CN104329824A - Multi-connected type air conditioner system and control method thereof - Google Patents

Multi-connected type air conditioner system and control method thereof Download PDF

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Publication number
CN104329824A
CN104329824A CN201310309781.8A CN201310309781A CN104329824A CN 104329824 A CN104329824 A CN 104329824A CN 201310309781 A CN201310309781 A CN 201310309781A CN 104329824 A CN104329824 A CN 104329824A
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China
Prior art keywords
control valve
heat exchanger
conditioning system
opened
valve
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Granted
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CN201310309781.8A
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Chinese (zh)
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CN104329824B (en
Inventor
王新利
熊美兵
许永锋
冯明坤
叶斌
赵增毅
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Guangdong Midea HVAC Equipment Co Ltd
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Guangdong Midea HVAC Equipment Co Ltd
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Publication of CN104329824A publication Critical patent/CN104329824A/en
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Classifications

    • 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
    • F25B13/00Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B47/00Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02Defrosting cycles
    • F25B47/022Defrosting cycles hot gas defrosting
    • F25B47/025Defrosting cycles hot gas defrosting by reversing the cycle
    • 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
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plants or systems

Abstract

The invention provides a multi-connected type air conditioner system and a defrosting control method of the system. The air conditioner system comprises a refrigerant circulation loop and a controller. The refrigerant circulation loop is formed by connecting at least one compressor, a four-way valve, an outdoor heat exchanger set and an indoor unit through a refrigerant pipe; the controller controls the system to run; the outdoor heat exchanger set comprises at least two outdoor module heat exchangers which are connected in parallel and auxiliary heat exchangers connected with the outdoor module heat exchangers. According to the multi-connected type air conditioner system, the outdoor heat exchanger set comprises two or more module heat exchangers, and the auxiliary heat exchangers are added; when a certain outdoor module heat exchanger meets the defrosting condition and needs to be defrosted, corresponding control valves and throttling components are controlled to be correspondingly linked through certain control logics, and therefore the defrosting aim of the outdoor module heat exchangers is achieved. The air conditioner system carries out defrosting and heating at the same time; in the modular defrosting period of the outdoor module heat exchangers, it can be ensured that hot air can be blown out of the indoor side, and the use effect of a user is ensured.

Description

Multi-connected air conditioning system and control method thereof
Technical field
The invention belongs to air-conditioning technical field, more particularly, relate to a kind of multi-connected air conditioning system and control method thereof.
Background technology
Current multi-connected air conditioning system, when winter heating runs, because outdoor environment temperature is lower, easily causes outdoor heat exchanger frosting, runs under frosting state, greatly reduce the heating capacity of air-conditioning system, must carry out defrosting operation by heat exchanger.Traditional defrost mode is when outdoor heat exchanger defrost, indoor set is in case cold wind state is run, interior machine blower fan stops, and after defrost terminates, air-conditioning system needs again to run the regular hour, the wind that just indoor set can be made to blow out is hot blast, so just makes the subjective feeling of user poor, is often complained.Therefore, traditional air-conditioning system, when defrost, not only greatly can reduce the heating capacity of air-conditioning, cause energy waste, and the result of use of user is also had a greatly reduced quality.
Summary of the invention
The object of the invention is to overcome above-mentioned prior art and know deficiency, a kind of multi-connected air conditioning system is provided, be intended to realize the continuity that keeping system heats while outdoor heat exchanger defrost, and improve entire system heating capacity.
For achieving the above object, the technical solution used in the present invention is: provide a kind of multi-connected air conditioning system, it is comprised the refrigerant circulation circuit that is connected by refrigerant pipe primarily of at least one compressor, cross valve, outdoor heat exchanger group and indoor set and controls the controller that air-conditioning system runs, and the S mouth of pipe of described cross valve is connected with the air entry of described compressor by low pressure gas pipe, the E mouth of pipe connects with the gas lateral line being connected described indoor set, the D mouth of pipe is connected with the exhaust outlet of described compressor;
Described outdoor heat exchanger group comprises at least two outdoor module heat exchangers be connected in parallel, each described outdoor module heat transfer equipment has the first port and the second port that pass in and out for refrigerant, second port of each described outdoor module heat exchanger is connected with a collateral road of liquid respectively, each collateral road of described liquid is connected with described indoor set by liquid lateral line after converging, and each collateral road of described liquid is respectively equipped with and is controlled and one first control valve be connected in parallel and first throttle parts by described controller;
First port of described outdoor module heat exchanger is connected to a collateral road of gas, and each collateral road of described gas is connected with the C mouth of pipe of described cross valve after converging, and each collateral road of described gas is also respectively equipped with second control valve controlled by described controller;
Also be provided with a supplementary heat exchanger, first side connector of described supplementary heat exchanger connects the Single port of a second section stream unit by pipeline, the another port of described second section stream unit connects the collateral road of gas between each described outdoor module heat exchanger and described second control valve respectively by diverter branch, and each described diverter branch being provided with respectively the 3rd control valve controlled by described controller, the second side connector of described supplementary heat exchanger is directly communicated with the pipeline of the C mouth of pipe being connected described cross valve.
Further, the low pressure gas pipe be connected with the air entry of described compressor is also provided with a gas-liquid separator, the S mouth of pipe of described cross valve is connected with the air inlet pipe of described gas-liquid separator, and the escape pipe of described gas-liquid separator is connected with the air entry of described compressor.
Alternatively, described supplementary heat exchanger is coiled, screen formula, wall-or bag wall-heat exchanger.
Further, described supplementary heat exchanger is also provided with a refrigerant heater controlled by described controller.
Alternatively, described first control valve and/or the second control valve and/or the 3rd control valve are magnetic valve or electric expansion valve.
Alternatively, described first throttle parts and/or second section stream unit are electric expansion valve, heating power expansion valve or capillary.
For achieving the above object, the present invention also provides a kind of control method of above-mentioned air-conditioning system, and described control method comprises:
Open air-conditioning system and enter heating mode;
Described compressor is opened and is run;
Described controller controls:
Described cross valve is in power-up state;
Close each described first control valve; Open each described first throttle parts, each described second control valve, each described 3rd control valve and described second section stream unit.
Further, described control method also comprises:
Open air-conditioning system and enter defrost pattern;
Described cross valve keeps power-up state, stays open described second section stream unit;
Described controller controls:
Close and be located on the different collateral roads of described liquid described at least one the first control valve and first throttle parts described at least one and opening are located on the different collateral roads of described liquid the first control valve and throttle part described at least one described at least one; With
Described second control valve that the described outdoor module heat exchanger be connected with the described first throttle parts opened is connected is opened and described second control valve that the described outdoor module heat exchanger be connected with described first control valve opened is connected is closed; With
Described 3rd control valve that the described outdoor module heat exchanger be connected with described first control valve opened is connected is opened and described 3rd control valve that the described outdoor module heat exchanger be connected with the described first throttle parts opened is connected is closed.
Preferably, described controller controls:
Described first control valve on the collateral road of liquid described in one of them is opened, described first throttle parts are closed; And described first control valve on the collateral road of liquid described in remaining is all closed, described first throttle parts are all opened;
Described second control valve that the described outdoor module heat exchanger be connected with described first control valve opened is connected is closed, described 3rd control valve is opened, and described second control valve that the described outdoor module heat exchanger be connected with the described first throttle parts opened is connected all is opened, described 3rd control valve is all closed.
Or described control method comprises:
Open air-conditioning system and enter refrigeration mode;
Described compressor is opened and is run;
Described controller controls:
Described cross valve is in power-down state;
Close each described first control valve, open each described first throttle parts, each described second control valve, each described 3rd control valve and described second section stream unit.
The beneficial effect of multi-connected air conditioning system provided by the invention and control method thereof is: compared with prior art, the outdoor heat exchanger of multi-connected air conditioning system of the present invention is divided into two or more outdoor module heat exchanger be connected in parallel, and increase connection supplementary heat exchanger, and corresponding control valve and throttle part, system cloud gray model heats period, when have a certain or certain several outdoor module heat exchanger reach defrost condition need defrost time, the unlatching of control valve and throttle part is controlled or the defrost that corresponding interlock controls outdoor module heat exchanger is carried out in closedown by certain control logic, flow through and need the refrigerant of the outdoor module heat exchanger of defrost again to evaporate through supplementary heat exchanger, finally get back to gas-liquid separator and compressor, the outdoor module heat exchanger of defrost is not needed to continue to run heating mode by original state, even if indoor set also can normal blowing hot-air while guaranteeing there is outdoor module heat exchanger defrosting, continue to indoor heating, ensure the comfort of user, and this system can realize according to specific needs to each outdoor module heat exchanger defrost in turn, in addition, air-conditioning system is normally run and is heated circulation time, it is overheated that the part refrigerant that supplementary heat exchanger can shunt outdoor module heat exchanger carries out, second throttle is realized to improve the heating capacity of system and to improve entire system heat exchange amount as second throttle device, or, the heat exchange area of increase system is used during refrigeration as forecooler, a precooling effect is played to the refrigerant flowed through wherein, enter outdoor module heat exchanger again and carry out condensation heat release, improve the refrigerating capacity of complete machine, strengthen the result of use of air-conditioning system.
Accompanying drawing explanation
The theory structure schematic diagram of the multi-connected air conditioning system that Fig. 1 provides for the embodiment of the present invention one;
The multi-connected air conditioning system operation logic state diagram in a heating mode that Fig. 2 provides for the embodiment of the present invention one;
The operation logic state diagram (one) that the multi-connected air conditioning system that Fig. 3 provides for the embodiment of the present invention one defrosts in a heating mode;
The operation logic state diagram (two) that the multi-connected air conditioning system that Fig. 4 provides for the embodiment of the present invention one defrosts in a heating mode;
The multi-connected air conditioning system operation logic state diagram in cooling mode that Fig. 5 provides for the embodiment of the present invention one;
The theory structure schematic diagram of the multi-connected air conditioning system that Fig. 6 provides for the embodiment of the present invention two;
The theory structure schematic diagram of the multi-connected air conditioning system that Fig. 7 provides for the embodiment of the present invention three.
Note: because improvement of the present invention does not relate to indoor set part, therefore the structure of all not shown indoor set of above-mentioned institute drawings attached and the coupling part relevant to indoor set.
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, is the principle assumption diagram of the multi-connected air conditioning system that the embodiment of the present invention one provides.This kind of multi-connected air conditioning system is comprised the refrigerant circulation circuit that is connected by refrigerant pipe primarily of a compressor 1, cross valve 2, outdoor heat exchanger group 3 and indoor set (not shown) and controls the controller (not shown) that air-conditioning system runs, wherein, the S mouth of pipe of cross valve 2 is connected with the air entry 11 of compressor 1 by low pressure gas pipe 93, the E mouth of pipe connects with the gas lateral line 92 being connected indoor set, the D mouth of pipe is connected with the exhaust outlet 12 of described compressor 1, (think personally the case of this theory structure, the content of claim has just been described clearly complete, do not know how to go to expand inside embodiment, and operation logic be the control method of putting behind embodiment inside describe in detail, therefore do not describe in this section) outdoor heat exchanger group 3 comprises two outdoor module heat exchangers 31 be connected in parallel, each outdoor module heat exchanger 31 all has the first port 311 and the second port 312 for refrigerant turnover, second port 312 of each outdoor module heat exchanger 31 is connected to the collateral road 911 of liquid, the collateral road 911 of each liquid is connected with indoor set by liquid lateral line 91 after converging, the collateral road 911 of each liquid is respectively equipped with and is controlled and the first control valve 51 be connected in parallel and first throttle parts 61 by controller,
First port 311 of each outdoor module heat exchanger 31 is connected to the collateral road 912 of gas, and the collateral road 912 of each gas is connected with the C mouth of pipe of cross valve 2 after converging, and the collateral road 912 of each gas is also respectively equipped with second control valve 52 controlled by controller;
Before outdoor module heat exchanger 31, a supplementary heat exchanger 7 is installed, first side connector 71 of supplementary heat exchanger 7 connects the Single port of second section stream unit 62 by pipeline, the another port of second section stream unit 62 is connected with the collateral road 912 of gas between the first port 311 of each outdoor module heat exchanger 31 and the second corresponding control valve 52 respectively by each diverter branch 913, and each diverter branch 913 being provided with respectively the 3rd control valve 53 controlled by controller, the second side connector 72 of supplementary heat exchanger 7 is directly communicated with the pipeline of the C mouth of pipe being connected cross valve 2.
In the present embodiment, can also also arrange gas-liquid separator 4 further on the low pressure gas pipe 93 be connected with the air entry 11 of compressor 1, the air inlet pipe of this gas-liquid separator 4 is connected with the S mouth of pipe of cross valve 2, and its escape pipe is connected with the air entry 11 of compressor 1.
In the present embodiment, supplementary heat exchanger 7 can select coiled, screen formula, wall-or bag wall-heat exchanger.
Fully gasify to allow the refrigerant in supplementary heat exchanger 7 better, supplementary heat exchanger 7 can be arranged the refrigerant heater (not shown) controlled by controller, for being located at the electric heater band of supplementary heat exchanger 7 periphery, with real-time as required, refrigerant can be heated.
In the present embodiment, first control valve 51, second control valve 52, the 3rd control valve 53 are mainly used in the break-make controlling refrigerant pipeline, therefore the valve body with on-off function that magnetic valve or electric expansion valve or other can be automatically controlled can be selected, but considering from needs and cost-saving angle, is good to select magnetic valve.
And first throttle parts 61, second section stream unit 62 can select electric expansion valve, heating power expansion valve or capillary, but to select 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, on the gas lateral line 92 be connected with each indoor heat exchanger He on liquid lateral line 91, a stop valve 8 can also be set respectively, 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.
Embodiment two
Refer to Fig. 6, be with the difference of embodiment one in the present embodiment, the group number of outdoor module heat exchanger 31 parallel connection of outdoor heat exchanger group is different, outdoor module heat exchanger 31 in the present embodiment is three groups, sets up simultaneously and sets up the first corresponding control valve 51, first throttle parts 61, second control valve 52 and the 3rd control valve 53 on the collateral road of outdoor module heat exchanger 31 gas 912, the collateral road of liquid 911, diverter branch 913 and each branch road.
Embodiment three
Refer to Fig. 7, be with the difference of embodiment one, example two in the present embodiment, the group number of outdoor module heat exchanger 31 parallel connection of outdoor heat exchanger group is different, outdoor module heat exchanger 31 in the present embodiment is four groups, sets up simultaneously and sets up the first corresponding control valve 51, first throttle parts 61, second control valve 52 and the 3rd control valve 53 on the collateral road of outdoor module heat exchanger 31 gas 912, the collateral road of liquid 911, diverter branch 913 and each branch road.
It is pointed out that and the situation that the group number of outdoor module heat exchanger 31 parallel connection in outdoor heat exchanger group is not limited to above-mentioned three embodiments and provides by that analogy, correspondingly can increase as required; Each above-mentioned outdoor module heat exchanger 31 is not limited to single heat exchanger simultaneously, and the combining structure formed after also can being the single heat exchanger series connection of two or more, every this similar distressed structure, all within protection scope of the present invention.
The control method of the multi-connected air conditioning system that the present invention also provides above-described embodiment to provide.This kind of control method runs heating mode for controlling this air-conditioning system.The multi-connected air conditioning system provided for embodiment one is below illustrated.
Refer to Fig. 1 and Fig. 2, this kind of control method comprises: open air-conditioning system and enter heating mode; Compressor 1 is opened and is run; Under control of the controller: cross valve 2 is in power-up state, its C mouth of pipe is communicated with the S mouth of pipe, the D mouth of pipe is communicated with the E mouth of pipe, and each first control valve 51 is all closed, each first throttle parts 61 are all opened, each second control valve 52 is all opened, each 3rd control valve 53 is all opened, second section stream unit 62 is opened.
According to above-mentioned control result, now pass through the refrigerant circulation circuit of simplification as shown in Figure 2, the concrete flow direction of refrigerant refers to shown in the arrow in Fig. 2, during the normal heating operation of this kind of multi-connected air conditioning system, the concrete condition that the refrigerant of system runs is: the high pressure gaseous refrigerant of discharging from compressor 1 passes through cross valve 2 to gas lateral line 92 and stop valve 8, heat exchange is carried out in indoor heat exchanger, reject heat to air-conditioned room, reach the object heated, machine high-temperature liquid state refrigerant out arrives liquid lateral line 91 and again through stop valve 8 indoor, then enter first throttle parts 61 respectively and carry out throttling, become the liquid refrigerants of low-temp low-pressure, arrive outdoor module heat exchanger 31, heat absorption evaporation in outdoor module heat exchanger 31, become the gaseous coolant of low-temp low-pressure, wherein, part refrigerant arrives supplementary heat exchanger 7 through the second throttle of diverter branch 913 and the 3rd control valve and second section stream unit, carry out in supplementary heat exchanger 7 effectively overheated after, converge with the gaseous coolant through the collateral road 912 of gas and the second control valve 52, enter cross valve 2 again, arrive gas-liquid separator 4 and carry out gas-liquid separation, finally get back to compressor 1 to compress, complete one and heat circulation.Within the normal heating operation cycle, it is overheated that supplementary heat exchanger 7 can carry out the refrigerant shunting the past in system, improves the heating capacity of system, heat result of use inside enhanced room.
Refer to Fig. 1 and Fig. 3 and Fig. 4 again, the present invention also provides the control method of above-mentioned multi-connected air conditioning system, continues heat supply for indoor while utilizing this control method can not commutate when running heating mode to realize defrost.
This control method comprises: open air-conditioning system and enter defrost pattern; Cross valve 2 keeps power-up state, and second section stream unit 62 stays open; Under controller controls: at least one first control valve 51 be located on the collateral road of different liquid 911 is closed with at least one first throttle parts 61 and at least one the first control valve 51 be located on the collateral road 911 of different liquid and at least one throttle part are opened; The second control valve 52 that the outdoor module heat exchanger 31 be connected with the first throttle parts 61 opened is connected is opened and the second control valve 52 that the outdoor module heat exchanger 31 be connected with the first control valve 51 opened is connected is closed; With the 3rd control valve 53 that is connected of the outdoor module heat exchanger 31 to be connected with the first control valve 51 opened opens and the 3rd control valve 53 that the outdoor module heat exchanger 31 be connected with the first throttle parts 61 opened is connected is closed.
According to above-mentioned control result, now pass through the refrigerant circulation circuit simplified as shown in Fig. 3 or Fig. 4, the concrete flow direction of refrigerant refers to shown in the arrow in figure.When outdoor module heat exchanger 31 reach defrost condition need defrost time, the concrete condition that in this kind of multi-connected air conditioning system, refrigerant runs is: the high pressure gaseous refrigerant of discharging from compressor 1 passes through cross valve 2 to gas lateral line 92 and stop valve 8, heat exchange is carried out in indoor heat exchanger, reject heat to air-conditioned room, reach the object heated, machine high-temperature liquid state refrigerant out arrives liquid lateral line 91 and again through stop valve 8 indoor, then two-way is divided into: the control valve opened of leading up to enters outdoor module heat exchanger 31 condensing heat-exchange needing defrost, frost on removing outdoor module heat exchanger 31, afterwards after the 3rd control valve 53 and second section stream unit 62 throttling, enter supplementary heat exchanger 7 heat absorption evaporation, become the gaseous coolant of low-temp low-pressure, another road refrigerant is the same with path during heating operation and effect, guarantee system can continue heat supply to indoor, after throttle part 61 throttling of opening, in outdoor module heat exchanger 31, heat absorption evaporation, becomes the gaseous coolant of low-temp low-pressure, after the second control valve 52, cross valve 2 is entered after converging with the gaseous coolant from supplementary heat exchanger 7, then arrive gas-liquid separator 4 and carry out gas-liquid separation, finally get back to compressor 1 and compress, complete a defrost process.
When there being outdoor module heat exchanger to need defrost, by above-mentioned control logic, each control valve and throttle part carry out corresponding linkage action, defrost when each outdoor module heat exchanger is different, but during the defrost of a part of outdoor module heat exchanger 31, another part outdoor module heat exchanger normally runs heating mode, thus during guarantee system cloud gray model, interior machine continues heat supply, and indoor has hot blast to blow out, and strengthens the satisfaction of user.
Its outdoor heat exchanger component of multi-connected air conditioning system provided by the invention is two or more outdoor module heat exchangers 31 be connected in parallel, and increase arranges supplementary heat exchanger 7, and corresponding control valve and throttle part, system cloud gray model heats period, when have outdoor module heat exchanger 31 reach defrost condition need defrost time, the unlatching of control valve and throttle part is controlled or the defrost that corresponding interlock controls outdoor module heat exchanger 31 is carried out in closedown by above-mentioned control method, flow through and need the refrigerant of the outdoor module heat exchanger 31 of defrost again to evaporate through supplementary heat exchanger 7, finally get back to gas-liquid separator 4 and compressor 1, the outdoor module heat exchanger 31 of defrost is not needed to continue to run heating mode by original state, even if indoor set also can normally continue to indoor heating by blowing hot-air while guaranteeing there is outdoor module heat exchanger 31 defrost, ensure the comfort of user, and this system can realize according to specific needs to each outdoor module heat exchanger 31 defrost in turn, in addition, air-conditioning system is normally run and is heated circulation time, and it is overheated that the part refrigerant that supplementary heat exchanger 7 can shunt outdoor module heat exchanger 31 carries out, and realizes second throttle to improve the heating capacity of system and to improve entire system heat exchange amount as second throttle device.
For the multi-connected air conditioning system being similar to above-described embodiment two and embodiment three and providing, the outdoor module heat exchanger 31 of more than three is comprised in its outdoor heat exchanger group, like this, just may there is the situation of a more than outdoor module heat exchanger 31 in defrosting in above-mentioned control method, this is unfavorable for the heating effect of guarantee system when system cloud gray model defrosting mode.Therefore, as a kind of preferred version, in above-mentioned control method, described controller controls: the first control valve 51 on the collateral road 911 of one of them liquid is opened, first throttle parts 61 are closed; And the first control valve 51 on the collateral road 911 of remaining liquid is all closed, first throttle parts 61 are all opened; This outdoor module heat exchanger 31 of outdoor module heat exchanger 31(be connected with the first control valve 51 opened needs to defrost) the second control valve 52 of being connected is closed, the 3rd control valve 53 is opened, and those outdoor module heat exchangers 31 of outdoor module heat exchanger 31(be connected with the first throttle parts 61 opened do not need to defrost) the second control valve 52 of being connected all is opened, the 3rd control valve 53 is all closed.So once only to the defrost of an outdoor module heat exchanger 31, the defrost in turn successively of all outdoor module heat exchangers 31, such system its heating capacity in the process of defrost is unlikely to excessive with overall heating capacity difference when normally running, and can ensure the result of use of user.
The present invention also provides a kind of control method of above-mentioned multi-connected air conditioning system, and this kind of control method is for controlling this air-conditioning system running refrigerating pattern, and control method also comprises following content: open air-conditioning system and enter refrigeration mode; Compressor 1 is opened and is run; Controller controls: cross valve 2 is in power-down state, and its C mouth of pipe is communicated with the D mouth of pipe, and the S mouth of pipe is communicated with the E mouth of pipe; Each first control valve 51 is closed, each first throttle parts 61 are opened, each second control valve 52 is opened, each 3rd control valve 53 is opened and opened with second section stream unit 62.
According to above-mentioned control result, now pass through the refrigerant circulation circuit of simplification as shown in Figure 5, the concrete flow direction of refrigerant refers to shown in the arrow in Fig. 5, see also Fig. 1, during the normal refrigerating operaton of this kind of multi-connected air conditioning system, the concrete condition that the refrigerant of system runs is: the high pressure gaseous refrigerant of discharging from compressor 1 is by shunting to each second control valve 52 and supplementary heat exchanger 7 after cross valve 2, refrigerant in supplementary heat exchanger 7 carries out condensation heat release, after after second section stream unit 62 throttling respectively by converge on the collateral road of each gas 912 with the second control valve 52 refrigerant out respectively after each diverter branch 913 and the 3rd control valve 53 and enter respectively carry out condensation heat release in each outdoor module heat exchanger 31 after become the liquid refrigerant of HTHP and flow through the collateral road of each liquid 911 and after the throttling of each first throttle parts 61, be pooled to liquid lateral line 91 and absorb heat through the heat exchanger that stop valve 8 enters in indoor set and evaporate, become the gaseous coolant of low-temp low-pressure, flow through stop valve 8 from gas lateral line 92 and enter cross valve 2, then arrive gas-liquid separator 4 and carry out gas-liquid separation, finally get back to compressor 1 to compress, complete a refrigerative circle system.
In process of refrigerastion, supplementary heat exchanger 7, also as forecooler, plays a precooling effect to the refrigerant flowed through wherein, then enters outdoor module heat exchanger 31 and carry out condensation heat release, thus improve heat exchange area and the refrigerating capacity of complete machine, strengthen the result of use of air-conditioning system.
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. a multi-connected air conditioning system, comprise the refrigerant circulation circuit that is connected by refrigerant pipe primarily of at least one compressor, cross valve, outdoor heat exchanger group and indoor set and control the controller that air-conditioning system runs, the S mouth of pipe of described cross valve is connected with the air entry of described compressor by low pressure gas pipe, the E mouth of pipe connects with the gas lateral line being connected described indoor set, the D mouth of pipe is connected with the exhaust outlet of described compressor; It is characterized in that:
Described outdoor heat exchanger group comprises at least two outdoor module heat exchangers be connected in parallel, each described outdoor module heat transfer equipment has the first port and the second port that pass in and out for refrigerant, second port of each described outdoor module heat exchanger is connected with a collateral road of liquid respectively, each collateral road of described liquid is connected with described indoor set by liquid lateral line after converging, and each collateral road of described liquid is respectively equipped with and is controlled and one first control valve be connected in parallel and first throttle parts by described controller;
First port of described outdoor module heat exchanger is connected to a collateral road of gas, and each collateral road of described gas is connected with the C mouth of pipe of described cross valve after converging, and each collateral road of described gas is also respectively equipped with second control valve controlled by described controller;
Also be provided with a supplementary heat exchanger, first side connector of described supplementary heat exchanger connects the Single port of a second section stream unit by pipeline, the another port of described second section stream unit connects the collateral road of gas between each described outdoor module heat exchanger and described second control valve respectively by diverter branch, and each described diverter branch being provided with respectively the 3rd control valve controlled by described controller, the second side connector of described supplementary heat exchanger is directly communicated with the pipeline of the C mouth of pipe being connected described cross valve.
2. multi-connected air conditioning system as claimed in claim 1, it is characterized in that: the low pressure gas pipe be connected with the air entry of described compressor is also provided with a gas-liquid separator, the S mouth of pipe of described cross valve is connected with the air inlet pipe of described gas-liquid separator, and the escape pipe of described gas-liquid separator is connected with the air entry of described compressor.
3. multi-connected air conditioning system as claimed in claim 2, is characterized in that: described supplementary heat exchanger is coiled, screen formula, wall-or bag wall-heat exchanger.
4. multi-connected air conditioning system as claimed in claim 3, is characterized in that: described supplementary heat exchanger is also provided with a refrigerant heater controlled by described controller.
5. the multi-connected air conditioning system as described in any one of Claims 1-4, is characterized in that: described first control valve and/or the second control valve and/or the 3rd control valve are magnetic valve or electric expansion valve.
6. the multi-connected air conditioning system as described in any one of Claims 1-4, is characterized in that: described first throttle parts and/or second section stream unit are electric expansion valve, heating power expansion valve or capillary.
7. the control method of the multi-connected air conditioning system as described in any one of claim 1 to 6, is characterized in that: described control method comprises:
Open air-conditioning system and enter heating mode;
Described compressor is opened and is run;
Described controller controls:
Described cross valve is in power-up state;
Close each described first control valve; Open each described first throttle parts, each described second control valve, each described 3rd control valve and described second section stream unit.
8. the control method of multi-connected air conditioning system as claimed in claim 7, is characterized in that: described control method also comprises:
Open air-conditioning system and enter defrost pattern;
Described cross valve keeps power-up state, stays open described second section stream unit;
Described controller controls:
Close the first control valve described at least one not on the same collateral road of described liquid and first throttle parts described at least one and open the first control valve and throttle part described at least one described at least one not on the same collateral road of described liquid; With
Described second control valve that the described outdoor module heat exchanger be connected with the described first throttle parts opened is connected is opened and described second control valve that the described outdoor module heat exchanger be connected with described first control valve opened is connected is closed; With
Described 3rd control valve that the described outdoor module heat exchanger be connected with described first control valve opened is connected is opened and described 3rd control valve that the described outdoor module heat exchanger be connected with the described first throttle parts opened is connected is closed.
9. the control method of multi-connected air conditioning system as claimed in claim 8, is characterized in that:
Described controller controls:
Described first control valve on the collateral road of liquid described in one of them is opened, described first throttle parts are closed; And described first control valve on the collateral road of liquid described in remaining is all closed, described first throttle parts are all opened;
Described second control valve that the described outdoor module heat exchanger be connected with described first control valve opened is connected is closed, described 3rd control valve is opened, and described second control valve that the described outdoor module heat exchanger be connected with the described first throttle parts opened is connected all is opened, described 3rd control valve is all closed.
10. the control method of the multi-connected air conditioning system as described in any one of claim 1 to 6, is characterized in that: described control method comprises:
Open air-conditioning system and enter refrigeration mode;
Described compressor is opened and is run;
Described controller controls:
Described cross valve is in power-down state;
Close each described first control valve, open each described first throttle parts, each described second control valve, each described 3rd control valve and described second section stream unit.
CN201310309781.8A 2013-07-22 2013-07-22 Multi-connected air conditioning system and control method thereof Active CN104329824B (en)

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CN104930600A (en) * 2015-03-31 2015-09-23 广东美的暖通设备有限公司 Outdoor unit of two-tube type heat recovery system and two-tube type heat recovery system with outdoor unit
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CN111609592A (en) * 2020-04-24 2020-09-01 珠海格力电器股份有限公司 Dual-temperature air conditioning system, control method and air conditioner
CN111609590A (en) * 2020-04-24 2020-09-01 珠海格力电器股份有限公司 Double-temperature air conditioning system, control method and air conditioner

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