WO2020065998A1 - 冷凍サイクル装置の室外機、冷凍サイクル装置、及び空気調和装置 - Google Patents

冷凍サイクル装置の室外機、冷凍サイクル装置、及び空気調和装置 Download PDF

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Publication number
WO2020065998A1
WO2020065998A1 PCT/JP2018/036523 JP2018036523W WO2020065998A1 WO 2020065998 A1 WO2020065998 A1 WO 2020065998A1 JP 2018036523 W JP2018036523 W JP 2018036523W WO 2020065998 A1 WO2020065998 A1 WO 2020065998A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
refrigeration cycle
heater
pipe
unit
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PCT/JP2018/036523
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English (en)
French (fr)
Japanese (ja)
Inventor
智隆 石川
亮 築山
Original Assignee
三菱電機株式会社
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.)
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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 JP2020547861A priority Critical patent/JP7196186B2/ja
Priority to PCT/JP2018/036523 priority patent/WO2020065998A1/ja
Priority to CN201880097187.8A priority patent/CN112714852B/zh
Publication of WO2020065998A1 publication Critical patent/WO2020065998A1/ja

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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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/26—Refrigerant piping
    • F24F1/30—Refrigerant piping for use inside the separate outdoor units
    • 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
    • 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

Definitions

  • the present disclosure relates to an outdoor unit of a refrigeration cycle device, a refrigeration cycle device, and an air conditioner.
  • WO 2016/135904 discloses a refrigeration system.
  • This refrigerating apparatus includes a heat source side unit and a use side unit (indoor unit) connected to the heat source side unit by a pipe.
  • the heat source side unit includes a compressor, a condenser, and a subcooler.
  • the use side unit includes an expansion valve and an evaporator.
  • the suitability of the amount of refrigerant charged in the refrigerant circuit is determined using the temperature efficiency of the subcooler.
  • the temperature efficiency is a value obtained by dividing the degree of supercooling of the refrigerant at the outlet of the subcooler by the maximum temperature difference of the subcooler. According to this refrigeration apparatus, it is possible to detect a shortage of the refrigerant in the refrigerant circuit (see Patent Document 1).
  • the present disclosure has been made in order to solve such a problem, and an object of the present disclosure is to provide an outdoor unit of a refrigeration cycle device capable of accurately detecting a shortage of refrigerant sealed in a refrigerant circuit, and a refrigeration cycle including the same. Device, as well as an air conditioner.
  • the outdoor unit of the present disclosure is an outdoor unit of a refrigeration cycle device, and includes a compressor that compresses a refrigerant, a condenser that condenses the refrigerant output from the compressor, and a part of the refrigerant on the outlet side of the condenser.
  • a bypass circuit configured to return to the compressor without passing through the indoor unit, and a control device.
  • the bypass circuit includes a detection circuit for detecting a shortage of the refrigerant sealed in the refrigeration cycle device.
  • the detection circuit includes a flow rate adjusting unit configured to adjust a flow rate of the refrigerant flowing through the bypass circuit, and a heating unit configured to heat the refrigerant that has passed through the flow rate adjusting unit.
  • the control device determines that the refrigerant enclosed in the refrigeration cycle device is insufficient when the refrigerant that has passed through the heating unit has a degree of superheat.
  • the heating unit is configured to suppress evaporation of the liquid refrigerant.
  • the heating unit is configured to suppress the evaporation of the liquid refrigerant, all of the liquid refrigerant (refrigerant in a liquid state) passing through the heating unit when the refrigerant shortage does not occur. Evaporation is suppressed (superheat degree 0).
  • the degree of dryness of the refrigerant flowing through the heating unit is high.
  • the heating unit is configured as described above, it is possible to completely evaporate the refrigerant and generate a degree of superheat. it can.
  • this outdoor unit it is possible to suppress erroneous detection that a shortage of refrigerant has occurred even though no shortage of refrigerant has occurred.
  • the outdoor unit, the refrigeration cycle device, and the air conditioner of the present disclosure it is possible to accurately detect the shortage of the refrigerant sealed in the refrigerant circuit.
  • FIG. 1 is an overall configuration diagram of a refrigeration apparatus using an outdoor unit according to Embodiment 1 of the present disclosure.
  • FIG. 7 is a ph diagram showing a relationship between the pressure of the refrigerant and the enthalpy in a normal state where the shortage of the refrigerant does not occur.
  • FIG. 4 is a ph diagram showing the state of the refrigerant when the refrigerant is insufficient.
  • FIG. 3 is a diagram illustrating an example of a configuration of a heating unit according to the first embodiment.
  • 2 is a flowchart illustrating an example of a processing procedure of a refrigerant shortage determination executed by the control device illustrated in FIG. 1.
  • 13 is a diagram illustrating an example of a configuration of a heating unit according to Embodiment 2.
  • FIG. It is a figure showing composition of an outdoor unit in a modification.
  • 1 is an overall configuration diagram of an air conditioner including a refrigeration cycle in which an outdoor unit of the present disclosure is used.
  • FIG. 1 is an overall configuration diagram of a refrigeration apparatus using an outdoor unit according to Embodiment 1 of the present disclosure.
  • FIG. 1 functionally shows the connection relationship and arrangement of each device in the refrigeration apparatus, and does not show the arrangement in a physical space.
  • refrigeration apparatus 1 includes outdoor unit 2 and indoor unit 3.
  • the outdoor unit 2 includes a compressor 10, a condenser 20, a fan 22, and pipes 80, 83, 85.
  • the outdoor unit 2 further includes pipes 86 and 87, a refrigerant shortage detection circuit 70, a pressure sensor 90, and a control device 100.
  • the indoor unit 3 includes an expansion valve 50, an evaporator 60, a fan 62, and a pipe 84.
  • the indoor unit 3 is connected to the outdoor unit 2 through pipes 83 and 85.
  • the pipe 80 connects the discharge port of the compressor 10 and the condenser 20.
  • the pipe 83 connects the condenser 20 and the expansion valve 50.
  • the pipe 84 connects the expansion valve 50 and the evaporator 60.
  • the pipe 85 connects the evaporator 60 and the suction port of the compressor 10.
  • the pipe 86 connects the pipe 83 and the refrigerant shortage detection circuit 70.
  • the pipe 87 connects the refrigerant shortage detection circuit 70 and the pipe 85.
  • the compressor 10 compresses the refrigerant sucked from the pipe 85 and outputs the compressed refrigerant to the pipe 80.
  • the compressor 10 is configured to adjust the rotation speed according to a control signal from the control device 100. By adjusting the rotation speed of the compressor 10, the circulation amount of the refrigerant is adjusted, and the capacity of the refrigeration apparatus 1 can be adjusted.
  • Various types can be used for the compressor 10, and for example, a scroll type, a rotary type, a screw type, and the like can be used.
  • the condenser 20 condenses the refrigerant output from the compressor 10 to the pipe 80 and outputs the refrigerant to the pipe 83.
  • the condenser 20 is configured such that the high-temperature and high-pressure gas refrigerant output from the compressor 10 performs heat exchange (radiation) with the outside air. By this heat exchange, the refrigerant is condensed and changes to a liquid phase.
  • the fan 22 supplies the outside air to the condenser 20 where the refrigerant performs heat exchange in the condenser 20. By adjusting the rotation speed of the fan 22, the refrigerant pressure (high-pressure side pressure) on the outlet side of the compressor 10 can be adjusted.
  • the expansion valve 50 reduces the pressure of the refrigerant output from the condenser 20 to the pipe 83 and outputs the reduced pressure to the pipe 84.
  • the opening degree of the expansion valve 50 is changed in the closing direction, the refrigerant pressure on the exit side of the expansion valve 50 decreases, and the dryness of the refrigerant increases.
  • the opening of the expansion valve 50 is changed in the opening direction, the refrigerant pressure on the outlet side of the expansion valve 50 increases, and the dryness of the refrigerant decreases.
  • the evaporator 60 evaporates the refrigerant output from the expansion valve 50 to the pipe 84 and outputs the refrigerant to the pipe 85.
  • the evaporator 60 is configured such that the refrigerant decompressed by the expansion valve 50 performs heat exchange (heat absorption) with the air in the indoor unit 3.
  • the refrigerant evaporates by passing through the evaporator 60 to become superheated steam.
  • the fan 62 supplies to the evaporator 60 external air in which the refrigerant performs heat exchange in the evaporator 60.
  • the refrigerant shortage detection circuit 70 is provided between a pipe 86 branched from the pipe 83 and a pipe 87 connected to the pipe 85.
  • the pipe 86, the refrigerant shortage detection circuit 70, and the pipe 87 constitute a “bypass circuit” that returns a part of the refrigerant on the outlet side of the condenser 20 to the compressor 10 without passing through the indoor unit 3.
  • the refrigerant shortage detection circuit 70 includes a capillary tube 71, a heater 72, a temperature sensor 73, and an electromagnetic valve 74.
  • the capillary tube 71 is connected between the pipe 86 and the pipe 87, and adjusts the flow rate of the refrigerant flowing through the bypass circuit. As the refrigerant passes through the capillary tube 71, the pressure of the refrigerant decreases. Accordingly, when the liquid refrigerant is supplied from the pipe 86 (when the refrigerant amount is normal), the refrigerant that has passed through the capillary tube 71 is in a gas-liquid two-phase state with a low dryness.
  • the refrigerant that has passed through the capillary tube 71 is in a gas-liquid two-phase state with a high degree of dryness.
  • the heater 72 and the temperature sensor 73 are provided on the pipe 87.
  • the heater 72 heats the refrigerant that has passed through the capillary tube 71.
  • the enthalpy of the refrigerant is increased by being heated by the heater 72.
  • the heater 72 basically heats the refrigerant from outside the pipe 87, but may be installed inside the pipe 87 in order to more reliably transfer heat from the heater 72 to the refrigerant.
  • the temperature sensor 73 detects the temperature T of the refrigerant flowing through the pipe 87 downstream of the heating unit by the heater 72, and outputs the detected value to the control device 100.
  • the temperature sensor 73 is also installed outside the pipe 87, but may be installed inside the pipe 87 to more reliably detect the temperature of the refrigerant. The principle and method of refrigerant shortage detection by the refrigerant shortage detection circuit 70 will be described later in detail.
  • the electromagnetic valve 74 is provided in the pipe 86 upstream of the capillary tube 71 and opens and closes according to an instruction from the control device 100.
  • the solenoid valve 74 When the solenoid valve 74 is opened, the refrigerant flows through the bypass circuit, and the refrigerant shortage detection circuit 70 can detect the refrigerant shortage.
  • the solenoid valve 74 When the solenoid valve 74 is in the closed state, the flow of the refrigerant in the bypass circuit is shut off, so that the refrigerant shortage detection cannot be executed.
  • the solenoid valve 74 may be provided in a pipe 87 downstream of the capillary tube 71.
  • the pressure sensor 90 detects the refrigerant pressure (low pressure side pressure) LP on the suction side of the compressor 10 and outputs the detected value to the control device 100. Since the pipe 87 of the bypass circuit is connected to the pipe 85 on the suction side of the compressor 10, if there is no pressure loss at the connection between the pipe 87 and the pipe 85, the pressure sensor 90 detects the pressure inside the pipe 87 of the bypass circuit. Can be detected.
  • the control device 100 includes a CPU (Central Processing Unit) 102, a memory 104 (ROM (Read Only Memory) and RAM (Random Access Memory)), an input / output buffer (not shown) for inputting and outputting various signals, and the like. It is comprised including.
  • the CPU 102 executes a program stored in the ROM by expanding the program in the RAM or the like.
  • the program stored in the ROM is a program in which the processing procedure of the control device 100 is described.
  • the control device 100 controls each device in the outdoor unit 2 according to these programs. This control is not limited to processing by software, and processing by dedicated hardware (electronic circuit) is also possible.
  • the shortage of the refrigerant occurs when the initial charge amount of the refrigerant in the refrigerant circuit is insufficient or when the refrigerant leaks after the start of use.
  • FIG. 2 is a ph diagram showing the relationship between refrigerant pressure and enthalpy in a normal state where there is no shortage of refrigerant.
  • the refrigerant amount is referred to as “normal”.
  • the vertical axis represents pressure p
  • the horizontal axis represents specific enthalpy h (kJ / kg) (hereinafter, simply referred to as “enthalpy”).
  • a solid line S1 (hereinafter, referred to as "cycle 1") connecting points P11 to P14 indicates the state of the refrigerant when the refrigerant amount is normal.
  • cycle 1 point P14 ⁇ point P11 indicates compression of the refrigerant in the compressor 10 (isentropic change), and point P11 ⁇ point P12 indicates equal pressure cooling in the condenser 20.
  • a point P12 ⁇ point P13 indicates the pressure reduction in the expansion valve 50
  • a point P13 ⁇ point P14 indicates the equal pressure heating in the evaporator 60.
  • Points A1, B1, and C1 indicate states of the refrigerant at points A, B, and C on the bypass circuit shown in FIG. 1 when the refrigerant amount is normal.
  • a dotted line L11 connecting the point A1 and the point B1 indicates pressure reduction by the capillary tube 71 of the refrigerant shortage detection circuit 70.
  • a dotted line L12 connecting the point B1 and the point C1 indicates equal pressure heating by the heater 72 of the refrigerant shortage detection circuit 70. Since the outlet pipe 87 of the bypass circuit is connected to the outlet pipe 85 of the evaporator 60, the outlet pressure of the capillary tube 71 (the pressure at point B1) is equal to the pressure at the evaporator 60 (point P13). Pressure).
  • the refrigerant downstream of the heater 72 (point C1) is in a gas-liquid two-phase state, and the degree of superheat SH is zero.
  • the heating unit by the heater 72 (hereinafter, may be simply referred to as “heating unit”). )) Is configured to suppress evaporation of a liquid-phase refrigerant (hereinafter, referred to as “liquid refrigerant”) in the gas-liquid two-phase refrigerant passing through the heating unit.
  • liquid refrigerant a liquid-phase refrigerant
  • the heating unit when the refrigerant amount is normal, it is possible to suppress the generation of the degree of superheat due to the heating of the refrigerant by the heater 72.
  • the point C1 downstream of the heater 72 it is possible to prevent the point C1 downstream of the heater 72 from exceeding the saturated vapor line even though the refrigerant amount is normal.
  • FIG. 3 is a ph diagram showing the state of the refrigerant when the refrigerant is insufficient.
  • solid line S2 hereinafter, referred to as “cycle 2”
  • cycle 2 solid line S2 (hereinafter, referred to as “cycle 2”) connecting points P21 to P24 indicates the state of the refrigerant when the refrigerant amount is insufficient.
  • point P24 ⁇ point P21 indicates compression of the refrigerant in the compressor 10 (isentropic change)
  • point P21 ⁇ point P22 indicates equal pressure cooling in the condenser 20.
  • a point P22 ⁇ point P23 indicates pressure reduction in the expansion valve 50
  • a point P23 ⁇ point P24 indicates equal pressure heating in the evaporator 60.
  • the refrigerant that has passed through the heating unit of the heater 72 in the refrigerant shortage detection circuit 70 provided in the bypass circuit has a degree of superheat SH.
  • the outdoor unit 2 when the refrigerant is in a gas-liquid two-phase state at the outlet side of the condenser 20 due to a shortage of the refrigerant amount, the superheat degree SH is generated in the refrigerant that has passed through the heating unit of the refrigerant shortage detection circuit 70. Therefore, the shortage of the refrigerant can be immediately detected. Further, even in an operation state in which supercooling cannot be performed even when the refrigerant amount is normal, such as during an overload operation, a refrigerant shortage can be detected based on the degree of superheat SH.
  • the superheat degree SH of the refrigerant that has passed through the heating unit of the refrigerant shortage detection circuit 70 can be calculated from the detection value of the temperature sensor 73 and the detection value of the pressure sensor 90. That is, the detection value of the temperature sensor 73 indicates the temperature of the refrigerant heated by the heater 72. Further, the detection value of the pressure sensor 90 indicates the pressure of the refrigerant in the heating section by the heater 72. From the refrigerant pressure, the evaporation temperature of the refrigerant in the heating section (the saturation temperature of the refrigerant on the low pressure side in the refrigeration apparatus 1) can be calculated. Then, the superheat degree SH of the refrigerant heated by the heater 72 can be calculated by subtracting the evaporation temperature calculated from the detected value of the pressure sensor 90 from the detected value of the temperature sensor 73.
  • ⁇ Configuration of heating unit of refrigerant shortage detection circuit 70> As described above, in the outdoor unit 2, the refrigerant shortage is detected based on the degree of superheat SH of the refrigerant that has passed through the heating unit of the refrigerant shortage detection circuit 70. Specifically, if the superheat degree SH of the refrigerant passing through the heating unit is 0, the refrigerant amount is normal, and if the refrigerant passing through the heating unit has a superheat degree (SH> 0), the refrigerant shortage occurs. Is determined to have occurred.
  • the refrigerant shortage detection circuit 70 the specifications of the capillary tube 71 and the heater 72 are determined so that the refrigerant heated by the heater 72 does not have the degree of superheat SH when the refrigerant amount is normal.
  • the degree of superheat SH may occur depending on the operation state of the refrigeration apparatus 1, even if the refrigerant is not short, all the refrigerant that has passed through the heating unit evaporates and becomes a single-phase gas state, and the degree of superheat SH may occur.
  • piping 87 (FIG. 1) is configured to include a portion arranged vertically vertically so that the refrigerant flows downward from above by gravity. Is provided with a heater 72.
  • FIG. 4 is a diagram illustrating an example of a configuration of a heating unit using the heater 72 according to the first embodiment.
  • the direction of arrow U indicates a vertically upward direction
  • the direction of arrow D indicates a vertically downward direction.
  • the location where heater 72 is provided in pipe 87 on the outlet side of capillary tube 71 is provided vertically vertically so that the refrigerant flows from above to below (in the direction of arrow D) by gravity. Have been. Then, the heater 72 is disposed at the position where the pipe 87 is disposed vertically vertically.
  • the refrigerant flowing into the heating unit has a high degree of dryness. Therefore, even if the heating unit is configured as described above, the liquid refrigerant evaporates due to the heating by the heater 72 and the gas refrigerant also evaporates. Is heated. Therefore, when the amount of the refrigerant is insufficient, the degree of superheat SH occurs in the refrigerant that has passed through the heating unit, and it can be determined that the refrigerant is insufficient.
  • the heater 72 is provided at a vertically vertical portion of the pipe 87, but the portion is not necessarily required to be vertically vertical.
  • the portion of the pipe 87 in which the heater 72 is disposed may be vertically oriented to the extent that the effect that the liquid refrigerant drops faster than the gas refrigerant due to gravity can be effectively obtained. Note that, by setting the vertical orientation, the liquid refrigerant can be dropped by the gravity more quickly than the gas refrigerant.
  • FIG. 5 is a flowchart illustrating an example of a processing procedure for refrigerant shortage determination performed by the control device 100 illustrated in FIG. 1. A series of processes shown in this flowchart is repeatedly executed while the refrigeration apparatus 1 performs a steady operation.
  • control device 100 determines whether or not it is time to execute refrigerant shortage determination control (step S10).
  • the refrigerant shortage determination control is executed, for example, once a day.
  • control device 100 shifts the process to the return without executing the subsequent series of processes. Note that, without providing such a determination process in the flowchart, when it is time to execute the refrigerant shortage determination control, a series of processes from step S20 shown in the flowchart may be started.
  • control device 100 turns on (opens) solenoid valve 74 (step S20) and turns on heater 72. (Operation) (step S30).
  • control device 100 obtains a detected value of temperature T from temperature sensor 73.
  • the detection value of the pressure LP is obtained from the pressure sensor 90 (Step S50).
  • the control device 100 calculates the degree of superheat SH of the refrigerant that has passed through the heating unit, using the obtained detected values of the temperature T and the pressure LP (Step S60). Specifically, the relationship between the refrigerant pressure and the evaporation temperature (saturation temperature) is stored in advance in the ROM of the memory 104 as a map, a table, or the like, and the control device 100 uses the map or the like to Is calculated from the detected value of the pressure LP indicating the pressure of the refrigerant in the heating section. Then, control device 100 calculates the degree of superheat SH of the refrigerant heated by heater 72 by subtracting the calculated evaporation temperature from temperature T obtained in step S50.
  • the control device 100 determines whether the superheat degree SH is higher than a threshold value SHth (step S70).
  • This threshold value SHth is for determining whether or not the superheat degree SH has occurred in the refrigerant heated by the heater 72, and is appropriately set based on the calculation accuracy of the superheat degree SH.
  • control device 100 determines that the refrigerant amount is insufficient (step S80). An alarm indicating that a shortage of refrigerant has occurred is output (step S90). Thereafter, the control device 100 turns off (stops) the heater 72 (step S100) and turns off (closes) the solenoid valve 74 (step S110). Thereafter, control device 100 shifts the process to return, and the refrigerant shortage determination process ends.
  • control device 100 shifts the process to step S100 without executing steps S80 and S90. Then, the heater 72 is turned off (stopped) and the solenoid valve 74 is turned off (closed). That is, in this case, it is determined that the refrigerant amount is normal.
  • the first embodiment it is determined whether a refrigerant shortage has occurred based on the degree of superheat SH of the refrigerant that has passed through the heating unit of the refrigerant shortage detection circuit 70.
  • the above-described degree of superheat SH occurs, so that the shortage of the refrigerant can be immediately detected.
  • a refrigerant shortage can be detected based on the degree of superheat SH.
  • the heater 72 is provided at a position where the pipe 87 is provided vertically.
  • evaporation of the liquid refrigerant passing through the heating unit is suppressed, and when the amount of the refrigerant is normal, generation of the superheat degree SH in the refrigerant heated by the heater 72 can be suppressed. Therefore, according to the first embodiment, it is possible to suppress erroneous detection that a shortage of refrigerant has occurred even though the refrigerant amount is normal.
  • Embodiment 2 FIG.
  • the second embodiment differs from the first embodiment in the specific configuration of the heating unit of the refrigerant shortage detection circuit 70.
  • FIG. 6 is a diagram illustrating an example of a configuration of a heating unit using the heater 72 according to the second embodiment.
  • the direction of arrow U indicates a vertically upward direction
  • the direction of arrow D indicates a vertically downward direction.
  • pipe 87 includes a first portion 110 and a second portion 112.
  • the first portion 110 is disposed laterally with respect to the vertical direction.
  • the second part 112 is provided downstream of the first part 110 and is disposed vertically upward from the first part 110.
  • the heater 72 is provided at a connection portion 114 between the first portion 110 and the second portion 112.
  • the heating unit By configuring the heating unit in this manner, when the gas-liquid two-phase refrigerant including the liquid refrigerant and the gas refrigerant flows through the pipe 87, the liquid refrigerant is applied to the lower end (the connection part 114) of the second part 112 by gravity. Accumulate.
  • heater 72 is provided at connection portion 114 where a liquid pool can be formed. Since the liquid pool in which the liquid refrigerant is concentrated is heated by the heater 72, the evaporation of the liquid refrigerant is suppressed.
  • the refrigerant flowing into the heating unit has a high degree of dryness. Therefore, at the connecting portion 114 between the first portion 110 and the second portion 112, no liquid pool can be formed or a small amount of liquid can be obtained. It just creates pools. Therefore, when the refrigerant is heated at the connection portion 114 by the heater 72, all of the refrigerant evaporates. Therefore, when the amount of the refrigerant is insufficient, the degree of superheat SH occurs in the refrigerant heated by the heater 72, whereby it can be determined that the refrigerant is insufficient.
  • the configuration of the outdoor unit 2 according to the second embodiment and the refrigerating device 1 using the same are the same as the configuration of the first embodiment shown in FIG. 1 except for the configuration of the heating unit described above.
  • the temperature sensor 73 is provided downstream of the heater 72, and the superheat degree is calculated from the temperature T detected by the temperature sensor 73 and the evaporation temperature calculated from the pressure LP detected by the pressure sensor 90.
  • the SH is calculated, a temperature sensor for detecting the evaporation temperature (low pressure saturation temperature) is further provided between the capillary tube 71 and the heater 72, and the detected value of the temperature sensor is different from the detected value of the temperature sensor 73.
  • the degree of superheat SH may be measured by subtraction.
  • a refrigeration apparatus is generally provided with a pressure sensor for detecting the pressure on the suction side of the compressor.
  • a pressure sensor 90 for detecting the pressure on the suction side of the compressor.
  • an existing pressure sensor 90 can be used without separately providing a temperature sensor between the capillary tube 71 and the heater 72. Refrigerant shortage detection can be performed.
  • the bypass circuit is branched from the pipe 83 on the outlet side of the condenser 20.
  • a bypass circuit may be branched from a pipe 82 between the liquid reservoir 30 and the heat exchanger 40.
  • the refrigerating apparatus In the refrigerating apparatus, generally, such a liquid reservoir and a heat exchanger are often provided, and when the refrigerant amount is normal, the liquid refrigerant is stored in the liquid reservoir 30, Liquid refrigerant flows through the piping 86 of the bypass circuit.
  • the liquid refrigerant is not stored in the liquid reservoir 30, so that a gas-liquid two-phase or gas-phase single-phase refrigerant flows through the pipe 86 of the bypass circuit. Therefore, even with such a configuration, the refrigerant shortage can be detected by the refrigerant shortage detection circuit 70 provided in the bypass circuit.
  • the outdoor unit and the refrigeration apparatus mainly used for a warehouse, a showcase, and the like are representatively described.
  • the outdoor unit according to the present disclosure is illustrated in FIG.
  • the present invention is also applicable to the air conditioner 200 using a refrigeration cycle.
  • Refrigerator 2 outdoor unit, 3 indoor unit, 10 compressor, 20 condenser, 22, 42, 62 fan, 30 reservoir, 40 heat exchanger, 50 expansion valve, 60 evaporator, 70 refrigerant shortage detection circuit , 71 capillary tube, 72 heater, 73 temperature sensor, 74 ⁇ solenoid valve, 80-87 pipe, 90 pressure sensor, 100 control device, 102 CPU, 104 memory, 110 first part, 112 second part, 114 connection part, 200 Air conditioner.

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  • General Engineering & Computer Science (AREA)
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PCT/JP2018/036523 2018-09-28 2018-09-28 冷凍サイクル装置の室外機、冷凍サイクル装置、及び空気調和装置 WO2020065998A1 (ja)

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JP2020547861A JP7196186B2 (ja) 2018-09-28 2018-09-28 冷凍サイクル装置の室外機、冷凍サイクル装置、及び空気調和装置
PCT/JP2018/036523 WO2020065998A1 (ja) 2018-09-28 2018-09-28 冷凍サイクル装置の室外機、冷凍サイクル装置、及び空気調和装置
CN201880097187.8A CN112714852B (zh) 2018-09-28 2018-09-28 制冷循环装置的室外机、制冷循环装置以及空调装置

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PCT/JP2018/036523 WO2020065998A1 (ja) 2018-09-28 2018-09-28 冷凍サイクル装置の室外機、冷凍サイクル装置、及び空気調和装置

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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