JPH10281685A - Laminated heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To braze a joint to a plate by brazing in a furnace without brazing to a plate having an exit or inlet of one side end of a laminating direction at a jig. SOLUTION: A distribution plate 24 is clad by a brazing material only at a central side of the laminated heat exchanger. Annular protrusions 27a, 27b are formed at exist and outlet 4, 5 by burring. A joint 31 connected to the plate 24 has protrusions 34, 35 engaged with the protrusions 27a, 27b axially in through holes 32, 33. Thus, the protrusions 34, 35 of the joint 31 are brazed at inner surfaces of the protrusions 27a, 27b in a furnace, while a central side of the exchanger is not clad at the brazing material and hence a jig is not brazed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated heat exchanger used for an evaporator or the like constituting a refrigeration cycle of a vehicle air conditioner, and more particularly to an improvement in a structure for mounting a joint for fixing an expansion valve.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 8-8653 discloses an invention in which a joint (especially one for fixing an expansion valve) is attached to an outflow / inlet port of a plate arranged at the end of the stacking heat exchanger in the stacking direction.
In this publication, an expansion valve mounting member 30 is attached to an inlet / outlet portion forming plate 20 of the laminated heat exchanger 1 by holes 21 and 22 of the inlet / outlet portion forming plate 20.
23 is brought into contact with the holes 32 and 33 of the expansion valve mounting member 30 so as to communicate with each other, and then brazed.

[0003] Brazing of the expansion valve mounting member 30 to the entrance / exit portion forming plate 20 is performed by brazing in a furnace using a brazing material clad on the outer surface of the entrance / exit portion forming plate 20 in the laminating direction. It is conceivable to use However, if the brazing in the furnace is performed with the brazing material clad on the outer surface in the laminating direction of the entrance / exit portion forming plate, it is necessary to fix the assembled body of the laminated heat exchanger with a jig. There is a concern that the tool may be brazed to the door portion forming plate.

[0004] Therefore, although not explicitly stated in the above-mentioned publication, today, the brazing material is not brazed on the outer surface of the plate for forming the inlet / outlet pipe in the laminating direction, but is brazed to the plate for forming the inlet / outlet portion of the expansion valve mounting member. Is usually performed by brazing the heat exchanger in a furnace and then brazing the torch using a burner or the like.

[0005]

However, as described above, after the heat exchanger assembly is brazed in a furnace to form a heat exchanger, the expansion valve mounting member is further brazed to the heat exchanger. Doing so complicates the heat exchanger manufacturing process,
There is a problem that the work is complicated. When the expansion valve mounting member is torch brazed to the entrance / exit portion forming plate, the entrance / exit portion forming plate is also heated, and the entrance / exit portion forming plate and another plate (for example, a flat plate) are heated.
There is a possibility that the brazing material used for brazing may melt.

Accordingly, the present invention is directed to a laminated heat type in which a jig can be brazed to a plate having an outflow port at one end in the laminating direction without brazing the joint to the plate by furnace brazing. It is intended to provide an exchanger.

[0007]

According to the laminated heat exchanger of the present invention, a plurality of tube elements are laminated with fins interposed therebetween, and a plate having an outflow port formed at one end in the laminating direction. In a laminated heat exchanger in which a joint having a through hole in the plate is joined so that the through hole communicates with the outflow / inlet port, the plate has a brazing material on the central side surface of the laminated heat exchanger. An annular projection is formed at the outflow / inlet of the plate and is formed on the center side surface of the anti-lamination type heat exchanger, and the joint has a projection that can be fitted into the annular projection of the plate. It is formed in the axial direction of the through hole (claim 1). The plate may be a doorway passage plate (Claim 2) or a flat plate (Claim 3).

Accordingly, since the brazing material is clad on the inner peripheral surface of the annular protrusion at the outlet and the inlet of the plate, that is, on the central side surface of the laminated heat exchanger, the brazing is performed by furnace brazing.
The projection of the joint is brazed to the inner surface of the inlet and outlet of the plate, and the outer surface of the plate is cured during brazing in a furnace because the brazing material is not clad on the central side of the anti-lamination type heat exchanger of the plate. Even if the jig is fixed with the jig, the jig is not brazed to the plate. In addition, as this coupling, there is a coupling for connecting the expansion valve and the outflow / inlet port.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an evaporator 1 used in, for example, an air conditioner for a vehicle, as a stacked heat exchanger.
And a tube element 3 are alternately laminated in a plurality of stages to form a core body, and an inlet 4 and an outlet 5 for a heat exchange medium are provided at one end of the tube element 3 in the laminating direction, for example, a four-pass method. The tube element 3 is a molded plate shown in FIG. 3 except for tube elements 3a and 3b at both ends in the stacking direction of the core body, a tube element 3c having an enlarged tank described later, and a tube element 3d substantially at the center. 6 are joined face to face.

The forming plate 6 is formed by pressing an aluminum alloy whose main material is aluminum with a brazing material clad on both sides, and has two bowl-shaped bulging portions 8 at one end. , 8 are formed, followed by a bulging portion 9 for forming a passage, and a pipe mounting portion for mounting a communication pipe 29 described later is provided between the bulging portions 8 for forming a tank. A concave portion 10 is formed, and a partition wall 11 extending from between the two tank forming bulging portions 8 and 8 to near the other end of the forming plate 6 is formed. A plurality of beads 7 arranged at a predetermined regularity are formed in the passage forming bulging portion 9.

The bulging portions 8 for forming the tank are bulged larger than the bulging portions 9 for forming the passages, and the partition walls 11 are formed so as to be flush with the joining margin 12 on the periphery of the forming plate 6. When the two forming plates 6 are joined at their peripheral edges, the partition walls 11 are also joined, and a pair of tanks 13, 13 are formed by the opposed tank forming bulging portions 8, 8, and are opposed to each other. A U-shaped heat exchange medium passage 14 connecting the tanks 13 with the passage forming bulging portion 8.
Is formed.

The tube elements 3a on both sides in the stacking direction,
3b, one tube element 3b is configured by joining a flat plate 15 without irregularities to the forming plate 6 shown in FIG. 3, and the other tube element 3a is
The flat plate 16 shown in FIG. 4 is joined to the forming plate 6 shown in FIG. The flat plate 16 shown in FIG. 4 is formed to have substantially the same size as the forming plate 6 to be joined thereto, and a first hole 17 is formed in a portion of the forming plate 6 facing one of the bulging portions 8 for forming a tank. A second hole 18 is formed in a portion facing the pipe mounting recess 10.

Further, the tube element 3c is formed by face-to-face joining of forming plates 19, 19 in which one of the tank-forming bulging portions is enlarged so as to approach the other tank-forming bulging portion. Element 3c has
A tank 13 having the same size as the tank 13 formed in the other tube element 3 and a tank 13a expanded so as to fill the pipe mounting recess 10 are formed.

The evaporator 1 is shown in FIGS.
As shown in FIG.
The first and second two tank groups 20 and 21 extending in the stacking direction (the direction orthogonal to the ventilation direction) are constituted by a series of the tanks 13 and 13a that have been butted by each other. , Enlarged tank 13a
The first tank group 20 includes the tanks 13 through the through holes 22 (shown in FIG. 3) formed in the tank forming bulging portion 8 except for the tube element 3 d located substantially at the center in the stacking direction. Is communicated.

That is, the tube element 3d joins the forming plate 6 shown in FIG. 2 and the forming plate 23 which has the same shape and does not have the through-hole in one of the tank forming bulging portions 8 in a face-to-face manner. The first tank group 20 includes a first tank block α including the enlarged tank 13a and a second tank block β communicating with the outlet 5 by the tube element 3d. It is divided into and. In addition, all the tanks of the second tank group 21 are communicated via the through holes 22 without being partitioned, and constitute a third tank block γ.

At one end in the stacking direction, the flat plate 16
As shown in FIG. 5, the inlet / outlet passage plate 24 is joined because the outlet and inlet need to be provided in the middle of the side by pipe connection. The first and second two overhang portions 25 and 26 are formed in the entrance passage plate 24 by press working so as to be swelled side by side by press working, and an annular protrusion 27a is formed at one end of the first overhanging portion 25 by burring work. The inflow port 4 that forms
Outlets 5 having annular projections 27b formed by burring at the same end of the second overhanging portion 26 are formed. Then, by joining the entrance / exit passage plate 24 to the flat plate 16, the entrance / exit passage plate 24 is joined.
An inflow passage 28 communicating with the inflow port 4 and an outflow passage 29 communicating with the outflow port 5 are formed between the inflow passage 2 and the flat plate 16.
8 communicates with the first tank block α by connecting the other end of the communication pipe 30, one end of which is connected to the enlarged tank 13 a, to the second hole 18 of the flat plate 16.
It communicates with the second tank block β via the second hole 18 of the flat plate 17. And in the inflow port 4 and the outflow port 5,
A joint 31 for fixing an expansion valve to be described later is joined.

The heat exchange medium flowing from the inlet 4 enters the enlarged tank 13a through the inflow passage 28 and the communication pipe 30, and is dispersed throughout the first tank block α. It flows along the partition wall 11 through the heat exchange medium passage 14 of the tube element corresponding to α (first pass). Then, it makes a U-turn above the partition 11 and descends (second pass) to reach the tank group on the opposite side (third tank block γ). Then, the third tank block γ
Move along the remaining tube elements, and flow through the heat exchange medium passages 14 of the remaining tube elements along the partition 11 (third pass). And the partition 11
Is made a U-turn and descends (fourth pass), guided to the tank 13 constituting the second tank block β, and then flows out of the outflow hole 5 through the outflow passage 29. For this reason, the heat of the heat exchange medium is transferred to the fins 2 in the process of flowing through the heat exchange medium passages 14 forming the first to fourth paths.
And heat is exchanged with air passing between the fins 2.

The entrance / exit passage plate 24 has a first overhanging portion 25 and a second overhanging portion 26 formed by press working as described above. Among them, one having a brazing material clad on only one side surface is used, and is press-formed so that the central side surface (outer side surface) of the anti-lamination type heat exchanger is not clad. The annular protrusions 27a and 27b formed at the outflow ports 4 and 5 are formed by burring from the surface where the brazing material is clad to the surface where the brazing material is not clad. As a result, the inlet / outlet passage plate 24 is formed by cladding the brazing material only on the central side surface (inner side surface) of the stacked heat exchanger, and at the same time, the inner peripheral surfaces of the annular protrusions 27a and 27b of the outflow / inflow ports 4 and 5 are reduced. As shown in FIG. 7B, the brazing material is clad.

The joint 31 joined to the entrance / exit passage plate 24 is connected to the inflow port 4 of the entrance / exit passage plate 24.
And a through hole 33 communicating with the outflow port 5 of the entrance / exit passage plate 24, and annular protrusions formed at the outflow entrances 4 and 5 of the entrance / exit passage plate 24 from the periphery of the through holes 32 and 33. The annular projections 34 and 35 having a diameter that can be inserted into the portions 27a and 27b
33 are formed in the axial direction.

However, as shown in FIGS. 1 and 2,
The tube elements 3, 3a, 3b, 3c, 3d are appropriately laminated in a plurality of stages with the fins 2 interposed therebetween, and the flat plate 16 and the entrance / exit passage plate 24 are sequentially arranged on one side in the laminating direction. After the projections 34, 35 of the joint 31 are inserted (inner-fitted) into the annular projections 27a, 27b, an assembly is formed, and then fixed with a jig (not shown), and brazed in a furnace in this state. In this case, the projections 34 and 35 of the joint 31 are brazed to the annular projections 27a and 27b and the joint 31 by a brazing material clad on the inner peripheral surfaces of the annular projections 27a and 27b. Therefore, the joint 31 is connected to the annular protrusions 27a, 27
There is no need to braze the torch to 7b.

Further, since the brazing material is not clad on the central side surface of the anti-lamination type heat exchanger of the entrance / exit passage plate 24, the jig abuts on the first overhanging portion 25 and the second overhanging portion 26. Even when brazing in a furnace after fixing the assembly of the heat exchanger, the jig is not brazed to the inlet / outlet passage plate 24.

In FIGS. 1 to 7, the configuration of the stacked heat exchanger according to the present invention has been described on the assumption that the inlet / outlet passage plate 24 is disposed at one end in the stacking direction, but is not necessarily limited to this. Not outflow entrance 4,5
If it is not necessary to provide the upper and lower sides of the side plate, the entrance / exit passage plate 24 is of course unnecessary, and the flat plate 1
6 may be provided with outflow ports 4 ', 5'.

One example is shown in FIG. FIG.
The flat plate 16 located at the end in the stacking direction shown in FIG.
A brazing material is clad only on the central side surface (inner side surface) of the stacked heat exchanger, and an inlet 4 ′ and an outlet 5 ′ are formed below. Annular projections 27a, 27b are formed at the outflow ports 4 ', 5' by burring.
The annular projections 27a and 27b have an inner diameter substantially equal to the outer diameter of the projection so that an annular projection of a joint described later can be inserted.

The joint 31 has a through-hole 32 and a through-hole 33, and the through-holes 32, 33 are formed with annular projections 34, 35 as in the above embodiment. The protrusion 34 has an outer surface in contact with the inner surface of the inflow port 4 ′ and an inner surface in contact with a side surface of the communication pipe 30. Further, the protrusion 35 is in contact with the inner surface of the outlet 5 ′ on the outer surface. A brazing material (30a) is clad on the outer side surface of the communication pipe 30.

However, with the annular projections 34, 35 of the through holes 32, 33 of the joint 31 inserted into the inflow port 4 ', outflow port 5' of the flat plate 16, the assembled heat exchanger is placed in a furnace. When brazing, the inlet 4 'and the outlet 5'
The joint 31 is brazed by the brazing material 27a, 27b on the inner surface of the joint and the brazing material 30a on the outer side of the communication pipe 30. On the other hand, since the brazing material is not clad on the central side surface of the anti-lamination type heat exchanger of the flat plate 16, the jig can be prevented from being brazed to the flat plate 16.
The flat plate 16 is generally a flat plate, and its name is not limited, and the flat plate 16 includes an end plate.

Further, the configuration of the evaporator 1 is shown in FIG.
As shown in FIG. 2, it is not limited to the one using the communication pipe 30, and is not limited to the one-tank type. good. An example of the evaporator 1 will be described with reference to FIG.

Among them, the evaporator 1 shown in FIG. 9A is composed of a pair of tanks having holes formed on the side surfaces and a U-shaped heat exchange medium passage communicating between the tanks, although not shown. The two tank groups 4 extending in the stacking direction by stacking only the
The tank group 40 is connected to the inlet 42 at one end in the stacking direction, and the tank group 41 is connected to the inflow port 42 at one end in the stacking direction. One end is connected to the outlet 43.

As a result, as shown by the arrow in FIG. 9A, the heat exchange medium flowing from the inflow port 42 flows through the holes of the tank in the laminating direction and passes through the heat exchange medium passage to the opposite side. After flowing into the tank, it flows through the hole of the tank in the stacking direction in the opposite direction to the previous case, and flows out from the outlet 43.

The evaporator 1 shown in FIG.
Although not shown, two linear heat exchange medium passages communicating between a pair of independent tanks at both ends in the longitudinal direction of the tube element and tanks at both ends in the longitudinal direction of the tube element are provided near the outlets 42 and 43. Are laminated. Further, tanks are formed at both ends in the longitudinal direction of the tube element farther from the outlets 42 and 43, and having two linear heat exchange medium passages communicating between the tanks at both ends in the longitudinal direction requires the outlet inlet. Although it is not different from the one close to the side, the tanks at one end are independent, while the tanks at the other end are formed by stacking tube elements having a configuration communicating with each other in the ventilation direction. This allows
This evaporator has tank groups 44 and 45 on one side in the longitudinal direction of the tube element, and has tank groups 46 and 47 on the other end. The tank group 44 is connected to the inflow port 42 at one end in the stacking direction and is divided into 44a and 44b by a blind plate 48 in the middle thereof, whereas the tank 45 is It is connected to the outlet 43 at one side end and is divided into 45a and 45b by a blind plate 48 in the middle thereof. The tank groups 46 and 47 are all connected by holes formed in the sides of the tank.

Thus, as shown by the arrow in FIG. 9B, the heat exchange medium flowing into the tank group 44a from the inflow port 42 flows into the tank group 46 through the heat exchange medium passage, and this tank The group 46 flows in the stacking direction through the hole of the tank, and further flows into the tank group 44b through the heat exchange medium passage, and then moves to the tank group 45a, where the tank group 45a is moved.
a, flows into the tank group 47 through the heat exchange medium passage,
While flowing through the tank group 47 in the stacking direction in the opposite direction, it flows through the heat exchange medium passage to the tank group 45b,
It flows out from the outlet 43.

In the case of the evaporator 1 having the structure shown in FIGS. 9A and 9B, the outflow ports 42, 4
As shown in FIG. 10, 3 is formed on the flat plate 48 side of the tube element 50 in which the forming plate 48 and the flat plate 49 are joined so as to communicate with the tanks 51 and 52. In this case, However, it is assumed that the brazing material 53 is clad on the central side surface of the stacked plate heat exchanger of the flat plate 48, and the projecting portions 54, 55 projecting from the central side surface of the anti-stacked heat exchanger are formed at the outlets 42, 43. By doing so, the same operation and effect as in the previous embodiments can be obtained when brazing the joint 56. Also, what is referred to as the flat plate 48 is generally a flat plate, and its name is not limited, and includes what is referred to as an end plate.

[0033]

As described above, according to the present invention, the brazing material is clad only on the central side surface of the laminated heat exchanger of the plate disposed at one end in the laminating direction. By inserting the projection of the joint, the brazing material of the annular projection and the inner surface of the joint and the projection of the joint are brazed by furnace brazing, so that the torch brazing becomes unnecessary, The risk of the jig being brazed to the plate during the furnace brazing can also be eliminated.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration example of a laminated heat exchanger according to the present invention.

2 (a) is a view of the stacked heat exchanger of FIG. 1 viewed from below, and FIG. 2 (b) is a view of the stacked heat exchanger of FIG. 1 viewed from the side. It is.

FIG. 3 is a diagram showing a configuration of a forming plate constituting a tube element.

FIG. 4 shows a configuration of a flat plate, and FIG.
Is a front view thereof, and FIG. 4B is a side view thereof.

5 shows a configuration of an entrance / exit passage plate joined to a flat plate, FIG. 5 (a) is a rear view thereof, and FIG.
(B) is a side view thereof.

FIG. 6 is a view showing a joining procedure of a joint, an entrance / exit passage plate, and a flat plate.

7A is a cross-sectional view showing a state in which a joint is joined to an entrance / exit passage plate, and FIG. 7B is a sectional view of FIG.
It is a principal part enlarged view of (a).

FIG. 8A is a cross-sectional view showing a state in which a joint is directly joined to a flat plate, and FIG.
It is a principal part enlarged view of (a).

FIG. 9A is a diagram showing a flow of a heat exchange medium of a single-tank type heat exchanger having a configuration different from that of the previous embodiment, and FIG. It is a figure showing a flow of a heat exchange medium of an exchanger.

FIG. 10 is a sectional view showing a state in which a joint is directly joined to a flat plate in the heat exchanger shown in FIGS. 9 (a) and (b).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Evaporator (laminated heat exchanger) 2 Fin 3 Tube element 3a Tube element 3b Tube element 3c Tube element 3d Tube element 4 Inflow 5 Outflow 4 'Inflow 5' Outflow 16 Flat plate 24 Inlet passage plate 27a Annular protrusion Part 27b Annular protrusion 31 Joint 32 Through hole 33 Through hole 34 Projection 35 Projection 42 Inflow 43 Outflow 54 Projection 55 Projection

Claims (3)

[Claims] A tube element is laminated in a plurality of stages with fins interposed therebetween, a plate having an outflow port formed at one end in a laminating direction is arranged, and a joint having a through hole in the plate is formed by the through hole. In the stacked heat exchanger joined so as to communicate with the outlet, the plate has a brazing material clad on the central side surface of the stacked heat exchanger, and has an anti-stacked heat exchanger at the outlet of the plate. An annular projection protruding from a central side surface of the vessel; and a joint formed with an annular projection in the axial direction of the through hole. Exchanger. 2. The stacked heat exchanger according to claim 1, wherein the plate is an entrance / exit passage plate. 3. The stacked heat exchanger according to claim 1, wherein the plate is a flat plate.