JPH0776434B2 - Anticorrosion device for hot water storage tank - Google Patents

Description

TECHNICAL FIELD The present invention relates to an anticorrosion device for a hot water storage tank, which is arranged in a hot water storage tank such as an electric water heater or an oil water heater to prevent corrosion of the inner surface of the hot water storage tank. .

2. Description of the Related Art Generally, a hot water storage tank of a water heater is easily corroded, and therefore, as shown in FIG.
Is attached. The cathodic protection device 2 comprises, for example, an electrode plug 3 and an electrode wire 4, as shown in FIG. A part 7 of the metal member 6 faces the hot water storage tank 1. A glass lining 8 is provided on the inner surface of the hot water storage tank 1. In this way, the anticorrosion device 2 having the electrode wire 4 is exposed to the hot water storage tank 1, and a positive potential is applied to the electrode wire 4.
It is well known that corrosion of the hot water storage tank 1 which is in contact with water by applying a negative potential to the hot water storage tank 1 can be prevented (Jitsuko Sho 55).
-18376).

Problems to be Solved by the Invention However, in the conventional one, the metal member 6 of the electrode plug 3 is used.
Since the part 7 facing the inside of the hot water storage tank 1 does not have the glass lining 8 coating, a part of the anticorrosion current flows to the metal member 6 in a short-circuited manner, so that Mg contained in the hot water or
Positive ion components such as Ca and Si are deposited as scale a and are concentratedly attached to a portion 7 of the metal member 6. Then, there is a problem that the mountain of the scale a covers the entire electrode wire 4 for a long time, finally blocks the anticorrosion current, and the anticorrosion cannot be maintained.

In view of the above problems, the present invention provides an electrocorrosion protection device that does not attach scales to electrode wires, no matter how strong the water quality is.

Means for Solving the Problems In order to solve the above-mentioned problems, a corrosion preventive device for a hot water storage tank of the present invention is a temperature-sensitive deformable member made of a shape memory alloy that covers the periphery of an electrode wire facing the hot water storage tank of an electrode plug. Is electrically insulated, and the temperature-sensitive deformable member is deformed in response to changes in hot water temperature and restored when cold.

The hot water tank anticorrosion device of the present invention, when the hot water temperature is changed, that is, when the hot water temperature is low, the temperature-sensitive deformable member made of a shape memory alloy is along the electrode wire, and when the hot water temperature is high. The temperature-sensitive deformable member repeats the deformation and restoration operations because the hot water temperature changes every time hot water is supplied, so the scale should not adhere to or accumulate on the electrode wires or electrode plugs. Becomes

Embodiment An anticorrosion device for a hot water storage tank of a water heater according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, 10 is the hot water storage tank of the water heater, and the electrode plug
11 is attached to the side wall, and the electrode wire 12 is projectingly provided in the hot water storage tank 10. Specifically, the electrode plug 11 is composed of an insulating member 13 for holding the electrode wire 12 and a metal member 14 made of iron surrounding the insulating member 13 and having a screw portion on the outside.
It is attached to the holder 15 attached to 10 by screwing and can be removed for maintenance.
The end 16 of the metal member 14 of the electrode plug 11 is a hot water storage tank 10
Facing inside. The inner surface of the hot water storage tank 10 is provided with a glass lining 17.

The characteristic configuration of this embodiment is as follows. That is, the temperature-sensitive deformable member 18 made of a shape memory alloy is attached to the tip of the metal member 14 of the electrode plug 11 facing the hot water storage tank 10. This temperature-sensitive deformable member 18 has a plurality of blades 19 as shown in FIGS. 1 and 2, and the blades 19 are located along the electrode wire 12 when the temperature of the hot water is low, and when the temperature of the hot water is low, 1 As shown by the dashed line in FIG. 2, the shape is memorized so as to take a position apart from the electrode wire 12. An insulating member 20 is provided at the tip of the electrode wire 12 to prevent the blade 19 of the temperature-sensitive deformable member 18 from coming into contact with the electrode wire 12.

In the above structure, the water heater repeats the deformation and restoration operations only by the temperature change of the cold heat of the hot water in the hot water storage tank 10 to prevent the scale from adhering and accumulating as in the part b. Therefore, the electrode plug 11 and the electrode wire 12
The anticorrosion current is not blocked by the scale b around the, and the anticorrosion performance can always be maintained. The insulating member 20 can prevent the concentration of the anticorrosion current at the tip.

Although the plate-shaped coil is described in this embodiment, the same effect can be obtained by utilizing the deformation and expansion / contraction of the linear coil as shown in FIG. In this case, the temperature-sensitive deformable member 18 is extended when it is cold, and is contracted when it is heated, so that the insulating member 20 repeatedly moves each time.

EFFECTS OF THE INVENTION As is apparent from the above description of the embodiments, the present invention can be expected to have the following effects by providing the temperature-sensitive deformable member made of a shape memory alloy around the electrode plug.

(1) There is no possibility that the hot water storage tank will be corroded or damaged before the user notices it, and eventually it will lead to an accident such as water leakage.

(2) Removing the anticorrosion device eliminates the need for troublesome maintenance work for scale reduction.

(3) When cold, the temperature-sensitive deformable member is in a non-deformed state, which does not hinder the workability of assembling the hot water storage tank of the cathodic protection device.

(4) Since the temperature-sensitive deformable member is deformed when heated, it does not hinder the flow of the anticorrosion current from the electrode wire. (Anti-corrosion current is especially required at high temperatures.)

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram of an anticorrosion device for a hot water storage tank according to an embodiment of the present invention, FIG. 2 is a perspective view of a temperature-sensitive deformable member of the anticorrosion device of the same embodiment in a cold state, and FIG. 3 is another embodiment. FIG. 4 is a cross-sectional configuration diagram of an example anticorrosion device, FIG. 4 is an overall cross-sectional configuration diagram of a conventional hot water storage tank, and FIG. 5 is a cross-sectional configuration diagram of the conventional anticorrosion device. 6 ... Temperature-sensitive deformation member, 10 ... Hot water storage tank, 11 ... Electrode plug, 12 ... Electrode wire.

Claims (1)

[Claims] 1. A temperature-sensitive deformable member made of a shape memory alloy is disposed so as to cover the periphery of an electrode wire facing the inside of a hot water storage tank of an electrode plug so as to be electrically insulated, and the temperature-sensitive deformed according to a change in hot water temperature. Corrosion preventive device for hot water storage tanks whose members are deformed and restored when cold.