JPH062683A - Horizontal type closed motor-driven compressor - Google Patents

Abstract

PURPOSE:To increase space lower than a rotor of an electric motor, and solve the lack of lubricating oil by arranging the inside diametrical center of a stator of the electric motor to drive a compression mechanism housed in a closed housing so as to be made eccentric upward to the outside diametrical center. CONSTITUTION:This motor-driven compressor houses a scroll type compression mechanism C and an electric motor M in a closed housing 8, and these are connected to each other through a rotary shaft 5 extending horizontally. Lubricating oil 57 is sucked by means of an oil suction pipe 56 by driving an oil pump 51 according to rotation of the rotary shaft 5, and is returned to the bottom part of the closed housing 8 from an oil discharge hole 62 after respective bearings 71-73 and so on are lubricated through an oil feed hole 52. In this case, the inside diametrical center of a stator Mb of the electric motor M is made more eccentric upward by a prescribed distance than the outside diametrical center. Thereby, since space below a rotor Ma of the electric motor M is enlarged, a large quantity of lubricating oil can be stored in this space, so that seizure and so on caused by the lack of lubricating oil can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal hermetic electric compressor.

[0002]

2. Description of the Related Art An example of a conventional horizontal type hermetic electric compressor is shown in FIGS. A scroll type compression mechanism C and an electric motor M are built in the closed housing 8, and these are interlockingly connected to each other via a rotary shaft 5 extending substantially horizontally. The electric motor M includes a rotor Ma and a stator Mb, the rotor Ma is fixed to the rotating shaft 5, and the stator Mb is fixed to the hermetic housing 8.

The scroll type compression mechanism C includes a fixed scroll 1, a revolving scroll 2, a revolving orbiting motion of the revolving scroll 2, but a rotation preventing mechanism 3 such as an Oldham link for preventing its rotation, a frame 6 and the like. The front end of the rotary shaft 5 is pivotally supported on the frame 6 via a front bearing 71, and the rear end is pivotally supported on the stay 33 via a rear bearing 72.

The fixed scroll 1 is provided with an end plate 11 and a spiral wrap 12 provided upright on the inner surface of the end plate 11, and a discharge port 13 is provided at the center of the end plate 11.

The orbiting scroll 2 is provided with an end plate 21 and a spiral wrap 22 provided upright on the inner surface of the end plate 21, and a drive bush 54 is provided in the boss 23 provided upright on the outer surface of the end plate 21. It is rotatably inserted through. An eccentric pin 53 protruding from the front end of the rotary shaft 5 is rotatably fitted in the drive bush 54.

The fixed scroll 1 and the orbiting scroll 2 are eccentric with respect to each other by a predetermined distance, and are engaged with each other by shifting the angle by 180 ° to form a plurality of closed spaces 24.
Are formed.

An oil pump 51 driven by the rotary shaft 5 is installed at the rear end of the rotary shaft 5, and the tip of a suction pipe 56 of the oil pump 51 is immersed in the lubricating oil 57 stored in the bottom of the closed housing 8. The discharge port of the oil pump 51 communicates with the oil supply hole 52 formed in the rotary shaft 5.

By driving the electric motor M, the rotary shaft 5, the eccentric pin 53, the drive bush 54, and the boss 23.
The orbiting scroll 2 is driven through a revolving orbiting mechanism composed of the like, and the orbiting scroll 2 revolves on a circular orbit having a revolution revolving radius while being prevented from rotating by a rotation inhibiting mechanism 3.

Then, the gas enters the closed housing 8 through the suction pipe 82, passes through the passage 85 and the suction passage 15, and the suction chamber 43
Is inhaled into the closed space 24 via. Then, as the volume of the enclosed space 24 decreases due to the orbiting movement of the orbiting scroll 2, the compressed space reaches the central portion while being compressed, and the discharge port
The check valve 17 is pushed open from 13 to enter the discharge chamber 42, from which it is discharged to the outside via the discharge pipe 83.

At the same time, the oil pump 51 is driven by the rotary shaft 5 and sucks the lubricating oil 57 stored in the inner bottom of the closed housing 8 through the oil suction pipe 56. Lubricating oil discharged from the oil pump 51 is supplied to the rear bearing 72 and the front bearing 71 through the oil supply hole 52 to lubricate them and to lubricate the eccentric pin 53, the drive bush 54, the slewing bearing 73, etc. It returns to the bottom of the closed housing 8 through the oil drain hole 62.

[0011]

In the above-mentioned conventional horizontal hermetic electric compressor, when the liquid level of the lubricating oil 57 sealed in the bottom of the hermetic housing 8 rises above the lower end of the rotor Ma, the rotor Ma is Not only is power wasted to scoop up the lubricating oil, but also the scattered splashes of lubricating oil are sucked into the enclosed space 24 along with the gas, so the amount of oil rise (discharged with the discharged gas is discharged. There is a problem such as increase in the amount of lubricating oil). In order to avoid the above-mentioned problem, if the amount of lubricating oil enclosed is reduced, when the liquid level of the lubricating oil 57 stored in the bottom of the closed housing 8 decreases, the lubrication failure of the sliding part or abnormal wear or burning due to this may occur. There was a risk that it would be accompanied.

[0012]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above problems, and the gist of the invention is that a compressor groove and an electric motor built in a hermetically sealed housing are substantially provided. In the horizontal hermetic electric compressor, which is interlockingly connected through a horizontally extending rotary shaft, and the lubricating oil stored in the inner housing bottom is supplied to the compressor groove and the sliding part of the rotary shaft, In a horizontal hermetic electric compressor, an inner diameter center of a stator of a motor is eccentric upward with respect to an outer diameter center thereof. A hole or notch through which lubricating oil can flow can be formed in the lower portion of the stator of the electric motor.

[0013]

In the present invention, since the above structure is provided, the space below the rotor of the electric motor becomes large, so that a large amount of lubricating oil can be stored in that space. If a hole or a notch through which lubricating oil can flow is formed in the lower portion of the stator of the electric motor, a large amount of lubricating oil can be stored in the bottom of the closed housing.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIGS. As shown in FIGS. 1 and 2, the center O ₁ of the inner diameter D ₁ of the stator Mb of the electric motor M is the center O ₁ of the outer diameter D ₂ .
_It is eccentric by a distance δ above ₂ , and accordingly, the compression mechanism C, the rotary shaft 5 and the like are also biased upward by a distance δ with respect to the closed housing 8. Other configurations are shown in FIG.
6 is similar to the conventional one shown in FIG. 6, and corresponding members are designated by the same reference numerals. Then, the electric motor M
Since the space under the rotor Ma of is large, a large amount of lubricating oil can be stored in this space.

As shown in FIG. 3, if a large number of holes 30 are provided in the lower portion of the stator Mb, or as shown in FIG. 4, a notch 31 is provided in the lower portion of the stator Mb, these large holes 30 or notches. Lubricating oil can be stored in 31 as well, so that the amount of lubricating oil that can be stored in the space under the rotor Ma of the electric motor M can be further increased.

By eccentricity of the inner diameter center O ₁ of the stator Mb upward with respect to the outer diameter center O ₂ , the axial symmetry of the magnetic circuit is broken, but the magnetic circuit above the stator Mb is not saturated, and If the gap between the stator Mb and the rotor Ma is kept within an appropriate range, the torque fluctuation of the electric motor M is not proportional to the eccentricity, so that it can be sufficiently put to practical use.

[0017]

According to the present invention, since the center of the inner diameter of the stator of the electric motor is eccentric with respect to the center of the outer diameter thereof, the space below the rotor of the electric motor can be increased, and therefore the rotation of the rotor can be increased. A large amount of lubricating oil can be stored in the bottom portion of the closed housing within a range where it cannot be scraped up by. As a result, even if the amount of lubricating oil stored in the bottom of the closed housing decreases due to an increase in the amount of oil rise, poor lubrication of the sliding parts of the conventional compression mechanism and rotary shaft, and abnormal wear due to this And prevent seizure. If a hole or a notch through which lubricating oil can flow is formed in the lower portion of the stator of the electric motor, a large amount of lubricating oil can be stored in the bottom portion of the closed housing.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a transverse sectional view corresponding to FIG. 2 showing a second embodiment of the present invention.

FIG. 4 is a transverse sectional view corresponding to FIG. 2 showing a third embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a conventional horizontal hermetic electric compressor.

6 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

8 Closed housing C Compression mechanism M Electric motor Ma Rotor Mb Stator 5 Rotation shaft 57 Lubricating oil O ₁ Inner diameter center O ₂ Outer diameter center δ Eccentricity

Claims (2)

[Claims] 1. A compressor groove incorporated in a hermetically sealed housing and an electric motor are interlockingly connected via a rotary shaft that extends substantially horizontally, and the lubricating oil stored in the inner bottom portion of the hermetically sealed housing is connected to the compressor. In a horizontal hermetic electric compressor for supplying oil to a groove and a sliding portion of a rotary shaft, a horizontal hermetic electric compressor characterized in that an inner diameter center of a stator of the electric motor is eccentric upward with respect to an outer diameter center thereof. Machine. 2. The horizontal hermetic electric compressor according to claim 1, wherein a hole or a notch through which lubricating oil can flow is formed in a lower portion of a stator of the electric motor.