JPS63169497A - Heat exchanger - Google Patents

Abstract

PURPOSE:To increase a connecting area for constituting a header part and prevent the header part from leakage, generated at the connecting part, by a method wherein a multitude of tubes is arranged in parallel and expanded parts, formed at one end of respective tubes, are fitted into a header plate having U-shape section substantially while both of the tubes and the header plate are connected by brazing to constitute the header part. CONSTITUTION:Tubes 11, 11 are arranged in parallel so that both side surfaces of expanded parts 11c, 11c at both ends of the tubes 11, 11 are neighbored while corrugate fins 12, equipped with loubers, are interposed between flat tube parts 11a, 11a. The expanded parts 11c, 11c at both ends of the tubes 11, 11 are fitted into a header plate 13 until the opening end faces thereof are abutted against the bottom wall 13a of the header plate 13. A T-shape projecting piece 16d is fitted into the notch 18 of the header plate 13 and is bent to secure it. All of the parts are brazed by brazing to fix and integrate them.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a horizontally laminated type or vertically laminated type heat exchanger used in automobile radiators, car cooler condensers, and the like.

Note that in the following, the term aluminum is used to include aluminum alloys.

BACKGROUND OF THE INVENTION A typical conventional heat exchanger of this kind, for example, a radiator for an automobile, has a plurality of flat tubes (1) for circulating a heat exchange medium, as shown in FIGS. 10 and 11.
(1) ... are arranged in parallel, and both ends of each tube (1) are connected to upper and lower tank sections (
2) connected to (2) respectively, the heat exchange medium flowing through the tubes (1) and the air flow gap (4) comprising fins (3) arranged between the adjacent tubes (1) (1); Some are known that perform heat exchange with air.

In such a radiator, as shown in FIG. 11, a tank part (2) serving as a header part has a boat-shaped tank cover plate (5) made of synthetic resin or molded aluminum, and a header plate. (6) are connected by fitting through an O-ring (7) if the tank cover plate (2) is made of synthetic resin, or by brazing if the tank cover plate (2) is made of aluminum.

On the other hand, the tank part (2) (2) and the tube (1) (1)
For connection of..., as shown in Fig. 12, burring parts (6a) (6a)... are provided in advance on the header plate (6), and each burring part (6a) is connected before forming the tank part (2). The end of the tube (1) is inserted into 6a), and the inserted end is joined by expanding, brazing, welding, etc. (8) is an entry/exit lever, (9) is a filler neck, and (10) is a side plate.

Problems to be Solved by the Invention Therefore, in the conventional radiator described above, the number of parts that make up the tank part (2) is large, parts management is troublesome and costs are high, and the burring of the header plate (6) is difficult. It takes a lot of time and effort to manufacture, as there are many man-hours involved in forming the section (6a), joining it with the tube (1), and assembling the tank section (2). There were problems in that bonding defects were likely to occur and leakage was likely to occur.

Means for Solving the Problems This invention has been made to solve the above-mentioned conventional problems.It has a small number of parts, is structurally simple, can be manufactured easily at low cost, and can be easily manufactured at each joint. The object of the present invention is to provide a heat exchanger that has high conversion properties and is less likely to cause leakage of the heat exchange medium.

That is, in order to achieve the above object, the heat exchanger according to the present invention includes a pair of headers arranged in parallel, and a large number of headers arranged in parallel between both headers and connected at both ends to each header. In a heat exchanger comprising tubes and fins disposed in air circulation gaps between adjacent tubes, each of the tubes has enlarged tube portions with a rectangular cross section at both ends of the flat tube portion, and all tubes have enlarged tube portions at both ends. The expanded tube portions are arranged such that their sides are in close contact with each other, and the entire expanded tube portions arranged in close contact are fitted into the opening of a header plate having an approximately U-shaped or U-shaped cross section with one side open, and the upper and lower surfaces of these expanded tube portions are The header portion is characterized in that the header portion is formed by brazing and joining the inner surface of the header plate and the inner surface of the header plate at their overlapping portions.

Example The present invention will be explained below based on illustrated embodiments.

Figures 1 to 5 show an automobile radiator to which the present invention is applied, in which (11) is a tube, (12) is a louvre fin, (13) is a hender plate, (14) is an entry/exit lever, and (15) is a radiator for an automobile to which the present invention is applied. ) is a filler neck, and (16) is a side plate, both of which are made of aluminum moldings.

The tube (11) is made of a flat electric resistance welded tube made of a plating sheet, and as shown in FIGS. 2 and 3, the flat tube portion (11a) has tapered transition portions (1
1b), an enlarged tube portion (11C) having a rectangular cross section is formed. In addition, through holes (17) are formed on both sides of the expanded tube portion (11c), that is, on both sides of the short side.

In addition, as shown in Fig. 4, the header plate (13)
is formed by press molding into a U-shaped cross section, and has notches (18) at both ends of its bottom wall (13a), and both side walls (13b) at one end.
A pipe attachment part (13c) is formed which bulges out in a semicircle rearward from the bottom wall part (13a) and has the same thickness as the gap, and a circular opening (19) is provided on one side of the pipe attachment part.

Furthermore, the side plate (16) is formed by press molding.
The intermediate main portion (16a) is formed to have a U-shaped cross section that is open outward, and has tapered portions (16b) at both ends that are inclined inward at the same angle as the side surfaces of the tapered transition portion (11b) of the tube (11). ), and a mounting portion (16c) having an outwardly open U-shaped cross section and narrower than the intermediate main portion (16a).
is formed, and a T-shaped protrusion (16d) is integrally formed from the end surface of the attachment portion (16c).

Therefore, in order to manufacture a heat exchanger, first, as shown in Fig. 4, the tubes (11) (11)... are connected so that both sides of the tube expansion parts (11c) (11 (11c)) are adjacent to each other. The tubes (11) (11) are arranged in parallel in close contact with each other, and the adjacent tubes (11)
) (11) Flat tube part (11a) (11(11a
) A corrugated fin (12) with a louver is interposed between the two. Here, tube < 11) (11)...
- Of these, three on both sides have a semicircular notch (20) formed on the upper surface of the expanded tube part (Ilc) so that it can fit into the outer peripheral surface of the inlet/outlet lobe (14),
In addition, as the tubes (11) located at the outermost positions on both sides, there is used a tube that does not have a through hole (17) on one side (outer side) of the expanded tube portion (11c).

Next, as shown in FIG. 5, the expanded tube portions (1
1c) (11 (11c)... respectively, header play) (13) with its open end surface inside the bottom wall part
a) until it makes contact with the mounting portions (16c) (16) of both side plates (16) (16).
c) into the header plate (13) from both sides,
The T-shaped protrusion (16d) is attached to the header plate (13).
It is fixed by fitting into the notch (18) and bending. Furthermore, the entry/exit lobe (14) (14) is fitted into the pipe attachment part (13C) of the header plate (13) and locked at the flange part (14a),
The filler neck (15) is fitted into a mounting portion (not shown) of the header plate (13), and finally the entire assembly is brazed and joined by brazing to be fixed and integrated.

Note that this brazing can be performed all at once by forming the tube (11) and each necessary part with a plating sheet, or by assembling the tube (11) and other necessary parts with a separate plating sheet interposed between the joint parts. Due to the above-mentioned breathing, the expanded portion (11) of the tube (11)
C), the upper and lower surfaces of the expanded pipe section (11C'J), and both side wall pleatings (13) of the header plate (13).
b') (13b), and between the inner surfaces of both side wall breathing parts (13b) and the outer surfaces of both side pieces of the mounting portion (16c) of the side plate (16), respectively. The expansion part (11C) is sealed at the inner position of (13)
(11c)... are communicated through the through hole (17) to form a part of the heng (21). However, the tube (
The width l of the long side of the expanded tube portion (llc) in 11) is the tube pitch Tp.

It is desirable that the fin height FH be slightly larger, for example, by about 0.05fi, than the length obtained by subtracting the thickness t of the flat tube portion (11a) of the tube (11) from the tube pitch Tp. It is possible to prevent the tube from falling off when it is assembled between the tubes (11).

In other words, it is preferable to set F H-Tp- to about 0.05W.

In the radiator having the above configuration, since the joint area at the joint between the header plate (13) and the tube (11) is large, there is very little chance of a joint failure occurring, and leakage is almost completely prevented. Also, by installing the side plates (16) (16), the tube (1
1) Expanded tube part (11c) of (11) (1
1c)... Mutual adhesion is improved, and opening of both ends of the header plate (13) is prevented, ensuring sealing of the header parts (21) (21). Therefore, by combining tubes (11) having through holes (17) on both sides and tubes having holes (17) only on one side in the expanded tube portion (11c), a radiator or condenser with an arbitrary number of passes can be constructed.

In addition, in this invention, the tube (11) is an expanded tube part (
It is also possible to construct the header section <21) (21) using one in which the through hole (17) is not provided in the header section (21). Figures 6 and 7 show examples of this, where the header plate (13) has both side walls (13b) (13b).
The distal end side of the tube (11) (13d) is bent into an L-shape and has a pair of connecting pieces (13d) (13d) with a narrow opposing distance.
1) Expanded tube part (11c) without through hole (11
c)... is inserted, so each expanded tube part (
A space (21a) that continues in the longitudinal direction of the header plate (13) is formed between the open end of the header plate (11c) and the bottom wall (13a) of the header plate (13), and this space has a header plate (21a) at both ends. Attachment part (16e) of side plate (16) fitted to both ends of (13)
A header portion (21) is configured by being sealed with.

Further, the present invention can be applied to various heat exchangers such as radiators for car coolers in addition to the exemplified condensers for automobiles, and the detailed structure of each component can be modified in various designs.

For example, the bracket (22a) of the radiator shown in FIG.
<22 b), it is possible to braze and secure accessories such as brackets for installation and fixation at required locations by bulk brazing as necessary. In addition, in Fig. 8, the entrance/exit lever (14) (14) is connected to the union (23).
) to one end of each header part (21).

Furthermore, as shown in FIG.
3) may be performed by separately interposing a plating sheet (25) (25) between the contact surfaces of the two. In this case, the tube (11) may be made of aluminum extraction material. Also, the adjacent tube (11)
In order to ensure the sealing performance between the expanded tube portions (11c) (11c) of (11), the tapered transition portion (11c)
1b) (11b) may be filled with a sealing part (26) made of epoxy resin or the like, or alternatively, a piece of plating sheet may be placed between the expanded pipe parts (11b) (11b) to seal them together. Direct brazing may be used; however, in the embodiment shown in FIG. 9, the fins are formed by cut material fins (12a) cut and raised from the side surface of the tube (11).

Effects of the Invention The heat exchanger according to the present invention has a large number of tubes arranged in parallel with each other in such a manner that the side surfaces of the enlarged tube sections having a rectangular cross section formed at both ends are in close contact with each other, and the whole of the expanded tube sections arranged in close contact with each other. into a header plate with a roughly U-shaped cross section,
Since the header section is constructed by brazing and joining the upper and lower surfaces of these tube expansion sections and the overlapping part with the inner surface of the header plate, a large joint area can be taken for configuring the header section, and there is no need to worry about joint failures. Leakage at the header part is reliably prevented, excellent reliability is achieved, the number of parts used to form the header part is smaller than that of conventional configurations, and the parts and the whole structure are planar. Since manufacturing, especially assembly of the heat exchange core part, is very easy, manufacturing costs and material costs are significantly reduced, and manufacturing time can also be shortened.

[Brief explanation of the drawing]

Fig. 1 is a front view of the entire heat exchanger according to the first embodiment of the present invention, Fig. 2 is a perspective view of main parts of a tube used in the same embodiment, and Fig. 3 (A) is a plan view of the tube. Figure 3 (B
) is the same side view, FIG. 4 is an exploded perspective view of the main parts showing the assembly operation of each part of the heat exchanger of the same example, FIG. 5 is a perspective view of the main parts after assembly, and FIG. The figure is a front view of a heat exchanger according to a second embodiment of the present invention, FIG. 7 is a perspective view of essential parts in the same embodiment, and FIG. 8 is a schematic diagram of a heat exchanger according to a third embodiment of the present invention. 9 is a perspective view of essential parts of a fourth embodiment of the present invention, FIG. 10 is a front view of a conventional heat exchanger, and FIG. 11 is a front view of a conventional heat exchanger.
The figure is an exploded front view of the heat exchanger, and FIG. 12 is an exploded perspective view of the main parts showing the connection between the header plate and the tube of the heat exchanger. (11)...Tube, (lla)...Flat tube part,
(11c)...Pipe expansion part, (12)...Louver fin (fin), (13)...Header plate, (2
1)...Header section. Above Figure 6 Figure 7 Figure 12

Claims (1)

[Claims] (1) A pair of headers arranged in parallel, a number of tubes arranged in parallel between both headers and connected to each header at both ends, and fins arranged in the air circulation gap between adjacent tubes. A heat exchanger comprising:
Each of the above-mentioned tubes has an enlarged tube part with a rectangular cross section at both ends of the flat tube part, and all the tubes are arranged so that the sides of the enlarged tube parts at both ends are in close contact with each other between adjacent tubes, and the entire expanded tube part arranged in close contact with each other is The header part is fitted into the opening of a header plate having a generally U-shaped or U-shaped cross section with one side open, and is joined by brazing at the overlapping part of the upper and lower surfaces of these tube expansion parts and the inner surface of the header plate. A heat exchanger comprising: