JPH038460B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a solar water heater.

Conventional structure and its problems When heat pipes made of copper pipes are used in solar water heaters, usually multiple heat exchange parts of the heat pipes are inserted as bare copper tubes into the water of the hot water tank. Ru. In this type of system, the heated and stored water has a high copper ion concentration due to the elution of copper, which is the material of the heat exchanger. Corrosion typically occurs over the entire surface of so-called copper pipes.

This copper ion concentration is 1ppm, which is the tap water standard.
It often exceeds. This elution of copper ions is largely influenced by an increase in chlorine ions, sulfate ions, nitrate ions, residual chlorine, etc. contained in the water used and a decrease in hydrogen ion concentration (PH).

If water containing copper ions is repeatedly brought into contact with bathtubs, washbasins, and towels, insoluble blue substances may adhere to them. This is because copper reacts with fatty acids and ammonium contained in soap and sweat, producing fatty acid copper or ammonium salts of copper, resulting in a blue substance. This is what is commonly referred to as the "blue water" problem.

OBJECT OF THE INVENTION The purpose of the present invention is to eliminate the so-called "blue water" problem in which the above-mentioned insoluble blue substances adhere.

Structure of the Invention In order to achieve the above object, the present invention electrically connects a metal such as magnesium, which has a higher ionization tendency than its constituent metals, to the heat exchanger on a substrate, and also connects this metal to the heat exchanger in the form of a box with an opening on the top. It is installed inside the container.

DESCRIPTION OF EMBODIMENTS In FIG. 1, reference numeral 1 denotes the main body of a solar water heater, and a heat pipe 2, which is a copper pipe filled with fluorocarbon gas or the like, is installed inside the main body of the solar water heater. There is a heat exchange part 4 in the upper part of the heat pipe 2, which functions to transfer the amount of heat produced by scorching solar heat to the water 3b of the hot water storage tank 3. A corrosion protection unit 5 is attached to the upper surface of this heat exchange section 4. This anti-corrosion unit 5 is machined to have a form and size that allows it to be attached and removed at will from the hot water storage tank and the upper surface opening 3a, ie, from the portion where the water supply ball tap 6 is attached, as shown in FIG.

The structure of this anticorrosion unit 5 will be explained with reference to FIGS. 3, 4, and 5. 5a is a magnesium ingot used as an example of a metal having a greater tendency to ionize than the heat exchange part 4. This magnesium ingot 5a is screwed and fixed by a mounting bolt 5d passing through the fixing plate 5c and the box-shaped container 5f via one end of the fixing wire 5e. A silicone sealant 5b is applied in advance to the contact surface between the magnesium ingot 5a and the fixing plate 5c.
etc. are applied. At both ends of the fixing plate 5c, a bent shape is made so as to follow the heat exchange part 4, a fitting structure is made with the heat exchange part 4, and a boat-shaped protrusion is made parallel to the heat exchange part 4. This makes the mounting structure stable. Usually, this fixing plate 5c is best made of stainless steel, copper, or a copper alloy. The fixed wire 5e is made of a copper electric material such as stainless steel, and is formed into a U-shape to have spring elasticity. This fixed line 5
The other end of e is bent into an L shape so that it is hooked onto the lower surfaces of the two heat pipe heat exchange sections 4 and brought into contact. This heat pipe 2 is usually formed of a plurality of pieces, but the length of two pieces is used for mounting the corrosion protection unit 5. Further, the plurality of heat pipes 2 are electrically integrated by a scorching part fin 2a.

Further, a V-shaped groove is prepared on the fixing plate 5c, and the fixing wire 5e is inserted into the groove, and the box-shaped container 5f is inserted into the fixing plate 5c.
It is movably held between the lower surface side of the

The box-shaped container 5f is usually made of a plastic material that is highly water- and heat-resistant, and the ingot 5a is put into it from the open top side. Furthermore, 5i is magnesium hydroxide powder etc. from the ingot 5a.

Effects of the Invention In the present invention, metals with a higher ionization tendency than copper are actively eluted, and the eluting of copper is suppressed.
The "blue water" problem will no longer arise.

Also, after long-term use or in areas with poor water quality,
Even if a relatively large amount of magnesium hydroxide, etc. is generated, the white powdery substance accumulates in the box-shaped container and hardly flows into the hot water supply, making it difficult to maintain the cleanliness of the water. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a solar water heater according to an embodiment of the present invention, Fig. 2 is a perspective view of the same main part, Fig. 3 is a perspective view of the corrosion protection unit, and Fig. 4 is an exploded perspective view of the main part. ,
FIG. 5 is a sectional view of the main part. 1... Main body of solar water heater, 2... Heat pipe, 2a... Fiery fin, 3... Hot water storage tank, 3
a...Top opening, 3b...Water, 4...Heat exchange part, 5a...Ingot (metal), 5b...Sealant, 5c...Fixing plate, 5d...Bolt, 5e...
...Fixed line, 5f...Box-shaped container (container), 5i...
Magnesium hydroxide powder, 6...ball tap,
A...Boat-shaped convexity, B...V-shaped groove.

Claims (1)

[Claims] 1. In a solar water heater that has a water supply ball tap and an upper heat exchange section of a heat pipe inserted into a hot water storage tank with an opening on the top surface, this heat exchange section is made of copper or copper alloy. A metal having a higher ionization tendency than the constituent metals is electrically connected, and the metal is installed in a box-shaped container having an opening on the top side, and the heat exchange part is located on the bottom side of the container. A solar water heater installed in.