JPH02245489A - Scroll compressor - Google Patents

Abstract

PURPOSE:To increase the strength and maintain the compression performance of a lap by forming the start portion of lapping of an aluminum turning scroll lap with an involute curve on the outer side of the lap and with a circular shape not in contact with the start portion of lapping of a fixed scroll lap on the inner side of it. CONSTITUTION:Since the spiral lap 1 of a turning scroll is provided with a circular or arc roundness section 1d in addition to a conventional wedge-shaped lap 1C, its durability to repeated gas compression load is, increased. The start portion of lapping is formed with a circular involute curve 1a on its outer side and with a circular involute curve 1b and circular or arc roundness 1d on its inner side. Both merits of compression performance to be obtained by the conventional wedge-shaped lap and increased strength to be obtained by a bulb-shaped lap are achieved by this form of the lap. Thus the form is most suitable for aluminum scroll.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the shape of an aluminum scroll wrap in a scroll-type compressor applied to a compressor for air conditioning and refrigeration products.

[Conventional technology]

In the conventional device, as described in Japanese Utility Model Application Publication No. 61-5887, the beginning of the scroll wrap is bulb-shaped and rounded to avoid stress concentration at the base. This improved the fatigue strength against the compressed gas repeatedly applied to the roots and increased durability.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, since the beginning of the wrap is bulb-shaped and the base is rounded, the arrangement is not made to maintain the airtightness of the compressed gas, and a dead volume is generated.
There was a problem that the performance was inferior to the wedge-shaped two-tube.

In addition, since it is bulb-shaped, the set volume ratio is small, and there is one problem in ensuring performance at the specification point when applied to air conditioners.

An object of the present invention is to improve the fatigue strength of an aluminum scroll wrap without deteriorating its performance.

[Means to solve the problem]

In order to achieve the above object, the starting part of the aluminum orbiting scroll wrap has an involute curve on the outside and a maximum circular or arcuate shape on the inside that does not contact the starting part of the fixed scroll wrap.

Furthermore, in order to improve durability, a mark @R is provided on a circular or arc-shaped portion.

[Effect]

The outer side of the aluminum scroll wrap at the beginning of the winding is involute, ensuring the same compressed gas airtightness as conventional products with respect to the fixed scroll. On the other hand, since the inner side of the winding start part is circular, the strength is increased and the durability against repeated compressed gas loads applied to this part is improved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a partial perspective view of the beginning of winding the orbiting scroll wrap in the scroll pressure machine of this embodiment, and FIG. 2 is a partial perspective view of FIG. 1 from a different perspective.

Here, the spiral wrap 1, which is formed upright on a base plate 2 (not shown), has a rounded shape 1d formed by a circle or an arc in addition to the conventional wedge-shaped 2pupu IC as the winding start part.
This provides a scroll wrap with improved durability against repeated gas compression loads. Here, the wrap starting portion is geometrically formed by a curved line consisting of a circular involute curve la on the outside of the wrap, a circular involute curve 1b on the inside of the wrap, and a circle or circular arc forming a roundness ld. .

Next, FIG. 3 shows a partial perspective view of the wrap starting portion of another invention, and FIG. 4 shows a longitudinal cross-sectional view at the I-1 position. Here, the durability can be further improved than in the embodiment shown in Fig. 1 by providing an radius R to the curved range of the roundness ld formed by an arc at the base plate 2 and the two upright claws l. be.

As mentioned above, durability can be improved by providing the wrap start part of the orbiting scroll member with a circular involute shape on the outside and a rounded shape on the inside, but in public examples aimed only at improving durability, The so-called bulb-shaped wrap of the present invention, which has a larger roundness, has been rejected, but its application to a scroll compressor that efficiently sucks, compresses, and discharges gas is difficult to ensure performance compared to the wedge-shaped wrap. There is.

FIGS. 5 to 3 show the present invention and the conventional example in which the fixed scroll 3 and the orbiting scroll 4 are engaged with each other immediately before gas compression is completed during the suction/compression operation of the scroll pressure a machine and immediately before discharge. This is what is shown. Here, Fig. 6 shows the so-called wedge-shaped wrap that has the best gas compression performance, and Fig. 7 shows the wedge-shaped wrap at the start of winding, with part of the performance being S-like in order to ensure the strength of the tip end. established, 3rd
The figure shows a so-called bulb-shaped wrap, which is by far the strongest in terms of strength, but has drawbacks when the overcompression loss during the discharge process is large and the total adiabatic efficiency is poor, whereas the wrap of the present invention In terms of performance, it has a wedge shape, and in terms of strength, it is close to a bulb shape, so it is possible to ensure strength without making the performance uniform as a high-speed scroll wrap using aluminum material.

〔Effect of the invention〕

According to the present invention, it is possible to have the advantages of both the compression performance of the wedge-shaped two-bubble wrap and the strength improvement of the bulb-shaped wrap, so it is suitable for use in an aluminum scroll wrap.

Furthermore, the existing wedge-shaped wrap can be used as is for the fixed scroll member.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view of the beginning of wrapping according to an embodiment of the present invention, FIG. 2 is a partial perspective view of the embodiment shown in FIG. 1 from a different direction, and FIG. 3 is a perspective view of another embodiment. Figure 4 is the third
It is a longitudinal cross-sectional view of the seal line position of a figure. Figures 5 to 3 are diagrams that model the mating state of the fixed scroll and the orbiting scroll immediately before the discharge of compressed gas. Figure 6 shows a wedge-shaped wrap with a radius at the beginning of the roll, Figure 7, and Figure 3 shows a bulb-shaped wrap. 1... Wrap 1a... Involute curve on the outside of the wrap 1b... Involute curve on the inside of the wrap 1c... Wedge-shaped wrap 1d... Roundness 2
...Bedplate 8...Fixed scroll 4...Rotating Suro 3 Figure 10 Figure 5 Figure 60 U-Riff 0 a Raishi Lipta 1 I Job 11 311 Jo 1 Nuku D-1 Shi 4 ) Kaise 4 Scroll Rele

Claims (4)

[Claims] 1. The wraps of the orbiting scroll and the fixed scroll, which have spiral-shaped wraps standing upright on the base plate, are engaged with each other at different angles, and the outer wall surfaces of the wraps come into contact to form a sealed space within the spiral-shaped wrap. In a scroll compressor in which the closed space is moved to the center of the spiral wrap by rotating the orbiting scrolls without rotating them,
A scroll compressor characterized in that the wrap start portion of an orbiting scroll member has a circular involute shape on the outside and a rounded shape on the inside. 2. Scroll compressor according to claim 1, characterized in that the inside of the wrap start portion of the orbiting scroll member is rounded, and the root portion standing upright on the base plate is rounded. . 3. The scroll compressor according to claim 1, wherein the fixed scroll member and the orbiting scroll member are made of different materials, and the orbiting scroll member has a smaller specific gravity. 4. 4. A scroll compressor according to claim 3, wherein the fixed scroll member is made of iron-based casting material and the orbiting scroll member is made of aluminum material.