CN104197582B - Multi-connection air conditioning system - Google Patents
Multi-connection air conditioning system Download PDFInfo
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- CN104197582B CN104197582B CN201410440837.8A CN201410440837A CN104197582B CN 104197582 B CN104197582 B CN 104197582B CN 201410440837 A CN201410440837 A CN 201410440837A CN 104197582 B CN104197582 B CN 104197582B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 56
- 238000005057 refrigeration Methods 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000002826 coolant Substances 0.000 claims description 42
- 238000001704 evaporation Methods 0.000 claims description 18
- 230000008020 evaporation Effects 0.000 claims description 17
- 239000003507 refrigerant Substances 0.000 claims description 17
- 230000001276 controlling effect Effects 0.000 claims description 10
- 230000005494 condensation Effects 0.000 claims description 9
- 238000009833 condensation Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 230000004907 flux Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000006200 vaporizer Substances 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- HJCMDXDYPOUFDY-WHFBIAKZSA-N Ala-Gln Chemical compound C[C@H](N)C(=O)N[C@H](C(O)=O)CCC(N)=O HJCMDXDYPOUFDY-WHFBIAKZSA-N 0.000 description 1
- 206010020852 Hypertonia Diseases 0.000 description 1
- 108010044940 alanylglutamine Proteins 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a multi-connection air conditioning system which comprises a compressor or multiple compressors connected in parallel, two mutually-independent outdoor heat exchangers, two four-way valves, two electronic expansion valves and a one-way valve. The two outdoor heat exchangers are used for replacing an original outdoor heat exchanger, so that in the low-temperature refrigeration process of the multi-connection air conditioning system, the area of a condenser is reduced by switching off one outdoor heat exchanger, pressure, exhaust temperature and back temperature of the system are controlled and maintained within a reasonable range, risks of liquid cold medium return of the system are reduced, and reliability of the system is guaranteed; in the high-temperature heating process of the multi-connection air conditioning system, the area of an evaporator is reduced by switching off one outdoor heat exchanger, pressure, exhaust temperature and back temperature of the system are controlled and maintained within a reasonable range, high-temperature and high-pressure risks of the system are reduced, and reliability of the system is guaranteed.
Description
Technical field
The present invention relates to air-conditioning technical field, more particularly to a kind of multi-connected air conditioning system.
Background technology
The outdoor heat exchanger of existing multi-connected air conditioning system is substantially integrally formed stream, and this overall stream exists
Be conducive to production technology and off-premises station control when off-premises station is smaller, but separate unit multi-connected machine off-premises station in the market
It is increasing that ability is done, and has 30 than larger at present, even more the off-premises station of big number, and the outdoor of this overall stream is changed
In cryogenic refrigeration, outdoor heat exchanger is all used as condenser to hot device, may so make that condensation effect is very good, and vaporizer can not
Evaporating completely, function Dipeptiven abundance causes the high frequent start and stop of off-premises station or causes system to return liquid refrigerants in refrigeration,
Compressor is caused to burn when serious；When high temperature is heated, compressor exhaust temperature is high, and at this moment system pressure also can be very high, and room
External heat exchanger is all used as vaporizer, and evaporation effect is very good, heating capacity too it is sufficient cause compressor of outdoor unit frequent start-stop or
Person causes suction temperature very high, causes delivery temperature higher again if suction temperature height, and such vicious cycle is gone down the compressor beginning
Work under high pressure eventually, eventually burn compressor；Current multi-connected machine is to both the above state mainly by adopting regulation room
Outer machine blower fan turns air quantity to adjust the heat exchange efficiency of outdoor unit heat exchanger, but even if at present than larger off-premises station close chamber
Outer machine blower fan, evaporation when only still cannot solve cryogenic refrigeration with the heat convection of air using heat exchanger not exclusively causes system
Return when liquid and high temperature are heated so that system pressure is too high and cause to burn the risk of compressor.
The content of the invention
The present invention provides a kind of multi-connected air conditioning system, including：
For providing a system to the compressor of coolant, the refrigerant evaporation for making system absorbs heat or the first outdoor of condensation is changed
Hot device and the second outdoor heat exchanger, for making first indoor set and the second indoor set of the refrigerant evaporation heat absorption or condensation of system,
The high-pressure stop valve being connected with the first indoor set input and the second indoor set input, it is indoor with described first
The low-pressure shutoff valve that machine outfan is connected with the second indoor set outfan, for control first outdoor heat exchange is flow through
First electric expansion valve of the cold medium flux of device, second for controlling the cold medium flux for flowing through second outdoor heat exchanger is electric
Sub- expansion valve and the first cross valve, the second cross valve, check valve；
The quantity of the compressor is at least one, and the compressor can provide a system to cold-producing medium, and the compression
Machine constitutes compressor bank, and the outfan and air return end of each compressor are accumulated into outfan and the compression of compressor bank
The air return end of unit；
The input of first electric expansion valve is connected with the outfan of first outdoor heat exchanger, and described first is electric
The outfan of sub- expansion valve is connected with the high-pressure stop valve；
The input of second electric expansion valve is connected with the outfan of second outdoor heat exchanger, and described second is electric
The outfan of sub- expansion valve is connected with the high-pressure stop valve；
The first end of first cross valve is connected with the outfan of the compressor bank, and the second of first cross valve
End is connected with the input of first outdoor heat exchanger, the 3rd end and the low-pressure shutoff valve and the institute of first cross valve
The connection of check valve input is stated, the 4th end of first cross valve is connected with the air return end of the compressor bank；Described first
Cross valve makes system enter refrigeration or heating mode for controlling first outdoor heat exchanger and second outdoor heat exchanger；
The first end of second cross valve is connected with the outfan of the compressor bank, and the second of second cross valve
End is connected with the input of second outdoor heat exchanger, the 3rd end of second cross valve and the outfan of the check valve
Connection；4th end of second cross valve is connected with the air return end of the compressor bank, and second cross valve is used to control
The coolant of the second outdoor heat exchanger is cut off during cooling system；
The input of the check valve and the low-pressure shutoff valve and the three-terminal link of first cross valve, the list
To the outfan and the three-terminal link of second cross valve of valve, system coolant is increased when the check valve is heated for system
Circulation, reduces system pressure loss.
Preferably, the gas-liquid separator for carrying out gas-liquid separation to the coolant for flowing into the compressor bank is also included；
4th end of the input of the gas-liquid separator and first cross valve and the 4th of second cross valve the
End connection, the outfan of the gas-liquid separator is connected with the air return end of the compressor bank.
Preferably, also include for detecting pressure between the gas-liquid separator outfan and the compressor bank air return end
The low-pressure sensor of size and for according to the pressure size of detection, controlling the gas-liquid separator outfan and the pressure
The low tension switch that passage is switched on and off between contracting unit air return end；
The low tension switch and the low-pressure sensor are arranged on the gas-liquid separator outfan and the compression
Between unit air return end.
Preferably, also including oil eliminator；
The input of the oil eliminator is connected with the outfan of the compressor bank, the coolant output of the oil eliminator
End is connected with the first end of first cross valve and the first end of second cross valve.
Preferably, the oily outfan of the oil eliminator is provided with the capillary tube being connected with the compressor bank air return end；
The capillary tube is used for high-pressure gaseous refrigerant and refrigerator oil to flowing out compressor bank and separates, and makes high pressure gas
State coolant is discharged by the coolant outfan of the oil eliminator, and the refrigerator oil isolated is defeated by the oil eliminator oil
The capillary tube for going out end flows back to the compressor bank, and the capillary tube is used to control the oil drain quantity of the oil eliminator.
Preferably, the oil eliminator input or coolant outfan are provided with high-pressure switch and high-pressure is passed
Sensor；
The high-pressure pressure sensor is used for the pressure size of the outfan for detecting the compressor bank；The high-pressure
Switch for according to the pressure size of detection, controlling the opening and closing of the compressor bank outfan.
Preferably, also include：The gentle side branch pipe of liquid side branch pipe；
The input of first indoor set is connected by liquid side branch pipe with the high-pressure stop valve, and second is indoor
The input of machine is connected by liquid side branch pipe with the high-pressure stop valve；
The outfan of first indoor set is connected by gas side branch pipe with the low-pressure shutoff valve, and described second
The outfan of indoor set is connected by gas side branch pipe with the low-pressure shutoff valve.
Preferably, the compressor adopts frequency-changeable compressor, or constant speed compressor, or digital compressor
Preferably, the model of first outdoor heat exchanger and second outdoor heat exchanger is identical or different.
Preferably, the model of first electric expansion valve and second electric expansion valve is identical or different.
As can be seen from the above technical solutions, the present invention has advantages below：
The present invention by two outdoor heat exchangers by replacing an original outdoor heat exchanger so that multiple on-line system is in low temperature
During refrigeration, by cutting off an outdoor heat exchanger, the purpose for reducing condenser area is reached, realized system pressure and aerofluxuss
Maintain in the reasonable scope with suction temperature control, so as to reduce the risk that system returns liquid refrigerants, it is ensured that the reliability of system
Property；When multiple on-line system is heated in high temperature, by cutting off an outdoor heat exchanger, reduction evaporator area is reached, realizing will
System pressure and aerofluxuss and suction temperature control are maintained in the reasonable scope, and so as to reduce system high temperature, Keep Clear-High Voltage, it is ensured that
The reliability of system.Therefore, the present invention provide a kind of multi-connected air conditioning system effectively improve multiple on-line system cryogenic refrigeration,
Integrity problem when high temperature is heated.
Description of the drawings
In order to be illustrated more clearly that technical scheme, will make simple to the accompanying drawing to be used needed for description below
Introduce on ground, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ordinary skill
For personnel, on the premise of not paying creative work, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is a kind of structural representation of multi-connected air conditioning system disclosed in the embodiment of the present invention；
Specific embodiment
To enable goal of the invention, feature, the advantage of the present invention more obvious and understandable, below will be with specific
Embodiment and accompanying drawing, are clearly and completely described, it is clear that enforcement disclosed below to the technical scheme of present invention protection
Example is only a part of embodiment of the invention, and not all embodiment.Based on the embodiment in this patent, the common skill in this area
All other embodiment that art personnel are obtained under the premise of creative work is not made, belongs to the model of this patent protection
Enclose.
The embodiment of the invention discloses a kind of multi-connected air conditioning system, referring to Fig. 1, including：
Specifically include the compressor for providing a system to coolant, the refrigerant evaporation for making system absorb heat or condense the
One outdoor heat exchanger 2 and the second outdoor heat exchanger 4, the He of the first indoor set 40 that the refrigerant evaporation for making system absorbs heat or condenses
Second indoor set 41, the high-pressure stop being connected with the input of the first indoor set 40 and the input of the second indoor set 41
Valve 15, the low-pressure shutoff valve 17 being connected with the outfan of the first indoor set 40 and the outfan of the second indoor set 41 is used
The first electric expansion valve 12 of the cold medium flux of first outdoor heat exchanger 2 is flow through in control, for control described the is flow through
Second electric expansion valve 13 and the first cross valve 7 of the cold medium flux of two outdoor heat exchangers 4, the second cross valve 8, check valve 9；
The quantity of the compressor is at least one, and the compressor can provide a system to cold-producing medium, and the compression
Machine constitutes compressor bank 1, and the outfan and air return end of each compressor are accumulated into the outfan and pressure of compressor bank 1
The air return end of contracting unit 1；
The input of first electric expansion valve 12 is connected with the outfan of first outdoor heat exchanger 2, and described
The outfan of one electric expansion valve 12 is connected with the high-pressure stop valve 15；
The input of second electric expansion valve 4 is connected with the outfan of the second outdoor heat exchanger 13, and described second is electric
The outfan of sub- expansion valve 4 connects the high-pressure stop valve 15；
First end 7D of first cross valve 7 is connected with the outfan of the compressor bank 1, first cross valve 7
The second end 7C be connected with the input of first outdoor heat exchanger 2, the 3rd end 7E of first cross valve 7 is low with described
Pressure cutoff valve 17 and the input of the check valve 9 connect, the 4th end 7S and the compressor bank 1 of first cross valve 7
Air return end connects；First cross valve 7 makes for controlling first outdoor heat exchanger 2 and second outdoor heat exchanger 4
System enters refrigeration or heating mode；
First end 8D of second cross valve 8 is connected with the outfan of the compressor bank 1, second cross valve 8
The second end 8C be connected with the input of second outdoor heat exchanger 4, the 3rd end 8E and the list of second cross valve 8
Connect to the outfan of valve 9；4th end 8S of second cross valve 8 is connected with the air return end of the compressor bank 1, and described
Two cross valves 8 cut off the coolant of the second outdoor heat exchanger 4 when freezing for control system；
It should be noted that cross valve (such as above-mentioned first cross valve 7, the second cross valve 8) is when power down, first
End D and the second end C conductings, the 3rd end E and the 4th end S is turned on；When upper electric, first end D and the 3rd end E lead cross valve
Logical, the second end C and the 4th end S is turned on.
The input of the check valve 9 is connected with the 3rd end 7E of the low-pressure shutoff valve 17 and first cross valve 7,
The outfan of the check valve 9 is connected with the 3rd end 8E of second cross valve 8, i.e. the circulating direction input of check valve 9
To outfan, reversely do not circulate.Increase the circulation of system coolant when the check valve 9 is heated for system, reduce system pressure and damage
Lose.
In the present embodiment, two indoor sets:First indoor set 40, the second indoor set 41, wherein the first indoor set 40
Input 40A is connected by liquid side branch pipe 50 with high-pressure stop valve 15, and the input 41A of the second indoor set 41 is by liquid side point
Manifold 50 is connected with high-pressure stop valve 15；The outfan 40B of the first indoor set 40 is by gas side branch pipe 51 and low-pressure shutoff valve
17 connections, the outfan 41B of the second indoor set 41 is connected by gas side branch pipe 51 with low-pressure shutoff valve 17.
In summary it can be seen, the present invention by two outdoor heat exchangers by replacing an original outdoor heat exchanger so that many
On-line system, by cutting off an outdoor heat exchanger, reaches the purpose for reducing condenser area in cryogenic refrigeration, and realization will be
System pressure and aerofluxuss and suction temperature control are maintained in the reasonable scope, so as to reduce the risk that system returns liquid refrigerants, are protected
The reliability of system is demonstrate,proved；When multiple on-line system is heated in high temperature, by cutting off an outdoor heat exchanger, reduction evaporation is reached
Device area, realizes system pressure and aerofluxuss and suction temperature control being maintained in the reasonable scope, so as to reduce system high temperature
Keep Clear-High Voltage, it is ensured that the reliability of system.Therefore, a kind of multi-connected air conditioning system that the present invention is provided effectively improves multi-connected machine system
Reliability of the system when cryogenic refrigeration, high temperature are heated.
It will be appreciated by persons skilled in the art that to ensure that the first outdoor heat exchanger 2 and the second outdoor heat exchanger 4 are being made
There is good refrigeration when using for condenser, or have good heating effect when using as vaporizer, therefore, control
The cold medium flux for flowing 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 by the first electric expansion valve 12 with high-pressure stop valve 15, and the first electronics is swollen
Swollen valve 12 is used for the cold medium flux that the first outdoor heat exchanger 2 is flow through in control.In the same manner, the second outdoor heat exchanger 4 passes through the second electronics
Expansion valve 13 is connected with high-pressure stop valve 15, and the second electric expansion valve 13 is used for the coolant that second Room external heat exchanger 4 is flow through in control
Flow.
In the present embodiment, the gas-liquid separation for carrying out gas-liquid separation to the coolant for flowing into the compressor bank is also included
Device 14；4th end 7S of the input of the gas-liquid separator 14 and first cross valve 7 and the of second cross valve 8
Four end 8S connect, and the outfan of the gas-liquid separator 14 is connected with the air return end of the compressor bank 1.
In the present embodiment, also including oil eliminator 6；The input 6A of the oil eliminator 6 and the compressor bank 1
Outfan connects, first end 7D and the described 2nd 4 of the coolant outfan 6B of the oil eliminator 6 and first cross valve 7
The first end 8D connection of port valve 8.
The oily outfan 6C of the oil eliminator 6 is provided with the capillary tube 24 being connected with the air return end of the compressor bank 1；
The capillary tube 24 is used for high-pressure gaseous refrigerant and refrigerator oil to flowing out compressor bank 1 and separates, and makes height
Pressure gaseous coolant is discharged by the coolant outfan 6B of the oil eliminator 6, and the refrigerator oil isolated is passed through into the oil
The compressor bank 1 is flowed back to from the capillary tube 24 of device oil outfan 6C, and the capillary tube 24 is used to control the oil eliminator 6
Oil drain quantity.
A kind of multi-connected air conditioning system is specific as follows in the loop control freezed and heat：
Multi-connected air conditioning system refrigeration when, the power down of the first cross valve 7, the power down of the second cross valve 8, the first electric expansion valve
12 and second electric expansion valve 13 open under the control of electric-control system.The coolant one of the High Temperature High Pressure that compressor bank 1 is discharged
Lease making crosses the reducing pressure by regulating flow of the first electric expansion valves of Jing 12 after first the 7 to the first outdoor heat exchanger of cross valve 2 is condensed, and a part is passed through
To the reducing pressure by regulating flow of the second electric expansion valves of Jing 13 after the condensation of the second outdoor heat exchanger 4, two outdoor heat exchangers after second cross valve 8
Liquid refrigerants after reducing pressure by regulating flow is to after high-pressure stop valve 15 respectively to the first indoor set 40 after the shunting of liquid side branch pipe 50
With the devaporation of the second indoor set 41 heat absorption, gaseous coolant is become after evaporation endothermic and collaborates rear portion Jing through gas side branch pipe 51
Cross the first cross valve 7 and return to gas-liquid separator 14, a part returns to gas-liquid separator 14 after the second cross valve 8, final to return
Kind of refrigeration cycle is completed to compressor bank 1, the purpose of multiple on-line system refrigeration is reached.
Multi-connected air conditioning system is electric on the first cross valve 7 when heating, electricity, the first electric expansion valve on the second cross valve 8
12nd, the second electric expansion valve 13 is opened under the control of electric-control system.The coolant of the High Temperature High Pressure that compressor bank 1 is discharged is through the
One cross valve 7 is to after low-pressure shutoff valve 17 respectively to the first indoor set 40 and the second indoor set after gas side branch pipe 51 is shunted
41 condensations, condensed liquid refrigerants collaborates through liquid side branch pipe 50, and a part drops through the throttling of the first electric expansion valve 12
Gas-liquid separator 14 is returned to through the first cross valve 7 to after the evaporation endothermic of the first outdoor heat exchanger 2 after pressure, a part is through second
Gas-liquid is returned to after the second cross valve 8 to after the evaporation endothermic of the second outdoor heat exchanger 4 after the reducing pressure by regulating flow of electric expansion valve 13 to divide
From device 14, it is eventually returned to compressor bank 1 and completes to heat circulation, reaches the purpose that multiple on-line system is heated.
Multi-connected air conditioning system disclosed by the invention improves the reliability that multiple on-line system is heated in cryogenic refrigeration, high temperature
Detailed process is as follows：
Multi-connected air conditioning system is in cryogenic refrigeration, and air-cooled side ambient temperature is low, and two outdoor heat exchangers are without the need for all works
Condenser, at this point it is possible to close an outdoor heat exchanger, can close the second outdoor heat exchanger 4, and the of multi-connected air conditioning system
The power down of one cross valve 7, electricity on the second cross valve 8, the first electric expansion valve 12 is opened under the control of electric-control system, the second electronics
Expansion valve 13 is closed.The coolant of the High Temperature High Pressure that compressor bank 1 is discharged is all after the first cross valve 7 to the first outdoor heat exchange
The reducing pressure by regulating flow of the first electric expansion valves of Jing 12 after the condensation of device 2, liquid of the coolant after the reducing pressure by regulating flow of the first air cooling heat exchanger 2 is cold
Matchmaker is gone respectively after the shunting of liquid side branch pipe 50 after high-pressure stop valve 15 to the first indoor set 40 and the second indoor set 41
Evaporation endothermic, becomes gaseous coolant and passes through to be passed through again after low-pressure shutoff valve 17 behind the interflow of gas side branch pipe 51 after evaporation endothermic
First cross valve 7 returns to gas-liquid separator 14, is eventually returned to compressor bank 1 and completes kind of refrigeration cycle, reaches multiple on-line system refrigeration
Purpose.Also ensure that the system reliability freezed at low ambient temperatures simultaneously.
It should be noted that because electricity on the second cross valve 8, first end 8D of the second cross valve 8 and the 3rd end 8E are turned on,
The High Temperature High Pressure coolant that compressor bank 1 is excluded is blocked up in the second cross valve 8 by check valve 9.Due to the second electric expansion valve 13
Close, and the second end 8C of the second cross valve 8 and the 4th end 8S is turned on, the coolant in the second cross valve 8 empties back into gas-liquid point
From device 14, that is to say, that do not circulate coolant in the second cross valve 8.
When high temperature is heated, the heat exchanger of the first indoor set 40 and the second indoor set 41 is condensed multi-connected air conditioning system
Device, outdoor heat exchanger makees vaporizer, and air-cooled side ambient temperature is high, and evaporation effect is good, and the delivery temperature of compressor bank 1 is high, aerofluxuss
Pressure is high, can so reduce evaporator area.Such as using the first air cooling heat exchanger 2 as vaporizer, close the second outdoor and change
Hot device 4.Control process is as follows：Electricity on first cross valve 7, electricity on the second cross valve 8, the first electric expansion valve 12 is in electric-control system
Control under open, the second electric expansion valve 13 closes.The High Temperature High Pressure coolant that compressor bank 1 is discharged is through the first cross valve 7
Low-pressure shutoff valve 17 is arrived afterwards again after the shunting of gas side branch pipe 51 respectively to cold in the first indoor set 40 and the second indoor set 41
Solidifying, condensed coolant reaches the electric expansion valve 12 and second of high-pressure stop valve 15 and first behind the interflow of liquid side branch pipe 50
Between electric expansion valve 13, condensed coolant eventually passed and evaporated to the first air cooling heat exchanger 2 after the first electric expansion valve 12
Heat absorption, then returns to compressor bank 1 and completes whole refrigerant circulation after the first cross valve 7 is eventually returned to gas-liquid separator 14.
It should be noted that because electricity on the second cross valve 8, first end 8D of the second cross valve 8 and the 3rd end 8E are turned on,
The High Temperature High Pressure coolant that compressor bank 1 is excluded is blocked up in the second cross valve 8 by check valve.Because the second electric expansion valve 13 is closed
Close, the coolant in the second cross valve 8 empties back into gas-liquid separator 14, that is to say, that do not circulate coolant in the second cross valve 8.
Under the conditions of both the above, do not circulate coolant in the second outdoor cold heat exchanger 4, is equivalent to reduce outdoor heat exchange yet
Device area, reduces condensation effect, it is ensured that the certain high-pressure of system and low pressure, and control system returns liquid wind
Danger, greatly increases the reliability of system.
In summary it can be seen, the present invention by two outdoor heat exchangers by replacing an original outdoor heat exchanger so that many
On-line system, by cutting off an outdoor heat exchanger, reaches the purpose for reducing condenser area in cryogenic refrigeration, and realization will be
System pressure and aerofluxuss and suction temperature control are maintained in the reasonable scope, so as to reduce the risk that system returns liquid refrigerants, are protected
The reliability of system is demonstrate,proved；When multiple on-line system is heated in high temperature, by cutting off an outdoor heat exchanger, reduction evaporation is reached
Device area, realizes system pressure and aerofluxuss and suction temperature control being maintained in the reasonable scope, so as to reduce system high temperature
Keep Clear-High Voltage, it is ensured that the reliability of system.Therefore, a kind of multi-connected air conditioning system that the present invention is provided effectively improves multi-connected machine system
Reliability of the system when cryogenic refrigeration, high temperature are heated.
It will be appreciated by persons skilled in the art that hypertonia in multiple on-line system or too low can all affect multi-joint
The stable operation of machine system.Therefore, the present invention operation reliable and stable to ensure multi-connected air conditioning system, in above-described embodiment
In：
Also include for detecting pressure size between the outfan of the gas-liquid separator 14 and the air return end of the compressor bank 1
Low-pressure sensor 20 and for according to the pressure size of detection, controlling the outfan of gas-liquid separator 14 and the pressure
The low tension switch 21 that pipeline is switched on and off between the air return end of contracting unit 1；
The low tension switch 21 and the low-pressure sensor 20 are arranged on the outfan of the gas-liquid separator 14 and institute
State between the air return end of compressor bank 1.
It is low when the gas pressure between the air return end of the outfan of gas-liquid separator 14 and compressor bank 1 is less than preset value
Pressure pressure switch 21 disconnects automatically, and sends a pressure signal to electric-control system, so as to electric-control system is according to the pressure for receiving
Force signal takes corresponding protective measure, for example, turns off compressor bank 1.
Multi-connected air conditioning system is automatically controlled can also to pass through the system low-voltage that real-time detection low-pressure sensor 20 is fed back
Pressure, makes corresponding control or protects after the logic control computing for participating in system, such as low pressure is detected, by logic
The aperture size of computing real-time adjustment the first electric expansion valve 12 and the second electric expansion valve 13.
The input 6A of the oil eliminator 6 or coolant outfan 6B are provided with high-pressure switch 22 and high-pressure is passed
Sensor 23；
The high-pressure pressure sensor 23 is used for the pressure size of the outfan for detecting the compressor bank 1；The high pressure
Pressure switch 22 is used for the pressure size according to detection, controls the opening and closing of the outfan of compressor bank 1.
When the pressure of the expellant gas of compressor bank 1 looked into preset value, high-pressure switch 22 disconnects automatically, and to electricity
Control system sends a pressure signal, so as to electric-control system takes corresponding protective measure, example according to the pressure signal for receiving
Such as, compressor bank 1 is turned off.
Certainly multi-connected air conditioning system is automatically controlled can also pass through the system that real-time detection high-pressure pressure sensor 23 is fed back
High-pressure, makes corresponding control or protects after the logic control computing for participating in system, such as detect high-pressure, passes through
The aperture size of logical operationss real-time adjustment the first electric expansion valve 12 and the second electric expansion valve 13.
It should be noted is that, in above-described embodiment, the model of the first outdoor heat exchanger 2 and the second outdoor heat exchanger 4
Can be with identical, it is also possible to different.Wherein, preferred same model.First cross valve 7 and the model of the second cross valve 8 can with identical,
Can also be different.Do not limit herein.In the same manner, the model of the first electric expansion valve 12 and the second electric expansion valve 13 can phase
Together, it is also possible to different.Wherein, preferred same model.The compressor adopts frequency-changeable compressor, or constant speed compressor, or digital
Compressor.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
Term " first ", " second ", " the 3rd " " in description and claims of this specification and above-mentioned accompanying drawing
Four " etc. (if present) is the object for distinguishing similar, without for describing specific order or precedence.Should manage
The data that solution is so used can be exchanged in the appropriate case, so as to embodiments of the invention described herein can with except
Here the order beyond those for illustrating or describing is implemented.Additionally, term " comprising " and " having " and their any deformation,
It is intended to cover non-exclusive including.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope for causing.
Claims (7)
1. a kind of multi-connected air conditioning system, it is characterised in that include：
For providing a system to the compressor of coolant, the first outdoor heat exchanger that the refrigerant evaporation for making system absorbs heat or condenses
With the second outdoor heat exchanger, for make system refrigerant evaporation absorb heat or condense the first indoor set and the second indoor set, with institute
The high-pressure stop valve that the first indoor set input is connected with the second indoor set input is stated, it is defeated with first indoor set
Go out the low-pressure shutoff valve that end is connected with the second indoor set outfan, for control first outdoor heat exchanger is flow through
First electric expansion valve of cold medium flux, the second electronics of the cold medium flux for flowing through second outdoor heat exchanger for control is swollen
Swollen valve and the first cross valve, the second cross valve, check valve；The gentle side branch pipe of liquid side branch pipe；First indoor set
Input is connected by liquid side branch pipe with the high-pressure stop valve, and the input of the second indoor set is by the liquid side point
Manifold is connected with the high-pressure stop valve；The outfan of first indoor set is cut by gas side branch pipe with the low pressure
Only valve connection, the outfan of second indoor set is connected by gas side branch pipe with the low-pressure shutoff valve；It is separating of oil
Device；The input of the oil eliminator is connected with the outfan of the compressor bank, the coolant outfan of the oil eliminator with
The first end connection of the first end of first cross valve and second cross valve；
The quantity of the compressor is at least one, and the compressor can provide a system to cold-producing medium, and the compressor bank
Into compressor bank, and the outfan and air return end of each compressor are accumulated into the outfan and compressor bank of compressor bank
Air return end；
The input of first electric expansion valve is connected with the outfan of first outdoor heat exchanger, and first electronics is swollen
The outfan of swollen valve is connected with the high-pressure stop valve；
The input of second electric expansion valve is connected with the outfan of second outdoor heat exchanger, and second electronics is swollen
The outfan of swollen valve is connected with the high-pressure stop valve；
The first end of first cross valve is connected with the outfan of the compressor bank, the second end of first cross valve with
The input connection of first outdoor heat exchanger, the 3rd end and the low-pressure shutoff valve and the list of first cross valve
To the connection of valve input, the 4th end of first cross valve is connected with the air return end of the compressor bank；First four-way
Valve makes system enter refrigeration or heating mode for controlling first outdoor heat exchanger and second outdoor heat exchanger；
The first end of second cross valve is connected with the outfan of the compressor bank, the second end of second cross valve with
The input connection of second outdoor heat exchanger, the 3rd end of second cross valve connects with the outfan of the check valve
Connect；4th end of second cross valve is connected with the air return end of the compressor bank, and second cross valve is used to control system
The coolant of the second outdoor heat exchanger is cut off when controlling is cold；
The input of the check valve and the low-pressure shutoff valve and the three-terminal link of first cross valve, the check valve
Outfan and second cross valve three-terminal link, when the check valve is heated for system increase system coolant stream
It is logical, reduce system pressure loss；
For carrying out the gas-liquid separator of gas-liquid separation to the coolant for flowing into the compressor bank；
The input of the gas-liquid separator connects with the 4th end of first cross valve and the 4th end of second cross valve
Connect, the outfan of the gas-liquid separator is connected with the air return end of the compressor bank；
Multi-connected air conditioning system refrigeration when, the first cross valve power down, the second cross valve power down, the first electric expansion valve and second
Electric expansion valve is opened under the control of electric-control system；A coolant part for the High Temperature High Pressure that compressor bank is discharged is through the one or four
, to Jing the first electric expansion valve reducing pressure by regulating flow after the condensation of the first outdoor heat exchanger, a part is after the second cross valve to for port valve
Jing the second electric expansion valve reducing pressure by regulating flow after the condensation of two outdoor heat exchangers, the liquid refrigerants after two outdoor heat exchanger reducing pressure by regulating flow
To after high-pressure stop valve respectively to the first indoor set and the second indoor set devaporation heat absorption, evaporation after the shunting of liquid side branch pipe
Become gaseous coolant after heat absorption and collaborate rear portion through gas side branch pipe to return to gas-liquid separator through the first cross valve, one
Lease making is crossed after the second cross valve and returns to gas-liquid separator, is eventually returned to compressor bank and is completed kind of refrigeration cycle, reaches multiple on-line system
The purpose of refrigeration.
2. multi-connected air conditioning system according to claim 1, it is characterised in that
Also include the low pressure for detecting pressure size between the gas-liquid separator outfan and the compressor bank air return end
Pressure transducer and for according to the pressure size of detection, controlling the gas-liquid separator outfan and the compressor bank return-air
The low tension switch that passage is switched on and off between end；
The low tension switch and the low-pressure sensor are arranged on the gas-liquid separator outfan and the compressor bank
Between air return end.
3. multi-connected air conditioning system according to claim 1, it is characterised in that
The oily outfan of the oil eliminator is provided with the capillary tube being connected with the compressor bank air return end；
The capillary tube is used for high-pressure gaseous refrigerant and refrigerator oil to flowing out compressor bank and separates, and makes high-pressure gaseous cold
Matchmaker is discharged by the coolant outfan of the oil eliminator, by the refrigerator oil isolated by oil eliminator oil outfan
Capillary tube flow back to the compressor bank, and the capillary tube is used to control the oil drain quantity of the oil eliminator.
4. multi-connected air conditioning system according to claim 1, it is characterised in that
The coolant outfan of the oil eliminator input or oil eliminator is provided with high-pressure switch and high-pressure is passed
Sensor；
The high-pressure pressure sensor is used for the pressure size of the outfan for detecting the compressor bank；The high-pressure switch
For according to the pressure size of detection, controlling the opening and closing of the compressor bank outfan.
5. multi-connected air conditioning system according to claim 1, it is characterised in that
The compressor adopts frequency-changeable compressor, or constant speed compressor, or digital compressor.
6. multi-connected air conditioning system according to claim 1, it is characterised in that
The model of first outdoor heat exchanger and second outdoor heat exchanger is identical or different.
7. multi-connected air conditioning system according to claim 1, it is characterised in that
The model of first electric expansion valve and second electric expansion valve is identical or different.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410440837.8A CN104197582B (en) | 2014-09-01 | 2014-09-01 | Multi-connection air conditioning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410440837.8A CN104197582B (en) | 2014-09-01 | 2014-09-01 | Multi-connection air conditioning system |
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| CN104197582A CN104197582A (en) | 2014-12-10 |
| CN104197582B true CN104197582B (en) | 2017-04-19 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104748425B (en) * | 2015-03-31 | 2017-03-08 | 广东美的暖通设备有限公司 | The off-premises station assembly of multiple on-line system and multiple on-line system |
| CN106524330A (en) * | 2016-12-06 | 2017-03-22 | 珠海格力电器股份有限公司 | Air conditioner outdoor unit, air conditioner unit and refrigeration control method and heating control method of air conditioner unit |
| CN107178833B (en) * | 2017-05-31 | 2023-12-05 | 珠海格力电器股份有限公司 | Heat recovery external machine system and air conditioning system |
| CN107842962B (en) * | 2017-12-20 | 2025-01-03 | 江苏阅源机电工程有限公司 | A variable flow air conditioning system |
| CN112833481A (en) * | 2019-11-22 | 2021-05-25 | 青岛海尔空调电子有限公司 | Air supplement and enthalpy increase device for air-conditioning system and air-conditioning system |
| CN112815398B (en) * | 2021-01-18 | 2022-01-04 | 珠海格力电器股份有限公司 | Air conditioner and control method thereof |
| CN116265826A (en) * | 2021-12-16 | 2023-06-20 | 山东朗进科技股份有限公司 | Triple air conditioner hot water system |
| CN115342492A (en) * | 2022-08-26 | 2022-11-15 | 青岛海尔中央空调有限公司 | Method and device for controlling multi-connected air conditioner, and multi-connected air conditioner |
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