JPH0768948B2 - Scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll compressor for a refrigerator such as an air conditioner or a refrigerator.

2. Description of the Related Art A scroll-type compressor supplies a small amount of lubricating oil to a compression chamber for the purpose of sealing the leakage gap of a compression chamber composed of a fixed spiral blade and a swirling spiral blade and lubricating the sealing material at the tip of the blade. It is structured.

Generally, in a so-called "low pressure type" compressor in which the pressure of the refrigerant gas on the suction side acts inside the closed container, a lubricating oil reservoir is necessarily provided on the suction side, and the lubricating oil that has come out of the compression chamber remains unchanged. It is designed to be discharged from the compressor.

If the amount of lubricating oil discharged is too large, not only lubrication failure will occur, but also the refrigerating capacity of the refrigerator will decrease.

Therefore, it is important that the "low pressure type" compressor always supplies an appropriate amount of lubricating oil to the compressor.

FIG. 5 is an example of a conventional "low pressure type" scroll compressor.

The stator 2 and the rotor 3 of the electric motor are arranged inside the closed container 1, and the scroll type compression mechanism 4 is provided above the electric motor.
The crankshaft 5 of the drive shaft is connected to the rotor 3.

The refrigerant enters the closed container 1 through the suction pipe 6 and is sucked into the compression mechanism 4 through the suction port 7.

8 is a fixed spiral blade component, 9 is the spiral blade, and 10 is its end plate.

Reference numeral 11 is a swirl blade component, and 12 and 13 are respective spiral blades and end plates.

The spiral blades 9 and 12 are combined with each other to form a compression chamber 14 that reduces its volume while moving from the outer periphery toward the center to perform a compression action. The compressed refrigerant discharged from the discharge port 15 at the center of the fixed spiral vane component 8 is guided from the discharge chamber 17 of the compression mechanism frame component 16 to the compressor discharge pipe 18.

The pressure in the compression chamber 14 causes the swirling spiral blade part 11 to move to the compression chamber 14
The force applied to the opposite side of the bearing is supported by the thrust bearing 20 fixed to the bearing component 19.

The first main shaft 21 and the second main shaft 22 of the crankshaft 5 are supported by the bearing component 19.

A swivel drive bearing 23 is provided inside the first main shaft 21 so as to be eccentric from the axial center of the main shaft, and a swirl spiral blade component is provided in this swivel drive bearing.
The swing drive bearing 24 provided on the end plate 13 of 11 is fitted.

On the outer circumference of the thrust bearing 20, there are arranged rotation restraint parts 25 for restraining the rotation of the swirling spiral blade part 11 provided with keys 27 on both sides of a circular annular body 26a.

Lubricating oil 28 is stored in the lower part of the closed container 1, and an oil supply port 29 of the crankshaft 5 opens in this lubricating oil.

Lubricating oil is the oil supply hole 30, the oil supply groove 31, and the through oil hole of the crankshaft 5.
Through the oil groove 33 provided on the orbiting drive bearing 23, through the oil groove 34 provided on the thrust bearing 20, through the oil groove on the first main shaft 21, and discharged from the lubricating oil outlet 35 provided on the bearing component 19. It

The bearing component 19 is provided with a small-diameter oil passage 36 that communicates with the inside and outside of the thrust bearing 20. Depending on the difference between the pressure of the lubricating oil on the inner circumference of the thrust bearing and the pressure near the outer circumference of the spiral blades 9, 12. Lubricating oil is supplied to the compression chamber 14.

Problems to be Solved by the Invention However, the above-mentioned conventional configuration has a problem that the lubricating oil is not positively supplied to the compression mechanism 4 and the efficiency is reduced due to leakage of the compressed refrigerant or the compression mechanism 4 burns. It was

Means for Solving the Problems The technical means of the present invention for solving the above problems is to provide a key groove or a key on both sides of an annular body on the outside of a thrust bearing that axially supports a swirling spiral vane component. A self-constraining part with a different structure is placed to form an expansion / contraction space surrounded by the outer circumference of the thrust bearing, the inside of the annular body, the plane of the slewing blade bearing, and the plane of the bearing part. The distance is made smaller in the direction perpendicular to the reciprocating motion direction than the distance in the reciprocating motion direction of the annular body, and a lubricating oil supply circuit not communicating with the expansion space is provided inside the bearing plane of the thrust bearing or the thrust bearing, and An oil supply recess is provided in the blade bearing plane at a position where the oil supply recess alternately opens to the lubrication supply circuit and the expansion / contraction space according to the reciprocating motion of the annular body, and expands / contracts with the periphery of the blade of the swirling spiral blade part. The purpose is to form an oil supply passage that is open to and communicates with the space.

Action The action of the technical means of the present invention is as follows.

The oil supply dent provided on the plane of the swirl vane bearing brings out a certain amount of lubricating oil from the lubricating oil supply circuit to the expansion / contraction space for each revolution of the compressor. It is supplied to the outer circumference of the blade, that is, to a position immediately before the start of compression.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 3 of the accompanying drawings. Here, the same parts as those in the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, the outer peripheral shape of the thrust bearing 20 is a perfect circle, and the rotation restraint component 25a arranged outside thereof has a key 27a.
And reciprocating in the direction of arrow A. The inner diameter of the annular body 26a of the rotation restraint component 25a is formed so as to be smaller in the direction of arrow B, which is perpendicular to the direction of arrow A, as shown in FIG.

Further, the annular body 26a has a thickness such that it can freely move with a very small gap between the blade bearing flat surface 40 of the swirling spiral blade component 11 and the bearing component flat surface 41 on the bearing component 19 side.

Due to these dimensions and structure, the closed space surrounded by the outer circumference of the thrust bearing 20, the inner diameter of the annular body 26a, the blade bearing plane 40, and the bearing component plane 41 on the bearing component 19 side has a volume that reciprocates the rotating component 25a. It forms a pair of substantially closed space telescopic spaces 42, 43 that expand and contract alternately with movement.

The lubricating oil supply circuit is in contact with the blade bearing plane 40 by the thrust oil supply groove 44 provided inside the thrust bearing 20 and in the bearing plane thereof.

The blade bearing flat surface 40 is provided with an oil supply recess 45 at a position where it is alternately opened to the thrust oil supply groove 44 and the expansion space 42 or 43 by the orbiting motion of the orbiting spiral blade component 11 with respect to the thrust bearing 20.

Further, the end plate 13 is provided with an oil supply hole 46 that opens to the expansion / contraction space 42 or 43 and near the outer circumference on the side of the spiral blade 12.

FIG. 4 shows another embodiment of the present invention. Instead of providing the oil supply holes 46b and 46c in the end plate 13 of the above embodiment, the annular body 22 or bearing parts are used.
It is provided in 19.

EFFECTS OF THE INVENTION According to the present invention, a certain volume of lubricating oil is taken out from the lubricating oil circuit per one rotation, and the lubricating oil can be surely supplied to the position immediately before the start of compression, thus sealing the leakage gap of the compression chamber. The necessary lubricating oil is reliably supplied regardless of the rotation speed of the compressor, suction and discharge pressures, and there is no excess or deficiency, and there is no need to add extra parts. The compressor can be realized.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a scroll compressor showing an embodiment of the present invention, FIGS. 2 (a) and 2 (b) are respectively an exploded perspective view of a compression mechanism portion and a perspective view of a swirling spiral blade part in the compressor. Fig. 3 is a plan sectional view of the compressor, Fig. 4 is a longitudinal sectional view of a main part of a compressor showing another embodiment of the present invention, and Fig. 5 is a vertical sectional view of a scroll compressor showing a conventional example. It is a figure. 1 ... Closed container, 4 ... Compression mechanism, 8 ... Fixed spiral blade part, 9 ... Swirl blade, 10 end plate, 11 ... Swirl swirl blade part, 12 ... Swirl blade, 13 ... End plate, 14 ... ... compression chamber, 19 ...
… Bearings, 20 …… Thrust bearings, 25a …… Automatic restraint parts, 2
6a …… annular body, 27a …… oh, 40 …… blade bearing plane, 41
...... Bearing parts plane, 42 ・ 43 …… Expansion / contraction space, 44 …… Thrust oil groove, 46 ・ 46a ・ 46c …… Oil hole.

Claims (1)

[Claims] 1. A fixed spiral vane component and a swirl spiral vane component for compressing gas by providing spiral vanes on one surface of each end plate and combining the respective vanes with each other, and swirling the swirl spiral vane component. A driven crankshaft, and a bearing component that supports the main shaft of the crankshaft,
A thrust bearing for supporting the force in the direction of the rotation axis due to the compressive pressure applied to the swirl vane blade part in contact with the swirl vane bearing plane located on the side opposite to the vanes of the end plate, and the rotation of the swirl spiral vane component. A scroll type compression mechanism having a rotation restraining part for restraining is provided, the automatic restraining part is arranged outside the thrust bearing, and the rotation restraining part is provided with keys or key grooves on both sides of an annular body, respectively. The distance between the inner surface of the annular body and the outer periphery of the thrust bearing is set such that the distance in the direction perpendicular to the reciprocating direction is smaller than the average distance in the reciprocating direction of the annular body, and An expansion / contraction space surrounded by an inner surface, an outer peripheral surface of the thrust bearing, a plane on the bearing component side, and the swirl vane bearing plane is formed, and the expansion is formed on the bearing plane of the thrust bearing or on the inside of the thrust bearing. A lubricating oil supply circuit that does not communicate with the space is opened, and an oil supply recess is provided on the plane of the swirl vane bearing, and the position of this oil supply recess is alternated with the opening surface of the lubricating oil supply circuit according to the reciprocating motion of the annular body. A scroll compressor having a position that opens in the expansion space and further has oil supply passages that open to the vicinity of the outer periphery of the blade of the swirling spiral blade part and the expansion space and communicate with each other.