JPH034461Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is a rod-like material that is inserted into a through hole drilled near the fin tube into which a tube is inserted, heated and melted, and soldered to the fin and tube. The invention relates to brazing material.

"Problems to be Solved by the Prior Art and Ideas" A heat exchanger has a plurality of fins arranged on a tube at predetermined intervals. In order to increase the efficiency of heat transfer between the fin and the tube, a tube that is slightly larger than the hole diameter of the fin (approximately 0.01 mm) is press-fitted in order to bring the flange of the fin into close contact with the outer circumferential surface of the tube, or After inserting the fin, you can expand the diameter of the tube by press-fitting an expansion rod, or by inserting the tube into the fin, immerse it in water, freeze the water, and expand its volume as ice. The diameter is being expanded. Mechanical bonding alone as described above is not sufficient to increase heat transfer efficiency, and it is also unable to adequately follow temperature changes during use, resulting in gaps between the fins and the tubes forming during long-term use. This caused the parts to become rattled and unusable.
Therefore, after the fins and the tube have been mechanically joined as described above, a solder metal is further melted and poured to join them.

The first step is to melt this brazing material and join it.
As shown in the figure and FIG. 2, a rod-shaped brazing material 4 is inserted into a through hole 3 drilled near the tube 1 of the fin 2 into which the tube 1 is inserted, heated, and the flange 5 of the tube 1 and the fin 2 are bonded together. They are joined by melting and pouring between them. The through holes 3 are arranged directly in each fin 2 so that a bar-shaped wax rod can be inserted therethrough. When this brazing material 4 is inserted into the through hole 3 and housed in the furnace,
The vibrations transmitted to the furnace, the vibrations of the electric current, the way the fin 2 into which the tube 1 is inserted are installed in the furnace, i.e., it is difficult to keep the brazing material 4 in a horizontal position when it is penetrated, etc. For this reason, there is a problem in that the brazing material 4 falls out of the through hole 3 and brazing cannot be performed.

``Means that the invention attempts to solve'' Therefore, in view of the above-mentioned circumstances, the present invention has been developed to prevent various vibrations from being transmitted to the furnace and to prevent the brazing metal from being sufficiently filled when the solder metal is inserted into the through hole and housed in the furnace. In order to prevent the brazing material from falling out of the through-hole even when the brazing material cannot be placed in a horizontal position, a stopper portion larger than the through-hole is formed at one end of the brazing material.

``Operation'' Insert the brazing material into the through hole of the fin into which the tube is inserted. Even if various vibrations are transmitted to the furnace or the brazing material cannot be placed in a horizontal position, the stopper portion will not engage with the through hole and the brazing material will not fall out of the through hole.

Embodiment As shown in FIG. 3, a stopper portion 12 larger than the through hole 3 into which the brazing material 11 is inserted is formed at one end of a rod-shaped brazing material 11. The stopper portion 12 is shaped like a nail head, and its size is, for example, the same as that of the brazing material 11.
Form to 180% or more size. A brazing material 11 is penetrated into a through hole 3 bored near the tube 1 of the fin 2 into which the tube 1 is inserted. When this is placed in a furnace and heated, the brazing material 11 is melted and the flange 5 of the fin 2 is heated.
and the outer circumferential surface of the tube 1 and are joined together.

Vibrations transmitted to the furnace that houses the fins 2 into which the tube 1 is inserted, vibrations of electricity, or even if the brazing material 11 cannot be placed in a horizontal position, the stopper portion 12 engages with the through hole 3 and falls off. Without,
Can be soldered. In addition, if the stopper part 12 is placed slightly higher when it is housed in the furnace, it can be completely prevented from falling out from the through hole 3.

``Effects of the invention'' As mentioned above, the present invention uses a bar-shaped brazing material that is inserted into a through hole drilled near the fin into which the tube is inserted, heated and melted to braze the fin and the tube. Since a stopper portion larger than the through hole is formed at one end of the brazing material, when the brazing material is inserted into the through hole and housed in the furnace, vibrations transmitted to the furnace, vibrations of electricity flowing through the tube, and Even if the soldering material cannot be placed in a horizontal position due to the way the inserted fins are installed in the furnace, the soldering material will not fall out of the through hole and brazing will not be impossible.

Further, since a stopper portion larger than the through hole is simply formed at one end of the brazing material, it is extremely easy to perform, inexpensive, and sufficient brazing can be achieved.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional view of a rod-shaped brazing material inserted into a through hole drilled near the fin tube into which the tube has been inserted, Figure 2 is a side view of Figure 1, and Figure 3 is the main body. FIG. 2 is a side view of an embodiment of the invention. 1...Pipe, 2...Fin, 3...Through hole, 11
... Brazing material, 12 ... Stopper part.

Claims (1)

[Scope of utility model registration request] A rod-shaped brazing material that is inserted into a through hole drilled near the fin tube into which the tube is inserted and heated and melted to braze the fin and the tube, and a stopper larger than the through hole is provided at one end of the brazing material. A brazing material characterized by having a part formed therein.