JPH0932729A - Motor-driven compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively cool a stator, and also to uniformly pass a gas into a plurality of gas passages by providing a gas inlet port on the end surface of a motor side, and by providing a plurality of gas passages that penetrate the stator of an electric motor from one end to the other end. SOLUTION: A gas inlet port 44 is provided to the end surface of a housing 4 on the motor side in the vicinity of a subbearing 51, and a plurality of gas passages 60 penetrating from the right end to the left end are perforated at intervals in the stator Mb of an electric motor M. During the operation of a motor-driven compressor, when the electric motor M is driven, a revolving scroll 2 makes revolutional turning because an Oldham's ring 6 prevents the rotation. Then, a greater part of a low-temperature coolant gas enters a low- temperature chamber 48, and the remaining part thereof passes through the clearance of the subbearing 51 for cooling it, and the subbearing 51 is lubricated by mist-shaped lubricating oil. Thus, the flow resistance of gas can be reduced, and also the stator of the motor is effectively cooled, and the gas is uniformly passed through a plurality of gas passages.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric compressor suitable for refrigeration equipment such as an air conditioner.

[0002]

2. Description of the Related Art One example of a conventional scroll compressor is shown in FIG.
Is shown in In FIG. 2, reference numeral 4 denotes a housing, which includes a cup-shaped right housing 49, a frame 5, and a cup-shaped left housing 43, which are fastened together by bolts 56. An electric motor M is provided inside the right housing 49, and a scroll compression mechanism C is provided inside the left housing 43.

The electric motor M and the compression mechanism C are interlockingly connected to each other via a rotary shaft 3. Rotating shaft 3
Has a right end supported by a right end surface of the right housing 49 via a sub-bearing 51, and a left end supported by the frame 5 via a main bearing 52.

The electric motor M includes a rotor Ma and a stator Mb.
And the rotor Ma is fixed to the rotary shaft 3,
The stator Mb is fixed by being pressed into the right housing 49.

The scroll type compression mechanism C comprises a fixed scroll 1, an orbiting scroll 2, an Oldham link 6 for preventing the orbiting scroll 2 from rotating.

The fixed scroll 1 comprises an end plate 11 and a spiral wrap 12 provided upright on the inner surface of the end plate 11. The outer peripheral surface of the end plate 11 is brought into close contact with the inner peripheral surface of the left housing 43 to bring the end plate 11 into contact. A discharge chamber 46 is formed on the left side of the
47 is limited.

A discharge port 13 is formed in the center of the end plate 11, and the discharge port 13 is opened and closed by a discharge valve 17. The fixed scroll 1 is fastened to the left housing 43 by screwing a bolt 57 into the protrusion 15 protruding leftward from the outer surface of the end plate 11.

The orbiting scroll 2 is provided with an end plate 21 and a spiral wrap 22 erected on the inner surface of the end plate 21, and a drive bush 32 is provided in an orbiting bearing 34 in a boss 23 erected on the outer surface of the end plate 21. It is rotatably fitted through. An eccentric drive pin 31 eccentrically provided at the left end of the rotary shaft 3 is slidably fitted in a slide groove 33 formed in the drive bush 32.

An Oldham link 6 is interposed between the end plate 21 and the frame 5, and the outer surface of the end plate 21 is in sliding contact with the left end surface of the frame 5 via a thrust bearing 53.

A plurality of closed spaces 24 are formed by eccentric the fixed scroll 1 and the orbiting scroll 2 with respect to each other by a predetermined distance and meshing them by shifting the angle by 180 degrees.

When the electric motor M is driven, the rotary shaft 3, the eccentric drive pin 31, the drive bush 32, and the slewing bearing 3 are driven.
The orbiting scroll 2 is driven via an orbiting drive mechanism including a boss 23, and the orbiting scroll 2 revolves on a circular orbit having an orbiting radius while being prevented from rotating by the Oldham link 6.

Then, the refrigerant gas containing mist-like lubricating oil enters the low pressure chamber 48 through the suction port 44, and this gas passes through the passage 58 provided on the outer periphery of the stator Mb and the gap 59 between the stator Mb and the rotor Ma. After cooling the electric motor M in the process of passing, the electric motor M is sucked into the closed space 24 through the passage 54 and the suction chamber 47 provided in the frame 5.

As the volume of the closed space 24 decreases due to the orbiting motion of the orbiting scroll 2, the compressed space reaches the central portion while being compressed, and passes through the discharge port 13 from the central portion.
The discharge valve 17 is pushed open to be discharged into the discharge chamber 46, and then discharged to the outside through the discharge port 45.

[0014]

In the above-described conventional electric compressor, during its operation, the refrigerant gas containing mist-like lubricating oil enters the low pressure chamber 48 through the suction port 44, and the stator Mb of the electric motor M is discharged. Although the electric motor M is cooled in the process of passing through the passage 58 provided on the outer periphery and the gap 59 between the stator Mb and the rotor Ma, the electric motor M cannot be cooled sufficiently and the passage 58 and the gap 59 are provided. There is a problem that the pressure loss of the refrigerant gas is large because the flow-through resistance when flowing through is large.

[0015]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above problems, and is characterized in that a gas inlet is provided on the motor-side end surface of a housing and an electric motor The stator has a plurality of gas passages extending from one end to the other end.

During operation of the electric compressor, gas is sucked into the housing through the suction port and is sucked into the compression mechanism through a plurality of gas passages provided in the stator of the electric motor.

If the end portion of the rotating shaft on the electric motor side is supported by the end surface of the housing on the motor side via a bearing and an intake port is provided in the vicinity of this bearing, the bearing is cooled by gas and lubricated at the same time. In addition, the gas can flow into the plurality of gas passages substantially evenly.

[0018]

DETAILED DESCRIPTION OF THE INVENTION One embodiment of the present invention is shown in FIG. On the right end surface of the right housing 49, that is, on the motor side end surface of the housing 4, a gas suction port 44 is provided in the vicinity of the sub bearing 51. The stator Mb of the electric motor M is provided with a plurality of gas passages 60 penetrating from the right end to the left end thereof at appropriate intervals in the circumferential direction.

The passage 58 on the outer periphery of the stator Mb is omitted. The other configuration is the same as that of the conventional one shown in FIG. 2, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

However, when the electric motor M is driven during operation of the electric compressor, the orbiting scroll 2 is passed through the rotating shaft 3, the eccentric pin, the drive bush 32, and the orbiting bearing 34.
Is driven, and the orbiting scroll 2 revolves revolving by being prevented from rotating by the Oldham link 6.

Then, a low-temperature refrigerant gas containing mist-like lubricating oil enters the low-pressure chamber 48 for the most part through the suction port 4,
The remaining portion flows through the gap of the sub-bearing 51 to cool it and at the same time lubricates it with mist-like lubricating oil contained in the refrigerant gas.

The refrigerant gas entering the low pressure chamber 48 is an electric motor M.
A plurality of gas passages 60 passing through the stator Mb of the
After cooling the electric motor M in the process of passing through the gap 59 between the Mb and the rotor Ma, the electric motor M is sucked into the closed space 24 through the passage 54 and the suction chamber 47 and compressed. The compressed gas passes through the discharge port 13, pushes open the discharge valve 17 and is discharged into the discharge chamber 46, and then flows out through the discharge port 45 to the outside.

[0023]

According to the present invention, since the gas suction port is provided on the motor side end surface of the housing and the plurality of gas passages penetrating from one end to the other end of the stator of the electric motor are provided, the gas suction port is introduced into the housing. Since the sucked gas passes through a plurality of gas passages penetrating the stator of the electric motor, the flow resistance of the gas is reduced and the stator of the electric motor can be effectively cooled in the process of passing through the plurality of gas passages. it can.

If the end portion of the rotary shaft on the electric motor side is supported by the end surface of the housing on the motor side via a bearing and an intake port is provided in the vicinity of this bearing, the bearing is cooled by gas and lubricated at the same time. In addition, the gas can flow into the plurality of gas passages substantially evenly.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an electric compressor according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional electric compressor.

[Explanation of symbols]

 4 Housing C Compression mechanism M Electric motor Mb Stator 60 Gas passage 3 Rotating shaft 51 Bearing 44 Suction port

Claims (2)

[Claims] 1. An electric compressor comprising a compression mechanism and an electric motor connected to the compression mechanism via a rotary shaft in a housing, wherein a gas inlet is provided on a motor side end surface of the housing and the electric An electric compressor characterized in that a stator of a motor is provided with a plurality of gas passages penetrating from one end to the other end thereof. 2. The electric motor side end of the rotary shaft is supported on the motor side end surface of the housing through a bearing, and the suction port is provided in the vicinity of the bearing. Electric compressor.