CN104180560A - Multi-unit system - Google Patents

Multi-unit system Download PDF

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Publication number
CN104180560A
CN104180560A CN201410440826.XA CN201410440826A CN104180560A CN 104180560 A CN104180560 A CN 104180560A CN 201410440826 A CN201410440826 A CN 201410440826A CN 104180560 A CN104180560 A CN 104180560A
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China
Prior art keywords
air cooling
cooling heat
heat exchanger
valve
output
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Pending
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CN201410440826.XA
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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 CN201410440826.XA priority Critical patent/CN104180560A/en
Publication of CN104180560A publication Critical patent/CN104180560A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a multi-unit system. By replacing an original single air cooling heat exchanger with two air cooling heat exchangers, during low-temperature refrigeration, the multi-unit system can achieve the aim of the area of an air cooling condenser by powering off one of the air cooling heat exchangers, or reduce the area of the air cooling condenser, enlarge the area of an air cooling evaporator and reduce the risk of liquid-state refrigerant returning of the system by taking one of the air cooling heat exchangers as the condenser and the other air cooling heat exchanger as an evaporator; during high-temperature heating, the multi-unit system can take one of the air cooling heat exchangers as the evaporator and the other air cooling heat exchanger as the condenser to control and maintain system pressure and air return temperature within a reasonable range; during low-temperature heating and when the air cooling heat exchanger of an outdoor unit needs defrosting, the multi-unit system performs defrosting by taking one of the air cooling heat exchangers as the condenser and continues to perform heating by taking the other air cooling heat exchanger as the evaporator. Therefore, the requirements of units on continuous heat supply can be met, and further the comfort level of users can be guaranteed.

Description

A kind of multi-connected machine system
Technical field
The present invention relates to air-conditioning technical field, more particularly, relate to a kind of multi-connected machine system.
Background technology
Existing multi-connected machine system, the air cooling heat exchanger of off-premises station otherwise all do evaporimeter use, or all do condenser use.In the time of cryogenic refrigeration, the air cooling heat exchanger of off-premises station is all used as condenser, may make like this condensation effect very good, and evaporimeter can not evaporate completely, thereby causes system to return liquid refrigerants, when serious, causes compressor to burn; In the time that high temperature heats, compressor exhaust temperature is high, and at this moment system pressure also can be very high, and off-premises station air cooling heat exchanger is all used as evaporimeter, evaporation effect is very good, causes suction temperature very high, the words that suction temperature is high cause again delivery temperature high, and so vicious circle is gone down; In the time that the outdoor air cooling heat exchanger of low-temperature heating uses rear frosting as evaporimeter, when off-premises station air cooling heat exchanger is all used as condenser, indoor set heat exchanger is used as evaporimeter, the refrigerant of HTHP melts frost in the time of the condensation of off-premises station air cooling heat exchanger, but, condensed refrigerant need to be at indoor set heat exchanger the inside evaporation endothermic, like this, if the meeting that indoor set blows out is cold wind, even if do not dry, indoor set can not continue to heat, cause multi-connected machine system can not continue to provide the demand of heating, thereby affect user's comfortableness requirement.
In summary, how to provide a kind of multi-connected machine system, effectively improve multi-connected machine system cryogenic refrigeration, high temperature heat and reliability and the indoor comfort of low-temperature heating during need to defrosting be those skilled in the art's technical problems urgently to be resolved hurrily.
Summary of the invention
The invention provides a kind of multi-connected machine system, comprise: for the compressor of cold-producing medium is provided to system, for the first air cooling heat exchanger as evaporimeter or condenser use with for giving the first outdoor fan of described the first air cooling heat exchanger enhanced heat exchange, for the second air cooling heat exchanger as evaporimeter or condenser use with for giving the second outdoor fan of described the second air cooling heat exchanger enhanced heat exchange, for as refrigeration or heat the first indoor set and second indoor set of use, the high-pressure stop valve being connected with described the first indoor set input and described the second indoor set input, the low-pressure shutoff valve being connected with described the first indoor set output and described the second indoor set output, and first cross valve, the second cross valve, the first magnetic valve, the second magnetic valve,
Described the first air cooling heat exchanger and described the second air cooling heat exchanger are communicated with described high-pressure stop 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 each described compressor and air return end are accumulated to the output of compressor bank and the air return end of compressor bank;
The first end of described the first cross valve is communicated with described compressor bank output, the second end of described the first cross valve is communicated with described the first air cooling heat exchanger, and described the first cross valve is used for controlling described the first air cooling heat exchanger and uses or use as evaporimeter as condenser;
The input of described the first magnetic valve is communicated with described compressor bank output, and the port of export of described the first magnetic valve is communicated with described the second air cooling heat exchanger, and described the first magnetic valve is used for controlling described the second air cooling heat exchanger and uses as condenser;
The input of described the second magnetic valve connects the common end of described the second air cooling heat exchanger and described the first electromagnetic valve outlet end, the port of export of described the second magnetic valve is communicated with described compressor bank air return end, and described the second magnetic valve is used for controlling described the second air cooling heat exchanger and uses as evaporimeter;
Described in the first end of described the second cross valve, compressor bank output is communicated with, the 3rd end of described the second cross valve is communicated with described low-pressure shutoff valve, the second end of described the second cross valve and the common port of the 4th end and the output of described the second magnetic valve and the 3rd end of the first cross valve and the 4th end are communicated with, and described the second cross valve is used for controlling described the first indoor set and described the second indoor set for refrigeration or heats.
Preferably, also comprise: the first electric expansion valve;
Described the first air cooling heat exchanger is connected with described high-pressure stop valve by described the first electric expansion valve, and described the first electric expansion valve is for controlling the cold medium flux that flows through described the first air cooling heat exchanger.
Preferably, also comprise: the second electric expansion valve;
Described the second air cooling heat exchanger is connected with described high-pressure stop valve by described the second electric expansion valve, and described the second electric expansion valve is for controlling the cold medium flux that flows through described the second air cooling heat exchanger.
Preferably, also comprise gas-liquid separator;
The input of described gas-liquid separator is communicated with the output of described the second magnetic valve, the 3rd end the 4th end of the first cross valve and the second end the 4th end of the second cross valve, and the port of export of described gas-liquid separator is communicated with described compressor bank air return end.
Preferably, between the described gas-liquid separator port of export and described compressor bank air return end, be provided with low pressure switch and low-pressure sensor;
Described low pressure switch is for when the gas pressure between the described gas-liquid separator port of export and described compressor bank air return end is during lower than preset value, and low pressure switch disconnects automatically protects described compressor bank;
Described low-pressure sensor is for detection of the pressure between the described gas-liquid separator port of export and described compressor bank air return end.
Preferably, also comprise oil eliminator;
Described oil eliminator is provided with input, refrigerant output and oily output;
Described oil eliminator input is connected with the output of described compressor bank, and the refrigerant output of described oil eliminator is communicated with the first end of described the first magnetic valve input, the first cross valve first end, the second cross valve.
Preferably, the oily output of described oil eliminator is provided with the capillary being communicated with described compressor bank air return end;
Described capillary is for separating with refrigerator oil the high-pressure gaseous refrigerant that flows out compressor bank, high-pressure gaseous refrigerant is discharged by the refrigerant output of described oil eliminator, isolated refrigerator oil is flowed back to described compressor bank by the capillary of described oil eliminator oil output, 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;
Described the first indoor set input is communicated with described high-pressure stop valve by described multi-connected machine liquid side branch pipe; Described the second indoor set input is communicated with described high-pressure stop valve by described multi-connected machine liquid side branch pipe;
Described the first indoor set output is communicated with described low-pressure shutoff valve by described multi-connected machine gas side branch pipe; Described the second indoor set output is communicated with described low-pressure shutoff valve by described multi-connected machine gas side branch pipe.
Preferably, described compressor is frequency-changeable compressor, or frequency conversion constant speed compressor, or digital compressor, or digital constant speed compressor.
As can be seen from the above technical solutions, the present invention has the following advantages:
The present invention is by replacing two air cooling heat exchangers an original air cooling heat exchanger, make multi-connected machine system in the time of cryogenic refrigeration, by cutting off an air cooling heat exchanger, reach the object that reduces air-cooled condenser area, or one of them air cooling heat exchanger is made to condenser, and another one air cooling heat exchanger makees evaporimeter, reach and reduce air-cooled condenser area, increase the object of wind-cooled evaporator area, thereby reduction system is returned the risk of liquid refrigerants; When multi-connected machine system is in the time that high temperature heats, by using an air cooling heat exchanger as evaporimeter, a heat exchanger, as condenser, is realized system pressure and suction temperature control is maintained in the reasonable scope; When multi-connected machine system is during at low-temperature heating, the in the situation that of needing defrost after the frosting of off-premises station air cooling heat exchanger, by an air cooling heat exchanger is done to condenser defrost, air cooling heat exchanger makees evaporimeter and provides and continue to heat, meet unit and can continue to provide the demand heating, thereby ensured user's comfort level.Therefore, the indoor comfort problem of multi-connected machine system provided by the invention during effectively improving the integrity problem of multi-connected machine system in the time that cryogenic refrigeration, high temperature heat and low-temperature heating and need to defrosting.
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 used 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.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiment, 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.
Brief description of the drawings
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 skill in the art, 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 machine system of the embodiment of the present invention.
Detailed description of the invention
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.Based on the embodiment in this patent, those of ordinary skill in the art are not making all other embodiment that obtain under creative work prerequisite, all belong to the scope of this patent protection.
Shown in Figure 1, the present embodiment discloses a kind of structural representation of multi-connected machine system, multi-connected machine system comprises: for the compressor of cold-producing medium is provided to system, for the first air cooling heat exchanger 2 as evaporimeter or condenser use with for giving the first outdoor fan 3 of described the first air cooling heat exchanger 2 enhanced heat exchanges, for the second air cooling heat exchanger 4 as evaporimeter or condenser use with for giving the second outdoor fan 5 of described the second air cooling heat exchanger semi-finals heat exchange, for as refrigeration or heat the first indoor set 40 and second indoor set 41 of use, the high-pressure stop valve 15 being connected with described the first indoor set 40 inputs and described the second indoor set 41 inputs, the low-pressure shutoff valve 17 being connected with described the first indoor set 40 outputs and described the second indoor set 41 outputs, and first cross valve 7, the second cross valve 11, the first magnetic valve 8, the second magnetic valve 10,
Described the first air cooling heat exchanger 2 and described the second air cooling heat exchanger 4 are communicated with described high-pressure stop valve 15; The quantity of described compressor is at least one, described compressor can provide cold-producing medium to system, and described compressor composition compressor bank 1, and the output of each described compressor and air return end are accumulated to the output of compressor bank 1 and the air return end of compressor bank 1;
The first end of described the first cross valve 7 is communicated with described compressor bank 1 output, the second end of described the first cross valve 7 is communicated with described the first air cooling heat exchanger 2, and described the first cross valve 7 uses or uses as evaporimeter as condenser for controlling described the first air cooling heat exchanger 2;
The input of described the first magnetic valve 8 is communicated with described compressor bank 1 output, and the port of export of described the first magnetic valve 8 is communicated with described the second air cooling heat exchanger 4, and described the first magnetic valve 8 uses as condenser for controlling described the second air cooling heat exchanger 4;
The input of described the second magnetic valve 10 connects the common end of described the second air cooling heat exchanger 4 and described first magnetic valve 10 ports of export, the port of export of described the second magnetic valve 10 is communicated with described compressor bank 1 air return end, and described the second electromagnetism 10 valves are used for controlling described the second air cooling heat exchanger 4 and use as evaporimeter;
Described in the first end of described the second cross valve 11, compressor bank 1 output is communicated with, the 3rd end of described the second cross valve 11 is communicated with described low-pressure shutoff valve 17, the second end of described the second cross valve 11 and the common port of the 4th end and the output of described the second magnetic valve 11 and the 3rd end of the first cross valve 11 and the 4th end are communicated with, and described the second cross valve 11 is for controlling described the first indoor set 40 and described the second indoor set 41 for refrigeration or heating.
It should be noted that, cross valve (as above-mentioned the first cross valve 7, the second cross valve 11) in power down, first end D and the second end C conducting, the 3rd end E and the 4th end S conducting;
Cross valve in 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, the heat exchanger of the first indoor set 40 and the second indoor set 41 can be air cooling heat exchanger, can be also water cooling heat exchanger.
In summary it can be seen, the present invention is by replacing two air cooling heat exchangers an original air cooling heat exchanger, make multi-connected machine system in the time of cryogenic refrigeration, by cutting off an air cooling heat exchanger, reach the object that reduces air-cooled condenser area, or one of them air cooling heat exchanger is made to condenser, another one air cooling heat exchanger makees evaporimeter, reach and reduce air-cooled condenser area, increase the object of wind-cooled evaporator area, thereby reduction system is returned the risk of liquid refrigerants; When multi-connected machine system is in the time that high temperature heats, by using an air cooling heat exchanger as evaporimeter, a heat exchanger, as condenser, is realized system pressure and suction temperature control is maintained in the reasonable scope; When multi-connected machine system is during at low-temperature heating, the in the situation that of needing defrost after the frosting of off-premises station air cooling heat exchanger, by an air cooling heat exchanger is done to condenser defrost, air cooling heat exchanger makees evaporimeter and provides and continue to heat, meet unit and can continue to provide the demand heating, thereby ensured user's comfort level.Therefore, multi-connected machine system provided by the invention effectively improves the reliability of multi-connected machine system in the time that cryogenic refrigeration, high temperature heat and heats the indoor comfort needing during defrosting.
It will be understood by those skilled in the art that, for ensureing that the first air cooling heat exchanger 2 and the second air cooling heat exchanger 4 have good refrigeration in the time 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 air cooling heat exchanger 2 and the second air cooling heat exchanger 4 most important.
Therefore, the first air cooling 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 air cooling heat exchanger 2.
In like manner, the second air cooling 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 air cooling heat exchanger 4.
For further optimizing above-described embodiment, also comprise: gas-liquid separator 14;
The second end 11C, the 4th end 11S of the output of the input of gas-liquid separator 14 and the second magnetic valve 10, the 3rd end 7E, the 4th end 7S of the first cross valve 7, the second cross valve 11 is communicated with, and the port of export of gas-liquid separator 14 is communicated with described compressor bank 1 air return end.Gas-liquid separator 14 is for carrying out gas-liquid separation to the gaseous coolant of the gas returning port that flows into compressor bank 1.
For further optimizing above-described embodiment, also comprise: oil eliminator 6;
The input 6A of oil eliminator 6 connects the exhaust outlet of compressor bank 1, and the refrigerant output 6B of oil eliminator 6 connects the common port of the first end 11D of the first end 7D of the first cross valve 7 and the input of the first magnetic valve 8 and the second cross valve 11; The oily output 6C of oil eliminator 6 is provided with the capillary 24 being communicated with described compressor bank 1 air return end;
Oil eliminator 6 is for separating with compressor and freeze machine oil the gaseous coolant of the exhaust outlet that flows out compressor bank 1, high-pressure gaseous refrigerant is discharged by the refrigerant output 6B of oil eliminator 6, isolated compressor and freeze machine oil is discharged and is had the gas returning port of getting back to compressor bank 1 through capillary 24 by the oily output 6C of oil eliminator 6, and wherein capillary 24 is for controlling the oil drain quantity of oil eliminator.
In the present embodiment, multi-connected machine system is specific as follows in the loop control of freezing and heat:
Multi-connected machine system is in when refrigeration, the first cross valve 7 power down, and the first magnetic valve 8 powers on, the second magnetic valve 10 power down, the second cross valve 11 power down, the first electric expansion valve 11 and the second electric expansion valve 12 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 to after the first air cooling heat exchanger 2 condensations through the first electric expansion valve 11 reducing pressure by regulating flows, a part to after the first magnetic valve 8 to after the second air cooling heat exchanger 4 condensations through the second electric expansion valve 12 reducing pressure by regulating flows, liquid refrigerants after two air cooling 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 get back to gas-liquid separator 14 through the second cross valve 11 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.
It should be noted that, due to the second cross valve 11 power down, the first end 11D of the second cross valve 11 and the second end 11C conducting, the HTHP refrigerant that compressor bank 1 is got rid of is blocked up by capillary 24 the second cross valve 11 is interior, only flows through a small amount of refrigerant and gets back to gas-liquid separator 14 through capillary 24.
Multi-connected machine system is in the time heating, and the first cross valve 7 powers on, the first magnetic valve 8 power down, and the second magnetic valve 10 powers on, and the second cross valve 11 powers on, and the first electric expansion valve 11, the second electric expansion valve 12 are opened under the control of electric-control system.The refrigerant of the HTHP that compressor bank 1 is discharged is clipped to first indoor set 40 by after 51 shuntings of gas side branch pipe points through the second cross valve 11 after low-pressure shutoff valve 17, the second indoor set 41 condensations, condensed liquid refrigerants collaborates through liquid side branch pipe 50, a part is got back to gas-liquid separator 14 through the first cross valve 7 after the first electric expansion valve 11 reducing pressure by regulating flows after the first air cooling heat exchanger 2 evaporation endothermics, a part is got back to gas-liquid separator 14 through the second magnetic valve 10 after the second electric expansion valve 12 reducing pressure by regulating flows after the second air cooling heat exchanger 4 evaporation endothermics, finally getting back to compressor bank 1 completes and heats circulation, reach the object that multi-connected machine system heats.
It should be noted that, because the first cross valve 7 powers on, the first end 7D of the first cross valve 7 and the second end 7C conducting, the HTHP refrigerant that compressor bank 1 is got rid of is blocked up by capillary 24 the first cross valve 7 is interior, only flows through a small amount of refrigerant and gets back to gas-liquid separator 14 through capillary.
The detailed process of the comfortableness during multi-connected machine system disclosed by the invention has improved reliability that multi-connected machine system heats at cryogenic refrigeration, high temperature and low-temperature heating and need to defrost is as follows:
Multi-connected machine system is in the time of cryogenic refrigeration, air-cooled side environment temperature is low, and two air cooling heat exchangers are without all making condenser, now, can close an air cooling heat exchanger, such as closing the second air cooling heat exchanger 4, the first cross valve 7 power down of multi-connected machine system, the first magnetic valve 8 power down, the second magnetic valve 10 powers on, the second cross valve 11 power down, the first electric expansion valve 11 is opened under the control of electric-control system, and the second electric expansion valve 12 is closed.The refrigerant of the HTHP that compressor bank 1 is discharged all after the first cross valve 7 to first air cooling heat exchanger 2 condensations through the first electric expansion valve 11 reducing pressure by regulating flows, the liquid refrigerants of refrigerant after the first air cooling heat exchanger 2 reducing pressure by regulating flows is clipped to the first indoor set 40 by after 50 shuntings of liquid side branch pipe points 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 second cross valve 11 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 ensured the system reliability of freezing simultaneously under low ambient temperature.
It should be noted that, because the second electric expansion valve 13 is closed, and the first magnetic valve 8 cuts out, and the second magnetic valve 10 is opened, refrigerant in the second air cooling heat exchanger 4 is got back to gas-liquid separator 14 after the second magnetic valve 10, and refrigerant is namely equivalent to not circulate in the second air cooling heat exchanger 4.
Multi-connected machine system is in the time of cryogenic refrigeration, air-cooled side environment temperature is low, also low words of indoor environment temperature, an air cooling heat exchanger can be made to condenser, another one air cooling heat exchanger makees evaporimeter, such as the first air cooling heat exchanger 2 makees condenser, the second air cooling heat exchanger 4 makees evaporimeter, control as follows: the first cross valve 7 power down of multi-connected machine system, the first magnetic valve 8 power down, the second magnetic valve 10 powers on, the second cross valve 11 power down, the first electric expansion valve 11 is opened under the control of electric-control system, the second electric expansion valve 12 is opened under the control of electric-control system.The refrigerant of the HTHP that compressor bank 1 is discharged all after the first cross valve 7 to after the first air cooling heat exchanger 2 condensations through the first electric expansion valve 11 reducing pressure by regulating flows, the liquid refrigerants part of refrigerant after the first air cooling heat exchanger 2 reducing pressure by regulating flows through the second electric expansion valve 13 reducing pressure by regulating flows to after the second air cooling heat exchanger 4 evaporation endothermics by getting back to gas-liquid separator 14 after the second magnetic valve 10, a part of refrigerant is clipped to the first indoor set 40 and the second indoor set 41 devaporations heat absorptions by after liquid side branch pipe 50 shunting point after by high-pressure stop valve 15 more in addition, after evaporation endothermic, become gaseous coolant behind gas side branch pipe 51 interflow by getting back to gas-liquid separator 14 through the second cross valve 11 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 ensured the system reliability of freezing simultaneously under low ambient temperature.
Multi-connected machine system is in the time that high temperature heats, the heat exchanger of the first indoor set 40, the second indoor set 41 is made condenser, air cooling 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 increase like this condenser area, reduce evaporator area.Such as using the first air cooling heat exchanger 2 as evaporimeter, the second air cooling heat exchanger 4 is as condenser, and the heat exchanger of the first indoor set 40, the second indoor set 41 is made condenser.Control procedure is as follows: the first cross valve 7 powers on, the first magnetic valve 8 powers on, the second magnetic valve 10 power down, the second cross valve 11 powers on, the first electric expansion valve 11, the second electric expansion valve 12 is opened under the control of electric-control system, the HTHP refrigerant part that compressor bank 1 is discharged is divided and is clipped to the first indoor set 40 again to low-pressure shutoff valve 17 after the second cross valve 11 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, the HTHP refrigerant that compressor bank 1 is discharged an in addition part reaches between high-pressure stop valve 15 and the first electric expansion valve 12 and the second electric expansion valve 13 after the first magnetic valve 8 after the second air cooling heat exchanger 4 condensations after the second electric expansion valve 13, the condensed refrigerant of two-way 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.
In the time that multi-connected machine system hypothermia heats, when basic controlling process heats referring to above-mentioned multi-connected machine system, but because air-cooled side environment temperature is low, air cooling heat exchanger meeting frosting, if two air cooling heat exchangers (the first air cooling heat exchanger 2 and the second air cooling heat exchanger 4) defrost simultaneously, can cause the first indoor set 40, the second indoor set 41 to blow a cold wind over or do not dry, have influence on like this multi-connected machine system and can not continue to heat, and then affect user's comfortableness.In the time that air cooling heat exchanger needs defrost, can defrost as condenser by an air cooling heat exchanger, another air cooling heat exchanger is as evaporimeter, thus guarantee system continues water heating.Wherein, the process of air cooling heat exchanger defrost is shown in that air cooling heat exchanger when multi-connected machine system high temperature heats makees condenser, an air cooling heat exchanger does the process of evaporimeter, also can be multi-connected machine system hypothermia refrigeration time, an air cooling heat exchanger makees condenser, an air cooling heat exchanger does the process of evaporimeter, repeats no more herein.
In summary it can be seen, the present invention is by replacing two air cooling heat exchangers an original air cooling heat exchanger, make multi-connected machine system in the time of cryogenic refrigeration, by cutting off an air cooling heat exchanger, reach the object that reduces air-cooled condenser area, or one of them air cooling heat exchanger is made to condenser, another one air cooling heat exchanger makees evaporimeter, reach and reduce air-cooled condenser area, increase the object of wind-cooled evaporator area, thereby reduction system is returned the risk of liquid refrigerants; When multi-connected machine system is in the time that high temperature heats, by using an air cooling heat exchanger as evaporimeter, a heat exchanger, as condenser, is realized system pressure and suction temperature control is maintained in the reasonable scope; When multi-connected machine system is during at low-temperature heating, the in the situation that of needing defrost after the frosting of off-premises station air cooling heat exchanger, by an air cooling heat exchanger is done to condenser defrost, air cooling heat exchanger makees evaporimeter and provides and continue to heat, meet unit and can continue to provide the demand heating, thereby ensured user's comfort level.Therefore, multi-connected machine system provided by the invention effectively improves the reliability of multi-connected machine system in the time that cryogenic refrigeration, high temperature heat and heats the indoor comfort needing during defrosting.
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 moves reliably for ensureing multi-connected machine system stability, in the above-described embodiments:
On the link circuit of gas-liquid separator 14 outlet and the gas returning port of compressor bank 1, low pressure switch 21 is installed.
When the gas pressure between gas-liquid separator 14 outlet and the gas returning port 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.
On the link circuit of gas-liquid separator 14 outlet and the gas returning port of compressor bank 1, low-pressure sensor 20 is installed.The automatically controlled system low-voltage pressure feeding back by real-time detection low-pressure sensor 20 of multi-connected machine; after the logic control computing of participation system, make corresponding control or protection; such as low pressure being detected, adjust in real time the aperture size of the first electric expansion valve 12 and the second electric expansion valve 13 by logical operation.
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.
In addition; the system high pressure pressure that high-pressure sensor 23 can also detect and feed back in real time; after the logic control computing of participation system, make corresponding control or protection; such as high-pressure being detected, adjust in real time the aperture size of the first electric expansion valve 12 and the second electric expansion valve 13 by logical operation.
It should be noted is that, in above-described embodiment, the model of the first air cooling heat exchanger 2 and the second air cooling heat exchanger 4 can be identical, also can be different.Wherein, preferred same model.
The model of the first outdoor fan 3 and the second outdoor fan 5 can be identical, also can be different, do not limit herein.
The model of the first cross valve 7 and the second cross valve 11 is identical or different.Do not limit herein.In like manner, the model of the first magnetic valve 8 and the second magnetic valve 10 is identical or different.Do not limit herein.Described compressor is frequency-changeable compressor, or frequency conversion constant speed compressor, or digital compressor, or digital constant speed compressor.
In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.

Claims (10)

1. a multi-connected machine system, is characterized in that, comprising:
For the compressor of refrigerant is provided to system, for the first air cooling heat exchanger as evaporimeter or condenser use with for giving the first outdoor fan of described the first air cooling heat exchanger enhanced heat exchange, for the second air cooling heat exchanger as evaporimeter or condenser use with for giving the second outdoor fan of described the second air cooling heat exchanger enhanced heat exchange, for as refrigeration or heat the first indoor set and second indoor set of use, the high-pressure stop valve being connected with described the first indoor set input and described the second indoor set input, the low-pressure shutoff valve being connected with described the first indoor set output and described the second indoor set output, and first cross valve, the second cross valve, the first magnetic valve, the second magnetic valve,
Described the first air cooling heat exchanger and described the second air cooling heat exchanger are communicated with described high-pressure stop 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 each described compressor and air return end are accumulated to the output of compressor bank and the air return end of compressor bank;
The first end of described the first cross valve is communicated with described compressor bank output, the second end of described the first cross valve is communicated with described the first air cooling heat exchanger, and described the first cross valve is used for controlling described the first air cooling heat exchanger and uses or use as evaporimeter as condenser;
The input of described the first magnetic valve is communicated with described compressor bank output, and the port of export of described the first magnetic valve is communicated with described the second air cooling heat exchanger, and described the first magnetic valve is used for controlling described the second air cooling heat exchanger and uses as condenser;
The input of described the second magnetic valve connects the common end of described the second air cooling heat exchanger and described the first electromagnetic valve outlet end, the port of export of described the second magnetic valve is communicated with described compressor bank air return end, and described the second magnetic valve is used for controlling described the second air cooling heat exchanger and uses as evaporimeter;
Described in the first end of described the second cross valve, compressor bank output is communicated with, the 3rd end of described the second cross valve is communicated with described low-pressure shutoff valve, the second end of described the second cross valve and the common port of the 4th end and the output of described the second magnetic valve and the 3rd end of the first cross valve and the 4th end are communicated with, and described the second cross valve is used for controlling described the first indoor set and described the second indoor set for refrigeration or heats.
2. multi-connected machine system according to claim 1, is characterized in that,
Also comprise: the first electric expansion valve;
Described the first air cooling heat exchanger is connected with described high-pressure stop valve by described the first electric expansion valve, and described the first electric expansion valve is for controlling the cold medium flux that flows through described the first air cooling heat exchanger.
3. multi-connected machine system according to claim 1, is characterized in that,
Also comprise: the second electric expansion valve;
Described the second air cooling heat exchanger is connected with described high-pressure stop valve by described the second electric expansion valve, and described the second electric expansion valve is for controlling the cold medium flux that flows through described the second air cooling heat exchanger.
4. multi-connected machine system according to claim 1, is characterized in that,
Also comprise the gas-liquid separator for the refrigerant that flows into described compressor bank being carried out to gas-liquid separation; Described gas-liquid separator is provided with input and output;
The input of described gas-liquid separator is communicated with the output of described the second magnetic valve, the 3rd end the 4th end of the first cross valve and the second end the 4th end of the second cross valve, and the port of export of described gas-liquid separator is communicated with described compressor bank air return end.
5. multi-connected machine system according to claim 4, is characterized in that,
Between the described gas-liquid separator port of export and described compressor bank air return end, be provided with low pressure switch and low-pressure sensor;
Described low pressure switch is for when the gas pressure between the described gas-liquid separator port of export and described compressor bank air return end is during lower than preset value, and low pressure switch disconnects automatically protects described compressor bank;
Described low-pressure sensor is for detection of the pressure between the described gas-liquid separator port of export and described compressor bank air return end.
6. multi-connected machine system according to claim 1, is characterized in that,
Also comprise oil eliminator;
Described oil eliminator is provided with input, refrigerant output and oily output;
Described oil eliminator input is connected with the output of described compressor bank, and the refrigerant output of described oil eliminator is communicated with the first end of described the first magnetic valve input, the first cross valve first end, the second cross valve.
7. multi-connected machine system according to claim 6, is characterized in that,
The oily output of described oil eliminator is provided with the capillary being communicated with described compressor bank air return end;
Described capillary is for separating with refrigerator oil the high-pressure gaseous refrigerant that flows out compressor bank, high-pressure gaseous refrigerant is discharged by the refrigerant output of described oil eliminator, isolated refrigerator oil is flowed back to described compressor bank by the capillary of described oil eliminator oil output, and described capillary is for controlling the oil drain quantity of described oil eliminator.
8. multi-connected machine system according to claim 6, 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.
9. multi-connected machine 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;
Described the first indoor set input is communicated with described high-pressure stop valve by described multi-connected machine liquid side branch pipe; Described the second indoor set input is communicated with described high-pressure stop valve by described multi-connected machine liquid side branch pipe;
Described the first indoor set output is communicated with described low-pressure shutoff valve by described multi-connected machine gas side branch pipe; Described the second indoor set output is communicated with described low-pressure shutoff valve by described multi-connected machine gas side branch pipe.
10. multi-connected machine system according to claim 1, is characterized in that,
Described compressor is frequency-changeable compressor, or frequency conversion constant speed compressor, or digital compressor, or digital constant speed compressor.
CN201410440826.XA 2014-09-01 2014-09-01 Multi-unit system Pending CN104180560A (en)

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CN103968594A (en) * 2014-05-28 2014-08-06 广东志高暖通设备股份有限公司 Air cooling heat pump unit
CN103983044A (en) * 2014-05-28 2014-08-13 广东志高暖通设备股份有限公司 Air cooled heat pump unit

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CN203687235U (en) * 2013-09-10 2014-07-02 广东美的暖通设备有限公司 Air-conditioning outdoor unit, two-pipe refrigerating and heating system and three-pipe heating and recovering system
CN103776191A (en) * 2014-02-21 2014-05-07 广东志高暖通设备股份有限公司 Multi-split air conditioner and heat pump system thereof
CN103968594A (en) * 2014-05-28 2014-08-06 广东志高暖通设备股份有限公司 Air cooling heat pump unit
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CN104913461A (en) * 2015-07-01 2015-09-16 珠海格力电器股份有限公司 Control method of multi-connected set, and multi-connected set
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CN112594871A (en) * 2020-12-31 2021-04-02 广东积微科技有限公司 Defrosting control method of multifunctional multi-split system with double four-way valves

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Application publication date: 20141203