CN104197570A - Heating method and system of three-pipe heat recovery multiple-on-line system - Google Patents

Heating method and system of three-pipe heat recovery multiple-on-line system Download PDF

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Publication number
CN104197570A
CN104197570A CN201410440765.7A CN201410440765A CN104197570A CN 104197570 A CN104197570 A CN 104197570A CN 201410440765 A CN201410440765 A CN 201410440765A CN 104197570 A CN104197570 A CN 104197570A
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China
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pipe
indoor
output
communicated
switching device
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CN104197570B (en
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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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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a heating method of a three-pipe heat recovery multiple-on-line system. Two air-cooled heat exchangers replace an original air-cooled heat exchanger, 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 the 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 the 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 electronic expansion 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 heating indoor units can be ensured, and the purpose of fully recovering heat to save energy is achieved.

Description

A kind of heating method of Three-pipe heat recovery multi-connected machine system and system
Technical field
The present invention relates to air-conditioning technical field, relate to a kind of heating method and system of Three-pipe heat recovery multi-connected machine system.
Background technology
Existing heating, off-premises station is all made evaporimeter and is used.When heating, 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.
In order to adapt to user's needs, reach the heating effect that heats indoor set of refrigeration indoor set simultaneously, common way is the output of compressor to be strengthened to the heating effect that heats interior machine of the interior machine that simultaneously guarantees to freeze, 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 multi-connected machine system can not continue to provide the demand of heating, thereby affect user's comfortableness requirement.
Summary of the invention
The embodiment of the present invention provides a kind of heating method of Three-pipe heat recovery multi-connected machine system, comprising:
S1: cross valve powers on, opens the first electric expansion valve and the second electric expansion valve, closes the first magnetic valve and the second magnetic valve, opens the 3rd magnetic valve and the 4th magnetic valve;
S2: low pressure gas pipe input and the tracheae output of the first indoor-unit cooling-medium switching device shifter are closed, high-pressure air pipe input and the conducting of tracheae output;
Low pressure gas pipe input and the tracheae output of the second indoor-unit cooling-medium switching device shifter are closed, high-pressure air pipe input and the conducting of tracheae output;
S3: refrigerant process cross valve and the high-pressure air pipe stop valve of the HTHP that compressor bank is discharged, and be diverted to the high-pressure air pipe input of the first indoor-unit cooling-medium switching device shifter and the high-pressure air pipe input of the second indoor-unit cooling-medium switching device shifter by high-pressure air pipe branch pipe;
S4: be diverted to the refrigerant of the first indoor-unit cooling-medium switching device shifter, by the first indoor set condensation heat release being connected with the first indoor-unit cooling-medium switching device shifter;
Be diverted to the refrigerant of the second indoor-unit cooling-medium switching device shifter, by the second indoor set condensation heat release being connected with the second indoor-unit cooling-medium switching device shifter;
S5: the refrigerant after the first indoor set and the second indoor set condensation heat release collaborates by liquid pipe branch pipe, a refrigerant part behind interflow to the first air cooling heat exchanger evaporation endothermic, enters gas-liquid separator through the 3rd magnetic valve after evaporation endothermic after the first electric expansion valve reducing pressure by regulating flow;
Another part to the second air cooling heat exchanger evaporation endothermic, enters gas-liquid separator through the 4th magnetic valve after evaporation endothermic after the second electric expansion valve reducing pressure by regulating flow, and collaborates with the refrigerant after the first air cooling heat exchanger evaporation endothermic;
S6: gas-liquid separator is transmitted back to compressor bank by the refrigerant after evaporation endothermic after gas-liquid separation, completes and heats circulation.
A Three-pipe heat recovery multi-connected machine system, comprising:
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 and the cooling medium switching device identical with described indoor set quantity, liquid pipe stop valve, low pressure gas pipe stop valve, high-pressure air pipe stop valve, be communicated with the first magnetic valve using as condenser for controlling described the first air cooling heat exchanger with described the first air cooling heat exchanger, be communicated with the second magnetic valve using as condenser for controlling described the second air cooling heat exchanger with described the second air cooling heat exchanger, be communicated with the 3rd magnetic valve using as evaporimeter for controlling described the first air cooling heat exchanger with described the first air cooling heat exchanger, be used for controlling described the second air cooling heat exchanger as the 4th magnetic valve of evaporimeter use and the cross valve still heating for refrigeration for controlling described indoor set with described the second air cooling heat exchanger,
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 cooling medium switching device is freeze or heat for controlling the working method of described indoor set;
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, low pressure gas pipe 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 output of described indoor-unit cooling-medium switching device shifter is communicated with the liquid pipe end of described indoor set, and the liquid pipe input of described indoor-unit cooling-medium switching device shifter is communicated with described liquid pipe stop valve; The tracheae output of described indoor-unit cooling-medium switching device shifter is communicated with the tracheae end of described indoor set; The low pressure gas pipe input of described indoor-unit cooling-medium switching device shifter is communicated with described low pressure gas pipe stop valve; The high-pressure air pipe input of described indoor-unit cooling-medium switching device shifter is communicated with described high-pressure air pipe stop valve;
The input of described the first magnetic valve is communicated with described compressor bank output, and the output of described the first magnetic valve is communicated with described the first air cooling heat exchanger;
The input of described the second magnetic valve is communicated with described compressor bank output, and the output of described the second magnetic valve is communicated with described the second air cooling heat exchanger;
The input of described the 3rd magnetic valve is communicated with described the first air cooling heat exchanger and described the first magnetic valve output, the output of described the 3rd magnetic valve is communicated with described compressor bank air return end, described cross valve the 3rd end and the 4th end and described low pressure gas pipe stop valve, and described the 3rd magnetic valve is used for controlling described the first air cooling heat exchanger to be used as evaporimeter;
The input of described the 4th magnetic valve is communicated with described the second air cooling heat exchanger and described the second magnetic valve output, the output of described the 4th magnetic valve is communicated with described compressor bank air return end, described cross valve the 3rd end and the 4th end and described low pressure gas pipe stop valve, and described the 4th magnetic valve is used for controlling described the second air cooling heat exchanger to be used as evaporimeter;
The first end of described cross valve is communicated with described compressor bank output, the second end of described cross valve is communicated with described high-pressure air pipe stop valve, the 3rd end of described cross valve and the 4th end are communicated with described the 3rd magnetic valve, described the 4th magnetic valve, described low pressure gas pipe stop valve and described compressor bank air return end, and described cross valve is used for controlling described indoor set and still heats for freezing.
Preferably, also comprise the first electric expansion valve;
Described the first air cooling heat exchanger is communicated with described 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 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 the gas-liquid separator for carrying out gas-liquid separation to flowing into the refrigerant of described compressor bank;
Described gas-liquid separator is provided with input and output;
The input of described gas-liquid separator and the output of described the 3rd magnetic valve output, the 4th magnetic valve and the 3rd end of described cross valve and the 4th end are communicated with, and described gas-liquid separator output is communicated with described compressor bank air return end.
Preferably, also comprise for detection of the low-pressure sensor of pressure size between described gas-liquid separator output and described compressor bank air return end with for according to the pressure size detecting, control the low tension switch of pipeline opening and closing between described gas-liquid separator output and described compressor bank air return end;
Described low tension switch and described low-pressure sensor are arranged between described gas-liquid separator output and described compressor bank air return end.
Preferably, also comprise oil eliminator; Described oil eliminator is provided with input, refrigerant output and oily output;
Described oil eliminator input is communicated with input, the input of the second magnetic valve and the first end of described cross valve of described the first magnetic 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, 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, 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 low pressure gas pipe 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 the second indoor set; The low pressure gas pipe input of the second 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 second 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.
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 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 to heat the operational effect of interior machine, and reach 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.
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 system heating method flow chart provided by the invention;
Fig. 2 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 present embodiment provides a kind of heating method of Three-pipe heat recovery multi-connected machine system, please read shown in Fig. 1, comprising:
S1: cross valve powers on, opens the first electric expansion valve and the second electric expansion valve, closes the first magnetic valve and the second magnetic valve, opens the 3rd magnetic valve and the 4th magnetic valve;
S2: low pressure gas pipe input and the tracheae output of the first indoor-unit cooling-medium switching device shifter are closed, high-pressure air pipe input and the conducting of tracheae output;
Low pressure gas pipe input and the tracheae output of the second indoor-unit cooling-medium switching device shifter are closed, high-pressure air pipe input and the conducting of tracheae output;
S3: refrigerant process cross valve and the high-pressure air pipe stop valve of the HTHP that compressor bank is discharged, and be diverted to the high-pressure air pipe input of the first indoor-unit cooling-medium switching device shifter and the high-pressure air pipe input of the second indoor-unit cooling-medium switching device shifter by high-pressure air pipe branch pipe;
S4: be diverted to the refrigerant of the first indoor-unit cooling-medium switching device shifter, by the first indoor set condensation heat release being connected with the first indoor-unit cooling-medium switching device shifter;
Be diverted to the refrigerant of the second indoor-unit cooling-medium switching device shifter, by the second indoor set condensation heat release being connected with the second indoor-unit cooling-medium switching device shifter;
S5: the refrigerant after the first indoor set and the second indoor set condensation heat release collaborates by liquid pipe branch pipe, a refrigerant part behind interflow to the first air cooling heat exchanger evaporation endothermic, enters gas-liquid separator through the 3rd magnetic valve after evaporation endothermic after the first electric expansion valve reducing pressure by regulating flow;
Another part to the second air cooling heat exchanger evaporation endothermic, enters gas-liquid separator through the 4th magnetic valve after evaporation endothermic after the second electric expansion valve reducing pressure by regulating flow, and collaborates with the refrigerant after the first air cooling heat exchanger evaporation endothermic;
S6: gas-liquid separator is transmitted back to compressor bank by the refrigerant after evaporation endothermic after gas-liquid separation, completes and heats circulation.
Further combined with Fig. 2, Three-pipe heat recovery multi-connected machine system heats process and specifically comprises: cross valve 11 powers on, the first electric expansion valve 12, the second electric expansion valve 13 are opened, and close the first magnetic valve 7 and the second magnetic valve 8, open the 3rd magnetic valve 9 and the 4th magnetic valve 10; The low pressure gas pipe input 30D of the first indoor-unit cooling-medium switching device shifter 30 and tracheae output 30B close, high-pressure air pipe input 30E and tracheae output 30B conducting; The low pressure gas pipe input 30D of the second indoor-unit cooling-medium switching device shifter 31 and tracheae output 30B close, high-pressure air pipe input 30E and tracheae output 30B conducting.
The refrigerant of the HTHP that compressor bank 1 is discharged through cross valve 11 to after high-pressure air pipe stop valve 17 by the high-pressure air pipe input 30E of the first indoor-unit cooling-medium switching device shifter 30 and the high-pressure air pipe input 31E of the second 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 the first indoor-unit cooling-medium switching device shifter 30, to the heat exchanger of the first indoor set 40 of its connection, go after condensation heat release after the liquid pipe output 30A of the first 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 the second indoor-unit cooling-medium switching device shifter 31, to the heat exchanger of the second indoor set 41 of its connection, go after condensation heat release after the liquid pipe output 31A of the second indoor-unit cooling-medium switching device shifter 31 to liquid pipe input 31C, then two strands of refrigerants arrive 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 3rd magnetic valve 9 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 4th magnetic valve 10 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 1 completes and heats circulation, reach the object that Three-pipe heat recovery multi-connected machine system heats.
Hence one can see that, by two air cooling heat exchangers being replaced to 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 to heat the operational effect of interior machine, and reach 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.
A kind of Three-pipe heat recovery multi-connected machine system is provided in the present invention, for making goal of the invention of the present invention, feature, advantage can be more obviously with understandable, to use specific embodiment and accompanying drawing below, technical scheme to the present invention's protection is carried out clear, intactly describe, obviously, the embodiments described below are only the present invention's part embodiment, but not whole embodiment, refer to shown in Fig. 2, comprise: for the compressor of cold-producing medium is provided to system, the first air cooling heat exchanger 2 and for giving the first outdoor fan 3 of described the first air cooling heat exchanger 2 enhanced heat exchanges, the second air cooling heat exchanger 4 and for giving the second outdoor fan 5 of described the second air cooling heat exchanger semi-finals heat exchange, at least two indoor sets and the cooling medium switching device identical with described indoor set quantity, liquid pipe stop valve 15, low pressure gas pipe stop valve 16, high-pressure air pipe stop valve 17, the first magnetic valve 7, the second magnetic valve 8, the 3rd magnetic valve 9, the 4th magnetic valve 10, cross valve 11,
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 1, 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 cooling medium switching device is freeze or heat for controlling the working method of described indoor set;
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, low pressure gas pipe 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 output of described indoor-unit cooling-medium switching device shifter is communicated with the liquid pipe end of described indoor set, and the liquid pipe input of described indoor-unit cooling-medium switching device shifter is communicated with 15 with described liquid pipe stop valve; The tracheae output of described indoor-unit cooling-medium switching device shifter is communicated with the tracheae end of described indoor set; The low pressure gas pipe input of described indoor-unit cooling-medium switching device shifter is communicated with 16 with described low pressure gas pipe stop valve; The high-pressure air pipe input of described indoor-unit cooling-medium switching device shifter is communicated with 17 with described high-pressure air pipe stop valve;
The input of described the first magnetic valve 7 is communicated with described compressor bank 1 output, and the output of described the first magnetic valve 7 is communicated with described the first air cooling heat exchanger 2, and described the first magnetic valve 7 uses as condenser for controlling described the first air cooling heat exchanger 2;
The input of described the second magnetic valve 8 is communicated with described compressor bank 1 output, and the output of described the second magnetic valve 8 is communicated with described the second air cooling heat exchanger 4, and described the second magnetic valve 8 uses as condenser for controlling described the second air cooling heat exchanger 4;
The input of described the 3rd magnetic valve 9 is communicated with described the first air cooling heat exchanger 2 and described the first magnetic valve 7 outputs, the output of described the 3rd magnetic valve 9 is communicated with described compressor bank 1 air return end, described cross valve the 3rd end 11C and the 4th end 11S and described low pressure gas pipe stop valve 16, and described the 3rd magnetic valve 9 uses as evaporimeter for controlling described the first air cooling heat exchanger 2;
The input of described the 4th magnetic valve 10 is communicated with described the second air cooling heat exchanger 4 and described the second magnetic valve 10 outputs, the output of described the 4th magnetic valve 10 is communicated with described compressor bank 1 air return end, described cross valve 10 the 3rd end 11C and the 4th end 11S and described low pressure gas pipe stop valve 16, and described the 4th magnetic valve 10 uses as evaporimeter for controlling described the second air cooling heat exchanger 4;
The first end 11D of described cross valve 10 is communicated with described compressor bank 1 output, the second end 11E of described cross valve is communicated with described high-pressure air pipe stop valve 17, the 3rd end 11C of described cross valve and the 4th end 11S are communicated with described the 3rd magnetic valve 9, described the 4th magnetic valve 10, described low pressure gas pipe stop valve 16 and described compressor bank 1 air return end, and described cross valve 11 still heats for freezing for controlling described indoor set.
In the present embodiment, 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.It is most important that the cold medium flux of the first air cooling heat exchanger 2 and the second air cooling heat exchanger 4 is flow through in control.Three-pipe heat recovery multi-connected machine system also comprises the first electric expansion valve 12; Described the first air cooling heat exchanger 2 is communicated with described liquid pipe stop valve 15 by described the first electric expansion valve 12, and described the first electric expansion valve 12 is for controlling the cold medium flux that flows through described the first air cooling heat exchanger 2.
Also comprise the second electric expansion valve 13; Described the second air cooling heat exchanger 4 is communicated with described liquid pipe stop valve 15 by described the second electric expansion valve 13, and described the second electric expansion valve 12 is for controlling the cold medium flux that flows through described the second air cooling heat exchanger 4.
In the present embodiment, Three-pipe heat recovery multi-connected machine system also comprises for carry out the gas-liquid separator 14 of gas-liquid separation to flowing into the refrigerant of described compressor bank 1; Described gas-liquid separator 14 is provided with input and output;
The input of described gas-liquid separator 14 is communicated with described the 3rd magnetic valve 9 outputs, the output of the 4th magnetic valve 10 and the 3rd end 11C of described cross valve and the 4th end 11S, and described gas-liquid separator 14 outputs are communicated with described compressor bank 1 air return end.
Between described gas-liquid separator output and described compressor bank 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.
In the present embodiment, Three-pipe heat recovery multi-connected machine system also comprises oil eliminator 6; Described oil eliminator is provided with input 6A, refrigerant output 6B and oily output 6C;
Described oil eliminator input 6A is communicated with the first end 11D of the input of described the first magnetic valve 7, the input of the second magnetic valve 8 and described cross valve 11;
The oily output 6C of described oil eliminator 6 is provided with the air return end of described compressor bank 1 and is communicated with capillary 24;
Described capillary 24 is for carrying out separated to flowing out the high-pressure gaseous refrigerant of compressor bank 1 with refrigerator oil, the refrigerant output 6B of high-pressure gaseous refrigerant by described oil eliminator 6 discharged, capillary 24 by isolated refrigerator oil by described oil eliminator 6 oily outputs flows back to described compressor bank 1, and described capillary 24 is for controlling the oil drain quantity of oil eliminator 6.
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.
In the present embodiment, Three-pipe heat recovery multi-connected machine system is provided with the first indoor set 40, the second indoor set 41, and the first cooling medium switching device 30 being connected with described the first indoor set 40 and the second cooling medium switching device 31 of being connected with described the second indoor set 41;
Also comprise: liquid pipe branch pipe 50, low pressure gas pipe branch pipe 51, high-pressure air pipe branch pipe 52;
The liquid pipe output 30A of described the first indoor-unit cooling-medium switching device shifter 30 is communicated with the liquid pipe end 40A of described the first indoor set 40, and the liquid pipe input 30C of described the first indoor-unit cooling-medium switching device shifter 30 is communicated with described off-premises station liquid pipe stop valve 15 by described liquid pipe branch pipe 50; The low pressure gas pipe output 30B of the first indoor-unit cooling-medium switching device shifter 30 is communicated with the tracheae end 40B of described the first indoor set 40; The low pressure gas pipe input 30D of the first indoor-unit cooling-medium switching device shifter 30 is communicated with described off-premises station low pressure gas pipe stop valve 16 by low pressure gas pipe branch pipe 51; The high-pressure air pipe input 30E of the first indoor-unit cooling-medium switching device shifter 30 is communicated with the high-pressure air pipe stop valve 17 of described off-premises station by described high-pressure air pipe branch pipe 52;
The liquid pipe output 31A of described the second indoor-unit cooling-medium switching device shifter 31 is communicated with the liquid pipe end 41A of described the second indoor set 41, and the liquid pipe input 31C of described the second indoor-unit cooling-medium switching device shifter 31 is communicated with the liquid pipe stop valve 15 of described off-premises station by described liquid pipe branch pipe 50; The tracheae output 31B of the second indoor-unit cooling-medium switching device shifter 31 is communicated with the tracheae end 41B of described the second indoor set 41; The low pressure gas pipe input 31D of the second indoor-unit cooling-medium switching device shifter 31 is communicated with described off-premises station low pressure gas pipe stop valve 16 by low pressure gas pipe branch pipe 51; The high-pressure air pipe input 31E of the second indoor-unit cooling-medium switching device shifter 31 is communicated with the high-pressure air pipe stop valve 17 of described off-premises station by described high-pressure air pipe branch pipe 52.
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.
In the present embodiment, Three-pipe heat recovery multi-connected machine system is when whole indoor sets all freezes, the first magnetic valve 7 powers on, the second magnetic valve 8 powers on, the 3rd magnetic valve 9 power down, the 4th magnetic valve 10 power down, the first electric expansion valve 11 and the second electric expansion valve 12 are opened under the control of electric-control system, cross valve 11 power down, by the low pressure gas pipe input 30D of the first 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 30D of the second indoor-unit cooling-medium switching device shifter 31 and tracheae output 30B conducting, high-pressure air pipe input 30E and tracheae output 30B close, a refrigerant part for the HTHP that compressor bank 1 is discharged after the first magnetic 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 magnetic 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 the first indoor-unit cooling-medium switching device shifter 30 and the liquid pipe input 31C of the second indoor-unit cooling-medium switching device shifter 31 to 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 the first indoor-unit cooling-medium switching device shifter 30 to after the heat exchanger devaporation heat absorption of the first indoor set 40 of its connection after the tracheae output 30B of the first 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 the second indoor-unit cooling-medium switching device shifter 31 to after the heat exchanger devaporation heat absorption of the second indoor set 41 of its connection after the tracheae output 31B of the first 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 cross valve 11 power down, the first end 11D of 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 cross valve 11 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 can improve machine in reliability that system heats at cryogenic refrigeration, high temperature and part open refrigeration and partly in machine to open the detailed 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 magnetic valve 7 of Three-pipe heat recovery multi-connected machine system powers on, the second magnetic valve 8 power down, the 3rd magnetic valve 9 power down, the 4th magnetic valve 10 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, cross valve 11 power down, by the low pressure gas pipe input 30D of the first indoor-unit cooling-medium switching device shifter 30 and tracheae output 30B conducting, high-pressure air pipe input 30E and tracheae output 30B close, simultaneously by the low pressure gas pipe input 31D of the second indoor-unit cooling-medium switching device shifter 31 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 magnetic 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 the first indoor-unit cooling-medium switching device shifter 30 and the liquid pipe input 31C of the second indoor-unit cooling-medium switching device shifter 31 after liquid pipe stop valve 15 after 50 shuntings of liquid side branch pipe, through the refrigerant of the liquid pipe input 30C of the first indoor-unit cooling-medium switching device shifter 30 to after the heat exchanger devaporation heat absorption of the first indoor set 40 of its connection after the tracheae output 30B of the first 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 the second indoor-unit cooling-medium switching device shifter 31 to after the heat exchanger devaporation heat absorption of the second indoor set 41 of its connection after the tracheae output 31B of the second 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 electric expansion valve 13 is closed, and the second magnetic valve 8 cuts out, and the 4th magnetic valve 10 is opened, refrigerant in the second air cooling heat exchanger 4 is got back to gas-liquid separator 14 after the 4th magnetic valve 10, and 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 magnetic valve 7 of Three-pipe heat recovery multi-connected machine system powers on, the second magnetic valve 8 power down, the 3rd magnetic valve 9 power down, the 4th magnetic valve 10 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, cross valve 11 power down, by the low pressure gas pipe input 30D of the first indoor-unit cooling-medium switching device shifter 30 and tracheae output 30B conducting, high-pressure air pipe input 30E and tracheae output 30B close, simultaneously by the low pressure gas pipe input 31D of the second indoor-unit cooling-medium switching device shifter 31 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 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 magnetic valve 8, in addition a part of refrigerant by 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 the first indoor-unit cooling-medium switching device shifter 30 and the liquid pipe input 31C of the second indoor-unit cooling-medium switching device shifter 31, through the refrigerant of the liquid pipe input 30C of the first indoor-unit cooling-medium switching device shifter 30 to after the heat exchanger devaporation heat absorption of the first indoor set 40 of its connection after the tracheae output 30B of the first 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 the second indoor-unit cooling-medium switching device shifter 31 to after the heat exchanger devaporation heat absorption of the second indoor set 41 of its connection after the tracheae output 31B of the second 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 magnetic valve 7 of Three-pipe heat recovery multi-connected machine system powers on, the second magnetic valve 8 power down, the 3rd magnetic valve 9 power down, the 4th magnetic valve 10 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, cross valve 11 powers on, electric-control system is by the low pressure gas pipe input 30D of the first 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 the second 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 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 the second 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 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 magnetic valve 7 to the common port that reaches 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 magnetic 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 indoor set 40, 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:
Between described gas-liquid separator output and described compressor bank 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 the present invention, 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 magnetic valve 7, the second magnetic valve 8, the 3rd magnetic valve 9 and the 4th magnetic valve 10 can be all identical or entirely not identical, or incomplete same, do not limit herein.
The model of two platforms or many indoor sets is identical or different, does not limit herein.
The model of two or more indoor-unit cooling-medium switching device shifters is identical or different, does not limit herein.
In the present embodiment, described compressor adopts frequency-changeable compressor, or constant speed compressor, or digital compressor.
In this description, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.
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 (10)

1. a heating method for Three-pipe heat recovery multi-connected machine system, is characterized in that, comprising:
S1: cross valve powers on, opens the first electric expansion valve and the second electric expansion valve, closes the first magnetic valve and the second magnetic valve, opens the 3rd magnetic valve and the 4th magnetic valve;
S2: low pressure gas pipe input and the tracheae output of the first indoor-unit cooling-medium switching device shifter are closed, high-pressure air pipe input and the conducting of tracheae output;
Low pressure gas pipe input and the tracheae output of the second indoor-unit cooling-medium switching device shifter are closed, high-pressure air pipe input and the conducting of tracheae output;
S3: refrigerant process cross valve and the high-pressure air pipe stop valve of the HTHP that compressor bank is discharged, and be diverted to the high-pressure air pipe input of the first indoor-unit cooling-medium switching device shifter and the high-pressure air pipe input of the second indoor-unit cooling-medium switching device shifter by high-pressure air pipe branch pipe;
S4: be diverted to the refrigerant of the first indoor-unit cooling-medium switching device shifter, by the first indoor set condensation heat release being connected with the first indoor-unit cooling-medium switching device shifter;
Be diverted to the refrigerant of the second indoor-unit cooling-medium switching device shifter, by the second indoor set condensation heat release being connected with the second indoor-unit cooling-medium switching device shifter;
S5: the refrigerant after the first indoor set and the second indoor set condensation heat release collaborates by liquid pipe branch pipe, a refrigerant part behind interflow to the first air cooling heat exchanger evaporation endothermic, enters gas-liquid separator through the 3rd magnetic valve after evaporation endothermic after the first electric expansion valve reducing pressure by regulating flow;
Another part to the second air cooling heat exchanger evaporation endothermic, enters gas-liquid separator through the 4th magnetic valve after evaporation endothermic after the second electric expansion valve reducing pressure by regulating flow, and collaborates with the refrigerant after the first air cooling heat exchanger evaporation endothermic;
S6: gas-liquid separator is transmitted back to compressor bank by the refrigerant after evaporation endothermic after gas-liquid separation, completes and heats circulation.
2. a Three-pipe heat recovery multi-connected machine system, is characterized in that, comprising:
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 and the cooling medium switching device identical with described indoor set quantity, liquid pipe stop valve, low pressure gas pipe stop valve, high-pressure air pipe stop valve, be communicated with the first magnetic valve using as condenser for controlling described the first air cooling heat exchanger with described the first air cooling heat exchanger, be communicated with the second magnetic valve using as condenser for controlling described the second air cooling heat exchanger with described the second air cooling heat exchanger, be communicated with the 3rd magnetic valve using as evaporimeter for controlling described the first air cooling heat exchanger with described the first air cooling heat exchanger, be used for controlling described the second air cooling heat exchanger as the 4th magnetic valve of evaporimeter use and the cross valve still heating for refrigeration for controlling described indoor set with described the second air cooling heat exchanger,
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 cooling medium switching device is freeze or heat for controlling the working method of described indoor set;
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, low pressure gas pipe 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 output of described indoor-unit cooling-medium switching device shifter is communicated with the liquid pipe end of described indoor set, and the liquid pipe input of described indoor-unit cooling-medium switching device shifter is communicated with described liquid pipe stop valve; The tracheae output of described indoor-unit cooling-medium switching device shifter is communicated with the tracheae end of described indoor set; The low pressure gas pipe input of described indoor-unit cooling-medium switching device shifter is communicated with described low pressure gas pipe stop valve; The high-pressure air pipe input of described indoor-unit cooling-medium switching device shifter is communicated with described high-pressure air pipe stop valve;
The input of described the first magnetic valve is communicated with described compressor bank output, and the output of described the first magnetic valve is communicated with described the first air cooling heat exchanger;
The input of described the second magnetic valve is communicated with described compressor bank output, and the output of described the second magnetic valve is communicated with described the second air cooling heat exchanger;
The input of described the 3rd magnetic valve is communicated with described the first air cooling heat exchanger and described the first magnetic valve output, the output of described the 3rd magnetic valve is communicated with described compressor bank air return end, described cross valve the 3rd end and the 4th end and described low pressure gas pipe stop valve, and described the 3rd magnetic valve is used for controlling described the first air cooling heat exchanger to be used as evaporimeter;
The input of described the 4th magnetic valve is communicated with described the second air cooling heat exchanger and described the second magnetic valve output, the output of described the 4th magnetic valve is communicated with described compressor bank air return end, described cross valve the 3rd end and the 4th end and described low pressure gas pipe stop valve, and described the 4th magnetic valve is used for controlling described the second air cooling heat exchanger to be used as evaporimeter;
The first end of described cross valve is communicated with described compressor bank output, the second end of described cross valve is communicated with described high-pressure air pipe stop valve, the 3rd end of described cross valve and the 4th end are communicated with described the 3rd magnetic valve, described the 4th magnetic valve, described low pressure gas pipe stop valve and described compressor bank air return end, and described cross valve is used for controlling described indoor set and still heats for freezing.
3. Three-pipe heat recovery multi-connected machine system according to claim 2, is characterized in that,
Also comprise the first electric expansion valve;
Described the first air cooling heat exchanger is communicated with described 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.
4. Three-pipe heat recovery multi-connected machine system according to claim 2, is characterized in that,
Also comprise the second electric expansion valve;
Described the second air cooling heat exchanger is communicated with described 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.
5. Three-pipe heat recovery multi-connected machine system according to claim 2, is characterized in that,
Also comprise the gas-liquid separator for carrying out gas-liquid separation to flowing into the refrigerant of described compressor bank;
Described gas-liquid separator is provided with input and output;
The input of described gas-liquid separator and the output of described the 3rd magnetic valve output, the 4th magnetic valve and the 3rd end of described cross valve and the 4th end are communicated with, and described gas-liquid separator output is communicated with described compressor bank air return end.
6. Three-pipe heat recovery multi-connected machine system according to claim 5, is characterized in that,
Also comprise for detection of the low-pressure sensor of pressure size between described gas-liquid separator output and described compressor bank air return end with for according to the pressure size detecting, control the low tension switch of pipeline opening and closing between described gas-liquid separator output and described compressor bank air return end;
Described low tension switch and described low-pressure sensor are arranged between described gas-liquid separator output and described compressor bank air return end.
7. Three-pipe heat recovery multi-connected machine system according to claim 2, 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 communicated with input, the input of the second magnetic valve and the first end of described cross valve of described the first magnetic 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.
8. Three-pipe heat recovery multi-connected machine system according to claim 7, 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. Three-pipe heat recovery multi-connected machine system according to claim 2, is characterized in that,
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 low pressure gas pipe 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 the second indoor set; The low pressure gas pipe input of the second 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 second 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.
10. Three-pipe heat recovery multi-connected machine system according to claim 2, is characterized in that,
Described compressor adopts frequency-changeable compressor, or constant speed compressor, or digital compressor.
CN201410440765.7A 2014-09-01 2014-09-01 The heating method of a kind of Three-pipe heat recovery multi-connected machine system and system Active CN104197570B (en)

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WO2016173497A1 (en) * 2015-04-28 2016-11-03 广东美的暖通设备有限公司 Multi-split air conditioning system and medium pressure control method thereof
CN108759008A (en) * 2018-06-12 2018-11-06 广东美的暖通设备有限公司 Control method, device and the air-conditioning with it of air-conditioning
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CN112797520A (en) * 2020-12-31 2021-05-14 青岛海信日立空调系统有限公司 Air conditioner and AHU unit temperature control method
CN112797520B (en) * 2020-12-31 2023-12-08 青岛海信日立空调系统有限公司 Air conditioner and AHU unit temperature control method
WO2023088066A1 (en) * 2021-11-17 2023-05-25 北京市京科伦冷冻设备有限公司 Multi-split central air conditioning system for simultaneous cooling and heating

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