WO2017179117A1 - Climatiseur - Google Patents

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Publication number
WO2017179117A1
WO2017179117A1 PCT/JP2016/061771 JP2016061771W WO2017179117A1 WO 2017179117 A1 WO2017179117 A1 WO 2017179117A1 JP 2016061771 W JP2016061771 W JP 2016061771W WO 2017179117 A1 WO2017179117 A1 WO 2017179117A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
unit
flow rate
compressor
heat exchanger
Prior art date
Application number
PCT/JP2016/061771
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English (en)
Japanese (ja)
Inventor
一輝 大河内
Original Assignee
三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2016/061771 priority Critical patent/WO2017179117A1/fr
Publication of WO2017179117A1 publication Critical patent/WO2017179117A1/fr

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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
    • 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
    • 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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle

Definitions

  • This invention relates to the air conditioning apparatus which suppresses that a refrigerant
  • an air conditioner for example, a multi air conditioner for buildings in which a plurality of indoor units are connected to an outdoor unit is known.
  • the total length of refrigerant pipes connecting an outdoor unit and a plurality of indoor units may reach several hundred meters. For this reason, the air conditioner tends to have an extremely large amount of refrigerant filled in the refrigerant pipe. In this case, when the refrigerant leaks in the air conditioner, for example, a large amount of the refrigerant may flow out into one room.
  • Patent Document 1 discloses a flow blocking device that blocks the flow of the refrigerant and a refrigerant leakage detection device that detects the leakage of the refrigerant. The air conditioner provided with these is disclosed.
  • Patent Document 1 when refrigerant leakage is detected by the refrigerant leakage detection device, the electromagnetic expansion valve provided in the outdoor unit is closed, the refrigerant flowing in the indoor unit is collected in the outdoor unit, and then the flow blocking device is closed. And hold the refrigerant in the outdoor unit. Thereby, patent document 1 tries to suppress that a refrigerant
  • Patent Document 1 since the air conditioner disclosed in Patent Document 1 collects refrigerant in the outdoor unit, the amount of refrigerant collected is limited to the amount of refrigerant held in the outdoor unit. For this reason, the refrigerant may not be collected in the outdoor unit and may remain in the indoor unit. Thereby, a refrigerant
  • the present invention has been made to solve the above-described problems, and provides an air conditioner that suppresses leakage of refrigerant into a room.
  • a compressor, a first heat exchanger, an expansion unit, a second heat exchanger, and an accumulator are connected by a pipe, a refrigerant circuit through which a refrigerant flows, and a discharge side of the compressor
  • the branch pipe since the branch pipe communicates with the outside of the room, the refrigerant flowing through the branch pipe is discharged to the outside by opening the branch flow rate adjusting unit. Since the amount of the refrigerant discharged to the outside is unlimited, even if the refrigerant leaks in the refrigerant circuit, the refrigerant can be prevented from leaking into the room.
  • FIG. 1 is a circuit diagram showing an air conditioner 1 according to Embodiment 1 of the present invention.
  • the air conditioner 1 will be described with reference to FIG.
  • the air conditioner 1 includes, for example, one outdoor unit 2 and two indoor units 3a and 3b.
  • the outdoor unit 2 and the two indoor units 3a and 3b are: Each is connected by a refrigerant main pipe 8.
  • the air conditioner 1 is a building multi-air conditioner that performs air conditioning using, for example, a refrigeration cycle, and includes a cooling only operation mode in which both of the two indoor units 3a and 3b perform a cooling operation, and two air conditioning units.
  • All the outdoor units 2 are selected from the all-heating operation mode in which the heating operation is performed.
  • the case where there is one outdoor unit 2 is illustrated two or more outdoor units may be used.
  • two indoor units 3a and 3b one unit or three or more units may be used.
  • the outdoor unit 2 is installed outdoors, and includes a compressor 10, a flow path switching unit 11, a first heat exchanger 12, a blower 13, an accumulator 17, a sub flow rate adjustment unit 20, a branch flow rate adjustment unit 22, A leakage detection unit 30, a discharge temperature detection unit 33, and a control unit 40 are provided.
  • the two indoor units 3a and 3b include expansion units 14a and 14b, second heat exchangers 15a and 15b, indoor fans 16a and 16b, first heat exchange temperature detection units 34a and 34b, and second heat exchange, respectively. It has temperature detectors 35a and 35b and indoor temperature detectors 36a and 36b.
  • the compressor 10, the flow path switching unit 11, the first heat exchanger 12, the auxiliary flow rate adjustment unit 20, the expansion units 14 a and 14 b, the second heat exchangers 15 a and 15 b, and the accumulator 17 are connected by the pipe 5.
  • the refrigerant circuit 4 is configured.
  • the compressor 10 sucks refrigerant in a low-temperature and low-pressure state, compresses the sucked refrigerant, and discharges it as a refrigerant in a high-temperature and high-pressure state.
  • the compressor 10 is an inverter compressor whose capacity can be controlled, for example. Two compressors 10 may be provided.
  • the flow path switching unit 11 includes a refrigerant pipe 6 connected to the discharge side of the compressor 10, a refrigerant pipe 7 connected to the accumulator 17, a refrigerant pipe 7 connected to the first heat exchanger 12, and a second heat.
  • the refrigerant pipe 7 connected to the refrigerant main pipe 8 connected to the exchangers 15a and 15b is connected.
  • the flow path switching unit 11 switches the direction in which the refrigerant flows in the refrigerant circuit 4, and is, for example, a four-way valve.
  • the flow path switching unit 11 determines whether the refrigerant discharged from the compressor 10 flows to the first heat exchanger 12 (solid line in FIG. 1) or the second heat exchangers 15a and 15b (broken line in FIG. 1). Thus, both the cooling operation and the heating operation are performed.
  • the 1st heat exchanger 12 is connected to the refrigerant
  • the first heat exchanger 12 acts as a condenser during the cooling operation, and acts as an evaporator during the heating operation.
  • the blower 13 is a fan that is provided in the vicinity of the first heat exchanger 12 and blows outdoor air to the first heat exchanger 12.
  • the accumulator 17 is connected to the refrigerant pipe 7 on the suction side of the compressor 10, and the liquid refrigerant out of the refrigerant sucked into the compressor 10 is used so that only the gas refrigerant flows into the compressor 10. It is to be stored.
  • the expansion parts 14a and 14b are connected to the refrigerant main pipe 8 between the auxiliary flow rate adjustment part 20 and the second heat exchangers 15a and 15b, and are pressure reducing valves or expansion valves that expand by depressurizing the refrigerant.
  • the expansion portions 14a and 14b are electronic expansion valves whose opening degrees are adjusted, for example.
  • the second heat exchangers 15a and 15b are connected to the refrigerant main pipe 8 between the expansion parts 14a and 14b and the flow path switching part 11, and exchange heat between the indoor air and the refrigerant.
  • the second heat exchangers 15a and 15b act as evaporators during the cooling operation, and act as condensers during the heating operation.
  • the indoor blowers 16a and 16b are fans that are provided in the vicinity of the second heat exchangers 15a and 15b and blow indoor air to the second heat exchangers 15a and 15b.
  • the auxiliary flow rate adjusting unit 20 is provided in the refrigerant pipe 7 that connects the first heat exchanger 12 and the expansion units 14a and 14b, and adjusts the flow rate of the refrigerant.
  • the auxiliary flow rate adjusting unit 20 is an electromagnetic valve whose opening degree is adjusted by changing the opening area of a flow path (not shown) through which the refrigerant flows.
  • the auxiliary flow rate adjustment unit 20 may be an on-off valve that does not have an opening degree adjustment function, as long as it can block the flow of the refrigerant in the refrigerant circuit 4. Even if the auxiliary flow rate adjusting unit 20 is not provided in the outdoor unit 2, it may be provided in the refrigerant pipe 7 or the refrigerant main pipe 8 that connects the first heat exchanger 12 and the expansion units 14a and 14b. Good.
  • the branch flow rate adjusting unit 22 is connected to the refrigerant pipe 6 connected to the discharge side of the compressor 10, is provided in the branch pipe 21 that leads to the outdoors, and adjusts the flow rate of the refrigerant flowing through the branch pipe 21. That is, when the branch flow rate adjusting unit 22 is opened, the refrigerant flowing through the branch pipe 21 is discharged to the outdoor atmosphere and released.
  • the branch flow rate adjusting unit 22 is an electromagnetic valve whose opening degree is adjusted by changing the opening area of the flow path through which the refrigerant flows.
  • the branch flow rate adjusting unit 22 may be an on-off valve that does not have an opening degree adjusting function, as long as it can block the refrigerant flow in the branch pipe 21.
  • the leakage detection unit 30 detects that the refrigerant has leaked in the refrigerant circuit 4.
  • the leak detection unit 30 includes a discharge pressure detection unit 31 and a suction pressure detection unit 32.
  • the discharge pressure detection unit 31 is provided in the refrigerant pipe 6 that connects the discharge side of the compressor 10 and the flow path switching unit 11, and detects the pressure of the high-temperature and high-pressure refrigerant that is compressed and discharged by the compressor 10. It is to detect.
  • the suction pressure detection unit 32 is provided in the refrigerant pipe 7 that connects the accumulator 17 and the flow path switching unit 11, and detects the pressure of the low-temperature and low-pressure refrigerant sucked into the compressor 10. When the refrigerant leaks, the amount of the refrigerant flowing through the pipe 5 is reduced, which hinders the operations of the compressor 10 and the expansion portions 14a and 14b.
  • the discharge pressure of the refrigerant discharged from the compressor 10 decreases, and the suction pressure of the refrigerant sucked into the compressor 10 increases. That is, when the discharge pressure detected by the discharge pressure detector 31 is less than the discharge pressure threshold, it is determined that the refrigerant is leaking. Further, when the suction pressure detected by the suction pressure detection unit 32 is larger than the suction pressure threshold, it is determined that the refrigerant is leaking.
  • the discharge temperature detection unit 33 is provided in the refrigerant pipe 6 that connects the discharge side of the compressor 10 and the flow path switching unit 11, and determines the temperature of the high-temperature and high-pressure refrigerant that is compressed and discharged by the compressor 10. It is to detect.
  • the discharge temperature detection unit 33 is a thermistor, for example.
  • the first heat exchange temperature detectors 34a and 34b are provided in the refrigerant main pipe 8 connecting the expansion parts 14a and 14b and the second heat exchangers 15a and 15b, and the temperature of the refrigerant flowing through the refrigerant main pipe 8 is determined. It is to detect. In other words, the first heat exchange temperature detectors 34a and 34b detect the temperature of the refrigerant flowing into the second heat exchangers 15a and 15b during the cooling operation, and the second heat exchanger 15a during the heating operation. , 15b, the temperature of the refrigerant flowing out from 15b is detected.
  • the first heat exchange temperature detectors 34a and 34b are, for example, thermistors.
  • the second heat exchange temperature detectors 35a and 35b are provided in the refrigerant main pipe 8 connecting the second heat exchangers 15a and 15b and the flow path switching unit 11, and the temperature of the refrigerant flowing through the refrigerant main pipe 8 is determined. It is to detect. That is, the second heat exchange temperature detectors 35a and 35b detect the temperature of the refrigerant flowing out of the second heat exchangers 15a and 15b during the cooling operation, and the second heat exchanger 15a during the heating operation. , 15b is detected.
  • the second heat exchange temperature detectors 35a and 35b are, for example, thermistors.
  • the indoor temperature detectors 36a and 36b are provided in a suction part (not shown) where air is sucked in the second heat exchangers 15a and 15b, and the indoor air sucked into the second heat exchangers 15a and 15b. The temperature is detected.
  • the indoor temperature detectors 36a and 36b are, for example, thermistors.
  • the refrigerant flowing in the refrigerant circuit 4 may be a natural refrigerant such as carbon dioxide, hydrocarbon, or helium, or may be a refrigerant of R410A, R32, R407C, R404A, or HFO1234yf.
  • Control unit 40 The control unit 40 performs overall control of the air conditioner 1, and is, for example, a microcomputer and a driver.
  • the control unit 40 opens the branch flow rate adjustment unit 22.
  • the refrigerant flowing in the refrigerant circuit 4 passes through the branch pipe 21 and is discharged to the outdoor atmosphere.
  • the leakage detection unit 30 includes the discharge pressure detection unit 31 and the suction pressure detection unit 32.
  • the control unit 40 determines that the refrigerant is leaking and opens the branch flow rate adjustment unit 22.
  • the suction pressure detected by the suction pressure detection unit 32 is larger than the suction pressure threshold, the control unit 40 determines that the refrigerant is leaking and opens the branch flow rate adjustment unit 22.
  • the control unit 40 opens each branch flow rate adjusting unit 22 in the plurality of outdoor units 2.
  • the control unit 40 detects the leakage of the refrigerant based on the detection result of the discharge pressure detection unit 31 or the detection result of the suction pressure detection unit 32. However, the control unit 40 detects the leakage of the refrigerant installed indoors. A refrigerant leak may be detected based on a leak sensor (not shown) that detects the leak. The control unit 40 may detect refrigerant leakage based on detection results of sensors other than the discharge pressure detection unit 31 and the suction pressure detection unit 32.
  • the control unit 40 closes the auxiliary flow rate adjustment unit 20 when the leakage detection unit 30 detects that the refrigerant has leaked. As a result, the refrigerant flow is blocked in the refrigerant circuit 4.
  • the flow is interrupted by the auxiliary flow rate adjusting unit 20, and the refrigerant does not flow from the outdoor unit 2 to the indoor units 3a and 3b again. Therefore, the refrigerant flowing in the indoor units 3a and 3b is collected in the outdoor unit 2.
  • the control unit 40 has a function of switching the flow path switching unit 11 so that the discharge side of the compressor 10 and the first heat exchanger 12 are connected when the leakage detection unit 30 detects that the refrigerant has leaked. Have That is, the control unit 40 switches the refrigerant flow to the refrigerant flow during the cooling operation.
  • the auxiliary flow rate adjusting unit 20 is closed, after the refrigerant flowing through the indoor units 3a and 3b flows into the outdoor unit 2, the flow is blocked by the auxiliary flow rate adjusting unit 20, and the refrigerant flows from the outdoor unit 2 to the indoor again. It does not flow into the machines 3a and 3b. Therefore, the refrigerant flowing in the indoor units 3a and 3b is collected in the outdoor unit 2.
  • control part 40 maintains the flow of a refrigerant
  • the control unit 40 switches the refrigerant flow to the refrigerant flow during the cooling operation.
  • the control unit 40 has a function of operating the blower 13 at the maximum number of revolutions when the leakage detection unit 30 detects that the refrigerant has leaked. Thereby, in the 1st heat exchanger 12 which acts as a condenser, a refrigerant becomes easy to condense. Therefore, an increase in the discharge pressure of the refrigerant discharged from the compressor 10 can be suppressed.
  • the control unit 40 has a function of operating the compressor 10 at the frequency threshold when the leakage detection unit 30 detects that the refrigerant has leaked.
  • the frequency threshold is a frequency value between, for example, the minimum frequency and half of the maximum frequency. If the frequency threshold is too high, the pressure in the refrigeration cycle changes abruptly, which may cause an abnormal stop. Moreover, if the frequency threshold is too low, such as the minimum frequency, there is a possibility that the force for collecting the refrigerant from the indoor units 3a and 3b to the outdoor unit 2 is weakened. Therefore, the frequency threshold value is a frequency value between, for example, the minimum frequency and a half of the maximum frequency.
  • the control unit 40 has a function of closing the branch flow rate adjusting unit 22 when the discharge pressure detected by the discharge pressure detecting unit 31 is equal to or higher than the discharge pressure threshold.
  • the discharge pressure threshold is the maximum pressure allowed when the compressor 10 is operated or near the maximum pressure. Thereby, the quantity of the refrigerant
  • the control unit 40 determines that the refrigerant leakage has been eliminated and closes the branch flow rate adjustment unit 22.
  • control unit 40 has a function of closing the branch flow rate adjusting unit 22 when the suction pressure detected by the suction pressure detection unit 32 is equal to or lower than the suction pressure threshold.
  • the suction pressure threshold is the minimum pressure that is allowed during the operation of the compressor 10 or near the minimum pressure. Thereby, the quantity of the refrigerant
  • the control unit 40 determines that the refrigerant leakage has been eliminated and closes the branch flow rate adjustment unit 22.
  • the control unit 40 includes a discharge pressure detection unit 31, a suction pressure detection unit 32, a discharge temperature detection unit 33, first heat exchange temperature detection units 34a and 34b, second heat exchange temperature detection units 35a and 35b, and indoor temperature detection. Based on the detection results of the units 36a and 36b and the instruction from the remote controller (not shown), the frequency of the compressor 10, the rotational speed of the blower 13, the switching of the flow path switching unit 11, the opening of the expansion units 14a and 14b The opening degree of the auxiliary flow rate adjusting unit 20 and the opening degree of the branch flow rate adjusting unit 22 are controlled. Thereby, a cooling only operation mode or a heating only operation mode is implemented.
  • control unit 40 is obtained as a difference between the temperature detected by the first heat exchange temperature detectors 34a and 34b and the temperature detected by the second heat exchange temperature detectors 35a and 35b during the cooling operation.
  • the opening degree of the expansion portions 14a and 14b is controlled so that the superheat, that is, the degree of superheat becomes constant.
  • control unit 40 calculates the temperature of the saturated refrigerant liquid calculated from the discharge pressure detected by the discharge pressure detection unit 31 and the temperature detected by the first heat exchange temperature detection units 34a and 34b.
  • the degree of opening of the expansion portions 14a and 14b is controlled so that the subcooling obtained as the difference between them, that is, the degree of supercooling becomes constant.
  • the control unit 40 controls the opening of the auxiliary flow rate adjusting unit 20 so as not to adversely affect the operation state of the refrigeration cycle, for example, the cooling capacity, during the cooling operation.
  • the control unit 40 fully opens the opening of the auxiliary flow rate adjusting unit 20 during the cooling operation.
  • the control unit 40 controls the opening degree of the auxiliary flow rate adjusting unit 20 so as not to adversely affect the operation state of the refrigeration cycle, for example, the heating capacity, during the heating operation.
  • the control unit 40 fully opens the opening of the auxiliary flow rate adjusting unit 20 during the heating operation.
  • the control unit 40 opens the auxiliary flow rate adjusting unit 20 during the heating operation.
  • the control unit 40 controls the opening degree of the branch flow rate adjusting unit 22 so as not to adversely affect the operation state of the refrigeration cycle, for example, the cooling capacity, during the cooling operation. For example, the control unit 40 fully closes the opening of the branch flow rate adjusting unit 22 during the cooling operation.
  • the branch flow rate adjusting unit 22 is an on-off valve that keeps the opening degree constant
  • the control unit 40 closes the branch flow rate adjusting unit 22 during the cooling operation.
  • the control unit 40 controls the opening degree of the branch flow rate adjusting unit 22 so as not to adversely affect the operation state of the refrigeration cycle, for example, the heating capacity, during the heating operation.
  • the control unit 40 fully closes the opening of the branch flow rate adjusting unit 22 during the heating operation.
  • the branch flow rate adjustment part 22 is an on-off valve without an opening degree adjustment function
  • the control part 40 closes the branch flow rate adjustment part 22 at the time of heating operation.
  • the air conditioner 1 has a cooling only operation mode and a heating only operation mode as operation modes.
  • the cooling only operation includes the compressor 10, the flow path switching unit 11, the first heat exchanger 12, the auxiliary flow rate adjusting unit 20, the respective expansion units 14a and 14b, the respective second heat exchangers 15a and 15b, the flow
  • the refrigerant flows in the order of the path switching unit 11 and the accumulator 17, and the indoor air is heat-exchanged with the refrigerant in each of the second heat exchangers 15a and 15b, whereby each room is cooled.
  • the all-heating operation includes the compressor 10, the flow path switching unit 11, the second heat exchangers 15a and 15b, the expansion units 14a and 14b, the auxiliary flow rate adjusting unit 20, the first heat exchanger 12,
  • the refrigerant flows in the order of the path switching unit 11 and the accumulator 17, and the indoor air is heat-exchanged with the refrigerant in the second heat exchangers 15a and 15b, whereby each room is heated.
  • FIG. 2 is a circuit diagram illustrating a state during the cooling only operation of the air-conditioning apparatus 1 according to Embodiment 1 of the present invention. Next, the operation
  • the cooling only operation will be described. In the cooling only operation, the discharge side of the compressor 10 and the first heat exchanger 12 are connected by the flow path switching unit 11, the auxiliary flow rate adjustment unit 20 is opened, and the branch flow rate adjustment unit 22 is closed. As indicated by solid line arrows in FIG. 2, in the cooling only operation, the refrigerant sucked into the compressor 10 is compressed by the compressor 10 and discharged in a high-temperature and high-pressure gas state.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 passes through the flow path switching unit 11 and flows into the first heat exchanger 12 that acts as a condenser, and in the first heat exchanger 12 Then, heat is exchanged with the outdoor air blown by the blower 13 to be condensed and liquefied.
  • the condensed refrigerant in the liquid state passes through the auxiliary flow rate adjusting unit 20 and flows into the indoor units 3a and 3b.
  • the refrigerant flows into the respective expansion portions 14a and 14b, and is expanded and depressurized in the respective expansion portions 14a and 14b to become a low-temperature and low-pressure gas-liquid two-phase refrigerant.
  • the gas-liquid two-phase refrigerant flows into the second heat exchangers 15a and 15b acting as evaporators, and in each of the second heat exchangers 15a and 15b, the indoor fans 16a and 16b. Heat is exchanged with the blown room air to evaporate. At this time, the room air is cooled and cooling is performed in each room.
  • the evaporated low-temperature and low-pressure gaseous refrigerant passes through the flow path switching unit 11 and flows into the accumulator 17.
  • the liquid refrigerant is stored in the accumulator 17, and the gas refrigerant is sucked into the compressor 10.
  • FIG. 3 is a circuit diagram showing a state during the heating only operation of the air-conditioning apparatus 1 according to Embodiment 1 of the present invention.
  • the all heating operation will be described.
  • the accumulator 17 and the second heat exchangers 15a and 15b are connected by the flow path switching unit 11, the sub flow rate adjusting unit 20 is opened, and the branch flow rate adjusting unit 22 is closed.
  • the refrigerant sucked into the compressor 10 is compressed by the compressor 10 and discharged in a high-temperature and high-pressure gas state.
  • the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 passes through the flow path switching unit 11 and flows into the indoor units 3a and 3b.
  • the refrigerant flows into the respective second heat exchangers 15a, 15b acting as condensers, and in each of the second heat exchangers 15a, 15b, air is blown by the indoor fans 16a, 16b. Heat is exchanged with the indoor air thus generated, and it is condensed and liquefied. At this time, indoor air is warmed and heating is performed in each room.
  • the condensed liquid refrigerant is expanded and depressurized in the respective expansion portions 14a and 14b to become a low-temperature and low-pressure gas-liquid two-phase refrigerant. Then, the refrigerant in the gas-liquid two-phase state passes through the auxiliary flow rate adjusting unit 20 and flows into the first heat exchanger 12 acting as an evaporator, and in the first heat exchanger 12, the air is blown by the blower 13. Heat is exchanged with the outdoor air thus produced, and it is evaporated and gasified. The evaporated low-temperature and low-pressure gaseous refrigerant passes through the flow path switching unit 11 and flows into the accumulator 17. Of the refrigerant flowing into the accumulator 17, the liquid refrigerant is stored in the accumulator 17, and the gas refrigerant is sucked into the compressor 10.
  • FIG. 4 is a flowchart showing the operation of the air-conditioning apparatus 1 according to Embodiment 1 of the present invention.
  • coolant leaks is demonstrated.
  • the leakage detection unit 30 If no refrigerant leakage is detected (No in step ST1), the control ends.
  • a refrigerant collecting operation for collecting the refrigerant flowing in the indoor units 3a and 3b in the outdoor unit 2 is performed (step ST2).
  • step ST3 the leakage reduction operation
  • the refrigerant collecting operation and the leakage reducing operation during the cooling only operation will be described with reference to FIG. 5, and the refrigerant collecting operation and the leakage reducing operation during the heating only operation will be described with reference to FIG.
  • FIG. 5 is a flowchart showing an operation during the cooling only operation of the air-conditioning apparatus 1 according to Embodiment 1 of the present invention.
  • the operation of the air conditioner 1 when the refrigerant leaks during the cooling only operation will be described.
  • the refrigerant collecting operation starts.
  • the flow path switching unit 11 is maintained without being switched (step ST11).
  • the frequency of the compressor 10 is changed to a frequency threshold value (step ST12).
  • the auxiliary flow rate adjusting unit 20 is closed (step ST13).
  • step ST13 the refrigerant collecting operation ends, and then the leakage reduction operation starts.
  • the branch flow rate adjusting unit 22 is opened (step ST14). As a result, the refrigerant flowing in the refrigerant circuit 4 passes through the branch pipe 21 and is discharged to the outdoor atmosphere.
  • the rotation speed of the blower 13 is changed to the maximum rotation speed (step ST15). Then, it is determined whether or not the discharge pressure detected by the discharge pressure detection unit 31 is equal to or higher than the discharge pressure threshold value, or whether or not the suction pressure detected by the suction pressure detection unit 32 is equal to or lower than the suction pressure threshold value. (Step ST16). When the discharge pressure is less than the discharge pressure threshold and the suction pressure is greater than the suction pressure threshold (No in step ST16), the process returns to step ST16.
  • step ST16 when the discharge pressure is equal to or higher than the discharge pressure threshold value or the suction pressure is equal to or lower than the suction pressure threshold value (Yes in step ST16), the control ends. Thereby, the leakage reduction operation ends. Note that the steps ST11 to ST15 are in no particular order.
  • FIG. 6 is a flowchart showing an operation during the heating operation of the air-conditioning apparatus 1 according to Embodiment 1 of the present invention.
  • coolant leaks at the time of all heating operation is demonstrated.
  • the refrigerant collecting operation starts.
  • the flow path switching unit 11 is switched (step ST21).
  • the frequency of the compressor 10 is changed to a frequency threshold value (step ST22).
  • the auxiliary flow rate adjusting unit 20 is closed (step ST23).
  • step ST23 the refrigerant collecting operation ends, and then the leakage reduction operation starts.
  • the branch flow rate adjusting unit 22 is opened (step ST24). As a result, the refrigerant flowing in the refrigerant circuit 4 passes through the branch pipe 21 and is discharged to the outdoor atmosphere.
  • the rotation speed of the blower 13 is changed to the maximum rotation speed (step ST25). Then, it is determined whether or not the discharge pressure detected by the discharge pressure detection unit 31 is equal to or higher than the discharge pressure threshold value, or whether or not the suction pressure detected by the suction pressure detection unit 32 is equal to or lower than the suction pressure threshold value. (Step ST26). When the discharge pressure is less than the discharge pressure threshold and the suction pressure is greater than the suction pressure threshold (No in step ST26), the process returns to step ST26.
  • step ST26 when the discharge pressure is not less than the discharge pressure threshold value or the suction pressure is not more than the suction pressure threshold value (Yes in step ST26), the control ends. Thereby, the leakage reduction operation ends. Note that the steps ST21 to ST25 are in no particular order.
  • the branch pipe 21 in which the flow rate of the refrigerant is adjusted by the branch flow rate adjusting unit 22 communicates with the outdoors. For this reason, the refrigerant
  • the amount of refrigerant discharged to the outside is unlimited, so that when the refrigerant leaks in the refrigerant circuit 4, the refrigerant can be collected without limitation. Thereby, even if the refrigerant has flammability, safety can be ensured.
  • the amount of refrigerant discharged to the outside is unlimited, so that when the refrigerant leaks in the refrigerant circuit 4, the refrigerant can be collected without limitation. Therefore, the amount of refrigerant leakage can be reduced.
  • a leakage detection unit 30 that detects that the refrigerant has leaked, and a control unit 40 that opens the branch flow rate adjustment unit 22 when the leakage detection unit 30 detects that the refrigerant has leaked are further included. Thereby, the refrigerant
  • the refrigerant circuit 4 is provided in the refrigerant pipe 7 that connects the first heat exchanger 12 and the expansion portions 14a and 14b, and further includes a sub flow rate adjusting unit 20 that adjusts the flow rate of the refrigerant.
  • the sub flow rate adjustment unit 20 is closed. As a result, the refrigerant flow is blocked in the refrigerant circuit 4.
  • the flow is interrupted by the auxiliary flow rate adjusting unit 20, and the refrigerant does not flow from the outdoor unit 2 to the indoor units 3a and 3b again. Therefore, the refrigerant flowing in the indoor units 3a and 3b is collected in the outdoor unit 2.
  • the amount of refrigerant that is released to the atmosphere increases by performing the refrigerant collecting operation. For this reason, the quantity of the refrigerant
  • the sub-flow rate adjusting unit 20 adjusts the opening degree by changing the opening area of the flow path through which the refrigerant flows. Thereby, the auxiliary
  • the refrigerant circuit 4 further includes a flow path switching unit 11 that switches connection between the compressor 10, the first heat exchanger 12, and the second heat exchangers 15a and 15b and switches a direction in which the refrigerant flows.
  • 40 has a function of switching the flow path switching unit 11 so that the discharge side of the compressor 10 and the first heat exchanger 12 are connected when the leakage detection unit 30 detects that the refrigerant has leaked. .
  • the auxiliary flow rate adjusting unit 20 is closed, after the refrigerant flowing through the indoor units 3a and 3b flows into the outdoor unit 2, the flow is blocked by the auxiliary flow rate adjusting unit 20, and the refrigerant flows from the outdoor unit 2 to the indoor again. It does not flow into the machines 3a and 3b. Therefore, the refrigerant flowing in the indoor units 3a and 3b is collected in the outdoor unit 2.
  • the outdoor unit 2 further provided with the compressor 10, the flow path switching unit 11, the first heat exchanger 12, the accumulator 17, and the auxiliary flow rate adjusting unit 20 is further provided.
  • the auxiliary flow rate adjusting unit 20 is provided in the outdoor unit 2, if the auxiliary flow rate adjusting unit 20 is closed, the refrigerant flowing through the indoor units 3a and 3b flows into the outdoor unit 2, The flow is interrupted in the outdoor unit 2 provided with the flow rate adjusting unit 20. Accordingly, the refrigerant is collected in the outdoor unit 2.
  • the first heat exchanger 12 is further provided with a blower 13 that blows air, and the control unit 40 has a function of operating the blower 13 at the maximum number of revolutions when the leakage detector 30 detects that the refrigerant has leaked. Have.
  • the 1st heat exchanger 12 which acts as a condenser, a refrigerant becomes easy to condense. Therefore, an increase in the discharge pressure of the refrigerant discharged from the compressor 10 can be suppressed.
  • the leak detection unit 30 includes a discharge pressure detection unit 31 that detects the discharge pressure of the refrigerant discharged from the compressor 10, and the control unit 40 detects that the discharge pressure detected by the discharge pressure detection unit 31 is equal to or greater than the discharge pressure threshold. In this case, it has a function of closing the branch flow rate adjusting unit 22. Thereby, the quantity of the refrigerant
  • the leakage detection unit 30 includes a suction pressure detection unit 32 that detects the suction pressure of the refrigerant sucked into the compressor 10, and the control unit 40 determines that the suction pressure detected by the suction pressure detection unit 32 is the suction pressure. When it is equal to or less than the threshold value, the branch flow rate adjusting unit 22 is closed. Thereby, the quantity of the refrigerant
  • control unit 40 opens each branch flow rate adjusting unit 22 when the leakage detection unit 30 detects that the refrigerant has leaked in the plurality of outdoor units 2. It may be a thing. Thereby, even if the air conditioning capability is increased by the plurality of outdoor units 2, the same effects as those of the first embodiment can be obtained.
  • a plurality of indoor units 3a and 3b that are provided indoors and have expansion sections 14a and 14b and second heat exchangers 15a and 15b, respectively, and that perform a cooling operation or a heating operation, and an outdoor unit 2 and a plurality of indoor units.
  • 3a, 3b may be connected, and the relay machine which distributes the refrigerant
  • Air conditioning apparatus 2 outdoor unit, 3a, 3b indoor unit, 4 refrigerant circuit, 5 piping, 6, 7 refrigerant piping, 8 refrigerant main pipe, 10 compressor, 11 flow path switching part, 12 1st heat exchanger, 13 blower, 14a, 14b expansion section, 15a, 15b second heat exchanger, 16a, 16b indoor blower, 17 accumulator, 20 sub flow adjustment section, 21 branch pipe, 22 branch flow adjustment section, 30 leak detection section, 31 Discharge pressure detector, 32, suction pressure detector, 33, discharge temperature detector, 34a, 34b, first heat exchange temperature detector, 35a, 35b, second heat exchange temperature detector, 36a, 36b, indoor temperature detector, 40 Control unit.

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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)

Abstract

La présente invention concerne un climatiseur comprenant : un circuit de fluide frigorigène qui est constitué par un compresseur, un premier échangeur de chaleur, une unité de détente, un second échangeur de chaleur et un accumulateur raccordés par des tuyaux et à travers lesquels un fluide frigorigène s'écoule ; un tuyau de dérivation qui est raccordé au tuyau raccordé au côté refoulement du compresseur de façon à communiquer avec l'extérieur d'une pièce ; et une unité de réglage de débit de dérivation qui est disposée dans le tuyau de dérivation de façon à ajuster le débit du fluide frigorigène s'écoulant à travers le tuyau de dérivation.
PCT/JP2016/061771 2016-04-12 2016-04-12 Climatiseur WO2017179117A1 (fr)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
PCT/JP2016/061771 WO2017179117A1 (fr) 2016-04-12 2016-04-12 Climatiseur

Publications (1)

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WO2017179117A1 true WO2017179117A1 (fr) 2017-10-19

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WO (1) WO2017179117A1 (fr)

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51133853U (fr) * 1975-04-18 1976-10-28
JPS6174078U (fr) * 1984-10-23 1986-05-19
JPH08327195A (ja) * 1995-05-29 1996-12-13 Sanyo Electric Co Ltd 冷凍装置
JP2001071741A (ja) * 1999-09-02 2001-03-21 Zexel Valeo Climate Control Corp 車両用空調装置
JP2002228281A (ja) * 2001-01-31 2002-08-14 Sanyo Electric Co Ltd 空気調和機
JP2010002137A (ja) * 2008-06-20 2010-01-07 Daikin Ind Ltd 空気調和機
JP2010007998A (ja) * 2008-06-27 2010-01-14 Daikin Ind Ltd 空気調和機の室内ユニットおよびそれを備えた空気調和機
WO2011141959A1 (fr) * 2010-05-12 2011-11-17 三菱電機株式会社 Appareil de commande et appareil de climatisation
JP2013122364A (ja) * 2011-11-07 2013-06-20 Mitsubishi Electric Corp 冷凍空調装置及び冷凍空調システム
JP2013178075A (ja) * 2012-02-06 2013-09-09 Daikin Industries Ltd 冷凍装置
JP2013178073A (ja) * 2012-02-06 2013-09-09 Daikin Industries Ltd 冷凍装置
EP2728280A1 (fr) * 2012-11-02 2014-05-07 LG Electronics, Inc. Climatiseur et son procédé de fonctionnement
JP2015094574A (ja) * 2013-11-14 2015-05-18 ダイキン工業株式会社 空気調和機
WO2015140876A1 (fr) * 2014-03-17 2015-09-24 三菱電機株式会社 Dispositif à cycle de réfrigération

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51133853U (fr) * 1975-04-18 1976-10-28
JPS6174078U (fr) * 1984-10-23 1986-05-19
JPH08327195A (ja) * 1995-05-29 1996-12-13 Sanyo Electric Co Ltd 冷凍装置
JP2001071741A (ja) * 1999-09-02 2001-03-21 Zexel Valeo Climate Control Corp 車両用空調装置
JP2002228281A (ja) * 2001-01-31 2002-08-14 Sanyo Electric Co Ltd 空気調和機
JP2010002137A (ja) * 2008-06-20 2010-01-07 Daikin Ind Ltd 空気調和機
JP2010007998A (ja) * 2008-06-27 2010-01-14 Daikin Ind Ltd 空気調和機の室内ユニットおよびそれを備えた空気調和機
WO2011141959A1 (fr) * 2010-05-12 2011-11-17 三菱電機株式会社 Appareil de commande et appareil de climatisation
JP2013122364A (ja) * 2011-11-07 2013-06-20 Mitsubishi Electric Corp 冷凍空調装置及び冷凍空調システム
JP2013178075A (ja) * 2012-02-06 2013-09-09 Daikin Industries Ltd 冷凍装置
JP2013178073A (ja) * 2012-02-06 2013-09-09 Daikin Industries Ltd 冷凍装置
EP2728280A1 (fr) * 2012-11-02 2014-05-07 LG Electronics, Inc. Climatiseur et son procédé de fonctionnement
JP2015094574A (ja) * 2013-11-14 2015-05-18 ダイキン工業株式会社 空気調和機
WO2015140876A1 (fr) * 2014-03-17 2015-09-24 三菱電機株式会社 Dispositif à cycle de réfrigération

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