JP2593278Y2 - Compressor oil pump - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an oil pump used in a compressor.

[0002]

2. Description of the Related Art As a conventional compressor, for example, there is a scroll compressor for a gas such as Freon shown in FIG.
As shown in the figure, a spiral wrap 2b is erected on a head plate 2a in the upper part of the closed container 1, and a discharge hole 2
c and a fixed scroll 2 having a suction hole 2d formed in a side wall.
Is fixed, a spiral wrap 3b is erected on one surface of the end plate 3a, and a shaft 3c is provided substantially at the center of the other surface.
The orbiting scroll 3 including the wrap is arranged eccentrically with the wrap so as to form a compression portion. A bearing base 4 positioned below and supporting the orbiting scroll 3 is integrated with a head plate 2a of the fixed scroll 2 by bolts or the like, and a drive bearing 4a is provided at the upper center so as to coincide with the center of the fixed scroll 2. A thrust bearing 4b is provided on the upper surface, and an oil return hole 4c is formed at an appropriate position. A drive shaft 5 integrated with a rotation shaft of a rotor 6a of a motor 6 as a drive unit
Is provided with an eccentric slewing bearing 5a at the upper part, the upper part is supported by the drive bearing 4a, and the lower end is supported by a lower drive bearing 7 fixed to the bottom of the closed casing 1. The orbiting scroll 3 has the shaft 3c supported by the orbiting bearing 5a, the lower surface of the end plate 3a supported by the thrust bearing 4b, and is engaged with the Oldham's joint 8 which is located between the bearing base 4 and prevents rotation. This joint has a pair of hanging pieces 8b on the lower surface of the annular body 8a.
Is provided so as to be slidably fitted in the groove 4d of the bearing base 4, and an upright piece orthogonal to the hanging piece 8b is provided on the upper surface to slide in a groove (both not shown) on the lower surface of the end plate 3a of the orbiting scroll 3. It is movably fitted. Balance weights 15 and 16 for canceling vibration when the drive shaft 5 rotates the orbiting scroll 3 eccentrically are mounted on the drive shaft 5 and the rotor 6a, respectively. A suction pipe 11 communicating with a discharge pipe 10 facing the suction pipe 9 and a suction hole 2d is attached. The bottom of the sealed container 1 is an oil reservoir 1
7 and the lubricating oil is stored. The lower end of the drive shaft 5 is located in the oil reservoir 17, the lower part of an oil hole 5b running vertically in the same axis is inclined to form a pump part, and the upper part is communicated with a swivel bearing 5a, and is branched and driven midway. It communicates with each bearing such as the bearing 4a.

Accordingly, when the motor 6 rotates, the drive shaft 5 integrated with the rotating shaft rotates, and the orbiting bearing 5a provided at the upper end thereof is eccentric, so that the orbiting scroll 3 moves circularly. And since it is engaged with the Oldham's joint 8, it does not rotate, and makes a turning motion while constantly making one point of each circle constituting the wrap almost contact the fixed scroll 2, and makes the contact point from the outer periphery to the center. Move continuously. As a result, the suction pipe 11 is
The gas flowing between the two scrolls via d is collected between the outermost wraps of approximately one turn, and compressed as the space volume decreases as it is sent to the center by rotation, and becomes high-pressure gas from the discharge hole 2c. It is discharged into the high-pressure chamber 9.

[0004] On the other hand, oil is supplied by pumping a lubricating oil from a sump 17 at the bottom of the sealed container 1 to a pump section formed below the drive shaft 5. That is, the lower inclined portion of the oil hole 5b running longitudinally in the drive shaft 5 operates as a pump that pushes up the lubricating oil by applying centrifugal force to the lubricating oil in this portion by coaxial rotation. Lubricate each communicating bearing. The lubricating oil supplied to the slewing bearing 5a and the drive bearing 4a flows out and supplies the thrust bearing 4b, further flows on the upper surface of the bearing base 4 and returns to the oil sump 17 through the oil return hole 4c, but a part of the oil is sucked. From 2 d, the gas is sucked by the rotary scroll 3 and reaches the space between the fixed scroll 2.

[0005] However, although the oil pump having the above structure is suitable for a large-sized machine, it has a drawback that a small-sized machine with a thin drive shaft cannot provide a sufficient amount of oil supply because sufficient centrifugal force cannot be applied to oil. is there.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a compressor oil pump suitable for a small machine.

[0007]

In order to solve the above-mentioned problems, in the present invention, a drive unit having a compression unit and a vertical drive shaft is housed in a closed container, and the bottom of the closed container is used as an oil reservoir. In the oil pump of the compressor, the drive shaft is extended in the oil reservoir, and an oil pump is formed at a lower portion of the drive shaft and oil is supplied to the compression unit through an oil supply hole provided in the same axis. The drive shaft accommodates a slinger with a lower portion as a hollow tube and is surrounded by a bottomed cylinder, and the bottomed cylinder is positioned below the oil level, and the slinger is formed by a torsion plate. At the same time, a slit is provided at the center of the lower end to divide it into two, and each is bent in the rotation direction of the drive shaft.

[0008]

[Function] Oil is pumped up by the pushing force of the slinger and the centrifugal force due to the rotation of the drive shaft.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an oil pump for a compressor according to the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of the present apparatus, and FIG. 2 is a view taken along the line AA in FIG. As shown in the figure, the bottom of the sealed container 1 serves as an oil reservoir 17 for storing lubricating oil, and the lower end of the drive shaft 5 extends into the oil reservoir 17. The drive shaft 5 is formed of a hollow tube, and a slinger 18 is press-fitted therein. The slinger 18 is formed by twisting, for example, a stainless steel plate having a width approximately equal to the diameter of the hollow portion, providing a slit 18a at the lower end, and bisecting each of them by, for example, 45 degrees in the rotation direction of the drive shaft 5. The lower end is located at the same level as or slightly below the lower end of the drive shaft 5. The lower portion of the drive shaft 5 is surrounded by a bottomed cylindrical body 19 with appropriate gaps on the side and lower surfaces. And bottomed cylinder 1
Numeral 9 is fixed to the sealed container 1 by a support fitting 20, and lubricating oil is sealed so that the bottomed cylinder 19 is below the oil level even during operation of the compressor.

Therefore, when the compressor is operated, the drive shaft 5 rotates, and the slinger 18 integrated therewith also rotates. Since the bent portion 18b at the lower end of the slinger 18 has an inclined surface in the moving direction, the oil that comes into contact with the bent portion 18b receives the upward force and rises in the torsional portion, and the drive shaft 5 is centrifugally driven. Adheres to the inner wall of The adhering oil is pushed further by the subsequent oil and moves further upward, reaches the upper end of the drive shaft 5 and refuels a predetermined location. Negative pressure is generated in the vicinity of the bent portion 18b due to upward movement of the oil. However, since an appropriate gap is provided between the drive shaft 5 and the bottomed cylindrical body 19, the drive shaft 5
The oil flows into the bottomed cylindrical body 19 without being affected by the oil layer moving with the surface of the oil tank, and the oil supply is continued. In addition, the gap also blocks the influence of the movement of the oil surface due to the fall of the return oil, bubbles, and the like.

[0011]

[Effects of the Invention] Since the drive shaft is hollow and a slinger is built in, and the slinger is surrounded by a bottomed cylinder and disposed below the oil level, it is possible to achieve an effect that oil can be supplied by a small-diameter drive shaft. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view of an oil pump of a compressor according to the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a sectional view of a conventional scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 5 Drive shaft 17 Oil reservoir 18 Slinger 18a Slit 18b Bent part 19 Bottomed cylinder 20 Support bracket

Claims (2)

(57) [Scope of request for utility model registration] 1. A drive unit having a compression unit and a vertical drive shaft is accommodated in a closed container, and the drive shaft is extended into the oil reservoir using the bottom of the closed container as an oil reservoir. In an oil pump of a compressor formed by forming an oil pump at the lower part of the compressor and feeding oil to the compressor through an oil feed hole provided in the same axis, the drive shaft accommodates a slinger with the lower part as a hollow tube , ~ side
It is surrounded by a bottomed cylinder that opens upward with an appropriate gap between the surface and the lower surface , and the open end of the bottomed cylinder accumulates in the oil reservoir.
Oil pump of the compressor, characterized by comprising located under meta oil level. 2. The slinger is formed of a torsion plate, and a slit is provided at the center of a lower end to divide the slinger into two, and each is bent in a rotation direction of a drive shaft. An oil pump for the compressor as described.