JP2011127779A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger which prevents poor brazing from occurring between the first and second plates of a refrigerant charging/discharging member and fitting projection parts of a connector for the heat exchanger. <P>SOLUTION: An intermediate plate 23 is disposed between the first plate 21 and the second plate 22 of the refrigerant charging/discharging member 5 of an evaporator. In the intermediate plate 23, cutouts 35 and 38, by which outward expansion parts 28 and 32 for an inflow passage of the first and second plates 21 and 22 are communicated with each other and outward expansion parts 29 and 34 for an outflow passage of the first and second plates 21 and 22 are communicated with each other, are formed so that the inflow passage 24 and the outflow passage 25 for the refrigerant charging/discharging member 5 cross each other in the view from the layering direction of the all plates 21, 22, and 23. The both side ends of the cutouts 35 and 38 forming an inlet 24 side end of the inflow passage 24 and an outlet 25a side end of the outflow passage 25 in the intermediate plate 23 enter clearances 51 and 52 between rounds 46-49 of the first and second plates 21 and 22 and the fitting projection parts 44 and 45 to be brought close to the outer circumferential faces of the fitting projection parts 44 and 45. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat exchanger suitably used as an evaporator of a car air conditioner that is a refrigeration cycle mounted on an automobile, for example.

  As an evaporator of a car air conditioner, a first header tank and a second header tank that are spaced apart in the vertical direction, and a distance between the header tanks in the length direction of both header tanks, and both upper and lower ends are A plurality of heat exchange tubes connected to the upper and lower header tanks, fins disposed between adjacent heat exchange tubes, a refrigerant inlet / outlet member brazed to one end of the first header tank, and a refrigerant inlet / outlet member And an auxiliary fitting member as a heat exchanger connection device brazed to the upper header tank, the refrigerant inlet header portion and the refrigerant outlet header portion are arranged in the ventilation direction, and one end portion of the upper and lower header tanks The refrigerant inlet / outlet member is provided at the end of the brazed side, and the refrigerant inlet / outlet members at the refrigerant inlet header portion and the refrigerant outlet header portion are brazed. A refrigerant inlet and a refrigerant outlet are formed at the end on the side, and the refrigerant inlet header part and the refrigerant outlet header part are composed of an intermediate header part provided in at least one of the heat exchange pipe and the upper and lower header tanks. The refrigerant inlet / outlet member is made up of a laminated first plate and second plate, and one end communicates with the refrigerant inlet of the refrigerant inlet header portion and the other end between the two plates of the refrigerant inlet / outlet member. An inflow passage serving as an inlet opening at one side edge of the refrigerant inlet / outlet member, and one end leading to the refrigerant outlet of the refrigerant outlet header portion and the other end opening to the side edge portion where the inlet passage in the refrigerant inlet / outlet member is opened The outflow path that is the outlet is formed by expanding the first and second plates outwardly in a semi-cylindrical shape, and the inlet side end of the inflow path and the outlet of the outflow path The end portion is cylindrical, and the auxiliary fitting member has a refrigerant passage having both ends open, and around the one end opening of each refrigerant passage, in the inlet side end portion of the inlet / outlet passage of the refrigerant inlet / outlet member and the outlet of the outlet passage Cylindrical fitting projections fitted in the side ends are provided, and the fitting projections of the auxiliary fitting member are fitted into the inlet side end of the inlet / outlet passage of the refrigerant inlet / outlet member and into the end of the outlet passage. An evaporator that is brazed to first and second plates of an input / output member is known (see Patent Document 1).

  The first and second plates of the refrigerant inlet / outlet member in the evaporator described in Patent Document 1 are usually manufactured by pressing a metal base plate using two molds. In this case, Problems may arise. That is, when the first and second plates are manufactured by the above-described method, as shown in FIG. 7, the bulging portion (63) forming the inflow passage (62) in the first and second plates (60) (61) is formed. ) (64), the inner peripheral surface of the inlet side end portion, the inner peripheral surface of the outlet side end portion of the bulging portion (not shown) forming the outflow passage (not shown), and the first and second plates (60). ) (61) It is inevitable that roundness (63a) and (64a) occur at the connecting portion with the inner surface of the non-bulged portion. Therefore, the first and second plates (60) and (61) are combined, and the inlet and outlet ends of the inlet and outlet passages (62) and the outlet and outlet portions of the first and second plates (60 and 61) are aligned. When the fitting convex part (65) of the auxiliary fitting member is inserted, it is between the first and second plates (60) (61) and the outer peripheral surface of the fitting convex part (65) of the auxiliary fitting member. A relatively large gap (66) is generated, and the gap (66) is not completely filled with the brazing material (not shown), which may cause a brazing failure.

JP 2003-307399 A

  An object of the present invention is to solve the above-mentioned problem and to perform heat exchange that can suppress the occurrence of poor brazing between the first and second plates of the refrigerant inlet / outlet member and the fitting convex portion of the connection device for the heat exchanger. Is to provide a vessel.

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

1) A refrigerant inlet header portion and a refrigerant outlet header portion arranged side by side in the ventilation direction, a refrigerant circulation path that passes through both header portions, a stacked first plate and second plate, and a refrigerant inlet header portion And a refrigerant inlet / outlet member joined across the refrigerant outlet header, and a heat exchanger connecting device having a refrigerant passage open at both ends and joined to the refrigerant inlet / outlet member. A refrigerant inlet is formed at one end and a refrigerant outlet is formed at the same end as the refrigerant inlet in the refrigerant outlet header portion, and the refrigerant flowing into the refrigerant inlet header portion from the refrigerant inlet passes through the refrigerant circulation path and passes through the refrigerant outlet header portion. , And one end leads to the refrigerant inlet of the refrigerant inlet header part between the two plates of the refrigerant inlet / outlet member and the other end of the refrigerant inlet / outlet. An inflow passage serving as an inlet opening at one side edge of the material, and an outlet opening at one end leading to the refrigerant outlet of the refrigerant outlet header portion and the other end at the side edge opening of the inflow passage in the refrigerant inlet / outlet member The outflow path is formed by bulging the first plate and the second plate outward, the inlet side end of the inflow path and the outlet side end of the outflow path are cylindrical, and heat exchange Around the opening of one end of each refrigerant passage of the connection device for the vessel, a cylindrical fitting convex portion that is fitted in the inlet side end portion of the inlet / outlet passage of the refrigerant inlet / outlet member and the outlet side end portion of the outlet passage is provided. A heat exchanger in which the fitting convex portion of the connecting member is fitted in the inlet side end portion of the refrigerant inlet / outlet member and in the end portion of the outlet passage and brazed to the refrigerant inlet / outlet member,
The inner peripheral surface of the inlet side end portion of the inflow passage outward bulging portion, the inner peripheral surface of the outlet side end portion of the outflow passage outer bulging portion, and the outer sides thereof in the first plate of the refrigerant inlet / outlet member Roundness is present in each of the connecting portions with the inner surfaces of the non-bulged portions on both sides of the bulging portion, and the inner peripheral surface of the inlet side end portion of the outer bulging portion for the inflow passage in the second plate and for the outflow passage A roundness exists at the connecting portion between the inner peripheral surface of the outlet side end portion of the outward bulging portion and the inner surface of the non-bulging portion on both sides of the outer bulging portion, and the first and second plates A gap is formed between the roundness and the fitting convex part of the connection device for heat exchanger,
The first and second plates are fitted between the first plate and the second plate on both sides of the portion where the fitting convex portion of the connection device for the heat exchanger is fitted in the inlet and outlet passages of the refrigerant inlet / outlet member. A brazing auxiliary plate for improving the brazing performance with the joint convex portion is arranged, and the edge portion on the fitting convex portion side of the connecting device for heat exchanger in the brazing auxiliary plate is the above-mentioned of the first and second plates. The first and second plates of the refrigerant inlet / outlet member and the connection device for the heat exchanger are inserted into the gap between the roundness and the fitting projection of the connection device for the heat exchanger and close to the outer peripheral surface of the fitting projection. A heat exchanger in which a fitting convex part and a brazing auxiliary plate are brazed.

  2) The heat exchange according to 1) above, wherein the distance between the fitting convex portion side edge of the heat exchanger connecting device in the brazing auxiliary plate and the outer peripheral surface of the fitting convex portion is 0.5 mm or less. vessel.

  3) The heat exchanger according to 1) or 2) above, wherein the edge on the fitting convex portion side of the connecting device for heat exchanger in the brazing auxiliary plate is deformed so as to expand in the thickness direction of the brazing auxiliary plate .

  4) The gap between the roundness of the first and second plates of the refrigerant inlet / outlet member, the fitting convex portion of the connection device for the heat exchanger, and the edge portion of the brazing auxiliary plate is filled with the brazing material. The heat exchanger according to any one of 1) to 3) above.

  5) An intermediate plate is interposed between the first plate and the second plate of the refrigerant inlet / outlet member, and the intermediate plate is brazed to the first plate and the second plate, and the inflow passage of the refrigerant inlet / outlet member is connected to the intermediate plate. And the outflow passages of the first and second plates, and the outflow passage outward bulges of the first and second plates, so that the outflow passage and the outflow passage intersect each other when viewed from the stacking direction of all the plates. A notch and a through-hole are formed through each other, and the intermediate plate also serves as a brazing auxiliary plate, and a notch that forms an end on the inlet side of the inflow passage and an end on the outlet side of the outflow passage in the intermediate plate Both side edge portions enter into the gap between the roundness of the first and second plates of the refrigerant inlet / outlet member and the fitting convex portion of the connecting device for heat exchanger, and the fitting convexity of the connecting device for heat exchanger A heat exchanger according to any one of the above 1) to 4) in close proximity to the outer peripheral surface of the.

  According to the heat exchangers 1) to 5) described above, the first plate and the second plate are disposed on both sides of the portion where the fitting convex portion of the heat exchanger connecting device is fitted in the inflow path and the outflow path of the refrigerant inlet / outlet member. A brazing auxiliary plate for improving brazing between the first and second plates and the fitting convex portion is disposed between the plates, and the fitting convex portion of the connecting device for the heat exchanger in the brazing auxiliary plate The side edge portion enters the gap between the roundness of the first and second plates and the fitting convex portion of the heat exchanger connecting device and is close to the outer peripheral surface of the fitting convex portion, and the refrigerant inlet / outlet member Since the fitting projections of the connecting device for heat exchanger and the brazing auxiliary plate are brazed, the roundness of the first and second plates of the refrigerant inlet / outlet member and the heat exchanger The above clearance between the fitting protrusions of the connecting device By the function of the rate, it becomes smaller than the heat exchanger described in Patent Document 1. Therefore, the gap is easily filled with the brazing material, and the occurrence of brazing defects can be suppressed.

  According to the heat exchangers 2) and 3), the fitting convex portions of the connection member for the heat exchanger are inserted into the inlet side end portion of the inflow passage and the outlet side end portion of the outflow passage in the first and second plates. At this time, the gap generated between the roundness of the first and second plates of the refrigerant inlet / outlet member and the fitting convex portion of the connection member for the heat exchanger can be further reduced by the action of the edge of the auxiliary plate. . Therefore, the gap is more easily filled with the brazing material, and the occurrence of brazing defects can be effectively suppressed.

1 is a partially cutaway perspective view showing an overall configuration of an evaporator to which a heat exchanger according to the present invention is applied. FIG. 2 is a partially cut-away vertical sectional view seen from the right side, cut at a portion of a first plate of a refrigerant inlet / outlet member in the evaporator of FIG. 1. It is an AA line expanded sectional view of FIG. It is a disassembled perspective view which shows the refrigerant | coolant inlet / outlet member and expansion valve attachment member of the evaporator of FIG. FIG. 4 is a partially enlarged view of FIG. 3. It is a figure equivalent to FIG. 5 which shows the modification of the intermediate | middle plate of a refrigerant | coolant in / out member. FIG. 6 is a view corresponding to FIG. 5 illustrating problems of the evaporator described in Patent Document 1.

  Embodiments of the present invention will be described below with reference to the drawings. Throughout the drawings, the same parts and the same parts are denoted by the same reference numerals, and redundant description is omitted.

  In the embodiment described below, the heat exchanger according to the present invention is applied to an evaporator of a car air conditioner using a chlorofluorocarbon refrigerant, and the connection device for the heat exchanger is an expansion valve mounting member.

  In the following description, the term “aluminum” includes aluminum alloys in addition to pure aluminum. Further, in the following description, the downstream side of the air flowing in the ventilation gap between adjacent heat exchange tubes (the direction indicated by the arrow X in FIG. 1, the right side in FIG. 2) is referred to as the front, and the opposite side is referred to as the rear. The up and down, left and right (up and down, left and right in FIG. 1) when viewing the front from the rear are referred to as up and down and left and right.

  FIG. 1 shows the overall configuration of the evaporator, and FIGS. 2 to 5 show the configuration of the main part of the evaporator.

  1 and 2, an evaporator (1) used in a car air conditioner using a chlorofluorocarbon refrigerant has an aluminum first header tank (2) and an aluminum second header tank arranged at intervals in the vertical direction. (3), a heat exchange core (4) provided between the header tanks (2) and (3), and an aluminum refrigerant inlet / outlet member (5) joined to the right end of the first header tank (2) And an aluminum expansion valve mounting member (6) joined to the refrigerant inlet / outlet member (5).

  The first header tank (2) is located on the front side (downstream side in the ventilation direction) and extends in the left-right direction, and on the rear side (upstream side in the ventilation direction) and extends in the left-right direction. And a refrigerant outlet header portion (8) integrated with the refrigerant inlet header portion (7). A refrigerant inlet (9) is provided at the right end of the refrigerant inlet header (7), and a refrigerant outlet (11) is provided at the right end of the refrigerant outlet header (8).

  The second header tank (3) is located on the front side and extends in the left-right direction, and is integrated with the first intermediate header portion (12) located on the rear side and extending in the left-right direction. And a second intermediate header portion (13). The first intermediate header portion (12) and the second intermediate header portion (13) are formed by dividing the inside of the second header tank (3) into two front and rear spaces by a partition member (14). The inside of the first intermediate header portion (12) and the inside of the second intermediate header portion (13) are communicated with the partition member (14) through a plurality of communication holes (15) formed at intervals in the left-right direction. It has been.

  The heat exchange core section (4) is composed of a plurality of heat exchange pipe groups (17) composed of a plurality of heat exchange pipes (16) arranged in parallel at intervals in the left-right direction. Are arranged in two rows, the ventilation gap between adjacent heat exchange tubes (16) of each heat exchange tube group (17), and the heat exchange tubes (16) at the left and right ends of each heat exchange tube group (17). Corrugated fins (18) are arranged on the outside and brazed to the heat exchange pipe (16), and aluminum side plates (19) are arranged on the outside of the corrugated fins (18) on both the left and right ends, respectively. It is configured by brazing to 18). The upper and lower ends of the heat exchange pipe (16) of the front side heat exchange pipe group (17) are connected to the refrigerant inlet header part (7) and the first intermediate header part (12), and the heat of the rear side heat exchange pipe group (17). The upper and lower ends of the exchange pipe (16) are connected to the refrigerant outlet header part (8) and the second intermediate header part (13). Then, the refrigerant inlet header portion (7) and the refrigerant outlet header portion (7) are formed by the heat exchange pipe (16) of the front and rear heat exchange tube group (17) and the first and second intermediate header portions (12) and (13). 8) A refrigerant circulation path is formed through. The heat exchange tube (16) has a flat shape having a plurality of refrigerant passages arranged in the width direction and arranged in the width direction in the front-rear direction. The corrugated fin (18) is formed in a wave shape using an aluminum brazing sheet having a brazing filler metal layer on both sides, and is shared by both the front and rear heat exchange tubes (16) constituting the front and rear heat exchange tube group (17). Has been.

  As shown in FIGS. 2 to 5, the refrigerant inlet / outlet member (5) has a vertical aluminum first plate (21) located on the left side (first header tank (2) side) and a vertical shape located on the right side. By laminating and brazing a second plate (22) made of aluminum brazing sheet and a vertical aluminum intermediate plate (23) located between the first plate (21) and the second plate (22) It is formed and joined across the right end of the refrigerant inlet header (7) and the refrigerant outlet header (8) of the first header tank (2). The refrigerant inlet / outlet member (5) has one end leading to the refrigerant inlet (9) of the refrigerant inlet header (7) and the other end opened to the rear edge of the refrigerant inlet / outlet member (5), and an inflow path (24), One end leads to the refrigerant outlet (11) of the refrigerant outlet header (8) and the other end is the rear edge of the refrigerant inlet / outlet member (5) (the side edge where the inflow passage (24) in the refrigerant inlet / outlet member (5) is opened) ) And an outflow passage (25) opened. The opening to the rear edge of the refrigerant inlet / outlet member (5) in the inflow passage (24) is called an inlet (24a), and the opening to the rear edge of the refrigerant inlet / outlet member (5) in the outlet passage (25) is an outlet (25a ).

  A first communication port (26) communicating with the refrigerant inlet (9) of the refrigerant inlet header (7) and the refrigerant outlet (11) of the refrigerant outlet header (8) are connected to the first plate (21) of the refrigerant inlet / outlet member (5). ) Leading to the second communication port (27), one end is located away from the first and second communication ports (26) and (27), and the other end is opened to the rear edge of the first plate (21) A first semi-circular inflow channel first outward bulging portion (28), one end of which is located away from the first and second communication ports (26), (27) and the other end of the first plate (21) The first outer bulging portion (29) for the outflow passage having a semicircular cross section that opens above the other end opening of the first outer bulging portion (28) for the inflow passage at the rear edge, and the lower end portion Cross section in a position slightly apart from the second communication port (27) and having an upper end at a position slightly lower than the other end opening of the first outward bulging portion (28) for the inflow passage A semicircular vertical outflow channel second outward bulge (31) is formed Yes.

  The second plate (22) of the refrigerant inlet / outlet member (5) has one end at a position away from the first and second communication ports (26), (27) of the first plate (21) and the other end at the first plate. The second outside for the inflow passage having a semicircular cross section opened at the rear edge of the second plate (22) at the same height as the other end of the first outward bulge portion (28) for the inflow passage of (21) The side bulge portion (32) has one end at a position corresponding to the first communication port (26) of the first plate (21) and the other end connected to the second communication port (27) of the first plate (21) and the inflow. The third outward bulge portion (33) for the inflow passage having a semicircular cross section at a position away from the second outward bulge portion (32) for the road, and the second communication of the first plate (21) at one end Located at the position corresponding to the opening (27) and the other end opened at the rear edge of the second plate (22) at the same position as the first outward bulging portion (29) for the outflow passage of the first plate (21) A third semi-circular outflow section (34) for the outflow channel is formed To have.

  The first plate (21) and the second plate (22) of the refrigerant inlet / outlet member (5) are formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides using a die. is there.

  One end of the refrigerant inlet / outlet member (5) is connected to the rear edge of the intermediate plate (23) at the same position as the first outward bulging portion (28) for the inflow passage of the first plate (21). Open and let it pass through the inside of the first outward bulge portion (28) for the inflow passage of the first plate (21) and the inside of the second outward bulge portion (32) for the inflow passage of the second plate (22). The first notch (35), the inside of the first outward bulge portion (28) for the inflow passage of the first plate (21) and the third outward bulge portion (33 for the inflow passage of the second plate (22)) ) In the first through hole (36) to be passed through, the first communication port (26) of the first plate (21) and the third outward bulging portion (33) for the inflow passage of the second plate (22) The second through hole (37) through which one end is opened at the rear edge of the intermediate plate (23) at the same position as the first outward bulging portion (29) for the outflow passage of the first plate (21) And the third outward bulge for the outflow passage of the first plate (21) and the outflow passage for the outflow passage of the second plate (22). A second notch (38) that passes through the inside of the portion (34), a second communication port (27) of the first plate (21), and a third outward bulge portion for the outflow passage of the second plate (22) ( 34) a third through hole (39) that passes through the inside, and a third outside outlet (31) for the outflow passage of the first plate (21) and a third for the outflow passage of the second plate (22). A fourth through hole (41) is formed through the inside of the outward bulge portion (34). The intermediate plate (23) of the refrigerant inlet / outlet member (5) is formed by subjecting an aluminum brazing sheet having a brazing filler metal layer on both sides or a sheet made of an aluminum bare material to pressing using a mold. is there.

  The first outward bulging portion (28) for the inflow passage of the first plate (21) includes a vertical portion (28a) extending upward from a position slightly above the first communication port (26), and a vertical portion (28a). And a horizontal portion (28b) extending rearward and extending to the rear edge of the first plate (21). The first outward bulging portion (29) for the outflow passage of the first plate (21) is located above the horizontal portion (28b) of the first outward bulging portion (28) for the inflow passage. ) A portion extending horizontally forward from a position higher than the first outward bulging portion (28) for the inflow passage at the rear edge is inclined forward and obliquely downward. The front end portion of the outflow passage first outer bulge portion (29) is positioned at the center in the front-rear direction of the horizontal portion (28b) of the first inflow passage bulge portion (28). The upper end of the second outward bulging portion (31) for the outflow passage of the first plate (21) is slightly lower than the horizontal portion (28b) of the first outward bulging portion (28) for the inflow passage. In position.

  The second outward bulging portion (32) for the inflow passage of the second plate (22) is the same as the horizontal portion (28b) of the first outward bulging portion (28) for the inflow passage of the first plate (21). In the height position, it extends horizontally forward from the rear edge of the second plate (22), and its front end portion is located slightly rearward of the third outward bulging portion (34) for the outflow passage. The third outward bulging portion (33) for the inflow passage of the second plate (22) has a vertical shape extending upward from a position corresponding to the first communication port (26) of the first plate (21). The upper end portion of the third outward bulging portion (33) for the inflow passage is above the lower end of the vertical portion (28a) of the first outward bulging portion (28) for the inflow passage of the first plate (21). positioned. The third outward bulging portion (34) for the outflow passage of the second plate (22) extends upward from a position corresponding to the second communication port (27) of the first plate (21), and the second inflow passage second. A vertical portion (34a) extending upward from the outward bulge portion (32), and a horizontal portion (34b) extending rearwardly to the upper end of the vertical portion (34a) and reaching the rear edge of the first plate (21). ). The front edge of the upper part of the vertical part (34a) extends forward to increase the flow path area. The upper edge of the portion near the front end of the horizontal portion (34b) is inclined forward to match the upper edge of the portion of the first plate (21) near the front end of the first outward bulge portion (29) for the outflow passage. Inclined downward.

  The shape of the first cutout (35) of the intermediate plate (23) matches the shape of the second outward bulging portion (32) for the inflow passage as viewed from the right side. The first through hole (36) of the intermediate plate (23) has a lower end portion of the vertical portion (28a) of the first outward bulging portion (28) for the inflow passage of the first plate (21) and the second plate (22 ) Is in a position where the upper ends of the third outward bulging portion (33) for the inflow passage overlap each other when viewed from the right side. The second through hole (37) of the intermediate plate (23) is located at a position corresponding to the first communication port (26) of the first plate (21). And the part between the 1st through-hole (36) and the 2nd through-hole (37) in the intermediate | middle plate (23) is excised, and both through-holes (36) ( 37) is communicated. The shape of the first through hole (36), the second through hole (37), and the cutout part (42) is the same as that of the third outward bulge part (33) for the inflow passage of the second plate (22). It matches the shape seen from the above. The shape of the second notch (38) of the intermediate plate (23) matches the shape of the outflow channel first outward bulge portion (29) viewed from the right side. The third through hole (39) of the intermediate plate (23) is located at a position corresponding to the second communication port (27) of the first plate (21). The fourth through hole (41) of the intermediate plate (23) is the second outer bulge portion (31) for the outflow passage of the first plate (21) and the third outer side for the outflow passage of the second plate (22). The vertical part (34a) of the bulging part (34) is located at the overlapping position when viewed from the right side. And the part between the 3rd through-hole (39) and the 4th through-hole (41) in the intermediate | middle plate (23) is excised, and both through-holes (39) ( 41) is communicated.

  Accordingly, the first communication port (26) of the first plate (21) and the first outward bulging portion (28) for the inflow passage and the second outward bulging portion for the inflow passage of the second plate (22) ( 32) and the third outward bulge portion (33) for the inflow passage, the first notch (35), the first through hole (36), the second through hole (37) and the cut portion of the intermediate plate (23). (42) forms an inflow path (24) in the refrigerant inlet / outlet member (5), the second communication port (27) of the first plate (21), the first outer bulging portion (29) for the outflow path, and The second outward bulge portion (31) for the outflow passage, the third outward bulge portion (34) for the outflow passage of the second plate (22), and the second notch (38) of the intermediate plate (23) The third through hole (39), the fourth through hole (41), and the cut portion (43) form an outflow path (25) in the refrigerant inlet / outlet member (5), and the inflow path (24) and the outflow path (25) intersects the entire plate (21), (22), and (23) in the stacking direction, that is, from the left or right side without being communicated with the interior thereof. The inlet (24a) side end of the inflow passage (24) of the refrigerant inlet / outlet member (5) and the outlet (25a) side end of the outflow passage (25) are cylindrical.

  The expansion valve mounting member (6) is formed with a high-pressure refrigerant passage (6a) and a low-pressure refrigerant passage (6b) that extend in the front-rear direction and open at both front and rear sides, and are lined up and down so that the former is positioned below. Yes. Around the front end opening (opening on the refrigerant inlet / outlet member (5) side) of each refrigerant passage (6a) (6b) of the expansion valve mounting member (6), the inflow path (24) and the outflow path of the refrigerant inlet / outlet member (5) Cylindrical fitting projections (44) and (45) that fit into (25) are integrally formed. Then, the lower fitting convex portion is fitted into the inlet (24a) side end portion of the inflow passage (24), and the upper fitting convex portion is fitted into the outlet (25a) side end portion of the outflow passage (25). In this state, both fitting projections (44) (45) are brazed to the refrigerant inlet / outlet member (5).

  In the refrigerant inlet / outlet member (5) described above, the first plate (21) and the second plate (22) are formed by pressing an aluminum brazing sheet having a brazing filler metal layer on both sides. The inner peripheral surface of the inlet (24a) side end of the first inflow channel first outer bulging portion (28) in the first plate (21) and the outlet of the first outflow channel first outer bulging portion (29) ( 25a) Roundness (46) (47) is generated at the connecting portion between the inner peripheral surface of the side end portion and the inner surface (right side surface) of the non-bulged portion of the first plate (21), and the second plate (22 ) On the inner peripheral surface of the inlet (24a) side end of the second outward bulge portion (32) for the inflow passage, and the outlet (25a) side end portion of the third outer bulge portion (34) for the outflow passage Roundness (48) and (49) are generated at the connecting portion between the inner peripheral surface of the first plate and the inner surface (left side surface) of the non-bulged portion of the second plate (22). Therefore, the roundness (46) of the first plate (21) and the roundness (48) of the second plate (22) of the refrigerant inlet / outlet member (5) and the outer peripheral surface of the fitting convex portion (44) of the expansion valve mounting member (6) A gap (51) is formed between the first plate (21), the second plate (22), the second plate (22), and the expansion valve mounting member (6). (45) A gap (52) is formed between the outer peripheral surface and the outer peripheral surface. When the thickness of the first and second plates (21) and (22) is, for example, about 0.8 mm, the curvature radius of the roundness (46) (47) (48) (49) is 1.5 to 2.5 mm. It becomes.

  Here, the upper and lower side edges (53) (fitting protrusions) of the first cutout (35) of the intermediate plate (23) (the cutout forming the end portion on the inlet (24a) side of the inflow passage (24)) (44) side edge) between the roundness (46) (48) of the first and second plates (21) (22) and the fitting convex part (44) outer peripheral surface of the expansion valve mounting member (6). It enters the gap (51) between them and is close to the outer peripheral surface of the fitting projection (44). Also, the upper and lower side edges (54) (fitting protrusions (notches forming the end on the outlet (25a) side of the outlet channel (25)) of the second notch (38) of the intermediate plate (23). 45) side edge) is between the roundness (47) (49) of the first and second plates (21) (22) and the fitting convex part (45) outer peripheral surface of the expansion valve mounting member (6). In the gap (52) and close to the outer peripheral surface of the fitting projection (45). Upper and lower side edges (53) of the first notch (35) of the intermediate plate (23) and upper and lower side edges (54) of the second notch (38) and outer peripheries of the fitting protrusions (44) (45) It is preferable that the distance between each surface is 0.5 mm or less. The upper and lower side edges (53) (54) of the first and second cutouts (35) (38) enter the gap (51) (52), thereby reducing the gap (51) (52). As a result, the entire gaps (51) and (52) are filled with the brazing material (not shown), and the occurrence of brazing defects can be suppressed. Therefore, the intermediate plate (23) also serves as a brazing auxiliary plate that improves the brazing performance between the first and second plates (21), (22) and the fitting convex portions (44), (45).

The evaporator (1) constitutes a refrigeration cycle using a chlorofluorocarbon refrigerant together with a compressor and a condenser as a refrigerant cooler, and is mounted on a vehicle, for example, an automobile, as a car air conditioner. At this time, the expansion valve (not shown) is attached to the expansion valve mounting member (6) so that the low-pressure refrigerant discharge path is located above and the high-pressure refrigerant supply path is located below. During the cooling operation, the gas-liquid mixed phase two-phase refrigerant that has passed through the high-pressure refrigerant supply passages of the compressor, the condenser, and the expansion valve passes through the high-pressure refrigerant passage (6a) of the expansion valve mounting member (6). ) Enters the inflow path (24) from the rear edge inlet (24a), flows through the inflow path (24), and enters the refrigerant inlet (9) of the first header tank (2) from the first communication port (26). ) Through the refrigerant inlet header (7). The refrigerant that has entered the refrigerant inlet header (7) is divided into the heat exchange pipe (16) of the front heat exchange pipe group (17), the first intermediate header part (12) of the second header tank (3), the partition member ( 14) the communication hole (15), the second intermediate header section (13), the heat exchange pipe (16) of the rear heat exchange pipe group (17) and the refrigerant outlet header section (8) in sequence, The refrigerant enters the outflow path (25) of the refrigerant inlet / outlet member (5) from the second communication port (27) through the refrigerant outlet (11) of (8). The refrigerant that has entered the outflow passage (25) flows through the outflow passage (25), out of the outlet (25a) at the rear edge of the refrigerant inlet / outlet member (5), and flows through the low pressure refrigerant passage of the expansion valve mounting member (6). The refrigerant enters the low-pressure refrigerant discharge path of the expansion valve through (6b), and is sent to the compressor through the low-pressure refrigerant discharge path.
While the refrigerant flows through the heat exchange pipe (16), heat exchange is performed with air (see arrow X in FIG. 1) passing through the ventilation gap between the adjacent heat exchange pipes (16). And then leak.

  In the embodiment described above, the inlet (24a) side end of the inflow path (24) of the refrigerant inlet / outlet member (5) and the outlet (25a) side end of the outflow path (25) are cylindrical, and the expansion valve The fitting projections (44) and (45) of the mounting member (6) are cylindrical, but the present invention is not limited to this, and the inlet (24a) side of the inflow path (24) of the refrigerant inlet / outlet member (5) The cross-sectional shapes of the end, the outlet (25a) side end of the outflow passage (25), and the fitting convex portions (44) (45) of the expansion valve mounting member (6) are oval, oval, polygonal It can be changed as appropriate.

  FIG. 6 shows a modification of the intermediate plate.

  In FIG. 6, the upper and lower side edges (53) and (54) of the first and second cutouts (35) and (38) of the intermediate plate (23) are deformed so as to expand in the thickness direction of the intermediate plate (23), respectively. It has been made. Deformation parts are indicated by (53a) and (54a).

  In this case, the first and second plates (21), (22) of the refrigerant inlet / outlet member (5) are rounded (46), (48), (47), (49) and the fitting convex portion of the expansion valve mounting member (6) ( 44) (45) The gap (51) (52) between the outer peripheral surface is further reduced, and the gap (51) (52) is more reliably filled with the brazing material (not shown). The occurrence of defects can be effectively suppressed.

  In the heat exchanger according to the present invention, a plurality of flat hollow bodies formed by brazing peripheral edges with a pair of plate-shaped plates facing each other are arranged in parallel, and are arranged side by side in the front-rear direction. A refrigerant inlet header section and a refrigerant outlet header section, a refrigerant turn section disposed at a distance from both header sections, a plurality of refrigerant forward refrigerant circulation sections that communicate the refrigerant inlet header section and the refrigerant turn section, The refrigerant outlet header section and a plurality of refrigerant return-side refrigerant circulation sections that communicate with the refrigerant turn section are provided. A refrigerant inlet is formed at one end of the refrigerant inlet header section, and the same end as the refrigerant inlet in the refrigerant outlet header section A refrigerant outlet is formed in the refrigerant inlet header portion from the refrigerant inlet to the refrigerant turn portion through the refrigerant outlet side refrigerant circulation portion, where the flow direction is changed and the refrigerant return side refrigerant circulation portion is passed. Returning to the refrigerant outlet header section Te is also applicable to a so-called laminated evaporator that going on format to be sent out from the refrigerant outlet.

  The heat exchanger according to the present invention is suitably used for an evaporator of a refrigeration cycle constituting a car air conditioner.

(1): Evaporator (heat exchanger)
(5): Refrigerant input / output member
(6): Expansion valve mounting member (connector for heat exchanger)
(6a) (6b): Refrigerant passage
(7): Refrigerant inlet header
(8): Refrigerant outlet header
(9): Refrigerant inlet
(11): Refrigerant outlet
(21): First plate
(22): Second plate
(23): Intermediate plate (Brass auxiliary plate)
(24): Inflow channel
(24a): Entrance
(25): Outflow channel
(25a): Exit
(28) (32) (33): Outward bulge for inflow passage
(29) (31) (34): Outward bulge for outlet
(36) (37) (39) (41): Through hole
(35) (38): Notch
(44) (45): Mating convex
(53) (54): Notch edge
(53a) (54a): Deformation part

Claims (5)

A refrigerant inlet header portion and a refrigerant outlet header portion arranged side by side in the ventilation direction, a refrigerant circulation path passing through both header portions, a stacked first plate and second plate, and a refrigerant inlet header portion and a refrigerant A refrigerant inlet / outlet member joined across the outlet header portion, and a heat exchanger connecting device having a refrigerant passage open at both ends and joined to the refrigerant inlet / outlet member, are provided at one end of the refrigerant inlet header portion. A refrigerant inlet is formed, a refrigerant outlet is formed at the same end as the refrigerant inlet in the refrigerant outlet header, and the refrigerant flowing into the refrigerant inlet header from the refrigerant inlet returns to the refrigerant outlet header through the refrigerant circulation path. The refrigerant outlet is arranged so that one end communicates with the refrigerant inlet of the refrigerant inlet header portion and the other end of the refrigerant inlet / outlet portion between both plates of the refrigerant inlet / outlet member. An inflow path that is an inlet that is open to one side edge of the refrigerant, and an outlet that is open to the side edge of the refrigerant inlet / outlet member that has one end communicating with the refrigerant outlet of the refrigerant outlet header and the other end. The outflow passage formed is formed by expanding the first plate and the second plate outward, and the inlet side end portion of the inflow passage and the outlet side end portion of the outflow passage are formed into a cylindrical shape. Around the opening of one end of each refrigerant passage of the connecting device, there is provided a cylindrical fitting convex portion that fits in the inlet side end portion of the inlet / outlet passage of the refrigerant inlet / outlet member and the outlet side end portion of the outlet passage. A heat exchanger in which the fitting convex portion of the member is fitted into the inlet side end portion of the inlet / outlet passage of the refrigerant inlet / outlet member and the end portion of the outlet passage and brazed to the refrigerant inlet / outlet member,
The inner peripheral surface of the inlet side end portion of the inflow passage outward bulging portion, the inner peripheral surface of the outlet side end portion of the outflow passage outer bulging portion, and the outer sides thereof in the first plate of the refrigerant inlet / outlet member Roundness is present in each of the connecting portions with the inner surfaces of the non-bulged portions on both sides of the bulging portion, and the inner peripheral surface of the inlet side end portion of the outer bulging portion for the inflow passage in the second plate and for the outflow passage A roundness exists at the connecting portion between the inner peripheral surface of the outlet side end portion of the outward bulging portion and the inner surface of the non-bulging portion on both sides of the outer bulging portion, and the first and second plates A gap is formed between the roundness and the fitting convex part of the connection device for heat exchanger,
The first and second plates are fitted between the first plate and the second plate on both sides of the portion where the fitting convex portion of the connection device for the heat exchanger is fitted in the inlet and outlet passages of the refrigerant inlet / outlet member. A brazing auxiliary plate for improving the brazing performance with the joint convex portion is arranged, and the edge portion on the fitting convex portion side of the connecting device for heat exchanger in the brazing auxiliary plate is the above-mentioned of the first and second plates. The first and second plates of the refrigerant inlet / outlet member and the connection device for the heat exchanger are inserted into the gap between the roundness and the fitting projection of the connection device for the heat exchanger and close to the outer peripheral surface of the fitting projection. A heat exchanger in which a fitting convex part and a brazing auxiliary plate are brazed. 2. The heat exchanger according to claim 1, wherein a distance between the edge on the fitting convex portion side of the connecting device for heat exchanger in the brazing auxiliary plate and the outer peripheral surface of the fitting convex portion is 0.5 mm or less. The heat exchanger according to claim 1 or 2, wherein an edge portion on the fitting convex portion side of the connecting device for heat exchanger in the brazing auxiliary plate is deformed so as to expand in a thickness direction of the brazing auxiliary plate. The clearance gap between the said roundness of the 1st and 2nd plate of a refrigerant | coolant in / out member, the fitting convex part of the connection apparatus for heat exchangers, and the edge part of a brazing auxiliary | assistant plate is filled with the brazing material. The heat exchanger in any one of 1-3. An intermediate plate is interposed between the first plate and the second plate of the refrigerant input / output member, and the intermediate plate is brazed to the first plate and the second plate, and the inflow path and the outflow of the refrigerant input / output member are connected to the intermediate plate. The inflow swells for the inflow passages of the first and second plates and the outflow swells for the outflow passages of the first and second plates so that the paths intersect with each other when viewed from the stacking direction of all the plates. A notch and a through-hole are formed, and the intermediate plate also serves as a brazing auxiliary plate, and both sides of the notch forming the end on the inlet side of the inflow passage and the end on the outlet side of the outflow passage in the intermediate plate An edge portion enters the gap between the roundness of the first and second plates of the refrigerant inlet / outlet member and the fitting convex portion of the connecting device for heat exchanger, and the fitting convex portion of the connecting device for heat exchanger A heat exchanger according to any one of claims 1 to 4 in close proximity to the outer peripheral surface.

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