JPS62118090A - Rotary compressor - Google Patents

Abstract

PURPOSE:To facilitate starting by connecting an oil groove on a shaft which is formed in such a way that it does not extend out of a bearing part, to the inside of a case by means of a slit having a small cross section, to make high and low pressures balanced easier when a compressor has stopped. CONSTITUTION:A slit 13 for making a refrigerant in an enclosed case 8 flow into an oil groove 5 when a compressor is stopped, is formed on a shaft 1 so as to connect the oil groove 5 which is stopped halfway at a main baring 6, into the enclosed case 8. And, its cross section is formed very small. Thereby, when a compressor is operated, it is impossible for the refrigerant in the enclosed case 8 to flow back to a shaft eccentric part 9 due to the flow resistance of the slit 13 and to the spiral rotation of the oil groove 5, and is fed to each sliding part through an oil feed pipe 11 and an oil port 10 due to difference in pressure. On the other hand, when the compressor is stopped, the refrigerant in the enclosed case 8 flows back to the inside of a cylinder 4 and, further, on the low pressure side, through the slit 13 and via the oil groove 5, thereby, balancing high and low pressures, to facilitate starting.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor, and particularly to a starting load reduction mechanism thereof.

Conventional technology One method of lubricating a rotary compressor takes advantage of the fact that the pressure at the eccentric part of the shaft is lower than in the closed case when the compressor is operating, and drains the oil accumulated at the eccentric part and the bottom of the compressor into the bearing. A method was adopted in which oil was supplied to the shaft through a hole or pipe provided in the flange.

The configuration of the conventional example and its problems will be explained below with reference to the drawings. In FIG. 3, a shaft 1 rotates by the force of a rotor 2, moves a roller piston 3, and compresses the refrigerant in a cylinder 4. The oil groove 6 of the shaft is connected to the main bearing 6. Only the inside of the auxiliary bearing 7 is machined, and it does not communicate with the inside of the sealed case 8. During operation of the compressor, the refrigerant and oil near the eccentric portion 9 of the shaft are sucked into the cylinder 4 from the end surface of the roller piston 3, so the pressure near the eccentric portion 9 of the shaft is lower than the pressure inside the sealed case 8. Become. An oil supply hole 1o drilled in the flange of the auxiliary bearing 7 and an oil supply pipe 11 press-fitted into the tip of the oil supply pipe 11 connect the oil 12 collected at the bottom of the sealed case to the shaft eccentric part 9, thereby distributing the oil to each sliding part. can be sent to.

Problems to be Solved by the Invention However, in the above configuration, if the oil groove of the shaft is machined outside the bearing, the pressure at the eccentric part of the shaft will not decrease and oil cannot be supplied. 6 is not machined, and the end of the bearing 6 is sealed. Therefore, when the compressor is stopped, the refrigerant cannot pass through the entire oil groove 6 and flow back into the cylinder from the shaft eccentric part 9. There was a problem in that the high and low pressures were difficult to balance, making it difficult to start the compressor.

Therefore, the present invention provides a rotary compressor in which high and low pressures are easily balanced when the compressor is stopped in a differential pressure oil supply system.

Means for solving all the problems In order to solve all the above problems, the rotary compressor of the present invention has the following steps:
By creating a passageway with a narrow cross-sectional area between the oil groove that is machined into the shaft so that it does not leak out from the bearing and the inside of the sealed case, it is easy to balance the high and low pressures when the compressor is stopped, and when the compressor is started. It makes it easier.

Effect of the present invention Due to the above-described configuration, when the compressor is in operation, there is a differential pressure required for oil supply, and when the compressor is stopped, the refrigerant in the sealed case passes through the oil groove and flows back to the low pressure side, so that the high and low pressures are balanced. This makes it easier to fully start the compressor.

EXAMPLE A rotary compressor according to an example of the present invention will be described below with reference to the drawings. Since the same numbers as in FIG. 3 indicate the same parts and have the same functions, their description will be omitted to avoid duplication.

In FIG. 1, 13 is a slit that allows the refrigerant in the sealed case 8 to flow into the oil groove 5 when the compressor is stopped.
The oil groove 6, which is stopped midway through the bearing, is machined to communicate with the inside of the sealed case 8, and its cross-sectional area is extremely narrow, less than 1. A pressure difference is created between the shaft and the inside of the sealed case, and the refrigerant inside the sealed case flows easily to the eccentric part of the shaft when the shaft is stopped. FIG. 2 is a fully enlarged cross-section taken along the line A-A in FIG. During compressor operation, the flow resistance of the slit 13 and the oil groove 5
Due to the helical rotation of the refrigerant, the refrigerant in the sealed case 8 cannot flow back to the shaft eccentric part 9, and the oil 12 is supplied to each sliding part through the oil supply pipe 11 and the oil hole 1o due to the differential pressure. When the compressor is stopped, the resistance due to the helical rotation of the oil groove 6 disappears, and the refrigerant in the sealed case 8 flows back through all the slits 13, through all the oil grooves 6, into the cylinder 4, and further to the low pressure side, increasing the high and low pressure. But balance.

Effects of the Invention As described above, the present invention provides communication between the oil groove of the shaft, which is machined to prevent it from coming out of the bearing, and the inside of the sealed case through a slit with a narrow cross-sectional area, thereby preventing the compressor from being stopped. This can sometimes make it easier to balance high and low pressure compression forces.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a rotary compressor according to an embodiment of the present invention, Fig. 2 is an enlarged cross-sectional view of main parts taken along line A-A in Fig. 1, and Fig. 3 is a longitudinal cross-section of a conventional rotary compressor. It is a diagram. 1...Shaft, 3...Roller piston, 4...Cylinder, 6...Oil groove,
6... Main bearing, 7... Auxiliary bearing, 8...
... Sealed case, 13 ... Slip), 1
5...Bane.

Claims (1)

[Claims] Inside the sealed case are a motor, a shaft rotated by the motor, a cylinder forming a compression chamber, a main bearing and an auxiliary bearing that are in close contact with both sides of the cylinder, and are inscribed in the compression chamber and rotate eccentrically. A compression device includes a roller piston and a vane whose tip is in pressure contact with the roller piston to partition the compression chamber into high and low pressure sides, and an oil groove of the shaft processed so as not to come out from the bearing. , a rotary compressor that communicates with the inside of the sealed case through a slit with an extremely narrow cross-sectional area.