JPS6244108B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary shaft oil supply pump structure used in a completely hermetic electric compressor, etc., and is stable by avoiding the accumulation of gas mixed in lubricating oil in the bearing and the phenomenon of oil film shortage. This invention relates to a rotating shaft structure that efficiently forms gas vent holes for the purpose of achieving high sliding performance.

An example of a conventional rotary shaft and compressor structure is shown in FIG.

That is, the compressor body 1 is housed in an airtight container 2, with a frame 3 as the core, an electric motor 4 at the bottom, and a compression mechanism section 5 at the top. are connected by. A main shaft portion 6a of the rotating shaft 6 is inserted into the main bearing portion 3a of the frame 3, and an outer diameter portion of the main shaft portion 6a passing through the main bearing portion 3a is connected to the rotor 4a of the electric motor 4.
The rotor 4a is directly connected to the rotating shaft 6. A balance weight 6d having a thrust surface 6c that slides on the thrust surface 3b of the frame 3 is formed directly above the frame 3 of the rotating shaft 6, and an eccentric shaft 6e is formed above the balance weight 6d.
The eccentric shaft 6e is a slider 5 that constitutes the compression mechanism section 5.
a Fits with the inner diameter. The lower end side of the rotating shaft 6 is immersed to a desired depth in lubricating oil sealed in a sealed container 2, and as the rotating shaft 6 rotates, the lubricating oil 7 is applied to the shaft portions 6a, 6b and eccentrically as shown by the arrows. An inclined hole 6f formed on the inner diameter or outer diameter of the shaft 6e, and a horizontal oil hole 6
g, the spiral groove 6h, the vertical hole 6i, etc., and is supplied to each sliding part. 6j is a gas vent hole, and when the lubricating oil 7 is sucked up by centrifugal force due to the action of the inclined hole 6f, the gas mixed in the lubricating oil 7 enters the main bearing 3a etc., and the gas vent hole 6j causes the oil film to run out, etc. This is to prevent the occurrence of jamming and seizing accidents, and is intended to quickly remove gas from the lubricating flow path system. At the same time as the oil hole 6g (hereinafter referred to as lateral hole 6g) in the same direction, a gas vent hole 6j is drilled in advance in a form that penetrates the shaft outer diameter at right angles to the shaft center, and then a bushing 6k is drilled in the eccentric side opening of the inclined hole 6f. This structure prevents the lubricating oil 7 from scattering when it is loaded with centrifugal force. The purpose of the tapered conical shape at the tip of the rotating shaft 6 is to prevent as much as possible the rippling phenomenon caused by the viscous action between the outer circumference of the rotating shaft and the lubricating oil 7, and to improve oil supply efficiency. It is.

According to the structure of the rotating shaft 6, the gas vent hole 6j
Since the construction method requires joining the bush 6k, in order to ensure the driving accuracy required for fastening between the outer diameter of the bush 6k and the hole 6j, the accuracy of the outer diameter of the bush and the accuracy of the inner diameter of the gas vent hole 6j must be adjusted. It is necessary to improve the precision of the parts, which results in an increase in the number of parts, an increase in the number of machining operations, and an increase in management costs.

In addition, it naturally requires 6k bushing work,
There are problems such as deformation of the rotating shaft 6 due to driving.

The present invention aims to eliminate the drawbacks caused by such conventional rotary shaft structures, and to obtain a more efficient degassing effect by combining the minimum necessary components of the compression mechanism and devising the shape of the degassing hole. It is something. That is, by making the gas vent hole a tapered hole perpendicular to the axis, one opening is opened to the lower part of the motor rotor, and the other opening is sealed with the rotor's inner diameter surface, thereby reducing the slope gap by centrifugal force. The present invention relates to a structure of an oil supply pump that prevents rising lubricating oil from scattering.

An example of the present invention will be explained below with reference to FIG.

Reference numeral 11 denotes a rotating shaft, and the lower end side of the rotating shaft 11 has an inclined hole 11a that applies centrifugal force and lift force to the lubricating oil 7 as the rotating shaft 11 rotates, similar to conventional rotating shafts.
is bored, and the upper part of the inclined hole 11a is a spiral groove 1 formed in the outer diameter part of the main shaft part 11b of the rotating shaft 11.
It communicates with a horizontal hole 11d that is perpendicular to the center of the rotating shaft connected to 1c. 11e is an eccentric shaft, a vertical hole 11f is bored from the upper part of the eccentric shaft 11e, and the lower end of the vertical hole 11f reaches a horizontal hole 11d that connects with the upper part of the spiral groove 11c that reaches the lower part of the balance weight 11g. Eccentric shaft 11 on the outer diameter
e Spiral groove 11c and horizontal hole 11 leading to the upper end surface
d is provided, and as a result, an oil supply path for the lubricating oil 7 is formed as shown by the arrow. 11h is a gas vent hole, and the eccentric side of the inclined hole 11a is the small diameter side 11i, and the opposite side is the large diameter side 11i.
The small diameter side 11i is sealed with the inner diameter surface of the rotor 4a to prevent scattering of the lubricating oil loaded with centrifugal force, and the small diameter side 11i is A portion of the side 11j is partially exposed at the lower end surface of the joint of the rotor 4a, and serves as a gas outlet as shown by the broken line arrow.

The present invention as described above has a gas vent hole in a tapered shape and a part of one side thereof is opened so as to communicate with the outside of the rotating shaft, thereby making it possible to omit the separate bushing on the conventionally known rotating shaft shown in FIG. Improving parts accuracy due to the problem of increased number of points and bush driving work,
This solves various problems such as deformation of the rotating shaft.

However, due to the directionality of the gas vent hole,
Conventionally, the straight-shaped gas vent hole on the rotating shaft can be drilled from the same direction at the same time as other horizontal holes, but the hole must be drilled from the opposite direction, and in the worst case, the hole must be drilled in a separate process, but the hole accuracy is high. Compared to conventional rotary shafts, the practical effects of the present invention are great because it does not require any mechanical strength or use a bushing.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an example of a conventionally known compressor and rotating shaft structure, and FIG. 2 is a side sectional view showing an embodiment of the present invention. 11... Rotating shaft, 11a... Inclined hole, 11b...
...Main shaft portion, 11c...Spiral groove, 11d...
Horizontal hole, 11e...Eccentric shaft, 11f...Vertical hole, 11
g...Balance weight, 11h...Gas vent hole, 11i...Small diameter side of gas vent hole 11h, 11
j...Large diameter side of the gas vent hole 11h.

Claims (1)

[Claims] 1. In a rotating shaft with an assembly structure in which the main shaft is inserted through the main bearing of the frame and the motor rotor is directly connected to the lower side of the main shaft extension, the main shaft is on the lower side and the eccentric part is on the upper side, at the lower end of the main shaft. The formation structure of the gas vent hole leading to the provided oil supply pump is such that a tapered hole whose center is perpendicular to the axis is opened so as to pass through the diameters of the rotating shafts and through the oil hole forming the oil supply pump, and A small diameter opening on the eccentric side of the oil hole is provided within the joint range of the rotor, and a part of the large diameter opening on the side opposite to the eccentricity of the oil hole is formed so as to be open at the lower part of the lower end surface of the rotor joint. A rotary shaft for a compressor.