JPS63100293A - Swivel scroll supporting mechanism for scroll compressor - Google Patents

Abstract

PURPOSE:To prevent occurrence of a gap on the outer circumference of a bearing, by supporting a swivel scroll on a crankshaft through the bearing and applying a filler composed of such material as having thermal expansion coefficient higher than that of the swivel scroll between the bearing and the swivel scroll. CONSTITUTION:A bearing 6 is fitted in a boss hole 4 of a swivel scroll 7 made of aluminum alloy and a crankshaft 5 is coupled through said bearing 6. A filler 1 composed of synthetic resin having high thermal expansion coefficient, e.g. nylon, polyester, polyacetal, etc., is fitted between the bearing 6 and the inner circumferential face of the boss hole 4. When the temperature of the swivel scroll 7 rises during operation of a scroll compressor, the filler 1, the bearing 6 and the scroll 7 expand thermally, but since the thermal expansion coefficient of the filler 1 is higher than those of others, a gap does not occur on the outer circumference of the bearing 6. Consequently, creeping phenomenon occurs to prevent degradation of durability.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an orbiting scroll support structure for a scroll compressor suitable for smoothly orbiting the orbiting scroll during operation.

BACKGROUND OF THE INVENTION As shown in FIG. 3, an orbiting scroll 7 is pivotally mounted to a crankshaft 5 eccentrically provided to a rotating shaft 9 via a bearing 6. The orbiting scroll 7 has a boss hole 4 into which a bearing 6 is fitted.
and a wrap 7A standing on the opposite side.

Wrap 7A engages with wrap 8A of fixed scroll 8;
The medium introduced from the suction port 11 is compressed and discharged from the discharge port 12. Further, the fixed scroll 8 is fixed to the casing 1°.

Problems to be Solved by the Invention As described above, the orbiting scroll 7 is pivotally supported by the crankshaft 5 via the bearing 6, and is rotated by the same rotation of the crankshaft 5. In this case, the load on the bearing 6 changes its direction with the rotation of the crankshaft 5, and corresponds to the commonly referred to outer ring rotating load, so the outer ring of the bearing 6 and the boss hole 4 need to be tightly fitted. be. On the other hand, since the orbiting scroll 7 is different from the fixed scroll 8 and rotates as described above, it is required to be formed as light as possible. Therefore, it is often formed from a light alloy such as aluminum.

However, since the bearing 6 is often made of steel, a gap is created between the inner circumferential surface of the boss hole 4 and the outer circumference of the outer ring of the bearing 6 at high temperatures such as during machine operation. When a gap occurs, so-called creep occurs, causing a low F speed.
A problem arises in that the smooth operation of the orbiting scroll 7 is impaired during rotation. For this reason, a child actuator is used to connect the bearing 6 and the orbiting scroll 7 by caulking, but this is often unstable and has the problem of not being able to completely prevent creep.

The present invention solves the above-mentioned problems, and provides an orbiting scroll support for a scroll compressor that enables an orbiting scroll to be supported on a bearing without any gaps, enables smooth orbiting movement, and reliably prevents creep damage. It's about providing structure.

Means for Solving the Problems For this purpose, the present invention provides a structure between a bearing for pivotally supporting the orbiting scroll to an eccentrically rotating crankshaft and the orbiting scroll, which has a thermal expansion coefficient higher than that of the orbiting scroll. Scroll pressure created by inserting an inclusion made of material! It constitutes one orbiting scroll support structure.

Effect As mentioned above, even if a force is generated that presses the orbiting scroll toward the bearing side during rotation of the machine due to the presence of ungenerated inclusions, the generation of the gap is prevented. The orbiting scroll will move smoothly.

Example An embodiment of the present invention will be described below based on the drawings.

As shown in FIG. 1, a thin ring-shaped inclusion l is fitted into the boss hole 4 of the orbiting scroll 7.

The orbiting scroll 7 is formed from an aluminum alloy, and the inclusions 1 are heated more than the aluminum alloy by heat [1M! Made from synthetic resins with high l coefficients, such as engineering plastics such as nylon, polyester, polyacetal,
ABS resin etc. are used. A bearing 6 is fitted into the inner peripheral side of the inclusion 1, and a crankshaft 5 is fitted into the bearing 6. That is, the inclusion 1 is sandwiched between the outer periphery of the bearing 6 and the inner periphery of the boss hole 4, and is inserted without any gap.

When the orbiting scroll reaches a high temperature during operation of the scroll compressor, the inclusion 1, the bearing 6, and the orbiting scroll 7 are each stretched. As mentioned above, since the coefficient of thermal expansion of the inclusion l is higher than that of the others, it tends to undergo the most thermal change, but the outer periphery of the inclusion l is restrained from thermal displacement by the boss hole 4, and the inner periphery of the inclusion l The side changes heat while in contact with the outer periphery of the bearing 6. Due to the restriction by the boss hole 4, the inclusion 1 is reversely pressed toward the bearing 6.

Therefore, the above-mentioned gap does not occur between them.

As a result, the orbiting scroll is pivotally supported on the crankshaft 5 without any gaps, and the orbiting scroll is rotated in a circle. ! ? In addition to being moved ☆ times, attacks such as creep are completely prevented.

The embodiment shown in FIG. 1 employs a thin ring-shaped inclusion l that covers the outer periphery of the bearing 6, but the embodiment shown in FIG. In other words, a plurality of ring-shaped grooves 3 are formed on the inner periphery of the boss hole 4, and a ring-shaped groove made of synthetic resin is formed in the ring-shaped groove 3. The inclusion 2 is attached. This inclusion 2 is made of synthetic resin or the like having a higher coefficient of thermal expansion than the orbiting scroll 7, as in the above embodiment. You can increase the effect. In the following embodiments, the shape and material of the inclusion are not limited to those described above, but the inclusion has a higher coefficient of thermal expansion than the orbiting scroll 7, and its end surface is similar to the boss hole 4 of the orbiting scroll 7 and the bearing 6. It is required that it be placed in contact with the

As is clear from the explanation of the effects of the invention, the unreleased Ill allows the orbiting scroll to rotate smoothly and has the effect of completely preventing the occurrence of creep.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged sectional view of an embodiment of the present invention, FIG. 2 is a partially enlarged sectional view of an embodiment of the present invention, and FIG. 3 is an axial sectional view showing a conventional orbiting scroll support structure. . 1.2・Fist e inclusion, 3φ・Groove, 4・φPos hole 5
e Reference crankshaft, 6 Φ bearing, 7 race and 11 growth scroll, 7A, 8A...-ler, puller. 8. Fixed scroll, 9. Co-rotating shaft, 10. Fist casing, 11. Fist inlet, 12. Discharge.

Claims (3)

[Claims] 1. In a support structure for an orbiting scroll that is pivotally supported on an eccentrically rotating crankshaft via a bearing, an inclusion made of a material having a higher coefficient of thermal expansion than the orbiting scroll is installed between the bearing and the orbiting scroll. An orbiting scroll support structure for a scroll compressor. 2. 2. The orbiting scroll support structure for a scroll compressor according to claim 1, wherein the inclusion is made of a synthetic resin material with respect to the orbiting scroll made of aluminum. 3. The orbiting scroll support structure for a scroll compressor according to claim 1, wherein the inclusion is entirely or partially interposed between the bearing and the orbiting scroll.