JPH029960A - Compressor - Google Patents

Abstract

PURPOSE:To deform a boss section in response to a shaft, resolve the contact between the shaft and a main bearing, and prevent the damage of them by fitting a ceramic ring with high rigidity on the outside of the boss section on the main bearing of the shaft. CONSTITUTION:The shaft 5 of a compressor 1 is rotated by a motor constituted of a stator 3 shrinkage-fitted in a sealed shell 2 and a rotor 4. A rotor 6 incorporated in the shaft 5 is eccentrically rotated, the compression gas guided into a cylinder 7 through an intake pipe 10 is compressed. A lubricating oil 11 is fed to a main bearing 8 and an auxiliary bearing 9 of the shaft 5 through an oil feed pipe 12. In this case, a ring 13 made of silicon carbide is shrinkage-fitted to the boss section 8a of the main bearing 8. The rigidity of the boss section 8 is improved, the boss section 8a is deformed by the stress received from the shaft 5, the contact between the shaft 5 and the main bearing 8 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a compressor used in refrigerator-freezers, air conditioners, and the like.

2. Description of the Related Art In recent years, compressors for refrigerators and refrigerators and air conditioners are desired to have higher efficiency from the viewpoint of energy conservation. Hereinafter, an example of the position of a conventional compressor will be described with reference to the drawings.

FIG. 3 shows a sectional view of a conventional compressor. In FIG. 3, 1 is a compressor. 2 is a sealed shell, 3 is a sealed shell 2
4 is a rotor that is paired with the stator 3 to form a motor, and 5 is a shaft that is shrink-fitted to the rotor 4. 6 is a roller incorporated in the centroid of the shaft 5, 7 is a cylinder that houses the roller 6, 8 is a main bearing of the shaft 5, 8a is a boss part of the main bearing 8, 9 is a sub-bearing of the shaft 5, 10 is a suction pipe welded to the closed shell 2 which is press-fitted into the sub-bearing 9. Stator 3 and rotor 4
The shaft 5 is rotated by a motor, and the roller 6 is rotated eccentrically, thereby compressing the compressed gas introduced into the cylinder 7 through the suction pipe 10.

Further, the lubricating oil 11 is supplied through the oil supply pipe 12 to the bearing gaps between the shaft 5, the sub bearing 9, the rollers 6, and the main bearing 8.

Problems to be Solved by the InventionHowever, 1. In the above configuration, since the shaft 5 is supported by the main bearing 8 which is cantilevered with respect to the rotor 4,
Due to the unbalance of the rotor 4, the boss portion 8a of the main bearing 8 and the shaft 5 come into metal contact, resulting in a decrease in reliability due to wear and an increase in sliding loss. Fig. 4 is an enlarged view of the shaft 5 and the main bearing 8. shows. As shown in FIG. 4, the shaft 5 is deflected due to the unbalance of the rotor 4, and the shaft 5 slides at an angle with respect to the bearing end of the boss portion 8a of the main bearing 8, resulting in a lack of oil film. The shaft 5 and the boss portion 8a of the main bearing 8 are in contact with each other. In order to reduce this contact surface pressure and prevent contact, conventionally the rigidity of the boss part 8a of the main bearing 8 has been reduced so that the boss part 8a is deformed in accordance with the shaft 5, but the rigidity of the boss part 8a If it drops too much, the amount of whirling of the rotor 4 will increase due to deformation of the bearing, causing a problem that the stator 3 and rotor 4 will come into contact with each other.

Therefore, there has been a desire for a bearing that deforms in accordance with the deflection of the shaft without reducing the rigidity of the entire bearing boss portion.

In view of the above problems, the present invention reduces wear on the shaft and main bearing by deforming the main bearing boss portion to fit the shaft and preventing contact between the shaft and the main bearing, thereby providing a highly reliable and efficient compressor. It's something you get.

Means for Solving the Problems In order to solve the above problems, the compressor of the present invention has a highly rigid ceramic ring attached to the outside of the boss portion of the main bearing.

Operation The present invention improves the rigidity of the boss portion of the main bearing with the above-described configuration, and expands the pressure receiving area by deforming the entire bearing boss portion due to the stress received from the shaft. As a result, the surface pressure on the main bearing boss portion is reduced, and contact between the shaft and the bearing end of the main bearing due to oil cutting can be prevented.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows a sectional view of a compressor according to an embodiment of the present invention. In FIG. 1, 1 is a compressor. 2 is a sealed shell, 3 is a stator shrink-fitted to the sealed shell 2, and 4 is a stator 3.
5 is a shaft shrink-fitted to the rotor 4, 6 is a roller incorporated in the eccentric part of the shaft 5, 7 is a cylinder that houses the roller 6, and 8 is a main bearing of the shaft 5. , 8a is a boss portion of the main bearing 8, 9 is a sub-bearing of the shaft 5, 10 is a suction pipe press-fitted into the sub-bearing 9 and welded to the sealed shell 2, and 13 is a boss portion 8a of the main bearing 8.
It is a silicon carbide ring that is shrink-fitted to the The shaft 5 is rotated by the motor composed of the stator 3 and the rotor 4, and the roller 6 is eccentrically rotated accordingly.
The compressed gas introduced into the cylinder 7 through the suction pipe 10 is compressed, and the lubricating oil 11 passes through the oil supply pipe 12 into the bearing gaps between the shaft 5, the auxiliary bearing 9, the rollers 6, and the main bearing 8. supplied to

In order to confirm the effect of this silicon carbide ring 13, the amount of wear was evaluated using a compressor having the same shape except for the main bearing 8.

Conditions Cylinder volume: 4.5cc Compressed gas: R12 Pressure conditions: High pressure 20 kg/ant G low pressure 1.
By using the ring of this example, the amount of wear on the main bearing 8 and the shaft 5 was reduced as shown in the continuous operation time of 3 boats/CiG = 5000 hours or more.

FIG. 2 shows an enlarged view of the shaft 5 and main bearing 8 in this example. As shown in FIG. 2, the entire boss portion 8a is tilted by the ring 13, which increases the pressure-receiving area, and it is considered that oil film breakage is less likely to occur compared to the conventional example.

Therefore, according to this embodiment, by attaching the silicon carbide ring 13 to the boss portion 8a of the main bearing 8, the amount of wear on the main bearing 8 and the shaft 5 can be reduced.

In this example, the ring 13 has a Young's modulus of 4.4×10
Although it is made of silicon carbide with kgf/cnf, the same effect can be obtained if it is made of ceramic with a high Young's modulus.

Effects of the Invention As described above, the present invention can reduce wear on the main bearing and shaft by attaching a ceramic ring to the outside of the boss portion of the main bearing, thereby improving the reliability of the compressor. can.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a compressor according to an embodiment of the present invention, FIG. 2 is an enlarged view of the main bearing portion of a compressor according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of a conventional compressor. FIG. 4 is an enlarged sectional view of the main bearing portion of a conventional compressor. 3... Stator, 4... Rotor, 5...
...Shaft, 7...Cylinder, 8...
...Main bearing, 13...Ring. 3-Suko-Yu

Claims (1)

[Claims] a stator, a rotor that constitutes a motor in pair with the stator, a shaft attached to the rotor, a cylinder that takes in compressed gas, a main bearing of the shaft installed between the rotor and the cylinder; A compressor equipped with a ceramic ring attached to the outside of the boss of the main bearing.