JPS6267295A - Closed type scroll compressor - Google Patents

Abstract

PURPOSE:To achieve sufficient separation of oil in a refrigerant gas and to reduce the rising quantity of oil by providing an oil reservoir separated from a refrigerant passage around the outer circumferential part of a compression mechanism, and an oil passage through which said oil reservoir is communicated with the lower part of the compression mechanism so as to securely isolate refrigerant gas from oil. CONSTITUTION:During operation, after compressed in the space between a fixed scroll 5 and a revolving scroll 6, refrigerant gas taken in through a suction pipe 19 is blown out from a discharge port 14 of the fixed scroll 5 toward the upper wall of a closed vessel 1. And most part of oil contained in the refrigerant gas is separated by the velocity change due to collision at the upper wall. The separated oil, while running along the upper wall of the vessel 1, flows toward the outer circumferential part of the fixed scroll 5, and then through an oil passage 18 flows down to an oil reservoir 4 after passing through an oil passage 21 between the side wall of the vessel 1 and the outer circumferential part of an electric motor 3. On the other hand, the refrigerant gas lessened in oil content flows to the lower part of a compression mechanism 2 through a refrigerant passage 16. Thus, refrigerant gas and oil is introduced to the lower part of the compression mechanism 2 via separate passages, and sufficient separation of oil and reduction in the rising quantity of oil can be enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a closed type scroll press II11 machine, and particularly to prevention of oil spillage.

[Background of the invention]

In a hermetic scroll compressor, a compression mechanism that combines a fixed scroll with a spiral wrap and an orbiting scroll is placed above a hermetically sealed container, and the electric motor driving the compression mechanism is hermetically sealed via a crankshaft. A lubricating oil reservoir is formed at the bottom of the sealed container to supply oil to the swing bearing and the main bearing, and the refrigerant gas compressed by the compression mechanism is sent from the discharge port of the fixed scroll to the sealed container. There is a structure in which the refrigerant is discharged into the upper space of the refrigerant, and then flows downward to the electric motor side through a refrigerant passage between the compression mechanism and the closed container.

This type of conventional hermetic scroll compressor was developed in a patent application filed in 1983.
As described in No. 81170, the refrigerant passage is provided near the upper coil end of the motor, and the oil contained in the refrigerant gas is separated from the speed change when the refrigerant gas collides with the upper end of the motor and from the outer circumference of the motor. This is done by reducing the speed of the oil as it flows between the chambers below the electric motor, that is, the oil is separated below the compression mechanism.

1. In the hermetic scroll compressor described above,
When the amount of oil contained in the refrigerant gas is large, tM, #Jh
Separated oil accumulates in the motor part, and this oil V (refrigerant gas collides with the oil in the refrigerant gas, so the oil in the refrigerant gas is not separated sufficiently, and the oil in the motor F part is blown out). , there was a problem that there was a lot of oil coming out.

[Purpose of the invention]

An object of the present invention is to provide a hermetic scroll compressor that can sufficiently separate oil contained in refrigerant gas and reduce the amount of oil coming up.

(Summary of the Invention) The present invention provides an oil reservoir that is separated by a refrigerant passage on the outer periphery of the compression mechanism, and an oil passage that communicates the core oil reservoir with the lower part of the compression mechanism. Separation of the oil is carried out in the upper space of the sealed container, and the separated oil is temporarily stored in the oil reservoir, and the kernel oil and refrigerant gas are flowed down the compression mechanism through separate passages. This allows sufficient separation and reduces oil build-up.

[From -〇Example]

An embodiment of the present invention will be explained with reference to FIGS. 1 and 2 after one trial. Fig. 1j shows a longitudinal sectional view of a hermetic J-less scroll compressor according to the present invention, and Fig. 2f shows a sectional view taken along the line A-A in Fig. 1. In the figure, a compressor mechanism 2 and a compressor 3 are disposed above an airtight container i, and a lubricating oil reservoir 4 is provided at the bottom of the airtight container 1.
is formed. The front QQ compression mechanism 2 has an identification block 5 having two spiral-shaped bumps 5a on the base plate.
It also includes an orbiting scroll 6 having a spiral wrap 6a on a base plate, and a frame 7 that is integrated with the fixed scroll 5 and supports the orbiting scroll 6, and the wraps of the city scroll 5 and the orbiting scroll 6 are engaged with each other. The structure is as follows. Further, an Oldham machine #148 is provided between the orbiting scroll 6 and the Freno 7 to prevent rotation of the orbiting scroll 6.

The electric motor 3 is connected to an orbiting scroll 6 via a crankshaft 9.
It is designed to make a turning movement. Crank $119
The main bearing 10 provided in the frame 7 and the orbiting scroll 6
It is supported by a swing bearing 11 provided on the back surface of the holder. Further, an oil supply passage 12 is provided in the crankshaft 9 to guide lubricating oil to the main bearing 10 and the swing bearing 11, and the oil supply passage 12 is provided at the shaft end of the electric motor 3 to suck up lubricant oil from the oil reservoir 4.
A refueling device 13 for supplying oil to the tank is provided.

In the compression mechanism 2, the orbiting scroll 6 is connected to the crankshaft 9.
, the space (compression chamber) formed by the orbiting scroll 6 and the fixed scroll 5 decreases in volume as it moves toward the center of the scroll, compressing the refrigerant gas sucked in and fixing the compressed gas. The liquid is discharged from a discharge port 14 provided at the center of the scroll 5 into an upper space 15 inside the closed container 1 . Furthermore, a cold tMA passage 16 is provided between the outer circumferential portion of the fixed scroll 5 and the frame 7 and the side wall of the closed container 1 to allow the refrigerant gas in the above-mentioned nozzle space 15 to flow downward from one end of the compression mechanism 2 to the other. It is being In addition, i: is attached to the outer circumference of the fixed scroll 5 in the refrigerant passage 16.
A plurality of oil reservoirs 17 (three in the illustration) are provided, and an oil passage 18 is provided on the outer circumferential surface of the frame 7 to guide the oil accumulated in the oil reservoirs 17 below the compression mechanism 2. There is. In the figure, reference numeral 19 denotes a suction pipe that passes through the closed container 1 and connects to the suction chamber of the compression mechanism 2, and a discharge pipe that protrudes between the compression mechanism 2 and the electric motor 3 in the closed container 1.

Next, the operation of this embodiment will be explained.

Electric motor 3 drive! When the orbiting scroll 6 rotates via the crankshaft 9 due to ktI, the refrigerant gas sucked in from the suction pipe 19 is compressed in the space between the fixed scroll 5 and the orbiting scroll 6, and then flows through the discharge port 14 of the fixed scroll 5.
It is discharged into the −F space 15 inside the closed container 1. At this time, the refrigerant gas is blown out toward the earthen wall of the spherical sealed container 1, so most of the oil contained in the refrigerant gas is separated due to the layer change caused by the collision with the earthen wall. .

The separated oil flows along the earthen wall of the sealed container 1 toward the outer periphery of the fixed scroll 5 and is temporarily stored in each oil sump 17, then passes through the oil passage 18 and flows below the compression mechanism 2. be guided. On the other hand, the refrigerant gas with reduced oil content flows through the refrigerant passage 16 to the lower part of the compression mechanism 2, cools the electric motor 3, and is then discharged from the discharge pipe 20 to the outside of the closed container 1.

Furthermore, the oil guided downward from the compression mechanism 2 from the oil passage 18 flows down to the oil sump 4 at the bottom of the sealed container 1 through the passage 21 between the side wall of the sealed container 1 and the outer periphery of the electric motor 3 due to its own weight. do.

Therefore, in this embodiment, the refrigerant gas and oil are separated in the upper space 15 in the closed container 1, and the refrigerant gas and oil can be guided below the compression mechanism through separate passages, so that the oil can be separated. As explained above, according to the present invention, since there is no need to blow up oil once separated as in the conventional method, the amount of oil can be significantly reduced. The oil contained therein can be sufficiently separated, and the amount of oil coming up can be reduced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the hermetic scroll compressor of the present invention, and FIG. 2 is a sectional view taken along the line A-A in FIG. 1... Airtight container 2... Compression mechanism 3... Electric motor 4... Oil reservoir 5... Fixed scroll 6
...Orbital scroll 5a, 5a...Wrap
7...Frame 9...Crankshaft 10...
・Main bearing 11...Swivel bearing 14...Discharge port
15... Upper space 16... Refrigerant passage 17.
...Yurumisha 18...Oil passage.

Claims (1)

[Claims] A compression mechanism combining a fixed scroll and an orbiting scroll having a spiral wrap is disposed above the hermetic container, and an electric motor for driving the compression mechanism via a crankshaft is disposed below the hermetic container. An oil reservoir for lubricating oil to supply oil to the swing bearing and the main bearing is formed at the bottom of the container, and after the gas compressed by the compression mechanism is discharged from the discharge port of the fixed scroll into the upper space of the closed container, In a hermetic scroll compressor configured to flow the refrigerant downward to the electric motor side through a refrigerant passage between the airtight container and the refrigerant passage, an oil sump separate from the refrigerant passage is provided on the outer periphery of the compression mechanism, and the oil sump is compressed. A hermetic scroll compressor characterized by having an oil passage communicating with the lower part of the mechanism.