JPS6124840Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved structure of the previously registered Utility Model Publication No. 49-12938. In this prior design, in order to removably suspend the sacrificial anode rod in the vertical center position of the hot water storage tank, a hot water sampling pipe was screwed into the socket that was fixed in the center of the upper surface of the tank and penetrated vertically. This water heater tank has a structure in which a sacrificial anode rod is screwed onto the lower end of the part of the hot water sampling pipe that extends into the tank, and a water hole is opened in the extended part to communicate the inside and outside of the pipe. However, this structure requires special machining of the molten metal sampling pipe, making the processing cost extremely high.In addition, in order to facilitate the machining, brass must actually be used as the material for the molten metal sampling pipe. Since a large potential difference is generated, the portion of the sacrificial anode rod that connects to the hot water sampling pipe is subject to large wear and tear, and therefore the anticorrosion effect of the anode rod is reduced accordingly.

The present invention aims to improve the above-mentioned drawbacks, and its detailed structure is as shown in the accompanying drawings. In the figure, reference numeral 7 denotes a hot water storage tank, which is made of a plate of a metal with excellent corrosion resistance, such as stainless steel, or a so-called enamel plate made by baking a glass material with excellent corrosion resistance on the inner surface of an iron plate. Although not shown, an outer box is installed around the outer periphery of the tank 7 with a heat insulating material interposed therebetween. A metal socket 4 is fitted and fixed into an opening at the center of the upper surface of the tank 7, and a thread is cut into the inner surface of the metal socket 4. A thread on the outer surface of the lower end of the hot water sampling pipe 3 is screwed into the inner thread of the socket 4, and a thread 3a is also cut on the outer surface of the upper end of the hot water sampling pipe 3. External piping is screwed and connected to this upper end screw.
Although not shown, a rubber ring is fitted around the outer periphery of the intermediate portion of the hot water sampling pipe 3, and this is fitted around the hole in the lid of the outer box.

In order to electrically and mechanically connect the hot water sampling pipe 3 and the sacrificial anode rod 6 arranged vertically in the center of the tank 7, the upper end of the connecting rod 2 is first attached to the inner surface of the lower end of the hot water sampling pipe 3. It is welded, and its lower end is detachably connected to the anode rod 6. That is, the anode rod 6 is made of iron core wire 6a.
The upper end of the anode rod 6, which protrudes from the upper end surface, is inserted into the tubular connecting fitting 5 side by side with the lower end of the connecting rod 2, and these are pressed against each other and fixed by tightening the screw 5a. .

As mentioned above, apart from threading the outer periphery of the upper and lower ends, the only processing performed on the hot water sampling pipe 3 is to weld the connecting rod 2 to the inner surface of the lower end. It is necessary to extend it into the tank, cut a screw into the inner circumferential surface of the lower end to screw the outer circumference of the upper end of the sacrificial anode rod, and drill a large number of water holes for communication between the inside and outside along the circumference of the extended part. In other words, it is easy to process, so there is no need to use a material that is particularly easy to process, such as brass, and it is possible to use stainless steel, which is the same material as the tank 7.
Therefore, unlike brass, a large potential difference is not generated between the anode rod 6 and the sacrificial anode rod is less consumed due to the hot water sampling pipe. Furthermore, since there is almost no extension of the hot water sampling pipe 3 into the tank, the area of contact with the hot water in the tank is small, which also reduces wear on the sacrificial anode rod. It is also desirable to use stainless steel for the socket 4, the connecting rod 2, and the connecting fitting 5 as well.

To replace the sacrificial anode rod 6, the upper end 3a of the hot water sampling pipe 3 protrudes above the outer box of the tank 7, so grasp this part, rotate the pipe 3, and remove the lower end. When removed from the socket 4, the entire body including the connecting fitting 5 and the anode rod 6 can be easily pulled out upward. Therefore, since the inside of the connecting fitting 5 can be easily attached and detached, the anode rod 6 can be easily replaced.
After replacement, it can be easily reinstalled as shown in the drawing by performing the reverse operation of the above-mentioned removal.

According to the present invention, processing is easy without requiring processing such as drilling internal and external communication holes in the hot water sampling pipe.
Not only can processing costs be reduced, but because it is easy to process, it is possible to use stainless steel, which is the same quality as the tank, so the consumption of the sacrificial anode rod can be lower than when using brass, etc. Furthermore, by eliminating the extension of the hot water sampling pipe into the tank, wear and tear on the anode rod can be further reduced, and there is no need to cut a thread on the outer periphery of the upper end of the anode rod. Therefore, there are effects such as being able to reduce processing costs.

[Brief explanation of the drawing]

The drawing is an elevational view showing the interior of the tank according to the present invention. 2... Connection rod, 3... Hot water sampling pipe, 4... Socket, 5... Connection fitting, 6... Sacrificial anode rod, 7...
Hot water storage tank.

Claims (1)

[Scope of utility model registration request] The lower outer surface of the hot water sampling pipe is screwed onto the inner surface of the socket fixedly installed in the center of the upper surface of the hot water storage tank, the upper end of the connecting rod is welded to the lower inner surface of the hot water sampling pipe, and the lower end of the connecting rod and the sacrificial A water heater tank with a sacrificial anode rod, in which the core wire protruding from the upper end of the anode rod is removably connected to the anode rod using a connecting fitting.