CN104344618B - Intelligent defrosting air conditioning system and control method thereof - Google Patents
Intelligent defrosting air conditioning system and control method thereof Download PDFInfo
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- CN104344618B CN104344618B CN201310327242.7A CN201310327242A CN104344618B CN 104344618 B CN104344618 B CN 104344618B CN 201310327242 A CN201310327242 A CN 201310327242A CN 104344618 B CN104344618 B CN 104344618B
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- compressor
- control valve
- air conditioning
- conditioning system
- controller
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Classifications
-
- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
-
- 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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides an intelligent defrosting air conditioning system and a control method thereof. The intelligent defrosting air conditioning system comprises a compressor, a reversing valve, an outdoor heat exchanger, a first throttling component, a coolant circulation loop formed by an indoor heat exchanger and a controller controlling operation of the air conditioning system; a coolant adjusting pipeline structure including control valves, and a liquid reservoir and a temperature sensor which is used for detecting discharge temperature of the compressor are arranged between a liquid-side pipe and a gas-side pipe. When the air conditioning system is defrosted, the system controls the corresponding control valves to be connected or disconnected to adjust the amount of coolants of the system according to the discharge temperature, detected by the temperature sensor, of the compressor, effective defrosting of the air conditioning system is guaranteed, liquid impact caused by the fact that the liquid coolants flow back to the compressor is avoided, and accordingly, safety of the air conditioning system is improved.
Description
Technical field
The invention belongs to from air-conditioning technical field, more specifically, being to be related to a kind of intelligent defrosting air conditioning system and its control
Method processed.
Background technology
When air conditioning system runs heating mode, outdoor temperature is typically all relatively low, and outdoor heat exchanger also needs to absorb heat
Amount, at this moment outdoor unit heat exchanger body temperature can drop to less than 0 DEG C, and the moisture of surrounding will soon condense into frost and accumulate and changing
On hot device, if not defrosting, off-premises station is likely to be blocked by ice cube, has a strong impact on heat exchanger radiating efficiency and effect, if ice cube
Tie thicker and thicker, or even situation about cannot radiating occurs, ultimately result in the coolant in off-premises station and cannot evaporate so that system pressure
Too low can jump low-voltage variation and shut down.
Existing air-conditioning is substantially all the function with outdoor defrosting in itself, reaches the standard of setting when temperature, time, just
Meeting automatic running defrosting mode is to solve the problems, such as frosting.And in system operation defrosting mode, air conditioning system direct transformation of ownership heat
For refrigeration mode, off-premises station blower fan and indoor set blower fan are all out of service, and heat exchanger effectively can not carry out heat exchange, is easily caused liquid
State coolant flow back into compressor, causes liquid hit phenomenon to damage the service life subtracting air conditioning system or cause potential safety hazard.
Content of the invention
It is an object of the invention to provide a kind of structure is simple, control intelligent defrosting accurate, easy and simple to handle, with low cost
Air conditioning system and its control method are it is intended to overcome prior art to know deficiency it is ensured that air conditioning system is while effective defrosting, and energy
Avoid liquid refrigerant stream to return compressor and cause liquid hammer, thus improving the safety of air conditioning system.
For achieving the above object, the technical solution used in the present invention is：There is provided a kind of intelligent defrosting air conditioning system, including logical
Cross pipeline connect at least one compressor, reversal valve, outdoor heat exchanger, first throttle part, indoor heat exchanger formed coolant follow
Loop back path and the controller controlling air conditioning system operation；
Pipeline between described outdoor heat exchanger and described first throttle part is also associated with a coolant and adjusts bypass branch,
Described coolant adjusts and is sequentially serially connected with first control valve being controlled by described controller and a fluid reservoir on bypass branch, described
One gaseous coolant is connected with fluid reservoir and adjusts pipeline and liquid refrigerants regulation pipeline；
Described gaseous coolant is adjusted pipeline and is connected with the air entry of described compressor by gas side line, and this gaseous coolant
Adjust pipeline and be provided with second control valve being controlled by described controller；
Described liquid refrigerants is adjusted pipeline and is connected with the air entry of described compressor by gas side line, and this liquid pipeline
On be sequentially serially connected with one second throttle part and the 3rd control valve being controlled by described controller；
Pipeline between the air vent of described compressor and described reversal valve is provided with one for detecting the aerofluxuss of compressor
Temperature simultaneously feeds back to the temperature sensor of controller.
Further, described fluid reservoir is additionally provided with and is controlled by described controller, for the coolant in described fluid reservoir
The refrigerant heater of heating.
Further, it is connected with a gas-liquid separator with described compressor air suction mouth.
Further, described gas side line is additionally provided with the air entry of described compressor one to be used for detecting system
Low pressure and feed back to the pressure transducer of controller.
Preferably, described reversal valve is solenoid operated four-way valve, the D mouth of pipe of described solenoid operated four-way valve, the E mouth of pipe, the S mouth of pipe and C pipe
Mouth is connected respectively the air vent of described compressor, described indoor heat exchanger, the air entry of described compressor, described outdoor are changed
Hot device.
Alternatively, described first throttle part and/or described second throttle part are capillary tube, electric expansion valve, heating power
One of expansion valve.
Alternatively, described first control valve and/or described second control valve and/or described 3rd control valve be electromagnetic valve or
Electric expansion valve.
The having the beneficial effects that of intelligent defrosting air conditioning system that the present invention provides：Intelligent defrosting air conditioning system of the present invention is existing
Set up coolant between the gentle lateral line of liquid lateral line in some common air-conditioning systems and supplement pipeline and corresponding control valve, can
Corresponding instruction control is made according to system compressor exhaust temperature in defrost mode and/or low pressure by controller
Make corresponding control valve break-make, in real time, accurately to the coolant of the supplementary corresponding state in system low-voltage side, reach and ensureing effective
While defrosting, it is avoided that liquid refrigerant stream returns the purpose that compressor causes liquid hit phenomenon, thus improve air conditioning system again
Safety；And, intelligent defrosting air conditioning system structure of the present invention is simple, easy and simple to handle, with low cost.
For achieving the above object, the present invention also provides the control method of above-mentioned intelligent defrosting air conditioning system, described control
Method comprises the following steps：
(1) start air conditioning system and enter defrosting mode operation；
(2) described first control valve is opened, described second control valve is opened, described 3rd control valve for described controller control
Close；
(3) described temperature sensor detects the delivery temperature of described compressor and feeds back to described controller, and aforementioned dynamic
Often interval time set in advance in the program of described controller is repeated once work；
(4) described controller relatively and judges the compressor air-discharging that described in step (3), temperature sensor detects and feeds back
Whether temperature is less than reference temperature value set in advance in the program of described controller：
A. if so, then described 3rd control valve remains off；
B. if it is not, then described controller control described 3rd control valve to open, the liquid refrigerants flowing out in described fluid reservoir
Flow into the return-air side of described compressor after the second throttle part, to reduce the delivery temperature of described compressor；When described compression
When the delivery temperature of machine is less than described reference temperature value, described controller controls described 3rd control valve to cut out；
(5) repeat the above steps (3), (4) are terminated up to defrosting process, and described controller controls described first control valve to close
Close.
For achieving the above object, the present invention also provides the control method of above-mentioned intelligent defrosting air conditioning system, described control
Method comprises the following steps：
(1) open air conditioning system and enter defrosting mode operation；
(2) described controller controls described first control valve to open, described second control valve is closed, described 3rd control valve
Close, part coolant flows in described fluid reservoir；
(3) described pressure transducer detects the low pressure of air conditioning system and feeds back to described controller, and aforementioned activities
Often in the program of described controller, interval time set in advance is repeated once；Described temperature sensor detects described compression
The delivery temperature of machine simultaneously feeds back to described controller, and aforementioned activities are often set in advance in the program of described controller
It is repeated once every the time；
(4) whether described controller relatively and judges low pressure described in step (3) more than the journey in described controller
Base pressure force value set in advance in sequence：
A. if so, then described second control valve remains off；
B. if it is not, then described controller control described second control valve to open, the gaseous coolant flowing out in described fluid reservoir
Flow into described gas side line and described compressor, increase the low pressure of system；When the low pressure of system is more than described benchmark
During pressure value, described controller controls described second control valve to cut out；
(5) described controller relatively and judges the compressor air-discharging that described in step (3), temperature sensor detects and feeds back
Whether temperature is less than reference temperature value set in advance in the program of described controller：
A. if so, then described 3rd control valve remains off；
B. if it is not, then described controller control described 3rd control valve to open, the liquid refrigerants flowing out in described fluid reservoir
Flow into the return-air side of described compressor after the second throttle part, to reduce the delivery temperature of described compressor；When described compression
When the delivery temperature of machine is less than described reference temperature value, described controller controls described 3rd control valve to cut out；
(6) repeat the above steps (3), (4), (5) are terminated up to defrosting process, and described controller controls described first control
Valve cuts out.
Further, also include in described step (4)：
If a. described low pressure is more than described base pressure force value, described refrigerant heater remains powered off state and not right
Coolant heating in described fluid reservoir；
If b. described low pressure is less than or equal to described base pressure force value, work pair is opened in described refrigerant heater energising
Coolant heating in described fluid reservoir, when the described low pressure of system is more than described base pressure force value, described coolant heating
Device recovers off-position.
The control method control of the intelligent defrosting air conditioning system that the present invention provides is accurate, easy and simple to handle, both can ensure having
While effect defrosting, it is avoided that liquid refrigerant stream returns compressor and causes liquid hit phenomenon again, improves the safety of air conditioning system.
Brief description
The theory structure of the intelligent defrosting air conditioning system that Fig. 1 provides for the embodiment of the present invention one and running status figure one；
The theory structure of the intelligent defrosting air conditioning system that Fig. 2 provides for the embodiment of the present invention one and running status figure two；
The principle assumption diagram of the intelligent defrosting air conditioning system that Fig. 3 provides for the embodiment of the present invention two；
The principle assumption diagram of the intelligent defrosting air conditioning system that Fig. 4 provides for the embodiment of the present invention three；
The principle assumption diagram of the intelligent defrosting air conditioning system that Fig. 5 provides for the embodiment of the present invention four；
The theory structure of the intelligent defrosting air conditioning system that Fig. 6 provides for the embodiment of the present invention five and running status figure one；
The theory structure of the intelligent defrosting air conditioning system that Fig. 7 provides for the embodiment of the present invention five and running status figure two；
The theory structure of the intelligent defrosting air conditioning system that Fig. 8 provides for the embodiment of the present invention five and running status figure three；
The principle assumption diagram of the intelligent defrosting air conditioning system that Fig. 9 provides for the embodiment of the present invention six；
The principle assumption diagram of the intelligent defrosting air conditioning system that Figure 10 provides for the embodiment of the present invention seven；
The principle assumption diagram of the intelligent defrosting air conditioning system that Figure 11 provides for the embodiment of the present invention eight.
In figure：
1：Compressor；2：Solenoid operated four-way valve；3：Outdoor heat exchanger；41：First throttle part；42：Second throttle part；5：
Indoor heat exchanger；61：First control valve；62：Second control valve；63：3rd control valve；7：Fluid reservoir；70：Gaseous coolant is adjusted
Pipeline；71：Liquid refrigerants adjusts pipeline；8：Pressure transducer；9：Temperature sensor；10：Gas side line；11：Gas-liquid separator；
12：Refrigerant heater；13：Stop valve；100：Coolant adjusts bypass branch.
Specific embodiment
In order that the technical problem to be solved, technical scheme and beneficial effect become more apparent, below tie
Close drawings and Examples, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
In order to explain the present invention, it is not intended to limit the present invention.
Embodiment one
Refer to Fig. 1 to Fig. 2, the intelligent defrosting air conditioning system providing for the embodiment of the present invention one.This intelligent defrosting air-conditioning
System includes connecting at least one compressor 1 by pipeline, reversal valve, outdoor heat exchanger 3, first throttle part 41, interior are changed
Refrigerant circulation circuit and the controller (not shown) controlling air conditioning system operation that hot device 5 is formed；In the present embodiment, reversal valve
From solenoid operated four-way valve, certainly also can use two three-way valve to combine and play commutation function, this solenoid operated four-way valve 2 has D pipe
Mouth, the E mouth of pipe, the S mouth of pipe and the C mouth of pipe, wherein, the C mouth of pipe is connected with outdoor heat exchanger 3, and the E mouth of pipe is connected with indoor heat exchanger 5, and D manages
Mouth is connected with the air vent of compressor 1, and the S mouth of pipe is connected with the air entry of compressor 1；Between outdoor heat exchanger 3 and throttle part
Pipeline on be also associated with coolant and adjust bypass branch 100, adjust in this coolant and be sequentially serially connected with by controlling on bypass branch 100
The first control valve 61 and fluid reservoir 7 that device controls, are connected with gaseous coolant on this fluid reservoir 7 and adjust pipeline 70 and liquid refrigerants
Adjust pipeline 71；Wherein, gaseous coolant is adjusted pipeline 70 and is connected with the air entry of compressor 1 by gas side line 10, also with electricity
The S mouth of pipe of magnetic cross valve 2 connects, and this gaseous coolant adjusts pipeline 70 and is provided with the second control valve 62 being controlled by controller；
And liquid refrigerants is adjusted pipeline 71 and is connected with the air entry of compressor 1 by gas side line 10, and sequentially go here and there on this liquid pipeline
It is connected to the second throttle part 42 and the 3rd control valve 63 being controlled by controller；The air vent of compressor 1 and solenoid operated four-way valve 2 it
Between pipeline on be additionally provided with for detecting delivery temperature Tp of compressor 1 and feeding back to the temperature sensor 9 of controller.
The gentle side pipe of liquid lateral line in existing common air-conditioning system for the intelligent defrosting air conditioning system that the present invention provides
Set up coolant between road and adjust bypass branch 100 and corresponding control valve, when air conditioning system runs defrosting mode, cold in system
The traffic direction of matchmaker is identical with during cooling system, and off-premises station blower fan and indoor set blower fan are all out of service, outdoor heat exchanger 3 and room
Interior heat exchanger 5 all can not carry out heat exchange effectively, and coolant carries out defrost when outdoor heat exchanger 3, but coolant can not abundant liquid
Change, controller controls the first control valve 61 to open so that a certain amount of coolant (gaseous state+liquid) enters into storage in fluid reservoir 7；
With persistently carrying out of defrosting process, because indoor set blower fan stops, indoor heat exchanger 5 fills as vaporizer nor by coolant
Point gasification, so, the low pressure Pd of system is more and more lower, and the air conditioning system invented, can be in defrosting at the very start by the
One control valve 61 and the second control valve 62 are opened, and the gaseous coolant in such fluid reservoir 7 just adjusts pipeline 70 by gaseous coolant
Enter in the gas side line 10 of system and the low pressure Pd of system is maintained at certain level, also avoid liquid cold
Matchmaker is flowed out from indoor heat exchanger 5 and is returned in compressor 1 and cause liquid hit phenomenon because the low pressure Pd of system is too low；The opposing party
Face, with the carrying out of defrosting, the delivery temperature Tp meeting more and more higher of compressor 1, reaches when temperature sensor 9 detects this temperature
Or when exceeding the reference temperature value T0 in program that is drawing and being set in advance in controller by experiment, controller is just sent out
Go out instruction to open the 3rd control valve 63, the high temperature in such fluid reservoir 7, high-pressure liquid coolant save through the second throttle part 42
The gaseous coolant becoming low-temp low-pressure after stream cooling, blood pressure lowering enters in compressor 1, and then delivery temperature Tp by compressor 1
Reduce, said process is constantly repeated up to the entirely process of defrosting to be terminated, safety during whole defrosting for the final guarantee system
Stably run.
In summary it can be seen, the intelligent defrosting air conditioning system that the present invention provides ensure that air conditioning system in defrost mode
The low pressure Pd of system is maintained at certain level and refers to accordingly it is possible to be made according to delivery temperature Tp of compressor 1
Order controls corresponding control valve break-make, supplements the corresponding gaseous coolant amount of regulation in real time, accurately to compressor, reaches and is ensureing
While effective defrosting, it is avoided that liquid refrigerant stream returns delivery temperature Tp that compressor 1 causes liquid hit phenomenon and compressor again
The too high and purpose that leads to the system failure, improves the safety of air conditioning system；And, intelligent defrosting air conditioning system knot of the present invention
Structure is simple, easy and simple to handle, with low cost.
In the present embodiment, first throttle part 41 can be from capillary tube, electric expansion valve, heating power expansion valve
Kind；But this is sentenced and is preferred from electric expansion valve, because electric expansion valve is capable of the flow of precise control coolant；Response speed
Faster than heating power expansion valve, the required open degree of defrosting can be reached in time, improve defrosting performance, evaporating temperature is also more steady
Fixed；And suction superheat can be better controled over, adapt to bigger refrigeration scope.
In the present embodiment, the second throttle part 42 can be selected in capillary tube, electric expansion valve, heating power expansion valve
With；But consider from function and cost herein, be preferred from capillary tube.
In the present embodiment, the first control valve 61, the second control valve 62, the 3rd control valve 63 can select electromagnetic valve or electronics
Expansion valve.But consider from cost and function, the first control valve 61, the 3rd control valve 63 select electromagnetic valve preferably, the second control valve
62 are preferred using electric expansion valve.
Refer to Fig. 1 or Fig. 2, the high-pressure liquid tube pipeline being connected with indoor heat exchanger 5 and low pressure gas pipe pipeline also divide
Be not provided with a stop valve 13, so can with Non-follow control open and close valve element to control coolant by with cut-off, for installing and overhauling
Air conditioning system provides convenient.
The present invention also provides the control method of the intelligent defrosting air conditioning system of embodiment one offer, and control method includes following
Step：
(1) controller controls air conditioning system to enter Defrost operation state；Refer to Fig. 1, at this moment, the coolant in system runs
Direction is identical with refrigeration mode, enters outdoor heat exchanger 3 simultaneously from the air vent of compressor 1 high pressure gaseous coolant out
Carry out heat exchange therewith, so that the frost concentrating on outdoor heat exchanger 3 is melted；
(2) refer to Fig. 1, when just having started defrosting, controller controls the first control valve 61 to open, the second control valve 62 dozens
Open, the 3rd control valve 63 is closed, in such outdoor heat exchanger 3, the insufficient part high temperature of liquefaction out, high pressure refrigerant are passed through
Bypass branch 100 flows into fluid reservoir 7 and stores in it, and wherein, the gasification of part coolant adjusts pipeline 70 from gaseous coolant and flows into gas
In side line 10, the coolant quantity in refrigerant circulation circuit is supplemented so that the pressure of the low-pressure side of system keeps one to be scheduled on
Certain level；
(3), during whole defrosting, temperature sensor 9 detects that delivery temperature Tp of compressor 1 simultaneously feeds back to controller
And often through unit interval Δ t duplicate detection set in advance in the program of controller once, that is, temperature sensor 9 is every
Interval time between detecting twice is unit time Δ t；
(4) controller relatively and judges the delivery temperature of the compressor 1 that temperature sensor 9 detects and feeds back in step (3)
Whether Tp is less than reference temperature value T0 set in advance in the program of controller：
If a. delivery temperature Tp of compressor 1 is less than reference temperature value T0, i.e. Tp ＜ T0, then the 3rd control valve 63 keeps closing
Closed state, now liquid refrigerants regulation pipeline 71 is obstructed, does not carry out coolant quantity supply to gas side line 10 and compressor 1 and adjusts fall
Temperature；
If b. delivery temperature Tp of compressor 1 is more than or equal to reference temperature value T0, i.e. Tp >=T0, then controller controls the 3rd
Control valve 63 is opened, and refers to Fig. 2, and now, the liquid refrigerants flowing out in fluid reservoir 7 flows into compressor after the second throttle part
1 return-air side, to reduce delivery temperature Tp of compressor 1；When delivery temperature Tp of compressor 1 is less than reference temperature value T0,
I.e. during Tp ＜ T0, controller controls the 3rd control valve 63 to recover to cut out；
(5) repeat the above steps (3), (4) are terminated up to defrosting process, and controller controls the first control valve 61 to cut out, cold
Matchmaker adjusts bypass branch 100 and is blocked.
Embodiment two
Refer to Fig. 3, the present embodiment is with the difference of embodiment one, fluid reservoir 7 also has additional further by controlling
Device controls, for the refrigerant heater 12 to the coolant heating in fluid reservoir 7.When the gaseous coolant of fluid reservoir 7 is not enough, then
Gaseous coolant adjust pipeline 70 will insufficient pressure, also just cannot be pressurized to gas side line 10 after the second control valve 62 is opened and
The low pressure Pd of lift system.By refrigerant heater 12, the liquid refrigerants in fluid reservoir 7 is gasificated into gaseous coolant to enter
To the low-pressure side of compressor 1, the pressure of low-pressure side is made to be maintained at certain level, thus preventing liquid refrigerants because of the low pressure of system
Pressure Pd is too low and flows out from indoor heat exchanger 5 and returns in compressor 1 and cause liquid hit phenomenon.This refrigerant heater 12 is to select
Electrothermal heater or electromagnetic heater are preferred, and are not only easy to realize, and are also convenient for controlling.And the other structures of the present embodiment and function
Principle is identical with embodiment one, and here is omitted.
Embodiment three
Refer to Fig. 4, the present embodiment is with the difference of embodiment one, gaseous coolant adjusts pipeline 70 tunnel and liquid refrigerants
Adjust and have additional gas-liquid separator 11 on the gas side line 10 between pipeline 71 tunnel.This gas-liquid separator 11 can prevent liquid cold
Matchmaker enters compressor 1 from the return-air side of compressor 1, and only allows gaseous coolant enter in compressor 1, prevents compressor 1 from producing
Liquid hit phenomenon.The security performance making system is lifted further.And the other structures of the present embodiment and principle of work and power and embodiment
One is identical, and here is omitted.
The embodiment of the present invention three provide the control method of intelligent defrosting air conditioning system with identical in embodiment one, herein
Also it is not repeated to describe, simply after the gaseous coolant that fluid reservoir 7 top is flowed out first flows into gas-liquid separator 12, flow to compression again
Machine 1, both can ensure, while effective defrosting, to be avoided that liquid refrigerant stream returns compressor 1 and causes liquid hit phenomenon, its reliability again
Higher.
Example IV
Refer to Fig. 5, the present embodiment is with the difference of embodiment three, fluid reservoir 7 also has additional further by controlling
Device controls, for the refrigerant heater 12 to the coolant heating in fluid reservoir 7.When the gaseous coolant of fluid reservoir 7 is not enough, then
Gaseous coolant adjust pipeline 70 will insufficient pressure, also just cannot be pressurized to gas side line 10 after the second control valve 62 is opened and
Liquid refrigerants in fluid reservoir 7 is gasificated into gaseous coolant by refrigerant heater 12 and enters by the low pressure Pd of lift system
To the low-pressure side of compressor 1, the pressure of low-pressure side is made to be maintained at certain level, thus preventing liquid refrigerants because of the low pressure of system
Pressure Pd is too low and flows out from indoor heat exchanger 5 and returns in compressor 1 and cause liquid hit phenomenon.This refrigerant heater 12 is to select
Electrothermal heater or electromagnetic heater are preferred, and are not only easy to realize, and are also convenient for controlling.And the other structures of the present embodiment and function
Principle is identical with embodiment three, and here is omitted.
Embodiment five
Refer to Fig. 6, the intelligent defrosting air conditioning system that the present embodiment provides is with the difference in embodiment one：And gas side
It is additionally provided with for by the low pressure Pd of detecting system and feed back to controller at the air entry of compressor 1 on pipe arrangement 10
Pressure transducer 8；Remaining structure is all identical with the structure in embodiment one.
The present invention also provides the control method of the intelligent defrosting air conditioning system of embodiment one offer, and control method includes following
Step：
(1) controller controls air conditioning system to enter Defrost operation state；Refer to Fig. 6, at this moment, the coolant in system runs
Direction is identical with refrigeration mode, enters outdoor heat exchanger 3 simultaneously from the air vent of compressor 1 high pressure gaseous coolant out
Carry out heat exchange therewith, so that the frost concentrating on outdoor heat exchanger 3 is melted；
(2), when and just having started defrosting, the first control valve 61 is opened, the second control valve 62 is closed, the 3rd control for controller control
Valve 63 processed cuts out, and refers to Fig. 7, and in such outdoor heat exchanger 3, the insufficient part high temperature of liquefaction out, high pressure refrigerant are passed through
Bypass branch 100 flows into fluid reservoir 7 and stores in it；
(3), during whole defrosting, pressure transducer 8 detects that the low pressure Pd of air conditioning system simultaneously feeds back to controller
And often pass through in the program of controller unit interval Δ t duplicate detection set in advance once that is to say, that pressure transducer 8
Interval time between every detection twice is unit time Δ t；Equally, temperature sensor 9 detects delivery temperature Tp of compressor 1
And feed back to controller and often pass through in the program of controller unit interval Δ t duplicate detection set in advance once, that is,
Interval time between the every detection twice of temperature sensor 9 is unit time Δ t；
(4) controller relatively and judges the system low-voltage pressure that in step (3), pressure transducer 8 detects each time and feeds back
Whether Pd is more than base pressure force value P0 set in advance in the program of controller：
If a. low pressure Pd be more than base pressure force value P0, i.e. Pd ＞ P0, then the second control valve 62 remain off, this
Gaseous coolant amount is supplemented in Shi Buxiang gas side line 10；
If b. low pressure Pd is less than or equal to base pressure force value P0, i.e. Pd≤P0, then controller control the second control valve 62
Open, refer to Fig. 8, now, the gaseous coolant flowing out in fluid reservoir 7 flows into gas side line 10 and compressor 1, to increase system
Low pressure Pd；When the low pressure Pd of system is more than base pressure force value P0, that is, during Pd ＞ P0, controller controls the second control
Valve 62 processed recovers to cut out；
(5) controller relatively and judges the delivery temperature of the compressor 1 that temperature sensor 9 detects and feeds back in step (3)
Whether Tp is less than reference temperature value T0 set in advance in the program of controller：
If a. delivery temperature Tp of compressor 1 is less than reference temperature value T0, i.e. Tp ＜ T0, then the 3rd control valve 63 keeps closing
Closed state, now liquid refrigerants regulation pipeline 71 is obstructed, does not carry out coolant quantity supply to gas side line 10 and compressor 1 and adjusts fall
Temperature；
If b. delivery temperature Tp of compressor 1 is more than or equal to reference temperature value T0, i.e. Tp >=T0, then controller controls the 3rd
Control valve 63 is opened, and refers to Fig. 3, and now, the liquid refrigerants flowing out in fluid reservoir 7 flows into compressor after the second throttle part
1 return-air side, to reduce delivery temperature Tp of compressor 1；When delivery temperature Tp of compressor 1 is less than reference temperature value T0,
I.e. during Tp ＜ T0, controller controls the 3rd control valve 63 to recover to cut out；
(6) repeat the above steps (3), (4), (5) are terminated up to defrosting process, and controller controls the first control valve 61 to close
Close, coolant adjusts bypass branch 100 and is blocked.
Liquid lateral line in existing common air-conditioning system for the intelligent defrosting air conditioning system that the embodiment of the present invention five provides
Set up coolant between gentle lateral line and adjust bypass branch 100 and corresponding control valve, when air conditioning system runs defrosting mode,
In system, the traffic direction of coolant is identical with during cooling system, and off-premises station blower fan and indoor set blower fan are all out of service, and outdoor is changed
Hot device 3 and indoor heat exchanger 5 all can not carry out heat exchange effectively, and coolant carries out defrost when outdoor heat exchanger 3, but coolant is not
Can fully liquefy, controller controls the first control valve 61 to open so that a certain amount of coolant (gaseous state+liquid) enters into fluid reservoir
Storage in 7；With defrosting persistently the carrying out of process, because indoor set blower fan stops, indoor heat exchanger 5 as vaporizer nor
Coolant is fully gasified, so, the low pressure Pd of system is more and more lower, and the air conditioning system invented, can open in defrosting one
Begin just to open the first control valve 61 and the second control valve 62, when the low pressure Pd that pressure transducer 8 detects system drops to
Less than or equal to when by testing base pressure force value P0 in program that is drawing and being set in advance in controller, controller is just
Instruction can be sent close the second control valve 62, the gaseous coolant in such fluid reservoir 7 just adjusts pipeline 70 by gaseous coolant
Enter in the gas side line 10 of system and the low pressure Pd of system is improved, also avoid liquid refrigerants low because of system
Pressure pressure Pd is too low and flows out from indoor heat exchanger 5 and returns in compressor 1 and cause liquid hit phenomenon；On the other hand, with defrosting
Carrying out, delivery temperature Tp of compressor 1 can more and more higher, pass through when temperature sensor 9 detects this temperature and meets or exceeds
When reference temperature value T0 in program that is that experiment draws and being set in advance in controller, controller is issued by instructing the
Three control valves 63 are opened, and the high temperature in such fluid reservoir 7, high-pressure liquid coolant are lowered the temperature, dropped through the second throttle part 42 throttling
Enter into after pressure in compressor 1, and then delivery temperature Tp of compressor 1 is reduced, said process is constantly repeated up to entirely remove
White process terminates, operation with security and stability during whole defrosting for the final guarantee system.
In summary it can be seen, the intelligent defrosting air conditioning system that the embodiment of the present invention five provides can be by controller according to being
System in defrost mode system low pressure Pd with reference to compressor 1 delivery temperature Tp to make corresponding instruction control corresponding
Control valve break-make, in real time, accurately supplement to system low-voltage side and compressor and adjust corresponding coolant quantity, reach and ensureing
While effectively defrosting, it is avoided that liquid refrigerant stream returns delivery temperature Tp that compressor 1 causes liquid hit phenomenon or compressor again
Too high purpose, improves the safety of air conditioning system；And, intelligent defrosting air conditioning system structure of the present invention is simple, operation letter
Just, with low cost.
Embodiment six
Refer to Fig. 9, the present embodiment is with the difference of embodiment five：Also have additional further by described on fluid reservoir 7
Controller controls, for the refrigerant heater 12 to the coolant heating in fluid reservoir 7.When the gaseous coolant of fluid reservoir 7 is not enough,
The pressure of so gaseous coolant regulation pipeline 70 will be not enough, also just cannot increase to gas side line after the second control valve 62 is opened
Press and the low pressure Pd of lift system, at this moment controller can startup be cold in time according to the pressure condition of pressure transducer feedback
Matchmaker's heater 12 heats to fluid reservoir 7, makes storage liquid refrigerants endothermic gasification in the inner adjust pipeline to strengthen gaseous coolant
Pressure in 70, thus preferably lift the low pressure Pd in gas side line, it is to avoid it is less than base pressure force value P0.And at this
Refrigerant heater 12 being preferred from electric heater, be not only easy to realize, be also convenient for controlling.And the other structures of the present embodiment
Identical with embodiment five with principle of work and power, here is omitted.
Basic phase in the control method of intelligent defrosting air conditioning system of embodiment six and embodiment five that the present invention provides
Same, there is some difference to be just to increase a control process to refrigerant heater, specially：
In the step (4) of the control method of the offer of the embodiment of the present invention five,
If a. low pressure Pd be more than base pressure force value P0, i.e. Pd ＞ P0, then refrigerant heater 12 remain powered off state, this
When refrigerant heater 12 do not work, coolant in fluid reservoir 7 is not heated；
If b. low pressure Pd is less than or equal to base pressure force value P0, i.e. Pd≤P0, then work is opened in refrigerant heater 12 energising
Make to coolant heating in fluid reservoir 7 so as to gasifying and increasing pressure, when the low pressure Pd of system is more than base pressure force value P0
When, that is, during Pd ＞ P0, refrigerant heater 12 recovers off-position；
In sum, the control method of the intelligent defrosting air conditioning system that the embodiment of the present invention six provides controls accurate, operation
Easy, both can ensure, while effective defrosting, to be avoided that liquid refrigerant stream returns compressor 1 and causes liquid hit phenomenon, thus carrying again
The high safety of air conditioning system.
Embodiment seven
Refer to Figure 10, the present embodiment is with the difference of embodiment five：It is cold with liquid that gaseous coolant adjusts pipeline 70 tunnel
Gas-liquid separator 11 is had additional on gas side line 10 between matchmaker's regulation pipeline 71 tunnel.This gas-liquid separator 11 can prevent liquid
Coolant enters compressor 1 from the return-air side of compressor 1, and only allows gaseous coolant enter in compressor 1, prevents compressor 1 from producing
Raw liquid hit phenomenon.The security performance making system is lifted further.And the other structures of the present embodiment and principle of work and power and enforcement
Example five is identical, and here is omitted.
The present invention provide the control method of intelligent defrosting air conditioning system of embodiment seven with identical in embodiment five, this
Place is also not repeated to describe, and simply flows to pressure again after the gaseous coolant that fluid reservoir 7 top is flowed out first flows into gas-liquid separator 12
Contracting machine 1.
Embodiment eight
Refer to Figure 10, the present embodiment is with the difference of embodiment six：It is cold with liquid that gaseous coolant adjusts pipeline 70 tunnel
Gas-liquid separator 11 is had additional on gas side line 10 between matchmaker's regulation pipeline 71 tunnel.This gas-liquid separator 11 can prevent liquid
Coolant enters compressor 1 from the return-air side of compressor 1, and only allows gaseous coolant enter in compressor 1, prevents compressor 1 from producing
Raw liquid hit phenomenon.The security performance making system is lifted further.And the other structures of the present embodiment and principle of work and power and enforcement
Example six is identical, and here is omitted.
The present invention provide the control method of intelligent defrosting air conditioning system of embodiment eight with identical in embodiment six, this
Place is also not repeated to describe, and simply flows to pressure again after the gaseous coolant that fluid reservoir 7 top is flowed out first flows into gas-liquid separator 12
Contracting machine 1.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of intelligent defrosting air conditioning system, including by pipeline connect at least one compressor, reversal valve, outdoor heat exchanger,
Refrigerant circulation circuit and the controller controlling air conditioning system operation that one throttle part, indoor heat exchanger are formed；It is characterized in that：
Pipeline between described outdoor heat exchanger and described first throttle part is also associated with a coolant and adjusts bypass branch, described
Coolant adjusts and is sequentially serially connected with first control valve being controlled by described controller and a fluid reservoir, described liquid storage on bypass branch
One gaseous coolant is connected with tank and adjusts pipeline and liquid refrigerants regulation pipeline；
Described gaseous coolant is adjusted pipeline and is connected with the air entry of described compressor by gas side line, and this gaseous coolant is adjusted
Pipeline is provided with second control valve being controlled by described controller；
Described liquid refrigerants is adjusted pipeline and is connected with the air entry of described compressor by gas side line, and suitable on this liquid pipeline
Secondary it is serially connected with one second throttle part and the 3rd control valve being controlled by described controller；
Pipeline between the air vent of described compressor and described reversal valve is provided with one for detecting the delivery temperature of compressor
And feed back to the temperature sensor of controller；
When air conditioning system runs defrosting mode, defrosting is passed through at the very start by described first control valve and described second control valve
Open, the gaseous coolant in described fluid reservoir adjusts pipeline by described gaseous coolant and enters in described gas side line；With
The carrying out of defrosting, when the delivery temperature that described temperature sensor detects described compressor meet or exceed be set in advance in described
During reference temperature value in the program of controller, described controller sends instruction and opens described 3rd control valve, described liquid storage
High temperature in tank, high-pressure liquid coolant become the gaseous state of low-temp low-pressure after described second throttle part throttling cooling, blood pressure lowering
Coolant enters in described compressor, and the delivery temperature of described compressor is reduced.
2. intelligent defrosting air conditioning system as claimed in claim 1 it is characterised in that：It is additionally provided with by described control on described fluid reservoir
Device processed controls, for the refrigerant heater to the coolant heating in described fluid reservoir.
3. intelligent defrosting air conditioning system as claimed in claim 2 it is characterised in that：It is connected with one with described compressor air suction mouth
Gas-liquid separator.
4. intelligent defrosting air conditioning system as claimed in claim 2 or claim 3 it is characterised in that：Near described on described gas side line
It is additionally provided with a pressure transducer, the low pressure for detecting system simultaneously feeds back to controller at the air entry of compressor.
5. intelligent defrosting air conditioning system as claimed in claim 4 it is characterised in that：Described reversal valve is solenoid operated four-way valve, institute
The D mouth of pipe, the E mouth of pipe, the S mouth of pipe and the C mouth of pipe of stating solenoid operated four-way valve are connected respectively the air vent of described compressor, described interior
Heat exchanger, the air entry of described compressor, described outdoor heat exchanger.
6. intelligent defrosting air conditioning system as claimed in claim 4 it is characterised in that：Described first throttle part and/or described
Second throttle part is one of capillary tube, electric expansion valve, heating power expansion valve.
7. intelligent defrosting air conditioning system as claimed in claim 4 it is characterised in that：Described first control valve, the second control valve
It is electromagnetic valve or electric expansion valve with the 3rd control valve.
8. intelligent defrosting air conditioning system as claimed in claim 1 control method it is characterised in that：Described control method includes
Following steps：
(1) start air conditioning system and enter defrosting mode operation；
(2) described first control valve is opened, described second control valve is opened, described 3rd control valve is closed for described controller control
Close；
(3) described temperature sensor detects the delivery temperature of described compressor and feeds back to described controller, and aforementioned activities are every
In described director demon, interval time set in advance is repeated once；
(4) described controller relatively and judges whether compressor exhaust temperature described in step (3) is less than the journey of described controller
Reference temperature value set in advance in sequence：
A. if so, then described 3rd control valve remains off；
B. if it is not, then described controller control described 3rd control valve to open, the liquid refrigerants flowing out in described fluid reservoir is through the
The return-air side of described compressor is flowed into, to reduce the delivery temperature of described compressor after two throttle parts；When described compressor
When delivery temperature is less than described reference temperature value, described controller controls described 3rd control valve to cut out；
(5) repeat the above steps (3), (4) are terminated up to defrosting process, and described controller controls described first control valve to cut out.
9. intelligent defrosting air conditioning system as claimed in claim 5 control method it is characterised in that：
(1) open air conditioning system and enter defrosting mode operation；
(2) described controller controls described first control valve to open, described second control valve is closed, described 3rd control valve is closed
Close, part coolant flows in described fluid reservoir；
(3) described pressure transducer detects the low pressure of air conditioning system and feeds back to described controller, and aforementioned activities often warp
Spend interval time set in advance in the program of described controller to be repeated once；Described temperature sensor detects described compressor
Delivery temperature simultaneously feeds back to described controller, and aforementioned activities are often in the program of described controller during interval set in advance
Between be repeated once；
(4) described controller relatively and judges whether low pressure described in step (3) is pre- more than in the program of described controller
The base pressure force value first setting：
A. if so, then described second control valve remains off；
B. if it is not, then described controller control described second control valve to open, the gaseous coolant flowing out in described fluid reservoir flows into
Described gas side line and described compressor, increase the low pressure of system；When the low pressure of system is more than described reference pressure
During value, described controller controls described second control valve to cut out；
(5) described controller relatively and judges the compressor exhaust temperature that described in step (3), temperature sensor detects and feeds back
Whether less than reference temperature value set in advance in the program of described controller：
A. if so, then described 3rd control valve remains off；
B. if it is not, then described controller control described 3rd control valve to open, the liquid refrigerants flowing out in described fluid reservoir is through the
The return-air side of described compressor is flowed into, to reduce the delivery temperature of described compressor after two throttle parts；When described compressor
When delivery temperature is less than described reference temperature value, described controller controls described 3rd control valve to cut out；
(6) repeat the above steps (3), (4), (5) are terminated up to defrosting process, and described controller controls described first control valve to close
Close.
10. control method as claimed in claim 9 it is characterised in that：Also include in described step (4)：
If a. described low pressure is more than described base pressure force value, described refrigerant heater remain powered off state and not to described
Coolant heating in fluid reservoir；
If b. described low pressure is less than or equal to described base pressure force value, described refrigerant heater energising opens work to described
Coolant heating in fluid reservoir, when the described low pressure of system is more than described base pressure force value, described refrigerant heater is extensive
Multiple off-position.
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| CN201310327242.7A CN104344618B (en) | 2013-07-30 | 2013-07-30 | Intelligent defrosting air conditioning system and control method thereof |
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| CN201310327242.7A CN104344618B (en) | 2013-07-30 | 2013-07-30 | Intelligent defrosting air conditioning system and control method thereof |
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| CN104964343B (en) * | 2015-06-12 | 2018-09-11 | 广东美的暖通设备有限公司 | A kind of device and method improving compressor operating reliability |
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| CN107576104A (en) * | 2017-09-26 | 2018-01-12 | 青岛海尔空调电子有限公司 | Refrigerant regulating system and air conditioner for air conditioner |
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| CN110094904B (en) * | 2019-03-18 | 2020-05-19 | 珠海格力电器股份有限公司 | Defrosting system, control method and device and refrigeration equipment |
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| CN110736217B (en) * | 2019-09-27 | 2021-11-23 | 青岛海尔空调器有限总公司 | Control method and control device for defrosting of air conditioner and air conditioner |
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| CN111503925B (en) * | 2020-04-30 | 2021-12-14 | 中车青岛四方车辆研究所有限公司 | Air conditioner and defrosting method thereof |
| CN112815398B (en) * | 2021-01-18 | 2022-01-04 | 珠海格力电器股份有限公司 | Air conditioner and control method thereof |
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| CN113587262B (en) * | 2021-07-26 | 2022-07-08 | 珠海格力电器股份有限公司 | Outdoor unit, air conditioning system and control method thereof |
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| CN114279110B (en) * | 2022-03-01 | 2022-05-20 | 浙江乾丰智能科技有限公司 | Intelligent defrosting device and method for air energy water heater |
| CN114838536B (en) * | 2022-04-28 | 2024-07-02 | 海信冰箱有限公司 | Refrigerator and defrosting control method thereof |
| CN115717787B (en) * | 2022-11-09 | 2024-07-16 | 珠海格力电器股份有限公司 | Air conditioner control method and device and air conditioner |
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