CN104214985A - Multi-split air conditioning system and low-temperature refrigeration method - Google Patents
Multi-split air conditioning system and low-temperature refrigeration method Download PDFInfo
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- CN104214985A CN104214985A CN201410440839.7A CN201410440839A CN104214985A CN 104214985 A CN104214985 A CN 104214985A CN 201410440839 A CN201410440839 A CN 201410440839A CN 104214985 A CN104214985 A CN 104214985A
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Abstract
The invention provides a multi-split air conditioning system, which comprises a compressor or a plurality of parallel compressors, two independent outdoor heat exchangers, two four-way valves, two electronic expansion valves and a one-way valve. According to the multi-split air conditioning system, the adoption of only one outdoor heat exchanger is replaced by the adoption of the two outdoor exchangers, so that the aim of reducing the area of a condenser is fulfilled by switching off one outdoor heat exchanger during the low-temperature refrigeration of the multi-split air conditioning system, and system pressure and exhaust and return air temperature can be controlled and maintained within reasonable ranges to reduce the liquid coolant returning risk of the system and ensure the reliability of the system; during the high-temperature heating of the multi-split air conditioning system, the area of an evaporator is reduced by switching off one outdoor heat exchanger, and the system pressure and the exhaust and return air temperature can be controlled and maintained within reasonable ranges to reduce the risks of high temperature and high pressure of the system and ensure the reliability of the system.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly relate to a kind of multi-connected air conditioning system and cryogenic refrigeration method.
Background technology
The outdoor heat exchanger of existing multi-connected air conditioning system is make an overall stream substantially, this overall stream is conducive to production technology when off-premises station is smaller and off-premises station controls, but what the ability of separate unit multi-connected machine off-premises station was done in the market is increasing, at present larger have 30, the off-premises station of an even larger number, the outdoor heat exchanger of this overall stream is when cryogenic refrigeration, outdoor heat exchanger is all used as condenser, condensation effect may be made so very good, evaporimeter can not evaporate completely, in refrigeration, capabilities is too sufficient causes the high frequent start and stop of off-premises station or causes system to return liquid refrigerants, compressor is caused to burn time serious, when high temperature heats, compressor exhaust temperature is high, at this moment system pressure also can be very high, and outdoor heat exchanger is all used as evaporimeter, evaporation effect is very good, and heating capacity too abundance causes compressor of outdoor unit frequent start-stop or causes suction temperature very high, and the words that suction temperature is high cause again delivery temperature higher, the vicious circle like this compressor that goes down is in operate at high voltage all the time, finally can burn compressor, current multi-connected machine mainly regulates off-premises station blower fan to turn air quantity to regulate the heat exchange efficiency of outdoor unit heat exchanger by adopting to above two states, even if but close off-premises station blower fan at present larger off-premises station, when only utilizing heat exchanger to follow the heat convection of air still cannot solve cryogenic refrigeration, evaporation not exclusively makes system return to make system pressure too high when liquid and high temperature heat and the risk that causes burning compressor.
Summary of the invention
A kind of multi-connected air conditioning system, comprising:
For providing the compressor of refrigerant to system, for making the refrigerant evaporation heat absorption of system or the first outdoor heat exchanger of condensation and the second outdoor heat exchanger, for making the refrigerant evaporation heat absorption of system or the first indoor set of condensation and the second indoor set, the high-pressure stop valve be connected with described second indoor set input with described first indoor set input, the low-pressure shutoff valve be connected with described second indoor set output with described first indoor set output, for controlling the first electric expansion valve of the cold medium flux flowing through described first outdoor heat exchanger, for controlling the second electric expansion valve and first cross valve of the cold medium flux flowing through described second outdoor heat exchanger, second cross valve, check valve,
The quantity of described compressor is at least one, and described compressor can provide cold-producing medium to system, and described compressor composition compressor bank, and the output of each described compressor and air return end are accumulated the output of compressor bank and the air return end of compressor bank;
The input of described first electric expansion valve is connected with the output of described first outdoor heat exchanger, and the output of described first electric expansion valve is connected with described high-pressure stop valve;
The input of described second electric expansion valve is connected with the output of described second outdoor heat exchanger, and the output of described second electric expansion valve is connected with described high-pressure stop valve;
The first end of described first cross valve is connected with the output of described compressor bank, second end of described first cross valve is connected with the input of described first outdoor heat exchanger, the first end of described second cross valve and the output of described check valve, 3rd end of described first cross valve is connected with described low-pressure shutoff valve, 4th end of described first cross valve is connected with the air return end of described compressor bank, and described first cross valve makes system enter refrigeration or heating mode for controlling described first outdoor heat exchanger and described second outdoor heat exchanger;
The first end of described second cross valve is connected with the second end of described first cross valve, the input of described first outdoor heat exchanger, the output of described check valve, second end of described second cross valve is connected with the input of described second outdoor heat exchanger and the input of described check valve, and the 3rd end of described second cross valve is connected with the 4th end of described first cross valve and the air return end of described compressor bank with the 4th end; Described second cross valve is for controlling the refrigerant cutting off the second outdoor heat exchanger when freezing;
The input of described check valve is connected with the input of the second end of described second cross valve and described second outdoor heat exchanger, the output of described check valve is connected with the first end of the input of described first outdoor heat exchanger, the second end of the first cross valve and described second cross valve, increase the circulation of system refrigerant when described check valve is used for heating, reduce system pressure loss.
Preferably, the gas-liquid separator for carrying out gas-liquid separation to the refrigerant flowing into described compressor bank is also comprised;
3rd end, the 4th end of the input of described gas-liquid separator and the 4th end of described first cross valve and described second cross valve are connected, and the output of described gas-liquid separator is connected with the air return end of described compressor bank.
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, passage 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;
The input of described oil eliminator is connected with the output of described compressor bank, and the refrigerant output of described oil eliminator is connected with the first end of described first cross valve.
Preferably, the oily output of described oil eliminator is provided with the capillary be connected 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, described oil eliminator input or refrigerant output are 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, according to the pressure size detected, controlling the opening and closing of described compressor bank output.
Preferably, also comprise: branch pipe gentle side, liquid side branch pipe;
The input of described first indoor set is connected with described high-pressure stop valve by described liquid side branch pipe, and the input of the second indoor set is connected with described high-pressure stop valve by described liquid side branch pipe;
The output of described first indoor set is connected with described low-pressure shutoff valve by described gas side branch pipe, and the output of described second indoor set is connected with described low-pressure shutoff valve by described gas side branch pipe.
Preferably, described compressor adopts frequency-changeable compressor, or constant speed compressor, or digital compressor.
Preferably, the model of described first outdoor heat exchanger and described second outdoor heat exchanger is identical or different;
The model of described first electric expansion valve and described second electric expansion valve is identical or different.
A cryogenic refrigeration method for multi-connected air conditioning system, comprising:
Close the second outdoor heat exchanger, the first cross valve power down, the second cross valve powers on, and the first electric expansion valve is opened, and the second electric expansion valve is closed;
The refrigerant of the HTHP that compressor bank is discharged enters the first outdoor heat exchanger condensation, and form liquid refrigerants through the first electric expansion valve reducing pressure by regulating flow after condensation, liquid refrigerants is diverted to the first indoor set and the second indoor set through high-pressure stop valve by liquid side branch pipe;
Liquid refrigerants is evaporation endothermic in the first indoor set and the second indoor set, forms gaseous coolant after evaporation endothermic, and gaseous coolant collaborates through gas side branch pipe;
Gaseous coolant behind interflow enters gas-liquid separator through low-pressure shutoff valve and the first cross valve and carries out gas-liquid separation;
Refrigerant after gas-liquid separation is got back to compressor bank and is completed kind of refrigeration cycle.
As can be seen from the above technical solutions, the present invention has the following advantages:
The present invention is by replacing an original outdoor heat exchanger by two outdoor heat exchangers, make multiple on-line system when cryogenic refrigeration, by cutting off an outdoor heat exchanger, reach the object reducing condenser area, realize by system pressure and exhaust and suction temperature control maintenance in the reasonable scope, thus reduction system returns the risk of liquid refrigerants, ensure that the reliability of system; When multiple on-line system heats at high temperature, by cutting off an outdoor heat exchanger, reach minimizing evaporator area, realize by system pressure and exhaust and suction temperature control maintenance in the reasonable scope, thus Keep Clear-High Voltage to reduce system high temperature, ensures the reliability of system.Therefore, a kind of multi-connected air conditioning system provided by the invention effectively improves the integrity problem of multiple on-line system when cryogenic refrigeration, high temperature heat.
Term " first ", " second ", " the 3rd " " 4th " etc. (if existence) in description of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, and intention is to cover not exclusive comprising.
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.
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.
The structural representation of Fig. 1 a kind of multi-connected air conditioning system disclosed in the embodiment of the present invention;
Fig. 2 is the flow chart of the refrigerating method of multi-connected air conditioning system provided by the invention.
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.
The embodiment of the invention discloses a kind of multi-connected air conditioning system, see Fig. 1, comprising:
Specifically comprise the compressor for providing refrigerant to system, for making refrigerant evaporation heat absorption or first outdoor heat exchanger 2 and second outdoor heat exchanger 4 of condensation of system, for making refrigerant evaporation heat absorption or first indoor set 40 and second indoor set 41 of condensation of system, the high-pressure stop valve 15 be connected with described second indoor set 41 input with described first indoor set 40 input, the low-pressure shutoff valve 17 be connected with described second indoor set 41 output with described first indoor set 40 output, for controlling the first electric expansion valve 12 of the cold medium flux flowing through described first outdoor heat exchanger 2, for controlling the second electric expansion valve 13 and the first cross valve 7 of the cold medium flux flowing through described second outdoor heat exchanger 4, second cross valve 8, check valve 9,
The quantity of described compressor is at least one, described compressor can provide cold-producing medium to system, and described compressor composition compressor bank 1, and the output of each described compressor and air return end are accumulated the output of compressor bank 1 and the air return end of compressor bank 1;
The input of described first electric expansion valve 12 is connected with the output of described first outdoor heat exchanger 2, and the output of described first electric expansion valve 12 is connected with described high-pressure stop valve 15;
The input of described second electric expansion valve 4 is connected with the output of the second outdoor heat exchanger 13, and the output of described second electric expansion valve 4 connects described high-pressure stop valve 15;
The first end 7D of described first cross valve 7 is connected with the output of described compressor bank 1, second end 7C of described first cross valve 7 and the input of described first outdoor heat exchanger 2, the first end 8D of described second cross valve 8 is connected with the output of described check valve 9, 3rd end 7E of described first cross valve 7 is connected with described low-pressure shutoff valve 17, 4th end 7S of described first cross valve 7 is connected with the air return end of described compressor bank 1, described first cross valve 7 makes system enter refrigeration or heating mode for controlling described first outdoor heat exchanger 2 and described second outdoor heat exchanger 4,
The first end 8D of described second cross valve 8 is connected with the second end 7C of described first cross valve 7, the described input of the first outdoor heat exchanger 2, the output of described check valve 9, second end 8C of described second cross valve 8 is connected with the described input of the second outdoor heat exchanger 4 and the input of described check valve 9, and the 3rd end 8E of described second cross valve 8 is connected with the 4th end 7S of described first cross valve 7 and the air return end of described compressor bank 1 with the 4th end 8S; Described second cross valve 8 is for controlling the refrigerant cutting off the second outdoor heat exchanger 4 when freezing;
It should be noted that, cross valve (such as above-mentioned first cross valve 7, second cross valve 8) when power down, first end D and the second end C conducting, the 3rd end E and the 4th end S conducting;
Cross valve when powering on, first end D and the 3rd end E conducting, the second end C and the 4th end S conducting.
The input of described check valve 9 is connected with the input of the second end 8C of the second cross valve 8 and the second outdoor heat exchanger 4, and the output of check valve 9 is connected with the second end 7C of the input of the first outdoor heat exchanger 2, the first cross valve 7 and the first end 8D of the second cross valve 8; The circulating direction of check valve 9 is from input to output, does not oppositely circulate.Increasing the circulation of system refrigerant when check valve 9 is for heating, reducing system pressure loss.
In the present embodiment, two indoor sets: the first indoor set 40, second indoor set 41, wherein the input 40A of the first indoor set 40 is connected with high-pressure stop valve 15 by liquid side branch pipe 50, and the input 41A of the second indoor set 41 is connected with high-pressure stop valve 15 by liquid side branch pipe 50; The output 40B of the first indoor set 40 is connected with low-pressure shutoff valve 17 by gas side branch pipe 51, and the output 41B of the second indoor set 41 is connected with low-pressure shutoff valve 17 by gas side branch pipe 51.
In summary it can be seen, the present invention is by replacing an original outdoor heat exchanger by two outdoor heat exchangers, make multiple on-line system when cryogenic refrigeration, by cutting off an outdoor heat exchanger, reach the object reducing condenser area, realize system pressure and exhaust and suction temperature to control maintenance in the reasonable scope, thus reduction system returns the risk of liquid refrigerants, ensure that the reliability of system; When multiple on-line system heats at high temperature, by cutting off an outdoor heat exchanger, reach minimizing evaporator area, realize by system pressure and exhaust and suction temperature control maintenance in the reasonable scope, thus Keep Clear-High Voltage to reduce system high temperature, ensures the reliability of system.Therefore, a kind of multi-connected air conditioning system provided by the invention effectively improves the reliability of multiple on-line system when cryogenic refrigeration, high temperature heat.
It will be understood by those skilled in the art that, for ensureing that the first outdoor heat exchanger 2 and the second outdoor heat exchanger 4 have good refrigeration when using as condenser, or have good heating effect when using as evaporimeter, therefore, the cold medium flux controlling to flow through the first outdoor heat exchanger 2 and the second outdoor heat exchanger 4 is most important.
Therefore, the first outdoor heat exchanger 2 is connected with high-pressure stop valve 15 by the first electric expansion valve 12, and the first electric expansion valve 12 is for controlling the cold medium flux flowing through the first outdoor heat exchanger 2.In like manner, the second outdoor heat exchanger 4 is connected with high-pressure stop valve 15 by the second electric expansion valve 13, and the second electric expansion valve 13 is for controlling the cold medium flux flowing through the second outdoor heat exchanger 4.
In the present embodiment, also comprise: gas-liquid separator 14;
The input of gas-liquid separator 14 is connected with the 3rd end 8E, the 4th end 8S of the 4th end 7S of the first cross valve 7 and the second cross valve 8, and the output of gas-liquid separator 14 connects the air return end of compressor bank 1; Gas-liquid separator 14 is for carrying out gas-liquid separation to the gaseous coolant of the air return end flowing into compressor bank 1.
For optimizing above-described embodiment further, also comprise: oil eliminator 6;
The entrance point 6A of oil eliminator 6 connects the air return end of compressor bank 1, and the refrigerant output 6B of oil eliminator 6 connects the first end 7D of cross valve 7; The oily output 6C of oil eliminator 6 connects the air return end of compressor bank 1 by capillary 24;
Oil eliminator 6 is for being separated with compressor and freeze machine oil the gaseous coolant of the air return end flowing out compressor bank 1, high-pressure gaseous refrigerant is discharged by the refrigerant output 6B of oil eliminator, isolated compressor and freeze machine oil is discharged by the oily output 6C of oil eliminator the air return end getting back to compressor bank 1 through capillary 24, and wherein capillary 24 is for controlling the oil drain quantity of oil eliminator.
In the present embodiment, also comprise: liquid side branch pipe 50 gentle side branch pipe 51; The input 40A of described first indoor set 40 is connected with described high-pressure stop valve 15 by described liquid side branch pipe 50, and the input 41A of the second indoor set 41 is connected with described high-pressure stop valve 15 by described liquid side branch pipe 50;
The output 40B of described first indoor set 40 is connected with described low-pressure shutoff valve 17 by described gas side branch pipe 51, and the output 41B of described second indoor set 41 is connected with described low-pressure shutoff valve 17 by described gas side branch pipe 51.
In the present invention, provide a kind of cryogenic refrigeration method of multi-connected air conditioning system, refer to Fig. 2 and shown in composition graphs 1, comprising:
S1: close the second outdoor heat exchanger, the first cross valve power down, the second cross valve powers on, and the first electric expansion valve is opened, and the second electric expansion valve is closed;
S2: the refrigerant of the HTHP that compressor bank is discharged enters the first outdoor heat exchanger condensation, form liquid refrigerants through the first electric expansion valve reducing pressure by regulating flow after condensation, liquid refrigerants is diverted to the first indoor set and the second indoor set through high-pressure stop valve by liquid side branch pipe;
S3: liquid refrigerants is evaporation endothermic in the first indoor set and the second indoor set, forms gaseous coolant after evaporation endothermic, gaseous coolant collaborates through gas side branch pipe;
S4: the gaseous coolant behind interflow enters gas-liquid separator through low-pressure shutoff valve and the first cross valve and carries out gas-liquid separation;
S5: the refrigerant after gas-liquid separation is got back to compressor bank and completed kind of refrigeration cycle.
Multi-connected air conditioning system kind of refrigeration cycle controls specific as follows:
Multi-connected air conditioning system is when cryogenic refrigeration, air-cooled side environment temperature is low, two outdoor heat exchangers are without the need to all making condenser, now, an outdoor heat exchanger can be closed, the second outdoor heat exchanger 4 can be closed, first cross valve 7 power down of multi-connected air conditioning system, second cross valve 8 powers on, and the first electric expansion valve 12 is opened under the control of electric-control system, and the second electric expansion valve 13 is closed.Compressor bank 1 discharge HTHP refrigerant all after the first outdoor heat exchanger 2 condensation through the first electric expansion valve 12 reducing pressure by regulating flow, the liquid refrigerants of refrigerant after the first air cooling heat exchanger 2 reducing pressure by regulating flow is clipped to the first indoor set 40 and the second indoor set 41 devaporation heat absorption by after the shunting of liquid side branch pipe 50 point after high-pressure stop valve 15, become after evaporation endothermic gaseous coolant through gas side branch pipe 51 interflow after by low-pressure shutoff valve 17 after get back to gas-liquid separator 14 through the first cross valve 7 again, finally get back to compressor bank 1 and complete kind of refrigeration cycle, reach the object of multiple on-line system refrigeration.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, 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.Because the second electric expansion valve 13 is closed, and the second end 8C of the second cross valve 8 and the 4th end 8S conducting, the refrigerant in the second cross valve 8 all gets back to gas-liquid separator 14, and that is do not circulate in the second cross valve 8 refrigerant.
Specific as follows in the loop control of freezing and heat in multi-connected air conditioning system provided by the invention:
Multi-connected air conditioning system is when freezing, and the first cross valve 7 power down, the second cross valve 8 power down, the first electric expansion valve 12 and the second electric expansion valve 13 are opened under the control of electric-control system.The refrigerant part of the HTHP that compressor bank 1 is discharged after the first cross valve 7 directly after the first outdoor heat exchanger 2 condensation through the first electric expansion valve 12 reducing pressure by regulating flow, a part after the first cross valve 7 again after the second cross valve 8 to the second outdoor heat exchanger 4 condensation through the second electric expansion valve 13 reducing pressure by regulating flow, divide after the shunting of liquid side branch pipe 50 after liquid refrigerants after two outdoor heat exchanger reducing pressure by regulating flows to high-pressure stop valve 15 and be clipped to the first indoor set 40 and the second indoor set 41 devaporation heat absorption, become gaseous coolant after evaporation endothermic and get back to gas-liquid separator 14 through the first cross valve 7 behind gas side branch pipe 51 interflow, finally get back to compressor bank 1 and complete kind of refrigeration cycle, reach the object of multiple on-line system refrigeration.
Multi-connected air conditioning system is when heating, and the first cross valve 7 powers on, the second cross valve 8 power down, and the first electric expansion valve 12, second electric expansion valve 13 is opened under the control of electric-control system.The refrigerant of the HTHP that compressor bank 1 is discharged is clipped to the first indoor set 40 and the second indoor set 41 condensation by after the shunting of gas side branch pipe 51 point after the first cross valve 7 to low-pressure shutoff valve 17, condensed liquid refrigerants collaborates through liquid side branch pipe 50, a part 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 outdoor heat exchanger 2 evaporation endothermic, a part after the second electric expansion valve 13 reducing pressure by regulating flow to the second outdoor heat exchanger 4 evaporation endothermic rear portion through check valve 9, a part is through the second cross valve 8, gas-liquid separator 14 is got back to again through the first cross valve 7, finally get back to compressor bank 1 to complete and heat circulation, reach the object that multiple on-line system heats.
Multi-connected air conditioning system raising multiple on-line system disclosed by the invention is as follows in the detailed process of the reliability that high temperature heats:
Multi-connected air conditioning system is when high temperature heats, and condenser made by the heat exchanger of the first indoor set 40 and the second indoor set 41, and outdoor heat exchanger makes evaporimeter, air-cooled side environment temperature is high, evaporation effect is good, and compressor bank 1 delivery temperature is high, pressure at expulsion is high, can reduce evaporator area like this.Such as using the first air cooling heat exchanger 2 as evaporimeter, close the second outdoor heat exchanger 4.Control procedure is as follows: the first cross valve 7 powers on, the second cross valve 8 power down, and the first electric expansion valve 12 is opened under the control of electric-control system, and the second electric expansion valve 13 is closed.Compressor bank 1 discharge HTHP refrigerant after the first cross valve 7 to low-pressure shutoff valve 17 again through gas side branch pipe 51 shunting after divide be clipped to condensation in the first indoor set 40 and the second indoor set 41, condensed refrigerant arrives high-pressure stop valve 15 and between the first electric expansion valve 12 and the second electric expansion valve 13 behind liquid side branch pipe 50 interflow, condensed refrigerant eventually passes after the first electric expansion valve 12 to the first air cooling heat exchanger 2 evaporation endothermic, then after the first cross valve 7 finally gets back to gas-liquid separator 14, get back to compressor bank 1 and complete whole refrigerant circulation.
It should be noted that, due to the second cross valve 8 power down, the first end 8D of the second cross valve 8 and the second end 8C conducting, because the second electric expansion valve 13 is closed, refrigerant in second cross valve 8 all gets back to gas-liquid separator 14, and that is do not circulate in the second cross valve 8 refrigerant.
Multiple on-line system is when cryogenic refrigeration, high temperature heat, do not circulate in second outdoor cold heat exchanger 4 refrigerant, also be just equivalent to decrease outdoor heat exchanger area, reduce condensation effect, the high-pressure that the system that ensure that is certain and low pressure, what control system returns liquid risk, greatly increases the reliability of system.
In summary it can be seen, the present invention is by replacing an original outdoor heat exchanger by two outdoor heat exchangers, make multiple on-line system when cryogenic refrigeration, by cutting off an outdoor heat exchanger, reach the object reducing condenser area, realize system pressure and exhaust and suction temperature to control maintenance in the reasonable scope, thus reduction system returns the risk of liquid refrigerants, ensure that the reliability of system; When multiple on-line system heats at high temperature, by cutting off an outdoor heat exchanger, reach minimizing evaporator area, realize by system pressure and exhaust and suction temperature control maintenance in the reasonable scope, thus Keep Clear-High Voltage to reduce system high temperature, ensures the reliability of system.Therefore, a kind of multi-connected air conditioning system provided by the invention effectively improves the reliability of multiple on-line system when cryogenic refrigeration, high temperature heat.
It will be appreciated by persons skilled in the art that the hypertonia in multiple on-line system or the too low stable operation that all can affect multiple on-line system.Therefore, the present invention is the operation ensureing that multi-connected air conditioning system is reliable and stable, in the above-described embodiments:
Also comprise 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, control 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 pressure between gas-liquid separator 14 output and the air return end of compressor bank 1 is 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.
Multi-connected air conditioning system is automatically controlled can also by detecting the system low-voltage pressure that low-pressure sensor 20 feeds back in real time; 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.
Described oil eliminator 6 input 6A or refrigerant output 6B 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 the opening and closing of described compressor bank 1 output.
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.
Certain multi-connected air conditioning system is automatically controlled can also 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.
It should be noted is that, in above-described embodiment, the first outdoor heat exchanger 2 can be identical with the model of the second outdoor heat exchanger 4, also can be different.Wherein, preferred same model.
First cross valve 7 can be identical with the model of the second cross valve 8, also can be different.Do not limit herein.
In like manner, the first electric expansion valve 12 can be identical with the model of the second electric expansion valve 13, also can be different.Wherein, preferred same model.
Described compressor adopts frequency-changeable compressor, or constant speed compressor, or digital compressor.
In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
Claims (10)
1. a multi-connected air conditioning system, is characterized in that, comprising:
For providing the compressor of refrigerant to system, for making the refrigerant evaporation heat absorption of system or the first outdoor heat exchanger of condensation and the second outdoor heat exchanger, for making the refrigerant evaporation heat absorption of system or the first indoor set of condensation and the second indoor set, the high-pressure stop valve be connected with described second indoor set input with described first indoor set input, the low-pressure shutoff valve be connected with described second indoor set output with described first indoor set output, for controlling the first electric expansion valve of the cold medium flux flowing through described first outdoor heat exchanger, for controlling the second electric expansion valve and first cross valve of the cold medium flux flowing through described second outdoor heat exchanger, second cross valve, check valve,
The quantity of described compressor is at least one, and described compressor can provide cold-producing medium to system, and described compressor composition compressor bank, and the output of each described compressor and air return end are accumulated the output of compressor bank and the air return end of compressor bank;
The input of described first electric expansion valve is connected with the output of described first outdoor heat exchanger, and the output of described first electric expansion valve is connected with described high-pressure stop valve;
The input of described second electric expansion valve is connected with the output of described second outdoor heat exchanger, and the output of described second electric expansion valve is connected with described high-pressure stop valve;
The first end of described first cross valve is connected with the output of described compressor bank, second end of described first cross valve is connected with the input of described first outdoor heat exchanger, the first end of described second cross valve and the output of described check valve, 3rd end of described first cross valve is connected with described low-pressure shutoff valve, 4th end of described first cross valve is connected with the air return end of described compressor bank, and described first cross valve makes system enter refrigeration or heating mode for controlling described first outdoor heat exchanger and described second outdoor heat exchanger;
The first end of described second cross valve is connected with the second end of described first cross valve, the input of described first outdoor heat exchanger, the output of described check valve, second end of described second cross valve is connected with the input of described second outdoor heat exchanger and the input of described check valve, and the 3rd end of described second cross valve is connected with the 4th end of described first cross valve and the air return end of described compressor bank with the 4th end; Described second cross valve cuts off the refrigerant of the second outdoor heat exchanger when being used for control system refrigeration;
The input of described check valve is connected with the input of the second end of described second cross valve and described second outdoor heat exchanger, the output of described check valve is connected with the first end of the input of described first outdoor heat exchanger, the second end of the first cross valve and described second cross valve, described check valve is used for increasing the circulation of system refrigerant when system heats, and reduces system pressure loss.
2. multi-connected air conditioning system according to claim 1, is characterized in that,
Also comprise the gas-liquid separator for carrying out gas-liquid separation to the refrigerant flowing into described compressor bank;
3rd end, the 4th end of the input of described gas-liquid separator and the 4th end of described first cross valve and described second cross valve are connected, and the output of described gas-liquid separator is connected with the air return end of described compressor bank.
3. multi-connected air conditioning system according to claim 2, is characterized in that,
Also comprise 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, passage 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.
4. multi-connected air conditioning system according to claim 1, is characterized in that,
Also comprise oil eliminator;
The input of described oil eliminator is connected with the output of described compressor bank, and the refrigerant output of described oil eliminator is connected with the first end of described first cross valve.
5. multi-connected air conditioning system according to claim 4, is characterized in that,
The oily output of described oil eliminator is provided with the capillary be connected 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. multi-connected air conditioning system according to claim 4, is characterized in that,
Described oil eliminator input or refrigerant output are provided with high-pressure switch and high-pressure 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, according to the pressure size detected, controlling the opening and closing of described compressor bank output.
7. multi-connected air conditioning system according to claim 1, is characterized in that,
Also comprise: branch pipe gentle side, liquid side branch pipe;
The input of described first indoor set is connected with described high-pressure stop valve by described liquid side branch pipe, and the input of the second indoor set is connected with described high-pressure stop valve by described liquid side branch pipe;
The output of described first indoor set is connected with described low-pressure shutoff valve by described gas side branch pipe, and the output of described second indoor set is connected with described low-pressure shutoff valve by described gas side branch pipe.
8. multi-connected air conditioning system according to claim 1, is characterized in that,
Described compressor adopts frequency-changeable compressor, or constant speed compressor, or digital compressor.
9. multi-connected air conditioning system according to claim 1, is characterized in that,
The model of described first outdoor heat exchanger and described second outdoor heat exchanger is identical or different;
The model of described first electric expansion valve and described second electric expansion valve is identical or different.
10. a cryogenic refrigeration method for multi-connected air conditioning system, is characterized in that, comprising:
S1: close the second outdoor heat exchanger, the first cross valve power down, the second cross valve powers on, and the first electric expansion valve is opened, and the second electric expansion valve is closed;
S2: the refrigerant of the HTHP that compressor bank is discharged enters the first outdoor heat exchanger condensation, form liquid refrigerants through the first electric expansion valve reducing pressure by regulating flow after condensation, liquid refrigerants is diverted to the first indoor set and the second indoor set through high-pressure stop valve by liquid side branch pipe;
S3: liquid refrigerants is evaporation endothermic in the first indoor set and the second indoor set, forms gaseous coolant after evaporation endothermic, gaseous coolant collaborates through gas side branch pipe;
S4: the gaseous coolant behind interflow enters gas-liquid separator through low-pressure shutoff valve and the first cross valve and carries out gas-liquid separation;
S5: the refrigerant after gas-liquid separation is got back to compressor bank and completed kind of refrigeration cycle.
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Address after: 510000 No.1 by helongsha villager group, Shengli village, Lishui Town, Nanhai District, Foshan City, Guangdong Province Patentee after: Guangdong Kaili HVAC Co.,Ltd. Address before: 510000 No.1 by helongsha villager group, Shengli village, Lishui Town, Nanhai District, Foshan City, Guangdong Province Patentee before: GUANGDONG CHIGO HEATING AND VENTILATION EQUIPMENT Co.,Ltd. |