Claims
- 1. A stacked type duplex heat exchanger comprising:
- a plurality of plate-shaped tubular elements, wherein each tubular element of said plurality of tubular elements has a thickness such that each tubular element of said plurality of tubular elements stacked in a direction of said thickness of each tubular element of said plurality of tubular elements, and each tubular element of said plurality of tubular elements is composed of a pair of complementary shaped core plates having bulged header portions and bulged tubular portions, said core plates being placed back to back in order for said bulged header portions to form at least first and second sets of headers and said bulged tubular portions to form at least first and second flat tubular segments, said first set of headers with each header having a longitudinal axis and said second set of headers with each header having a longitudinal axis such that each of said longitudinal axes of said first set of headers is offset from each of said longitudinal axes of said second set of headers, respectively, in a direction parallel with a longitudinal axis of said core plates, said first flat tubular segment being divided from said second flat tubular segment in a direction of air flow passing through said adjacently stacked tubular elements of said duplex heat exchanger so that each said first and second flat tubular segments have at least one flow path for heat exchanging media, said at least one flow path in said first flat tubular segment being separate from said at least one flow path in said second flat tubular segment so that said at least one flow path in said first flat tubular segment only communicates with said at least one flow path in said first flat tubular segments of adjacent tubular elements through said first set of headers formed by said bulged header portions and said at least one flow path in said second flat tubular segment only communicates with said at least one flow path in said second flat tubular segments of adjacent tubular elements through said second set of headers formed by said bulged header portions, wherein said at least one flow path in said first flat tubular segment communicating with said at least one flow path in said first flat tubular segment of said adjacent tubular element through said first set of headers form a first independent heat exchanger unit and said at least one flow path in said second flat tubular segment communicating with said at least one flow path in said second flat tubular segment of said adjacent tubular element through said second set of headers form a second independent heat exchanger unit, said first and second independent heat exchanger units being formed integrally with each other to constitute said duplex heat exchanger;
- at least one cutout having a long length and a narrow width in said direction of air flow passing through said adjacently stacked tubular elements of said duplex heat exchanger provided between said first and second flat tubular segments so as to thermally insulate said at least one flow path in said first flat tubular segment from said at least one flow path in said second flat tubular segment; and
- a plurality of fins with each fin placed between adjacently stacked tubular elements.
- 2. The stacked type duplex heat exchanger as defined in claim 1, wherein each tubular element of said plurality of tubular elements are stacked horizontally one on top of another.
- 3. The stacked type duplex heat exchanger as defined in claim 2, further comprising a filler connected to an uppermost tubular element of said plurality of tubular elements, and a drain connected to a lowermost tubular element of said plurality of tubular elements.
- 4. The stacked type duplex heat exchanger as defined in claim 3, wherein said filler comprises a dome integral with and protruding from an upper core plate of said uppermost tubular element of said plurality of tubular elements, and a discrete cup-shaped filler neck brazed to said dome, so that said dome communicates with said filler neck through openings that are formed through portions of said dome and said neck, wherein said dome and said neck are in contact with each other.
- 5. The stacked type duplex heat exchanger as defined in claim 3, wherein said drain comprises a small pan integral with and protruding from a lower core plate of said lowermost tubular element, and a discrete drain cock connected to said small pan in fluid communication therewith.
- 6. The stacked type duplex heat exchanger as defined in claim 1, wherein each tubular element of said plurality of tubular elements are stacked vertically side by side each other.
- 7. The stacked type duplex heat exchanger as defined in any one of claims 1, 2 or 6, wherein a first flow path for a first heat exchanging medium is formed along and within a first side region of each tubular element of said plurality of tubular elements so that said first heat exchanger unit which comprises said first flow path serves as a condenser, whereas a second flow path for a second heat exchanging medium is formed along and within a second side region of each tubular element of said plurality of tubular elements so that said second heat exchanger unit which comprises said second flow path serves as a radiator.
- 8. The stacked type duplex heat exchanger as defined in claim 7, wherein an inner fin is secured in each of said first flow paths serving as said condenser.
- 9. The stacked type duplex heat exchanger as defined in claim 1, wherein said core plate is made of a brazing sheet that comprises a core sheet having both surfaces clad with a brazing agent layer.
- 10. The stacked type duplex heat exchanger as defined in claim 1, wherein a pair of lugs protrude outwardly from first and second ends of at least one core plate having lateral sides, a slot-shaped cutout disposed intermediate said lateral sides of said at least one core plate extends along a length thereof excluding said first and second ends so that belt-shaped sections are formed beside said at least one cutout, and a plurality of straight and parallel flat grooves are formed in each belt-shaped section so as to extend from a first lug of said pair of lugs located at said first end to a second lug of said pair of lugs located at said second end of said at least one core plate, wherein each groove has a bottom protruding a distance outwardly from said at least one core plate, each groove has a bottom protruding a distance outwards from said at least one core plate, and each groove is adjacent another groove and is separated by a straight rib protruding inwardly.
- 11. The stacked type duplex heat exchanger as defined in claim 1, wherein each fin extends between said first and second tubular segments of each tubular element of said plurality of tubular elements, and at least one cutout is present corresponding to said at least one cutout formed in said first and second tubular segments and through a middle portion extending intermediate and along first and second lateral sides of said first and second tubular segments.
- 12. The stacked type duplex heat exchanger as defined in claim 1, wherein each fin of said plurality of fins is a corrugated fin made of aluminum.
- 13. The stacked type duplex heat exchanger as defined in claim 1, wherein hooks for holding fan shrouds are formed integrally with at least selected ones of said plurality of tubular elements.
Priority Claims (2)
Number |
Date |
Country |
Kind |
6-073276 |
Apr 1994 |
JPX |
|
6-207332 |
Aug 1994 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/420,371 filed Apr. 11, 1995, now abandoned.
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Continuations (1)
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Number |
Date |
Country |
Parent |
420371 |
Apr 1995 |
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