JPH0617755A - Oil feeding device for closed type compressor - Google Patents

Abstract

PURPOSE:To fix an oil pick-up, arranged to the lower end of the oil feed hole of a rotary shaft, on a rotary shaft by means of a gas bleeding part. CONSTITUTION:An oil pump member 18 immersed in oil in an oil reservoir 7 stored in a closed container 1 is attached to the lower end of a rotary shaft 5. The oil pump member is composed of a gas bleed part 20 additionally functioning as a mounting pin locked on the rotary shaft 5 and an oil pick up 21 engaged with the gas bleed part. The gas bleed part 20 is formed such that a resilient metallic sheet is curved in a cylindrical shape and a gap is provided between mating surfaces. The gas bleed part 20 is provided on both sides with notch protrusions locked on the rotary shaft 5 in an oil feed hole 17. An engaging hole engaged with the gas bleed part 20 and a cut are formed in the oil pick up 21, and the oil pick up is mounted in a way that the engaging hole is engaged with the gas bleed part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an oil supply device for a hermetic compressor.

[0002]

2. Description of the Related Art Conventional lubrication devices for hermetic compressors are
An oil pump member consisting of a cylindrical oil pickup formed by pressing and drawing an iron plate or iron pipe and a paddle formed by processing a thin plate is press-fitted and attached to the lower end of the rotary shaft to attach oil. It is supplied to each sliding portion (see, for example, Japanese Utility Model Publication No. 1-30631).

[0003]

However, since the conventional oil supply device is formed by pressing an iron plate, an iron pipe, etc., there is a problem that the accuracy of the oil pump is difficult to obtain and the characteristics of the oil pump are impaired. .

Therefore, it has been proposed to integrally form the oil pump with a resin (see Japanese Patent Publication No. 63-38553) or integrally with a metal injection molding (see Japanese Patent Laid-Open No. 2-86971). ing.

However, since the one integrally formed of resin is fitted and mounted from the outside of the rotary shaft, the oil pickup must be fixed by a dedicated spring,
In addition to increasing the number of parts, in order to mount the oil pickup on the outside of the rotary shaft, the rotary shaft must be mounted on the motor case or the rotor before mounting the oil pickup, which makes it difficult to mount the oil pickup. was there. Further, the one integrally formed by metal injection molding has a problem that the material cost becomes extremely high as compared with the press working.

The present invention solves the above problems.
An object of the present invention is to provide an oil supply device for a hermetic compressor that reduces assembly work and cost without degrading pump performance.

[0007]

The present invention has an electric element and a compression element in a closed container having an oil sump at the bottom, and an oil supply hole for supplying the oil of the oil sump to a sliding portion of the compression element. A hermetically sealed type in which a rotary shaft for transmitting the rotational force of the electric element to the compression element is housed, and an oil pump member is provided at the lower end of the rotary shaft so as to be immersed in the oil in the oil reservoir and locked in the oil supply hole. In an oil supply device for a compressor, the oil pump member is composed of a degassing part also serving as a mounting pin engaged with a rotating shaft, and an oil pickup engaged with the degassing part. An engaging hole to be fitted to the degassing part is provided, a gap is formed on the mating surface of the degassing part formed by bending the elastic metal thin plate into a cylindrical shape, and a rotary shaft is provided in the oiling hole in the degassing part. Lock on It is provided with a notch projection.

[0008]

The present invention is constructed as described above,
The oil pickup is locked to the rotary shaft by a gas releasing component that also serves as a mounting pin, so that the oil pickup can be securely mounted on the rotary shaft even if the oil pickup is made of plastic having a weak press-fitting strength.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a hermetic compressor showing an embodiment of the present invention. FIG. 2 is an exploded perspective view showing a state where the oil pump member is attached to the rotary shaft of the present invention. FIG. 3 is an exploded cross-sectional view of mounting the oil pickup on the rotary shaft of the present invention. FIG. 4 is a sectional view of an essential part showing a state in which an oil pump member is attached to the rotary shaft of the present invention. Figure 5
FIG. 4 is a cross-sectional view of a main part showing a state in which a gas venting component is attached to the rotary shaft of the present invention. FIG. 6 is an exploded perspective view of essential parts showing a state in which a gas venting component is attached to the rotary shaft of the present invention.

Reference numeral 1 denotes an airtight container in which a motor case 2, a compression element 3 arranged on the upper side of the motor case, an electric element 4 similarly arranged on the lower side, and a rotation of the electric element. A rotary shaft 5 for transmitting the force to the compression element 3 is housed therein. The compression element 3 and the electric element 4 are suspended and supported by the elastic support device 6 on the inner wall of the closed container 1 via the motor case 2. An oil reservoir 7 that stores oil is provided at the bottom of the closed container 1.

The electric element 4 is composed of a stator 9 having a winding 8 inside and a rotor 10 arranged inside the stator and having a rotary shaft 5 inserted in the center thereof.

The compression element 3 includes a cylinder 11, a piston 13 which is fitted in a crank pin 12 of a rotary shaft 5 and slides back and forth in the cylinder 11, and a valve seat 14 on an end face of the cylinder 11.
And a cylinder head 15 attached via. The motor case 2 has a bearing 1 that supports the rotating shaft 5.
6 is integrally formed.

The rotary shaft 5 has a compression element 3 and a bearing 16 at its center.
An oil supply hole 17 for supplying oil is provided to each sliding portion such as. 18 is attached to the lower end of the rotary shaft 5
7 is an oil pump member communicating with 7, and the oil pump member is inserted into the hole 19 of the rotary shaft 5 and is fitted with a degassing component 20 which also serves as a mounting pin, and the lower end is immersed in the oil in the oil reservoir 7. It is composed of an oil pickup 21 which is engaged with the degassing component 20.

The degassing part 20 is formed by bending a thin elastic metal plate into a cylindrical shape and forming a gap 22 on the mating surface of the thin metal plate. The degassing component 20 is provided with cutout protrusions 23 that engage with the rotating shaft 5 in the oil supply hole 17 on both sides. The outer diameter R1 of the rotary shaft 5 is longer than the length L1 of the degassing component 20 and has a relationship of R1 ≧ L1. Further, the inner diameter R2 of the rotating shaft 5 is longer than the width L2 of the cutout projections 23 on both sides of the gas venting component 20, and R2 ≧ L.
There is a relationship of 2. That is, the degassing component 20 is designed so as not to project from the rotary shaft 5 when mounted.

The oil pickup 21 is formed by injection molding of plastic integrally with a paddle 24 for improving the oil supply capacity. And the oil pickup 21
A notch 25 that is opened on the side of the rotary shaft 5 that is inserted into the oil supply hole 17 and an engagement hole 26 that is in communication with this notch and that engages with the degassing component 20 are provided. The oil pickup 21 has an outer diameter L3 on the insertion side larger than the inner diameter R2 of the rotary shaft 5. The width of the notch 25 before the insertion of the oil pickup 21 is the degassing part 2
It is larger than 0, and the width of the notch 25 after insertion is smaller than that of the degassing part.

The mounting portion of the oil supply hole 17 of the rotary shaft 5 for mounting the oil pickup 21 is formed in a tapered shape in which the insertion side is widened toward the tip.

In the oil supply device for a hermetic compressor having such a structure, when the electric element 4 is energized, the rotating shaft 5 is rotated by the rotor 10 and the rotational force of the electric element 4 is transmitted to the compression element 3. The piston 13 of the compression element 3 is moved to the cylinder 11 by the crankpin 12 of the rotary shaft 5.
It slides back and forth inside to compress the refrigerant. The oil in the oil sump 7 is supplied to the bearing 15 of the motor case 2 and the sliding portion of the compression element 3 by an oil pump member 18 attached to the lower end of the rotary shaft 5.

The oil pump member 18 has a hole 19 in the rotary shaft 5.
After inserting the degassing component 20 into the, the oil pickup 21 is inserted from the lower end of the oil supply hole 17 of the rotary shaft 5, the notch 25 is aligned with the degassing component 20, and the notch is shortened to engage with the engaging hole 26. I am trying to attach them together. That is, the oil pickup 21 has the rotating shaft 5
By inserting it into the oil supply hole 17 of the above, the outer diameter of the insertion side becomes smaller and the width of the notch 25 becomes smaller, so that the engaging hole 26 is engaged with the degassing component 20 and the degassing component is contracted to reduce the gap 22. The gas venting part 20 is prevented from coming off without narrowing the width of the.

The oil pump member 18 has an outer diameter R of the rotary shaft 5.
By attaching the degassing part 20 having a length shorter than 1 and the oil pickup inserted into the oil supply hole 17 of this rotary shaft, the rotary shaft 5 can be attached to this rotary shaft before being assembled to the electric element 4. This prevents the assembly work from becoming complicated. Moreover, the oil pump member 18 guides the gas contained in the oil rising in the oil supply hole 17 through the gap 22 of the degassing part 20 into the degassing part by fixing the oil pickup 21 with the degassing part 20. Therefore, the gas is prevented from accumulating in the oil supply hole 17 to prevent the occurrence of gas lock.

The oil pump member 18 is a degassing part 20.
By fixing the oil pickup 21 to the rotary shaft 5, the number of parts can be reduced. Also,
Since the oil pickup 21 is fixed in the oil supply hole 17 of the rotary shaft 5 with a weak force, the insertion work is simplified, and it is possible to prevent the rotary shaft 5 from being deformed by the mounting stress at the time of fixing. ing.

The degassing part 20 is provided with cutout projections 23 on both sides in the oil supply hole 17 for engaging with the rotary shaft 5.
It is designed so as not to fall out of the hole 19 of the rotary shaft 5. Further, the degassing part 20 and the oil pickup 21 are loosely engaged with each other, so that the gap 22 between the degassing part 21 is not narrowed by the oil pickup, and the oil supply performance of the oil pickup 21 is affected. I try not to. Further, the degassing component 20 is formed in a cylindrical shape having a gap 22 on the mating surface, and is locked to the rotary shaft 5 by the notch projections 23, so that the insertion allowance of the rotary shaft can be reduced and the oil supply hole 17 The hole diameter is increased to improve the oil supply capacity.

[0023]

As described above, according to the present invention, the oil pump member is composed of the degassing part also serving as the mounting pin engaged with the rotating shaft, and the oil pickup engaged with the degassing part. Then, the oil pickup is provided with an engagement hole to be fitted into the degassing part, and a gap is formed on a mating surface of the degassing part formed by bending an elastic thin metal plate into a cylindrical shape, and the degassing part is formed. Since a cutout projection that locks to the rotary shaft is provided in the oil supply hole, the gas release part can be locked in the oil supply hole by the spring property of the gas release part itself and the cutout projection, and is fixed to the rotary shaft. The cost can be reduced and the oil supply hole of the rotary shaft can be enlarged to improve the oil supply capacity. Moreover, according to the present invention, by loosely engaging the oil pickup with the degassing component, the oil pickup can be made of plastic, and the processing accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a hermetic compressor showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a state in which an oil pump member is attached to the rotary shaft of the present invention.

FIG. 3 is an exploded cross-sectional view of mounting an oil pickup on the rotating shaft of the present invention.

FIG. 4 is a cross-sectional view of essential parts showing a state in which an oil pump member is attached to the rotary shaft of the present invention.

FIG. 5 is a cross-sectional view of essential parts showing a state in which a gas venting component is attached to the rotary shaft of the present invention.

FIG. 6 is an exploded perspective view of essential parts showing a state in which a gas venting component is attached to the rotary shaft of the present invention.

[Explanation of reference numerals] 1 airtight container 3 compression element 4 electric element 5 rotating shaft 7 oil reservoir 17 oil supply hole 18 oil pump member 20 degassing part 21 oil pickup 22 gap 23 notch projection 26 engagement hole

Claims (1)

[Claims] 1. A rotating force of the electric element, comprising an electric element and a compression element in an airtight container having an oil sump at the bottom, and an oil supply hole for supplying the oil of the oil sump to a sliding portion of the compression element. A rotary shaft for transmitting the oil to the compression element is housed, and the lower end of the rotary shaft is provided with an oil pump member that is immersed in the oil in the oil reservoir and locked in the oil supply hole. In the device, the oil pump member is a degassing component that also serves as a mounting pin engaged with a rotating shaft,
An oil pickup that is locked to this gas venting part is provided with an engagement hole that fits into the gas venting part. The gas venting part is made by bending an elastic thin metal plate into a cylindrical shape. An oil supply device for a hermetic compressor, comprising a notch projection formed in a shape having a gap on its mating surface and engaging with a rotating shaft in the oil supply hole.