JP2013241882A - Motor-driven compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven compressor capable of reducing operation noise.SOLUTION: A motor-driven compressor is formed by forming a turning scroll 12, a fixed scroll 11 and a main bearing member 51 from aluminum or an aluminum alloy, and is constituted so that an Oldham's ring 57 is formed of aluminum or an aluminum alloy, and alumite treatment is applied to a part for sliding with the fixed scroll 11 of the turning scroll 12 and the whole surface of the Oldham's ring 57. Thus, while avoiding contact by the same mutual metals of the respective sliding parts, a key of the Oldham's ring and a key groove of the turning scroll and the main bearing member are formed of a homogeneous material, a clearance of a key groove part is not changed by the operation temperature of the compressor, and the clearance of the key groove part can be further highly accurately set small, so that vibration is restrained, and the operation noise can be reduced.

Description

  The present invention relates to an electric compressor including a compression mechanism and an electric motor.

  Conventionally, this type of electric compressor has begun to be used as a compressor of an air conditioner for automobiles. In a hybrid automobile, the automobile is temporarily stopped by a signal or the like for the original purpose of reducing the influence of the engine on the environment. In some cases, the engine is stopped and only the compressor is operated. In such a case, there is a problem that even a minute vibration or operating sound of the compressor that has been buried in the engine sound in the past is transmitted as a discomfort sound to the driver or the occupant through the frame of the vehicle body.

  As one of the measures to reduce the noise of an electric compressor for mounting on a vehicle, vibration and noise are reduced and reduced by adjusting the width of the Oldham ring key part and the keyway width of the orbiting scroll and the bearing member. A technique for reducing noise is disclosed (for example, see Patent Document 1).

  FIG. 3 is a development view of the compression mechanism portion of the electric compressor described in Patent Document 1. The fixed scroll 101, the orbiting scroll 102, the bearing member 104 are made of an aluminum alloy, and the Oldham ring 103 is made of an iron-based material. The gap between the width of the Oldham ring key part and the key groove width of the orbiting scroll 102 and the bearing member 104 is made as small as possible from the viewpoint of noise and slidability.

JP 2007-23819 A

  However, in the conventional configuration, the Oldham ring 103 remains a ferrous material from the standpoint of seizure or the like, and if the temperature becomes high during operation of the compressor, the difference in thermal expansion is taken into account due to the difference in expansion coefficient due to the difference in material. Therefore, the gap between the key groove portions has to be set to be wide, and there is a problem that low noise cannot be sufficiently achieved.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an electric compressor in which an Oldham ring is made of an aluminum alloy, and a gap in a key groove portion is minimized with high accuracy to achieve low noise. It is a thing.

  In order to solve the above-described conventional problems, an electric compressor according to the present invention includes a turning scroll driven by a motor, a fixed scroll combined with the turning scroll, an end plate of the turning scroll, and a thrust surface of a main bearing member. And an Oldham ring configured to rotate while preventing rotation of the orbiting scroll, and the orbiting scroll, the fixed scroll, and the main bearing member are made of aluminum or aluminum. In an electric compressor formed of an alloy, the Oldham ring is formed of aluminum or an aluminum alloy.

Thereby, first, the Oldham ring is reduced in weight, so that vibration can be suppressed and driving noise can be reduced. Furthermore, since the Oldham ring key, the orbiting scroll, and the keyway of the main bearing member are made of the same material, the gap in the keyway is not changed by the operating temperature of the compressor. Therefore, vibration can be suppressed and driving noise can be reduced.

  The electric compressor of the present invention can reduce weight and driving noise without impairing reliability.

Sectional drawing of the electric compressor in Embodiment 1 of this invention Exploded sectional view showing the compression mechanism of the electric compressor Exploded sectional view showing a compression mechanism of a conventional electric compressor

  According to a first aspect of the present invention, there is provided an orbiting scroll driven by a motor, a fixed scroll combined with the orbiting scroll, an end plate of the orbiting scroll, and a thrust surface of a main bearing member. An inverter-integrated electric compressor comprising a compression mechanism portion configured by an Oldham ring that makes a turning motion while preventing the turning scroll, the fixed scroll, and the main bearing member from aluminum or an aluminum alloy The Oldham ring is formed of aluminum or an aluminum alloy.

  As a result, it is possible to set the clearance between the key of the Oldham ring and the key groove of the orbiting scroll and the main bearing member in consideration of only the slidability without taking into account the thermal expansion of the member. Driving noise can be reduced by reducing the gap with accuracy. Further, since the Oldham ring is reduced in weight, the impact sound of vibration is reduced, and further, driving noise can be reduced.

  In the second invention, in particular, the contact portion of the orbiting scroll of the first invention with the fixed scroll and the Oldham ring are subjected to alumite treatment. Contact between each other can be prevented, and seizure of the sliding portion can be suppressed.

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

(Embodiment 1)
FIG. 1 is a sectional view of an electric compressor according to Embodiment 1 of the present invention, and FIG. 2 is a development view showing a compression mechanism portion of the electric compressor.

  In this embodiment, a horizontal electric compressor that is installed sideways by a mounting leg 2 around the body of the electric compressor 1 is shown as an example.

In FIG. 1 and FIG. 2, the electric compressor 1 includes a compression mechanism portion 4 and a motor 5 that drives the compression mechanism portion 4 in the main body casing 3, and lubricates each sliding portion including the compression mechanism portion 4. A liquid storage section 6 for storing the liquid to be supplied is provided, and the motor 5 is driven by a motor drive circuit section such as an inverter (not shown). 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 refrigerant, 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 stored. Any electric compressor may be used as long as the liquid storage unit 6 is built in the main casing 3 and the motor 5 is driven by the motor drive circuit unit, and the following description does not limit the description of the scope of claims.

  The compression mechanism section 4 of the electric compressor 1 according to the present embodiment includes a compression space 10 formed by meshing the spiral wraps of the fixed scroll 11 and the orbiting scroll 12. The sub casing 80 is provided with suction, compression, and discharge to the external cycle of refrigerant returning from the external cycle by changing the volume with movement when the fixed scroll 11 is swung through 14. This is done through the suction port 8 and the discharge port 9 provided in the main casing 3.

  At the same time, the lubricating oil 7 stored in the liquid storage section 6 of the main casing 3 is driven by driving the pump 13 or the like with the driving shaft 14 or using the differential pressure in the main casing 3. 14 is supplied to the liquid reservoir 21 and the liquid reservoir 22 on the back surface of the orbiting scroll 12 as the orbiting scroll 12 is driven to rotate. In the example shown in the figure, first, the oil is supplied to the liquid reservoir 21, and a part of the lubricating oil 7 supplied to the liquid reservoir 21 is provided on the side rear surface of the outer peripheral portion of the orbiting scroll 12 and in the oil scroll 23 provided inside the orbiting scroll end plate 12 a. Then, the orbiting scroll 12 is backed up by back pressure by supplying to the basis of a predetermined restriction by the throttle portion 23a. Further, the lubricating oil 7 is supplied to a holding groove 25 that holds a tip seal 24 that is an example of a seal member between the fixed scroll 11 at the tip end by a lap oil supply passage 23b provided inside the spiral wrap 12c of the orbiting scroll 12. Thus, sealing and lubrication between the fixed scroll 11 and the orbiting scroll 12 are achieved. 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, the liquid reservoir 22 and the main bearing 42, and then flows out to the motor 5 side. It is collected into the liquid storage unit 6.

  Further, a main bearing member 51 having a pump 13, a sub-bearing 41, a motor 5, and a main bearing 42 is arranged from one end wall 3 a side in the axial direction in the main body casing 3. The pump 13 is housed from the outer surface of the end wall 3a and is held between the lid body 52 and the pump body 53 that is fitted thereafter, and a pump chamber 53 that communicates with the liquid storage section 6 is formed inside the lid body 52 to form a suction passage. 54 is connected to the liquid storage section 6 through 54. The auxiliary bearing 41 is supported by the end wall 3a, and the side connected to the pump 13 of the drive shaft 14 is supported. The motor 5 fixes the stator 5a to the inner periphery of the main body casing 3 by shrink fitting or the like, and the drive shaft 14 can be driven to rotate by the rotor 5b fixed around the drive shaft 14.

  The main bearing member 51 is fixed to the inner periphery of the sub casing 80 with bolts 17 or the like, 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 57 is provided between the main bearing member 51 and the orbiting scroll 12 for preventing the orbiting scroll 12 from rotating and causing a circular motion.

  An eccentric shaft 14a is integrally formed at the end 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 43a of the eccentric bearing 43 is fitted to the bush 30 and the outer ring 43b of the eccentric bearing 43 is loosely fitted to the cylindrical portion 12b with a slight gap.

The exposed portion of the compression mechanism section 4 from the sub casing 80 is covered with the main casing 3 which is fixed to the sub casing 80 and the opening by abutting the openings, and the end wall 80a opposite to the end wall 3a in the axial direction. Is forming. The compression mechanism unit 4 is located between the suction port 8 of the sub casing 80 and the discharge port 9 of the main casing 3, and its own suction port 16 is connected to the suction port 8 of the sub casing 80, and its own discharge port 31 is A discharge chamber 62 is formed between the reed valve 31a and the end wall 80a. The discharge chamber 62 is a motor 5 having a discharge port 9 between the compression mechanism portion 4 and the end wall 3a through the fixed scroll 11 and the main bearing member 51 or a communication passage 63 formed between them and the main body casing 3. To the side.

  As described above, the motor 5 is driven by the motor drive circuit section, and the compression mechanism section 4 is swung through the drive shaft 14 and the pump 13 is driven. At this time, the compression mechanism section 4 is supplied with the lubricating oil 7 of the liquid storage section 6 by the pump 13 and is subjected to lubrication and sealing action, while passing through the suction port 8 of the subcasing 80 and the suction port 16 provided in its fixed scroll 11. The return refrigerant from the refrigeration cycle is sucked and compressed, and discharged from its own discharge port 31 to the discharge chamber 62. The refrigerant discharged into the discharge chamber 62 enters the motor 5 side through the communication passage 63, and in the process until the motor 5 is cooled and discharged from the discharge port 9 of the main body casing 3, the refrigerant is a gas-liquid such as a collision or a throttle. The secondary bearing 41 is also lubricated by the accompanying partial lubricating oil 7 while being separated and receiving the lubricating oil 7.

  Here, in the present embodiment, the Oldham ring 57 as well as the orbiting scroll 12, the fixed scroll 11, and the main bearing member 51 are formed of aluminum or an aluminum alloy. Further, the sides of the spiral wrap 12c of the orbiting scroll 12, the spiral wrap 12c side of the orbiting scroll end plate 12a and the fixed scroll 11, the key groove portion 12d side of the orbiting scroll end plate 12a, the Oldham ring 57, and the key groove portion of the main bearing member 51. Since the 51a side and the Oldham ring 57 are in contact with each other and perform a sliding motion, the portion of the orbiting scroll 12 that slides with the fixed scroll 11 and the entire surface of the Oldham ring 57 are provided in order to prevent seizure between the metals. Alumite treatment has been performed.

  As a result, the Oldham ring 57 is made of aluminum to reduce the weight, so even if the Oldham ring 57 vibrates during operation, the impact value due to the vibration is reduced, so that the operating noise is reduced. Can be reduced. Further, since the key of the Oldham ring 57 and the key groove of the orbiting scroll 12 and the main bearing member 51 are made of the same material, the gap of the key groove is not changed by the operating temperature of the compressor. It is possible to set a smaller value with higher accuracy, further suppressing vibration and reducing driving noise. In addition, vibration can be further suppressed by reducing the weight of the Oldham ring 57, and weight reduction of the electric compressor itself can be promoted.

  In the above embodiment, the description has been given by taking as an example an electric compressor that does not include an inverter circuit for driving the motor 5 in the compressor itself. However, an inverter that includes a motor drive circuit such as this inverter circuit integrally in the compressor. Even if it is an integral type electric compressor, the same effect is acquired by comprising similarly.

  As described above, the inverter-integrated electric compressor according to the present invention is capable of reducing the weight and reducing the operation noise while maintaining the reliability. It can be widely applied to various refrigeration equipment such as heat pumps and heat pump water heaters.

DESCRIPTION OF SYMBOLS 1 Electric compressor 3 Main body casing 4 Compression mechanism part 5 Motor 11 Fixed scroll 12 Orbiting scroll 12a Orbiting scroll end plate 12b Cylindrical part 12c Spiral wrap 12d Key groove part 51 Main bearing member 51a Key groove part 57 Oldham ring

Claims (2)

The orbiting scroll driven by the motor, the fixed scroll combined with the orbiting scroll, and the orbiting scroll is disposed between the end plate of the orbiting scroll and the thrust surface of the main bearing member to prevent the orbiting scroll from rotating. An electric compressor including a compression mechanism configured by an Oldham ring is formed, wherein the orbiting scroll, the fixed scroll, the Oldham ring, and the main bearing member are formed of aluminum or an aluminum alloy. Electric compressor. 2. The electric compressor according to claim 1, wherein an alumite treatment is applied to a contact portion of the orbiting scroll with the fixed scroll and the entire surface of the Oldham ring.