JPS6226385A - Enclosed compressor - Google Patents

Abstract

PURPOSE:To prevent intrusion of spatter through the longitudinal hole of shaft to the sliding section thus to improve the reliability by inserting a hollow tubular member into the lateral hole of shaft while projecting the end section of hollow tubular member to the center of shaft. CONSTITUTION:A hollow tubular member 18 is inserted into a lateral hole 27b communicating between a longitudinal hole 27a made axially in the central portion at one end of shaft 27 and the outercircumference of shaft 27 and engaged with the shaft 27 while projecting the end section of said member 18 further to the center of axis than the inner wall face of the longitudinal hole 27a. Since the spatter 16 will flow together with the oil in the axial direction of shaft 27 along the inner wall of longitudinal hole 27a through the centrifugal force caused by rotation of shaft 27, the hollow tubular member 18 projecting further to the center of the axis of said shaft 27 than the inner wall face will block the spatter 16 from flowing over said member 18 and entering into the sliding section thus to discharge through an oil drain 27d together with excessive oil. Consequently, intrusion of foreign matter such as spatter to the sliding section can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a hermetic compressor, and particularly to a hermetic compressor suitable for improving the reliability of sliding parts.

[Background of the invention]

Case 1 is an explanation of the structure of a conventional compressor using Figure 4.
A compression element consisting of a frame 4, a shaft 7, a cylinder 8, a roller 9, a sub-bearing 10, etc., and a motor 6 are housed inside the case 1, and the case 1 is sealed with a lid 2 and a welded part 6, and the frame 4 is connected to the case and the welded part. This structure is connected by 5. Oil 15 is stored at the bottom of the case 1, and the lubricating oil 15 of the sliding part is
a from the suction piece 12 to the oil discharge boat 11. Oil supply pipe 14
a to the oil well 7a provided in the center of the shaft 7, and from the side hole 7b to the oil groove 7 provided on the outer circumference of the shaft.
C to lubricate the outer circumference of the shaft 7.

Here, the suction piece 12 has a tapered inner diameter and a nozzle shape, and has an extremely effective valve function because it sucks in the oil 15 and enables reliable oil supply.

However, the following points have not been considered in conventional compressors. That is, in the manufacturing process of compressors, as mentioned above, welding is not necessary, and electric welding is generally used. During welding, a large amount of hard metal spheres of several micrometers to several hundred micrometers, generally called spatter, are scattered. Some of the spatter 16 may enter the inside of the case 1, but some of the spatter 16 is sucked up into the sliding part along with the lubricating oil 15a, and as shown in FIG. The clearance of the sliding part from the vertical hole 7a to the horizontal hole 7b (generally around 10 micrometers) is quite small, and there is a risk that the spatter 16 will enter the clearance and damage the outer peripheral surface of the shaft 7, causing a locking accident. Conventionally, as a countermeasure against this problem, it is known to install a filter at the oil intake port, but it is difficult and expensive to manufacture a filter that can capture spatter smaller than about 10 microns and does not reduce the amount of oil supplied. Ta.

For example, Japanese Patent Application Laid-Open No. 59-218389 is related to this type of hermetic compressor.

[Purpose of the invention]

An object of the present invention is to provide a highly reliable compressor that prevents foreign matter from entering sliding parts.

[Summary of the invention]

This type of compressor generally has a vertical hole in the axial direction in the center of the shaft, and oil is guided from the vertical hole to the horizontal hole to lubricate the sliding parts. Since the spatter is moved along the inner wall of the vertical hole due to the centrifugal force of the rotation of the shaft, it is easily discharged from the horizontal hole to the sliding part. Therefore, a hollow cylindrical member is inserted into the horizontal hole, and one end of the hollow cylindrical member is inserted vertically into the inner wall surface, and the end of the hollow cylindrical member is made to protrude toward the shaft center to prevent spatter from being discharged from the vertical hole to the sliding part. It is.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a longitudinal sectional view of the compressor of the present invention. In the figure, a shaft 27 with a cylinder 8 and a crank inside a case 1, a frame 4 that also serves as a bearing for the shaft 27 and a side escape for the cylinder 8, a sub-bearing 10, a roller 9 fitted in the crank, and a groove in the cylinder 8. Slide the
The tip touches the roller 9 that rotates as the crank rotates,
A compression element formed by a vane 13 which is pushed by a spring 17 and reciprocated at the other end, a motor 6 and an oil 15 are housed, the case 1 and the lid 2 are sealed at a welded part 3, and a frame 4 is attached to the inner wall of the case 1. It is fixed by a welded part 5. The lubrication system is
The oil 15 is sucked in from the oil suction piece 12 by the pumping action of the reciprocating movement of the vane 13, and then passes through the oil supply pipe 14a to the shaft 2.
A vertical hole 27H provided in the axial direction at the center of one end of
oil groove 2 through a horizontal hole 27b that communicates with the shaft outer circumference
7cK is supplied. To explain in detail with reference to FIG. 2, a hollow cylindrical member 18 is inserted into the horizontal hole 27b, and the shaft 27 is shaped such that the end of the hollow cylindrical member 18 protrudes toward the axial center side than the inner wall surface of the vertical hole 27a. It is locked to.

As described above, the spatter 16 is moved along the inner wall of the vertical hole 27H in the axial direction of the shaft (washed away by oil) due to the centrifugal force caused by the rotation of the shaft 27. Hollow cylindrical member 1
8, the spatter 16 is removed from the protruding hollow cylindrical member 1.
8, so it does not enter the sliding part, and as shown in Figure 1, the excess oil and oil drain hole 2.
7d.

FIG. 6 shows another embodiment of the compressor of the present invention.
1 hollow cylindrical members 18 are installed in the horizontal hole 27b, and the same effect is obtained. Further, although the above embodiment shows the structure of a so-called rotary compressor, similar effects can be expected with other types of compressors such as a reciprocating compressor. Although spatter during welding has been explained as an example of a cause of damage to the sliding parts of the compressor, the present invention can also be applied to other foreign substances such as cutting powder, grinding powder, wear powder, dust, and dirt. It has a similar effect.

〔Effect of the invention〕

According to the present invention, it is possible to effectively prevent foreign substances such as spatter, cutting powder, and dust from entering the sliding parts together with lubricating oil, and this is made possible with a simple structure, thereby improving the reliability of the compressor. There is an effect that it can be done.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a compressor according to the present invention, Fig. 2 is a sectional view of a shaft of the invention, Fig. 5 is a longitudinal sectional view showing another embodiment of the invention, and Fig. 4 is a conventional compressor. A vertical sectional view of the machine, FIG. 5 is a sectional view of a conventional shaft. 1...Case, 2...Lid, 6...Welded part, 4...
・Frame, 5... Welding part, 6... Motor, 7...
・Shaft, 7a...Vertical hole, 7b...Horizontal hole, 7C・
...Oil groove, 7d...Oil drain hole, 8...Cylinder,
9...Rotor, 10...Sub bearing, 12...
・Oil suction piece, 14a...Oil supply pipe, 15...Oil,
15a...Lubricating oil, 16...Spatter, 17...
Spring, 18...Hollow cylindrical member, 27...Shaft of the present invention, 27a...Vertical hole, 27b...Horizontal hole, 27C
...Oil groove, 27d...Oil drain hole. $+(21 $2(21 $4 figure $5 figure

Claims (1)

[Claims] A hermetic compressor comprising a shaft housed in a case, a vertical hole provided in the axial direction in the center of the shaft, and a horizontal hole provided in the upper vertical hole so as to communicate between the inside and outside of the shaft, A hermetic compressor, characterized in that a hollow cylindrical member is inserted into the horizontal hole, and one end of the cylindrical member protrudes beyond an inner wall surface of the vertical hole.