CN104197432A - Multi-connection air conditioning system and refrigeration method - Google Patents

Multi-connection air conditioning system and refrigeration method Download PDF

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Publication number
CN104197432A
CN104197432A CN201410440857.5A CN201410440857A CN104197432A CN 104197432 A CN104197432 A CN 104197432A CN 201410440857 A CN201410440857 A CN 201410440857A CN 104197432 A CN104197432 A CN 104197432A
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China
Prior art keywords
valve
pressure
output
heat exchanger
outdoor heat
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CN201410440857.5A
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Chinese (zh)
Inventor
刘红斌
王峰
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Guangdong Chigo Heating and Ventilation Equipment Co Ltd
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Guangdong Chigo Heating and Ventilation Equipment Co Ltd
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Priority to CN201410440857.5A priority Critical patent/CN104197432A/en
Publication of CN104197432A publication Critical patent/CN104197432A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention provides a multi-connection air conditioning system which comprises a compressor or multiple compressors connected in parallel, two mutually-independent outdoor heat exchangers, two four-way valves and two electronic expansion valves. The two outdoor heat exchangers are used for replacing an original outdoor heat exchanger, so that in the low-temperature refrigeration process of the multi-connection air conditioning system, the area of a condenser is reduced by switching off one outdoor heat exchanger, pressure, exhaust temperature and back temperature of the system are controlled and maintained within a reasonable range, risks of liquid cold medium return of the system are reduced, and reliability of the system is guaranteed; in the high-temperature heating process of the multi-connection air conditioning system, the area of an evaporator is reduced by switching off one outdoor heat exchanger, pressure, exhaust temperature and back temperature of the system are controlled and maintained within a reasonable range, high-temperature and high-pressure risks of the system are reduced, and reliability of the system is guaranteed.

Description

A kind of multi-connected air conditioning system and refrigerating method
Technical field
The present invention relates to air-conditioning technical field, relate in particular to a kind of multi-connected air conditioning system and refrigerating method.
Background technology
The outdoor heat exchanger of existing multi-connected air conditioning system is to make a whole stream substantially, this whole stream when off-premises station is smaller, is conducive to production technology and off-premises station is controlled, what but the ability of separate unit multi-connected machine off-premises station was done in the market is increasing, at present larger has 30, the off-premises station of an even larger number, the outdoor heat exchanger of this whole stream is when cryogenic refrigeration, outdoor heat exchanger is all used as condenser, may make like this condensation effect very good, evaporimeter can not evaporate completely, in refrigeration, function power is too sufficient causes the high frequent start and stop of off-premises station or causes system to return liquid refrigerants, when serious, cause compressor to burn, when high temperature heats, compressor exhaust temperature is high, at this moment system pressure also can be very high, and outdoor heat exchanger is all used as evaporimeter, evaporation effect is very good, and heating capacity too abundance causes compressor of outdoor unit frequent start-stop or causes suction temperature very high, and the words that suction temperature is high cause again delivery temperature higher, so the vicious circle compressor that goes down is worked all the time under high pressure, finally can burn compressor, current multi-connected machine mainly regulates off-premises station blower fan to turn the heat exchange efficiency that air quantity regulates outdoor unit heat exchanger by adopting to above two states, even but at current larger off-premises station, close off-premises station blower fan, while only utilizing heat exchanger to follow the heat convection of air still cannot solve cryogenic refrigeration, evaporation not exclusively makes system return to make when liquid and high temperature heat the too high and risk that causes burning compressor of system pressure.
Summary of the invention
The invention provides a kind of multi-connected air conditioning system, comprising:
For the compressor of refrigerant is provided to system, for making the refrigerant evaporation heat absorption of system or the first outdoor heat exchanger and second outdoor heat exchanger of condensation, for making the refrigerant evaporation heat absorption of system or the first indoor set and second indoor set of condensation, the high-pressure stop valve being connected with described the second indoor set input with described the first indoor set input, the low-pressure shutoff valve being connected with described the second indoor set output with described the first indoor set output, for controlling the first electric expansion valve of the cold medium flux that flows through described the first outdoor heat exchanger, for controlling the second electric expansion valve and first cross valve of the cold medium flux that flows through described the second outdoor heat exchanger, the second cross valve,
The quantity of described compressor is at least one, and described compressor can provide cold-producing medium to system, and described compressor composition compressor bank, and the output of compressor described in each and air return end are accumulated to the output of compressor bank and the air return end of compressor bank;
The input of described the first electric expansion valve is connected with the output of described the first outdoor heat exchanger, and the output of described the first electric expansion valve is connected with described high-pressure stop valve;
The input of described the second electric expansion valve is connected with the output of the second outdoor heat exchanger, and the output of described the second electric expansion valve is connected with described high-pressure stop valve;
The first end of described the first cross valve is connected with the output of described compressor bank, the second end of described the first cross valve is connected with the first end of described the second cross valve with the input of described the first outdoor heat exchanger, the 3rd end of described the first cross valve is connected with described low-pressure shutoff valve, and the 4th end of described the first cross valve is connected with the air return end of described compressor bank; Described the first cross valve is used for controlling described the first outdoor heat exchanger and described the second outdoor heat exchanger makes system enter refrigeration or heating mode;
The first end of described the second cross valve is connected with the input of described the first outdoor heat exchanger with the second end of described the first cross valve, the second end of described the second cross valve is connected with the input of described the second outdoor heat exchanger, and the 3rd end of described the second cross valve, the 4th end are connected with the 4th end of described the first cross valve and the air return end of described compressor bank simultaneously; Described the second cross valve cuts off the refrigerant of described the second outdoor heat exchanger while freezing for controlling.
Preferably, also comprise the gas-liquid separator for carrying out gas-liquid separation to flowing into the refrigerant of described compressor bank;
The input of described gas-liquid separator is connected with the 4th end of described the first cross valve, and the output of described gas-liquid separator is connected with the air return end of described compressor bank.
Preferably, also comprise for detection of the low-pressure sensor of pressure size between described gas-liquid separator output and described compressor bank air return end with for according to the pressure size detecting, control the low tension switch that between described gas-liquid separator output and described compressor bank air return end, passage is opened and turn-offed;
Described low tension switch and described low-pressure sensor are arranged between described gas-liquid separator output and described compressor bank air return end.
Preferably, also comprise oil eliminator;
The input of described oil eliminator is connected with the output of described compressor bank, and the refrigerant output of described oil eliminator is connected with the first end of described the first cross valve.
Preferably, the oily output of described oil eliminator is provided with the capillary being connected with described compressor bank air return end;
Described capillary is for carrying out separated to flowing out the high-pressure gaseous refrigerant of compressor bank with refrigerator oil, high-pressure gaseous refrigerant is discharged by the refrigerant output of described oil eliminator, capillary by isolated refrigerator oil by described oil eliminator oil output flows back to described compressor bank, and described capillary is for controlling the oil drain quantity of described oil eliminator.
Preferably, described oil eliminator input or refrigerant output are provided with high-pressure switch and high-pressure sensor;
Described high-pressure sensor is for detection of the pressure size of the output of described compressor bank; Described high-pressure switch, for according to the pressure size detecting, is controlled the opening and closing of described compressor bank output.
Preferably, also comprise: multi-connected machine liquid side branch pipe and multi-connected machine gas side branch pipe;
The input of described the first indoor set is connected with described high-pressure stop valve by described multi-connected machine liquid side branch pipe, and the input of the second indoor set is connected with described high-pressure stop valve by described multi-connected machine liquid side branch pipe;
The output of described the first indoor set is connected with described low-pressure shutoff valve by described multi-connected machine gas side branch pipe, and the output of described the second indoor set is connected with described low-pressure shutoff valve by described multi-connected machine gas side branch pipe.
Preferably, described compressor adopts frequency-changeable compressor, or constant speed compressor, or digital compressor.
Preferably, the model of described the first outdoor heat exchanger and described the second outdoor heat exchanger is identical or different;
The model of described the first electric expansion valve and described the second electric expansion valve is identical or different.
A refrigerating method for multi-connected air conditioning system, comprising:
The first cross valve power down, the second cross valve power down, the first electric expansion valve and the second electric expansion valve are opened;
Compressor bank is discharged HTHP refrigerant, and a part of HTHP refrigerant enters the first outdoor heat exchanger condensation liquefaction through the first cross valve, and condensation liquefaction is by the first electric expansion valve reducing pressure by regulating flow; Another part HTHP refrigerant enters the second outdoor heat exchanger condensation liquefaction through the first cross valve and the second cross valve, and condensation liquefaction is by the second electric expansion valve reducing pressure by regulating flow;
Liquid refrigerants after the first electric expansion valve and the second electric expansion valve reducing pressure by regulating flow, by multi-connected machine liquid side branch pipe be diverted in the first indoor set and the second indoor set in evaporation endothermic;
Liquid refrigerants forms gaseous coolant after evaporation endothermic respectively in the first indoor set and in the second indoor set, behind multi-connected machine gas side branch pipe interflow, through the first cross valve, enters gas-liquid separator;
Gaseous coolant, after gas-liquid separator gas-liquid separation, is got back to compressor bank and is completed kind of refrigeration cycle.
As can be seen from the above technical solutions, the present invention has the following advantages:
The present invention is by replacing two outdoor heat exchangers an original outdoor heat exchanger, make multi-connected machine system when cryogenic refrigeration, by cutting off an outdoor heat exchanger, reach the object that reduces condenser area, realization is controlled system pressure and exhaust and suction temperature to maintain in the reasonable scope, thereby reduction system is returned the risk of liquid refrigerants, guaranteed the reliability of system; When multi-connected machine system is when high temperature heats, by cutting off an outdoor heat exchanger, reach minimizing evaporator area, realize system pressure and exhaust and suction temperature are controlled and maintained in the reasonable scope, thereby it is dangerous to reduce system HTHP, guarantee the reliability of system.Therefore, a kind of multi-connected air conditioning system provided by the invention effectively improves the integrity problem of multi-connected machine system when cryogenic refrigeration, high temperature heat.
Term " first " in description of the present invention and claims and above-mentioned accompanying drawing, " second ", " the 3rd " " 4th " etc. (if existence) are for distinguishing similar object, and needn't be for describing specific order or precedence.The data that should be appreciated that such use suitably can exchanged in situation, so as embodiments of the invention described herein can with except diagram here or describe those order enforcement.In addition, term " comprises " and " having " and their any distortion, is intended to be to cover not exclusive comprising.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, to the accompanying drawing of required use in describing be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the disclosed a kind of multi-connected air conditioning system of the embodiment of the present invention;
Fig. 2 is the flow chart of the refrigerating method of multi-connected air conditioning system provided by the invention.
The specific embodiment
For making goal of the invention of the present invention, feature, advantage can be more obvious and understandable; to use specific embodiment and accompanying drawing below; technical scheme to the present invention's protection is clearly and completely described; obviously; the embodiments described below are only the present invention's part embodiment, but not whole embodiment.Embodiment based in this patent, those of ordinary skills are not making all other embodiment that obtain under creative work prerequisite, all belong to the scope of this patent protection.
The embodiment of the invention discloses a kind of multi-connected air conditioning system, referring to Fig. 1, comprising:
Specifically comprise for the compressor of refrigerant is provided to system, for making the refrigerant evaporation heat absorption of system or the first outdoor heat exchanger 2 and second outdoor heat exchanger 4 of condensation, for making the refrigerant evaporation heat absorption of system or the first indoor set 40 and second indoor set 41 of condensation, the high-pressure stop valve 15 being connected with described the second indoor set 41 inputs with described the first indoor set 40 inputs, the low-pressure shutoff valve 17 being connected with described the second indoor set 41 outputs with described the first indoor set 40 outputs, for controlling the first electric expansion valve 12 of the cold medium flux that flows through described the first outdoor heat exchanger 2, for controlling the second electric expansion valve 13 and first cross valve 7 of the cold medium flux that flows through described the second outdoor heat exchanger 4, the second cross valve 8,
The quantity of described compressor is at least one, described compressor can provide cold-producing medium to system, and described compressor forms compressor bank 1, and the output of compressor described in each and air return end are accumulated to the output of compressor bank 1 and the air return end of compressor bank 1;
The input of described the first electric expansion valve 12 is connected with the output of described the first outdoor heat exchanger 2, and the output of described the first electric expansion valve 12 is connected with described high-pressure stop valve 15;
The input of described the second electric expansion valve 4 is connected with the output of the second outdoor heat exchanger 13, and the output of described the second electric expansion valve 4 connects described high-pressure stop valve 15;
The first end 7D of described the first cross valve 7 is connected with the output of described compressor bank, the second end 7C of the first cross valve 7 is connected with the first end 8D of the second cross valve 8 with the input of the first outdoor heat exchanger 2, the 4th end 7S that the 3rd end 7E of the first cross valve 7 connects low-pressure shutoff valve 17, the first cross valves 7 is connected with the air return end of described compressor bank; The first cross valve 7 is refrigeration or heating mode for controlling the first outdoor heat exchanger 2 and the second outdoor heat exchanger 4;
The first end 8D of described the second cross valve 8 is connected with the input of the first outdoor heat exchanger 2 with the second end 7C of the first cross valve 7, the second end 8C of the second cross valve 8 is connected with the input of the second outdoor heat exchanger 4, and the 3rd end 8E of the second cross valve 8, the 4th end 8S are connected with the 4th end 7S of the first cross valve 7 and the air return end of compressor bank simultaneously; The second cross valve 8 cuts off the refrigerant of the second outdoor heat exchanger 4 while freezing for controlling;
It should be noted that, cross valve (for example above-mentioned the first cross valve 7, the second cross valve 8) in power down, first end D and the second end C conducting, the 3rd end E and the 4th end S conducting;
Cross valve when powering on, first end D and the 3rd end E conducting, the second end C and the 4th end S conducting.
In the present embodiment, two indoor sets: the first indoor set 40, the second indoor set 41, wherein the input 40A of the first indoor set 40 is connected with high-pressure stop valve 15 by multi-connected machine liquid side branch pipe 50, and the input 41A of the second indoor set 41 is connected with high-pressure stop valve 15 by multi-connected machine liquid side branch pipe 50; The output 40B of the first indoor set 40 is connected with low-pressure shutoff valve 17 by multi-connected machine gas side branch pipe 51, and the output 41B of the second indoor set 41 is connected with low-pressure shutoff valve 17 by multi-connected machine gas side branch pipe 51.
In summary it can be seen, the present invention is by replacing two outdoor heat exchangers an original outdoor heat exchanger, make multi-connected machine system when cryogenic refrigeration, by cutting off an outdoor heat exchanger, reach the object that reduces condenser area, realization is controlled system pressure and exhaust and suction temperature to maintain in the reasonable scope, thereby reduction system is returned the risk of liquid refrigerants, has guaranteed the reliability of system; When multi-connected machine system is when high temperature heats, by cutting off an outdoor heat exchanger, reach minimizing evaporator area, realize system pressure and exhaust and suction temperature are controlled and maintained in the reasonable scope, thereby it is dangerous to reduce system HTHP, guarantee the reliability of system.Therefore, a kind of multi-connected air conditioning system provided by the invention effectively improves the reliability of multi-connected machine system when cryogenic refrigeration, high temperature heat.
It will be understood by those skilled in the art that, for guaranteeing that the first outdoor heat exchanger 2 and the second outdoor heat exchanger 4 have good refrigeration when using as condenser, or there is good heating effect while using as evaporimeter, therefore, control that to flow through the cold medium flux of the first outdoor heat exchanger 2 and the second outdoor heat exchanger 4 most important.
Therefore, the first outdoor heat exchanger 2 is connected with high-pressure stop valve 15 by the first electric expansion valve 12, and the first electric expansion valve 12 is for controlling the cold medium flux that flows through the first outdoor heat exchanger 2.In like manner, the second outdoor heat exchanger 4 is connected with high-pressure stop valve 15 by the second electric expansion valve 13, and the second electric expansion valve 13 is for controlling the cold medium flux that flows through the second outdoor heat exchanger 4.
In the present embodiment, also comprise: gas-liquid separator 14;
The input of gas-liquid separator 14 is connected with the 4th end 7S of the first cross valve 7 and the 3rd end 8E of the second cross valve 8, the 4th end 8S, and the output of gas-liquid separator 14 connects the air return end of compressor bank 1;
Gas-liquid separator 14 is for carrying out gas-liquid separation to flowing into the gaseous coolant of the air return end of compressor bank 1.
For further optimizing above-described embodiment, also comprise: oil eliminator 6;
The entrance point 6A of oil eliminator 6 connects the air return end of compressor bank 1, and the refrigerant output 6B of oil eliminator 6 connects the first end 7D of cross valve 7; The oily output 6C of oil eliminator 6 connects the air return end of compressor bank 1 by capillary 24;
Oil eliminator 6 is for carrying out separated to flowing out the gaseous coolant of the air return end of compressor bank 1 with compressor and freeze machine oil, high-pressure gaseous refrigerant is discharged by the refrigerant output 6B of oil eliminator, isolated compressor and freeze machine oil has by the oily output 6C discharge of oil eliminator the air return end of getting back to compressor bank 1 through capillary 24, and wherein capillary 24 is for controlling the oil drain quantity of oil eliminator.
In the present invention, provide a kind of refrigerating method of multi-connected air conditioning system, refer to Fig. 2 and in conjunction with shown in Fig. 1, comprising:
S1: the first cross valve power down, the second cross valve power down, the first electric expansion valve and the second electric expansion valve are opened;
S2: compressor bank is discharged HTHP refrigerant, and a part of HTHP refrigerant enters the first outdoor heat exchanger condensation liquefaction through the first cross valve, and condensation liquefaction is by the first electric expansion valve reducing pressure by regulating flow; Another part HTHP refrigerant enters the second outdoor heat exchanger condensation liquefaction through the first cross valve and the second cross valve, and condensation liquefaction is by the second electric expansion valve reducing pressure by regulating flow;
S3: the liquid refrigerants after the first electric expansion valve and the second electric expansion valve reducing pressure by regulating flow, by multi-connected machine liquid side branch pipe be diverted in the first indoor set and the second indoor set in evaporation endothermic;
S4: liquid refrigerants forms gaseous coolant after evaporation endothermic respectively in the first indoor set and in the second indoor set, behind multi-connected machine gas side branch pipe interflow, enters gas-liquid separator through the first cross valve;
S5: gaseous coolant, after gas-liquid separator gas-liquid separation, is got back to compressor bank and completed kind of refrigeration cycle.
Multi-connected air conditioning system kind of refrigeration cycle is controlled specific as follows:
Multi-connected air conditioning system is in when refrigeration, the first cross valve 7 power down, and the second cross valve 8 power down, the first electric expansion valve 12 and the second electric expansion valve 13 are opened under the control of electric-control system.A refrigerant part for the HTHP that compressor bank 1 is discharged after the first cross valve 7 directly to the first outdoor heat exchanger 2 condensations by the first electric expansion valve 12 reducing pressure by regulating flows, a part after the first cross valve 7 again through the second cross valve 8 to second outdoor heat exchanger 4 condensations by the second electric expansion valve 13 reducing pressure by regulating flows, liquid refrigerants after two outdoor heat exchanger reducing pressure by regulating flows divides and is clipped to the first indoor set 40 after high-pressure stop valve 15 after 50 shuntings of liquid side branch pipe, the second indoor set 41 devaporation heat absorptions, after evaporation endothermic, become gaseous coolant and through the first cross valve 7, get back to gas-liquid separator 14 behind gas side branch pipe 51 interflow, finally get back to compressor bank 1 and complete kind of refrigeration cycle, reach the object of multi-connected machine cooling system.
Specific implementation process in multi-connected air conditioning system provided by the invention when heating is: the first cross valve 7 powers on, the second cross valve 8 power down, and the first electric expansion valve 12, the second electric expansion valve 13 are opened under the control of electric-control system.The refrigerant of the HTHP that compressor bank 1 is discharged through the first cross valve 7 to after low-pressure shutoff valve 17 by dividing and be clipped to the first indoor set 40 after 51 shuntings of gas side branch pipe, the second indoor set 41 condensations, condensed liquid refrigerants is through liquid side branch pipe 50 interflow, a part is got back to gas-liquid separator 14 through the first cross valve 7 after the first electric expansion valve 12 reducing pressure by regulating flows after the first outdoor heat exchanger 2 evaporation endothermics, a part is got back to gas-liquid separator 14 through the first cross valve 7 again after the second electric expansion valve 13 reducing pressure by regulating flows after the second outdoor heat exchanger 4 evaporation endothermics after the second cross valve 8, finally getting back to compressor bank 1 completes and heats circulation, reach the object that multi-connected machine system heats.
The detailed process of the reliability that multi-connected air conditioning system raising multi-connected machine system disclosed by the invention heats at cryogenic refrigeration, high temperature is as follows:
Multi-connected air conditioning system is when cryogenic refrigeration, air-cooled side environment temperature is low, two outdoor heat exchangers are without all making condenser, now, an outdoor heat exchanger can be closed, the second outdoor heat exchanger 4 can be closed, the first cross valve 7 power down of multi-connected air conditioning system, the second cross valve 8 powers on, and the first electric expansion valve 12 is opened under the control of electric-control system, and the second electric expansion valve 13 is closed.The refrigerant of the HTHP that compressor bank 1 is discharged all to the first outdoor heat exchanger 2 condensations by the first electric expansion valve 12 reducing pressure by regulating flows, the liquid refrigerants of refrigerant after the first air cooling heat exchanger 2 reducing pressure by regulating flows divides and is clipped to the first indoor set 40 after shunting by liquid side branch pipe 50 after high-pressure stop valve 15, the second indoor set 41 devaporation heat absorptions, after evaporation endothermic, become gaseous coolant behind gas side branch pipe 51 interflow by getting back to gas-liquid separator 14 through the first cross valve 7 again after low-pressure shutoff valve 17, finally get back to compressor bank 1 and complete kind of refrigeration cycle, reach the object of multi-connected machine cooling system.Also guaranteed the system reliability of freezing simultaneously under low ambient temperature.
It should be noted that, because the second cross valve 8 powers on, the first end 8D of the second cross valve 8 and the 3rd end 8E conducting, the HTHP refrigerant that compressor bank 1 is got rid of is blocked up by capillary 24 the second cross valve 8 is interior, only flows through a small amount of refrigerant and gets back to gas-liquid separator 14 through capillary 24.Because the second electric expansion valve 13 is closed, and the second end 8C of the second cross valve 8 and the 4th end 8S conducting, the refrigerant in the second cross valve 8 is all got back to gas-liquid separator 14, that is to say the refrigerant that do not circulate in the second cross valve 8.
Multi-connected air conditioning system is when high temperature heats, and the heat exchanger of the first indoor set 40, the second indoor set 41 is made condenser, and outdoor heat exchanger is made evaporimeter, air-cooled side environment temperature is high, evaporation effect is good, and compressor bank 1 delivery temperature is high, pressure at expulsion is high, can reduce evaporator area like this.Such as using the first air cooling heat exchanger 2 as evaporimeter, close the second outdoor heat exchanger 4.Control procedure is as follows: the first cross valve 7 powers on, the second cross valve 8 power down, and the first electric expansion valve 12 is opened under the control of electric-control system, and the second electric expansion valve 13 is closed.The HTHP refrigerant that compressor bank 1 is discharged divides and is clipped to the first indoor set 40 again to low-pressure shutoff valve 17 after the first cross valve 7 after 51 shuntings of gas side branch pipe, the interior condensation of the second indoor set 41, condensed refrigerant arrives between high-pressure stop valve 15 and the first electric expansion valve 12 and the second electric expansion valve 13 behind liquid side branch pipe 50 interflow, condensed refrigerant is finally by crossing after the first electric expansion valve 12 to the first air cooling heat exchanger 2 evaporation endothermics, then after the first cross valve 7 is finally got back to gas-liquid separator 14, get back to compressor bank 1 and complete whole refrigerant circulation.
Under above two kinds of conditions, the refrigerant that do not circulate in the second outdoor cold heat exchanger 4, is also just equivalent to reduce outdoor heat exchanger area, reduced condensation effect, guarantee high-pressure and low pressure that system is certain, controlled time liquid risk of system, improved widely the reliability of system.
In summary it can be seen, the present invention is by replacing two outdoor heat exchangers an original outdoor heat exchanger, make multi-connected machine system when cryogenic refrigeration, by cutting off an outdoor heat exchanger, reach the object that reduces condenser area, realization is controlled system pressure and exhaust and suction temperature to maintain in the reasonable scope, thereby reduction system is returned the risk of liquid refrigerants, has guaranteed the reliability of system; When multi-connected machine system is when high temperature heats, by cutting off an outdoor heat exchanger, reach minimizing evaporator area, realize system pressure and exhaust and suction temperature are controlled and maintained in the reasonable scope, thereby it is dangerous to reduce system HTHP, guarantee the reliability of system.Therefore, a kind of multi-connected air conditioning system provided by the invention effectively improves the reliability of multi-connected machine system when cryogenic refrigeration, high temperature heat.
It will be appreciated by persons skilled in the art that hypertonia or the too low stable operation that all can affect multi-connected machine system in multi-connected machine system.Therefore, the present invention is for guaranteeing the reliable and stable operation of multi-connected air conditioning system, in the above-described embodiments:
Also comprise for detection of the low-pressure sensor 20 of pressure size between described gas-liquid separator 14 outputs and described compressor bank 1 air return end with for according to the pressure size detecting, control the low tension switch 21 that between described gas-liquid separator 14 outputs and described compressor bank 1 air return end, pipeline is opened and turn-offed;
Described low tension switch 21 and described low-pressure sensor 20 are arranged between described gas-liquid separator 14 outputs and described compressor bank 1 air return end.
When the gas pressure between gas-liquid separator 14 outputs and the air return end of compressor bank 1 is during lower than preset value; low pressure switch 21 disconnects automatically; and send a pressure signal to electric-control system; thereby electric-control system is taked corresponding safeguard measure according to the pressure signal receiving; for example, turn off compressor bank 1.
The automatically controlled system low-voltage pressure that can also feed back by real-time detection low-pressure sensor 20 of multi-connected air conditioning system; after the logic control computing of participation system, make corresponding control or protection; such as low pressure being detected, by logical operation, adjust in real time the aperture size of the first electric expansion valve 12 and the second electric expansion valve 13.
Described oil eliminator 6 input 6A or refrigerant output 6B are provided with high-pressure switch 22 and high-pressure sensor 23;
Described high-pressure sensor 23 is for detection of the pressure size of the output of described compressor bank 1; Described high-pressure switch 22, for according to the pressure size detecting, is controlled the opening and closing of described compressor bank 1 output.
When the pressure of the gas of discharging when compressor bank 1 was looked into preset value; high-pressure switch 22 disconnects automatically, and sends a pressure signal to electric-control system, thereby electric-control system is taked corresponding safeguard measure according to the pressure signal receiving; for example, turn off compressor bank 1.
Certain automatically controlled system high pressure pressure that can also feed back by real-time detection high-pressure sensor 23 of multi-connected air conditioning system; after the logic control computing of participation system, make corresponding control or protection; such as high-pressure being detected, by logical operation, adjust in real time the aperture size of the first electric expansion valve 12 and the second electric expansion valve 13.
It should be noted is that, in above-described embodiment, the model of the first outdoor heat exchanger 2 and the second outdoor heat exchanger 4 can be identical, also can be different.Wherein, preferred same model.
The model of the first cross valve 7 and the second cross valve 8 can be identical, also can be different.Do not limit herein.
In like manner, the model of the first electric expansion valve 12 and the second electric expansion valve 13 can be identical, also can be different.Wherein, preferred same model.
Described compressor adopts frequency-changeable compressor, or constant speed compressor, or digital compressor.
In this description, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.

Claims (10)

1. a multi-connected air conditioning system, is characterized in that, comprising:
For the compressor of refrigerant is provided to system, for making the refrigerant evaporation heat absorption of system or the first outdoor heat exchanger and second outdoor heat exchanger of condensation, for making the refrigerant evaporation heat absorption of system or the first indoor set and second indoor set of condensation, the high-pressure stop valve being connected with described the second indoor set input with described the first indoor set input, the low-pressure shutoff valve being connected with described the second indoor set output with described the first indoor set output, for controlling the first electric expansion valve of the cold medium flux that flows through described the first outdoor heat exchanger, for controlling the second electric expansion valve and first cross valve of the cold medium flux that flows through described the second outdoor heat exchanger, the second cross valve,
The quantity of described compressor is at least one, and described compressor can provide cold-producing medium to system, and described compressor composition compressor bank, and the output of compressor described in each and air return end are accumulated to the output of compressor bank and the air return end of compressor bank;
The input of described the first electric expansion valve is connected with the output of described the first outdoor heat exchanger, and the output of described the first electric expansion valve is connected with described high-pressure stop valve;
The input of described the second electric expansion valve is connected with the output of described the second outdoor heat exchanger, and the output of described the second electric expansion valve is connected with described high-pressure stop valve;
The first end of described the first cross valve is connected with the output of described compressor bank, the second end of described the first cross valve is connected with the first end of described the second cross valve with the input of described the first outdoor heat exchanger, the 3rd end of described the first cross valve is connected with described low-pressure shutoff valve, and the 4th end of described the first cross valve is connected with the air return end of described compressor bank; Described the first cross valve is used for controlling described the first outdoor heat exchanger and described the second outdoor heat exchanger makes system enter refrigeration or heating mode;
The first end of described the second cross valve is connected with the input of described the first outdoor heat exchanger with the second end of described the first cross valve, the second end of described the second cross valve is connected with the input of described the second outdoor heat exchanger, and the 3rd end of described the second cross valve, the 4th end are connected with the 4th end of described the first cross valve and the air return end of described compressor bank simultaneously; Described the second cross valve cuts off the refrigerant of described the second outdoor heat exchanger while freezing for controlling.
2. multi-connected air conditioning system according to claim 1, is characterized in that,
Also comprise the gas-liquid separator for carrying out gas-liquid separation to flowing into the refrigerant of described compressor bank;
The input of described gas-liquid separator is connected with the 4th end of described the first cross valve and the 3rd end of described the second cross valve, the 4th end, and the output of described gas-liquid separator is connected with the air return end of described compressor bank.
3. multi-connected air conditioning system according to claim 2, is characterized in that,
Also comprise for detection of the low-pressure sensor of pressure size between described gas-liquid separator output and described compressor bank air return end with for according to the pressure size detecting, control the low tension switch that between described gas-liquid separator output and described compressor bank air return end, passage is opened and turn-offed;
Described low tension switch and described low-pressure sensor are arranged between described gas-liquid separator output and described compressor bank air return end.
4. multi-connected air conditioning system according to claim 1, is characterized in that,
Also comprise oil eliminator;
The input of described oil eliminator is connected with the output of described compressor bank, and the refrigerant output of described oil eliminator is connected with the first end of described the first cross valve.
5. multi-connected air conditioning system according to claim 4, is characterized in that,
The oily output of described oil eliminator is provided with the capillary being connected with described compressor bank air return end;
Described capillary is for carrying out separated to flowing out the high-pressure gaseous refrigerant of compressor bank with refrigerator oil, high-pressure gaseous refrigerant is discharged by the refrigerant output of described oil eliminator, capillary by isolated refrigerator oil by described oil eliminator oil output flows back to described compressor bank, and described capillary is for controlling the oil drain quantity of described oil eliminator.
6. multi-connected air conditioning system according to claim 4, is characterized in that,
Described oil eliminator input or refrigerant output are provided with high-pressure switch and high-pressure sensor;
Described high-pressure sensor is for detection of the pressure size of the output of described compressor bank; Described high-pressure switch, for according to the pressure size detecting, is controlled the opening and closing of described compressor bank output.
7. multi-connected air conditioning system according to claim 1, is characterized in that,
Also comprise: multi-connected machine liquid side branch pipe and multi-connected machine gas side branch pipe;
The input of described the first indoor set is connected with described high-pressure stop valve by described multi-connected machine liquid side branch pipe, and the input of the second indoor set is connected with described high-pressure stop valve by described multi-connected machine liquid side branch pipe;
The output of described the first indoor set is connected with described low-pressure shutoff valve by described multi-connected machine gas side branch pipe, and the output of described the second indoor set is connected with described low-pressure shutoff valve by described multi-connected machine gas side branch pipe.
8. multi-connected air conditioning system according to claim 1, is characterized in that,
Described compressor adopts frequency-changeable compressor, or constant speed compressor, or digital compressor.
9. multi-connected air conditioning system according to claim 1, is characterized in that,
The model of described the first outdoor heat exchanger and described the second outdoor heat exchanger is identical or different;
The model of described the first electric expansion valve and described the second electric expansion valve is identical or different.
10. a refrigerating method for multi-connected air conditioning system, is characterized in that, comprising:
S1: the first cross valve power down, the second cross valve power down, the first electric expansion valve and the second electric expansion valve are opened;
S2: compressor bank is discharged HTHP refrigerant, and a part of HTHP refrigerant enters the first outdoor heat exchanger condensation liquefaction through the first cross valve, and condensation liquefaction is by the first electric expansion valve reducing pressure by regulating flow; Another part HTHP refrigerant enters the second outdoor heat exchanger condensation liquefaction through the first cross valve and the second cross valve, and condensation liquefaction is by the second electric expansion valve reducing pressure by regulating flow;
S3: the liquid refrigerants after the first electric expansion valve and the second electric expansion valve reducing pressure by regulating flow, by multi-connected machine liquid side branch pipe be diverted in the first indoor set and the second indoor set in evaporation endothermic;
S4: liquid refrigerants forms gaseous coolant after evaporation endothermic respectively in the first indoor set and in the second indoor set, behind multi-connected machine gas side branch pipe interflow, enters gas-liquid separator through the first cross valve;
S5: gaseous coolant, after gas-liquid separator gas-liquid separation, is got back to compressor bank and completed kind of refrigeration cycle.
CN201410440857.5A 2014-09-01 2014-09-01 Multi-connection air conditioning system and refrigeration method Pending CN104197432A (en)

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