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WO2018100712A1 - Dispositif à cycle de réfrigération - Google Patents

Dispositif à cycle de réfrigération Download PDF

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Publication number
WO2018100712A1
WO2018100712A1 PCT/JP2016/085726 JP2016085726W WO2018100712A1 WO 2018100712 A1 WO2018100712 A1 WO 2018100712A1 JP 2016085726 W JP2016085726 W JP 2016085726W WO 2018100712 A1 WO2018100712 A1 WO 2018100712A1
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WO
WIPO (PCT)
Prior art keywords
pressure
compressor
threshold
refrigeration cycle
cycle apparatus
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2016/085726
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English (en)
Japanese (ja)
Inventor
克也 前田
栗田　慎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2016/085726 priority Critical patent/WO2018100712A1/fr
Publication of WO2018100712A1 publication Critical patent/WO2018100712A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle

Definitions

  • the present invention relates to a refrigeration cycle apparatus having a function of protecting a compressor.
  • the refrigeration cycle apparatus has a function of protecting the compressor.
  • a function for protecting the compressor for example, a function called a low-pressure cut can be cited.
  • the low pressure cut is a function of stopping the operation of the refrigeration cycle apparatus when the low pressure side pressure, which is the pressure of the refrigerant on the suction side of the compressor, is equal to or lower than a preset pressure threshold value, for example.
  • a preset pressure threshold value for example.
  • a low-pressure cut function is added to the refrigeration cycle apparatus.
  • Examples where the pressure falls below the pressure threshold include sudden frequency increases (especially immediately after start-up), load up due to rapid capacity control, refrigerant leakage, failure of the expansion section, or failure of the blower provided on the evaporator side, etc. It is done.
  • Patent Document 1 discloses an air conditioner having a low-pressure cut function. Since the operation of the compressor is difficult to stabilize for a while after the compressor is started, the low pressure cut is likely to operate. Patent document 1 fixes the opening degree of the expansion part to an initial opening degree that is higher than normal until a predetermined time has elapsed since the start of the compressor, and after the predetermined time has elapsed, The opening degree of the expansion part is adjusted so that the temperature of the discharged refrigerant converges to the set temperature. Thereby, patent document 1 tries to suppress that a low-pressure cut operates excessively immediately after a compressor starts.
  • the operating condition of the low pressure cut is that the pressure on the low pressure side is equal to or lower than the pressure threshold. For this reason, the temperature of the refrigerant discharged from the compressor when a problem such as a sudden increase in frequency (especially immediately after startup), a load increase due to sudden capacity control, a failure of the expansion section, or clogging of the piping through which the refrigerant flows occurs. As the pressure rises rapidly, the sliding surface formed in the compression chamber of the compressor and the casing in contact with the sliding surface may be seized before the low pressure cut operates.
  • Patent Document 1 when a problem such as a sudden frequency increase (especially immediately after start-up), a load up due to a sudden capacity control, a failure of an expansion part or a clogging of a pipe through which a refrigerant flows occurs, the low pressure cut is performed. Operation may be delayed.
  • the present invention has been made in order to solve the above-described problems, such as a sudden frequency increase (especially immediately after start-up), a load up due to a sudden capacity control, a failure of an expansion part, or a clogging of a pipe through which a refrigerant flows.
  • a refrigeration cycle apparatus in which a protection mode such as a low pressure cut operates reliably when a problem occurs.
  • a compressor, a first heat exchanger, an expansion unit, and a second heat exchanger are connected by piping, and a refrigerant circuit through which refrigerant flows and pressure of the refrigerant in the compressor are detected.
  • a pressure detection unit and a control unit that has a protection mode for protecting the compressor and controls the operation of the refrigerant circuit, and the control unit calculates a fluctuation value of the pressure detected by the pressure detection unit.
  • the protection mode when the calculated fluctuation value is equal to or greater than the fluctuation threshold, the protection mode is executed. For this reason, even if a problem such as a failure of the expansion section or clogging of the piping through which the refrigerant flows occurs and the pressure on the low pressure side suddenly changes before the pressure on the low pressure side drops significantly, the protection mode is also activated. Executed. Therefore, when a problem such as a failure of the expansion portion or a clogging of a pipe through which the refrigerant flows occurs, the protection mode operates reliably.
  • FIG. 1 is a circuit diagram showing a refrigeration cycle apparatus 1 according to Embodiment 1 of the present invention. It is a block diagram which shows the control part 40 of the refrigeration cycle apparatus 1 which concerns on Embodiment 1 of this invention. It is a graph which shows the relationship between the pressure of the low voltage
  • FIG. 1 is a circuit diagram showing a refrigeration cycle apparatus 1 according to Embodiment 1 of the present invention.
  • the refrigeration cycle apparatus 1 will be described based on FIG.
  • the refrigeration cycle apparatus 1 includes a refrigerant circuit 2, a pressure detection unit 20, an inverter unit 30, and a control unit 40.
  • the compressor 10 In the refrigerant circuit 2, the compressor 10, the first heat exchanger 11, the expansion unit 12, and the second heat exchanger 13 are connected by the pipe 3, and the refrigerant flows inside the pipe 3. .
  • 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 includes, for example, a casing 10a, a compression mechanism unit 10b, and a rotation mechanism unit 10c.
  • a compression mechanism unit 10b and a rotation mechanism unit 10c are provided inside the casing 10a, and the rotation mechanism unit 10c rotates the compression mechanism unit 10b to compress the refrigerant flowing into the compression chamber of the compression mechanism unit 10b.
  • the compressor 10 is, for example, a screw compressor, and is, for example, an inverter compressor capable of controlling the capacity.
  • the compressor 10 is not limited to a screw compressor, and may be another type of compressor such as a scroll compressor or a reciprocating compressor. Further, the compressor 10 is not limited to an inverter compressor, and may be a constant speed compressor.
  • a refrigerant generally called a low GWP refrigerant having a low global warming potential may be used.
  • the first heat exchanger 11 exchanges heat between the refrigerant discharged from the compressor 10 and the heat medium, and acts as a condenser.
  • the first heat exchanger 11 is installed, for example, outdoors, and the heat medium is, for example, outdoor air.
  • the expansion unit 12 is a pressure reducing valve or an expansion valve that expands the refrigerant flowing out of the first heat exchanger 11 by reducing the pressure.
  • the expansion part 12 is an electronic expansion valve whose opening degree is adjusted, for example.
  • the second heat exchanger 13 exchanges heat between the refrigerant flowing out of the expansion unit 12 and the heat medium, and functions as an evaporator.
  • the second heat exchanger 13 is installed indoors, for example, and the heat medium is indoor air, for example.
  • the refrigerant circuit 2 may be connected to a flow path switching unit such as a four-way valve.
  • the flow path switching unit can switch whether the refrigerant discharged from the compressor 10 flows to the first heat exchanger 11 or the second heat exchanger 13.
  • the second heat exchanger 13 acts as a condenser
  • the first heat exchanger 11 acts as an evaporator.
  • the pressure detector 20 is arranged, for example, on the suction side of the compressor 10 and detects the pressure of the refrigerant flowing on the suction side of the compressor 10, that is, the pressure on the low pressure side.
  • the pressure detection unit 20 is provided between the compressor 10 and the second heat exchanger 13.
  • the pressure detector 20 detects the pressure every predetermined time. In addition, when the detection by the pressure detection part 20 is unnecessary, the detection by the pressure detection part 20 may be masked. Further, the pressure detection unit 20 may detect the pressure of the refrigerant flowing on the discharge side of the compressor 10, that is, the pressure on the high pressure side. In this case, the pressure detection unit 20 is provided between the compressor 10 and the first heat exchanger 11, for example.
  • the inverter unit 30 controls the driving frequency of the compressor 10 and is connected to the rotation mechanism unit 10c, the control unit 40, and a power supply source (not shown) of the compressor 10.
  • the inverter unit 30 controls the power supplied from the power supply source to the compressor 10 based on the frequency instructed by the control unit 40. Thereby, the compressor 10 is driven at a predetermined drive frequency.
  • FIG. 2 is a block diagram showing the control unit 40 of the refrigeration cycle apparatus 1 according to Embodiment 1 of the present invention.
  • the control unit 40 controls the operation of the refrigerant circuit 2.
  • the control unit 40 controls the frequency of the inverter unit 30, the opening degree of the expansion unit 12, and the like, and sends an instruction to each device.
  • the control unit 40 has a protection mode for protecting the compressor 10.
  • the protection mode controls the operation of the refrigerant circuit 2 so as to protect the compressor 10.
  • the protection mode is, for example, a low pressure cut.
  • the low pressure cut is to stop the operation of the refrigerant circuit 2 and stop the refrigeration cycle apparatus 1 when a preset condition is satisfied.
  • the low pressure cut generally means that the operation of the refrigerant circuit 2 is stopped by cutting the power supply.
  • the protection mode may be implemented by changing the compressor 10 from inverter control to mechanical capacity control. Further, the protection mode may be implemented by controlling the inverter unit 30 to reduce the driving frequency of the compressor 10.
  • control unit 40 includes a calculation unit 41 and an execution unit 42.
  • the calculating means 41 calculates a fluctuation value per unit time of the pressure detected by the pressure detection unit 20.
  • the fluctuation value is an instantaneous pressure difference and is an index indicating how much the pressure changes.
  • the fluctuation value is, for example, the fluctuation speed of the pressure detected by the pressure detection unit 20.
  • the fluctuation speed is, for example, a value obtained by dividing a minute pressure difference ⁇ P that fluctuates during a minute time difference ⁇ t by a minute time difference ⁇ t (see FIG. 3).
  • the fluctuation value may be a pressure fluctuation acceleration detected by the pressure detection unit 20.
  • the fluctuation acceleration is, for example, a value obtained by dividing a minute fluctuation speed difference ⁇ v that fluctuates during a minute time difference ⁇ t by a minute time difference ⁇ t. Furthermore, both the fluctuation speed and the fluctuation acceleration may be calculated as the fluctuation value.
  • the execution means 42 executes the protection mode when the fluctuation value calculated by the calculation means 41 is equal to or greater than a preset fluctuation threshold.
  • the variation threshold value is set in advance, but can be changed as appropriate.
  • the fluctuation threshold is, for example, a fluctuation speed threshold.
  • the variation threshold may be a threshold for variation acceleration. Further, the fluctuation threshold may be both a fluctuation speed threshold and a fluctuation acceleration threshold.
  • the execution means 42 has a function of executing the protection mode when the pressure detected by the pressure detection unit 20 is equal to or lower than the pressure threshold.
  • the pressure threshold is set in advance, but can be changed as appropriate, and can be obtained, for example, by an experiment.
  • the execution means 42 protects the compressor 10 by executing the protection mode when the pressure is equal to or lower than the pressure threshold.
  • the protection mode is not executed only when both the first condition that the pressure is larger than the pressure threshold and the second condition that the fluctuation value is smaller than the fluctuation threshold are satisfied. That is, if one of the first condition and the second condition is missing, the protection mode is executed.
  • the present invention is not limited to this, and the protection mode may not be executed when the second condition is satisfied, and the protection mode may be executed when the second condition is missing.
  • the fluctuation value may be only the fluctuation speed, only the fluctuation acceleration, or both the fluctuation speed and the fluctuation acceleration.
  • FIG. 3 is a graph showing the relationship between the pressure on the low pressure side and time in Embodiment 1 of the present invention.
  • the horizontal axis represents time (sec)
  • the vertical axis represents pressure on the low pressure side (MPa).
  • the execution unit 42 executes the protection mode, so the operation of the refrigeration cycle apparatus 1 is stopped.
  • the refrigeration cycle apparatus 1 is stopped when the fluctuation value is equal to or greater than the fluctuation threshold even if the pressure is not equal to or lower than the pressure threshold.
  • the fluctuation value may be a fluctuation speed, a fluctuation acceleration, or both a fluctuation speed and a fluctuation acceleration.
  • the refrigerant flow of the refrigeration cycle apparatus 1 will be described.
  • 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 flows into the first heat exchanger 11 that acts as a condenser, and is heat-exchanged with a heat medium such as outdoor air in the first heat exchanger 11.
  • the condensed liquid refrigerant flows into the expansion section 12 and is expanded and depressurized in the expansion section 12 to become a low-temperature low-pressure gas-liquid two-phase refrigerant.
  • the gas-liquid two-phase refrigerant flows into the second heat exchanger 13 acting as an evaporator, and in the second heat exchanger 13, heat exchange with a heat medium such as room air is performed to evaporate gas. .
  • a heat medium such as room air
  • the second heat exchanger 13 is installed indoors, the indoor air is cooled and cooling is performed.
  • the evaporated low-temperature and low-pressure gaseous refrigerant is sucked into the compressor 10.
  • the refrigeration cycle apparatus 1 can also heat the room.
  • FIG. 4 is a flowchart showing the operation of the refrigeration cycle apparatus 1 according to Embodiment 1 of the present invention.
  • the operation of the refrigeration cycle apparatus 1 will be described.
  • the operation of the refrigeration cycle apparatus 1 is started.
  • the pressure of the refrigerant flowing on the suction side of the compressor 10, that is, the pressure on the low pressure side is detected by the pressure detection unit 20 (step ST1).
  • the calculation unit 41 calculates a fluctuation value per unit time of the pressure detected by the pressure detection unit 20 (step ST2).
  • the execution means 42 determines whether or not the pressure detected by the pressure detector 20 is larger than the pressure threshold. Further, the execution means 42 determines whether or not the fluctuation value calculated by the calculation means 41 is smaller than the fluctuation threshold (step ST3).
  • the pressure is larger than the pressure threshold value and the fluctuation value is smaller than the fluctuation threshold value (Yes in step ST3), the operation of the refrigeration cycle apparatus 1 is continued, and the process returns to step ST1.
  • the operation of the refrigeration cycle apparatus 1 is continued when both the first condition that the pressure is larger than the pressure threshold and the second condition that the fluctuation value is smaller than the fluctuation threshold are satisfied. .
  • the protection mode is executed by the execution means 42. If the fluctuation value is equal to or greater than the fluctuation threshold (No in step ST3), the protection mode is executed by the execution means 42. As described above, if either one of the first condition and the second condition is missing, the protection mode is executed. The operation of the refrigerant circuit 2 is controlled by the protection mode so as to protect the compressor 10 (step ST4).
  • the protection mode is executed when the calculated fluctuation value is equal to or greater than the fluctuation threshold. For this reason, problems such as a sudden frequency increase (especially immediately after start-up), a load-up due to a sudden capacity control, a failure of the expansion part 12 or a clogging of the piping 3 through which the refrigerant flows occur, and the pressure on the low pressure side itself is greatly increased.
  • the protection mode is also executed when the pressure on the low-pressure side suddenly changes before dropping. Accordingly, the protection mode is reliably operated when a problem such as a sudden frequency increase (particularly immediately after startup), a load up due to a sudden capacity control, a failure of the expansion section 12, or a clogging of the pipe 3 through which the refrigerant flows.
  • the protection mode is surely operated even when the load is increased due to the sudden capacity control, not only the sudden frequency increase.
  • this Embodiment 1 is effective also when the compressor 10 is an inverter compressor, and is effective also when the compressor 10 is a constant speed compressor.
  • the gas density is smaller than that of R407C and R404A, etc., so the circulation amount of the refrigerant is small, and the temperature detection by the temperature detection unit is less likely to follow the actual temperature. .
  • the operating frequency is increased rapidly immediately after starting the compressor or in the low speed region, the circulating amount of the refrigerant increases, but the temperature detection by the temperature detector is difficult to follow the actual temperature, so the protection mode is executed. Before being done, there is a risk that the outer peripheral surface of the screw, which is a sliding surface formed in the compression chamber of the compressor, and the casing in contact with the sliding surface will be seized.
  • the protection mode is executed when the fluctuation value is equal to or larger than the fluctuation threshold. For this reason, the protection mode is executed even when the pressure on the low pressure side changes abruptly. Therefore, seizure of the outer peripheral surface of the screw, which is a sliding surface formed in the compression chamber of the compressor 10, and the casing 10a in contact with the sliding surface can be suppressed.
  • the execution means 42 has a function of executing the protection mode when the pressure detected by the pressure detection unit 20 is equal to or lower than the pressure threshold.
  • the protection mode is executed based on one of two conditions: a first condition that the pressure is larger than the pressure threshold value and a second condition that the fluctuation value is smaller than the fluctuation threshold value. Decide whether or not to do. For this reason, even if the pressure on the low pressure side changes gradually, the protection mode is executed if the pressure on the low pressure side becomes equal to or lower than the pressure threshold. As described above, if either one of the two conditions is missing, the protection mode is executed. Therefore, the compressor 10 is compared with the conventional technique in which the protection mode is executed only when the pressure is equal to or lower than the pressure threshold. Protective property is improved.
  • FIG. FIG. 5 is a block diagram showing control unit 140 of refrigeration cycle apparatus 100 according to Embodiment 2 of the present invention.
  • the second embodiment is different from the first embodiment in the function of the execution unit 142.
  • the same parts as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The description will focus on differences from the first embodiment.
  • the execution unit 142 of the control unit 140 determines that the time since the start of the compressor 10 exceeds the time threshold, or the variation value calculated by the calculation unit 41 is greater than or equal to the variation threshold.
  • the function for executing the protection mode is stopped. That is, the execution means 142 executes the protection mode only when the time since the compressor 10 is started exceeds the time threshold, and when the pressure is equal to or lower than the pressure threshold.
  • the time threshold is set to 30 seconds, for example, but can be changed as appropriate depending on the type of refrigerant, the startup pattern of the compressor 10, and the like.
  • the control unit 140 according to the second embodiment has measuring means (not shown) that measures the time since the compressor 10 is started. The execution unit 142 determines whether or not the time since the compressor 10 has started exceeds the time threshold based on the time measured by the measurement unit.
  • the execution unit 142 determines that the variation value calculated by the calculation unit 41 is equal to or greater than the variation threshold, and pressure detection. If either one of the two conditions of the case where the pressure detected by the unit 20 is equal to or lower than the pressure threshold is satisfied, the protection mode is executed. On the other hand, after the time threshold is exceeded after the compressor 10 is activated, the execution unit 142 executes the protection mode by satisfying one condition that the pressure detected by the pressure detection unit 20 is equal to or lower than the pressure threshold. Is done.
  • the operation of the execution unit 142 after the time threshold is exceeded after the compressor 10 is started may be changed. Specifically, immediately after the compressor 10 is started and immediately after the time threshold is exceeded, the execution unit 142 performs a case where the variation value calculated by the calculation unit 41 is equal to or greater than the variation threshold, as described above. If any one of the two conditions of the case where the pressure detected by the pressure detection unit 20 is equal to or lower than the pressure threshold is satisfied, the protection mode is executed. On the other hand, after the compressor 10 is started, after the time threshold is exceeded, and before the time threshold is exceeded, the execution unit 142 determines that the variation value calculated by the calculation unit 41 is greater than or equal to the variation threshold, and pressure detection.
  • the protection mode is executed, but this variation threshold value is different from the variation threshold value immediately after activation.
  • the fluctuation threshold after exceeding the time threshold after activation is larger than the fluctuation threshold immediately after activation.
  • the seizure is less likely to occur even if the same level of sudden low pressure drop occurs after the compressor 10 has started up and after the time threshold has been exceeded than when the compressor 10 has started.
  • FIG. 6 is a flowchart showing the operation of the refrigeration cycle apparatus 100 according to Embodiment 2 of the present invention. Next, the operation of the refrigeration cycle apparatus 100 will be described. As shown in FIG. 6, first, the operation of the refrigeration cycle apparatus 100 is started. When the operation of the refrigeration cycle apparatus 100 is started, the pressure of the refrigerant flowing on the suction side of the compressor 10, that is, the pressure on the low pressure side is detected by the pressure detection unit 20 (step ST11). Next, it is determined by the execution means 142 whether the time after starting the compressor 10 exceeded the time threshold value (step ST12).
  • the calculation unit 41 calculates the fluctuation value per unit time of the pressure detected by the pressure detection unit 20 (step). ST13). Then, the execution unit 142 determines whether or not the pressure detected by the pressure detection unit 20 is greater than the pressure threshold. Further, the execution means 142 determines whether or not the fluctuation value calculated by the calculation means 41 is smaller than the fluctuation threshold (step ST14). When the pressure is larger than the pressure threshold value and the fluctuation value is smaller than the fluctuation threshold value (Yes in step ST14), the operation of the refrigeration cycle apparatus 100 is continued, and the process returns to step ST11. As described above, the operation of the refrigeration cycle apparatus 100 is continued when both the first condition that the pressure is greater than the pressure threshold and the second condition that the fluctuation value is smaller than the fluctuation threshold are satisfied. .
  • the protection mode is executed by the execution unit 142.
  • the fluctuation value is equal to or larger than the fluctuation threshold (No in step ST14)
  • the protection mode is executed by the execution unit 142.
  • the protection mode is executed.
  • the operation of the refrigerant circuit 2 is controlled by the protection mode so as to protect the compressor 10 (step ST15).
  • step ST12 when the time since the start of the compressor 10 exceeds the time threshold (Yes in step ST12), a part of the function of the execution unit 142 is stopped (step ST16). Specifically, in the execution unit 142, the function of executing the protection mode is stopped when the variation value calculated by the calculation unit 41 is equal to or greater than the variation threshold. And it is determined by the execution means 142 whether the pressure detected in the pressure detection part 20 is larger than a pressure threshold value (step ST17). When the pressure is greater than the pressure threshold (Yes in step ST17), the operation of the refrigeration cycle apparatus 100 is continued, and the process returns to step ST11.
  • the operation of the refrigeration cycle apparatus 100 is continued.
  • the protection mode is executed by the execution unit 142.
  • the protection mode is executed.
  • the operation of the refrigerant circuit 2 is controlled by the protection mode so as to protect the compressor 10 (step ST18).
  • the low pressure sudden drop is about the same level after the time threshold is exceeded after the compressor 10 is started, rather than immediately after the compressor 10 is started.
  • 1 refrigeration cycle apparatus 1 refrigeration cycle apparatus, 2 refrigerant circuit, 3 piping, 10 compressor, 10a casing, 10b compression mechanism section, 10c rotation mechanism section, 11 first heat exchanger, 12 expansion section, 13 second heat exchanger, 20 Pressure detection unit, 30 inverter unit, 40 control unit, 41 calculation unit, 42 execution unit, 100 refrigeration cycle apparatus, 140 control unit, 142 execution unit.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

L'invention concerne un dispositif à cycle de réfrigération comprenant : un circuit de fluide frigorigène à travers lequel s'écoule un fluide frigorigène et dans lequel un compresseur, un premier échangeur de chaleur, une section d'expansion et un second échangeur de chaleur sont reliés par des tuyaux; un détecteur de pression qui détecte la pression du fluide frigorigène dans le compresseur; et une unité de commande qui commande le fonctionnement du circuit de fluide frigorigène et a un mode de protection, sous lequel le compresseur est protégé. L'unité de commande comporte un moyen de calcul permettant de calculer la valeur de variation pour la pression détectée par le détecteur de pression, et un moyen d'exécution pour exécuter le mode de protection si la valeur de variation calculée par le moyen de calcul est égale ou supérieure à une valeur de seuil de variation définie à l'avance.
PCT/JP2016/085726 2016-12-01 2016-12-01 Dispositif à cycle de réfrigération Ceased WO2018100712A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/085726 WO2018100712A1 (fr) 2016-12-01 2016-12-01 Dispositif à cycle de réfrigération

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Application Number Priority Date Filing Date Title
PCT/JP2016/085726 WO2018100712A1 (fr) 2016-12-01 2016-12-01 Dispositif à cycle de réfrigération

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WO2018100712A1 true WO2018100712A1 (fr) 2018-06-07

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019187526A1 (fr) * 2018-03-28 2019-10-03 三菱重工サーマルシステムズ株式会社 Dispositif de commande, compresseur, compresseur électrique, compresseur entraîné par courroie, climatiseur de véhicule et procédé de commande
CN113916574A (zh) * 2021-09-30 2022-01-11 珠海格力电器股份有限公司 一种制冷机组检验方法、装置和设备及系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000320936A (ja) * 1999-05-11 2000-11-24 Bosch Automotive Systems Corp 冷凍サイクルの安全装置
JP2010025418A (ja) * 2008-07-17 2010-02-04 Daikin Ind Ltd 冷凍装置
JP2011106721A (ja) * 2009-11-17 2011-06-02 Seimitsu:Kk 精密温度制御空調機
WO2015136979A1 (fr) * 2014-03-14 2015-09-17 三菱電機株式会社 Dispositif à cycle frigorifique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000320936A (ja) * 1999-05-11 2000-11-24 Bosch Automotive Systems Corp 冷凍サイクルの安全装置
JP2010025418A (ja) * 2008-07-17 2010-02-04 Daikin Ind Ltd 冷凍装置
JP2011106721A (ja) * 2009-11-17 2011-06-02 Seimitsu:Kk 精密温度制御空調機
WO2015136979A1 (fr) * 2014-03-14 2015-09-17 三菱電機株式会社 Dispositif à cycle frigorifique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019187526A1 (fr) * 2018-03-28 2019-10-03 三菱重工サーマルシステムズ株式会社 Dispositif de commande, compresseur, compresseur électrique, compresseur entraîné par courroie, climatiseur de véhicule et procédé de commande
CN113916574A (zh) * 2021-09-30 2022-01-11 珠海格力电器股份有限公司 一种制冷机组检验方法、装置和设备及系统

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