JPS6146233Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a rotary compressor that is incorporated into an air conditioner, a refrigerator, etc., and is particularly concerned with a rotary compressor with an improved oil supply device. It is about tsusa.

(Problems to be solved by conventional technology and ideas) Conventionally, as an oil supply system for this type of rotary compressor, a blade chamber is formed in a sealed manner behind the blades of the cylinder, and an oil suction hole and an oil suction hole are formed in this blade chamber. It is known that an oil discharge hole is formed and an oil supply path is connected to the oil discharge hole for introducing lubricating oil to the bearing portion of the compression device. That is, when the blade, which reciprocates as the crankshaft rotates, moves in the direction of expanding the volume of the blade chamber, oil is sucked into the blade chamber from the oil suction hole, and conversely, the blade reduces the volume of the blade chamber. When the blade moves in that direction, the oil in the blade chamber is discharged from the oil discharge hole into the oil supply path. However, the conventional oil supply device requires a check valve in the oil suction hole and the oil discharge hole (or oil supply path), which has the disadvantage of complicating the structure and increasing cost.

Therefore, as shown in Japanese Patent Application Laid-open No. 56-34998, an oil suction hole and an oil discharge hole are bored in the blade chamber, and a gap is placed on the imaginary axis of the oil discharge hole to open the opening of the oil supply pipe. It has been proposed that a refueling device is constructed without using the check valve. That is, if the conventional technology described in the above publication is explained with reference to FIG.
1 is a sealed case of a rotary compressor, and a cylinder 2 is disposed within the case 1 in which oil is stored at the bottom.

A main bearing 3 is fixed to the right side of the cylinder 2, and a sub bearing 4 is fixed to the left side of the cylinder 2.
is fixed. A crankshaft 5 is supported by both bearings 3 and 4.

Further, a cylindrical roller 6 is fitted eccentrically to the outer periphery of the crankshaft 5 located within the cylinder 2.

Further, at the center of the crankshaft 5 is a shaft hole 7 extending from the left side of the crankshaft 5 to the main bearing 3.
is provided. Further, the crankshaft 5 is provided with three horizontal holes 7a that communicate with the shaft hole 7.

On the other hand, a sealed blade chamber 10 is provided at the bottom of the cylinder 2 in which a blade 11 that can freely protrude into the cylinder 2 is housed.

The blade 11 is constantly urged toward the center within the cylinder 2 by a coil spring 12 disposed in a blade chamber 10 formed below the blade 11.

Furthermore, an oil suction hole 8 and an oil discharge hole 9 are bored in the blade chamber 10, and the other end opening of the oil supply pipe 13, one end of which is fixed to the sub-bearing 4, is located in the virtual position of the oil discharge hole 9. They are arranged with a gap on the axis. In the figure, 16 is a pulp cover attached to the main bearing 3.

However, in the above conventional system, the oil sucked into the blade chamber 10 from the oil suction hole 8 and the oil discharge hole 9 is discharged from the oil discharge hole 9 to the oil supply pipe 13, and also from the oil suction hole 8 to the case 1. It is discharged into the oil at the bottom, and as a result, the oil supply pipe 13
The amount of oil supplied to the bearing portion was small, and the ratio of the amount of oil supplied to the bearing portion to the displacement volume of the blade 11 (the product of the cross-sectional area of the blade and the blade stroke) was small. Therefore, a relatively large rotary compressor with a large displacement volume of the blades can provide a sufficient amount of oil supply, but a small rotary compressor with a small displacement volume of the blades has the problem of insufficient oil supply amount.

This invention was made based on the above circumstances,
It is an object of the present invention to provide a rotary compressor capable of sufficiently lubricating even a small rotary compressor with a small displacement volume of blades without using a check valve.

[Structure of the invention] (Means for solving the problem) The invention consists of a cylinder disposed in a case in which oil is stored at the bottom, a main bearing and a sub-bearing fixed to both sides of the cylinder,
A crankshaft supported by both of the bearings and having a shaft hole in the shaft center, an eccentrically rotating roller provided on the outer periphery of the crankshaft within the cylinder, and a blade that moves forward and backward in contact with the outer peripheral surface of the roller. In a rotary compressor configured to suck and compress refrigerant, an oil suction hole and an oil discharge hole are formed in a sealed blade chamber that accommodates the blades, and a connection between the oil discharge hole and the crankshaft is provided. The crankshaft has an oil supply path communicating with the shaft hole, a notch formed in the crankshaft so as to communicate the shaft hole with the outer peripheral surface, and a closing plate provided to cover the end of the crankshaft. , the notch communicates with the oil supply passage when the blade moves in a direction to reduce the volume of the blade chamber in synchronization with the movement of the blade, and does not communicate with the oil supply passage when the blade moves in a direction to expand the volume of the blade chamber. It was formed in

(Function) In the rotary compressor of the present invention configured as described above, when the blade moves in a direction to expand the volume of the blade chamber, the opening of the oil supply passage on the shaft hole side of the crankshaft is brought into contact with the outer peripheral surface of the crankshaft. This prevents oil from flowing back into the oil supply path.

Therefore, when the blade moves in a direction to reduce the volume of the blade chamber, the oil supply passage and the shaft hole of the crankshaft communicate with each other, and most of the oil supplied from the blade chamber to the oil supply passage is supplied to the shaft hole of the crankshaft. be done. Therefore, the ratio of the amount of oil supplied to the shaft hole to the displacement volume of the blade increases. Therefore, even a small rotary compressor with a small displacement volume of the blades can be sufficiently lubricated without using a check valve.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

This embodiment is shown in FIGS. 2 and 3, and the same components as the conventional example are given the same reference numerals and explanations are omitted, and only the structures different from the conventional example will be explained.

In FIG. 2, in the lower part of the cylinder 2, there is a blade chamber 10 that accommodates a blade 11 that can freely protrude into the cylinder 2, and a lower flange part 20 formed in the thickness of the sub-bearing 4 that supports the crankshaft 5.
and the lower flange portion 23 of the main bearing 3.

Further, an oil suction hole 22 is provided in a lower portion of the lower flange portion 20 that is immersed in oil stored at the bottom of the case 1 . This oil suction hole includes a first hole 22a that opens into the oil at the bottom of the case 1;
It is formed of a second hole 22b communicating with the first hole 22a and opening into the blade chamber 10, and the second hole 22b also serves as an oil discharge hole.

Further, the lower flange portion 20 of the sub-bearing 4 is provided with an oil supply hole 21 having one end opening communicating with the oil discharge hole 22b and the other end opening communicating with the shaft hole 7 of the crankshaft.

On the other hand, a notch 2 is formed in the left end of the crankshaft 5 so as to communicate the shaft hole 7 with the outer peripheral surface.
5 is provided. This notch 25 communicates with the opening of the oil supply hole 21 when the blade 11 moves in a direction to reduce the volume of the blade chamber 10 in synchronization with the movement of the blade 11, and the blade 11 expands the volume of the blade chamber 10. It is formed so that it does not communicate with the opening of the oil supply hole 21 when the oil supply hole 21 moves in that direction.

Further, a closing plate 26 for closing the shaft hole 7 and the notch 25 is attached to the left end portion of the sub-bearing 4.

In a rotary compressor having such a configuration, when the crankshaft 5 is driven to eccentrically rotate the roller 6 in the cylinder 2, the blade 11 that is in pressure contact with the roller 6 moves inside the blade chamber 10 due to the eccentric movement of the roller 6. A reciprocating movement occurs in the blade chamber 10, and the volume inside the blade chamber 10 changes.

The change in the volume of the blade chamber 10 is used as an oil pump.

That is, as shown in FIG. 3, when the blade 11 moves upward within the blade chamber 10 in a direction to expand the volume within the blade chamber 10 and begins the movement of the oil suction stroke, the axis of the crankshaft in the oil supply hole 21 moves upward. One end opening on the hole 7 side is closed by the outer peripheral surface of the crankshaft 5, and oil stored at the bottom of the case 1 is sucked in from the oil suction hole 22 as shown by arrow a and flows into the blade chamber 10.

Then, when the blade 11 moves downward within the blade chamber 10 in a direction to reduce the volume within the blade chamber 10 and begins the movement of the oil discharge stroke, the axis of the crankshaft of the oil supply hole 21 is moved as shown in FIG. The opening at one end on the hole 7 side aligns with the notch 25 provided in the crankshaft 5 and becomes open, and the oil filling the blade chamber 10 flows from the oil discharge hole 22b through the oil supply hole 21 to the crankshaft 5. Enter notch 25. The oil flows into the shaft hole 7 communicating with the notch 25 as shown by arrow b in FIG. 2, and is carried from the shaft hole 7 to the sliding portion of the crankshaft 5.

Next, the blade 11 moves in the direction of expanding the volume inside the blade chamber 10 and starts the movement of the oil suction stroke, but at this time, one end opening of the oil supply hole 21 on the side of the shaft hole 7 of the crankshaft is connected to the crankshaft 5. Since the oil supply hole 21 is blocked by the outer peripheral surface of the oil supply hole 21, backflow of oil in the oil supply hole 21 is prevented. Therefore, most of the oil supplied from the blade chamber 10 to the oil supply hole 21 is supplied to the shaft hole 7 of the crankshaft 5. Therefore, the ratio of the amount of oil supplied to the shaft hole 7 with respect to the displacement volume of the blades 11 becomes large, and even a small rotary compressor with a small displacement volume of the blades can be sufficiently supplied with oil. Furthermore, since there is no need to use a check valve, the structure is simple and an increase in the number of parts and cost can be prevented.

In this embodiment, the oil discharge hole 22b and the notch 25 of the crankshaft 5 are communicated through the oil supply hole 21 provided in the thick lower flange portion 20 of the sub-bearing 4. Of course, they may be communicated. Furthermore, the oil supply hole may be formed on the main bearing 3 side.

(Effects of the invention) As explained above, the rotary compressor of the invention has an oil suction hole and an oil discharge hole bored in the sealed blade chamber that accommodates the blades provided in the cylinder, and the oil discharge hole. An oil supply path that communicates the hole with the crankshaft hole, a notch formed in the crankshaft so as to communicate the shaft hole with the outer peripheral surface, and a closing plate provided to cover the end of the crankshaft. The notch is configured to communicate with the oil supply passage in synchronization with the movement of the blade, so that when the blade moves in a direction that increases the volume of the blade chamber, one end of the oil supply passage on the side of the shaft hole of the crankshaft is opened. is blocked by the outer peripheral surface of the crankshaft to prevent oil from flowing back into the blade chamber. Therefore, the ratio of the amount of oil supplied to the bearing relative to the displacement volume of the blades becomes large, and even a small rotary compressor with a small displacement volume of the blades can be sufficiently supplied with oil. Furthermore, since there is no need to use a check valve, the structure is simple and an increase in the number of parts and cost can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of parts of a conventional rotary compressor, Fig. 2 is a partial longitudinal sectional view of the rotary compressor according to the present invention showing a state in which oil is supplied to the crankshaft, and Fig. 3 is a partial longitudinal sectional view of the rotary compressor according to the present invention. FIG. 3 is a partial vertical cross-sectional view showing a state in which oil is sucked into the blade chamber. 1... Case, 2... Cylinder, 3... Main bearing, 4... Sub bearing, 5... Crankshaft, 6... Roller, 10... Blade chamber, 1
1...Blade, 21...Oil supply hole, 22...Oil suction hole, 25...Notch.

Claims (1)

[Scope of utility model registration request] a cylinder disposed in a case with oil stored at the bottom; a main bearing and sub bearings fixed to both sides of the cylinder; a crankshaft supported by both the bearings and having a shaft hole in the shaft center; In the rotary compressor, the refrigerant is sucked and compressed by an eccentrically rotating roller provided on the outer periphery of the crankshaft in the cylinder, and a blade that moves back and forth in contact with the outer periphery of the roller. An oil suction hole and an oil discharge hole drilled in a sealed blade chamber that accommodates the blade, an oil supply path that communicates the oil discharge hole and the shaft hole of the crankshaft, and an oil supply path that communicates with the shaft hole and the outer periphery of the crankshaft. a notch formed to communicate with the crankshaft, and a closing plate provided to cover the end of the crankshaft. A rotary compressor characterized in that the rotary compressor is formed so that it communicates with the oil supply passage when the blade moves in the direction of reducing the volume of the blade chamber, but does not communicate with the oil supply passage when the blade moves in the direction of expanding the volume of the blade chamber.