JPS6219592B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a mechanism for supplying oil to a bearing of a refrigerant compressor.

Figure 1 shows a conventional refrigerant compressor, where 1 is a horizontally installed crankshaft, 2 is a crankshaft 1
5 is an oil hole drilled in the center of the crankshaft 1 and has one end opening into the oil sump 2; 6 is a connecting oil sump; Rod, 7 is the bearing part of the connecting rod 6, 8
is the main bearing on the oil sump side, 9 is the main bearing on the opposite oil sump side, 10
is the oil supply hole, 11 is the electric element, 12 is the electric element chamber,
13 is a crank chamber, and 14 is a partition wall that partitions the electric element chamber 12 and the crank chamber 13.

Next, the operation of the above configuration will be explained. The lubricating oil 4 splashed up by the oil scraper mechanism 3 is stored in the oil reservoir 2, flows into the oil hole 5, and is pumped up through the oil supply hole 10 by the centrifugal force generated as the crankshaft 1 rotates. bearing 7,
8 and 9.

However, the lubricating oil flowing into the oil hole 5 contains bubbles generated due to stirring by the oil scraper mechanism 3, and furthermore, the refrigerant dissolved in the lubricating oil is caused by the heat generated by the bearings 7, 8, and 9. Because of the vaporization, the flow of the lubricating oil 4 was obstructed, and sufficient lubricating oil could not be supplied to the bearings 7, 8, and 9, which could lead to seizure.

The present invention aims to eliminate the drawbacks of the above-mentioned conventional devices, and one embodiment of the present invention will be described below with reference to the drawings. That is, FIG. 2 shows the main part, and FIG. 3 is a sectional view taken along the - line in FIG.
16 is a ring-shaped cavity provided in the middle of the main bearing 9 on the side opposite to the oil sump, and 16 is a communication pipe that projects into the center of the oil hole 5 and communicates with the cavity 15. 17 is a communication pipe 16
The pore 18 provided inside is a communication hole that communicates the empty chamber 15 and the crank chamber 13, and this communication hole 18
is provided at a higher position than the oil hole 5. Note that the other parts are the same as the conventional one, so explanations will be omitted.

In the above configuration, the operation thereof will be explained next. Due to the centrifugal force generated as the crankshaft 1 rotates, lubricating oil with a relatively high specific gravity is separated toward the inner wall of the oil hole 5, and air bubbles with a relatively low specific gravity are separated toward the center of the oil hole 5. Ru. Therefore, even if air bubbles occur inside the oil hole 5, the opening on the oil hole 5 side of the oil supply hole 10 is always filled with lubricating oil, so there is no risk of insufficient supply of lubricating oil;
The air bubbles accumulated in the center of the pipe are guided into the cavity 15 through the small hole 17 provided in the communication pipe 16, and are further discharged into the crank chamber 13 through the communication hole 18, so that the lubricating oil becomes oily. It flows smoothly inside the hole 5.

In other words, in this invention, the empty chamber 15 for discharging air bubbles is communicated with the crank chamber 13 through the communication hole 18, and the pressure in both chambers 15 and 13 is equalized, so that even if the operating conditions fluctuate, there is no problem in the oil supply. It never comes.

Furthermore, the lubricating oil discharged into the cavity 15 along with bubbles accumulates at the bottom of the cavity 15 and is used to lubricate the main bearing 9, so there is no wasteful consumption of the lubricating oil, and the communication hole 18 is an oil hole. 5, so even if the compressor stops, the oil sump 2 and oil hole 5
Also, since the lubricating oil in the empty chamber 15 does not fall into the crank chamber 13, the lubricating oil can be quickly supplied to each bearing at the time of restart.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional refrigerant compressor, Figure 2 is a sectional view showing a conventional refrigerant compressor.
The figure is a cross-sectional view showing essential parts of a refrigerant compressor according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along the - line in FIG. 2. In the figure, 1 is the crankshaft, 2 is the oil sump, 3 is the oil scrubbing mechanism, 4 is the lubricating oil, 5 is the oil hole, 7 is the connecting rod bearing, 8 is the main bearing on the oil sump side, and 9 is the side opposite to the oil sump. The main bearing, 10 is an oil supply hole, 13 is a crank chamber, 15 is an empty chamber, 16 is a communicating pipe, 17 is a pore, and 18 is a communicating hole. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1 Equipped with a crank chamber and an electric element chamber separated by a partition wall, the crankshaft is supported by an oil sump side main bearing provided on the side wall of the crank chamber and a main bearing on the opposite oil sump side provided on the partition wall. The oil hole formed in the axis of the crankshaft has an inner end reaching the position of the main bearing opposite to the oil sump, and an outer end opening into the oil sump formed on the outside of the main shaft on the oil sump side. providing oil supply holes for both main bearings and the connecting rod bearing portion, and providing an empty space in the middle of the main bearing on the side opposite to the oil sump, and communicating this empty space with the oil hole through a communication pipe having a small hole; Furthermore, the refrigerant compressor is characterized in that the empty chamber and the crank chamber are communicated through a communication hole provided in the anti-oil sump main shaft at a position higher than the oil hole.