An upper header tank of an evaporator is formed by three plates. The outside plate has an inflow-side refrigerant-passage outwardly bulging portion whose one end portion communicates with a refrigerant inlet. The inside plate has tube insertion holes. The intermediate plate has communication holes f
An upper header tank of an evaporator is formed by three plates. The outside plate has an inflow-side refrigerant-passage outwardly bulging portion whose one end portion communicates with a refrigerant inlet. The inside plate has tube insertion holes. The intermediate plate has communication holes for establishing communication between the tube insertion holes of the inside plate and the outwardly bulging portion of the outside plate. The communication holes of the intermediate plate are connected by communication portions so as to form a resin passage communicating with the outwardly bulging portion. Of all the communication portions of the refrigerant passage, a plurality of upstream communication portions are smaller in width than the remaining communication portions. The relation 0.25≦A/B≦0.35 is satisfied, where A represents the number of the narrow communication portions, and B represents the total number of the communication holes which form the refrigerant passage.
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What is claimed is: 1. A heat exchanger comprising upper and lower header tanks disposed apart from each other, and a plurality of heat exchange tubes disposed in parallel between the two header tanks and having opposite end portions connected to the respective header tanks, wherein each of the hea
What is claimed is: 1. A heat exchanger comprising upper and lower header tanks disposed apart from each other, and a plurality of heat exchange tubes disposed in parallel between the two header tanks and having opposite end portions connected to the respective header tanks, wherein each of the head tanks is configured such that an outside plate, an inside plate, and an intermediate plate intervening between the outside and inside plates are brazed together in layers; each of the outside plates of the upper and lower header tanks has a plurality of outwardly bulging portions each extending in the left-right direction and having an opening closed by the intermediate plate; the inside plate has a plurality of tube insertion holes in the form of through-holes formed in a region corresponding to the outwardly bulging portions of the outside plate and spaced apart from one another along the left-right direction; the intermediate plate has a plurality of communication holes in the form of through-holes so as to allow the respective tube insertion holes of the inside plate to communicate with the interiors of the corresponding outwardly bulging portions of the outside plate; opposite end portions of the heat exchange tubes are inserted through the respective tube insertion holes of the inside plates of the two header tanks and are brazed to the inside plates; at least one outwardly bulging portion of each of the upper and lower header tanks serves a refrigerant-passage outwardly bulging portion within which refrigerant flows in the longitudinal direction; the refrigerant-passage outwardly bulging portion of the upper header tank serves as an inflow-side refrigerant-passage outwardly bulging portion whose one end portion communicates with a refrigerant inlet formed in the upper header tank; the communication holes of the intermediate plates communicating with the refrigerant-passage outwardly bulging portions of the upper and lower header tanks are connected by means of communication portions each formed between adjacent communication holes of the intermediate plates; and the communication holes communicating with the refrigerant-passage outwardly bulging portions and the communication portions connecting these communication holes cooperate to form refrigerant passages in the intermediate plates of the upper and lower header tanks, the passages communicating with the interiors of the corresponding refrigerant-passage outwardly bulging portions and causing the refrigerant to flow in the left-right direction, wherein of all the communication portions which form the refrigerant passage of the intermediate plate communicating with the inflow-side refrigerant-passage outwardly bulging portion of the upper header tank, a plurality of narrow communication portions on the upstream side with respect to the flow direction of the refrigerant have a width, as measured in the front-rear direction, smaller than that of the remaining communication portions; and the relation 0.25≦A/B≦0.35 is satisfied, where A represents the number of the narrow communication portions, and B represents the total number of the communication holes which form the refrigerant passage and wherein the relation 0.6≦WA/WB≦0.8 is satisfied, where WA represents the width, as measured in the front-rear direction, of the narrow communication portions of all the communication portions which form the refrigerant passage of the intermediate plate communicating with the inflow-side refrigerant-passage outwardly bulging portion of the upper header tank, and WB represents the width of the remaining wide communication portions, as measured in the front-rear direction. 2. A heat exchanger according to claim 1, wherein the width WB of the wide communication portions falls within the range of 5 to 9 mm. 3. A heat exchanger comprising upper and lower header tanks disposed apart from each other, and a plurality of heat exchange tubes disposed in parallel between the two header tanks and having opposite end portions connected to the respective header tanks, wherein each of the head tanks is configured such that an outside plate, an inside plate, and an intermediate plate intervening between the outside and inside plates are brazed together in layers; each of the outside plates of the upper and lower header tanks has a plurality of outwardly bulging portions each extending in the left-right direction and having an opening closed by the intermediate plate; the inside plate has a plurality of tube insertion holes in the form of through-holes formed in a region corresponding to the outwardly bulging portions of the outside plate and spaced apart from one another along the left-right direction; the intermediate plate has a plurality of communication holes in the form of through-holes so as to allow the respective tube insertion holes of the inside plate to communicate with the interiors of the corresponding outwardly bulging portions of the outside plate; opposite end portions of the heat exchange tubes are inserted through the respective tube insertion holes of the inside plates of the two header tanks and are brazed to the inside plates; at least one outwardly bulging portion of each of the upper and lower header tanks serves a refrigerant-passage outwardly bulging portion within which refrigerant flows in the longitudinal direction; the refrigerant-passage outwardly bulging portion of the upper header tank serves as an inflow-side refrigerant-passage outwardly bulging portion whose one end portion communicates with a refrigerant inlet formed in the upper header tank; the communication holes of the intermediate plates communicating with the refrigerant-passage outwardly bulging portions of the upper and lower header tanks are connected by means of communication portions each formed between adjacent communication holes of the intermediate plates; and the communication holes communicating with the refrigerant-passage outwardly bulging portions and the communication portions connecting these communication holes cooperate to form refrigerant passages in the intermediate plates of the upper and lower header tanks, the passages communicating with the interiors of the corresponding refrigerant-passage outwardly bulging portions and causing the refrigerant to flow in the left-right direction, wherein of all the communication portions which form the refrigerant passage of the intermediate plate communicating with the refrigerant-passage outwardly bulging portion of the lower header tank, a plurality of narrow communication portions on the downstream side with respect to the flow direction of the refrigerant have a width, as measured in the front-rear direction, smaller than that of the remaining communication portions; and the relation 0.25≦C/D≦0.35 is satisfied, where C represents the number of the narrow communication portions, and D represents the total number of the communication holes which form the refrigerant passage and wherein the relation 0.6≦WC/WD≦0.8 is satisfied, where WC represents the width, as measured in the front-rear direction, of the narrow communication portions of all the communication portions which form the refrigerant passage of the intermediate plate communicating with the refrigerant-passage outwardly bulging portion of the lower header tank, and WD represents the width of the remaining wide communication portions, as measured in the front-rear direction. 4. A heat exchanger according to claim 3, wherein the width WD of the wide communication portions falls within the range of 5 to 9 mm. 5. A heat exchanger according to claim 1 or 3, wherein the outside plate of the upper header tank has four outward bulging portions arranged apart from one another in the front-rear and left-right directions, and the outside plate of the lower header tank has two outward bulging portions arranged apart from each other in the front-rear direction such that each outward bulging portion faces corresponding two outward bulging portions of the upper header tank which are located adjacent to each other in the left-right direction; a plurality of tube insertion holes are formed in each of front and rear portions of the inside plates of the two header tanks, and a plurality of communication holes are formed in each of front and rear portions of the intermediate plates of the two header tanks; two pairs each including front and rear outwardly bulging portions are arranged on the upper header tank in the left-right direction, wherein the outwardly bulging portions of one of the pairs serve as the refrigerant-passage outwardly bulging portions, one of the two refrigerant-passage outwardly bulging portions serves as the inflow-side refrigerant-passage outwardly bulging portion, the other refrigerant-passage outwardly bulging portion serves as an outflow-side refrigerant-passage outwardly bulging portion whose one end communicates with a refrigerant outlet formed in the upper header tank, and the communication holes of the intermediate plate communicating with one of the two outwardly bulging portions of the other pair are connected to the communication holes of the intermediate plate communicating with the other outwardly bulging portion of the other pair by refrigerant-turning communication portions formed in the intermediate plate, whereby communication is established between the two outwardly bulging portions of the other pair; and the two outwardly bulging portions of the lower header tank each serves as a refrigerant-passage outwardly bulging portion.
Suzuki, Hiroto; Arai, Tatsunori, Heat exchanger having a partition member for use in a vehicular air conditioning apparatus, and a vehicular air conditioning apparatus including the heat exchanger.
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