JPS5924780B2 - radiator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a radiator having horizontal flat tubes connected to each other by vertical collecting tubes for the front and rear channels.

Various designs are known for this type of heat sink.

In the case of most known heat sinks, there are either vertical collecting tubes or horizontal heat dissipating tubes at both ends, all of which flow into these collecting tubes.

The collecting tube must therefore have a relatively large flow cross section.

Flat tubes are especially used for aesthetic reasons for heat dissipation tubes,
Therefore, when choosing the symmetrical arrangement that should be the easiest to manufacture,
Vertical collecting tubes present at both ends thereof project forward and backward from both ends of the flat tube due to their relatively large dimensions.

Therefore, for aesthetic reasons, heatsinks are made with the collection tube offset relative to the rear face in order to ensure that the front face of the heatsink is completely flat.

However, this structure requires a lot of expense in welding the flat tube to the collection tube.

In that case, in order to weld the flat tubes all together to the collection tube, the flat tubes naturally need to lie directly above and below.

This is because, if the individual flat tubes are to be placed one above the other with separation, it is necessary to weld the collection tube closely between the individual flat tubes at the welding point.

However, the spacing between the individual flat tubes is advantageous because of the air circulation possible in such an arrangement.
This is because a relatively large heat transfer capacity is obtained between the flat tube and the tube which is not in contact with itself.

Also in the case of other known constructions with internal, interconnected flat tubes, these tubes lie directly one above the other.

In all hitherto known constructions of radiators of this type, efforts are made to harmonize aesthetic considerations with manufacturing technical considerations, so that the radiator can be produced as cost-effectively as possible and is pleasing in its external form. It has been made.

The goal of this effort is a heat dissipation tube with a collecting tube located on the rear side, to which the flat tube is connected such that an arbitrary distance can exist between them.

One proposal made in this direction was that the flat tube with the collecting tube present on the rear side was welded without wall welding (Buckel-B c
h w e i s s ung );
This is intended to significantly reduce the considerable manufacturing costs previously required for welding connections using automatic welding or CO2 welding, and at the same time to eliminate the need for skilled workers for welding. .

According to this proposal, in order to take up the welding pressure to be consumed during thinning welding and to serve as a current transmitter, a bush-shaped intermediate piece penetrating the interior of the tube is welded into the flat tube; The end projecting beyond the flat tube on one side of the intermediate piece was simultaneously welded into the collecting tube at all joint points by thinning welding.

Each flat tube is connected to both collection tubes via two intermediate pieces placed close to one and the other end of the tube, with these intermediate pieces being placed longitudinally in the center of the flat tube. It is what was done.

However, it was found that difficulties occurred when venting or exhausting the radiator, because the air cushion created at the top of the longitudinal center of the flat tube was hardly removed or This was because the remainder of the water that had accumulated in the lower part of the center could not flow away, and therefore additional measures were required to eliminate this difficulty.

Otherwise, welding the individual intermediate pieces into flat tubes still represents an expensive process.

This is because only conventional welding methods were considered for this, although joining all the intermediate pieces to the collecting tube by thinning welding represented a significant simplification.

The underlying problem of the invention is therefore to eliminate the above-mentioned disadvantages with respect to the extensive work costs for venting and evacuation of the radiator as well as for welding the intermediate pieces.

This problem is solved in the case of heat sinks of the type mentioned at the outset as follows.

That is, each flat tube is connected to the same collection tube via at least two joints, one of these joints being located close to the upper end of the flat tube and the other close to the lower end. and that the collecting tube and the flat tube have perforations of different diameters at the point of connection, and that in the case of individual perforations in the collecting tube or in the flat tube the area of the surrounding tube wall extends outwards. They are extruded and joined to one another by welding.

A bush-like support part is suitably arranged in each flat tube coaxially with each perforation, and these support parts are applied to the inner walls of the flat tube lying opposite each other to provide a small area for water to flow. Both have one opening on one side.

For perforations lying vertically one above the other at the upper and lower ends of the flat tube, it is suitable that the two supports are connected to each other by a nofridge.

These support parts no longer have to be welded into the flat tube, but can simply be guided inside the flat tube up to the connecting bore before the tube is closed at both ends.

These supporting parts merely serve as current carriers to take up the welding pressure and have the task of ensuring a forced water flow.

They do not serve to create a connection to the collection tube, since this connection is now created by a direct joint elevation of the extruded wall area of one tube with the unchanged wall section of the other tube. Because it was given to me.

At least two upper and lower joints at the upper and lower ends of each flat tube ensure good ventilation and exhaust of the heat dissipation tube.

Other advantages and details of the invention will become apparent from the following description and the drawings, which merely illustrate various embodiments of the invention.

In FIGS. 1 and 2 two different types of embodiments for connecting the flat tube 1 to the collection tube 2 are shown.

The radiator shown in side view in Figure 3 has a number of flat tubes arranged horizontally one above the other in the welded state, only two of which are shown; is connected to vertical collection tubes for the two front and rear channels, only one of which is visible in the figure.

The collecting tube is located on the rear side of the flat tube when viewed from the front, at a distance from both ends of the flat tube, in which case this distance can be chosen arbitrarily.

In the case of the radiator shown in FIG. 1, the vertical tube 2 is a square tube, in one flat tube wall of which the perforations are provided with a perforated edge 3 which is pushed outwards in the form of a funnel.

To connect with the flat tube 1, perforations 4 are formed in it, one near the upper end and the other near the lower end, the diameter of which is equal to the diameter of the perforation in the collecting tube 2 and the perforation edge 3 surrounding it. larger than the diameter of

In the welded state (not shown), the perforated edge 3 is attached to the flat tube 1.
It fits into the borehole 4 of the pipe, so that the contact between them is along one ridgeline, and therefore when joining the flat tube to the collecting tube by thinning welding, a ridgeline weld (Kant) is used.
enschweissung).

The welding machine (not shown) has two electrodes, one of which is pressed against the collector tube 2 and the other against the flat tube 1, the welding pressure being increased to 800 h.

The flat tube 1 is deformed by this pressure.

Therefore, in each flat tube a bush-like support part 5 is arranged coaxially with each borehole, these parts resting against the inner walls of the flat tube lying opposite each other, each with at least one side. It has an opening 6 for water flow.

These support parts are inserted into the flat tube from one open end before the end of the tube is closed.

The two supporting parts 5 arranged vertically one above the other can be connected to each other by a bridge (not shown), so that only one part needs to be inserted at each connection point.

Since the connection points between the flat tube and the collecting tube lie close to the upper end and close to the lower end of the flat tube, perfect ventilation and evacuation of the flat tube is ensured.

When the radiator is filled, the air cushion remaining at the upper end is negligible, and when the radiator is evacuated, only a small amount of water remains at the bottom of the flat tube.

The cost-effective production of this radiator is made possible here by a single use of thinning welding to make the connections, with the support taking up the welding pressure and serving as a current transmitter, This takes into account forced water flow.

The embodiment shown in FIG. 2 differs from the embodiment of FIG. 1 only in the following respects.

That is, the diameter of the perforation rim 3 drawn out in the collecting pipe 2, i.e., the diameter of the perforation edge 3 pushed outward in the shape of a funnel, is the same as the perforation 4 in the flat pipe 1.
is larger than that of the outer wall VC of the flat tube, so that the perforation edge is larger than that of the outer wall VC of the flat tube.
This is why this joining method is called lap welding.

In the case of a third embodiment shown in FIGS. 4 and 5, the collecting tube 10 has a circular cross section, the drawn-out thinning required for thinning welding is in this case pre-provided in the flat tube 11, It is made up of an area 12 of outwardly extruded tube wall, which area lies immediately adjacent to the upper or lower end of the flat tube.

In this embodiment, therefore, the support inside the flat tube can be omitted.

In this case, the diameter of the perforation 13 in the region 12 of the outwardly pushed-out tube wall is smaller than the diameter of the perforation 14 lying coaxially with it in the flat tube 10.

It can be seen from FIG. 5 that the area 12 pushed out of the pipe wall is somewhat pushed out by the welding pressure when viewed from above in the welded state of the pipe, which causes distortion of the collecting pipe. It must be compatible.

This embodiment is superior to the embodiment described above in that the connections located directly at the upper and lower ends of the flat tubes ensure perfect ventilation and evacuation of the radiator.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of one collection tube and two flat tubes, not yet welded, in a first embodiment of the welded connection; FIG. 2 is a vertical sectional view corresponding to FIG. 1 of a second embodiment of the welded connection. FIG. 3 is a side view of the collection tube in a welded state with the flat tube. FIG. 4 is a vertical cross-sectional view of another embodiment in which the collector tube and flat tube are in a welded state. FIG. 5 is a cross-sectional view taken along the line ■-■ in FIG. 4. In the figure, 1... Flat tube, 2... Collection tube, 3...
Perforation edge, 4... Perforation, 5... Support portion, 6... Opening, 10... Collection tube, 11 Flat tube, 12... Range of tube wall, 13... Perforation, 14 ...perforation.

Claims (1)

[Claims] 1. In a radiator with horizontal flat tubes connected to each other by vertical collecting tubes for the front and rear channels, each flat tube 1, 11 has a small .13.14
to the same collection tube 2, 10, one of these connections being located close to the upper end of the flat tube and the other close to the lower end, and that the collection tube and the flat tube have perforations of different diameters at the point of connection;
It is also characterized in that in the case of individual perforations in collecting pipes or flat pipes, the area 3.12 of the surrounding pipe wall is pushed outwards and is in each case connected to the other pipe by thinning welding. radiator.