CN104197571A - Three-pipe heat recovery multiple-on-line system - Google Patents

Three-pipe heat recovery multiple-on-line system Download PDF

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Publication number
CN104197571A
CN104197571A CN201410440780.1A CN201410440780A CN104197571A CN 104197571 A CN104197571 A CN 104197571A CN 201410440780 A CN201410440780 A CN 201410440780A CN 104197571 A CN104197571 A CN 104197571A
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China
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pipe
indoor
communicated
valve
air
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CN201410440780.1A
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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 CN201410440780.1A priority Critical patent/CN104197571A/en
Publication of CN104197571A publication Critical patent/CN104197571A/en
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Abstract

The invention discloses a three-pipe heat recovery multiple-on-line system. Heat recovery characteristics of the three-pipe heat recovery multiple-on-line system are made full use of, input energy consumption of compressors is minimum, any one of outdoor air-cooled heat exchangers can be selected to serve as a condenser or an evaporator in use at will by making full use of heat exchange efficiency of outdoor air-cooled heat exchangers according to control needs of the system, the three-pipe heat recovery multiple-on-line system ensures high pressure, low pressure, the exhaust temperature, the back temperature and refrigerant distribution under any environment temperatures and any starting modes of indoor units by means of regulation of outdoor fans and four-way valves, therefore, high temperature and high pressure risks and liquid return risks of the system are reduced, and reliability of the system is ensured. By reasonably distributing refrigerants of the system, operation effect of the refrigerating and heating indoor units can be ensured, and the purpose of fully recovering heat to save energy is achieved.

Description

A kind of Three-pipe heat recovery multi-connected machine system
Technical field
The present invention relates to air-conditioning technical field, relate to a kind of Three-pipe heat recovery multi-connected machine system.
Background technology
Existing heating or refrigeration system, the air cooling heat exchanger of off-premises station or all make evaporimeter and use, or all make condenser and use.When 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.When high temperature heats, compressor exhaust temperature is high, 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, and the words that suction temperature is high cause again delivery temperature high, so vicious circle is gone down, and has a strong impact on the service life of whole system.
The heating effect that reaches the refrigeration of refrigeration indoor set simultaneously and heat indoor set in order to adapt to user's needs, common way is the heating effect that the output of compressor is strengthened to the refrigeration of the interior machine that simultaneously guarantees to freeze and heat interior machine, but the high-low pressure pressure of system and row's suction temperature also may improper meeting cause the too high or too low and system of system compresses machine pressure ratio to return liquid risk under this condition, when the outdoor air cooling heat exchanger of low-temperature heating is used 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 when 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 Three-pipe heat recovery multi-connected machine system can not continue to provide the demand of heating, thereby affect user's comfortableness requirement.
Summary of the invention
Based on above-mentioned technical problem, the invention provides a kind of Three-pipe heat recovery multi-connected machine system, comprise: for the compressor of cold-producing medium is provided to system, the first air cooling heat exchanger and for giving the first outdoor fan of described the first air cooling heat exchanger enhanced heat exchange, the second air cooling heat exchanger and for giving the second outdoor fan of described the second air cooling heat exchanger enhanced heat exchange, at least two indoor sets with identical with described indoor set quantity for controlling its working method that is communicated with indoor set for refrigeration or the cooling medium switching device that heats, off-premises station liquid pipe stop valve, off-premises station low pressure gas pipe stop valve, off-premises station high-pressure air pipe stop valve and the first cross valve, the second cross valve and the 3rd cross valve,
The quantity of described compressor is at least two, described in each, compressor can provide cold-producing medium to system simultaneously, and described compressor forms 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;
Described indoor set is provided with the gentle pipe end of liquid pipe end;
Described cooling medium switching device is provided with liquid pipe input, liquid pipe output, tracheae input, tracheae output, high-pressure air pipe input;
The liquid pipe end of described indoor set is communicated with the liquid pipe output of described indoor-unit cooling-medium switching device shifter, and the tracheae end of described indoor set is communicated with the tracheae output of described indoor-unit cooling-medium switching device shifter;
The liquid pipe input of described indoor-unit cooling-medium switching device shifter is communicated with described off-premises station liquid pipe stop valve;
The tracheae input of described indoor-unit cooling-medium switching device shifter is communicated with described off-premises station low pressure gas pipe stop valve;
The high-pressure air pipe input of described indoor-unit cooling-medium switching device shifter is communicated with the high-pressure air pipe stop valve of described off-premises station;
Described compressor bank air return end is communicated with described off-premises station low pressure gas pipe stop valve, and described compressor bank air return end is provided with the public end that is communicated with described off-premises station low pressure gas pipe stop valve interconnecting part;
The first end of the first end of the first end of described the first cross valve, described the second cross valve and described the 3rd 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 the 3rd end of described the first cross valve and the 4th end are communicated with the public end that is communicated with of described off-premises station low pressure gas pipe stop valve and described compressor bank air return end; Described the first cross valve is used for controlling described the first air cooling heat exchanger to be used or uses as evaporimeter as condenser;
The second end of described the second cross valve is communicated with described the second air cooling heat exchanger, and the 3rd end of described the second cross valve and the 4th end are communicated with the public end that is communicated with of described off-premises station low pressure gas pipe stop valve and described compressor bank air return end; Described the second cross valve is used for controlling described the second air cooling heat exchanger to be used or uses as evaporimeter as condenser;
The 3rd end of described the 3rd cross valve is communicated with described high-pressure air pipe stop valve, the second end of described the 3rd cross valve and the 4th end are communicated with the public end that is communicated with of described off-premises station low pressure gas pipe stop valve and described compressor bank air return end, for controlling described indoor set, heat or freeze.
Preferably, also comprise the first electric expansion valve;
Described the first air cooling heat exchanger is communicated with described off-premises station liquid pipe 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 communicated with described off-premises station liquid pipe 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; Described gas-liquid separator is provided with entrance point and the port of export;
Described gas-liquid separator is arranged on public the connection between end of described compressor bank air return end and described off-premises station low pressure gas pipe stop valve interconnecting part, and the entrance point of described gas-liquid separator is communicated with the public end that is communicated with, and the described gas-liquid separator port of export is communicated with described compressor bank air return end.
Preferably, also comprise for detection of the low-pressure sensor of pressure size between the described gas-liquid separator port of export and described compressor bank air return end with for according to the pressure size detecting, control the low tension switch that between the described gas-liquid separator port of export and described compressor bank air return end, pipeline is opened and turn-offed;
Described low tension switch and described low-pressure sensor are arranged 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 entrance point, refrigerant output and oily output;
Described oil eliminator entrance point is communicated with described compressor bank output, and the refrigerant output of described oil eliminator is communicated with the first end of the first end of described the first cross valve, described the second cross valve and the first end of described the 3rd cross valve;
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 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, between described compressor bank output and described oil eliminator entrance point, be provided with between high-pressure switch and high-pressure sensor or described oil eliminator and described cross valve the first common port and be provided with high-pressure switch and high-pressure sensor;
Described high-pressure sensor is for detection of the pressure size of described compressor bank output; Described high-pressure switch, for according to the pressure size detecting, is controlled described compressor bank opening and closing.
Preferably, Three-pipe heat recovery multi-connected machine system is provided with two indoor sets; Described two indoor sets comprise: the first indoor set and the second indoor set, Three-pipe heat recovery multi-connected machine system is also provided with the first indoor-unit cooling-medium switching device shifter of being connected with described the second indoor set with described the first indoor set respectively and described the second indoor-unit cooling-medium switching device shifter and liquid pipe branch pipe, low pressure gas pipe branch pipe, high-pressure air pipe branch pipe;
The liquid pipe output of described the first indoor-unit cooling-medium switching device shifter is communicated with the liquid pipe end of described the first indoor set, and the liquid pipe input of described the first indoor-unit cooling-medium switching device shifter is communicated with described off-premises station liquid pipe stop valve by described liquid pipe branch pipe; The low pressure gas pipe output of the first indoor-unit cooling-medium switching device shifter is communicated with the tracheae end of described the first indoor set; The tracheae input of the first indoor-unit cooling-medium switching device shifter is communicated with described off-premises station low pressure gas pipe stop valve by low pressure gas pipe branch pipe; The high-pressure air pipe input of the first indoor-unit cooling-medium switching device shifter is communicated with the high-pressure air pipe stop valve of described off-premises station by described high-pressure air pipe branch pipe;
The liquid pipe output of described the second indoor-unit cooling-medium switching device shifter is communicated with the liquid pipe end of described the second indoor set, and the liquid pipe input of described the second indoor-unit cooling-medium switching device shifter is communicated with the liquid pipe stop valve of described off-premises station by described liquid pipe branch pipe; The tracheae output of the second indoor-unit cooling-medium switching device shifter is communicated with the tracheae end of described indoor set; The low pressure gas pipe input of the first indoor-unit cooling-medium switching device shifter is communicated with the low pressure gas pipe stop valve of described off-premises station by low pressure gas pipe branch pipe; The high-pressure air pipe input of the first indoor-unit cooling-medium switching device shifter is communicated with the high-pressure air pipe stop valve of described off-premises station by high-pressure air pipe branch pipe.
Preferably, described compressor adopts frequency-changeable compressor, or constant speed compressor, or digital compressor.
As can be seen from the above technical solutions, the present invention has the following advantages:
The present invention makes full use of the recuperation of heat feature of Three-pipe heat recovery multi-connected machine, with minimum energy consumption of compressor input, making full use of the heat exchange efficiency of outdoor unit heat exchanger and needing freely to select any one outdoor air cooling heat exchanger according to the control of system is to use or evaporimeter use as condenser, and the adjusting by outdoor fan and cross valve makes Three-pipe heat recovery multi-connected machine system under any environment temperature and any indoor set open mode, guarantee that system high pressure and low pressure and delivery temperature and suction temperature and refrigerant distribute, thereby reduced the HTHP risk of system and returned the reliability that liquid risk has guaranteed system, thereby the reasonable distribution of system refrigerant has guaranteed refrigeration and has heated the operational effect of indoor set, and reached the object of sufficient heat recovery energy-saving.
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 Three-pipe heat recovery multi-connected machine entire system structure chart 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 Three-pipe heat recovery multi-connected machine system, refer to shown in Fig. 1, comprise: be at least two compressors, described in each, compressor can provide cold-producing medium to system simultaneously, 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 first air cooling heat exchanger 2, for giving the first outdoor fan 3 of the first air cooling heat exchanger 2 enhanced heat exchanges; The second air cooling heat exchanger 4, for giving the second outdoor fan 5 of the second air cooling heat exchanger semi-finals heat exchange;
In the present embodiment, Three-pipe heat recovery multi-connected machine system is provided with two indoor sets, and three indoor sets or four indoor sets can be set certainly, and concrete quantity does not limit here.The first indoor set 40 wherein, the second indoor set 41, the liquid pipe end 40A of the first indoor set 40 is communicated with the liquid pipe output 30A of indoor-unit cooling-medium switching device shifter 30, the tracheae end 40B of the first indoor set 40 is communicated with the tracheae output 30B of indoor-unit cooling-medium switching device shifter 30, the liquid pipe end 41A of the second indoor set 41 is communicated with the liquid pipe output 31A of indoor-unit cooling-medium switching device shifter 31, and the tracheae end 41B of the second indoor set 41 is communicated with the tracheae output 31B of indoor-unit cooling-medium switching device shifter 31.
In the present embodiment, Three-pipe heat recovery multi-connected machine system is provided with two indoor-unit cooling-medium switching device shifters, and three indoor sets or four indoor sets can be set certainly, and concrete quantity does not limit here.Two indoor-unit cooling-medium switching device shifters are: the first indoor-unit cooling-medium switching device shifter 30, the second indoor-unit cooling-medium switching device shifters 31.
The liquid pipe output 30A of the first indoor-unit cooling-medium switching device shifter 30 is communicated with the liquid pipe end 40A of indoor set 40, and by liquid pipe branch pipe 50, the off-premises station liquid pipe stop valve 15 with Three-pipe heat recovery multi-connected off-premises station is communicated with the liquid pipe input 30C of the first indoor-unit cooling-medium switching device shifter 30; The tracheae output 30B of the first indoor-unit cooling-medium switching device shifter 30 is communicated with the tracheae end 40B of indoor set 40; By low pressure gas pipe branch pipe 51, the low pressure gas pipe stop valve 16 with Three-pipe heat recovery multi-connected off-premises station is communicated with the low pressure gas pipe input 30D of the first indoor-unit cooling-medium switching device shifter 30; By high-pressure air pipe branch pipe 52, the high-pressure air pipe stop valve 17 with Three-pipe heat recovery multi-connected off-premises station is communicated with the high-pressure air pipe input 30E of the first indoor-unit cooling-medium switching device shifter 30; The first indoor-unit cooling-medium switching device shifter 30 still heats for freezing for controlling the indoor set 30 of its connection;
The liquid pipe output 31A of the second indoor-unit cooling-medium switching device shifter 31 is communicated with the liquid pipe end 41A of indoor set 41, and by multi-connected machine liquid pipe branch pipe 50, the off-premises station liquid pipe stop valve 15 with Three-pipe heat recovery multi-connected off-premises station is communicated with the liquid pipe input 31C of the second indoor-unit cooling-medium switching device shifter 31; The tracheae output 31B of the second indoor-unit cooling-medium switching device shifter 31 is communicated with the tracheae end 40B of indoor set 40; By low pressure gas pipe branch pipe 51, the low pressure gas pipe stop valve 16 with Three-pipe heat recovery multi-connected off-premises station is communicated with the low pressure gas pipe input 30D of the first indoor-unit cooling-medium switching device shifter 30; By high-pressure air pipe branch pipe 52, the high-pressure air pipe stop valve 17 with Three-pipe heat recovery multi-connected off-premises station is communicated with the high-pressure air pipe input 30E of the first indoor-unit cooling-medium switching device shifter 30; The first indoor-unit cooling-medium switching device shifter 31 still heats for freezing for controlling the indoor set 41 of its connection;
It should be noted that, the liquid pipe input 30C of indoor-unit cooling-medium switching device shifter or 31C and liquid pipe output 30A or 31A are conductings always, if the indoor set of its connection is refrigeration, the low pressure gas pipe input 30D of indoor-unit cooling-medium switching device shifter or 31D and tracheae output 30B or 31B conducting, high-pressure air pipe input 30E or 31E and tracheae output 30B or not conducting of 31B; If the indoor set of its connection is for heating, the low pressure gas pipe input 30D of indoor-unit cooling-medium switching device shifter or 31D and tracheae output 30B or not conducting of 31B, high-pressure air pipe input 30E or 31E and tracheae output 30B or 31B conducting;
The first end 7D of the first cross valve 7 is communicated with the refrigerant output 6B of oil eliminator 6, the second end 7C of the first cross valve 7 is communicated with the first air cooling heat exchanger 2, the 3rd end 7E of the first cross valve 7 and the common port of the 4th end 7S are communicated with the common port of the entrance point of low pressure gas pipe stop valve 16 and gas-liquid separator 14, and the first cross valve 7 is used or uses as evaporimeter as condenser for controlling the first air cooling heat exchanger 2;
The first end 8D of the second cross valve 8 is communicated with the refrigerant output 6B of oil eliminator 6, the second end 8C of the second cross valve 8 is communicated with the second air cooling heat exchanger 4, the 3rd end 8E of the second cross valve 8 and the common port of the 4th end 8S are communicated with the common port of the entrance point of low pressure gas pipe stop valve 16 and gas-liquid separator 14, and the second cross valve 8 is used or uses as evaporimeter as condenser for controlling the second air cooling heat exchanger 4;
The 3rd cross valve 11, the first end 11D of the 3rd cross valve 11 is communicated with the refrigerant output 6B of oil eliminator 6, the 3rd end 11E of the 3rd cross valve 11 is communicated with high-pressure air pipe stop valve 17, the second end 11C of the 3rd cross valve 11 and the common port of the 4th end 11S are communicated with the 3rd end 7E of the first cross valve 7 and the common port of the 4th end 7S, the 3rd end 8E of the second cross valve 8 and the common port of the 4th end 8S, and the 3rd cross valve 11 heats for controlling 2 or many indoor sets 40,41;
It should be noted that, cross valve (for example above-mentioned the first cross valve 7, the second cross valve 8, the 3rd cross valve 11) is in power down, first end 7D or 8D or 11D and the second end 7C or 8C or 11C conducting, the 3rd end 7E or 8E or 4E and the 4th end 7S or 8S or 11S conducting;
Cross valve when powering on, first end 7D or 8D or 11D and the 3rd end 7E or 8E or 11E conducting, the second end 7C or 8C or 11C and the 4th end 7S or 8S or 11S conducting.
In summary it can be seen, the present invention makes full use of the recuperation of heat feature of Three-pipe heat recovery multi-connected machine, with minimum energy consumption of compressor input, making full use of the heat exchange efficiency of outdoor unit heat exchanger and needing freely to select any one outdoor air cooling heat exchanger according to the control of system is to use or evaporimeter use as condenser, and the adjusting by outdoor fan and electric expansion valve makes Three-pipe heat recovery multi-connected machine system under any environment temperature and any interior machine open mode, guarantee that system high pressure and low pressure and delivery temperature and suction temperature and refrigerant distribute, thereby reduced the HTHP risk of system and returned the reliability that liquid risk has guaranteed system, thereby the reasonable distribution of system refrigerant has guaranteed refrigeration and has heated the operational effect of interior machine, and reached the object of sufficient heat recovery energy-saving.In addition, when Three-pipe heat recovery 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 is made evaporimeter and is provided and continue to heat, meet unit and can continue to provide the demand heating, thereby guaranteed user's comfort level.Therefore, the indoor comfort of Three-pipe heat recovery multi-connected machine system provided by the invention during effectively improving the integrity problem of Three-pipe heat recovery multi-connected machine system when cryogenic refrigeration, high temperature heat and low-temperature heating and need to defrosting.
For guaranteeing that the first air cooling heat exchanger 2 and the second air cooling 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 air cooling heat exchanger 2 and the second air cooling heat exchanger 4 most important.
Therefore, the first air cooling heat exchanger 2 is communicated with off-premises station liquid pipe 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 communicated with off-premises station liquid pipe 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.
In the present embodiment, the import of gas-liquid separator 14 is communicated with the second end 11C of the 3rd cross valve 11 and the common port of the 4th end 11S, and the outlet of gas-liquid separator 14 is communicated with compressor bank 1 gas returning port.Gas-liquid separator 14 is for carrying out gas-liquid separation to flowing into the gaseous coolant of compressor bank 1 gas returning port.
In the present embodiment, the entrance point 6A of oil eliminator 6 is communicated with the output of compressor bank 1, and the refrigerant output 6B of oil eliminator 6 is communicated with the common port of the first end 11D of the first cross valve 7, the second cross valve 8, the 3rd cross valve 11; The oily output 6C of oil eliminator 6 is communicated with the gas returning port of compressor bank 1 by capillary 24,25;
In the present embodiment, oil eliminator 6 is for carrying out separated to flowing out the gaseous coolant of compressor bank 1 output 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 gas returning port 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 embodiment, comprise for controlling the control system of Three-pipe heat recovery multi-connected machine system equipment operation, control system presets the program under Three-pipe heat recovery multi-connected machine system different running method, and the method for operation here comprises: the refrigeration program of Three-pipe heat recovery multi-connected machine system and heat program.Control system, by internal processor, is carried out the program of setting, and the processor here can adopt microcontroller or single-chip microcomputer.Specifically carry out refrigeration program and heat program and can be selected by user.When user selects after the performing a programme of Three-pipe heat recovery multi-connected machine system, system is carried out according to the program of setting, and performing a programme and the control mode of concrete control system do not limit here.
For embodiment of the present invention can be described more fully, illustrate Three-pipe heat recovery multi-connected machine system below in the working method of freezing or heating.
Three-pipe heat recovery multi-connected machine system is when whole indoor sets all freezes, the first cross valve 7 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, the 3rd cross valve 11 power down, electric-control system is by the low pressure gas pipe input 30D of indoor-unit cooling-medium switching device shifter 30,31 or 31D and tracheae output 30B or 31B conducting, and high-pressure air pipe input 30E or 31E and tracheae output 30B or 31B close.A refrigerant part for the HTHP that compressor bank 1 is discharged after the first cross valve 7 to the first air cooling heat exchanger 2 condensations by the first electric expansion valve 12 reducing pressure by regulating flows, a part after the second cross valve 8 to the second air cooling heat exchanger 4 condensations by the second electric expansion valve 13 reducing pressure by regulating flows, liquid refrigerants after two air cooling heat exchanger reducing pressure by regulating flows is clipped to the liquid pipe input 30C of indoor-unit cooling-medium switching device shifter 30 and the liquid pipe input 31C of indoor-unit cooling-medium switching device shifter 31 to off-premises station liquid pipe stop valve 15 for rear minute by 50 shuntings of liquid pipe branch pipe, through the refrigerant of the liquid pipe input 30C of indoor-unit cooling-medium switching device shifter 30 to after the heat exchanger devaporation heat absorption of the indoor set 40 of its connection after the tracheae output 30B of indoor-unit cooling-medium switching device shifter 30 to low pressure gas pipe input 30D, through the refrigerant of the liquid pipe input 31C of indoor-unit cooling-medium switching device shifter 31 to after the heat exchanger devaporation heat absorption of the indoor set 41 of its connection after the tracheae output 31B of indoor-unit cooling-medium switching device shifter 31 to low pressure gas pipe input 31D, then two strands of refrigerants are got back to gas-liquid separator 14 by low pressure gas pipe branch pipe 51 interflow to low pressure gas pipe stop valve 16, finally get back to compressor bank 1 and complete kind of refrigeration cycle, reach the object of Three-pipe heat recovery multi-connected machine cooling system.
It should be noted that, due to the 3rd cross valve 11 power down, the first end 11D of the first cross valve 11 and the second end 11C conducting, the HTHP refrigerant that compressor bank 1 is got rid of is fallen by capillary pipe plug the first cross valve 11 is interior, only flows through a small amount of refrigerant and gets back to gas-liquid separator 14 through capillary.
Three-pipe heat recovery multi-connected machine system is when whole indoor sets all heats, the 3rd cross valve 11 powers on, the first electric expansion valve 12, the second electric expansion valve 13 are opened under the control of electric-control system, the first cross valve 7, the second cross valve 8 power on, electric-control system is closed the low pressure gas pipe input 31D of indoor-unit cooling-medium switching device shifter 30,31 and tracheae output 31B, high-pressure air pipe input 31E and tracheae output 31B conducting.The refrigerant of the HTHP that compressor bank 1 is discharged through the 3rd cross valve 11 to after high-pressure air pipe stop valve 17 by the high-pressure air pipe input 30E of indoor-unit cooling-medium switching device shifter 30 and the high-pressure air pipe input 31E of indoor-unit cooling-medium switching device shifter 31 respectively after 52 shuntings of high-pressure air pipe branch pipe, through the refrigerant of the high-pressure air pipe input 30E of indoor-unit cooling-medium switching device shifter 30, to the heat exchanger of the indoor set 40 of its connection, go after condensation heat release after the liquid pipe output 30A of indoor-unit cooling-medium switching device shifter 30 to liquid pipe input 30C, through the refrigerant of the high-pressure air pipe input 31E of indoor-unit cooling-medium switching device shifter 31, to the heat exchanger of the indoor set 41 of its connection, go after condensation heat release after the liquid pipe output 31A of indoor-unit cooling-medium switching device shifter 31 to liquid pipe input 31C, then two strands of refrigerants arrive off-premises station liquid pipe stop valve 15 by liquid pipe branch pipe 50 interflow, a refrigerant part behind interflow 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 air cooling heat exchanger 2 evaporation endothermics, a part is got back to gas-liquid separator 14 through the second cross valve 8 after the second electric expansion valve 13 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 Three-pipe heat recovery 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 3rd end 7E conducting, the HTHP refrigerant that compressor bank 1 is got rid of is fallen by capillary pipe plug 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.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.
Three-pipe heat recovery multi-connected machine system disclosed by the invention improve machine in reliability that Three-pipe heat recovery multi-connected machine system heats at cryogenic refrigeration, high temperature and part open refrigeration and partly in machine to open the specific works process of the comfortableness during reliability under the condition of heating and comfortableness and low-temperature heating need to defrost as follows:
Three-pipe heat recovery multi-connected machine system is when cryogenic refrigeration, if whole indoor sets is all opened refrigeration, air-cooled side environment temperature is low, 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 Three-pipe heat recovery multi-connected machine system, the second cross valve 8 powers on, the first electric expansion valve 12 is opened under the control of electric-control system, the second electric expansion valve 13 is closed, the 3rd cross valve 11 power down, electric-control system is by indoor-unit cooling-medium switching device shifter 30, 31 low pressure gas pipe input 31D and tracheae output 31B conducting, high-pressure air pipe input 31E and tracheae output 31B close.The refrigerant of the HTHP that compressor bank 1 is discharged all after the first cross valve 7 to the first air cooling heat exchanger 2 condensations by the first electric expansion valve 12 reducing pressure by regulating flows, liquid refrigerants after reducing pressure by regulating flow divides and is clipped to the liquid pipe input 30C of indoor-unit cooling-medium switching device shifter 30 and the liquid pipe input 31C of indoor-unit cooling-medium switching device shifter 31 after off-premises station liquid pipe stop valve 15 after 50 shuntings of liquid side branch pipe, through the refrigerant of the liquid pipe input 30C of indoor-unit cooling-medium switching device shifter 30 to after the heat exchanger devaporation heat absorption of the indoor set 40 of its connection after the tracheae output 30B of indoor-unit cooling-medium switching device shifter 30 to low pressure gas pipe input 30D, through the refrigerant of the liquid pipe input 31C of indoor-unit cooling-medium switching device shifter 31 to after the heat exchanger devaporation heat absorption of the indoor set 41 of its connection after the tracheae output 31B of indoor-unit cooling-medium switching device shifter 31 to low pressure gas pipe input 31D, then two strands of refrigerants are got back to gas-liquid separator 14 by low pressure gas pipe branch pipe 51 interflow to low pressure gas pipe stop valve 16, finally get back to compressor bank 1 and complete kind of refrigeration cycle, reach the object of Three-pipe heat recovery 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 second electric expansion valve 13 is closed, the HTHP refrigerant that compressor bank 1 is discharged is fallen by capillary pipe plug the second cross valve 8 is interior, the excessively a small amount of refrigerant of refrigeration stream is got back to gas-liquid separator 13 through capillary, and refrigerant in the second air cooling heat exchanger 4 is got back to gas-liquid separator 13 after the second cross valve 8, refrigerant is namely equivalent to not circulate in the second air cooling heat exchanger 4.
Three-pipe heat recovery multi-connected machine system is when cryogenic refrigeration, air-cooled side environment temperature is low, indoor environment temperature is low words also, if whole indoor sets is all opened refrigeration, an air cooling heat exchanger can be made to condenser, another one air cooling heat exchanger is made evaporimeter, such as the first air cooling heat exchanger 2 is made condenser, the second air cooling heat exchanger 4 is made evaporimeter, control as follows: the first cross valve 7 power down of Three-pipe heat recovery multi-connected machine system, the second cross valve 8 powers on, the first electric expansion valve 12 is opened under the control of electric-control system, the second electric expansion valve 13 is opened under the control of electric-control system, the 3rd cross valve 11 power down, electric-control system is by indoor-unit cooling-medium switching device shifter 30, 31 low pressure gas pipe input 30D or 31D and tracheae output 30B or 31B conducting, high-pressure air pipe input 30E or 31E and tracheae output 30B or 31B close.The refrigerant of the HTHP that compressor bank 1 is discharged all to the first air cooling heat exchanger 2 condensations by the first electric expansion valve 12 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 cross valve 8, in addition a part of refrigerant by off-premises station liquid pipe stop valve 15 after again by within after liquid pipe branch pipe 50 shunting minute, being clipped to the liquid pipe input 30C of indoor-unit cooling-medium switching device shifter 30 and the liquid pipe input 31C of indoor-unit cooling-medium switching device shifter 31, through the refrigerant of the liquid pipe input 30C of indoor-unit cooling-medium switching device shifter 30 to after the heat exchanger devaporation heat absorption of the indoor set 40 of its connection after the tracheae output 30B of indoor-unit cooling-medium switching device shifter 30 to low pressure gas pipe input 30D, through the refrigerant of the liquid pipe input 31C of indoor-unit cooling-medium switching device shifter 31 to after the heat exchanger devaporation heat absorption of the indoor set 41 of its connection after the tracheae output 31B of indoor-unit cooling-medium switching device shifter 31 to low pressure gas pipe input 31D, then two strands of refrigerants are got back to gas-liquid separator 14 by low pressure gas pipe branch pipe 51 interflow to low pressure gas pipe stop valve 16, all refrigerants are finally got back to compressor bank 1 and are completed kind of refrigeration cycle, reach the object of Three-pipe heat recovery multi-connected machine cooling system.Also guaranteed the system reliability of freezing simultaneously under low ambient temperature.
Three-pipe heat recovery multi-connected machine system is opened refrigeration at part indoor set, part indoor set is opened while heating, such as the first indoor set 40 is opened refrigeration, the second indoor set 41 is opened and is heated, according to the heat balance of system and pressure, control needs, the air cooling heat exchanger part of off-premises station need to be made condenser, part need to be made evaporimeter, such as using the first air cooling heat exchanger 2 as condenser, the second air cooling heat exchanger 4 is as evaporimeter, control procedure is as follows: the first cross valve 7 power down of Three-pipe heat recovery multi-connected machine system, the second cross valve 8 powers on, the first electric expansion valve 12 is opened under the control of electric-control system, the second electric expansion valve 13 is opened under the control of electric-control system, the 3rd cross valve 11 powers on, electric-control system is by the low pressure gas pipe input 30D of indoor-unit cooling-medium switching device shifter 30 and tracheae output 30B conducting, high-pressure air pipe input 30E and tracheae output 30B close.The low pressure gas pipe input 31D of indoor-unit cooling-medium switching device shifter 31 and tracheae output 31B are closed to high-pressure air pipe input 31E and tracheae output 31B conducting.The HTHP refrigerant part that compressor bank 1 is discharged after the 3rd cross valve 11 to high-pressure air pipe stop valve 17 again after high pressure gas side branch pipe 52 to the high-pressure air pipe input 31E of the second indoor-unit cooling-medium switching device shifter 31, due to high-pressure air pipe input 31E and tracheae output 31B conducting, refrigerant is to the interior condensation heat release of indoor set 41, condensed liquid refrigerants arrives liquid pipe input 31C through the liquid pipe output 31A of the second indoor-unit cooling-medium switching device shifter 31, then arrive the common port of liquid pipe branch pipe 50 and off-premises station liquid pipe stop valve 15 and the first electric expansion valve 12 and the second electric expansion valve 13, the HTHP refrigerant that compressor bank 1 is discharged in addition a part after the first cross valve 7 to the common port that reaches off-premises station liquid pipe stop valve 15 and the first electric expansion valve 12 and the second electric expansion valve 13 and liquid pipe branch pipe 50 after the first air cooling heat exchanger 2 condensations after the first electric expansion valve 12, the condensed refrigerant of two-way interflow rear portion after the second electric expansion valve 13 to the second air cooling heat exchanger 4 evaporation endothermics, then through the second cross valve 8, finally get back to gas-liquid separator 14, a part of condensed refrigerant arrives liquid pipe output 30A through the liquid pipe input 30C of the first indoor-unit cooling-medium switching device shifter 30 in addition, then in the first indoor set 40, complete after evaporation endothermic, liquid pipe output 30B and low pressure gas pipe input 30D conducting due to the first indoor-unit cooling-medium switching device shifter 30, refrigerant after evaporation arrives low pressure gas pipe branch pipe 51 through the first indoor-unit cooling-medium switching device shifter 30, then through low pressure gas pipe stop valve 16, get back to gas-liquid separator 14, refrigerant after final two-way evaporation is all got back to compressor bank 1 and is completed whole refrigerant circulation.Reach Three-pipe heat recovery multi-connected machine components of system as directed indoor set refrigeration, the object that part indoor set heats.Also guaranteed the system operation reliability under low ambient temperature simultaneously.
It should be noted that, in order to guarantee the refrigeration of the first indoor set 40 and the heating effect of the first indoor set, the certain balance of caloric requirement of system, make full use of the recuperation of heat feature of Three-pipe heat recovery multi-connected machine, with minimum compressor input power consumption, by using outdoor air cooling heat exchanger part as condenser, part is as evaporimeter, and regulate by the Flow-rate adjustment of the first electric expansion valve 12 and the second electric expansion valve 13 and the air quantity of the first outdoor fan 3 and the second outdoor fan 5, reach with minimum compressor power consumption input, guaranteed the refrigeration and the heating effect that heats interior machine of machine in refrigeration, both guaranteed that user's comfortableness had also reached the object of abundant heat recovery energy-saving, while outdoor fan, electric expansion valve, the adjusting of outdoor air cooling heat exchanger coordinates, the pressure and temperature of system is controlled in rational scope, also guaranteed the reliability of system.
When Three-pipe heat recovery multi-connected machine system hypothermia heats, if whole indoor sets is all opened and is heated, when basic controlling process heats referring to above-mentioned Three-pipe heat recovery 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 and the second indoor set 41 to blow a cold wind over or do not dry, have influence on like this Three-pipe heat recovery multi-connected machine system and can not continue to heat, and then affect user's comfortableness.When air cooling heat exchanger needs defrost, can as condenser, defrost by an air cooling heat exchanger, another air cooling heat exchanger is as evaporimeter, thus assurance system continues to heat.Wherein, the process of air cooling heat exchanger defrost is shown in that air cooling heat exchanger when Three-pipe heat recovery multi-connected machine system high temperature heats makees condenser, an air cooling heat exchanger is done the process of evaporimeter, also in the time of can being Three-pipe heat recovery multi-connected machine system hypothermia refrigeration, an air cooling heat exchanger is made condenser, an air cooling heat exchanger is done the process of evaporimeter, repeats no more herein.
Three-pipe heat recovery multi-connected machine system other environment temperatures and indoor set open ruuning situation under refrigeration or heating mode can with reference to more than various running statuses, repeat 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 full use of the recuperation of heat feature of Three-pipe heat recovery multi-connected machine, with minimum energy consumption of compressor input, making full use of the heat exchange efficiency of outdoor unit heat exchanger and needing freely to select any one outdoor air cooling heat exchanger according to the control of system is to use or evaporimeter use as condenser, and the adjusting by outdoor fan and electric expansion valve makes Three-pipe heat recovery multi-connected machine system under any environment temperature and any interior machine open mode, guarantee that system high pressure and low pressure and delivery temperature and suction temperature and refrigerant distribute, thereby reduced the HTHP risk of system and returned the reliability that liquid risk has guaranteed system, thereby the reasonable distribution of system refrigerant has guaranteed refrigeration and has heated the operational effect of interior machine, and reached the object of sufficient heat recovery energy-saving.In addition, when Three-pipe heat recovery 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 is made evaporimeter and is provided and continue to heat, meet unit and can continue to provide the demand heating, thereby guaranteed user's comfort level.Therefore, the indoor comfort of Three-pipe heat recovery multi-connected machine system provided by the invention during effectively improving the integrity problem of Three-pipe heat recovery multi-connected machine system when cryogenic refrigeration, high temperature heat and low-temperature heating and need to defrosting.
Hypertonia in Three-pipe heat recovery multi-connected machine system or the too low stable operation that all can affect Three-pipe heat recovery multi-connected machine system.Therefore, the present invention moves reliably for guaranteeing Three-pipe heat recovery multi-connected machine system stability, in the above-described embodiments:
In the present embodiment, the hypertonia in Three-pipe heat recovery multi-connected machine system or the too low stable operation that all can affect Three-pipe heat recovery multi-connected machine system.Therefore, for guaranteeing that Three-pipe heat recovery multi-connected machine system stability moves reliably, between described gas-liquid separator output and described compressor bank 1 air return end, be provided with low tension switch 21 and low-pressure sensor 20, low-pressure sensor 20 is for detection of pressure size between described gas-liquid separator output and described compressor bank air return end, low tension switch 21, for according to the pressure size detecting, is controlled pipeline opening and closing between described gas-liquid separator output and described compressor bank air return end.
Certainly gas pressure that here can also be between gas-liquid separator 14 outlets 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.
In addition, low-pressure sensor 20 can also real-time detecting system low pressure.Low-pressure sensor 20 real-time detecting system low pressures; and low pressure is fed back to electric-control system; electric-control system is made corresponding control or protection after logic control computing according to the low pressure of reponse system; such as low pressure being detected, electric-control system is adjusted the aperture size of the first electric expansion valve 12 and the second electric expansion valve 13 in real time by logical operation.
At described oil eliminator input 6A or refrigerant output 6B, be 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.
Certainly in the time of can also surpassing preset value at the pressure of the gas of compressor bank 1 here; 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 all right real-time detecting system high-pressure of high-pressure sensor 23; high-pressure sensor 23 real-time detecting system high-pressures; and high-pressure is fed back to electric-control system; electric-control system is according to the high-pressure feeding back to; after logic control computing, make corresponding control or protection, such as high-pressure being detected, electric-control system is adjusted the aperture size of the first electric expansion valve 12 and the second electric expansion valve 13 in real time 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, the second cross valve 8 and the 3rd cross valve 11 can be all identical or entirely not identical, or incomplete same, do not limit herein.
The model of indoor set is identical or different, does not limit herein.
The model of indoor-unit cooling-medium switching device shifter is identical or different, does not limit herein.
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.
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.

Claims (9)

1. a Three-pipe heat recovery multi-connected machine system, it is characterized in that, comprise: for the compressor of cold-producing medium is provided to system, the first air cooling heat exchanger and for giving the first outdoor fan of described the first air cooling heat exchanger enhanced heat exchange, the second air cooling heat exchanger and for giving the second outdoor fan of described the second air cooling heat exchanger enhanced heat exchange, at least two indoor sets with identical with described indoor set quantity for controlling its working method that is communicated with indoor set for refrigeration or the cooling medium switching device that heats, off-premises station liquid pipe stop valve, off-premises station low pressure gas pipe stop valve, off-premises station high-pressure air pipe stop valve and the first cross valve, the second cross valve and the 3rd cross valve,
The quantity of described compressor is at least two, described in each, compressor can provide cold-producing medium to system simultaneously, and described compressor forms 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;
Described indoor set is provided with the gentle pipe end of liquid pipe end;
Described cooling medium switching device is provided with liquid pipe input, liquid pipe output, tracheae input, tracheae output, high-pressure air pipe input;
The liquid pipe end of described indoor set is communicated with the liquid pipe output of described indoor-unit cooling-medium switching device shifter, and the tracheae end of described indoor set is communicated with the tracheae output of described indoor-unit cooling-medium switching device shifter;
The liquid pipe input of described indoor-unit cooling-medium switching device shifter is communicated with described off-premises station liquid pipe stop valve;
The tracheae input of described indoor-unit cooling-medium switching device shifter is communicated with described off-premises station low pressure gas pipe stop valve;
The high-pressure air pipe input of described indoor-unit cooling-medium switching device shifter is communicated with the high-pressure air pipe stop valve of described off-premises station;
Described compressor bank air return end is communicated with described off-premises station low pressure gas pipe stop valve, and described compressor bank air return end is provided with the public end that is communicated with described off-premises station low pressure gas pipe stop valve interconnecting part;
The first end of the first end of the first end of described the first cross valve, described the second cross valve and described the 3rd 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 the 3rd end of described the first cross valve and the 4th end are communicated with the public end that is communicated with of described off-premises station low pressure gas pipe stop valve and described compressor bank air return end; Described the first cross valve is used for controlling described the first air cooling heat exchanger to be used or uses as evaporimeter as condenser;
The second end of described the second cross valve is communicated with described the second air cooling heat exchanger, and the 3rd end of described the second cross valve and the 4th end are communicated with the public end that is communicated with of described off-premises station low pressure gas pipe stop valve and described compressor bank air return end; Described the second cross valve is used for controlling described the second air cooling heat exchanger to be used or uses as evaporimeter as condenser;
The 3rd end of described the 3rd cross valve is communicated with described high-pressure air pipe stop valve, the second end of described the 3rd cross valve and the 4th end are communicated with the public end that is communicated with of described off-premises station low pressure gas pipe stop valve and described compressor bank air return end, for controlling described indoor set, heat or freeze.
2. Three-pipe heat recovery 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 communicated with described off-premises station liquid pipe 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. Three-pipe heat recovery 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 communicated with described off-premises station liquid pipe 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. Three-pipe heat recovery multi-connected machine system according to claim 1, is characterized in that,
Also comprise gas-liquid separator; Described gas-liquid separator is provided with entrance point and the port of export;
Described gas-liquid separator is arranged on public the connection between end of described compressor bank air return end and described off-premises station low pressure gas pipe stop valve interconnecting part, and the entrance point of described gas-liquid separator is communicated with the public end that is communicated with, and the described gas-liquid separator port of export is communicated with described compressor bank air return end.
5. Three-pipe heat recovery multi-connected machine system according to claim 4, is characterized in that,
Also comprise for detection of the low-pressure sensor of pressure size between the described gas-liquid separator port of export and described compressor bank air return end with for according to the pressure size detecting, control the low tension switch that between the described gas-liquid separator port of export and described compressor bank air return end, pipeline is opened and turn-offed;
Described low tension switch and described low-pressure sensor are arranged between the described gas-liquid separator port of export and described compressor bank air return end.
6. Three-pipe heat recovery multi-connected machine system according to claim 1, is characterized in that,
Also comprise oil eliminator; Described oil eliminator is provided with entrance point, refrigerant output and oily output;
Described oil eliminator entrance point is communicated with described compressor bank output, and the refrigerant output of described oil eliminator is communicated with the first end of the first end of described the first cross valve, described the second cross valve and the first end of described the 3rd cross valve;
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 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.
7. Three-pipe heat recovery multi-connected machine system according to claim 6, is characterized in that,
Between described compressor bank output and described oil eliminator entrance point, be provided with between high-pressure switch and high-pressure sensor or described oil eliminator and described cross valve the first common port and be provided with high-pressure switch and high-pressure sensor;
Described high-pressure sensor is for detection of the pressure size of described compressor bank output; Described high-pressure switch, for according to the pressure size detecting, is controlled described compressor bank opening and closing.
8. Three-pipe heat recovery multi-connected machine system according to claim 1, is characterized in that,
Comprise: two indoor sets and two indoor-unit cooling-medium switching device shifters;
Also comprise: liquid pipe branch pipe, low pressure gas pipe branch pipe, high-pressure air pipe branch pipe;
The liquid pipe output of described the first indoor-unit cooling-medium switching device shifter is communicated with the liquid pipe end of described the first indoor set, and the liquid pipe input of described the first indoor-unit cooling-medium switching device shifter is communicated with described off-premises station liquid pipe stop valve by described liquid pipe branch pipe; The low pressure gas pipe output of the first indoor-unit cooling-medium switching device shifter is communicated with the tracheae end of described the first indoor set; The tracheae input of the first indoor-unit cooling-medium switching device shifter is communicated with described off-premises station low pressure gas pipe stop valve by low pressure gas pipe branch pipe; The high-pressure air pipe input of the first indoor-unit cooling-medium switching device shifter is communicated with the high-pressure air pipe stop valve of described off-premises station by described high-pressure air pipe branch pipe;
The liquid pipe output of described the second indoor-unit cooling-medium switching device shifter is communicated with the liquid pipe end of described the second indoor set, and the liquid pipe input of described the second indoor-unit cooling-medium switching device shifter is communicated with the liquid pipe stop valve of described off-premises station by described liquid pipe branch pipe; The tracheae output of the second indoor-unit cooling-medium switching device shifter is communicated with the tracheae end of described indoor set; The low pressure gas pipe input of the first indoor-unit cooling-medium switching device shifter is communicated with the low pressure gas pipe stop valve of described off-premises station by low pressure gas pipe branch pipe; The high-pressure air pipe input of the first indoor-unit cooling-medium switching device shifter is communicated with the high-pressure air pipe stop valve of described off-premises station by described high-pressure air pipe branch pipe.
9. Three-pipe heat recovery multi-connected machine system according to claim 1, is characterized in that,
Described compressor adopts frequency-changeable compressor, or constant speed compressor, or digital compressor.
CN201410440780.1A 2014-09-01 2014-09-01 Three-pipe heat recovery multiple-on-line system Pending CN104197571A (en)

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Application publication date: 20141210