JP2509386Y2 - Rotary compressor - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a rotary compressor, and more particularly to a rotary compressor suitable for reducing noise.

[Prior art]

FIG. 4 is a cross-sectional view of a rotary compressor known as Japanese Utility Model Publication No. 54-173314, a so-called rotary compressor, in which a rotor 2 and a stator forming a motor portion inside a hermetically sealed container denoted by reference numeral 1 are shown. 3 and a compressor portion formed by the cylinder 4, the rotor 5, and the like are housed. And
The motor part and the compressor part are directly connected to a crankshaft 6 which is rotatably supported by an upper bearing 7 and a lower bearing 8, and an eccentric part 6A of the crankshaft 6 is provided.
A rotor 5 that is eccentrically rotated in the cylinder 4 is attached to the. In the cylinder 4, there is provided a blade 9 which is constantly kept in contact with the rotor 5 by a spring 10, and although not shown, the gas sucked into the cylinder 4 from the suction pipe is Rotor 5 cylinder 4
The volume of the space surrounded by is reduced as the rotor 5 rotates, is compressed, is discharged into the discharge muffler 13 through the discharge port 11 and the discharge valve 12, and then is pierced by the discharge muffler 13. It is discharged from the small hole 14 into the closed container 1. The gas discharged into the closed container 1 passes through the gap between the rotor 2 and the stator 3 of the motor and is discharged from the discharge pipe 15 to the outside of the compressor.

[Problems to be solved by the device]

In the conventional rotary compressor as described above, the length of the eccentric part of the crankshaft is set to be 2 to 3 mm lower than the height of the cylinder. There has been a problem that the upward force causes the rotor 5 to move up and down, causing abnormal noise. Further, due to this vertical movement, the thrust surface of the eccentric portion of the crankshaft may come into contact with the upper bearing 7 and the lower bearing 8 to cause seizure or the like, which may damage the compressor, and to prevent the rotor 5 from moving vertically. Although a downward force is generated by attaching a skew pitch to the rotor 5 or shifting the magnet center, there is a problem that the skew pitch and the displacement of the magnet center significantly reduce the efficiency. The present invention is intended to solve the above-mentioned problems, and an object thereof is to obtain a rotary compressor with low noise, high reliability, and high efficiency.

[Means for solving problems]

In view of this, the present invention comprises a motor part, a compressor part, and a crankshaft that directly connects both parts in a closed container, and the compressor part closes at least a cylinder and the upper and lower ends of the cylinder, In a rotary compressor that has upper and lower bearings that support the shaft, a rotor attached to the eccentric portion of the crankshaft, and a blade that is in constant contact with the rotor, the length of the eccentric portion of the crankshaft is set to the cylinder height. It is intended to provide a rotary compressor characterized in that an oil film for noise reduction is formed between them by 40 μm to 100 μm.

[Action]

Since the length of the eccentric part of the crankshaft is fitted and fitted to be lower than the height of the cylinder by about 40 μm to 100 μm, a sufficient oil film is formed above and below the eccentric part of the crankshaft. Even if vertical movement occurs, no abnormality occurs due to the oil film, and the upper bearing 7 and the lower bearing 8 do not come into direct contact with the crankshaft.

[Example of device]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. In these figures, the same parts as those in the conventional example are designated by the same reference numerals. First, reference numeral 1 in FIG.
A motor unit X formed of a rotor 2 and a stator 3 and a compressor unit Y formed of a cylinder 4 and a rotor 5 are housed in a closed container indicated by. These are an upper bearing 7 and a lower bearing. It is directly connected to a crankshaft 6 which is rotatably supported by 8. The eccentric portion 6A of the crankshaft 6 is fitted with the rotor 5 which eccentrically rotates inside the cylinder 4. Also,
A blade 9 is provided on the cylinder 4 so as to be constantly in contact with the rotor 5 by a spring 10, and a gas sucked into the cylinder 4 from a suction pipe (not shown) is discharged through a discharge hole 11 and a discharge valve. It is ejected into the ejection muffler 13 via 12. Further, the gas that has passed through the discharge muffler 13 is
Then, the gas is sent to the unit side by the discharge pipe 15 through the gap 16 with the stator 3 and the air holes 17 provided in the rotor 2 and the stator 3. At this time, a pressure difference is generated between the upper and lower sides of the rotor 2, but a force that lifts the rotor 2 of the motor and the crankshaft 6 is generated, but as shown in FIGS. Between the eccentric part 6A of 6 and the upper bearing 7 that is in close contact with the cylinder 4
To maintain sufficient oil film above and below the eccentric part of the crankshaft.
18 is formed. The appropriate clearance H is 40 μm
It is about 100 μm. Therefore, the oil film 18 formed in the clearance H
As a result, the vertical movement of the crankshaft 6 is restricted, the eccentric portion 6A does not contact the upper bearing 7 and the lower bearing 8, and no abnormal noise is generated.

[Effect of device]

As is clear from the above description, in the rotary compressor of the present invention, the clearance is narrower than that which was conventionally considered to be better, but the clearance is narrowed so that the length of the eccentric part of the crankshaft is greater than the height of the cylinder. 40 μm-100 μm
Since the gap is made low enough to form an oil film above and below the eccentric portion of the crankshaft, the movement of the crankshaft and the rotor can be suppressed, and the noise can be reduced. The eccentric portion does not come into contact with the upper bearing and the lower bearing, there is no damage such as seizure, the reliability is high, and the occurrence of abnormal noise is great. Further, it is not necessary to provide a rotor skew pitch for pressing an upward force due to a pressure difference between the upper and lower sides of the rotor or a magnet center shift, and thus it is possible to obtain a highly efficient rotary compressor. it can.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary compressor according to the present invention, FIG. 2 is an explanatory view showing a relationship between an eccentric part of the crankshaft and a cylinder height, and FIG. 3 shows oil films above and below the eccentric part of the crankshaft. FIG. 4 is a sectional view of a conventional rotary compressor. 1 ... airtight container, 2 ... motor rotor, 3 ... motor stator, 4 ... cylinder, 5 ... rotor, 6 ... crankshaft, 6A ... crankshaft eccentric part, 7
...... Upper bearing, 8 …… Lower bearing, 9 …… Blade, 11…
… Discharge hole, 13 …… Discharge muffler. The same reference numerals in the drawings indicate the same or corresponding parts.

Front page continued (72) Takashi Yamamoto, Takashi Yamamoto, 3-18-1, Oka, Shizuoka-shi, Shizuoka Mitsubishi Electric Corporation Shizuoka Plant (72) Nao Takimoto, 3-18-1, Oka, Shizuoka-shi, Shizuoka Mitsubishi Electric Corporation Shizuoka Seisakusho Co., Ltd. (56) References Japanese Unexamined Patent Publication No. 56-106089 (JP, A) Actual development No. 60-183289 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. A motor, a compressor section, and a crankshaft for directly connecting both sections to each other in a hermetically sealed container, wherein the compressor section at least closes a cylinder and upper and lower ends of the cylinder, and a crankshaft. Support the upper and lower bearings,
In a rotary compressor having a rotor attached to an eccentric portion of a crankshaft and a blade that is in constant contact with the rotor, the length of the eccentric portion of the crankshaft is set to be 40 μm to 100 μm lower than the height of the cylinder. A rotary compressor characterized in that an oil film for noise reduction is formed between them.