CN105987549B - The control method and control device of automatic addition anti-freezing solution - Google Patents
The control method and control device of automatic addition anti-freezing solution Download PDFInfo
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- CN105987549B CN105987549B CN201510058237.XA CN201510058237A CN105987549B CN 105987549 B CN105987549 B CN 105987549B CN 201510058237 A CN201510058237 A CN 201510058237A CN 105987549 B CN105987549 B CN 105987549B
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Abstract
The invention discloses a kind of control method and control device of automatic addition anti-freezing solution, this method includes：Judge whether the cooling water of the heat exchanger surface in refrigeration equipment freezes；When controller is detected in icing condition, control addition pump startup, addition pump extracts anti-icing fluid out of dense anti-icing fluid vessel, to refrigeration equipment conveying antifreezing fluid；When controller detects that addition anti-icing fluid is completed, controls the addition pump and close, terminate operation.Anti-icing fluid adding method provided by the present invention, it is applicable not only to the automatic addition of water cooling heat pump air-conditioning and transpiration-cooled heat pump air conditioner cooling water anti-icing fluid, it can also ensure that the additive amount of anti-icing fluid meets the operating condition requirement of real-time heat pump system, ensure the normal operation of air-conditioning system when low circumstance temperature operating mode, process is simple, accuracy is high, at low cost.
Description
Technical field
The present invention relates to field of refrigeration more particularly to the control methods and control dress of a kind of automatic addition anti-freezing solution
It sets.
Background technology
It is to prevent the cooling water freezing in water cooling heat pump air-conditioning or transpiration-cooled heat pump air conditioner from needing addition anti-in winter
Freeze liquid, existing anti-icing fluid addition manner is, according to the corresponding freezing point value of concentration value containing anti-icing fluid in water, using measuring cup,
It carries out manually adding anti-icing fluid again after the concentration value of anti-icing fluid in the Laboratory Instruments such as graduated cylinder detection water, however, this method uses
Pure manual operations, complicated for operation, inconvenient for use, error is larger, and cost is excessively high.
Invention content
In order to solve the above technical problems, the invention discloses a kind of control methods of automatic addition anti-freezing solution comprising
Following steps：
Judge whether the cooling water of the heat exchanger surface in refrigeration equipment freezes；
When controller detects that heat exchanger surface is in icing condition, control addition pump startup, addition is pumped from dense antifreeze
Anti-icing fluid is extracted in liquid vessel, to refrigeration equipment conveying antifreezing fluid；
When controller detects that addition anti-icing fluid is completed, controls the addition pump and close, terminate operation；
Further, in above-mentioned steps, under judging that method that whether cooling water of the heat exchanger surface freezes includes
One or more methods for stating method are used in combination,
The respective temperature of the refrigerant or refrigerating medium in cooler-water temperature and heat exchanger by monitoring the refrigeration equipment
Degree or the relationship between them or variation relation judge, alternatively,
Pass through the relationship or variation relation between the cooler-water temperature and evaporating pressure of the monitoring control devices refrigeration equipment
Judge, alternatively,
By relationship between the cooler-water temperature, evaporating pressure, condensing pressure of the monitoring control devices refrigeration equipment or
Variation relation judges, alternatively,
(it is heating operation by the cooler-water temperature of the monitoring control devices refrigeration equipment, evaporating pressure or using side
When hot water) relationship between disengaging coolant-temperature gage or variation relation judge, or
Pass through the cooler-water temperature of the monitoring control devices refrigeration equipment, evaporating pressure, condensing pressure, compressor operating electricity
Relationship or variation relation between stream judge, alternatively,
(it is heating operation by the cooler-water temperature of the monitoring control devices refrigeration equipment, evaporating pressure or using side
When hot water) between disengaging coolant-temperature gage, judged using the relationship of side water flow or variation relation.
Further, in the above-mentioned methods, judge by the way that whether the ice sheet of monitoring refrigeration equipment heat exchanger surface melts
Whether anti-icing fluid adds completion.
Further, in the above-mentioned methods, judge that the method whether ice sheet of the heat exchanger surface melts includes following
One or more methods of method are used in combination,
The respective temperature of the refrigerant or refrigerating medium in cooler-water temperature and heat exchanger by monitoring the refrigeration equipment
Degree or the relationship between them or variation relation judge, alternatively,
Pass through the relationship or variation relation between the cooler-water temperature and evaporating pressure of the monitoring control devices refrigeration equipment
Judge, alternatively,
By relationship between the cooler-water temperature, evaporating pressure, condensing pressure of the monitoring control devices refrigeration equipment or
Variation relation judges, alternatively,
By the cooler-water temperature of the monitoring control devices refrigeration equipment, evaporating pressure or using side (when heating operation
Hot water) relationship between disengaging coolant-temperature gage or variation relation judge, or
Pass through the cooler-water temperature of the monitoring control devices refrigeration equipment, evaporating pressure, condensing pressure, compressor operating electricity
Relationship or variation relation between stream judge, alternatively,
By the cooler-water temperature of the monitoring control devices refrigeration equipment, evaporating pressure or using side (when heating operation
Hot water) judge between disengaging coolant-temperature gage, using the relationship of side water flow or variation relation.
Further, in the above-mentioned methods, before whether the ice sheet of the heat exchanger surface by monitoring refrigeration equipment melts,
Further include one of following steps or partly or entirely：
Judge whether addition pump is completed to start；
Judge whether the anti-icing fluid in dense antifreeze vessel is finished；
Judge whether refrigeration equipment water tank has spilling water.
Further, in the above-mentioned methods, judge whether addition pump completes the method started or whether anti-icing fluid is finished
For：
Whether monitoring addition pump inlet and outlet pressure, or the pressure difference of inlet and outlet reach setting value, when reaching setting value, recognize
It is had been started up for addition pump or anti-icing fluid has been used up.
Further, in the above-mentioned methods, judge whether addition pump completes the method started or whether anti-icing fluid is finished
For：
Monitoring addition pump inlet and outlet liquid flowing state, by judging the flowing of liquid in inlet and outlet setting flow switch
State then judges whether addition pump has been started up or whether anti-icing fluid has been used up.
Further, in the above-mentioned methods, judge refrigeration equipment water tank whether to have spilling water to be by water tank surface being arranged
Water-level gauge obtains.
Further, in the above-mentioned methods, controlling the method that the anti-icing fluid addition is completed includes：Setting addition anti-icing fluid
Time, when reaching setting time value, controller control stop addition anti-icing fluid, be considered as anti-icing fluid addition complete.
Further, in the above-mentioned methods, monitoring the cooler-water temperature of refrigeration equipment can use ambient side inlet air temperature straight
It connects or substitutes indirectly；Or evaporator pressure can use suction pressure of compressor or evaporator pressure or evaporator outlet temperature
Degree directly or indirectly substitutes；Or condensing pressure can use condensator outlet pressure or oil pressure or condensation temperature or pressure at expulsion straight
It connects or substitutes indirectly.
Based on another aspect of the present invention, also provides and a kind of carrying out automatic addition anti-freezing solution using above-mentioned control method
Control device comprising：Dense anti-icing fluid vessel, addition pump and the refrigeration equipment being connected by pipeline, the refrigeration equipment
One controller is installed, when controller detects that the heat exchanger surface of refrigeration equipment is in icing condition, control addition pump opens
Dynamic, addition pump extracts anti-icing fluid out of dense anti-icing fluid vessel, to refrigeration equipment conveying antifreezing fluid；When controller detects that addition is anti-
When freezing liquid completion, controls the addition pump and close, terminate operation；Wherein, judge whether the cooling water of the heat exchanger surface is tied
The method of ice includes that one or more methods of following methods are used in combination：
The respective temperature of the refrigerant or refrigerating medium in cooler-water temperature and heat exchanger by monitoring the refrigeration equipment
Degree or the relationship between them or variation relation judge, alternatively,
Relationship between cooler-water temperature and evaporating pressure or variation relation by monitoring the refrigeration equipment judge,
Alternatively,
Relationship between cooler-water temperature, evaporating pressure, condensing pressure or variation by monitoring the refrigeration equipment are closed
System judges, alternatively,
By the cooler-water temperature of the monitoring refrigeration equipment, evaporating pressure or use side (heat when being heating operation
Water) relationship between disengaging coolant-temperature gage or variation relation judge, or
By between the cooler-water temperature of the monitoring refrigeration equipment, evaporating pressure, condensing pressure, compressor operating electric current
Relationship or variation relation judge, alternatively,
By the cooler-water temperature of the monitoring refrigeration equipment, evaporating pressure or use side (heat when being heating operation
Water) between disengaging coolant-temperature gage, judged using the relationship of side water flow or variation relation.
Compared with prior art, the control method of automatic addition anti-freezing solution provided by the present invention, is applicable not only to water
The automatic addition of cold-heat pump air-conditioning and transpiration-cooled heat pump air conditioner cooling water anti-icing fluid, it can also be ensured that the additive amount of anti-icing fluid
The operating condition requirement for meeting real-time heat pump system, ensures the normal operation of air-conditioning system when low circumstance temperature operating mode, process is simple,
Accuracy is high, at low cost.
Description of the drawings
Fig. 1 is the control dress that anti-icing fluid is added using the control method of automatic addition anti-freezing solution of the present invention
The connection diagram set；
Fig. 2 is the fundamental diagram of the control method of automatic addition anti-freezing solution of the present invention.
Specific implementation mode
The present invention is described in further details in the following with reference to the drawings and specific embodiments.
With reference to attached drawing 1, Fig. 1 is automatic using a kind of control method progress of automatic addition anti-freezing solution of the present invention
The principle schematic of the control device of anti-icing fluid is added, the control method and device are suitable for water cooling heat pump air-conditioning or evaporation cooling
Automatically refrigeration systems or cooling water system field, the control device such as addition include dense to cooling water anti-icing fluid in formula heat pump air conditioner
Anti-icing fluid vessel 1, addition pump 2 and refrigeration equipment 3, the refrigeration equipment 3 can be transpiration-cooled water chiller-heater unit or steaming
Hairdo condenser or closed cooling tower or heat source tower either water chiller combined heat source tower or air conditioner integrated unit, refrigeration equipment
3 include a controller, between anti-icing fluid vessel 1 and addition pump 2, and is connected by pipeline between addition pump 2 and refrigeration equipment 3
It connects, addition pump 2 is instructed by refrigeration equipment, is started or is closed, and the anti-icing fluid in control anti-icing fluid vessel 1 is exported from pipeline to system
In cool equipment.Evaporator and condenser belong to strong phase-change heat-exchange process, i.e. boiling heat transfer and condensing heat-exchange.Refrigeration equipment exists
Heat exchanger surface moisture film is when compared under low ambient temperature without addition antifreezing agent or inadequate antifreeze concentration during winter heating
It can generally freeze, the real-time 4 surface ice condition of heat exchanging device of controller is monitored, when evaporative condenser or closed cooling tower
In 4 surface moisture film of heat exchanger when freezing, controller can give the instructions that addition pump 2 send out addition anti-icing fluid, the addition to pump 2 and be
Electrifying startup, by the water receiving case in the dense antifreeze liquid pump to evaporative condenser or closed cooling tower in dense anti-icing fluid vessel 1,
Realize the automatic addition of anti-icing fluid.It can ensure that the additive amount of anti-icing fluid meets in real time with the device of control method of the present invention
The operating condition requirement of heat pump system, ensures the normal operation of air-conditioning system when low circumstance temperature operating mode.
Fig. 2 shows a kind of fundamental diagrams of the control method of automatic addition anti-freezing solution of the present invention.
The control method comprises the following steps：
Step S1：Judge whether the cooling water of the heat exchanger surface in refrigeration equipment freezes.
Judge whether to freeze and there are following several methods.
Method one：Controller monitors refrigerant in the cooler-water temperature and heat exchanger of refrigeration equipment or refrigerating medium in real time
Temperature change passes through the letter for detecting obtained cooler-water temperature and refrigerant temperature or refrigerant temperature and being formed between them
Number relationship or fuzzy logical relationship judge whether the cooling water of heat exchanger surface freezes.By taking formula Q=KA Δs T as an example, K is heat transfer
Coefficient, A are heat exchange area, and Δ T is the temperature difference of cooling water and refrigerant or refrigerating medium, when mono- timings of heat exchange amount Q, if Δ T increases
Add it is larger or bigger than preset value, then explanation have icing or as there is icing, if Q/ Δs T becomes very little, that is to say, that there is knot
Ice can be used as icing.Fuzzy logical relationship of the present invention refers to that not necessarily must accurately judge that the function is true
Real relationship change, as long as can judge the rough change curve of the two or functional relation in principle.In addition, logical
The cooler-water temperature and refrigerant temperature or refrigerant temperature for crossing the monitoring control devices refrigeration equipment also monitor compressor simultaneously
Pressure at expulsion, evaporator exit pressure, evaporator outlet temperature, oil pressure, condensing pressure, condensation temperature, compressor operating electric current,
Using side (hot water when being heating operation) disengaging coolant-temperature gage, using between some or all of side water flow parameter quantity of state
Relationship or variation relation judge whether cooling water freezes.
Method two：Controller monitors the cooler-water temperature of refrigeration equipment, evaporating pressure respectively quantity of state or respective in real time
Variable quantity and the relationship between them or variation relation, by detecting the letter between obtained cooler-water temperature and evaporating pressure
Number relationship or fuzzy logical relationship judge whether the cooling water of heat exchanger surface freezes.Similarly, in formula Q=KA Δs T, because of evaporation
Temperature can be stated by evaporating pressure P, therefore it is related with evaporating pressure P and cooling water temperature to be expressed as Δ T, in addition, passing through
When stating the variation between the cooler-water temperature and evaporating pressure of monitoring control devices refrigeration equipment, judgement heat exchange in order to be more accurate
Whether device surface freezes, and can also be used as the means of auxiliary judgment by following methods.I.e. in the cooling of monitoring refrigeration equipment
While water water temperature and evaporating pressure, also while Compressor Discharge Pressure, evaporator outlet temperature, oil pressure are monitored, condensing pressure,
Condensation temperature, compressor operating electric current, using side disengaging coolant-temperature gage, using some or all of side water flow parameter quantity of state it
Between relationship or variation relation judge whether cooling water freezes.
Method three：Controller monitors the relationship between the cooler-water temperature, evaporating pressure, condensing pressure of refrigeration equipment in real time
Or variation relation, it is patrolled by detecting the functional relation between obtained cooler-water temperature and evaporating pressure, condensing pressure or obscuring
The relationship of collecting judges whether the cooling water of heat exchanger surface freezes.Similarly, in formula Q=KA Δs T, Δ T it is related with evaporating pressure P and
Cooling water temperature is related, and Q is related with evaporating pressure and condensing pressure, at the same can also monitor Compressor Discharge Pressure, evaporator goes out
Mouthful temperature, oil pressure, condensation temperature, compressor operating electric current, using side disengaging coolant-temperature gage, using side water flow parameter part or
Relationship or variation relation between whole quantity of states judge whether cooling water freezes.
Method four：Controller monitor in real time the cooler-water temperature of refrigeration equipment, evaporating pressure, using side disengaging coolant-temperature gage it
Between relationship or variation relation, between detecting obtained cooler-water temperature and evaporating pressure, passing in and out coolant-temperature gage using side
Functional relation or fuzzy logical relationship judge whether the cooling water of heat exchanger surface freezes.Similarly, in formula Q=KA Δs T, Δ T
Related and cooling water temperature is related with evaporating pressure P, and Q is related with using side disengaging coolant-temperature gage, while can also monitor compressor row
Atmospheric pressure, evaporator outlet temperature, oil pressure, condensing pressure, compressor operating electric current, use side water flow parameter at condensation temperature
Some or all of relationship between quantity of state or variation relation judge whether cooling water freezes.
Method five：Cooler-water temperature, evaporating pressure, condensing pressure, the compressor that controller monitors refrigeration equipment in real time are transported
Relationship between row electric current or variation relation pass in and out water temperature by detecting obtained cooler-water temperature with evaporating pressure, using side
Functional relation or fuzzy logical relationship between degree judge whether the cooling water of heat exchanger surface freezes.Similarly, formula Q=KA Δs
In T, Δ T is related with evaporating pressure P and cooling water temperature is related, and Q has with evaporating pressure, condensing pressure and compressor operating electric current
Close, while can also monitor Compressor Discharge Pressure, evaporator outlet temperature, oil pressure, condensation temperature, using side disengaging coolant-temperature gage,
Using between some or all of side water flow parameter quantity of state relationship or variation relation judge whether cooling water freezes.
Method six：The cooler-water temperature, evaporating pressure or use side that controller monitors refrigeration equipment in real time pass in and out coolant-temperature gage
Between, using the relationship or variation relation between the water flow of side, by detecting obtained cooler-water temperature and evaporating pressure, using
Side disengaging coolant-temperature gage, using between the water flow of side functional relation or fuzzy logical relationship judge that the cooling water of heat exchanger surface is
No icing.Similarly, in formula Q=KA Δs T, Δ T is related with evaporating pressure P and cooling water temperature is related, Q and use side Inlet and outlet water
It is temperature, related using side water flow, while can also monitor Compressor Discharge Pressure, evaporator exit pressure, evaporator outlet temperature
It spends, oil pressure, the relationship between some or all of condensing pressure, condensation temperature, compressor operating current parameters quantity of state or change
Change relationship judges whether cooling water freezes.
Step S2：When controller detects that heat exchanger surface is in icing condition, control addition pump startup, addition pump from
Anti-icing fluid is extracted in dense anti-icing fluid vessel, to refrigeration equipment conveying antifreezing fluid.
Step S3：When controller detects that addition anti-icing fluid is completed, controls the addition pump and close, terminate operation.
Specifically, it is by judging evaporative condenser or enclosed cooling that whether monitoring control devices anti-icing fluid, which adds completion,
Whether the ice sheet of tower heat exchanger surface melts completion.
It includes following several methods to judge whether ice sheet melts completion.
Method one：Controller monitors refrigerant in the cooler-water temperature and heat exchanger of refrigeration equipment or refrigerating medium in real time
Temperature change passes through the letter for detecting obtained cooler-water temperature and refrigerant temperature or refrigerant temperature and being formed between them
Number relationship or fuzzy logical relationship judge whether the cooling water of heat exchanger surface freezes.By taking formula Q=KA Δs T as an example, K is heat transfer
Coefficient, A are heat exchange area, and Δ T is the temperature difference of cooling water and refrigerant or refrigerating medium, when mono- timings of heat exchange amount Q, if Δ T increases
Add it is larger or bigger than preset value, then explanation have icing or as there is icing, if Q/ Δs T becomes very little, that is to say, that there is knot
Ice can be used as icing.Fuzzy logical relationship of the present invention refers to that not necessarily must accurately judge that the function is true
Real relationship change, as long as can judge the rough change curve of the two or functional relation in principle.In addition, logical
The cooler-water temperature and refrigerant temperature or refrigerant temperature for crossing the monitoring control devices refrigeration equipment also monitor compressor simultaneously
Pressure at expulsion, evaporator exit pressure, evaporator outlet temperature, oil pressure, condensing pressure, condensation temperature, compressor operating electric current,
Using side (hot water when being heating operation) disengaging coolant-temperature gage, using between some or all of side water flow parameter quantity of state
Relationship or variation relation judge whether cooling water melts.
Method two：Controller monitors the cooler-water temperature of refrigeration equipment, evaporating pressure respectively quantity of state or respective in real time
Variable quantity and the relationship between them or variation relation, by detecting the letter between obtained cooler-water temperature and evaporating pressure
Number relationship or fuzzy logical relationship judge whether the cooling water of heat exchanger surface freezes.Similarly, in formula Q=KA Δs T, because of evaporation
Temperature can be stated by evaporating pressure P, therefore it is related with evaporating pressure P and cooling water temperature to be expressed as Δ T, in addition, passing through
When stating the variation between the cooler-water temperature and evaporating pressure of monitoring control devices refrigeration equipment, judgement heat exchange in order to be more accurate
Whether device surface freezes, and can also be used as the means of auxiliary judgment by following methods.I.e. in the cooling of monitoring refrigeration equipment
While water water temperature and evaporating pressure, also while Compressor Discharge Pressure, evaporator outlet temperature, oil pressure are monitored, condensing pressure,
Condensation temperature, compressor operating electric current, using side disengaging coolant-temperature gage, using some or all of side water flow parameter quantity of state it
Between relationship or variation relation judge whether cooling water melts.
Method three：Controller monitors the relationship between the cooler-water temperature, evaporating pressure, condensing pressure of refrigeration equipment in real time
Or variation relation, it is patrolled by detecting the functional relation between obtained cooler-water temperature and evaporating pressure, condensing pressure or obscuring
The relationship of collecting judges whether the cooling water of heat exchanger surface freezes.Similarly, in formula Q=KA Δs T, Δ T it is related with evaporating pressure P and
Cooling water temperature is related, and Q is related with evaporating pressure and condensing pressure, at the same can also monitor Compressor Discharge Pressure, evaporator goes out
Mouthful temperature, oil pressure, condensation temperature, compressor operating electric current, using side disengaging coolant-temperature gage, using side water flow parameter part or
Relationship or variation relation between whole quantity of states judge whether cooling water melts.
Method four：Controller monitor in real time the cooler-water temperature of refrigeration equipment, evaporating pressure, using side disengaging coolant-temperature gage it
Between relationship or variation relation, between detecting obtained cooler-water temperature and evaporating pressure, passing in and out coolant-temperature gage using side
Functional relation or fuzzy logical relationship judge whether the cooling water of heat exchanger surface freezes.Similarly, in formula Q=KA Δs T, Δ T
Related and cooling water temperature is related with evaporating pressure P, and Q is related with using side disengaging coolant-temperature gage, while can also monitor compressor row
Atmospheric pressure, evaporator outlet temperature, oil pressure, condensing pressure, compressor operating electric current, use side water flow parameter at condensation temperature
Some or all of relationship between quantity of state or variation relation judge whether cooling water melts.
Method five：Cooler-water temperature, evaporating pressure, condensing pressure, the compressor that controller monitors refrigeration equipment in real time are transported
Relationship between row electric current or variation relation pass in and out water temperature by detecting obtained cooler-water temperature with evaporating pressure, using side
Functional relation or fuzzy logical relationship between degree judge whether the cooling water of heat exchanger surface freezes.Similarly, formula Q=KA Δs
In T, Δ T is related with evaporating pressure P and cooling water temperature is related, and Q has with evaporating pressure, condensing pressure and compressor operating electric current
Close, while can also monitor Compressor Discharge Pressure, evaporator outlet temperature, oil pressure, condensation temperature, using side disengaging coolant-temperature gage,
Using between some or all of side water flow parameter quantity of state relationship or variation relation judge whether cooling water melts.
Method six：The cooler-water temperature, evaporating pressure or use side that controller monitors refrigeration equipment in real time pass in and out coolant-temperature gage
Between, using the relationship or variation relation between the water flow of side, by detecting obtained cooler-water temperature and evaporating pressure, using
Side disengaging coolant-temperature gage, using between the water flow of side functional relation or fuzzy logical relationship judge that the cooling water of heat exchanger surface is
No icing.Similarly, in formula Q=KA Δs T, Δ T is related with evaporating pressure P and cooling water temperature is related, Q and use side Inlet and outlet water
It is temperature, related using side water flow, while can also monitor Compressor Discharge Pressure, evaporator exit pressure, evaporator outlet temperature
It spends, oil pressure, the relationship between some or all of condensing pressure, condensation temperature, compressor operating current parameters quantity of state or change
Change relationship judges whether cooling water melts.
Wherein, it should be noted that in the above-described embodiments, characterization Δ T's can be direct cooling water temperature, refrigeration
Agent temperature or refrigerant temperature can also be environment temperature or inlet air temperature, refrigerant temperature or refrigerant temperature.Characterization refrigeration
Agent temperature can be the internal refrigeration storage agent temperature of detection, can also be one of evaporating pressure, pressure of inspiration(Pi), evaporator pressure
Pressure dependence.Characterization Q's can be that compressor operating quantity or operating status or supplying hot water disengaging water temperature or its water flow are closed
System 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 also has the case where with heat exchanger heat exchange amount related, for example, the fortune of cooling blower
Line number amount or air quantity or efficiency are related in relation to, the operation quantity of cooling water pump or flow or frequency.
Further, it is also possible to when close addition pump by control time to set, that is, one section is previously set from the beginning of
Addition anti-icing fluid to the time for terminating to add anti-icing fluid thinks that adding procedure is received when setting time arrives, controller control is closed
Addition pump is closed, this method can also be realized.
It, can also be by following before being judged by the above method in order to more accurately judge whether ice sheet melts
One of step partly or entirely goes to judge.
First determine whether the addition pump is completed to start.Pump can be added by monitoring by judging whether addition pump is completed to start
The variation of the difference of inlet and outlet pressure judges to obtain, about the difference of pressure, can be previously set, when the difference of the pressure of disengaging reaches
When certain first setting value, that is, think that addition pump has been started up；Or add pump inlet and outlet fluid flow state variation by monitoring
Judge to obtain, about the monitoring of flow regime, can be higher than in water flow by judge in inlet and outlet setting water flow switch
Or trigger output alarm signal when less than some set point and pass to controller, controller can make after obtaining signal
Corresponding instruction action, realizes the purpose controlled with water flow.
Addition pump is completed after starting, and will constantly be extracted from the anti-icing fluid in dense anti-icing fluid vessel and is delivered to refrigeration equipment
In.
Secondly, then judge whether the anti-icing fluid in the dense anti-icing fluid vessel is finished.Judge antifreeze in anti-icing fluid vessel
Whether liquid, which is finished, to judge to obtain by monitoring the variation for the difference for adding pump inlet and outlet pressure, when the difference of the pressure of disengaging reaches
When certain second setting value, that is, think that anti-icing fluid has run out, or pump inlet and outlet fluid flow state variation is added by monitoring
To judge to obtain.Its judgment method and it is above-mentioned judge addition pump whether complete to start it is essentially identical, and by monitor pressure it
Difference and water flow switch are opposite with the above process come the variation of the difference for the pressure realized, but obtained and the variation of water flow switch.
Finally, judge whether evaporative condenser or closed cooling tower water tank have spilling water.Spilling water is judged whether there is, can be passed through
The water level in evaporative condenser or closed cooling tower water tank is monitored to judge to obtain.The monitoring of water level can pass through water level sensor
Or water level switch is realized.
It can be accurately judged to using the data monitoring whether melted to ice sheet by the monitoring of above three process
Whether ice sheet melts, and then provides corresponding control signal by controller.
When addition pump can not be completed to start, the anti-icing fluid in dense anti-icing fluid vessel has run out, evaporative condenser or close
Formula cooling tower water tank has the heat exchanger surface in spilling water or evaporative condenser or closed cooling tower to melt completion, and controller is sent out
Addition pump out code.After cooling water system receives stopping addition anti-icing fluid instruction, addition pump stops addition anti-icing fluid operation, whole
A process terminates.Control device using the present invention carries out automatic addition anti-freezing solution to judging whether to freeze and whether melt
Method is consistent with above-mentioned stated control method, 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 air conditioner cooling water
The automatic addition of anti-icing fluid, it is also ensured that the additive amount of anti-icing fluid meets the operating condition requirement of real-time heat pump system, ensures
The normal operation of air-conditioning system when low circumstance temperature operating mode, process is simple, accuracy is high, at low cost.
It is worth noting that, the foregoing is merely presently preferred embodiments of the present invention, the patent of the present invention is not thereby limited
Protection domain, the present invention can also carry out the construction of above-mentioned various parts the improvement of material and structure, or use skill
Art equivalent is replaced.Therefore it is all with the present invention specification and diagramatic content made by equivalent structure variation, or directly or
Apply to other correlative technology fields indirectly to be similarly all contained in the range of of the invention cover.
Claims (9)
1. a kind of control method of automatic addition anti-freezing solution, it is characterised in that include the following steps：
Judge whether the cooling water of the heat exchanger surface in refrigeration equipment freezes；
When controller detects that heat exchanger surface is in icing condition, control addition pump startup, addition is pumped from dense anti-icing fluid device
Anti-icing fluid is extracted in ware, to refrigeration equipment conveying antifreezing fluid；
When controller detects that addition anti-icing fluid is completed, controls the addition pump and close, terminate operation；
Wherein, judge method that whether cooling water of the heat exchanger surface freezes include one or more methods of following methods simultaneously
With,
The respective temperature of the refrigerant or refrigerating medium in cooler-water temperature and heat exchanger by monitoring the refrigeration equipment or
Relationship or variation relation between them judge, alternatively,
Relationship between cooler-water temperature and evaporating pressure or variation relation by monitoring the refrigeration equipment judge, or
Person,
Relationship between cooler-water temperature, evaporating pressure, condensing pressure or variation relation by monitoring the refrigeration equipment come
Judge, alternatively,
The disengaging coolant-temperature gage of hot water when by the cooler-water temperature, evaporating pressure or heating operation that monitor the refrigeration equipment
Between relationship or variation relation judge, alternatively,
Pass through the pass between the cooler-water temperature of the monitoring refrigeration equipment, evaporating pressure, condensing pressure, compressor operating electric current
System or variation relation judge, alternatively,
The disengaging coolant-temperature gage of hot water when by the cooler-water temperature, evaporating pressure or heating operation that monitor the refrigeration equipment
Between, judged using the relationship of side water flow or variation relation；
Wherein, judge whether anti-icing fluid has added by the way that whether the ice sheet of the monitoring refrigeration equipment heat exchanger surface melts
At.
2. control method as described in claim 1, which is characterized in that judge what whether the ice sheet of the heat exchanger surface melted
Method includes that one or more methods of following methods are used in combination,
The respective temperature of the refrigerant or refrigerating medium in cooler-water temperature and heat exchanger by monitoring the refrigeration equipment or
Relationship or variation relation between them judge, alternatively,
Relationship between cooler-water temperature and evaporating pressure or variation relation by monitoring the refrigeration equipment judge, or
Person,
Pass through relationship between the cooler-water temperature, evaporating pressure, condensing pressure of the monitoring control devices refrigeration equipment or variation
Relationship judges, alternatively,
The disengaging of hot water when by the cooler-water temperature, evaporating pressure or heating operation of the monitoring control devices refrigeration equipment
Relationship or variation relation between coolant-temperature gage judge, alternatively,
By the cooler-water temperature of the monitoring control devices refrigeration equipment, evaporating pressure, condensing pressure, compressor operating electric current it
Between relationship or variation relation judge, alternatively,
The disengaging of hot water when by the cooler-water temperature, evaporating pressure or heating operation of the monitoring control devices refrigeration equipment
Judge between coolant-temperature gage, using the relationship of side water flow or variation relation.
3. control method as described in claim 1, which is characterized in that in the ice of the heat exchanger surface by monitoring refrigeration equipment
Layer whether melt before, further include one of following steps or partly or entirely：
Judge whether addition pump is completed to start；
Judge whether the anti-icing fluid in dense antifreeze vessel is finished；
Judge whether refrigeration equipment water tank has spilling water.
4. control method as claimed in claim 3, which is characterized in that judge whether addition pump is completed to start or anti-icing fluid is
The no method being finished is：
Whether monitoring addition pump inlet and outlet pressure, or the pressure difference of inlet and outlet reach setting value, when reaching setting value, it is believed that add
Add that pump has been started up or anti-icing fluid has been used up.
5. control method as claimed in claim 3, which is characterized in that judge whether addition pump is completed to start or anti-icing fluid is
The no method being finished is：
Monitoring addition pump inlet and outlet liquid flowing state, by judging the flowing shape of liquid in inlet and outlet setting flow switch
State then judges whether addition pump has been started up or whether anti-icing fluid has been used up.
6. control method as claimed in claim 3, which is characterized in that judge refrigeration equipment water tank whether have spilling water be by
Water tank surface setting water-level gauge obtains.
7. control method as described in claim 1, which is characterized in that controlling the method that the anti-icing fluid addition is completed includes：
The time of setting addition anti-icing fluid, when reaching setting time value, controller control stops addition anti-icing fluid, is considered as anti-icing fluid and adds
It adds into.
8. control method as described in claim 1, which is characterized in that environment can be used by monitoring the cooler-water temperature of refrigeration equipment
Side inlet air temperature directly or indirectly substitutes；Or evaporator pressure can use suction pressure of compressor or evaporator pressure or
Evaporator outlet temperature directly or indirectly substitutes；Or condensing pressure can use condensator outlet pressure or oil pressure or condensation temperature
Or pressure at expulsion directly or indirectly substitutes.
9. a kind of control method using described in any of the above-described claim carries out the control device of automatic addition anti-freezing solution,
Be characterized in that include：Dense anti-icing fluid vessel, addition pump and refrigeration equipment, the refrigeration equipment have a controller, work as control
When device detects that the heat exchanger surface of refrigeration equipment is in icing condition, control addition pump startup, addition is pumped from dense anti-icing fluid device
Anti-icing fluid is extracted in ware, to refrigeration equipment conveying antifreezing fluid；When controller detects that addition anti-icing fluid is completed, add described in control
Add pump to close, terminates operation；Wherein, judge method that whether cooling water of the heat exchanger surface freezes include following methods it
One or more methods are used in combination,
The respective temperature of the refrigerant or refrigerating medium in cooler-water temperature and heat exchanger by monitoring the refrigeration equipment or
Relationship or variation relation between them judge, alternatively,
Relationship between cooler-water temperature and evaporating pressure or variation relation by monitoring the refrigeration equipment judge, or
Person,
Relationship between cooler-water temperature, evaporating pressure, condensing pressure or variation relation by monitoring the refrigeration equipment come
Judge, alternatively,
The disengaging coolant-temperature gage of hot water when by the cooler-water temperature, evaporating pressure or heating operation that monitor the refrigeration equipment
Between relationship or variation relation judge, or
Pass through the pass between the cooler-water temperature of the monitoring refrigeration equipment, evaporating pressure, condensing pressure, compressor operating electric current
System or variation relation judge, alternatively,
The disengaging coolant-temperature gage of hot water when by the cooler-water temperature, evaporating pressure or heating operation that monitor the refrigeration equipment
Between, judged using the relationship of side water flow or variation relation；
Wherein, judge whether anti-icing fluid has added by the way that whether the ice sheet of the monitoring refrigeration equipment heat exchanger surface melts
At.
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| CN108168146A (en) * | 2018-02-02 | 2018-06-15 | 韩军 | A kind of refrigeration and discharge superheat control method in heat pump unit |
| CN108266832B (en) * | 2018-02-06 | 2023-12-01 | 贵州电网有限责任公司 | Solution type frosting prevention compound outdoor heat exchange device |
| CN113503628B (en) * | 2021-07-13 | 2022-06-14 | 珠海格力电器股份有限公司 | Air conditioning unit parameter adjusting method and device, electronic equipment and storage medium |
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