JP2510558B2 - Oil supply device for rotary type hermetic compressor - Google Patents

Description

The present invention relates to an oil supply device for a rotary hermetic compressor,
In particular, the present invention relates to a lubrication device for a rotary type hermetic electric compressor suitable for ample lubrication even at low speeds.

[Conventional technology]

A conventional oil supply device for a rotary hermetic compressor will be described with reference to FIG. FIG. 3 is a vertical sectional view of a rotary hermetic compressor. In the figure, the electric element
33 is arranged, and the electric element 33 is composed of a stator 45 and a rotor 44. The rotating shaft 34 is fixed to the rotor 44 by press fitting or shrink fitting, and the rotating shaft 34 has an upper bearing 35 and a lower bearing.
Held by 36. A roller 41 is rotatably fitted to an eccentric part (not shown) of the rotary shaft 34, and the roller 41 is a space formed by a cylinder 42, a lower end flange part of an upper bearing 35, and an upper shaft flange part of a lower bearing 36. Rotate inside. The refrigerant gas is sucked in through the suction pipe 46, compressed, and then discharged into the discharge valve 47.
It is further discharged into the closed container 31, passes through a clearance between the stator 45 and the rotor 44, and is discharged from the discharge pipe 48 to the outside of the closed container 31. The refrigerating machine oil is stored in the bottom of the closed container 31, the oil supply cylinder 37 is fixed to the lower bearing 36, and is immersed in the refrigerating machine oil. The refueling piston 40 is press-fitted into the lower end of the rotating shaft 34.
Rotates in an oil supply chamber 39 formed by covering the lower bearing 36 with a cover 37, compresses the refrigerating machine oil in the oil supply chamber 39 upward, and pushes it out into the communication holes 51, 52. Lubricating oil is supplied into the oil supply chamber 39 through the lubricating oil inlet 38 provided in the cover 37. The refrigerating machine oil that has risen through the communication holes 51 and 52 is supplied to the sliding surfaces of the upper bearing 35 and the lower bearing 36, respectively.

Incidentally, as one related to the oil supply device of this type rotary hermetic electric compressor, for example, there is JP-A-61-157788.

[Problems to be solved by the invention]

In the above conventional technology, the refrigerant is dissolved in the refrigerating machine oil,
When the refueling piston rotates, the partially decompressed refrigerant is vaporized and bubbles are generated. Especially when there is a large amount of refrigerant that has melted, such as after defrosting, the refueling chamber is filled with vaporized gas refrigerant, and bubbles are blocked in the communication passage where gas is poorly discharged, causing vapor lock, and refrigerating machine oil no longer flows.
There was a possibility of causing seizure or wear at the sliding parts of the bearing.

It is an object of the present invention to provide an oil supply device for a rotary hermetic electric compressor that can provide sufficient oil supply even at a low speed and prevent seizure and wear of a bearing sliding portion.

[Means for solving problems]

The object of the invention is to provide a rotary hermetic compressor oil supply device in which refrigerating machine oil is stored at the bottom of a container in which an electric element is arranged on the upper side and a compression element is arranged on the lower side through a rotating shaft, and a circle is formed at the lower end of the rotating shaft. This is accomplished by providing a plate and providing oil concentrating means on the bottom of the container opposite the disc.

[Action]

When the disc rotates with the rotating shaft, the refrigerating machine oil on the lower side of the disc rotates due to viscosity, so that the refrigerating machine oil becomes a vortex and is concentrated under the rotating shaft and supplied to the oil supply hole of the rotating shaft. As a result, the refrigerating machine oil rotates with the rotation of the disc, so that the refrigerating machine oil can be efficiently supplied to the sliding portion without foaming.

〔Example〕

 Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 is a view for explaining an embodiment of the present invention, and the present invention will be explained with a flat plate attached to a rotary shaft and a vertical hole for oil supply provided at the center of the rotary shaft.

Further, in the present invention, an oil concentration means may be used to efficiently supply the refrigerating machine oil.

Note that the same reference numerals as those in FIG. 3 indicate the same or equivalent items, and thus the description thereof will be omitted.

In the figure, 31 is an airtight container in which refrigerating machine oil is stored at the bottom. A rotating shaft 34 connects the electric element 33 and a compressor unit including a cylinder 42 and the like. Reference numeral 4 is a vertical hole for oil supply at the center of the rotary shaft. Reference numeral 5 is a lateral hole provided in the rotary shaft 34 for communicating the hole 4 with the sliding portion of the bearing portion. Reference numeral 1 is a flat disk provided on the lower end of the rotary shaft 34. This disk 1 is immersed in refrigerating machine oil.

That is, when the disc 1 rotates as the rotating shaft 34 rotates, the refrigerating machine oil also rotates due to the viscosity of the refrigerating machine oil. As a result, the refrigerating machine oil rotates together with the disc 1 and does not foam. Moreover, since the refrigerating machine oil rotates to generate vortices, the refrigerating machine oil is concentrated below the rotating shaft and is efficiently supplied into the vertical hole 4 for oil supply of the rotating shaft 34.

FIG. 2 is a sectional view taken along the line AA in FIG. 1, in which an oil concentrating means is provided at a position facing the flat plate.

In the figure, 2 is an oil concentrating means provided at the bottom of the closed container 31 facing the disc 1. This oil concentration means is formed by a plurality of partition plates. Hereinafter, the oil concentration means 2 will be referred to as a partition plate.

In this partition plate 2, the end portions 3 of the partition plate 2 are concentrated below the rotary shaft 34 so that the lubricating oil is further concentrated in the lower part of the vertical hole 4 of the rotary shaft 34. As the rotary shaft 34 rotates, the disk 1 rotates, and the refrigerating machine oil below the disk 1 rotates due to viscosity, flows along the partition plate 2 below the rotary shaft 34, and concentrates at the bottom of the vertical hole 4. To do. The pressure of the concentrated lubricating oil rises, the flow is changed to the direction of going up the vertical hole 4, and is supplied from the horizontal hole 5 to each sliding portion.

〔The invention's effect〕

According to the present invention, when the disc rotates together with the rotating shaft, the refrigerating machine oil on the lower side of the disc rotates due to viscosity, and further, the refrigerating machine oil becomes a vortex by the oil concentrating means at the bottom of the container to form a vortex below the rotating shaft. Is concentrated on and is supplied to the oil supply hole of the rotary shaft. Thereby, the refrigerating machine oil can be efficiently supplied to the sliding portion without foaming. That is, when the refueling piston provided on the conventional rotary shaft rotates, the refrigerant dissolved in the refrigerating machine oil vaporizes to generate bubbles, and the refrigerating machine oil does not flow because the bubbles are clogged in the communication passage where the gas does not escape well,
This has the effect of preventing seizure and wear at the bearing sliding parts.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotary hermetic compressor of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a conventional rotary hermetic compressor. FIG. 1 ... Disc, 2 ... Oil concentration means, 3 ... One end, 4 ...
Vertical hole, 5 ... Horizontal hole, 31 ... Airtight container, 33 ... Electric element,
34 …… Rotary shaft, 35 …… Upper bearing, 36 …… Lower bearing, 37 …… Cover, 38 …… Lubricant inlet, 41 …… Roller, 42 …… Cylinder, 44 …… Rotor, 45 …… Stator , 46 …… Suction tube,
47 ... Discharge valve, 48 ... Discharge pipe, 39 ... Oil supply chamber, 40 ... Oil supply piston, 51, 52 ... Communication holes.

Claims (1)

(57) [Claims] 1. A lubrication device for a rotary hermetic compressor in which oil is stored at the bottom of a container having an electric element on the top and a compression element on the bottom via a rotary shaft, and a circle is provided at the lower end of the rotary shaft. An oil supply device for a rotary hermetic compressor, characterized in that a plate is provided and an oil concentrating means is provided at the bottom of the container facing the disk.