JPS626312Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Technical field This invention relates to the improvement of oil supply equipment for rotary compressors.
In particular, the present invention relates to an oil supply device that can satisfactorily lubricate between a rotating shaft and a roller, and between a rotating shaft and a bearing.

(b) Prior art As shown in FIG.
is sucked through the oil pick-up 18 through a suction hole 17' that is drilled through the rotary shaft 5' in the axial direction, and the oil is sucked through the oil supply holes 19, 20, 21 that are provided in communication with this suction hole 17'. After lubricating between the bearings 13' and 14 of the rotary compression element 4, the roller 8, and the rotary shaft 5', the lubricant is returned to the bottom of the closed container 3 from which it flows out from the upper end of the rotary shaft 5'. However, the above configuration has the following problems.

The surface pressure that the rotating shaft 5' receives between the rotating shaft 5 and the bearing parts 13' and 14, and between the eccentric part 5a' of the rotating shaft 5' and the roller 8 is as shown in FIG. Varies depending on the rotation angle. That is, at position A immediately before the discharge port 24 is opened, the pressure on the high pressure chamber 11 side in the cylinder 7 reaches its maximum, and the surface pressure that the eccentric part 5a receives on the roller 8 at the contact surface between the eccentric part 5a' and the roller 8 reaches its maximum. Therefore, although a large amount of lubricating oil is required at this time, the lubricating oil 2 supplied from the oil supply holes 19, 20, and 21 is a constant quantity, and especially in the part B shown in FIG. The oil film between the eccentric portion 5a' and the roller 8 is easily broken, causing wear on the eccentric portion 5a'.

In addition, the lubricating oil 2 stored in the inner bottom of the sealed container 3
When the compressor is operating, it mixes with high-pressure refrigerant and becomes gaseous, and since the gas escapes from the upper end of the suction hole 17' drilled through the rotating shaft 5', the lubricating oil 2 is also released from the upper end. A large amount of oil flows out from the oil supply holes 19, 20, and 21, and the amount of oil supplied to the bearing portion 13' and the roller 8 decreases, causing wear of the rotating shaft 5'.

On the other hand, if the suction hole 17'' of the rotating shaft 5'' is not penetrated as shown in FIG.
The amount of oil supplied at 20 and 21 increases, but there is a possibility that it becomes more than necessary, and this surplus lubricating oil 2 flows into the low pressure chamber 10, reducing the amount of refrigerant gas sucked and causing oil compression, etc. There is a risk that the performance of the machine will be significantly reduced.

(c) Disclosure of the invention The present invention provides a rotary shaft with a bottomed suction hole, an oil supply hole that communicates with the suction hole and supplies oil to the bearing and the roller, and one end of which is opened in the suction hole. At the same time, the other end is provided with a communication hole that opens appropriately to the oil discharge hole formed in the bearing part depending on the rotation angle of the rotating shaft, and the pressure in the suction hole is adjusted to increase the surface pressure applied to the rotating shaft. By increasing the amount of oil supplied between the bearings, rollers, and rotating shaft at rotation angles, and decreasing the amount of oil supplied at rotation angles where surface pressure is small, an efficient oil supply device can be obtained without causing wear to the rotating shaft. It is something.

(d) Embodiments of the invention This invention has been developed in view of the problems of the background art described above, and will be described below based on the embodiments shown in FIGS. 5 to 7.

1 is a sealed container 3 in which lubricating oil 2 is stored at the bottom;
A rotary compression element 4 provided inside the airtight container 3 and an electric element 6 having a rotary shaft 5 that drives the rotary compression element 4 and sucks the lubricating oil 2.
It is a rotary compressor consisting of. The rotary compression element 4 includes a cylinder 7, a roller 8 that rotates eccentrically within the cylinder 7 by an eccentric portion 5a of a rotating shaft 5,
A sliding vane 12 is constantly pressed against the roller 8 by an elastic means 9 to divide the inside of the cylinder 7 into a low pressure chamber 10 and a high pressure chamber 11, and a bearing portion 13 of the rotating shaft 5 closes the opening of the cylinder 7. , 14, and a lower frame 16. Reference numeral 17 denotes a bottomed suction hole provided in the rotary shaft 5, which sucks the lubricating oil 2 stored at the bottom of the closed container 3 through the oil pickup 18, and is also bored in the eccentric portion 5a of the rotary shaft 5. The lubricating oil 2 is supplied to the bearing parts 13, 1 from the oil supply holes 19, 20, 21.
4 and between the roller 8 and the eccentric portion 5a.

Reference numeral 22 denotes a communication hole provided in the rotary shaft 5 with one end open so as to be substantially orthogonal to the suction hole 17, and the other end is an oil communication hole provided in the bearing portion 13 of the upper frame 15. The discharge hole 23 is configured to open appropriately depending on the rotation angle of the rotating shaft 5. That is, the position A immediately before the discharge port 24 opens as shown in FIG.
In this case, the communication hole 22 is closed, and at the position C just before the suction port 25 is closed, the communication hole 22 is opened.

In the rotary compressor oil supply device configured in this way, the communication hole 22 has one end opened to the bottomed suction hole 17 and the other end opened to the oil discharge hole 23 of the bearing part 13 to the rotary shaft 5. 6, the rotation angle is the position A immediately before the discharge port 24 opens as shown in FIG. In order to close the suction port 25, the amount of lubricating oil 2 supplied from the oil supply holes 19, 20, and 21 is increased by increasing the pressure inside the suction hole 17, and at the same time, the rotation angle is the position immediately before the suction port 25 is blocked as shown in FIG. C, that is, at the rotation angle where the surface pressure that the rotating shaft 5 receives on the roller 8 is the smallest, the oil supply holes 19 and 2 are opened as shown in FIG. 7 to release gas and reduce the pressure in the suction hole 17.
The amount of lubricating oil 2 supplied from 0 and 21 can be reduced, and between the rotating shaft 5 and the roller 8 and between the rotating shaft 5
The present invention provides an oil supply device for a rotary compressor that can satisfactorily lubricate between the bearing portion 13 and the bearing portion 13 with a simple configuration.

(e) Effects of the device As described above, the present invention includes a suction hole that is closed at the top on the rotating shaft that sucks lubricating oil, an oil supply hole that communicates with the suction hole to supply oil to the bearings and rollers, and A communication hole is provided above the oil supply hole to communicate the suction hole with the inner peripheral surface of the bearing part, and an oil discharge hole is provided in the bearing part to communicate the space inside the closed container with the outer peripheral surface of the rotating shaft. Since the communication hole and the oil discharge hole are configured to communicate with each other at a rotational position where the surface pressure applied to the rotating shaft is small, the gas pressure in the suction hole can be adjusted to reduce the surface pressure applied to the rotating shaft. More lubricating oil can be supplied at the rotational position where the rotating shaft is larger, and a smaller amount of lubricating oil can be supplied between the bearing and the rotating shaft and the roller at the rotating position where the surface pressure on the rotating shaft is smaller.A good lubrication effect can be obtained with a simple configuration. The present invention provides an oil supply device for a rotary compressor.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of the main part of a conventional rotary compressor, Fig. 2 is a sectional view taken along the A-A' section of Fig. 1, and Fig. 3 is a front view of the rotating shaft of another conventional example. , FIG. 4 is a longitudinal sectional view of a rotary compressor showing an embodiment of the present invention, and FIGS. 5 and 6 are sectional views taken along the line B-B' in FIG. 4. 1... Rotary compressor, 2... Lubricating oil, 3... Sealed container, 4... Rotating compression element, 5... Rotating shaft, 6
... Electric element, 8 ... Roller, 13, 14 ... Bearing section, 17 ... Suction hole, 19, 20, 21 ... Oil supply hole, 22 ... Communication hole, 23 ... Oil discharge hole.

Claims (1)

[Scope of utility model registration request] A rotating device consisting of a closed container storing lubricating oil at the bottom, a rotary compression element provided inside the closed container, and an electric element having a rotating shaft that drives the rotary compression element and sucks the lubricating oil. In the compressor, the rotary shaft has a suction hole whose upper part is closed, an oil supply hole that communicates with the suction hole and supplies oil to the bearing and the rollers, and an oil supply hole that connects the suction hole and the bearing above the oil supply hole. A communication hole that communicates with the inner circumferential surface is provided, and an oil discharge hole that communicates between the space inside the sealed container and the outer circumference of the rotating shaft is provided in the bearing part, and the communication hole and the oil discharge hole are connected to each other. An oil supply device for a rotary compressor, characterized in that the oil supply device for a rotary compressor is configured to communicate at a rotational position where surface pressure applied to the rotating shaft is reduced.