CN104344618A - 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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- CN104344618A CN104344618A CN201310327242.7A CN201310327242A CN104344618A CN 104344618 A CN104344618 A CN 104344618A CN 201310327242 A CN201310327242 A CN 201310327242A CN 104344618 A CN104344618 A CN 104344618A
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- control valve
- conditioning system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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- 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 particularly, relate to a kind of intelligent defrosting air-conditioning system and control method thereof.
Background technology
When air-conditioning system runs heating mode; outdoor temperature is general all lower; and outdoor heat exchanger also needs to absorb heat; at this moment outdoor unit heat exchanger body temperature can drop to less than 0 DEG C; moisture around will soon condense into frost and accumulate on heat exchangers; if do not defrost; off-premises station is probably blocked by ice cube; have a strong impact on heat exchanger radiating efficiency and effect; if ice cube is tied thicker and thicker; even there will be situation about cannot dispel the heat, finally cause the refrigerant in off-premises station to evaporate, such that system pressure is too low can jump low-voltage variation and shut down.
Existing air-conditioning itself, substantially all with the function of outdoor defrosting, reaches the standard of setting when temperature, time, automatically will run defrosting mode to solve the problem of frosting.And when system cloud gray model defrosting mode, the direct transformation of ownership heat of air-conditioning system is refrigeration mode, off-premises station blower fan and indoor set blower fan all out of service, heat exchanger effectively can not carry out heat exchange, easily cause liquid refrigerants to flow back into compressor, cause liquid hit phenomenon and damage service life of subtracting air-conditioning system or cause potential safety hazard.
Summary of the invention
The object of the present invention is to provide a kind of structure simple, control intelligent defrosting air-conditioning system accurate, easy and simple to handle, with low cost and control method thereof, be intended to overcome prior art and know deficiency, ensure that air-conditioning system is while effectively defrosting, liquid refrigerant stream can be avoided again to return compressor and to cause liquid hammer, thus improve the security of air-conditioning system.
For achieving the above object, the technical solution used in the present invention is: provide a kind of intelligent defrosting air-conditioning system, comprises and connects at least one compressor, reversal valve, outdoor heat exchanger, first throttle parts, the refrigerant circulation circuit of indoor heat exchanger formation and the controller of control air-conditioning system operation by pipeline;
Pipeline between described outdoor heat exchanger and described throttle part is also connected with a refrigerant and regulates bypass branch, described refrigerant regulates on bypass branch and is serially connected with the first control valve controlled by described controller and a fluid reservoir in turn, described fluid reservoir is connected with a gaseous coolant and regulates pipeline and a liquid refrigerants to regulate pipeline;
Described gaseous coolant regulates pipeline to be connected with the air entry of described compressor by gas side line, and this gaseous coolant regulates pipeline to be provided with second control valve controlled by described controller;
Described liquid refrigerants regulates pipeline to be connected with the air entry of described compressor by gas side line, and this liquid pipeline is serially connected with in turn a second section stream unit and the 3rd control valve controlled by described controller;
Pipeline between the exhaust outlet of described compressor and described reversal valve is provided with one for detecting the delivery temperature of compressor and feeding back to the temperature sensor of controller.
Further, described fluid reservoir is also provided with is controlled by described controller, for the refrigerant heater of the refrigerant heating in described fluid reservoir.
Further, a gas-liquid separator is connected with described compressor air suction mouth.
Further, described gas side line is also provided with one near the air entry place of described compressor for the low pressure of detection system is fed back to the pressure sensor of controller.
Preferably, described reversal valve is solenoid operated four-way valve, and the D mouth of pipe of described solenoid operated four-way valve, the E mouth of pipe, the S mouth of pipe and the C mouth of pipe are connected respectively the exhaust outlet of described compressor, described indoor heat exchanger, the air entry of described compressor, described outdoor heat exchanger.
Alternatively, described first throttle parts and/or described second section stream unit are the one in capillary, electric expansion valve, heating power expansion valve.
Alternatively, described first control valve and/or described second control valve and/or described 3rd control valve are magnetic valve or electric expansion valve.
The beneficial effect of intelligent defrosting air-conditioning system provided by the invention is: set up refrigerant between the gentle lateral line of liquid lateral line of intelligent defrosting air-conditioning system of the present invention in existing common air-conditioning system and supplement pipeline and corresponding control valve, corresponding instruction can be made by controller according to system compressor exhaust temperature in defrost mode and/or low pressure and control corresponding control valve break-make, in real time, the refrigerant of corresponding state is supplemented accurately to system low-voltage side, reach and ensureing while effectively defrosting, liquid refrigerant stream can be avoided again to return the object that compressor causes liquid hit phenomenon, thus improve the security of air-conditioning system, 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, and 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 is closed in described controller control;
(3) described temperature sensor detects the delivery temperature of described compressor and feeds back to described controller, and the interval time that aforementioned activities often presets in the program of described controller repeats once;
(4) described controller relatively and temperature sensor described in determining step (3) to detect and whether the compressor exhaust temperature fed back is less than the reference temperature value preset in the program of described controller:
A. if so, then described 3rd control valve keeps closed condition;
B. if not, then described 3rd control valve of described controller control is opened, and the liquid refrigerants flowed out in described fluid reservoir flows into the return-air side of described compressor after the second throttling arrangement, to reduce the delivery temperature of described compressor; When the delivery temperature of described compressor is less than described reference temperature value, described controller controls described 3rd control valve and cuts out;
(5) repeat above-mentioned steps (3), (4) until defrost process terminates, described controller controls described first control valve and cuts out.
For achieving the above object, the present invention also provides the control method of above-mentioned intelligent defrosting air-conditioning system, and described control method comprises the following steps:
(1) open air-conditioning system and enter defrosting mode operation;
(2) described first control valve of described controller control is opened, described second control valve is closed, described 3rd control valve is closed, and part refrigerant flows in described fluid reservoir;
(3) described pressure sensor detects the low pressure of air-conditioning system and feeds back to described controller, and the interval time that aforementioned activities often presets in the program of described controller repeats once; Described temperature sensor detects the delivery temperature of described compressor and feeds back to described controller, and the interval time that aforementioned activities often presets in the program of described controller repeats once;
(4) described controller relatively and pressure sensor described in determining step (3) to detect and whether the system low-voltage pressure fed back is greater than the base pressure force value preset in the program of described controller:
A. if so, then described second control valve keeps closed condition;
B. if not, then described second control valve of described controller control is opened, and the gaseous coolant flowed out in described fluid reservoir flows into described gas side line and described compressor, increases the low pressure of system; When the low pressure of system is greater than described base pressure force value, described controller controls described second control valve and cuts out;
(5) described controller relatively and temperature sensor described in determining step (3) to detect and whether the compressor exhaust temperature fed back is less than the reference temperature value preset in the program of described controller:
A. if so, then described 3rd control valve keeps closed condition;
B. if not, then described 3rd control valve of described controller control is opened, and the liquid refrigerants flowed out in described fluid reservoir flows into the return-air side of described compressor after the second throttling arrangement, to reduce the delivery temperature of described compressor; When the delivery temperature of described compressor is less than described reference temperature value, described controller controls described 3rd control valve and cuts out;
(6) repeat above-mentioned steps (3), (4), (5) until defrost process terminates, described controller controls described first control valve and cuts out.
Further, also comprise in described step (4):
If a. described low pressure is greater than described base pressure force value, then described refrigerant heater keeps off-position and does not heat refrigerant in described fluid reservoir;
If b. described low pressure is less than or equal to described base pressure force value, then described refrigerant heater energising unlatching work is to the refrigerant heating in described fluid reservoir, when the described low pressure of system is greater than described base pressure force value, described refrigerant heater recovers off-position.
The control method of intelligent defrosting air-conditioning system provided by the invention control accurate, easy and simple to handle, both can ensure, while effective defrosting, liquid refrigerant stream can be avoided again to return compressor and cause liquid hit phenomenon, improve the security of air-conditioning system.
Accompanying drawing explanation
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 mono-;
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 bis-;
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 mono-;
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 bis-;
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 tri-;
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 valve; 42: second section parts; 5: indoor heat exchanger; 61: the first control valves; 62: the second control valves; 63: the three control valves; 7: fluid reservoir; 70: gaseous coolant regulates pipeline; 71: liquid refrigerants regulates pipeline; 8: pressure sensor; 9: temperature sensor; 10: gas side line; 11: gas-liquid separator; 12: refrigerant heater; 13: stop valve; 100: refrigerant regulates bypass branch.
Detailed description of the invention
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiment one
Referring to Fig. 1 to Fig. 2, is the intelligent defrosting air-conditioning system that the embodiment of the present invention one provides.This intelligent defrosting air-conditioning system comprises and connects at least one compressor 1, reversal valve, outdoor heat exchanger 3, first throttle parts 41, the refrigerant circulation circuit of indoor heat exchanger 5 formation and the controller (not shown) of control air-conditioning system operation by pipeline; In this example, solenoid operated four-way valve selected by reversal valve, certainly also can combine with two triple valves and play commutation function, this solenoid operated four-way valve 2 has the D mouth of pipe, 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, the D mouth of pipe is connected with the exhaust outlet of compressor 1, and the S mouth of pipe is connected with the air entry of compressor 1; Pipeline between outdoor heat exchanger 3 and throttle part is also connected with refrigerant and regulates bypass branch 100, regulate on bypass branch 100 at this refrigerant and be serially connected with the first control valve 61 and fluid reservoir 7 that are controlled by controller in turn, this fluid reservoir 7 is connected with gaseous coolant and regulates pipeline 70 and liquid refrigerants to regulate pipeline 71; Wherein, gaseous coolant regulates pipeline 70 to be connected with the air entry of compressor 1 by gas side line 10, is also connected with the S mouth of pipe of solenoid operated four-way valve 2, and this gaseous coolant regulates pipeline 70 to be provided with the second control valve 62 controlled by controller; And liquid refrigerants regulates pipeline 71 to be connected with the air entry of compressor 1 by gas side line 10, and the 3rd control valve 63 this liquid pipeline being serially connected with in turn second section stream unit 42 and being controlled by controller; Pipeline between the exhaust outlet of compressor 1 and solenoid operated four-way valve 2 is also provided with the delivery temperature Tp for detecting compressor 1 and feeds back to the temperature sensor 9 of controller.
Set up refrigerant between the gentle lateral line of liquid lateral line of intelligent defrosting air-conditioning system provided by the invention in existing common air-conditioning system and regulate bypass branch 100 and corresponding control valve, when air-conditioning system runs defrosting mode, in system, the traffic direction of refrigerant is identical with during cooling system, off-premises station blower fan and indoor set blower fan all out of service, outdoor heat exchanger 3 and indoor heat exchanger 5 all can not carry out heat exchange effectively, refrigerant carries out defrost when outdoor heat exchanger 3, but refrigerant can not fully liquefy, controller controls the first control valve 61 and opens, a certain amount of refrigerant (gaseous state+liquid state) is entered in fluid reservoir 7 store, along with defrost process continue carry out, because indoor set blower fan stops, refrigerant can not fully gasify as evaporimeter by indoor heat exchanger 5, like this, the low pressure Pd of system is more and more lower, and the air-conditioning system of invention, at the very start the first control valve 61 and the second control valve 62 can be opened in defrosting, gaseous coolant in such fluid reservoir 7 just regulates pipeline 70 enter into the gas side line 10 of system and the low pressure Pd of system is remained on certain level by gaseous coolant, also just avoid liquid refrigerants because of the low pressure Pd of system too low and indoor heat exchanger 5 flow out and get back in compressor 1 and cause liquid hit phenomenon, on the other hand, along with the carrying out of defrosting, the delivery temperature Tp of compressor 1 can be more and more higher, when temperature sensor 9 detect this temperature meet or exceed draw by experiment and be set in advance in the reference temperature value T0 in the program of controller time, controller just sends instruction and is opened by the 3rd control valve 63, high temperature in such fluid reservoir 7, high-pressure liquid refrigerant is lowered the temperature through second section stream unit 42 throttling, the gaseous coolant becoming low-temp low-pressure after step-down enters in compressor 1, and then the delivery temperature Tp of compressor 1 is reduced, said process constantly repeats until whole defrost process terminates, the with security and stability operation of final guarantee system in whole defrost process.
In summary it can be seen, intelligent defrosting air-conditioning system provided by the invention can ensure that the low pressure Pd of air-conditioning system system in defrost mode remains on certain level, and corresponding instruction can be made according to the delivery temperature Tp of compressor 1 and control corresponding control valve break-make, in real time, supplement to compressor accurately and regulate corresponding gaseous coolant amount, reach and ensureing while effectively defrosting, liquid refrigerant stream can be avoided again to return compressor 1 causes the delivery temperature Tp of liquid hit phenomenon and compressor too high and the object causing the system failure, improve the security of air-conditioning system, and intelligent defrosting air-conditioning system structure of the present invention is simple, easy and simple to handle, with low cost.
In the present embodiment, first throttle parts 41 can select the one in capillary, electric expansion valve, heating power expansion valve; But this sentences and selects electric expansion valve to be good, because electric expansion valve accurately can control the flow of refrigerant; Reaction speed is faster than heating power expansion valve, can reach the open degree needed for defrosting in time, and improve defrost performance, evaporating temperature is also more stable; And suction superheat can be controlled better, adapt to larger refrigeration scope.
In the present embodiment, second section stream unit 42 can be selected in capillary, electric expansion valve, heating power expansion valve; But consider from function and cost herein, select capillary to be good.
In the present embodiment, the first control valve 61, second control valve 62, the 3rd control valve 63 can select magnetic valve or electric expansion valve.But consider from cost and function, the first control valve 61, the 3rd control valve 63 select magnetic valve better, and the second control valve 62 adopts electric expansion valve to be good.
Refer to Fig. 1 or Fig. 2, a stop valve 13 is also respectively equipped with on the high-pressure liquid tube pipeline of the connection of indoor heat exchanger 5 and low pressure gas pipe pipeline, like this can Non-follow control open and close spool control refrigerant by with cut-off, for install and maintenance air-conditioning system provide convenience.
The control method of the intelligent defrosting air-conditioning system that the present invention also provides embodiment one to provide, control method comprises the following steps:
(1) controller controls air-conditioning system and enters Defrost operation state; Refer to Fig. 1, at this moment, intrasystem refrigerant traffic direction is identical with under refrigeration mode, enters outdoor heat exchanger 3 and carries out heat exchange with it, thus the frost concentrated on outdoor heat exchanger 3 is melted from the exhaust outlet high pressure gaseous refrigerant out of compressor 1;
(2) Fig. 1 is referred to, when just having started to defrost, controller controls that the first control valve 61 is opened, the second control valve 62 close open, the 3rd control valve 63 closes, the part high temperature that in such outdoor heat exchanger 3, liquefaction is out insufficient, high pressure refrigerant flow into fluid reservoir 7 through bypass branch 100 and store in it, wherein, the gasification of part refrigerant regulates pipeline 70 to flow into gas side line 10 from gaseous coolant, coolant quantity in refrigerant circulation circuit is supplemented, makes the pressure of the low-pressure side of system keep one to fix on certain level;
(3) in the process of whole defrosting, temperature sensor 9 detects the delivery temperature Tp of compressor 1 and feeds back to controller and often through the unit interval Δ t duplicate detection that presets in the program of controller once, also namely, the interval time between every twice detection of temperature sensor 9 is unit time Δ t;
(4) controller relatively and in determining step (3) temperature sensor 9 to detect and whether the delivery temperature Tp of the compressor 1 fed back is less than the reference temperature value T0 preset in the program of controller:
If a. the delivery temperature Tp of compressor 1 is less than reference temperature value T0, i.e. Tp < T0, then the 3rd control valve 63 keeps closed condition, and now liquid refrigerants regulates pipeline 71 obstructed, does not carry out coolant quantity supply regulate cooling to gas side line 10 and compressor 1;
If b. the delivery temperature Tp of compressor 1 is more than or equal to reference temperature value T0, i.e. Tp >=T0, then controller control the 3rd control valve 63 is opened, refer to Fig. 2, now, the liquid refrigerants flowed out in fluid reservoir 7 flows into the return-air side of compressor 1 after the second throttling arrangement, to reduce the delivery temperature Tp of compressor 1; When the delivery temperature Tp of compressor 1 is less than reference temperature value T0, namely during Tp < T0, controller controls the 3rd control valve 63 and recovers to cut out;
(5) repeat above-mentioned steps (3), (4) until defrost process terminates, controller controls the first control valve 61 and cuts out, and refrigerant regulates bypass branch 100 to be blocked.
Embodiment two
Refer to Fig. 3, the difference of the present embodiment and embodiment one is, fluid reservoir 7 also has additional further and is controlled by controller, for the refrigerant heater 12 of the refrigerant heating in fluid reservoir 7.When the gaseous coolant of fluid reservoir 7 is not enough, so gaseous coolant regulates pipeline 70 will insufficient pressure, after the second control valve 62 is opened also just cannot to gas side line 10 supercharging the low pressure Pd of elevator system.By refrigerant heater 12, the liquid refrigerants in fluid reservoir 7 is gasificated into the low-pressure side that gaseous coolant enters into compressor 1, make the pressure of low-pressure side remain on certain level, thus prevent liquid refrigerants because of the low pressure Pd of system too low and indoor heat exchanger 5 flow out and get back in compressor 1 and cause liquid hit phenomenon.This refrigerant heater 12 is good to select electrothermal heater or electromagnetic heater, is not only easy to realize, also convenient control.And other 26S Proteasome Structure and Function principle of the present embodiment is identical with embodiment one, repeat no more herein.
Embodiment three
Refer to Fig. 4, the difference of the present embodiment and embodiment one is, gaseous coolant regulates pipeline 70 tunnel and liquid refrigerants to regulate on the gas side line 10 between pipeline 71 tunnel and has additional gas-liquid separator 11.This gas-liquid separator 11 can prevent liquid refrigerants from entering 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 of system is promoted further.And other 26S Proteasome Structure and Function principle of the present embodiment is identical with embodiment one, repeat no more herein.
The control method of the intelligent defrosting air-conditioning system that the embodiment of the present invention three provides and identical in embodiment one, also no longer repeated description herein, compressor 1 is flowed to again after the gaseous coolant just flowed out from fluid reservoir 7 top first flows into gas-liquid separator 12, both can ensure while effectively defrosting, liquid refrigerant stream can be avoided again to return compressor 1 and cause liquid hit phenomenon, its reliability is higher.
Embodiment four
Refer to Fig. 5, the difference of the present embodiment and embodiment three is, fluid reservoir 7 also has additional further and is controlled by controller, for the refrigerant heater 12 of the refrigerant heating in fluid reservoir 7.When the gaseous coolant of fluid reservoir 7 is not enough, so gaseous coolant regulates pipeline 70 will insufficient pressure, after the second control valve 62 is opened also just cannot to gas side line 10 supercharging the low pressure Pd of elevator system, by refrigerant heater 12, the liquid refrigerants in fluid reservoir 7 is gasificated into the low-pressure side that gaseous coolant enters into compressor 1, make the pressure of low-pressure side remain on certain level, thus prevent liquid refrigerants because of the low pressure Pd of system too low and indoor heat exchanger 5 flow out and get back in compressor 1 and cause liquid hit phenomenon.This refrigerant heater 12 is good to select electrothermal heater or electromagnetic heater, is not only easy to realize, also convenient control.And other 26S Proteasome Structure and Function principle of the present embodiment is identical with embodiment three, repeat no more herein.
Embodiment five
Refer to Fig. 6, the difference in the intelligent defrosting air-conditioning system that the present embodiment provides and embodiment one is: and gas side line 10 is also provided with for the low pressure Pd of detection system is fed back to the pressure sensor 8 of controller near the air entry place of compressor 1; All the other structures are all identical with the structure in embodiment one.
The control method of the intelligent defrosting air-conditioning system that the present invention also provides embodiment one to provide, control method comprises the following steps:
(1) controller controls air-conditioning system and enters Defrost operation state; Refer to Fig. 6, at this moment, intrasystem refrigerant traffic direction is identical with under refrigeration mode, enters outdoor heat exchanger 3 and carries out heat exchange with it, thus the frost concentrated on outdoor heat exchanger 3 is melted from the exhaust outlet high pressure gaseous refrigerant out of compressor 1;
(2) when and just having started to defrost, controller controls that the first control valve 61 is opened, the second control valve 62 is closed, the 3rd control valve 63 is closed, refer to Fig. 7, the part high temperature that in such outdoor heat exchanger 3, liquefaction is out insufficient, high pressure refrigerant flow into fluid reservoir 7 through bypass branch 100 and store in it;
(3) in the process of whole defrosting, pressure sensor 8 detects the low pressure Pd of air-conditioning system and feeds back to controller and often through the unit interval Δ t duplicate detection that presets in the program of controller once, the interval time that is between every twice detection of pressure sensor 8 is unit time Δ t; Equally, temperature sensor 9 detects the delivery temperature Tp of compressor 1 and feeds back to controller and often through the unit interval Δ t duplicate detection that presets in the program of controller once, also namely, the interval time between every twice detection of temperature sensor 9 is unit time Δ t;
(4) controller relatively and in determining step (3) pressure sensor 8 to detect each time and whether the system low-voltage pressure P d fed back is greater than the base pressure force value P0 preset in the program of controller:
If a. low pressure Pd is greater than base pressure force value P0, i.e. Pd > P0, then the second control valve 62 keeps closed condition, now in gas side line 10, does not supplement gaseous coolant amount;
If b. low pressure Pd is less than or equal to base pressure force value P0, i.e. Pd≤P0, then controller controls the second control valve 62 and opens, and refers to Fig. 8, and now, the gaseous coolant flowed out in fluid reservoir 7 flows into gas side line 10 and compressor 1, to increase the low pressure Pd of system; When the low pressure Pd of system is greater than base pressure force value P0, namely during Pd > P0, controller controls the second control valve 62 and recovers to cut out;
(5) controller relatively and in determining step (3) temperature sensor 9 to detect and whether the delivery temperature Tp of the compressor 1 fed back is less than the reference temperature value T0 preset in the program of controller:
If a. the delivery temperature Tp of compressor 1 is less than reference temperature value T0, i.e. Tp < T0, then the 3rd control valve 63 keeps closed condition, and now liquid refrigerants regulates pipeline 71 obstructed, does not carry out coolant quantity supply regulate cooling to gas side line 10 and compressor 1;
If b. the delivery temperature Tp of compressor 1 is more than or equal to reference temperature value T0, i.e. Tp >=T0, then controller control the 3rd control valve 63 is opened, refer to Fig. 3, now, the liquid refrigerants flowed out in fluid reservoir 7 flows into the return-air side of compressor 1 after the second throttling arrangement, to reduce the delivery temperature Tp of compressor 1; When the delivery temperature Tp of compressor 1 is less than reference temperature value T0, namely during Tp < T0, controller controls the 3rd control valve 63 and recovers to cut out;
(6) repeat above-mentioned steps (3), (4), (5) until defrost process terminates, controller controls the first control valve 61 and cuts out, and refrigerant regulates bypass branch 100 to be blocked.
Set up refrigerant between the gentle lateral line of liquid lateral line of the intelligent defrosting air-conditioning system that the embodiment of the present invention five provides in existing common air-conditioning system and regulate bypass branch 100 and corresponding control valve, when air-conditioning system runs defrosting mode, in system, the traffic direction of refrigerant is identical with during cooling system, off-premises station blower fan and indoor set blower fan all out of service, outdoor heat exchanger 3 and indoor heat exchanger 5 all can not carry out heat exchange effectively, refrigerant carries out defrost when outdoor heat exchanger 3, but refrigerant can not fully liquefy, controller controls the first control valve 61 and opens, a certain amount of refrigerant (gaseous state+liquid state) is entered in fluid reservoir 7 store, along with defrost process continue carry out, because indoor set blower fan stops, refrigerant can not fully gasify as evaporimeter by indoor heat exchanger 5, like this, the low pressure Pd of system is more and more lower, and the air-conditioning system of invention, at the very start the first control valve 61 and the second control valve 62 can be opened in defrosting, when pressure sensor 8 detect the low pressure Pd of system drop to be less than or equal to draw by experiment and be set in advance in the base pressure force value P0 in the program of controller time, controller will send instruction and be opened by the second control valve 62, gaseous coolant in such fluid reservoir 7 just regulates pipeline 70 enter into the gas side line 10 of system and improved by the low pressure Pd of system by gaseous coolant, also just avoid liquid refrigerants because of the low pressure Pd of system too low and indoor heat exchanger 5 flow out and get back in compressor 1 and cause liquid hit phenomenon, on the other hand, along with the carrying out of defrosting, the delivery temperature Tp of compressor 1 can be more and more higher, when temperature sensor 9 detect this temperature meet or exceed draw by experiment and be set in advance in the reference temperature value T0 in the program of controller time, controller just sends instruction and is opened by the 3rd control valve 63, high temperature in such fluid reservoir 7, high-pressure liquid refrigerant is lowered the temperature through second section stream unit 42 throttling, enter in compressor 1 after step-down, and then the delivery temperature Tp of compressor 1 is reduced, said process constantly repeats until whole defrost process terminates, the with security and stability operation of final guarantee system in whole defrost process.
In summary it can be seen, the intelligent defrosting air-conditioning system that the embodiment of the present invention five provides can by controller according to system in defrost mode the low pressure Pd of system make corresponding instruction in conjunction with the delivery temperature Tp of compressor 1 and control corresponding control valve break-make, in real time, the corresponding coolant quantity of adjustment is supplemented to system low-voltage side and compressor accurately, reach and ensureing while effectively defrosting, object liquid refrigerant stream being avoided again to return compressor 1 cause the delivery temperature Tp of liquid hit phenomenon or compressor too high, improves the security of air-conditioning system; And intelligent defrosting air-conditioning system structure of the present invention is simple, easy and simple to handle, with low cost.
Embodiment six
Refer to Fig. 9, the difference of the present embodiment and embodiment five is: fluid reservoir 7 also has additional further controlled by described controller, refrigerant heater 12 for heating to the refrigerant in fluid reservoir 7.When the gaseous coolant of fluid reservoir 7 is not enough, so the pressure of gaseous coolant adjustment pipeline 70 will be not enough, after the second control valve 62 is opened also just cannot to the supercharging of gas side line the low pressure Pd of elevator system, this pressure condition being controller can feed back according to pressure sensor start refrigerant heater 12 pairs of fluid reservoirs 7 in time and heat, make storage liquid refrigerants endothermic gasification in the inner to strengthen the pressure in gaseous coolant adjustment pipeline 70, thus the low pressure Pd promoted better in gas side line, avoid it lower than base pressure force value P0.And the refrigerant heater 12 at this place is good to select electric heater, be not only easy to realize, also convenient control.And other 26S Proteasome Structure and Function principle of the present embodiment is identical with embodiment five, repeat no more herein.
The control method of the intelligent defrosting air-conditioning system of embodiment six provided by the invention and substantially identical in embodiment five, have some difference be exactly increase by the control procedure of refrigerant heater, be specially:
In the step (4) of the control method provided of the embodiment of the present invention five,
If a. low pressure Pd is greater than base pressure force value P0, i.e. Pd > P0, then refrigerant heater 12 keeps off-position, and now refrigerant heater 12 does not work, not to refrigerant heating in fluid reservoir 7;
If b. low pressure Pd is less than or equal to base pressure force value P0, i.e. Pd≤P0, then refrigerant heater 12 is energized unlatching work to refrigerant heating in fluid reservoir 7, be vaporized and increase pressure, when the low pressure Pd of system is greater than base pressure force value P0, namely, 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 control accurate, easy and simple to handle, both can ensure while effective defrosting, liquid refrigerant stream can be avoided again to return compressor 1 and to cause liquid hit phenomenon, thus improve the security of air-conditioning system.
Embodiment seven
Refer to Figure 10, the difference of the present embodiment and embodiment five is: gaseous coolant regulates pipeline 70 tunnel and liquid refrigerants to regulate on the gas side line 10 between pipeline 71 tunnel and has additional gas-liquid separator 11.This gas-liquid separator 11 can prevent liquid refrigerants from entering 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 of system is promoted further.And other 26S Proteasome Structure and Function principle of the present embodiment is identical with embodiment five, repeat no more herein.
The control method of the intelligent defrosting air-conditioning system of embodiment seven provided by the invention and identical in embodiment five, herein also no longer repeated description, flow to compressor 1 after the gaseous coolant just flowed out from fluid reservoir 7 top first flows into gas-liquid separator 12 again.
Embodiment eight
Refer to Figure 10, the difference of the present embodiment and embodiment six is: gaseous coolant regulates pipeline 70 tunnel and liquid refrigerants to regulate on the gas side line 10 between pipeline 71 tunnel and has additional gas-liquid separator 11.This gas-liquid separator 11 can prevent liquid refrigerants from entering 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 of system is promoted further.And other 26S Proteasome Structure and Function principle of the present embodiment is identical with embodiment six, repeat no more herein.
The control method of the intelligent defrosting air-conditioning system of embodiment eight provided by the invention and identical in embodiment six, herein also no longer repeated description, flow to compressor 1 after the gaseous coolant just flowed out from fluid reservoir 7 top first flows into gas-liquid separator 12 again.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an intelligent defrosting air-conditioning system, comprises and connects at least one compressor, reversal valve, outdoor heat exchanger, first throttle parts, the refrigerant circulation circuit of indoor heat exchanger formation and the controller of control air-conditioning system operation by pipeline; It is characterized in that:
Pipeline between described outdoor heat exchanger and described throttle part is also connected with a refrigerant and regulates bypass branch, described refrigerant regulates on bypass branch and is serially connected with the first control valve controlled by described controller and a fluid reservoir in turn, described fluid reservoir is connected with a gaseous coolant and regulates pipeline and a liquid refrigerants to regulate pipeline;
Described gaseous coolant regulates pipeline to be connected with the air entry of described compressor by gas side line, and this gaseous coolant regulates pipeline to be provided with second control valve controlled by described controller;
Described liquid refrigerants regulates pipeline to be connected with the air entry of described compressor by gas side line, and this liquid pipeline is serially connected with in turn a second section stream unit and the 3rd control valve controlled by described controller;
Pipeline between the exhaust outlet of described compressor and described reversal valve is provided with one for detecting the delivery temperature of compressor and feeding back to the temperature sensor of controller.
2. intelligent defrosting air-conditioning system as claimed in claim 1, is characterized in that: described fluid reservoir is also provided with and is controlled by described controller, for the refrigerant heater of the refrigerant heating in described fluid reservoir.
3. intelligent defrosting air-conditioning system as claimed in claim 1 or 2, is characterized in that: be connected with a gas-liquid separator with described compressor air suction mouth.
4. the intelligent defrosting air-conditioning system as described in any one of claims 1 to 3, is characterized in that: described gas side line is also provided with a pressure sensor near the air entry place of described compressor, for detection system low pressure and feed back to controller.
5. intelligent defrosting air-conditioning system as claimed in claim 4, it is characterized in that: 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 the C mouth of pipe are connected respectively the exhaust outlet of described compressor, described indoor heat exchanger, the air entry of described compressor, described outdoor heat exchanger.
6. intelligent defrosting air-conditioning system as claimed in claim 4, is characterized in that: described first throttle parts and/or described second section stream unit are the one in capillary, electric expansion valve, heating power expansion valve.
7. intelligent defrosting air-conditioning system as claimed in claim 4, is characterized in that: described first control valve, the second control valve and the 3rd control valve are magnetic valve or electric expansion valve.
8. the control method of intelligent defrosting air-conditioning system as claimed in claim 1, is characterized in that: 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 is closed in described controller control;
(3) described temperature sensor detects the delivery temperature of described compressor and feeds back to described controller, and the interval time that aforementioned activities often presets in described director demon repeats once;
(4) described controller relatively and determining step (3) described in compressor exhaust temperature whether be less than the reference temperature value preset in the program of described controller:
A. if so, then described 3rd control valve keeps closed condition;
B. if not, then described 3rd control valve of described controller control is opened, and the liquid refrigerants flowed out in described fluid reservoir flows into the return-air side of described compressor after the second throttling arrangement, to reduce the delivery temperature of described compressor; When the delivery temperature of described compressor is less than described reference temperature value, described controller controls described 3rd control valve and cuts out;
(5) repeat above-mentioned steps (3), (4) until defrost process terminates, described controller controls described first control valve and cuts out.
9. the control method of intelligent defrosting air-conditioning system as claimed in claim 5, is characterized in that:
(1) open air-conditioning system and enter defrosting mode operation;
(2) described first control valve of described controller control is opened, described second control valve is closed, described 3rd control valve is closed, and part refrigerant flows in described fluid reservoir;
(3) described pressure sensor detects the low pressure of air-conditioning system and feeds back to described controller, and the interval time that aforementioned activities often presets in the program of described controller repeats once; ; Described temperature sensor detects the delivery temperature of described compressor and feeds back to described controller, and the interval time that aforementioned activities often presets in the program of described controller repeats once;
(4) described controller relatively and determining step (3) described in system low-voltage pressure whether be greater than the base pressure force value preset in the program of described controller:
A. if so, then described second control valve keeps closed condition;
B. if not, then described second control valve of described controller control is opened, and the gaseous coolant flowed out in described fluid reservoir flows into described gas side line and described compressor, increases the low pressure of system; When the low pressure of system is greater than described base pressure force value, described controller controls described second control valve and cuts out;
(5) described controller relatively and temperature sensor described in determining step (3) to detect and whether the compressor exhaust temperature fed back is less than the reference temperature value preset in the program of described controller:
A. if so, then described 3rd control valve keeps closed condition;
B. if not, then described 3rd control valve of described controller control is opened, and the liquid refrigerants flowed out in described fluid reservoir flows into the return-air side of described compressor after the second throttling arrangement, to reduce the delivery temperature of described compressor; When the delivery temperature of described compressor is less than described reference temperature value, described controller controls described 3rd control valve and cuts out;
(6) repeat above-mentioned steps (3), (4), (5) until defrost process terminates, described controller controls described first control valve and cuts out.
10. control method as claimed in claim 9, is characterized in that: described step also comprises in (4):
If a. described low pressure is greater than described base pressure force value, then described refrigerant heater keeps off-position and does not heat refrigerant in described fluid reservoir;
If b. described low pressure is less than or equal to described base pressure force value, then described refrigerant heater energising unlatching work is to the refrigerant heating in described fluid reservoir, when the described low pressure of system is greater than described base pressure force value, described refrigerant heater recovers off-position.
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