JPS60202270A - Water heater utilising solar heat - Google Patents

Abstract

PURPOSE:To solve the ''blue water'' problem or the adhesion of insoluble blue substance by a method wherein a metal, the ionization tendency of which is larger than that of the metal composing a heat exchange part, and the heat exchange part are connected by means of an electric conductor with spring action. CONSTITUTION:A magnesium ingot 5a employed as an example of a metal, the ionization tendency of which is larger than that of the metal composing a heat exchange part 4, is screw-fixed through an electric conductor 5e to a clamp plate 5c by means of a mounting bolt 5d. Silicone sealing compound or the like is applied in advance onto the contact surface between the magnesium ingot 5a and the clamp plate 5c. Both of the ends of the clamp plate 5c are curved so as to lie along the heat exchange parts 4 respectively, resulting in allowing to have large electrical contact areas between the heat exchange parts 4 and the clamp plate 5c and at the same time to realize the stable mounting structure. Because the metal having the ionization tendency larger than that of copper elutes positively and consequently the elution of copper is suppressed, no ''blue water'' problem occurs.

Description

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

Conventional configuration and its problems When a heat pipe type alternating exchange section made of copper pipes is used in a solar water heater, the heat exchange of the heat pipe is usually done using bare copper tubes in the water of the hot water tank. Multiple parts 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 often exceeds the tap water standard of 1 ppm. This is because the elution Q of copper ions is greatly affected by the increase in chlorine ions, sulfate ions, nitrate ions, residual chlorine, etc. contained in the water used and the 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 a fatty acid found in soap, sweat, etc.
This is because fatty acid copper or ammonium salt of copper is produced by reacting with ammonium, resulting in a blue substance. This is what is commonly referred to as the ``blue water problem.''

The purpose of the present invention is to eliminate the so-called "blue water" problem in which the above-mentioned insoluble blue substances are deposited.

Structure of the Invention In order to achieve the above object, the present invention comprises a heat exchanger and a metal having a greater tendency to ionize than the heat exchanger, which are frozen with 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, into which a copper pipe 2, which is a copper pipe filled with fluorocarbon gas or the like, is attached. There is a heat exchange part 4 in the upper part of the heat pipe 2, which functions to transfer the collected 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 a size that allows it to be installed and removed at will from the upper opening 3a1 of the hot water storage tank, ie, from the portion where the water supply ball shoe is attached, as shown in FIG.

The structure of this anti-corrosion unit 5 will be explained with reference to FIG.

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 installed by Pol)
5a, the fixing plate ScK is screwed and fixed via a fixing wire (an example of an electric conductor) 5e. A silicone sealant 5b or the like is applied in advance to the contact surface between the magnesium ingot 5a and the fixing plate 5c. Both ends of the fixing plate 5c are curved so as not to follow the heat exchanger 4 furnace, providing a large electrical contact area with the heat exchanger 4 and stabilizing the mounting structure.

Usually, this fixing plate 5c is best made of stainless steel, copper, or a copper alloy. The fixed wire 5/ is made of stainless steel wire, etc.
It is formed in the shape of a letter to give it a none effect. The ends of the fixed wires 5I are bent into an L-shape and fixed so as to be hooked onto the lower sides of the two heat exchange parts 4. This gate pipe is usually shaped like an iB length, but the length used for mounting the anticorrosion unit 5 is two lengths. 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, the gold maple, which has a greater ionization tendency than copper, is actively eluted and the leaching of copper is suppressed, so the "blue water problem" does not occur. As a result, the electrical connection with the heat exchange part is maintained well for a long time underwater, and the anti-corrosion function is stabilized.

[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 solar water heater. FIG. 1. Main body of solar water heater, 2...Heat pipe, 2a... Heat collecting part fin, 3... Hot water storage tank, 3a... Top opening, 3b...・Water, 4・
...Heat exchange section, 5. -Anti-corrosion unit, 5a...
...Ingot (gold type), 5b...Sealant, 5cm
...Fixing plate, 5d...Mounting bolt, 5/...
・Fixed wire (electrical conductor), 6... Pole tap. Name of representative: Patent attorney Toshio Nakao and one other name]
Ri1

Claims (2)

[Claims] (1) A solar water heater in which a heat exchange part made of copper or a copper alloy and a metal having a greater tendency to ionize than the metal at the bottom of the heat exchange part are connected by an electric conductor having a spring action. (2) The solar water heater according to claim 1, wherein the heat exchange section is composed of a plurality of heat pipes.