JP3007746B2 - Rotary compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor, and more particularly to a hermetic rotary compressor for compressing a refrigerant gas in a refrigerating apparatus or an air conditioner.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing a conventional rotary compressor disclosed in, for example, JP-A-64-73190. In FIG. 5, reference numeral 1 denotes a hermetic container forming an outer shell of a rotary compressor, 2 denotes a stator inserted in the hermetic container 1, and 3 denotes a rotor located at a predetermined space in a central space of the stator 2. ,
Reference numeral 4 denotes an electric element including the stator 2 and the rotor 3. 6
Reference numeral denotes a rotary shaft press-fitted into the rotor 3, and reference numeral 7 denotes a crankshaft integrally formed with the rotor 3. Reference numeral 8 denotes a main bearing that supports the rotating shaft 6, and 9 denotes an end bearing that supports the rotating shaft 6. Reference numeral 10 denotes a cylinder inserted into the closed container 1, and a main bearing 8 and an end bearing 9 are fixed to two surfaces on the left and right, respectively. Reference numeral 11 denotes a rolling piston fitted to the crankshaft 7 of the rotating shaft 6, which is movably disposed on the inner wall surface of the central space in the cylinder 10 in line contact. The rolling piston 11 is also in contact with a vane (not shown) disposed in the cylinder 10. Reference numeral 12 denotes a compression element including the main bearing 8, the end bearing 9, the cylinder 10, and the rolling piston 11. Reference numeral 13 denotes a suction / compression chamber formed in a gap between the cylinder 10 and the rolling piston 11, and is divided into a high-pressure compression chamber and a low-pressure suction chamber by a vane (not shown) provided in the cylinder 10. ing. The eccentric rotation of the rolling piston 11 continuously repeats a series of suction / compression steps that sequentially transition from a step of sucking a medium to be compressed such as refrigerant gas to a step of compressing the medium.

[0003] The compressed gas passes through a discharge valve (not shown), a partition plate 16 and a discharge muffler 17 together with the lubricating oil of the sliding portion, and is discharged in the direction of an arrow in the sealed container 1 and flows through the discharge pipe 15. Is sent to the refrigeration circuit.

[0004]

Since the conventional rotary compressor is constructed as described above, the lubricating oil in the sliding portion is stored in the discharge valve chamber and in the discharge muffler 17, and a large amount of oil is stored together with the compressed gas. Is discharged, and since the discharge port to be discharged and the discharge pipe 15 are in the same direction, sufficient oil separation cannot be performed and lubricating oil is sent out from the discharge pipe 15 to the refrigeration circuit, and the heat exchange rate in the refrigeration circuit is reduced. Or the amount of lubricating oil required in the compressor cannot be satisfied, resulting in a problem that the rotating shaft and the bearing are seized.

[0005] The present invention has been made to solve the above problems, and has as its object to perform sufficient oil separation in a rotary compressor.

[0006]

According to a rotary compressor according to the present invention, an inlet opening of a gas passage of a cylinder is formed in a cylindrical shape.
Installed below the horizontal plane that includes the cylindrical centerline of the closed container
When the gas flow path of the cylinder is
The normal direction to the side of the closed container connecting the flow path entrance opening
It is directed downward.

[0007]

[0008]

The rotary compressor according to the present invention generates compressed gas.
Below the horizontal direction and normal to the side of the closed container
The cylinder is provided with a gas passage that discharges downward,
The mixture of compressed gas and lubricating oil that has been discharged
It is separated from the separating action due to collision with. Also closed container
Collision due to lower than normal direction to side
Afterwards, toward the top of the compressor where the discharge pipe is located
Into the refrigeration circuit because the amount of lubricating oil scattered is reduced.
The amount of circulating oil is reduced.

[0009]

[0010]

[Embodiment 1] An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view showing a main part cross section of the rotary compressor. In the drawings, reference numerals 1 to 17 denote the same or corresponding components as those of the conventional example. FIG. 2 is a front view of the end bearing 9 on the right side, where 9a is a discharge valve, and 9b is a discharge valve chamber.
The center is a front view of the partition plate 16 and 16a is the end bearing 9
Is an oil drain hole communicating with the lowermost part of the discharge valve chamber 9b. The left side is the front part of the discharge muffler 17, and 17 a is an oil drain hole communicating with the inside of the sealed container 1 at a position below the oil drain hole 16 a of the partition plate 16. FIG. 3 is a front view of the compression element viewed from the direction of arrow A in FIG. Reference numeral 10a denotes a compressed gas passage provided in the cylinder 10, and is provided in the closed container 1 so as to be discharged below the horizontal direction and below the normal to the closed container. FIG. 4 is a graph showing the relationship between the discharge direction θ and the amount of oil circulation in the refrigeration circuit.

Since this embodiment is configured as described above, the lubricating oil of the sliding portion is discharged together with the compressed gas and stored in the hatched portion of the discharge valve chamber 9b. This oil passes through the hole 16a of the partition plate 16 communicating with the lowermost part of the discharge valve chamber 9b, and flows into the discharge muffler 17. The oil stored in the discharge muffler 17 is discharged into the closed container 1 through a hole 17a provided in the discharge muffler 17. Therefore, the amount of lubricating oil discharged together with the compressed gas from the discharge valve chamber 9b and the discharge muffler 17 decreases.

Further, since the cylinder is provided with a gas passage for discharging the compressed gas below the horizontal direction and below the normal direction to the side surface of the closed container 1, the mixture of the discharged compressed gas and the lubricating oil is supplied to the closed container. It is separated by the separating action due to the collision with one side wall surface. In addition, since the side of the closed container 1 is located below the normal direction, after the collision, the discharge pipe 1
Since the amount of lubricating oil scattered toward the upper part of the compressor, which is the position where 5 is provided, is reduced, the amount of oil circulating into the refrigeration circuit is reduced. Also, the relationship between the discharge direction and the amount of oil circulation in the refrigeration circuit obtained in the experiment of FIG. 4 shows that the larger the angle θ with the normal line, the smaller the amount of oil circulation in the refrigeration circuit.

[0013]

As described above, according to the present invention, the compression
Gas normal below the horizontal direction to the side of the sealed container below the horizontal direction
The cylinder has a gas flow path that discharges downward from the direction
The mixture of compressed gas and lubricating oil
Separated by the separation effect due to collision with the side wall surface, after collision,
Lubricate upwards the compressor where the discharge pipe is located
Oil spills into the refrigeration circuit due to reduced amount of oil splattered
The amount of circulating oil is reduced.

[0014]

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a rotary compressor according to an embodiment of the present invention.

FIG. 2 is a front view of an end bearing, a partition plate, and a discharge muffler of the rotary compressor according to one embodiment of the present invention.

FIG. 3 is a front view of a compression element portion of the rotary compressor according to one embodiment of the present invention.

FIG. 4 is a diagram showing a relationship between a discharge gas blowing angle and an oil circulation amount of the rotary compressor according to one embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a conventional rotary compressor.

[Explanation of symbols]

 9 End bearing 9b Discharge valve chamber 16 Partition plate 16a Oil drain hole (first) 17 Discharge muffler 17a Oil drain hole (second) 10 Cylinder 10a Compressed gas flow path

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F04C 23/00-29/10 331 F04C 18/356

Claims (1)

(57) [Claims] (1) A container housed in a horizontally closed cylindrical container.
Electric element and compression element, and cylinder of the compression element
And the compressed gas compressed by the rolling piston
A gas passage provided in the cylinder for discharging into the closed container;
And at one end of the cylindrical closed container, above the center
To open the compressed gas inside the closed container
A rotary compressor provided with an opening , wherein an inlet opening of the gas flow path of the cylinder is sealed in a cylindrical shape.
Install below the horizontal plane containing the cylindrical center line of the container.
The gas flow path of the cylinder is located one point before the center line in the cylinder direction.
The side of the closed vessel, which connects the gas flow path inlet opening,
Characterized by turning downward from the normal direction
Type compressor.