JP2864170B2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger mainly used for a vehicle air conditioner.

[0002]

2. Description of the Related Art In recent years, a structure in which a tank is provided separately from a tube element has been developed in order to reduce the size of the tank.
No. 62 discloses this.

In this prior art, an end plate is inserted into the entrance and exit of a laminated tube element, and the end of a connecting portion of a tank consisting of an inlet tank and an outlet tank is inserted into a recess provided in the end plate. The tank was connected to the end plate.

[0004]

However, in the prior art described above, the leading end of the connecting portion of the tank is inserted into the recess of the end plate. At the time of the insertion, the joining surface of the inlet tank and the outlet tank which forms the partition of the tank is inserted. In some cases, the tip of the connection part on the side becomes unbalanced depending on the way of pushing, and one pushes out the other, and the pushed-out side may be raised. When brazing is performed in this state, the other end of the pushed out connection portion is not brazed to the end plate, so that the partition is not properly formed, and there is a problem that a bypass leak occurs in the tank. .

Further, since the central concave portion provided in the end plate protrudes toward the tube element side of the heat exchanger, the protruding portion acts as a ventilation resistance, so that even if there is a fin, the fin is not provided. Air does not reach the part,
The heat exchange rate was reduced.

Further, the concave portions at both ends (sides) provided in the end plate are once projected downward and upwardly.
Since it is formed by turning, the upwardly directed side portion protrudes in the width direction of the heat exchanger, which makes the heat exchanger rather large.

Accordingly, the present invention has been made in view of the above problems, and has as its object to provide a heat exchanger capable of preventing bypass leakage of a partition of a tank, improving a heat exchange rate of a heat exchanger, and realizing miniaturization of a tank. With the goal.

[0008]

In order to achieve the above object, a heat exchanger according to the present invention comprises a tube element having a heat exchange medium passage and a corrugated fin alternately stacked in a plurality of stages. In a heat exchanger, the inlet / outlet of the tube element is inserted into an end plate and a tank having an inlet / outlet pipe is connected to the end plate, wherein the tank is constituted by an inlet tank and an outlet tank. And the vicinity of the end of the connecting portion of the outlet tank is bent inward to form a tank-side connecting portion, and the center of the end plate to which the tank is connected and both ends in the longitudinal direction are bent toward the tank. To form an end plate-side connection, and face-to-face the end plate-side connection of the end plate with the tank-side connection of the tank. It is obtained so as to connect with.

[0009]

Therefore, since the end plate-side connection portion of the end plate and the tank-side connection portion of the tank are connected by surface joining, poor connection is reduced, and bypass leakage at the partition portion of the tank is avoided.

Further, since the tank-side connection portion of the tank and the end plate-side connection portion of the end plate are bent inward of the tank, the connection from the end plate to the tube element side and the side of the tank (heat exchange) Nothing protrudes in the width direction of the vessel), thereby improving the heat exchange rate and reducing the size of the tank, thereby solving the above-mentioned problems.

[0011]

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

In FIG. 1, the heat exchanger includes a plurality of tube elements 1 and corrugated fins 2 alternately stacked in a plurality of stages, and an end plate 4 connected to one end of the stacked tube elements 1. The tank 4 having the inlet / outlet pipes 6 and 6 is connected to the plate 4 and assembled.

The tube element 1 is formed by joining two molded plates 10 shown in detail in FIG.

The forming plate 10 has a substantially rectangular shape.
At one end in the longitudinal direction, a pair of entrance / exit forming recesses 12 and 14 serving as an outflow / inflow entrance of the heat exchange medium are formed.
A ridge 16 extends from between the entrance forming recesses 12 and 14 toward the other end, and a substantially U-shaped heat exchange medium communicates with the entrance forming recesses 12 and 14 on the periphery of the projection 16. The passage forming recess 18 is formed to bulge. At the other end of the forming plate 10, a tube element abutting portion 20 is formed so as to protrude outward.

[0015] The molding plate 10 is
The tube element 1 is formed by joining the pieces in the middle of the sheet, and the one side of the tube element 1 is opposed to the recess 1 for forming the entrance and the exit.
A pair of heat exchange medium inlets and outlets 22 and 24 (see FIG. 3) are formed from the heat exchange medium passages 2 and 14, and a substantially U-shaped heat exchange medium passage 26 is formed inside from the opposed heat exchange medium passage forming recess 18. The ports 22 and 24 are configured to communicate with each other via a heat exchange medium passage 26.

As shown in FIG. 1, the tube element 1 having such a structure is stacked in a plurality of stages by abutting the adjacent tube element abutting portions 20, and is defined by the abutting of the tube element abutting portions 20. The fins 2 are inserted and fixed in the spaces between the tube elements and the tube elements at both ends in the stacking direction. As shown in FIG. 3, the entrances 22 and 24 of the stacked tube elements 1 are inserted and connected to tube element insertion holes 4a of the end plate 4 described below.

The end plate 4 has a substantially rectangular shape extending in the direction in which the tube elements 1 are stacked. The end plate 4 is gently moved toward the tank direction at substantially the center and both ends in the longitudinal direction where the tank 8 described below is connected. The end plate side connection portions 28 and 30 are bent in a curved shape, and one end plate side connection portion 28 is formed so as to protrude toward the tank 8 side in a mountain shape, and the other end plate side connection portion. Numerals 30 are bent on both sides of the end plate 4 toward the tank 8, and both extend to both longitudinal ends of the end plate 4. In addition, such an end plate 4
A plurality of tube element insertion holes 4a for inserting the entrances 22 and 24 of the stacked tube elements 1 are provided at predetermined intervals in the stacking direction between the end plate side connection portions 28 and 30.

As shown in FIG. 1 and FIG. 3, the tank 8 has an inlet tank (or outlet tank) 32 and an outlet tank (or inlet tank) 34 having the same shape and open at the bottom and both ends in the longitudinal direction. A partition 35 that partitions the inlet tank 32 and the outlet tank 34 is formed at this joint.

The inlet tank 32 and the outlet tank 34 are provided with an inlet / outlet pipe 6 for a heat exchange medium at a predetermined position, and are connected to the end plate 4 in the vicinity of the connection portion (the periphery of the opening on the bottom side). The side connecting portion 36 is bent inward with a gentle curve, and the tank side connecting portion 36 and the end plate side connecting portions 28 and 30 of the end plate 4 are surface joined as shown in FIG. Is to be connected by

The openings at both ends of the tank 8 are closed by caps 38.
The entrance tank 32 and the exit tank 34 are connected to entrance / exit pipes 6 and 6 at appropriate locations.

In the heat exchanger having the above-described structure, the heat exchange medium flowing into the inlet tank 32 from one of the inlet / outlet pipes 6 flows through the heat exchange medium passage 26 of the laminated tube element 1, during which the outside air and the outside air are exchanged. Between the outlet pipe 34 and the other inlet pipe 6
From the outside.

In this heat exchanger, the end plate-side connection portions 28 and 30 of the end plate 4 and the tank-side connection portion 36 of the tank 8 are connected by surface joining. The brazing at the time of brazing the part and the side of the tank is reliably performed, and the inlet tank 32
Bypass leakage does not occur between the heat exchanger and the outlet tank 34, and the reliability of the heat exchanger can be improved.

Also, since the end plate-side connection portions 28 and 30 of the end plate 4 are bent toward the tank, nothing protrudes from the end plate 4 to the tube element 1 side (core side). The ventilation resistance does not occur in the core portion of the heat exchanger as in the related art, and as a result, the heat exchange rate of the heat exchanger can be improved as compared with the related art.

Further, since the tank-side connecting portion 36 formed near the distal end of the connecting portion of the tank 8 is bent toward the inside of the tank, nothing protrudes from the side of the tank 8, so that the tank is small. Can be achieved.

Further, since the connection between the tank 8 and the end plate 4 is securely performed, the thickness of the partition 35 formed by joining the inlet tank 32 and the outlet tank 34 can be reduced (for example, by cutting). This also makes it possible to reduce the size of the tank.

An example of a method for easily and reliably joining (positioning) the inlet tank 32 and the outlet tank 34 of the tank 8 will be described with reference to FIGS.

In FIG. 4, a predetermined number of fitting protrusions 40 and fitting recesses 42 are provided at predetermined positions on the side surface on the joining side of the inlet tank 32 (outlet tank 34).
And the inlet tank 32 and the outlet tank 3 as shown in FIG.
4 and the fitting projection 40 and the fitting recess 42 facing each other at the time of joining.
And the inlet tank 32 and the outlet tank 3
4 can be joined (positioned). Thereby, the tank 8 can be easily assembled, and the assemblability can be improved.

[0028]

As described above, according to the present invention,
Since the tank and the end plate are connected by surface joining, brazing of the partition portion can be reliably performed, and therefore, leakage of bypass in the partition portion can be prevented.

Further, since the end plate-side connection portion of the end plate is bent toward the tank, no airflow resistance protrudes from the end plate to the core side of the heat exchanger. The heat exchange rate of the heat exchanger can be improved more than before.

Further, since the tank-side connecting portion formed near the distal end of the connecting portion of the tank is bent toward the inside of the tank, nothing protrudes from the side of the tank, so that the size of the tank is reduced. It is possible.

[Brief description of the drawings]

FIG. 1 is a perspective view of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is a perspective view of a forming plate constituting the tube element.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a view showing another embodiment of the inlet tank and the outlet tank.

FIG. 5 is a diagram showing a state where the inlet tank and the outlet tank according to the above are joined together.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tube element 2 Fin 4 End plate 6 Inlet / outlet pipe 8 Tank 10 Molding plate 22, 24 Inlet / outlet 26 Heat exchange medium passage 28, 30 End plate side connection part 32 Inlet tank 34 Outlet tank 35 Partition part 36 Tank side connection part

Claims (1)

(57) [Claims] 1. A tube element having a heat exchange medium passage and corrugated fins are alternately laminated in a plurality of stages,
In a heat exchanger in which the inlet and outlet of the laminated tube element are inserted into an end plate, and a tank having an inlet and outlet pipe is connected to the end plate, the tank is constituted by an inlet tank and an outlet tank. A portion near the end of the connection portion between the inlet tank and the outlet tank is bent inward to form a tank-side connection portion, and the center of the end plate to which the tank is connected and both ends in the longitudinal direction are directed toward the tank. A heat exchanger, wherein the end plate-side connection portion is formed by bending the end plate, and the end plate-side connection portion of the end plate and the tank-side connection portion of the tank are connected by surface joining.