JP2009275956A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger can improve compression strength at brazing sections of a header tank. <P>SOLUTION: In this heat exchanger in which the header tank 20 is constituted by integrally brazing a plate member 50 connected with a tube 11, a tank member 30 and an intermediate layer material 40, and the tank member 30 is provided with bulging sections 31 constituted as fluid circulating pathways 35 inside and bulging from brazing planes 32, 42 to a side opposite to the intermediate layer material 40, and first curved sections 33 disposed at elementary parts of the bulging sections 31 and having the curved shape, the intermediate layer material 40 is provided with projecting sections 41 formed on positions corresponding to the bulging sections 31 and projecting from the brazing planes 32, 42 to a tank member 30 side, and second curved sections 43 disposed at elementary parts of the projecting sections 41 and having the curved shape, wherein the second curved sections 43 are formed roughly along the curved shape of the first curved sections 33. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a heat exchanger, and is suitable for application to an evaporator of a CO ₂ water heater, for example.

Conventionally, as described in Patent Document 1, a header tank that collects and distributes refrigerant in a heat exchanger includes a tank member in which a bulging portion whose inside functions as a refrigerant flow path is press-molded, and a plurality of 2. Description of the Related Art There is known a plate member that includes a plate member to which a tube is connected and an intermediate layer material interposed between a tank member and a plate member. These three members are joined together by brazing in a laminated state.
Japanese Patent Laying-Open No. 2003-314987 (FIG. 12)

Incidentally, in such header tanks, for example, the flow passage in a CO ₂ refrigerant, etc. (bulged portion) inside has a higher pressure, the brazing surface between the tank member and the intermediate layer member, both members in particular the root portion of the bulging portion As a result, the stress acts in the direction of peeling off the brazing part, and the brazed part is easily damaged.

  In view of the above problems, an object of the present invention is to provide a heat exchanger that can improve the pressure resistance in the brazed portion of the header tank.

  In order to achieve the above object, the present invention employs the following technical means.

  The invention according to claim 1 includes a plurality of tubes (11) through which a fluid passes and a header tank (20) disposed at an end (111) of the plurality of tubes (11). ) Is interposed between the plate member (50) to which the tube (11) is connected, the tank member (30) combined with the plate member (50), and between the tank member (30) and the plate member (50). The intermediate layer material (40) and the respective members (30, 40, 50) are integrally brazed, and the tank member (30) has a fluid flow passage (35) inside. And a bulging portion (31) swelled from the brazing plane (32, 42) between the tank member (30) and the intermediate layer material (40) to the opposite side of the intermediate layer material (40), Curved shape at the root of the protrusion (31) In the heat exchanger formed with the first curved portion (33) forming the intermediate layer material (40), the intermediate layer material (40) is formed at a position corresponding to the bulging portion (31) and brazed planes (32, 42). And a second curved portion (43) having a curved shape at the root portion of the projected portion (41) is formed, and the second curved portion (43) is formed. ) Is formed so as to substantially follow the curved shape of the first curved portion (33).

  The tank member (30) (the bulging portion (31)) is generally formed by press forming (bending) a metal such as aluminum or an aluminum alloy, and the root portion of the bulging portion (31). Is formed with a first curved portion (R portion (33)) that is curved so that the metal is pulled in the bulging direction. According to this structure, with respect to the 1st curved part (R part 33) of the bulging part (31) of a tank member (30), the 2nd curved part (41) of the protrusion part (41) of an intermediate | middle layer material (40) ( Since the R portion 43) follows, the clearance between the tank member (30) and the intermediate layer material (40) in the curved portion (R portions 33, 34) is narrower than in the case where the intermediate layer material (40) is flat. be able to.

  At the time of brazing, the brazing material turns around the portion along which the second bending portion (R portion 43) extends along the first bending portion (R portion 33), and each bending portion (R) also at the root portion of the bulging portion (31). Since brazing is performed along the portions 33 and 43), the brazing region can be enlarged as compared with the case where the intermediate layer material (40) is flat.

  In brazing the flat intermediate layer material (40) and the tank member (30), the tank member (30) is generally placed on the brazing plane (32, 42) by the pressure in the flow passage (35). ) And the intermediate layer material (40) are peeled off (force perpendicular to the brazing plane (joint surface)). For this reason, especially when the pressure in the flow passage (35) becomes high, the brazed portion was easily damaged. However, according to the present configuration, each curved portion (R portion 33, 43) brazed to each curved portion (R portion 33) is not in a direction perpendicular to the joint surface due to the pressure in the flow passage (35). , 43) acts as a force in the plane direction (shear direction), so that the tank member (30) and the intermediate layer material (40) are not easily peeled off.

  That is, according to this configuration, the brazing region is expanded, and the force acting on each curved portion (R portion 33, 43), which is the expanded brazing region, is applied to the shearing direction of the joint surface instead of the peeling direction. By doing, the pressure-resistant intensity | strength in the brazing part of a header tank (20) can be improved.

  In the second aspect of the present invention, the second curvature radius (Ra), which is the curvature radius of the surface of the second curved portion (43) facing the tank member (30), is equal to that of the first curved portion (33). It is 1 time or more and 1.5 times or less of the 1st curvature radius (Rt) which is a curvature radius in the surface on the side facing an intermediate | middle layer material (40).

  According to this configuration, the second radius of curvature (Ra) that is the radius of curvature of the second curved portion (43) is set to be equal to or greater than the first radius of curvature (Rt) that is the radius of curvature of the first curved portion (33). The projecting portion (41) is accommodated in the bulging portion (31) without the first bending portion (33) and the second bending portion (43) colliding (contacting) to improve the assembling property. Can do. In addition, by setting the first bending portion (33) to 1.5 times or less the first curvature radius (Rt), the second bending portion (43) follows the curved shape of the first bending portion (33) as much as possible. It can be a shape. Thereby, the clearance gap between a tank member (30) and an intermediate | middle layer material (40) is narrowed, and brazing material can rotate efficiently toward a curved part (33, 43) from a brazing plane (32, 42). can do. As a result, the brazing region is enlarged, and the pressure resistance strength at the brazed portion can be improved to suppress breakage.

  The invention according to claim 3 is characterized in that the second radius of curvature (Ra) is the same size as the first radius of curvature (Rt).

  According to this configuration, the second curved portion (43) of the intermediate layer material (40) smoothly follows the curved shape of the first curved portion (33) of the tank member (30). , 42) to the curved portions (33, 43) so that the brazing material can be efficiently rotated.

  In the invention according to claim 4, the protrusion amount (h1) of the protrusion portion (41) from the brazing plane (32, 42) is the side of the first bending portion (33) facing the intermediate layer material (40). The first curvature radius (Rt), which is the curvature radius of the surface, is in the range of 0.1 to 1.0 times.

  If the protruding amount (h1) of the protruding portion (41) is large, processing is difficult and the amount of fitting into the bulging portion (31) is increased, and the fluid flow path (35) is narrowed. Further, if the protrusion amount (h1) is too small, it is not possible to sufficiently enlarge the brazing region. According to this configuration, by setting the protrusion amount (h1) within the above range, the brazing region can be appropriately expanded without narrowing the fluid flow path (35), and the molding is easy because the processing is easy. It can be set as a suitable embodiment also in terms of sex.

  In the invention according to claim 5, the end in the longitudinal direction, which is the direction in which the fluid flows through the flow passage (35) in the intermediate layer material (40), is a flat portion (47) in which no protrusion (41) is formed. The partition part (60a) which closes the opening of the longitudinal direction edge part of the flow path (35) is provided in the planar part (47) formed.

  The flow passage (35) is closed at the end (opening) in the longitudinal direction (fluid flow direction) by the partition plate (60a) in order to ensure airtightness. According to this configuration, the projecting portion (41) is not formed over the entire area in the longitudinal direction of the intermediate layer material (40) but is formed in a part thereof, so that the longitudinal end portion of the intermediate layer material (40) is formed. Can be formed flat. And the joining surface of a partition plate (60a) and an intermediate | middle layer material (40) can be made into a plane by providing a partition plate (60a) in the longitudinal direction edge part of the intermediate | middle layer material (40) formed flat. Therefore, airtightness can be improved. The partition plate (60a) is joined to adjacent members such as the intermediate layer material (40) and the tank member (30) by brazing, and is fixed to these adjacent members while maintaining airtightness.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment description later mentioned.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the heat exchanger is applied to an evaporator used in a CO ₂ water heater, and the overall configuration will be described first with reference to FIG.

  FIG. 1 is an overall perspective view showing an evaporator 1 in the first embodiment. Hereinafter, the vertical and horizontal directions indicated by arrows in FIG. The evaporator 1 (air heat exchanger) of the present embodiment receives heat from an outside air fan (not shown) and heats heat absorbed by the refrigerant decompressed by an expansion valve (not shown) by heat exchange with the outside air. It is an exchanger. As shown in FIG. 1, the evaporator 1 is composed of two rows of core portions 10 and header tanks 20 positioned above and below each core portion 10, and each member (hereinafter described) constituting these is made of aluminum. Or it consists of an aluminum alloy, it is assembled | attached by fitting, caulking, jig | tool fixing, etc., and it brazes integrally by the brazing material previously provided in the required site | part of each member surface.

  The core portion 10 includes a plurality of tubes 11 through which refrigerant flows and a plurality of corrugated fins 12 that are alternately stacked, and the outermost fins 12 on the left and right sides are parallel to the tubes 11. Side plates 13 that extend and reinforce the core portion 10 are arranged, and these are integrally brazed. In this embodiment, the core portion 10 is stacked in two rows in parallel in the longitudinal direction (left-right direction) of the header tank 20. Hereinafter, the depth direction perpendicular to the longitudinal direction of the header tank 20 (left and right direction, stacking direction of the tubes 11) is referred to as the width direction (parallel direction of the tubes 11).

  Each tube 11 is a multi-hole tube having a flat cross section, and the plurality of tubes 11 are arranged in parallel at predetermined intervals so that their flat surfaces are parallel to each other. . Further, the outside air (air) that exchanges heat with the refrigerant flows in the parallel direction (width direction) of the tubes 11 as indicated by an arrow A in FIG.

  A pair of header tanks 20 extending in the stacking direction of the tubes 11 are provided at the upper and lower portions of the core portion 10 in FIG. 1, that is, the tube end portions 111 (see FIG. 2) in the longitudinal direction of the plurality of tubes 11.

  Next, the structure of the header tank 20 which is the principal part of this invention is explained in full detail using FIGS. FIG. 2 is an exploded perspective view showing the header tank 20 and the tube 11. FIG. 3 is a cross-sectional view showing a joint portion between the tank member 30 and the intermediate layer material 40, and FIG. 4 is an enlarged view showing a portion surrounded by a broken line in FIG.

  First, the configuration of the header tank 20 will be described. As shown in FIG. 2, the header tank 20 includes a tank member 30, an intermediate layer material 40, and a plate member 50. The header tank 20 has a three-layer structure in which the members 30, 40, and 50 are stacked in this order. Is formed.

  First, the tank member 30 is obtained by press-working an elongated plate-like aluminum alloy clad with a brazing material. The tank member 30 has two rows of bulged portions 31 formed by deforming into a substantially U-shaped cross section, and an intermediate layer material 40. And a flat surface portion 32 formed as a flat surface facing each other. The flat portion 32 is formed on both sides in the width direction of the bulging portion 31 and has a symmetrical shape as a whole. The bulging portion 31 swells on the opposite side to the intermediate layer material 40, and causes the refrigerant to flow in the longitudinal direction of the header tank 20 in the inner space.

  As shown in FIGS. 3 and 4, a bend R portion 33 (hereinafter simply referred to as “pressed”) is formed at the boundary between the bulging portion 31 and the flat portion 32 (the root of the U-shaped bulging portion 31). "R portion 33") is formed. The first radius of curvature Rt, which is the radius of curvature of the surface of the R portion 33 on the side facing the intermediate layer material 40, is about 1 mm to 2 mm. The R portion 33 corresponds to an embodiment of a “first bending portion”.

  Next, the intermediate layer material 40 is formed by pressing an elongated plate-shaped bare material along the tank member 30, and is formed by deforming the cross-sectionally isosceles trapezoidal shape into two rows of protrusions 41, a tank It has a flat portion 42 facing the member 30. Each protrusion 41 protrudes in a stepped manner toward the tank member 30 at a position corresponding to the bulging portion 31 of the tank member 30, and is formed over the entire length (left and right) direction. The flat portion 42 is formed on both sides of the protruding portion 41 in the width direction, and the intermediate layer material 40 as a whole has a symmetrical shape about the center in the width direction.

  As shown in FIGS. 3 and 4, the side of the isosceles trapezoidal shape at the base of the protrusion 41 is a bent R portion 43 (hereinafter simply referred to as “R portion 43”) by press working. .) Is formed. The second radius of curvature Ra (see FIG. 4), which is the radius of curvature of the surface of the R portion 43 facing the tank member 30, is about 1 mm to 2 mm, and the first radius of the R portion 33 of the tank member 30 is about 1 mm to 2 mm. It is formed to have approximately the same size as the curvature radius Rt. Further, the protruding amount h1 (see FIG. 4) of the protruding portion 41 is set to about half of the first radius of curvature Rt (h1 = Rt × 0.5). The R portion 43 corresponds to an embodiment of a “second bending portion”. At the time of assembly, the flat surface portion 32 of the tank member 30 and the flat surface portion 42 of the intermediate layer material 40 come into contact with each other, and the protruding portion 41 is fitted into the bulging portion 31 by the protruding amount h1. In addition, both the plane parts 32 and 42 correspond to a “brazing plane”.

  A coefficient K (h1 = Rt × K) that defines the protrusion amount h1 with respect to the first curvature radius Rt can be set to 0.1 or more and 1.0 or less. In one desirable mode, coefficient K is set in the range of 0.1 or more and 0.5 or less. Further, the coefficient K can be selected as a relatively small value in consideration of suppressing the degree of processing of each member. For example, a range of 0.1 or more and 0.3 or less can be selected. On the other hand, in consideration of forming brazing between the tank member 30 and the intermediate layer material 40 and between the intermediate layer material 40 and the plate member 50 in consideration of the strength against the internal pressure, it is relatively large. A value can be selected, for example, a range of 0.5 or more and 1.0 or less can be selected.

  Further, as shown in FIG. 2, the intermediate layer material 40 is provided with a plate hole 44 at a position corresponding to the tube end portion 111. And the step part 45 which regulates the insertion position of the tube end part 111 in the middle of plate | board thickness is provided in the width direction edge part of the plate hole 44. As shown in FIG. Further, the plate hole 44 is made larger than the cross-sectional shape of the tube end portion 111.

  Next, the plate member 50 is formed by pressing an elongated plate-like aluminum alloy clad with a brazing material, and is formed by deforming the cross section into a substantially isosceles trapezoidal shape, with two rows of convex portions 51, and an intermediate layer material. 40 and a flat surface portion 52 facing each other. Each convex part 51 protrudes to the intermediate layer material 40 side, and is formed so as to correspond in position and shape along the protruding part 41 of the intermediate layer material 40 when assembled. The flat portion 52 is formed on both sides of the protruding portion 41 in the width direction. Further, claw portions 53 extending to the intermediate layer material side are formed by pressing at both ends in the width direction. Further, a tube insertion hole 54 is formed through at a position corresponding to the tube end 111. The tube insertion hole 54 is formed to be slightly larger than the tube end portion 111.

  The overall length in the longitudinal (left and right) direction and the overall length in the width direction of the tank member 30, the intermediate layer material 40, and the plate portion 50 are substantially equal.

  The assembly of each member detailed above will be described. First, the plate member 50 is brought into contact with the tank member 30 with the intermediate layer material 40 interposed therebetween. At this time, the flat surface portion 32 of the tank member 30, the flat surface portion 42 of the intermediate layer material 40, and the flat surface portion 52 of the plate member 50 overlap in the assembly direction, and the convex portion 51 of the plate member 50 is the protruding portion 41 of the intermediate layer material 40. Overlapping along Further, the plate hole 44 of the intermediate layer material 40 and the tube insertion hole 54 of the plate member 50 are arranged coaxially. Then, the header member 20 is formed by caulking the tank member 30 with the claw portion 53 of the plate member 50 in a state where these three members (the tank member 30, the intermediate layer member 40, and the plate member 50) are laminated. Thereafter, the tube end portion 111 is inserted into the tube insertion hole 54 and the plate hole 44, and the tank member 30, the intermediate layer material 40, the plate member 50, and the tube 11 are brazed together. And between the bulging part 31 of the tank member 30 and the protrusion part 41 of the intermediate | middle layer material 40, the flow path 35 (refer FIG. 3) through which a refrigerant | coolant flows through the inside of the header tank 20 in a longitudinal (left-right) direction is formed. Is done. The flow passage 35 communicates with the inside of the tube 11.

  Furthermore, substantially semicircular side partition plates 60a are brazed to both ends in the longitudinal (left and right) direction of the flow passage 35 to ensure airtightness, and openings (not shown) formed by the bulging portions 31 are formed. It is trying to block. Further, a central partition plate 60b having a similar shape is disposed in the middle of the flow path 35 in the longitudinal direction, and the flow path 35 is divided into two in the longitudinal direction.

  In the present embodiment, respective refrigerant inlets (not shown) corresponding to the two bulging portions 31 (flow passages) are formed at the right end with respect to the wind flow direction of the upper header tank 20. At the left end, respective refrigerant outlets (not shown) corresponding to the two flow passages 35 are formed. Therefore, the refrigerant flowing in from the refrigerant inlet flows into the right bulging portion 31 (flow passage 35) of the central partition plate 60b, and the right side tube 11 group of the central partition plate 60b and the bulging portion of the lower header tank 20 are connected. 31 (flow passage 35), U-turns, flows through the tube 11 group on the left side of the central partition plate 60b and the bulge 31 (flow passage) on the left side of the central partition plate 60b, and flows out from the refrigerant outlet. During this time, the refrigerant is cooled by exchanging heat with external air in the core portion 10.

  Next, the operation of the characterizing portion of the present invention will be described with reference to FIG. When the tank member 30, the intermediate layer material 40, the plate member 50, and the tube 11 are brazed together, the plane portion 32, the plane portion 42, and the R portion are brazed by the brazing material clad between the tank member 30 and the plate member 50. 33 and the R portion 43 are joined. A fillet 70 is formed of brazing material at the end of the joint (the corner formed by the R portion 33 and the R portion 43).

  In this embodiment, since the R portion 43 of the protruding portion 41 on the intermediate layer material 40 side is along the R portion 33 of the bulging portion 31 formed during press molding, the intermediate layer material 40 is flat. Compared to the case, the gap (clearance) between the tank member 30 and the intermediate layer material 40 in the R portion 33 of the bulging portion 31 can be reduced. At the time of brazing, the brazing material rotates at the portion where the R portion 43 of the intermediate layer material 40 is along the R portion 33 of the bulging portion 31, and the R portion 33 of the bulging portion 31 is also along the R portion 33. It is brazed. That is, the brazing region in this embodiment is a region of the flat portions 32 and 42 and the R portion 33.43, and is compared with the case where the intermediate layer material 40 is flat (the case where the protruding portion 41 is not provided). Thus, the brazing area can be enlarged. In the brazing between the flat intermediate layer material 40 and the tank member 30, generally, the brazing plane (corresponding to the plane portions 32 and 42 in this embodiment) is indicated by a black arrow in FIG. The force in the direction in which the tank member 30 and the intermediate layer material 40 are peeled off (the direction perpendicular to the brazing plane (joint surface) shown in FIG. . For this reason, the brazed part was easily damaged. However, in the present embodiment, the brazed R portions 33 and 43 act as forces in the surface direction (tangential direction and shear direction) of the R portions 33 and 43 rather than in the direction perpendicular to the joint surface. The tank member 30 and the intermediate layer material 40 are not easily peeled off.

  That is, according to the present embodiment, the brazing area can be enlarged, and the force acting on the R portions 33 and 43 that are the enlarged brazing areas acts in the shearing direction, not in the peeling direction, so that the header The pressure strength at the brazed portion of the tank 20 can be improved.

In particular, in this embodiment, CO ₂ is used as the refrigerant, and the refrigerant pressure in the heat pump unit of the water heater becomes high. As described above, when the internal pressure becomes high, the brazed portion is particularly easily damaged, and an effect can be obtained by applying the present invention. Moreover, in this embodiment, the protrusion part 41 of the intermediate | middle layer material 40 can be easily formed by press molding.

  Furthermore, since the protrusion amount h1 of the protrusion 41 is set to about half of the first curvature radius Rt of the R portion 33 (h1 = Rt × 0.5), there is an advantage that the protrusion amount is small and it is easy to mold. is there. Note that, from the viewpoint of reducing the moldability and the gap, the protruding amount h1 of the protruding portion 41 is generally set in a range of 0.1 to 0.5 times the first radius of curvature Rt of the R portion 33. Is desirable. In addition, by setting within this range, the brazing region can be appropriately expanded without narrowing the refrigerant flow passage (35).

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is an enlarged view showing a joint portion between the tank member and the intermediate layer material in the second embodiment.

  In the present embodiment, the same reference numerals as those in the first embodiment are assigned to the constituent members common to the first embodiment, and the description below will focus on differences from the first embodiment. To do. In the present embodiment, the second curvature radius Ra of the R portion 43 on the intermediate layer material 40 side is formed larger than the first curvature radius Rt of the R portion 33 on the tank member 30 side (Ra> Rt), The difference from the first embodiment is that the protrusion amount h2 of the protrusion 41 is formed to be substantially the same (h2≈Rt) as the first curvature radius Rt of the R portion 33.

  In the case of the present embodiment, the R portion 43 on the intermediate layer material 40 side does not fit closely with the R portion 33 on the tank member 30 side, and a slight gap is formed between the R portions 33 and 43. However, at the time of brazing, the brazing material rotates around this gap, and the fillet 70 is formed.

  If the second curvature radius Ra of the R portion 43 is not less than 1 and not more than 1.5 times the first curvature radius Rt of the R portion 33, the R portion 43 is slightly between the R portions 33 and 43 as in the present embodiment. In general, the R portion 43 can be assembled along the R portion 33 while the gap is formed, and the R portions 33 and 43 can be brazed as in the first embodiment. Accordingly, the pressure strength can be improved as compared with the case where the protruding portion 41 is not formed on the intermediate layer material 40.

  In setting the second curvature radius Ra of the R portion 43, the most desirable case is when the curvature radii Rt and Ra of both the R portions 33 and 43 are the same as described in the first embodiment. However, in terms of formability, the dimensions in the basic design of the second curvature radius Ra of the R portion 43 are slightly larger than the first curvature radius Rt of the R portion 33 from the viewpoint of dimensional error and accuracy, as in this embodiment. It is better to set the dimensions. This is because if the second radius of curvature Ra of the R portion 43 is smaller than the first radius of curvature Rt of the R portion 33, the assemblability is deteriorated.

(Other embodiments)
In the first embodiment, the protrusion amount h1 of the protrusion 41 is about half of the first curvature radius Rt of the R portion 33. However, as in the second embodiment, the protrusion amount h1 is substantially the same as the first curvature radius Rt of the R portion 33. The same may be formed. Thus, the protrusion amount h1 of the protrusion 41 is the same as the first curvature radius Rt of the R portion 33, and the second curvature radius Ra of the R portion 43 is the same as the first curvature radius Rt of the R portion 33. If there is, the R portion 43 of the intermediate layer material 40 is completely along the R portion 33 of the tank member 30, so that the brazing region can be enlarged and the gap between the two members can be made as narrow as possible to obtain an ideal form. .

  Further, the protrusion amount h1 of the protrusion 41 is set to be not less than 0.1 times and not more than 0.5 times the first radius of curvature Rt of the R portion 33 as described in the first embodiment from the viewpoint of formability. However, it may be set in other ranges.

  In each of the above embodiments, the protrusion 41 is formed by press molding so that a recess is formed on the plate member 50 side. However, for example, an intermediate layer material 40B shown in FIG. The surface of the layer material 40B facing the plate member 50 may be flat (planar portion 46). In this case, the protrusion 41 can be formed by forming recesses on both sides by forging (plastic deformation) from the surface facing the tank member 30. In this way, by forming the surface on the side facing the plate member 50 flat (planar portion 46), it is not necessary to form the convex portion 51 on the plate member 50. It can be simplified.

  In the above-described embodiment, the projecting portion 41 is formed over the entire length (left and right) direction of the intermediate layer material 40. For example, as in the intermediate layer material 40C illustrated in FIG. You may form the protrusion part 41 so that the plane part 47 (part shown with a hatching in FIG. 7) may remain in the edge part of a horizontal direction. According to this configuration, by attaching the side partition plate 60a to the flat portion 47, the joint surfaces of the side partition plate 60a and the intermediate layer material 40C can be made flat, so that the airtightness can be improved.

  In the said embodiment, although the tube 11 was comprised as the type of evaporator 1 in which two rows are formed, the number of the tubes 11 may be one row or a plurality of three or more rows.

  In the above embodiment, the two flow paths 35 arranged in parallel are configured as independent shapes, but the refrigerant flow is not limited, and the flow paths 35 may be configured so that the refrigerant flows in order. . In this case, by adopting a type in which the core portions 10 are provided in two rows, the core portion 10 on the windward side and the core portion 10 on the leeward side can be efficiently evaporated, and the heat exchange performance of the entire evaporator 1 can be improved. it can.

In the above embodiment, the configuration as an evaporator 1 constituting the CO ₂ water heater, the refrigerant is not limited to CO _2. Moreover, you may apply this invention not to a water heater but to the header tank of the evaporator and heat radiator which comprise the supercritical refrigeration cycle apparatus of a vehicle air conditioner. That is, the present invention can be applied as long as the header tank is constituted by the tank member, the intermediate layer material, and the plate member.

It is a whole perspective view which shows the evaporator in 1st Embodiment. It is a disassembled perspective view which shows a header tank and a tube. It is sectional drawing which shows the junction part of a tank member and an intermediate | middle layer material. It is an enlarged view which shows the site | part enclosed with the broken line in FIG. It is an enlarged view which shows the junction part of the tank member and intermediate | middle layer material in 2nd Embodiment. The side view which shows the intermediate | middle layer material in another embodiment. The perspective view which shows the intermediate | middle layer material in another embodiment.

Explanation of symbols

1 Evaporator (heat exchanger)
DESCRIPTION OF SYMBOLS 10 Core part 11 Tube 20 Header tank 30 Tank member 31 Expansion part 32 Plane part (brazing plane)
33 Bending R part (first bending part)
35 Flow path 40 Intermediate layer material 41 Projection part 42 Plane part (brazing plane)
43 Bent R part (second bending part)
47 plane part (end part of longitudinal direction of intermediate | middle layer material 40C)
50 Plate member 60a Side partition plate (partition plate)
111 Ends of the tube 11 h1, h2 Projection amount of the projection 41 Rt First curvature radius (curvature radius on the surface of the bending R portion 33 facing the intermediate layer material)
Ra second curvature radius (curvature radius on the surface of the bending R portion 43 facing the tank member)

Claims (5)

A plurality of tubes (11) through which the fluid passes, and a header tank (20) disposed at an end (111) of the plurality of tubes (11),
The header tank (20) includes a plate member (50) to which the tube (11) is connected, a tank member (30) combined with the plate member (50), the tank member (30), and the plate member. (50) and an intermediate layer material (40) interposed therebetween, and these members (30, 40, 50) are integrally brazed, and the tank member (30) The intermediate layer material (40) is configured from the brazing plane (32, 42) between the tank member (30) and the intermediate layer material (40) while the inside is configured as the fluid flow path (35). In the heat exchanger in which the bulging portion (31) swelled on the opposite side and the first bending portion (33) having a curved shape at the root portion of the bulging portion (31) are formed,
The intermediate layer material (40) has a protrusion (41) formed at a position corresponding to the bulging portion (31) and protruding from the brazing plane (32, 42) toward the tank member (30). And a second bending portion (43) having a curved shape at the base portion of the protruding portion (41) is formed, and the second bending portion (43) is a curved shape of the first bending portion (33). The heat exchanger is formed so as to substantially follow the above.   The second radius of curvature (Ra), which is the radius of curvature of the surface of the second curved portion (43) facing the tank member (30), is the intermediate layer material (40) of the first curved portion (33). 2. The heat exchanger according to claim 1, which is not less than 1 and not more than 1.5 times the first radius of curvature (Rt), which is the radius of curvature of the surface on the opposite side.   The heat exchanger according to claim 2, wherein the second radius of curvature (Ra) is the same size as the first radius of curvature (Rt).   The protruding amount (h1) of the protruding portion (41) from the brazing plane (32, 42) is the radius of curvature of the surface of the first curved portion (33) on the side facing the intermediate layer material (40). The heat exchanger according to any one of claims 1 to 3, wherein the first curvature radius (Rt) is in a range of 0.1 to 1.0 times.   In the intermediate layer material (40), the end in the longitudinal direction, which is the direction in which the fluid flows through the flow passage (35), is formed as a flat portion (47) where the protrusion (41) is not formed, The flat surface portion (47) is provided with a partition plate (60a) for closing an opening at a longitudinal end portion of the flow passage (35). A heat exchanger according to claim 1.

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