JPH0113962Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a solar heat collecting device, particularly to a heat exchanger portion thereof.

Configuration of conventional example and its problems In the solar heat collector shown in FIG. The conventional installation situation of the heat exchanger 3 in the interior was as shown in FIG. As shown in FIG. 2, the heat exchanger 3 is inserted into the can body 6 by providing an opening in the can body 6 in the heat storage tank 2 and attaching a flange 7 thereto. A flange 8 disposed at the rear end of the flange 7 was fastened to the flange 7 via a packing 9. This will be explained in more detail using FIG. In order to insert the heat exchanger 3 formed in a spiral shape into the insertion hole 8a provided in the flange 8 and braze it with the brazing material 11, it is necessary to insert the heat exchanger 3 in a spiral shape corresponding to the area to be inserted into the flange 8. Spiral heat dissipation fin 1
If the gap between the insertion hole 8a and the straight pipe 12 is not made small, a good brazing result will not be obtained and sufficient watertightness will not be obtained. Therefore, a portion of the spiral heat dissipating fin 10 is removed, formed into a straight pipe 12, and inserted into the flange 8.
This is why it is soldered. However, as a result of forming the straight pipe 12, the wall thickness of the straight pipe part is thinner, and the heavy heat exchanger 3 is only cantilevered on the flange 8 side, so vibrations, especially during transportation, are reduced. If this happens, cracks may occur in the straight pipe section 12 shown by arrow A in FIG. 3, resulting in damage.

Purpose of the invention The present invention solves the above problems and increases the strength of the heat exchanger.

Structure of the invention In order to achieve the above object, the present invention fits a cylindrical reinforcing material around the outer periphery of the straight pipe portion of a heat exchanger, and this reinforcing material is inserted into the insertion hole of a flange having an insertion hole. The reinforcing material is inserted and fixed with brazing, and the heat exchanger insertion side of the reinforcing material is curved and expanded.

DESCRIPTION OF EMBODIMENTS The present invention will be described below with reference to an embodiment shown in FIG.

The solar heat collector 1 shown in FIG. 1 and the heat exchanger in the heat storage tank 2 are connected via piping via a circulation pump 4, and as shown in FIG.
A cylindrical reinforcing member 14 is fitted to the outer periphery of 3. The reinforcing material 14 was inserted into the insertion hole 8a of the flange 8 having the insertion hole 8a and fixed with brazing, and the heat exchanger insertion side 15 of the reinforcing material 14 was curved and expanded.

There are two brazing methods. In the first method, the reinforcing material 14 and the straight pipe section 13 are first brazed, but the reinforcing material 14 on the heat exchanger side is curved and expanded, and the brazing is applied between the fins 16 and the expanded pipe section 15. Place the material 17 and wax it. Brazing material 17 is reinforcement material 1
4 and the straight pipe 13, and the brazing conditions are selected so that there is no gap. Next, this reinforcing material 14 is inserted into the insertion hole 8a of the flange 8, and the flange 8 and the reinforcing material 14, as well as the reinforcing material 14 and the U-bend 19, are bonded using a brazing material 18 having a lower melting point than the brazing material 17. Attach the insert solder at step 18. Furthermore, U
The bend 19 is a pipe for connecting the heat exchangers 3 in series. The reason why the melting points of the brazing materials 17 and 18 are different is that the expanded pipe part 15 and the straight pipe part 1 of the reinforcing material 14
The brazing portion 17 of No. 3 is heated to prevent the brazing material 17 from melting and flowing out in the subsequent heating step of brazing the reinforcing material 14 and the flange 8 and the reinforcing material 14 and the U-bend 19. This is to make the melting point of the brazing material 17 higher than that of the brazing material 18.

Next, the second brazing method will be explained. A brazing material 1 is placed between the expanded tube portion 15 and the fin 16 of the reinforcing material 14.
7, this reinforcing material 14 is inserted into the insertion hole 8a of the flange 8, and the U-bend 19 is inserted into the cylinder of this reinforcing material 14. In this state, the corners of the flange 8 and the reinforcing material 14 and the reinforcing material 14 and the U-bend 19 are brazed with a brazing material 18 having the same melting point as the brazing material 17. By heating with this soldering,
The brazing material 17 is melted, and the expanded tube portion 15 and the straight tube portion 13 of the reinforcing material 14 can be brazed at the same time.

Effects of the invention (1) As explained in the conventional example shown in Fig. 3, there are two possible causes of damage to the straight pipe section of the heat exchanger. The wall thickness of the straight pipe section where the spiral fins 10 are interrupted is thin, and the second problem is that the straight pipe and the flange fixing it are adjacent to each other at right angles, making it easy for stress to concentrate. In this invention, the fourth
As shown in the figure, we were able to increase the wall thickness by integrally brazing the reinforcing material and the straight pipe.
By forming an expanded pipe part in the reinforcing material and filling it with brazing material along this R shape, the adjacent shape of the straight pipe part can be formed into an R shape without edges, and stress concentration can be prevented. Vibration damage was prevented.

(2) In the embodiment, a brazing material 17 is placed between the expanded tube part 15 of the reinforcing material 14 and the heat dissipation fin 16 of the heat exchanger, and the heat dissipation fin 16 is brazed with flame. In addition to preventing melting and loss, the gap between the reinforcing material 14 and the straight pipe 13 can be eliminated, and crevice corrosion due to water in the heat storage tank 2 can also be prevented.

(3) In the embodiment, by expanding the reinforcing material 14 into a curved shape, it is possible to prevent damage to the straight pipe when it is inserted into the straight pipe.

(4) In the embodiment, by forming the reinforcing material into a curved shape, it is possible to hold the brazing material (ring wax, etc.), which increases the latitude in the brazing posture and facilitates the brazing work.

[Brief explanation of the drawing]

Fig. 1 is a schematic system diagram for explaining a conventional example and an embodiment of the present invention, and Fig. 2 is a cross section showing the attachment relationship between a heat exchanger and a heat storage tank for explaining the conventional example and an embodiment. 3 are sectional views showing a conventional example, and FIG. 4 is a sectional view showing an embodiment of the present invention. 1... Solar heat collector, 2... Heat storage tank, 3... Heat exchanger, 4... Circulation pump, 8... Flange, 1
3... Straight pipe, 14... Reinforcement material.

Claims (1)

[Scope of utility model registration request] A solar heat collector and a heat exchanger with radiation fins in a heat storage tank are connected via piping via a circulation pump, and a cylindrical reinforcing material is fitted to the outer periphery of the straight pipe portion of the heat exchanger,
This reinforcing material is inserted into the insertion hole of the flange provided in the heat storage tank and fixed with brazing, and the heat exchanger insertion side of the reinforcing material is curved to expand the solar heat collector.