has a controller, when controller detects that the heat exchanger surface of refrigeration plant is in
During icing condition, control to add pump startup, add pump in dense anti-icing fluid vessel, extract anti-icing fluid, to
Refrigeration plant conveying antifreezing fluid；When controller detects that interpolation anti-icing fluid completes, control described interpolation
Pump cuts out, and terminates operation；Wherein, it is judged that the method whether the cooling water of described heat exchanger surface freezes
Including one or more method the use of following method,
By monitoring the cold-producing medium in cooler-water temperature and the heat exchanger of described refrigeration plant or refrigerating medium
Respective temperature or the relation between them or variation relation judge, or,
Closed by the relation between cooler-water temperature and the evaporating pressure of the described refrigeration plant of monitoring or change
System judges, or,
By monitoring pass between the cooler-water temperature of described refrigeration plant, evaporating pressure, condensing pressure
System or variation relation judge, or,
By the heat when monitoring cooler-water temperature of described refrigeration plant, evaporating pressure or heating operation
Relation or variation relation between the Inlet and outlet water temperature of water judge, or
By the monitoring cooler-water temperature of described refrigeration plant, evaporating pressure, condensing pressure, compressor
Relation or variation relation between running current judge, or,
By the heat when monitoring cooler-water temperature of described refrigeration plant, evaporating pressure or heating operation
Between the Inlet and outlet water temperature of water, the relation of side discharge or variation relation is used to judge.
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| CN201510058237.XA CN105987549B (en) | 2015-02-04 | 2015-02-04 | The control method and control device of automatic addition anti-freezing solution |
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| CN105987549B (en) | 2018-10-30 |
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