JPH0425439B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary compressor used in freezing and refrigeration equipment and the like.

Conventional Structure and Problems Conventionally, in rotary compressors, a method has been adopted in which a balance weight is added to the motor rotor in order to eliminate rotational imbalance caused by eccentricity of the crankshaft.

A conventional example will be described below with reference to FIG.

1 is a rotary compressor, 2 is a closed case, 3 is a stator, and 4 is a rotor. The rotor 4 is connected to a crankshaft 5, and a roller 7 is slidably fitted around the outer periphery of the crankshaft eccentric portion 6. 8 is a cylinder, and 9 is an upper bearing, which are fixed to the sealed case 2 by welding. 10 is a lower bearing, and 11 is an oil supply pipe. Reference numeral 12 denotes a lower balance weight, which is connected to the rotating shaft 14 of the shaft 5 having an eccentric portion 6.
In contrast, the load in the anti-eccentric direction is increased,
Reference numeral 13 denotes an upper balance weight, which is placed on the opposite side from the lower balance weight 12.

With this configuration, the upper balance weight 12
By appropriately determining the load on the lower balance weight 13, it is theoretically possible to perfectly balance the dynamic load against the eccentric load generated by the eccentric portion 6 and roller 7. However, in reality, there are variations in eccentric loads, upper and lower balance weights 12,
Due to the installation error of No. 13, it is difficult to achieve a perfect dynamic balance, and vibration problems may occur due to unbalance.

OBJECTS OF THE INVENTION The present invention aims to reduce unbalanced vibrations during rotation as much as possible, and is also effective in small-sized rotary compressors in which vibration components caused by uneven rotation due to load fluctuations are small.

Structure of the Invention The present invention includes a fluid balancer that balances rotation by using lubricating oil from an oil supply section that supplies lubricating oil to a portion where the lubricating oil is needed.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIG. In order to avoid duplication of explanation, the same parts as in the conventional example are given the same reference numerals and the explanation will be omitted.

15 is a container member that serves as an oil supply pipe and oil reservoir;
It consists of a substantially cylindrical oil sump 16, a fitting part 17 with the crankshaft 5 that protrudes integrally from the bottom 16a forming the bottom of the oil sump 16, and an oil supply pipe 18 provided at the tip thereof. The protruding portion 10 of the lower bearing 10 is located on the upper surface portion 16b of the reservoir portion 16.
A hole 16c larger than the outer diameter of a is provided.

Reference numeral 16d denotes an oil sump side surface that connects the top surface 16b and the bottom surface 16a. Reference numeral 19 denotes an oil supply pipe that sends oil sucked up from the oil supply pipe section 18 to each sliding surface, and a branch pipe 20
This oil is supplied to the lower bearings 9, 10, roller 7, etc.

In this configuration, when the crankshaft 5 rotates, oil is sent from the oil supply pipe section 18 to each sliding surface, and the reserve oil is transferred to the lower bearing 10 and the crankshaft 5.
The oil drips into the oil sump 16 through the gap between them, and gradually accumulates in a predetermined amount. At this time, since the oil sump 16 is rotating in conjunction with the crankshaft 5, the oil accumulated in the oil sump 16 is pushed toward the outer circumference by centrifugal force and rotates along the inner surface of the side surface 16d. . In this case, if there is no unbalance in rotation, the oil will be evenly distributed over the inner circumferential surface of the oil sump 16, but if unbalance occurs, the uneven weight A The amount of oil in the opposite direction is larger, which acts as a fluid balancer to reduce unbalance, thereby reducing unbalance vibration. Here, O is the main axis of rotation, G
is the center of gravity, and S is the center of rotation. Incidentally, when the oil in the oil sump 16 reaches a predetermined amount or more, the oil flows out from the hole 16c.

Effects of the Invention As described above, the present invention constitutes a fluid balancer using lubricating oil sent from an oil supply section such as an oil supply pipe, and can reduce unbalanced vibrations that could not be completely eliminated with conventional fixed balancers. In addition, since the lubricating oil and its oil supply part are used, it is possible to obtain a rotary compressor that can be easily constructed and has less vibration.

[Brief explanation of drawings]

Figure 1 is a sectional view of a rotary compressor showing a conventional example.
FIG. 2 is a sectional view of a rotary compressor showing an embodiment of the present invention, and FIG. 3 is a schematic diagram showing the behavior of oil in an oil sump. 5... Crankshaft, 15... Container member,
16a...bottom part, 16d...side view, 16b...
...Top view, 16c...hole.

Claims (1)

[Claims] 1 a compression section, a motor that drives this compression section,
A rotary compressor that includes an oil supply section that sends lubricating oil to the compression section, and a fluid balancer that receives and stores the lubricant oil from the oil supply section and balances the rotation.