KR0127217B1 - Scroll compressor - Google Patents

Abstract

The oil feeding device of a scroll compressor is provided with an elastic member which is inserted into a predetermined space between a rolling piston and a crank shaft, thus to prevent an excessive pressure within the compressor, whereby an appropriate amount of feeding oil can be adjusted in accordance with the variation of an operation speed.

Description

Oil supply automatic control device of scroll compressor

1 is a partial cutaway longitudinal sectional view showing the configuration of a general scroll compressor.

Figure 2 is a plan view showing the configuration of the automatic refueling amount of the conventional scroll compressor.

3 is a plan view showing the configuration and operation of the automatic lubrication amount of the scroll compressor of the present invention.

* Explanation of symbols for main parts of the drawings

4: crankshaft 9: rolling piston for oil supply

20: elastic means S: space part

C: clearance

The present invention relates to a variable speed scroll compressor, and in particular, in the rolling piston type oil supply device for lubrication, an elastic means is inserted at a predetermined gap between the rolling piston for fuel supply and the crankshaft to prevent damage to each part due to excessive oil supply. In addition, the present invention relates to an automatic fuel supply amount control device for a scroll compressor to reduce power loss. An example of a general scroll compressor will be described with reference to FIG.

The fixed scroll (1) is fixed to the main frame (3), the scroll compressor (2) for compressing the refrigerant by the slow motion on the upper surface of the fixed scroll (1) is fixed to the eccentric portion of the crankshaft (4) In addition, the scroll compressor 2 is provided with a rotation preventing mechanism to prevent the rotation of the scroll compressor (2).

The scroll compressor configured as described above has the fixed scroll (1) and the scroll compressor (2) as the refrigerant gas sucked through the suction pipe is sucked at both ends of the scroll circumference at the same time according to the swing motion of the swing scroll (2). It is compressed to the center of and discharged to the discharge pipe through the discharge hole.

In order to smoothly compress and discharge the refrigerant gas of the scroll compressor as described above, the main parts of the compressor are supplied with oil. An oil supply pump for a rolling piston for lubrication, which is an example of such an oil supply device, is illustrated in FIG. Explain.

An oil supply cylinder is formed in the subframe 5 that supports the lower end of the crankshaft 4, and an inlet 6, an outlet 7, and a diaphragm groove 8 are formed in the oil supply cylinder. . The suction port 6 is connected to an external oil reservoir, the discharge port 7 is connected to the oil supply groove inside the crankshaft 4 along the connection groove formed in the lower cover 8, the diameter of the oil supply cylinder The oil supply rolling piston 9 is smaller than the inner diameter of the oil supply cylinder and the diaphragm protrusion 9a protrudes at a predetermined portion of the outer circumferential surface, and the eccentric pin 10 on the crank side is provided on the upper surface of the oil supply rolling piston 9. Is fitted.

When the crankshaft 4 is rotated clockwise during operation of the compressor, the oil supply device configured as described above rotates the oil supply rolling piston 9 counterclockwise, whereby oil is introduced from the inlet 6 to the discharge port. Moved to (7) is supplied to the upper side along the oil supply groove (not shown) formed in the crank side (4) of the lower cover (8).

As described above, the oil supplied to the sliding part not only prevents lubrication of the sliding surface but also cools and prevents oxidation of the surface. Therefore, it is important to properly control the amount of oil supplied. This can be called.

In other words, when the amount of lubrication is small, there is a problem of deterioration of oil due to abrasion of the sliding surface and high heat, whereas when the amount of lubrication is too large, the oil does not go out through a predetermined sliding gap, and excessive pressure is applied. Unnecessary power loss and other parts of the refueling pump will cause problems.

In the conventional oil supply device as described above, since the rolling piston for lubrication is supplied by the rotation of the crankshaft, the oil is supplied, so that the amount of lubrication is excessively increased due to excessive rotation of the crankshaft, causing unnecessary power loss in the compressor. there was.

The object of the present invention devised in view of such a problem is to reduce unnecessary power loss by appropriately adjusting the amount of oil being lubricated.

In order to achieve the object of the present invention, the oil supply rolling piston and the crankshaft having a fuel supply rolling piston which is formed in the sub-frame inside the oil supply cylinder and operated in the oil supply cylinder on the top of the crankshaft. A constant space is formed therebetween, and an elastic means for elastically supporting the rolling piston is inserted into the space so that the rolling piston retreats in the direction of decreasing the eccentricity due to the pressure when the oil supply is excessively increased as the operating speed increases. The oil is leaked by the gap generated between the inner circumferential surface of the rolling piston and the outer circumferential surface of the eccentric pin, and excessive pressure is applied to the oil supply pump and other moving parts to prevent power loss. Oil supply automatic control device is provided.

Hereinafter, the present invention as described above will be described in more detail based on one embodiment shown in the accompanying drawings.

FIG. 3 is a plan view showing the configuration of the automatic adjustment of the oil supply amount of the scroll compressor according to the present invention. As shown in the drawing, the oil supply amount automatic adjustment device according to the present invention is supplied by the rotation of the cradle 4. The useful rolling piston 9 is rotated in the opposite direction to suck the oil and discharge it to each part is the same as the conventional oil supply device.

Here, the apparatus of the present invention forms a constant space (S) between the rolling piston (9) for lubrication and the eccentric pin (10) of the crankshaft, and resilient the rolling piston (9) for lubrication in this space (S). When the oil supply rolling piston 9 is retracted in a direction in which the amount of eccentricity decreases when the oil supply amount is excessively increased by installing the elastic means 20 to support, between the inner circumferential surface of the oil supply rolling piston 9 and the circumferential surface of the eccentric pin 10 A gap (C) is generated to prevent the occurrence of excessive pressure in the oil supply device while lubricating oil leaks through the gap (C).

The oil supply amount due to the proper difference between the oil supply cylinder and the rolling piston 9 is designed based on a minimum operating speed. When the amount of oil supply is small, the inner circumferential surface of the rolling piston 9 and the solid line shown in FIG. While the gap between the outer circumferential surface of the eccentric pin 10 is constantly maintained, one side of the outer circumferential surface of the rolling piston 9 for oil supply is kept in close contact with the inner circumferential surface of the oil supply cylinder. The oiling rolling piston 9 is retracted in a direction in which the amount of eccentricity becomes smaller against the elastic means 20 as shown by the phantom line shown in FIG. 3, so as to fit between the outer circumferential surface side of the oiling rolling piston 9 and the oil supply cylinder inner peripheral surface. A gap (C) is generated so that the lubricating oil leaks into the gap so that excessive pressure is not applied to the moving parts such as the oil supply device, thereby preventing power loss. All.

Selection of the initial displacement δ ₀ and the elastic modulus K of the elastic means 20 is closely related to the oil supply amount and the power loss amount according to the driving speed.

As described above, the automatic refueling amount of the scroll compressor according to the present invention has the effect that can be reduced to the maximum loss of power due to excessive refueling due to the excessive pressure is adjusted according to the change in the operating speed of the compressor. There is.

Claims (1)

An oil supply cylinder is formed inside the subframe, and a rolling oil supply piston is operated in the oil supply cylinder on the top of the crankshaft, and a constant space is formed between the oil supply rolling piston and the crankshaft. Inserting an elastic means for elastically supporting the rolling piston in the part, when the lubrication amount is increased due to the increase in operating speed, the rolling piston is retracted in the direction of reducing the eccentricity by the pressure, the inner circumferential surface of the rolling piston and the outer circumferential surface of the eccentric pin Oil leakage automatic control device of the scroll compressor, characterized in that it is configured to prevent the loss of power caused by excessive pressure on the fuel pump and other moving parts caused by the leakage of oil caused by the gap between.