JP3105672B2 - Horizontal hermetic electric compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a scroll type compression mechanism,
The present invention relates to a horizontal hermetic electric compressor incorporating a screw-type compression mechanism and the like.

[0002]

2. Description of the Related Art One example of a conventional horizontal hermetic electric compressor is shown in FIG.
Is shown in The interior of the hermetically sealed 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 provided in front of the low-pressure side 45, and an electric motor M is provided behind the scroll-type compression mechanism C. These are connected to each other via a rotating shaft 5 extending substantially horizontally.

An electric motor M is composed of a rotor Ma and a stator Mb.
And 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 permits the orbiting movement of the fixed scroll 1, the orbiting scroll 2, and the orbiting scroll 2, but the rotation preventing mechanism 3, such as an Oldham link, for stopping the rotation, and the fixed scroll 1 are fastened. The frame 6 includes a front bearing 71 and a rear bearing 72 that support the rotating shaft 5.

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

The orbiting scroll 2 includes an end plate 21 and a spiral wrap 22 provided on the inner surface of the end plate 21. A drive bush 54 is provided with a drive bush 54 in a boss 23 provided on the outer surface of the end plate 21.
It is rotatably fitted via 73.

A hole 55 formed in the drive bush 54
An eccentric pin 53 projecting from the end of the rotary shaft 5 is rotatably fitted therein.

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

An oil pump 51 is linked to the rear end of the rotary shaft 5. The suction port 56 of the oil pump 51 is immersed in lubricating oil 58 stored in the bottom of the sealed housing 8, and the discharge port (not shown) of the oil pump 51 is connected to an oil supply hole 52 formed in the rotary shaft 5. Communicating.

When the electric motor M is driven, the orbiting scroll 2 is driven via a revolving orbiting mechanism including the rotary shaft 5, the eccentric pin 53, the drive bush 54, the boss 23, and the like.
The orbiting scroll 2 revolves in a circular orbit having a revolving radius of revolution while being prevented from rotating by the automatic blocking mechanism 3.

Then, the gas enters the low pressure side 45 via the suction pipe 82, and this gas is sucked into the closed space 24 via the passage 61 and the low pressure chamber 43. Then, as the volume of the closed space 24 decreases due to the revolving orbiting motion of the orbiting scroll 2, the compressed space reaches the central portion while being compressed, pushes the check valve 17 from the discharge port 13 and opens the high pressure chamber 42 to the high pressure side 44. Enter and discharge pipe from here
It is discharged to the outside via 83.

At the same time, the lubricating oil 58 stored in the inner bottom of the sealed housing 8 is supplied to the suction port 56 by the oil pump 51.
It is further sucked up and supplied to sliding parts such as a rear bearing 72, a front bearing 71, an eccentric pin 53, and a slewing bearing 73 through an oil supply hole 52, and after lubricating these, passes through an oil drain passage 62 to form a sealed housing. 8 Return to the bottom.

[0013]

In the conventional horizontal hermetic electric compressor described above, when a sufficient amount of lubricating oil is sealed in the hermetically sealed housing 8, the oil level of the lubricating oil 58 rises, and the rotor Ma becomes lubricated. Not only wastes power but also lubricating oil droplets are sucked into the sealed space 24 accompanying the gas sucked into the sealed housing 8, so that the amount of oil rising (lubrication contained in the discharge gas) (Refers to the amount of oil).

If the amount of lubricating oil is reduced to avoid the above problem, the sliding portion of the compression mechanism C may have poor lubrication due to fluctuations in the amount of lubricating oil in the closed housing 8.

[0015]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its gist is that a compression mechanism and a compression mechanism are substantially provided in a horizontally disposed hermetic housing. An electric motor connected via a horizontally extending rotary shaft is built in, and the lubricating oil stored in the bottom of the sealed housing is pumped up by an oil pump, and the lubricating oil is compressed through an oil supply hole formed in the rotary shaft. In a horizontal hermetic electric compressor that supplies oil to a sliding portion of a mechanism, a small-capacity first oil reservoir for storing lubricating oil discharged from the oil pump and an overflow port of the first oil reservoir. A large-capacity second oil reservoir for storing the flowing lubricating oil is disposed inside the closed housing, and the first oil reservoir is communicated with the oil supply hole, and the first oil reservoir is provided. Spill port is located higher than the oil supply hole In both cases, the overflow port of the second oil sump is set higher than the overflow port of the first oil sump, and the suction port of the oil pump is set to the upper limit of the lubricating oil stored in the bottom of the closed housing. A horizontal hermetic electric compressor characterized by being opened below the oil level.

[0016]

According to the present invention, the lubricating oil stored in the bottom of the sealed housing is pumped up by the oil pump into the first oil sump when the compressor is started. The oil is supplied to the sliding portion of the compression mechanism via the oil supply hole by the head difference between the oil level in the oil reservoir and the oil supply hole.

When the oil level in the first oil sump rises, the lubricating oil overflows from the overflow port of the first oil sump and enters the second oil sump. If the oil level in the vessel rises above the overflow port of the first oil sump, the lubricating oil is supplied to the sliding portion of the compression mechanism by the head difference between the oil level and the oil supply hole.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIG. A large-capacity second oil sump 96 is disposed at the rear of the horizontally sealed housing 8, and a small-capacity first oil sump 91 is installed in the second oil sump 96. I have.

The capacity V of the second oil reservoir 96 is such that when the initial amount of lubricating oil filled in the closed housing 8 is VO and the storage amount at the upper limit oil level H1 is V1, V ≧ VO −V1 is determined.

A discharge port of an oil pump 51 is provided in the first oil sump 91.
57 and the oil supply hole 52 are opened, and the overflow port 93 of the first oil reservoir 91 is located above the oil supply hole 52.

The lubricating oil that overflows from the overflow port 93 of the first oil reservoir 91 is stored in the second oil reservoir 96, and the second oil reservoir 96
Is located above the overflow port 93 of the first oil sump 91.

The suction port 56 of the oil pump 51 is positioned so as to open below the upper limit oil level H1, which is an allowable limit for preventing the rotor Ma from immersing in the lubricating oil 58.

When lubricating oil is not sufficiently stored in the first and second oil reservoirs 91 and 96, such as when the compressor is started, when the compressor is started, the sealed housing is closed. The lubricating oil 58 stored in the inner bottom of the pump 8 is pumped up by an oil pump 51 through a suction port 56,
Enters the oil sump 91. When the oil level in the first oil sump 91 rises, the lubricating oil passes through the oil supply hole 52 due to a head difference between the oil level and the oil supply hole 52, and the rear bearing 72 and the front bearing 71 of the compression mechanism C. The lubricating oil is supplied to sliding parts such as the eccentric pin 53 and the swivel bearing 73, and after lubricating these, falls from the oil drain passage 62 and returns to the inner bottom of the sealed housing 8.

When the oil level in the first oil sump 91 rises, the lubricating oil overflows from the overflow port 93 and enters the second oil sump 96, and the oil level in the second oil sump 96 is increased. Rises above the overflow port 93, the lubricating oil is supplied to the sliding portion by the head difference between the oil level in the second oil reservoir 96 and the oil supply hole 52. Second sump 96
When the oil level exceeds the overflow 97, the lubricating oil
After falling through 97, it falls to the inner bottom of the sealed housing 8.

Thus, during steady operation, since the lubricating oil is stored in the first and second oil reservoirs 91 and 96, the amount of the lubricating oil 58 at the bottom of the closed housing 8 is reduced, and the upper limit is always maintained. Since the oil level H1 can be maintained, the situation where the rotor Ma of the electric motor M is immersed in the lubricating oil 58 can be avoided.

When the compressor is started, lubricating oil is pumped into the first oil reservoir 91 and the volume is set to a small value, so that the oil level can be raised quickly, so that the sliding portion It can be refueled quickly.

[0027]

According to the present invention, the first and second lubricating oils are used.
, The amount of lubricating oil at the bottom of the sealed housing can be reduced, and the oil level can always be maintained at or below the upper limit oil level. It is possible to avoid a situation of being immersed in the inside, to prevent waste of power, and to reduce the amount of oil rise.

Further, when the compressor is started, the lubricating oil is pumped to the first oil reservoir and the volume is set to a small value. Therefore, the oil level rises quickly, and the sliding portion is quickly supplied with oil. be able to.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view showing a conventional horizontal hermetic electric compressor.

[Explanation of symbols]

 8 Closed housing C Compression mechanism 5 Rotary shaft M Electric motor 52 Oil supply hole 51 Oil pump 56 Suction port 57 Discharge port 91 First oil sump 93 Overflow port 96 Second oil sump 97 Overflow port

Claims (1)

(57) [Claims] 1. A compression mechanism and an electric motor connected to the compression mechanism via a rotating shaft extending substantially horizontally are built in a horizontally disposed hermetically sealed housing, and lubricating oil stored in a bottom portion of the hermetically sealed housing is contained therein. In a horizontal hermetic electric compressor, which is pumped by an oil pump and supplies oil to a sliding portion of the compression mechanism via an oil supply hole formed in the rotary shaft,
A small-capacity first oil reservoir for storing lubricating oil discharged from the oil pump, and a large-capacity second oil reservoir for storing lubricating oil overflowing from an overflow port of the first oil reservoir; Vessels are disposed inside the closed housing, the first oil sump communicates with the oil supply hole, and the overflow port of the first oil sump is provided at a higher position than the oil supply hole, and The overflow port of the oil sump 2 is set higher than the overflow port of the first oil sump, and the suction port of the oil pump is set at the upper limit oil level of the lubricating oil stored in the bottom of the sealed housing. A horizontal hermetic electric compressor characterized by being opened below.