CN101737856A - Multi-connection air conditioner and freezing medium leakage diagnosing method thereof - Google Patents
Multi-connection air conditioner and freezing medium leakage diagnosing method thereof Download PDFInfo
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- CN101737856A CN101737856A CN200810190547A CN200810190547A CN101737856A CN 101737856 A CN101737856 A CN 101737856A CN 200810190547 A CN200810190547 A CN 200810190547A CN 200810190547 A CN200810190547 A CN 200810190547A CN 101737856 A CN101737856 A CN 101737856A
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- cold
- air conditioner
- producing medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/50—Load
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
- F25B2500/222—Detecting refrigerant leaks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2106—Temperatures of fresh outdoor air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2113—Temperatures of a suction accumulator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention relates to a multi-connection air conditioner and a freezing medium leakage diagnosing method thereof. A situation that parts of a plurality of outdoor machines are in thermal running but at lease one outdoor machine is stopped may occur on the basis of the running loads of the indoor side machines. Freezing medium discharged by the outdoor machines in running is provided to each indoor machines through a high-pressure pipe that are connected with a plurality of indoor machines. The inside of the outdoor machines are provided with components for controlling the flowing of the freezing medium, however, when the components are failed, the freezing medium will be leaked from the outdoor machines in running to the inner of an outdoor machine that is stopped. The pressure or temperature at a low pressure side is changed according to the freezing medium flowing into the inner of the outdoor machine that is stopped, and a sensor can be used for detecting the changing and diagnosing the leakage of the freezing medium in the outdoor machine that is stopped.
Description
Technical field
The present invention relates to a kind of multi-connected air conditioner and freezing medium leakage diagnosing method thereof, relate in particular to the multi-connected air conditioner and the freezing medium leakage diagnosing method thereof of the cold-producing medium leakage that takes place in the off-premises station that is used for diagnosing a plurality of off-premises station operations to be stopped.
Background technology
Because the living space is tending towards maximizing in the house, and because therefore the influence that the air conditioner surroundings self in the commercial building changes is extensive use of the system that carries out air conditioning by a plurality of indoor sets.And the user improves day by day to the requirement of the air handling capacity of air conditioner, so that can regulate the air of the roomy interior space, rapid more the adaptation because inhabitation people increase etc. are former thereby the air conditioner surroundings of variation more rapidly.
In view of the above, developing multi-connected air conditioner, this air conditioner has the outdoor unit that has made up a plurality of off-premises stations, guarantees powerful service ability thus, thereby increases or reduce the service ability of a plurality of off-premises stations according to the operating load of indoor.
Outdoor unit is connected with the indoor by refrigerant piping.A plurality of off-premises stations have respectively and are used for to indoor discharging refrigerant that is connected by refrigerant piping and the refrigerant loop that is used to suck the cold-producing medium of supplying with by refrigerant piping.Comprise a plurality of parts that are used to control flow of refrigerant in this refrigerant loop.Yet the building block of refrigerant loop may break down, just because of this fault, the cold-producing medium of operating off-premises station may flow into the off-premises station that has stopped.Therefore, need take measures to tackle this problem.
Summary of the invention
The purpose of one aspect of the present invention is to provide the multi-connected air conditioner and the freezing medium leakage diagnosing method thereof of the cold-producing medium leakage that takes place in a kind of off-premises station that is used for diagnosing a plurality of off-premises station operations to be stopped.
To achieve these goals, comprise a plurality of off-premises stations and a plurality of indoor set according to embodiment of the invention multi-connected air conditioner, and utilize refrigerant piping to connect described a plurality of off-premises station and described a plurality of indoor set, also comprise leak diagnostic apparatus, this leak diagnostic apparatus at least one off-premises station in described a plurality of off-premises stations carries out heating operation, and all the other off-premises stations are when out of service, relatively variable value and the outdoor temperature that changes according to the refrigerant amount that flow into off-premises station inside out of service judges that thus cold-producing medium leaks.
Described leak diagnostic apparatus is arranged on described off-premises station out of service.
Described leak diagnostic apparatus comprise the low-pressure side that is arranged on described off-premises station out of service first sensor, outdoor temperature sensor, judge the control part that cold-producing medium leaks according to the output of described two sensors.
Described first sensor is the pressure sensor of the suction pressure that detects gas-liquid separator, and described gas-liquid separator is connected in the compressor of described off-premises station out of service.
Described first sensor is the temperature sensor of the inlet temperature that detects gas-liquid separator, and described gas-liquid separator is connected in the compressor of described off-premises station out of service.
Described leak diagnostic apparatus comprises the pressure sensor of the suction pressure that detects the gas-liquid separator be arranged on described off-premises station low-pressure side out of service, the temperature sensor that detects the inlet temperature of described gas-liquid separator, outdoor temperature sensor, and judges the control part that cold-producing medium leaks according to the output of described three sensors.
To achieve these goals, multi-connected air conditioner according to the embodiment of the invention utilizes high-voltage tube and low-voltage tube to be connected with the outside and the indoor that is provided with a plurality of indoor sets of a plurality of off-premises stations, and comprise leak diagnostic apparatus, this leak diagnostic apparatus at least one off-premises station in described a plurality of off-premises stations carries out heating operation, when simultaneously at least one off-premises station was out of service, the relation that flow into variable value that the refrigerant amount of off-premises station inside out of service changes and outdoor temperature according to the described high-voltage tube via the off-premises station that is connected heating operation was judged the leakage of cold-producing medium.
Described off-premises station out of service comprises compressor, be arranged on check-valves, cross valve on the cold-producing medium leakage paths, be used for machine oil be recovered to the suction side of described compressor the machine oil bypass loop, be connected in the gas-liquid separator of the suction side of described compressor, a reference value that described leak diagnostic apparatus comprises the first sensor of the suction side that is arranged on the described gas-liquid separator that is connected in described low-voltage tube, set according to the output and the corresponding described outdoor temperature of described first sensor is judged the control part that cold-producing medium leaks.
Described first sensor is pressure sensor or temperature sensor.
Described machine oil bypass loop is used for via described cross valve and check-valves and the described compressor of refrigerant flow direction and the described gas-liquid separator of the described operating off-premises station that flows into.
To achieve these goals, control the operation quantity of a plurality of off-premises stations according to the indoor operating load according to the multi-connected air conditioner of the embodiment of the invention, and comprise the leak diagnostic apparatus that is used for judging that the cold-producing medium that takes place in the off-premises station that described a plurality of off-premises station operation is stopped leaks, described leak diagnostic apparatus comprises and is used to detect because flow into the cold-producing medium of off-premises station out of service and the suction pressure of the gas-liquid separator that changes or the sensor of inlet temperature from the heating operation off-premises station, be used to detect the outdoor temperature sensor of outdoor temperature, judge the control part that the cold-producing medium of described off-premises station out of service leaks according to the output valve of described two sensors.
To achieve these goals, the freezing medium leakage diagnosing method according to the multi-connected air conditioner of the embodiment of the invention comprises step: judge whether to be heating operation; Detect outdoor temperature; And the variable value and the outdoor temperature that relatively change according to the refrigerant amount that flow into gas-liquid separator in the cold-producing medium that flows to off-premises station out of service, judge that thus the cold-producing medium of described off-premises station out of service leaks.
Described variable value is the saturation temperature corresponding to the suction pressure of described gas-liquid separator, when described variable value during more than or equal to the described outdoor temperature and the first difference sum, is judged as the cold-producing medium leakage has taken place.
Described variable value is the inlet temperature of described gas-liquid separator, when described variable value during more than or equal to the described outdoor temperature and the second difference sum, is judged as the cold-producing medium leakage has taken place.
To achieve these goals, freezing medium leakage diagnosing method according to the multi-connected air conditioner of the embodiment of the invention, described multi-connected air conditioner utilizes high-voltage tube and low-voltage tube to be connected with the outside of a plurality of off-premises stations and is provided with the indoor of a plurality of indoor sets, comprises step: judge whether operational mode is heating operation; At least one off-premises station carries out heating operation in described a plurality of off-premises stations, and when having at least one off-premises station out of service, variable value and the outdoor temperature that changes according to the refrigerant amount that flow in the gas-liquid separator that is arranged on described off-premises station low-pressure side out of service relatively; The cold-producing medium of judging described off-premises station out of service according to described comparative result leaks.
Also comprise step: show that the information of leaking takes place described cold-producing medium; Whether the leak time of judging described cold-producing medium surpasses the scheduled time; If described leak time surpasses the scheduled time, then force the off-premises station in out of service.
In sum, the present invention be arranged on by utilization off-premises station out of service low-pressure side sensor and can be easy to diagnose out the leakage of cold-producing medium.
And, when the present invention surpasses the scheduled time when the cold-producing medium leak time, force the operation of the off-premises station in out of service, can protect off-premises station thus.
Description of drawings
Fig. 1 is the pie graph of multi-connected air conditioner;
Fig. 2 is the detailed pie graph according to the outdoor unit shown in Figure 1 of the embodiment of the invention;
Fig. 3 is the block diagram according to multi-connected air conditioner of the present invention;
Fig. 4 is the cold-producing medium loop direction of expression multi-connected air conditioner according to the present invention when one of them another off-premises station of off-premises station heating operation is out of service and the schematic diagram of the flow direction of leakage of refrigerant;
Fig. 5 is the flow chart that is used to illustrate according to the freezing medium leakage diagnosing method of the multi-connected air conditioner of the embodiment of the invention;
Fig. 6 is the detailed pie graph of outdoor unit shown in Figure 1 according to another embodiment of the present invention;
Fig. 7 is used to illustrate the flow chart of the freezing medium leakage diagnosing method of multi-connected air conditioner according to another embodiment of the present invention.
Main symbol description: 100 is outdoor unit, and 110,120 is off-premises station, and 301 is high-voltage tube, and 302 is low-voltage tube.
The specific embodiment
Below, describe in detail according to embodiments of the invention with reference to accompanying drawing.
As shown in Figure 1, multi-connected air conditioner is by constituting by the outer unit 100 of refrigerant piping 301,302 junction chambers and a plurality of indoor set 210,220,230,240.At this, outdoor unit and a plurality of indoor set can utilize not shown order wire that outside control part and indoor control part are communicated.This structure can be used known structure.
Outdoor unit 100 comprises two off-premises stations, and promptly off-premises station 110,120.At this, the quantity of the off-premises station that unit comprised outside the delimit chamber not, and each off-premises station do not required to have identical air handling capacity yet, therefore can set the air handling capacity of this off-premises station according to the pairing indoor air-conditioned environment of off-premises station.
In refrigerant loop, a plurality of off-premises stations 110,120 are owned together and are used for supplying with the high-voltage tube 301 of high-pressure refrigerant and being used for receiving from the indoor low-voltage tube 302 of low pressure refrigerant to the indoor when heating operation.
Owing to the indoor operating load along with the indoor set quantity that is in running status changes, so need not to move or to stop simultaneously a plurality of off-premises stations 110,120 simultaneously.Therefore, for a plurality of off-premises stations, decide operation part off-premises station or move whole off-premises stations according to operating load.
Fig. 2 is the detailed pie graph according to the outdoor unit shown in Figure 1 of the embodiment of the invention, and Fig. 3 is the block diagram according to multi-connected air conditioner of the present invention.
With reference to Fig. 2, illustrated a plurality of off-premises station 110,120 is structurally identical.
Each off-premises station 110,120 has variable conpacitance compressor 111,121, outdoor heat converter 112,122, outdoor fan 113,123.
The discharge side of each compressor 111,121 is provided with: lubricant separator 111a, 121a; Be used to prevent the check-valves 116,126 of cold-producing medium adverse current; Change the cross valve 115,125 of refrigerant flow direction according to operational mode.
During heating operation, cross valve 115,125 is supplied with high-pressure refrigerants to high-voltage tube 301, and during refrigerating operaton, cross valve 115,125 is supplied with high-pressure refrigerants to outdoor heat converter 112,122.For this reason, the switching channel by the slide block shift position of cross valve 115,125 inside.The concrete structure of this cross valve can adopt known structure.
Each off-premises station 110,120 comprises the gas-liquid separator 114,124 of the suction side that is connected in compressor.
The inlet of gas-liquid separator 114,124 is connected in cross valve 115,125 by shunting circuit A1, A2, and outlet is connected in the suction side of compressor.The low pressure refrigerant that to supply with from the indoor by shunting circuit A1, A2 is drawn into the inside of gas-liquid separator 114,124.Be provided for detecting the pressure sensor 117,127 of refrigerant pressure at the inlet of gas-liquid separator.The gaseous refrigerant that goes out in gas-liquid separator separates is provided to the suction side of compressor.
Connect the discharge side of compressor 111,121 and hot-air bypath loop B1, the B2 of suction side and be provided with the bypass valve 118,128 that is used to open and close passage.
And the machine oil bypass loop C1, the C2 that connect between compressor discharge side and the suction side carry isolated machine oil in lubricant separator 111a, 121a to the compressor suction side, are provided for reclaiming the passage of machine oil thus.
Still unaccounted symbol the 119, the 129th is used to control the motor-driven valve by the refrigerant flow direction of low-voltage tube 302 supplies during heating operation, this motor-driven valve plays to intercept cold-producing medium when affiliated off-premises station is in the operation halted state.
The part of each above-mentioned off-premises station 110,120 all is electrically connected on outdoor control part 100A, and controls each part according to this outdoor control part.Though, only enumerated the outdoor control part form of a plurality of off-premises stations of control totally in the present embodiment, be not limited thereto.For example, also can adopt and communicate between a plurality of outdoor control part of controlling each off-premises station respectively and control the form of service ability.
If the operation quantity of indoor indoor set changes, then relevant therewith operating load also can change.In view of the above, outdoor control part 100A is at the indoor operating load and the service ability of appropriate change off-premises station can be moved the part off-premises station and stop the part off-premises station in a plurality of off-premises stations.
Fig. 4 is the schematic diagram of expression according to the flow direction of cold-producing medium loop direction when one of them another off-premises station of off-premises station heating operation is out of service and leakage of refrigerant in the multi-connected air conditioner of the present invention.
With reference to Fig. 4, it shows off-premises station 110 heating operations and another off-premises station 120 situation out of service.
In the off-premises station 110 of heating operation, the cold-producing medium of discharging from compressor 111 is transported to cross valve 115 through check-valves 116.Cross valve 115 corresponding heating operations and start its inner slide block are supplied with to high-voltage tube 301 thus and are flow into its inner cold-producing medium.The cold-producing medium of high-voltage tube 301 of flowing through will be provided to operating indoor pusher side (with reference to solid arrow).
The low pressure refrigerant of discharging from operating indoor pusher side is fed into each off-premises station 110,120 via low-voltage tube 302.At this moment, the motor-driven valve 119 of operating off-premises station 110 is in opening, and the motor-driven valve 129 of off-premises station 120 out of service is in closed condition.
In view of the above, the cold-producing medium of supplying with by low-voltage tube 302 carries out heat exchange with outdoor air via motor-driven valve 119 in outdoor heat converter 112, flows through shunting circuit A1 subsequently and is inhaled into gas-liquid separator 114 inside.Then, be inhaled into compressor 111 inside (with reference to dotted arrow) at gas-liquid separator 114 inner separated gaseous refrigerants.
Because the motor-driven valve 129 of off-premises station 120 out of service is in closed condition, therefore the cold-producing medium of supplying with by low-voltage tube 302 can not be delivered to outdoor heat converter 122.And, because compressor 121 is out of service, therefore can discharging refrigerant.
But the cross valve 125 as a building block of the refrigerant loop of off-premises station out of service 120 if its slide block breaks, then will flow into the discharge side of compressor 121 via the high-pressure refrigerant of high-voltage tube 301.Flowing into the high-pressure refrigerant of discharging side may can not be intercepted to discharging side inflow because of check-valves 126 again.Yet if this check-valves 126 also breaks down, high-pressure refrigerant will flow into the discharge side of compressor, subsequently through being connected in the machine oil bypass loop C2 of lubricant separator.The part high-pressure refrigerant of the machine oil bypass loop of flowing through C2 flow into compressor out of service 121 inside, and all the other high-pressure refrigerants flow into gas-liquid separator 124 inside.(with reference to dash-dot arrows).
So, if should flow into compressor 121 inside that stop owing to leaking, then can and build up in this compressor internal condensation one-tenth liquid state by the high-pressure refrigerant that high-voltage tube 301 is supplied with to indoor pusher side.Thus, when starting compressor 121, machine oil is bubbled (foam), thereby cause because of the not enough insufficient lubrication that causes of the inner machine oil of compressor.
And, the high-pressure refrigerant that flow into gas-liquid separator 124 inside is condensed into liquid state and a large amount of the accumulation, under this state, if start compressor 121, then be inhaled into compressor, and can cause poor starting or compressor fault owing to accumulate in gas-liquid separator 124 interior liquid refrigerants in a large number.
And, also leak the lack of refrigerant phenomenon that causes in the operating off-premises station in the operating off-premises station because of high-pressure refrigerant.Because lack of refrigerant, the compressor discharge temperature of operating indoor set rises, and the suction pressure reduction, thereby causes compression performance to descend.
So, at the problem of each building block cisco unity malfunction, requirement can diagnose high-pressure refrigerant to flow into and the phenomenon of leakage voluntarily in off-premises station out of service.
According to present embodiment, to flow into off-premises station out of service 120 inner and when filling into the gas-liquid separator 124 of low-pressure side, the pressure that gas-liquid separator 124 will occur changes when high-pressure refrigerant.At this moment, detects suction pressure by the pressure sensor 127 that is arranged at gas-liquid separator 124 inlet, if corresponding to the saturation temperature of this suction pressure more than or equal to outdoor temperature T by outdoor temperature sensor 122a detection
0With the first difference t1 sum, then be judged as the cold-producing medium leakage takes place.This cold-producing medium leaks judgement to be undertaken by outdoor control part 100A.
Fig. 5 is the flow chart that is used to illustrate according to the freezing medium leakage diagnosing method of the multi-connected air conditioner of the embodiment of the invention, below describes with the emphasis that is controlled to be according to outdoor control part 100A.
At first, judge operational mode, if heating operation, then corresponding heating operation circulates and starts each building block, for example drive each valve that is arranged on the refrigerant loop, and drive compressor (501), (503), (505) of the off-premises station that is in running status in order to control flow of refrigerant.
Then, outdoor control part 100A communicates by letter with indoor control part 210A, 220A, 230A, 240A, judges whether to want part off-premises station out of service (507) according to the indoor operating load thus.According to its judged result, when operating load needs off-premises station out of service more greatly and not, judge whether whole system out of service (508).If its judged result then turns back to step 507 for continuing the operation whole system.
If judged result is a whole system out of service, then stop each building block (510) of off-premises station.
Need stop the part off-premises station if the indoor operating load is little, then each building block of needs off-premises station 120 out of service is controlled, as stop compressor, close motor-driven valve 129 etc., and receive pressure sensor 127 outputs signal and and find out saturation temperature (509) by the form that retrieval stores in advance corresponding to the suction pressure of gas-liquid separator 124.Then, outdoor control part 100A is with saturation temperature that retrieves and the outdoor temperature T that detects by outdoor temperature sensor 122a
0Compare with the first difference t1 sum, judge whether to leak (511), (513) thus.If saturation temperature is more than or equal to outdoor temperature T
0With the first difference t1 sum, then be judged as the cold-producing medium leakage has taken place, and show leak condition by display part 102, utilize the leak time calculator simultaneously and measure leak time (515).
Then; judge whether to stop whole system (517); if its judged result is not for out of service; judge that then cold-producing medium leaks the leak time that takes place to measure the back and whether surpasses predetermined maximum running time (519); when the leak time of measuring surpasses maximum during running time as yet; turn back to step 513, and when the leak time of measuring surpasses maximum running time, force the off-premises station (521) in out of service for the protection off-premises station.
In addition, leak from the cold-producing medium that operating off-premises station flow into off-premises station inside out of service if cold-producing medium takes place, then as the above embodiments, the inlet pressure of gas-liquid separator changes, and inlet temperature also changes subsequently.Based on this point, can not rely on pressure sensor and use inlet temperature sensor, judge that according to the inlet temperature that detects by this temperature sensor cold-producing medium leaks.In view of the above, describe to judge that according to the inlet temperature of gas-liquid separator method that cold-producing medium leaks is attached most importance among the next embodiment.
Fig. 6 is the detailed pie graph of outdoor unit shown in Figure 1 according to another embodiment of the present invention, and Fig. 7 is used to illustrate the flow chart of the freezing medium leakage diagnosing method of multi-connected air conditioner according to another embodiment of the present invention.
Among another embodiment that describes with reference to Fig. 6 and Fig. 7,, therefore omit repeat specification, describe and attach most importance to distinctive points owing to have formerly with reference to most of technical characterictic of Fig. 2 to Fig. 5 explanation.
The formation of the off-premises station shown in Fig. 6 is compared with the formation of Fig. 2, and it is all identical that other formations are set except replacing pressure sensor 117,127 at the inlet of gas-liquid separator 114,124 temperature sensor 117a, the 127a.Therefore, each building block to same-sign only briefly explains.
The operation method that constitutes a plurality of off-premises station 110a, the 120a of outdoor unit 100 is to be carried out by outdoor control part.This control method realizes on a 50-50 basis with embodiment formerly.For example, when an off-premises station 110a carries out heating operation, and another off-premises station 120a is when out of service, and its refrigerant flow direction is identical with refrigerant flow direction shown in Figure 4.At this,,, make high-pressure refrigerant flow to compressor 121 suction sides and gas-liquid separator 124 via machine oil bypass loop C2 too because of the fault of cross valve 125 and check-valves 126 for off-premises station 120a out of service.
So when the cold-producing medium leakage took place, the inlet temperature of gas-liquid separator 124 changed, and the variation of this inlet temperature is detected by temperature sensor 127a and is provided to outdoor control part.In view of the above, outdoor control part is worked as the inlet temperature of gas-liquid separator 124 more than or equal to the outdoor temperature T that detects by outdoor temperature sensor 122a
0During with the second difference t2 (greater than first difference) sum, be judged as the cold-producing medium leakage takes place.
As shown in Figure 7, if operational mode is a heating operation, then the control flow of refrigerant drives each valve that is arranged on refrigerant loop and compressor (601), (603), (605) that are in the off-premises station of running status for corresponding heating operation circulation.
Then, outdoor control part is communicated by letter with each indoor control part, judges whether to want part off-premises station out of service (607) according to the indoor operating load thus.According to its judged result, when operating load needs off-premises station out of service more greatly and not, judge whether whole system out of service (608).If its judged result then turns back to step 607 for continuing the operation whole system.
Declaring as resolute result is whole system out of service, then stops the driving (610) of each building block of off-premises station.
When the indoor operating load not quite need stop the part off-premises station, to control each building block of needs off-premises station 120 out of service, as stop compressor, close motor-driven valve 129 etc., and receive the inlet temperature (609) of the gas-liquid separator 124 of temperature sensor 127a output.Then, outdoor control part is with inlet temperature and the outdoor temperature T that detects by outdoor temperature sensor 122a
0Compare with the second difference t2 sum, judge whether to leak (611), (613) thus.If the inlet temperature of gas-liquid separator 124 is more than or equal to outdoor temperature T
0With the second difference t2 sum, then be judged as the cold-producing medium leakage has taken place, and show leak condition by display part 102, utilize the leak time calculator to measure leak time (615) simultaneously.
Then; judge whether to stop whole system (617); if its judged result is not for out of service; judge that then cold-producing medium leaks the leak time that takes place to measure the back and whether surpasses predetermined maximum running time (619); when the leak time of measuring surpasses maximum during running time as yet; turn back to step 613, and when the leak time of measuring surpasses maximum running time, force the off-premises station (621) in out of service for the protection off-premises station.
Though not explanation in the above-described embodiments, but also can pressure sensor and temperature sensor be set simultaneously at the inlet of gas-liquid separator, consider the saturation temperature of the pressure that detects corresponding to pressure sensor thus simultaneously and judge that by the inlet temperature that temperature sensor detects cold-producing medium leaks, thereby carry out the processing that corresponding cold-producing medium leaks according to this judged result.
Claims (16)
1. multi-connected air conditioner, it comprises a plurality of off-premises stations and a plurality of indoor set, and utilize refrigerant piping to connect described a plurality of off-premises station and described a plurality of indoor set, it is characterized in that comprising leak diagnostic apparatus, this leak diagnostic apparatus at least one off-premises station in described a plurality of off-premises stations carries out heating operation, and all the other off-premises stations are when out of service, and relatively variable value and the outdoor temperature that changes according to the refrigerant amount that flow into off-premises station inside out of service judges that thus cold-producing medium leaks.
2. multi-connected air conditioner according to claim 1 is characterized in that described leak diagnostic apparatus is arranged on described off-premises station out of service.
3. multi-connected air conditioner according to claim 2, it is characterized in that described leak diagnostic apparatus comprise the low-pressure side that is arranged on described off-premises station out of service first sensor, outdoor temperature sensor, judge the control part that cold-producing medium leaks according to the output of described two sensors.
4. multi-connected air conditioner according to claim 3 is characterized in that the pressure sensor of described first sensor for the suction pressure that detects gas-liquid separator, and described gas-liquid separator is connected in the compressor of described off-premises station out of service.
5. multi-connected air conditioner according to claim 3 is characterized in that the temperature sensor of described first sensor for the inlet temperature that detects gas-liquid separator, and described gas-liquid separator is connected in the compressor of described off-premises station out of service.
6. multi-connected air conditioner according to claim 2 is characterized in that described leak diagnostic apparatus comprises the pressure sensor of the suction pressure that detects the gas-liquid separator be arranged on described off-premises station low-pressure side out of service, the temperature sensor that detects the inlet temperature of described gas-liquid separator, outdoor temperature sensor, and judges the control part that cold-producing medium leaks according to the output of described three sensors.
7. multi-connected air conditioner, the indoor that it utilizes high-voltage tube and low-voltage tube to be connected with the outside of a plurality of off-premises stations and to be provided with a plurality of indoor sets, it is characterized in that comprising leak diagnostic apparatus, this leak diagnostic apparatus at least one off-premises station in described a plurality of off-premises stations carries out heating operation, when simultaneously at least one off-premises station was out of service, the relation that flow into variable value that the refrigerant amount of off-premises station inside out of service changes and outdoor temperature according to the described high-voltage tube via the off-premises station that is connected heating operation was judged the leakage of cold-producing medium.
8. multi-connected air conditioner according to claim 7, it is characterized in that described off-premises station out of service comprise compressor, be arranged on check-valves, cross valve on the cold-producing medium leakage paths, be used for machine oil be recovered to described compressor suction side the machine oil bypass loop, be connected in the gas-liquid separator of the suction side of described compressor
The a reference value that described leak diagnostic apparatus comprises the first sensor of the suction side that is arranged on the described gas-liquid separator that is connected in described low-voltage tube, set according to the output and the corresponding described outdoor temperature of described first sensor is judged the control part that cold-producing medium leaks.
9. multi-connected air conditioner according to claim 8 is characterized in that described first sensor is pressure sensor or temperature sensor.
10. multi-connected air conditioner according to claim 8 is characterized in that described machine oil bypass loop is used for via described cross valve and check-valves and the described compressor of refrigerant flow direction and the described gas-liquid separator of the described operating off-premises station that flows into.
11. multi-connected air conditioner, it controls the operation quantity of a plurality of off-premises stations according to the indoor operating load, it is characterized in that comprising the leak diagnostic apparatus that is used for judging that the cold-producing medium that takes place in the off-premises station that described a plurality of off-premises station operation is stopped leaks, described leak diagnostic apparatus comprises and is used to detect because flow into the cold-producing medium of off-premises station out of service and the suction pressure of the gas-liquid separator that changes or the sensor of inlet temperature from the heating operation off-premises station, be used to detect the outdoor temperature sensor of outdoor temperature, judge the control part that the cold-producing medium of described off-premises station out of service leaks according to the output valve of described two sensors.
12. the freezing medium leakage diagnosing method of a multi-connected air conditioner is characterized in that comprising step:
Judge whether to be heating operation;
Detect outdoor temperature; And
Variable value and the outdoor temperature that changes according to the refrigerant amount that flow into gas-liquid separator in the cold-producing medium that flows to off-premises station out of service relatively judges that thus the cold-producing medium of described off-premises station out of service leaks.
13. the freezing medium leakage diagnosing method of multi-connected air conditioner according to claim 12, it is characterized in that described variable value is the saturation temperature corresponding to the suction pressure of described gas-liquid separator, when described variable value during, be judged as the cold-producing medium leakage has taken place more than or equal to the described outdoor temperature and the first difference sum.
14. the freezing medium leakage diagnosing method of multi-connected air conditioner according to claim 12, it is characterized in that described variable value is the inlet temperature of described gas-liquid separator, when described variable value during, be judged as the cold-producing medium leakage has taken place more than or equal to the described outdoor temperature and the second difference sum.
15. the freezing medium leakage diagnosing method of a multi-connected air conditioner, described multi-connected air conditioner utilize high-voltage tube and low-voltage tube to be connected with the outside of a plurality of off-premises stations and are provided with the indoor of a plurality of indoor sets, it is characterized in that comprising step:
Judge whether operational mode is heating operation;
At least one off-premises station carries out heating operation in described a plurality of off-premises stations, and when having at least one off-premises station out of service, variable value and the outdoor temperature that changes according to the refrigerant amount that flow in the gas-liquid separator that is arranged on described off-premises station low-pressure side out of service relatively;
The cold-producing medium of judging described off-premises station out of service according to described comparative result leaks.
16. the freezing medium leakage diagnosing method of multi-connected air conditioner according to claim 15 is characterized in that also comprising step:
Show that the information of leaking takes place described cold-producing medium;
Whether the leak time of judging described cold-producing medium surpasses the scheduled time;
If described leak time surpasses the scheduled time, then force the off-premises station in out of service.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020080115266A KR20100056204A (en) | 2008-11-19 | 2008-11-19 | Multi-air-conditioner and method for diagnosising refrigerants leakage thereof |
| KR10-2008-0115266 | 2008-11-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101737856A true CN101737856A (en) | 2010-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810190547A Pending CN101737856A (en) | 2008-11-19 | 2008-12-30 | Multi-connection air conditioner and freezing medium leakage diagnosing method thereof |
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| Country | Link |
|---|---|
| KR (1) | KR20100056204A (en) |
| CN (1) | CN101737856A (en) |
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- 2008-11-19 KR KR1020080115266A patent/KR20100056204A/en not_active Application Discontinuation
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