JPS6134383A - Lubricating oil controlling device for enclosed rotary engine - Google Patents

Abstract

PURPOSE:To secure the quantity of oil in a sump regardless of the speed of rotation of a compressor to carry out stable lubrication by providing an oil quantity regulating device on the bottom end of the drive shaft of a closed rotary compressor. CONSTITUTION:The lower end of the drive shaft 4 of a closed rotary compressor is immersed in a lubricating oil sump (c), and an oil feeding passage (d) is provided in the drive shaft 4. On the bottom end of the drive shaft 4, a disk which is supported by a supporting member 14, is provided in such a way that its one side is connected to one end of a spring 16 which is installed on the bottom part of a closed container while the other side is faced to the opening part of the oil feeding passage (d) of the drive shaft 4. Thereby, the disk moves up and down in accordance with the speed of rotation of the compressor, to vary clearance on the oil feeding passage opening, enabling stable feeding of oil at all times while securing the quantity of oil in a lubricating oil sump.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to lubricating oil amount control and installation for a rotary hermetic compressor.

Structure of the conventional example and its problems In the conventional rotary hermetic compressor, as shown in FIG. The compression element provides a pressure N of the refrigerant. This compression element includes a cylinder 5 located at the bottom,
An end plate 6 that closes the cylinder 5 from above and below and supports the crankshaft 4 at the same time, and an end plate 6 that is arranged at an eccentric portion a of the crankshaft 4 and rotates together with the crankshaft 4 while abutting the inner periphery of the cylinder 5. It consists of a roller 7 that slides into a groove provided in the cylinder 5 and a partition plate 8 that reciprocates. At this time, each part of the compression element has a sliding surface, and the In order to do this, lubricating oil cf is sealed in the lower part of the airtight container, and an oil pump 9 disposed at the lower part of the first rank shaft 4 is applied to the sliding surfaces of each part through a passage d penetrating the shaft center of the crankshaft 4. The lubricating oil cf' is supplied. However, the amount of lubricating oil supplied by the oil pump increases or decreases in proportion to the number of rotations of the crankshaft 40.

2. If you use a frequency converter to change the compressor's rotation speed by 7 degrees, it is first necessary to ensure the amount of lubricating oil at low rotation speeds, so the oil pump The supply capacity is set, and since the lubricating oil supply capacity increases in proportion to the rotational speed at high rotational speeds, the lubricating oil is released into the space e above the electric motor 2 through a passage d penetrating the axis of the crankshaft 4. The amount increases.

Therefore, a large amount of lubricating oil exists in the space e in the form of mist or liquid, and a large amount of lubricating oil is discharged into the cycle together with the compressed refrigerant 4 discharged from the discharge pipe 10 disposed at the upper part of the closed container 1. The compressor 11 of the refrigeration cycle shown in FIG.
is discharged to the heat exchanger 12. A large amount of lubricating oil Vctri adheres to the inner wall of the heat exchanger 12, reducing the heat exchanger capacity, and the amount of lubricating oil remaining in the closed container 1 of the compressor decreases, causing the crankshaft 4 This has the drawback of causing seizure due to insufficient lubrication of the sliding portion between the partition plate 8 and the groove provided in the cylinder 5.

Purpose of the invention Zero engine 8Ar/iz To solve the above-mentioned drawbacks of the conventional technology, the oil pump capacity is constant regardless of the rotational speed of the crankshaft, and the space above the electric motor is The aim is to improve reliability by ensuring a small and stable amount of lubricating oil released into the tank and a sufficient amount of lubricating oil remaining at the bottom of the sealed container.

Composition of the Invention The lubricating oil control device for a rotary hermetic compressor of the present invention includes an electric motor and a compression mechanism driven by the electric motor disposed inside an airtight container, and the compression mechanism is connected to a crankshaft and a roller. a cylindrical cylinder, a partition plate that is slidably inserted into a groove provided in the cylinder and moves back and forth, an elastic wire that urges the partition plate to constantly contact the roller, and both ends of the cylinder. Rotary compression mechanism with full end plate and no end plate installed,
The direction of spreading from the center to the lower position of the crankshaft
1, a disc having several holes in contact with the inclined part and located within the inner diameter of the through hole of the crankshaft, and further sealed with the disc. By connecting the lower part of the container and arranging an elastic member that urges the disc toward the closed container, the oil pumping capacity is kept constant regardless of the rotational speed of the crankshaft. DESCRIPTION OF ONE EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Components that are the same as in the prior art are given the same numbers and their explanations will be omitted.

In the figure, a support 14 having elasticity and having a substantially rectangular cross section in the vertical direction is attached to the lower outer periphery of the crankshaft 4.
The supporting member 14 has an inclined portion 1 at a position below the crankshaft 4. A disk 15 is provided above the inclined portion.
The disk 15 and the lower part of the sealed container 1 are connected by an elastic member 16.As is clear from this structure, when an outward force in the radial direction of the crankshaft 4 is applied to the support 14, the support 14 14 is bent outward and the angle g of the inclined portion becomes smaller, and the disk 14 is urged by the elastic member 16 along the inclined portion and moves downward. When the outward force is removed, the support 14 no longer deforms outward, the inclined portion f returns to its original shape, and the disk 15
moves upward along the slope f and returns to its original position. At this time, Kfl minute gap h' between the disc 15 and the end face of the crankshaft 4
There is no contact. Further, a plurality of holes 17 are provided in the disc 15 within the diameter of the passage d, which is a through hole of the crankshaft 4, to form a passage for lubricating oil.

In the above structure, the lubricating oil stored at the bottom of the closed container is
Hole L7' of the disc 15 passes through the central passage d of the crankshaft 4 and is supplied to each sliding part via a passage (not shown) perpendicular to the passage d provided in the middle of the passage d. .

Here, if the rotation speed of the crankshaft 4 is small, the support 14
is not deformed, and the gap between the disc 15 and the end face of the crankshaft 4 remains unchanged. When the rotational speed of the crankshaft 4 increases, the support 14 is deformed outward from the axis due to centrifugal force, and the disk 15 that comes into contact with the inclined portion is moved along the inclined portion f by the elastic material 1.
6, the crankshaft 4 is moved downward one step, and the gap between the disc 15 and the crankshaft 4 is enlarged.

As the gap is enlarged, the high-pressure lubricating oil generated on the outer periphery of the passage d of the crankshaft 4 is released from the gap, so that the oil pumping effect generated at the bottom of the crankshaft 4 is reduced. . If the speed increases further, the gap will further expand and the oil pumping effect will further decrease. However, since the high-pressure liquid pressure generated on the outer periphery of the central passage d of the crankshaft 4 increases as the rotation speed increases, the rotation speed of the crankshaft 4 is Therefore, the oil pump capacity generated at the bottom of the crankshaft 4 remains constant regardless of changes in the rotational speed.

Effects of the Invention As is clear from the above embodiments, the lubricating oil amount control device for a rotary hermetic compressor of the present invention has a support fixed to the lower part of the crankshaft with an inclined part that is inclined in a direction that spreads from the center. 't
- In addition, an elastic material is placed at the bottom of the sealed container so that a disc with a hole comes into contact with it and urges this disc downward, and the gap between the crankshaft and the disc is controlled. , the amount of lubricating oil discharged into the space above the crankshaft is stabilized in a small amount regardless of changes in the rotational speed of the crankshaft, and ′j? This method has various advantages, such as stabilizing the amount of lubricating oil remaining at the bottom of the closed container, improving the reliability of the compressor, and preventing a decrease in heat exchanger capacity and compressor performance.

[Brief explanation of drawings]

An explanatory diagram of the lubricating oil amount control device section in the compressor when it is stopped and when it is in operation. Fig. 4 is a vertical cross-sectional view of the compressor showing a conventional example. Fig. 5
The figure is a cross-sectional view of the same compressor, and FIG. 6 is a refrigeration cycle diagram. 1...Airtight container, 2...Electronic machine, 3.
...Rotor, 4...Crankshaft, 5...
-... Cylinder, 6... End plate, 7...
Roller, 8... Partition plate, 9... Oil pump, '1 11... Compressor, 14... Support, 1
5... Disk, 16... Elastic material, 17.
...hole, b...groove, C...lubricating oil, d...passage, e...space, f...
... Slanted part, g ... Gap. Name of agent: Patent attorney Toshio Nakao 1 person ￥k
IFigure 2Figure 3Figure 4

Claims (1)

[Claims] An electric motor and a compression mechanism driven by the electric motor are disposed inside an airtight container, and the compression mechanism is slidable into a crankshaft, a roller, a cylindrical cylinder, and a groove provided in the cylinder. A rotary compression mechanism includes a partition plate that is inserted into the cylinder and moves back and forth, an elastic wire that urges the partition plate to constantly contact the roller, and end plates disposed at both ends of the cylinder. At a position below the shaft, a support having an inclined part inclined in a direction expanding from the center, and a disk having several holes abutting on the inclined part and located within the inner diameter of the through hole of the crankshaft are disposed. A lubricating oil amount control device for a rotary hermetic compressor, further comprising an elastic member connecting the disc and a lower part of the hermetic container and urging the disc toward the hermetic container.