WO2021140566A1 - 冷凍サイクル装置 - Google Patents

冷凍サイクル装置 Download PDF

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Publication number
WO2021140566A1
WO2021140566A1 PCT/JP2020/000169 JP2020000169W WO2021140566A1 WO 2021140566 A1 WO2021140566 A1 WO 2021140566A1 JP 2020000169 W JP2020000169 W JP 2020000169W WO 2021140566 A1 WO2021140566 A1 WO 2021140566A1
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WO
WIPO (PCT)
Prior art keywords
oil
refrigerant
injection
injection circuit
circuit
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/JP2020/000169
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English (en)
French (fr)
Japanese (ja)
Inventor
卓美 森下
隼平 溝畑
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 JP2021569632A priority Critical patent/JP7292428B2/ja
Priority to PCT/JP2020/000169 priority patent/WO2021140566A1/ja
Priority to CN202080089318.5A priority patent/CN114846283B/zh
Publication of WO2021140566A1 publication Critical patent/WO2021140566A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type

Definitions

  • the present disclosure relates to a refrigeration cycle apparatus including a refrigerant circuit having an oil injection circuit.
  • a refrigerating cycle apparatus is known to be provided with a scroll compressor having an injection flow path for supplying oil to a compression chamber in the middle of compression.
  • a part of the oil separated by the oil separator provided on the discharge side of the scroll compressor is passed through an oil supply pipe and an injection pipe. It is configured to supply to the compression chamber from the injection port.
  • the compression chamber is formed by combining the fixed spiral teeth of the fixed scroll and the swinging spiral teeth of the swing scroll so as to mesh with each other.
  • the present disclosure has been made to solve the above problems, and an object of the present disclosure is to provide a refrigeration cycle device capable of controlling the amount of oil injected into the compression chamber.
  • the refrigeration cycle apparatus includes a compressor having a compression chamber for compressing a refrigerant and an injection pipe connected to the compression chamber, an oil separator, a first heat exchanger, a decompression device, and a second.
  • the heat exchanger is connected in order by a pipe, and the main circuit in which the refrigerant circulates, the oil injection circuit branched from the oil separator and connected to the injection pipe of the scroll compressor, and the refrigeration cycle device are operated.
  • a control device for controlling the oil injection circuit is provided, and the oil injection circuit is provided with a first control valve that is controlled by the control device and adjusts the flow rate of oil flowing through the oil injection circuit.
  • the oil injection circuit is provided with the first control valve for adjusting the flow rate of the oil, the flow rate and timing of the oil injected into the compression chamber can be controlled. Therefore, since the amount of oil supplied to the compression chamber can be adjusted in a state where the operating frequency of the scroll compressor is in the high speed range, damage to the spiral teeth due to oil compression can be suppressed, and the amount of discharged oil circulation can be reduced. It is possible to suppress the deterioration of performance due to the increase.
  • FIG. FIG. 5 is a schematic vertical sectional view showing a scroll compressor which is a component of the refrigeration cycle apparatus according to the first embodiment. It is a refrigerant circuit diagram of the refrigerating cycle apparatus which concerns on Embodiment 2. FIG. It is a refrigerant circuit diagram of the refrigerating cycle apparatus which concerns on Embodiment 3. FIG. It is a refrigerant circuit diagram of the refrigerating cycle apparatus which concerns on Embodiment 4. FIG. It is a refrigerant circuit diagram of the refrigerating cycle apparatus which concerns on Embodiment 5.
  • FIG. 1 is a refrigerant circuit diagram of the refrigeration cycle device according to the first embodiment.
  • FIG. 2 is a schematic vertical sectional view showing a scroll compressor which is a component of the refrigeration cycle apparatus according to the first embodiment.
  • the refrigerating cycle device according to the first embodiment is used for, for example, an air conditioner, a refrigerating device, a refrigerator, a freezer, a vending machine, a hot water supply device, or the like.
  • the refrigeration cycle apparatus includes a refrigerant circuit 100 having a main circuit A, a refrigerant injection circuit B, and an oil injection circuit C.
  • the main circuit A includes a scroll compressor 200 having a compression chamber 30 for compressing the refrigerant and an injection pipe 12 connected to the compression chamber 30, an oil separator 201, and a first heat.
  • the exchanger 202, the decompression device 203, and the second heat exchanger 204 are connected in order by piping to circulate the refrigerant.
  • the refrigerant injection circuit B has a configuration in which the refrigerant injection circuit B is branched from the pipe between the first heat exchanger 202 and the decompression device 203 and connected to the injection pipe 12 of the scroll compressor 200. ..
  • the refrigerant injection circuit B is provided with a second control valve 207 that adjusts the flow rate of the refrigerant flowing through the refrigerant injection circuit B, and a second solenoid valve 208 that opens and closes the refrigerant injection circuit B.
  • the second control valve 207 is composed of, for example, an electronic expansion valve or the like.
  • the refrigerant circuit 100 may omit the second solenoid valve 208 as long as the second control valve 207 can adjust the opening degree from 0% to 100%.
  • the oil injection circuit C is branched from the oil separator 201, connected to the second heat exchanger 204, and then connected to the refrigerant injection circuit B, and the refrigerant injection circuit B is connected to the refrigerant injection circuit B. It is configured to be connected to the injection pipe 12 of the scroll compressor 200 via.
  • the oil injection circuit C includes a first control valve 205 for adjusting the flow rate of oil flowing through the oil injection circuit C between the second heat exchanger 204 and the connection point of the refrigerant injection circuit B, and an oil injection circuit C.
  • a first solenoid valve 206 that opens and closes is provided.
  • the first control valve 205 is composed of, for example, an electronic expansion valve or the like.
  • the refrigerant circuit 100 may omit the first solenoid valve 206 as long as the first control valve 205 can adjust the opening degree from 0% to 100%.
  • the scroll compressor 200 sucks in the refrigerant circulating in the refrigerant circuit 100, compresses it, and discharges it in a high temperature and high pressure state.
  • the scroll compressor 200 includes a shell 1 forming an outer shell, a main frame 2 fixed to the inner wall surface of the shell 1, a compression mechanism unit 3 having a compression chamber 30 for compressing a refrigerant, and a compression mechanism unit 3. It includes a drive mechanism unit 6 that drives the compression mechanism unit 3, and a main shaft 7 that connects the compression mechanism unit 3 and the drive mechanism unit 6.
  • Shell 1 is composed of a pressure vessel.
  • the shell 1 is connected to a suction pipe 10 for taking in the refrigerant from the outside into the shell 1 and a discharge pipe 11 for discharging the compressed refrigerant from the shell 1 to the outside.
  • the pressure of the refrigerant sucked from the suction pipe 10 is low pressure Ps.
  • the pressure of the refrigerant discharged from the discharge pipe 11 is high pressure Pd.
  • an oil reservoir 14 for storing refrigerating machine oil is provided at the inner bottom of the shell 1. Refrigerating machine oil is supplied to the compression mechanism unit 3, each bearing, and the like through the oil supply flow path 70 formed in the spindle 7.
  • the compression mechanism unit 3 includes a fixed scroll 4 and a swing scroll 5.
  • the fixed scroll 4 is fixed to the main frame 2 fixed to the inner wall surface of the shell 1 by bolts or the like.
  • the fixed scroll 4 has a fixed base plate 40 and fixed spiral teeth 41 which are involute curved protrusions provided on the lower surface of the fixed base plate 40.
  • the oscillating scroll 5 has a oscillating base plate 50 and oscillating spiral teeth 51 which are involute curved protrusions provided on the upper surface of the oscillating base plate 50.
  • the fixed scroll 4 and the swing scroll 5 are arranged in the shell 1 in a symmetrical spiral shape in which the fixed spiral tooth 41 and the swing spiral tooth 51 are meshed with each other in opposite phases with respect to the rotation center of the spindle 7. ..
  • the fixed scroll 4 and the swinging scroll 5 are combined in the compression mechanism portion 3 so that the fixed spiral tooth 41 and the swinging spiral tooth 51 mesh with each other, the fixed scroll tooth 41 and the swinging spiral tooth 51 are formed between the fixed scroll tooth 41 and the swinging spiral tooth 51.
  • a compression chamber 30 is formed. The volume of the compression chamber 30 decreases from the outer side to the inner side in the radial direction as the spindle 7 rotates.
  • a discharge port 42 for discharging the refrigerant compressed in the compression chamber 30 and having a high temperature and high pressure is formed.
  • a back plate 15 having a discharge flow path 15a communicating with the discharge port 42 is fixedly provided on the upper surface of the fixed scroll 4 by bolting or the like.
  • the back plate 15 is provided with a discharge valve 16 screwed to open and close the discharge flow path 15a according to the pressure of the refrigerant.
  • the discharge valve 16 opens the discharge flow path 15a when the refrigerant in the compression chamber 30 communicating with the discharge port 42 reaches a predetermined pressure.
  • the compressed high-temperature and high-pressure refrigerant is discharged from the discharge port 42 into the discharge space 13 above the fixed scroll 4, passes through the discharge pipe 11, and is discharged to the outside of the shell 1.
  • the fixed base plate 40 is formed with an injection flow path 43 communicating with the compression chamber 30.
  • the injection flow path 43 is formed at a position communicating with the compression chamber 30 at the initial stage or the intermediate stage of the compression stroke during one rotation of the main shaft 7.
  • the pressure in the compression chamber 30 at this time is an intermediate pressure between the low pressure Ps and the high pressure Pd.
  • the back plate 15 is formed with a communication flow path 15b that communicates with the injection flow path 43.
  • An injection pipe 12 communicating with the communication flow path 15b from the outside of the shell 1 is fixed to the back plate 15 by a connecting member 12a. That is, the injection flow path 43 is connected to the injection pipe 12 via the communication flow path 15b. Refrigerant and oil are supplied from the injection pipe 12 to the compression chamber 30 through the communication flow path 15b and the injection flow path 43.
  • the swing scroll 5 revolves with respect to the fixed scroll 4 without rotating with respect to the fixed scroll 4 by the oldam joint 8 for preventing the rotation.
  • the surface of the rocking base plate 50 on the side where the rocking spiral teeth 51 are not formed acts as a rocking scroll thrust bearing surface.
  • a hollow cylindrical boss portion 52 is provided at the center of the swing scroll thrust bearing surface.
  • An eccentric shaft portion 71 provided at one end of the main shaft 7 is rotatably connected to the boss portion 52.
  • the oscillating scroll 5 revolves on the thrust sliding surface of the main frame 2 by rotating the eccentric shaft portion 71 of the main shaft 7 inserted into the boss portion 52.
  • the drive mechanism unit 6 is provided below the main frame 2 and rotationally drives the swing scroll 5 connected via the spindle 7 with respect to the fixed scroll 4.
  • the drive mechanism unit 6 is composed of an annular stator 60 fixed to the inner wall surface of the shell 1 by shrink fitting or the like, and a rotor 61 rotatably provided facing the inner surface of the stator 60. ing.
  • the stator 60 has, for example, a structure in which windings are wound around an iron core formed by laminating a plurality of electromagnetic steel sheets via an insulating layer.
  • the rotor 61 has a structure in which a permanent magnet is built in an iron core formed by laminating a plurality of electromagnetic steel sheets, and has a through hole penetrating in the vertical direction in the center.
  • the spindle 7 is fixed to the through hole of the rotor 61.
  • the rotor 61 rotates when the stator 60 is energized, and the spindle 7 rotates with the rotation of the rotor 61 to the compression mechanism unit 3 connected via the spindle 7. It is a configuration in which the driving force is transmitted.
  • the oil separator 201 is connected to the discharge side of the scroll compressor 200 and separates the oil contained in the refrigerant gas discharged from the scroll compressor 200.
  • the oil separated from the refrigerant gas by the oil separator 201 is returned to the suction side of the scroll compressor 200 via the oil injection circuit C.
  • the oil not separated by the oil separator 201 flows through the first heat exchanger 202, the decompression device 203, and the second heat exchanger 204 in this order, and is returned to the suction side of the scroll compressor 200.
  • the first heat exchanger 202 in the first embodiment functions as a condenser.
  • the first heat exchanger 202 exchanges heat between the refrigerant discharged from the scroll compressor 200 and a heat medium such as air or water to condense and liquefy the refrigerant.
  • the inflow side of the first heat exchanger 202 is connected to the oil separator 201, and the outflow side is connected to the decompression device 203.
  • the decompression device 203 decompresses and expands the supplied refrigerant.
  • the pressure reducing device 203 is composed of, for example, an expansion valve, a capillary tube, or the like.
  • the second heat exchanger 204 in the first embodiment functions as an evaporator.
  • the second heat exchanger 204 exchanges heat between the air sucked from the intake port and the refrigerant, and a low-pressure refrigerant liquid (or gas-liquid two-phase refrigerant) flows in and exchanges heat with the air. Evaporates the refrigerant.
  • the inflow side of the second heat exchanger 204 is connected to the decompression device 203, and the outflow side is connected to the scroll compressor 200.
  • the control device 300 controls the entire refrigeration cycle device.
  • the control device 300 controls, for example, the rotation speed of the scroll compressor 200, the opening degree control of the expansion valves constituting the pressure reducing device 203, the control of the first control valve 205 and the second control valve 207, the first solenoid valve 206 and the second.
  • the solenoid valve 208 is opened and closed.
  • the control device 300 is composed of a microcomputer or the like, and includes a CPU, a RAM, a ROM, and the like.
  • the refrigerant discharged from the scroll compressor 200 is separated into the refrigerant and the oil by the oil separator 201, and then cooled by the first heat exchanger 202.
  • the refrigerant cooled by the first heat exchanger 202 is decompressed by the decompression device 203 and then heated by the second heat exchanger 204 to become a refrigerant gas.
  • the refrigerant gas flowing out of the second heat exchanger 204 returns to the scroll compressor 200.
  • the control device 300 closes the first control valve 205 and the first solenoid valve 206 and opens the second control valve 207 and the second solenoid valve 208 during the refrigerant injection operation.
  • the injection refrigerant which is a part of the high-pressure liquid refrigerant cooled by the first heat exchanger 202, flows into the refrigerant injection circuit B and is depressurized by the second control valve 207 to become a liquid or two-phase state. , It flows into the injection pipe 12 of the scroll compressor 200 via the second solenoid valve 208.
  • the injection refrigerant that has flowed into the injection pipe 12 flows into the compression chamber 30 in the middle of compression through the communication flow path 15b and the injection flow path 43.
  • the first control valve 205 and the first solenoid valve 206 of the oil injection circuit C are closed, oil does not flow into the injection pipe 12.
  • control device 300 opens the first control valve 205 and the first solenoid valve 206 and closes the second control valve 207 and the second solenoid valve 208 during the oil injection operation.
  • a part of the oil discharged from the scroll compressor 200 and separated into the refrigerant and the oil by the oil separator 201 flows into the oil injection circuit C and is cooled by the second heat exchanger 204 at a high pressure. After it becomes oil, it is depressurized and the flow rate is adjusted by the second control valve 207, connected to the pipe of the refrigerant injection circuit B, and flows into the injection pipe 12 of the scroll compressor 200.
  • the injection oil that has flowed into the injection pipe 12 flows into the compression chamber 30 in the middle of compression through the communication flow path 15b and the injection flow path 43. At this time, since the second control valve 207 and the second solenoid valve 208 of the refrigerant injection circuit B are closed, the refrigerant does not flow into the injection pipe 12.
  • the internal pressure P of the compression chamber 30 when the injection flow path 43 communicates with the compression chamber 30 in the middle of compression is lower than the internal pressure Pm in the refrigerant injection circuit B and the oil injection circuit C.
  • the injection flow path 43 is formed at a position communicating with the compression chamber 30 at the initial stage or the intermediate stage of the compression stroke during one rotation of the main shaft 7.
  • the injection refrigerant or the injection oil is introduced from the injection pipe 12 into the communication flow path 15b and the injection flow path 43. It flows in and is supplied to the compression chamber 30.
  • the gas refrigerant in the process of compression is cooled.
  • oil is supplied into the compression chamber 30, and an oil seal is performed between the fixed spiral tooth 41 and the swing spiral tooth 51.
  • the scroll compressor 200 having the compression chamber 30 for compressing the refrigerant and the injection pipe 12 connected to the compression chamber 30, the oil separator 201, and the first.
  • the heat exchanger 202, the decompression device 203, and the second heat exchanger 204 are connected in order by piping, and the main circuit A in which the refrigerant circulates and the injection piping of the scroll compressor 200 branching from the oil separator 201.
  • It includes an oil injection circuit C connected to 12 and a control device 300 for operating and controlling the refrigeration cycle device.
  • the oil injection circuit C is provided with a first control valve 205 which is controlled by the control device 300 and adjusts the flow rate of the oil flowing through the oil injection circuit C.
  • the oil injection circuit C is provided with the first control valve 205 for adjusting the flow rate of the oil, the flow rate and timing of the oil injected into the compression chamber 30 can be controlled. .. Therefore, since the amount of oil supplied to the compression chamber 30 can be adjusted in a state where the operating frequency of the scroll compressor 200 is in the high speed range, the fixed spiral tooth 41 and the swing spiral tooth 51 are damaged by oil compression. Can be suppressed, and performance deterioration due to an increase in the circulation amount of discharged oil can be suppressed.
  • the oil injection circuit C is branched from the oil separator 201 and connected to the injection pipe 12 of the scroll compressor 200 via the second heat exchanger 204. Therefore, in the refrigeration cycle apparatus of the first embodiment, the oil separated by the oil separator 201 can be cooled by the second heat exchanger 204 and then injected into the compression chamber 30, so that the oil in the compression chamber 30 can be injected.
  • the refrigerant gas can be cooled and the discharge temperature can be suppressed. Further, by cooling the oil, highly viscous oil can be injected into the compression chamber 30, so that the sealing property between the tooth tips of the fixed spiral tooth 41 and the swinging spiral tooth 51 is improved, and the leakage loss of the refrigerant is improved. Can be reduced and performance can be improved.
  • the refrigeration cycle device of the first embodiment further includes a refrigerant injection circuit B branched from the pipe between the first heat exchanger 202 and the decompression device 203 and connected to the injection pipe 12 of the scroll compressor 200. ing.
  • the refrigerant injection circuit B is provided with a second control valve 207 which is controlled by the control device 300 and controls the flow rate of the refrigerant flowing through the refrigerant injection circuit B. Therefore, since the refrigerating cycle apparatus of the first embodiment can adjust the flow rate and timing of the refrigerant injected into the compression chamber 30, an appropriate amount of refrigerant can be injected into the compression chamber 30, and the operating range of the scroll compressor 200 can be adjusted. And the frequency range used can be expanded.
  • control device 300 controls to close the first control valve 205 and open the second control valve 207 during the refrigerant injection operation, and opens the first control valve 205 during the oil injection operation to open the second control valve 205. Control is performed to close the control valve 207. Therefore, in the refrigeration cycle apparatus of the first embodiment, the oil injection circuit C is closed during the high-speed operation of the compressor, so that the circulation amount of the discharged oil can be suppressed and the performance can be improved, and the low-speed operation can be achieved. By sometimes performing oil injection, oil can be supplied between the fixed spiral tooth 41 and the swinging spiral tooth 51, and the fixed spiral tooth 41 and the swinging spiral tooth 51 are prevented from being worn to improve reliability. be able to.
  • FIG. 3 is a refrigerant circuit diagram of the refrigeration cycle device according to the second embodiment.
  • the same configurations as those of the refrigeration cycle apparatus described in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.
  • the refrigerating cycle apparatus includes a refrigerant circuit 101 having a main circuit A, a refrigerant injection circuit B, and an oil injection circuit C.
  • the scroll compressor 200 In the main circuit A, the scroll compressor 200, the oil separator 201, the first heat exchanger 202, the decompression device 203, and the second heat exchanger 204 are connected in order by piping, and the refrigerant circulates. Is.
  • the first heat exchanger 202 in the second embodiment functions as a condenser. Further, the second heat exchanger 204 in the second embodiment functions as an evaporator.
  • the refrigerant injection circuit B has a configuration in which it branches from the pipe between the first heat exchanger 202 and the decompression device 203 and is connected to the injection pipe 12 of the scroll compressor 200.
  • the refrigerant injection circuit B is provided with a second control valve 207 that adjusts the flow rate of oil flowing through the oil injection circuit C.
  • the second control valve 207 has a configuration capable of adjusting the opening degree from 0% to 100%.
  • the refrigerant injection circuit B may be provided with a second solenoid valve 208 for opening and closing the refrigerant injection circuit B.
  • the oil injection circuit C branches from the oil separator 201, is connected between the second control valve 207 in the refrigerant injection circuit B and the scroll compressor 200, and injects the scroll compressor 200 via the refrigerant injection circuit B. It is configured to be connected to the pipe 12.
  • the oil injection circuit C is provided with a first control valve 205 that adjusts the flow rate of oil flowing through the oil injection circuit C.
  • the first control valve 205 has a configuration capable of adjusting the opening degree from 0% to 100%.
  • the oil injection circuit C may be provided with a first solenoid valve 206 for opening and closing the oil injection circuit C.
  • the oil injection circuit C is provided with the first control valve 205 for adjusting the oil flow rate, the flow rate and timing of the oil injected into the compression chamber 30 are provided. Can be controlled. Therefore, since the amount of oil supplied to the compression chamber 30 can be adjusted in a state where the operating frequency of the scroll compressor 200 is in the high speed range, the fixed spiral tooth 41 and the swing spiral tooth 51 are damaged by oil compression. Can be suppressed, and performance deterioration due to an increase in the circulation amount of discharged oil can be suppressed.
  • the refrigerating cycle apparatus of the second embodiment can adjust the flow rate and timing of the refrigerant injected into the compression chamber 30, an appropriate amount of refrigerant can be injected into the compression chamber 30, and the operating range of the scroll compressor 200 can be adjusted. And the frequency range used can be expanded.
  • the oil injection circuit C is closed during the high-speed operation of the compressor, so that the circulation amount of the discharged oil can be suppressed and the performance can be improved, and the low-speed operation can be achieved.
  • oil can be supplied between the fixed spiral tooth 41 and the swinging spiral tooth 51, and the fixed spiral tooth 41 and the swinging spiral tooth 51 are prevented from being worn to improve reliability. be able to.
  • FIG. 4 is a refrigerant circuit diagram of the refrigeration cycle device according to the third embodiment.
  • the same configurations as those of the refrigeration cycle apparatus described in the first and second embodiments are designated by the same reference numerals, and the description thereof will be omitted as appropriate.
  • the refrigerant circuit 102 of the refrigerating cycle apparatus is provided with an oil return pipe 209 that bypasses the oil separator 201 and the suction side of the scroll compressor 200. It is a feature.
  • the oil return pipe 209 is provided with a third control valve 210 which is controlled by the control device 300 and adjusts the flow rate of the oil flowing through the oil return pipe 209.
  • the third control valve 210 is composed of an electronic expansion valve or the like capable of adjusting the opening degree from 0% to 100%.
  • the oil return pipe 209 may be provided with a solenoid valve for opening and closing the oil return pipe 209.
  • the scroll compressor 200 has a sufficient amount of oil supplied to the compression mechanism unit 3 during high-speed operation. Therefore, the amount of oil supplied to the injection flow path 43 is reduced to zero or extremely small. However, if the scroll compressor 200 continues to operate at high speed, oil may accumulate inside the oil separator 201, while the oil in the scroll compressor 200 may be exhausted. Therefore, it is preferable to provide an oil return pipe 209 that bypasses the suction side of the oil separator 201 and the scroll compressor 200, as in the refrigeration cycle device of the third embodiment. Further, a third control valve 210 may be provided in the oil return pipe 209 to return oil to the suction side of the scroll compressor 200 according to the amount of oil in the oil separator 201.
  • the amount of oil in the oil separator 201 is obtained from the measured value of the amount of oil by the oil amount meter.
  • the amount of oil in the oil separator 201 may be obtained from the operating frequency of the scroll compressor 200 and its operating time. Further, the amount of oil in the oil separator 201 may be obtained by an estimated value calculated from the amount of oil returned to the scroll compressor 200 by the oil return pipe 209.
  • FIG. 5 is a refrigerant circuit diagram of the refrigeration cycle device according to the fourth embodiment.
  • the same configurations as those of the refrigeration cycle apparatus described in the first to third embodiments are designated by the same reference numerals, and the description thereof will be omitted as appropriate.
  • the refrigeration cycle device is, for example, an air conditioner capable of heating and cooling.
  • this refrigeration cycle apparatus includes a refrigerant circuit 103 having a main circuit A, a refrigerant injection circuit B, and an oil injection circuit C.
  • the main circuit A includes a scroll compressor 200, an oil separator 201, a flow path switching means 211, a first heat exchanger 202, a first decompression device 212, a second decompression device 213, and a second heat exchanger.
  • 204 and 204 are connected in order by piping, and the refrigerant circulates.
  • the flow path switching means 211 is, for example, a four-way valve, and has a function of switching the flow path of the refrigerant, which is controlled by the control device 300. As shown by the solid line in FIG. 5, the flow path switching means 211 connects the discharge side of the scroll compressor 200 and the first heat exchanger 202, and connects the suction side of the scroll compressor 200 and the first heat exchanger 202 during the cooling operation. 2 The refrigerant flow path is switched so as to connect to the heat exchanger 204. During the heating operation, the flow path switching means 211 connects the discharge side of the scroll compressor 200 and the second heat exchanger 204, and connects the suction side of the scroll compressor 200 and the second heat exchanger 200, as shown by the broken line in FIG. 1 The refrigerant flow path is switched so as to connect to the heat exchanger 202.
  • the flow path switching means 211 may be configured by combining a two-way valve or a three-way valve.
  • the first heat exchanger 202 functions as a condenser during the cooling operation to liquefy the refrigerant, and functions as an evaporator during the heating operation to vaporize the refrigerant.
  • the second heat exchanger 204 functions as an evaporator during the cooling operation and as a condenser during the heating operation.
  • the first decompression device 212 and the second decompression device 213 are controlled by the control device 300 to decompress and expand the supplied refrigerant.
  • the first decompression device 212 and the second decompression device 213 are composed of, for example, an expansion valve or a capillary tube.
  • the refrigerant injection circuit B has a configuration in which the refrigerant injection circuit B is branched from the pipe between the first decompression device 212 and the second decompression device 213 and connected to the injection pipe 12 of the scroll compressor 200.
  • the refrigerant injection circuit B is provided with a second control valve 207 that adjusts the flow rate of the refrigerant flowing through the refrigerant injection circuit B.
  • the second control valve 207 has a configuration capable of adjusting the opening degree from 0% to 100%.
  • the refrigerant injection circuit B may be provided with a second solenoid valve 208 for opening and closing the refrigerant injection circuit B.
  • the oil injection circuit C branches from the oil separator 201, is connected between the second control valve 207 in the refrigerant injection circuit B and the scroll compressor 200, and injects the scroll compressor 200 via the refrigerant injection circuit B. It is configured to be connected to the pipe 12.
  • the oil injection circuit C is provided with a first control valve 205 that adjusts the flow rate of oil flowing through the oil injection circuit C.
  • the first control valve 205 has a configuration capable of adjusting the opening degree from 0% to 100%. As shown in the first embodiment, the oil injection circuit C and the first solenoid valve 206 for opening and closing the oil injection circuit C may be provided.
  • the refrigerant circuit 103 in the fourth embodiment is provided with an oil return pipe 209 that bypasses the oil separator 201 and the suction side of the scroll compressor 200.
  • the oil return pipe 209 is provided with a third control valve 210 which is controlled by the control device 300 and adjusts the flow rate of the oil flowing through the oil return pipe 209.
  • the third control valve 210 is composed of an electronic expansion valve or the like capable of adjusting the opening degree from 0% to 100%.
  • the oil return pipe 209 may be provided with a solenoid valve for opening and closing the oil return pipe 209.
  • the refrigerating cycle apparatus according to the fourth embodiment can also obtain the same effects as those described in the second and third embodiments.
  • FIG. 6 is a refrigerant circuit diagram of the refrigeration cycle device according to the fifth embodiment.
  • the same configurations as those of the refrigeration cycle apparatus described in the first to fourth embodiments are designated by the same reference numerals, and the description thereof will be omitted as appropriate.
  • the refrigerating cycle apparatus according to the fifth embodiment has a different configuration of the oil injection circuit C from the refrigerating cycle apparatus of the fourth embodiment described above. Therefore, in the fifth embodiment, only the configuration of the oil injection circuit C will be described, and the configuration of the fourth embodiment will be used for other configurations.
  • the oil injection circuit C in the fifth embodiment includes a first oil injection circuit C1 and a second oil injection circuit C2.
  • the first oil injection circuit C1 branches from the oil separator 201, is connected to the first heat exchanger 202, is connected to the refrigerant injection circuit B, and is connected to the refrigerant injection circuit B via the refrigerant injection circuit B.
  • the configuration is connected to the injection pipe 12 of the scroll compressor 200 shown in FIG.
  • a first control valve 205 controlled by a control device 300 between the oil separator 201 and the first heat exchanger 202 in the first oil injection circuit C1 and adjusting the flow rate of oil flowing through the first oil injection circuit C1.
  • the first control valve 205 is composed of an electronic expansion valve or the like capable of adjusting the opening degree from 0% to 100%.
  • the first oil injection circuit C1 may be provided with a solenoid valve for opening and closing the first oil injection circuit C1.
  • the second oil injection circuit C2 is branched from the oil separator 201, connected to the second heat exchanger 204, and then connected to the refrigerant injection circuit B, via the refrigerant injection circuit B.
  • the configuration is connected to the injection pipe 12 of the scroll compressor 200 shown in FIG.
  • a first control valve 205 which is controlled by a control device 300 and regulates the flow rate of oil flowing through the second oil injection circuit C2, between the oil separator 201 and the second heat exchanger 204 in the second oil injection circuit C2.
  • the first control valve 205 is composed of an electronic expansion valve or the like capable of adjusting the opening degree from 0% to 100%.
  • the second oil injection circuit C2 may be provided with a solenoid valve for opening and closing the second oil injection circuit C2.
  • the refrigerant circuit 104 of the fifth embodiment when the first heat exchanger 202 functions as an evaporator, oil is supplied from the injection pipe 12 to the compression chamber 30 through the first oil injection circuit C1, and the second heat exchanger When the 204 functions as an evaporator, oil is supplied from the injection pipe 12 to the compression chamber 30 through the second oil injection circuit C2.
  • the refrigeration cycle device has been described above based on the embodiment, the refrigeration cycle device is not limited to the configuration of the above-described embodiment.
  • the refrigeration cycle apparatus is not limited to the above-mentioned components, and may include other components or may omit some components.
  • the refrigerant injection circuit B does not necessarily have to be provided and may be omitted.
  • the oil separator 201 may be provided between the condenser and the decompression device, or between the decompression device and the branch point of the refrigerant injection circuit B. In this case, as the temperature of the refrigerant decreases due to the refrigeration cycle, the temperature of the oil can also decrease.
  • the height of the pressure is not particularly determined in relation to the absolute value, but is relatively determined in the state and operation of the system, the device, and the like.
  • the refrigeration cycle device includes a range of design changes and application variations normally performed by those skilled in the art, as long as the technical concept is not deviated.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
PCT/JP2020/000169 2020-01-07 2020-01-07 冷凍サイクル装置 Ceased WO2021140566A1 (ja)

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JP2021569632A JP7292428B2 (ja) 2020-01-07 2020-01-07 冷凍サイクル装置
PCT/JP2020/000169 WO2021140566A1 (ja) 2020-01-07 2020-01-07 冷凍サイクル装置
CN202080089318.5A CN114846283B (zh) 2020-01-07 2020-01-07 制冷循环装置

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Cited By (1)

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GB2615111A (en) * 2022-01-28 2023-08-02 Agilent Technologies Inc Cooling arrangements for analytical device

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WO2015173939A1 (ja) * 2014-05-15 2015-11-19 三菱電機株式会社 冷凍装置
JP6472510B2 (ja) * 2015-04-24 2019-02-20 三菱電機株式会社 冷凍空調装置
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JP2003148814A (ja) * 2001-11-15 2003-05-21 Matsushita Electric Ind Co Ltd 冷凍装置
JP2008170118A (ja) * 2007-01-15 2008-07-24 Mitsubishi Electric Corp ヒートポンプ式設備機器
WO2019021360A1 (ja) * 2017-07-25 2019-01-31 三菱電機株式会社 冷凍サイクル装置
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GB2615111A (en) * 2022-01-28 2023-08-02 Agilent Technologies Inc Cooling arrangements for analytical device
GB2615111B (en) * 2022-01-28 2024-07-03 Agilent Technologies Inc Cooling arrangements for analytical device

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CN114846283B (zh) 2024-01-16
CN114846283A (zh) 2022-08-02

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