JPH04262088A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent the damage of bearing sections by arranging a magnet at the lower section of an eccentric hole pivotally supporting a swaying shaft, and attracting metallic foreign objects. CONSTITUTION:An eccentric hole 3b is formed at the upper end section 3a of a main spindle 3, a magnet 17 is arranged between the bottom face of the eccentric hole 3b and the lower end face of a swaying bearing 4, and a space 18 is formed between the magnet 17 and a swaying shaft 2c. A lubricant is fed from an oil feed hole 3d and guided into the space 18. The centrifugal force is applied to ferrous foreign objects 22 in the space 18, and it is attracted to the magnet 17 and removed. The lubricant removed with the foreign objects 22 is fed to bearing sections from oil grooves 19, 20, 21, and the damage of the bearing sections is prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving the reliability of lubrication of scroll compressors used in refrigeration systems, air conditioners, etc.

0002

[Prior Art] FIG. 2 shows, for example, Japanese Patent Laid-Open No. 62-142888.
FIG. 2 is a sectional view showing the configuration of a conventional scroll compressor disclosed in the publication. In the figure, 1 is a fixed scroll equipped with a spiral projection 1a on one side of the end plate 1b, and 2 is a spiral projection 2.
A is provided on one side of the end plate 2b, and a oscillating scroll 3 is provided with a oscillating shaft 2c protruding from the other side of the end plate 2b. A main shaft 5, which has an eccentric hole 3b supported through the main shaft 3b and an oil supply hole 3d penetrating from the lower end 3c to the eccentric hole 3b, is an electric motor consisting of a motor rotor 5a and a motor stator 5b connected to the main shaft 3.

Reference numeral 6 denotes a shell constituting an airtight container, and 7 has an outer periphery fixed to the inner surface of the shell 6. The outer periphery of the upper surface supports the fixed scroll 1, and the center portion of the upper surface supports the oscillating scroll 2 via a thrust bearing 8. The upper bearing frame supports the end plate 2b of the main shaft 3 via the main bearing 9 in the center.
A through hole 7a is formed to support the outer periphery of the upper end 3a. Reference numeral 10 denotes an oil storage part formed at the lower part of the shell 6, and 11 has an inlet port 11a at its tip that is immersed in the oil storage part and opens. An oil cap is attached to cover the oil cap, 12 is a suction pipe, 13 is a discharge pipe, and 14 is a lower bearing frame whose outer periphery is fixed to the inner surface of the shell 6, supporting the main shaft 3 at the center and suspending the motor stator 5. , 15 and 16 are oil return passages formed in the upper bearing frame 7 and the lower bearing frame 14, respectively.

Next, the operation of the conventional scroll compressor configured as described above will be explained. First, when the motor rotor 5a rotates, the swinging scroll 2 is driven via the main shaft 3 and a compression operation is started. At this time, the working fluid is sucked in through the suction pipe 12, compressed within both scrolls 1 and 2, and then discharged from the discharge pipe 13 to the outside of the compressor, as shown by the solid arrow in the figure.

On the other hand, lubricating oil is supplied from the oil storage portion 10 to the suction port 11a and the oil supply hole of the oil cap 11 by the centrifugal pump action of the oil supply hole 3d formed in the main shaft 3 and the oil cap 11, as shown by the broken line arrow in the figure. 3d and reaches the eccentric hole 3b formed in the upper end 3a of the main shaft 3, and is further accelerated by centrifugal force and supplied to each bearing section for lubrication. The oil is returned to the oil storage section 10 through the

[0006]

[Problems to be Solved by the Invention] Since the conventional scroll compressor is constructed as described above, for example, metal powder carried from outside the compressor through the suction pipe 12 and sliding parts inside the compressor are Foreign matter in the lubricating oil, such as metal abrasion powder generated from the eccentric hole 3, which forms a pocket in the oil supply path
Since it accumulates in the lower part of the shaft and is then carried to each bearing, there is a problem in that it damages the shaft or the bearing and reduces reliability.

This invention was made to solve the above-mentioned problems, and by collecting foreign matter in the lubricating oil, it is possible to suppress the foreign matter from being carried to the bearing as much as possible.
The purpose is to obtain a highly reliable scroll compressor that does not damage bearings.

[0008]

[Means for Solving the Problems] A scroll compressor according to the present invention has a magnet disposed below an eccentric hole formed at the upper end of a main shaft and supporting an oscillating shaft of an oscillating scroll.

[0009]

[Operation] The magnet of the scroll compressor in this invention is
It adsorbs metallic foreign matter that accumulates at the bottom of the eccentric hole and prevents the metallic foreign matter from being carried to each bearing part.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the configuration of the main parts of a scroll compressor in an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2 are the same as those in the prior art in FIG. 2, so the explanation will be omitted. 17 fits into an eccentric hole 3b formed in the upper end 3a of the main shaft 3, and the bottom surface of the eccentric hole 3b and the swing bearing 4
A thin cylindrical magnet 18 held between the lower end surface of the magnet 18 is a space surrounded by the magnet 17 between the bottom surface of the eccentric hole 3b and the swing shaft 2c.

Reference numeral 19 denotes a first oil groove formed to axially penetrate the inner circumferential surface of the swing bearing 4, and 20 indicates a first oil groove formed on the outer circumferential surface of the upper end portion 3a of the main shaft 3, which is closed at the bottom and opened upward. A second oil groove 21 formed as shown in FIG.
The first oil groove 19 and the second oil groove radially penetrate the upper end 3a of the
The oil hole 21 is a third oil groove formed in the radial direction on the upper surface of the thrust bearing 8, and the inner diameter side is connected to the upper surface of the upper end 3a of the main shaft 3 and the end of the oscillating scroll 2. Board 2b
It communicates with the first and second oil grooves 19, 20 through a space formed by the lower surface of the oil groove, and the outer diameter side thereof communicates with an oil passage 15 for oil return. 22 is an iron-based foreign substance contained in the lubricating oil.

Next, the flow of lubricating oil in the main parts of the scroll compressor in one embodiment of the present invention constructed as described above will be explained. In the figure, dashed arrows indicate the flow of lubricating oil, and the lubricating oil in the oil storage section 10 is pumped up by the centrifugal pump action of the oil cap 11 and the oil supply hole 3d, and introduced into the space 18 through the oil supply hole 3d. Here, the lubricating oil is accelerated by the centrifugal force and collides with the wall of the magnet 17 arranged so as to surround the space 18. And magnet 17
Due to the magnetic force, the iron-based foreign matter 22 in the lubricating oil is attracted to the magnet 17 as shown in the figure and removed from the lubricating oil.

After that, the lubricating oil flows from the first oil groove 19 to the oil hole 2.
The oil lubricates each bearing portion along the path 1→second oil groove 20→third oil groove 21, and returns to the oil storage portion 10 through return oil passages 15 and 16. In this way, each bearing has a foreign object 22.
Since the lubricating oil from which the foreign matter 22 has been removed is supplied, the shaft and bearings will not be damaged by the foreign matter 22. In the above embodiment, a thin cylindrical magnet 17 has been described, but the shape is not limited to this in any way, and a shape that is easy to attach and has a large surface area is preferred.

[0014]

[Effects of the Invention] As described above, according to the present invention, since the magnet is placed at the bottom of the eccentric hole, the iron-based foreign matter contained in the lubricating oil is removed by adsorption, and the transport of foreign matter to the bearing is minimized. A highly reliable scroll compressor that does not damage the shaft or bearings can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the configuration of main parts of a scroll compressor in an embodiment of the present invention.

FIG. 2 is a sectional view showing the configuration of a conventional scroll compressor.

[Explanation of symbols]

2c Swing axis 3 Main shaft 3a Upper end 3b Eccentric hole 3d Oil supply hole 17 Magnet

Claims (1)

[Claims] Claim 1: Lubricating oil is introduced into the lower part of the eccentric hole formed at the upper end of the main shaft and supporting the swing shaft of the swing scroll through an oil supply hole that penetrates from the lower end of the main shaft to the eccentric hole. 1. A scroll compressor in which a magnet is disposed at a lower part of the eccentric hole in the scroll compressor configured to supply air to each bearing part.