JPS61155666A - Refrigerant compressor - Google Patents

Abstract

PURPOSE:To reduce dynamic loss of a compressor by forcing the internal face of an oil pump to make close contact with the external face of a crankshaft at the lower end thereof and bending the entire upper edge part of the oil pump in the reversed-L form. CONSTITUTION:The internal face of an oil pump 7 is forced to make close contact with the external face of a crankshaft 6 at the lower end thereof and the entire upper edge part of the oil pump 7 is bent externally in the reversed-L form 7a. When the oil pump 7 is turned, oil stuck to the external wall 7c of the oil pump 7 is forced upward by the centrifugal force, however, the oil is scattered in the directions as shown by the arrows from the bent part 7a of the reversed-L form. Lubricating face is thereby cooled and friction loss be reduced. In addition, oil which is scattered from the part 7a of the reversed-L form will not be stuck to rotors 3a and 3b. A compressor can obtain advantages of a low dynamic loss and a long life.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to refrigerant compressors used in refrigerators, air conditioners, etc., and particularly to lubricating oil pumps.

2. Description of the Related Art A conventional refrigerant compressor is disclosed, for example, in Japanese Patent Publication No. 59-93978. As shown in Fig. 3, refrigerating machine oil f is stored at the bottom of the airtight case e of the compressor, and the rotor d of the electric motor and the crankshaft rotating in one body,
Oil pump b inserted and fixed into the circular diameter hole a1 of the crankshaft
Problems to be Solved by the Invention However, in the above configuration, since the oil pump b is inserted and fixed into the circular diameter hole a1 of the crankshaft a, the circular diameter of the oil pump is It is small and has a low oil supply. On the other hand, when the oil pump rotates, the oil around the oil pump swells up as shown by trajectory C and often hits the rotor d of the electric motor, which causes disadvantages such as increased oil resistance and compressor loss. It had

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a compressor that can supply a large amount of oil, has a small power loss in the two compressors, and has a long life.

Means for Solving the Problems In order to achieve this object, the present invention fixes the circular diameter of the oil pump to the outer diameter of the lower end of the crankshaft, and bends the upper end of the oil pump outward.

Function: With this configuration, a large amount of oil can be supplied, and the power loss of the compressor can be reduced, resulting in a long service life.

Embodiment Hereinafter, one embodiment of the present invention will be described with reference to all the attached drawings. 1st
In FIGS. 2 to 2, reference numeral 2 denotes a sealed case in which an electric motor 3, a pressure i mechanism 4, and lubricating oil 6 are housed. 6 is a crankshaft, and the compression mechanism 4 is connected to the eccentric part of the crankshaft.
The rotor is press-fitted into the rotor 3a of the electric motor 3, and has an oil supply passage 6a and a gas vent hole 6b inside. Reference numeral 7 denotes an oil pump, the circular diameter of which is press-fitted and fixed to the outer diameter of the crankshaft 6. The upper end of the oil pump 7 is bent outwardly in an inverted shape 7a over the entire circumference. yd is the oil inlet hole.

The bending position is also below the lower end 3b of the rotor 3a. A separator 8 is inserted into the oil pump 7.

In the above configuration, when the electric motor 3 is energized, the rotor 3a of the electric motor, the crankshaft 6, the oil pump 7, and the separator 8 rotate, and the oil is pushed upward by the centrifugal force caused by the rotation of the oil pump 7.

The oil on the inner wall 7b of the oil pump 7 is pressed against the inner wall by centrifugal force, is prevented from slipping on the inner wall by the separator 8, and is pushed up into the oil supply hole 6a of the crankshaft 6.

In general, the characteristics of an oil pump are H-ax= (-2-;!2-
It is expressed as 1t[X1') ω f.

Hma is the maximum value of the water head (cm), g is the gravitational acceleration (cnv'5lIC), and I2 is the radius of the maximum diameter of the pump (α).

I, is the radius of the pump diameter (ω), and ω is the angular acceleration of the oil (
raa/5ec2).

As in the present invention, if the diameter of the oil pump is inserted and fixed to the outside diameter of the crankshaft, the radius of the maximum diameter of the pump of I2 can be expanded,
Hma with the influence of 2 squared! It is clear that the characteristics are improved because it is beneficial to the user. In this way, H-work a! improves oil supply amount.

Reference numeral 6b is a gas vent hole through which gas separated from oil by the rotation of the oil pump is removed, and oil without gas is supplied.

On the other hand, the oil on the outer wall 7C of the oil pump 7 swells upward due to the centrifugal force caused by the rotating shaft, but is blown away in the direction of the arrow by the above-mentioned inverted bend 7a. A high water head and a large amount of oil supply means that fresh oil is continuously supplied to the lubricated surface, which cools the lubricated surface and reduces friction loss. In addition, the oil is blown off by the inverted bend 7a and does not hit the rotors 3a, 3b.

Therefore, effects such as less power loss and a longer life of the compressor can be obtained.

Effects of the Invention As is clear from the above explanation, the present invention involves press-fitting and fixing the circular diameter of the oil pump to the lower end of the outer diameter of the crankshaft, and at the same time, bending the upper end of the oil pump in an inverted shape over the entire circumference. As a result, the power loss of the compressor is small and the life of the compressor is long.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a compressor of the present invention, FIG. 2 is a perspective view of an oil pump, and FIG. 3 is a sectional view of a conventional compressor. Oil e...Crankshaft, 6a...Crankshaft feeding hole, 7...Oil pump, 7a...
・Inverted bend of oil pump, 7d...Oil inlet hole of oil pump. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure Mt.

Claims (1)

[Claims] This refrigerant consists of a crankshaft with an oil supply passage inside, an oil pump with an oil inlet hole at one end and an inverted L-shaped bend at the other end, and the diameter of the oil pump is fixed to the outside diameter of the end of the crankshaft. compressor.