WO2019239587A1 - Dispositif à cycle frigorifique - Google Patents

Dispositif à cycle frigorifique Download PDF

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Publication number
WO2019239587A1
WO2019239587A1 PCT/JP2018/022956 JP2018022956W WO2019239587A1 WO 2019239587 A1 WO2019239587 A1 WO 2019239587A1 JP 2018022956 W JP2018022956 W JP 2018022956W WO 2019239587 A1 WO2019239587 A1 WO 2019239587A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
expansion valve
refrigeration cycle
amount
cycle apparatus
Prior art date
Application number
PCT/JP2018/022956
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English (en)
Japanese (ja)
Inventor
宗希 石山
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.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to CN201880094106.9A priority Critical patent/CN112219074B9/zh
Priority to JP2020525064A priority patent/JP6925528B2/ja
Priority to EP18922598.0A priority patent/EP3809064A4/fr
Priority to PCT/JP2018/022956 priority patent/WO2019239587A1/fr
Publication of WO2019239587A1 publication Critical patent/WO2019239587A1/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
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0409—Refrigeration circuit bypassing means for the evaporator
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0411—Refrigeration circuit bypassing means for the expansion valve or capillary tube
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/05—Compression system with heat exchange between particular parts of the system
    • F25B2400/053—Compression system with heat exchange between particular parts of the system between the storage receiver and another part of the system
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/16—Receivers
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/23—Separators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/23—High amount of refrigerant in the system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/24—Low amount of refrigerant in the system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/05—Refrigerant levels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2509—Economiser valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2519—On-off valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/04—Refrigerant level
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/195—Pressures of the condenser

Definitions

  • the present invention relates to a refrigeration cycle apparatus.
  • Patent Document 1 discloses a bypass that guides at least a part of the liquid refrigerant stored in the refrigerant container to the suction side of the compressor via an expansion valve and a refrigerant heat exchanger.
  • Patent Document 2 discloses a bypass that guides at least a part of the liquid refrigerant stored in the refrigerant container to the suction side of the compressor via an expansion valve and a refrigerant heat exchanger.
  • a refrigeration cycle apparatus having a circuit is disclosed.
  • the present invention has been made to solve the above-described problems, and an object thereof is to suppress a decrease in efficiency of the refrigeration cycle apparatus.
  • the refrigerant circulates in the order of the compressor, the first heat exchanger, the first expansion valve, the refrigerant container, the second expansion valve, and the second heat exchanger.
  • the refrigeration cycle apparatus includes a third expansion valve and a specific flow path.
  • the specific channel communicates the third expansion valve and the refrigerant container.
  • the third expansion valve communicates with the suction port of the compressor via the refrigerant container.
  • the refrigerant amount per unit time passing through the specific flow path when the specific condition is satisfied is larger than the refrigerant amount per unit time passing through the specific flow path when the specific condition is not satisfied.
  • the specific condition is a condition that the amount of refrigerant in the refrigerant container is smaller than the reference amount.
  • the refrigerant circulates in the order of the compressor, the first heat exchanger, the first expansion valve, the refrigerant container, the second expansion valve, and the second heat exchanger.
  • the refrigeration cycle apparatus includes a third expansion valve, a specific flow path, and a third heat exchanger.
  • the specific channel communicates the third expansion valve and the refrigerant container.
  • the third heat exchanger is connected between the third expansion valve and the suction port of the compressor.
  • the third heat exchanger is disposed in the refrigerant container.
  • the specific condition is a condition that the amount of refrigerant in the refrigerant container is larger than the reference amount.
  • the heat exchange efficiency of the third heat exchanger when the specific condition is satisfied is smaller than the heat exchange efficiency when the refrigerant amount in the refrigerant container is the reference amount.
  • the specific condition is a condition that the amount of refrigerant in the refrigerant container is smaller than the reference amount, and passes through the specific flow path when the specific condition is satisfied. Since the refrigerant amount per unit time is larger than the refrigerant amount per unit time passing through the specific flow path when the specific condition is not satisfied, it is possible to suppress a decrease in efficiency of the refrigeration cycle apparatus.
  • the specific condition is a condition that the amount of refrigerant in the refrigerant container is larger than the reference amount, and the third heat exchange when the specific condition is satisfied.
  • the heat exchange efficiency of the container is smaller than the heat exchange efficiency when the amount of refrigerant in the refrigerant container is the reference amount, and when the specific condition is satisfied, the amount of refrigerant flowing into the refrigerant container flows out of the refrigerant container.
  • FIG. 2 is a functional block diagram showing a configuration of a refrigeration cycle apparatus according to Embodiment 1.
  • FIG. It is a figure which shows the flow of a process of expansion valve control performed by the control apparatus of FIG. It is a flowchart which shows the flow of the specific process of the refrigerant
  • coolant amount adjustment process of FIG. 6 is a functional block diagram showing a configuration of a refrigeration cycle apparatus according to Embodiment 2.
  • FIG. It is a flowchart which shows the flow of the refrigerant
  • FIG. 6 is a functional block diagram showing a configuration of a refrigeration cycle apparatus according to Embodiment 3.
  • FIG. It is a flowchart which shows the flow of the refrigerant
  • FIG. 10 is a functional block diagram showing a configuration of a refrigeration cycle apparatus according to Embodiment 4. It is a graph which shows the relationship between the height of the liquid level of the liquid refrigerant stored in the refrigerant container, and the heat exchange efficiency of the internal heat exchanger. It is a flowchart which shows the flow of the refrigerant
  • FIG. 10 is a functional block diagram showing a configuration of a refrigeration cycle apparatus according to Embodiment 5. It is a flowchart which shows the flow of the refrigerant
  • FIG. 1 is a functional block diagram showing the configuration of the refrigeration cycle apparatus 100 according to the first embodiment.
  • the refrigeration cycle apparatus 100 includes a compressor 1, a condenser 2 (first heat exchanger), an expansion valve 3 (first expansion valve), a refrigerant container 4, and an expansion valve 5. (Second expansion valve), evaporator 6 (second heat exchanger), pipe 71 (specific flow path), expansion valve 8 (third expansion valve), and internal heat exchanger 9 (third heat exchange) Device) and the control device 10.
  • the refrigerant circulates in the order of the compressor 1, the condenser 2, the expansion valve 3, the refrigerant container 4, the expansion valve 5, and the evaporator 6.
  • the refrigerant container 4 receives the refrigerant from the expansion valve 3 and stores the liquid refrigerant at the bottom.
  • the pipe 71 communicates the expansion valve 8 and the refrigerant container 4.
  • the internal heat exchanger 9 is connected between the expansion valve 8 and the suction port of the compressor 1 and is disposed in the refrigerant container 4.
  • the control device 10 controls the amount of refrigerant discharged from the compressor 1 per unit time by controlling the drive frequency of the compressor 1.
  • the control device 10 adjusts the opening degree of the expansion valves 3, 5, 8.
  • FIG. 2 is a diagram showing a flow of processing of the expansion valve control performed by the control device 10 of FIG.
  • the process shown in FIG. 2 is called by a main routine (not shown) that performs integrated control of the refrigeration cycle apparatus 100.
  • the step is simply referred to as S.
  • the control device 10 performs normal control on the expansion valves 3, 5, and 8 in S100, and advances the process to S200.
  • the normal control includes, for example, superheat control that maintains the superheat of the refrigerant flowing out of the evaporator 6 within a certain range.
  • the control device 10 performs a refrigerant amount adjustment process for adjusting the refrigerant amount in the refrigerant container 4, and then returns the process to the main routine.
  • the refrigeration cycle apparatus 100 when the amount of refrigerant in the refrigerant container 4 decreases and wet steam flows out from the refrigerant container 4, the amount of refrigerant on the low pressure side (portion from the expansion valve 5 to the suction port of the compressor 1) decreases. As a result, the pressure on the low-pressure side of the refrigeration cycle apparatus 100 decreases. Therefore, the differential pressure between the pressure on the high pressure side of the refrigeration cycle apparatus 100 (the portion from the discharge port of the compressor 1 to the expansion valve 3) and the pressure on the low pressure side increases, and the efficiency of the refrigeration cycle apparatus 100 can be reduced.
  • the opening of the expansion valve 5 When the opening of the expansion valve 5 is increased in order to increase the amount of refrigerant on the low pressure side by increasing the amount of refrigerant circulating in the refrigeration cycle apparatus 100 (circulating refrigerant amount), after the opening degree is fully opened, By controlling the opening degree of the expansion valve 5, the amount of refrigerant per unit time flowing out from the refrigerant container 4 to the expansion valve 5 cannot be increased. In such a case, the efficiency of the refrigeration cycle apparatus 100 cannot be suppressed by controlling the opening degree of the expansion valve 5. Further, when the opening degree of the expansion valve 5 is fully open, it is almost impossible to increase the amount of refrigerant flowing out of the refrigerant container 4, and therefore the decrease in the amount of refrigerant in the refrigerant container 4 is almost stopped.
  • the opening amount of the expansion valve 8 is increased to increase the amount of refrigerant per unit time passing through the pipe 71. Since the amount of refrigerant flowing out from the refrigerant container 4 to the expansion valve 8 increases, the amount of refrigerant is added to the amount of refrigerant sucked into the compressor 1. As a result, the amount of circulating refrigerant increases, and a decrease in efficiency of the refrigeration cycle apparatus 100 can be suppressed.
  • the opening degree of the expansion valve 5 is greater than or equal to the reference opening degree (for example, fully open). It is determined based on whether or not the condition is satisfied.
  • FIG. 3 is a flowchart showing a specific process flow of the refrigerant quantity adjustment process (S200) of FIG.
  • the control device 10 determines in S ⁇ b> 211 whether or not the opening degree of the expansion valve 5 is greater than or equal to the reference opening degree.
  • the control device 10 increases the opening degree of the expansion valve 8 by a certain amount and returns the process to the main routine in S212.
  • the opening degree of expansion valve 5 is less than the reference opening degree (NO in S211)
  • control device 10 returns the process to the main routine.
  • the fall of the efficiency of a refrigerating cycle apparatus can be controlled.
  • Embodiment 2 FIG. In Embodiment 1, the structure which increases the opening amount of a 3rd expansion valve and increases the refrigerant
  • FIG. 4 is a functional block diagram showing the configuration of the refrigeration cycle apparatus 200 according to the second embodiment.
  • the configuration of the refrigeration cycle apparatus 200 in FIG. 4 is a configuration in which an opening / closing unit 80 is added to the configuration of the refrigeration cycle apparatus 100 in FIG. Since the configuration other than these is the same, the description will not be repeated.
  • FIGS. 1 and 3 of the first embodiment are replaced with FIGS. 4 and 5, respectively.
  • the opening / closing part 80 is connected between the pipe 71 and the suction port of the compressor 1.
  • the control device 20 switches between opening and closing of the opening / closing unit 80.
  • the opening / closing part 80 is opened, the refrigerant flowing into the pipe 71 is bypassed to the suction port of the compressor 1 via the opening / closing part 80.
  • the expansion valve 8 can be downsized. By reducing the size of the expansion valve 8, the opening degree of the expansion valve 8 can be controlled in accordance with a relatively small resolution, so that the controllability of the expansion valve 8 can be improved.
  • FIG. 5 is a flowchart showing the flow of the refrigerant amount adjustment process performed by the control device 20 of FIG.
  • the control device 20 determines whether or not the opening degree of the expansion valve 5 is greater than or equal to the reference opening degree in S ⁇ b> 221.
  • the control device 20 opens the opening / closing part 80 and returns the process to the main routine in S222.
  • the control device 20 closes the opening / closing part 80 and returns the process to the main routine in S223.
  • FIG. 6 is a diagram illustrating an example of the configuration of the opening / closing unit 80 of FIG.
  • the opening / closing part 80 includes an opening / closing valve 81.
  • the on-off valve 81 is connected between the pipe 71 and the suction port of the compressor 1.
  • the control device 20 opens the on-off valve 81 in S222 of FIG. 5 and closes the on-off valve 81 in S223.
  • FIG. 7 is a diagram showing another example of the configuration of the opening / closing unit 80 of FIG.
  • the opening / closing part 80 includes a three-way valve 82.
  • the three-way valve 82 has ports P1 to P3 that communicate with each other.
  • the port P1 communicates with the expansion valve 8.
  • the port P2 communicates with the refrigerant container 4.
  • the port P3 communicates with the suction port of the compressor 1. Ports P1 and P2 are open.
  • the port P3 is switched between opening and closing.
  • the control device 20 opens the port P3 in S222 of FIG. 5, and closes the port P3 in S223.
  • Embodiment 3 FIG.
  • the configuration has been described in which the decrease in the efficiency of the refrigeration cycle apparatus due to the decrease in the amount of refrigerant in the refrigerant container and the outflow of wet steam from the refrigerant container has been described.
  • the third embodiment a configuration that suppresses a decrease in efficiency of the refrigeration cycle apparatus due to an increase in the amount of refrigerant in the refrigerant container and a decrease in heat exchange efficiency of the third heat exchanger will be described.
  • FIG. 8 is a functional block diagram showing the configuration of the refrigeration cycle apparatus 300 according to the third embodiment.
  • the configuration of the refrigeration cycle apparatus 300 is a configuration in which a pressure sensor 91 is added to the refrigeration cycle apparatus 100 of FIG. 1, and the control device 10 is replaced with the control device 30. Since the configuration other than these is the same, the description will not be repeated.
  • FIGS. 1 and 3 of the first embodiment are replaced with FIGS. 8 and 9, respectively.
  • the pressure sensor 91 detects the pressure of the refrigerant (condensation pressure) in the condenser 2 and outputs a detection signal representing the condensation pressure to the control device 30.
  • the control device 30 uses the detection signal from the pressure sensor 91 to control the opening degree of the expansion valve 3 to adjust the amount of refrigerant in the refrigerant container 4.
  • the liquid level of the liquid refrigerant stored in the refrigerant container 4 increases as the amount of refrigerant in the refrigerant container 4 increases.
  • the internal heat exchanger 9 is immersed in the liquid refrigerant, and the heat exchange efficiency of the internal heat exchanger 9 decreases.
  • the efficiency of the refrigeration cycle apparatus 300 can be reduced.
  • the smaller the amount of refrigerant in the condenser 2 the more the refrigerant distribution in the refrigeration cycle apparatus 300 is biased toward the low pressure side, so the amount of refrigerant in the refrigerant container 4 is larger. . Further, the smaller the amount of refrigerant in the condenser 2, the smaller the condensation pressure. Therefore, the smaller the condensation pressure, the greater the amount of refrigerant in the refrigerant container 4.
  • the refrigeration cycle apparatus 300 when the amount of refrigerant in the refrigerant container 4 is larger than the reference amount, the liquid level rises, and the heat exchange efficiency of the internal heat exchanger 9 decreases from a desired level.
  • the opening degree of the expansion valve 8 is decreased by a certain amount. Since the amount of refrigerant per unit time flowing from the expansion valve 3 into the refrigerant container 4 decreases and the liquid level of the liquid refrigerant stored in the refrigerant container 4 decreases, the heat exchange efficiency of the internal heat exchanger 9 is reduced. The decrease can be suppressed. As a result, a decrease in efficiency of the refrigeration cycle apparatus 300 can be suppressed.
  • the refrigerating-cycle apparatus 300 can be reduced in size.
  • whether the condition that the amount of refrigerant in the refrigerant container 4 is larger than the reference amount (specific condition) is satisfied, or whether the condition that the condensation pressure is smaller than the reference pressure is satisfied. Determine by.
  • FIG. 9 is a flowchart showing the flow of the refrigerant amount adjustment process performed by the control device 30 of FIG.
  • the control device 30 determines whether or not the condensation pressure is smaller than the reference pressure in S231. If the condensing pressure is smaller than the reference pressure (YES in S231), control device 30 decreases the opening of expansion valve 3 by a certain amount in S232, and returns the process to the main routine. If the condensing pressure is equal to or higher than the reference pressure (NO in S231), control device 30 increases the opening of expansion valve 3 by a certain amount in S233, and returns the process to the main routine.
  • the refrigeration cycle apparatus when the amount of refrigerant in the refrigerant container increases and the heat exchange efficiency of the third heat exchanger decreases from a desired level, A decrease in efficiency can be suppressed. Moreover, according to the refrigeration cycle apparatus according to Embodiment 3, the refrigeration cycle apparatus can be reduced in size.
  • Embodiment 4 FIG.
  • the case where the opening of the second expansion valve is used as an index indicating the amount of refrigerant in the refrigerant container 4 has been described
  • the case where the condensation pressure is used has been described
  • the case where the height of the liquid refrigerant in the refrigerant container 4 is used as an index indicating the amount of refrigerant in the refrigerant container 4 will be described.
  • FIG. 10 is a functional block diagram showing the configuration of the refrigeration cycle apparatus 400 according to the fourth embodiment.
  • the configuration of the refrigeration cycle apparatus 400 is a configuration in which a liquid level sensor 92 is added to the refrigeration cycle apparatus 100 of FIG. 1 and the control device 10 is replaced with the control device 40. Since the configuration other than these is the same, the description will not be repeated.
  • FIGS. 1 and 3 in the first embodiment are replaced with FIGS. 10 and 12, respectively.
  • the liquid level sensor 92 detects the liquid level of the liquid refrigerant in the refrigerant container 4, and outputs a detection signal indicating the liquid level to the control device 40.
  • the control device 30 uses the detection signal from the liquid level sensor 92 to control the opening degree of the expansion valve 8 to adjust the amount of refrigerant in the refrigerant container 4.
  • FIG. 11 is a graph showing the relationship between the height of the liquid refrigerant stored in the refrigerant container 4 and the heat exchange efficiency of the internal heat exchanger 9.
  • the liquid level height H1 is the maximum value of the liquid level that can maintain the differential pressure between the high pressure side pressure and the low pressure side pressure at an appropriate level. For example, when the condensation pressure is greater than the reference pressure.
  • the liquid level height H2 is smaller than the liquid level height H1, and is the liquid level height when the heat exchange efficiency of the internal heat exchanger 9 is maximized.
  • the end of the pipe 71 in the refrigerant container 4 approaches the liquid level as the liquid level stored in the refrigerant container 4 increases, and the dryness of the refrigerant flowing into the pipe 71 is increased. Decreases.
  • the liquid refrigerant flows into the pipe 71, and the heat exchange efficiency of the internal heat exchanger 9 increases as compared with the case where the wet steam flows into the pipe 71.
  • the internal heat exchanger 9 is immersed in the liquid refrigerant, and the internal heat exchanger 9 The heat exchange efficiency is reduced.
  • the refrigeration cycle apparatus 400 by controlling the opening of the expansion valve 8 so as to suppress the liquid level of the liquid refrigerant stored in the refrigerant container 4 from deviating from the range of H2 to H1. And the fall of the heat exchange efficiency of the internal heat exchanger 9 is suppressed. As a result, a decrease in efficiency of the refrigeration cycle apparatus 400 can be suppressed. Moreover, since the internal heat exchanger 9 can be reduced in size by suppressing the fall of heat exchange efficiency, the refrigerating-cycle apparatus 400 can be reduced in size.
  • the change in the liquid level of the liquid refrigerant stored in the refrigerant container 4 is within a certain range, the vibration of the liquid refrigerant in the refrigerant container 4 is suppressed, and the noise of the refrigeration cycle apparatus 400 is suppressed. . As a result, user comfort can be improved.
  • FIG. 12 is a flowchart showing the flow of the refrigerant amount adjustment process performed by the control device 40 of FIG.
  • the control device 40 determines in S241 whether or not the liquid level of the liquid refrigerant in the refrigerant container 4 is equal to or higher than the reference height H1 (first reference height).
  • the control device 40 increases the opening of the expansion valve 8 by a certain amount in S242. Return to main routine.
  • the controller 40 determines in S243 that the liquid level of the liquid refrigerant in the refrigerant container 4 is high. It is determined whether or not the height is equal to or higher than a reference height H2 (second reference height). When the liquid level of the liquid refrigerant in the refrigerant container 4 is equal to or higher than the reference height H2 (YES in S243), the control device 40 reduces the opening of the expansion valve 8 by a certain amount in S244. Return to main routine. When the liquid level of the liquid refrigerant in the refrigerant container 4 is less than the reference height H2 (NO in S243), the controller 40 increases the opening of the expansion valve 8 by a certain amount in S245 and performs processing. Return to main routine.
  • the refrigeration cycle apparatus As described above, according to the refrigeration cycle apparatus according to Embodiment 4, a decrease in the efficiency of the refrigeration cycle apparatus can be suppressed. Moreover, according to the refrigeration cycle apparatus according to Embodiment 4, the refrigeration cycle apparatus can be reduced in size, and noise can be suppressed to improve user comfort.
  • Embodiment 5 FIG.
  • coolant amount per unit time which passes a specific flow path was demonstrated.
  • the refrigerant per unit time passing through the specific flow path is bypassed from the specific flow path to the suction port of the compressor. A configuration for increasing the amount will be described.
  • FIG. 13 is a functional block diagram showing the configuration of the refrigeration cycle apparatus 500 according to the fifth embodiment.
  • the configuration of the refrigeration cycle apparatus 500 is a configuration in which an opening / closing part 80A is added to the refrigeration cycle apparatus 400 of FIG. Since the configuration other than these is the same, the description will not be repeated.
  • FIGS. 10 and 12 of the fourth embodiment are replaced with FIGS. 13 and 14, respectively.
  • the opening / closing part 80 ⁇ / b> A is connected between the pipe 71 and the suction port of the compressor 1.
  • the control device 50 switches between opening and closing of the opening / closing part 80A.
  • the specific configuration of the opening / closing part 80A is the same as that of the opening / closing part 80 of FIG. 6 or FIG.
  • the expansion valve 8 can be downsized. By reducing the size of the expansion valve 8, the opening degree of the expansion valve 8 can be controlled in accordance with a relatively small resolution, so that the controllability of the expansion valve 8 can be improved.
  • FIG. 14 is a flowchart showing the flow of the refrigerant amount adjustment process performed by the control device 50 of FIG.
  • the control device 50 determines whether or not the liquid level of the liquid refrigerant in the refrigerant container 4 is equal to or higher than the reference height H1.
  • the controller 50 increases the opening of the expansion valve 8 by a certain amount in S252.
  • the process proceeds to S253.
  • the control device 50 closes the opening / closing part 80A and returns it to the main routine.
  • the controller 50 determines in S254 that the liquid level of the liquid refrigerant in the refrigerant container 4 is high. It is determined whether the height is equal to or higher than the reference height H2.
  • the controller 50 reduces the opening of the expansion valve 8 by a certain amount in S255. Proceed to S256.
  • the control device 50 closes the opening / closing part 80A and returns the process to the main routine. If the liquid level of the liquid refrigerant in the refrigerant container 4 is less than the reference height H2 (NO in S254), the control device 50 opens the opening / closing part 80A and returns the process to the main routine in S257.

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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

Dans la présente invention, un fluide frigorigène circule dans un dispositif à cycle frigorifique (100) dans cet ordre : un compresseur (1), un premier échangeur de chaleur (2), un premier détendeur (3), un récipient de fluide frigorigène (4), un second détendeur (5), et un second échangeur de chaleur (6). Le dispositif à cycle frigorifique (100) comprend un troisième détendeur (8) et un trajet d'écoulement spécifiée (71). Le trajet d'écoulement spécifié (71) fait communiquer le troisième détendeur (8) et le récipient de fluide frigorigène (4). Le troisième détendeur (8) communique avec un orifice d'aspiration du compresseur (1) à travers le récipient de fluide frigorigène (4). La quantité de fluide frigorigène par unité de temps passant à travers le trajet d'écoulement spécifié (71) lorsqu'une condition spécifiée est satisfaite est supérieure à la quantité de fluide frigorigène par unité de temps passant à travers le trajet d'écoulement spécifié (71) lorsque la condition spécifiée n'est pas satisfaite. La condition spécifiée est que la quantité de fluide frigorigène à l'intérieur du récipient de fluide frigorigène (4) soit inférieure à une quantité de référence.
PCT/JP2018/022956 2018-06-15 2018-06-15 Dispositif à cycle frigorifique WO2019239587A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201880094106.9A CN112219074B9 (zh) 2018-06-15 2018-06-15 冷冻循环装置
JP2020525064A JP6925528B2 (ja) 2018-06-15 2018-06-15 冷凍サイクル装置
EP18922598.0A EP3809064A4 (fr) 2018-06-15 2018-06-15 Dispositif à cycle frigorifique
PCT/JP2018/022956 WO2019239587A1 (fr) 2018-06-15 2018-06-15 Dispositif à cycle frigorifique

Applications Claiming Priority (1)

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PCT/JP2018/022956 WO2019239587A1 (fr) 2018-06-15 2018-06-15 Dispositif à cycle frigorifique

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JPS5544178U (fr) * 1978-09-18 1980-03-22
US20090019878A1 (en) * 2005-02-18 2009-01-22 Gupte Neelkanth S Refrigeration circuit with improved liquid/vapour receiver
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EP2679930A4 (fr) * 2011-02-22 2015-04-29 Hitachi Ltd Appareil à cycle de réfrigération
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JP6091399B2 (ja) * 2013-10-17 2017-03-08 三菱電機株式会社 空気調和装置
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JPS5544178U (fr) * 1978-09-18 1980-03-22
US20090019878A1 (en) * 2005-02-18 2009-01-22 Gupte Neelkanth S Refrigeration circuit with improved liquid/vapour receiver
US20130145791A1 (en) * 2011-06-16 2013-06-13 Hill Phoenix, Inc. Refrigeration system
WO2015198475A1 (fr) * 2014-06-27 2015-12-30 三菱電機株式会社 Dispositif à cycle frigorifique
JP5865561B1 (ja) 2014-06-27 2016-02-17 三菱電機株式会社 冷凍サイクル装置

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CN112611121A (zh) * 2020-12-23 2021-04-06 青岛海信日立空调系统有限公司 一种制冷系统和两级节流阀的控制方法
CN112611121B (zh) * 2020-12-23 2023-09-05 青岛海信日立空调系统有限公司 一种制冷系统和两级节流阀的控制方法

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CN112219074B9 (zh) 2023-01-20
EP3809064A1 (fr) 2021-04-21
JPWO2019239587A1 (ja) 2021-03-11
CN112219074B (zh) 2022-12-06
EP3809064A4 (fr) 2021-09-22
CN112219074A (zh) 2021-01-12
JP6925528B2 (ja) 2021-08-25

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