JPH0681794A - Horizontal sealed compressor - Google Patents

Abstract

PURPOSE:To dissolve the trouble that lube oil can not be returned rearward because of being obstructed by the stator of an electric motor by discharging the excessive lube oil supplied to the slidable part of a compression mechanism to the rear side of the electric motor through an oil discharge hole drilled on a rotary shaft. CONSTITUTION:As for a compressor, a compression mechanism C arranged on the front side of a sealed housing 8 is driven through a rotary shaft 5a by an electric motor M arranged on the rear side. The lube oil stored on the bottom part in the sealed housing is sucked by an oil pump 51 arranged on the rear side of an electric motor M, and supplied to a slidable part of the compression mechanism C through an oil feeding hole 52 drilled on the rotary shaft 5a. In this case, also an oil discharge hole 58 is drilled on the rotary shaft 5a. The excessive lube oil supplied to the slidable part is discharged to the rear side of the electric motor M through an oil discharge hole 58. Accordingly, the trouble that the lube oil can not be returned smoothly rearward from a passage 85 formed on the stator Mb of the electric motor M is dissolved.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional scroll type compressor installed horizontally.

The interior of the closed housing 8 is partitioned by a discharge cover 31 into a high pressure side 44 and a low pressure side 45. Inside the low-pressure side 45, a scroll-type compression mechanism C is arranged in front of the low-pressure side 45, and an electric motor M is arranged in the rear thereof, which are interlockingly connected to each other via a rotary shaft 5. The electric motor M is composed of a rotor Ma and a stator Mb. The rotor Ma is fixed to the rotating shaft 5, and the stator Mb is fixed by being press-fitted into the hermetically sealed housing 8.

The scroll type compression mechanism C allows the revolution movement of the fixed scroll 1, the orbiting scroll 2, and the orbiting scroll 2, but the rotation inhibiting mechanism 3 such as an Oldham link for preventing its rotation, the fixed scroll 1 and the electric motor M.
A frame 6 to which is fastened, a front bearing 71 and a rear bearing 72 that pivotally support the rotary shaft 5, and the like.

The fixed scroll 1 comprises an end plate 11 and a spiral wrap 12 provided upright on the inner surface thereof.
A discharge port 13 is provided in the central portion of the.

The orbiting scroll 2 comprises an end plate 21 and a spiral wrap 22 provided upright on the inner surface of the end plate 21.
Drive bush 54 inside the boss 23 that is erected on the outer surface of the
Is rotatably fitted through a swivel bearing 73, and an eccentric pin 53 protruding from an end of the rotary shaft 5 is rotatably fitted in a hole 55 formed in the drive bush 54.

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 engaging them with each other while shifting the angle by 180 degrees.

An oil pump 51 is installed at the end of the rotary shaft 5. The suction port 56 of the oil pump 51 is opened below the closed housing 8 and the discharge port 57 is bored in the rotary shaft 5. It communicates with the oil supply hole 52.

By driving the electric motor M, the orbiting scroll 2 is driven through a revolving orbiting mechanism including a rotating shaft 5, an eccentric pin 53, a drive bush 54, a boss 23, etc., and the orbiting scroll 2 is rotated by a rotation preventing mechanism 3. While being prevented from rotating, it makes an orbiting motion on a circular orbit with an orbiting radius.

Then, the gas passes through the suction pipe 82 and the low pressure side 4
5, the gas passes through the passage 63, passes through the low pressure chamber 43, and is then sucked into the closed space 24. Then, as the volume of the closed 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 check valve 17 is pushed open from the discharge port 13 into the high pressure chamber 42, and further. From there, enter the high pressure side 44, and from here, discharge pipe 8
It is discharged to the outside after passing through 3.

At the same time, the lubricating oil stored in the lower portion of the closed housing 8 is sucked up by the oil pump 51 from the suction port 56, passes through the discharge port 57 and the oil supply hole 52, and the rear bearing 72, the front bearing 71, Eccentric pin 53, slewing bearing 73
It is supplied to the sliding parts such as to lubricate them. Eccentric pin 5
3, the excess lubricating oil that lubricated the slewing bearing 73 is the frame 6
It enters the chamber 61 formed at the center of the front end of the above, falls from the oil drain passage 62, and is stored in the lower part of the closed housing 8. In addition,
The movement of the lubricating oil to the rear (right side in the figure) of the electric motor M is performed via a passage 85 provided at the lower end of the stator Mb.

[0012]

The above-mentioned conventional horizontal hermetic compressor has the following problems to be solved.

That is, in the conventional horizontal hermetic compressor,
A partially cutout passage 85 is formed in the stator Mb press-fitted into the inner peripheral surface of the hermetic housing 8, and the lubricating oil dropped from the oil discharge passage 62 passes through this passage 85 and is located on the rear side of the stator Mb. It is designed to return to (right side of the figure).

However, if the passage 85 is formed to be large, the efficiency of the electric motor M is reduced, so that the passage 85 can be minimized. As a result, the lubricating oil that has dropped from the oil discharge passage 62 into the closed housing 8 becomes difficult to return to the suction port 56 of the oil pump 51,
On the rear side of the stator Mb, the oil level lowers and the suction amount of the oil pump 51 decreases, which leads to poor lubrication of the sliding portion. On the front side of the stator Mb, the oil level rises and the lubricating oil is sealed. Since the gas sucked into the closed space 24 from the housing 8 easily accompanies, there is a problem that the amount of oil rise (which means the amount of lubricating oil contained in the discharge gas) increases.

In order to solve the above problems, the present invention has an object to provide a horizontal hermetic compressor in which an oil discharge hole is vertically provided (drilled) in a rotary shaft so that lubricating oil returns to the rear side of the stator Mb. To do.

[0016]

As a means for solving the above-mentioned problems, the present invention provides a compression mechanism provided on the front side in a hermetically sealed housing and a relatively rearward drive mechanism so that the compression mechanism can be driven via a substantially horizontal rotary shaft. And an oil pump provided on the rear side of the electric motor and sucking the lubricating oil accumulated at the bottom in the closed housing from the rear by the oil pump and piercing the rotary shaft. In a horizontal hermetic compressor that supplies oil to the sliding part of the compression mechanism located on the front side of the electric motor through the oil supply hole, the excess lubricating oil supplied to the sliding part can be discharged to the rear side of the electric motor. Another object of the present invention is to provide a horizontal hermetic compressor characterized by comprising an oil drain hole formed in the rotary shaft.

[0017]

Since the present invention is constructed as described above, it has the following actions.

That is, the surplus oil supplied from the bottom by the oil pump on the rear side to the compression mechanism on the front side in the closed housing and supplied through the oil supply hole formed in the rotary shaft can be discharged to the rear side. Since the rotary shaft is further provided with the oil drain hole, the excess lubricating oil is easily returned to the rear side, and the problem caused by the conventional lubricating oil not being smoothly returned to the rear by being blocked by the stator Mb is solved. To do.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. The same components as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted unless necessary.

FIG. 1 is a longitudinal sectional view of the present embodiment. In the figure, a scroll type compression mechanism C provided on the front side (left side in the figure) inside a hermetically sealed housing 8 and the scroll type compression mechanism C are shown in FIG. The horizontal hermetic compressor of this embodiment is configured by the electric motor M provided relatively rearward so as to be drivable via the substantially horizontal rotary shaft 5a and the oil pump 51 provided on the rear side of the electric motor M. Has been done. That is, the configuration other than the rotary shaft 5a is the same as the conventional example. However, the oil drain passage 62 is not provided because it is unnecessary.

On the rotary shaft 5a, the sliding portion of the scroll type compression mechanism C, and the surplus lubricating oil or the like of the lubricating oil supplied by the oil pump 51 is discharged to the rear side (right side in the figure) of the electric motor M. An oil drain hole 58 is bored in the longitudinal direction so as to be possible. Other configurations are similar to those of the conventional rotary shaft 5. That is, in addition to the oil drain hole 58, the oil supply hole 52 is also formed in parallel with the rotary shaft 5a. The oil drain hole 58 is provided so as to be biased toward the center of the rotary shaft 5a with respect to the oil feed hole 52, one end of which opens into a chamber 61 formed at the center of the front end of the frame 6, and the other end of which is the electric motor M, Specifically, it is opened in the closed housing 8 on the rear side of the stator Mb.

Incidentally, the conventional oil drain passage 62 is not provided in the frame 6 in this embodiment.

Next, the operation of the above configuration will be described.

The lubricating oil sucked up from the suction port 56 by the oil pump 51 passes through the oil supply hole 52, and the sliding portion of the scroll type compression mechanism C, that is, the front bearing 71, the eccentric pin 53,
It is supplied to the slewing bearing 73 and the like to lubricate them. Then, the excess lubricating oil that lubricates the sliding portion enters the chamber 61.

Since the pressure generated by the rotation of the rotary shaft 5a is lower in the oil drain hole 58 provided closer to the center of the rotary shaft 5a than the oil supply hole 52, the lubrication in the chamber 61 is performed. The oil passes through the oil drain hole 58 and the stator Mb
Returning to the inside of the closed housing 8 on the rear side of.

As described above, according to the present embodiment, the surplus lubricating oil supplied to the sliding portion of the scroll type compression mechanism C passes through the oil drain hole 58 to the rear side of the stator Mb in which the oil pump 51 is installed. Since the oil level is returned to the closed housing 8, the oil level can always be maintained at a sufficiently high level, the oil supply to the sliding portion will not run out, and the oil level on the front side of the stator Mb will be prevented from rising. There is an advantage that you can.

Further, since the lubricating oil returns smoothly to the rear of the stator Mb, there is an advantage that the problem of oil rising caused by the accumulation of lubricating oil on the front side of the stator Mb and the high oil level is eliminated. is there.

[0028]

Since the present invention is constructed as described above, it has the following effects.

That is, according to the present invention, the surplus lubricating oil supplied to the sliding portion of the compression mechanism through the oil supply hole by the oil pump is passed through the oil discharge hole formed in the rotary shaft to the rear side of the electric motor. Since it can be returned to the closed housing, the amount of oil at the suction port of the oil pump is secured, lubrication failure of the sliding part can be prevented, and rise of the oil level on the front side of the electric motor can be avoided. As a result, the amount of oil rise can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a horizontal hermetic compressor according to an embodiment of the present invention,

FIG. 2 is a vertical cross-sectional view of a conventional horizontal hermetic compressor.

[Explanation of symbols]

 5a rotating shaft 8 hermetic housing 51 oil pump 52 oil supply hole 56 intake port 57 discharge port 58 oil discharge hole 53 eccentric pin 61 chamber 72 rear bearing 73 swivel bearing C scroll type compression mechanism M electric motor Ma rotor Mb stator

Claims (1)

[Claims] 1. A compression mechanism provided on the front side in a hermetic housing, and an electric motor provided on the relatively rear side so that the compression mechanism can be driven via a substantially horizontal rotating shaft,
The electric motor comprises an oil pump provided on the rear side of the electric motor, and the oil pump sucks the lubricating oil accumulated at the bottom of the closed housing from the rear side through the oil supply hole formed on the rotary shaft to the front side of the electric motor. In the horizontal hermetic compressor that supplies oil to the sliding portion of the compression mechanism located on the side, the excess lubricating oil supplied to the sliding portion is bored in the rotary shaft so as to be discharged to the rear side of the electric motor. A horizontal hermetic compressor characterized by comprising an oil drain hole.