WO2024127536A1 - 気液分離器、圧縮機、及び冷凍サイクル装置 - Google Patents

気液分離器、圧縮機、及び冷凍サイクル装置 Download PDF

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Publication number
WO2024127536A1
WO2024127536A1 PCT/JP2022/045953 JP2022045953W WO2024127536A1 WO 2024127536 A1 WO2024127536 A1 WO 2024127536A1 JP 2022045953 W JP2022045953 W JP 2022045953W WO 2024127536 A1 WO2024127536 A1 WO 2024127536A1
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WIPO (PCT)
Prior art keywords
gas
container
refrigerant
liquid separator
oil
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/JP2022/045953
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English (en)
French (fr)
Japanese (ja)
Inventor
良太 湯浅
宏樹 長澤
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2022/045953 priority Critical patent/WO2024127536A1/ja
Priority to JP2024564027A priority patent/JPWO2024127536A1/ja
Publication of WO2024127536A1 publication Critical patent/WO2024127536A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/02—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising gravity
    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant

Definitions

  • This disclosure relates to a gas-liquid separator, a compressor, and a refrigeration cycle device.
  • the gas-liquid separator that separates refrigerant flowing in from a refrigerant pipe into gas refrigerant and liquid refrigerant and supplies the gas refrigerant to a compressor (see, for example, Patent Document 1).
  • the gas-liquid separator has a container, a refrigerant inlet pipe that is connected to and passes through the top of the container, and a gas outlet pipe that is connected to and passes through the bottom of the container.
  • the gas-liquid separator further has a separation section that is disposed below the refrigerant inlet pipe in the container and separates the refrigerant containing lubricating oil that flows in from the refrigerant inlet pipe into a gas refrigerant and a mixture of liquid refrigerant and lubricating oil.
  • the gas outlet pipe has a first oil return hole and a second oil return hole formed at different heights near the bottom of the container.
  • the gas-liquid separator of Patent Document 1 with the above configuration separates the refrigerant flowing in from the outside into a gas refrigerant and a mixture of liquid refrigerant and lubricating oil by the separation section, allows the gas refrigerant to flow out from the gas outlet pipe, and stores the mixture of liquid refrigerant and lubricating oil at the bottom of the container.
  • the gas-liquid separator of Patent Document 1 also sucks the mixture of liquid refrigerant and lubricating oil stored at the bottom of the container into the gas outlet pipe through the first oil return hole and the second oil return hole, and causes it to flow out from the gas outlet pipe together with the gas refrigerant.
  • the fluid flowing out from the gas outlet pipe is supplied to the compressor shell having a compression mechanism inside.
  • the gas-liquid separator of Patent Document 1 maintains the sliding and sealing properties of the sliding parts between the components in the compression mechanism inside the compressor shell by supplying lubricating oil to the compressor shell through the first oil return hole and the second oil return hole.
  • the first oil return hole is located lower than the second oil return hole, and the gas-liquid separator of Patent Document 1 is able to supply lubricating oil to the compressor shell through the first oil return hole even when the amount of the mixture of liquid refrigerant and lubricating oil stored in the container is small.
  • the first oil return hole and the second oil return hole are provided near the bottom of the container in the gas outflow pipe. Therefore, in the gas-liquid separator of Patent Document 1, when the mixed liquid in the container is separated into two layers as described above, both the first oil return hole and the second oil return hole are located in the layer of the mixed liquid rich in liquid refrigerant. Therefore, in the gas-liquid separator of Patent Document 1, the mixed liquid sucked into the gas outflow pipe through the first oil return hole and the second oil return hole from both the first oil return hole and the second oil return hole is a mixed liquid rich in liquid refrigerant, and the proportion of lubricating oil is small. Therefore, in the gas-liquid separator of Patent Document 1, it is difficult to ensure the return amount of lubricating oil necessary to ensure the sliding and sealing properties in the compression mechanism, and there is a problem that the oil return performance is reduced.
  • the present disclosure is intended to solve the above-mentioned problems, and aims to provide a gas-liquid separator, compressor, and refrigeration cycle device that can improve oil return performance.
  • the gas-liquid separator comprises an external container having a first top, a first bottom, and a first circumferential portion; a refrigerant inlet pipe that is provided penetrating the first top of the external container and that allows a refrigerant containing lubricating oil to flow from the outside of the external container to the inside; a separation section that is disposed inside the external container and separates the refrigerant containing lubricating oil that has flowed in from the refrigerant inlet pipe into a gas refrigerant and a mixture of liquid refrigerant and lubricating oil; and an internal space that is disposed inside the external container below the separation section and has a second top, a second bottom, and a second circumferential portion, and that forms an external space between the external container and the gas-liquid separator in which the mixture of liquid refrigerant and lubricating oil separated in the separation section accumulates, and a gas inlet for the gas refrigerant separated in the separation section is provided in the second
  • the gas outlet pipe is provided vertically penetrating the second bottom of the inner container and the first bottom of the outer container, with one end located inside the inner container and the other end located outside the outer container, and allows the gas refrigerant that has flowed into the inner container from the gas inlet to flow out of the outer container.
  • the second top of the inner container is formed with a through hole below the gas inlet, and an oil inlet is formed to allow a mixture of the liquid refrigerant and lubricating oil that has accumulated in the external space to flow into the internal space of the inner container.
  • the gas outlet pipe is formed with a first oil return hole between the first bottom and the second bottom, and a second oil return hole between the second bottom and the oil inlet.
  • the compressor according to the present disclosure includes the above-mentioned gas-liquid separator, a compressor shell connected to the outside of the gas-liquid separator and into which the gas refrigerant separated by the gas-liquid separator is drawn, a rotating electric machine arranged inside the compressor shell, a rotating shaft connected to the rotating electric machine and rotated by the power of the rotating electric machine, and a compression mechanism connected to the rotating shaft and compressing the refrigerant drawn from the gas-liquid separator with the power of the rotating electric machine transmitted by the rotating shaft.
  • the refrigeration cycle device includes the above-mentioned compressor, a radiator in which the refrigerant compressed by the compressor radiates heat, a pressure reducer that reduces the pressure of the refrigerant flowing out of the radiator, and an evaporator in which the refrigerant flowing out of the pressure reducer evaporates.
  • the first oil return hole is located between the first bottom and the second bottom in the external space. Therefore, after the liquid level of the mixture of liquid refrigerant and lubricating oil accumulated in the external space reaches the first oil return hole, the gas-liquid separator, compressor, and refrigeration cycle device can suck the mixture of liquid refrigerant and lubricating oil from the external space into the gas outflow pipe and discharge it to the outside together with the gas refrigerant.
  • the mixture flowing from the external space to the internal space through the oil inlet is a lubricating oil-rich mixture. Therefore, the lubricating oil-rich mixture accumulates in the internal space. Since the lubricating oil-rich mixture accumulates in the internal space, the mixture flowing out of the gas outflow pipe to the outside through the second oil return hole becomes a lubricating oil-rich mixture. This allows the gas-liquid separator, compressor, and refrigeration cycle device to have improved oil return performance.
  • FIG. 1 is a schematic vertical cross-sectional view showing an overall configuration of a compressor according to a first embodiment.
  • 1 is a schematic cross-sectional view showing a gas-liquid separator according to a first embodiment.
  • 3 is a schematic cross-sectional view taken along line AA of FIG. 2.
  • FIG. 2 is a perspective view of an inner container of the gas-liquid separator according to the first embodiment.
  • 2 is a schematic perspective view of a separation section of the gas-liquid separator according to the first embodiment.
  • FIG. 5 is an explanatory diagram of the operation of the gas-liquid separator according to the first embodiment;
  • FIG. This is a schematic cross-sectional view taken along line AA in FIG.
  • FIG. 5 is a diagram illustrating the operation of the inclined wall portion of the inner vessel of the gas-liquid separator according to the first embodiment.
  • FIG. FIG. 4 is a dimensional explanatory diagram of the gas-liquid separator according to the first embodiment.
  • FIG. 4 is a dimensional explanatory diagram of a separation portion of the compressor according to the first embodiment.
  • FIG. 6 is a schematic cross-sectional view showing a gas-liquid separator according to a second embodiment.
  • FIG. 11 is a diagram showing a refrigeration cycle device according to a third embodiment.
  • FIG. 1 is a schematic vertical cross-sectional view showing the overall configuration of a compressor according to a first embodiment.
  • the compressor 1 is a rolling piston type compressor as an example of a compressor according to the present disclosure.
  • the compressor 1 includes a compressor outer shell 10, a compression mechanism 20, a rotating electric machine 30, a rotating shaft 40, a suction pipe 2, a discharge pipe 3, and a centrifugal pump 45.
  • the compressor 1 further includes a gas-liquid separator 5.
  • the compression mechanism 20, the rotating electric machine 30, the rotating shaft 40, and the centrifugal pump 45 are housed inside the compressor outer shell 10.
  • the gas-liquid separator 5 is disposed outside the compressor outer shell 10.
  • the direction in which the rotating shaft 40 extends is referred to as the axial direction
  • the direction perpendicular to the axial direction is referred to as the radial direction
  • the direction around the rotating shaft is referred to as the circumferential direction.
  • compressor 1 The detailed configuration of compressor 1 will be explained below.
  • the compressor outer casing 10 constituting the outer casing of the compressor 1 includes a head 11, a bottom 13, and a body 12.
  • the head 11 constitutes the outer casing of the upper part of the compressor 1.
  • the bottom 13 constitutes the outer casing of the lower part of the compressor 1.
  • the body 12 constitutes the outer casing of the middle part of the compressor 1, with the head 11 attached to the upper part and the bottom 13 attached to the lower part.
  • the head 11 that constitutes the upper part of the compressor housing 10 is, for example, approximately cup-shaped, as shown in FIG. 1.
  • a discharge pipe 3 that connects the inside and outside of the compressor housing 10 is connected to the head 11.
  • the body 12 constituting the middle part of the compressor outer casing 10 has, for example, a substantially cylindrical shape as shown in FIG. 1.
  • the body 12 is connected to an intake pipe 2 for supplying refrigerant into the compressor outer casing 10.
  • a stator 32 of a rotating electric machine 30 is attached to the inner circumferential surface of the body 12.
  • a compression mechanism 20 is attached to the inner circumferential surface of the body 12.
  • a rolling piston type compression mechanism is used as the compression mechanism 20.
  • the rolling piston type compression mechanism is often attached to the inner circumferential surface of the body 12, below the position where the stator 32 is attached.
  • the bottom 13 constituting the lower part of the compressor outer casing 10 is, for example, approximately cup-shaped, as shown in FIG. 1.
  • the bottom 13 stores lubricating oil 6. That is, the lubricating oil 6 is stored inside the compressor outer casing 10. This lubricating oil 6 is then supplied to the compression mechanism 20, etc., reducing friction in the sliding parts of the compression mechanism 20, etc.
  • the compression mechanism 20 is connected to a rotating shaft 40, and compresses a refrigerant supplied from the outside by the power of the rotating electric machine 30 transmitted by the rotating shaft 40.
  • the compression mechanism 20 is supplied with a refrigerant flowing out from a gas outlet pipe 54 (described later) of the gas-liquid separator 5. That is, the compression mechanism 20 draws in the external refrigerant via the suction piping 2, and compresses the refrigerant. The refrigerant compressed by the compression mechanism 20 is released into the compressor shell 10.
  • the compression mechanism 20 is provided with a cylinder that compresses the refrigerant sucked in from the outside.
  • the compression mechanism 20 is provided with a first cylinder 21A and a second cylinder 21B as cylinders.
  • the first cylinder 21A and the second cylinder 21B are configured in a cylindrical shape, and the refrigerant supplied from the suction pipe 2 is compressed in the compression space in the first cylinder 21A and the second cylinder 21B.
  • a first piston 22A is disposed within the first cylinder 21A and rotates freely within the first cylinder 21A.
  • This first piston 22A is connected to the rotating shaft 40 so as to be able to perform eccentric rotational motion within the first cylinder 21A with respect to the center of rotation of the rotating shaft 40.
  • eccentric rotational motion the rotational motion eccentric to the center of rotation of the rotating shaft 40 is referred to as eccentric rotational motion.
  • a second piston 22B is disposed within the second cylinder 21B and rotates freely within the second cylinder 21B. This second piston 22B is connected to the rotating shaft 40 so as to be able to perform eccentric rotational motion within the second cylinder 21B.
  • first piston 22A is connected to the rotating shaft 40 so that it can rotate within the first cylinder 21A with a phase shift of 180 degrees relative to the rotational phase when the second piston 22B rotates within the second cylinder 21B.
  • second piston 22B is connected to the rotating shaft 40 so that it can rotate within the second cylinder 21B with a phase shift of -180 degrees relative to the rotational phase when the first piston 22A rotates within the first cylinder 21A.
  • an upper bearing 24A is provided that rotatably supports the rotating shaft 40.
  • the upper bearing 24A closes the upper opening of the first cylinder 21A.
  • a partition plate 25 is provided on the lower side of the first cylinder 21A.
  • the partition plate 25 closes the lower opening of the first cylinder 21A and also closes the upper opening of the second cylinder 21B.
  • the partition plate 25 separates the space formed by the first cylinder 21A and the first piston 22A from the space formed by the second cylinder 21B and the second piston 22B.
  • a lower bearing 24B that rotatably supports the rotating shaft 40 is provided on the lower side of the second cylinder 21B.
  • the lower bearing 24B closes the lower opening of the second cylinder 21B.
  • the upper bearing 24A is provided with a valve (not shown) that releases the refrigerant compressed by the first cylinder 21A and the first piston 22A. When this valve is opened, it is possible to connect the space formed by the first cylinder 21A and the first piston 22A to the first muffler 23A described below.
  • the lower bearing 24B is provided with a valve (not shown) that releases the refrigerant compressed by the second cylinder 21B and the second piston 22B. When this valve is opened, it is possible to connect the space formed by the second cylinder 21B and the second piston 22B to the second muffler 23B described below.
  • a first muffler 23A is attached to the upper bearing 24A so as to cover a valve (not shown).
  • the first muffler 23A is provided with a refrigerant discharge section (not shown).
  • the refrigerant compressed by the first cylinder 21A and the first piston 22A is discharged into the space inside the first muffler 23A via the valve, and then released from the refrigerant discharge section into the inside of the compressor housing 10.
  • a second muffler 23B is attached to the lower bearing 24B so as to cover a valve (not shown).
  • the space inside the second muffler 23B is connected to the space inside the first muffler 23A via a refrigerant flow path (not shown).
  • the refrigerant compressed by the second cylinder 21B and the second piston 22B is discharged into the space inside the second muffler 23B, and then flows into the space inside the first muffler 23A via the refrigerant flow path (not shown).
  • the refrigerant that has flowed into the space inside the first muffler 23A is then released into the inside of the compressor shell 10 from the refrigerant discharge portion of the first muffler 23A.
  • the rotating electric machine 30 has a rotor 31 that transmits its own rotation to a rotating shaft 40, and a stator 32 that is configured by mounting multiple phase windings on a laminated core.
  • the rotating shaft 40 is connected to the rotating electric machine 30 and rotates by the power of the rotating electric machine 30.
  • the rotating shaft 40 also transmits the power of the rotating electric machine 30 to the compression mechanism 20.
  • the rotating shaft 40 is connected to the rotor 31 of the rotating electric machine 30 and rotates together with the rotation of the rotor 31.
  • the rotating shaft 40 rotates about an axis extending in the vertical direction of the paper surface of FIG. 1.
  • the upper end side of the rotating shaft 40 is connected to the rotor 31 of the rotating electric machine 30, and the lower end side of the rotating shaft 40 is connected to the compression mechanism 20. More specifically, the lower end side of the rotating shaft 40 is rotatably supported by the upper bearing 24A and the lower bearing 24B of the compression mechanism 20.
  • the first piston 22A and the second piston 22B are connected to the rotating shaft 40 between a portion rotatably supported by the upper bearing 24A and a portion rotatably supported by the lower bearing 24B so as to be capable of eccentric rotation.
  • the rotating shaft 40 is also formed with an oil supply hole 42 that opens into the end 41, which is one end of the rotating shaft 40.
  • the oil supply hole 42 extends along the center of rotation of the rotating shaft 40.
  • the end 41 is the lower end of the rotating shaft 40.
  • the rotating shaft 40 is also formed with a first oil supply port 43 and a second oil supply port 44.
  • the first oil supply port 43 and the second oil supply port 44 serve as flow paths that supply the lubricating oil 6 sucked into the oil supply hole 42 to the sliding parts of the compression mechanism 20.
  • One end of the first oil supply port 43 and the second oil supply port 44 is connected to the oil supply hole 42.
  • the other end of the first oil supply port 43 and the second oil supply port 44 opens into a location on the outer circumferential surface of the rotating shaft 40 that faces the compression mechanism 20. Specifically, the other end of the first oil supply port 43 opens at a location radially opposite the upper bearing 24A of the compression mechanism 20. The other end of the second oil supply port 44 opens at a location radially opposite the lower bearing 24B of the compression mechanism 20.
  • the suction pipe 2 is a pipe that draws the gas refrigerant separated in the gas-liquid separator 5 into the compressor shell 10. That is, the suction pipe 2 is a pipe that draws low-temperature and low-pressure refrigerant into the compressor shell 10.
  • the suction pipe 2 is connected to the body portion 12 of the compressor shell 10.
  • the number of suction pipes 2 is the same as the number of cylinders of the compression mechanism 20, and two in this example.
  • One end of each of the two suction pipes 2 is connected to the first cylinder 21A and the second cylinder 21B of the compression mechanism 20.
  • the other end of each of the two suction pipes 2 is connected to a gas outflow pipe 54 of the gas-liquid separator 5, which will be described later.
  • the discharge pipe 3 is a pipe that discharges the refrigerant compressed by the compression mechanism 20 to the outside of the compressor shell 10. That is, the discharge pipe 3 is a pipe that discharges the high-temperature, high-pressure refrigerant in the compressor shell 10 to the outside of the compressor shell 10. The discharge pipe 3 is connected to a head 11 of the compressor shell 10.
  • the centrifugal pump 45 is a fluid machine that draws up the lubricating oil 6 stored in the bottom 13 of the compressor outer shell 10 by centrifugal force generated by the rotational motion of the rotating shaft 40.
  • the centrifugal pump 45 is provided inside the oil supply hole 42 of the rotating shaft 40.
  • the centrifugal pump 45 is formed by twisting a plate-shaped member.
  • the lubricating oil 6 drawn up to the oil supply hole 42 by the centrifugal pump 45 is supplied to the sliding part of the compression mechanism 20. Specifically, a part of the lubricating oil 6 drawn up to the oil supply hole 42 is supplied to the sliding part between the upper bearing 24A of the compression mechanism 20 and the rotating shaft 40 through the first oil supply port 43.
  • a part of the lubricating oil 6 drawn up to the oil supply hole 42 is supplied to the sliding part between the lower bearing 24B of the compression mechanism 20 and the rotating shaft 40 through the second oil supply port 44.
  • the lubricating oil 6 for example, mineral oil-based, alkylbenzene-based, polyalkylene glycol-based, polyvinyl ether-based, polyol ester-based lubricating oil, or the like is used.
  • FIG. 2 is a schematic cross-sectional view showing the gas-liquid separator 5 according to the first embodiment.
  • FIG. 3 is a schematic cross-sectional view taken along line A-A in FIG. 2.
  • FIG. 4 is a partial perspective view of the internal container 51 of the gas-liquid separator 5 according to the first embodiment, viewed from above.
  • FIG. 5 is a schematic perspective view of the separation section 55 of the gas-liquid separator 5 according to the first embodiment.
  • the gas-liquid separator 5 separates the refrigerant containing lubricating oil flowing in from the outside into a gas refrigerant and a mixture of liquid refrigerant and lubricating oil, and while discharging the gas refrigerant to the outside, stores the mixture of liquid refrigerant and lubricating oil inside.
  • the gas-liquid separator 5 functions as an accumulator that stores excess refrigerant in the refrigeration cycle circuit.
  • the gas-liquid separator 5 is provided in the refrigeration cycle circuit to prevent the liquid refrigerant from flowing into the compressor outer casing 10 and causing liquid compression.
  • the gas-liquid separator 5 also has a function of returning the lubricating oil to the compressor outer casing 10.
  • the gas-liquid separator 5 supplies the lubricating oil to the compressor outer casing 10 together with the liquid refrigerant when returning the oil, but the amount of liquid refrigerant at this time is an amount that does not cause inconvenience due to liquid compression.
  • the gas-liquid separator 5 also functions as a muffler that reduces refrigerant noise, etc., generated when the refrigerant flows into the compressor outer casing 10.
  • the gas-liquid separator 5 comprises an external container 50, an internal container 51, a fixing member 52, a refrigerant inlet pipe 53, a gas outlet pipe 54, and a separation section 55.
  • the external container 50 is a vertically long container having a first top 50a, a first bottom 50b, and a first periphery 50c, and constitutes the outer shell of the gas-liquid separator 5.
  • the external container 50 is divided at the first periphery 50c into an upper external container 50A having a first top 50a and a lower external container 50B having a first bottom 50b, and the upper external container 50A and the lower external container 50B are joined at the divided portion of the first periphery 50c.
  • the upper external container 50A is a bottomed cylindrical container that is open at the bottom
  • the lower external container 50B is a bottomed cylindrical container that is open at the top.
  • the internal container 51 is a vertically long container smaller than the external container 50.
  • the internal container 51 is disposed inside the external container 50 below the separation section 55 described below.
  • the internal container 51 is disposed inside the external container 50, and forms an external space S1 between the internal container 51 and the external container 50 in which the mixture of the liquid refrigerant and the lubricating oil separated in the separation section 55 accumulates.
  • the internal container 51 has a second top 51a, a second bottom 51b, and a second periphery 51c.
  • the internal container 51 has a cylindrical cross-sectional shape, the second top 51a is located at the top of the cylindrical second periphery 51c, and the bottom of the second periphery 51c is located at the bottom of the second periphery 51c, and the second top 51a, the second bottom 51b, and the second periphery 51c are integrally formed.
  • the second top portion 51a has a slanted wall portion 51A whose diameter decreases from bottom to top.
  • the slanted wall portion 51A is a slanted wall that slopes toward the center of the inner container 51 from bottom to top.
  • the slanted wall portion 51A has the function of preventing the mixture of liquid refrigerant and lubricating oil separated in the separation portion 55 from flowing directly into the gas outflow pipe 54. Note that in Figure 3, the portion indicated by dots indicates the slanted wall portion 51A.
  • the second top 51a has a gas inlet 51a1 formed in the center of the upper end of the inclined wall 51A through which the gas refrigerant separated in the separation section 55 flows.
  • the gas inlet 51a1 is formed as a circular through hole.
  • the second top 51a further has an oil inlet 51a2 formed therein, which allows a mixture of liquid refrigerant and lubricating oil accumulated in the upper side of the external space S1 between the internal container 51 and the external container 50 to flow into the internal space S2 of the internal container 51.
  • the oil inlet 51a2 is formed as a groove extending downward from the circular edge of the gas inlet 51a1.
  • the oil inlet 51a2 is not limited to a groove, and may be formed as an independent through hole separated from the gas inlet 51a1. In short, the oil inlet 51a2 may be formed as a through hole formed below the gas inlet 51a1. Three oil inlets 51a2 are formed around the gas inlet 51a1 at intervals in the circumferential direction. The number of oil inlets 51a2 is not limited to three, but may be two, four or more.
  • the internal container 51 is fixed to the inside of the lower external container 50B by fixing members 52.
  • the fixing members 52 are plate-shaped members, and as shown in FIG. 3, four of them are arranged at intervals in the circumferential direction between the internal container 51 and the lower external container 50B, and connect the internal container 51 and the external container 50B by welding or the like.
  • the number of fixing members 52 is not limited to four, and may be two or more.
  • the refrigerant inlet pipe 53 is a pipe that allows refrigerant containing lubricating oil to flow from the outside of the external container 50 to the inside.
  • the refrigerant inlet pipe 53 is provided to penetrate the first top part 50a of the external container 50 in the vertical direction.
  • the gas outlet pipe 54 is a pipe that allows the gas refrigerant separated in the separation part 55 to flow out of the external container 50.
  • One end of the gas outlet pipe 54 is located inside the internal container 51 and the other end is located outside the external container 50, and the gas outlet pipe 54 is provided to penetrate the second bottom part 51b of the internal container 51 and the first bottom part 50b of the external container 50 in the vertical direction.
  • the number of gas outlet pipes 54 is the same as the number of suction pipes 2 connected to the compressor outer casing 10, and two are provided here.
  • the gas outflow pipe 54 is divided into two, an inner pipe 54A located inside the outer container 50, and an outer pipe 54B located outside the outer container 50.
  • the inner pipe 54A is formed to extend in a straight line, with its upper end located inside the inner container 51 and its lower end penetrating both the second bottom 51b of the inner container 51 and the first bottom 50b of the outer container 50 and protruding to the outside of the outer container 50.
  • the inner pipe 54A has a free upper end and a lower end fixed to both the second bottom 51b of the inner container 51 and the first bottom 50b of the outer container 50.
  • the outer pipe 54B is composed of a tube having a curved section between one end connected to the inner pipe 54A and the other end connected to the suction pipe 2.
  • the lower end of the inner pipe 54A protrudes downward below the external container 50 and has an expanded diameter, and one end of the outer pipe 54B is inserted inside the expanded diameter section and connected to the inner pipe 54A.
  • the inner pipe 54A is formed with a first oil return hole 60A and a second oil return hole 60B.
  • the first oil return hole 60A is formed outside the internal container 51 in the inner pipe 54A.
  • the first oil return hole 60A is formed below the second bottom 51b of the internal container 51 in the inner pipe 54A.
  • the first oil return hole 60A is connected to the external space S1 between the internal container 51 and the external container 50.
  • the first oil return hole 60A is located between the first bottom 50b of the external container 50 and the second bottom 51b of the internal container 51.
  • the second oil return hole 60B is formed at the bottom of the internal container 51 in the inner pipe 54A.
  • the second oil return hole 60B is connected to the internal space S2 in the internal container 51.
  • the second oil return hole 60B is located between the second bottom 51b of the internal container 51 and the oil inlet 51a2.
  • the gas outflow pipe 54 is divided into two pipes, an inner pipe 54A and an outer pipe 54B, for the following reasons. If the gas outflow pipe 54 were not divided, the assembly procedure would be as follows, for example. Note that the following procedure is based on the premise that the outer container 50 has a structure divided into an upper outer container 50A and a lower outer container 50B.
  • the inner container 51 is fixed inside the lower outer container 50B by the fixing member 52.
  • an unseparated gas outflow pipe is passed from below through the through holes provided in the first bottom 50b of the lower outer container 50B and the second bottom 51b of the inner container 51. Then, the gas outflow pipe is fixed to each of the first bottom 50b of the outer container 50 and the second bottom 51b of the inner container 51 by welding or the like.
  • welding between the gas outflow pipe and the first bottom 50b of the outer container 50 can be performed from outside the outer container 50.
  • welding is to be performed between the gas outflow pipe and the second bottom 51b of the inner container 51, it must be performed through the gap between the fixing members 52 fixed around the periphery of the inner container 51, and in practice welding is impossible because the torch of the welding machine cannot reach there.
  • the gas outflow pipe 54 is not divided into two, it is impossible to fix the gas outflow pipe 54.
  • the gas outflow pipe 54 when the gas outflow pipe 54 is divided into two pipes, an inner pipe 54A and an outer pipe 54B, the gas outflow pipe 54 can be fixed to the inner container 51 and the outer container 50 as follows. First, the inner pipe 54A is passed from inside the inner container 51 through the through hole in the second bottom 51b of the inner container 51, so that the lower end of the inner pipe 54A protrudes from the inner container 51. Then, the inner pipe 54A and the second bottom 51b of the inner container 51 are fixed together by, for example, welding.
  • the assembly with the inner container 51 and the inner pipe 54A fixed is inserted into the lower outer container 50B, and the lower end of the inner pipe 54A is caused to protrude downward from the through hole in the first bottom 50b of the lower outer container 50B.
  • the lower end of the inner pipe 54A protruding downward from the through hole in the first bottom 50b of the lower outer container 50B is then expanded in diameter, and the expanded portion is fixed to the lower outer container 50B by welding or the like.
  • One end of the outer pipe 54B is then inserted into the expanded portion of the inner pipe 54A, and the expanded portion of the inner pipe 54A is fixed to one end of the outer pipe 54B by welding or the like.
  • the gas-liquid separator 5 has a gas outflow pipe 54 divided into two pipes, an inner pipe 54A and an outer pipe 54B, which makes it possible to fix the gas outflow pipe 54 to the inner container 51 and the outer container 50.
  • the separation unit 55 is disposed inside the external container 50 and separates the refrigerant containing the lubricating oil 6 that flows in from the refrigerant inlet pipe 53 into a gas refrigerant and a mixture of liquid refrigerant and lubricating oil.
  • the separation unit 55 is disposed between the end of the refrigerant inlet pipe 53 inside the external container 50 and the internal container 51.
  • the separation unit 55 is fixed to the inner circumferential surface of the upper external container 50A.
  • the separation portion 55 is made of metal, and as shown in FIG. 5, has a disk-shaped upper surface portion 55a and a cylindrical portion 55b extending downward from the outer periphery of the upper surface portion 55a.
  • the upper surface portion 55a and the cylindrical portion 55b are integrally formed.
  • the upper surface portion 55a is provided with three inclined surface portions 56 in the circumferential direction about the central axis O of the upper surface portion 55a.
  • the inclined surface portions 56 are portions that incline downward as they move from the radial inner side to the radial outer side of the upper surface portion 55a.
  • the inclined surface portions 56 are also curved downwardly in a convex manner.
  • the lower edge 56a of the inclined surface portion 56 is an arcuate shape that convexes radially outward when viewed in the axial direction of the central axis O.
  • the upper edge 56b of the inclined surface portion 56 is an arcuate shape that convexes radially inward when viewed in the axial direction of the central axis O.
  • the lower edge 56a of the inclined surface portion 56 is separated and spaced apart from a flat portion of the upper surface portion 55a that is radially outward of the lower edge 56a. This spaced apart portion forms a communication hole 57 that connects the upper and lower parts of the upper surface portion 55a. There are three communication holes 57 formed in the circumferential direction around the central axis O, the same number as the inclined surface portions 56.
  • the inclined surface portion 56 is formed by pushing the radially inner portion downward in a curved shape out of the radially inner portion and the radially outer portion separated by a circular arc-shaped cut C on the center axis O, which is placed between points A and B on the upper surface portion 55a.
  • the cut C corresponds to the outer peripheral edge of the communication hole 57. Therefore, the outer peripheral edge of the communication hole 57 is in the shape of a circular arc on the center axis O of the upper surface portion 55a.
  • the number of the inclined surface portions 56 is not limited to three, and may be four or more. However, the number of the inclined surface portions 56 and the number of the oil inlets 51a2 of the internal container 51 are the same, and as shown in FIG. 3, the oil inlets 51a2 are configured to be located between the inclined surface portions 56 adjacent to each other in the circumferential direction when viewed in the axial direction. The reason for this configuration will be described later.
  • FIG. 6 is an explanatory diagram of the operation of the gas-liquid separator 5 according to the first embodiment.
  • FIG. 7 is a diagram showing the flow of the gas refrigerant and the mixed liquid of the liquid refrigerant and the lubricant oil in the schematic cross section A-A in FIG. 2.
  • the outline arrows indicate the flow of the gas refrigerant
  • the hatched arrows indicate the flow of the mixed liquid of the liquid refrigerant and the lubricant oil.
  • mixed liquids with different oil concentrations are shown by changing the type of hatching.
  • FIG. 1 mixed liquids with different oil concentrations are shown by changing the type of hatching.
  • Lubricant oil rich indicates a mixed liquid containing a large amount of lubricant oil and having a relatively high oil concentration.
  • Liquid refrigerant rich indicates a mixed liquid containing a large amount of liquid refrigerant and having a relatively low oil concentration.
  • Intermediate mixed liquid indicates a mixed liquid with an oil concentration between “lubricant oil rich” and “liquid refrigerant rich”.
  • Fig. 6(a) The refrigerant that flows into the external container 50 from the refrigerant inlet pipe 53 collides with the separation section 55 and is separated into a gas refrigerant and a mixture of liquid refrigerant and lubricating oil.
  • the separated gas refrigerant and the mixture of liquid refrigerant and lubricating oil are guided by the sloped surface 56 of the separation section 55 and flow into the lower part of the separation section 55 through the communication hole 57.
  • the gas refrigerant that flows into the lower part of the separation section 55 flows into the gas outlet pipe 54 from the upper opening 54a of the gas outlet pipe 54 as shown by the white arrow, and flows out from the lower opening 54b and is supplied to the compressor outer casing 10.
  • Figure 6(a) shows the state in which the mixture of liquid refrigerant and lubricating oil has accumulated in the external space S1.
  • the mixture that has accumulated in the external space S1 is an intermediate mixture with an intermediate oil concentration.
  • an intermediate mixed liquid with an intermediate oil concentration is sucked into the gas outflow pipe 54 from the external space S1 through the first oil return hole 60A.
  • the intermediate mixed liquid with an intermediate oil concentration sucked into the gas outflow pipe 54 flows out of the lower opening 54b together with the gas refrigerant flowing from the upper opening 54a to the lower opening 54b of the gas outflow pipe 54, and is supplied to the compressor outer casing 10.
  • the gas-liquid separator 5 supplies the intermediate mixed liquid with an intermediate oil concentration together with the gas refrigerant to the compressor outer casing 10 through the first oil return hole 60A.
  • the oil inlet 51a2 provided at the top of the internal container 51 is located between the circumferentially adjacent sloped surfaces 56 in the separation section 55 when viewed in the axial direction as shown in FIG. 3.
  • the sloped surfaces 56 are positioned to avoid the oil inlet 51a2. Therefore, the gas-liquid separator 5 can prevent the mixture of liquid refrigerant and lubricating oil separated in the separation section 55 from being guided by the sloped surfaces 56 and flowing directly from the oil inlet 51a2 into the internal container 51, and ultimately into the gas outlet pipe 54.
  • Figure 6(b) As the mixture of liquid refrigerant and lubricating oil continues to flow into the external space S1, the liquid level in the external space S1 rises.
  • the lubricating oil and the liquid refrigerant have low compatibility, and the lubricating oil and the liquid refrigerant separate, especially in a low outside temperature environment.
  • Figure 6(b) shows the state in which the mixture stored in the external space S1 separates, resulting in two layers, with a lubricating oil-rich layer containing a relatively low density lubricating oil positioned above a liquid refrigerant-rich layer containing a relatively high density liquid refrigerant.
  • the liquid refrigerant-rich mixed liquid is sucked into the gas outflow pipe 54 from the external space S1 through the first oil return hole 60A.
  • the liquid refrigerant-rich mixed liquid sucked into the gas outflow pipe 54 flows out of the lower opening 54b together with the gas refrigerant flowing from the upper opening 54a to the lower opening 54b of the gas outflow pipe 54, and is supplied to the compressor outer casing 10.
  • the gas-liquid separator 5 supplies the liquid refrigerant-rich mixed liquid together with the gas refrigerant to the compressor outer casing 10 through the first oil return hole 60A.
  • Figure 6(c) As the mixture of lubricant and liquid refrigerant continues to flow into the external space S1, the lubricant-rich mixture flows from the external space S1 through the oil inlet 51a2 into the internal space S2 of the internal container 51, as indicated by the cross-hatched arrows.
  • Figure 6(c) shows a state in which the lubricant-rich mixture that has flowed from the external space S1 into the internal container 51 has not yet reached the height position of the second oil return hole 60B.
  • the gas-liquid separator 5 supplies the liquid refrigerant-rich mixture together with the gas refrigerant to the compressor casing 10 through the first oil return hole 60A, just like in FIG. 6(b).
  • Figure 6(d) As the mixture of lubricant and liquid refrigerant continues to flow into the external space S1, the lubricant-rich mixture continues to flow from the external space S1 into the internal space S2 through the oil inlet 51a2, as indicated by the cross-hatched arrows.
  • Figure 6(d) shows the state in which the lubricant-rich mixture that has flowed from the external space S1 into the internal space S2 has accumulated to a position higher than the second oil return hole 60B.
  • the gas-liquid separator 5 supplies the liquid refrigerant-rich mixture to the compressor outer casing 10 through the first oil return hole 60A, and supplies the lubricant-rich mixture to the compressor outer casing 10 through the second oil return hole 60B.
  • the gas-liquid separator 5 supplies both the liquid refrigerant-rich mixture and the lubricant-rich mixture to the compressor outer casing 10 together with the gas refrigerant.
  • the gas-liquid separator 5 supplies lubricating oil to the compressor outer casing 10 only through the first oil return hole 60A until the liquid level in the internal container 51 reaches the second oil return hole 60B.
  • the refrigerant flows into the gas-liquid separator 5 in a single gas phase, so the liquid level does not reach the second oil return hole 60B.
  • the first oil return hole 60A has the function of returning oil so that the oil can be returned even when the amount of liquid in the gas-liquid separator 5 is small. Then, after the liquid level in the internal container 51 reaches the second oil return hole 60B, the gas-liquid separator 5 supplies lubricating oil to the compressor outer casing 10 through both the first oil return hole 60A and the second oil return hole 60B.
  • the gas-liquid separator of Patent Document 1 has only one container, which corresponds to the external container 50 of the gas-liquid separator 5. Therefore, when a two-layer state is formed in the container in which a layer of lubricant-rich mixed liquid containing a large amount of lubricant oil is located above a layer of liquid refrigerant-rich mixed liquid containing a large amount of liquid refrigerant, both the first oil return hole and the second oil return hole are located in the layer of the liquid refrigerant-rich mixed liquid. In other words, in the gas-liquid separator of Patent Document 1, both the first oil return hole and the second oil return hole are located in the layer of the mixed liquid with a small proportion of lubricant oil. Therefore, in the gas-liquid separator of Patent Document 1, the proportion of oil concentration in the mixed liquid supplied to the compressor outer shell through both the first oil return hole and the second oil return hole is small, and the sliding properties and sealing properties of the compressor 1 are reduced.
  • the gas-liquid separator 5 has an internal container 51 in an external container 50, and the lubricant-rich mixed liquid is stored in the internal space S2 of the internal container 51, and the second oil return hole is located in the internal space S2. Therefore, as shown in FIG. 6(d), the gas-liquid separator 5 can supply the lubricant-rich mixed liquid to the compressor outer shell 10 through the second oil return hole 60B after the liquid level of the lubricant-rich mixed liquid reaches the height position of the second oil return hole 60B.
  • the gas-liquid separator 5 can improve the oil return performance compared to the gas-liquid separator of Patent Document 1, which supplies only the liquid refrigerant-rich mixed liquid to the compressor outer shell from both of the two oil return holes after the mixed liquid in the external space S1 is separated into a layer of the lubricant-rich mixed liquid and a layer of the liquid refrigerant-rich mixed liquid.
  • the first oil return hole 60A is located in the external space S1 where the mixture of liquid refrigerant and lubricating oil begins to accumulate, the function of the first oil return hole 60A is the same as the first oil return hole of the gas-liquid separator in Patent Document 1.
  • FIG. 8 is an explanatory diagram of the operation of the inclined wall portion 51A of the internal container 51 of the gas-liquid separator 5 according to the first embodiment.
  • the dotted line indicates a case where the second top portion 51a of the internal container 51 does not have the inclined wall portion 51A and is cylindrical with the same diameter from bottom to top.
  • the second top portion 51a of the internal container 51 has the inclined wall portion 51A, and compared to the case where the second top portion 51a of the internal container 51 is cylindrical as shown by the dotted line, the gas-liquid separator 5 can suppress the mixture of the liquid refrigerant and the lubricating oil from directly flowing into the gas outflow pipe 54, as described below.
  • the mixture of liquid refrigerant and lubricating oil separated in the separation portion 55 bounces off the flat surface.
  • the bounced mixture of liquid refrigerant and lubricating oil becomes caught up in the flow of gas refrigerant from the refrigerant inlet pipe 53 toward the gas outlet pipe 54, and is more likely to flow into the gas outlet pipe 54.
  • the gas-liquid separator 5 has an inclined wall portion 51A in the second top portion 51a of the internal container 51, which forms an inclined surface that slopes downward. Therefore, the gas-liquid separator 5 can suppress the above-mentioned bounce compared to a configuration in which the upper surface of the second top portion 51a of the internal container 51 is a flat surface, and as a result, it can suppress the mixture of liquid refrigerant and lubricating oil from flowing directly into the gas outflow pipe 54.
  • Fig. 9 is a dimensional explanatory diagram of the gas-liquid separator 5 according to embodiment 1.
  • Fig. 10 is a dimensional explanatory diagram of the separation section 55 of the compressor 1 according to embodiment 1.
  • the gas-liquid separator 5 has the following dimensional relationships (1) to (5).
  • the outer diameter ⁇ A of the internal container 51 is smaller than the diameter ⁇ B of an imaginary circle including each of the arc-shaped notches C. If the outer diameter ⁇ A is larger than the diameter ⁇ B, the mixture of the liquid refrigerant and the lubricating oil separated in the separation section 55 will tend to flow directly into the gas outflow pipe 54. Although the outer diameter ⁇ A is smaller than the diameter ⁇ B, if it is too small, the volume of the internal container 51 will be small and the amount of lubricating oil supplied to the compressor outer casing 10 from the second oil return hole 60B will be reduced. In light of the above, the outer diameter ⁇ A is set to be in the range of 0.9 to 1.0 times the diameter ⁇ B.
  • the diameter ⁇ C of the gas inlet 51a1 of the inner container 51 is larger than the diameter ⁇ D of an imaginary circle that circumscribes the two gas outlet pipes 54 so as to include them inside.
  • the diameter ⁇ D is the sum of the center distance between the two gas outlet pipes 54 and the diameter of the gas outlet pipe 54.
  • the diameter ⁇ C is equal to or smaller than the diameter ⁇ D
  • the mixture of the liquid refrigerant and the lubricating oil will flow directly into the gas outlet pipe 54 for the following reasons.
  • the liquid level of the mixture of the liquid refrigerant and the lubricating oil accumulated outside the internal container 51 is located at the height of the oil inlet 51a2. For this reason, when the mixture of the liquid refrigerant and the lubricating oil separated in the separation section 55 flows into the liquid level, it is assumed that the mixture will be scattered above the liquid level, that is, near the oil inlet 51a2.
  • the diameter ⁇ C is set to be in the range of 1.0 to 1.1 times the diameter ⁇ D.
  • the distance E between the upper end 54aa of the inner pipe 54A and the upper end surface 51aa of the internal container 51 is shorter than the distance F between the upper end 54aa of the inner pipe 54A and the lower end 56c of the inclined portion 56 of the separation portion 55.
  • the distance E is shorter than the distance F, if the distance E is too shorter than the distance F, the mixture of the liquid refrigerant and the lubricating oil is likely to flow directly into the gas outlet pipe 54 for the following reason.
  • the liquid level of the mixture of the liquid refrigerant and the lubricating oil accumulated outside the internal container 51 is located at the height of the oil inlet 51a2. Therefore, it is assumed that the mixture of the liquid refrigerant and the lubricating oil separated in the separation portion 55 flows into the liquid level, causing the mixture to be scattered above the liquid level, i.e., near the oil inlet 51a2.
  • distance E is set in the range of 0.1 to 0.3 times distance F.
  • the vertical distance G of the inclined wall portion 51A of the internal container 51 is formed to be longer than ( ⁇ A- ⁇ C)/2.
  • the vertical distance G is formed to be longer than ( ⁇ A- ⁇ C)/2, as described above, it is possible to prevent the mixture of liquid refrigerant and lubricant oil separated in the separation portion 55 from bouncing off the second top portion 51a, being caught in the flow of gas refrigerant, and flowing directly into the gas outflow pipe 54.
  • the vertical distance G is less than ( ⁇ A- ⁇ C)/2, the inclination of the inclined wall portion 51A of the second top portion 51a becomes smaller, and the upper surface of the second top portion 51a approaches a flat surface as shown by the dotted line in FIG. 8. Therefore, if the vertical distance G is less than ( ⁇ A- ⁇ C)/2, the mixture of liquid refrigerant and lubricant oil separated in the separation portion 55 is more likely to flow directly into the gas outflow pipe 54.
  • the vertical distance G is longer than ( ⁇ A- ⁇ C)/2, but if it is too long, the volume of the internal container 51 will be smaller, and the amount of lubricating oil supplied to the compressor outer casing 10 from the second oil return hole 60B will be reduced. Taking the above into consideration, the vertical distance G is set in the range of 1.0 to 1.3 times ( ⁇ A- ⁇ C)/2.
  • the circumferential width H of the oil inlet 51a2 of the internal container 51 is formed smaller than the circumferential distance I between the adjacent inclined surface portions 56 in the separation portion 55. This is because if the circumferential width H is equal to or larger than the circumferential distance I, the mixture of the liquid refrigerant and the lubricating oil separated in the separation portion 55 is more likely to flow directly into the gas outlet pipe 54. Although the circumferential width H is smaller than the circumferential distance I, if it is too small, the mixture of the liquid refrigerant and the lubricating oil is more likely to flow directly into the gas outlet pipe 54 for the following reason.
  • the flow path of the oil inlet 51a2 narrows, and the amount of mixed liquid flowing into the internal container 51 from the oil inlet 51a2 decreases. If the amount of mixed liquid flowing into the internal container 51 from the oil inlet 51a2 decreases, the balance of the mixed liquid amount is lost. If the balance of the mixed liquid amount is lost and the amount of mixed liquid separated in the separation section 55 and flowing out of the internal container 51 becomes greater than the amount of mixed liquid flowing into the internal container 51 from the oil inlet 51a2, it is expected that the liquid level outside the internal container 51 will rise above the position of the oil inlet 51a2.
  • the circumferential width H is configured to be in the range of 0.8 to 0.9 times the circumferential distance I.
  • the gas-liquid separator 5 can store excess refrigerant while improving the oil return performance to the compressor shell 10.
  • the gas-liquid separator 5 is not limited to a configuration that satisfies all of the above dimensional settings (1) to (5), and includes a configuration that satisfies some of them.
  • gas-liquid separator 5 is formed so that the vertical distance J of the oil inlet 51a2 is shorter than the vertical distance G of the inclined wall portion 51A of the internal container 51.
  • the gas-liquid separator 5 separates the refrigerant that has flowed in together with the lubricating oil into a gas refrigerant and a mixture of liquid refrigerant and lubricating oil, and the gas refrigerant flows out from the gas outlet pipe 54.
  • the gas refrigerant that flows out from the gas outlet pipe 54 flows into the compression mechanism 20 in the compressor outer casing 10 via the suction pipe 2.
  • the gas-liquid separator 5 returns the lubricating oil to the compressor outer casing 10 via the first oil return hole 60A and the second oil return hole 60B depending on the internal condition.
  • a portion of the gas refrigerant that flows into the compression mechanism 20 is compressed by the first cylinder 21A and the first piston 22A to become a high-temperature, high-pressure gas refrigerant.
  • This high-temperature, high-pressure gas refrigerant flows into the first muffler 23A through the valve of the upper bearing 24A.
  • the high-temperature, high-pressure gas refrigerant that flows into the first muffler 23A is discharged into the space inside the compressor outer casing 10 from a refrigerant discharge section (not shown) provided in the first muffler 23A.
  • the high-temperature, high-pressure gas refrigerant discharged into the space inside the compressor outer casing 10 then moves to the upper part of the space inside the compressor outer casing 10 through gaps such as the rotating electric machine 30, and is discharged from the discharge piping 3.
  • the remainder of the gas refrigerant that flows into the compression mechanism 20 is compressed by the second cylinder 21B and the second piston 22B to become a high-temperature, high-pressure gas refrigerant.
  • This high-temperature, high-pressure gas refrigerant flows into the second muffler 23B through the valve of the lower bearing 24B.
  • the high-temperature, high-pressure gas refrigerant that flows into the second muffler 23B is sent from the second muffler 23B through a refrigerant flow path not shown to the first muffler 23A.
  • the high-temperature, high-pressure gas refrigerant sent to the first muffler 23A is then discharged into the space inside the compressor outer shell 10 from a refrigerant discharge part not shown provided in the first muffler 23A.
  • the high-temperature, high-pressure gas refrigerant discharged into the space inside the compressor outer shell 10 moves to the upper part of the space inside the compressor outer shell 10 through gaps such as the rotating electric machine 30, and is discharged from the discharge pipe 3.
  • the lubricating oil stored in the bottom 13 inside the compressor outer casing 10 is sucked up from the lower end of the oil supply hole 42 by the centrifugal pump 45 that rotates together with the rotating shaft 40.
  • the lubricating oil sucked up from the lower end of the oil supply hole 42 flows into the space between the upper bearing 24A and the rotating shaft 40 from the first oil supply port 43.
  • the lubricating oil sucked up from the lower end of the oil supply hole 42 flows into the space between the lower bearing 24B and the rotating shaft 40 from the second oil supply port 44.
  • some of the lubricating oil that flows between the lower bearing 24B and the rotating shaft 40 from the second oil supply port 44 flows between the lower bearing 24B and the lower surface of the second piston 22B.
  • the lubricating oil is used to smoothly rotate the first piston 22A and the second piston 22B, but some of the lubricating oil flows into the compression space, is compressed together with the low-pressure gas refrigerant, and is discharged in a state contained in the high-temperature, high-pressure gas refrigerant.
  • the compressor 1 of the first embodiment includes the external container 50, the refrigerant inlet pipe 53, the separation section 55, the internal container 51, and the gas outlet pipe 54.
  • the external container 50 has a first top section 50a, a first bottom section 50b, and a first circumferential section 50c.
  • the refrigerant inlet pipe 53 is provided penetrating the first top section 50a of the external container 50, and is a pipe through which the refrigerant containing the lubricating oil flows from the outside of the external container 50 to the inside.
  • the separation section 55 is disposed inside the external container 50, and separates the refrigerant containing the lubricating oil that flows in from the refrigerant inlet pipe 53 into a gas refrigerant and a mixture of the liquid refrigerant and the lubricating oil.
  • the internal container 51 is disposed below the separation section 55 inside the external container 50.
  • the internal container 51 has a second top 51a, a second bottom 51b, and a second circumferential portion 51c, and forms an external space S1 between the internal container 50 and the external container 50 in which the mixture of the liquid refrigerant and the lubricating oil separated in the separation portion 55 accumulates.
  • the second top 51a of the internal container 51 is formed with a gas inlet 51a1 for the gas refrigerant separated in the separation portion 55.
  • the second top 51a of the internal container 51 is formed with an oil inlet 51a2, which is constituted by a through hole below the gas inlet 51a1, and which allows the mixture of the liquid refrigerant and the lubricating oil accumulated in the external space S1 to flow into the internal space S2 of the internal container 51.
  • the gas outlet pipe 54 is provided to penetrate the second bottom 51b of the internal container 51 and the first bottom 50b of the external container 50 in the vertical direction.
  • the gas outflow pipe 54 has one end located inside the inner container 51 and the other end located outside the outer container 50, and is a pipe that allows the gas refrigerant that has flowed into the inner container 51 from the gas inlet 51a1 to flow out of the outer container 50.
  • the gas outflow pipe 54 has a first oil return hole 60A formed between the first bottom 50b and the second bottom 51b, and a second oil return hole 60B formed between the second bottom 51b and the oil inlet 51a2.
  • the first oil return hole 60A is located between the first bottom 50b and the second bottom 51b in the external space S1. Therefore, in the gas-liquid separator 5 of embodiment 1, after the liquid level of the mixture of liquid refrigerant and lubricating oil accumulated in the external space S1 reaches the first oil return hole, the mixture of liquid refrigerant and lubricating oil can be sucked from the external space S1 into the gas outflow pipe 54 and discharged to the outside together with the gas refrigerant.
  • the second oil return hole 60B is located between the second bottom 51b and the oil inlet 51a2, that is, the second oil return hole 60B is located inside the internal container 51.
  • a lubricating oil-rich mixture flows from the external space S1 to the internal space S2 through the oil inlet 51a2. Therefore, in the gas-liquid separator 5 of the first embodiment, after the liquid level of the mixture of liquid refrigerant and lubricant reaches the height position of the second oil return hole 60B, the lubricant-rich mixture can be supplied to the compressor outer casing 10 through the second oil return hole 60B.
  • the gas-liquid separator 5 of the first embodiment can increase the proportion of lubricant in the mixture of liquid refrigerant and lubricant flowing out from the gas outflow pipe 54 while maintaining the function of an accumulator that stores excess refrigerant, thereby improving the oil return performance.
  • the gas-liquid separator 5 of embodiment 1 can store excess refrigerant while improving the oil return performance to the compressor shell 10.
  • Embodiment 2. 11 is a schematic cross-sectional view showing a gas-liquid separator 5 according to embodiment 2.
  • the gas-liquid separator 5 of embodiment 2 the axial length between the lower external container 50B and the upper external container 50A of the external container 50 is specified.
  • the following description will focus on the configuration of embodiment 2 that differs from embodiment 1, and the configuration not described in embodiment 2 is the same as embodiment 1.
  • the axial length of the lower external container 50B is longer than that of the upper external container 50A.
  • the internal container 51 is fixed to the lower external container 50B by a fixing member 52 provided at the upper part inside the lower external container 50B.
  • the fixing member 52 Since the internal container 51 is vertically long, it is preferable that the fixing member 52 be positioned as high as possible in order to stably fix the internal container 51 to the external container 50.
  • the axial length of the lower external container 50B is longer than that of the upper external container 50A, and therefore the fixing member 52 can be disposed higher than in a configuration in which the axial length of the lower external container 50B is shorter than that of the upper external container 50A.
  • the internal container 51 can be fixed to the external container 50 at an upper position, and therefore the internal container 51 can be stably fixed to the external container 50, and the fixing strength can be increased.
  • Embodiment 3 relates to a refrigeration cycle apparatus including the compressor 1 according to the first or second embodiment.
  • FIG. 12 is a diagram showing a refrigeration cycle device according to embodiment 3.
  • the refrigeration cycle device 200 includes the compressor 1 according to embodiment 1 or embodiment 2, a radiator in which the refrigerant compressed by the compressor 1 radiates heat, a pressure reducer 203 such as an electric expansion valve that reduces the pressure of the refrigerant flowing out of the radiator, and an evaporator in which the refrigerant flowing out of the pressure reducer 203 evaporates.
  • the refrigeration cycle device 200 is used for various purposes such as a hot water supply device and a refrigeration device.
  • FIG. 12 shows an example in which the refrigeration cycle device 200 is used as an air conditioning device.
  • the refrigeration cycle device 200 shown in FIG. 12 is equipped with an indoor heat exchanger 204 that functions as a radiator during heating operation, and an outdoor heat exchanger 202 that functions as an evaporator during heating operation.
  • the refrigeration cycle device 200 shown in FIG. 12 is also capable of cooling operation.
  • the refrigeration cycle device 200 is equipped with a four-way switching valve 201.
  • the four-way switching valve 201 switches the heat exchanger connected to the discharge pipe 3, which is the refrigerant discharge port of the compressor 1, and switches the heat exchanger connected to the gas-liquid separator 5, which is the refrigerant intake port of the compressor 1.
  • the indoor heat exchanger 204 functions as an evaporator
  • the outdoor heat exchanger 202 functions as a radiator.
  • the indoor heat exchanger 204 is mounted in an indoor device.
  • the four-way switching valve 201, the outdoor heat exchanger 202, and the pressure reducer 203 are mounted in an outdoor device.
  • the refrigeration cycle device 200 uses R407C refrigerant, R410A refrigerant, R32 refrigerant, carbon dioxide refrigerant, etc.
  • the four-way switching valve 201 switches to the flow path shown by the solid lines in FIG. 12.
  • the discharge pipe 3 of the compressor 1 is connected to the indoor heat exchanger 204
  • the gas-liquid separator 5 of the compressor 1 is connected to the outdoor heat exchanger 202.
  • the indoor heat exchanger 204 functions as a radiator
  • the outdoor heat exchanger 202 functions as an evaporator.
  • the high-pressure liquid refrigerant flowing into the pressure reducer 203 is reduced in pressure by the pressure reducer 203 to become a low-temperature, low-pressure two-phase gas-liquid refrigerant, which flows out from the pressure reducer 203.
  • the low-temperature, low-pressure two-phase gas-liquid refrigerant flowing out from the pressure reducer 203 flows into the outdoor heat exchanger 202.
  • the low-temperature, low-pressure two-phase gas-liquid refrigerant flowing into the outdoor heat exchanger 202 absorbs heat from the outdoor air and evaporates, and flows out from the outdoor heat exchanger 202 as a low-pressure gas refrigerant or a two-phase gas-liquid refrigerant.
  • the low-pressure gas refrigerant or two-phase gas-liquid refrigerant flowing out from the outdoor heat exchanger 202 is sucked into the gas-liquid separator 5.
  • the low-pressure gas refrigerant out of the refrigerant sucked into the gas-liquid separator 5 is sucked into the compressor 1 via the gas outlet pipe 54.
  • the low-pressure gas refrigerant drawn into the compressor 1 is compressed by the compression mechanism 20 to become a high-temperature, high-pressure gas refrigerant.
  • This high-temperature, high-pressure gas refrigerant is discharged again from the compressor 1. That is, when the refrigeration cycle device 200 performs heating operation, the refrigerant circulates as shown by the solid arrows in FIG. 12.
  • the four-way switching valve 201 switches to the flow path shown by the dashed line in FIG. 12.
  • the discharge pipe 3 of the compressor 1 is connected to the outdoor heat exchanger 202
  • the gas-liquid separator 5 of the compressor 1 is connected to the indoor heat exchanger 204. That is, the outdoor heat exchanger 202 functions as a radiator, and the indoor heat exchanger 204 functions as an evaporator.
  • the high-temperature, high-pressure gas refrigerant compressed by the compressor 1 is discharged from the compressor 1, the high-temperature, high-pressure gas refrigerant flows into the outdoor heat exchanger 202.
  • the high-temperature, high-pressure gas refrigerant that flows into the outdoor heat exchanger 202 condenses while releasing heat to the outdoor air, and flows out of the outdoor heat exchanger 202 as a high-pressure liquid refrigerant.
  • the high-pressure liquid refrigerant flowing out from the outdoor heat exchanger 202 flows into the pressure reducer 203.
  • the high-pressure liquid refrigerant flowing into the pressure reducer 203 is reduced in pressure by the pressure reducer 203 to become a low-temperature, low-pressure two-phase gas-liquid refrigerant, which flows out from the pressure reducer 203.
  • the low-temperature, low-pressure two-phase gas-liquid refrigerant flowing out from the pressure reducer 203 flows into the indoor heat exchanger 204.
  • the low-temperature, low-pressure two-phase gas-liquid refrigerant flowing into the indoor heat exchanger 204 absorbs heat from the indoor air and evaporates, and flows out from the indoor heat exchanger 204 as a low-pressure gas refrigerant or a two-phase gas-liquid refrigerant. At this time, the air in the room is cooled.
  • the low-pressure gas refrigerant or two-phase gas-liquid refrigerant flowing out from the indoor heat exchanger 204 is sucked into the gas-liquid separator 5 of the compressor 1.
  • the low-pressure gas refrigerant out of the refrigerant sucked into the gas-liquid separator 5 of the compressor 1 is sucked into the compressor 1 via the gas outlet pipe 54.
  • the low-pressure gas refrigerant sucked into the compressor 1 is compressed by the compression mechanism 20 of the compressor 1 to become a high-temperature, high-pressure gas refrigerant.
  • This high-temperature, high-pressure gas refrigerant is discharged again from the compressor 1.
  • the refrigerant circulates as shown by the dashed arrows in FIG. 12.
  • the refrigeration cycle device 200 configured as described above includes the compressor 1 of embodiment 1 or embodiment 2, so that the proportion of lubricating oil in the mixture of the liquid refrigerant and lubricating oil flowing out of the gas-liquid separator 5 can be increased. As a result, the refrigeration cycle device 200 can improve the sliding properties and sealing properties of the sliding parts in the compressor 1.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)
PCT/JP2022/045953 2022-12-14 2022-12-14 気液分離器、圧縮機、及び冷凍サイクル装置 Ceased WO2024127536A1 (ja)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118882245A (zh) * 2024-09-03 2024-11-01 珠海格力节能环保制冷技术研究中心有限公司 一种排液缓冲器、降噪储液装置、空调外机及空调器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5143914U (https=) * 1974-09-28 1976-03-31
JPH0593558A (ja) * 1991-10-01 1993-04-16 Matsushita Electric Ind Co Ltd アキユムレータ
JPH0744237U (ja) * 1992-07-22 1995-11-07 三星電子株式会社 冷暖房兼用空気調和機のアキュムレータ構造

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5143914U (https=) * 1974-09-28 1976-03-31
JPH0593558A (ja) * 1991-10-01 1993-04-16 Matsushita Electric Ind Co Ltd アキユムレータ
JPH0744237U (ja) * 1992-07-22 1995-11-07 三星電子株式会社 冷暖房兼用空気調和機のアキュムレータ構造

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118882245A (zh) * 2024-09-03 2024-11-01 珠海格力节能环保制冷技术研究中心有限公司 一种排液缓冲器、降噪储液装置、空调外机及空调器

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