JP2635395B2 - Rotary compressor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor for a refrigeration cycle used in a household refrigerator or the like.

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

Hereinafter, an example of a conventional rotary compressor will be described with reference to the drawings. FIG. 6 shows a published patent publication 62-2194.
No. 91 is a sectional view of a rotary compressor, and FIGS. 7 and 8 are sectional views of a motor rotor of a conventional rotary compressor. Reference numeral 1 denotes a closed container, and 2 denotes a motor having a stator, a coil 2a, and a rotor having a fully-closed groove.
And a compression device 15 driven by the motor 4. Reference numeral 5 denotes a countershaft formed at one end of a shaft.
6a, a main shaft portion 6b formed on the other end side, and an eccentric portion 7 formed between the two portions.
Is fixed. Reference numeral 8 denotes a cylinder forming 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 which are airtightly closed on 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. 21 is a discharge valve provided on the sub side housing 11, 22 is a discharge muffler having a sub opening 23,
It is mounted on the sub side housing 11. Reference numeral 24 denotes a discharge pipe, one end of which is open to the closed container space 16, and the other end of which is connected to the high pressure side of a system (not shown).

In the above configuration, the rotation of the rotor is transmitted to the shaft 5, and the roller 12 fitted in the eccentric portion 7 rolls in the compression chamber 9, and is compressed by the vane 13 pressed against the roller 12.
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, is released into the closed container space 16 through the opening 23, and is discharged from the discharge pipe 24.

As another example, there is a compressor provided with a rotor having a semi-closed groove as shown in FIG.

The slot 3a of the conventional rotor 3 is a fully closed groove type having a sealing portion 3c shown in FIG. 2 or an opening portion shown in FIG.
It was either of the semi-closed groove type with 3b.

However, in the above-described configuration, an extremely large load change occurs in the motor 4 during one rotation due to a change in the pressure in the compression chamber 9. For this reason, when the motor 4 is a fully closed groove rotor, electromagnetic noise having a frequency around 500 Hz abnormally increases due to the influence of electromagnetic vibration. For a semi-closed groove rotor
The sound around 1.5KHz increases. Due to the above-described configuration, there is a problem that the electromagnetic noise is directly transmitted to the closed container and radiated to the outside. Fig. 5 shows 100W output
1 shows noise characteristics of the conventional rotary compressor of 0 to 2 KHz.
In a compressor equipped with a fully closed groove rotor, the noise due to the effects of electromagnetic vibration is increasing around 500 Hz. Further, a compressor having a half-closed grooved rotor can reduce noise around 500 Hz, but increases noise around 1.5 KHz.

In view of the above problems, the present invention has low electromagnetic noise even when a large load change occurs in a motor due to a change in pressure of a compression chamber or the like.
Another object of the present invention is to provide a rotary compressor that does not generate noise near 1.5 KHz.

Means for Solving the Problems In order to solve the above problems, the rotary compressor of the present invention is configured such that the stator is directly fixed to the inner peripheral surface of the closed vessel, and the rotor is only a part of each slot. Has a semi-closed groove shape and the rest of the slots have a fully closed groove shape.

The present invention can solve the problem of the noise of the compressor having the rotor of the fully closed groove and the problem of the noise of the compressor having the rotor of the partially closed groove by the above configuration.

Examples Hereinafter, a rotary compressor according to an embodiment of the present invention will be described.
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 components and operations will be omitted.

1 to 3, reference numeral 3 denotes a rotor, which has a columnar Al shape.
There is a slot 3a filled with material, and the slot 3a
Is a semi-closed groove with an opening 3b, and the rest of the slot 3a is a fully closed groove with a sealing portion 3c.

In the configuration as described above, the compression mechanism compresses the refrigerant gas by the rotational motion of the rotor 3, and the spatial harmonics from the stator 2 flow in the rotor 3 (not shown), and the opening of the rotor 3 Since the magnetic resistance of 3b is large, the harmonic magnetic flux flows in a form linking with the conductor accommodated in the slot 3a, current flows in the direction to cancel the harmonic magnetic flux in the conductor, spatial harmonics decrease, and electromagnetic vibration is low. Become.

Next, the noise characteristics of the rotary compressor having the above configuration will be described.

FIG. 5 shows the noise characteristics at 0 to 2 KHz of the rotary compressor having the configuration of the present invention in a rotary compressor having an output of 100 W.

As a result, in a conventional rotary compressor having a fully closed groove rotor, an extremely large load fluctuation occurs in the motor 4 due to a change in pressure in the compression chamber, and the electromagnetic fluctuation around 500 Hz, which is abnormally increased due to the influence of the electromagnetic vibration. The noise with the configuration of the present invention was low, and the noise level near 1.5 KHz, which was high with the rotary compressor having the semi-closed groove rotor, could be reduced.

Effects of the Invention As is clear from the above embodiments, the present invention is such that the stator is directly fixed to the inner peripheral surface of the sealed container, and the rotor has a semi-closed groove shape having only a part of each slot with an opening, The remainder of the slot is equipped with a motor that has a fully closed groove shape with a closed part, so that the amount of electromagnetic noise generated by electromagnetic vibration can be reduced, and the noise around 1.5 KHz is low. Machine can be realized.

[Brief description of the drawings]

1 is a longitudinal sectional view of a motor rotor of a rotary compressor according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG. FIG. 4 is a sectional view of a rotary compressor provided with the motor rotor of FIG.
The figure is a noise characteristic diagram of 0 to 2 KHz in the present invention and the conventional rotor specification, FIG. 6 is a sectional view of a conventional rotary compressor, and FIG.
FIG. 6 is a sectional view of a fully closed groove rotor of the rotary compressor shown in FIG. 6, and FIG. 8 is a sectional view of a half closed groove rotor similarly. 1 ... closed container, 2 ... stator, 3 ... rotor, 3a ...
Slot, 3b: Opening of semi-closed groove, 3c: Sealed part of fully closed groove, 5: Shaft, 8: Cylinder, 9: Compression chamber,
10 ... Main side housing, 11 ... Sub side housing, 12 ... Roller.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Haruhiko Iwai 3--22, Takaidahondori, Higashiosaka-shi, Osaka Inside Matsushita Refrigerating Machinery Co., Ltd. Matsushita Refrigeration Co., Ltd.

Claims (1)

(57) [Claims] 1. A motor having a rotor and a stator, a shaft having an eccentric portion, a cylinder forming a compression chamber concentrically with a rotation center of the shaft, and both side surfaces of the cylinder in an airtight container. A side housing that is closed in a closed manner, a roller mounted on the eccentric portion, and rolling along the inner wall of the cylinder by rotation of the shaft, and a high-pressure chamber and a low-pressure chamber in contact with an outer peripheral portion of the roller. The stator is directly fixed to the inner peripheral surface of the closed vessel, and the rotor is formed in a semi-closed groove shape having an opening in only a part of each slot, and the remainder of the slot is sealed. And a motor having a fully closed groove shape.