JPH0286971A - Oil feeder for compressor - Google Patents

Abstract

PURPOSE:To aim at the relief of working manhour and the simplification of assembling work as well as the promotion of low-unit cost of production by having an oil pickup, solidly forming a paddle inside by means of injection molding of metal, pressed in an oil hole of a turning shaft. CONSTITUTION:A compressor part 3 and a motor part 4 driving this compressor part are housed in a closed case 2 stored with lubricating oil on a bottom part, and both these elements 3, 4 are connected to each other by a turning shaft 5. In an enclosed compressor 1 mentioned above, an oil hole 6 is formed in the axial direction of this turning shaft 5. On the other hand, there is provided with an inverted-conical oil pickup 7 which solidly formed a flat paddle 8 inside by means of injection molding of metal. Then, this pickup 7 is pressed in and locked to the oil hole 6 of the turning shaft 5 so as to cause the tip end to be dipped in oil. With this constitution, working manhour is abated as improving oiling action, while the pickup is formly installed in the turning shaft by only its pressing in the oil hole.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an oil supply device for a compressor used in refrigerators, showcases, and the like.

(b) Conventional technology Conventionally, this type of compressor oil supply system was used, for example, in
As disclosed in Japanese Patent No. 15270, etc., it is composed of a cylindrical oil pickup formed by press-drawing an iron plate or iron pipe, and a paddle formed by cutting and bending a thin sheet metal. The paddle was inserted and held in the oil pickup by its own expanding elastic force, and was press-fitted and fixed into the oil hole of the rotating shaft. By allowing the lubricating oil to rise along the slope of the paddle and the constriction surface of the oil pickup, the centrifugal pump action of the rotating shaft was enhanced and the lubrication characteristics were improved.

(c) Problems to be Solved by the Invention However, according to the above configuration, the paddle and the oil pickup must be formed separately and assembled.
There was a problem in that it required many man-hours and increased costs.

As a solution to this problem,
As disclosed in Japanese Patent Application Publication No. 2003-120029, a system in which a paddle and an oil pickup are integrally formed from a synthetic resin material has already been proposed. With this configuration, the work required to assemble the paddle and the oil pickup is not required, so the number of work steps can be reduced.

However, synthetic resin oil pickups suffer from thermal creep due to the high heat generated during compressor operation, so when installing them on the rotating shaft, they cannot be held in place by simply pressing them into the oil hole; Alternatively, it is necessary to fix the spring by machining a locking groove on the outer circumferential surface of the rotating shaft, which results in an increase in the number of parts and the number of man-hours, leading to an increase in cost.

The present invention was developed in view of the above, and an object of the present invention is to provide a compressor oil supply device that can reduce the number of machining steps, is easy to assemble, and is inexpensive.

(d) Means for Solving the Problems The present invention houses a compressor section and an electric motor section for driving the compressor section in a container in which lubricating oil is stored at the bottom, and connects these two sections with a rotating shaft. , and an oil pickup is installed in the oil hole of the rotating shaft to increase the action of the centrifugal pump by immersing its tip in oil, and the oil pickup has a paddle integrally formed inside by metal injection molding. and is configured to be press-fitted into the oil hole of the rotating shaft.

(f) Function The oil supply device for a compressor of the present invention has the above-described configuration, and since the oil pickup is integrally formed with a paddle, it is possible not only to increase the oil rising effect and reduce the number of work hours, but also to make the oil pickup made of metal. Therefore, the pickup can be firmly attached to the rotating shaft simply by press-fitting it into the shaft hole, eliminating the need for separate fixing devices such as springs, improving assembly workability, and reducing manufacturing costs. It is.

(f) Example Embodiments of the present invention will be described below based on the drawings.

1 is a hermetic compressor in which a compressor section 3 and an electric motor section 4 for driving the compressor section 3 are housed in a closed case 2 in which lubricating oil is stored at the bottom, and these two sections 3 and 4 are connected by a rotating shaft 5. It is. 6 is an oil hole formed in the axial direction of the rotating shaft 5. Reference numeral 7 designates an inverted conical oil pickup having a flat paddle 8 integrally formed inside thereof by metal injection molding. This pickup is press-fitted into an oil hole 6 of the rotary shaft 5 so that its tip is immersed in oil. Here, a method for manufacturing the oil pickup 7 will be briefly explained below. First, metal powder such as iron or stainless steel is mixed with a binder and heated and kneaded to form pellets into pellets. Next, this is injection molded into a predetermined shape. Thereafter, the oil pickup 7 having the paddle 8 integrally is completed by performing heat treatment such as degreasing to remove the binder and baking.

In the compressor oil supply system configured as described above, since the oil pickup 7 is integrally formed with the paddle 8 by injection molding of metal, the oil pickup 7 of the paddle 8
This eliminates the need to assemble the paddle to the rotary shaft 5, and the number of man-hours can be reduced while increasing the oil rising action of the rotating shaft 5. In addition, since the oil pickup 7 is made of metal, it can be firmly attached to the rotating shaft 5 simply by press-fitting the pickup into the shaft hole 6, and when the oil pickup 7 is attached, separate fixings such as springs are avoided. This eliminates the need for assembly, making assembly work easier and reducing manufacturing costs.

(G) Effects of the Invention As described above, according to the present invention, it is possible to provide a compressor oil supply device that can reduce the number of processing steps, is easy to assemble, and is inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the hermetic compressor, FIG. 2 is a sectional view of essential parts of the oil supply device, and FIG. 3 is a sectional view taken along section AA' in FIG. 2. 5... Rotating shaft, 6... Oil hole, 7... Oil pickup, 8... Paddle.

Claims (1)

[Claims] (1) A compressor unit and an electric motor unit that drives the compressor unit are housed in a container with lubricating oil stored at the bottom, and these two units are connected by a rotating shaft, and the oil hole of this rotating shaft is The oil pickup is equipped with an oil pickup whose tip is immersed in oil to enhance the action of the centrifugal pump, and the oil pickup has a paddle integrally formed inside by injection molding of metal, and is press-fitted into the oil hole of the rotating shaft. A compressor oil supply device characterized by: