CN104154673B - A kind of refrigerating method of Three-pipe heat recovery multi-connected machine system and system - Google Patents
A kind of refrigerating method of Three-pipe heat recovery multi-connected machine system and system Download PDFInfo
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- CN104154673B CN104154673B CN201410440777.XA CN201410440777A CN104154673B CN 104154673 B CN104154673 B CN 104154673B CN 201410440777 A CN201410440777 A CN 201410440777A CN 104154673 B CN104154673 B CN 104154673B
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The present invention discloses a kind of refrigerating method of Three-pipe heat recovery multi-connected machine system, make full use of the recuperation of heat feature of Three-pipe heat recovery multi-connected machine, input with minimum energy consumption of compressor, make full use of the heat exchange efficiency of outdoor unit heat exchanger and need any one outdoor air cooling heat exchanger of unrestricted choice to be use as condenser or evaporimeter use according to the control of system, and system high pressure and low pressure and delivery temperature and suction temperature and refrigerant are distributed to make Three-pipe heat recovery multi-connected machine system ensure under any environment temperature and any indoor set open mode by the adjustment of outdoor fan and cross valve, reduce the HTHP risk of system and return liquid risk thus ensure that the reliability of system, the reasonable distribution of system refrigerant thus ensure that refrigeration and heat the operational effect of indoor set, and reach the object of sufficient heat recovery energy-saving.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly relate to a kind of refrigerating method and system of Three-pipe heat recovery multi-connected machine system.
Background technology
Existingly to heat or refrigeration system, the air cooling heat exchanger of off-premises station or all making evaporimeter uses, or all making condenser uses.When cryogenic refrigeration, the air cooling heat exchanger of off-premises station is all used as condenser, and condensation effect may be made so very good, and evaporimeter can not evaporate completely, thus causes system to return liquid refrigerants, causes compressor to burn time serious.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, vicious circle like this is gone down, and has a strong impact on the service life of whole system.
In order to the needs adapting to user reach the refrigeration of refrigeration indoor set simultaneously, common way the output of compressor is strengthened the refrigeration of the interior machine that simultaneously ensures to freeze, but the high-low pressure pressure of system causes improper with row's suction temperature under these conditions, too high or too low and the system of system compressors pressure ratio will be caused to return liquid risk, affect the service life of whole system.
Summary of the invention
The embodiment of the present invention provides a kind of refrigerating method of Three-pipe heat recovery multi-connected machine system, comprising:
S1: open the first electric expansion valve and the second electric expansion valve, turns off the first cross valve and the second cross valve simultaneously, opens the first magnetic valve, close the second magnetic valve;
The low pressure gas pipe input of the S2: the first cooling medium switching device and the second cooling medium switching device and the conducting of tracheae output, and the high-pressure air pipe input of the first cooling medium switching device and the second cooling medium switching device and tracheae output are closed;
S3: compressor bank discharge HTHP refrigerant a part after the first cross valve after the first air cooling heat exchanger condensation through the first electric expansion valve reducing pressure by regulating flow, another part after the second cross valve after the second air cooling heat exchanger condensation through the second electric expansion valve reducing pressure by regulating flow;
Liquid refrigerants after reducing pressure by regulating flow is shunted by liquid pipe branch pipe through liquid pipe stop valve by S4: two air cooling heat exchangers, shunts to the first cooling medium switching device and the second cooling medium switching device;
S5: the liquid refrigerants being diverted to the first indoor-unit cooling-medium switching device shifter, carries out evaporation endothermic by the first indoor set be connected with the first indoor-unit cooling-medium switching device shifter;
Be diverted to the liquid refrigerants of the second indoor-unit cooling-medium switching device shifter, carry out evaporation endothermic by the second indoor set be connected with the second indoor-unit cooling-medium switching device shifter;
S6: the liquid refrigerants after the first indoor set and the second indoor set evaporation endothermic is collaborated by low pressure gas pipe branch pipe, through low pressure gas pipe stop valve, enters gas-liquid separator;
S7: gas-liquid separator is transmitted back to compressor bank after the liquid refrigerants after evaporation endothermic is carried out gas-liquid separation, completes kind of refrigeration cycle.
A kind of Three-pipe heat recovery multi-connected machine system, comprise: for providing the compressor of cold-producing medium to system, first air cooling heat exchanger and for giving the first outdoor fan of described first air cooling heat exchanger enhanced heat exchange, second air cooling heat exchanger and for giving the second outdoor fan of described second air cooling heat exchanger enhanced heat exchange, at least two indoor sets and identical with described indoor set quantity be the cooling medium switching device freezing or heat for controlling its working method connecting indoor set, liquid pipe stop valve, low pressure gas pipe stop valve, high-pressure air pipe stop valve, be connected for controlling described first air cooling heat exchanger as condenser or the first cross valve of using as evaporimeter with described first air cooling heat exchanger, be connected for controlling described second air cooling heat exchanger as condenser or the second cross valve of using as evaporimeter with described second air cooling heat exchanger, first magnetic valve and the second magnetic valve,
The quantity of described compressor is at least two, each described compressor can provide cold-producing medium to system simultaneously, and described compressor composition compressor bank, and the output of each described compressor and air return end are accumulated 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, low pressure gas pipe input, tracheae output, high-pressure air pipe input;
The liquid pipe end of described indoor set is connected with the liquid pipe output of described indoor-unit cooling-medium switching device shifter, and the tracheae end of described indoor set is connected 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 connected with described liquid pipe stop valve;
The low pressure gas pipe input of described indoor-unit cooling-medium switching device shifter is connected with described low pressure gas pipe stop valve;
The high-pressure air pipe input of described indoor-unit cooling-medium switching device shifter is connected with described high-pressure air pipe stop valve;
The first end of described first cross valve, the first end of described second cross valve are connected with described compressor bank output jointly with the input of described second magnetic valve;
Second end of described first cross valve is connected with described first air cooling heat exchanger;
3rd end of described first cross valve is connected with described compressor bank air return end with the output of the 4th end, the first magnetic valve with the 3rd end of the 4th end, described second cross valve simultaneously;
Second end of described second cross valve is connected with described second air cooling heat exchanger;
The input of described first magnetic valve is connected with described low pressure gas pipe stop valve;
The output of described second magnetic valve is connected with described high-pressure air pipe stop valve.
Preferably, the first electric expansion valve is also comprised;
Described first air cooling heat exchanger is connected with described liquid pipe stop valve by described first electric expansion valve, and described first electric expansion valve is for controlling the cold medium flux flowing through described first air cooling heat exchanger.
Preferably, the second electric expansion valve is also comprised;
Described second air cooling heat exchanger is connected with described liquid pipe stop valve by described second electric expansion valve, and described second electric expansion valve is for controlling the cold medium flux flowing through described second air cooling heat exchanger.
Preferably, the gas-liquid separator for carrying out gas-liquid separation to the refrigerant flowing into described compressor bank is also comprised;
Described gas-liquid separator is provided with entrance point and the port of export;
The entrance point of described gas-liquid separator is communicated with described first magnetic valve jointly with described first cross valve, described second cross valve; The described gas-liquid separator port of export is connected with described compressor bank air return end.
Preferably, also comprise low-pressure sensor for detecting pressure size between described gas-liquid separator output and described compressor bank air return end and for according to the pressure size detected, control the low tension switch that between described gas-liquid separator output and described compressor bank air return end, pipeline is opened and turned off;
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 oil eliminator is comprised; Described oil eliminator is provided with input, refrigerant output and oily output;
Described oil eliminator input is connected with the output of described compressor bank, and the refrigerant output of described oil eliminator is connected with described first cross valve, described second cross valve and described second magnetic valve;
The oily output of described oil eliminator is provided with the capillary be communicated with described compressor bank air return end;
The high-pressure gaseous refrigerant that described capillary is used for flowing out compressor bank is separated with refrigerator oil, high-pressure gaseous refrigerant is discharged by the refrigerant output of described oil eliminator, isolated refrigerator oil is flowed back to described compressor bank by the capillary of described oil eliminator oil output, and described capillary is for controlling the oil drain quantity of described oil eliminator.
Preferably, the refrigerant output being provided with high-pressure switch and high-pressure pressure sensor or described oil eliminator between the output of described compressor bank and described oil eliminator entrance point is provided with high-pressure switch and high-pressure pressure sensor;
Described high-pressure pressure sensor is for detecting the pressure size of the output of described compressor bank; Described high-pressure switch is used for the pressure size according to detecting, and controls described compressor bank and opens and closes.
Preferably, comprising: the first indoor set and the second indoor set and the first cooling medium switching device be connected with described second indoor set with described first indoor set respectively and described second cooling medium switching device;
Also comprise: liquid pipe branch pipe, low pressure gas pipe branch pipe, high-pressure air pipe branch pipe;
The liquid pipe output of described first indoor-unit cooling-medium switching device shifter is connected with the liquid pipe end of described first indoor set, and the liquid pipe input of described first indoor-unit cooling-medium switching device shifter is connected with described 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 connected with the tracheae end of described first indoor set; The tracheae input of the first indoor-unit cooling-medium switching device shifter is connected 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 connected 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 second indoor-unit cooling-medium switching device shifter is connected with the liquid pipe end of described second indoor set, and the liquid pipe input of described second indoor-unit cooling-medium switching device shifter is connected 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 connected 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 connected 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 connected 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 is by replacing an original air cooling heat exchanger by two air cooling heat exchangers, make full use of the recuperation of heat feature of Three-pipe heat recovery multi-connected machine, input with minimum energy consumption of compressor, make full use of the heat exchange efficiency of outdoor unit heat exchanger and need any one outdoor air cooling heat exchanger of unrestricted choice to be use as condenser or evaporimeter use according to the control of system, and system high pressure and low pressure and delivery temperature and suction temperature and refrigerant are distributed to make Three-pipe heat recovery multi-connected machine system ensure under any environment temperature and any interior machine open mode by the adjustment of outdoor fan, reduce the HTHP risk of system and return liquid risk thus ensure that the reliability of system, the reasonable distribution of system refrigerant thus ensure that the operational effect of machine in refrigeration, and reach the object of sufficient heat recovery energy-saving.Three-pipe heat recovery multi-connected machine system provided by the invention effectively improves the comfortableness of the Reliability Assurance indoor of Three-pipe heat recovery multi-connected machine system when cryogenic refrigeration.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention, be briefly described to the accompanying drawing used required in description below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of Three-pipe heat recovery multi-connected machine cooling system method provided by the invention;
Fig. 2 is Three-pipe heat recovery multi-connected machine overall system architecture figure provided by the invention.
Detailed description of the invention
For making goal of the invention of the present invention, feature, advantage can be more obvious and understandable; specific embodiment and accompanying drawing will be used below; the technical scheme of the present invention's protection is clearly and completely described; obviously; the embodiments described below are only the present invention's part embodiments, and the embodiment of not all.Based on the embodiment in this patent, those of ordinary skill in the art are not making other embodiments all obtained under creative work prerequisite, all belong to the scope of this patent protection.
In the present embodiment, refer to Fig. 1 and shown in composition graphs 2, a kind of refrigerating method of Three-pipe heat recovery multi-connected machine system be provided, specifically comprise:
S1: open the first electric expansion valve and the second electric expansion valve, turns off the first cross valve and the second cross valve simultaneously, opens the first magnetic valve, close the second magnetic valve;
Concrete, Three-pipe heat recovery multi-connected machine system is when whole indoor sets all freezes, first cross valve 7 and the second cross valve 8 power down, first electric expansion valve 12 and the second electric expansion valve 13 are opened under the control of electric-control system, first magnetic valve 18 energising is opened, and the second magnetic valve 19 power down is closed.
The low pressure gas pipe input of the S2: the first cooling medium switching device and the second cooling medium switching device and the conducting of tracheae output, and the high-pressure air pipe input of the first cooling medium switching device and the second cooling medium switching device and tracheae output are closed;
Concrete, electric-control system is by the low pressure gas pipe input 30D of the first cooling medium switching device 30 and tracheae output 30B conducting, and high-pressure air pipe input 30E and tracheae output 30B closes; The low pressure gas pipe input 31D of the second cooling medium switching device 31 and tracheae output 31B conducting, high-pressure air pipe input 31E and tracheae output 31B closes.
S3: compressor bank discharge HTHP refrigerant a part after the first cross valve after the first air cooling heat exchanger condensation through the first electric expansion valve reducing pressure by regulating flow, another part after the second cross valve after the second air cooling heat exchanger condensation through the second electric expansion valve reducing pressure by regulating flow;
Concrete, compressor bank 1 discharge HTHP refrigerant a part after the first cross valve 7 after the first air cooling heat exchanger 2 condensation through the first electric expansion valve 11 reducing pressure by regulating flow, a part after the second cross valve 8 after the second air cooling heat exchanger 4 condensation through the second electric expansion valve 12 reducing pressure by regulating flow.
Liquid refrigerants after reducing pressure by regulating flow is shunted by liquid pipe branch pipe through liquid pipe stop valve by S4: two air cooling heat exchangers, shunts to the first cooling medium switching device and the second cooling medium switching device;
Divide after the shunting of liquid pipe branch pipe 50 after liquid refrigerants after two air cooling heat exchanger reducing pressure by regulating flows to liquid pipe stop valve 15 and be clipped to the liquid pipe input 30C of the first cooling medium switching device 30 and liquid pipe input 31C of the second cooling medium switching device 31.
S5: the liquid refrigerants being diverted to the first indoor-unit cooling-medium switching device shifter, carries out evaporation endothermic by the first indoor set be connected with the first indoor-unit cooling-medium switching device shifter;
Be diverted to the liquid refrigerants of the second indoor-unit cooling-medium switching device shifter, carry out evaporation endothermic by the second indoor set be connected with the second indoor-unit cooling-medium switching device shifter;
Branch to the liquid refrigerants of the first cooling medium switching device 30 liquid pipe input 30C, be transferred to the first indoor set 40 by the liquid pipe output 30B of the first cooling medium switching device 30;
Branch to the liquid refrigerants of the second cooling medium switching device 31 liquid pipe input 31C, be transferred to the second indoor set 41 by the liquid pipe output 31B of the second cooling medium switching device 31.
S6: the liquid refrigerants after the first indoor set and the second indoor set evaporation endothermic is collaborated by low pressure gas pipe branch pipe, through low pressure gas pipe stop valve, enters gas-liquid separator;
S7: gas-liquid separator is transmitted back to compressor bank after the liquid refrigerants after evaporation endothermic is carried out gas-liquid separation, completes kind of refrigeration cycle.
The liquid refrigerants flowed out from the first machine cooling medium switching device 30 and the second machine cooling medium switching device 31 collaborates to get back to gas-liquid separator 14 to low pressure gas pipe stop valve 16 by low pressure gas pipe branch pipe 51, 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 can thus be appreciated that, by two air cooling heat exchangers are replaced an original air cooling heat exchanger, make full use of the recuperation of heat feature of Three-pipe heat recovery multi-connected machine, input with minimum energy consumption of compressor, make full use of the heat exchange efficiency of outdoor unit heat exchanger and need any one outdoor air cooling heat exchanger of unrestricted choice to be use as condenser or evaporimeter use according to the control of system, and system high pressure and low pressure and delivery temperature and suction temperature and refrigerant are distributed to make Three-pipe heat recovery multi-connected machine system ensure under any environment temperature and any interior machine open mode by the adjustment of outdoor fan, reduce the HTHP risk of system and return liquid risk thus ensure that the reliability of system, the reasonable distribution of system refrigerant thus ensure that the operational effect of machine in refrigeration, and reach the object of sufficient heat recovery energy-saving.Three-pipe heat recovery multi-connected machine system provided by the invention effectively improves the comfortableness of the Reliability Assurance indoor of Three-pipe heat recovery multi-connected machine system when cryogenic refrigeration.
The present invention also provides a kind of Three-pipe heat recovery multi-connected machine system; refer to shown in Fig. 2; for making goal of the invention of the present invention, feature, advantage can be more obvious and understandable; specific embodiment and accompanying drawing will be used below, the technical scheme of the present invention's protection will be clearly and completely described.
Three-pipe heat recovery multi-connected machine system comprises in the present embodiment: for providing the compressor of cold-producing medium to system, first air cooling heat exchanger 2 and for giving the first outdoor fan 3 of described first air cooling heat exchanger 2 enhanced heat exchange, second air cooling heat exchanger 4 and for giving the second outdoor fan 5 of described second air cooling heat exchanger semi-finals heat exchange, at least two indoor sets and identical with described indoor set quantity be the cooling medium switching device freezing or heat for controlling its working method connecting indoor set, liquid pipe stop valve 15, low pressure gas pipe stop valve 16, high-pressure air pipe stop valve 17, be connected for controlling described first air cooling heat exchanger 2 as condenser or the first cross valve 7 of using as evaporimeter with described first air cooling heat exchanger 2, be connected for controlling described second air cooling heat exchanger 4 as condenser or the second cross valve 8 of using as evaporimeter with described second air cooling heat exchanger 4, first magnetic valve 18 and the second magnetic valve 19,
The quantity of described compressor is at least two, each described compressor can provide cold-producing medium to system simultaneously, and described compressor composition compressor bank 1, and the output of each described compressor and air return end are accumulated 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, low pressure gas pipe input, tracheae output, high-pressure air pipe input;
The liquid pipe end of described indoor set is connected with the liquid pipe output of described indoor-unit cooling-medium switching device shifter, and the tracheae end of described indoor set is connected 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 connected with described liquid pipe stop valve;
The low pressure gas pipe input of described indoor-unit cooling-medium switching device shifter is connected with described low pressure gas pipe stop valve;
The high-pressure air pipe input of described indoor-unit cooling-medium switching device shifter is connected with described high-pressure air pipe stop valve;
The first end of described first cross valve 7, the first end of described second cross valve 8 are connected with described compressor bank 1 output jointly with the input of described second magnetic valve 19;
Second end of described first cross valve 7 is connected with described first air cooling heat exchanger 2;
3rd end of described first cross valve 7 is connected with described compressor bank 1 air return end with the output of the 4th end, the first magnetic valve 18 with the 3rd end of the 4th end, described second cross valve 8 simultaneously;
Second end of described second cross valve 8 is connected with described second air cooling heat exchanger 4;
The input of described first magnetic valve 18 is connected with described low pressure gas pipe stop valve 16;
The output of described second magnetic valve 19 is connected with described high-pressure air pipe stop valve 17.
In the present embodiment, comprising: the first indoor set 40 and the second indoor set 41 and the first cooling medium switching device 30 be connected with described second indoor set 41 with described first indoor set 40 respectively and described second cooling medium switching device 31;
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 the first cooling medium switching device 30 follows the liquid pipe end 40A of the first indoor set 40 to connect, and the liquid pipe input 30C of the first cooling medium switching device 30 is connected with liquid pipe stop valve 15 by liquid pipe branch pipe 50; The tracheae output 30B of the first cooling medium switching device 30 follows the tracheae end 40B of the first indoor set 40 to connect; The low pressure gas pipe input 30D of the first cooling medium switching device 30 is connected with 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 cooling medium switching device 30 is connected with high-pressure air pipe stop valve 17 by high-pressure air pipe branch pipe 52; First cooling medium switching device 30 still heats for freezing for the first indoor set 40 controlling its connection;
The liquid pipe output 31A of the second cooling medium switching device 31 follows the liquid pipe end 41A of indoor set 41 to connect, and the liquid pipe input 31C of the second indoor-unit cooling-medium switching device shifter 31 is connected with liquid pipe stop valve 15 by liquid pipe branch pipe 50; The tracheae output 31B of the second cooling medium switching device 31 follows the tracheae end 41B of the second indoor set 41 to connect; The low pressure gas pipe input 30D of the first indoor-unit cooling-medium switching device shifter 30 is connected with 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 cooling medium switching device 30 is connected with high-pressure air pipe stop valve 17 by high-pressure air pipe branch pipe 52; Second cooling medium switching device 31 still heats for freezing for the second indoor set 41 controlling its connection.
It should be noted that, use cross valve version can be selected in indoor-unit cooling-medium switching device shifter (such as above-mentioned first cooling medium switching device 30, second cooling medium switching device 31) inside, also can select by magnetic valve or electric expansion valve form, its final function is: liquid pipe input and the liquid pipe output of indoor-unit cooling-medium switching device shifter are conductings always, if its indoor set connected is refrigeration, the low pressure gas pipe input of indoor-unit cooling-medium switching device shifter and the conducting of tracheae output, high-pressure air pipe input and the not conducting of tracheae output; If its indoor set connected is for heating, the low pressure gas pipe input of indoor-unit cooling-medium switching device shifter and the not conducting of tracheae output, high-pressure air pipe input and the conducting of tracheae output.
In the present embodiment, the first electric expansion valve 12 is also comprised; Described first air cooling heat exchanger 2 is connected with described liquid pipe stop valve 15 by described first electric expansion valve 12, and described first electric expansion valve 12 is for controlling the cold medium flux flowing through described first air cooling heat exchanger 2.
Also comprise the second electric expansion valve 13; Described second air cooling heat exchanger 4 is connected with described liquid pipe stop valve 15 by described second electric expansion valve 13, and described second electric expansion valve 13 is for controlling the cold medium flux flowing through described second air cooling heat exchanger 4.
In the present embodiment, gas-liquid separator 14 is also comprised; Described gas-liquid separator 14 is provided with entrance point and the port of export; The entrance point of described gas-liquid separator 14 is communicated with described first magnetic valve 18 jointly with described first cross valve 7, described second cross valve 8; Described gas-liquid separator 14 port of export is connected with described compressor bank 1 air return end.
Also comprise oil eliminator 6; Described oil eliminator 6 is provided with input, refrigerant output and oily output; Described oil eliminator 6 input is connected with the output of described compressor bank 1, and the refrigerant output of described oil eliminator 6 is connected with described first cross valve 7, described second cross valve 8 and described second magnetic valve 19; The oily output of described oil eliminator 6 is provided with capillary, and is connected by the air return end of described capillary with described compressor bank 1.
Oil eliminator 6 is for being separated with compressor and freeze machine oil the gaseous coolant of the exhaust outlet flowing out compressor bank 1 or parallel connection compressor, high-pressure gaseous refrigerant is discharged by the refrigerant output 6B of oil eliminator, isolated compressor and freeze machine oil is discharged to have by the oily output 6C of oil eliminator and is got 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, also comprise the control system run for controlling Three-pipe heat recovery multi-connected machine system equipment, 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 refrigerant sequence of Three-pipe heat recovery multi-connected machine system and heat program.Control system is by internal processor, and perform the program of setting, processor here can adopt microcontroller or single-chip microcomputer.Concrete execution refrigerant sequence and heat program and can be selected by user.After user selects the performing a programme of Three-pipe heat recovery multi-connected machine system, system performs according to the program of setting, and performing a programme and the control mode of concrete control system do not limit here.
In order to illustrate that in the present embodiment, Three-pipe heat recovery multi-connected machine system is as follows at the embodiment that the loop control of freezing and heat is concrete more fully:
Three-pipe heat recovery multi-connected machine system is when whole indoor sets all freezes, first cross valve 7 and the second cross valve 8 power down, first electric expansion valve 12 and the second electric expansion valve 13 are opened under the control of electric-control system, first magnetic valve 18 powers on and opens, second magnetic valve 19 power down is closed, electric-control system is by the low pressure gas pipe input of the first cooling medium switching device 30 and the second cooling medium switching device 31 and the conducting of tracheae output, and high-pressure air pipe input and tracheae output are closed.Compressor bank 1 discharge HTHP refrigerant a part after the first cross valve 7 after the first air cooling heat exchanger 2 condensation through the first electric expansion valve 12 reducing pressure by regulating flow, a part after the second cross valve 8 after the second air cooling heat exchanger 4 condensation through the second electric expansion valve 13 reducing pressure by regulating flow, divide after the shunting of liquid pipe branch pipe 50 after liquid refrigerants after two air cooling heat exchanger reducing pressure by regulating flows to liquid pipe stop valve 15 and be clipped to the liquid pipe input 30C of the first cooling medium switching device 30 and liquid pipe input 31C of the second cooling medium switching device 31, branch to the liquid refrigerants of the first cooling medium switching device 30 liquid pipe input 30C, the first indoor set 40 is transferred to by the liquid pipe output 30B of the first cooling medium switching device 30, through the liquid refrigerants of the first indoor set 40 after the evaporation endothermic of First Heat Exchanger, the tracheae output entering the first machine cooling medium switching device 30 enters the first machine cooling medium switching device 30 and is flowed out by the low pressure gas pipe input of the first machine cooling medium switching device 30, through the liquid refrigerants of the second indoor set 41 after the evaporation endothermic of the second indoor set 41 heat exchanger 41, the tracheae output entering the second machine cooling medium switching device 31 enters the second machine cooling medium switching device 31 and is flowed out by the low pressure gas pipe input of the second machine cooling medium switching device 31, the liquid refrigerants flowed out from the first machine cooling medium switching device 30 and the second machine cooling medium switching device 31 collaborates to get back to gas-liquid separator 14 to low pressure gas pipe stop valve 16 by low pressure gas pipe branch pipe 51, 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.
In the present embodiment, Three-pipe heat recovery multi-connected machine system uses and heats, it is concrete when whole indoor sets all heats, first magnetic valve 18 power down is closed, second magnetic valve 19 powers on and opens, first electric expansion valve 12, second electric expansion valve 13 is opened under the control of electric-control system, first cross valve 7, second cross valve 8 powers on, the low pressure gas pipe input of the first cooling medium switching device 30 and the second cooling medium switching device 31 and tracheae output are closed by electric-control system, high-pressure air pipe input and the conducting of tracheae output.The refrigerant of the HTHP that compressor bank 1 the is discharged high-pressure air pipe input 30E of the first cooling medium switching device 30 and high-pressure air pipe input 31E of the second machine cooling medium switching device 31 respectively after being shunted by high-pressure air pipe branch pipe 52 after the second magnetic valve 19 to high-pressure air pipe stop valve 17, the heat exchanger of the first indoor set 40 connected to it through the refrigerant of the high-pressure air pipe input 30E of the first cooling medium switching device 30 to go after condensation heat release after the liquid pipe output 30A of the first cooling medium switching device 30 to liquid pipe input 30C, the heat exchanger of the second indoor set 41 connected to it through the refrigerant of the high-pressure air pipe input 31E of the second cooling medium switching device 31 to go after condensation heat release after the liquid pipe output 31A of the second cooling medium switching device 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 gets back to gas-liquid separator 14 through the first cross valve 7 after the first electric expansion valve 12 reducing pressure by regulating flow after the first air cooling heat exchanger 2 evaporation endothermic, a part gets back to gas-liquid separator 14 through the second cross valve 8 after the second electric expansion valve 13 reducing pressure by regulating flow after the second air cooling heat exchanger 4 evaporation endothermic, finally get back to compressor bank 1 to complete and heat 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 in the first cross valve 7, 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 in the second cross valve 8, only flows through a small amount of refrigerant and gets back to gas-liquid separator 14 through capillary 24.
In the present embodiment, Three-pipe heat recovery multi-connected machine system cryogenic refrigeration, high temperature heat and in part machine open refrigeration and partly under machine leaves the condition of heating, there is reliability and comfortableness, and defrosting is can be good at when low-temperature heating, so system has good reliability, can ensure that Three-pipe heat recovery multi-connected machine system is normally run.
In the present embodiment, cryogenic refrigeration detailed process is as follows: Three-pipe heat recovery multi-connected machine system is when cryogenic refrigeration, if whole indoor sets all opens refrigeration, air-cooled side environment temperature is low, two air cooling heat exchangers are without the need to all making condenser, now, an air cooling heat exchanger can be closed, such as close the second air cooling heat exchanger 4, first cross valve 7 power down of Three-pipe heat recovery multi-connected machine system, second cross valve 8 powers on, first electric expansion valve 12 is opened under the control of electric-control system, second electric expansion valve 13 is closed, first magnetic valve 18 powers on and opens, second magnetic valve 19 power down is closed, electric-control system is by the low pressure gas pipe input 30D of the first cooling medium switching device 30 and tracheae output 30B conducting, high-pressure air pipe input 30E and tracheae output 30B closes, the low pressure gas pipe input 31D of the second cooling medium switching device 31 and tracheae output 31B conducting, high-pressure air pipe input 31E and tracheae output 31B closes.Compressor bank 1 discharge HTHP refrigerant all after the first cross valve 7 after the first air cooling heat exchanger 2 condensation through the first electric expansion valve 12 reducing pressure by regulating flow, divide after the shunting of liquid pipe branch pipe 50 after liquid refrigerants after reducing pressure by regulating flow to liquid pipe stop valve 15 and be clipped to the liquid pipe input 30C of the first cooling medium switching device 30 and liquid pipe input 31C of the second cooling medium switching device 31, after the heat exchanger devaporation heat absorption of the first indoor set 40 connected to it through the refrigerant of the liquid pipe input 30C of the first cooling medium switching device 30 after the tracheae output 30B of the first cooling medium switching device 30 to low pressure gas pipe input 30D, after the heat exchanger devaporation heat absorption of the second indoor set 41 connected to it through the refrigerant of the liquid pipe input 31C of the second cooling medium switching device 31 after the tracheae output 31B of the second cooling medium switching device 31 to low pressure gas pipe input 31D, then two strands of refrigerants get 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 ensure that the system reliability of freezing at low ambient temperatures simultaneously.
It should be noted that: because the second cross valve 8 powers on, second electric expansion valve 13 is closed, the HTHP refrigerant that compressor bank 1 is discharged is fallen by capillary pipe plug in the second cross valve 8, the excessively a small amount of refrigerant of refrigeration stream gets back to gas-liquid separator 13 through capillary, and the refrigerant in the second air cooling heat exchanger 4 gets back to gas-liquid separator 13 after the second cross valve 8, be namely equivalent to not circulate in the second air cooling heat exchanger 4 refrigerant.
In the present embodiment, Three-pipe heat recovery multi-connected machine system opens refrigeration at part indoor set, when part indoor set is opened and is heated, such as the first indoor set 40 opens refrigeration, second indoor set 41 is opened and is heated, according to heat balance and the Stress control needs of system, the air cooling heat exchanger part of off-premises station needs to make condenser, part needs to make evaporimeter, such as using the first air cooling heat exchanger 2 as condenser, 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, second cross valve 8 powers on, first electric expansion valve 12 is opened under the control of electric-control system, second electric expansion valve 13 is opened under the control of electric-control system, first magnetic valve 18 powers on and opens, second magnetic valve 19 powers on and opens, 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 closes.The low pressure gas pipe input 31D of the second cooling medium switching device 31 and tracheae output 31B is closed, high-pressure air pipe input 31E and tracheae output 31B conducting.Compressor bank 1 discharge HTHP refrigerant a part after the second magnetic valve 19 to high-pressure air pipe stop valve 17 again after high-pressure air pipe 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, condensation heat release in refrigerant to 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 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 is arrived, HTHP refrigerant a part of common port reaching 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 cross valve 7 after the first air cooling heat exchanger 2 condensation after the first electric expansion valve 12 in addition that compressor bank 1 is discharged, the condensed refrigerant of two-way collaborates rear portion after the second electric expansion valve 13 to the second air cooling heat exchanger 4 evaporation endothermic, then gas-liquid separator 14 is finally got back to through the second cross valve 8, 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 after completing evaporation endothermic in the first indoor set 40, due to liquid pipe output 30B and the low pressure gas pipe input 30D conducting of 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, after the first magnetic valve 18, gas-liquid separator 14 is got back to again after low pressure gas pipe stop valve 16, 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 ensure that system operation reliability at low ambient temperatures simultaneously.
It should be noted that, in order to the heating effect of the refrigeration and the second indoor set 41 that ensure the first indoor set 40, the balance that the caloric requirement of system is certain, make full use of the recuperation of heat feature of Three-pipe heat recovery multi-connected machine, power consumption is inputted with minimum compressor bank 1, by using outdoor air cooling heat exchanger part as condenser, part is as evaporimeter, and the air quantity of the Flow-rate adjustment and the first outdoor fan 3 and the second outdoor fan 5 of passing through the first electric expansion valve 12 and the second electric expansion valve 13 regulates, reach and input with minimum compressor power consumption, ensure that the refrigeration of machine in refrigeration and heat the heating effect of interior machine, both ensure that the comfortableness of user also reached the object of abundant heat recovery energy-saving, outdoor fan simultaneously, electric expansion valve, the adjustment of outdoor air cooling heat exchanger coordinates, the pressure and temperature control of system is in rational scope, also ensure that the reliability of system.
In the present embodiment, Three-pipe heat recovery multi-connected machine system can realize low-temperature heating.Concrete, 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 see 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 (first air cooling heat exchanger 2 and the second air cooling heat exchanger 4) are defrosted simultaneously, the first indoor set 40, second indoor set 41 can be caused to blow a cold wind over or do not dry, have influence on Three-pipe heat recovery multi-connected machine system like this can not continue to heat, and then affect the comfortableness of user.When air cooling heat exchanger needs defrost, can defrost as condenser by an air cooling heat exchanger, another air cooling heat exchanger as evaporimeter, thus ensures that systems stay heats.Wherein, the air cooling heat exchanger when process of air cooling heat exchanger defrost is shown in that Three-pipe heat recovery multi-connected machine system high temperature heats makees condenser, an air cooling heat exchanger does the process of evaporimeter, when also can be Three-pipe heat recovery multi-connected machine system hypothermia refrigeration, an air cooling heat exchanger makees condenser, an air cooling heat exchanger does the process of evaporimeter, repeats no more herein.
With reference to above various running status, can repeat no more in the ruuning situation of Three-pipe heat recovery multi-connected machine system under other environment temperatures and indoor set open refrigeration or heating mode herein.
In summary it can be seen, the present invention is by replacing an original air cooling heat exchanger by two air cooling heat exchangers, make full use of the recuperation of heat feature of Three-pipe heat recovery multi-connected machine, input with minimum energy consumption of compressor, make full use of the heat exchange efficiency of outdoor unit heat exchanger and need any one outdoor air cooling heat exchanger of unrestricted choice to be use as condenser or evaporimeter use according to the control of system, and system high pressure and low pressure and delivery temperature and suction temperature and refrigerant are distributed to make Three-pipe heat recovery multi-connected machine system ensure under any environment temperature and any interior machine open mode by the adjustment of outdoor fan and electric expansion valve, reduce the HTHP risk of system and return liquid risk thus ensure that the reliability of system, the reasonable distribution of system refrigerant thus ensure that refrigeration and 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 at low-temperature heating, when needing defrost after the frosting of off-premises station air cooling heat exchanger, by an air cooling heat exchanger is done condenser defrost, air cooling heat exchanger makees evaporimeter and provides and continue to heat, meet unit can continue to provide the demand heated, thus ensure that the comfort level of user.Therefore, Three-pipe heat recovery multi-connected machine system provided by the invention effectively improves the integrity problem of Three-pipe heat recovery multi-connected machine system when cryogenic refrigeration, high temperature heat and the indoor comfort during the defrosting of low-temperature heating needs.
It will be appreciated by persons skilled in the art that 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, the present invention is for ensureing that Three-pipe heat recovery multi-connected machine system stability runs reliably.
In the present embodiment: Three-pipe heat recovery multi-connected machine system also comprises low-pressure sensor 20 for detecting pressure size between described gas-liquid separator 14 output and described compressor bank 1 air return end and for according to the pressure size detected, controls the low tension switch 21 that between described gas-liquid separator 14 output and described compressor bank 1 air return end, pipeline is opened and turned off;
Described low tension switch 21 and described low-pressure sensor 20 are arranged between described gas-liquid separator 14 output and described compressor bank 1 air return end.
When gas-liquid separator 14 exports gas pressure between the gas returning port of compressor bank 1 or parallel connection compressor lower than preset value; low pressure switch 21 disconnects automatically; and send a pressure signal to electric-control system; thus electric-control system takes corresponding safeguard measure according to the pressure signal received; such as, compressor bank 1 is turned off.
In the present embodiment: the refrigerant output 6B being provided with high-pressure switch 22 and high-pressure pressure sensor 23 or described oil eliminator 6 between the output of described compressor bank 1 and described oil eliminator 6 entrance point 6A is provided with high-pressure switch 22 and high-pressure pressure sensor 23;
Described high-pressure pressure sensor 23 is for detecting the pressure size of the output of described compressor bank 1; Described high-pressure switch 22, for according to the pressure size detected, controls described compressor bank 1 and opens and closes.
When the pressure of the gas that compressor bank 1 is discharged looked into preset value; high-pressure switch 22 disconnects automatically, and sends a pressure signal to electric-control system, thus electric-control system takes corresponding safeguard measure according to the pressure signal received; such as, compressor bank 1 is turned off.
In addition; multi-connected machine is automatically controlled by detecting the system high pressure pressure that high-pressure pressure sensor 23 feeds back in real time; corresponding control or protection is made after the logic control computing of participation system; such as high-pressure detected, adjusted the aperture size of the first electric expansion valve 12 and the second electric expansion valve 13 by logical operation in real time.
In the present embodiment; the system low-voltage pressure fed back with the low-pressure sensor 20 on the link circuit of the gas returning port of compressor bank 1 is exported at gas-liquid separator 14; corresponding control or protection is made after the logic control computing of participation system; such as low pressure detected, adjusted the aperture size of the first electric expansion valve 12 and the second electric expansion valve 13 by logical operation in real time.
It should be noted is that, in above-described embodiment, the first air cooling heat exchanger 2 can be identical with the model of the second air cooling heat exchanger 4, also can be different.Wherein, preferred same model.
First outdoor fan 3 can be identical with the model of the second outdoor fan 5, also can be different, do not limit herein.
First cross valve 7 can be identical or not identical with the model of the second cross valve 8, do not limit herein.
The model of two or multiple stage indoor set is identical or different, does not limit herein.
The model of two or multiple indoor-unit cooling-medium switching device shifters 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 what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. a refrigerating method for Three-pipe heat recovery multi-connected machine system, is characterized in that, is applied to Three-pipe heat recovery multi-connected machine system, and described system comprises:
For providing the compressor of cold-producing medium to system, first air cooling heat exchanger and for giving the first outdoor fan of described first air cooling heat exchanger enhanced heat exchange, second air cooling heat exchanger and for giving the second outdoor fan of described second air cooling heat exchanger enhanced heat exchange, at least two indoor sets and identical with described indoor set quantity be the cooling medium switching device freezing or heat for controlling its working method connecting indoor set, liquid pipe stop valve, low pressure gas pipe stop valve, high-pressure air pipe stop valve, be connected for controlling described first air cooling heat exchanger as condenser or the first cross valve of using as evaporimeter with described first air cooling heat exchanger, be connected for controlling described second air cooling heat exchanger as condenser or the second cross valve of using as evaporimeter with described second air cooling heat exchanger, first magnetic valve and the second magnetic valve,
The quantity of described compressor is at least two, each described compressor can provide cold-producing medium to system simultaneously, and described compressor composition compressor bank, and the output of each described compressor and air return end are accumulated 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, low pressure gas pipe input, tracheae output, high-pressure air pipe input;
The liquid pipe end of described indoor set is connected with the liquid pipe output of described indoor-unit cooling-medium switching device shifter, and the tracheae end of described indoor set is connected 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 connected with described liquid pipe stop valve;
The low pressure gas pipe input of described indoor-unit cooling-medium switching device shifter is connected with described low pressure gas pipe stop valve;
The high-pressure air pipe input of described indoor-unit cooling-medium switching device shifter is connected with described high-pressure air pipe stop valve;
The first end of described first cross valve, the first end of described second cross valve are connected with described compressor bank output jointly with the input of described second magnetic valve;
Second end of described first cross valve is connected with described first air cooling heat exchanger;
3rd end of described first cross valve is connected with described compressor bank air return end with the output of the 4th end, the first magnetic valve with the 3rd end of the 4th end, described second cross valve simultaneously;
Second end of described second cross valve is connected with described second air cooling heat exchanger;
The input of described first magnetic valve is connected with described low pressure gas pipe stop valve;
The output of described second magnetic valve is connected with described high-pressure air pipe stop valve;
Also comprise the first electric expansion valve;
Described first air cooling heat exchanger is connected with described liquid pipe stop valve by described first electric expansion valve, and described first electric expansion valve is for controlling the cold medium flux flowing through described first air cooling heat exchanger;
Also comprise the second electric expansion valve;
Described second air cooling heat exchanger is connected with described liquid pipe stop valve by described second electric expansion valve, and described second electric expansion valve is for controlling the cold medium flux flowing through described second air cooling heat exchanger;
Described method comprises:
S1: open the first electric expansion valve and the second electric expansion valve, turns off the first cross valve and the second cross valve simultaneously, opens the first magnetic valve, close the second magnetic valve;
The low pressure gas pipe input of the S2: the first cooling medium switching device and the second cooling medium switching device and the conducting of tracheae output, and the high-pressure air pipe input of the first cooling medium switching device and the second cooling medium switching device and tracheae output are closed;
S3: compressor bank discharge HTHP refrigerant a part after the first cross valve after the first air cooling heat exchanger condensation through the first electric expansion valve reducing pressure by regulating flow, another part after the second cross valve after the second air cooling heat exchanger condensation through the second electric expansion valve reducing pressure by regulating flow;
Liquid refrigerants after reducing pressure by regulating flow is shunted by liquid pipe branch pipe through liquid pipe stop valve by S4: two air cooling heat exchangers, shunts to the first cooling medium switching device and the second cooling medium switching device;
S5: the liquid refrigerants being diverted to the first indoor-unit cooling-medium switching device shifter, carries out evaporation endothermic by the first indoor set be connected with the first indoor-unit cooling-medium switching device shifter;
Be diverted to the liquid refrigerants of the second indoor-unit cooling-medium switching device shifter, carry out evaporation endothermic by the second indoor set be connected with the second indoor-unit cooling-medium switching device shifter;
S6: the liquid refrigerants after the first indoor set and the second indoor set evaporation endothermic is collaborated by low pressure gas pipe branch pipe, through low pressure gas pipe stop valve, enters gas-liquid separator;
S7: gas-liquid separator is transmitted back to compressor bank after the liquid refrigerants after evaporation endothermic is carried out gas-liquid separation, completes kind of refrigeration cycle.
2. a Three-pipe heat recovery multi-connected machine system, it is characterized in that, comprise: for providing the compressor of cold-producing medium to system, first air cooling heat exchanger and for giving the first outdoor fan of described first air cooling heat exchanger enhanced heat exchange, second air cooling heat exchanger and for giving the second outdoor fan of described second air cooling heat exchanger enhanced heat exchange, at least two indoor sets and identical with described indoor set quantity be the cooling medium switching device freezing or heat for controlling its working method connecting indoor set, liquid pipe stop valve, low pressure gas pipe stop valve, high-pressure air pipe stop valve, be connected for controlling described first air cooling heat exchanger as condenser or the first cross valve of using as evaporimeter with described first air cooling heat exchanger, be connected for controlling described second air cooling heat exchanger as condenser or the second cross valve of using as evaporimeter with described second air cooling heat exchanger, first magnetic valve and the second magnetic valve,
The quantity of described compressor is at least two, each described compressor can provide cold-producing medium to system simultaneously, and described compressor composition compressor bank, and the output of each described compressor and air return end are accumulated 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, low pressure gas pipe input, tracheae output, high-pressure air pipe input;
The liquid pipe end of described indoor set is connected with the liquid pipe output of described indoor-unit cooling-medium switching device shifter, and the tracheae end of described indoor set is connected 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 connected with described liquid pipe stop valve;
The low pressure gas pipe input of described indoor-unit cooling-medium switching device shifter is connected with described low pressure gas pipe stop valve;
The high-pressure air pipe input of described indoor-unit cooling-medium switching device shifter is connected with described high-pressure air pipe stop valve;
The first end of described first cross valve, the first end of described second cross valve are connected with described compressor bank output jointly with the input of described second magnetic valve;
Second end of described first cross valve is connected with described first air cooling heat exchanger;
3rd end of described first cross valve is connected with described compressor bank air return end with the output of the 4th end, the first magnetic valve with the 3rd end of the 4th end, described second cross valve simultaneously;
Second end of described second cross valve is connected with described second air cooling heat exchanger;
The input of described first magnetic valve is connected with described low pressure gas pipe stop valve;
The output of described second magnetic valve is connected with described high-pressure air pipe stop valve;
Also comprise the first electric expansion valve;
Described first air cooling heat exchanger is connected with described liquid pipe stop valve by described first electric expansion valve, and described first electric expansion valve is for controlling the cold medium flux flowing through described first air cooling heat exchanger;
Also comprise the second electric expansion valve;
Described second air cooling heat exchanger is connected with described liquid pipe stop valve by described second electric expansion valve, and described second electric expansion valve is for controlling the cold medium flux flowing through described second air cooling heat exchanger.
3. 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 the refrigerant flowing into described compressor bank;
Described gas-liquid separator is provided with entrance point and the port of export;
The entrance point of described gas-liquid separator is communicated with described first magnetic valve jointly with described first cross valve, described second cross valve; The described gas-liquid separator port of export is connected with described compressor bank air return end.
4. Three-pipe heat recovery multi-connected machine system according to claim 3, is characterized in that,
Also comprise low-pressure sensor for detecting pressure size between described gas-liquid separator output and described compressor bank air return end and for according to the pressure size detected, control the low tension switch that between described gas-liquid separator output and described compressor bank air return end, pipeline is opened and turned off;
Described low tension switch and described low-pressure sensor are arranged between described gas-liquid separator output and described compressor bank air return end.
5. 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 connected with the output of described compressor bank, and the refrigerant output of described oil eliminator is connected with described first cross valve, described second cross valve and described second magnetic valve;
The oily output of described oil eliminator is provided with the capillary be communicated with described compressor bank air return end;
The high-pressure gaseous refrigerant that described capillary is used for flowing out compressor bank is separated with refrigerator oil, high-pressure gaseous refrigerant is discharged by the refrigerant output of described oil eliminator, isolated refrigerator oil is flowed back to described compressor bank by the capillary of described oil eliminator oil output, and described capillary is for controlling the oil drain quantity of described oil eliminator.
6. Three-pipe heat recovery multi-connected machine system according to claim 5, is characterized in that,
The refrigerant output being provided with high-pressure switch and high-pressure pressure sensor or described oil eliminator between the output of described compressor bank and described oil eliminator entrance point is provided with high-pressure switch and high-pressure pressure sensor;
Described high-pressure pressure sensor is for detecting the pressure size of the output of described compressor bank; Described high-pressure switch is used for the pressure size according to detecting, and controls described compressor bank and opens and closes.
7. Three-pipe heat recovery multi-connected machine system according to claim 2, is characterized in that,
Three-pipe heat recovery multi-connected machine Operation system setting has 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 and described second indoor-unit cooling-medium switching device shifter and liquid pipe branch pipe, low pressure gas pipe branch pipe that are connected with described second indoor set with described first indoor set respectively, high-pressure air pipe branch pipe;
The liquid pipe output of described first indoor-unit cooling-medium switching device shifter is connected with the liquid pipe end of described first indoor set, and the liquid pipe input of described first indoor-unit cooling-medium switching device shifter is connected with described 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 connected with the tracheae end of described first indoor set; The tracheae input of the first indoor-unit cooling-medium switching device shifter is connected 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 connected 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 second indoor-unit cooling-medium switching device shifter is connected with the liquid pipe end of described second indoor set, and the liquid pipe input of described second indoor-unit cooling-medium switching device shifter is connected 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 connected with the tracheae end of described indoor set; The low pressure gas pipe input of the second indoor-unit cooling-medium switching device shifter is connected 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 connected with the high-pressure air pipe stop valve of described off-premises station by high-pressure air pipe branch pipe.
8. 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.
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| CN103759455A (en) * | 2014-01-27 | 2014-04-30 | 青岛海信日立空调系统有限公司 | Heat recovery variable-frequency multi-split heat pump system and control method thereof |
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| CN104154673A (en) | 2014-11-19 |
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