US3921713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: H B ZACHRY Co
•
Filing: 1973-12-26
•
Granted: 1975-11-25
•
Expires: 1993-12-26
Abstract
Abstract A novel heat exchanger is formed by using alternating smooth and dimpled, thin, thermally conductive strips which are wound in a spiral to form the closed passageways for fluid between the strips and retain between an outer retaining and fluid distribution ring and an inner retaining and fluid distribution ring. The strips have means for sealing and insulating the periphery in a fluid tight manner. The dimpled strips have dimples extending from each side of the strip the size determining the fluid capacity of the passageways. The smooth and dimpled strips are used in pairs enabling two, four, etc., fluids to be passed either in concurrent or counter-current flow so as to provide an efficient heat exchanger which may be easily taken apart and cleaned for good service.
Inventors
- 👤 Emanuel Schnitzer
- 👤 Sr Thomas M Grubbs
- 👤 Kornel Nagy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:44
CPC Classifications
F; F28; F28D; F28D9/00; F28D9/04; Y; Y10; Y10S; Y10S165/00; Y10S165/355; Y10S165/398
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
126 words
A heat exchanger which comprises: an outer retaining and fluid distribution ring, at least one pair of alternating smooth and dimpled thin, thermally conductive strips wound in a spiral which are attached to said outer fluid distribution ring at different points, said dimpled strip having dimples extending substantially outwardly from the plane of said dimpled strip from each side of said strip, an inner retaining and fluid distribution ring to which said strips are attached at spaced points, and means for sealing and insulating the side edge of said strips in a fluid tight manner thereby forming at least two closed passageways between said thermally conductive strips in spiral pathways between said outer retaining and fluid distribution ring and said inner retaining and fluid distribution ring.
Claim 2
Dependent Claim
126 words
A heat exchanger which comprises: an outer retaining and fluid distribution ring, at least one pair of alternating smooth and dimpled thin, thermally conductive strips wound in a spiral which are attached to said outer fluid distribution ring at different points, said dimpled strip having dimples extending substantially outwardly from the plane of said dimpled strip from each side of said strip, an inner retaining and fluid distribution ring to which said strips are attached at spaced points, and means for sealing and insulating the side edge of said strips in a fluid tight manner thereby forming at least two closed passageways between said thermally conductive strips in spiral pathways between said outer retaining and fluid distribution ring and said inner retaining and fluid distribution ring.
Claim 3
Dependent Claim
42 words
A heat exchanger according to claim 1 wherein there are two fluid ports in said outer retaining and fluid distribution ring and said inner retaining and fluid distribution ring for each pair of spiral strips, said ports communicating with said closed passageways.
Claim 4
Dependent Claim
13 words
A heat exchanger according to claim 1 wherein four strips are alternatively spiraled.
Claim 5
Dependent Claim
31 words
A heat exchanger according to claim 1 wherein the dimpled strip has dimples on both sides of substantially the same size and shape forming closed passageways of the same fluid capacity.
Claim 6
Dependent Claim
36 words
A heat exchanger according to claim 1 wherein the dimpled strip has dimples on one side of substantially different size and shape than the dimples on the other side forming closed passageway of different fluid capacity.
Claim 7
Dependent Claim
42 words
A heat exchanger according to claim 1 wherein the ends of said strips have enlarged portions greatEr than the thickness of the strip and are held in slots in said inner and outer retaining and fluid distribution rings by said enlarged portions.
Claim 8
Dependent Claim
22 words
A heat exchanger according to claim 6 wherein the ends of said strips are sealed by filling said slots with a sealant.
Claim 9
Dependent Claim
27 words
A heat exchanger according to claim 6 wherein said slots are formed by drilled holes and slits in said inner and outer retaining and fluid distribution rings.
Claim 10
Dependent Claim
34 words
A heat exchanger according to claim 1 wherein the dimpled strip has dimples on one side of substantially different size than the dimples on the other side forming closed passageways of different fluid capacity.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |