Scroll type device incorporating spinning or co-rotating scrolls
A co-rotating scroll is disclosed having a motor having a shaft, a drive scroll connected to the shaft for moving the drive scroll, a driven scroll connected to the drive scroll to be moved by the drive scroll, and an idler shaft for aligning the drive scroll and the driven scroll and for allowing the driven scroll to be moved by the drive scroll.
1. A co-rotating scroll comprising:
a motor having a drive shaft;
a drive scroll connected to the drive shaft, the drive scroll comprising a first bearing having a first centerline and comprising a first alignment aperture;
a driven scroll connected to the drive scroll, the driven scroll comprising a second bearing having a second centerline offset from the first centerline and also comprising a second alignment aperture, the first alignment aperture alignable with the second alignment aperture; and
an eccentric idler shaft comprising:
a first portion operably connected to the first bearing; and
a second portion operably connected to the second bearing, the second portion offset from the first portion;
wherein each of the first portion and the second portion have a hole provided therein.
2. The co-rotating scroll of claim 1 , further comprising a second eccentric idler shaft and a third eccentric idler shaft.
3. The co-rotating scroll of claim 2 , wherein the eccentric idler shaft, the second eccentric idler shaft, and the third eccentric idler shaft are configured to limit movement of the driven scroll relative to the drive scroll.
4. The co-rotating scroll of claim 1 , wherein:
the drive scroll further comprises a first involute and a balance weight positioned on the first involute to dynamically balance the drive scroll.
5. The co-rotating scroll of claim 4 , wherein the driven scroll further comprises a second involute and a counterweight positioned on the second involute to dynamically balance the driven scroll.
6. The co-rotating scroll of claim 4 , further comprising a second balance weight, and wherein the balance weight and the second balance weight are located coaxially with the first involute.
7. The co-rotating scroll of claim 1 , further comprising a compression chamber formed between a first involute of the drive scroll and a second involute of the driven scroll.
8. The co-rotating scroll of claim 7 , wherein the first involute comprises a first tapered tip seal in contact with the driven scroll, and the second involute comprises a second tapered tip seal in contact with the drive scroll, the first tapered tip seal and the second tapered tip seal configured to seal the compression chamber.
9. The co-rotating scroll of claim 1 , wherein the first bearing and the second bearing are grease bearings.
10. The co-rotating scroll of claim 9 , wherein each of the first bearing and the second bearing comprises a bearing shield.
11. The co-rotating scroll of claim 1 , wherein one or more of the first bearing and the second bearing is retained in place by a bearing cover.
12. The co-rotating scroll of claim 1 , wherein the hole in the first portion of the eccentric idler shaft is empty.
13. The co-rotating scroll of claim 1 , wherein the hole in the second portion of the eccentric idler shaft is empty.
14. The co-rotating scroll of claim 1 , further comprising a lock nut and a lock washer configured to retain the eccentric idler shaft on the first bearing.
15. The co-rotating scroll of claim 1 , further comprising a lock nut and a lock washer configured to retain the eccentric idler shaft on the second bearing.
16. A co-rotating scroll device comprising:
a drive scroll comprising a first alignment aperture, a first involute and a first tapered tip seal;
a driven scroll comprising a second alignment aperture, a second involute and a second tapered tip seal, the first alignment aperture alignable with the second alignment aperture;
a compression chamber formed between the first involute and the second involute, with the first tapered tip seal positioned adjacent the driven scroll and the second tapered tip seal positioned adjacent the drive scroll;
a plurality of idler shafts extending from the drive scroll to the driven scroll, each idler shaft supported by an idler shaft bearing in the drive scroll and an idler shaft bearing in the driven scroll;
a drive shaft operably connected to the drive scroll, the drive shaft supported by a plurality of drive shaft bearings; and
an electric motor operably connected to the drive shaft, the electric motor configured to drive the drive scroll via the drive shaft.
17. The co-rotating scroll device of claim 16 , wherein the first tapered tip seal has a maximum width adjacent the driven scroll, and the second tapered tip seal has a maximum width adjacent the drive scroll.
18. The co-rotating scroll device of claim 16 , wherein the first tapered tip seal is self-actuating when the electric motor drives the drive scroll.
19. A co-rotating scroll device comprising:
a drive scroll comprising a first alignment aperture, a first involute and three first idler shaft bearings evenly spaced around the first involute;
a driven scroll comprising a second alignment aperture, a second involute and three second idler shaft bearings evenly spaced around the second involute, the first alignment aperture alignable with the second alignment aperture;
three eccentric idler shafts, each extending between one of the three first idler shaft bearings and one of the three second idler shaft bearings;
a chamber formed between the first involute and the second involute; and
a first tapered tip seal positioned between the first involute and the driven scroll, and a second tapered tip seal positioned between the second involute and the drive scroll.
20. The co-rotating scroll device of claim 19 , wherein the first tapered tip seal is tapered away from the driven scroll, and the second tapered tip seal is tapered away from the drive scroll.