JPH0458089A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent both an oscillation bearing and a slider sleeve from being damaged due to the deflection of an eccentric shaft section by engaging the slider sleeve with the eccentric shaft section of a main shaft in such a way as to be monolithically rotated so as to be fitted, and thereby providing a cut-off section for the lower half section of the outer circumference of the eccentric shaft section at the side which is subjected to force from the oscillation scroll side. CONSTITUTION:The outer circumference of an eccentric shaft section 9a is provided with a cut-out section 9d for its lower half section at the side which is subjected to force from the side of an oscillation scroll 2. The points of application of force from the oscillation scroll 2 and the reaction of the eccentric shaft section 9a are made to coincide with the points of application of an oscillation bearing 11, a slider sleeve 27 and the eccentric shaft section 9a in respective contact surfaces. By this constitution, the condition between the oscillation bearing 11 and the slider sleeve 27 is a surface contact, both of them can thereby be prevented from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scroll compressor used in an air compressor, a refrigerant compressor, etc., and particularly relates to prevention of damage to a swing bearing portion.

[Conventional technology]

FIG. 4 is a longitudinal sectional view of a conventional scroll compressor. A spiral protrusion 1a is taken out from the base plate 1b of the fixed Suflow/L/1, and a spiral protrusion 2a is taken out from the base plate 2b of the oscillating Suflow/L/2.
is produced, and both spiral protrusions are 1800 degrees out of phase. 2c is a boss portion projecting downward from the base plate 2b, 4 is a discharge port, and 5 is both spiral protrusions 15L.

2a is a compression chamber formed in the dark, 6 is an upper bracket, fix the fixed scroll 1 to the upper part with bolt 7,
An intake gas passage 65L is provided. Reference numeral 8 denotes an upper suspension bearing fixed to the bracket 6 and supporting the swinging scroll 2 from below, and is made of a bearing material, but in the case of a small capacity, a metal plate with a coefficient of friction of /j% is used.

Reference numeral 9 denotes a main shaft, and an eccentric shaft portion 9a is provided at the upper end eccentrically from the shaft center, and is connected to the main shaft through a swing bearing 11 fixed to the boss portion 2c.
A rocking motion is given to the rocking unit 2. The main shaft 9 is penetrated with an oil supply hole 9b.

Reference numeral 10 denotes an electric motor, which is composed of a rotor 10a and a stator 10b fixed to a main shaft 9. The main shaft 9 is supported in the radial direction by an upper bearing 13 fixed to the seam 1 and a bearing 14 fixed to the lower bracket 2, and is supported from below by a lower fastening bearing 15. The lower thrust bearing 15 is made of a bearing material, but in the case of a small capacity, a metal plate with a small coefficient of friction or the lower bracket 12 itself is used. 16 is an oil pump attached to the lower end of the main shaft 9, l'
Reference numeral 7 denotes an Oldham joint which is interposed between the upper bracket 6 and the swinging flow/I/2 and prevents the swinging neck/I/20 from rotating and guides its swinging motion.

18 is middle shell/L/19 with upper shell 20 and lower shell, v2
1 and are hermetically joined together by welding.

A bracket 6.12 is fixed to the inner shell/L-' 19 by hair length, press fit, shrinkage fit, etc., and the stator 10b is fixed by a shrinkage spring. The upper shell 20 has a muff portion 25 formed in the space of the fixed scroll 20, and a discharge pipe 22 is airtightly fixed thereto. The suction pipe 23 and the terminal portion 24 of the lead of the electric motor 10 are hermetically fixed to the inner shell/I/19. Lubricating oil 26 is stored in the lower shell/L/21.

In the conventional scroll compressor described above, when the electric motor 10 is started, the eccentric rotation of the eccentric shaft portion 9a due to the rotation of the main shaft 9 causes the swinging flow /I/2 to swing through the boss portion 2c. As a result, the low-pressure gas from the suction pipe 23 is sucked into the compression chamber 5, and the compression chamber 5 moves to the center and gradually reduces its volume by VcM, converts it into high-pressure gas, and discharges it from the discharge port 4.
It is supplied to the outside through the discharge pipe 22. Further, a part of the suction gas from the suction pipe 23 flows around the outer circumference of the electric motor 10 and is cooled.

As the main shaft 9 rotates, the oil supply pump 16 pumps lubricating oil 26, raises the oil supply hole 9b, and lubricates each bearing.
The influence on the area will be explained using Figure 5.

The force Fg due to the gas pressure in the compression chamber 5 is the oscillating flow/L/2
It acts on the eccentric shaft portion 9a of the main shaft 9 at the point of action P from the boss portion 2c of the rotary bearing 11. For this reason, the eccentric shaft portion 9a
bends as shown in the figure and tries to support the force Fg at point Q.

In this way, a moment M2 is generated, and the swing bearing 11 and the eccentric shaft portion 9a come into point contact or #l contact at point Q.

In addition, as another example of a conventional scroll compressor, in order to appropriately adjust the contact position of the spiral protrusion of the oscillating scroll with respect to the spiral protrusion of the fixed scroll, a slider sleeve is fitted to the eccentric shaft portion of the main shaft. There is a means for making sliding contact with the inner periphery of a dynamic bearing and rotating it.

This is shown in FIG. On the outer circumference of the eccentric shaft portion 9a of the main shaft 9, two retaining plane portions 9c are formed that face each other in parallel. Reference numeral 27 denotes a slider sleeve whose inner periphery is fitted into the eccentric shaft portion 9a and has a pair of flat surfaces circumscribing each retaining flat surface portion 9c, and is rotated together with the rotation of the eccentric shaft portion 9a.

By adjusting the dimensions of this valve 270, the swinging distance of the swinging scroll 2 is adjusted, and the swinging distance of the swinging scroll 2 is adjusted, and the swinging distance of the swinging scroll 2 is adjusted, and the swinging distance of the swinging scroll 2 is adjusted.
The contact position of the spiral protrusion 2a of No. 2 is made appropriate.

In this way, even with the means provided with the slider sleeve 27,
The eccentric shaft portion 2a is deflected by the force Pg, a moment M2 is generated, and the swing bearing 11 and the Nufida sleeve 2F come into point contact or Fi line contact at point (2).

[Problem to be solved by the invention]

In the conventional scroll compressor as described above, the force Fg due to the gas pressure in the compression chamber 5 acts on the boss portion 2a of the swing neck/l/2, but the eccentric shaft portion 9a of the main shaft that receives Fg is deflected. , the lower end of the inner circumference of the swing bearing 11, and the swing shaft portion 9a
Alternatively, there is a problem that the lower end of the outer circumference of the slider sleeve 27 comes into point contact or line contact, which may cause abnormal wear or seizure.

This invention was made to solve these problems, and eliminates abnormal wear and seizure between the swing bearing of the swing flow and the swing bearing of the eccentric bearing of the main shaft.
The aim is to obtain a highly reliable scroll compressor.

[! ll! Means to solve the problem]

In the scroll compressor according to the present invention, a slider sleeve is fitted to the eccentric shaft of the main shaft so that they rotate together, and the outer periphery of the eccentric shaft has a side on which the force from the oscillating scroll is applied. A notch is provided downward from near the center of the height.

[Effect]

In this invention, the force from the oscillating scroll side, such as the gas force due to gas pressure, acts on the center of the height of the boss part of the oscillating scroll through the oscillating bearing, but the eccentric shaft of the main shaft receives the force oppositely. Since the points of action of both sides are aligned and received at the central part of the slider sleeve in the height direction, there is no surface contact between the rocking bearing and the slider sleeve, thereby eliminating damage to both.

〔Example〕

Figures Wc1 and 2 are a vertical cross-sectional view and a cross-sectional view of a rocking bearing and an eccentric shaft portion of a main shaft of a Nuclor compressor according to an embodiment of the present invention, and the configuration of other parts is the same as that of the above-mentioned conventional one. Fourth
It is the same as the one shown in the figure. In Fig. t
1 is fixed. The eccentric shaft portion 9a of the main shaft 9 is bent by the force Fg on the swinging scroll/I/2 side. At the circumferential portion of the eccentric shaft portion 9a, parallel and opposing retaining plane portions 9C are formed.

The slider sleeve 27 is fitted onto the eccentric shaft portion 9a thus formed, engaged in the circumferential direction, and rotated together. There is a small gap between the inner surface of the swing bearing 11 and the outer circumferential surface of the slider sleeve 2, which is so small that it does not hinder the formation of an oil film by the lubricating oil 26. A notch 9d is formed downward from near the center of the height.

A force Fg acts as a point of action P through the swing bearing 11 and the slider sleeve 27 at a position near the center of the height of the boss portion 2C. On the other hand, a reaction force Fr is generated with the point of action P being at a position near the center of the height of the swing bearing 9a, and both points of action coincide and no moment is generated. The slider sleeve 27 is received in line contact with the eccentric shaft portion 9a at the point of action P;
Since both rotate integrally and do not slide, no wear occurs.Furthermore, the slider sleeve 27 is in surface contact with the swing bearing 11 via an oil film, so no wear occurs.

Note that centrifugal force Fc is generated in the swinging scroll due to swinging motion, but this is received by the spiral protrusion 2a of the swinging scroll 2 coming into contact with the spiral protrusion 1a of the fixed scroll unit, and the eccentric shaft portion 9aK does not act. does not affect

FIG. 3 is a longitudinal sectional view of a swing bearing and an eccentric shaft portion showing another embodiment of the present invention. A notch 9e is provided on the outer circumference of the eccentric shaft portion 9a downward from a position near the center of the height on the side where the force Fg from the v2 side is applied, with a circular arc-shaped surface in the circumferential direction. , is in planar contact with the inner periphery of the slider sleeve 27. This increases the contact area and reduces the surface pressure caused by the force Fg, thereby preventing damage to both.

In addition, in the above embodiment, the lower side of the main shaft 9 is connected to the lower bearing 1.
4 and the lower thrust bearing 15 via the lower thrust bearing) 12
However, it may also be configured as follows. A main shaft in which the cylindrical part of the upper bracket 12 is extended downward, a lower bearing is fixed to this extended part, the middle part of the main shaft is supported, a large diameter part is provided on the upper side of the main shaft, and the main shaft is fixed to the upper bracket 12. The large diameter portion of the main shaft may be supported from below by a thrust bearing. In this case, the lower bracket 12 is omitted, and the middle shell /l/19 and the lower shell /1/2
It is made one with 1.

〔Effect of the invention〕

As described above, according to the present invention, the slider sleeve is engaged and fitted to the eccentric shaft portion of the main shaft so as to rotate together, and the outer periphery of the eccentric shaft portion is provided with a slider sleeve from the oscillating flow μ side. A notch is provided below from near the center of the height where the force acts, so that the point of application of the force from the oscillating scroll side, such as gas pressure, on the boss part and the reaction force of the eccentric shaft part. The points of action are aligned, damage to the swing bearing and slider sleeve due to deflection of the eccentric shaft is eliminated, the reliability of the swing bearing is improved, and the swing motion of the swing scroll is performed stably.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the swing bearing part and the eccentric shaft part of the main shaft of a Nuclor compressor according to an embodiment of the present invention during operation, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1. , 1!3 are longitudinal cross-sectional views of the oscillating bearing portion and eccentric shaft portion during operation, showing other embodiments of the present invention, FIG. 4 is a vertical cross-sectional view of a conventional scroll compressor, and FIG. 6 4 is a vertical cross-sectional view of the rocking details and the eccentric shaft in operation, and FIG. 6 is a vertical cross-sectional view of the rocking bearing and the eccentric shaft in operation, showing another conventional example. It is. 1...Fixed nucleus, Yua... Spiral projection, lb.
... Base plate, 2... Oscillating flow μ, 2a... Spiral protrusion, 2b... Base plate, 2c... Boss part, 4...
Discharge port, 5... Compression chamber, 9... Main shaft, 9a... Eccentric shaft portion, 9d, 9e... Notch portion, UO... Electric motor, 11... Rocking bearing, 27 ...Spida Sleeve O Note that the same reference numerals in the drawings indicate the same or equivalent parts.

Claims (1)

[Claims] A fixed scroll with spiral protrusions on one side of the base plate,
The spiral projection projected on one side of the base plate is combined with the spiral projection of the fixed scroll, and the compression chamber formed by swinging and turning is moved from the outer suction side to the center side, and the compressed fluid is pumped from the discharge port to the center. An oscillating scroll with a boss protruding from the center on the back of the base plate, an oscillating bearing fixed to the inner periphery of this boss, and an eccentric shaft eccentric from the shaft center at the top end. In the scroll compressor, the scroll compressor is provided with a main shaft rotated by an electric motor, and a slider sleeve that is fitted into the eccentric shaft portion and rotated integrally with it, contacts the inner periphery of the rocking bearing and transmits rocking motion. On the outer periphery of the eccentric shaft,
A notch is provided downward from near the center of the height on the side on which the force from the oscillating scroll side acts, and a oscillating bearing is formed to reduce the force from the oscillating scroll side and the reaction force of the eccentric shaft. A scroll compressor in which the points of action are matched between the mutual contact surfaces of the slider sleeve and the eccentric shaft.