US20100074773A1 - Electric compressor - Google Patents
Electric compressor Download PDFInfo
- Publication number
- US20100074773A1 US20100074773A1 US12/442,493 US44249308A US2010074773A1 US 20100074773 A1 US20100074773 A1 US 20100074773A1 US 44249308 A US44249308 A US 44249308A US 2010074773 A1 US2010074773 A1 US 2010074773A1
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- United States
- Prior art keywords
- lubricating oil
- housing
- oil reservoir
- compression mechanism
- electric compressor
- 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.)
- Abandoned
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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
- 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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/10—Outer members for co-operation with rotary pistons; Casings
-
- 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
- F04C18/344—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 inner member
- F04C18/3441—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 inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
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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
-
- 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
- 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
- F04C2240/803—Electric connectors or cables; 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
- F04C2240/808—Electronic circuits (e.g. inverters) installed inside the machine
Definitions
- the present invention relates to an electric compressor integrally including a compression mechanism and an electric motor.
- a compression mechanism and an electric motor driving the same are accommodated in a housing, at the bottom of which a reservoir of lubricating oil for lubrication of required lubrication portions of the compression mechanism is provided.
- Patent Literature 1 discloses a transverse-mounted electric compressor.
- part of the housing accommodating the electric motor is extended axially outward, and the lubricating oil reservoir is provided for the extended part.
- the lubricating oil within the reservoir is supplied to the required lubrication portions of the compression mechanism, and the lubricating oil is returned to the lubricating oil reservoir.
- the lubricating oil reservoir is provided for the axially extended part of the housing.
- the housing is inevitably elongated in the axial direction, thus resulting in an increase in size of the electric compressor.
- the lubricating oil reservoir is provided at the portion of the housing just extended. Accordingly, it is necessary to employ a reinforcing structure, such as increasing wall thickness of the housing or providing a reinforcement rib, in order to reinforce the lubricating oil reservoir, thus causing an increase in weight.
- An object of the present invention is to provide an electric compressor in which the lubricating oil reservoir can be reinforced using an existing constituent member while the housing is prevented from being elongated in the axial direction.
- Patent Literature 1 Japanese Patent Laid-open Publication No. 6-2684
- an electric compressor includes: a housing accommodating at least a compression mechanism and an electric motor driving the compression mechanism; and a mounting bracket protruded at least at lower outside of the housing, in which a lubricating oil reservoir provided at the bottom of the housing is placed under the compression mechanism or electric motor in the vicinity of the mounting bracket.
- the electric compressor further includes: a discharge port opened in the housing, through which fluid compressed by the compression mechanism is discharged to the outside of the housing; a pressure introduction path allowing the discharge port and lubricating oil reservoir to communicate with each other; and a lubricating oil feeding path allowing the lubricating oil reservoir and a sliding portion of the compression mechanism to communicate with each other.
- FIG. 1 is a perspective view of a whole electric compressor according to a first embodiment of the present invention.
- FIG. 2 is a longitudinal section view of the electric compressor according to the first embodiment of the present invention.
- FIG. 3 is a longitudinal section view of an electric compressor according to a second embodiment of the present invention.
- FIG. 4 is a cross section view taken along a line IV-IV of FIG. 3 .
- FIG. 5 is a rear view of the electric compressor according to the second embodiment of the present invention.
- the embodiments are examples of an electric compressor applied to a refrigeration cycle of an air conditioner of a vehicle.
- fluid compressed by the electric compressor is a refrigerant of the refrigeration cycle.
- FIG. 1 is a perspective view of a whole electric compressor according to a first embodiment of the present invention
- FIG. 2 is a longitudinal section view of the electric compressor.
- a rear case 12 , a middle case 13 , and a front case 14 which are separated in the axial direction (in the horizontal direction of FIG. 2 ), are joined to each other to constitute a housing 11 .
- the middle case 13 accommodates a compression mechanism 20 ;
- the rear case 12 accommodates an electric motor 30 ;
- the front case 14 accommodates a motor drive circuit 40 controlling energization of the electric motor 30 .
- refrigerant introduced into the housing 11 through an introduction port 15 formed in the middle case 13 is compressed by the compression mechanism 20 and is then discharged through a discharge port 16 formed in the rear case 12 .
- the compression mechanism 20 is configured as a rotary type with vanes.
- the compression mechanism 20 schematically includes a cylinder block 22 , a compressor rotor 23 , a plurality of vanes 24 , and inlet and outlet side blocks 25 and 26 .
- the cylinder block 22 includes a cylinder chamber 21 formed in a non-circular shape with a smooth inner circumference as shown in FIG. 2 .
- the compressor rotor 23 is rotatably accommodated in the cylinder chamber 21 .
- the vanes 24 are provided on the outer circumference of the compressor rotor 23 so as to be freely retracted and extended and are arranged circumferentially at predetermined intervals. The tips of the vanes 24 slide on the inner circumferential surface of the cylinder chamber 21 .
- the inlet and outlet side blocks 25 and 26 are arranged on the both sides of the cylinder block 22 in the axial direction and close both axial ends of the cylinder chamber 21 .
- the compressor rotor 23 slides on the inlet and outlet side blocks 25
- an inlet port (not shown) is formed so that the refrigerant introduced from the introduction port 15 is introduced into the cylinder chamber 21 through the inlet port.
- an outlet port (not shown) is formed, through which the compressed refrigerant in the cylinder chamber 21 is discharged.
- the compressor rotor 23 is rotated with a drive shaft 31 of the electric motor 30 to change the circumferential volume of the cylinder chamber 21 while retracting and advancing the vanes 24 .
- the refrigerant at low pressure which is sucked into the cylinder 21 through the inlet port is compressed, and the compressed refrigerant at high pressure is discharged through the outlet port.
- the refrigerant at high pressure discharged from the outlet port passes through a channel between the inner circumference of the middle case 13 and the compression mechanism 20 and then passes through the rear case 12 accommodating the electric motor 30 to be discharged from the discharge port 16 . At this time, the refrigerant passing through the rear case 12 cools part of the electric motor 30 generating heat.
- the electric motor 30 includes a cylindrical stator 32 pressed into and fixed to the inner circumference of the rear case 12 and a rotor 33 rotatably accommodated in the stator 32 .
- a plurality of coil portions provided on the stator 32 circumferentially at constant intervals are energized to excite the stator 32 , thus rotating the rotor 33 .
- the drive shaft 31 is inserted and engaged so as not to move relative to the rotor 33 in a rotating direction.
- An end (the left end in the drawing) of the drive shaft 31 is coupled with an end (the right end in the drawing) of the compressor rotor 23 of the compression mechanism 20 with a non-circular fitting portion 31 S. The rotation of the drive shaft 31 is thus transmitted to the compressor rotor 23 .
- a partition wall 14 W is provided in the middle case 13 side of the front case 14 .
- the other end of the front case 14 is opened.
- the open end is closed by an end plate 14 E after the motor drive circuit 40 is accommodated in the front case 14 from the open side.
- the motor drive circuit 40 is provided with a substrate 41 .
- an inverter including electronic parts such as a switching device switching on and off of a circuit (for example, a MOS-FET, an IGBT, or the like) is mounted.
- the motor drive circuit 40 and the coil portions provided for the stator 32 of the electric motor 30 are electrically connected through a harness 44 .
- a hermetic terminal 45 is provided in the middle of the harness 44 .
- the connection terminal 45 is located within an upper space portion 11 U formed by projecting upper part of the middle and front cases 13 and 14 .
- mounting brackets 17 are partially protruded, with which the electric compressor 10 is mounted in an engine room, for example, on a cylinder block of the engine or the like.
- the mounting brackets 17 are protruded at total three places on the upper and lower outside of the middle case 13 (see FIGS. 1 and 2 ) and an end of the rear case 12 (see FIG. 2 ). Each of the mounting brackets 17 is integrally protruded on the outer circumference of the middle or rear case 13 or 12 in a rib shape. In each mounting bracket 17 , a mounting hole 17 a is formed, through which a mounting bolt (not shown) is inserted so as to penetrate perpendicular to the axial direction of the housing 11 .
- a lubricating oil reservoir 50 provided at the bottom of the housing 11 is placed under the compression mechanism 20 in the vicinity of the mounting bracket 17 (the mounting bracket 17 provided at the lower outside of the middle case 13 ).
- a lower space portion 11 L for accommodating an electronic part 43 of the motor drive circuit 40 is projected so as to have a width W 2 slightly smaller than a horizontal width W 1 of the attachment bracket 17 .
- the lubricating oil reservoir 50 is formed between the lower space portion 11 L and the mounting bracket 17 so that bottom part of the middle case 13 is projected to have a width W 1 equal to the mounting bracket 17 .
- an opening 51 is formed which is air-tightly closed detachably with a plug 52 .
- a rotation shaft 27 of the compressor rotor 23 is rotatably supported through sliding bearings 28 F and 28 R which are respectively formed in the side blocks 25 and 26 on both sides thereof in the axial direction.
- An oil path 29 (a lubricating oil feeding path) allowing the sliding bearing 28 R (in the right side in the drawing) and the bottom of the lubricating oil reservoir 50 to communicate with each other is formed. The lubricating oil within the lubricating oil reservoir 50 is sucked into the sliding bearing 28 R along with rotation of the compressor rotor 23 .
- the lubricating oil reservoir 50 provided at the bottom of the housing 11 is placed under the compression mechanism 20 . Accordingly, the lubricating oil reservoir 50 can be provided by effectively using dead space within the housing 11 formed under the compression mechanism 20 . The lubricating oil reservoir 50 can be thus provided without extending the housing 11 in the axial direction. It is therefore possible to prevent the housing 11 from being elongated in the axial direction and prevent the electric compressor 10 from increasing in size.
- the lubricating oil reservoir 50 is placed in the vicinity of the mounting bracket 17 protruded on the lower outside of the housing 11 . Accordingly, the rigidity of the existing mounting bracket 17 can secure the strength of the lubricating oil reservoir 50 . It is therefore possible to prevent the electric compressor 10 from increasing in weight.
- FIG. 3 is a longitudinal section view of an electric compressor according to the second embodiment of the present invention
- FIG. 4 is a cross-section view along a line IV-IV of FIG. 3
- FIG. 5 is a rear view of the electric compressor according to this embodiment.
- An electric compressor 10 A according to this embodiment includes the same constituent elements as those of the electric compressor 10 according to the first embodiment. Hereinafter, the same constituent elements are given the same reference numerals, and the redundant description is omitted.
- the electric compressor 10 A according to this embodiment differs from the first embodiment (see FIG. 2 ) in that two mounting brackets 17 and 17 are provided on the lower outside of the housing 11 so as to be separated from each other in the axial direction.
- one of the mounting brackets 17 and 17 is protruded on the lower outside of the rear case 12
- the other mounting bracket 17 is protruded on the lower outside of the middle case 13 .
- a lubricating oil reservoir 50 A is provided across the rear and middle cases 12 and 13 between the two mounting brackets 17 and 17 .
- the lubricating oil reservoir 50 A is provided under the electric motor 30 .
- the lubricating oil reservoir 50 A communicates through a pressure introduction path 61 with a discharge port 16 A opened in the upper part of the rear end of the rear case 12 .
- This pressure introduction path 61 penetrates through inside of the outer wall of the rear case 12 .
- the pressure introduction path 61 includes a vertical path 61 a extending downward from the discharge port 16 A opened in the upper part of the rear end of the rear case 12 and a horizontal path 61 b extending from the bottom end of the vertical path 61 a in the axial direction and communicating with the lubricating oil reservoir 50 A.
- a lubricating oil introduction path 63 extended downward and opened to the outside of the housing 11 is branched from the middle of the pressure introduction path 61 .
- the opening of the lubricating oil introduction path 63 is plugged with a cap 64 .
- An oil path 62 (lubricating oil feeding path) which allows the front end (the left end in FIG. 3 ) of the lubricating oil reservoir 50 A and a sliding portion (a bearing hole) of the compression mechanism 20 to communicate with each other penetrates through inside of the middle case 13 and side block 26 in this embodiment.
- the lubricating oil reservoir 50 A is provided between the mounting brackets 17 and 17 protruded on the lower outside of the housing 11 , thus achieving an efficient use of dead space. Accordingly, the lubricating oil reservoir 50 A can be provided without extending the housing 11 in the axial direction. It is therefore possible to prevent the housing 11 from being elongated in the axial direction and prevent the electric compressor 10 A from increasing in size.
- the pressure of the discharge port 16 A acts on oil within the lubricating oil reservoir 50 A through the pressure introduction path 61 , which feeds the lubricating oil to the sliding portion of the compression mechanism 20 . Accordingly, it is unnecessary to provide a pump for feeding lubricating oil, thus reducing the number of components.
- the pressure introduction path 61 allows the discharge port 16 A and lubricating oil reservoir 50 A to communicate with each other not through internal space of the rear case 12 . Accordingly, the pressure introduction path 61 can be used as an oil filling path.
- oil does not adhere to any component arranged in the internal space of the rear case 12 (the electric motor 30 in this example), whereby the oil can be filled in the lubricating oil reservoir 50 A more reliably.
- the pressure introduction path 61 allowing the discharge port 16 A and lubricating oil reservoir 50 A to communicate with each other is formed to be downwardly inclined. Accordingly, the oil separated from the refrigerant at the discharge port 16 A is naturally fed by gravity to the lubricating oil reservoir 50 A through the pressure introduction path 61 . It is more effective that the discharge port 16 is provided with an oil separator.
- FIG. 3 the harness 44 from the connection terminal 45 is partially shown, and some of the constituent parts within the front case are omitted.
- the present invention is not limited to the aforementioned embodiments and can be variously modified.
- the present invention is not limited to the electric compressor used for a refrigeration cycle of the air conditioner, and the fluid treated in the electric compressor is not limited to the refrigerant.
- the compressor may be an eccentric roller type rotary compressor or may be other than the rotary compressors.
- the present invention is available for electric compressors.
Abstract
A lubricating oil reservoir provided at the bottom of a housing is placed under the compression mechanism or electric motor in the vicinity of the mounting bracket provided on the lower outside of a middle case. The lubricating oil reservoir can be provided efficiently using dead space formed under the compression mechanism in the housing, and the rigidity of the mounting bracket can secure the strength of the lubricating oil reservoir.
Description
- The present invention relates to an electric compressor integrally including a compression mechanism and an electric motor.
- In one of conventionally known electric compressors, a compression mechanism and an electric motor driving the same are accommodated in a housing, at the bottom of which a reservoir of lubricating oil for lubrication of required lubrication portions of the compression mechanism is provided.
- Patent Literature 1 discloses a transverse-mounted electric compressor. In such a structure, for example, part of the housing accommodating the electric motor is extended axially outward, and the lubricating oil reservoir is provided for the extended part. The lubricating oil within the reservoir is supplied to the required lubrication portions of the compression mechanism, and the lubricating oil is returned to the lubricating oil reservoir.
- However, in such a conventional electric compressor, the lubricating oil reservoir is provided for the axially extended part of the housing. The housing is inevitably elongated in the axial direction, thus resulting in an increase in size of the electric compressor.
- The lubricating oil reservoir is provided at the portion of the housing just extended. Accordingly, it is necessary to employ a reinforcing structure, such as increasing wall thickness of the housing or providing a reinforcement rib, in order to reinforce the lubricating oil reservoir, thus causing an increase in weight.
- An object of the present invention is to provide an electric compressor in which the lubricating oil reservoir can be reinforced using an existing constituent member while the housing is prevented from being elongated in the axial direction.
- In the present invention, an electric compressor includes: a housing accommodating at least a compression mechanism and an electric motor driving the compression mechanism; and a mounting bracket protruded at least at lower outside of the housing, in which a lubricating oil reservoir provided at the bottom of the housing is placed under the compression mechanism or electric motor in the vicinity of the mounting bracket.
- Moreover, in the present invention, the electric compressor further includes: a discharge port opened in the housing, through which fluid compressed by the compression mechanism is discharged to the outside of the housing; a pressure introduction path allowing the discharge port and lubricating oil reservoir to communicate with each other; and a lubricating oil feeding path allowing the lubricating oil reservoir and a sliding portion of the compression mechanism to communicate with each other.
-
FIG. 1 is a perspective view of a whole electric compressor according to a first embodiment of the present invention. -
FIG. 2 is a longitudinal section view of the electric compressor according to the first embodiment of the present invention. -
FIG. 3 is a longitudinal section view of an electric compressor according to a second embodiment of the present invention. -
FIG. 4 is a cross section view taken along a line IV-IV ofFIG. 3 . -
FIG. 5 is a rear view of the electric compressor according to the second embodiment of the present invention. - Hereinafter, a description is given of preferred embodiments of the present invention in detail with reference to the drawings. The embodiments are examples of an electric compressor applied to a refrigeration cycle of an air conditioner of a vehicle. In this case, fluid compressed by the electric compressor is a refrigerant of the refrigeration cycle.
-
FIG. 1 is a perspective view of a whole electric compressor according to a first embodiment of the present invention, andFIG. 2 is a longitudinal section view of the electric compressor. - In an
electric compressor 10 according to this embodiment, as shown inFIGS. 1 and 2 , arear case 12, amiddle case 13, and afront case 14, which are separated in the axial direction (in the horizontal direction ofFIG. 2 ), are joined to each other to constitute ahousing 11. As shown inFIG. 2 , themiddle case 13 accommodates acompression mechanism 20; therear case 12 accommodates anelectric motor 30; and thefront case 14 accommodates amotor drive circuit 40 controlling energization of theelectric motor 30. - As shown in
FIG. 1 , refrigerant introduced into thehousing 11 through anintroduction port 15 formed in themiddle case 13 is compressed by thecompression mechanism 20 and is then discharged through adischarge port 16 formed in therear case 12. - The
compression mechanism 20 is configured as a rotary type with vanes. Thecompression mechanism 20 schematically includes acylinder block 22, acompressor rotor 23, a plurality ofvanes 24, and inlet andoutlet side blocks cylinder block 22 includes acylinder chamber 21 formed in a non-circular shape with a smooth inner circumference as shown inFIG. 2 . Thecompressor rotor 23 is rotatably accommodated in thecylinder chamber 21. Thevanes 24 are provided on the outer circumference of thecompressor rotor 23 so as to be freely retracted and extended and are arranged circumferentially at predetermined intervals. The tips of thevanes 24 slide on the inner circumferential surface of thecylinder chamber 21. The inlet andoutlet side blocks cylinder block 22 in the axial direction and close both axial ends of thecylinder chamber 21. Thecompressor rotor 23 slides on the inlet andoutlet side blocks - In the
inlet side block 25 on the left side ofFIG. 2 , an inlet port (not shown) is formed so that the refrigerant introduced from theintroduction port 15 is introduced into thecylinder chamber 21 through the inlet port. In outer peripheral part of thecylinder block 22 or the rightoutlet side block 26, an outlet port (not shown) is formed, through which the compressed refrigerant in thecylinder chamber 21 is discharged. - Accordingly, in the
compression mechanism 20, thecompressor rotor 23 is rotated with adrive shaft 31 of theelectric motor 30 to change the circumferential volume of thecylinder chamber 21 while retracting and advancing thevanes 24. The refrigerant at low pressure which is sucked into thecylinder 21 through the inlet port is compressed, and the compressed refrigerant at high pressure is discharged through the outlet port. - The refrigerant at high pressure discharged from the outlet port passes through a channel between the inner circumference of the
middle case 13 and thecompression mechanism 20 and then passes through therear case 12 accommodating theelectric motor 30 to be discharged from thedischarge port 16. At this time, the refrigerant passing through therear case 12 cools part of theelectric motor 30 generating heat. - The
electric motor 30 includes acylindrical stator 32 pressed into and fixed to the inner circumference of therear case 12 and arotor 33 rotatably accommodated in thestator 32. A plurality of coil portions provided on thestator 32 circumferentially at constant intervals are energized to excite thestator 32, thus rotating therotor 33. - In the center of the
rotor 33, thedrive shaft 31 is inserted and engaged so as not to move relative to therotor 33 in a rotating direction. An end (the left end in the drawing) of thedrive shaft 31 is coupled with an end (the right end in the drawing) of thecompressor rotor 23 of thecompression mechanism 20 with anon-circular fitting portion 31S. The rotation of thedrive shaft 31 is thus transmitted to thecompressor rotor 23. - In the
middle case 13 side of thefront case 14, as shown inFIG. 2 , apartition wall 14W is provided. The other end of thefront case 14 is opened. The open end is closed by anend plate 14E after themotor drive circuit 40 is accommodated in thefront case 14 from the open side. - The
motor drive circuit 40 is provided with asubstrate 41. On thesubstrate 41, an inverter including electronic parts such as a switching device switching on and off of a circuit (for example, a MOS-FET, an IGBT, or the like) is mounted. - The
motor drive circuit 40 and the coil portions provided for thestator 32 of theelectric motor 30 are electrically connected through aharness 44. In the middle of theharness 44, ahermetic terminal 45 is provided. Theconnection terminal 45 is located within anupper space portion 11U formed by projecting upper part of the middle andfront cases - On the outside of the
housing 11,mounting brackets 17 are partially protruded, with which theelectric compressor 10 is mounted in an engine room, for example, on a cylinder block of the engine or the like. - The
mounting brackets 17 are protruded at total three places on the upper and lower outside of the middle case 13 (seeFIGS. 1 and 2 ) and an end of the rear case 12 (seeFIG. 2 ). Each of themounting brackets 17 is integrally protruded on the outer circumference of the middle orrear case mounting bracket 17, amounting hole 17 a is formed, through which a mounting bolt (not shown) is inserted so as to penetrate perpendicular to the axial direction of thehousing 11. - In this embodiment, a lubricating
oil reservoir 50 provided at the bottom of thehousing 11 is placed under thecompression mechanism 20 in the vicinity of the mounting bracket 17 (themounting bracket 17 provided at the lower outside of the middle case 13). - As shown in
FIG. 2 , at the bottom of thefront case 14, alower space portion 11L for accommodating anelectronic part 43 of themotor drive circuit 40 is projected so as to have a width W2 slightly smaller than a horizontal width W1 of theattachment bracket 17. The lubricatingoil reservoir 50 is formed between thelower space portion 11L and themounting bracket 17 so that bottom part of themiddle case 13 is projected to have a width W1 equal to themounting bracket 17. - At the bottom of the lubricating
oil reservoir 50, anopening 51 is formed which is air-tightly closed detachably with aplug 52. - On the other hand, in the
compression mechanism 20, arotation shaft 27 of thecompressor rotor 23 is rotatably supported through slidingbearings oil reservoir 50 to communicate with each other is formed. The lubricating oil within the lubricatingoil reservoir 50 is sucked into the sliding bearing 28R along with rotation of thecompressor rotor 23. - According to the
electric compressor 10 of this embodiment, the lubricatingoil reservoir 50 provided at the bottom of thehousing 11 is placed under thecompression mechanism 20. Accordingly, the lubricatingoil reservoir 50 can be provided by effectively using dead space within thehousing 11 formed under thecompression mechanism 20. The lubricatingoil reservoir 50 can be thus provided without extending thehousing 11 in the axial direction. It is therefore possible to prevent thehousing 11 from being elongated in the axial direction and prevent theelectric compressor 10 from increasing in size. - Moreover, the lubricating
oil reservoir 50 is placed in the vicinity of the mountingbracket 17 protruded on the lower outside of thehousing 11. Accordingly, the rigidity of the existing mountingbracket 17 can secure the strength of the lubricatingoil reservoir 50. It is therefore possible to prevent theelectric compressor 10 from increasing in weight. -
FIG. 3 is a longitudinal section view of an electric compressor according to the second embodiment of the present invention;FIG. 4 is a cross-section view along a line IV-IV ofFIG. 3 ; andFIG. 5 is a rear view of the electric compressor according to this embodiment. Anelectric compressor 10A according to this embodiment includes the same constituent elements as those of theelectric compressor 10 according to the first embodiment. Hereinafter, the same constituent elements are given the same reference numerals, and the redundant description is omitted. - The
electric compressor 10A according to this embodiment differs from the first embodiment (seeFIG. 2 ) in that two mountingbrackets housing 11 so as to be separated from each other in the axial direction. - More specifically, one of the mounting
brackets rear case 12, and the other mountingbracket 17 is protruded on the lower outside of themiddle case 13. - In this embodiment, a lubricating
oil reservoir 50A is provided across the rear andmiddle cases brackets - In this embodiment, the lubricating
oil reservoir 50A is provided under theelectric motor 30. - The lubricating
oil reservoir 50A communicates through apressure introduction path 61 with adischarge port 16A opened in the upper part of the rear end of therear case 12. Thispressure introduction path 61 penetrates through inside of the outer wall of therear case 12. - More specifically, the
pressure introduction path 61 includes avertical path 61 a extending downward from thedischarge port 16A opened in the upper part of the rear end of therear case 12 and ahorizontal path 61 b extending from the bottom end of thevertical path 61 a in the axial direction and communicating with the lubricatingoil reservoir 50A. - As shown in
FIG. 3 , a lubricatingoil introduction path 63 extended downward and opened to the outside of thehousing 11 is branched from the middle of thepressure introduction path 61. The opening of the lubricatingoil introduction path 63 is plugged with acap 64. - An oil path 62 (lubricating oil feeding path) which allows the front end (the left end in
FIG. 3 ) of the lubricatingoil reservoir 50A and a sliding portion (a bearing hole) of thecompression mechanism 20 to communicate with each other penetrates through inside of themiddle case 13 andside block 26 in this embodiment. - According to the
electric compressor 10A of this embodiment, the lubricatingoil reservoir 50A is provided between the mountingbrackets housing 11, thus achieving an efficient use of dead space. Accordingly, the lubricatingoil reservoir 50A can be provided without extending thehousing 11 in the axial direction. It is therefore possible to prevent thehousing 11 from being elongated in the axial direction and prevent theelectric compressor 10A from increasing in size. - Moreover, the pressure of the
discharge port 16A acts on oil within the lubricatingoil reservoir 50A through thepressure introduction path 61, which feeds the lubricating oil to the sliding portion of thecompression mechanism 20. Accordingly, it is unnecessary to provide a pump for feeding lubricating oil, thus reducing the number of components. - The
pressure introduction path 61 allows thedischarge port 16A and lubricatingoil reservoir 50A to communicate with each other not through internal space of therear case 12. Accordingly, thepressure introduction path 61 can be used as an oil filling path. When filling oil into the lubricatingoil reservoir 50A through thedischarge port 16A, oil does not adhere to any component arranged in the internal space of the rear case 12 (theelectric motor 30 in this example), whereby the oil can be filled in the lubricatingoil reservoir 50A more reliably. - In this embodiment, the
pressure introduction path 61 allowing thedischarge port 16A and lubricatingoil reservoir 50A to communicate with each other is formed to be downwardly inclined. Accordingly, the oil separated from the refrigerant at thedischarge port 16A is naturally fed by gravity to the lubricatingoil reservoir 50A through thepressure introduction path 61. It is more effective that thedischarge port 16 is provided with an oil separator. - In
FIG. 3 , theharness 44 from theconnection terminal 45 is partially shown, and some of the constituent parts within the front case are omitted. - Hereinabove, the description is given of the preferred embodiments of the present invention. However, the present invention is not limited to the aforementioned embodiments and can be variously modified. For example, the present invention is not limited to the electric compressor used for a refrigeration cycle of the air conditioner, and the fluid treated in the electric compressor is not limited to the refrigerant. Moreover, the compressor may be an eccentric roller type rotary compressor or may be other than the rotary compressors.
- The present invention is available for electric compressors.
Claims (2)
1. An electric compressor comprising:
a housing accommodating at least a compression mechanism and an electric motor driving the compression mechanism; and
a mounting bracket protruded at least at lower outside of the housing, wherein
a lubricating oil reservoir provided at the bottom of the housing is placed under the compression mechanism or electric motor in the vicinity of the mounting bracket.
2. The electric compressor according to claim 1 , further comprising:
a discharge port opened in the housing, through which fluid compressed by the compression mechanism is discharged to the outside of the housing;
a pressure introduction path allowing the discharge port and lubricating oil reservoir to communicate with each other; and
a lubricating oil feeding path allowing the lubricating oil reservoir and a sliding portion of the compression mechanism to communicate with each other.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007039778 | 2007-02-20 | ||
JP2007039778 | 2007-02-20 | ||
JP2007183105A JP2008232134A (en) | 2007-02-20 | 2007-07-12 | Electric compressor |
JP2007183105 | 2007-07-12 | ||
PCT/JP2008/052513 WO2008102698A1 (en) | 2007-02-20 | 2008-02-15 | Electric compressor |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100074773A1 true US20100074773A1 (en) | 2010-03-25 |
Family
ID=39709975
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/442,493 Abandoned US20100074773A1 (en) | 2007-02-20 | 2008-02-15 | Electric compressor |
Country Status (4)
Country | Link |
---|---|
US (1) | US20100074773A1 (en) |
EP (1) | EP2113665A1 (en) |
JP (1) | JP2008232134A (en) |
WO (1) | WO2008102698A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150125322A1 (en) * | 2013-11-07 | 2015-05-07 | Jia Huei Microsystem Refrigeration Co., Ltd | Rotary compressor |
US20150211519A1 (en) * | 2012-07-26 | 2015-07-30 | Mikuni Corporation | Electric pump |
US20150275894A1 (en) * | 2012-07-26 | 2015-10-01 | Mikuni Corporation | Electric pump |
US20160153452A1 (en) * | 2014-11-28 | 2016-06-02 | Kabushiki Kaisha Toyota Jidoshokki | Motor-driven compressor |
US20170363109A1 (en) * | 2012-02-27 | 2017-12-21 | Magna Powertrain, Inc. | Oil controller for high temperature pump applications |
US11011956B2 (en) * | 2018-07-24 | 2021-05-18 | Toyota Jidosha Kabushiki Kaisha | Vehicle driving apparatus |
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US4576555A (en) * | 1984-11-13 | 1986-03-18 | Tecumseh Products Company | Oil dispersing device |
US7014437B2 (en) * | 2003-01-31 | 2006-03-21 | Hitachi, Ltd., Trustee, For The Benefit Of Hitachi Air Conditioning Systems Co., Ltd. | Screw compressor |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60184984A (en) * | 1985-01-30 | 1985-09-20 | Hitachi Ltd | Screw compressor |
JPH062684A (en) | 1992-06-17 | 1994-01-11 | Mitsubishi Heavy Ind Ltd | Horizontal type closed motor-driven compressor |
-
2007
- 2007-07-12 JP JP2007183105A patent/JP2008232134A/en active Pending
-
2008
- 2008-02-15 US US12/442,493 patent/US20100074773A1/en not_active Abandoned
- 2008-02-15 EP EP08711343A patent/EP2113665A1/en not_active Withdrawn
- 2008-02-15 WO PCT/JP2008/052513 patent/WO2008102698A1/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4576555A (en) * | 1984-11-13 | 1986-03-18 | Tecumseh Products Company | Oil dispersing device |
US7014437B2 (en) * | 2003-01-31 | 2006-03-21 | Hitachi, Ltd., Trustee, For The Benefit Of Hitachi Air Conditioning Systems Co., Ltd. | Screw compressor |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20170363109A1 (en) * | 2012-02-27 | 2017-12-21 | Magna Powertrain, Inc. | Oil controller for high temperature pump applications |
US20150211519A1 (en) * | 2012-07-26 | 2015-07-30 | Mikuni Corporation | Electric pump |
US20150275894A1 (en) * | 2012-07-26 | 2015-10-01 | Mikuni Corporation | Electric pump |
US9726174B2 (en) * | 2012-07-26 | 2017-08-08 | Mikuni Corporation | Electric pump |
US10066626B2 (en) * | 2012-07-26 | 2018-09-04 | Mikuni Corporation | Electric pump |
US20150125322A1 (en) * | 2013-11-07 | 2015-05-07 | Jia Huei Microsystem Refrigeration Co., Ltd | Rotary compressor |
US20160153452A1 (en) * | 2014-11-28 | 2016-06-02 | Kabushiki Kaisha Toyota Jidoshokki | Motor-driven compressor |
US9885359B2 (en) * | 2014-11-28 | 2018-02-06 | Kabushiki Kaisha Toyota Jidoshokki | Motor-driven compressor |
DE102015223401B4 (en) * | 2014-11-28 | 2019-09-19 | Kabushiki Kaisha Toyota Jidoshokki | Motor-driven compressor |
US11011956B2 (en) * | 2018-07-24 | 2021-05-18 | Toyota Jidosha Kabushiki Kaisha | Vehicle driving apparatus |
Also Published As
Publication number | Publication date |
---|---|
EP2113665A1 (en) | 2009-11-04 |
JP2008232134A (en) | 2008-10-02 |
WO2008102698A1 (en) | 2008-08-28 |
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Legal Events
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Owner name: CALSONIC KANSEI CORPORATION,JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WATANABE, TOSHIHARU;SATOU, YUTAKA;WATANABE, MASAKI;REEL/FRAME:022438/0307 Effective date: 20090316 |
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STCB | Information on status: application discontinuation |
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