WO2023090149A1 - 圧縮機 - Google Patents
圧縮機 Download PDFInfo
- Publication number
- WO2023090149A1 WO2023090149A1 PCT/JP2022/040827 JP2022040827W WO2023090149A1 WO 2023090149 A1 WO2023090149 A1 WO 2023090149A1 JP 2022040827 W JP2022040827 W JP 2022040827W WO 2023090149 A1 WO2023090149 A1 WO 2023090149A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- oil
- oil return
- return pipe
- housing
- fixed
- 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
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/02—Lubrication
-
- 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
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
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- 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
- F04C23/005—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 of dissimilar working principle
-
- 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
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- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/028—Means for improving or restricting lubricant flow
-
- 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
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
- F04C18/356—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
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- 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
- F04C2240/806—Pipes for fluids; Fittings therefor
-
- 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
- F04C2240/809—Lubricant sump
-
- 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
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/12—Vibration
Definitions
- the present disclosure relates to a compressor, and more specifically to a compressor with an oil return pipe that returns oil to an oil sump within a housing.
- a housing is provided with an oil drain pipe for returning oil supplied to a sliding portion of a compression mechanism to an oil reservoir at the bottom of the housing.
- the central portion of the oil drain pipe has a larger outer diameter than the other portions.
- the oil drain pipe of Patent Document 1 is designed to reduce vibration by making the outer diameter of the center larger than that of other portions, the oil drain pipe has a special shape, which is not preferable in terms of cost.
- the present disclosure has been made in view of such circumstances, and aims to provide a compressor that can reduce vibration of an oil return pipe that returns oil to an oil reservoir in a housing with a simpler configuration. aim.
- a compressor includes a rotating shaft portion that is rotationally driven, a compression mechanism that is connected to one end of the rotating shaft portion and compresses a refrigerant, a bearing portion that supports the rotating shaft portion, and the a housing that accommodates the rotary shaft, the compression mechanism, and the bearing and has an oil reservoir below; an oil return pipe fixed to the bearing portion and having the other end extending toward the oil reservoir, wherein a plurality of the oil return pipes are provided in parallel so that their longitudinal axes are parallel. , each said oil return pipe is bundled.
- FIG. 1 is a vertical cross-sectional view showing a compressor according to an embodiment of the present disclosure
- FIG. FIG. 2 is a vertical cross-sectional view showing a main part of the compressor of FIG. 1
- 3 is a cross-sectional view taken along line III--III in FIG. 2
- FIG. FIG. 3 is a cross-sectional view taken along line IV-IV of FIG. 2
- 3 is an enlarged view of part A of FIG. 2
- FIG. FIG. 6 is a front view of the lower end of the oil return pipe shown in FIG. 5 as seen from inside the housing
- FIG. 6 is a cross-sectional view at the lower end of the oil return pipe shown in FIG.
- FIG. 4 is a cross-sectional view of the stabilizing plate viewed from below;
- FIG. 4 is a cross-sectional view of the stabilizing plate viewed from above;
- It is the longitudinal cross-sectional view which showed the modification and showed the principal part of the compressor.
- 11 It is an enlarged view in the B section of FIG. 13 is a front view of the lower end of the oil return pipe shown in FIG. 12 as seen from inside the housing;
- FIG. FIG. 13 is a cross-sectional view at the lower end of the oil return pipe shown in FIG. 12;
- a compressor 1 is used in an air conditioner, and performs two-stage compression of a refrigerant R, which is gas such as carbon dioxide.
- Compressor 1 is fixed to installation surface FL via legs 3 .
- the compressor 1 includes a housing 11, a rotary compression mechanism (low-stage compression mechanism) 12 provided inside the housing 11, a scroll compression mechanism (high-stage compression mechanism) 13, an electric motor 14, and a rotating shaft ( and a rotating shaft portion) 15 .
- the housing 11 includes a cylindrical body portion 21 and upper and lower lid portions 22 and 23 that close the upper and lower openings of the body portion 21 .
- the inside of the housing 11 forms a closed space.
- the rotating shaft 15 is provided to extend vertically along the axis X inside the housing 11 .
- An upper end (one end) of the rotating shaft 15 is rotatably supported by an upper bearing 31 .
- a lower end (other end) side of the rotating shaft 15 is rotatably supported by a lower bearing 32 .
- the electric motor 14 is arranged in the center in the longitudinal direction of the rotating shaft 15 and on the outer peripheral side of the rotating shaft 15, and rotates the rotating shaft 15 around the axis X.
- the electric motor 14 has a rotor 38 fixed to the outer peripheral surface of the rotary shaft 15 , and is radially opposed to the rotor 38 with a gap therebetween, and is shrink-fitted to the inner wall of the main body portion 21 of the housing 11 . and a stator 39 fixed by
- the rotor 38 is provided with rotor passages 38a provided at predetermined intervals in the circumferential direction. Each rotor passage 38a penetrates the rotor 38 in the vertical direction (axis X direction). The refrigerant discharged from the rotary compression mechanism 12 flows upward through these rotor passages 38a.
- An oil separation plate 38 b is fixed to the upper portion of the rotor 38 .
- the oil separation plate 38b is disc-shaped and arranged to extend in the horizontal direction. The oil separation plate 38b rotates around the axis X together with the rotor 38. As shown in FIG.
- a plurality of stator passages 39a are formed on the outer periphery of the stator 39 at predetermined angular intervals in the circumferential direction (specifically described later with reference to FIG. 3).
- an upper coil end 39b with a folded winding is positioned above the stator 39, and a lower coil end 39c with a folded winding is positioned below the stator 39.
- the electric motor 14 is connected to a power source via an inverter (not shown), and rotates the rotary shaft 15 with a variable frequency.
- the rotary compression mechanism 12 is provided inside the housing 11 on the lower end (other end) side of the rotating shaft 15 .
- the rotary compression mechanism 12 has two cylinders in this embodiment. It has a rotor 42 that is eccentric and rotates in the compression chamber C1, and a cylinder 44 in which the compression chamber C1 is formed.
- Refrigerant R is supplied from the suction pipe 33 to the compression chamber C1 formed in the cylinder 44 .
- the refrigerant compressed in the compression chamber C ⁇ b>1 is discharged from the rotary discharge pipe 43 through the lower bearing 32 to a region below the electric motor 14 within the housing 11 .
- the cylinder 44 is fixed from below with bolts 48 to the lower bearing 32 .
- An oil pump 49 fixed together with the cylinder 44 by bolts 48 is provided below the cylinder 44 .
- the oil pump 49 sucks the oil from the oil reservoir O1 at the bottom of the housing 11, passes through the oil supply hole 15a extending along the axis X of the rotating shaft 15, and guides it to the upper bearing 31 side.
- the scroll compression mechanism 13 is arranged above the electric motor 14 inside the housing 11 .
- the scroll compression mechanism 13 includes a fixed scroll 51 fixed to the upper bearing 31 and an orbiting scroll 57 arranged below the fixed scroll 51 so as to face the fixed scroll 51 .
- the fixed scroll 51 has an end plate 52 fixed to the upper surface of the upper bearing 31 and a fixed wrap 53 projecting downward from the end plate 52 .
- a discharge hole 52a penetrating vertically is formed in the central portion (near the axis X) of the end plate 52 .
- the orbiting scroll 57 is arranged so as to be sandwiched between the upper bearing 31 and the fixed scroll 51 .
- the orbiting scroll 57 has an end plate 58 connected to the upper end side of the rotating shaft 15 and an orbiting wrap 59 projecting upward from the end plate 58 .
- the end plate 58 is fixed via a bush 55 to an eccentric shaft portion 56 provided at the upper end of the rotating shaft 15 and rotates eccentrically with respect to the axis X as the rotating shaft 15 rotates.
- the orbiting wrap 59 meshes with the fixed wrap 53 to form a compression chamber C2 for compressing the refrigerant R between itself and the fixed wrap 53 .
- a balance weight chamber 63 is formed between the recess on the central side of the upper bearing 31 and the bottom of the orbiting scroll 57 . Inside the balance weight chamber 63 , the balance weight 54 rotates together with the rotating shaft 15 .
- the refrigerant R compressed by the rotary compression mechanism 12 and discharged into the housing 11 is sucked into the compression chamber C2 from the outer peripheral side of the scroll compression mechanism 13 and compressed toward the center.
- the compressed refrigerant R is discharged from the discharge pipe 34 to the outside of the housing 11 through the discharge hole 52 a of the fixed scroll 51 .
- a cover 45 is provided below the upper bearing 31 so as to cover the upper bearing 31 .
- the cover 45 is formed by sheet metal processing, and has a substantially conical shape that expands in diameter from bottom to top.
- a suction opening 45 a is provided at the lower end of the cover 45 . That is, the intake opening 45 a is an annular region that faces downward and is formed between the cover 45 and the rotating shaft 15 .
- a space below the housing 11 and a space on the side of the upper bearing 31 are partitioned by the cover 45 so that only the refrigerant sucked from the suction opening 45 a is guided to the scroll compression mechanism 13 .
- An oil level tank 60 is provided outside and below the housing 11 .
- the oil level tank 60 is a hollow container and communicates with the inside of the housing 11 via a lower pipe 61 and an upper pressure equalizing pipe 62 .
- the oil level tank 60 measures the oil level of the oil reservoir O1 by introducing oil from the oil reservoir O1 in the housing 11 through the lower pipe 61 .
- a downstream end of an oil separator oil return pipe 65 is connected to the lower side portion of the housing 11 .
- An upstream end of the oil separator oil return pipe 65 is connected to an oil separator (not shown).
- the oil separated from the refrigerant discharged from the compressor 1 by the oil separator is returned to the oil reservoir O ⁇ b>1 inside the housing 11 via the oil separator oil return pipe 65 .
- the height position where the downstream end of the oil separator oil return pipe 65 is connected to the housing 11 is below the lower bearing 32 .
- An oil return pipe 67 is provided in the housing 11 and extends vertically while contacting the inner wall of the housing 11 . As shown in FIG. 2 , the oil return pipe 67 is provided such that its upper end (one end) is fixed to the upper bearing 31 and its lower end (the other end) is located in the oil reservoir O1 at the bottom of the housing 11 .
- the oil return pipe 67 is provided so as to pass through the space formed between the stator 39 and the housing 11 .
- notches are provided in the outer circumference of the stator 39 at predetermined angular intervals in the circumferential direction, thereby forming a plurality of stator passages 39a in the circumferential direction between the stator 39 and the inner wall of the housing 11. ing. Refrigerant and oil flow through these stator passages 39a.
- the oil return pipe 67 is inserted through one or more of these stator passages 39a. In the example shown in FIG. 3, one of the stator passages 39a is used to pass the oil return pipe 67 therethrough.
- the rotor passages 38a are provided at predetermined intervals in the circumferential direction.
- the refrigerant discharged from the rotary compression mechanism 12 flows upward through these rotor passages 38a.
- each oil return pipe 67 is made of, for example, a copper pipe, and has the same outer diameter and inner diameter along its length.
- the number of parallel oil return pipes 67 is determined by the amount of oil returned, and may be three or more.
- the upper end of the oil return pipe 67 is attached so as to communicate with the oil return hole 31 a formed in the upper bearing 31 .
- the oil return hole 31 a extends horizontally, and the inner peripheral end thereof is formed so as to open to the balance weight chamber 63 that accommodates the balance weight 54 .
- FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 2, showing the fixing portion between the oil return pipe 67 and the upper bearing 31.
- Upper ends of the two oil return pipes 67 are fixed to a common boss 68 .
- the boss 68 is made of metal, into which the upper end of each oil return pipe 67 is inserted and fixed by brazing or the like.
- the upper end of each oil return pipe 67 communicates with a communicating hole 68 a formed in the boss 68 .
- the communication hole 68a opens toward the upper surface of the boss 68.
- Boss 68 is fixed to the lower surface of upper bearing 31 by a plurality of bolts 69 .
- a communication hole 68 a formed in the boss 68 opens into a vertical hole 31 b connected to the oil return hole 31 a of the upper bearing 31 , thereby communicating the oil return pipe 67 and the balance weight chamber 63 .
- FIG. 5 is an enlarged view of the A portion of FIG. 2, showing the lower end of the oil return pipe 67.
- FIG. A lower end of the oil return pipe 67 is fixed to the inner wall of the housing 11 via a rod-like member 70 .
- the bar member 70 is made of steel and is a solid round bar.
- the length of the rod-shaped member 70 overlaps over a predetermined dimension (for example, several mm to several tens of mm) at the tip of the oil return pipe 67, and extends downward from the tip of the oil return pipe 67 for a predetermined dimension (for example, several mm to several tens of mm). ).
- the rod-shaped members 70 are fixed to respective side surfaces of the lower ends of the adjacent rod-shaped members 70 on both sides. Fixation of the rod-like member 70 and the oil return pipe 67 is performed by, for example, brazing.
- the outer diameter of the rod-shaped member 70 is arbitrary as long as it can be inserted between the oil return pipes 67 and fixed to the respective oil return pipes 67 , and preferably smaller than the outer diameter of the oil return pipes 67 .
- the cross-sectional shape of the rod-shaped member 70 may be circular as shown in FIG. 7, or may be polygonal.
- the rod-shaped member 70 is fixed to the inner wall of the housing 11. Specifically, the lower end (tip) of the rod-shaped member 70 is fixed by welding. For example, before the lower lid portion 23 (see FIG. 1) of the housing 11 is attached, the lower end of the bar member 70 is welded by accessing from below the main body portion 21 .
- substantially the entire oil return pipe 67 for example, 1/2 or more of the longitudinal dimension from the lower end of the oil return pipe 67
- the oil return pipe 67 is bent from the fixed position of the upper end of the oil return pipe 67 to the height position of the upper coil end 39b of the electric motor 14, and the upper coil end 39b is bent. , the oil return pipe 67 is brought close to the inner wall of the housing 11 all the way down. As a result, movement of the oil return pipe 67 is restricted, and vibration of the oil return pipe 67 can be suppressed.
- a slight gap for example, 0.1 mm to several mm
- the lower end of the rod-shaped member 70 has a tapered shape cut along one plane that is inclined with respect to the longitudinal axis of the oil return pipe 67 .
- a tapered distal end 67 a of the oil return pipe 67 is positioned on the inner wall side of the housing 11 .
- a stabilizing plate (oil surface upper plate) 75 is fixed to the lower surface of the lower bearing 32 .
- the stabilizing plate 75 is fixed to the lower bearing 32 (specifically, the radially protruding leg of the lower bearing 32) with bolts 76.
- the stabilizing plate 75 is a disk with an opening formed in the center.
- the stabilizing plate 75 can cover the oil surface of the oil reservoir O1 (see FIGS. 1 and 2).
- the height position of the stabilizing plate 75 may be lower than the refrigerant discharge position of the rotary compression mechanism 12 .
- the fixing position of the stabilizing plate 75 is not limited to the lower bearing 32, and it may be fixed to another fixing position (for example, the housing 11).
- the stabilizing plate 75 stabilizes the oil surface of the oil sump O1 and can prevent oil from leaving the oil sump O1 along with the flow of refrigerant discharged from the rotary compression mechanism 12 as much as possible.
- the two oil return pipes 67 are provided at three locations in the circumferential direction, but this is an example, and there may be one location as in FIG. 10 and FIG.
- the lower end of the oil return pipe 67 is located below the stabilizing plate 75 .
- the lower end of the oil return pipe 67 is provided below the position where the downstream end of the oil separator oil return pipe 65 opens into the housing 11 .
- the oil returned from the oil separator oil return pipe 65 flows as indicated by the black arrow (see FIG. 8), and flows into the oil reservoir O1. Even if the oil surface splashes and disturbs the oil surface, it is possible to suppress the oil from being swirled up along with the flow of refrigerant discharged from the rotary compression mechanism 12 .
- the compressor 1 configured as described above operates as follows. Refrigerant evaporated by an evaporator (not shown) is sucked into the compressor 1 through a suction pipe 33 and compressed by the rotary compression mechanism 12 . The refrigerant compressed by the rotary compression mechanism 12 is discharged from the rotary discharge pipe 43 into the housing 11 . Refrigerant discharged into the housing 11 is sucked from the suction opening 45a of the cover 45, passes through the flow path in the cover 45, is guided to the scroll compression mechanism 13, and is compressed. The refrigerant compressed by the scroll compression mechanism 13 passes through the discharge hole 52a of the fixed scroll 51 and is discharged from the discharge pipe 34 to an external gas cooler or condenser.
- Oil is separated from the refrigerant discharged from the discharge pipe 34 by an oil separator (not shown).
- the separated oil passes through the oil separator oil return pipe 65, is returned into the housing 11, and is stored in the oil reservoir O1.
- the oil stored in the oil reservoir O1 is sucked up by the oil pump 49 and guided to the scroll compression mechanism 13 side through the oil supply hole 15a formed in the rotary shaft 15.
- the oil guided to the scroll compression mechanism 13 side lubricates sliding portions such as the bearing portion of the upper bearing 31 and the bush 55, and then is returned to the oil reservoir O1 below.
- the oil guided to the balance weight chamber 63 is guided to the oil return pipe 67 through the oil return hole 31 a and the vertical hole 31 b (see FIG. 2) formed in the upper bearing 31 .
- the oil guided to the oil return pipe 67 passes through the internal flow path, is discharged from the lower end, and is returned to the oil reservoir O1.
- the oil that has lubricated the upper bearing 31 is returned to the oil reservoir O1 below the housing 11 by the oil return pipe 67 . Since the upper end of the oil return pipe 67 is a fixed end fixed to the upper bearing 31, vibration of the compressor 1 may be transmitted and repeated stress may occur.
- a plurality of oil return pipes 67 which are arranged in parallel so that their longitudinal axes are parallel, are bundled via a rod-like member 70 to increase the overall rigidity of the oil return pipes 67. It was decided to. As a result, vibration of the oil return pipe 67 can be suppressed.
- the strength of the upper end of the oil return pipe 67 fixed to the upper bearing 31 can be increased. Fatigue fracture can be suppressed.
- the lower end of the oil return pipe 67 is fixed to the inner wall of the housing 11 using a rod-shaped member 70. As a result, the two points of the upper end and the lower end of the oil return pipe 67 are fixed, so that the vibration of the oil return pipe 67 can be further suppressed.
- Both oil return pipes 67 are bundled by fixing a rod-shaped member 70 to each side surface of the lower end of the adjacent oil return pipes 67 . Then, the rod-shaped member 70 is fixed to the inner wall of the housing 11 . Accordingly, the adjacent oil return pipes 67 can be bundled and easily fixed to the inner wall of the housing 11 .
- the rod-like member 70 is used when bundling and fixing the lower ends of the oil return pipes 67, but it can be modified as follows.
- a fixture 78 is used to bundle and fix the lower ends of the oil return pipes 67 .
- the fixing bracket 78 can be formed by bending a flat plate. Specifically, as shown in FIG. 14, it is bent so as to form a space with the inner wall of the housing 11 . Then, the leg portions 78a on both sides of the fixing metal fitting 78 are fixed to the housing 11 by welding or the like.
- the lower end of the oil return pipe 67 is inserted into the space formed by the fixture 78 . Displacement of each oil return pipe 67 is constrained within the space formed by the fixture 78 . Thereby, the lower ends of the oil return pipes 67 can be easily bundled and positioned.
- a compressor includes a rotating shaft portion (15) that is driven to rotate, a compression mechanism (13) that is connected to one end of the rotating shaft portion and compresses a refrigerant, and supports the rotating shaft portion.
- a housing (11) that accommodates the rotating shaft, the compression mechanism, and the bearing and has an oil reservoir (O1) below; an oil return pipe (67) having one end fixed to the bearing portion and the other end extending toward the oil sump so as to return the held oil to the oil sump, wherein the oil return pipe is , are provided in parallel so that their longitudinal axes are parallel, and the respective oil return pipes are bundled.
- the oil that has lubricated the bearings is temporarily held in the bearings and returned to the oil reservoir at the bottom of the housing by an oil return pipe. Since one end of the oil return pipe is a fixed end fixed to the bearing, the vibration of the compressor is transmitted and repeated stress is generated.
- the overall rigidity of the oil return pipes can be increased. Thereby, the vibration of the oil return pipe can be suppressed.
- a scroll compression mechanism is used as the compression mechanism.
- the other end of the oil return pipe is fixed to the inner wall of the housing.
- a compressor according to an aspect of the present disclosure includes a rod-shaped member (70) provided between the other ends of the adjacent oil return pipes and fixed to each side surface of the adjacent other ends, wherein the rod-shaped A member is fixed to the inner wall of the housing.
- Both oil return pipes are bundled by fixing a rod-shaped member to each side surface of the other end of the adjacent oil return pipes. Then, the rod-like member is fixed to the inner wall of the housing. Accordingly, the adjacent oil return pipes can be bundled and easily fixed to the inner wall of the housing. Brazing or welding, for example, can be used to fix the rod-like member to the oil return pipe and/or fix the rod-like member to the inner wall of the housing.
- the compressor according to one aspect of the present disclosure includes a fixing bracket (78) that is fixed to the inner wall of the housing and forms a space between the inner wall and the other ends of the plurality of oil return pipes. are bundled while being inserted into the space.
- a fixing bracket is fixed to the inner wall of the housing, and a space is formed between the inner wall and the fixing bracket. By inserting the other ends of the plurality of oil return pipes into this space, these oil return pipes are bundled. Thereby, the other ends of the oil return pipes can be easily bundled.
- the oil return pipe is installed in close proximity to the inner wall of the housing over a length of 1/2 or more in the longitudinal direction from the other end.
- adjacent means that the oil return pipe and the inner wall of the housing may be in contact with each other, or that there may be a gap of about 0.1 mm to several mm, for example.
- the oil return pipe has the same diameter along its longitudinal direction.
- the cost can be reduced because the oil return pipe can be manufactured using pipes of the same diameter.
- the other end of the oil return pipe has a tapered shape cut in one plane inclined with respect to the longitudinal axis of the oil return pipe, and the tip of the tapered shape (67a) is located on the inner wall side of the housing.
- the other end of the oil return pipe has a tapered shape cut along one plane that is inclined with respect to the longitudinal axis, and its tip is located on the inner wall side of the housing.
- another compression mechanism (12) that is connected to the other end of the rotating shaft portion and compresses the refrigerant, and below the refrigerant discharge position of the other compression mechanism,
- An oil surface upper plate is provided below the refrigerant discharge position of another compression mechanism connected to the other end of the rotary shaft to cover the oil surface. Furthermore, the oil surface upper plate is provided above the oil surface formed in the oil reservoir. As a result, it is possible to prevent, as much as possible, the oil from leaving the oil reservoir along with the flow of refrigerant discharged from the other compression mechanism.
- a rotary compression mechanism is used as another compression mechanism.
- the other end of the oil return pipe opens below the oil surface upper plate.
- the oil surface upper plate prevents the discharged refrigerant flow from other compression mechanisms. It is possible to suppress the flow along with it.
- a compressor according to an aspect of the present disclosure includes an oil separator oil return pipe (65) that returns oil from an oil separator in which oil separated from refrigerant discharged from the compressor is stored, and the oil separator oil return pipe It is open below the surface upper plate.
- the oil surface upper plate isolates it from the discharge refrigerant flow of other compression mechanisms. can do.
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Abstract
Description
特許文献1には、圧縮機構部の摺動部に供給された油をハウジング下部の油溜まりに戻す排油パイプをハウジング内に設けている。そして、排油パイプの振動を低減するために、排油パイプの中央部の外径を他の部分よりも大きくしている。
図1に示すように、圧縮機1は、空調機に用いられ、例えば二酸化炭素等のガスである冷媒Rを二段圧縮する。圧縮機1は、脚部3を介して設置面FLに対して固定されている。圧縮機1はハウジング11と、ハウジング11の内部に設けられたロータリ圧縮機構(低段側圧縮機構)12と、スクロール圧縮機構(高段側圧縮機構)13と、電動モータ14と、回転軸(回転軸部)15とを備えている。
図1に示すように、ステータ39の上部には巻線が折り返された上側コイルエンド39bが位置し、ステータ39の下部には巻線が折り返された下側コイルエンド39cが位置している。電動モータ14は、不図示のインバータを介して電源に接続されており、回転軸15を周波数可変として回転させる。
なお、図9では、2本1組の油戻し管67が周方向に3ヶ所設けられているが、これは例示であり、図10や図3のように1ヶ所であっても良い。
図示しない蒸発器で蒸発した冷媒が吸入管33から圧縮機1内に吸い込まれ、ロータリ圧縮機構12で圧縮される。ロータリ圧縮機構12で圧縮された冷媒は、ロータリ吐出管43からハウジング11の内部に吐出される。
ハウジング11内に吐出された冷媒は、カバー45の吸入開口45aから吸い込まれ、カバー45内の流路を通りスクロール圧縮機構13へと導かれて圧縮される。スクロール圧縮機構13で圧縮された冷媒は、固定スクロール51の吐出孔52aを通り吐出管34から外部のガスクーラ又は凝縮器へと吐出される。
上部軸受31を潤滑した油は、油戻し管67によってハウジング11下部の油溜まりO1へと戻される。油戻し管67の上端は、上部軸受31に固定された固定端とされているので、圧縮機1の振動が伝達されて繰り返し応力が生じるおそれがある。本実施形態では、それぞれの長手軸線が平行となるように複数本が並列に設けられた各油戻し管67を、棒状部材70を介して束ねることによって、油戻し管67の全体の剛性を大きくすることとした。これにより、油戻し管67の振動を抑制することができる。また、油戻し管67を複数本として断面二次モーメントを大きくすることで、上部軸受31に固定された油戻し管67の上端の強度を増加することができるので、油戻し管67の上端における疲労破壊を抑制できる。
図11~図14に示すように、固定金具78を用いて油戻し管67の下端を束ねて固定する。固定金具78は、平板のプレートを折り曲げて成形することができる。具体的には、図14に示すように、ハウジング11の内壁との間で空間が形成されるように折り曲げる。そして、固定金具78の両側の脚部78aをハウジング11に対して溶接等によって固定する。固定金具78によって形成された空間内に油戻し管67の下端を挿入する。各油戻し管67は、固定金具78によって形成された空間内で変位が拘束される。これにより、簡便に油戻し管67の下端を束ねて位置決めすることができる。
それぞれの長手軸線が平行となるように複数本が並列に設けられた各油戻し管を束ねることによって、油戻し管の全体の剛性を大きくすることができる。これにより、油戻し管の振動を抑制することができる。また、油戻し管を複数本として断面二次モーメントを大きくすることで、軸受部に固定された油戻し管の一端の強度を増加することができるので、油戻し管の一端における疲労破壊を抑制できる。
圧縮機構としては、例えばスクロール圧縮機構が用いられる。
棒状部材と油戻し管との固定、及び/又は、棒状部材とハウジングの内壁との固定は、例えば、ろう付けや溶接を用いることができる。
なお、近接とは、油戻し管とハウジングの内壁とは接触していても良いし、例えば0.1mm~数mm程度の隙間が空いていても良いことを意味する。
他の圧縮機構としては、例えばロータリ圧縮機構が用いられる。
3 脚部
11 ハウジング
12 ロータリ圧縮機構(低段側圧縮機構)
13 スクロール圧縮機構(高段側圧縮機構)
14 電動モータ
15 回転軸(回転軸部)
15a 油供給穴
21 本体部
22 上部蓋部
23 下部蓋部
31 上部軸受(軸受部)
31a 油戻し穴
31b 縦穴
32 下部軸受
33 吸入管
34 吐出管
38 ロータ
38a ロータ通路
38b 油分離プレート
39 ステータ
39a ステータ通路
39b 上側コイルエンド
39c 下側コイルエンド
41 偏心軸部
42 ロータ
43 ロータリ吐出管
44 シリンダ
45 カバー
45a 吸入開口
48 ボルト
49 油ポンプ
51 固定スクロール
52 端板
52a 吐出孔
53 固定ラップ
54 バランスウェイト
55 ブッシュ
56 偏心軸部
57 旋回スクロール
58 端板
59 旋回ラップ
60 オイルレベルタンク
61 下部配管
62 均圧管
63 バランスウェイト室
65 オイルセパレータ返油管
67 油戻し管
67a 先端
68 ボス
68a 連通穴
69 ボルト
70 棒状部材
75 スタビライジングプレート(油面上方プレート)
76 ボルト
78 固定金具
78a 脚部
C1 圧縮室
C2 圧縮室
FL 設置面
O1 油溜まり
X 軸線
Claims (10)
- 回転駆動される回転軸部と、
前記回転軸部の一端に接続され、冷媒を圧縮する圧縮機構と、
前記回転軸部を支持する軸受部と、
前記回転軸部、前記圧縮機構及び前記軸受部を収容するとともに下方に油溜まりを有するハウジングと、
前記ハウジング内に設けられ、前記軸受部に保持された油を前記油溜まりに戻すように、一端が前記軸受部に固定され、他端が前記油溜まりに向かって延在する油戻し管と、
を備え、
前記油戻し管は、それぞれの長手軸線が平行となるように複数本が並列に設けられ、各前記油戻し管が束ねられている圧縮機。 - 前記油戻し管の前記他端が、前記ハウジングの内壁に固定されている請求項1に記載の圧縮機。
- 隣り合う前記油戻し管の前記他端の間に設けられ、隣り合う該他端のそれぞれの側面に固定された棒状部材を備え、
前記棒状部材は、前記ハウジングの前記内壁に対して固定されている請求項2に記載の圧縮機。 - 前記ハウジングの前記内壁に対して固定され、該内壁との間で空間を形成する固定金具を備え、
複数の前記油戻し管の前記他端は、前記空間に挿入された状態で束ねられている請求項2に記載の圧縮機。 - 前記油戻し管は、前記他端から長手方向の1/2以上の長さにわたって、前記ハウジングの前記内壁に近接した状態で設置されている請求項1から4のいずれかに記載の圧縮機。
- 前記油戻し管は、その長手方向にわたって同一径とされている請求項1から5のいずれかに記載の圧縮機。
- 前記油戻し管の前記他端は、該油戻し管の長手軸線に対して傾斜した1つの面で切断された先細形状とされ、
該先細形状の先端が前記ハウジングの前記内壁側に位置している請求項1から6のいずれかに記載の圧縮機。 - 前記回転軸部の他端に接続され、冷媒を圧縮する他の圧縮機構と、
前記他の圧縮機構の冷媒吐出位置よりも下方でかつ、前記油溜まりに形成される油面よりも上方に設けられて、該油面を覆う油面上方プレートと、
を備えている請求項1から7のいずれかに記載の圧縮機。 - 前記油戻し管の前記他端は、前記油面上方プレートよりも下方に開口している請求項8に記載の圧縮機。
- 圧縮機から吐出した冷媒から分離した油が貯留されるオイルセパレータから油を戻すオイルセパレータ返油管を備え、
前記オイルセパレータ返油管は、前記油面上方プレートよりも下方に開口している請求項8又は9に記載の圧縮機。
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018100595A (ja) | 2016-12-19 | 2018-06-28 | 日立ジョンソンコントロールズ空調株式会社 | 圧縮機 |
| JP2019039414A (ja) * | 2017-08-29 | 2019-03-14 | 三菱重工サーマルシステムズ株式会社 | スクロール圧縮機及びその制御方法並びに空気調和装置 |
| WO2020157792A1 (ja) * | 2019-01-28 | 2020-08-06 | 三菱電機株式会社 | スクロール圧縮機 |
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| JP4192158B2 (ja) * | 2005-03-24 | 2008-12-03 | 日立アプライアンス株式会社 | 密閉形スクロール圧縮機及び冷凍空調装置 |
| JP2009097486A (ja) * | 2007-10-19 | 2009-05-07 | Mitsubishi Heavy Ind Ltd | 圧縮機 |
| JP5701112B2 (ja) * | 2011-03-15 | 2015-04-15 | 三菱重工業株式会社 | 密閉型圧縮機 |
| US9470230B2 (en) * | 2011-04-25 | 2016-10-18 | Johnson Controls-Hitachi Air Conditioning Technology (Hong Kong) Limited | Refrigerant compressor and refrigeration cycle apparatus using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018100595A (ja) | 2016-12-19 | 2018-06-28 | 日立ジョンソンコントロールズ空調株式会社 | 圧縮機 |
| JP2019039414A (ja) * | 2017-08-29 | 2019-03-14 | 三菱重工サーマルシステムズ株式会社 | スクロール圧縮機及びその制御方法並びに空気調和装置 |
| WO2020157792A1 (ja) * | 2019-01-28 | 2020-08-06 | 三菱電機株式会社 | スクロール圧縮機 |
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| JP7830084B2 (ja) | 2026-03-16 |
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| EP4400724A1 (en) | 2024-07-17 |
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