JPS6211357Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Purpose of the invention] (Field of industrial application) The present invention relates to a horizontal rotary compressor that is incorporated into an air conditioner, a refrigerator, etc., and particularly relates to a horizontal rotary compressor with an improved oil supply device. . (Problems to be solved by conventional technology and ideas) Conventionally, as an oil supply system for this type of horizontal rotary compressor, a blade chamber is formed in a sealed manner behind the blades of the compressor, and an oil suction hole is provided in this blade chamber. It is also known that an oil discharge hole is formed and an oil supply path is connected to the oil discharge hole to lead lubricating oil to the bearing portion of the compression device. That is, when the blade, which reciprocates as the rotating shaft rotates, moves in a direction to expand the volume of the blade chamber, lubricating oil is sucked into the blade chamber from the oil suction hole, and conversely, the blade expands the volume of the blade chamber. When the blade moves in the direction of contraction, the lubricating oil in the blade chamber is discharged from the oil discharge hole to the oil supply path. However, the conventional oil supply device requires check valves 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 oil supply pipe. It has been proposed that a refueling device is constructed without using the check valve. However, in the conventional device described in this publication, the lubricating oil sucked into the blade chamber from the oil suction hole and the oil discharge hole is discharged from the oil discharge hole to the oil supply pipe, and also from the oil suction hole to the lubricating oil reservoir. As a result,
The amount of lubricating oil supplied to the oil supply pipe was small, and the ratio of the amount of lubricating oil supplied to the bearing to the displacement volume of the blade (the product of the cross-sectional area of the blade and the blade stroke) was small. Therefore, a relatively large horizontal rotary compressor with a large blade displacement volume can provide a sufficient amount of oil supply, but a small horizontal rotary compressor with a small blade displacement volume may have the problem of insufficient oil supply volume. Ta. This invention was made based on the above circumstances,
It is an object of the present invention to provide a horizontal rotary compressor capable of sufficiently lubricating even a small horizontal rotary compressor with a small displacement volume of blades without using a check valve. [Structure of the invention] (Means for solving the problems) The present invention provides a horizontal rotary compressor in which a compressor is housed with the rotating shaft horizontally in a casing with a lubricating oil reservoir formed at the bottom. Lubricating oil is supplied to a blade chamber that is hermetically formed behind the blades of the compression device that reciprocate with rotation, which also serves as suction and discharge for lubricating oil, and leads the lubricating oil to the bearing portion of the compression device. Only a through-hole for supplying the lubricating oil is drilled, and a communication portion communicating with the lubricating oil reservoir at the bottom of the casing is formed in the oil supply path. (Function) In the horizontal rotary compressor of the present invention configured as described above, when the blade moves in the direction of expanding the volume of the blade chamber, the lubricating oil in the oil supply passage and the communication portion formed in the oil supply passage are removed. The lubricating oil in the lubricating oil reservoir at the bottom of the casing is sucked into the blade chamber through the through hole. Next, when the blade moves in a direction to reduce the volume of the blade chamber, the lubricating oil in the blade chamber is discharged only from the through hole and into the oil supply path. At this time, the flow rate of the lubricating oil in the oil supply path prevents the lubricant from being discharged from the communication portion of the oil supply path to the lubricant oil reservoir. Therefore, compared to the amount of lubricant oil in the oil supply path sucked into the blade chamber (reverse flow rate), the amount of lubricant oil supplied into the oil path is larger, and the compression device Oil is supplied to the bearings. Compared to the conventional system disclosed in the above-mentioned publication, the amount of lubricant oil in the oil supply passage sucked into the blade chamber (reverse flow rate) increases; The increase in the amount of oil is larger, and the ratio of the amount of oil supplied to the bearing to the displacement volume of the blade becomes larger. Therefore, even a small horizontal rotary compressor with a small displacement volume of the blades can be sufficiently lubricated without using a check valve. (Embodiment) Next, a horizontal rotary compressor according to an embodiment of the present invention will be described in detail with reference to the drawings.
In FIG. 1, an electric element 2 and a compression device 3 are housed in a casing 1 with a rotating shaft 4 horizontally arranged, and a lubricating oil 5 is stored in a lubricating oil reservoir at the bottom of the casing 1. The electric element 2 is a casing 1
It is composed of a stator 2a fixed to an inner wall and a rotor 2b fixed to the rotating shaft 4. on the other hand,
The compression device 3 includes a cylinder 6 and this cylinder 6.
A cylinder chamber 6a is formed by a main bearing 7 and a sub-bearing 8 which cover both end surfaces and pivotally support the rotating shaft 4. Further, an eccentric portion 4a of the rotary shaft 4 is located in the cylinder chamber 6a and is provided to pass through the cylinder chamber 6a, and a roller 9 is fitted into the eccentric portion 4a. Further, a blade 10 is provided in a groove formed in the radial direction of the cylinder 6 so as to be able to reciprocate,
This blade 10 is configured by a spring 11 so that its tip always comes into contact with the outer peripheral surface of the roller 9 eccentrically rotating within the cylinder chamber 6a. A blade chamber 12 is formed in a sealed manner behind the blade 10. In the blade chamber 12, as shown in an enlarged view in FIG. 2, lubricating oil is supplied to an oil supply pipe 13 which serves both to suck and discharge lubricating oil and forms an oil supply path for guiding the lubricating oil to the bearing portion 8a of the compression device 3. Only the through hole 12a for supplying the water is drilled. This oil supply pipe 13 has the through hole 12a.
An opening 13a communicating with the lubricating oil 5 at the bottom of the casing 1 is formed at a position close to the opening 13a. Next, the operation of the above embodiment will be explained. By energizing the electric element 2, the rotor 2b and the rotating shaft 4 rotate together. Accordingly, the roller 9 fitted into the eccentric portion 4a of the rotating shaft 4 moves into the cylinder chamber 6a.
The well-known compression action is performed by eccentrically rotating the inside.
On the other hand, due to the eccentric rotation of the roller 9, the roller 9
The blade 10 that is in contact with the outer circumferential surface of the oil reciprocatingly moves to perform a lubricating action. That is, when the blade 10 moves in the direction of enlarging the volume of the blade chamber 12 (in the solid line direction in FIG. 2), as shown by the solid line in FIG. The lubricating oil in the lubricating oil reservoir at the bottom of the casing 1 is sucked into the blade chamber 12 through the through hole 12a. Next, when the blade 10 moves in the direction of reducing the volume inside the blade chamber 12 (in the direction of the broken line in FIG. 2), the lubricating oil in the blade chamber 12 flows from the through hole 12a as shown by the broken line in FIG. is discharged into the oil supply pipe 13. At this time, oil supply pipe 1
Due to the flow rate of the lubricating oil passing through the opening 13
An ejector action (suction action) occurs in part a, preventing the lubricating oil from being discharged into the lubricating oil reservoir at the bottom of casing 1, and vice versa.

[Effect of idea]

As explained above, in the present invention, only a through-hole is bored in the blade chamber, which also serves as suction and discharge of lubricating oil, and supplies the lubricating oil to the oil supply path that leads the lubricating oil to the bearing part of the compression device. Since the communication portion that communicates with the lubricating oil reservoir at the bottom of the casing is formed in the oil supply path, the ratio of the amount of oil supplied to the displacement volume of the blade can be increased, and the amount of oil supplied can be increased. Therefore, sufficient oil supply can be achieved even in a small horizontal rotary compressor whose blades have a small displacement volume. Further, 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 longitudinal sectional view of a horizontal rotary compressor according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main part of Fig. 1, and Fig. 3 is a section from the blade chamber wall to the center of the oil supply pipe opening. A characteristic diagram showing the relationship between the distance l and the amount of oil supplied is shown. DESCRIPTION OF SYMBOLS 1... Casing, 3... Compression device, 4... Rotating shaft, 5... Lubricating oil, 10... Blade, 12...
...Blade chamber, 12a...Through hole, 13...Oil supply pipe, 13a...Opening.

Claims (1)

[Scope of utility model registration request] In a horizontal rotary compressor in which a compressor is housed with a rotating shaft horizontally in a casing with a lubricating oil reservoir formed at the bottom, the rotary compressor is formed hermetically behind the blades of the compressor that reciprocate as the rotating shaft rotates. A through-hole is formed in the blade chamber in which the lubricating oil is sucked and discharged, and the through-hole supplies the lubricating oil to an oil supply path that leads the lubricant to the bearing part of the compressor. A horizontal rotary compressor characterized by forming a communication part that communicates with a lubricating oil reservoir at the bottom.