JP5034983B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger suitably used as, for example, a heater core incorporated in a car air conditioner of a vehicle.

  In this specification, the term “aluminum” includes aluminum alloys in addition to pure aluminum.

  As a heater core for a car air conditioner that heats a vehicle interior using engine coolant that has become high in temperature, a pair of header tanks that are spaced apart from each other and a width direction between the two header tanks are in the direction of ventilation. Corrugated fins arranged between a plurality of flat heat exchange pipes arranged at intervals in the length direction of the header tank and having both ends connected to both header tanks, and adjacent heat exchange pipes The heat exchanger provided with is widely used.

  As a kind of header tank used in the heat exchanger described above, it is constituted by a cylindrical tank body having at least one end opened, and a cap that is fitted over the opening end of the tank body and closes the opening of the tank body. A tank main body having a rectangular tank top wall and a pair of long side walls projecting toward the heat exchange pipe connected to a pair of parallel long sides of the tank top wall; A rectangular tube connection wall having the same length as the member and straddling the distal ends of both long side walls of the first component member, and a first component member connected to a pair of long side portions parallel to each other of the tube connection wall And a second component member having a pair of long side walls brazed to the first component member along the outer surface of the end portion on the side of the heat exchange pipe on both long side walls of the cap. It is provided on the peripheral edge of the top wall. A cap peripheral wall along the outer peripheral surface of the opening end of the main body, the cap peripheral wall of the cap being along the outer surface of the first component member of the tank main body and brazed to the first component member; 2. Description of the Related Art It is known that a second portion is brazed to a second component member along the outer surface of the component member. In this header tank, normally, the first and second constituent members of the tank body are formed of an aluminum brazing sheet having a brazing filler metal layer on the outer surface, and the cap is formed of an aluminum bare material.

  However, since the cap of such a header tank is usually press-molded, as shown in FIG. 7, along the outer surface of the first component member (42) on the cap peripheral wall (41) of the cap (40). A first part (41a) brazed to the first component (42) and a second part (41b) brazed to the second component (43) along the outer surface of the second component (43) It is unavoidable that a roundness (44) is formed on the inner surface of the boundary portion. When such roundness (44) is formed, the distal end surface of the long side wall (43a) of the second component member (43) and the outer surface of the long side wall (42a) of the first component member (42) form a right angle. A gap (45) is generated between the long side walls (42a) (43a) of the first component member (42) and the second component member (43) and the cap peripheral wall (41) of the cap (40), Brazing failure occurs. Here, the first and second constituent members (42) and (43) of the tank body are formed of an aluminum brazing sheet having a brazing filler metal layer on the outer surface, and the cap (40) is formed of an aluminum bare material. The end surfaces of the long side walls (42a) and (43a) of the first and second components (42) and (43) are not brazed to the inner surface of the top wall of the cap (40). Between the end surfaces of the long side walls (42a) and (43a) of the first and second components (42) and (43) and the inner surface of the cap top wall of the cap (40) and the gap (45). There is a problem of leaking outside.

  In order to solve such a problem, the first constituent member is formed by inclining the tip end surface of the end portion fitted into the cap on the long side wall of the second constituent member toward the pipe connecting wall toward the outside. A heat exchanger has been proposed in which the gap between the long side wall and the cap peripheral wall of the cap is reduced (see Patent Document 1).

However, since the cap is a press-molded product, the roundness (44) varies in size, and like the heat exchanger described in Patent Document 1, the front end surface of the long side wall of the second component member is Even if it is inclined outward toward the pipe connecting wall, the gap cannot be completely eliminated, and the occurrence of leakage cannot be completely prevented.
Japanese Patent Laid-Open No. 2001-215095

  An object of the present invention is to provide a heat exchanger that solves the above-described problems and can completely prevent leakage from occurring between the first and second components of the tank body of the header tank and the cap. .

  In order to achieve the above object, the present invention comprises the following aspects.

1) A pair of header tanks arranged at a distance from each other, and between the header tanks, the header tanks are arranged at intervals in the length direction of the header tank so that the width direction faces the ventilation direction, and both end portions are A plurality of heat exchange pipes connected to both header tanks, and the header tank is fitted with a cylindrical tank body having at least one end opened, and an opening end portion of the tank body to cover the opening of the tank body. A tank body having a rectangular tank top wall and a pair of long side walls projecting toward the heat exchange pipe connected to a pair of parallel long sides of the tank top wall. 1 component member, a rectangular tube connection wall having the same length as the first component member and straddling the leading ends of both long side walls of the first component member, and a pair of long sides parallel to each other of the tube connection wall Both long sides of the first component A second component member having a pair of long side walls brazed to the first component member along the outer surface of the heat exchange tube side end of the cap, wherein the cap has a cap top wall and a peripheral edge of the cap top wall A cap peripheral wall provided along the outer peripheral surface of the first end of the tank body and brazed to the first constituent member. In a heat exchanger comprising one part and a second part brazed to the second component member along the outer surface of the second component member,
Leakage-preventing projecting pieces projecting outward in the length direction on the opening side end portions of both long side walls of the first constituent member of the tank main body straddle the first portion and the second portion of the cap peripheral wall of the cap. A through hole into which the leakage preventing protrusion is inserted is formed on the cap top wall of the cap, and the leakage preventing protrusion is brazed to the cap top wall with the leakage preventing protrusion inserted into the through hole. Heat exchanger.

  According to the heat exchanger of 1) above, the leakage prevention projecting pieces projecting outward in the length direction are respectively provided on the opening side end portions of the long side walls of the first component of the tank body. A state in which the through hole into which the leakage preventing protrusion is inserted is formed in the cap top wall of the cap, and the leakage preventing protrusion is inserted into the through hole. Since the front end surface of the long side wall of the second component member is perpendicular to the outer surface of both long side walls of the first component member, and the first inner surface of the cap peripheral wall of the cap is brazed to the cap top wall of the cap. Even if a gap is generated between the long side wall of the first component member and the second component member and the cap peripheral wall of the cap due to the roundness formed at the boundary between the portion and the second portion, the inside of the header tank Fluid is the first and second components Can lead to the gap is prevented through between the end surface and the cap top wall inner surface of the cap of the long side wall of the. Therefore, it is possible to completely prevent the fluid from leaking from the header tank.

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the heat exchanger according to the present invention is applied to a heater core of a car air conditioner.

  In the description of the heater core with reference to FIGS. 1 to 6, the top, bottom, left and right in FIG. 1 are assumed to be top and bottom, and left and right, and the back side of FIG. Let's call it after.

  FIG. 1 shows the overall structure of a heater core for a car air conditioner to which a heat exchanger according to the present invention is applied, and FIGS.

  In FIG. 1, the heater core (1) has an aluminum upper header tank (2) and a lower header tank (3) which are spaced apart in the vertical direction and are long in the horizontal direction, and both upper and lower header tanks (2) (3 ), A plurality of flat aluminum heat exchange tubes with the width direction facing in the front-rear direction and spaced apart in the left-right direction, with both upper and lower ends connected to the upper and lower header tanks (2) (3). (4) and an aluminum corrugated fin (5) brazed to the heat exchange pipe (4) between the adjacent heat exchange pipes (4) and outside the heat exchange pipes (4) on the left and right ends And an aluminum side plate that is disposed outside the corrugated fins (5) at both ends and brazed to the corrugated fins (5), and whose upper and lower ends are brazed to the upper and lower header tanks (2) (3) ( 6) (7) and an outlet pipe (see figure) at the right end of the upper header tank (2). Approximately) is an inlet pipe (not shown) are connected to the right end portion of the lower header tank (3).

  As shown in FIGS. 2 to 5, the upper header tank (2) is fitted to the tank body (10) whose right end is open and whose left end is closed, and the right end (open end) of the tank body (10). And a cap (11) that covers and closes the opening of the tank body (10). The tank body (10) is connected to a pair of parallel long sides of the rectangular tank top wall (13) and the tank top wall (13) and protrudes downward (to the heat exchange pipe (4) side) 1 A first component member (12) having a pair of long side walls (14) and a short side wall (15) projecting downwardly connected to the short side of the left end of the tank top wall (13); The rectangular pipe connection wall (17) and the pipe connection wall (17) are parallel to each other and have the same length as 12) and straddle the tips of both long side walls (14) of the first component (12). Connected to the long side of the pair and along the outer surface of the lower end (the end of the heat exchange pipe (4) side) of the long side walls (14) of the first component (12), the wax is connected to the long side walls (14). A pair of long side walls (18) and a short side portion at the left end of the pipe connection wall (17) and short along the outer surface of the lower end portion of the short side wall (15) of the first component member (12) And a second component (16) having a short side wall (19) brazed to the side wall (15). The first and second components (12) and (16) are each formed by bending a metal base plate made of an aluminum brazing sheet having a brazing material layer on one side so that the brazing material layer comes to the outer surface.

  On the lower part of the right end (opening end) of the long side walls (14) of the first component (12) of the tank body (10), there are leakage prevention protrusions (21) protruding rightward. It is integrally formed. The upper edge of the leakage preventing protrusion (21) is located above the upper edge of the long side wall (18) of the second component (16), and the lower edge is the length of the first component (12). It is connected to the lower edge of the side wall (14) in a straight line. Therefore, the leakage prevention protrusion (21) is centered on the upper edge (tip edge) of both long side walls (18) of the second component (12), and above (the tank top wall (13) side). To the lower side (tube connection wall (17) side). In addition, a mating portion (22) superimposed on the inner surface of the long side wall (14) is integrally formed at both front and rear end portions of the short side wall (15) of the first component member (12). Is brazed to the inner surface of the long side wall (14).

  The pipe connecting wall (17) of the second component member (16) of the tank body (10) is formed with a plurality of long pipe insertion holes (23) in the front-rear direction at intervals in the left-right direction. The upper end of (4) is brazed to the pipe connection wall (17) in a state where it is inserted into the pipe insertion hole (23). Further, two through holes (24) are formed in the pipe connecting wall (17) on the right side of the pipe insertion hole (23) at the right end with a space in the front-rear direction. The upper projecting piece (25) formed at the upper end of the right side plate (6) is brazed to the second component member (16) in a state where it is inserted. Two lower folded portions (26) are formed on the short side wall (19) of the second component member (16) at intervals in the front-rear direction, and the upper end portion of the left side plate (7) is the short side wall (19 ) And the lower folded portion (26) and is brazed to the second component member (16).

  The cap (11) of the upper header tank (2) is provided on the peripheral edge of the cap top wall (27) and the top wall (27) of the cap, and the peripheral wall of the cap (28) along the outer peripheral surface of the right end of the tank body (10). And a metal base plate made of an aluminum brazing sheet having a brazing material layer on at least one side thereof is pressed so that the brazing material layer comes to the outer surface and / or the inner surface. The cap peripheral wall (28) of the cap (11) has a first portion (28a) brazed to the first component member (12) along the outer surface of the first component member (12) of the tank body (10). And a second portion (28b) brazed to the second component member (16) along the outer surface of the second component member (16), and a first portion (28a) on the inner surface of the cap peripheral wall (28). A round portion (31) is formed at the boundary portion between the first portion and the second portion (28b) (see FIG. 6). Through holes (29) that are long in the vertical direction are formed in the lower portions of the front and rear ends of the cap top wall (27) of the cap (11). The leakage preventing protrusion (21) of the first component (12) of the tank body (10) is brazed to the cap top wall (27) in a state of being inserted into the through hole (29). Here, the leakage prevention protrusion (21) is centered on the upper edge (tip edge) of both long side walls (18) of the second component (12) and above (the tank top wall (13) side). ) To the lower side (the pipe connection wall (17) side), the leakage preventing protrusion (21) is connected to the first part (28a) and the second part of the cap peripheral wall (28) of the cap (11). It is formed so as to straddle the portion (28b).

  Long vertical strips (32) protruding leftward are formed on the inner side in the front-rear direction than the through holes (29) at both front and rear ends of the cap top wall (27) of the cap (11). The right end of the long side wall (14) of the first component member (12) of the tank body (10) is fitted between the ridge (32) and the cap peripheral wall (28). Furthermore, a circular fluid passage hole (33) is formed in the cap top wall (27) in a penetrating manner, so that a portion around the fluid passage hole (33) on the outer surface of the cap top wall (27) is located to the right. A protruding cylindrical flange (34) is integrally formed over the entire circumference. The flange (34) is brazed with the end portion of the outlet pipe inserted into the flange (34).

  The lower header tank (3) is obtained by turning the upper header tank (2) upside down, and the same components and the same parts are denoted by the same reference numerals.

  In the heater core (1), as shown in FIG. 6, the front end surface of the long side wall (18) of the second component member (16) is perpendicular to the outer surfaces of both long side walls (14) of the first component member (12). In addition, the roundness (31) is formed at the boundary between the first portion (28a) and the second portion (28b) on the inner surface of the cap peripheral wall (28) of the cap (11), so that the first component ( 12) and even if there is a gap (35) between the long side walls (14), (18) of the second component (16) and the cap peripheral wall (28) of the cap (11), Due to the action of (21), the fluid in the header tank (2) (3) flows between the end surfaces of the first and second components (12), (16) and the inner surface of the cap top wall (27) of the cap (11). Passing through the gap (35) is prevented. Therefore, it is possible to completely prevent the fluid from leaking from the header tanks (2) and (3).

  In the above embodiment, the heat exchanger according to the present invention is applied to a heater core for a car air conditioner. However, the present invention is not limited to this, and can be applied to a heat exchanger for other uses, for example, an intercooler. . In the above embodiment, the header tank is composed of a tank body having one end opened and a cap fitted on the opening end of the tank body. However, the present invention is not limited to this, and a tank having both ends opened. It may consist of a main body and a cap fitted on both opening ends of the tank main body.

It is a front view which shows the whole structure of the heater core for car air conditioners to which the heat exchanger by this invention is applied. It is the AA line expanded sectional view which abbreviate | omitted a part of FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is CC sectional view taken on the line of FIG. It is the disassembled perspective view which abbreviate | omitted one part which shows an upper header tank. It is a figure which expands and shows the principal part of FIG. It is a figure equivalent to FIG. 6 which shows the problem of the header tank of the conventional heater core.

Explanation of symbols

(1): Heater core (heat exchanger)
(2) (3): Header tank
(4): Heat exchange pipe
(10): Tank body
(11): Cap
(12): First component
(13): Tank top wall
(14): Long side wall
(16): Second component
(17): Pipe connection wall
(18): Long sidewall
(21): Leakage prevention protrusion
(27): Cap top wall
(28): Cap wall
(28a): 1st part
(28b): Second part
(29): Through hole

Claims (1)

A pair of header tanks arranged at a distance from each other and between the header tanks, the header tank is arranged at intervals in the length direction of the header tank so that the width direction faces the ventilation direction, and both headers are at both ends. A plurality of heat exchange pipes connected to the tank, and the header tank is fitted into a cylindrical tank body having at least one end opened, and an opening end of the tank body to close the opening of the tank body. And a tank body having a rectangular tank top wall and a pair of long side walls projecting toward the heat exchange pipe connected to a pair of parallel long sides of the tank top wall. A rectangular pipe connecting wall having the same length as the first constituent member and straddling the distal ends of both long side walls of the first constituent member, and a pair of long sides parallel to each other of the pipe connecting wall Continuous and long side walls of the first component And a second component member having a pair of long side walls brazed to the first component member along the outer surface of the heat exchange tube side end, and the cap includes a cap top wall and a peripheral edge of the cap top wall A cap peripheral wall provided along the outer peripheral surface of the first end of the tank body and brazed to the first constituent member. In a heat exchanger comprising one part and a second part brazed to the second component member along the outer surface of the second component member,
Leakage-preventing projecting pieces projecting outward in the length direction on the opening side end portions of both long side walls of the first constituent member of the tank main body straddle the first portion and the second portion of the cap peripheral wall of the cap. A through hole into which the leakage preventing protrusion is inserted is formed on the cap top wall of the cap, and the leakage preventing protrusion is brazed to the cap top wall with the leakage preventing protrusion inserted into the through hole. Heat exchanger.

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