JPH0144795Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rotary compressor used in a refrigeration system, and particularly relates to an oil separation mechanism for discharged gas.

Conventional Structure and its Problems First, the conventional structure will be explained with reference to FIGS. 1 and 2.

In the figure, 1 is a closed container, and inside this closed container 1 is an electric element 3 connected by a rotating shaft 2.
A rotor 4 and a compression element 5 are housed therein. The upper bearing 6 of the compression element 5 is internally fixed to the inner surface of the closed container 1. 7 is a cylinder, and an upper bearing 6 and a lower bearing 8 are firmly attached to both ends of the cylinder. A roller 9 is slidably provided on the outer periphery of the eccentric portion of the rotating shaft 2, and a narrow groove (not shown) is provided in the cylinder 7, and a vane is slidably provided in the narrow groove. (not shown) is stored. 10
is a compression chamber defined by a cylinder 7, upper and lower bearings 6 and 8, and a roller 9. Oil grooves 11 and 12 are provided in the upper and lower journal parts of the rotating shaft 2.
Oil is supplied between the rotating shaft 2 and the upper and lower bearings 6 and 8 for lubrication.

The high pressure discharge gas compressed in the compression chamber 10 is
The upper and lower bearings 6, 8 and the discharge covers 15, 16 pass through the discharge valves 13, 14 provided on the lower bearings 6, 8.
The air enters the discharge chambers 17 and 18 defined by the air, is discharged into the closed container 1 from the blow-off hole 19 provided on the upper surface of the discharge cover 15, and then flows through the discharge pipe 20 to the refrigeration system. At this time, the air outlet 19
The high-pressure gas released from the rotor 4 separates the refrigerant and oil while rotating in the same direction as the rotation direction of the rotor 4, and drips from the oil drop hole 21 provided on the outer periphery of the upper bearing 6.

In such a conventional configuration, the opening direction of the oil drop hole 21 provided in the upper bearing 6 is perpendicular to the flow direction of the discharged gas which rotates in the same direction as the rotation direction of the rotor 2. Therefore, once the oil is separated, it is difficult to fall into the oil drop hole 21, and the rotation of the discharge gas causes the oil to be mixed into the gas again, impeding the effect of separating the refrigerant and oil of the discharge gas. The discharged gas mixed with such oil is sent to the electric element 3 and the sealed container 1.
from the discharge pipe 20 into the system through the gap. Oil therefore flows from the compressor into the system and
There were problems such as a lack of oil in the compressor and a decline in the performance of the heat exchanger in the system.

Purpose of the invention In order to reduce the oil flowing out from the compressor into the system, the invention uses the rotation of the rotor on the outer periphery of the upper bearing to effectively direct oil droplets flowing in the same direction downward of the upper bearing. The purpose is to recover and prevent oil from entering the system.

Structure of the invention In order to achieve the above object, the present invention provides a plurality of oil drop holes on the outer periphery of the upper bearing, each having an inner wall inclined in the same direction as the rotational direction of the rotor. The separated oil is efficiently collected under the upper bearing.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Incidentally, the same parts as those in the conventional example are given the same reference numerals, and the description thereof will be omitted.

In FIG. 3, the upper bearing 22 is internally fixed to the inner surface of the pressure vessel 1. A plurality of oil drop holes 23 are provided on the outer periphery of the upper bearing 22 and are inclined in the same direction as the rotational direction of the rotor 4 .

In this configuration, the oil-containing gas compressed in the compression chamber 10 is discharged into the discharge chambers 17 and 18 of the discharge covers 15 and 16 through the discharge valves 13 and 14, and is discharged into the closed container 1 from the blow-off hole 19. . The discharged gas is rotated in the same rotational direction by the rotation of the rotor 4 and separates oil and refrigerant. The separated oil droplets are deposited on the outer periphery of the upper bearing 22 on the rotor 4.
The oil easily flows into the plurality of oil drop holes 23 that are inclined in the same direction as the rotation direction of the oil, and is effectively collected below the upper bearing 6.

Effects of the invention As mentioned above, this invention has a
A plurality of oil drop holes are provided with inner walls inclined in the same direction as the rotation direction of the rotor, and the oil in the gas is separated into oil droplets, and the separated oil flows down the inclined inner walls and stagnates. In addition to preventing the oil from flowing downward and being efficiently recovered by the discharged gas, it also prevents the oil from being caught up in the gas again and leaking from the discharge pipe into the system, eliminating the lack of lubrication caused by insufficient oil in the compressor and increasing the reliability of oil lubrication. In addition, it has practical effects such as reducing the phenomenon of performance deterioration due to oil-containing refrigerant in the heat exchanger on the system side.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional rotary compressor, Fig. 2 is an enlarged sectional view of its main parts, Fig. 3 is a sectional view of a rotary compressor according to an embodiment of the present invention, and Fig. 4 is an enlarged sectional view of its main parts. It is a diagram. 1... Airtight container, 3... Electric element, 4... Rotor, 6, 22... Upper bearing, 21, 23... Oil drop hole.

Claims (1)

[Scope of utility model registration request] It includes an airtight container, an electric element including a rotor and a stator housed in the airtight container, and a mechanical element including an upper bearing, a cylinder, a shaft, and a lower bearing, and the upper bearing is connected to the airtight container. A rotary compressor comprising a plurality of oil drop holes which are inscribed and fixed on an inner surface and further have a plurality of oil drop holes on an outer periphery having inner walls inclined in the same direction with respect to the rotational direction of the rotor.