JP2004116912A - Tank-less heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger dispensing with a tank in order to reduce the number of part items and improve the reliability of brazing. <P>SOLUTION: This tank-less heat exchanger composes a tube assembly part 4 formed in a square sectional circumference as the whole by curving both ends of flat tubes 1 in the thickness direction on the outside of a core 3 and overlapping and closely fitting their flat surfaces. The ends of the tube assembly part 4 are liquid-tightly adhered and fixed to the openings 9 of piping bosses 5. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heat exchanger having a large number of flat tubes and fins, and relates to a tankless heat exchanger that does not require a tank.
[0002]
[Prior art]
As shown in FIG. 3, for example, an oil cooler, a radiator for cooling engine cooling water, or a condenser for air conditioning and other heat exchangers are composed of a number of flat tubes 1 and fins 2 arranged between the flat tubes 1. Form 3 Then, both ends of each flat tube 1 are inserted into the flat holes of the tube plate 11, and the tube plates 11 are fitted into the openings of the tank body 10. Further, the piping boss 5 is arranged at the end of the tank body 10 to assemble the whole and braze and fix the components integrally.
[0003]
[Problems to be solved by the invention]
A conventional heat exchanger having a tank has many brazing points, which may cause leakage due to poor brazing at each part of the tank, has a large number of parts, and is cumbersome to assemble.
Therefore, an object of the present invention is to provide a heat exchanger that does not require a tank in order to reduce the number of parts and improve the reliability of brazing.
[0004]
[Means for Solving the Problems]
According to the present invention, a core (3) is formed by a number of flat tubes (1) and a number of fins (2) interposed between the adjacent flat tubes (1),
At the outside of the core (3), both ends of each flat tube (1) are curved in the thickness direction, and their flat surfaces are overlapped and adhered to each other, so that the tube cross section is formed so that the outer periphery of the whole is square. A tankless heat exchanger in which the end of the tube assembly (4) is liquid-tightly joined and fixed to a piping boss (5) having an opening (9) aligned with its outer periphery. is there.
[0005]
The present invention described in claim 2 is based on claim 1,
This is a tankless heat exchanger in which each flat tube (1) is supported by a pair of side members (6) at both ends of the core (3).
The present invention described in claim 3 is the invention according to claim 2,
A pair of support members (7) are arranged on both sides of the core (3) in the parallel direction of the flat tubes (1), and both ends of the pair of side members (6) are fixed to both ends of the support (7). Tankless heat exchanger.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of the tankless heat exchanger of the present invention, and FIG. 2 is a sectional view taken along the line II-II of FIG.
In this heat exchanger, a core 3 is formed by a number of parallel flat tubes 1 and corrugated fins 2 sandwiched between the flat tubes 1. A pair of support members 7 are arranged above and below the core 3, and a pair of side members 6 are arranged on the left and right sides of the core 3. Each flat tube 1 is inserted through a flat hole (not shown) formed in the side member 6, and both upper and lower ends of the side member 6 are connected to the support member 7.
[0007]
On each side of the core 3, each flat tube 1 is curved in its thickness direction, its planes are overlapped and adhered to each other, and the entire cross-sectional outer periphery is formed in a square shape (FIG. 2) to form a tube assembly portion 4. Then, the end of the tube assembly 4 is fitted into the opening 9 of the piping boss 5 aligned with the outer periphery.
While being assembled in this manner, at least one of the parts that are in contact with each other is coated or brazed with a brazing material, the whole is inserted into a high-temperature furnace, the brazing material is melted, and then cooled and solidified. By doing so, the components can be integrally brazed and fixed. The end of the tube assembly 4 and the opening 9 of the piping boss 5 can be separately brazed after brazing other components.
Each of the piping bosses 5 has an entrance 8 to which an entrance piping (not shown) is connected.
[0008]
This heat exchanger is used for an oil cooler, a condenser for air conditioning, a heat exchanger for cooling engine cooling water, and the like.
At this time, a fan (not shown) is attached to face the plane of the core 3, and cooling air is generated on the outer surface side of the flat tube 1 and the fin 2 side. The fluid to be cooled flows in from one pipe boss 5, flows through each flat tube 1, and flows out from the other pipe boss 5. Heat is exchanged between them.
In the above embodiment, the fins 2 are of the corrugated type, but plate-type fins may be provided instead.
[0009]
[Action and Effect of the Invention]
In the tankless heat exchanger of the present invention, both ends of a large number of flat tubes 1 are curved in the thickness direction, and their flat surfaces are overlapped with each other to form a tube assembly 4. Then, the end of the tube assembly 4 is liquid-tightly joined and fixed to the opening 9 of the piping boss 5 aligned with the end. Therefore, the number of parts can be extremely reduced, and a highly reliable heat exchanger which does not require the conventional tank and its brazing portion can be provided at low cost.
In addition, the curved portions of the respective flat tubes 1 on both sides of the core 3 form heat transfer surfaces, so that the heat exchange performance is good.
[0010]
In the above configuration, each flat tube 1 can be supported by the pair of side members 6 at both ends of the core 3. Thereby, a tankless heat exchanger which is strong and hard to deform can be obtained.
In the above configuration, a pair of support members 7 can be further disposed on both sides of the core 3 in the parallel direction of the flat tubes 1, and both ends of the side member 6 can be fixed to both ends of the support member 7. This can result in a more robust heat exchanger.
[Brief description of the drawings]
FIG. 1 is a front view of a tankless heat exchanger of the present invention.
FIG. 2 is a sectional view taken along the line II-II of FIG.
FIG. 3 is a schematic view of a main part of a conventional heat exchanger.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flat tube 2 Fin 3 Core 4 Tube collecting part 5 Piping boss 6 Side material 7 Support material 8 Door opening 9 Opening 10 Tank body 11 Tube plate

Claims (3)

A core (3) is formed by a number of flat tubes (1) and a number of fins (2) interposed between adjacent flat tubes (1).
At the outside of the core (3), both ends of each flat tube (1) are curved in the thickness direction, and their flat surfaces are overlapped and adhered to each other, so that the tube cross section is formed so that the outer periphery of the whole is square. (4) A tankless heat exchanger in which an end of the tube assembly (4) is liquid-tightly joined and fixed to a piping boss (5) having an opening (9) aligned with its outer periphery. In claim 1,
A tankless heat exchanger in which each flat tube (1) is supported by a pair of side members (6) at both ends of the core (3). In claim 2,
A pair of support members (7) are arranged on both sides of the core (3) in the parallel direction of the flat tubes (1), and both ends of the pair of side members (6) are fixed to both ends of the support (7). Tankless heat exchanger.

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