JPH04350393A - Closed type rotary motor-driven compressor - Google Patents

Abstract

PURPOSE:To provide a closed type rotary motor-driven compressor of a low noise level at the operating time. CONSTITUTION:The boss part 26 of a side housing 24 is extended to the inside of a rotor 23, and an oil hole 27 is opened in the boss part 26 for holding a crankshaft 25. The crankshaft 25 is provided with an oil sump 23 in the position of the oil hole 27.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic rotary electric compressor used in refrigeration equipment such as refrigerator-freezers.

0002

BACKGROUND OF THE INVENTION In recent years, hermetic rotary electric compressors have become extremely popular in refrigeration equipment such as refrigerator-freezers, and there is a demand for quieter compressors due to recent housing conditions.

An example of a conventional hermetic rotary electric compressor will be described below with reference to the drawings.

FIG. 4 shows a sealed rotary electric compressor as seen in Japanese Patent Application Laid-open No. 2-267386, in which 1 is a sealed case, 2 is a sealed rotary electric compressor;
3 is a stator, 3 is a rotor, and 4 is a crankshaft which is press-fitted and fixed to the rotor 3 so as to be driven. A roller 6 is rotatably arranged on the circumference of the eccentric portion 5 of the crankshaft 4.

[0005] Reference numeral 7 is a cylinder, and 8 is a vane, which is in contact with the outer peripheral portion of the roller 6. Reference numeral 9 denotes a side housing on the rotor 3 side, which is welded and fixed to the sealed case 1, and seals the end face of the cylinder 7 on the rotor 3 side in a hermetically sealed manner, and pivotally supports the crankshaft 4. A side housing 10 on the opposite side of the rotor 3 hermetically closes the end face of the cylinder 7 on the opposite side of the rotor 3, pivotally supports the crankshaft 4, and has a refrigerant suction and discharge mechanism 11. Reference numeral 12 denotes an oil supply mechanism fitted into one end of the side housing.

A suction pipe 13 passes through the sealed case 1 and is press-fitted into the refrigerant suction and discharge mechanism 11.

When the crankshaft 4 is driven and rotated by the rotor 3 in the above-described configuration, the roller 6 disposed on the circumference of the eccentric portion 5 rolls along the inner wall of the cylinder 7. Compression is made possible by vanes 8 in contact with the outer periphery of the cylinder 7 partitioning the compression chamber formed in the cylinder 7 into a high-pressure side and a low-pressure side.

[0008]

However, in the above-mentioned conventional configuration, since the rotor 3 is provided, the side housing 9
It is not possible to increase the overall length of the boss part of the compressor, the rigidity of the bearing system between the side housing 9 and the crankshaft 4 is weak, and the problem is that the noise level is high when operating the sealed rotary electric compressor. Ta.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a hermetic rotary electric compressor with a low noise level.

0010

[Means for Solving the Problems] In order to achieve the above object, the hermetic rotary electric compressor of the present invention has a boss portion extending to the inner surface of the rotor formed in the side housing, and the crankshaft is disposed within the boss portion. is rotatably held, and the rotor and crankshaft are engaged with each other on the side remote from the side housing.

[0011] Also, an oil hole is provided in the boss portion of the side housing at the portion located on the rotor.

Furthermore, the crankshaft is loosely fitted to the rotor and driven. Further, a stopper is provided at the tip of the crankshaft in order to determine the axial position of the crankshaft of the rotor.

[0013]

[Operation] This configuration makes it possible to extend the overall length of the boss portion of the side housing, making it possible to increase the rigidity of the bearing system between the side housing and the crankshaft, thereby reducing the noise level during operation. becomes possible.

Furthermore, the boss portion of the side housing and the crankshaft can be reliably lubricated through the oil hole.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Note that parts that are the same as those in the conventional example will be described using the same reference numerals, and detailed description thereof will be omitted.

In FIGS. 1 to 3, reference numeral 21 denotes a closed case, into which a stator 22 is press-fitted and fixed. A rotor 23 is arranged to rotate on the inner surface of the stator 22.

24 is a side housing on the rotor 3 side;
It is welded and fixed to the sealed case 21, the end face of the cylinder 7 on the rotor 23 side is hermetically closed, and the crankshaft 25 is pivotally supported. This side housing 24 is the rotor 23
The rotor 3 is provided with a boss portion 26 that extends to the inner surface of the rotor 3, and is formed in a non-contact state with the rotor 3.

The crankshaft 25 is rotatably held by the boss portion 26. Further, an oil hole 27 is formed in a portion of the boss portion 26 located inside the rotor 23, and an oil reservoir 28 is formed in a portion of the crankshaft 25 facing the oil hole 27.

The engagement between the crankshaft 25 and the rotor 23 is performed on the side opposite to the side housing 24.
Notch 29 formed on the side surface of rotor 23 and crankshaft 2
Insert the key 31 between the rotor 2 and the flat part 30 of the rotor 2.
3 is transmitted to the crankshaft 25 via the key 31. Then, the opposite side housing 2 of the key 31
A stopper 32 is attached to the crankshaft 25 with a bolt 33 on the 4 side.

In the hermetic rotary electric compressor constructed as described above, since the entire length of the boss portion 26 of the side housing 24 is extended, the rigidity of the bearing system between the side housing 24 and the crankshaft 25 is increased. Become stronger. Therefore, it is possible to provide a hermetic rotary electric compressor with a low noise level during operation. Further, by providing an oil hole 27 in the boss portion 26 and an oil reservoir 28 in the crankshaft 25, lubrication can be ensured.

[0021]

Effects of the Invention As is clear from the above embodiments, in the sealed rotary electric compressor of the present invention, the entire length of the boss portion of the side housing is extended to the inside of the rotor, so that the connection between the side housing and the crankshaft is improved. The rigidity of the bearing system becomes stronger. Therefore, it is possible to provide a sealed rotary electric compressor with low noise level during operation.

[Brief explanation of the drawing]

[Fig. 1] A cross-sectional view of a hermetic rotary electric compressor according to an embodiment of the present invention.

[Figure 2] A-A sectional view in Figure 1

[Figure 3] BB sectional view in Figure 1

[Figure 4] Conventional hermetic rotary electric compressor

[Explanation of symbols]

21 Sealed case 22 Stator 23 Rotor 24 Side housing 25 Crankshaft 26 Boss part 27 Oil hole 28 Oil pool

Claims (4)

[Claims] 1. A stator press-fitted into a sealed case, a rotor driven by the stator, a crankshaft driven by the rotor, and a side fixed in the sealed case and pivotally supporting the crankshaft. a housing, a boss portion extending to the inner surface of the rotor is formed in the side housing, the crankshaft is rotatably held within the boss portion, and the rotor and crankshaft are connected to the side housing. A sealed rotary electric compressor characterized by engaging on the side away from the . [Claim 2] Claim 1, characterized in that an oil hole is formed in a portion of the boss portion of the side housing that is located on the rotor.
The enclosed rotary electric compressor described. 3. The hermetic rotary electric compressor according to claim 1, wherein a rotor and a crankshaft driven by the rotor are loosely fitted. 4. The hermetic rotary electric compressor according to claim 3, further comprising a stopper provided at the tip of the crankshaft for determining the axial position of the rotor.