JPH0315547Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The invention relates to an anode rod for preventing corrosion in hot water tanks. Specifically, the invention relates to an anode rod for corrosion protection in hot water tanks that is easy to manufacture and has excellent durability. Regarding the anode rod.

BACKGROUND ART Conventionally, in industrial and domestic hot water tanks, anticorrosive anode rods are usually immersed in hot water to prevent corrosion. This anti-corrosion anode rod is usually coated around the core with a sacrificial anode metal made of magnesium, aluminum, zinc, or an alloy based on these, which has a more active corrosion potential than iron or carbon steel, which is the material of the hot water tank. By immersing this sacrificial anode in hot water in a hot water tank, the sacrificial anode is caused to preferentially react with the corrosive substances in the hot water, and by suppressing the reaction with the tank material, prevents corrosion.

Such a conventionally used anode rod for anticorrosion of a hot water tank and its improvement are described in Japanese Utility Model Application Publication No. 62-51173.

Conventionally, anti-corrosion anode rods are as shown in Figure 3.
Consisting of a substantially cylindrical plug 1 made of carbon steel and an anode rod main body 2, the plug has a through hole 4 in its head 3, and this through hole extends from the lower end surface of the plug to the inside of the body 5. It is formed to communicate with an inner hole 6 provided therein, and a female thread is formed on the inner hole wall, and a male thread is formed on the outer circumferential surface 7 of the body. On the other hand, in the anode rod main body 2, the core body 8 is exposed at the inner end, and in the remaining part, the sacrificial anode metal is coated around the core body to form the sacrificial anode 9. A male thread is formed at the inner end to threadably engage the inner hole. Thus, the core at the inner end of the anode rod body is inserted into the through hole of the plug to expose its tip from the plug, and the inner end of the anode rod body is screwed into the inner hole of the plug, and , the anode rod body is fixed to the plug by welding the exposed core to the plug.

As shown in FIG. 4, such an anode rod is constructed by screwing the plug 1 into a socket 11 appropriately attached to a hot water tank 10 using a screw on the outer circumferential surface of the body, and placing the anode rod main body 2 in hot water 12. It is used by soaking it in.

However, such conventional anode rods require time and effort to weld the plug and the anode rod core during the manufacturing process, and the sacrificial anode end of the anode rod main body and When the sacrificial anode metal is eluted to some extent at the threaded engagement part with the inner hole of the plug, hot water enters the inside of the plug through the gap formed in the threaded engagement part.
If there is a slight gap in the weld, press it out from the plug. Moreover, in manufacturing such conventional anode rods, not only does the welding require time and expense, but even if all units are subjected to a pressure resistance test after manufacturing, they are susceptible to damage due to subsequent impact, etc.
There is also a risk of damage to the weld.

Therefore, as shown in FIG. 5, in the above-mentioned Japanese Utility Model Application Publication No. 62-51173, the inner end portion of the anode rod body 2 is screwed into the inner hole 6 of the body portion 5 of the plug 1, and An anode rod has been proposed in which the lower end 13 of the anode rod is caulked to the anode rod body. According to this anode rod, the plug does not have a through hole in its head 3;
Since welding to the core body 8 is not required, the manufacturing process is simplified and hot water is not forced out from the plug.

However, even with this anode rod, if the sacrificial anode at the caulked part of the lower end of the plug elutes due to long-term use and a gap is created between the sacrificial anode and the plug, hot water will enter the inside of the plug. In addition, the sacrificial anode will be eluted, and therefore,
Looseness easily occurs between the anode rod body and the plug.
As a result, it detaches from the plug.

Problems to be Solved by the Invention The present invention was made to solve the above-mentioned problems with the conventional anticorrosion anode rod for hot water tanks. The purpose of the present invention is to provide an anode rod with excellent corrosion resistance.

Means for Solving the Problems The anticorrosion anode rod according to the present invention includes a plug and an anode rod main body inserted into and fixed to the plug, and the plug has an inner hole extending from the lower end surface inside the body of the plug, The anode rod body has a threaded hole that continues to the inner hole, a core body is exposed at the inner end of the anode rod body, and a thread is formed in the core body to engage with the threaded hole in the plug body. Following the inner end, a sacrificial anode metal is coated around the core body to form a sacrificial anode, and the upper end of the sacrificial anode is fitted into the inner hole in the plug body.

The anticorrosive anode rod for a hot water tank according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the anticorrosion anode rod according to the present invention, which consists of a bottomed, substantially cylindrical plug 21 and an anode rod main body 31 inserted into and fixed therein. The plug consists of a head part 22 and a body part 23 formed integrally with the head part, and this body part has an inner hole 24 extending from the lower end surface inside the head part, and a screw thread provided with an internal thread. It has a hole 25.
Further, as described above, the outer circumferential surface of the body is provided with a male thread 26 for screwing the plug into a socket provided in the hot water tank.

On the other hand, the anode rod main body 31 has a core body 32 exposed at its inner end, and a male thread that engages with the screw hole 25 is formed on the core body.
Following this exposed core, a sacrificial anode metal is coated around the core to form a sacrificial anode 33. The inner end of this sacrificial anode is formed into a fitting portion 34 that fits into the inner hole 24 of the plug. The core body 32 is usually made of carbon steel, extends over a suitable length, and is coated with sacrificial anode metal around the entire length except for the exposed core body portion.

In the anticorrosion anode rod according to the present invention, the core body 32 exposed at the inner end of the anode rod body is engaged with the screw hole 25 of the plug, and the inner end of the sacrificial anode 33 is inserted into the inner hole 24 of the plug. By fitting, the anode rod body is fixed to the plug.

FIG. 2 shows another embodiment of the anti-corrosion anode rod according to the present invention, in which the lower end of the plug body 23 is formed into a thin cylindrical shape compared to the threaded body. The caulking portion 27 is formed in the anode rod main body 31 so that caulking can be performed.
Correspondingly, the lower end of the fitting portion 34 inserted into the inner hole 24 of the plug is formed with a step portion 35 having a small diameter.

In this anode rod, in addition to the exposed core 32 at the inner end of the anode rod main body being screwed into the screw hole 24 of the plug 21, the anode rod main body is attached to the caulking portion of the plug. 27 is caulked to the anode rod body, and the anode rod is fixed to the plug.

When using the anti-corrosion anode rod according to the present invention,
As described above, the plug is screwed into the socket provided in the hot water tank using the screw on the outer circumferential surface of the body of the plug, and the anode rod body is immersed in the hot water.

Effects of the Invention As described above, according to the anticorrosion anode rod of the present invention, the core body exposed at the inner end of the anode rod body is screwed into the screw hole inside the plug body, so that the anode Since the rod body is fixed to the plug,
Even during long-term use, there will be no contact failure between the anode rod body and the plug, or the anode rod body will not come off from the plug. That is, even if the sacrificial anode is finally eluted, the anode rod body remains fixed to the plug and has extremely high durability.

Furthermore, by caulking the lower end of the plug body to the anode rod body, the fitting part between the plug and the anode rod body is sealed watertight, so even during long-term use, the anode rod body will remain intact. is more firmly fixed to the plug.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts showing one embodiment of the anticorrosion anode rod according to the present invention, FIG. 2 is a sectional view of essential parts showing another embodiment of the anode rod for anticorrosion according to the invention, and FIG.
The figure is a cross-sectional view of a main part of a conventional anti-corrosion anode rod, FIG. 4 is a schematic cross-section of a hot water tank to which the anti-corrosion anode rod is attached, and FIG. 5 is a cross-sectional view of another conventional anode rod for anti-corrosion. FIG. 1... Plug, 2... Anode rod body, 4... Through hole, 6... Inner hole, 8... Core body, 9... Sacrificial anode,
21...Plug, 22...Head, 23...Body,
24...Inner hole, 25...Screw hole, 26...Male thread, 27...Caulking part, 31...Anode rod body, 3
2...Core body, 33...Sacrificial anode, 34...Fitting part, 35...Step part.

Claims (1)

[Claims for Utility Model Registration] (1) Consisting of a plug and an anode rod body inserted into the plug and fixed therein, the plug has an inner hole extending from the lower end face inside the body thereof, and an inner hole continuing from the inner hole. The anode rod body has a core body exposed at its inner end, and a thread is formed in the core body to engage with the screw hole in the plug body, and the anode rod main body has a core body exposed at its inner end, and a thread is formed in the core body to engage with the screw hole in the plug body. A corrosion-protective anode rod, characterized in that a sacrificial anode metal is coated around a core body to form a sacrificial anode, and an upper end of the sacrificial anode is fitted into an inner hole in the plug body. (2) Consisting of a plug and an anode rod body inserted into and fixed therein, the plug has an inner hole extending from the lower end surface inside the body, and a screw hole continuing to this inner hole, and the anode rod main body is inserted into the plug and fixed. The rod body has a core exposed at its inner end, which core is threaded to engage a threaded hole in the plug body, and following this inner end, a sacrificial anode is placed around the core. Metal is coated to form a sacrificial anode, the upper end of the sacrificial anode is fitted into a bore in the plug body, and the plug is crimped onto the sacrificial anode at its lower end in the body. An anti-corrosion anode rod characterized by: