JPS6332182A - Scroll compressor - Google Patents

Abstract

PURPOSE:To remove the quantity of unbalance of a rotary scroll and improve reliability by forming a cut off part which makes the position of the center of gravity of a rotary scroll agree with the center of a crankshaft, on the boss part of said rotary scroll having a bearing recess part on which said crankshaft is rotatably installed. CONSTITUTION:A rotary scroll 4 is formed with a boss part 4B which is projected out in the opposite direction from a lap 4A on an end plate 4C and a bearing recess part 4D into which a bearing is fitted and which is recessedly provided on the center part inside the boss part 4B. On the outer periphery of the boss part 4B, cut off parts 1-3 are formed by cutting off the outer edge of the boss part, by appropriate arc lengths in the circumferential direction and by appropriate depths into the end plate 4C. Thereby, the unbalance of the rotary scroll 4 due to the lap 4A can be removed, making the center of gravity of the rotary scroll 4 agree with the center of the bearing recess part 4D which is the center of a crankshaft, enabling smooth rotation and improving the reliability of a scroll compressor.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention forms a curve consisting of an involute curve, engages with a fixed scroll, and eliminates the unbalance amount of an orbiting scroll which rotates and slides while being restrained from rotating. The present invention relates to a scroll compressor suitable for.

Conventional technology The general structure of the scroll compressor will be explained with reference to FIG.

A main shaft 7 rotated by a prime mover (not shown) is pivotally supported within the casing 6, and an orbiting scroll 4 is pivotally supported via a bearing 9 on a crankshaft 8 formed eccentrically at the tip thereof. The lower surface wrap 7A of the orbiting scroll 4 engages with the side surface wrap 5A of the IM constant scroll 5L integrally formed on the casing 6 side, and compresses the medium introduced into the space formed therebetween. The orbiting scroll 4 is slidably supported on the casing 6 side, and rotates and slides while being restrained from rotating by an Oldham joint 10. Note that the Oldham joint 10 engages with the orbiting scroll 4 and also engages with the casing 6 side.

The main shaft 7 has a balance weight 1 for removing unbalance caused by the rotating and sliding movement of the scroll 4.
1 is formed. On the other hand, the wrap 4A formed on the rental scroll 4 is extended from its center in a spiral shape along an involute curve, so the central axis of the orbiting scroll (
It is formed eccentrically with respect to the center of the crankshaft 8. That is, the center of gravity of the orbiting scroll 4 is eccentrically formed.

Therefore, in order to eliminate vibrations and the like during operation, it is necessary to eliminate the eccentricity of the orbiting scroll 4.

In the prior art, as shown in FIG. 4, a means for correcting the balance has been adopted by forming a cutout 12 on the outer edge surface of a flange plate-like end plate 4C on which a wrap 4A is erected.

Problems to be Solved by the Invention As shown in FIG. 4, the orbiting scroll 4 has a lower surface 4A, a flange plate-like mirror plate 4C that stands up from the lower surface, and a center plate 4A that protrudes from the opposite side of the surface 4A. It is formed from a boss portion 4B and the like in which a bearing hole 4D is provided in which the bearing 9 is mounted. As described above, the prior art balance correcting means generally employs one in which a cutout f%12 is formed on the outer edge surface of the end plate 4C at a position opposite to the extending direction of the wrap 4A. As a result, the unbalance amount based on the wrap 4A is removed, but the missing portion 12 has an appropriate [[J dimension a and depth b?] as shown in the figure. As a result, the flange width (indicated by the dimension m) of the end plate 4C becomes wider and the flange thickness (indicated by the dimension t) of the end plate 4C becomes thinner. That is, when the flange width (+iii) becomes wider, the entire orbiting scroll 4 becomes larger, which causes an increase in weight and cost. Also, the mirror plate 4C is the wrap 4A.
Pressure 1i (pressure from the medium) occurs from the side, so if the thickness of the seven lunges becomes thinner, there is a risk of insufficient strength, and this will cause the entire structure to become heavier, resulting in defects.

The present invention solves the above-mentioned deficiencies, etc., and eliminates the unbalance I4 of the orbiting scroll, and also provides a scroll pressure fa that can be formed small and light and improve its reliability.
The aim is to provide the following.

Means for Solving the Problems For this purpose, the present invention provides a boss portion of the orbiting scroll that is formed on the opposite side of the wrap to protrude from the end plate, so that the center of gravity of the eccentric gravity of the orbiting scroll caused by the wrap coincides with the center axis of the orbit. A scroll compressor is constructed by forming a missing portion.

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

As shown in FIGS. 1 and 2, the orbiting scroll 4 includes an end plate 4C, a mirror plate 4A, m,
Boss M4B protruding in the opposite direction to the lap 4A of plate 4C
and a bearing recess 4D, which is recessed in the center of the boss portion 4B and into which a bearing is fitted. Further, the wrap 4A is formed to extend from the center of the end plate 4C along an involute curve, as shown by outline lines in FIG. 1, and to expand rightward in the figure. Therefore, the center of gravity 4M of the orbiting scroll is determined at a position closer to the right in the figure from the center point.

On the outer periphery of the boss portion 4B, a cutout portion 1°2.3 is formed by cutting off the outer edge portion and extending by an appropriate arc in the circumferential direction. The missing portion 1.2.3 is formed by sinking into the end plate 4C by an appropriate depth. Missing part ■ is longer than missing part 2.3・ii! The cutout portion 3 is formed to have a slightly harder arc length than the cutout portion 2. The reason why the lengths are different is that the size of the missing portions 1, 2, and 3 must be determined in accordance with the extended shape of the involute curve of the wrap 4A, as described above, and is not limited to the one shown in the figure. (+!L, Since one of the purposes is to reduce the weight of the orbiting scroll 4, as shown in the figure, the unbalance amount is removed by a plurality of missing parts 1.2.3, and the light r around the boss part 4B is
l) It is desirable to aim for

Of course, the missing parts 1, 2, and 3 and their shapes are not limited to those shown in the drawings.

By appropriately forming the missing portions 1.2.3 in the boss portion 4B as described above, the unbalance is removed by the wrap 4A, and the center of gravity of the orbiting scroll 4 is centered at its center, that is, the bearing hole 4.
It can be matched to the center of the depression. As a result, the load on the crankshaft 8 due to the deviation of the center of gravity of the orbiting scroll 4 is reduced, 1 smooth orbiting and sliding movement is obtained, and stability and reliability are improved. Compression and evacuation occur smoothly. Furthermore, unlike the conventional technique, the boss part 4B
It is miniaturized by forming a missing part 1.2.3 in the
Moreover, as mentioned above, the effect of reducing the weight is also increased.

As is clear from the explanation of effects of the invention, according to the present invention, the unbalance of the orbiting scroll is eliminated, and its stability is improved.
Reliability is improved, and the advantage is that it can be made lightweight and compact.

[Brief explanation of the drawing]

Fig. 1 is a plan view of one embodiment of the present invention, and Fig. 2 is an H of Fig. 1.
-IT line sectional view, FIG. 3 is an axial sectional view showing an example of the overall structure of a scroll compressor, and FIG. 4 is an axial sectional view showing an orbiting scroll provided with conventional/Herans correction means. 1.2.3.12...Missing part, 4...Turning space'1O
-) Lt, 4A, 5A --- Lap, 4B-@
Post part, 4C... end plate, 4D--e bearing recess m, 4M
-・#Center of gravity of orbiting scroll, 5...φ fixed scroll, 6@-e casing, 711...l: shaft, 8...crankshaft, 911@・bearing. 10... Φ Oldham J11 hair, 11... φ balance weight.

Claims (1)

[Claims] A scroll compressor having an orbiting scroll having a wrap that engages with the wrap of a fixed scroll, and a boss portion formed to protrude in the opposite direction to the wrap and forming a bearing recess to which a crankshaft is pivotally attached. A scroll compressor characterized in that the boss portion of the orbiting scroll is provided with a cutout portion that aligns the center of gravity of the orbiting scroll with the center of the crankshaft.