JPH04270895A - Heat exchanger - Google Patents

Abstract

PURPOSE:To provide a heat exchanger capable of brazing integrally with a low cost without using any jig. CONSTITUTION:Inserts 4 are arranged at the outside of fins 3 positioned at the uppermost stage and the lowermost stage of a core while the inserts are provided with projections 4b at both ends of the same. Both ends of respective tubes 2, laminated together with the fins 3, are supported by sheet metalls 5 while both ends of the sheet metals 5 are abutted against the projections 4b of the inserts 4 upon assembling the core whereby the positioning of the sheet metals can be effected.

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 comprising tubes and fins alternately laminated.

0002

2. Description of the Related Art In the case of a heater core of a vehicle heating system, for example, this heat exchanger has a tube 100 serving as a fluid passage and a corrugated fin 100 for heat radiation, as shown in FIG.
The inserts 102 are arranged on the outside of the outermost corrugated fin 101. Both ends of each tube 100 are supported by a sheet metal 103, and a capsule 104 that communicates each tube 100 is provided on the outside thereof, and an inlet pipe 105 or an outlet pipe (not shown) is connected to the capsule 104.
can be installed. The assembled core is fixed by a jig (not shown) until integral brazing is completed in order to maintain its core shape.

0003

[Problems to be Solved by the Invention] However, since a jig is required until the brazing is completed, workability is poor, and the cost is high due to the additional cost of the jig. Therefore, a method has been proposed in which the side brackets placed at both ends of the tube and the side plates placed on the outside of the fins are integrated in a multilayer capacitor, thereby performing brazing without using a jig. (Nippon Denso Technical Report 55-
086).

[0004] However, with this method, it is expensive to manufacture a mold for the integrated side bracket, and the cost advantage of omitting the jig is lost.

The present invention was made based on the above circumstances, and its object is to provide a heat exchanger that can be integrally brazed at low cost without using a jig. .

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a plurality of tubes and corrugated fins that are alternately stacked, and a thin plate is placed outside the outermost corrugated fin. In addition, in the laminated heat exchanger in which both ends of each tube are supported by end plates, the thin plates position the end plates by bringing the ends of the end plates into contact with both ends of the thin plates. The technical means is that the protrusion is integrally provided.

[0007]

[Operations and Effects of the Invention] In the heat exchanger of the present invention constructed as described above, the end plates are positioned by the ends of the end plates coming into contact with the protrusions provided at both ends of the thin plates. In this state, by tightening and fixing the outer periphery of the core with a wire or the like, the core shape can be maintained without using a jig. Therefore, there is no need to use a jig until the brazing is completed. Further, since the protrusion can be formed by, for example, bending a part of the end of the thin plate, mold production of the thin plate is also easy.

[0008] As a result, thin plates or end plates can be processed without significantly changing the conventional manufacturing process, so integral brazing can be performed at low cost and without using jigs. .

[0009]

[Embodiment] Next, the heat exchanger of the present invention will be explained based on an embodiment shown in the drawings. FIG. 1 is a perspective view of the main parts of a heat exchanger. The heat exchanger of this embodiment is, for example, a heater core 1 of a vehicle heating system, which heats air using engine cooling water (hot water) as a heat source.

The heater core 1 is a laminated heat exchanger constructed by alternately laminating tubes 2 through which hot water passes and corrugated fins 3 (hereinafter referred to as fins) for heat dissipation, and is manufactured by integral brazing. be done. Inserts 4 (thin plates of the present invention) are arranged on the outside of the fins 3 located at the top and bottom of the core, and both ends of each tube 2 are supported by sheet metal 5 (end plates of the present invention). ing. A capsule 6 is provided outside the sheet metal 5 to communicate the tubes 2, and an inlet pipe or an outlet pipe (both not shown) is attached to the capsule 6.

The sheet metal 5 is provided with an insertion hole (not shown) into which the end of each tube 2 is inserted.
A burring 5a is formed around this insertion hole in order to improve brazing and assembling properties with the tube 2.

Further, the sheet metal 5 is provided with ribs 5b that are convex toward the fins 3 between the respective insertion holes. This rib 5b has an end portion of the fin 3 formed on the sheet metal 5b.
This prevents the brazing material from coming into contact with the joint (rooting part) of the tube 2 and the tube 2, and thereby prevents the brazing material at the rooting part from being absorbed into the fin 3 during brazing, thereby preventing the occurrence of brazing defects. can be suppressed.

[0013] In order to prevent the fins 3 from absorbing the brazing material at the rooting portion, a distance of about 1 to 2 mm from the rooting portion to the end of the fin 3 is required. Therefore, the ribs 5b provided on the sheet metal 5 have a height of 1 to 2 mm. Note that the ribs 5b described above are not provided at both ends of the sheet metal 5 (portions corresponding to the uppermost and lowermost fins 3 of the core).

As shown in FIG. 2 (plan view of the insert 4), the insert 4 is formed with reinforcing ribs 4a in the longitudinal direction, and has protrusions 4 at both longitudinal ends.
b is provided. This protrusion 4b is used to position the sheet metal 5 when assembling the core, and is shown in FIG.
As shown in (A-A sectional view in Figure 2), the insert 4
It is formed by bending the end of the

Further, the projections 4b function as fin stops by abutting the ends of the fins 3 located at the top and bottom stages of the core, and also function as fin stops at both ends of the sheet metal 5 where the ribs 5b are not provided. In this case, it also functions as a spacer to maintain the distance between the rooting part and the end of the fin 3, and can prevent the brazing material in the rooting part from being absorbed by the fin 3. In addition, the plate thickness of the insert 4 is 1.0 ~
Approximately 1.6 mm (that is, the plate thickness of the protrusion 4b is 1.0 mm)
~1.6 mm).

[0016] Here, a method for manufacturing the heater core 1 will be briefly explained. First, tubes 2 and fins 3 are alternately stacked, and inserts 4 are provided on the outsides of the fins 3 arranged at the top and bottom stages. Next, both ends of each tube 2 are inserted into the insertion holes of the sheet metal 5, and the sheet metal 5 is attached. At this time, the sheet metal 5 is positioned by having both ends thereof abut against the projections 4b of the insert 4.

After that, the outer periphery of the core is tightened with a wire (not shown) to maintain the core shape, and after the capsule 6 to which the inlet pipe or outlet pipe is attached is assembled, integral brazing is performed to braze each joint. Attach and join.

In this way, in this embodiment, the insert 4
Since the sheet metal 5 can be positioned by the protrusion 4b provided in the holder, there is no need to use a jig until the brazing is completed during integral brazing. Further, the protrusion 4b provided on the insert 4 can be formed by simply bending the end of the insert 4, and integral brazing can be performed at low cost without requiring any significant improvement in the manufacturing process.

Furthermore, the protrusion 4b of the insert 4 is
By functioning as a spacer that maintains the distance between the rooting part and the fin 3, the ribs 5b at both ends of the sheet metal 5 can be eliminated, allowing flexibility in the shape of both ends of the sheet metal 5. It is possible to suppress the occurrence of cracks at the bent portions of the ends of the sheet metal 5, etc.

In this embodiment, the sheet metal 5 is provided with the burrings 5a and ribs 5b, but as shown in FIG.
You may also use Alternatively, as shown in FIG. 5, only the burring 5a may be provided. However, in these cases, there is a possibility that the fins 3 absorb the brazing material at the rooting portion.

Therefore, when the ribs 5b are not provided on the sheet metal 5 as described above, for example, as shown in FIG. It may also be possible to prevent the filler metal from absorbing the filler metal.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts of a heat exchanger.

FIG. 2 is a plan view of the insert.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a sectional view showing a modified example of sheet metal.

FIG. 5 is a sectional view showing a modified example of sheet metal.

FIG. 6 is a sectional view showing a modified example of the fin.

FIG. 7 is a sectional view of a heater core according to the prior art.

[Explanation of symbols]

1 Heater core (heat exchanger) 2 Tube 3 Corrugated fin 4 Insert (thin plate) 4b Protrusion 5 Sheet metal (end plate)

Claims (1)

[Claims] 1. A laminated structure in which a plurality of tubes and corrugated fins are alternately laminated, a thin plate is placed outside the outermost corrugated fin, and both ends of each tube are supported by end plates. type heat exchanger, characterized in that the thin plate is integrally provided with protrusions on both ends thereof, which position the end plate by abutting the ends of the end plate. .