JPH0222862B2 - - 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 a heat pipe heat exchange section made of copper pipes is used in a solar water heater, the heat exchange section of the heat pipe is usually placed in a bare copper tube under water in a hot water tank. Multiple lines are inserted. In this type of system, the water stored at an elevated temperature 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 brings a metal with a higher ionization tendency into contact with the heat exchange part and attaches it with a fixed wire having a spring action, and the fixed wire is used for heat exchange when the metal is consumed. This is to make them leave the department.

DESCRIPTION OF THE EMBODIMENTS In FIG. 1, reference numeral 1 denotes the main body of a solar water heater, and a heat pipe 2 in which fluorocarbon gas or the like is sealed in a copper pipe is installed inside the main body. There is a heat exchange section 4 above the heat pipe 2, which functions to transfer the amount of heat collected from the sun 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 such a size that it can be attached and removed at will from the upper opening 3a of the hot water storage tank, ie, from the portion where the water supply ball tap 6 is attached, as shown in FIG.

Referring to FIG. 3, the structure of this corrosion protection unit 5 will be explained.

5a is a rod of magnesium, which is used as a metal having a greater tendency to ionize than the heat exchanger 4. The length of this rod 5a may be two as shown in the figure, but it may also be one length or a plurality of rods.

The magnesium rod 5a used is one in which the core wire is not simultaneously processed, that is, the entire round rod is made of magnesium material. The fixed wire 5l is made of stainless steel wire or the like and processed into a V-shape to have spring elasticity. V-shaped double cut, tip is L
Bend it into a letter shape (Figure 6).

Structurally, it is this length, but when installing it, hook this fixed wire 5l to the central pipe of the three heat exchange parts 4, and then attach it to the magnesium rod 5a2.
Place the books in a cross shape as shown in the figure, hook both ends of the 5L fixed wire to the heat exchange parts 4 on both sides,
It is stopping it. In this state, the fixed line 5l intersects the heat exchange section 4. This heat pipe 2 is usually formed of a plurality of pieces, but the length of three pieces is used for mounting the corrosion protection unit 5. or,
The plurality of heat pipes 2 have fins 2a of a heat collecting part.
This makes them electrically integrated. When the corrosion protection unit 5 is used for a long period of time and the magnesium rod 5a is worn out, it becomes disconnected as shown in FIG. Even if detachment is incomplete, the fixing wire 5l to the heat exchange part 4 has a space at the L-shaped bent part B, and does not create conditions that would cause crevice corrosion.

On the other hand, as a structural feature, the fixed wire 5l, the magnesium rod 5a, and the heat exchanger 4 are in mutual contact with each other, as shown in FIG. The condition is the basis,
There are very few areas that cause normal crevice corrosion.

Effects of the Invention In the present invention, metals with a higher ionization tendency than copper are actively eluted, and the leaching of copper is suppressed.
The "blue water" problem will no longer arise. In addition, since spring elasticity is used, electrical connection with the heat exchange part is maintained well over a long period of time underwater, resulting in stable corrosion protection.

In other words, although it is effective as a sacrificial anode rod, when the sacrificial anode rod wears out, it becomes necessary to add it again. If left without this addition, the connection between the fixed wire and the heat exchanger will usually create an opportunity for electrolytic corrosion or crevice corrosion due to contact between different metals. According to this configuration, the consumption of the sacrificial anode rod is reduced to
Since the fixed line can be removed, there is no need to worry about the above. Even if insufficient detachment occurs for some reason, there is almost no risk of crevice corrosion since all structural contact parts are points. On the other hand, for the above-mentioned purpose, the structure of the fixed wire requires only L-shaped bending, which is easy to work with, can be provided at low cost, and has high reliability.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a solar water heater according to an embodiment of the present invention, Fig. 2 is a partially cutaway perspective view of the main parts, Fig. 3 is a perspective view of the anti-corrosion unit, and Fig. 4 is a perspective view of the anti-corrosion unit. FIG. 5 is a front view of the unit, FIG. 5 is a front view after the same operation, and FIG. 6 is a perspective view of the fixing line. 1... Main body of solar water heater, 2... Heat pipe, 2a... Heat collection fin, 3... Hot water storage tank, 3
a...Top opening, 3b...Water, 4...Heat exchange section, 5...Corrosion protection unit, 5a...Magnesium rod (metal), 5l...Fixed wire, 6...Ball tap, I... Point contact part, B...L-shaped bent part.

Claims (1)

[Claims] 1. On one side of a plurality of heat exchange parts made of copper or copper alloy, metal rods having a higher ionization tendency than the metals constituting the heat exchange parts are brought into cross-abutment in a cross shape,
The metal rod is locked and fixed in a canopy shape by a W-shaped fixing wire with a spring action, and when the metal rod wears out or breaks, the locking is released and the W-shaped fixing wire can be detached from the heat exchange section. vessel.