JPH062684A - Horizontal type closed motor-driven compressor - Google Patents

Abstract

PURPOSE:To restrain an increase of lubricating oil quantity (oil rising quantity) delivered together with delivery gas by providing a communicating passage to communicate the tail end of an oil discharge passage to return lubricating oil to an oil reservoir after lubricating a lubricating place of a compression mechanism with an oil suction pipe or the oil reservoir. 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 in an oil reservoir 57 is sucked in 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 by means of an oil discharge passage 62 after respective bearings 71-73 and so on are lubricated through an oil feed hole 52. In this case, the tail end of the oil discharge passage 62 is communicated with/connected to the oil suction pipe 56 through a communicating pipe 30. Lubricating oil after lubrication is introduced to the oil suction pipe 56 through the oil discharge passage 62 and the communicating pipe 30, and is flowed together with the lubricating oil being sucked up from the oil reservoir 57, and is sucked in the oil pump 51.

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 FIG. 4 shows a conventional horizontal type hermetic electric compressor.
An example is shown. 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 is a rotor Ma and a stator
Consisting of Mb, the rotor Ma is fixed to the rotating shaft 5,
The stator Mb is fixed to the closed 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 an oil absorption pipe 56 of the oil pump 51 is lubricated in an oil sump 57 formed at the bottom of the closed housing 8. It is immersed in oil, and the discharge port of the oil pump 51 communicates with an 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 the lubricating oil stored in the oil sump 57 is sucked up through the oil suction pipe 56. The lubricating oil discharged from the oil pump 51 passes through the oil supply hole 52 and the rear bearing 72 and the front bearing.
71 is lubricated to lubricate them and eccentric pin 53,
After lubricating the drive bush 54, the slewing bearing 73, etc., they return to the oil sump 57 through the oil drain passage 62.

[0011]

In the above-mentioned conventional horizontal type hermetic electric compressor, the eccentric pin 53 and the drive bush are used.
When the lubricating oil after lubricating 54, the slewing bearing 73, etc. falls from the oil drain passage 62 to the oil sump 57, the closed housing 8
Since it is sucked into the closed space 24 of the compression mechanism C along with the flow of gas inside, the amount of oil rise (which means the amount of lubricating oil contained in the discharge gas and discharged together with it) increases. If the liquid level of the lubricating oil stored in the oil sump 57 falls below the lower end of the oil suction pipe 56 due to this increase in the amount of oil rise, there is a possibility that refueling may become impossible and a serious accident such as seizure may occur. It was

[0012]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above problems, and its gist is to provide a compression mechanism for sucking and compressing gas from the inside of a hermetically sealed housing. And an electric motor are incorporated, and the compression mechanism is connected to one end of a rotating shaft that extends substantially horizontally of the electric motor, and the other end of the electric motor absorbs lubricating oil in an oil reservoir formed at the bottom of the hermetic housing. In a laterally mounted hermetic electric compressor that is connected to an oil pump that sucks in through a pipe, the end of the drain passage for returning the lubricating oil after lubricating the required lubrication points of the compression mechanism into the oil sump is The horizontal electric hermetic compressor is characterized in that a communication passage communicating with the oil absorption pipe or the oil sump is provided.

[0013]

Since the present invention has the above-mentioned structure, the lubricating oil after lubricating the required lubrication points of the compression mechanism does not come into contact with the gas flow in the hermetically sealed housing through the drain passage and the communication passage. Return to oil absorption pipe or oil sump.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIG. 1, where (A) is a vertical sectional view and (B) is a partial vertical sectional view taken along a plane obtained by slightly rotating (A). The end of the oil drain passage 62 is connected to the oil suction pipe 56 via the communication pipe 30. Then, the lubricating oil that lubricates the eccentric pin 53, the drive bush 54, the slewing bearing 73, and the like enters the oil absorbing pipe 56 through the drain passage 62 and the communication pipe 30, and joins with the lubricating oil sucked up from the oil sump 57. Is sucked into the oil pump 51. Then, after being urged by the oil pump 51, oil is supplied to the required lubrication points of the compression mechanism C and the rotary shaft 5 through the oil supply hole 52.

As shown in FIGS. 2A and 2B, an oil passage 31 formed by welding a gutter 32 to the outer surface of the hermetically sealed housing 8 may be provided in the middle of the communication pipe 30.

As shown in FIG. 3, the lower portion of the electric motor M is made eccentric to thicken the stator Mb.
It can also be opened at 57.

[0017]

According to the present invention, the lubricating oil after lubricating the required lubrication points of the compression mechanism passes through the drain passage and the communication passage to the oil absorption pipe or the oil reservoir without touching the gas flow in the closed housing. Since it returns, it is possible to suppress an increase in the amount of oil rise, and therefore it is possible to prevent poor lubrication due to a decrease in the liquid level of the lubricating oil stored in the oil sump, and abnormal wear and seizure due to this.

[Brief description of drawings]

1 shows an embodiment of the present invention, (A) is a longitudinal sectional view,
(B) is a partial vertical cross-sectional view taken along a plane obtained by slightly rotating (A).

FIG. 2 shows a second embodiment of the present invention, where (A) is shown in FIG. 1 (B).
2B is a partial vertical sectional view corresponding to FIG. 3B, and FIG. 3B is a partial sectional view taken along the line BB of FIG.

FIG. 3 is a vertical sectional view showing a third embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view of a conventional horizontal hermetic electric compressor.

[Explanation of symbols]

 8 Airtight Housing C Compression Mechanism M Electric Motor 5 Rotation Shaft 57 Oil Reservoir 51 Oil Pump 56 Oil Absorption Pipes 53, 54, 74 Required Lubrication Point 62 Drain Oil Passage 30 Communication Passage

Claims (1)

[Claims] 1. A compression mechanism for sucking and compressing gas from the inside of the hermetic housing and an electric motor are built-in, and the compression mechanism is connected to one end of a rotary shaft extending substantially horizontally of the electric motor. At the other end, in a horizontal electric hermetic compressor that is connected to an oil pump that sucks the lubricating oil in the oil reservoir formed in the bottom of the hermetic housing through an oil absorption pipe, A horizontal hermetic electric compressor, characterized in that a communication passage for connecting the end of an oil discharge passage for returning the lubricated oil after lubrication into the oil sump to the oil suction pipe or the oil sump is provided.