JPS62178794A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent seizure of a compressing mechanism, by securely supplying lubricating oil of a prescribed volume, which is taken from a lubrication oil supply circuit to an expanding and contracting space, to a position just in front of the position where compression begins by an oil supply recess provided with a turning blade shaft receiving flat surface every time a compressor makes one revolution. CONSTITUTION:A blade shaft receiving flat surface 40 has an oil supply recess 45 provided at a position which is opened alternately to a thrust oil supply groove 44 and extending and contracting spaces 42 or 43 by a turning motion of a turning spiral blade part 11 to a bearing 20. In addition, a mirror plate 13 is provided with an oil supply hole 46 which is opened to the expanding and contracting spaces 42 or 43 and adjacent to the periphery on the side of spiral blades 12. With such an arrangement, lubricating oil of a prescribed volume is taken from a lubricating circuit every time a compressor makes one revolution so that the lubricating oil is securely supplied to the periphery of the turning spiral blades 12, that is, to a position just prior to the position where.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a scroll compressor for refrigerators such as air conditioners and refrigerators.

Conventional technology Scroll compressors store a small amount of lubricating oil in the compression chamber, which is made up of fixed spiral blades and rotating spiral blades, in order to seal the leakage gap and lubricate the sealant at the tip of the blade. It has a structure.

In general, so-called "low-pressure" compressors, in which the pressure of refrigerant gas on the suction side acts inside a closed container, are necessarily equipped with a lubricating oil reservoir on the suction side, and all the lubricating oil that comes out of the compression chamber is It is designed to be discharged as is from the crusher.

If the amount of lubricating oil discharged is too large, it not only causes poor lubrication 2 but also reduces the refrigerating capacity of the refrigerator.

Therefore, it is important for a "low pressure type" compressor to always supply an appropriate amount of lubricating oil to the compression chamber.

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

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

The refrigerant enters the closed container 1 from the suction pipe 6 and is sucked into the compression mechanism 4 from the suction lower.

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

Reference numeral 11 is a rotating spiral blade part, and 12 and 13 are respective spiral blades and mirror plates.

The spiral vanes 9 and 12 are combined with each other to form a compression chamber 14 which compresses by reducing its volume while moving from the outer periphery to the center. 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 .

A thrust bearing 20 fixed to a bearing component 19 supports the force by which the swirling spiral vane component 11 is pressed against the opposite side of the compression chamber 14 due to the pressure in the compression chamber 14 .

The @1 king shaft 21 and the second main shaft 22 of the crankshaft 5 are supported by a bearing component 19.

A swing drive bearing 23 is provided inside the first main shaft 21 eccentrically from the axis of the main shaft, and a swing drive shaft 24 provided on the mirror plate 13 of the swing spiral blade component 11 is fitted into this swing drive bearing.

On the outer periphery of the thrust bearing 20, an autorotation restraining component 25 for fully restraining the rotation of the swirling spiral blade component 11 is disposed, which has 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 filler port 29 of the crankshaft 5 opens into this lubricating oil.

The lubricating oil passes through the oil supply hole 30, oil supply groove 31, and through oil hole 32 of the crankshaft 5, from the oil groove 33 provided in the swing drive bearing 23, through the oil groove 34 provided in the thrust bearing 20, and then to the first main shaft 2.
The lubricant oil passes through the oil groove on the bearing part 1 and is exhausted from the lubricating oil well port 35 provided in the bearing parts 19t.

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. Lubricating oil is supplied to the compression chamber 14.

Problems to be Solved by the Invention However, in the conventional configuration described above, lubricating oil is not actively supplied to the compression mechanism 4, and there are problems such as a decrease in efficiency due to leakage of compressed refrigerant or seizure of the compression mechanism 4. Ta.

How to solve the above problems? The technical means of the present invention to solve the problem is to arrange an automatic restraining part having a structure in which key grooves or keys are provided on both sides of an annular body on the outside of the thrust bearing that supports the rotating spiral blade part in the axial direction, and to An expansion space is formed between the outer periphery of the thrust bearing, the inner side of the annular body, the plane of the swivel vane bearing, and the plane of the bearing parts, and the average distance between the outer periphery of the thrust bearing and the inner surface of the annular body is greater than the distance in the reciprocating direction of the annular body. The distance in the direction perpendicular to the reciprocating direction is made small, and a lubrication oil supply circuit that does not communicate with the expansion space is provided on the bearing plane of the thrust bearing or inside the thrust bearing, and the swivel vane +1ir
b. Oil supply depressions are provided in the receiving plane at positions where the oil supply depressions open alternately into the lubrication oil supply circuit and the expansion and contraction space according to the reciprocating motion of the annular body, and the oil supply depressions are provided in the vicinity of the outer periphery of the blade of the swirling spiral vane component and the expansion and contraction space. It is to provide an oil supply hole that opens and communicates with the.

Effects The effects of the technical means of the present invention are as follows.0 The oil supply recess provided in the plane of the swing vane bearing carries out a certain amount of lubricating oil from the entire lubrication oil supply circuit to the intermediate space for each revolution of the compressor. Due to the mediating action of the expansion and contraction space, the lubricating oil carried out to the expansion and contraction space is supplied to the outer periphery of the swirling spiral vane, that is, to the position immediately before compression begins.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3 of the accompanying drawings. Here, the same reference numerals are given to the same parts as in the conventional example, and the description thereof will be omitted.

In the figure, the outer circumferential shape of the thrust bearing 20 is a perfect circle, and the rotation restraint component 25a disposed on the outside thereof reciprocates in the direction of the key 27a, that is, in the direction of arrow A. As shown in FIG. 3, the inner diameter of the annular body 26a of the rotation restraint component 25a is set in the direction of the arrow B perpendicular to the direction of the arrow A, as shown in FIG.
It is formed so that the direction is small.

Further, the annular body 26a has a thickness such that it can freely move with an extremely small gap between the rotating spiral blade component 110 and the blade bearing plane 4 (1-11ib plane 41).

Due to these dimensions, F: tl: structure, thrust bearing 20
The outer circumference of the annular body 26a, the inner diameter of the annular body 26a, and the vane bearing planes 4° and 1I
A closed space surrounded by IIt and the bearing part plane 41 of the receiving part 19111 forms a pair of substantially closed expansion/contraction spaces 42.43 whose volumes expand and contract alternately with the reciprocating movement of the rotation restraint part 25a.

The lubricating oil supply circuit is in contact with the vane bearing plane 40 at a thrust oil supply groove 44 provided inside the thrust bearing 2o and on the bearing plane.

On the vane bearing plane 40, there are rotating spiral vane parts 11 (7) slugs, 2. ) Lubrication recesses 45 are provided at positions such that they open alternately into the thrust oil groove 44 and the expansion/contraction space 42 or 43 due to the pivoting movement relative to the bearing 20.

In addition, the mirror plate 13 includes a telescopic space 42 or 43 and a spiral blade 1.
An oil supply hole 46 that opens near the outer periphery of the second side is provided.

FIG. 4 shows another embodiment of the present invention, showing an oil supply hole 46b.

46c is provided on the end plate 13 of the above embodiment, the annular body 2
2 or provided on the bearing component 19.

Effects of the Invention According to the present invention, - A constant volume of lubricating oil is taken out from the lubricating oil supply circuit per revolution, and the lubricating oil can be reliably supplied to the position immediately before compression starts, so that the leakage gap in the compression chamber can be sealed. The lubricating oil required for the compressor is reliably supplied regardless of the compressor's rotational speed, suction and discharge pressures, and in excess or deficiency.Moreover, there is no need to add any extra parts, making the scroll type highly efficient at an extremely low cost. compressor can be realized.

[Brief explanation of drawings]

Is Figure 1 an embodiment of the present invention? FIGS. 2(a) and 2(b) are an exploded perspective view of the Na pressure structure and a perspective view of the rotating spiral blade parts of the compressor, respectively, and FIG. 3 is a longitudinal cross-sectional view of the scroll compressor shown in FIG. 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 longitudinal sectional view of a scroll compressor showing a conventional example. 1... Airtight container, 4... Compression mechanism, 8
... Fixed spiral blade parts, 9 ... Spiral blades, 10 ... End plate, 11 ... Rotating spiral blade parts, 12 ... Spiral blades, 13 ...・Mirror plate, 14・
...Compression chamber, 19...Bearing, 20...
...Thrust bearing, 25a...Rotation restraint parts,
26a... Annular body, 27a... Oh,
4o...Blade bearing plane, 41...Bearing parts plane, 42.4G...Expansion space, 44...
...Thrust oil groove, 46/46a/46c/old/
・Name of refueling hole agent: Patent attorney Toshio Nakao and one other person
j /-11 Basan An 1 Figure 5

Claims (1)

[Claims] A fixed spiral vane component and a rotating spiral vane component that provide spiral vanes on one surface of each end plate and combine the vanes with each other to compress gas;
A crankshaft that swings and drives the swirling volute vane component, a bearing component that supports the main shaft of the crankshaft, and a force in the rotational axis direction due to the compression pressure applied to the vortexing volute vane component on the opposite side of the end plate from the vane. A scroll-type compression mechanism is provided, which includes a thrust bearing in contact with and supported by a rotating blade bearing plane located at the rotating blade part, and a rotation restraining part that restrains the rotation of the rotating spiral blade part, and the scroll compression mechanism has a rotation restraining part that restrains the rotation of the rotating spiral blade part. A restraint component is provided, the rotation restraint component is provided with keys or keyways on both sides of the annular body, and the distance between the inner surface of the annular body and the outer periphery of the thrust bearing is determined by the average distance in the reciprocating direction of the annular body. an expandable space surrounded by the inner surface of the annular body, the outer peripheral surface of the thrust bearing, the plane on the bearing component side, and the rotating vane bearing plane; constitutes,
A lubrication supply circuit that does not communicate with the expansion space is opened on the bearing plane of the thrust bearing or inside the thrust bearing, a lubrication recess is provided in the swirling vane bearing plane, and the position of the lubrication recess is adjusted according to the reciprocating motion of the annular body. and providing oil supply holes which are alternately opened to the opening surface of the lubrication oil supply circuit and the expansion space, and further open to the vicinity of the outer periphery of the blade of the swirling spiral blade component and the expansion space and communicate with each other. scroll compressor.