Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
  • F25B43/006—Accumulators
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
  • F04C23/008—Hermetic pumps
• • 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
  • F25B43/003—Filters
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2240/00—Components
  • F04C2240/80—Other components
  • F04C2240/804—Accumulators for refrigerant circuits
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
  • F25B2400/03—Suction accumulators with deflectors

Definitions

• Embodiments according to the present invention relate to an accumulator, a compressor, and a refrigeration cycle apparatus.
• a conventional accumulator includes a container, a partition plate that divides an internal space of the container into upper and lower spaces, a straight pipe that vertically extends to pass through the partition plate to open in a bottom space, and an outlet pipe that opens in the bottom space to be led out from a lower surface of the container.
• a lower end of the straight pipe that is, an outlet end of the straight pipe, is disposed in a vicinity of the partition plate.
• An upper end of the outlet pipe that is, an inlet end of the outlet pipe, is disposed in a vicinity of a bottom plate of the container. That is, the outlet end of the straight pipe is disposed above the inlet end of the outlet pipe.
• the accumulator temporarily catches refrigerating machine oil that is discharged from the compressor together with the refrigerant and circulates in a refrigerating cycle to return to the compressor, and returns the caught refrigerating machine oil to the compressor.
• the refrigerating machine oil at an excessive flow rate returns to the compressor from the accumulator.
• an object of the present invention is to provide an accumulator, a compressor including this accumulator, and a refrigeration cycle apparatus, wherein the accumulator can achieve both of gas-liquid separation capacity that can securely prevent a liquid refrigerant from flowing out, in other words, gas-liquid separation capacity that can securely prevent liquid compression in the compressor, and adjustment of an oil return flow rate to return caught refrigerating machine oil to the compressor at an appropriate flow rate.
• an accumulator includes: a container; a partition plate that is disposed inside the container, and divides an internal space of the container into a refrigerant introduction chamber and a refrigerant discharge chamber; an inlet pipe that is fixed to the container and includes an inlet flow channel connected to the refrigerant introduction chamber; at least one communication pipe including a communication flow channel that passes through the partition plate to connect the refrigerant introduction chamber with the refrigerant discharge chamber; and at least one outlet pipe that is fixed to the container and includes an outlet flow channel connected to the refrigerant discharge chamber.
• the at least one communication pipe includes an outlet opening disposed in the refrigerant discharge chamber and at least one introduction-side refrigerating machine oil return hole disposed in the refrigerant introduction chamber.
• the at least one outlet pipe includes an inlet opening disposed in the refrigerant discharge chamber and at least one discharge-side refrigerating machine oil return hole disposed in the refrigerant discharge chamber. Oil returning capability of the at least one discharge-side refrigerating machine oil return hole is higher than oil returning capability of the at least one introduction-side refrigerating machine oil return hole.
• a compressor includes: a sealed container; a compression mechanism housed in the sealed container; an electric motor that is housed in the sealed container and generates driving force of the compression mechanism; and the accumulator that is placed outside the sealed container and connected to a suction side of the compression mechanism.
• a refrigeration cycle apparatus includes: the compressor; a radiator; an expansion device; a heat absorber; and a refrigerant piping that connects the compressor, the radiator, the expansion device, and the heat absorber to circulate a refrigerant.
• Fig. 1 is a schematic diagram of the refrigeration cycle apparatus, the compressor, and the accumulator according to the embodiment of the present invention.
• a refrigeration cycle apparatus 1 includes a rotary compressor 2, a radiator 3, an expansion device 5, a heat absorber 6, an accumulator 7, and a refrigerant piping 8.
• the rotary compressor 2 is simply referred to as a "compressor 2" hereinafter.
• the refrigerant piping 8 successively connects the compressor 2, the radiator 3, the expansion device 5, the heat absorber 6, and the accumulator 7 to circulate a refrigerant.
• the refrigerant that circulates in the refrigeration cycle apparatus 1 is any of various refrigerants such as a carbon dioxide refrigerant, a R32 refrigerant, and a mixed refrigerant including R32 refrigerant.
• the radiator 3 may also be called a condenser, and the heat absorber 6 may also be called an evaporator.
• the compressor 2 includes a cylindrical-shaped sealed container 11 that is vertically disposed, an electric motor 12 housed in an upper half portion of the sealed container 11, a compression mechanism 13 housed in a lower half portion of the sealed container 11, a crank shaft 15 that transmits rotational driving force of the electric motor 12 to the compression mechanism 13, and a main bearing 16 and an auxiliary bearing 17 cooperating with each other to support the crank shaft 15 in a rotatable manner.
• the sealed container 11 has a cylindrical shape.
• the sealed container 11 includes a cylindrical-shaped drum 11a extending in an upper and lower direction, a hemispherical-shaped or elliptical-shaped upper end plate 11b that blocks an upper end portion of the drum 11a, and a hemispherical-shaped or elliptical-shaped lower end plate 11c that blocks a lower end portion of the drum 11a.
• the drum 11a supports a plurality of suction pipes 8b guiding the refrigerant to the compressor 2.
• the suction pipes 8b are connected to the accumulator 7.
• the suction pipes 8b are part of the refrigerant piping 8.
• the upper end plate 11b supports a discharge pipe 8a that discharges the refrigerant compressed by the compressor 2.
• the discharge pipe 8a is connected to the refrigerant piping 8.
• the upper end plate 11b includes a sealed terminal portion 18 that supplies electric power to the electric motor 12.
• the electric motor 12 generates driving force to rotate the compression mechanism 13.
• the electric motor 12 is, for example, a Permanent Magnet Synchronous Motor (PMSM).
• the electric motor 12 includes a tubular-shaped stator 21 fixed to an inner wall of the sealed container 11, a rotor 22 that is disposed on an inner side of the stator 21 and fixed to the crank shaft 15, and a plurality of lead wires 23 led out from the stator 21 and connected to the sealed terminal portion 18.
• PMSM Permanent Magnet Synchronous Motor
• the rotor 22 includes a rotor core having a magnet housing hole, and a permanent magnet housed in the magnet housing hole.
• the rotor 22 can rotate with respect to the stator 21, and fixed to the crank shaft 15 to be integrally rotatable therewith. Rotation center lines of the rotor 22 and the crank shaft 15 substantially agree with a center line of the stator 21.
• the lead wires 23 are wiring for supplying electric power to the stator 21 through the sealed terminal portion 18, what is called leads.
• the lead wires 23 are wired in accordance with a type of the electric motor 12. In a case in which the lead wires 23 are used as an open-winding type, two lead wires 23 are wired for each of a U-phase, a V-phase, and a W-phase, that is, the six lead wires 23 in total are wired. In a case in which the electric motor 12 is used with a star connection, one lead wire 23 is wired for each of the U-phase, the V-phase, and the W-phase, that is, the three lead wires 23 in total are wired.
• the crank shaft 15 couples the electric motor 12 with the compression mechanism 13.
• the crank shaft 15 transmits driving force generated by the electric motor 12 to the compression mechanism 13.
• crank shaft 15 connects the electric motor 12 with the compression mechanism 13, and is supported by the main bearing 16 in a rotatable manner.
• a lower end portion 15b of the crank shaft 15 is supported by the auxiliary bearing 17 in a rotatable manner.
• the main bearing 16 and the auxiliary bearing 17 are part of the compression mechanism 13. In other words, the crank shaft 15 passes through the compression mechanism 13.
• the crank shaft 15 includes a plurality of eccentric portions 25a and 25b between the intermediate portion 15a supported by the main bearing 16 and the lower end portion 15b supported by the auxiliary bearing 17.
• a portion closer to the main bearing 16 is referred to as a first eccentric portion 25a
• a portion closer to the auxiliary bearing 17 is referred to as a second eccentric portion 25b.
• Each of the eccentric portions 25a and 25b is a disk or a cylinder having a center not agreeing with the center of the crank shaft 15.
• the center of each of the eccentric portions 25a and 25b is decentered with a phase difference of about 180 degrees around the crank shaft 15.
• the first eccentric portion 25a is placed on an upper side closer to the electric motor 12, and the second eccentric portion 25b is placed on a lower side distant from the electric motor 12.
• the main bearing 16 on the upper side is fixed to a frame 14 via a first cylinder 32 by a plurality of fastening members, for example, bolts 51 and 52.
• the frame 14 is fixed to the sealed container 11 at a plurality of points by welding, for example, spot welding. That is, the frame 14 supports the compression mechanism 13, the crank shaft 15, and the rotor 22 of the electric motor 12 on the sealed container 11.
• the compression mechanism 13 When the electric motor 12 coupled to the compression mechanism 13 via the crank shaft 15 is rotated and driven, the compression mechanism 13 sucks a gaseous refrigerant through the suction pipes 8b, compresses the sucked refrigerant, and discharges the compressed refrigerant into the sealed container 11.
• a lower portion of the sealed container 11 is filled with refrigerating machine oil, and a major portion of the compression mechanism 13 is immersed in the refrigerating machine oil.
• the compression mechanism 13 includes more than one, for example, two rotor-cylinder assemblies 26 and 27.
• the compressor 2 is a multi-cylinder rotary compressor.
• the compression mechanism 13 includes the first rotor-cylinder assembly 26 disposed inside the sealed container 11, the second rotor-cylinder assembly 27 disposed inside the sealed container 11, and a partition plate 29 disposed between the first rotor-cylinder assembly 26 and the second rotor-cylinder assembly 27.
• the compressor 2 may be a multi-cylinder rotary compressor having three or more cylinders, or may be a rotary compressor having a single cylinder.
• the compressor 2 and the accumulator 7 are connected via the suction pipes 8b the number of which is the same as the number of the cylinders.
• the first rotor-cylinder assembly 26 includes the first cylinder 32 including a circular-shaped first cylinder chamber 31, and an annular-shaped first rolling piston 33 disposed inside the first cylinder chamber 31.
• the first rolling piston 33 is simply referred to as a "first piston 33" hereinafter.
• the second rotor-cylinder assembly 27 includes a second cylinder 42 including a circular-shaped second cylinder chamber 41, and an annular-shaped second rolling piston 43 disposed inside the second cylinder chamber 41.
• the second rolling piston 43 is simply referred to as a "second piston 43" hereinafter.
• Each of the rotor-cylinder assemblies 26 and 27 includes a vane 45 that partitions corresponding one of the cylinder chambers 31 and 41 into a suction chamber and a compression chamber by performing reciprocating motion for approaching or moving away from a rotation center line of the crank shaft 15 while being in contact with an outer peripheral surfaces of corresponding one of the pistons 33 and 43.
• Each of the rotor-cylinder assemblies 26 and 27 changes capacity of the compression chamber sectioned by corresponding one of the pistons 33 and 43 and the corresponding vane 45 by rotation of the pistons 33 and 43 to compress the refrigerant. Only the vane 45 of the second rotor-cylinder assembly 27 is illustrated in Fig. 1 .
• the first cylinder 32 and the second cylinder 42 are disposed to be stacked in an axis direction of the crank shaft 15.
• the first cylinder 32 on the upper side is disposed on a side closer to the electric motor 12.
• the second cylinder 42 on the lower side is disposed on a side distant from the electric motor 12.
• Each of the cylinders 32 and 42 includes an inner peripheral surface that defines corresponding one of the cylinder chambers 31 and 41.
• Each of the cylinders 32 and 42 has an annular shape and a plate shape including corresponding one of the cylinder chambers 31 and 41 inside.
• Each of the cylinders 32 and 42 has an end face close to the electric motor 12 and an end face distant from the electric motor 12.
• the first cylinder chamber 31 is a space inside the first cylinder 32, and closed by the main bearing 16 and the partition plate 29.
• the first cylinder chamber 31 houses the first eccentric portion 25a of the crank shaft 15.
• the second cylinder chamber 41 is a space inside the second cylinder 42, and closed by the partition plate 29 and the auxiliary bearing 17.
• the second cylinder chamber 41 houses the second eccentric portion 25b of the crank shaft 15.
• the compression mechanism 13 includes a first discharge valve mechanism including a discharge port that is disposed on the main bearing 16 to discharge the refrigerant compressed inside the first cylinder chamber 31 to the outside of the first cylinder chamber 31 and a discharge valve that is disposed on the main bearing 16 to open and close the discharge port, and a first discharge muffler 55 that is disposed on the main bearing 16 to cover the first discharge valve mechanism.
• the discharge valve of the first discharge valve mechanism opens the discharge port when a differential pressure between an inside and an outside of the first cylinder chamber 31 reaches a predetermined differential pressure value in association with compression action of the compression mechanism 13, and discharges the compressed refrigerant into the first discharge muffler 55.
• the first discharge muffler 55 and the first cylinder 32 are fixed to the main bearing 16 by a plurality of fastening members, for example, the bolts 52.
• the bolt 52 passes through the first discharge muffler 55 and the main bearing 16 to reach the first cylinder 32.
• the discharge port of the second discharge valve mechanism is connected to the second cylinder chamber 41.
• the second discharge muffler 57 covers the second discharge valve mechanism.
• the compressed refrigerant discharged into the second discharge muffler 57 is guided to the first discharge muffler 55 through a hole passing through the auxiliary bearing 17, the second cylinder 42, the partition plate 29, and the first cylinder 32, and discharged into the sealed container 11.
• the second discharge muffler 57, the auxiliary bearing 17, the second cylinder 42, and the partition plate 29 are fixed to the first cylinder 32 by a plurality of fastening members, for example, bolts 58.
• the bolt 58 passes through the second discharge muffler 57, the auxiliary bearing 17, the second cylinder 42, and the partition plate 29 to reach the first cylinder 32.
• the first piston 33 is engaged with a peripheral surface of the first eccentric portion 25a and housed in the first cylinder chamber 31.
• the first piston 33 eccentrically moves while causing part of the outer peripheral surface to be in line contact with an inner peripheral surface of the first cylinder chamber 31 in association with rotation of the crank shaft 15.
• the accumulator 7 is fixed to the sealed container 11 of the compressor 2 with a clamp band 59.
• the container 61 is fixed to the sealed container 11 of the compressor 2 with the clamp band 59.
• the container 61 has a cylindrical shape.
• the container 61 includes a cylindrical-shaped drum 61a extending in the upper and lower direction, a hemispherical-shaped or elliptical-shaped upper end plate 61b that blocks an upper end portion as one end portion of the drum 61a, and a hemispherical-shaped or elliptical-shaped lower end plate 61c that blocks a lower end portion as another end portion of the drum 61a.
• the drum 61a supports the strainer 71, the separation plate 72, the supporting plate 73, and the partition plate 62 in order corresponding to flow of the refrigerant.
• the upper end plate 61b supports the inlet pipe 63 that causes the refrigerant compressed by the compressor 2 and circulated through the refrigeration cycle apparatus 1 to flow into the accumulator 7.
• the inlet pipe 63 is connected to the refrigerant piping 8.
• the inlet pipe 63 is fixed to the upper end plate 61b and connected to the refrigerant piping 8.
• the inlet pipe 63 is a straight pipe extending along a center line of the drum 61a, and is a straight pipe extending to agree with the center line of the drum 61a.
• the supporting plate 73 and the partition plate 62 cooperate with each other to support at least one communication pipe 65 inside the container 61.
• the supporting plate 73 and the partition plate 62 cooperate with each other to collectively support all of the communication pipes 65 inside the container 61.
• the supporting plate 73 includes a hole that supports the communication pipe 65 and an appropriate opening that does not hinder circulation of the liquid refrigerant and the gas refrigerant so that the refrigerant introduction chamber IR becomes a continuous space.
• the supporting plate 73 preferably has appropriate supporting strength and supporting rigidity to prevent the communication pipe 65 extending from the partition plate 62 toward the separation plate 72 from falling down.
• the partition plate 62 does not have an opening other than the hole for supporting the communication pipe 65 so that the internal space S of the container 61 is divided into the refrigerant introduction chamber IR and the refrigerant discharge chamber OR.
• the partition plate 62 is liquid-tightly and air-tightly joined to the inner surface of the container 61 to hinder the refrigerant from flowing out from the refrigerant introduction chamber IR to the refrigerant discharge chamber OR through a route other than the communication pipe 65. It is sufficient that the partition plate 62 includes a plane orthogonal to the center line of the container 61, and the partition plate 62 defines a plane extending in a horizontal direction in the upright state of the accumulator 7.
• Each of the communication pipes 65 includes an inlet opening 65i disposed in the refrigerant introduction chamber IR, and an outlet opening 65o disposed in the refrigerant discharge chamber OR.
• the inlet opening 65i corresponds to an upstream end of the communication flow channel CP
• the outlet opening 65o corresponds to a downstream end of the communication flow channel CP.
• a length of each of the communication pipes 65 depends on a refrigerant enclosed amount of the refrigeration cycle apparatus 1, and is preferably about a half or more of a total length of the accumulator 7.
• At least one communication pipe 65 includes at least one introduction-side refrigerating machine oil return hole 65d disposed in the refrigerant introduction chamber IR. At least one introduction-side refrigerating machine oil return hole 65d is required. The introduction-side refrigerating machine oil return hole 65d may be provided on all of the communication pipes 65, or may be provided on some of the communication pipes 65. If at least one communication pipe 65 includes at least one introduction-side refrigerating machine oil return hole 65d, there may be the communication pipe 65 without the introduction-side refrigerating machine oil return hole 65d. Each of the communication pipes 65 may include a plurality of introduction-side refrigerating machine oil return holes 65d. The numbers of the introduction-side refrigerating machine oil return holes 65d included in the respective communication pipes 65 may be different from each other.
• Each of the outlet pipes 66 is the suction pipe 8b of the compressor 2, and connected to corresponding one of the cylinder chambers 31 and 41 of the rotor-cylinder assemblies 26 and 27 of the compression mechanism 13.
• the number of the outlet pipes 66 is the same as the number of cylinders of the compressor 2.
• the accumulator 7 is connected to the compressor 2 with the same number of outlet pipes 66 as the number of cylinders.
• the accumulator 7 may be connected to the compressor 2 with one outlet pipe 66.
• the accumulator 7 may include at least one outlet pipe 66, and preferably includes the same number of the outlet pipes 66 as the number of cylinders of the compressor 2.
• the inlet openings 66i of the outlet pipes 66 face the partition plate 62 positioned above, and the outlet openings 65o of the communication pipes 65 face the lower end plate 61c positioned below.
• the accumulator 7 does not cause the liquid refrigerant to flow into the refrigerant discharge chamber OR. If the liquid level of the liquid refrigerant accumulated in the refrigerant introduction chamber IR reaches the inlet openings 65i of the communication pipes 65, the liquid refrigerant falls down in the communication pipe 65, and is accumulated on a bottom of the container 61, that is, on the side of the lower end plate 61c.
• a specific gravity of the refrigerating machine oil is larger than a specific gravity of the refrigerant, and the refrigerating machine oil is accumulated to be closer to the bottom side of the refrigerant introduction chamber IR than the refrigerant.
• the accumulator 7 causes the refrigerating machine oil to flow out from the refrigerant introduction chamber IR to the refrigerant discharge chamber OR through the communication pipe 65.
• the refrigerating machine oil flowed out to the refrigerant discharge chamber OR is accumulated on the bottom of the container 61, that is, on a bottom of the lower end plate 61c.
• the accumulator 7 causes the refrigerating machine oil to flow out from the refrigerant discharge chamber OR to the compressor 2 through the outlet pipe 66.
• the sum total ⁇ Aod of the opening area of the discharge-side refrigerating machine oil return holes 66d is obtained by adding up opening areas Aod of the respective discharge-side refrigerating machine oil return holes 66d.
• the opening areas Aod of the discharge-side refrigerating machine oil return holes 66d may be the same, or may be different from each other. In other words, the discharge-side refrigerating machine oil return holes 66d may have the same opening diameter, or may have different opening diameters.
• the discharge-side refrigerating machine oil return holes 66d may have the same opening diameter. In a case in which a desired sum total ⁇ Aod of the opening areas can be obtained by combining the discharge-side refrigerating machine oil return holes 66d having different opening diameters, the discharge-side refrigerating machine oil return holes 66d may have different opening diameters.
• the sum total ⁇ Aod of the opening areas of the discharge-side refrigerating machine oil return holes 66d is the opening area Aod of the one discharge-side refrigerating machine oil return hole 66d.
• the following also describes a sum total ⁇ Aip of a cross-sectional area of the inlet flow channel IP, a sum total ⁇ Acp of cross-sectional areas of communication flow channels CP, and a sum total ⁇ Aop of cross-sectional areas of outlet flow channels OP.
• the sum total ⁇ Aip of the cross-sectional area of the inlet flow channel IP is substantially equal to the cross-sectional area Aip of the one inlet pipe 63.
• the sum total ⁇ Acp of the cross-sectional areas of the communication flow channels CP is obtained by adding up cross-sectional areas Acp of the respective communication pipes 65.
• the cross-sectional areas Acp of the communication pipes 65 may be the same, or may be different from each other.
• the communication pipes 65 may be a plurality of pipes having the same inner diameter, or may be a plurality of pipes having different inner diameters.
• the communication pipes 65 may have the same inner diameter.
• the communication pipes 65 may have different inner diameters.
• the sum total ⁇ Acp of the cross-sectional area of the communication pipes 65 is the cross-sectional area Acp of the one communication pipe 65.
• the sum total ⁇ Aop of the cross-sectional areas of the outlet flow channels OP is obtained by adding up cross-sectional areas Aop of the respective outlet pipes 66.
• the cross-sectional areas Aop of the outlet pipes 66 may be the same, or may be different from each other. In other words, the outlet pipes 66 may be a plurality of pipes having the same inner diameter, or may be a plurality of pipes having different inner diameters.
• the cross-sectional area Aop of each of the outlet pipes 66 depends on effective capacity of corresponding one of the rotor-cylinder assemblies 26 and 27. In a case in which the accumulator 7 includes only one outlet pipe 66, the sum total ⁇ Aop of the cross-sectional areas of the outlet pipes 66 is the cross-sectional area Aop of the one outlet pipe 66.
• the sum total ⁇ Acp of the cross-sectional areas of the communication flow channels CP is larger than the sum total ⁇ Aop of the cross-sectional areas of the outlet flow channels OP
• a distance Lc from the inlet opening 65i of the communication pipe 65 to the introduction-side refrigerating machine oil return hole 65d is longer than a distance Lo from the inlet opening 66i of the outlet pipe 66 to the discharge-side refrigerating machine oil return hole 66d
• the sum total ⁇ Aod of the opening areas of the discharge-side refrigerating machine oil return holes 66d is equal to or larger than the sum total ⁇ Acd of the opening areas of the introduction-side refrigerating machine oil return holes 65d.
• the sum total ⁇ Aod of the opening areas of the discharge-side refrigerating machine oil return holes 66d may be the same as the sum total ⁇ Acd of the opening areas of the introduction-side refrigerating machine oil return holes 65d.
• a larger number of the discharge-side refrigerating machine oil return holes 66d than the introduction-side refrigerating machine oil return holes 65d may be provided so that the sum total ⁇ Aod of the opening areas of the discharge-side refrigerating machine oil return holes 66d is equal to or larger than the sum total ⁇ Acd of the opening areas of the introduction-side refrigerating machine oil return holes 65d.
• a large number of the discharge-side refrigerating machine oil return holes 66d may be drilled on the outlet pipe 66, and a small number of the introduction-side refrigerating machine oil return holes 65d may be drilled on the communication pipe 65.
• the number of the discharge-side refrigerating machine oil return holes 66d may be larger than the number of the introduction-side refrigerating machine oil return holes 65d.
• the opening diameter of the discharge-side refrigerating machine oil return hole 66d may be larger than the opening diameter of the introduction-side refrigerating machine oil return hole 65d.
• Fig. 5 is a diagram for comparing the accumulator according to the present embodiment with a conventional accumulator in the supercharging effect.
• a conventional accumulator as a comparative example in Fig. 5 does not include the communication pipe 65 and the partition plate 62 of the accumulator 7 according to the present embodiment, but includes the outlet pipe 66 and the supporting plate 73 supporting the outlet pipe 66, the outlet pipe 66 projecting from the lower end plate 61c to the internal space S of the container 61 to extend to a vicinity of the separation plate 72, and having the inlet opening 66i facing the separation plate 72.
• a length of a straight pipe portion of the outlet pipe 66 inside the container 61 is assumed to be 0.35 times the length of the straight pipe portion of the outlet pipe 66 inside the container 61 according to the present embodiment.
• the accumulators 7 and 7A, the compressor 2, and the refrigeration cycle apparatus 1 also include a plurality of the discharge-side refrigerating machine oil return holes 66d arranged in the extending direction of at least one outlet pipe 66.
• the accumulators 7 and 7A, the compressor 2, and the refrigeration cycle apparatus 1 enhance oil returning capability of the downstream-side route for causing the refrigerating machine oil to flow out from the refrigerant discharge chamber OR to the compressor 2 accordingly, and can more securely prevent the refrigerating machine oil from overflowing from the inlet opening 66i of the outlet pipe 66.
• the accumulators 7 and 7A, the compressor 2, and the refrigeration cycle apparatus 1 according to the present embodiments can be installed so that the inlet opening 66i of at least one outlet pipe 66 is placed above the outlet opening 65o of at least one communication pipe 65, and the inlet opening 66i of at least one outlet pipe 66 does not overlap the outlet opening 65o of at least one communication pipe 65 in the vertical direction.
• the compressor 2 and the refrigeration cycle apparatus 1 according to the present embodiments include the accumulators 7 and 7A that are installed so that the inlet opening 66i of at least one outlet pipe 66 is placed above the outlet opening 65o of at least one communication pipe 65, and the inlet opening 66i of at least one outlet pipe 66 does not overlap the outlet opening 65o of at least one communication pipe 65 in the vertical direction.
• the accumulators 7 and 7A, the compressor 2, and the refrigeration cycle apparatus 1 can easily achieve both of prevention of liquid compression in the compressor 2, and a practical use of the supercharging effect by adjusting the piping length of the suction piping system of the compressor 2 including the outlet pipe 66 and the communication pipe 65 as illustrated in Fig. 5 .
• the accumulators 7 and 7A according to the present embodiment also include a plurality of the communication pipes 65 whose inlet openings 65i can be placed at substantially the same height.
• the compressor 2 and the refrigeration cycle apparatus 1 according to the present embodiments include a plurality of the communication pipes 65 whose inlet openings 65i are placed at substantially the same height.
• the accumulators 7 and 7A, the compressor 2, and the refrigeration cycle apparatus 1 prevent the liquid refrigerant flowing out from the communication flow channel CP to the refrigerant discharge chamber OR from directly flowing out from the inlet opening 66i of the outlet pipe 66 to the outlet flow channel OP.
• the communication pipes 65 can easily adjust a total pressure loss of a plurality of the communication flow channels CP by causing the communication flow channels CP to be individually different from each other or to be the same.
• the accumulators 7 and 7A, the compressor 2, and the refrigeration cycle apparatus 1 include a plurality of the outlet pipes 66.
• the accumulators 7 and 7A, the compressor 2, and the refrigeration cycle apparatus 1 can easily cope with the multi-cylinder compressor 2.
• the accumulators 7 and 7A, the compressor 2, and the refrigeration cycle apparatus 1 preferably include at least one communication pipe 65 in which the sum total ⁇ Acp of the cross-sectional areas Acp is equal to or larger than the sum total ⁇ Aip of the cross-sectional area Aip of the inlet flow channel IP and 1.2 times or more the sum total ⁇ Aop of the cross-sectional areas Aop of the outlet flow channels OP.
• the accumulators 7 and 7A, the compressor 2, and the refrigeration cycle apparatus 1 improve gas-liquid separation capacity of the accumulators 7 and 7A and accelerate a practical use of the supercharging effect without hindering flow of the refrigerant in the accumulators 7 and 7A due to a pressure loss of at least one communication pipe 65 connecting the refrigerant introduction chamber IR with the refrigerant discharge chamber OR.
• the accumulators 7 and 7A, the compressor 2, and the refrigeration cycle apparatus 1 can achieve both of gas-liquid separation capacity that can securely prevent the liquid refrigerant from flowing out, in other words, gas-liquid separation capacity that can securely prevent liquid compression in the compressor 2, and adjustment of the oil return flow rate for returning the caught refrigerating machine oil to the compressor 2 at an appropriate flow rate.

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• Engineering & Computer Science (AREA)
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Citations (4)

• 2024
  • 2024-05-30 JP JP2024087783A patent/JP2025180442A/ja active Pending
• 2025
  • 2025-05-19 CN CN202510642071.XA patent/CN121048315A/zh active Pending
  • 2025-05-26 EP EP25178778.4A patent/EP4664037A1/fr active Pending
  • 2025-05-28 US US19/220,835 patent/US20250369667A1/en active Pending

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