JPH088311Y2 - Rotary compressor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rotary compressor for a refrigeration cycle used in a home refrigerator or the like.

2. Description of the Related Art In recent years, the popularity of rotary compressors in the refrigeration and air conditioning industry has been extremely remarkable.

An example of a conventional rotary compressor will be described below with reference to the drawings. FIG. 3 shows the published patent publication 62-21949.
It is a sectional view of the rotary compressor seen in No. 1. Reference numeral 1 denotes a closed container, and the closed container 1 accommodates an induction motor 4 including a stator 2, a coil 2a, and a rotor 3, and a compression device 15 driven by the induction motor 4. Reference numeral 5 denotes a shaft, which is composed of a sub shaft portion 6a formed at one end portion, a main shaft portion 6b formed at the other end portion, and an eccentric portion 7 formed between both portions. The main shaft portion 6b has a rotor. 3 is fixed by shrinkage fitting. Reference numeral 8 denotes a cylinder that forms a compression chamber 9 concentrically with the rotation center of the shaft 5, and reference numerals 10 and 11 denote a main side housing and a sub side housing that hermetically close both side surfaces of the cylinder 8. A roller 12 is mounted on the eccentric part 7 and rolls along the inner wall of the compression chamber 9. A vane 13 contacts the roller 12 and partitions the compression chamber 9 into a high-pressure chamber and a low-pressure chamber. Reference numeral 20 denotes a suction pipe, one end of which is press-fitted into the sub-side housing 11 and which opens to the low-pressure chamber of the compression chamber 9, and the other end of which is connected to the low-pressure side of the system (not shown) outside the closed casing 1. twenty one
Is a discharge valve provided in the sub-side housing 11, 22 is a discharge muffler having a sub-opening 23, and is attached to the sub-side housing 11. 24 is a discharge pipe, one end is a space inside a closed container
It is open at 16 and the other end is connected to the high pressure side of the system (not shown).

In the above structure, the rotation of the rotor is transmitted to the shaft 5, the roller 12 fitted to the eccentric portion 7 rolls in the compression chamber 9, and the vane 13 pressed against the roller 12 causes the compression chamber 9 to move.
Since the inside is partitioned into a high-pressure chamber and a low-pressure chamber, the gas sucked from the suction pipe 20 is continuously compressed. The compressed gas is discharged from the discharge valve 21 into the discharge muffler 22 and is then released into the space 16 inside the closed container through the opening 23 and discharged from the discharge pipe 24.

However, in the above configuration, in order to maintain the characteristics of the induction motor 4, the distance between the conductor of the rotor 3 and the outer peripheral surface is set to the minimum dimension capable of ensuring mechanical strength. There is a problem that the position of the conductor with respect to the outer peripheral surface shifts when the child 3 is manufactured, and the deviation ratio of the distance between the outer peripheral surface and the conductor increases, so that electromagnetic noise at a frequency near 500 Hz increases due to the influence of electromagnetic vibration. It was

In view of the above problems, the present invention provides a rotary compressor with low electromagnetic noise even when a large load change occurs in the motor due to a pressure change in the compression chamber.

In order to solve the above problems, in the rotary compressor of the present invention, the stator is directly fixed to the inner peripheral surface of the hermetic container, and the rotor is composed of a conductor and an outer peripheral surface. It is equipped with an induction conductor whose distance is more than 1.0 times the air gap.

The present invention can suppress the increase in electromagnetic noise due to electromagnetic vibration by suppressing the deviation ratio of the distance between the conductor and the outer peripheral surface over the entire circumference at the time of manufacturing the rotor with the above structure.

Embodiments Regarding the rotary compressor of one embodiment of the present invention,
This will be described with reference to the drawings. The same parts as those in the conventional example will be described using the same reference numerals, and the same parts in the configuration and operation will be omitted.

In FIGS. 1 and 2, reference numeral 23 denotes a rotor, and a rotor conductor 23 a is embedded in a rotor iron core 23 c inside an outer peripheral surface 23 b of the rotor 23. An air gap 25 is a gap between the inner peripheral surface 2b of the stator 2 and the outer peripheral surface 23b of the rotor 23. The distance between the conductor 23a and the outer peripheral surface 23b is larger than the dimension of the air gap 25.

When the rotor 23 is manufactured in the above-described configuration, the outer peripheral surface
Even if the conductor 23a is displaced with respect to 23b, the outer peripheral surface 23b
The degree of influence on the distance between the conductor 23a and the conductor 23a is reduced, and an increase in electromagnetic noise at a frequency near 500 Hz due to the influence of electromagnetic vibration can be suppressed.

Advantages of the Invention As is apparent from the above-described embodiment, the present invention has a stator directly fixed to the inner peripheral surface of a hermetically sealed container, and the rotor has a conductor-outer surface distance of 1.0 times the air gap or more. By providing the electric motor, it is possible to reduce an increase in electromagnetic noise due to electromagnetic vibration, to achieve stable reduction of electromagnetic noise, and to realize a rotary compressor with extremely low noise.

[Brief description of drawings]

1 is a sectional view of a motor rotor of a rotary compressor according to an embodiment of the present invention, FIG. 2 is a sectional view of a rotary compressor equipped with the motor rotor of FIG. 1, and FIG. 3 is a conventional rotary. It is a sectional view of a compressor. 1 ... Airtight container, 2 ... Stator, 2b ... Stator inner surface,
5 ... Shaft, 8 ... Cylinder, 9 ... Compression chamber, 10 ...
… Main side housing, 11 …… Sub side housing, 12
...... Roller, 23 …… Rotor, 23a …… Rotor conductor, 23b…
… Rotator outer surface, 25 …… Air gap.

Claims (1)

[Scope of utility model registration request] 1. An induction motor comprising a rotor and a stator, a shaft having an eccentric portion, a cylinder forming a compression chamber concentric with the rotation center of the shaft, and both side surfaces of the cylinder in a hermetic container. An airtightly closed side housing, a roller mounted on the eccentric portion and rolling along the inner wall of the cylinder due to rotation of the shaft, and a compression chamber and a low pressure chamber that contact the outer peripheral portion of the roller. A vane for partitioning the chamber is housed, the stator is directly fixed to the inner peripheral surface of the closed container, and the rotor is a conductor and the distance between the outer peripheral surface is 1.0 times the air gap or more. Characteristic rotary compressor.