JPH0377423B2 - - 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 type positive 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 storage tank. are inserted. In this type of system, the water heated and stored has a high concentration of copper ions as copper, which is the material of the heat exchanger, is eluted. 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 connects a heat exchange part and a metal having a higher ionization tendency than the heat exchange part by an electric conductor having a spring action.

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 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 fixed to a fixed wire (an example of an electrical conductor) 5 using a mounting bolt 5a.
It is screwed and fixed to the fixing plate 5c via e.
A silicon sealant 5b is applied in advance to the contact surface between the magnesium ingot 5a and the fixing plate 5c.
etc. are applied. Both ends of the fixing plate 5c have a curved shape along the heat exchange section 4, which provides a large electrical contact area with the heat exchange section 4, and also stabilizes the mounting structure.

Usually, this fixing plate 5c is made of stainless steel or copper.
Copper alloys are the best. The fixed wire 5e is made of stainless steel wire or the like, and is formed into a curved shape to provide a spring action. The tip of this fixed wire 5e is L
It is bent into a letter shape and fixed so as to be hooked onto the lower sides of the two heat exchange parts 4. This spring action generates bending stress and rebound elasticity between the mounting bolt 5d and the heat exchanger 4 due to the weight of the magnesium ingot 5a, while the heat exchanger 4 is moved by the fixing wire 5e and the fixing plate 5c. It has a pinching contact force. This heat pipe is usually formed of a plurality of heat pipes, but two lengths are used for mounting the anticorrosion unit 5. Further, the plurality of heat pipes are electrically integrated by the fins 2a of the heat collecting portion.

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. In addition, since the electric conductor has a spring action, even if metals with a large ionization tendency are eluted and deformed due to weight loss, or
Even if elution loss occurs from any part, such as the fixed part, the necessary electrical connection (contact state) is
Since the spring pressure can be kept constant at all times, the anticorrosion effect is stable over a long period of time. Furthermore, heat exchangers constituting equipment are usually important core components that fulfill the functional purpose of the equipment, so they need to have a long life, and many of them have a configuration that cannot be easily replaced. Therefore, it is necessary to easily replace and remove the "corrosion protection unit" that protects the parts. From this point of view, this unit has a "top opening"
A solar water heater consisting of a hot water storage tank can accomplish its purpose extremely easily and appropriately.

[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 perspective view of the main parts of the solar water heater, Fig. 3 is a perspective view of the corrosion protection unit, and Fig. 4 is the main part of the same. FIG. 1... Main body of solar water heater, 2... Heat pipe, 2a... Heat collection part fin, 3... Hot water storage tank,
3a...Top opening, 3b...Water, 4...Heat exchange section, 5...Corrosion protection unit, 5a...Ingot (metal), 5b...Sealant, 5c...Fixing plate, 5
d...Mounting bolt, 5e...Fixed wire (electric conductor), 6...Ball tap.

Claims (1)

[Scope of Claims] 1. A heat exchange section made of copper or a copper alloy, and a metal having a higher ionization tendency than the metals constituting the heat exchange section, are placed on a fixed plate having a curved shape at both ends along the heat exchange section. The anti-corrosion unit is constructed by attaching the fixed wire from the center of the lower surface to the center of the fixed wire, which is an electrical conductor with a spring action and processed into an L-shape with L-shaped bends at both ends, and tightened together with bolts. A solar water heater in which the heat exchange section is sandwiched and connected in the vertical direction between an L-shaped bent portion of a fixed wire and a curved shape of the fixed plate. 2. The solar water heater according to claim 1, wherein the heat exchange part is composed of a plurality of heat pipes, and has an opening on the upper surface through which a corrosion protection unit can be attached and detached.