JPS60235955A - Solar heat water heater - Google Patents

Abstract

PURPOSE:To prevent the so-called bluish water problem from occurring, by a method wherein a rod of a metal having an ionization tendency higher than copper is brought into electrical contact with a copper-made heat-exchanging part, and is fitted substantially in parallel to the heat-exchanging part by a fixing wire having a spring action. CONSTITUTION:The rod 5a of a metal (e.g., Mg) having an ionization tendency higher than that of the metal (copper or a copper alloy) constituting a plurality of heat-exchanging parts 4 is brought into electrical contact with at least one of the parts 4, and is fitted substantially in parallel to the part 4 by the fixing wire 5e having a spring action. Accordingly, the metal of the rod 5a is positively dissolved in a liquid to inhibit the dissolution of copper, so that the so-called bluish water problem in which an insoluble blue substance is deposited is prevented from occurring.

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 heat exchanger made of copper pipes is used in a solar water heater, the heat exchanger of the Heatvibe 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 often exceeds tppm, which is the standard for tap water. 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 a fatty acid found in soap, sweat, etc.
This is because fatty acid steel 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.

OBJECTS OF THE INVENTION The present invention aims 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-mentioned object, the present invention brings a metal rod having a higher ionization tendency into contact with the heat exchanger in parallel,
It is attached using a fixed wire with spring action.

DESCRIPTION OF THE EMBODIMENTS In FIG. 1, reference numeral 1 denotes the main body of a solar water heater, inside of which a sita heat vibrator 2 containing fluorocarbon gas or the like in a copper pipe is attached. There is a heat exchange part 4 in the upper part of the heat vibrator 2, which functions to transfer the amount of heat collected from solar heat to the water 3b of the hot water storage tank 3.

An anti-corrosion unit 5 is attached to the -L side of this heat exchange section 4. This anti-corrosion unit 5 is machined into a form and size that allows it to be attached and removed at will from the upper surface opening 3a of the hot water storage tank, ie, the portion where the water supply pole tap 6 is attached, as shown in FIG.

The structure of this anti-corrosion unit 5 will be explained with reference to FIG. 3+c.

Reference numeral 5& is a bar made of mag-neutral material, which is used as a metal having a greater tendency to ionize than the heat exchanger 4. The diameter of this rod 5a is approximately the same as the diameter of the copper pipe used in the heat exchange section 4. The length may extend over the entire straight portion of the heat exchange section 4, but the minimum length may be arbitrarily selected depending on the required amount. That is, if the water quality is alkaline and hardly any copper ions are generated, it is possible to achieve the purpose with the shortest length. This stick5. 3, a fixed wire 5e having spring elasticity is made into parallel and electrical contact with the heat exchange part 4 as shown in FIG. It is installed using. When fixed in this way, the fixed line 5e
The elasticity of the spring presses down the bar 5a via the cannula pin 5b, and at the same time, the fixing line 5e running in parallel serves to prevent the maginneem bar 5a from rotating. Since this anti-corrosion unit 5 has a simple configuration, it is possible to set the length required for a plurality of heat exchange parts 4.

However, since the heat exchange parts 4 of the plurality of heat vibes 2 are electrically integrated by the fins 2a of the heat collecting part, the effect of installing the corrosion protection unit 5 will vary depending on the predetermined length of time. The length is exactly the same. Also, according to the illustration, at first glance it appears that the rod 5a is locally cut from the center by the cannula pin 5b, causing wear, but in reality, it comes into contact with the metal side that should be protected from corrosion, that is, the heat exchange part 4. There is no need to worry about this as the parts will be consumed first. In other words, wear starts from the contact portion.

On the other hand, as a structural feature, the state of mutual contact between the rod 5a and the heat exchanger section 4 is a cylindrical line contact.

Therefore, the spring elasticity acts strongly at the beginning of use, and as the diameter decreases due to wear and tear, the area of the contact portion tends to expand.

That is, line contact changes to surface contact as it is used. When the pressing force is strong, it is a line contact, and when the pressing force is weak, it changes to a surface contact, thereby maintaining the electrical connection condition.

In addition, from a structural point of view, the fixing wire 5e is only processed into a hairpin shape, so under the conditions before it is installed, the part (B) tends to open around the part (A) in Figure 3. However, since the cannula pin 5b is formed into a wave shape in the properly installed state, this tendency can be suppressed.

On the other hand, due to the shape effect of the cannula pin 5b, it is possible to maintain a stable shape as shown in the figure with the spring elastic force of the fixed line 5e along the rod 5a. That is, the pin 5b will not fall off carelessly. The fixed wire 5e and the cannula pin 5b are made of electrically conductive stainless steel wire, etc. Effects of the Invention In the present invention, metals with a greater tendency to ionize than copper are actively eluted, and the copper Since the elution of water is suppressed, the "blue water" problem no longer occurs. 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.

Furthermore, since the heat exchange part and the metal are substantially parallel, the following effects can be obtained.

(1) It can be installed without interfering with the convection effect of water in the hot water tank.

(2) The number of anti-corrosion metal rods can be selected depending on the water quality conditions. That is, no unnecessary financial burden is placed on the user.

(3) (Similar to item 21, the length of the metal rod can also be changed.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the solar water heater of the present invention, FIG. 2 is a partially cutaway perspective view of the main part, and FIG. 3 is a perspective view of the anticorrosion unit. 1... Main body of solar water heater, 2... Heat vibrator, 2a... Heat collection fin, 3... Hot water storage tank, 3a... Top opening, 3b... ...Wed, 4
... Heat exchange section, 5 ... Corrosion protection unit, 5
a... Magnesium rod (metal rod), 5b.
...Kannuki pin, 5e...Fixed line, 6 ・
...Pole tap. Name of agent: Patent attorney Toshio Nakao and 1 other person33
figure

Claims (1)

[Claims] At least one of the plurality of heat exchange parts made of copper or copper alloy is electrically brought into contact with a metal rod having a higher ionization tendency than the metals constituting the heat exchange part, and a fixed wire with a spring action is used. The heat exchanger is a solar water heater installed approximately parallel to the heat exchanger.