JPH03249188A - Structure for mounting corrosion protective electrode - Google Patents

Abstract

PURPOSE:To mount an electrode to an object to be protected without subjecting the mounting hole of this object to screwing and welding by liquid-tightly sealing a holding member from the outside by means of an elastic sealing material at the time of inserting the electrode via the holding member into the mounting hole of the object. CONSTITUTION:The 1st holding member 30 is inserted into the sealing member 40 and the bar-shaped corrosion protective electrode 20 is inserted into the through-hole 35 of the 1st holding member 30. The electrode holding member 70 is fitted to the electrode 20. The sealing member 40 is pressed into the mounting hole of a pipe joint 10 which is the object to be protected and a supporting member 84 is wound around the pipe joint 10 and is fixed by screws 83 to a flange part 41a. Suitable tension is applied to the bearing member 84 by means of a bolt 81 to fix the sealing member 40. The 2nd holding member 50 is then screwed to the 1st holding member 30 and a metallic sleeve 41 is expanded to bring the elastic seal 46 into pressurized contact with the pipe joint 10. Further, the pressing member 60 is screwed to the 2nd holding member 50 to press the electrode holding member 70 and to securely hold the electrode 20. The electrode 20 is extremely easily mounted to the pipe joint 20 and is thereby protected without requiring the threading of the mounting hole and without requiring welding.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to the structure of attaching a corrosion protection electrode to an object to be protected, which is used for electrolytic protection of the inner surface of a steel pipe, the inner surface of a steel water tank, or the like.

(Prior Art) Metal pipes such as steel pipes and metal water tanks are electrochemically corroded over time by liquids such as water that flow through or are stored inside. In order to prevent such corrosion, electrodes are inserted into the object to be protected, such as steel pipes, and current is passed through the liquid inside to prevent electrochemical corrosion of the object. . The electrode inserted into the object to be protected against corrosion is
One end portion is located outside the corrosion-protected object so that it is energized from the outside. Therefore, the electrode needs to be attached to the object to be protected from corrosion while being insulated from the object and sealed in a liquid-tight manner.

For example, Japanese Patent Publication No. 57-53869 discloses a structure for attaching a corrosion-protective electrode to an object to be protected from corrosion in an insulated and liquid-tight manner. As shown in FIG. 4, the structure of the anti-corrosion electrode attachment includes a cylindrical holding member 91 which is attached to the object to be anti-corrosioned by screw connection. The inner peripheral surface of the holding member 91 on the inner back side is a tapered surface 92 that gradually decreases in diameter as it approaches the inner back side, and an electrode insertion hole is provided inside the tapered surface 92 at the axial center. A rubber gasket 93 is fitted therein. Inside the holding member 91, there is an insulating member 9 made of mica glass having an electrode insertion hole in the shaft center.
4 is screwed into the anti-corrosion object from the outside and fixed in contact with the rubber packing 93.

The holding member 91 is connected to the corrosion-protected object while being screwed into the corrosion-protected object. Then, by inserting the electrode 20 into the electrode insertion hole of the rubber packing 93 fitted into the holding member 91 and screwing the insulating member 94 into the holding member 91, the rubber packing 93 is compressed and the diameter of the electrode 20 is reduced.
is fixed. At this time, the outer and inner sides of the holding member 91 are simultaneously sealed in a liquid-tight manner by compression of the rubber packing 93. With such a configuration, the rubber gasket 93
Since the electrode 20 is held elastically by the rubber packing 93, the electrode holding position relative to the rubber packing 93 can be easily changed by sliding the electrode 20 inside the rubber packing 93. Therefore, it is easy to adjust the length of the electrode protruding from the holding member 91 fixed to the object to be protected from corrosion, and the surface area of the electrode corresponding to the area to be protected from corrosion is ensured within the object to be protected from corrosion.

(Problem to be Solved by the Invention) In terms of structure, such an electrode attachment requires a cylindrical holding member 91.
is attached to the object to be protected against corrosion by screw connection. Therefore, when attaching the electrode 20 to a corrosion-protected object, it is necessary not only to open a hole in the object, but also to install a female thread on the inner circumferential surface of the hole that is screwed into the male thread of the holding member 91. need to be threaded. Therefore, when installing the electrode 20, hole machining and screw machining are required.
It takes a lot of work.

In contrast to such a structure, an electrode mounting structure in which a cylindrical holding member 91 is integrally protruded from the outer circumferential surface of the object to be protected against corrosion is disclosed in, for example, Japanese Utility Model Application No. 56-87463. . However, this electrode mounting structure does not include the holding member 91.
Since it is attached to the object to be protected against corrosion by welding, the welding work itself is complicated.

In addition, in any of the conventional techniques described above, in order to ensure corrosion protection, the complicated work of connecting the cathode to the object to be protected against corrosion, such as a steel pipe, is required for each electrode 20 or for each insulation section. Electrode installation requires a long time.

Moreover, since parts for the cathode are required, there is also the problem that the cost required for installation increases.

Furthermore, the holding member is in a state of protruding radially or the like with respect to an object to be protected from corrosion such as a steel pipe. Therefore, it does not have sufficient strength against the lateral load, which is a load perpendicular to the longitudinal direction, and the liquid tightness to the object to be protected against corrosion may be reduced, or the object to be protected against corrosion or the holding member There is a risk of causing destruction, etc.

The present invention solves the above-mentioned conventional problems, and its purpose is to make it extremely easy to attach electrodes to objects to be protected from corrosion without requiring laborious work such as screw machining or welding. A possible corrosion-proof electrode installation is to provide a structure.

Another object of the present invention is to provide a corrosion-resistant electrode mounting structure that allows cathode connections to be made very easily since no cathode parts are required, and that is also strongly supported against lateral loads.

(Means for Solving the Problems) The structure of the anti-corrosion electrode attachment of the present invention is that the attachment provided on the object to be anti-corrosion is loosely fitted into a hole, and each end is connected to the inside and outside of the object to be anti-corrosion. a cylindrical first holding member located, a sealing member installed between the first holding member and the mounting hole to provide a fluid-tight seal between the two; and a sealing member located outside the object to be protected against corrosion. a cylindrical second holding member fitted into the first holding member such that an end portion of the first holding member is housed therein; a cylindrical pressing member that is fitted to face the first holding member to form a space between the opposing surface of the first holding member; a rod-shaped electrode that is inserted through the pressing member and the first holding member; The electrode is positioned in a space between the pressing member and the first holding member so as to be inserted thereinto and in contact with both, and an electrode holding member that holds the electrode by elastic force, and an electrode holding member that holds the electrode by elastic force, a band-shaped support member linked to the seal member to fixedly support the seal member in an electrically connected state;
The above object is thereby achieved.

(Example) The present invention will be described below with reference to its embodiments.

As shown in FIGS. 1 and 2, the corrosion-protective electrode mounting structure of the present invention is employed, for example, when fixing an electrode 20 for cathodic protection to a pipe joint 10 as an object to be protected from corrosion. The pipe fitting IO has a mounting hole 11 in a part thereof, through which the electrode 20 is inserted. The mounting hole 11 has a circular cross section, and its inner peripheral surface is not threaded.

To attach the pipe joint 10, a cylindrical first holding member 30 is loosely inserted into the hole 11, and the first holding member 30 is inserted into the hole 11.
However, the fitting of the pipe fitting 10 is supported within the hole 11 by the sealing member 40. The first holding member is made of a hard material such as metal, plastic, or ceramic.

A male threaded portion 31 is provided on the outer peripheral surface of the end portion of the first holding member 30 located outside the pipe joint 10, and a cylindrical second holding member 50 is externally fitted onto the male threaded portion 31. A portion continuous to the male threaded portion 31 is a straight pipe portion 32 having an outer circumferential surface with a constant outer diameter, and an end portion continuous to the straight pipe portion 32 is located within the pipe joint IO. The end portion thereof becomes a tapered pressing portion 33 whose diameter gradually increases as the distance from the straight tube portion 32 increases. The pressing part 33 is
Its maximum outer diameter is slightly smaller than the inner diameter of the hole 11 when attached to the pipe fitting IO.
It can be easily inserted from the outside.

A through hole 35 through which the electrode 20 is inserted is formed in the axial center of the first holding member 30, and the inner diameter of the through hole 35 is slightly thicker than the outer diameter of the electrode 20. .The first
The end surface of the end of the holding member 30 located on the outside of the pipe joint 10 is a holding surface 34 in the shape of a conical recess.

The seal member 40 supporting the first holding member 30 includes a pressing portion 33 located within the pipe fitting IO of the first holding member 30 and a straight pipe that is continuous with the pressing portion 33 and partially extends from the pipe fitting IO. It has a cylindrical metal sleeve 41 that is externally fitted to the portion 32, and a cylindrical elastic seal 46 that is externally fitted to the metal sleeve 41. A seven-lung portion 41a is provided at the end of the metal sleeve 41 located outside the pipe joint 1o. The outer diameter of the flange portion 41a is determined by the mounting hole 11.
It is sufficiently larger than the inner diameter of. Further, an annular groove 41b communicating with the inner circumferential surface is formed on the inner circumferential side of the upper end surface of the flange portion 41a.

An O-ring 45 is fitted into the annular groove 41b, and the O-ring 45 is fitted onto the straight pipe portion 32 of the first holding member 3o and is pressed against the straight pipe portion 32 in a liquid-tight manner. ing.

At the end of the metal sleeve 41 opposite to the end where the flange portion 41a is provided, a plurality of slits 41s are provided at appropriate intervals in the circumferential direction, extending from the distal end side in the axial direction. The end portion is therefore expandable.

The portion of the metal sleeve 41 excluding the flange portion 41a is
A cylindrical elastic seal 46 is fitted onto the outside. The elastic seal 46 is made of an elastic body such as rubber having a predetermined thickness, and a flange portion 46a that comes into contact with the flange portion 41a of the metal sleeve 41 is provided at the end located outside the pipe joint 10. It is being The outer diameter of the elastic seal 46 excluding the flange portion 46a is the same as or slightly smaller than the inner diameter of the hole 11 for mounting.

Further, its axial length is slightly longer than the length of the mounting hole 11 in the axial direction.

The elastic seal 46 has a flange portion 46a and a pipe fitting l.
An annular support member 47 made of a conductive metal or the like is fitted onto the outside of the support member 47 so as to be located between the support member 47 and the outer peripheral surface of the support member O. The annular support member 47 has an outer diameter approximately equal to the outer diameter of the flange portion 46a of the elastic seal 46 in the seal member 40, and an inner diameter approximately equal to the outer diameter of the cylindrical portion of the elastic seal 46 excluding the flange portion 46a. .

The elastic seal 46 is compressed by the inner circumferential surface of the hole 11 and the metal sleeve 41 when the pipe joint 10 is attached, and is in liquid-tight pressure contact with the outer circumferential surface of the metal sleeve 41. The opening between the two is sealed in a liquid-tight manner.

The first holding member 30 is inserted through the sealing member 40 so that a portion of the pressing portion 33 and a portion of the straight pipe portion 32 extend from each end of the sealing member 40, respectively. A cylindrical second holding member 50 is screwed into the male threaded portion 31 continuous to the straight pipe portion 32 . The second holding member 50 is made of a hard material such as metal, and a female threaded portion 51a that is screwed into the male threaded portion 31 of the first holding member 30 is provided on a part of its inner peripheral surface. There is. The second holding member 50 is screwed onto the first holding member 30 and abuts against the seven flange portions 41a of the metal sleeve 4I of the sealing member 40 via washers 48. The outer peripheral surface of the second holding member 50 has a square shape so that a tightening tool such as a spanner can be engaged therewith. Second holding member 5
The female threaded portion 51a provided on the inner circumferential surface of the second holding member 50 is provided only in a portion closer to the pipe fitting 10 than the center portion where an electrode holding member 70 (to be described later) is located, and The inner circumferential surface of the side end portion is a smooth portion 51c without a female screw portion. This smooth portion 51c helps shorten the screwing operation when screwing the first holding member 50.

The female threaded portion 51a of the second holding member 50 is connected to the first holding member 3.
0, the male threaded portion 31 of the first holding member 30 is located within the second holding member 50,
The holding surface 34 of the first holding member 30 is connected to the second holding member 50.
It is located approximately in the center of

A female threaded portion 51b having a diameter different from that of the female threaded portion 51a is formed at the end of the inner peripheral surface of the second holding member 50 screwed into the first holding member 30 on the side away from the pipe joint 10. At the end of the second holding member 50 on the female threaded portion 5Ib side,
A cylindrical pressing member 60 having a slightly larger diameter than the first holding member 30 is screwed together. The pressing member 60, like the first holding member 30, is made of a hard material such as metal, plastic, or ceramic. A male threaded portion 62 is provided on the outer peripheral surface of the pressing member 60, and the male threaded portion 62 is screwed into the female threaded portion 51b of the second holding member 50.
One end extends from the second holding member 50, and the end surface at the other end is the second holding member 50.
It faces the holding surface 34 of the first holding member 30 that is fitted into the holding member 30 .

A flange-shaped nut portion 61 is provided at the end of the pressing member 60 extending from the second holding member 50 . The outer peripheral surface of the nut portion 61 has a square shape so that a tightening tool such as a spanner can be engaged therewith. Further, a round screw 61a serving as a cathode connection terminal is screwed into the upper surface of the nut portion 61.

A through hole 63 through which the electrode 20 is inserted is formed in the axial center of the pressing member 60, and the inner diameter of the through hole 63 is slightly larger than the outer diameter of the electrode 20. Part 6
0, the end surface of the first holding member 30 facing the holding surface 34 is a tapered suppressing surface 64 that is concave and concave, symmetrical to the holding surface 34. Therefore, a space is formed between the tapered holding surface 34 of the first holding member 30 and the pressing surface 64.

An electrode holding member 70 is disposed within the second holding member 50 so as to be located in a space between the tapered holding surface 34 and the tapered pressing surface 64. The electrode holding member 70
For example, fluororesin such as Teflon, 5BRS EP
It is made of an elastic insulating material such as a rubber-based material such as DM. A through hole 71 into which the rod-shaped electrode 20 is inserted is provided in the axial center of the electrode holding member 70 . The through hole 71
The inner diameter of the electrode 20 is the same as or slightly smaller than the outer diameter of the electrode 20.

A rod-shaped electrode 20 is inserted into the through hole 71 of the electrode holding member 70 , and a substantially central portion of the electrode 20 is inserted into the through hole 71 of the electrode holding member 70 .
It is held by an elastic force of 0. The electrode 20 has a first
Inside the holding member 300 through hole 35 and the second holding member 600
They are inserted through the through holes 63, and each end extends from the first holding member 30 and the second holding member 60, respectively.

The electrode 20 is made of a corrosion-resistant material such as titanium plated with platinum, and its outer diameter is usually 0.5
It is about ~3.0-. The electrode 20 is covered with an insulating tube made of fluorine resin or the like.

Note that when the first holding member 30 and the pressing member 60 are both made of an insulating material, the second holding member 50 and the electrode 20 are in an insulated state even if the insulating tinib coating is not provided.

As shown in FIG. 3, the electrode holding member 70 has a straight portion 72 having a constant outer diameter at its center in the axial direction. The straight portion 72 is connected to tapered portions 73 and 74, each of which has an outer diameter that gradually decreases as the distance from the straight portion 72 increases.

The tapered portion 73 located on the side of the first holding member 30 is
It faces the tapered holding surface 34 provided on the inner circumferential surface of the first holding member 30, and the inclination angle of the outer circumferential surface of the tapered portion 73 with respect to the axis is the axis of the holding surface 34 of the first holding member 30. The angle of inclination to the heart is slightly larger. The tapered portion 74 located on the pressing member 60 side is opposed to the tapered pressing surface 64 of the pressing member 60, and the inclination angle of its outer peripheral surface with respect to the axis is also greater than the inclination angle of the pressing surface 64 with respect to the axis. is also slightly larger.

The fitting 10 is installed using the sealing member 40 attached to the hole 11.
is fixedly supported by a band-shaped support member 84, as shown in FIGS. 1 and 2. The support member 84
is formed into a flexible band shape made of conductive material. The supporting member 84 is wound around the pipe joint 10, and each end thereof is fixed to the flange portion 41a of the sealing member 40 with screws 83 and 83. The center portion of the support member 84 faces the opposite side of the hole 11 for mounting in the pipe joint 10, and the bolt 81 is screwed into the opposing portion. The tip of the bolt 81 is in contact with the outer peripheral surface of the pipe joint IO. Therefore,
The band-shaped support member 84 is in contact with the outer peripheral surface position which is shifted by about 90 degrees from the mounting position of the electrode 20 in the pipe joint lO, and the contact portion between the support member 84 and the pipe joint lO are electrically connected. Then, by rotating the bolt 81, the tension of the support member 84 is adjusted, and by applying an appropriate tension to the band material 84, the seal member 40 is moved against the pipe joint lO by the support member 84. It is fixedly supported. In addition, the support member 8
Since 4 is conductive, the sealing member 40 and the pipe fitting 10
are electrically connected.

In the electrode attachment structure of the present invention having such a configuration, the electrode 20 is attached to the pipe joint 10 in the following manner.

First, a mounting hole 11 of a predetermined diameter is opened at a location on the pipe joint 10 where the electrode 20 is to be mounted.

On the other hand, the O-ring 45 is fitted into the annular groove 41b formed on the upper surface of the flange portion 41a of the seal member 40, and the annular support member 47 is fitted onto the elastic seal 46, and the first holding member is fitted inside. Push through 30. In this state, the electrode 20 is inserted into the through hole 35 of the first holding member 30. Then, the insertion hole 7 of the electrode holding member 70 is inserted into the electrode 20 portion extending from the holding surface 34 of the first holding member 30.
1 are fitted, and one tapered surface 73 of the electrode holding member 70 is opposed to the holding surface 34 of the first holding member 30. At this time, the length of the electrode 20 protruding from the end of the first holding member 3o opposite to the holding surface 34 is adjusted.

Next, the O ring 45 attached to the seal member 40
is fitted onto the straight pipe portion 32 of the first holding member 30 .

Then, the sealing member 40 is pushed into the mounting hole 11, the supporting member 84 is wrapped around the pipe joint 10, and each end thereof is fixed to the seven flange portions 41a of the sealing member 40 with screws 83. Further, a bolt 81 is screwed into the longitudinal center of the support member 84, and the tip of the bolt 81 is brought into contact with the outer circumferential surface of the pipe joint IO to apply appropriate tension to the support member 84. As a result, the seal member 4o is fixed to the pipe joint lO by the support member 84, and the flange portion 46a of the elastic seal 46 is pressed against the annular support member 47. As a result, the first holding member 30 is attached to the pipe joint 10 through the sealing member 40 in the hole 11 while holding the electrode 20 therein.

In this state, the female threaded portion 51a of the second holding member 50 is screwed into the male threaded portion 31 of the first holding member 30.

At this time, the second holding member 50 is screwed into the first holding member 30 by locking a tightening tool such as a wrench on the outer peripheral surface of the second holding member 50 to prevent the first holding member 30 from rotating. As a result, the distal end surface of the second holding member 50 is attached to the metal sleeve 4 of the sealing member 40 via the washer 48.
The flange portion 41a of the flange 1 is abutted.

Even after that, as the first holding member 30 does not rotate,
When the second holding member 50 is screwed into the first holding member 30, the first holding member 30 is screwed into the second holding member 50.
Move relatively within 0. As a result, the first holding member 3
The pressing portion 33 of No. 0 fits into the end portion of the metal sleeve 41 of the sealing member 40 in which the slit 41S is formed, and the diameter of the end portion is expanded. As a result, the elastic seal 46 is compressed between the outer peripheral surface of the end of the metal sleeve 41 and the inner peripheral surface of the mounting hole 11, and the distal end surface of the second holding member 50 is sealed via the washer 48. The member 40 is pressed against the flange portion 41a of the metal sleeve 41, and the flange portion 46a of the elastic seal 46 on the seal member 40 is pressed against the outer peripheral surface of the pipe joint IO. Thereby, the first holding member 30 and the second holding member 50 are fixed concentrically to the hole 11 when the pipe joint 10 is attached.

Moreover, since the elastic seal 46 in the seal member 40 is compressed, the attachment is possible between the inner peripheral surface of the hole 11 and the elastic seal 4.
6, and between the inner circumferential surface of the elastic seal 46 and the outer circumferential surface of the metal sleeve 41 are liquid-tightly sealed. Furthermore, an O-ring 45 provides a liquid-tight seal between the inner circumferential surface of the metal sleeve 41 and the outer circumferential surface of the first holding member 30 .

Therefore, when installing the pipe fitting 10, the hole 11 is the first holding member 3.
Except for the 00 through hole 35, it is sealed liquid-tight.

At this time, the elastic seal 46 of the seal member 40 is connected to the flange portion 41a of the metal sleeve 41 and the annular support member 47.
Since the pipe fittings 10 are tightened in a state of uniform pressure contact in the entire circumferential direction, the fitting 10 can be mounted on the inner circumferential surface of the hole 11 even if the outer circumferential surface of the pipe fitting 10 has a different curvature. The elastic seal 46 of the sealing member 40 ensures a liquid-tight seal between the tapered portion 41c of the metal sleeve 41 and the mounting hole 11.

When the second holding member 50 is screwed into the first holding member 30, a female screw portion 51b of the second holding member 50 on the opposite side to the screwing side portion of the first holding member 30 is provided at one end of the pressing member 60. The male threaded portion 62 is screwed together. Then, when the suppressing member 60 is screwed into the second holding member 50, the sealing member 40, which has been brought into electrical communication with the pipe joint IO via the supporting member 84, connects to the pressing member via the washer 48 and the second holding member 50. 60, and by making a cathode connection to the round screw 61a of the pressing member 60, the cathode connection work is easily completed. Further, when the pressing member 60 is screwed into the second holding member 50, the tapered pressing surface 64 of the pressing member 60 comes into contact with one tapered surface 74 of the electrode holding member 70.

Even after the pressing surface 64 comes into contact with the tapered surface 74, tighten the nut portion 61 of the pressing member 60 with a tool such as a spanner.
When the pressing member 60 is forcibly screwed into the second holding member 50, each tapered portion 73 and 74 of the electrode holding member 70
Then, the tapered holding surface 34 of the first holding member 30 and the tapered pressing surface 64 of the pressing member 60 are pressed into contact with each other. Thereby, the electrode holding member 70 is attached to the first holding member 3
The tapered holding surface 34 provided on the inner circumferential surface of the pressing member 60 and the tapered pressing surface 64 provided on the inner circumferential surface of the pressing member 60 compress it in the central axis direction.

Due to this compression, the elastic electrode holding member 70 applies an even stronger elastic force to the electrode 20 inserted through the insertion hole 71, thereby firmly holding the electrode 20.

The holding surface 34 of the first holding member 30 and the second holding member 60
The angle of each of the pressing surfaces 64 with respect to the central axis is preferably about 15 to 75 degrees so that a deforming force tends to be generated in the electrode holding member 70 toward the center thereof. In particular, 40
Preferably, the angle is about 50 degrees.

When the electrode holding member 70 is sufficiently compressed, the tapered surfaces 73 and 74 of the electrode holding member 70 are brought into contact with the holding surface 34 and the pressing surface 64 over their entire surfaces. As a result, even when the electrode holding member 70 is made of hard rubber, the electrode 20 inserted into the insertion hole 71 is firmly fixed within the electrode holding member 70. As a result, the tip of the electrode 20 is held inside the pipe joint 10, and between the holding surface 34 and the tapered surface 73 of the electrode holding member 70, the insertion hole 71 of the electrode holding member 70 and the electrode 20
A liquid-tight seal is formed between the two. Therefore, the internal space of the first holding member 30 is also sealed liquid-tightly.

At the same time, the metal second holding member 50 and the electrode 20 are electrically insulated by the electrode holding member 70. At this time, even if the electrode 20 is deformed, the electrode 20 and the second
A short circuit with the holding member 50 is prevented by forming the first holding member 30 and the pressing member 60 with an insulating material. Furthermore, when the first holding member 30 and the pressing member 60 are made of a conductive material such as metal, the electrode 20 and the first holding member 30 can be Short circuit with the pressing member 60 can be prevented. Similarly, a short circuit between the electrode 20 and the fitting lO is prevented by the elastic seal 46 in the first holding member 30 and the sealing member 40.

The insertion amount of the electrode 20 into the pipe fitting IO is changed by adjusting the insertion amount when inserting the proximal end of the electrode 20 into the insertion hole 71 of the electrode holding member 70. The insertion position of the tip of the electrode 20 inside can be arbitrarily adjusted. Even while the pressing member 60 is being screwed in,
This adjustment is possible before the electrode 20 is completely fixed.

In the above embodiment, the electrode is fixed to a pipe joint, but the present invention is not limited thereto, and can be applied to, for example, a case where the electrode is attached to a water tank, a hot water tank, or the like. Further, the structure itself is not limited to the above embodiment.

(Effects of the Invention) The structure of the anti-corrosion electrode mounting structure of the present invention is such that when attaching the electrode to the object to be protected against corrosion, there is no need to perform threading on the hole and no welding is required. Therefore, the electrodes can be attached very easily.

In addition, the first holding member not only holds the electrode holding member, but also functions as a processing jig for deforming the compression member for sealing with the tube body, and the second holding member also holds the electrode holding member. In addition, the first holding member functions as a member when fastened to the object to be protected from corrosion. Therefore, the number of parts is small, the structure is simple, and the manufacturing cost is low.

In addition, when the electrode holding member is pressed and deformed,
Since the structure is such that the electrode can be held reliably, the sealing performance between the electrode member and the electrode is improved, and furthermore, the length of the electrode protruding into the tube can be freely adjusted.

Furthermore, since the sealing member is fixed by the conductive band-shaped support member, the second holding member, etc. that protrudes from the corrosion-protected object is firmly fixed, improving liquid tightness. At the same time, there is no risk of damage. Further, since the supporting member is conductive, the corrosion-protected object and the sealing member are electrically connected through the supporting member, and the cathode connection work can be easily performed without using any cathode parts.

4. Figure 1 is a sectional view showing one embodiment of the structure of the electrode attachment of the present invention, Figure 2 is a front view showing the structure of the electrode attachment of the present invention, and Figure 3 is a diagram of the electrode holding member. The explanatory diagram, FIG. 4, is a sectional view of a conventional electrode holding member.

IO... Pipe joint (corrosion protection target), 20... Electrode, 3
0... First holding member, 33... Pressing surface, 34...
holding surface, 4o... compression member, 46... sealing member,
50... Second holding member, 60... Pressing member, 64...
... Pressing surface, 70 ... Electrode holding member, 81 ... Bolt, 84 ... Supporting member.

Below Up

Claims (1)

[Claims] 1. It is loosely fitted into the mounting hole provided in the object to be protected against corrosion.
a cylindrical first holding member with each end located inside and outside of the corrosion-protected object; and a first holding member installed between the first holding member and the mounting hole to maintain a fluid-tight space between the two. a sealing member for sealing; a cylindrical second holding member fitted to the first holding member so that an end portion of the first holding member located outside the corrosion-protected object is accommodated therein; a cylindrical pressing member that is fitted in the second holding member so as to face the first holding member to form a space between the pressing member and the opposing surface of the first holding member; a rod-shaped electrode that is inserted through the first holding member; and the electrode is positioned in a space between the pressing member and the first holding member so as to be in contact with both of them so as to be inserted thereinto, and the electrode is inserted into the inside of the pressing member and the first holding member. A corrosion-protected electrode comprising: an electrode holding member that holds an electrode; and a band-shaped support member linked to the sealing member to fixedly support the sealing member while being electrically connected to a corrosion-protected object. Mounting structure.