JPH0134720Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a horizontal rotary compressor, and particularly relates to improving the lubrication performance of bearings.

[Conventional technology]

FIG. 1 is a sectional view similar to a conventional horizontal rotary compressor shown in, for example, Japanese Utility Model Application No. 56-150880. are housed in a horizontally arranged state, and lubricating oil 4 is stored at the inner bottom.

The driving force from the electric element 2 is transmitted to the compression element 3 by a crankshaft 5, which is rotatably supported by a long bearing 7 and a short bearing 8 located on both sides of a cylinder 6. . The refrigerant compressed within the cylinder 6 passes through a discharge valve device 9 and is discharged into a discharge muffler 10 that covers the discharge valve device 9.

Most of the refrigerant in this discharge muffler passes through the discharge hole 11 provided in the discharge muffler to the closed container 1.
is discharged into the discharge pipe 1 through the gap between the electric element 2
2 and is sent to the refrigeration circuit.

Further, a part of the refrigerant in the discharge muffler 10 is guided into the oil 4 by the oil pump 14 through a gas hole (gas) formed by penetrating the long bearing 7, the cylinder 6, and the short bearing 8. The oil 4 is sucked into the oil pump 14 by dynamic pressure and pushed up into the oil sump container 15 attached to the end of the short bearing 8, and the oil 4 is pumped into the crankshaft 5.
It is sent together with oil into the oil supply hole 16 that penetrates inside.

The crankshaft 5 has a branched oil supply hole 17 for supplying oil to the bearing surfaces of the short bearing 8 and the long bearing 7 from the oil supply hole 16 of the shaft center. Further, as described above, the refrigerant fed into the oil supply hole 16 of the crankshaft 5 together with oil is guided to the space inside the closed container 1 through the gas vent hole 18 in the same manner as described above.

In addition, since the oil supplied to each bearing from the oil supply hole 17 needs to be discharged from each bearing after fulfilling its role of lubrication, a spiral oil groove is formed on the inner peripheral surface of the bearing on the side opposite to the load. The rotation of the crankshaft 5 causes oil to be discharged from the ends 19 and 20 of the bearing.

[The problem that the idea attempts to solve]

The oil lubrication system for conventional horizontal rotary compressors is configured as described above, so the oil between the long bearing and the crankshaft is sequentially discharged from the end of the bearing, but the oil on the short bearing side is discharged from the end of the bearing. Since the oil is pumped into the oil sump container installed in the bearing, the drainage effect is extremely reduced and the ability to supply oil from the oil supply hole is also reduced, causing short bearings to be repeatedly lubricated with the same oil. It ends up.

As a result, the oil temperature rises, the lubrication performance decreases, and in the worst case, the crankshaft and the short bearing may seize, reducing the reliability of the compressor.

This idea was made in order to improve these drawbacks, and an oil drain hole is provided in the middle of the bearing in the longitudinal direction of the bearing, on the anti-load side, to which the oil sump container is attached. The aim is to create a highly reliable horizontal rotary compressor by constantly feeding new oil for lubrication through a structure that increases discharge capacity.

[Means to solve the problem]

The horizontal rotary compressor according to this invention has an oil drain hole provided at a position on the anti-load side in the middle of the bearing in the longitudinal direction of the bearing, which has an oil sump container attached to the end.

[Effect]

In the horizontal rotary compressor according to this invention, old oil that has served as a lubricant is discharged from the discharge hole of the bearing, and new oil is sequentially supplied from the oil supply hole to provide stable lubrication performance.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 2, parts that are the same as or corresponding to those of the conventional system are given the same reference numerals and their explanations will be omitted. 21
is a position on the anti-load side in the middle of the bearing length direction of the bearing 8, which is equipped with an oil reservoir 15 at the end to store the oil sucked by the oil pump 14, that is, in the embodiment, the oil storage container 15 opened at the bottom of the bearing 8. The discharge hole 23 is a helical or linear oil groove formed on the inner circumferential surface of the bearing in communication with the discharge hole.

Therefore, the oil pushed into the oil sump container 15 attached to the end of the bearing 8 by the oil pump 14 is
The oil enters the gap 22 between the bearing 8 and the crankshaft 5 through the oil supply holes 16 and 17 of the crankshaft, and after fulfilling the role of lubrication, it is discharged from the discharge hole 21 into the sealed container 1, so that new oil flows from the oil supply hole 17. Since the bearings are supplied sequentially and the bearings are lubricated, the gap 20
The internal oil temperature hardly rises and stable lubrication performance can be maintained.

Further, the oil that has entered between the bearing 7 on the electric element 2 side and the crankshaft 5 and played the role of lubrication is discharged from the end of the bearing opposite to the cylinder 6.

[Effect of idea]

As described above, according to this invention, the oil discharge hole is provided at the position on the anti-load side in the middle of the bearing length of the bearing with the oil sump container attached to the end.
With a simple structure, new oil is sequentially supplied to the gap between the crankshaft and the bearing, making it possible to maintain stable lubrication performance and improve the reliability of the compressor.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional horizontal rotary compressor, Fig. 2 is a sectional view of essential parts of a horizontal rotary compressor according to an embodiment of this invention, and Fig. 3 is a perspective view of the bearing shown in Fig. 2. It is. 1 is a closed container, 2 is an electric element, 3 is a compression element,
4 is oil, 5 is a crankshaft, 6 is a cylinder, 8 is a bearing, 15 is an oil sump container, 16 and 17 are oil supply holes, 2
1 is a discharge hole, and 22 is an oil groove. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] The electric element and the compression element driven by the electric element are housed horizontally in a sealed container, and the crankshaft that transmits the driving force from the electric element is connected by bearings located on both sides of the cylinder. A part of the refrigerant discharged from the cylinder is guided into the oil stored at the bottom of the sealed container, and its dynamic pressure is used to push the oil up into the oil sump container glued to the end of the bearing. For lubrication between the bearing and the bearing, an oil drain hole is provided at a position on the anti-load side in the middle of the bearing length of the bearing with an oil sump container attached to the end, and one end of this drain hole is A horizontal rotary compressor, characterized in that the compressor is connected to an oil groove formed on the inner circumferential surface of the bearing, and the other end thereof is opened into the airtight container and into the space.