KR950013013B1 - Compressor slider - Google Patents

Abstract

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Description

Slide Structure of Hermetic Refrigeration Compressor

1 is a cross-sectional view showing a typical refrigeration compressor.

2 is an exploded perspective view showing a fastening structure of a slide in a conventional compressor.

3 is a cross-sectional view showing a state in which a conventional slide is operated in the sliding part of the piston.

4 is a perspective view showing a slide of the present invention.

5 is a plan sectional view showing a state in which the slide of the present invention is operated in the sliding part of the piston.

6 (a), (b) and (c) are cross-sectional views showing other embodiments of the present invention.

* Explanation of symbols for main parts of the drawings

4: piston 4a: sliding part

6: cylinder 10: slide

11 shaft hole 20 mass

The present invention relates to a slide of a hermetic refrigerating compressor, and more particularly, to a slide structure of a hermetic refrigerating compressor which reduces wear in the sliding parts of the slide and the piston and reduces lateral pressure applied to the piston.

Generally, as shown in FIGS. 1 to 3, a refrigeration compressor has a transmission unit 3 for generating rotational force under the frame 2 in the compression container 1, and is provided on the upper part of the frame 2. A piston 4 is mounted to install a compression device for sucking or compressing a refrigerant. A crankshaft 5 for driving a compression device is mounted at the center of the transmission part 3 so that the upper end of the crankshaft 5 is piston 4. It is operably connected to the sliding part 4a of (), and the oil hole 5a is formed in the center of the crankshaft 5.

Here, the compression device is a cylinder (6) is supported on the upper frame 2, the piston (4) is mounted inside the cylinder (6), the cylindrical sliding portion on one side of the piston 4, the lower sliding part ( 4a) is integrally formed, and the slide 7 is slidably inserted inside the sliding part 4a. In addition, the slide 7 has a shaft hole and an oil filling hole formed at the center thereof, and a crank pin 5b formed at the top of the crank shaft 5 through the lower portion of the inclined piston 4 sliding part 4a rotates in the shaft hole. It is inserted as possible.

In the conventional refrigeration compressor configured as described above, when the power is applied, the electric motor 3 rotates to generate a driving force, and the crankshaft 5 inserted into the electric motor part 3 is integrally rotated. At this time, the slide (7) inserted into the crank pin (5b) of the crankshaft (5) is moved along the rotational trajectory of the crank pin (5b), the outer peripheral surface of the slide (7) sliding part (4a) of the piston (4) It will reciprocate within. Therefore, the piston 4 reciprocates in the cylinder 6 by the slide 7a of the slide 7 and the piston 4, and the refrigerant is sucked or compressed. On the other hand, while the piston 4 and the slide 7 are operated in this way, the sliding part 4a and the slide 7 of the piston 4 through the oil hole 5a and the oil filling hole formed in the center of the crankshaft 5 are operated. ) Is supplied with lubricating oil.

As shown in FIG. 3, the conventional refrigeration compressor operated as described above attempts to rotate the slide 7 by the rotating crank pin 5b, and the slide 7 slides the sliding portion 4a of the piston 4. Since it operates in the same direction as the arrow in a state limited to the inner circumferential surface, a side pressure is generated in which the upper left edge thereof comes into close contact with the inner circumferential surface of the sliding part 4a. In addition, the piston 4 into which the slide 7 is inserted also acts to force the sliding portion 4a to rotate in the same direction as the arrow, so that side pressure is generated on the upper right side and the lower left side. As a result, uneven wear occurs in the side pressure portion, the refrigerant leaks, and the refrigeration efficiency is reduced.

In order to solve the above problems, the object of the present invention is to offset the inertia force of the slide to move along the rotational trajectory of the crank pin so that the center of gravity of the slide is biased in the direction of the rotational axis of the crankshaft to reduce wear of the inner peripheral surface of the sliding part. To provide a slide structure of the hermetic refrigeration compressor.

Hereinafter, the technical configuration of the present invention according to the accompanying drawings in detail as follows.

4 is a perspective view showing a slide of the present invention, Figure 5 is a plan sectional view showing the operating state of the slide of the present invention, the present invention is a predetermined weight on the slide 10 in the direction of the central axis of the crank shaft 5 is rotated The mass body 20 which has a is provided. That is, the technical configuration is characterized in that the center of gravity is formed on the left side from the center of the shaft hole 11 into which the crank pin 5b is inserted as shown in the figure.

According to the present invention configured as described above, when the crankshaft 5 rotates, the crank pin 5b installed at a position eccentric from the rotational axis of the crankshaft 5 rotates along a constant rotational trajectory, and thus the slide 10 also moves. While having a rotational inertia force in the same direction as the rotational direction of the crank pin (5b) is to reciprocate in the longitudinal direction inside the sliding portion (4a) of the piston (4).

At this time, since the center of gravity of the slide 10 is biased by the mass 20 in the rotational direction of the crankshaft 5 (the slide itself becomes the left side in the drawing), that is, the left side of the slide 10 Since the center of gravity of the slide 10 is formed on the left side at the center of rotation of the shaft hole 11 into which the crank 5b is inserted by the weight of the installed mass 20, the force acting on the left and right ends of the slide 10. This decreases, thereby reducing the side pressure acting on the inner circumferential surface of the sliding part 4a of the piston 4 and the inner circumferential surface of the cylinder 6.

In other words, conventionally, since the center of the shaft hole 11 is the center of gravity of the slide, the slide along the rotational trajectory of the crankpin also retains the rotational inertia force in the same direction as the rotational trajectory of the crankpin, and thus the wetness of the piston 4 Sliding the eastern part 4a from side to side, the inertia force direction of the slide, i.e., the upper left and lower right edges contacted the inner circumferential surface of the sliding part 4a, resulting in friction, which caused side pressure.

Accordingly, the present invention is to reduce the lateral pressure generated by sliding the slide in the deflected state of the prior art by centering the center of gravity of the slide 10 in the axial direction about the rotation axis of the crankshaft 5 By placing the mass 20 on the left side of the slide 10 so that the high center of gravity is biased, the rotational inertia generated by the rotational trajectory of the crank pin 5b is canceled out so that the slide 10 is wetted by the piston 4. Since the sliding portion parallel to the longitudinal direction of the eastern portion 4a, the side pressure is reduced at the upper left and lower right edges of the slide 10, thereby preventing uneven wear of the slide 10 end. '

On the other hand, Figure 6 is a cross-sectional view of a slide showing other embodiments of the present invention, (a) is formed in the shaft hole 11 of the slide 10 in the guess, (b) is grooves in the slide 10 guess surface The center of gravity is moved to the left side of the shaft hole 11, and (c) shows that the mass body 20 formed on the left side of the slide 10 is integrally formed.

The present invention reduces the lateral pressure generated between the slide 10 and the inner peripheral surface of the sliding portion 4a of the piston 4 by the unbalanced center of gravity, and reduces the side pressure acting on the sliding portion 4a. Lateral pressure generated on the inner surface of the cylinder 6, which is operated reciprocally, is also reduced, so that friction at the contact portion can be reduced, and efficiency can be minimized after long-term operation, and the sliding portion 4a of the piston 4 can be minimized. ) Improves reliability and reduces high frequency noise by reducing wear of inner circumferential surface and slide 10 outer circumferential surface.

As described above, the present invention converts the rotational movement of the crankshaft into a reciprocating motion to form a mass on the left side of the slide for operating the piston, so that the center of gravity is formed on the left side from the rotational center of the shaft hole, the side pressure of the contact It is very useful to reduce uneven wear and noise.

Claims (4)

In the hermetic refrigeration compressor having a slide for reciprocating the sliding part of the piston along the rotational track of the crank pin provided on the top of the crank shaft, the center of gravity of the slide is biased toward the center of the rotation axis of the crank shaft centered on the shaft hole Slide structure of the hermetic refrigeration compressor characterized in that. 2. The slide structure of a hermetic refrigeration compressor according to claim 1, wherein a mass of a predetermined weight is installed at the slide end in the center direction of the rotation axis of the crankshaft. The slide structure of a sealed refrigeration compressor according to claim 1, wherein a groove is formed at the slide end in a direction opposite to the center of the rotation axis of the crankshaft. 2. The slide structure of a hermetic refrigeration compressor according to claim 1, wherein the shaft hole is biased from the center of gravity of the slide in a direction opposite to the center of the crank shaft.