JPS5932590Y2 - Large iron electrode device for heat exchangers - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a large iron electrode device frequently used in heat exchangers, which is attached to the inner surface of the ice chamber wall of heat exchangers to prevent corrosion of cooling pipes, tube sheets, etc.

Conventionally, as this type of iron electrode device, an iron electrode device as shown in a longitudinal sectional side view in FIG. 1 is known.

The iron electrode device shown in FIG. The core frame 8 has a structure in which a soluble iron electrode 10 is screwed into a male threaded portion 9 formed on the core frame 8.

Further, the iron electrode 10 has a center hole 12 formed at least in part in the female threaded part 11 which is screwed into the male threaded part 9, and the end 10A facing the ice chamber wall 1 is connected to the flange 1 of the core frame 8.
3 through the gasket 14, while an insoluble metal ring 15 having an outer diameter slightly larger than the inner diameter of the center hole 12 is brought into contact with the other end 10B, and the ring 15 is also attached with an insoluble metal bolt 16. It is fixed to the core frame 8 by fixing it to the core frame 8.

In a conventional iron electrode device having such a structure, iron ions are generated by passing an electric current through the iron electrode 10 through the core frame 8, and a heat exchanger such as a cooling tube and tube plate made of prepared alloy is used. However, as shown by the imaginary line in Fig. 1, the iron electrode 10 gradually thins, especially at the ends, which thin out quickly and wear out unevenly. However, if a part of the core frame 8 is exposed and the cooling water in the water chamber enters the center hole 12 of the iron electrode 10, conductivity may be poor or a part of the iron electrode 10 may be missing. The iron electrode loses its stable function as a cathodic protection electrode relatively early, and since the iron electrode itself is integrally molded, it becomes difficult to handle if it becomes large. The problem was that there was a limit to this.

Based on the above-mentioned viewpoints, this invention provides an iron electrode device that is durable, does not wear out unevenly, and is suitable for use in heat exchangers that can be made larger. To prevent uneven wear, a member having a current shielding function and having a size that covers or larger than these end faces is provided closely on each of both end faces of the
Furthermore, the iron electrode is divided into a plurality of pieces in the axial direction and made into a laminated iron electrode, which is stacked on top of each other, thereby making it possible to form a dog-shaped iron electrode.

Next, the iron electrode device of this invention will be explained using an actual case with reference to the drawings.

FIG. 2 shows a longitudinal sectional side view of the iron electrode device of this invention attached to the ice chamber wall 1 of a heat exchanger.

As shown, a support fitting 18 having a flange 17
The inner half of the icebox is fitted into the hole 19 of the icebox wall 1 and fixed with a plurality of insulating bolts 20.

Prior to attachment to the hole 19 in the ice chamber wall 1, the support fitting 18 has one end of a core frame 21 made of metal such as titanium, stainless steel, Kunkle, nickel, and niobium, which is more durable than iron, concentrically screwed. It's a dress.

The support fitting 1B to which the core frame 21 is attached has a hard rubber lining 22 with a thickness of about 38 on the entire outer surface, and at this time, the neck 21A of the core frame 21 is also covered with the hard rubber lining 22.
It should be covered with.

The hard rubber lining 22 also covers the inner surface of the bolt through hole 23 formed in the flange 17, and the insulating bolt 20
Reliable insulation is achieved by the insulation coating 24.

Further, a rubber lining 25 is provided from the inner peripheral surface of the hole 19 to the contact surface of the flange 17 and the entire inner surface of the ice chamber wall 1.

Further, an insulating packing 26 having a thickness of about 3 cm is interposed between the flange 17 and the ice chamber wall 1.

The support fitting 18 with the exposed box 27 attached to its outer end face is made of stainless steel, for example, and passes current from an external power source to the core frame 21, serving as a power supply terminal to the iron electrode 28 attached to the core frame 21.

The iron electrode 28 is made up of a plurality of divided pieces 28A that are divided into a plurality of pieces in the axial direction and stacked on top of each other, and in this embodiment, it is made up of four divided pieces.

Electrical contact between the core frame 21 and each divided piece 28A of the iron electrode 28 is achieved by screwing the male threaded portion 29 of the core frame 21 into a female screw hole 30 provided at the center of each divided piece 28A. The entire surface of the piece 28A, including its female threaded hole 30, is painted with a conductive resin paint, and the male threaded portion 29 of the core frame 21 is also painted with the same conductive resin paint to ensure good electrical contact. .

In addition, an insulating plate 31, which is a member having an outer diameter larger than the outer diameter of the iron electrode 28 and has a current shielding function, is placed in close contact with the end face A (d) of the iron electrode 28 facing the ice chamber wall 1. It is.

The insulating plate 31 has a cutout step 31A in the part facing the hole 19, and when it comes into contact with the icebox wall 1, the cutout step 31A is filled with a waterproof adhesive 32 such as silicone rubber, and a watertight seal is applied. I'm sure.

On the other hand, on the opposite end surface B of the iron electrode 28, a current shielding plate 33, which is a member having a current shielding function and having an outer diameter larger than that of the iron electrode itself, is placed in close contact. be.

The current drawing board 33 has a center hole 34 that fits into the core frame 21.
It is a plate material made of hard vinyl, fiber reinforced resin, or a metal more durable than steel, and after it is fitted into the core frame 21, it is prevented from loosening by the washer 35, nut 36, lock nut 37, etc. Iron electrode 28
It is pressed against the end surface B of.

The washer 35, nut 36, lock nut 37, and the like are all made of metal, which is more durable than iron, like the core frame 21.

Further, on one side of each of the divided pieces 28A, a recess 38 with a depth of about 10 holes is provided to facilitate engagement of a tool during disassembly.
There are 2 or 4 holes.

Furthermore, tap holes 39 are provided at several locations on the outer circumferential surface to which jigs are attached during processing and assembly.

In addition, the installation of bolts 40 for fixing the exposed box 27 to the support fitting 18 and the attachment of the core frame 21 to the support fitting 18
When screwing together, conductive resin paint shall be applied to all threaded surfaces.

Further, to attach the insulating bolts 20 and 40, an insulating washer 41 made of epoxy glass cloth or the like, or an insulating plate 42 made of fabric-filled Bakelite or the like is used.

In the iron electrode device of this invention having the above-mentioned configuration,
During use, the iron electrode 28 melts almost uniformly from the outer circumferential surface and gradually becomes smaller in diameter. During this time, unlike conventional iron electrodes, the core frame 21
Water does not enter between the steel electrode 28 and the iron electrode 28, and a stable anti-corrosion function is always exhibited.

The wear limit surface of the iron electrode 28 is the surface corresponding to the outer diameter of the washer 35 that tightens the current plate 33 (shown by the imaginary line in FIG. 2), and when it wears out to this point, the lock nut 37. Natsu 36. Washer 35. Then, remove the current drawing board 33 from the core frame 21, pull out each worn-out divided piece 28A using the recess 38, and replace it with a new divided piece 28A.
It would be good to install A.

In this embodiment, each divided piece 28A is screwed onto the core frame 21, but other known mechanical attachment means or attachment using a conductive adhesive may be used.

By dividing the iron electrode 28 into a plurality of pieces and stacking them in a laminated form in this manner, the iron electrode is not only easy to handle, but also can be made into a large-sized electrode with a large capacity.

As is clear from the above explanation, according to the iron electrode device of this invention, the iron electrode dissolves almost uniformly from the external surface, so the service life is significantly shortened compared to the conventional iron electrode device, which dissolves extremely locally. Since it can be made longer and the iron electrode can be divided into multiple pieces that are easier to handle, it has excellent practical effects such as making it possible to make iron electrodes that are much larger than conventional ones. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view showing a conventional iron electrode device, and FIG. 2 is a longitudinal sectional side view showing an embodiment of the iron electrode device of this invention. In the drawings, 1... Water chamber wall, 17...
・Flange, 18... Support metal fittings, 19...
...JL, 20...Insulation bolt, 21...
... Core frame, 28 ... Iron electrode, 28A ...
Split piece, 29...Male thread part, 30...
Female threaded portion, 31... Insulating plate as a member having a current shielding function, 33... Current shield drawing board as a member having a current shielding function, 35... ...Washer, A, B...End face.

Claims (1)

[Scope of utility model registration request] In a frequently used iron electrode device for heat exchangers, in which a soluble iron electrode having a center hole is fitted and fixed to an insoluble metal core frame insulated and protruding from the inner surface of the ice chamber wall on the cooling water inlet side of the heat exchanger. ,
A member having a current shielding function that is large enough to cover these end faces or thicker than that is provided closely on each of both end faces of the iron electrode, and the iron electrode is arranged in a plurality of pieces in the axial direction. A large iron electrode device frequently used in heat exchangers, characterized by a laminated iron electrode that is divided into layers and stacked on top of each other.