JPS62168976A - Structure of rotor of rotation speed variable compressor - Google Patents

Abstract

PURPOSE:To prevent an oil face from being disturbed by the end part of a rotor and prevent lubricating oil from flowing out of a compressor by keeping the balance of rotation without forming irregularity on the end part on the oil face side of a rotor. CONSTITUTION:A part of the periphery of the end ring 15 of a rotor formed with aluminum, etc. is cut out, forming a projected part 15'. A cutout ring 20 having the same shape as the cut-out part while having a different specific gravity from that of the projected part 15', e.g., of a zinc alloy brass, etc. is formed. And, this cutout ring 20 is closely installed to the cut-out part of the end ring 15 leaving no space between them, to keep the balance of rotation by means of difference in specific gravity between the projected part 15' and the cutout ring 20.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to the structure of a rotor used in a variable rotation speed compressor that operates by changing the rotation speed.

[Prior art]

In particular, some home room conditioners control the air conditioning capacity by increasing or decreasing the rotation speed of the compressor according to the air conditioning load (according to the air conditioning load).The rotation speed control box 1m required for the annual air conditioning load is large, and the reliability of the compressor is affected. Especially during high-speed operation, the lubricating oil inside the compressor flows out of the compressor together with the refrigerant, resulting in a low oil level inside the compressor.The main rumor is that during high-speed operation, the lubricating oil inside the compressor leaks out of the compressor together with the refrigerant. FIG. 1 shows the structure of a conventional general compressor that reduces the flow rate to the compressor and prevents the curved surface from decreasing.

An electric motor part 2 is arranged in the upper part of the case, and an 8E compression mechanism part J is arranged in the lower part, and lubricating oil 4 is stored in the bottom part of the case.

The stator 5 is fixed on the case, and the rotor 6 is fixed on the upper part of the crank pongee 7. The compression chamber is a cylinder 9, an upper bearing 8. The roller 12 formed by the lower bearing IO and rotatably fitted into the eccentric portion 7' of the crankshaft 7 revolves eccentrically as the crankshaft 7 rotates, and a partition plate (not shown) separates high pressure and low pressure, thereby discharging the refrigerant gas. It has a compressible structure.

The compressed gas is discharged into the D size sensor 13, passes through the gas passage of the lower bearing 10, the cylinder 9.degree. sea urchin bearing 8, and is released into the case as indicated by the broken line arrow.

A spiral groove 14 for oil supply is installed on the shaft 7 to lubricate the EK upper bearing 8. The upper and lower ends of the rotor 6 have end rings 15.16, and cut-out rings 17.18 are provided on the end rings 15.16 to balance the centrifugal force caused by eccentric rotation of the eccentric portion 7' of the shaft 7 and the roller 12. is installed. When operating at high speed with this conventional structure, a large amount of lubricating oil is discharged from the D pipe 19, causing the oil level 4 to drop.The reason for this is that the design of the oil supply spiral groove 14 allows for sufficient oil supply even at low speeds. Therefore, at high speeds, a very large amount of lubricating oil flows through the oil supply spiral 14 to the outlet 1.
Since the rotor 6 is rotating at a high speed, it flows out from the end ring 15 and flows as shown by the broken line arrow. As shown in FIG. 2, the notched ring 17 is fixed to the end ring 15 and rotates at high speed, so the lubricating oil that flows out as shown by the broken arrow violently collides with the side surface 21 of the notched ring 17 and is atomized into mist. It was discovered that the refrigerant gas flowed out from the D pipe 19 due to the flow of refrigerant gas. Another main cause is that the overlined gas contains a large amount of lubricating oil, but the refrigerant gas that flows out from the gas passage of the upper bearing 8 as shown by the broken arrow collides with the notch ring 17 and forms a mist. The particles become fine and flow out from the D pipe 19 without reaching the top of the case. Further protruding cutout ring 17
Since the rotor rotates at a high speed, a swirling flow of refrigerant gas is generated, which disturbs the oil level 4 and causes splashes to flow out, mainly at the lower part of the rotor 6. A protrusion 15' is formed in a part of the circumference of the end ring 15 in the thickness direction, and the protrusion 15'
The inner diameter, outer diameter, and height dimensions are the same, and the circumference length or end ring 15
As shown in FIG. 4, a cut-out ring 20 having a circumferential length that is approximately the same as the length of the circumference other than the convex portion 15' and made of a material different from the specific gravity of the convex portion 15', if necessary, is attached with almost no gap. Generally, the end ring 15 is made of aluminum.

The notched ring 20 is made of zinc alloy brass or the like, and the amount of unbalance can be set based on the difference in specific gravity between the two. With the above-mentioned device, the side surface 21 of the notched ring 17 shown in FIG. A part of the circumference of the end ring is a convex part in the thickness direction of the end ring, and another part of the circumference has an inner diameter, an outer diameter, and a thickness that are approximately the same as the convex part, but a specific gravity that is different from that of the end ring. Since the notched ring was installed with almost no gaps, the side surface of the notched ring was hidden by the side surface of the convex part, and during high speed rotation, the lubricating oil flowing out from the oil supply spiral groove of the upper bearing and the refrigerant gas flowing out from the gas passage of the upper bearing were mixed in. Refine lubricating oil.

1'+ from the D pipe with the flow of refrigerant gas.
: It has the effect of reducing the IJ flowing to Funai no Hachi to Inu 1 Rin. Furthermore, the disturbance of the curved surface is reduced, which reduces lubricant leakage.

[Brief explanation of drawings]

FIG. 4 is a view of FIG. 3 viewed from direction P, and FIG. 5 is a view of the notched ring. U...Case, A...Packing section, D...Compression mechanism section, 4...Lubricating oil curved surface, 5...Stator, 6...Rotor, 7...Crankshaft , 7'... Eccentric part, 8
...Upper bearing, 9...Cylinder #-, 10...
Lower bearing, 12... Roller, 13... D size sensor, 14... Spiral groove for oil supply, 14'... Outlet, 15... End ring, 16... End ring. 17... Notched ring, 18... Notched ring, 19... D pipe. 20... Notch ring, 21... Side surface, 15'... Convex portion.

Claims (1)

[Claims] A variable rotation speed compressor that operates over a wide range from low speed to high speed by changing the rotation speed as necessary, has a part of the circumference of the end ring of the motor rotor as a convex part in the thickness direction of the end ring, and other parts. A rotor for a variable rotation speed compressor, characterized in that a notched ring having an inner diameter, an outer diameter, and a thickness that are approximately the same as those of the convex portion and having a specific gravity different from that of the end ring is attached almost without gaps to the circumferential portion of the rotor. structure.