JPH05149285A - Oil feed pump device of compressor - Google Patents

Abstract

PURPOSE:To improve sliding characteristic of a thrust plate arranged below a pump rotor, prevent oil leakage from a pump chamber even in the case of upward movement of a drive shaft at starting and the like, and restrain deterioration in the pump efficiency. CONSTITUTION:A washer 4 provided with an annular closing plate part 41 to close the bottom part of a pump chamber 10 and a cylindrical part 42 at the center part, is arranged on the bottom part of the eccentric part 13 of a rotor 1, and the cylindrical part 42 is press-fitted to the outer circumference of a projecting part 17 having an oil suction port 14. A plurality of radial oil grooves 5 of triangular section are formed on the receiving face of a thrust plate 3, so as to feed oil to the thrust face and to be provided with an escape of iron powder. Further, a relatively large thrust receiving face decided by the outer diameter of the washer 4 is insured, and the washer 4 is moved upward following to the upward movement of a drive shaft 8, so as to prevent generation of a gap in the axial direction at the fitted area between the eccentric part 13 and a yoke 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a lower portion of a drive shaft in a compressor, and is configured to pump a fixed amount of oil per rotation, which corresponds to a volume of a pump chamber defined by a rotor and a yoke. Refueling pump device of machine.

[0002]

2. Description of the Related Art Conventionally, in this type of oil supply pump device, the amount of pumping oil per one rotation is constant and the amount of oil supply is almost proportional to the number of rotations. It is widely applied to a variable speed compressor such as an inverter as is known from Japanese Patent Publication No. 87993. As shown in FIG. 4, this conventional oil supply pump device has a boss portion V press-fitted into the lower portion of the drive shaft D, a flange portion F abutting against the lower end surface of the drive shaft D, and an eccentric portion eccentric to the drive shaft D. A rotor R in which E is integrated, a yoke Y which is fitted to the outer peripheral portion of the eccentric portion E to define a pump chamber C, and a thrust plate P which is arranged at the bottom of the eccentric portion E and receives a thrust load. An oil supply passage provided in the drive shaft D from the pump chamber C through the oil discharge passage H to introduce the oil taken in from the oil suction inlet J opening at the bottom of the eccentric portion E into the pump chamber C through the oil suction passage L. I try to pump up to T.

[0003]

However, in the above, since the bottom of the pump chamber C is closed by the thrust plate P, it is necessary to prevent oil leakage in the pump chamber C.
No oil groove can be provided on the receiving surface of the thrust plate P. Therefore, the lubrication condition on the sliding surface receiving the thrust load is poor, and there is a possibility that minute dust such as iron powder may be caught. Since the bottom surface of the rotor R makes sliding contact with the thrust plate P via a relatively narrow annular sliding surface determined by the outer diameter of the eccentric portion E, the sliding contact surface pressure is large.
There is a problem that it is difficult to obtain good sliding characteristics as a whole.

The rotor R is fixed to the drive shaft D by press fitting, but since the bottom of the pump chamber C is closed by the thrust plate P as described above, the drive shaft D is axially upper at the time of start-up. When it is displaced, there is also a problem that an axial gap is formed in the fitting portion between the eccentric portion E and the yoke Y, oil leaks from the pump chamber C, and the efficiency of the oil pump decreases.

A first object of the present invention is to provide an oil groove in the thrust plate without causing oil leakage from the pump chamber, to enlarge the thrust receiving surface, and to improve the oil supply condition. A second object of the present invention is to provide an oil supply pump device for a compressor. In addition, it is possible to prevent oil leakage from the pump chamber even when the drive shaft is moving upward, and to suppress deterioration of pump efficiency. An oil supply pump device for a compressor is provided.

[0006]

Therefore, first, in order to achieve the first object, an eccentric portion 13 fixed to the lower portion of the drive shaft 8 and having an eccentric center with respect to the drive shaft 8 is provided. The eccentric portion 13 is provided with a rotor 1 provided, a yoke 2 that is fitted to the outer peripheral portion of the eccentric portion 13 to define the pump chamber 10, and a thrust plate 3 that is disposed at the bottom of the eccentric portion 13. In an oil supply pump device for a compressor that pumps oil taken in from an oil intake port 14 that opens at the bottom of the oil pump to an oil supply passage 9 provided in the drive shaft 8 through the pump chamber 10, a bottom surface of the eccentric portion 13 and the thrust plate. Between the receiving surface of 3
An annular washer 4 that closes the bottom of the pump chamber 10.
The washer 4 is attached to the rotor 1 so as to rotate together, and an oil groove 5 is formed on the receiving surface of the thrust plate 3.

Secondly, in order to achieve the second object, in the first configuration, the oil intake port 14 is provided at the bottom of the eccentric portion 13.
The washer 4 is provided with a projecting portion 17 that opens downward, and a cylindrical portion 42 that fits into the outer peripheral portion of the projecting portion 17 by press fitting is provided at the center of the washer 4.

[0008]

With the above first means, the bottom of the pump chamber 10 is closed by the washer 4 that rotates with the rotor 1, so that the oil groove 5 can be provided on the receiving surface of the thrust plate 3.
By providing the oil groove 5 on the thrust plate 3 in this manner, the oil receiving state on the thrust receiving surface can be improved, and minute dust can be released by the oil groove 5, so that dust can be caught on the sliding surface. It is possible to prevent jamming. or,
Since the thrust load is received through the washer 4, the thrust receiving surface exceeds the outer diameter of the eccentric portion 13 and
The area can be expanded to a relatively large annular surface determined by the outer diameter dimension of the.

By pressing the tubular portion 42 of the washer 4 into the discharge portion 17 by the second means, the washer 4 is integrally coupled with the rotor 1 and the drive shaft 8 in the axial direction. Eccentric part 13 and yoke 2
There is no gap in the axial direction between the fitting portion and the fitting portion, and oil leakage from the pump chamber 10 can be prevented.

[0010]

1 shows a compressor having a casing 7 having an oil sump 6 at the bottom and a scroll type compression element (not shown) and a motor 80 in which the oil supply pump device of the present invention is incorporated. The boss portion 11 is press-fitted into the lower portion of the drive shaft 8 and the collar portion 12 is in contact with the lower end surface of the drive shaft 8.
And an eccentric portion 13 having an axis O that is eccentric to the axis S of the drive shaft 8 as shown in FIG.
Similarly, as clearly shown in FIG. 2, a yoke body that opens a slot 20 in which two semicircles are connected by a straight line portion in the central portion and is fitted to the outer peripheral portion of the eccentric portion 13 to define the pump chamber 10 21
And a yoke 2 in which the short-axis direction keys 22 and 22 that slide in the key grooves 72 and 72 provided in the lower housing 71 are integrated, and the yoke 2 is disposed at the bottom of the eccentric portion 13 and is provided at the bottom of the lower housing 71. The thrust plate 3 is fixed via bolts 31. Then, the oil taken in from the oil suction port 14 opening at the bottom of the eccentric portion 13 is introduced into the pump chamber 10 through the oil suction passage 15, and the oil supply provided on the drive shaft 8 through the oil discharge passage 16 from the pump chamber 10. Pump up to passage 9,
Oil is supplied to the lower bearing 81, the upper bearing provided on the upper side, the sliding surface of the compression element, and the like.

With the above construction, the washer 4 having the annular closing plate portion 41 for closing the bottom portion of the pump chamber 10 is disposed between the bottom surface of the eccentric portion 13 and the receiving surface of the thrust plate 3, and The washer 4 is attached to the rotor 1 so as to be able to rotate together, and a plurality of oil grooves 5 are formed on the receiving surface of the thrust plate 3 and are radial grooves having a triangular cross section as shown in FIG.

Further, in the above structure, the washer 4 is attached to the rotor 1
In order to make it rotate together with the washer 4, it can be joined by using an engaging means such as a key.
2 is projected, and the cylindrical portion 42 is integrally provided on the bottom portion of the eccentric portion 13 and is fitted into the outer peripheral portion of the projecting portion 17 that opens the oil suction port 14 downward by press fitting.

With the above construction, since the bottom portion of the pump chamber 10 is closed by the closing plate portion 41 of the washer 4, it is possible to provide the oil groove 5 on the receiving surface of the thrust plate 3, and in this way. By providing the oil groove 5 in the thrust plate 3, it is possible to improve the sliding characteristics on the thrust receiving surface, and it is possible to allow minute dust to escape by the oil groove 5, so that dust can be caught in the sliding surface. Can be prevented. Further, since the thrust load is received via the washer 4, the area of the thrust receiving surface can be expanded to a relatively large annular surface that exceeds the outer diameter of the eccentric portion 13 and is determined by the outer diameter of the washer 4. .. Therefore, the thrust load can be favorably supported as a whole, and the sliding characteristics thereof can be improved.

Further, the cylindrical portion 42 of the washer 4 is attached to the protruding portion 1
The washer 4 is fitted into the rotor 1 by press fitting it into the rotor 1.
Also, the drive shaft 8 and the drive shaft 8 are integrally coupled in the axial direction, so that even if the drive shaft 8 is displaced upward by an amount of play in the axial direction at the time of starting or the like, the fitting between the eccentric portion 13 and the yoke 2 is performed. There is no gap in the axial direction in the portion, oil can be prevented from leaking from the pump chamber 10, and it is possible to prevent deterioration of pump efficiency.

[0015]

As described above, according to the first aspect of the present invention, it is possible to improve the oil supply condition in the thrust plate 3, prevent dust from being caught in the sliding surface, and relatively reduce the thrust receiving surface. It is also possible to secure a large value, and it is possible to support a good thrust load as a whole and improve its sliding characteristics.

According to the invention of claim 2, further,
Even if the drive shaft 8 moves upward at the time of start-up, it is possible to prevent oil leakage from the pump chamber 10 and suppress deterioration of pump efficiency.

[Brief description of drawings]

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

2 is a cross-sectional view taken along the line A, A in FIG.

FIG. 3 is a cross-sectional view taken along line B, B in FIG.

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

 1 rotor 2 yoke 3 thrust plate 4 washer 5 oil groove 8 drive shaft 9 oil supply passage 10 pump chamber 13 eccentric portion 14 oil suction port 17 protrusion 42 cylinder

Claims (2)

[Claims] 1. A drive shaft 8 fixed to a lower portion of the drive shaft 8.
A rotor 1 provided with an eccentric portion 13 having an eccentric shaft center, and a pump chamber 1 fitted to an outer peripheral portion of the eccentric portion 13.
A yoke 2 defining 0 and a thrust plate 3 arranged at the bottom of the eccentric portion 13, and the oil taken in from an oil intake port 14 opening at the bottom of the eccentric portion 13 is passed through the pump chamber 10. In an oil supply pump device for a compressor that pumps up to an oil supply passage 9 provided in the drive shaft 8, an annular shape that closes the bottom portion of the pump chamber 10 between the bottom surface of the eccentric portion 13 and the receiving surface of the thrust plate 3. A washer 4 is provided, the washer 4 is attached to the rotor 1 so as to be rotatable together, and an oil groove 5 is provided on the receiving surface of the thrust plate 3.
An oil supply pump device for a compressor, characterized in that 2. A bottom portion of the eccentric portion 13 is provided with a projecting portion 17 for opening the oil suction port 14 downward, and a cylindrical portion 42 which is fitted into the outer peripheral portion of the projecting portion 17 by press fitting is provided at the center of the washer 4. The compressor oil supply pump device according to claim 1, which is provided in a protruding manner.