JPS5848787A - Lubricating oil supplying device for electric compressor - Google Patents

Abstract

PURPOSE:To feed the lubricating oil to bearings by the optimum quantity and improve reliability by a method wherein partitioning walls are provided in a high hydraulic pressure chamber feeding the oil to an auxiliary bearing, a main bearing and a connecting rod so as to enable to change hydraulic pressure applying times for hydraulic pressure chambers for feeding the oil to respective bearings. CONSTITUTION:When a crank shaft 2 is rotated and is shifted to a condition shown by the diagram B, an eccentric hole 8A provided on the crank shaft 2 is communicated with the main bearing and a high hydraulic pressure chamber 9A for the connecting rod through a path 10 and the like, therefore, the hydraulic pressure in said high hydraulic pressure chamber 9A may be kept in constant. On the other hand, the communication between the eccentric hole 8B and a high hydraulic pressure chamber 9B for the auxiliary bearing is interrupted in this case, therefore, the hydraulic pressure in the high hydraulic pressure chamber 9B, communicating with the auxiliary bearing (not shown in the diagram) through the path 15, is dropped. By providing the partitioning walls 16 in the high hydraulic pressure chambers 9A, 9B, feeding the oil to the auxiliary bearing, the main bearing (not shown in the diagram) and the connecting rod 12, in such manner, the amount of the oil fed to respective bearings may be set arbitrarily, the lubricating oil may be fed by the optimum quantity and the reliability may be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubricating oil supply device for a hermetic electric compressor.

To explain a conventional temperature measuring lubricant supply device with reference to FIGS. 1 and 2, 1 is a rotor attached to the crankshaft 2, and 3.4 is a main bearing that supports the upper and lower parts of the crankshaft 2, respectively. 5 is a thrust bearing that supports the end of the crankshaft 1; 6 is a thrust bearing support that holds the thrust bearing 5; 7 is a thrust bearing 6 and a lubricating oil inlet provided in the thrust bearing 5; 8 is a thrust bearing that supports the end of the crankshaft 1; An eccentric hole provided in the crankshaft 2 communicates with the lubricating oil suction lower. 9 is a high hydraulic pressure chamber communicating with the eccentric hole 8; 10 is a passage provided at the center of the crankshaft 1; 11 is a passage provided between the thrust bearing 5 and the thrust bearing support 6 and communicating with the passage 10. , 12 is a connecting rod attached to the crankshaft 1, and 13 is an oil reservoir for storing lubricating oil 14.

In the lubricating oil supply device configured as described above, when the rotor 1 and crankshaft 2 rotate due to the operation of the compressor, the lubricating oil 14 in the oil reservoir 13 is transferred to the thrust bearing support 6 and the lubricating oil suction lower of the thrust shaft 5. When the oil is sucked in, centrifugal force is applied through the eccentric hole 8 of the rank shaft 2, and the oil is supplied to the high oil pressure chamber 9.

A part of the lubricating oil in the high oil pressure chamber 9 is in the passage 17, +1.1
The main bearing 3 and the connecting rod 12 are supplied with oil through the 0-pass, and the oil that lubricates them is swirled in the oil reservoir 13).

Further, a part of the lubricating oil in the high oil pressure chamber 9 is supplied to the sub-bearing 4 through the passage 15.

The conventional lubricating oil supply system flIL described above has the following drawbacks.

(Al) If the cross-sectional area of the sub-bearing side oil supply passage is widened, a large amount of lubricant will be supplied to the sub-bearing, resulting in a shortage of lubricant t for the main bearing and connecting rod.

(Bl) In order to eliminate the above-mentioned drawbacks, if the machining accuracy of the auxiliary bearing working oil supply path is improved to ensure the amount of oil supplied to the main bearing and the connecting rod, the machining cost will increase.

(The amount of oil in the oil supply passage is determined by the ratio of the resistance of the C1 secondary bearing working oil supply, the main bearing side oil supply passage, and the main bearing side oil supply passage, so the machining accuracy of the secondary bearing side oil supply passage is determined. It is difficult to

(Mari) In order to increase the amount of oil supplied, it is necessary to increase the diameter of the flank shaft and increase the oil pressure by centrifugal force. However, with this configuration, the parts become large and costs are high. There is a risk that loss will increase due to an increase in the number of bearing sliding surfaces.

(Due to an increase in the bearing gap due to ICI bearing wear or a decrease in lubricant viscosity due to an increase in oil temperature, the amount of oil leaking from the secondary bearing increases, causing the oil pressure in the high hydraulic chamber to decrease.
There is a risk of an accident because the main bearing is not sufficiently lubricated.

The purpose of the present invention is to eliminate the above-mentioned drawbacks and to improve reliability by lubricating each bearing in the correct quantity and quantity. In the lubricating oil supply device, the lubricating oil sucked from the suction port of the support is supplied to the high hydraulic chamber through the eccentric hole of the crankshaft, and then to the sub bearing, the main bearing, and the connecting rod, respectively. The partition is divided into two by a wall, and one of the high hydraulic pressure chambers is connected to the sub bearing, and the other high hydraulic pressure chamber is connected to the main bearing and the connecting rod. A detailed example will be explained with reference to the drawings.

FIG. 3 is a cross-sectional view corresponding to the X-X cross section of FIG. The high hydraulic pressure chambers are divided into sections, one of which is connected to the main bearing 3 and the connecting rod 11 through passages 17, 11, and 10 shown in Figure 1g1, and the other high hydraulic chamber 9B is connected to the sub bearing through passage 15. 4 are connected to each other.

This embodiment has the above-mentioned configuration, and even when the crankshaft 2 is rotated to shift from the state shown in FIG. 3 to the state shown in FIG. Since the high oil pressure chamber 9A is in communication with the high oil pressure chamber 9A, the oil pressure in the high oil pressure chamber 9A is kept constant as shown by the solid line in FIG. 5(a).

On the other hand, when the crankshaft 2 is moved from the state shown in FIG. 3 to the state shown in FIG. Fifth
Figure (cll) decreases as shown by the solid line.

By setting the partition ICI 6 to an arbitrary position as described above, the oil supply passage 15 to the secondary bearing 4 can be controlled by changing the hydraulic pressure application time of the secondary bearing oil supply high oil pressure chamber 9B.
And, the amount of oil to be supplied to the secondary bearing 4, the main bearing 3 and the connecting rod 12 can be arbitrarily set without being affected by the dimensions and shapes of the oil supply passage 17 and IL 10 to the main bearing 3 and the connecting rod 12. I can do it.

As explained above, according to the present invention, by providing a partition wall in the high hydraulic pressure chamber that supplies oil to the secondary bearing, main bearing, and connecting rod, lubricating oil can be supplied to each of the bearings in just the right amount. It depends on whether it improves reliability or not.゛

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional electric compressor lubricating oil supply device.
FIG. 2 is a sectional view taken along line X-X@ in FIG. Figures (a + and b) are action explanatory diagrams of one embodiment. 3...Main bearing 4...Sub bearing 9A, 9B...
・High hydraulic pressure house 12...Connecting rod 16
・・・Partition wall 2 bq 21st 15″ 4th round 51st (0) - This time

Claims (1)

[Claims] 1 is a dynamic compressor in which lubricating oil is sucked in from the thrust bearing provided at the end of the crankshaft and the suction port of the thrust shaft pot support and is supplied to the high hydraulic pressure chamber through the eccentric hole of the crankshaft. later,
In the lubricating oil supply device that supplies lubricating oil to the secondary bearing, main bearing, and connecting rod, the high hydraulic pressure chamber is divided into 92 parts by a partition wall, one of the high hydraulic pressure chambers is used as the secondary bearing, and the other high hydraulic pressure chamber is used as the main bearing. and a connecting rod, respectively. 2. The electric pressure llA1m according to claim 1, characterized in that the high pressure chamber for lubricating the upper pi sub-bearing is formed smaller than the high hydraulic chamber for lubricating the main bearing and connecting rod.
lubricating oil supply device.