WO2017068902A1 - 空調システム - Google Patents

空調システム Download PDF

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Publication number
WO2017068902A1
WO2017068902A1 PCT/JP2016/077763 JP2016077763W WO2017068902A1 WO 2017068902 A1 WO2017068902 A1 WO 2017068902A1 JP 2016077763 W JP2016077763 W JP 2016077763W WO 2017068902 A1 WO2017068902 A1 WO 2017068902A1
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WO
WIPO (PCT)
Prior art keywords
way switching
switching valve
outdoor unit
pressure
heating cycle
Prior art date
Application number
PCT/JP2016/077763
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
隆博 加藤
Original Assignee
三菱重工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Priority to CN201680043745.3A priority Critical patent/CN107850352A/zh
Priority to ES16857220T priority patent/ES2732660T3/es
Priority to EP16857220.4A priority patent/EP3315877B1/de
Publication of WO2017068902A1 publication Critical patent/WO2017068902A1/ja

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Classifications

    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • 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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F25B2313/0253—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units in parallel arrangements
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02792—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using reversing valve changing the refrigerant flow direction due to pressure differences of the refrigerant and not by external actuation
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2507—Flow-diverting valves

Definitions

  • the present invention relates to an air conditioning system in which a plurality of outdoor units including a compressor, a four-way switching valve, and an outdoor heat exchanger are connected in parallel to a refrigeration cycle.
  • a conventional air conditioning system in an air conditioning system in which a plurality of compressors are installed in an outdoor unit, if any one of the compressors fails or a plurality of outdoor units are used for one refrigeration cycle
  • the air conditioning system can be operated by operating a normal compressor or outdoor unit in order to avoid a situation where the air conditioning system will be completely stopped. Air conditioning systems with continuous backup operation functions are provided.
  • the position of the four-way switching valve is set to the cooling cycle position or the heating cycle in order to make the operation mode of the outdoor units the same during backup operation.
  • the four-way selector valve can be switched by operating the remaining compressors even if some of them are broken.
  • the compressor of the outdoor unit cannot be operated, and thus the four-way selector valve may not be synchronized.
  • the slide valve body is slid so that a predetermined value (normally 0, although depending on the product specifications of the four-way switching valve). It is necessary to ensure a high and low pressure difference of 3 MPa) or more. However, in the outdoor unit where the compressor is broken, the high / low pressure difference cannot be secured, so the four-way switching valve cannot be switched synchronously to the heating cycle position, and as a result, the system cannot be operated. was there.
  • JP-A-6-341742 Patent No. 3203096
  • Patent Document 1 since the system disclosed in Patent Document 1 has to stop the operation of the system once an abnormality occurs, for example, when the cooling operation is performed in the cooling cycle, when the operation is switched to the heating operation, the failure is caused as it is.
  • the four-way switching valve of the outdoor unit cannot be switched from the cooling cycle position to the heating cycle position, and the system must be stopped once, and how to synchronize the direction of the four-way switching valve of each outdoor unit. It did not disclose a specific method or means for the above.
  • the present invention has been made in view of such circumstances, and even when a compressor of any one of a plurality of outdoor units connected in parallel fails, the four-way switching valve is reliably synchronized.
  • the purpose is to provide an air conditioning system capable of backup operation.
  • an air conditioning system includes a single refrigeration cycle configured by connecting refrigerant circuits on an indoor unit side and an outdoor unit side by a refrigerant liquid pipe and a refrigerant gas pipe, at least one compressor, A four-way switching valve and an outdoor heat exchanger for switching the refrigeration cycle to either a cooling or heating cycle, and a plurality of the outdoor units connected in parallel to the refrigeration cycle, and the plurality of outdoor units
  • a backup operation control unit configured to continue the air conditioning operation by performing a backup operation of another normal outdoor unit when the compressor of a certain outdoor unit breaks down, the backup operation control unit comprising: In the backup operation, when the four-way switching valve is operated by switching from the cooling cycle position to the heating cycle position, The four-way switching valve of the unit is once operated in the cooling cycle position, the low-pressure pressure of the failed outdoor unit is lowered, the operating differential pressure of the four-way switching valve of the failed outdoor unit is secured, and
  • the air conditioning system when a compressor of a certain outdoor unit among a plurality of outdoor units breaks down, the air conditioning system includes a backup operation control unit that continues the air conditioning operation by performing a backup operation of another normal outdoor unit.
  • the backup operation control unit during the backup operation, when the four-way switching valve is switched from the cooling cycle position to the heating cycle position, the four-way switching valve of the normal outdoor unit is once operated as the cooling cycle position, resulting in a failure.
  • Reduce the low pressure of the outdoor unit secure the differential pressure of the four-way switching valve of the failed outdoor unit, switch the four-way switching valve to the heating cycle position, and then switch the four-way switching valve of the normal outdoor unit to the heating cycle position.
  • the four-way selector valve synchronization control unit is operated to synchronize the four-way selector valve and operate in the heating cycle, backup operation
  • the four-way switching valve of the malfunctioning outdoor unit is switched from the cooling cycle position to the heating cycle position to ensure a working differential pressure.
  • Backup operation can be performed in synchronization with the cycle position. Therefore, the failure outdoor unit that occurs when the four-way switching valve of the failed outdoor unit cannot ensure the operation differential pressure necessary for switching from the cooling cycle position to the heating cycle position, and the four-way switching valve cannot be switched synchronously to the heating cycle position. This eliminates problems such as the application of high-pressure refrigerant gas to the low-pressure path and the total stop of the air-conditioning system, and the normal outdoor unit can be reliably operated for backup operation.
  • the four-way switching valve synchronization control unit is configured such that when the rotational speed of the compressor on the normal outdoor unit side reaches a predetermined rotational speed, The four-way switching valve is configured to output a switching command to the heating cycle position.
  • the four-way switching valve synchronization control unit outputs a switching command to the heating cycle position to the four-way switching valve of the failed outdoor unit when the compressor rotation speed on the normal outdoor unit side reaches a predetermined rotation speed. Because it is configured, it is necessary to switch the four-way selector valve to the heating cycle position because the low pressure of the failed outdoor unit decreases due to the compressor rotation speed on the normal outdoor unit side reaching the predetermined rotation speed Assuming that a sufficient differential pressure is secured, a switching command is output, and the four-way switching valve of the failed outdoor unit can be switched to the heating cycle position. Therefore, without making a hardware change to the current system, only the software change is required, and during backup operation, the four-way selector valve of the failed outdoor unit is reliably switched from the cooling cycle position to the heating cycle position and synchronized. Can be backed up.
  • the air conditioning system of the present invention is the above air conditioning system, wherein the four-way switching valve synchronization control unit is configured such that when the detected value of the low pressure on the failure outdoor unit side falls below a predetermined value, the failure outdoor unit The four-way switching valve is configured to output a switching command to the heating cycle position.
  • the four-way switching valve synchronization control unit outputs a switching command to the heating cycle position to the four-way switching valve of the failed outdoor unit when the detected value of the low pressure on the failed outdoor unit side falls below a predetermined value. Therefore, when the detected value of the low-pressure pressure on the failure outdoor unit side falls below a predetermined value, the low pressure on the failure outdoor unit decreases, and the four-way selector valve is switched to the heating cycle position. Assuming that the necessary differential pressure is secured, a switching command is output, and the four-way switching valve of the failed outdoor unit can be switched to the heating cycle position. Therefore, without making a hardware change to the current system, only the software change is required, and during backup operation, the four-way selector valve of the failed outdoor unit is reliably switched from the cooling cycle position to the heating cycle position and synchronized. Can be backed up.
  • the air conditioning system of the present invention is the above air conditioning system, wherein the four-way switching valve synchronization control unit is configured such that when the difference between the detected values of the high pressure and low pressure on the failed outdoor unit side is a predetermined value or more, A switching command to the heating cycle position is output to the four-way switching valve of the failed outdoor unit.
  • the four-way switching valve synchronization control unit moves the four-way switching valve of the failed outdoor unit to the heating cycle position. Since the difference between the detected values of the high pressure and low pressure on the failed outdoor unit side is equal to or greater than a predetermined value, the low pressure of the failed outdoor unit is reduced. Assuming that the differential pressure necessary to switch the four-way switching valve to the heating cycle position is secured, a switching command is output, and the four-way switching valve of the failed outdoor unit can be switched to the heating cycle position. Therefore, without making a hardware change to the current system, only the software change is required, and during backup operation, the four-way selector valve of the failed outdoor unit is reliably switched from the cooling cycle position to the heating cycle position and synchronized. Can be backed up.
  • the low-pressure paths between the four-way switching valves of the plurality of outdoor units and the compressor are connected to each other via low-pressure communication pipes. It is characterized by that.
  • the four-way switching valves of the failed outdoor unit are cooled during the backup operation.
  • the low pressure pressure should be quickly reduced via the low pressure communication pipe Can do. Therefore, the reliability and certainty at the time of switching of the four-way switching valve can be improved, and the time required for switching can be shortened.
  • the air conditioning system of the present invention is characterized in that, in the above air conditioning system, the low pressure communication pipe is an oil equalizing pipe or a pressure equalizing pipe connecting the low pressure paths of the compressors of the plurality of outdoor units.
  • the low-pressure communication pipes are oil equalizing pipes or pressure equalizing pipes connecting the low-pressure paths of the compressors of the plurality of outdoor units
  • a plurality of units are used in an air conditioning system including a plurality of outdoor units.
  • the outdoor unit compressors or their low-pressure paths are connected by an oil equalizing pipe or a pressure equalizing pipe.
  • the oil equalizing pipe or the pressure equalizing pipe is also used as a low-pressure communication pipe.
  • the low-pressure pressure on the failed outdoor unit side can be reduced via the oil equalizing pipe or the pressure equalizing pipe, and the four-way switching valve of the failed outdoor unit can be switched to the heating cycle position for synchronization. Therefore, the existing oil equalizing pipe or pressure equalizing pipe can be used, and the four-way switching valve of the failed outdoor unit can be switched synchronously reliably without cost increase.
  • an air conditioning system includes a single refrigeration cycle configured by connecting refrigerant circuits on an indoor unit side and an outdoor unit side with a refrigerant liquid pipe and a refrigerant gas pipe, at least one compressor, A four-way switching valve and an outdoor heat exchanger for switching the refrigeration cycle to either a cooling or heating cycle, and a plurality of the outdoor units connected in parallel to the refrigeration cycle, and the plurality of outdoor units
  • a backup operation control unit configured to continue the air-conditioning operation by performing a backup operation of another normal outdoor unit when the compressor of a certain outdoor unit breaks down, the plurality of outdoor units
  • the discharge pipe between the compressor and the four-way switching valve is provided with a high-pressure bypass circuit including an electromagnetic valve that connects the discharge pipes to each other, In the backup operation control unit, during the backup operation, when the four-way switching valve is operated by switching from the cooling cycle position to the heating cycle position, the electromagnetic valve provided in the high-pressure bypass circuit is opened, and the failure outdoor unit The four-way switching valve is switched to the heating
  • the air conditioning system when a compressor of a certain outdoor unit among a plurality of outdoor units breaks down, the air conditioning system includes a backup operation control unit that continues the air conditioning operation by performing a backup operation of another normal outdoor unit.
  • the discharge pipe between the compressors of the plurality of outdoor units and the four-way switching valve is provided with a high-pressure bypass circuit having an electromagnetic valve for connecting the discharge pipes to each other, and the backup operation control unit has a backup operation.
  • the four-way switch Since the four-way switching valve synchronization control unit is operated to synchronize with each other and operate in the heating cycle, the four-way switch is used during backup operation When switching the valve from the cooling cycle position to the heating cycle position, the high-pressure refrigerant gas discharged from the normal outdoor unit is applied to the discharge pipe of the failed outdoor unit, and the four-way selector valve of the failed outdoor unit is operated reliably. It is possible to switch from the cooling cycle position to the heating cycle position while ensuring the differential pressure, and to perform the backup operation in synchronization with the heating cycle position.
  • the failure outdoor unit that occurs when the four-way switching valve of the failed outdoor unit cannot ensure the operation differential pressure necessary for switching from the cooling cycle position to the heating cycle position, and the four-way switching valve cannot be switched synchronously to the heating cycle position.
  • the four-way switching valve of the failed outdoor unit ensures the operation differential pressure to ensure the cooling cycle position. Because it is possible to switch to the heating cycle position and perform backup operation in synchronization with the heating cycle position, the operating differential pressure required for switching the failed outdoor unit's four-way switching valve from the cooling cycle position to the heating cycle position cannot be secured. This eliminates problems such as the application of high-pressure refrigerant gas to the low-pressure path of the failed outdoor unit and the total shutdown of the air-conditioning system caused by the fact that the four-way switching valve cannot be switched synchronously to the heating cycle position. Can be backed up.
  • FIG. 5 is a refrigerant circuit diagram when the four-way switching valve of the failed outdoor unit cannot be switched synchronously to the heating cycle position when performing backup operation of the system.
  • FIG. 4 is a refrigerant circuit diagram in a state in which the four-way switching valve on the failed outdoor unit side is synchronously switched to the heating cycle position when performing backup operation of the air conditioning system.
  • FIG. 6 is a refrigerant circuit diagram after the four-way switching valve on the failed outdoor unit side has been normally synchronously switched from the state of FIG. 5. It is a flowchart figure which shows an example of switching control of the four-way switching valve at the time of backup operation of the said air conditioning system. It is a flowchart figure which shows the other example of switching control of the four-way switching valve at the time of backup operation of the said air conditioning system. It is a refrigerant circuit figure of the air-conditioning system concerning a 2nd embodiment of the present invention.
  • FIG. 1 shows a refrigerant circuit diagram in a state where the air conditioning system according to the present embodiment is operated in a cooling cycle.
  • FIG. 2 is a configuration diagram of a four-way switching valve incorporated in the refrigerant circuit. Shows a refrigerant circuit diagram of the system operating in a heating cycle.
  • the air conditioning system 1 of the present embodiment connects a plurality of outdoor units 2A and 2B and a plurality of indoor units 3A and 3B in parallel with each other via a so-called transition refrigerant liquid pipe 4 and refrigerant gas pipe 5. And it is set as the system which comprised one refrigerating cycle 6.
  • FIG. 1 shows a refrigerant circuit diagram in a state where the air conditioning system according to the present embodiment is operated in a cooling cycle.
  • FIG. 2 is a configuration diagram of a four-way switching valve incorporated in the refrigerant circuit. Shows a refrigerant circuit diagram of the system operating in a heating cycle.
  • the plurality of outdoor units 2A and 2B include a compressor 10, an oil separator 11, a check valve 12, a four-way switching valve 13, an outdoor heat exchanger 14, a heating expansion valve (EEVH) 15, a receiver 16, and a liquid side operation.
  • the outdoor refrigerant circuit 21 is configured by connecting the valve 17, the gas side operation valve 18, the accumulator 19 and the like through a refrigerant pipe 20 in a known manner, and an electromagnetic wave is provided between the compressor 10 and the oil separator 11.
  • An oil return circuit 24 including a valve 22 and a cupilary tube 23 is connected, and is connected in parallel to the refrigeration cycle 6 via the refrigerant liquid pipes 4A and 4B and the refrigerant gas pipes 5A and 5B. Yes.
  • a high pressure sensor 25 is provided in the refrigerant discharge pipe 20 ⁇ / b> A from the compressor 10 to the four-way switching valve 13 in the outdoor refrigerant circuit 21, and a low pressure pressure is provided in the refrigerant suction pipe 20 ⁇ / b> B from the four-way switching valve 13 to the compressor 10.
  • a sensor 26 is provided. Further, between the compressors 10 of the outdoor units 2A and 2B, an oil equalizing pipe 27 for equalizing the oil level of the oil filled in each compressor 10 is connected via an operation valve 28. .
  • the oil equalizing pipe 27 or a pressure equalizing pipe provided in parallel therewith connects the low pressure paths (refrigerant suction pipes 20B) between the four-way switching valves 13 and the compressors 10 of the plurality of outdoor units 2A and 2B to each other. It has a function as a low-pressure communication pipe that equalizes the low pressure of the path.
  • the compressor 10 here is a low-pressure housing type compressor in which the inside of the housing has a low-pressure refrigerant atmosphere. Further, the four-way switching valve 13 incorporated in the outdoor refrigerant circuit 21 of each of the outdoor units 2A and 2B is for switching the refrigeration cycle 6 between the cooling cycle shown in FIG. 1 and the heating cycle shown in FIG. Yes, it has the following configuration.
  • the four-way switching valve 13 includes a valve main body 30, and is provided with a high-pressure port 31 connected to the refrigerant discharge pipe 20 ⁇ / b> A from the compressor 10 on one side wall surface of the valve main body 30.
  • a first port 33 and a second port 34 to which the refrigerant gas pipe 20D connected to the heat exchanger 14 is connected are provided. Further, in the internal flow path 35 of the valve main body 30, on the valve seat portion on the other side wall surface.
  • the slide valve body 36 that is in sliding contact is built in.
  • the slide valve body 36 is provided with a switching channel 37 for communicating the low pressure port 32 with either the first port 33 or the second port 34 on the sliding contact surface side, and a pair of pistons 38 at both ends. 39 are coupled to each other, and a pair of left and right first pilot chambers 40 and second pilot chambers 41 defined by the pistons 38 and 39 from the internal flow path 35 are formed. Note that the refrigerant gas slightly leaks between the internal flow path 35 in the valve body 30 and the first pilot chamber 40 and the second pilot chamber 41 due to a minute gap between the valve body 30 and the pistons 38 and 39. It is like that.
  • the four-way switching valve 13 is provided with a pilot valve 42 for switching the communication state between the first pilot chamber 40 and the second pilot chamber 41 and the low pressure port 32, and the pressure difference between the high pressure and the low pressure is controlled by the first pilot chamber.
  • Chamber 40 and second pilot chamber 41 and by sliding the slide valve body 36 together with the pistons 38 and 39 in the valve body 30 by the pressure difference, the high pressure port 31, the low pressure port 32, the first port 33 and The communication state with the second port 34 can be switched.
  • the pilot valve 42 includes a valve main body 43, an electromagnetic coil 44 installed on one end side of the valve main body 43, a plunger 45 that is attracted by exciting the electromagnetic coil 44, and the electromagnetic coil 44 in a non-excited state.
  • a spring 46 that pushes out the plunger 45 and a valve body 47 that switches one of the first pilot chamber 40 and the second pilot chamber 41 to the low-pressure port 32 in response to the operation of the plunger 45 are provided. Yes.
  • the plurality of indoor units 3A and 3B have an indoor side refrigerant circuit 52 including an indoor heat exchanger 50 and a cooling expansion valve (EEVC) 51, and include refrigerant liquid pipes 4A and 4B and refrigerant gas pipes 5A, It is connected in parallel to the refrigeration cycle 6 via 5B.
  • EEVC cooling expansion valve
  • the four-way switching valve 13 When the air conditioning system 1 is operated in a cooling cycle, the four-way switching valve 13 is not energized with the pilot valve 42 and the electromagnetic coil 44 is not excited. Therefore, as shown in FIG.
  • the valve body 47 When the valve body 47 is pushed out, the first pilot chamber 40 is in communication with the low pressure port 32. Therefore, when the compressor 10 is driven and a high pressure is applied to the internal flow path 35 from the refrigerant discharge pipe 20 ⁇ / b> A via the high pressure port 31, the slide valve body is caused by the high / low pressure difference between the first pilot chamber 40 and the internal flow path 35. 36 is in the cooling cycle position shown in FIG. 2, and the high pressure port 31 and the second port 34, and the low pressure port 32 and the first port 33 are in communication with each other.
  • the refrigerant discharged from the compressor 10 to the refrigerant discharge pipe 20A is, as shown by solid line arrows in FIG. 1, the oil separator 11, the check valve 12, the four-way switching valve 13, the outdoor heat exchanger 14, and the heating Expansion valve (EEVH) 15, receiver 16, liquid side operation valve 17, refrigerant liquid pipes 4, 4A, 4B, cooling expansion valve (EEVC) 51, indoor heat exchanger 50, refrigerant gas pipes 5, 5A, 5B, gas It circulates in the cooling cycle returning to the compressor 10 through the side operation valve 18, the four-way switching valve 13, the refrigerant suction pipe 20 ⁇ / b> B and the accumulator 19.
  • EEVH Heating Expansion valve
  • EEVC cooling expansion valve
  • the refrigerant condensed and liquefied by the outdoor heat exchanger 14 is adiabatically expanded by the cooling expansion valve (EEVC) 51 and absorbs heat from the air heat exchanged by the indoor heat exchanger 50 to be evaporated and gasified. Used for indoor cooling.
  • the thick line portion in the refrigeration cycle 6 shown in FIG. 1 indicates the high pressure side, and the thin line portion indicates the low pressure side.
  • the four-way switching valve 13 is energized to the pilot valve 42 and the electromagnetic coil 44 is excited, so that the plunger 45 and the valve body 47 resist the spring 46.
  • the second pilot chamber 41 is in communication with the low pressure port 32 by being attracted to the electromagnetic coil 44 side. Therefore, when the compressor 10 is driven and a high pressure is applied to the internal flow path 35 from the refrigerant discharge pipe 20 ⁇ / b> A via the high pressure port 31, the slide valve body is caused by the high / low pressure difference between the second pilot chamber 41 and the internal flow path 35. 36 slides and moves from the left side position shown in FIG. 2 to the right side position to be in the heating cycle position, and the high pressure port 31 and the first port 33 and the low pressure port 32 and the second port 34 are in communication with each other. .
  • the refrigerant discharged from the compressor 10 to the refrigerant discharge pipe 20A by the switching of the four-way switching valve 13 to the heating cycle position is the oil separator 11, the check valve 12, and the four-way switching valve as shown by solid line arrows in FIG. 13, gas side operation valve 18, refrigerant gas pipes 5, 5A, 5B, indoor heat exchanger 50, cooling expansion valve (EEVC) 51, refrigerant liquid pipes 4, 4A, 4B, refrigerant liquid pipes 4, 4A, 4B, It circulates in the heating cycle which returns to the compressor 10 through the receiver 16, the heating expansion valve (EEVH) 15, the outdoor heat exchanger 14, the four-way switching valve 13, the refrigerant suction pipe 20B, and the accumulator 19.
  • EEVC cooling expansion valve
  • the refrigerant condensed and liquefied by radiating heat to the air heat-exchanged by the indoor heat exchanger 50 is adiabatically expanded by the heating expansion valve (EEVH) 15 and evaporated by the outdoor heat exchanger 14. Therefore, it is used for indoor heating.
  • the thick line part in the refrigerating cycle 6 shown in FIG. 3 is a high voltage
  • the outdoor controllers 60A and 60B and the indoor controller correspond to the operation command from the remote controller or the like, and the rotation speed of the compressor 10, the four-way switching valve 13 Switching, the opening degree of the cooling expansion valve (EEVC) 51 and the heating expansion valve (EEVH) 15, the rotational speeds of indoor fans and outdoor fans (not shown), and the like are appropriately controlled. .
  • the outdoor controllers 60A and 60B not only control the number of operating units of the plurality of outdoor units 2A and 2B according to the air conditioning load, but also the compressor 10 of any of the outdoor units 2A and 2B breaks down.
  • the backup operation control units 61A and 61B that operate the normal outdoor units 2A and 2B and continue the air conditioning operation are provided.
  • the backup operation control units 61A and 61B include the four-way switching valve 13 of the malfunctioning outdoor units 2A and 2B when the four-way switching valve 13 is switched from the cooling cycle position to the heating cycle position during the backup operation.
  • the four-way switching valve synchronization control units 62A and 62B for switching to the heating cycle position in a reliable manner.
  • the normal four-way switching valve 13 of the outdoor unit 2A is once set as the cooling cycle position.
  • the normal four-way switching valve 13 of the outdoor unit 2A is once set as the cooling cycle position.
  • the failure outdoor unit 2B since the compressor 10 has failed, a predetermined value required when switching the four-way switching valve 13 from the cooling cycle position to the heating cycle position (the product specification of the four-way switching valve 13 may be different).
  • the failure outdoor unit 2B is not possible.
  • the four-way switching valve 13 cannot be switched to the heating cycle position synchronously, and as shown in FIG. 4, as shown in FIG. 4, the refrigerant flows into the low-pressure suction path from the four-way switching valve 13 of the malfunctioning outdoor unit 2 B to the compressor 10.
  • the four-way switching valve synchronization control units 62A and 62B are for solving this problem.
  • FIG. 6 shows a state in which the four-way switching valve 13 of the failed outdoor unit 2B is synchronized with the same heating cycle position as that of the normal four-way switching valve 13 of the outdoor unit 2A. Is the heating cycle position, it is possible to prevent the high-pressure refrigerant gas from being applied to the low-pressure suction path (refrigerant suction pipe 20B) from the four-way switching valve 13 to the compressor 10.
  • FIGS. 7 and 8 are flowcharts showing the control functions of the above-described four-way switching valve synchronization control units 62A and 62B.
  • an operable unit (outdoor A control function for synchronously switching the four-way switching valve 13 of the failed outdoor unit 2B from the cooling cycle position to the heating cycle position by the operation of the unit 2A) will be specifically described with reference to FIGS.
  • FIG. 7 is a flowchart for the cases (2) and (3).
  • the process proceeds to step S2 and normal operation is possible.
  • a heating operation command by backup operation is output to the outdoor unit 2A.
  • the normal outdoor unit 2A is first operated with the four-way switching valve 13 in the cooling cycle position in which the high pressure port 31 and the second port 34 and the low pressure port 32 and the first port 33 are communicated.
  • step S4 the process proceeds to step S4, where, as in (2) or (3) above, whether the detected value by the low pressure sensor 26 is equal to or less than a predetermined value, or the detected values of the high pressure sensor 25 and the low pressure sensor 26. It is determined whether or not the difference (high pressure-low pressure) is equal to or greater than a predetermined value. If YES is determined, the process proceeds to step S5, and a switching command is output to the four-way switching valve 13 of the failed outdoor unit 2B. Accordingly, the process proceeds to step S6, where the low-pressure pressure of the four-way switching valve 13 of the failed outdoor unit 2B is reduced, and an operating differential pressure for moving the slide valve body 36 from the cooling cycle position to the heating cycle position is secured as described above. Therefore, even when the compressor 10 is stopped, it can be switched to the heating cycle position.
  • step S7 a switching command is output with respect to the four-way selector valve 13 of the normal outdoor unit 2A currently operated as a cooling cycle position, and the normal outdoor unit 2A is switched to the heating cycle position in step S8. It operates by a heating cycle and can start backup heating operation as Step S9.
  • FIG. 8 shows a flowchart for the case (1).
  • step S14 steps other than determining whether the rotational speed of the compressor 10 of the normal outdoor unit 2A operating in the cooling cycle has reached a predetermined rotational speed, that is, steps S11 to S11.
  • Step S13 and steps S15 to S19 are the same as steps S1 to S3 and steps S5 to S9 described with reference to FIG.
  • the following operational effects are obtained.
  • the outdoor unit 2A or 2B in this case, the outdoor unit 2B
  • the backup operation control units 61A and 61B continue the air conditioning operation by operating the normal outdoor unit 2A.
  • the four-way switching valve 13 of the failed outdoor unit 2B is maintained as it is in the cooling cycle position or the heating cycle position.
  • the normal four-way switching valve 13 of the outdoor unit 2A may be set to the cooling cycle position or the heating cycle position, and the backup operation may be performed by synchronizing the positions of the four-way switching valves 13 of the outdoor units 2A and 2B.
  • the four-way switching valve 13 must be switched to the cooling cycle position or the heating cycle position during the backup operation, and in this case, the four-way switching valve 13 of the normal outdoor unit 2A ensures an operating differential pressure. Since it can be switched to the heating cycle position as usual, the four-way switching valve 13 of the failure outdoor unit 2B has a compressor 10 failure and ensures a high-low pressure difference (for example, 0.3 MPa) of a predetermined value or more. In some cases, the four-way switching valve 13 cannot be synchronized with the heating cycle position.
  • the four-way switching valve synchronization controllers 62A and 62B once operate the four-way switching valve 13 of the normal outdoor unit 2A as the cooling cycle position to reduce the low pressure of the normal outdoor unit 2A.
  • the failure outdoor unit 2B side By reducing the low pressure on the failure outdoor unit 2B side through the refrigerant gas pipe 5B, it is determined that a pressure difference of 3 MPa or more is secured in any of the above (1) to (3), and the failure outdoor By issuing a switching command to the heating cycle position to the four-way switching valve 13 of the unit 2B, switching the four-way switching valve 13 to the heating cycle position, and then switching the four-way switching valve 13 of the normal outdoor unit 2A to the heating cycle position.
  • the four-way switching valve 13 of each outdoor unit 2A, 2B can be synchronized with the heating cycle position.
  • the four-way switching valve 13 of the malfunctioning outdoor unit 2B cannot be ensured to have an operating differential pressure required for switching from the cooling cycle position to the heating cycle position, and the four-way switching valve 13 cannot be switched synchronously to the heating cycle position.
  • the problems such as the application of the high-pressure refrigerant gas to the low-pressure path of the failed outdoor unit 2B and the total stop of the air conditioning system can be solved, and the normal outdoor unit 2A can be reliably operated to execute the backup operation.
  • the low pressure paths (refrigerant suction pipes 20B) between the four-way switching valves 13 of the plurality of outdoor units 2A and 2B and the compressor 10 are connected to each other via low pressure communication pipes such as an oil equalizing pipe 27 or a pressure equalizing pipe.
  • low pressure communication pipes such as an oil equalizing pipe 27 or a pressure equalizing pipe.
  • a high-pressure bypass circuit 70 having an electromagnetic valve 71 is provided between the refrigerant discharge pipes 20A of the plurality of outdoor units 2A and 2B, and the electromagnetic valve 71 is switched in four directions, compared to the first embodiment described above.
  • the difference is that the valve synchronization control units 63A and 63B perform opening / closing control. Since other points are the same as those in the first embodiment, the description thereof will be omitted.
  • the high pressure bypass circuit 70 provided with the electromagnetic valve 71 between the refrigerant discharge pipes 20A of the plurality of outdoor units 2A, 2B via the operation valve 72 for pipe connection. Connected by. Then, a certain outdoor unit in the plurality of outdoor units 2A and 2B, for example, the compressor 10 of the outdoor unit 2B breaks down, and another normal outdoor unit such as the outdoor unit 2A is operated by the backup operation control units 61A and 61B.
  • the four-way switching valve synchronization controller 73A that opens the electromagnetic valve 71 of the high-pressure bypass circuit 70 is opened. , 73B.
  • two electromagnetic valves 71 are provided in the high pressure bypass circuit 70. This is because the plurality of outdoor units 2A and 2B have a common configuration. Of course, it is also possible to have a configuration in which one electromagnetic valve 71 is provided.
  • the high pressure is supplied via the four-way switching valve synchronization control units 73A and 73B.
  • the electromagnetic valve 71 of the bypass circuit 70 By opening the electromagnetic valve 71 of the bypass circuit 70, the high-pressure refrigerant gas discharged from the normal outdoor unit 2A is applied to the refrigerant discharge pipe 20A of the failed outdoor unit 2B, and the four-way switching valve 13 of the failed outdoor unit 2B is turned on.
  • a differential pressure (high / low pressure difference) necessary for switching from the cooling cycle position to the heating cycle position can be secured, and the four-way switching valve 13 can be switched to the heating cycle position and synchronized. Therefore, according to this embodiment, the same effect as that of the first embodiment can be expected.
  • this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably.
  • a backup operation is performed for the operable unit (for example, the outdoor unit 2A) to perform air conditioning operation.
  • the four-way switching valve 13 of the failed outdoor unit 2B is synchronously switched from the cooling cycle position to the heating cycle position, but the outdoor unit 2A during the backup operation is defrosted during the backup heating operation.
  • the four-way switching valve 13 In order to perform the operation or the oil return operation, the four-way switching valve 13 needs to be synchronously switched when the operation is switched to the cooling cycle, and when the operation is completed and the operation is returned to the backup heating operation. It goes without saying that the present invention can be similarly applied to such a case.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
PCT/JP2016/077763 2015-10-22 2016-09-21 空調システム WO2017068902A1 (ja)

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CN201680043745.3A CN107850352A (zh) 2015-10-22 2016-09-21 空调系统
ES16857220T ES2732660T3 (es) 2015-10-22 2016-09-21 Sistema de aire acondicionado
EP16857220.4A EP3315877B1 (de) 2015-10-22 2016-09-21 Klimatisierungssystem

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JP2015-207928 2015-10-22
JP2015207928A JP6552939B2 (ja) 2015-10-22 2015-10-22 空調システム

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WO2020255430A1 (ja) * 2019-06-17 2020-12-24 三菱電機株式会社 冷凍サイクル装置
WO2022059054A1 (ja) * 2020-09-15 2022-03-24 東芝キヤリア株式会社 冷凍サイクル装置
JP7571149B2 (ja) 2020-09-15 2024-10-22 日本キヤリア株式会社 冷凍サイクル装置

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CN108826580B (zh) * 2018-07-17 2019-10-22 珠海格力电器股份有限公司 负载替换方法、空调机组及其模块、模块控制器
CN110044009A (zh) * 2019-04-25 2019-07-23 宁波奥克斯电气股份有限公司 一种四通阀切换故障检测方法、装置及空调器
CN111623472B (zh) * 2020-05-09 2023-12-26 青岛海尔空调电子有限公司 一种空调器及其防止低压故障的方法

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JP7571149B2 (ja) 2020-09-15 2024-10-22 日本キヤリア株式会社 冷凍サイクル装置

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EP3315877A1 (de) 2018-05-02
CN107850352A (zh) 2018-03-27
ES2732660T3 (es) 2019-11-25
EP3315877B1 (de) 2019-06-05
EP3315877A4 (de) 2018-06-20
JP6552939B2 (ja) 2019-07-31

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