JPS61155681A - Rotary compressor - Google Patents

Abstract

PURPOSE:To enable a supply quantity of oil into a low pressure chamber to be smoothly controlled by a differential pressure between the inside of an enclosed vessel and the low pressure chamber, by providing in a vane an oil reservoir communicating with the inside of the low pressure chamber in the vicinity of the top dead center while with below a level of oil, accumulated in the enclosed vessel, in the vicinity of the bottom dead center. CONSTITUTION:A vane 14 provides an oil reservoir 21 communicating th the inside of a low pressure chamber 22 in the vicinity of the top dead center while with below a level of oil, accumulated in an enclosed vessel 1, in the vicinity of the bottom dead center. In this way, if the vane 14 while in operation of a compressor, connects the oil reservoir 21 with the low pressure chamber 22 in the vicinity of the top dead center, the vane, expanding gas melted in oil in the oil reservoir 21 and increasing virtual volume of oil, supplies this increase of oil into the low pressure chamber 22. If the vane 14 comes to the bottom dead center connecting the oil reservoir 21 with oil 4, the vane, decreasing virtual volume of oil in oil reservoir 21 by the pressure, allows the oil 4 to flow into the oil reservoir 21. By repetition of the above action, the compressor continuously supplies oil, accumulated in the enclosed vessel 1, into the low pressure chamber 22. Thus the compressor, enabling a supply quantity of the oil to be finely adjusted by a capacity of the oil reservoir 21, can select the optimum quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor, and more particularly to its oil supply mechanism.

Conventional configurations and their problems In general, for rotary compressors, a horizontal type is advantageous in terms of ease of installation, but since each sliding part is far from the oil surface, the oil pump needs to be devised. It is. The configuration of the conventional example and its problems will be explained below with reference to FIGS. In FIGS. 5 and 6, a closed container a contains a motor having a stator and a rotor C, and a compression device driven by this motor. In the compression device, a roller f fitted on an eccentric portion e of a shaft d rotates within a cylinder q as the shaft d rotates, and the roller f1
The inside of the cylinder is partitioned by the vanes h that are pressed against the cylinder 7c, so that the gas sucked through the suction pipe 1 is continuously compressed. The compressed gas is released into the closed container a and then discharged from the discharge pipe i. An oil groove 2 is provided on the side surface k of the vane h on the side of the low pressure chamber, and has openings both below the surface of the oil m accumulated in the closed container and in the low pressure chamber in the cylinder q. Therefore, oil is guided into the low pressure chamber during the suction stroke due to the pressure difference between the suction chamber and the inside of the closed container.
Provides lubrication for sliding parts. In such a configuration, the amount of oil supplied to the low pressure chamber can be changed by changing the passage cross-sectional area of the groove or by shortening the communication time between the low pressure chamber and the oil, but since oil is supplied by an extremely large pressure difference, This will result in over-fueling. As a result, the compressor has to compress a large amount of oil, leading to a significant increase in power consumption.
Since a large amount of oil is sent out from the discharged gas, there are drawbacks such as an insufficient amount of oil in the closed container.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to realize a mechanism for controlling the amount of oil supplied to a low pressure chamber based on the differential pressure between the inside of a closed container and the low pressure chamber.

Structure of the Invention In order to achieve this object, the present invention provides an oil sump in the vane that communicates with the inside of the low pressure chamber near the top dead center and below the surface of the oil accumulated in the sealed container near the bottom dead center. In this way, gas dissolved in oil in a high-pressure sealed container expands in a low-pressure chamber, and oil is supplied to cover the volume change that occurs in the low-pressure chamber.

Description of examples An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1 and FIG. 2, 1-1.1-2.1-3 is a closed container, and a motor consisting of a stator 2 and a rotor 3;
A compression mount driven by this motor is housed. 4 is oil that has accumulated in the closed container 1-1.1-2.1-3. 6 is a cylinder, θ and 7 are a motor side plate and an anti-motor side plate, respectively, which are closely attached to both sides of the cylinder 5 to form a compression chamber 8. 9 is the shaft and eccentric part 1
has 0. A roller 13 is inscribed in the compression chamber 8.

14 is a vane that is pressed against the roller 13, thereby partitioning the compression chamber 8 into a high pressure side and a low pressure side.

The vane 14 is provided with an oil sump 21 on the side surface 2o on the side of the low pressure chamber, which communicates with the inside of the low pressure chamber 22 near the top dead center and below the liquid level of the oil 4 in the closed container near the bottom dead center. Reference numeral 16 denotes a suction pipe, one end of which is fitted into the plate 7 on the opposite side of the motor, and the other end opened to the outside of the closed container 1-2. 16 is a discharge pipe which is welded to the closed container 1-2. 17 is a discharge valve provided on the plate 7 on the opposite side of the motor, 18 is a discharge muffler chamber 19
It is a cover that forms a

In the above configuration, the rotation of the rotor 3 is transmitted to the shaft 9, and the roller 13 fitted in the eccentric portion 1o rotates eccentrically within the compression chamber 8, and the vane 14 that is pressed against the roller 13 moves the roller 13 into the compression chamber 8. By dividing into high pressure side and low pressure side,
Gas sucked through the suction pipe 16 is continuously compressed.

The compressed gas is discharged from the discharge valve 17 and released into the discharge muffler chamber 19, and is then transferred to the closed container 1-1.1-2.
1-3 and is discharged from the discharge pipe 16.

FIG. 3 shows the inside of the cylinder 6 of the compressor of the present invention viewed from the side opposite to the motor, and 22 is a low pressure chamber. During operation of the compressor, the pressure inside the closed container 1-1.1-2.1-3 is high, so a large amount of high-pressure gas is dissolved in the oil 4. Third
When the vane 14 is near top dead center and the oil sump 21 communicates with the low pressure chamber 22, the gas dissolved in the oil in the oil sump 21 expands, causing an apparent Since the volume of oil increases, this increased amount of oil 4' is supplied into the low pressure chamber 22. Next, in FIGS. 3 and 4 (bl), the vane 14 reaches the bottom dead center and the oil sump When 21 communicates with oil 4,
The apparent volume of the oil in the oil sump decreases due to pressure,
Oil from the oil 4 enters the internal pressure of the oil sump 21 as shown by the arrow.

Closed container 1-1.1-2.1-3
The oil accumulated therein is continuously supplied into the low pressure chamber 22.

At this time, the amount of oil 4' supplied is such that the oil sump 21 is
This is only the apparent expansion of oil that occurs when communicating with oil sump 21, and the supply amount can be finely adjusted by adjusting the volume of oil sump 21, allowing selection of the optimum amount.

Effects of the Invention As is clear from the above explanation, the present invention has the following effects on the vane:
By providing an oil sump that communicates with the low-pressure chamber of the cylinder near top dead center and the oil accumulated in the circular part of the sealed container near bottom dead center, the gas contained in the oil in this oil sump can be It expands due to pressure, and the expanded oil is supplied to the cylinder low pressure chamber, so by changing the volume of the oil sump, it is possible to precisely control the amount of oil supplied, which has an extremely large practical effect.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the rotary compressor of the present invention, FIG. 2 is a perspective view of a vane in the compressor, and FIG.
Figure (al is a side view of the 7 cylinder of the same compressor seen from the side opposite to the motor, Figure 3 fbl is a similar side view in other operating states, Figure 4 is a side view of the 7 cylinder cylinder viewed from the side opposite to the motor, Figure 4 is a side view of the 7 cylinder cylinder viewed from the side opposite to the motor, Figure 4 is a side view of the same compressor in another operating state, )
5 is a vertical sectional view of the main part of an embodiment of a conventional rotary compressor, and FIG. 6 is a perspective view of the vane thereof. 4...Oil, 5...Cylinder, 6...
...Motor side grate, OK...Non-motor side plate, 8...Pressure J1113...Roller, 14...Vane, 21... ...Oil sump. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2! 42/-oil r='s21-11 effect ((IL)
(b) (αn
(b) Figure 5 Figure 6

Claims (1)

[Claims] a motor having a stator and a rotor in a sealed container;
A shaft rotated by this motor, a cylinder forming a compression chamber, a motor side plate and a non-motor side plate that are in close contact with both sides of this cylinder, a roller piston that is inscribed in the compression chamber and rotates eccentrically, and a tip end. It has a compression device consisting of a vane whose part presses against the roller piston to partition the compression chamber into high and low pressure sides, and the vane has a vane which is connected to the low pressure chamber of the cylinder near the top dead center and into the closed container near the bottom dead center. A rotary compressor characterized by having an oil sump that communicates with accumulated oil.