JPH0217188Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compressor, particularly a compressor suitable as a hermetic electric compressor.

An example of a conventional hermetic electric rotary compressor is shown in FIGS. 1 and 2, with FIG. 1 being a longitudinal sectional view and FIG. 2 being a sectional view taken along the line - in FIG. 1. In FIGS. 1 and 2, 10 is a housing;
Inside it is a motor rotor 9 and a motor stator 8.
an electric element A consisting of a crankshaft 1,
A compression element B consisting of a roller 2, an upper bearing 3, a lower bearing 4, a cylinder 5, a partition plate 6, a spring 7, etc. is accommodated. The crankshaft 1 is rotated by a motor stator 8 and a motor rotor 9, gives eccentric movement to the roller 2, changes the cylinder volume 5a, and sucks in and discharges gas. The suction gas passes through the accumulator 11 and the suction pipe 12 to the cylinder volume 5.
a, becomes high-pressure gas by compression, passes through the discharge valve 15, discharge valve hole 21, and discharge hole 22, passes through the discharge muffler 20, and the discharge gas passage 17, and then flows into the discharge pipe 18.
It is discharged out of the housing 10. On the other hand, the housing 10 is normally filled with lubricating oil up to the vicinity of the oil level 19, and rises inside the oil pump 14 through the lubricating oil suction port 13 to lubricate the rollers 2, the upper bearing 3, the lower bearing 4, and the like. The partition plate 6 is immersed in lubricating oil and reciprocates following the eccentric movement of the roller 2, so that it is sufficiently lubricated.

In the above compressor, the discharged gas in the discharge muffler 20 usually contains about 10% (by weight) of lubricating oil, but in a compressor with a small capacity of about 1.5KW,
Since the flow rate of the discharged gas is slow, the discharged gas and lubricating oil are relatively well separated, and the oil content in the gas leaving the discharge pipe 18 is about 0.2%. However, when the capacity of the compressor was about 2.2KW, the flow rate of the discharged gas became faster, resulting in poor oil separation.

Further, since the upper surface of the end ring 23 of the motor rotor 9 is located lower than the upper surface of the coil end 24 of the motor stator 8, the discharge gas that has risen in the discharge gas passage 17 is directed above the end ring 23 as shown by the arrow. When the flow direction is changed, the lubricating oil separated from the discharged gas adheres to the outer surfaces of the end ring 23 and the motor rotor 9, and this adhered lubricating oil is scattered by the centrifugal force caused by the rotation of the motor rotor 9 and the end ring 23. It collides with the inner circumferential surface of the coil end 24 and enters between the inner circumferential surface of the coil end 24 and the outer circumferential surface of the end ring 23 and between the outer circumferential surface of the motor rotor 9 and the inner circumferential surface of the motor stator 8. If the lubricating oil accumulates, the rotation of the end ring 23 and motor rotor 9 will agitate this lubricating oil, resulting in an increase in the power of the electric element.

The present invention was proposed in order to solve the above-mentioned drawbacks, and its gist is that an electric element consisting of a compression element, a motor rotor, and a motor stator is housed in a housing, and that a motor-driven element consisting of a compression element, a motor rotor, and a motor stator is housed in a housing. In a compressor in which discharged gas is discharged through a discharge pipe located at the upper center of the motor rotor, the top surface height of the end ring of the motor rotor is made higher than the top surface height of the coil end of the motor stator, and the discharge pipe The compressor is characterized in that the lower end of the end ring is located below the upper surface of the end ring.

Since the present invention has the above-mentioned configuration, the gas discharged into the housing from the compression element is rapidly changed in flow direction at the upper center of the motor rotor, and at this time, the lubricating oil contained in the gas is affected by its inertia. It is separated from the gas by the coil end and collides with the motor rotor and end ring and sticks to it, but when it is scattered upward due to the centrifugal force caused by the rotation of the motor rotor and end ring, the top surface height of the end ring is almost the same as the top surface height of the coil end. Because it is set at the same or higher height, it does not hit the coil end, but instead jumps over the coil end and collides with the inner surface of the housing, flows down along the inner surface of the housing, and accumulates at the bottom.
Therefore, lubricating oil does not accumulate between the outer circumferential surface of the end ring and the inner circumferential surface of the coil end, and between the outer circumferential surface of the motor rotor and the inner circumferential surface of the motor stator, as in the conventional case. Since this lubricating oil is not stirred, power loss of the electric element can be prevented.

Hereinafter, the present invention will be specifically explained with reference to an embodiment shown in FIG.

FIG. 3 is a vertical cross-sectional view showing the upper part of the electric element. In FIG. 3, 30 is an end ring of the motor rotor 9, and 31 is a partially cut out part of the end ring 30. By burying a light material, It is a formed counterweight. The discharge pipe 18 opens below the upper surface of the end ring 30. 35 is a coil end of the motor stator 8, the upper surface of which is positioned below the upper surface of the end ring 30. The rest of the structure is similar to the conventional one shown in FIG. 1, and the same reference numerals are given to the same members.

The discharge gas rising in the discharge gas passage 17 formed between the motor stator 8 and the housing 10 contains several percent of lubricating oil, but when this discharge gas flows into the discharge pipe 18, , discharge pipe 18
Since the opening is below the top surface of the end ring 30, the direction of the gas flow changes, but the lubricating oil in the discharged gas has a large inertia, so the direction cannot be changed suddenly, so it is separated from the gas. motor rotor 9
and collides with the end ring 30 and adheres to it. Since the motor rotor 9 and the end ring 30 are rotating, the oil flows onto the inclined surface 30 on the inner diameter side of the end ring 30.
a, jumps over the coil end 35 due to centrifugal force, collides with the inner top surface of the housing 10, and flows down to the lower part of the housing 10 along the inner surface of the housing 10.

In this way, since the upper surface of the end ring 30 is higher than the upper surface of the coil end 35, when the lubricating oil separated from the discharged gas is scattered by centrifugal force, it does not hit the coil end 35, and therefore the coil end 3
Since lubricating oil does not accumulate between 5 and end ring 30, loss of power for stirring the lubricating oil can be prevented. In the above embodiment, the upper surface of the end ring 30 is higher than the upper surface of the coil end 35, but even if the upper surface of the end ring 30 is approximately the same height, the separated lubricating oil can jump over the coil end and be scattered.
Further, the electric element is not limited to the rotary type, but may be of any type such as a reciprocating piston type, screw type, scroll type, vane type, etc.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a conventional hermetic electric rotary compressor, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 shows the upper part of an electric element showing an embodiment of the present invention. FIG. Housing...10, Compression element...B, Electric element...
A. Discharge pipe...18, End ring...30, Coil end...35.

Claims (1)

[Scope of utility model registration request] A compressor in which an electric element consisting of a compression element, a motor rotor, and a motor stator is housed in a housing, and discharge gas discharged from the compression element into the housing is discharged through a discharge pipe located at the upper center of the motor rotor. . A compressor, wherein the height of the top surface of the end ring of the motor rotor is higher than the height of the top surface of the coil end of the motor stator, and the lower end of the discharge pipe is located below the top surface of the end ring.