Abstract: This refrigeration system is an orifice-tube system constituting a refrigeration cycle in which a refrigerant passes through a compressor 1, a condenser 10, an orifice-tube 3, an evaporator 4, and an accumulator 5 in this order and then returns to the compressor 1. The condenser 10 is constituted by the so-called multi-flow type heat exchanger having a plurality of passes P1-P3. The intermediate pass P2 is constituted as a decompression pass for decompressing the refrigerant. After condensing the refrigerant by the first pass P1, the condensed refrigerant is decompressed and evaporated by the decompression pass P2, and then the evaporated refrigerant is re-condensed by the third pass P3. This refrigeration system is excellent in response characteristic to thermal load fluctuations and in refrigeration performance.

Abstract: A condenser includes a refrigerant inlet, a refrigerant outlet, a core portion having a refrigerant passage for introducing refrigerant from the refrigerant inlet to the refrigerant outlet while condensing the refrigerant, and decompressing means provided at a part of the refrigerant passage, the decompressing means decompressing a refrigerant pressure. The refrigerant passage located at an upstream side of the decompressing means condensates at least a part of high-pressure gaseous refrigerant into a liquified refrigerant. The decompressing means decompresses the liquified refrigerant into a low-pressure gaseous refrigerant. The refrigerant passage located at a downstream side of the decompressing means re-condensates the low-pressure gaseous refrigerant.

Abstract: An evaporator comprises a pair of upper and lower horizontal header tanks, a group of heat exchange tubes arranged laterally of the evaporator in front and rear two rows and each connected to the upper header tank and the lower header tank respectively, and a vertical partition wall provided inside the upper header tank and extending laterally of the evaporator so as to form sectioned header chambers for causing a refrigerant to flow through each pair of front and rear adjacent heat exchange tubes in directions opposite to each other. An inlet is provided for a liquid-vapor mixture refrigerant in a sectioned rear header chamber, and an outlet is provided for vaporized refrigerant in a sectioned front header chamber. The evaporator is 3 to 30% in channel opening ratio.

Abstract: A condenser includes a refrigerant inlet, a refrigerant outlet, a core portion having a refrigerant passage for introducing refrigerant from the refrigerant inlet to the refrigerant outlet while condensing the refrigerant, and decompressing means provided at a part of the refrigerant passage, the decompressing means decompressing a refrigerant pressure. The refrigerant passage located at an upstream side of the decompressing means condensates at least a part of high-pressure gaseous refrigerant into a liquified refrigerant. The decompressing means decompresses the liquified refrigerant into a low-pressure gaseous refrigerant. The refrigerant passage located at a downstream side of the decompressing means re-condensates the low-pressure gaseous refrigerant.

Abstract: A condenser includes a refrigerant inlet, a refrigerant outlet, a core portion having a refrigerant passage for introducing refrigerant from the refrigerant inlet to the refrigerant outlet while condensing the refrigerant, and decompressing means provided at a part of the refrigerant passage, the decompressing means decompressing a refrigerant pressure. The refrigerant passage located at an upstream side of the decompressing means condensates at least a part of high-pressure gaseous refrigerant into a liquified refrigerant. The decompressing means decompresses the liquified refrigerant into a low-pressure gaseous refrigerant. The refrigerant passage located at a downstream side of the decompressing means re-condensates the low-pressure gaseous refrigerant.

Abstract: A heat exchanger has flat tubes (1) parallelly arranged and spaced apart from each other a predetermined distance in the direction of thickness. The heat exchanger further has a pair of headers (5, 6) to which the ends of the tubes are connected in fluid communication. Each tube (1) has an intermediate bent portion (4) and straight sections (2, 3) separated one from another by the bent portion, and the bent portion (4) is a portion twisted at a predetermined helical angle relative to each straight section. Fins (11) are interposed between the adjacent straight sections (2), and further fins (12) between the other straight sections (3). The heat exchanger is easy to manufacture and of an improved efficiency of heat exchange, in spite of the tubes being bent in the direction of their width.

Abstract: A condenser particularly for use in automobile air conditioning system, the condenser including a pair of headers having their inner spaces divided by partitions so as to form a cooling medium flow path in a zigzag patterns including an inlet side group of paths and an outlet side group of paths, side group of paths is 30 to 60% of that of the inlet side group of paths.

Abstract: A condenser for use in air conditioning systems, including a core and headers, the core comprising tubes and corrugated fins sandwiched between the tubes, wherein:width of each tube: 6.0 to 20 mmheight of each tube: 1.5 to 7.0 mmheight of each coolingmedium flow path: 1.0 mm or moreheight of each fin: 6.0 to 16 mmfin pitch: 1.6 to 4.

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.

Abstract: A method of making a brazeable metal pipe which has elliptical tube-insertion apertures and guide lugs extending from at least one of the opposite edges defining the minor axis of each aperture, with the guide lugs extending in the direction of insertion of flat tubes. The method in an embodiment comprises the steps of: bending a part of a raw strip, which may be previously embossed to form recesses, so as to provide a bulged portion arc-shaped in cross section and connected to at least one unbulged flat portions; pressing inwardly to form inward swells; subsequently punching each inward swell to provide the tube-insertion aperture so that at least one of the opposite edges located at ends of the minor axis of said aperture remains unpunched; and finally bending the at least one unbulged portions to produce the finished pipe.

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.

Abstract: A heat exchanger includes a core and a pair of headers, the core including flat tubes and corrugated fins sandwiched between the tubes, the headers having holes in which the end portions of the tubes are inserted, wherein each tube comprises a stop means for ensuring that an adequate length of the tubes become inserted in the headers.

Abstract: A condenser apparatus includes a pair of headers provided in parallel with each other; a plurality of tubular elements whose opposite ends are connected to the headers; and fins provided in the air paths between one tube and the next. Each of the headers is made of a cylindrical pipe of aluminum. At least one of the headers is internally divided by a partition into at least two groups of coolant passageways, thus enabling the flow of coolant to make at least one U-turn in the header. The partition extends into the header through a slit in the header. Each of the tubular elements is made of a flat hollow tube of aluminum. The opposite ends of the tubular elements are inserted into slits produced in the headers so that they are liquid-tightly secured.

Abstract: A heat exchanger having a core and headers, the core including a plurality of tubular elements having tanks at respective ends and corrugated fins sandwiched between one tubular element and the next, and the headers being provided at corners of the core to introduce a cooling medium and discharge it out of the core, wherein each header comprises a flat body portion and a cylindrical head portion produced eccentric of the body portion so that each header is disposed at the corner of the core without allowing any portion thereof to protrude beyond the outside line of the heat exchanger.

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.

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 os that they are liquid-tightly soldered therein.

Abstract: A stack type heat exchanger which comprises a plurality of tubular elements including a tank section at least at one end, the tubular elements being adapted to allow a heat exchange medium to pass through; a plurality of air paths interposed between one tubular element and the next, each of the air paths being provided with a fin member; wherein each tubular element comprises a pair of metal tray members jointed at their peripheries with an inner plate interposed therebetween; wherein each inner plate is provided with projections on its top surfaces and undersurface so that the flows of the medium are blocked by the projections so as to enlarge the effective area for heat transfer between the medium and the tubular element.

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.

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 question raised in reexamination request Nos. 90/003,544, filed Aug. 24, 1994, 90/003662, filed Dec. 16, 1994, 90/003796, filed Apr. 19, 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. as provided in 37 CFR 1.570(e).

Abstract: A condenser apparatus includes a pair of headers provided in parallel with each other; a plurality of tubular elements whose opposite ends are connected to the headers; and fins provided in the air paths between one tube and the next. Each of the headers is made of a cylindrical pipe of aluminum. At least one of the headers is internally divided by a partition into at least two groups of coolant passageways, thus enabling the flow of coolant to make at least one U-turn in the header. The partition extends into the header through a slit in the header. Each of the tubular elements is made of a flat hollow tube of aluminum. The opposite ends of the tubular elements are inserted into slits produced in the headers so that they are liquid-tightly secured.