Accumulator, compressor, and refrigeration cycle apparatus

Abstract

To provide an accumulator capable of surely preventing outflow of a liquid refrigerant.SOLUTION: The heat exchanger is provided with a partition plate 62 provided in a vessel 61 and dividing an internal space of the vessel 61 into a refrigerant introducing chamber IR and a refrigerant discharging chamber OR, an inlet pipe 66 fixed to the vessel 61 and having an inlet flow passage connected to the refrigerant introducing chamber IR and a connecting pipe 66 passing through the partition plate 62, an outlet opening 6 50 and an outlet flow passage OP connected to the refrigerant discharging chamber OR, and a deflecting part 75 provided in the refrigerant discharging chamber OR and intercepting a line of sight between the inlet opening 6 50 and the outlet opening 6 60 to deflect a direction of flow of the refrigerant so that the refrigerant flowing from the outlet opening 6 50 does not directly go to the inlet opening 6 60.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to an accumulator, a compressor, and a refrigeration cycle device. [Background technology]

[0002] To prevent liquid refrigerant from being supplied into the cylinder of the compressor and compressed, ie, to prevent liquid compression, an accumulator (gas-liquid separator) is known that is provided on the suction side of the compressor.

[0003] In order to ensure gas-liquid separation capability, a conventional accumulator includes a container, a partition plate that divides the internal space of the container into upper and lower sections, a straight pipe that extends vertically through the partition plate and opens into the bottom space, and an outlet pipe that opens into the bottom space and is led out from the underside of the container.

[0004] The lower end of the straight pipe, i.e., the outlet end of the straight pipe, is located near the partition plate, and the upper end of the outlet pipe, i.e., the inlet end of the outlet pipe, is located near the bottom plate of the container, i.e., the outlet end of the straight pipe is located above the inlet end of the outlet pipe. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 4-350479 Summary of the Invention [Problem to be solved by the invention]

[0006] In conventional accumulators, if liquid refrigerant flows into the bottom space of the container through the straight pipe, the liquid refrigerant can easily flow into the outlet pipe whose inlet end is near the bottom plate of the container, causing the compressor to enter liquid compression mode.

[0007] Therefore, an object of the present invention is to provide an accumulator having a gas-liquid separation capability that can reliably prevent the outflow of liquid refrigerant, in other words, a gas-liquid separation capability that can reliably prevent liquid compression in the compressor, a compressor equipped with this accumulator, and a refrigeration cycle device. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, an accumulator according to an embodiment of the present invention includes a container, a partition plate provided inside the container and dividing the internal space of the container into a refrigerant introduction chamber and a refrigerant discharge chamber, an inlet pipe fixed to the container and having an inlet flow path connected to the refrigerant introduction chamber, at least one communication pipe passing through the partition plate and having an outlet opening disposed in the refrigerant discharge chamber and a communication flow path connecting the refrigerant introduction chamber and the refrigerant discharge chamber, at least one outlet pipe fixed to the container and having an inlet opening disposed in the refrigerant discharge chamber and an outlet flow path connected to the refrigerant discharge chamber, and a deflection section provided inside the refrigerant discharge chamber to block the view between the outlet opening and the inlet opening and to deflect the flow direction of the refrigerant flowing from the outlet opening into the refrigerant discharge chamber so that the refrigerant does not flow directly toward the inlet opening.

[0009] In order to solve the above-mentioned problems, a compressor according to an embodiment of the present invention includes a sealed container, a compression mechanism housed in the sealed container, an electric motor housed in the sealed container and generating a driving force for the compression mechanism, and the accumulator disposed outside the sealed container and connected to the suction side of the compression mechanism.

[0010] Furthermore, in order to solve the above-mentioned problems, the refrigeration cycle device according to an embodiment of the present invention includes the compressor, a radiator, an expansion device, a heat absorber, and a refrigerant pipe that connects the compressor, the radiator, the expansion device, and the heat absorber and allows the refrigerant to circulate. [Brief explanation of the drawings]

[0011] [Figure 1]1 is a schematic diagram of a refrigeration cycle device, a compressor, and an accumulator according to a first embodiment of the present invention. [Figure 2] FIG. 5 is a schematic diagram of a refrigeration cycle device, a compressor, and an accumulator according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] An accumulator, a compressor, and a refrigeration cycle device according to an embodiment of the present invention will be described with reference to Figures 1 and 2. Note that the same or corresponding components are denoted by the same reference numerals throughout the drawings.

[0013] [First embodiment] A first embodiment of an accumulator according to the present invention will be described with reference to FIG.

[0014] FIG. 1 is a schematic diagram of a refrigeration cycle device, a compressor, and an accumulator according to a first embodiment of the present invention.

[0015] As shown in FIG. 1, the refrigeration cycle apparatus 1 according to this embodiment includes a rotary compressor 2, a radiator 3, an expansion device 5, a heat absorber 6, an accumulator 7, and a refrigerant pipe 8. Hereinafter, the rotary compressor 2 will be simply referred to as the "compressor 2." The refrigerant pipe 8 sequentially connects the compressor 2, the radiator 3, the expansion device 5, the heat absorber 6, and the accumulator 7, allowing the refrigerant to circulate. The refrigerant circulating through the refrigeration cycle apparatus 1 may be various refrigerants, such as carbon dioxide, R32, or a mixed refrigerant containing R32. The radiator 3 may also be called a condenser, and the heat absorber 6 may also be called an evaporator.

[0016] The compressor 2 includes a cylindrical sealed container 11 that is placed vertically, an electric motor 12 housed in the upper half of the sealed container 11, a compression mechanism 13 housed in the lower half of the sealed container 11, a crankshaft 15 that transmits the rotational driving force of the electric motor 12 to the compression mechanism 13, and a main bearing 16 and an auxiliary bearing 17 that cooperate to support the crankshaft 15 so that it can rotate freely.

[0017] The sealed container 11 is cylindrical and includes a cylindrical body 11a extending in the vertical direction, a hemispherical or elliptical upper head 11b that closes the upper end of the body 11a, and a hemispherical or elliptical lower head 11c that closes the lower end of the body 11a.

[0018] The body 11a supports a plurality of suction pipes 8b that guide the refrigerant to the compressor 2. The plurality of suction pipes 8b are connected to the accumulator 7. The plurality of suction pipes 8b are part of the refrigerant pipes 8.

[0019] The upper head 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 pipe 8. The upper head plate 11b also includes a sealed terminal portion 18 that supplies power to the electric motor 12.

[0020] The electric motor 12 generates a driving force that rotates the compression mechanism 13. The electric motor 12 is, for example, a permanent magnet synchronous motor (PMSM). The electric motor 12 includes a cylindrical stator 21 fixed to the inner wall of the sealed container 11, a rotor 22 disposed inside the stator 21 and fixed to the crankshaft 15, and a plurality of lead wires 23 that are drawn from the stator 21 and connected to the sealed terminal portion 18.

[0021] Rotor 22 includes a rotor core having magnet accommodating holes and permanent magnets accommodated in the magnet accommodating holes. Rotor 22 is rotatable relative to stator 21 and is fixed to crankshaft 15 so as to rotate integrally with it. The rotational centerlines of rotor 22 and crankshaft 15 substantially coincide with the centerline of stator 21.

[0022] The multiple output wires 23 are wiring that supplies power to the stator 21 through the sealed terminal portion 18, and are so-called lead wires. A plurality of output wires 23 are wired depending on the type of electric motor 12. When the output wires 23 are used in an open winding type, two wires are wired for each of the U phase, V phase, and W phase, for a total of six output wires 23. When the electric motor 12 is used in a star connection, one wire is wired for each of the U phase, V phase, and W phase, for a total of three output wires 23.

[0023] The crankshaft 15 connects the electric motor 12 and the compression mechanism 13. The crankshaft 15 transmits the driving force generated by the electric motor 12 to the compression mechanism 13.

[0024] An intermediate portion 15a of the crankshaft 15 connects the electric motor 12 and the compression mechanism 13, and is rotatably supported by a main bearing 16. A lower end portion 15b of the crankshaft 15 is rotatably supported by an auxiliary bearing 17. The main bearing 16 and the auxiliary bearing 17 are also part of the compression mechanism 13. In other words, the crankshaft 15 passes through the compression mechanism 13.

[0025] The crankshaft 15 also has multiple eccentric portions 25a, 25b between a middle portion 15a supported by the main bearing 16 and a lower end portion 15b supported by the sub-bearing 17. Of the multiple eccentric portions 25, the one closer to the main bearing 16 is called the first eccentric portion 25a, and the one closer to the sub-bearing 17 is called the second eccentric portion 25b. Each of the eccentric portions 25a, 25b is a disk or cylinder whose center does not coincide with the center of the crankshaft 15. The centers of the eccentric portions 25a, 25b are eccentric around the crankshaft 15 with a phase difference of approximately 180 degrees. The first eccentric portion 25a is located on the upper side closer to the electric motor 12, and the second eccentric portion 25b is located on the lower side farther from the electric motor 12.

[0026] The upper main bearing 16 is fixed to the frame 14 via the first cylinder 32 by a plurality of fastening members, for example, bolts 55 and 56. The frame 14 is fixed to the sealed casing 11 at a plurality of locations by welding, for example, spot welding. In other words, the frame 14 supports the compression mechanism 13, the crankshaft 15, and the rotor 22 of the electric motor 12 on the sealed casing 11.

[0027] The compression mechanism 13 is rotationally driven by the electric motor 12 connected via the crankshaft 15, thereby drawing in the gaseous refrigerant from the plurality of suction pipes 8b, compressing the drawn in refrigerant, and discharging the compressed refrigerant into the sealed container 11. The lower part of the sealed container 11 is filled with refrigeration oil, and most of the compression mechanism 13 is immersed in this refrigeration oil.

[0028] The compression mechanism 13 includes a plurality of cylinders, for example, two cylinders 26 and 27. In other words, the compressor 2 is a multi-cylinder rotary compressor. The compression mechanism 13 includes a first cylinder 26 provided in the sealed container 11, a second cylinder 27 provided in the sealed container 11, and a partition plate 29 provided between the first cylinder 26 and the second cylinder 27.

[0029] The compressor 2 may be a multi-cylinder rotary compressor having three or more cylinders, or may be a single-cylinder rotary compressor. The compressor 2 and the accumulator 7 are connected via suction pipes 8b, the number of which is the same as the number of cylinders.

[0030] The first cylinder 26 includes a first cylinder 32 having a circular first cylinder chamber 31, and an annular first rolling piston 33 disposed within the first cylinder chamber 31. Hereinafter, the first rolling piston 33 will be simply referred to as the "first piston 33."

[0031] The second cylinder 27 includes a second cylinder 42 having a circular second cylinder chamber 41, and an annular second rolling piston 43 disposed within the second cylinder chamber 41. Hereinafter, the second rolling piston 43 will be simply referred to as the "second piston 43."

[0032] Each cylinder 26, 27 is equipped with a vane 45 that reciprocates toward and away from the rotational centerline of the crankshaft 15 while remaining in contact with the outer circumferential surface of the corresponding piston 33, 43, dividing the corresponding cylinder chamber 31, 41 into a suction chamber and a compression chamber. The volume of the compression chamber defined by the corresponding piston 33, 43 and the corresponding vane 45 in each cylinder 26, 27 changes with the rotation of the piston 33, 43, compressing the refrigerant. Only the second cylinder 27 is shown with a vane 45.

[0033] The first cylinder 32 and the second cylinder 42 are arranged so as to be stacked in the axial direction of the crankshaft 15. The upper first cylinder 32 is arranged on the side closer to the electric motor 12. The lower second cylinder 42 is arranged on the side farther from the electric motor 12.

[0034] Each of the cylinders 32, 42 has an inner circumferential surface that defines a corresponding cylinder chamber 31, 41. Each of the cylinders 32, 42 has an annular, plate-like shape with the corresponding cylinder chamber 31, 41 inside. Each of the cylinders 32, 42 has an end face closer to the electric motor 12 and an end face farther from the electric motor 12.

[0035] The centers of the first cylinder chamber 31 and the second cylinder chamber 41 substantially coincide with the rotational centerline of the crankshaft 15. These cylinder chambers 31, 41 have substantially the same diameter and height, i.e., the dimensions in the longitudinal direction of the crankshaft 15. The first cylinder chamber 31 is the space inside the first cylinder 32 and is closed by the main bearing 16 and the partition plate 29. The first cylinder chamber 31 houses the first eccentric portion 25a of the crankshaft 15. The second cylinder chamber 41 is the space inside the second cylinder 42 and is closed by the partition plate 29 and the sub-bearing 17. The second cylinder chamber 41 houses the second eccentric portion 25b of the crankshaft 15.

[0036] The compression mechanism 13 includes a first discharge valve mechanism having a discharge port provided in the main bearing 16 for discharging the refrigerant compressed in the first cylinder chamber 31 to the outside of the first cylinder chamber 31, and a discharge valve provided in the main bearing 16 for opening and closing the discharge port, and a first discharge muffler 55 provided in the main bearing 16 for covering the first discharge valve mechanism.

[0037] The discharge port of the first discharge valve mechanism is connected to the first cylinder chamber 31 .

[0038] The discharge valve of the first discharge valve mechanism opens the discharge port when the differential pressure between the inside and outside of the first cylinder chamber 31 reaches a predetermined differential pressure value due to the compression action of the compression mechanism 13, and discharges the compressed refrigerant into the first discharge muffler 55.

[0039] The first discharge muffler 55 covers the first discharge valve mechanism. The first discharge muffler 55 has a discharge hole penetrating the first discharge muffler 55. The compressed refrigerant discharged into the first discharge muffler 55 is discharged into the sealed container 11 through the discharge hole.

[0040] 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, bolts 56. The bolts 56 pass through the first discharge muffler 55 and the main bearing 16 and reach the first cylinder 32.

[0041] The compression mechanism 13 also includes a second discharge valve mechanism having a discharge port provided in the sub-bearing 17 and discharging the refrigerant compressed in the second cylinder chamber 41, and a discharge valve provided in the sub-bearing 17 and opening and closing the discharge port, and a second discharge muffler 57 provided in the sub-bearing 17 and covering the second discharge valve mechanism.

[0042] The discharge port of the second discharge valve mechanism is connected to the second cylinder chamber 41 .

[0043] The discharge valve of the second discharge valve mechanism opens the discharge port when the differential pressure between the inside and outside of the second cylinder chamber 41 reaches a predetermined differential pressure value due to the compression action of the compression mechanism 13, and discharges the compressed refrigerant into the second discharge muffler 57.

[0044] The second discharge valve mechanism is covered with the second discharge muffler 57. The compressed refrigerant discharged into the second discharge muffler 57 is guided to the first discharge muffler 55 through a hole that penetrates the sub-bearing 17, the second cylinder 42, the partition plate 29, and the first cylinder 32, and is then discharged into the sealed container 11.

[0045] 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 bolts 58 pass through the second discharge muffler 57, the auxiliary bearing 17, the second cylinder 42, and the partition plate 29 and reach the first cylinder 32.

[0046] The first piston 33 is fitted onto the circumferential surface of the first eccentric portion 25a and is housed in the first cylinder chamber 31. As the crankshaft 15 rotates, the first piston 33 moves eccentrically while a portion of its outer circumferential surface is in line contact with the inner circumferential surface of the first cylinder chamber 31.

[0047] The second piston 43 is fitted onto the circumferential surface of the second eccentric portion 25b and is housed in the second cylinder chamber 41. As the crankshaft 15 rotates, the second piston 43 moves eccentrically while a portion of its outer circumferential surface is in line contact with the inner circumferential surface of the second cylinder chamber 41.

[0048] Note that the contact between the first piston 33 and the first cylinder 32 and the contact between the second piston 43 and the second cylinder 42 is not direct contact but indirect contact via an oil film (not shown), but for ease of explanation, this contact via an oil film will be simply referred to as "contact." The same applies to the contact between the first piston 33 and the first eccentric portion 25a, between the second piston 43 and the second eccentric portion 25b, between the first piston 33 and the main bearing 16, between the second piston 43 and the sub-bearing 17, between the first piston 33 and the partition plate 29, and between the second piston 43 and the partition plate 29.

[0049] The accumulator 7 is fixed to the sealed container 11 of the compressor 2 by a clamp band 59. The accumulator 7 includes a cylindrical container 61 supported in an upright position, a partition plate 62 provided inside the container 61 and dividing the internal space S of the container 61 into a refrigerant introduction chamber IR and a refrigerant discharge chamber OR, an inlet pipe 63 fixed to the container 61 and having an inlet flow path IP connected to the refrigerant introduction chamber IR, at least one communication pipe 65 passing through the partition plate 62 and having a communication flow path CP connecting the refrigerant introduction chamber IR and the refrigerant discharge chamber OR, and a plurality of outlet pipes 66 fixed to the container 61 and having an outlet flow path OP connected to the refrigerant discharge chamber OR.

[0050] The accumulator 7 also includes an inlet-side strainer 71 that is disposed between the inlet pipe 63 and the connecting pipe 65 and filters out foreign matter from the refrigerant introduced into the accumulator 7, an inlet-side separation plate 72 that is disposed between the inlet-side strainer 71 and the connecting pipe 65 and separates the refrigerant that has passed through the inlet-side strainer 71 into gas refrigerant and liquid refrigerant, and a support plate 73 that is disposed between the inlet-side separation plate 72 and the partition plate 62 and supports the connecting pipe 65 together with the partition plate 62. The inlet-side strainer 71, the inlet-side separation plate 72, and the support plate 73 are disposed within the refrigerant introducing chamber IR.

[0051] Furthermore, the accumulator 7 includes a deflector 75 arranged in the refrigerant discharge chamber OR.

[0052] The container 61 is fixed to the sealed container 11 of the compressor 2 by a clamp band 59. The container 61 is cylindrical and includes a cylindrical body 61a extending in the vertical direction, a hemispherical or elliptical upper head 61b that closes the upper end, which is one end of the body 61a, and a hemispherical or elliptical lower head 61c that closes the lower end, which is the other end of the body 61a.

[0053] The body 61a supports an inlet side strainer 71, an inlet side separation plate 72, a support plate 73, and a partition plate 62 in the order of the refrigerant flow.

[0054] The upper head plate 61b supports an inlet pipe 63 through which the refrigerant compressed by the compressor 2 and circulated through the refrigeration cycle device 1 flows into the accumulator 7. The inlet pipe 63 is connected to a refrigerant pipe 8.

[0055] The inlet pipe 63 is fixed to the upper head plate 61b and connected to the refrigerant pipe 8. The inlet pipe 63 is a straight pipe that extends along the center line of the body 61a, and is a straight pipe that extends in line with the center line of the body 61a.

[0056] The refrigerant flowing into the accumulator 7 from the inlet pipe 63 first reaches the inlet strainer 71. The inlet strainer 71 has a required mesh size to prevent foreign matter from flowing into the compression mechanism 13 of the compressor 2.

[0057] The inlet-side separation plate 72 prevents the refrigerant that has passed through the inlet-side strainer 71 from flowing directly into the connecting pipe 65. The inlet-side separation plate 72 is a plate with an upwardly convex shape that acts like an umbrella on the connecting pipe 65. The inlet-side separation plate 72 has multiple openings 72a through which the refrigerant can pass. The inlet-side separation plate 72 blocks the view directly below the inlet pipe 63 and blocks the view directly above the connecting pipe 65. The multiple openings 72a of the inlet-side separation plate 72 are arranged outside the smallest imaginary circle that encompasses the multiple connecting pipes 65 when viewed from the inlet pipe 63. The refrigerant that has reached the inlet-side separation plate 72 flows down into the refrigerant introduction chamber IR of the container 61 through the multiple openings 72a of the inlet-side separation plate 72.

[0058] Each opening 72a opens toward the outer periphery of the inlet-side separation plate 72. In other words, each opening 72a opens in a direction facing the inner surface of the container 61. Each opening 72a is formed in a plate-shaped material by, for example, cutting and raising, and the inlet-side separation plate 72 has multiple quarter-spherical deflection plate portions 72b provided on the back side of each opening 72a, that is, closer to the center of the inlet-side separation plate 72 than each opening 72a, to guide the refrigerant flowing out from each opening 72a toward the inner surface of the container 61 and away from the connecting pipe 65.

[0059] The support plate 73 and the partition plate 62 cooperate to support at least one connecting pipe 65 inside the container 61. When there are multiple connecting pipes 65, the support plate 73 and the partition plate 62 cooperate to support all of the connecting pipes 65 collectively inside the container 61.

[0060] The support plate 73 has holes that support the connecting pipe 65 and appropriate openings that do not impede the flow of liquid refrigerant and gas refrigerant so that the refrigerant introduction chamber IR becomes a continuous space. The support plate 73 preferably has appropriate support strength and support rigidity so that the connecting pipe 65 extending from the partition plate 62 toward the inlet-side separation plate 72 does not tip over.

[0061] The partition plate 62 has no openings other than the hole that supports the connecting pipe 65, so that the internal space S of the container 61 is divided into a refrigerant introduction chamber IR and a refrigerant discharge chamber OR. The partition plate 62 is joined liquid-tight and airtight to the inner surface of the container 61, and prevents the refrigerant from flowing from the refrigerant introduction chamber IR to the refrigerant discharge chamber OR through any path other than the connecting pipe 65. The partition plate 62 only needs to have a plane that is perpendicular to the center line of the container 61, and defines a plane that extends horizontally when the accumulator 7 is in an upright position.

[0062] It is sufficient to have at least one communication pipe 65. For ease of explanation, the accumulator 7 of this embodiment is assumed to have a plurality of, for example, two, communication pipes 65. The number of communication pipes 65 is determined in consideration of the pressure loss in the communication flow path CP connecting the refrigerant introduction chamber IR and the refrigerant discharge chamber OR.

[0063] Each of the communication pipes 65 has 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 the upstream end of the communication flow path CP, and the outlet opening 65o corresponds to the downstream end of the communication flow path CP.

[0064] Each of the communication pipes 65 is disposed inside the container 61 and fixed to the support plate 73 and the partition plate 62, connecting the refrigerant introduction chamber IR and the refrigerant discharge chamber OR. Each of the communication pipes 65 is a straight pipe extending along the center line of the body 61a, and is a straight pipe extending parallel to the center line of the body 61a.

[0065] The length of each of the communication pipes 65 depends on the amount of refrigerant charged in the refrigeration cycle device 1, but is preferably approximately equal to or greater than half the total length of the accumulator .

[0066] Furthermore, at least one connecting pipe 65 has at least one introduction-side refrigeration oil return hole 65d arranged in the refrigerant introduction chamber IR. At least one introduction-side refrigeration oil return hole 65d is required. The introduction-side refrigeration oil return hole 65d may be provided in all connecting pipes 65, or may be provided in some connecting pipes 65. As long as at least one connecting pipe 65 has at least one introduction-side refrigeration oil return hole 65d, there may be a connecting pipe 65 that does not have an introduction-side refrigeration oil return hole 65d. Each connecting pipe 65 may have multiple introduction-side refrigeration oil return holes 65d. The number of introduction-side refrigeration oil return holes 65d provided in each connecting pipe 65 may be different.

[0067] Each outlet pipe 66 is the suction pipe 8b of the compressor 2, and is connected to the cylinder chambers 31, 41 of the corresponding cylinders 26, 27 of the compression mechanism 13. The number of outlet pipes 66 is the same as the number of cylinders of the compressor 2. In the case of a multi-cylinder compressor 2 as shown in FIG. 1, the accumulator 7 is connected to the compressor 2 by outlet pipes 66 in the same number as the number of cylinders. In the case of a single-cylinder compressor 2, it is sufficient for the accumulator 7 to be connected to the compressor 2 by one outlet pipe 66. In other words, it is sufficient for the accumulator 7 to have at least one outlet pipe 66, and it is preferable for the accumulator 7 to have the same number of outlet pipes 66 as the number of cylinders of the compressor 2.

[0068] Each outlet pipe 66 allows gas refrigerant separated from the refrigerant that has flowed into the accumulator 7 to flow out from the accumulator 7. Each outlet pipe 66 is fixed to the lower head 61c and connected to the compressor 2. The inner portion of the outlet pipe 66 in the container 61 is a straight pipe that extends along the center line of the body 61a and in parallel to the center line of the body 61a.

[0069] Each outlet pipe 66 has an inlet opening 66i disposed in the refrigerant discharge chamber OR and an outlet opening 66o connected to the corresponding cylinder chamber 31, 41. The inlet opening 66i corresponds to the upstream end of the outlet flow path OP, and the outlet opening 66o corresponds to the downstream end of the outlet flow path OP.

[0070] Furthermore, at least one outlet pipe 66 has at least one discharge-side refrigeration oil return hole 66d arranged in the refrigerant discharge chamber OR. At least one discharge-side refrigeration oil return hole 66d is required. The discharge-side refrigeration oil return hole 66d may be provided in all of the outlet pipes 66, or may be provided in some of the outlet pipes 66. As long as at least one outlet pipe 66 has at least one discharge-side refrigeration oil return hole 66d, there may be an outlet pipe 66 that does not have a discharge-side refrigeration oil return hole 66d. Each outlet pipe 66 may have multiple discharge-side refrigeration oil return holes 66d. The number of discharge-side refrigeration oil return holes 66d provided in each outlet pipe 66 may be different.

[0071] The deflection portion 75 is disposed in the refrigerant discharge chamber OR and blocks the line of sight between the outlet openings 65o of each connecting pipe 65 and the inlet openings 66i of all outlet pipes 66. In this way, the deflection portion 75 deflects the flow direction of the refrigerant flowing into the refrigerant discharge chamber OR from the outlet openings 65o of each connecting pipe 65 so that the refrigerant does not flow directly toward the inlet openings 66i of each outlet pipe 66.

[0072] The deflection section 75 includes an outlet side strainer 78 that is arranged between the connecting pipe 65 and the outlet pipe 66 and filters out foreign matter from the refrigerant flowing out from the connecting pipe 65, and an outlet side separation plate 79 that is arranged between the outlet side strainer 78 and the outlet pipe 66 and separates the refrigerant that has passed through the outlet side strainer 78 into gas refrigerant and liquid refrigerant.

[0073] The outlet-side separation plate 79 is a so-called baffle plate that deflects the flow direction of the refrigerant flowing from the outlet opening 65o of the connecting pipe 65 into the refrigerant discharge chamber OR so that the refrigerant does not flow directly toward the inlet opening 66i of the outlet pipe 66. In other words, the outlet-side separation plate 79 functions as an obstacle or deflector located between the outlet opening 65o and the inlet opening 66i. The outlet-side separation plate 79 is a plate with an upward convex shape that acts like an umbrella on the outlet pipe 66. The outlet-side separation plate 79 has multiple openings 79a through which the refrigerant can pass. The outlet-side separation plate 79 blocks the view directly below the connecting pipe 65 and blocks the view directly above the outlet pipe 66. The multiple openings 79a of the outlet-side separation plate 79 are located outside the smallest imaginary circle that encompasses the multiple outlet pipes 66 when viewed from the connecting pipe 65. The refrigerant that has reached the outlet-side separation plate 79 flows down into the refrigerant discharge chamber OR of the container 61 through the multiple openings 79 a of the outlet-side separation plate 79 .

[0074] Each opening 79a opens toward the outer periphery of the outlet-side separation plate 79. In other words, each opening 79a opens in a direction facing the inner surface of the container 61. Each opening 79a is formed in a plate-shaped material by, for example, cutting and raising, and the outlet-side separation plate 79 has a plurality of quarter-spherical deflection plate portions 79b provided on the back side of each opening 79a, that is, closer to the center of the outlet-side separation plate 79 than each opening 79a, to guide the refrigerant flowing out from each opening 79a toward the inner surface of the container 61 and away from the outlet pipe 66.

[0075] The inlet openings 66i of the outlet pipes 66 face the outlet-side separation plate 79 upward, and the outlet openings 65o of the connection pipes 65 face the outlet-side separation plate 79 downward.

[0076] The inlet openings 65i of the plurality of connecting pipes 65 are closer to the upper head plate 61b than to the partition plate 62, and the inlet openings 66i of the plurality of outlet pipes 66 are closer to the partition plate 62 than to the lower head plate 61c.

[0077] The inlet openings 65i of each of the connecting pipes 65 are arranged at substantially the same height. In other words, the accumulator 7 is configured so that the inlet openings 65i of the multiple connecting pipes 65 can be arranged at substantially the same height. Furthermore, the inlet openings 66i of each of the outlet pipes 66 are arranged at substantially the same height. In other words, the accumulator 7 is configured so that the inlet openings 66i of the multiple outlet pipes 66 can be arranged at substantially the same height. When the inlet openings 65i of the multiple connecting pipes 65 are arranged at substantially the same height, the inlet openings 66i of the multiple outlet pipes 66 are also arranged at substantially the same height.

[0078] The vessel 61 is an assembly of three members that are divided and airtightly joined midway along the body 61a on the upper head plate 61b side and midway along the body 61a on the lower head plate 61c side. It is preferable that the inlet pipe 63, inlet strainer 71, and inlet separation plate 72 are assembled into the upper member before assembling the vessel 61, the outlet pipe 66 is assembled into the lower member before assembling the vessel 61, and the partition plate 62, support plate 73, and connecting pipe 65 are assembled into the central member before assembling the vessel 61. The support plate 73 may be located at the dividing surface between the upper and central members, or may be fixed to the inside of the central member.

[0079] The vessel 61 may be an assembly of two members that are split midway through the body 61a and joined airtightly. It is preferable that the inlet pipe 63, inlet strainer 71, and inlet separation plate 72 are assembled into the upper member before assembling the vessel 61, and the outlet pipe 66, partition plate 62, support plate 73, and connecting pipe 65 are assembled into the lower member before assembling the vessel 61. The support plate 73 may be disposed at the dividing surface of the two members, or may be fixed to the inside of the lower member.

[0080] When viewed in the direction along the center line of the container 61, the multiple outlet pipes 66 may be arranged so as not to overlap the multiple connecting pipes 65, or may be arranged so as to overlap the multiple connecting pipes 65. In other words, the accumulator 7 may be configured so that the multiple outlet pipes 66 can be installed so as not to overlap the multiple connecting pipes 65 in the vertical direction, or may be configured so that the multiple outlet pipes 66 can be installed so as to overlap the multiple connecting pipes 65. In other words, the accumulator 7 has a high degree of freedom in terms of the arrangement of the connecting pipes 65 and the outlet pipes 66.

[0081] In the accumulator 7 configured as described above, the refrigerant flowing down from the inlet pipe 63 into the refrigerant introduction chamber IR in the container 61 hits the inlet-side separation plate 72 and is separated into gas refrigerant and liquid refrigerant. The separated liquid refrigerant flows further down within the refrigerant introduction chamber IR from the opening 72a of the inlet-side separation plate 72 and accumulates at the bottom of the refrigerant introduction chamber IR, that is, on the partition plate 62 side. Meanwhile, the separated gas refrigerant flows from the opening 72a of the inlet-side separation plate 72 through the multiple connection pipes 65 into the refrigerant discharge chamber OR. The gas refrigerant that has flowed into the refrigerant discharge chamber OR is sucked into the outlet pipe 66 and sent to the compressor 2.

[0082] The accumulator 7 does not allow the liquid refrigerant accumulated in the refrigerant introduction chamber IR to flow into the refrigerant discharge chamber OR unless the level of the liquid refrigerant accumulated in the refrigerant introduction chamber IR reaches the inlet openings 65i of the plurality of connecting pipes 65. Even if the level of the liquid refrigerant accumulated in the refrigerant introduction chamber IR reaches the inlet openings 65i of the plurality of connecting pipes 65, the liquid refrigerant flows down the connecting pipe 65 and hits the outlet-side separator plate 79, where it is separated into gas refrigerant and liquid refrigerant. The separated liquid refrigerant flows further down the refrigerant discharge chamber OR from the opening 79a of the outlet-side separator plate 79 and accumulates at the bottom of the refrigerant discharge chamber OR, which is also the bottom of the container 61, i.e., on the lower end plate 61c side. Again, the accumulator 7 does not allow the liquid refrigerant accumulated in the refrigerant discharge chamber OR to flow into the outlet pipe 66 unless the level of the liquid refrigerant accumulated in the refrigerant discharge chamber OR reaches the inlet openings 66i of the plurality of outlet pipes 66. In this way, the accumulator 7 can prevent liquid compression in the compressor 2 multiple times.

[0083] As described above, the accumulator 7, compressor 2, and refrigeration cycle apparatus 1 according to this embodiment include the partition plate 62 that is provided inside the container 61 and divides the internal space of the container 61 into the refrigerant introduction chamber IR and the refrigerant discharge chamber OR, and the deflector 75 that blocks the view between the outlet opening 65o of the connecting pipe 65 and the inlet opening 66i of the outlet pipe 66 and deflects the direction of the refrigerant flow so that the refrigerant flowing from the outlet opening 65o of the connecting pipe 65 into the refrigerant discharge chamber OR does not flow directly toward the inlet opening 66i of the outlet pipe 66. Therefore, the accumulator 7, compressor 2, and refrigeration cycle apparatus 1 can accumulate liquid refrigerant in multiple stages in the refrigerant introduction chamber IR and the refrigerant discharge chamber OR in the accumulator 7, even if the liquid refrigerant returns to the accumulator 7. Furthermore, the accumulator 7, the compressor 2, and the refrigeration cycle device 1 use the deflection portion 75 to prevent the liquid refrigerant from flowing directly into the outlet pipe 66, even if the liquid refrigerant overflows from the refrigerant introduction chamber IR to the refrigerant discharge chamber OR through the connecting pipe 65. This prevents the liquid refrigerant from easily flowing out of the outlet pipe 66, and ultimately prevents liquid compression in the compressor 2.

[0084] The accumulator 7, compressor 2, and refrigeration cycle apparatus 1 according to this embodiment also include an outlet-side separation plate 79 serving as a baffle plate provided in the refrigerant discharge chamber OR. That is, the accumulator 7, compressor 2, and refrigeration cycle apparatus 1 include an outlet-side separation plate 79 between the connecting pipe 65 and the outlet pipe 66, which has a configuration similar to the inlet-side separation plate 72 provided in a typical accumulator. Therefore, the accumulator 7, compressor 2, and refrigeration cycle apparatus 1 can achieve a gas-liquid separation capability capable of reliably preventing the outflow of liquid refrigerant while simplifying the design and standardizing the components. In other words, the accumulator 7, compressor 2, and refrigeration cycle apparatus 1 according to this embodiment also achieve a gas-liquid separation capability capable of reliably preventing liquid refrigerant from being compressed by the compressor 2. The accumulator 7, compressor 2, and refrigeration cycle apparatus 1 according to this embodiment also have a high degree of design freedom in optimizing the length of the outlet pipe 66 to the capacity of the compression mechanism. By optimizing the length of the outlet pipe 66 to the compression mechanism, a supercharging effect can be achieved, thereby increasing capacity.

[0085] [Second embodiment] A second embodiment of the accumulator according to the present invention will be described with reference to FIG.

[0086] FIG. 2 is a schematic diagram of a refrigeration cycle device, a compressor, and an accumulator according to a second embodiment of the present invention.

[0087] In the accumulator 7A according to this embodiment, the same components as those of the accumulator 7 according to the first embodiment are denoted by the same reference numerals, and redundant explanations will be omitted.

[0088] As shown in FIG. 2, the accumulator 7A according to this embodiment includes a deflection portion 75A disposed in the refrigerant discharge chamber OR.

[0089] The deflection portion 75A is disposed in the refrigerant discharge chamber OR and blocks the line of sight between the outlet openings 65o of each connecting pipe 65 and the inlet openings 66i of all outlet pipes 66. In this way, the deflection portion 75A deflects the flow direction of the refrigerant flowing into the refrigerant discharge chamber OR from the outlet openings 65o of each connecting pipe 65 so that the refrigerant does not flow directly toward the inlet openings 66i of each outlet pipe 66.

[0090] The deflection section 75A is a plurality of bent pipe sections 81 provided at the end of each connecting pipe 65 that is disposed in the refrigerant discharge chamber OR, i.e., at the outlet end 65oe having the outlet opening 65o. Each bent pipe section 81 is a so-called elbow provided at the outlet end 65oe of each connecting pipe 65. Each bent pipe section 81 directs the outflow direction of the outlet end 65oe of each connecting pipe 65 toward the inner surface of the container 61. In other words, the outlet opening 65o of the connecting pipe 65 is located outside the smallest imaginary circle that encompasses the plurality of outlet pipes 66 when viewed from the connecting pipe 65.

[0091] Each bent pipe section 81 is preferably bent smoothly so as not to obstruct the flow of refrigerant flowing through the communication flow path CP of each communication pipe 65. However, the deflection section 75A may be bent sharply as long as it does not obstruct the flow of refrigerant flowing through the communication flow path CP of each communication pipe 65, or may be closed like a lid at the outlet end 65oe of each communication pipe 65, with an outlet opening 65o provided on the side of the communication pipe 65.

[0092] In the accumulator 7A configured as described above, the accumulator 7A does not allow the liquid refrigerant accumulated in the refrigerant introduction chamber IR to flow into the refrigerant discharge chamber OR unless the liquid level of the liquid refrigerant accumulated in the refrigerant introduction chamber IR reaches the inlet openings 65i of the plurality of communication pipes 65. Furthermore, if the liquid level of the liquid refrigerant accumulated in the refrigerant introduction chamber IR reaches the inlet openings 65i of the plurality of communication pipes 65, the liquid refrigerant flows down the communication pipe 65 and flows out from the outlet openings 65o of the communication pipe 65 toward the inner surface of the container 61, where it is separated into gas refrigerant and liquid refrigerant. The separated liquid refrigerant flows further down the inner surface of the container 61 within the refrigerant discharge chamber OR and accumulates at the bottom of the refrigerant discharge chamber OR, which is also the bottom of the container 61, that is, on the side of the lower end panel 61c. Again, the accumulator 7A does not allow the liquid refrigerant to flow into the outlet pipes 66 unless the liquid level of the liquid refrigerant accumulated in the refrigerant discharge chamber OR reaches the inlet openings 66i of the multiple outlet pipes 66. In this way, the accumulator 7A can prevent liquid compression of the compressor 2 multiple times.

[0093] Furthermore, in the accumulator 7A, the outlet pipes 66 and the connecting pipes 65 can be arranged alternately in the circumferential direction of the container 61, and the connecting pipes 65 and the outlet pipes 66 can be arranged so as to overlap when viewed in the radial direction of the container 61. Such an arrangement relationship between the connecting pipes 65 and the outlet pipes 66 can contribute to reducing the overall height of the accumulator 7A.

[0094] As described above, the accumulators 7, 7A, compressor 2, and refrigeration cycle apparatus 1 according to this embodiment include a bent pipe portion 81 provided at the end of the connecting pipe 65 located in the refrigerant discharge chamber OR. At least one connecting pipe 65 is required. That is, the accumulators 7, 7A according to this embodiment include a bent pipe portion 81 provided at the end of at least one connecting pipe 65 located in the refrigerant discharge chamber OR. Therefore, the accumulators 7, 7A, compressor 2, and refrigeration cycle apparatus 1 can achieve a gas-liquid separation capability that reliably prevents the outflow of liquid refrigerant with a very simple design and a small number of parts. In other words, a gas-liquid separation capability that reliably prevents liquid compression in the compressor 2. The accumulators 7, 7A, compressor 2, and refrigeration cycle apparatus 1 according to this embodiment have a high degree of design freedom in optimizing the length of the outlet pipe 66 to the capacity of the compression mechanism. By optimizing the length of the outlet pipe 66 for the compression mechanism, a supercharging effect can be achieved, thereby increasing capacity.

[0095] Therefore, the accumulators 7, 7A, compressor 2, and refrigeration cycle device 1 according to this embodiment have a gas-liquid separation capability that can reliably prevent the outflow of liquid refrigerant, in other words, a gas-liquid separation capability that can reliably prevent liquid compression of the compressor 2.

[0096] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0097] 1... refrigeration cycle device, 2... rotary compressor, 3... radiator, 5... expansion device, 6... heat sink, 7, 7A... accumulator, 8... refrigerant pipe, 8b... suction pipe, 8a... discharge pipe, 11... sealed container, 11a... shell, 11b... upper head plate, 11c... lower head plate, 12... electric motor, 13... compression mechanism, 14... frame, 15... crankshaft, 15a... intermediate portion, 15b... lower end portion, 16... main Bearing, 17... auxiliary bearing, 18... sealed terminal portion, 21... stator, 22... rotor, 23... lead wire, 25... eccentric portion, 25a... first eccentric portion, 25b... second eccentric portion, 26... first cylinder, 27... second cylinder, 29... partition plate, 31... first cylinder chamber, 32... first cylinder, 33... first rolling piston, 41... second cylinder chamber, 42... second cylinder, 43... second rolling piston ing piston, 45... vane, 55... first discharge muffler, 55, 56... bolt, 57... second discharge muffler, 58... bolt, 59... clamp band, 61... container, 61a... shell, 61b... upper head plate, 61c... lower head plate, 62... partition plate, 63... inlet pipe, 65... connecting pipe, 65i... inlet opening, 65o... outlet opening, 65d... inlet side refrigeration oil return hole, 65oe... outlet side end, 6 6...Outlet pipe, 66i...Inlet opening, 66o...Outlet opening, 66d...Discharge side refrigerating machine oil return hole, 66d2...Second discharge side refrigerating machine oil return hole, 71...Inlet side strainer, 72...Inlet side separation plate, 72 a...Opening, 72b...Deflection plate part, 73...Support plate, 75, 75A...Deflection part, 78...Outlet side strainer, 79...Outlet side separation plate, 79a...Opening, 79b...Deflection plate part, 81...Bent piping part.

Claims

1. A container and a partition plate provided inside the container to divide the internal space of the container into a refrigerant introduction chamber and a refrigerant discharge chamber; an inlet pipe fixed to the container and having an inlet flow path connected to the refrigerant introducing chamber; at least one communication pipe passing through the partition plate, the communication pipe having an outlet opening disposed in the refrigerant discharge chamber and a communication flow path connecting the refrigerant introduction chamber and the refrigerant discharge chamber; at least one outlet pipe fixed to the container, the outlet pipe having an inlet opening disposed in the refrigerant discharge chamber and an outlet passage communicating with the refrigerant discharge chamber; a deflection section disposed in the refrigerant discharge chamber to block the line of sight between the outlet opening and the inlet opening, and to deflect the flow direction of the refrigerant flowing from the outlet opening into the refrigerant discharge chamber so that the refrigerant does not flow directly toward the inlet opening.

2. 2. The accumulator according to claim 1, wherein the deflection portion is a baffle plate provided in the refrigerant discharge chamber.

3. The accumulator according to claim 1 , wherein the deflection portion is a bent pipe portion provided at an end of the at least one connecting pipe that is disposed in the refrigerant discharge chamber.

4. A sealed container and a compression mechanism housed in the sealed container; an electric motor housed in the sealed container and generating a driving force for the compression mechanism; A compressor comprising: the accumulator according to claim 1 , which is disposed outside the sealed container and connected to a suction side of the compression mechanism.

5. The compressor according to claim 4; A heat sink; an expansion device; A heat sink; a refrigerant pipe that connects the compressor, the radiator, the expansion device, and the heat absorber and through which a refrigerant flows.

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