JPS62199992A - Enclosed rotary compressor - Google Patents

Abstract

PURPOSE:To prevent an oiling amount from reduction by mounting a disk on a rotary shaft of a rotor of a motor element, while forming a plurality of projections extending radially on the surface of the disk to separate effectively oil included in refrigerant. CONSTITUTION:A rotary shaft 5 projecting from the upper portion of a motor element 2 received in an enclosing container 1 is provided with a disk 6 for preventing refrigerant including oil flowing from below the motor element 2 from flowing directly into a discharge pipe 12. And this disk 6 is formed on the surface with a plurality of projections 6a extending radially. In such constitution, since refrigerant flowing in the upper space of the motor element 2 flows radially by the rotation of the disk 6, oil content can be efficiently separated by centrifugal action, while the oil content can be securely spattered by a centrifugal fan action of the projections 6a so that an oiling amount can be prevented from reduction due to the reduction of refrigerant oil 8 below the enclosing container 1.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a rotary hermetic compressor, and in particular to an oil discharge w
This invention relates to a rotary compressor suitable for reducing the amount of ring metal.

[Background of the invention]

A conventional hermetic compressor is constructed by incorporating, for example, a 2wl electric motor, and therefore is operated at a constant rotational speed. Refrigerators and air conditioners incorporating such a compressor employ an operation control method in which the compressor rotates at a constant speed intermittently in accordance with the refrigeration load. In this way, the compressor, which is simply the source of vibration, is operated at a constant speed, so it is relatively easy to understand the vibration situation, and countermeasures can be taken to some extent by focusing on the natural frequency of the support member. It is possible to obtain a reduction effect.

However, from the viewpoint of the compressor's electrical input, the load torque at startup is large, so more power is required.

Energy loss increases.

rJJI like this! As a means to solve this problem, it is possible to change the rotational speed of the compressor over a wide range and to avoid intermittent operation control. However, if the rotational speed of the compressor is varied over a wide range, the following problems arise. That is, as the amount of refrigerant circulating increases, especially in high-speed rotation ranges, the lubricating oil inside the compressor mixes with the refrigerant and is carried out.

The lubricating oil becomes insufficient, and the rII properties of the bearing or pump part deteriorate.

As a means to solve such lubricating oil shortage, for example, as shown in FIGS. 4 and 5, a flat disc 24 that rotates together with the rotor 4 is attached to the upper part of the rotor 4, and the connection between the rotor 4 and the electric element 2 is The liquid mixture of oil and refrigerant that has risen through the gap and the gap between the sealed container 1 and the stator 3 is brought into contact with the rotating disc 24, thereby separating the refrigerant and the oil. That is, oil is separated by being blown away in the radial direction by the centrifugal force of the rotating disk 24. The blown oil falls to the bottom of the sealed container 1 again through the gap between the rotor 4 and the electric element 42 or the gap between the sealed container 1 and the stator 3. Meanwhile, the separated refrigerant is discharged into the connected refrigeration cycle through the discharge pipe I2.

However, this type of hermetic rotary compressor has the following drawbacks.

That is, since the disc is a flat plate, oil cannot be scattered in a concentrated manner, resulting in a poor oil separation effect. Another problem was that if the oil were to float even a little from the disc, it would not be scattered at all and could not be separated.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a hermetic rotary compressor that can vary the rotational speed over a wide range and that can ensure a sufficient amount of oil circulation in a high-speed rotational range.

[Summary of the invention]

In order to achieve such an object, the present invention provides a hermetic rotary compressor comprising a rotary shaft that connects an electric element and a compression element housed in a closed container, and a rotor attached to the rotary shaft. The present invention is characterized in that a disk is attached to either the rotating shaft or the rotor, and a plurality of protrusions extending in the radial direction are provided on the surface of the disk.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of a hermetic rotary compressor according to the present invention, and FIG. 2 is a perspective view of a flat plate used in the hermetic rotary compressor of the present invention.

In the figure, reference numeral 1 denotes a closed container, which includes an electric element 2 and a compression element 10 inside. The electric element 2 is composed of a stator 3 press-fitted into a closed container 1 and a rotor 4 press-fitted into a rotating shaft 5. The rotating shaft 5 transmits the electromagnetic torque of the electric element 2 to the compression element 10. Reference numeral 6 denotes a disk which is fixed to either the rotating shaft 5 or the rotor 4. As shown in FIG. 2, on the surface of the disk 6, convex portions 6a extending in the radial direction of the disk are provided integrally with the disk and at equal intervals. A displacement sensor 7 is provided at a position facing the convex portion 6a of the disk 6. Reference numeral 8 denotes lubricating oil, which is stored at the bottom of the closed container 1. 9 is a discharge valve attached to a part of the compression element 10. , 11 is a suction pipe for sucking refrigerant from a refrigeration cycle (not shown) into the sealed container 1. 12
is a discharge pipe that allows compressed refrigerant to flow into the refrigeration cycle. 13 is a rotary compressor made up of such components.

However, the refrigerant that has returned from the refrigeration cycle is in the suction pipe 1.
1 into the compression element 10. The refrigerant flowing into the compression element 10 is compressed and discharged into the closed container 1 from the discharge valve 9. At this time, the refrigerant is mixed with the lubricating oil sucked up by the rotating shaft 5. This refrigerant is the arrow (8) in Figure 1.
8' is a lubricating oil, and 8' is a refrigerant. 2
flows into the upper space of the The refrigerant that has flowed into the upper space of the electric element 2 comes into contact with the rotating disk 6. When the refrigerant comes into contact with the disc 6, only the lubricating oil 8 is blown off in the radial direction from the axis of the disc 6 due to the centrifugal separation action of the disc 6. At this time, the rotation of the disc 6 adds the effect of a centrifugal fan to the convex portion 6a, so that the flow of the lubricating oil 8 in the radial direction is promoted. Furthermore, since the mist of lubricating oil 8 that has risen to the height of the convex portion 6a can be caught and blown away in the radial direction, the effect of separating the refrigerant 8' and lubricating oil 8 is increased.

Here, the difference in oil discharge amount between the compressor of the present invention and a conventional compressor is shown in FIG.

In the figure, in the conventional compressor, the amount of oil discharged increases in the high speed rotation region, but with the compressor of the present invention, the amount of oil discharged in the high speed rotation region can be suppressed to the minimum.

〔Effect of the invention〕

According to the present invention, since the amount of oil discharged to the outside of the compressor can be reduced, reliability can be ensured by eliminating a decrease in the amount of oil supplied to the sliding surface of the compression element due to a decrease in the amount of refrigerating machine oil in the compressor.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hermetic rotary compressor of the present invention, FIG. 2 is a perspective view of a disc used in the hermetic rotary compressor of the present invention, and FIG. 3 is a view of a compressor of the present invention and a conventional compressor. Fig. 4 is a vertical cross-sectional view of a conventional hermetic rotary compressor, and Fig. 5 is a perspective view showing a flat plate used in a conventional hermetic rotary compressor. . ■...Airtight container, 2...Electric element, 3...Stator. 4... Rotor, 5... Rotating shaft, 6... Disc, 7...
... Displacement sensor, 8... Refrigerating machine oil, 9... Discharge valve,
DESCRIPTION OF SYMBOLS 10... Compression element, 11... Suction pipe, 12... Discharge pipe, 13... Compressor, 14... Speed detection signal, 1
5... Arithmetic unit, 16... Torque control section, 17...
Rotation speed control device, 22... Speed detection signal reference level, 23... Average rotation speed, 24... Disc of conventional hermetic compressor. ), represented by patent attorney Katsuo Ogawa. hjFK + Maru Co Gakuta B, (rP?n,) $4 figure $5 cause

Claims (1)

[Claims] In a hermetic rotary compressor comprising a rotating shaft that connects an electric element and a compression element housed in an airtight container, and a rotor attached to the rotating shaft, a disc is mounted on either the rotating shaft or the rotor. A hermetic rotary compressor, characterized in that a plurality of protrusions extending in the radial direction are provided on the surface of the disc.