US RE35,655 EGranted

Condenser for use in a car cooling system

AssigneeShowa Aluminum Corporation

InventorsRyoichi Hoshino, Hironaka Sasaki, Takayuki Yastuake

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Abstract

A condenser adapted for use in the car cooling system, the condenser comprising a pair of headers provided in parallel with each other; a plurality of tubular elements whose opposite ends are connected to the headers; fins provided in the air paths between one tube and the next; wherein each of the headers is made of a cylindrical pipe of aluminum; wherein each of the tubular elements is made of a flat hollow tube of aluminum by extrusion; and wherein the opposite ends of the tubular elements are inserted into slits produced in the headers so that they are liquid-tightly soldered therein. The questions raised in reexamination request No. 90/003,919, filed Aug. 7, 1995, have been considered and the results thereof are reflected in this reissue patent which constitutes the reexamination certificate required by 35 U.S.C. 307 as provided in 37 CFR 1.570(e). This is a Reissue of a Patent which was the subject of a Reexamination Certificate No. B1 5,190,100, dated Aug. 30, 1994, Request No. 90/003,073, Jun. 3, 1993.

Claims2

Dependent claims

A condenser for liquefying gaseous coolant in an air conditioning system of an automobile after the system has compressed the coolant, said condenser comprising:

(i) a plurality of flat tubular elements defining flow paths and disposed in a spaced, substantially parallel relation, each element including at least one inside wall;
(ii) a plurality of fin members, each fin member disposed between adjacent tubular elements;
(iii) a pair of headers disposed in a spaced, substantially parallel relation at opposite ends of the tubular elements, the one and/or the other header defining a coolant inlet and a coolant outlet for the condenser, each header being a substantially round, elongate member and defining, for each tubular element, an opening through which it receives the tubular element and establishes fluid communication with the element;
(iv) at least one partitioning plate mounted in one of the header transversely of the header to divide the inside opening of the header, said plate including a first portion which extends into a slit in the header and a second portion which is generally co-extensive with the inside opening of the header, said second portion of the partitioning plate being without any perforations;
the coolant flowing from the inlet into one header and making a first pass through a plurality of the tubes to the other header, the coolant also making a final pass through a plurality of tubes to the outlet, the tubular elements and headers forming a first zone which receives gaseous coolant from the inlet and a final zone through which the coolant flows before discharging through the outlet, the effective cross sectional area of the flow paths defined by the tubular elements through which the coolant makes the final pass being smaller than the effective cross sectional area of the flow paths of those through which the coolant makes the first pass;
said condenser being able to resist internal pressures greater than 10 atmospheres.

3 more elements

The condenser of claim 1, in which one header defines the inlet and outlet and includes the partitioning plate. 3. The condenser of claim 1, in which each header has at least one partition and wherein the coolant makes a second pass between the first and the final passes through a plurality of tubular elements. 4. A condenser as defined in claim 3, wherein the effective cross-sectional area of the coolant passageways formed through the tubular elements is reduced stepwise from the first pass, to the second pass, to the final pass. 5. A condenser as defined in claim 4, wherein the number of the tubular elements is reduced stepwise from the first pass towards the final pass. 6. A condenser as defined in claim 1, wherein each header is a clad pipe having either one or both of its surfaces coated with the brazing agent layer. 7. A condenser as defined in claim 1, wherein each header is a seam-welded pipe. 8. A condenser as defined in claim 1, wherein the partitioning plate is a disc which has a large diameter portion and a small diameter portion. 9. A condenser as defined in claim 1, wherein the tubular elements are extruded, elongate members. 10. A condenser as defined in claim 1, wherein each tubular element is a seam-welded pipe. 11. A condenser as defined in claim 1, wherein the tubular elements have:

a width of 6-12 mm;
a height of 5 mm or less;
and
the flow path within each tube being 1.8 mm or more in height;
and
each fin member having
a height of 8-16 mm;
and
the pitch of the fin members being 1.6-3.2 mm. 12. A condenser as defined in claim 1, wherein the headers, tubular elements, fin members and partitioning plate are made of an aluminum alloy. 13. A condenser as defined in claim 1, wherein each tubular element has an elongate cross-section and the inside wall of the tubular element extends between opposite outer walls of the element. 14. A condenser as defined in claim 1, wherein the inside wall is continuous and extends along substantially the entire length of the tubular element.

6 more elements

Dependencies are inferred from the claim text.