CN104896785B - A kind of air injection enthalpy-increasing multi-online air-conditioning system and its control method - Google Patents

A kind of air injection enthalpy-increasing multi-online air-conditioning system and its control method Download PDF

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Publication number
CN104896785B
CN104896785B CN201510251117.1A CN201510251117A CN104896785B CN 104896785 B CN104896785 B CN 104896785B CN 201510251117 A CN201510251117 A CN 201510251117A CN 104896785 B CN104896785 B CN 104896785B
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China
Prior art keywords
air
conditioning
outdoor unit
port
increasing
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CN104896785A (en
Inventor
卜其辉
许永锋
梁伯启
李宏伟
蒋运鹏
吴晓鸿
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Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14Heat exchangers specially adapted for separate outdoor units
    • F24F1/16Arrangement or mounting thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/20Electric components for separate outdoor units
    • F24F1/22Arrangement or mounting thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/89Arrangement or mounting of control or safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/37Capillary tubes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • F24F2110/12Temperature of the outside air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00Control inputs relating to system states
    • F24F2140/20Heat-exchange fluid temperature

Abstract

The present invention relates to steam compression type refrigeration field of air conditioning, more particularly to a kind of air injection enthalpy-increasing multi-online air-conditioning system and its control method.A kind of air injection enthalpy-increasing multi-online air-conditioning system that the present invention is provided makes refrigerant heat absorption evaporation by outdoor unit electronic heating element, the heat of heater element in air-conditioning system is absorbed using the evaporation of refrigerant, simultaneously using the middle pressure gaseous coolant produced after refrigerant heat absorption evaporation, into the middle pressure chamber of air injection enthalpy-increasing compressor, it is achieved thereby that the function of air injection enthalpy-increasing;Meanwhile, control method of the invention adjusts the aperture state of the second electronic throttle part according to the first line entry end and the temperature difference of the port of export, so as to adjust the coolant quantity into first pipeline.Air injection enthalpy-increasing multi-online air-conditioning system simple structure of the invention, control method strong operability disclosure satisfy that the heating performance requirement high under extraneous low temperature environment, both improve system effectiveness, and the purpose of energy-conserving and environment-protective has been reached again.

Description

A kind of air injection enthalpy-increasing multi-online air-conditioning system and its control method
Technical field
The present invention relates to steam compression type refrigeration field of air conditioning, more particularly to a kind of air injection enthalpy-increasing multi-online air-conditioning system and Its control method.
Background technology
Convertible frequency air-conditioner just progressively replaces fixed frequency air conditioner because of advantages such as energy-conservation, peace and quiet.It is continuous with high-power frequency conversion air-conditioning Popularization, the caloric value of the electric elements on its outdoor unit electric-controlled plate is also constantly increasing.The especially high-power device such as electronic control module Part, can send substantial amounts of heat and cause temperature to raise rapidly during work, if radiated not in time, their performance can be caused to drop It is low or even burn, it is therefore desirable to configure heat abstractor, effective radiating is carried out to these electrical equipments.
Meanwhile, in order to lift multi-online air-conditioning system heating effect at low ambient temperatures, more using the side of two-stage compression Formula improves heating capacity, and the compressor with air injection enthalpy-increasing can equally reach raising equivalent to a two-stage compression system The effect of heating effect.When being heated using air injection enthalpy-increasing compressor, fluid into compressor middle pressure chamber is often from being Low pressure stage in system, in order to ensure pure gas that the jet into compressor middle pressure chamber is enthalpy high, with the multi-joint of air injection enthalpy-increasing Air conditioner system will typically obtain the gaseous coolant of intermediate pressure using an economizer, for air injection enthalpy-increasing compressor Gas injection.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of air injection enthalpy-increasing multi-online air-conditioning system and its control method, Heat-generating electronic elements radiating efficiency is poor in solving existing multi-online air-conditioning system, and needs to realize that jet increases by economizer The technical problem of enthalpy.
The technical scheme that the present invention solves above-mentioned technical problem is as follows:A kind of multi-online air-conditioning system with air injection enthalpy-increasing, Indoor apparatus of air conditioner including an air-conditioner outdoor unit and at least two parallel connections, the air-conditioner outdoor unit compresses including air injection enthalpy-increasing Machine, four-way valve, outdoor fan, outdoor air cooling heat exchanger, outdoor unit liquid side stop valve, outdoor unit gas side stop valve and outdoor are electromechanical Sub- heater element,
The air injection enthalpy-increasing compressor includes exhaust outlet, gas returning port and puff prot;
The four-way valve includes exhaust port D, condensation port C, evaporator port E and air-breathing pipe port S, the exhaust end Mouth D connects the exhaust outlet of the compressor;
The outdoor air cooling heat exchanger arrival end connects the four-way valve condensation port C, and the port of export connects the outdoor unit Liquid side stop valve;Outdoor fan is provided with the outdoor air cooling heat exchanger;
The first pipeline is wound with the outdoor unit electronic heating element, the first tube outlet end connects the jet The puff prot of enthalpy-increasing compressor, arrival end connects pipeline between the outdoor air cooling heat exchanger and the outdoor unit liquid side stop valve Arbitrary node, the outdoor unit electronic heating element be used for by the liquid refrigerants in first pipeline carry out heating evaporation into Middle pressure gaseous coolant;
Described outdoor unit gas side stop valve one end connects the evaporator port E of the four-way valve, and the other end passes through institute respectively The indoor apparatus of air conditioner for stating at least two parallel connections connects the outdoor unit liquid side stop valve.
The beneficial effects of the invention are as follows:A kind of air injection enthalpy-increasing multi-online air-conditioning system that the present invention is provided, using refrigerant Evaporate to absorb the heat of heater element in air-conditioning system, while using the middle pressure gaseous coolant produced after refrigerant heat absorption evaporation, Into the middle pressure chamber of air injection enthalpy-increasing compressor, it is achieved thereby that the function of air injection enthalpy-increasing.Air injection enthalpy-increasing multi-connected machine of the invention is empty Adjusting system, simple structure disclosure satisfy that the heating performance requirement high under extraneous low temperature environment, both improve system effectiveness, reach again The purpose of energy-conserving and environment-protective is arrived.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement.
Further, also including gas-liquid separator, the gas-liquid separator arrival end connects the four-way valve air-breathing pipe end Mouth S, the port of export connects the gas returning port of the air injection enthalpy-increasing compressor.
Using having the beneficial effect that for above-mentioned improved technology scheme:Can be cold with liquid by gas coolant using gas-liquid separator Matchmaker is separated, and prevents liquid refrigerants from entering through the air inlet pipe of compressor, and causes showing for liquid refrigerants liquid hazards compressor As so as to improve the functional reliability of this air-conditioner outdoor unit.
Further, including two first indoor apparatus of air conditioner and the second indoor apparatus of air conditioner of parallel connection, first air conditioning chamber Interior machine includes first indoor set heat exchanger and the first indoor set throttle part of series connection, and second indoor apparatus of air conditioner includes series connection The second indoor set heat exchanger and the second indoor set throttle part;First indoor set heat exchanger and second indoor set are changed Hot device one end connects the outdoor unit gas side stop valve respectively, and the other end passes through the first indoor set throttle part and second Room respectively Interior machine throttle part connects the outdoor unit liquid side stop valve.
Further, it is provided with first between the outdoor air cooling heat exchanger port of export and the outdoor unit liquid side stop valve Electronic throttle part;The second electronics is provided between the outdoor air cooling heat exchanger port of export and the outdoor unit electronic heating element Throttle part.
Further, the first electronic throttle part and the second electronic throttle part are respectively capillary, electronic expansion Valve or heating power expansion valve.
Using having the beneficial effect that for above-mentioned improved technology scheme:Capillary or electric expansion valve or heating power expansion valve are equal There is good reducing pressure by regulating flow to act on, wherein, the degree of supercooling control that the aperture of electric expansion valve and heating power expansion valve can be as needed, And capillary low production cost, assemble it is simple and convenient.
Further, the first tube outlet end connects the puff prot of the air injection enthalpy-increasing compressor, described in arrival end Pipeline is any between second electronic throttle part connection the first electronic throttle part and the outdoor unit liquid side stop valve Node.
Further, the air-conditioner outdoor unit also includes controller, the first temperature sensor and second temperature sensor,
First temperature sensor is arranged on the outdoor unit electronic heating element and the second electronic throttle part Between, the first refrigerant temperature for gathering the first line entry end, and first refrigerant temperature is sent to described Controller;
The second temperature sensor is arranged on the outdoor unit electronic heating element and the air injection enthalpy-increasing compressor Between puff prot, the second refrigerant temperature for gathering the first tube outlet end, and second refrigerant temperature is sent To the controller;
The controller input connects first temperature sensor and the second temperature sensor, output end connection The second electronic throttle part, the temperature difference for calculating second refrigerant temperature and the second refrigerant temperature, and according to described The temperature difference generates the control signal for controlling the second electronic throttle part aperture.
Using having the beneficial effect that for above-mentioned improved technology scheme:By the first temperature sensor, second temperature sensor and The cooperation of controller, aperture that can be automatically to the second electronic throttle part is controlled, so as to control to enter the first pipeline Coolant quantity, strengthen the air injection enthalpy-increasing effect of air-conditioning system of the present invention and the radiating effect of raising electronic heating element.
A kind of control method of air injection enthalpy-increasing multi-online air-conditioning system, the control method is comprised the following steps:
Step 1, opens the second electronic throttle part, and a part of refrigerant enters the through the second electronic throttle part One pipeline;
Step 2, gathers first refrigerant temperature at the first line entry end;
Step 3, gathers second refrigerant temperature at the first tube outlet end;
Step 4, calculates the difference of first refrigerant temperature and the second refrigerant temperature, and relatively more described difference is poor with default The size of value, generation control signal is sent to the second electronic throttle part, and the control signal is used to control described second The opening and closing of electronic throttle part.
Further, the step 4 is specially:
Setting preset difference value, the preset difference value includes closing temperature difference threshold and the unlatching of the second electronic throttle part Temperature difference threshold;
The difference of first refrigerant temperature and second refrigerant temperature is calculated, and judges the difference whether less than institute Closing temperature difference threshold is stated, if so, the first control signal for controlling the second electronic throttle part to close then is generated, concurrently Give the second electronic throttle part;If it is not, the second electronic throttle part is then kept for opening, until detecting The difference is less than the closing temperature difference threshold;
After the air injection enthalpy-increasing multi-online air-conditioning system runs one end time, first refrigerant temperature and institute are gathered again The second refrigerant temperature is stated, and calculates the difference of first refrigerant temperature and second refrigerant temperature;Judging the difference is It is no less than the unlatching temperature difference threshold, if so, it is closure state until described then to continue to keep the second electronic throttle part Difference is not less than the unlatching temperature difference threshold;If it is not, then generating the second control for opening the second electronic throttle part Signal, and it is sent to the second electronic throttle part.
Further, the closing temperature difference threshold is 1~2 DEG C;The unlatching temperature difference threshold is 5~6 DEG C.
The beneficial effects of the invention are as follows:Control method of the invention according to the first line entry end and the temperature difference of the port of export, The aperture state of the second electronic throttle part is adjusted, when the temperature difference at the first line entry end and the port of export is larger, then is opened Two electronic throttle parts keep the second electronic throttle part for open mode, increase the coolant quantity in the first pipeline;If the When the temperature difference of one line entry end and the port of export is smaller, then the second electronic throttle part is closed, reduce the refrigerant in the first pipeline Amount, until the temperature difference at the first line entry end and the port of export reaches setting value, then opens the second electronic throttle part.Said process Circulation is carried out, and constantly regulate enters the coolant quantity of first pipeline and the refrigerant temperature of the port of export, so as to reach air injection enthalpy-increasing The effect radiated with electronic heating element, disclosure satisfy that the heating performance requirement high under extraneous low temperature environment, both improve system Efficiency, has reached the purpose of energy-conserving and environment-protective again.
Brief description of the drawings
Fig. 1 is a kind of structure chart of air injection enthalpy-increasing multi-online air-conditioning system of the invention;
Fig. 2 is a kind of flow chart of the control method of air injection enthalpy-increasing multi-online air-conditioning system of the invention;
In accompanying drawing, the list of parts representated by each label is as follows:
1st, air injection enthalpy-increasing compressor, 2, four-way valve, 3, outdoor fan, 4, outdoor air cooling heat exchanger, the 5, first electronic throttle Part, the 6, second electronic throttle part, 7, gas-liquid separator, 8, outdoor unit liquid side stop valve, 9, outdoor unit gas side stop valve, 10th, outdoor unit electronic heating element, the 11, first indoor set heat exchanger, the 12, first indoor set throttle part, the 13, second indoor set Heat exchanger, the 14, second indoor set throttle part, the 15, first pipeline, the 16, first temperature sensor, 17, second temperature sensor.
Specific embodiment
Principle of the invention and feature are described below in conjunction with accompanying drawing, example is served only for explaining the present invention, and It is non-for limiting the scope of the present invention.
As shown in figure 1, be a kind of structure chart of air injection enthalpy-increasing multi-online air-conditioning system of the present embodiment, including an air conditioning chamber Outer machine and two indoor apparatus of air conditioner of parallel connection, in other embodiments, can also include more indoor apparatus of air conditioner.The air-conditioning Outdoor unit includes air injection enthalpy-increasing compressor 1, four-way valve 2, outdoor fan 3, outdoor air cooling heat exchanger 4, the first electronic throttle part 5th, the second electronic throttle part 6, outdoor unit liquid side stop valve 8, outdoor unit gas side stop valve 9 and outdoor unit electronic heating element 10;The outdoor unit electronic heating element 10 for air conditioner outdoor unit system electric control part, including drive compressor frequency conversion mould Electronic component of block, blower fan module and other each parts etc., these electronic components can produce heat when work Amount prevents electronic component high temperature failure, it is necessary to radiated to this partial heat.
The air injection enthalpy-increasing compressor 1 includes exhaust outlet, gas returning port and puff prot;The four-way valve 2 includes exhaust port D, condensation port C, evaporator port E and air-breathing pipe port S, the exhaust of the exhaust port D connections institute air injection enthalpy-increasing compressor 1 Mouthful;The arrival end of outdoor air cooling heat exchanger 4 connects the condensation of the four-way valve 2 port C, and the port of export connects the outdoor unit liquid side Stop valve 8;Outdoor fan 3 is provided with the outdoor air cooling heat exchanger 4.The first electronic throttle part 5 is arranged on described Between the port of export of outdoor air cooling heat exchanger 4 and the outdoor unit liquid side stop valve 8, the second electronic throttle part 6 is arranged on Between the port of export of outdoor air cooling heat exchanger 4 and the outdoor unit electronic heating element 10;Described one end of outdoor unit gas side stop valve 9 The evaporator port E of the four-way valve 2 is connected, the other end is connected by the first indoor apparatus of air conditioner and the second indoor apparatus of air conditioner respectively The outdoor unit liquid side stop valve 8.In the present embodiment, first indoor apparatus of air conditioner includes the first indoor set heat exchanger of series connection 11 and the first indoor set throttle part 12, second indoor apparatus of air conditioner includes the second indoor set heat exchanger 13 and second of series connection Indoor set throttle part 14;First indoor set heat exchanger 11 and described one end of second indoor set heat exchanger 13 connect the room Outer machine gas side stop valve 9, the other end is connected by the first indoor set throttle part 12 and the second indoor set throttle part 14 respectively The outdoor unit liquid side stop valve 8.
In the present embodiment, the first pipeline 15 is wound with the outdoor unit electronic heating element 10, the first pipeline 15 has Multiple bending parts, the port of export of the first pipeline 15 connects the puff prot of the air injection enthalpy-increasing compressor 1, and arrival end connection is described The arbitrary node of pipeline between first electronic throttle part 5 and the outdoor unit liquid side stop valve 8;The second electronic throttle portion The puff prot of part 6, outdoor unit electronic heating element 10, the first pipeline 15 and air injection enthalpy-increasing compressor 1 has connected and composed jet increasing The injection branch road of enthalpy compressor 1, the heat produced by outdoor unit electronic heating element 10, makes to be wrapped in the outdoor unit electronics Refrigerant heat absorption evaporation on heater element 10 in first pipeline 15 presses gaseous coolant to enter the spray of air injection enthalpy-increasing compressor 1 in being formed Gas port, and the evaporation of refrigerant can absorb the heat of the electronic heating element 15 in the first pipeline 15, beneficial to the electronics Heater element 15 radiates.
Preferably, the first temperature sensor 16, second temperature sensor 17 and controller are also included in the embodiment of the present invention (not indicated in figure), first temperature sensor 16 is arranged on the outdoor unit electronic heating element 10 and second electronics Between throttle part 6, the first refrigerant temperature for gathering the arrival end of the first pipeline 15, and by first refrigerant temperature It is sent to the controller;
The second temperature sensor 17 is arranged on the outdoor unit electronic heating element 10 and air injection enthalpy-increasing compression Between the puff prot of machine 1, the second refrigerant temperature for gathering the port of export of the first pipeline 15, and by the second refrigerant temperature Degree is sent to the controller;
The controller input connects first temperature sensor and the second temperature sensor, output end connection The second electronic throttle part 6, the temperature difference for calculating second refrigerant temperature and the second refrigerant temperature, and according to described The temperature difference generates the control signal for controlling the second electronic throttle part (6) aperture.By the first temperature sensor 16, The cooperation of two temperature sensors 17 and controller, aperture that can be automatically to the second electronic throttle part is controlled, so that Control enters the coolant quantity of the first pipeline, strengthens the air injection enthalpy-increasing effect of air-conditioning system of the present invention and improves electronic heating element Radiating effect, specific control process referring to the air injection enthalpy-increasing multi-online air-conditioning system of figure 2 below control method.
In the present embodiment, also including gas-liquid separator 7, the arrival end of the gas-liquid separator 7 connects the air-breathing of four-way valve 2 Pipe port S, the port of export connects the gas returning port of the air injection enthalpy-increasing compressor 1.Using gas-liquid separator can by gas coolant with Liquid refrigerants is separated, and prevents liquid refrigerants from entering through the air inlet pipe of compressor, and causes liquid refrigerants liquid hazards to compress The phenomenon of machine, so as to improve the functional reliability of this air-conditioner outdoor unit.
In the present embodiment, the first electronic throttle part 5 and the second electronic throttle part 6 are respectively heating power expansion valve, In other embodiments, the electronic throttle part 5 can also be capillary or electric expansion valve.Capillary or electronic expansion Valve or heating power expansion valve have good throttling action, wherein, the aperture of electric expansion valve and heating power expansion valve can be according to need The degree of supercooling wanted is controlled, and the low production cost of capillary, assembles simple and convenient.
, it is necessary to illustrate in the present embodiment, exhaust outlet is connected with exhaust port D and should broadly understood here, you can with simultaneously Non- is to be joined directly together, and for example in one embodiment of the invention, oil eliminator is additionally provided between exhaust outlet and exhaust port D (not shown), that is to say, that the exhaust outlet of compressor 1 is indirectly connected to the exhaust port D of four-way valve 2 by oil eliminator 's.Wherein, oil eliminator has been prior art, therefore is not just described in detail here.
A kind of course of work of the multi-online air-conditioning system with air injection enthalpy-increasing of the present embodiment is as follows:
During the air-conditioning system refrigerating operaton, refrigerant is compressed into the gaseous state of HTHP in air injection enthalpy-increasing compressor 1 Refrigerant, into the exhaust port D of four-way valve 2, now four-way valve exhaust port D and condensation port C conductings, the high temperature after compression is high Pressure gaseous coolant enters outdoor air cooling heat exchanger 4 and is exchanged heat, and middle temperature high pressure refrigerant is formed after condensation, by the first electronic throttle The reducing pressure by regulating flow of part 5 is into medium temperature and medium pressure liquid refrigerants;Open the second electronic throttle part 6 and outdoor unit liquid side stop valve 8, one Divide refrigerant to enter the first pipeline by the second electronic throttle part 6, then absorbed heat by outdoor unit electronic heating element 10 and evaporated Into middle pressure gaseous coolant, middle pressure chamber is entered from the jet of air injection enthalpy-increasing compressor 1;Another part refrigerant cuts from outdoor unit liquid side Only valve 8 flow out to the first indoor throttle part 12 and second Room inner side throttle part 14, reducing pressure by regulating flow into low-pressure liquid refrigerant, Again air-conditioning is returned to after the first indoor set heat exchanger 11 and the second indoor set heat exchanger 13 evaporate from outdoor unit gas side stop valve 9 In outdoor unit, and enter the evaporator port E of the four-way valve 2;Now, the evaporator port E and air-breathing pipe port of four-way valve 2 Conducting S, evaporates the low-temp low-pressure refrigerant for being formed and enters gas-liquid separator 7 by four-way valve 2, and from the gas-liquid separator 7 The port of export enters the gas returning port of the air injection enthalpy-increasing compressor 1, completes a kind of refrigeration cycle.
During the air-conditioning system heating operation, after refrigerant is compressed in air injection enthalpy-increasing compressor 1, into four-way valve 2 Exhaust port D, now four-way valve DE conductings, refrigerant after compression by four-way valve 2 evaporator port E, from gas side stop valve 9 Flow out to after being condensed into the first indoor set heat exchanger 11 and the second indoor set heat exchanger 13 respectively through the throttling of the first indoor set During the indoor set throttle part 14 of part 12 and second returns to outdoor air-conditioner from outdoor liquid side stop valve 8, a part of refrigerant passes through Second electronic throttle part 6 throttles into middle pressure liquid refrigerants and enters the first pipeline, then by outdoor unit electronic heating element 10 Heat absorption flashes to middle pressure gaseous coolant, and middle pressure chamber is entered from the jet of air injection enthalpy-increasing compressor;Another part refrigerant is by the The reducing pressure by regulating flow of one electronic throttle part 5 is exchanged heat into low-pressure liquid refrigerant into outdoor air cooling heat exchanger 3, low after evaporation Pressure gaseous coolant flows into gas-liquid separator 7 and returns to air injection enthalpy-increasing compressor 1 by four-way valve 2 again, and completion once heats circulation.
A kind of multi-online air-conditioning system of air injection enthalpy-increasing of the invention, hair in air-conditioning system is absorbed using the evaporation of refrigerant The heat of thermal element, while using the middle pressure gaseous coolant produced after refrigerant heat absorption evaporation, into air injection enthalpy-increasing compressor Pressure chamber, it is achieved thereby that the function of air injection enthalpy-increasing.Air injection enthalpy-increasing multi-online air-conditioning system of the invention, simple structure, Neng Gouman Heating performance high requirement under foot external world low temperature environment, both improves system effectiveness, and the purpose of energy-conserving and environment-protective has been reached again.
Fig. 2 is a kind of flow chart of the control method of air injection enthalpy-increasing multi-online air-conditioning system of the invention, is comprised the following steps:
Step 1, opens the second electronic throttle part, and a part of refrigerant enters through the second electronic throttle part 6 First pipeline 15;
Step 2, gathers the first refrigerant temperature of the arrival end of the first pipeline 15;
Step 3, gathers the second refrigerant temperature of the port of export of the first pipeline 15;
Step 4, calculates the difference of first refrigerant temperature and the second refrigerant temperature, and relatively more described difference is poor with default The size of value, generation control signal is sent to the second electronic throttle part 6, and the control signal is used to control described second The opening and closing of electronic throttle part 6.
In the present embodiment, step 4 is specially:
Setting preset difference value, the preset difference value includes the closing temperature difference threshold of the second electronic throttle part 6 and opens Open temperature difference threshold;
The difference of first refrigerant temperature and second refrigerant temperature is calculated, and judges the difference whether less than institute Closing temperature difference threshold is stated, if so, the first control signal for controlling the second electronic throttle part 6 to close then is generated, and It is sent to the second electronic throttle part 6;If it is not, the second electronic throttle part 6 is then kept for opening, Zhi Daojian The difference is measured less than the closing temperature difference threshold;
After the air injection enthalpy-increasing multi-online air-conditioning system runs one end time, first refrigerant temperature and institute are gathered again The second refrigerant temperature is stated, and calculates the difference of first refrigerant temperature and second refrigerant temperature;Judging the difference is It is no less than the unlatching temperature difference threshold, if so, it is closure state until described then to continue to keep the second electronic throttle part 6 Difference is not less than the unlatching temperature difference threshold;If it is not, then generating the second control for opening the second electronic throttle part 6 Signal, and it is sent to the second electronic throttle part 6.
In the present embodiment, the closing temperature difference threshold is 1 DEG C, and it is 5 DEG C to open temperature difference threshold.Open second electronics After throttle part 6, refrigerant enters the first pipeline 15, gathers the first refrigerant temperature and the second refrigerant temperature, and calculate described first The difference of refrigerant temperature and the second refrigerant temperature, if the difference of the first refrigerant temperature and the second refrigerant temperature is not less than 1 DEG C, Coolant quantity is appropriate in illustrating the first pipeline 15, and refrigerant heat absorption evaporation effect preferably, can keep the second electronic throttle part to be Open mode, refrigerant constantly enters the first pipeline 15;When the difference for detecting the first refrigerant temperature and the second refrigerant temperature is less than 1 DEG C when, illustrate more into coolant quantity in the first pipeline 15, then controller needs to send control signal to the second electronics section Stream unit 6, the second electronic throttle of temporary close part 6;The air injection enthalpy-increasing multi-online air-conditioning system continues to run with one end time Afterwards, until the difference of the first refrigerant temperature and the second refrigerant temperature reaches (be not less than) 5 DEG C of the temperature difference threshold of unlatching, the is illustrated Coolant quantity is less in one pipeline 15, and can increase the coolant quantity in the first pipeline 15 is needed with increasing the air injection enthalpy-increasing compressor 1 The middle pressure gaseous coolant wanted, now controller transmission control signal is to the second electronic throttle part 6, the second electronics section of opening Stream unit 6.In other embodiments, the closing temperature difference threshold is set to 2 DEG C, and the unlatching temperature difference threshold is set to 6 DEG C, it is also possible to Obtain preferable effect.
Control method of the invention adjusts the second electronic throttle part according to the first line entry end and the temperature difference of the port of export Aperture state, when the temperature difference at the first line entry end and the port of export is larger, then open the second electronic throttle part or guarantor The second electronic throttle part is held for open mode, increases the coolant quantity in the first pipeline;If the first line entry end and the port of export The temperature difference it is smaller when, then close the second electronic throttle part, reduce the coolant quantity in the first pipeline, until the first line entry end Setting value is reached with the temperature difference of the port of export, then opens the second electronic throttle part.Said process circulation is carried out, and constantly regulate enters The coolant quantity of first pipeline and the refrigerant temperature of the port of export, so as to reach the effect of air injection enthalpy-increasing and electronic heating element radiating Really, the heating performance requirement high under extraneous low temperature environment is disclosure satisfy that, system effectiveness is both improve, energy-conserving and environment-protective has been reached again Purpose.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.

Claims (10)

1. a kind of air injection enthalpy-increasing multi-online air-conditioning system, it is characterised in that:It is in parallel including an air-conditioner outdoor unit and at least two Indoor apparatus of air conditioner, the air-conditioner outdoor unit includes air injection enthalpy-increasing compressor (1), four-way valve (2), outdoor fan (3), outdoor wind Cold heat exchanger (4), outdoor unit liquid side stop valve (8), outdoor unit gas side stop valve (9) and outdoor unit electronic heating element (10),
The air injection enthalpy-increasing compressor (1) includes exhaust outlet, gas returning port and puff prot;
The four-way valve (2) includes exhaust port D, condensation port C, evaporator port E and air-breathing pipe port S, the exhaust end Mouth D connects the exhaust outlet of the compressor (1);
Outdoor air cooling heat exchanger (4) arrival end connects four-way valve (2) the condensation port C, and the port of export connects the outdoor Machine liquid side stop valve (8);Outdoor fan (3) is provided with the outdoor air cooling heat exchanger (4);
The first pipeline (15), the first pipeline (15) port of export connection are wound with the outdoor unit electronic heating element (10) The puff prot of the air injection enthalpy-increasing compressor (1), arrival end the connection outdoor air cooling heat exchanger (4) and the outdoor unit liquid side The arbitrary node of pipeline between stop valve (8), the outdoor unit electronic heating element (10) is for by first pipeline (15) In liquid refrigerants carry out heating evaporation into middle pressure gaseous coolant;
Described outdoor unit gas side stop valve (9) one end connects the evaporator port E of the four-way valve (2), and the other end passes through respectively The indoor apparatus of air conditioner in parallel connects the outdoor unit liquid side stop valve (8).
2. multi-online air-conditioning system according to claim 1, it is characterised in that:Also include gas-liquid separator (7), the gas Liquid/gas separator (7) arrival end connects four-way valve (2) the air-breathing pipe port S, and the port of export connects the air injection enthalpy-increasing compressor (1) Gas returning port.
3. multi-online air-conditioning system according to claim 1, it is characterised in that:Including in two the first air conditioning chambers of parallel connection Machine and the second indoor apparatus of air conditioner, first indoor apparatus of air conditioner include first indoor set heat exchanger (11) of series connection and the first interior Machine throttle part (12), second indoor apparatus of air conditioner includes second indoor set heat exchanger (13) and the second indoor set section of series connection Stream unit (14);First indoor set heat exchanger (11) and second indoor set heat exchanger (13) one end connect described respectively Outdoor unit gas side stop valve (9), the other end passes through the first indoor set throttle part (12) and the second indoor set throttle part respectively (14) the outdoor unit liquid side stop valve (8) is connected.
4. according to any described multi-online air-conditioning system of claims 1 to 3, it is characterised in that:The outdoor air cooling heat exchanger (4) the first electronic throttle part (5) is provided between the port of export and the outdoor unit liquid side stop valve (8);The outdoor is air-cooled The second electronic throttle part (6) is provided between heat exchanger (4) port of export and the outdoor unit electronic heating element (10).
5. multi-online air-conditioning system according to claim 4, it is characterised in that:The first electronic throttle part (5) and Second electronic throttle part (6) is respectively capillary, electric expansion valve or heating power expansion valve.
6. multi-online air-conditioning system according to claim 5, it is characterised in that:First pipeline (15) port of export connection The puff prot of the air injection enthalpy-increasing compressor (1), arrival end connects first electricity by the second electronic throttle part (6) The arbitrary node of pipeline between sub- throttle part (5) and the outdoor unit liquid side stop valve (8).
7. multi-online air-conditioning system according to claim 5, it is characterised in that:The air-conditioner outdoor unit also includes control Device, the first temperature sensor (16) and second temperature sensor (17),
First temperature sensor (16) is arranged on the outdoor unit electronic heating element (10) and second electronic throttle Between part (6), the first refrigerant temperature for gathering the first pipeline (15) arrival end, and by first refrigerant temperature It is sent to the controller;
The second temperature sensor (17) is arranged on the outdoor unit electronic heating element (10) and air injection enthalpy-increasing compression Between the puff prot of machine (1), the second refrigerant temperature for gathering the first pipeline (15) port of export, and it is cold by described second Matchmaker's temperature is sent to the controller;
The controller input connects first temperature sensor (16) and the second temperature sensor (17), output end The second electronic throttle part (6) is connected, the temperature difference for calculating second refrigerant temperature and the second refrigerant temperature, and root The control signal for controlling the second electronic throttle part (6) aperture is generated according to the temperature difference.
8. a kind of control method of air injection enthalpy-increasing multi-online air-conditioning system, the air injection enthalpy-increasing multi-online air-conditioning system will for right 1~7 any described air injection enthalpy-increasing multi-online air-conditioning system is sought, the control method is comprised the following steps:
Step 1, opens the second electronic throttle part, and a part of refrigerant enters the first pipeline through the second electronic throttle part (6) (15);
Step 2, gathers the first refrigerant temperature of the first pipeline (15) arrival end;
Step 3, gathers the second refrigerant temperature of the first pipeline (15) port of export;
Step 4, calculates the difference of first refrigerant temperature and the second refrigerant temperature, and relatively more described difference and preset difference value Size, generation control signal is sent to the second electronic throttle part (6), and the control signal is used to control second electricity The opening and closing of sub- throttle part (6).
9. control method according to claim 8, it is characterised in that:The step 4 is specially:
Setting preset difference value, the preset difference value includes closing temperature difference threshold and the unlatching of the second electronic throttle part (6) Temperature difference threshold;
The difference of first refrigerant temperature and second refrigerant temperature is calculated, and judges the difference whether less than the pass Temperature difference threshold is closed, if so, the first control signal for controlling the second electronic throttle part (6) to close then is generated, concurrently Give the second electronic throttle part (6);If it is not, it is opening then to keep the second electronic throttle part (6), until The difference is detected less than the closing temperature difference threshold;
After the air injection enthalpy-increasing multi-online air-conditioning system runs one end time, first refrigerant temperature and described are gathered again Two refrigerant temperatures, and calculate the difference of first refrigerant temperature and second refrigerant temperature;Judge whether the difference is small In the unlatching temperature difference threshold, if so, then continuation holding the second electronic throttle part (6) is closure state until the difference Value is not less than the unlatching temperature difference threshold;If it is not, then generating the second control for opening the second electronic throttle part (6) Signal, and it is sent to the second electronic throttle part (6).
10. control method according to claim 9, it is characterised in that:The closing temperature difference threshold is 1~2 DEG C;It is described to open Temperature difference threshold is opened for 5~6 DEG C.
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