JP5136018B2 - Electric compressor - Google Patents

Description

  The present invention relates to an electric compressor in which a compression mechanism portion that sucks, compresses and discharges fluid and a motor that drives the compression mechanism portion are housed in a container, and the motor is driven by a motor drive circuit. .

Conventionally, as a technique for constructing an oil supply device for this type of compressor, as shown in FIG. 2, the end of the drive shaft on the side opposite to the compression mechanism is fitted to the gear accommodated in the pump case, and then attached. A pump cover that is held by a pump plate and further includes an oil sump chamber and an oil suction nozzle for introducing lubricating oil into the gear pump has been conventionally used (see, for example, Patent Document 1).
JP 09-324781 A

  However, in the conventional configuration, many parts are required to configure the oil supply apparatus, and there is a problem that the number of assembling steps and material costs increase.

  The present invention solves the above-described conventional problems, and an object thereof is to provide an electric compressor in which an oil sump chamber and an oil suction nozzle are integrally formed in a sub-container and the number of parts and assembly man-hours of an oil supply device are reduced. And

  In order to solve the above-described conventional problems, a compressor according to the present invention compresses and discharges a refrigerant sucked into a compression chamber connected to a motor in a main container and a motor via a drive shaft. In an electric compressor in which a sub-container is mounted in a form facing the motor side opening of the main container, including an oil supply device that supplies lubricating oil to the compression mechanism at the motor side end of the main container, An oil sump chamber for introducing lubricating oil into the oil supply device and an oil suction passage are integrally formed in the sub-container. As a result, the number of parts and assembly man-hours of the fueling device can be reduced.

  The electric compressor of the present invention can reduce the number of parts of the oil supply device and reduce the cost.

  According to a first aspect of the present invention, a motor and a compression mechanism that compresses and discharges a refrigerant sucked into a compression chamber connected to the motor via a drive shaft are accommodated in the main container, and the motor side end of the main container In an electric compressor having an oil supply device for supplying lubricating oil to the compression mechanism portion and a sub-container mounted so as to face the motor side opening of the main container, an oil reservoir chamber for introducing the lubricating oil into the oil supply device In addition, since the oil suction passage is formed integrally with the sub-container, the number of parts and assembly man-hours of the oil supply device can be reduced, and the cost can be reduced.

  In the second invention, in particular, the sealability of the oil sump chamber is improved by interposing a seal member on the joint surface between the outer periphery of the oil sump chamber integrally formed with the sub-container of the first invention and the main container. The refrigerant gas can be prevented from entering the lubricating oil, and the reliability can be improved.

  In the third invention, in particular, the sub-container of the first and second inventions is molded from a cast product, so that the oil sump chamber and the oil suction passage can be easily integrated, and the cost can be reduced. .

  Hereinafter, an embodiment of the present invention will be described with reference to FIG. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a cross-sectional view of an electric compressor according to first to third embodiments of the present invention.

  FIG. 1 shows an example of a horizontal electric compressor installed sideways by a mounting leg 2 around the body of the electric compressor 1. The electric compressor 1 is compressed in its main container 3. A mechanism section 4 and a motor 5 for driving the mechanism section 4 are built in, and an oil supply device 19 for supplying a liquid for lubrication of each sliding section including the compression mechanism section 4 is provided. The motor 5 is driven by a motor drive circuit section (not shown). I am doing so. A discharge sub-container 80 and a suction sub-container 70 are mounted on the motor-side opening 3a and the compression mechanism-side opening 3b of the main container 3 so as to face the opening, respectively, thereby forming a sealed container.

  The refrigerant to be handled is a gas refrigerant, and a liquid such as a lubricating oil 7 is employed as a liquid to be used for lubrication of each sliding part and a seal of the sliding part of the compression mechanism part 4. The lubricating oil 7 is compatible with the refrigerant. However, the present invention is not limited to these. Basically, a compression mechanism portion 4 that sucks, compresses and discharges liquid, a motor 5 that drives the compression mechanism portion 4, and a liquid that is used for lubrication of each sliding portion including the compression mechanism portion 4 is supplied. It is only necessary to use the electric compressor 1 in which the oil supply device 19 is built in the main container 3, the sub-containers 80 and 70 are attached to both end openings 3 a and 3 b of the main container 3, and the motor 5 is driven by the motor drive circuit unit The following description does not limit the description of the claims.

  The compression mechanism section 4 of the electric compressor 1 according to the present embodiment is of a scroll type as an example, and a compression space 10 formed by meshing a fixed scroll 11 and a turning scroll 12 as shown in FIG. However, when the orbiting scroll 12 is reciprocated with respect to the fixed scroll 11 by the motor 5 via the drive shaft 14, the refrigerant suction, compression, and external cycle are returned from the external cycle by changing the volume with movement. Is discharged through the suction port 8 provided in the suction sub-container 70 and the discharge port 9 provided in the discharge sub-container 80.

  At the same time, the lubricating oil 7 stored in the liquid storage section 6 of the discharge sub-container 80 is driven by driving the gear pump 13 or the like with the drive shaft 14 or using the differential pressure in the main container 3. Along with the turning drive of the orbiting scroll 12 through the oil supply passage 15 of the shaft 14, it is supplied to the liquid reservoir 21 on the back surface of the orbiting scroll 12, and a part of the lubricating oil 7 supplied to this liquid reservoir 21 is wrapped around the outer peripheral portion of the orbiting scroll 12. The back pressure chamber 20 on the opposite surface is supplied to a predetermined restriction base such as a throttle 23 through the orbiting scroll end plate 12a, and the back pressure led here is adjusted to a predetermined amount by a valve device (not shown) provided on the fixed scroll 11. Then, while pressing the orbiting scroll 12 and backing it up, the lubricant 7 is passed through the orbiting scroll 12 and the sealing member between the spiral scroll of the orbiting scroll 12 and the fixed scroll 11 at the tip. Fixed and supplied to the holding grooves 25 for holding the tip seal 24 is one example, promote sealing and lubrication between the orbiting scroll 11. Further, another part of the lubricating oil 7 supplied to the liquid reservoir 21 lubricates the bearings 42 and 43 through the eccentric bearing 43 and the main bearing 42, and then flows out to the motor 5 side. Is recovered.

  Further, a main bearing member 51 having an oil supply device 19, a sub bearing 41, a motor 5, and a main bearing 42 is arranged from the end wall 3 c side in the motor side axial direction in the main container 3.

  The oil supply device 19 accommodates the gear pump 13 from the outer surface of the end wall 3c and holds it with a pump plate 52 attached by bolts (not shown) after that. An oil reservoir chamber 53 is formed so as to communicate with the liquid storage section 6 through an oil suction passage 54.

  The auxiliary bearing 41 is supported by the end wall 3c, and the side connected to the gear pump 13 of the drive shaft 14 is supported. The motor 5 fixes the stator 5a to the inner periphery of the main container 3 by bolts or shrink fitting, and the drive shaft 14 can be rotationally driven by the rotor 5b fixed around the drive shaft 14. The main bearing member 51 is inserted or press-fitted into the main container 3, and the compression mechanism portion 4 side of the drive shaft 14 is supported by the main bearing 42. The fixed scroll 11 is attached to the outer surface of the main bearing member 51 with a bolt or the like (not shown), and the orbiting scroll 12 is sandwiched between the main bearing member 51 and the fixed scroll 11 to constitute a scroll compressor. An Oldham ring 26 is provided between the main bearing member 51 and the orbiting scroll 12 to prevent the orbiting scroll 12 from rotating and to orbit. An eccentric shaft 14a is integrally formed on the end surface of the drive shaft 14, and a bush 30 is fitted and supported on the eccentric shaft 14a. The orbiting scroll 12 is supported by the bush 30 via an eccentric bearing 43 so as to be capable of orbiting movement so as to face the fixed scroll 11. A cylindrical portion 12b projects from the rear surface of the orbiting scroll end plate 12a of the orbiting scroll 12, and the eccentric bearing 43 is accommodated in the cylindrical portion 12b. The inner ring of the eccentric bearing 43 is fitted into the bush 30 and the outer ring of the eccentric bearing 43 is fitted into the cylindrical portion 12b. The fixed scroll 11 is provided with a valve device that cuts off communication between the back pressure chamber 20 and a suction port (not shown).

  The compression mechanism unit 4 is covered with a suction sub-container 70 that is in contact with the main container 3 and the openings and fixed with a bolt (not shown). The compression mechanism 4 is located between the suction port 8 of the suction sub-container 70 and the discharge port 9 of the discharge sub-container 80, and its own suction port is connected through the suction port 8 of the suction sub-container 70 and the suction passage 16. In addition, its own discharge port 31 opens into the discharge chamber 62 via the reed valve 32. The discharge chamber 62 communicates with the motor 5 side between the compression mechanism portion 4 and the end wall 3c through the fixed scroll 11 and the main bearing member 51 or a communication passage 63 formed between them and the main container 3.

  The lead wire 5c of the motor 5 is drawn to the suction sub-container 70 side through the fixed scroll 11 and the main bearing member 51 or a communication passage 64 formed between them and the main container 3, and is sealed in the suction sub-container 70. The terminal 90 is connected. Further, the sealing terminal 90 is connected to a motor drive circuit (not shown).

  As described above, the motor 5 is driven by the motor drive circuit unit, and rotates the compression mechanism unit 4 via the drive shaft 14 and drives the gear pump 13. At this time, the compression mechanism section 4 is supplied with the lubricating oil 7 of the liquid storage section 6 by the gear pump 13 and is provided with the suction port 8 of the suction sub-container 70 and the fixed scroll 11 thereof while receiving the lubrication, sealing and pressing action. The return refrigerant from the refrigeration cycle is sucked through a suction port (not shown), compressed, and discharged from its own discharge port 31 to the discharge chamber 62. The refrigerant discharged into the discharge chamber 62 enters the electric motor 5 side through the communication passage 63, and in the process until the refrigerant is discharged from the discharge port 9 of the discharge sub-container 80 while cooling the motor 5, the refrigerant collides, throttles, etc. The sub-bearing 41 is also lubricated by the accompanying part of the lubricating oil 7 while the gas-liquid separation is performed and the lubricating oil 7 is separated.

  Here, in this embodiment, as shown in FIG. 1, the basic configuration is that the oil reservoir chamber 53 and the oil suction passage 54 constituting the oil supply device 19 are formed integrally with the discharge sub-container 80.

  According to the above configuration, there is no need to specially provide the oil sump chamber 53 and the oil suction passage 54. Therefore, the number of parts and the number of assembly steps can be reduced, and the cost can be reduced.

  Further, in this embodiment, the sealing performance of the oil sump chamber 53 is improved by interposing the seal member 91 on the joint surface between the outer periphery of the oil sump chamber 53 integrally formed with the discharge sub-container 80 and the main container 3. And since refrigerant gas permeation into lubricating oil can be prevented and sufficient lubricating oil can be supplied to a sliding part, a highly reliable electric compressor can be provided.

  Further, in the present embodiment, since the discharge sub-container 80 is molded as a cast product, the oil sump chamber 53 and the oil suction passage 54 can be easily integrated, the structure is simple, and the cost can be reduced. Moreover, the weight of the electric compressor can be reduced by adopting an aluminum casting.

  As described above, the electric compressor according to the present invention can reduce the number of parts of the oil supply device and reduce the cost. Therefore, in addition to refrigeration equipment such as an air conditioner and a refrigerator, a dehumidifier and a dryer. It can also be applied to uses such as heat pump hot water heaters.

Sectional drawing of the electric compressor in embodiment of this invention Cross section of a conventional electric compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric compressor 2 Mounting leg 3 Main container 3a Motor side opening 3b Compression mechanism side opening 3c End wall 4 Compression mechanism part 5 Motor 5a Stator 5b Rotor 5c Lead wire 6 Liquid storage part 7 Lubricating oil 8 Inhalation Port 9 Discharge port 10 Compression space 11 Fixed scroll 12 Orbiting scroll 12a Orbiting scroll end plate 12b Tube portion 13 Gear pump 14 Drive shaft 14a Eccentric shaft 15 Oil supply passage 16 Suction passage 19 Oil supply device 20 Back pressure chamber 21 Liquid reservoir 23 Restriction 24 Chip seal 25 Retaining groove 26 Oldham ring 30 Bush 31 Fixed scroll discharge port 32 Reed valve 41 Sub bearing 42 Main bearing 43 Eccentric bearing 51 Main bearing member 52 Pump plate 53 Oil reservoir chamber 54 Oil intake passage 62 Discharge chamber 63 Connection passage 64 Connection passage 65 Connection space 70 Suction sub container 80 Defuku container 90 sealed terminal 91 sealing member

Claims (2)

A motor and a compression mechanism that compresses and discharges the refrigerant sucked into a compression chamber connected to the motor via a drive shaft are housed in the main container, and the compression is performed on the motor side end of the main container. In an electric compressor having an oil supply device for supplying lubricating oil to a mechanism portion and having a sub-container mounted so as to face the motor side opening of the main container, an oil reservoir chamber for introducing the lubricating oil into the oil supply device; the oil suction passage to said secondary container a formed electrodeposited dynamic compressor integrally,
An electric compressor characterized in that a seal member is interposed between the outer periphery of an oil sump chamber formed integrally with the sub-container and the main container . The electric compressor according to claim 1, wherein the sub container is a cast product.