JPH03219093A - Fitting structure for corrosion protecting electrode - Google Patents

Abstract

PURPOSE:To simply and easily fit the corrosion protecting electrode by compressing a seal member with a first holding member and a second holding member, sealing a fitting hole part, and further pushing and fixing the holding member for the corrosion protecting electrode with the first holding member and the pushing member. CONSTITUTION:In the fitting hole 11 of a pipe joint 10 in the corrosion protecting object, the first holding member 30 having a through-hole 35 is set and each end part is positioned to inner and outer parts of the pipe joint 10, respectively, and the seal member 40 is set between the fitting hole 11 and the joint 10. The above seal member 40 is compressed with the first holding member 30 and the second holding member 50 screwed as fitting outside the first holding member to liquid-lightly seal the fitting hole 11. Successively, the corrosion protecting electrode 20 is inserted into the above through-hole 35 and the second holding member 50. Further, an elastic electrode holding member 70 fitted to the corrosion protecting electrode 20 in the second holding member 50 is pressed between the pushing member 60 having a male screw part 62 screwed with the female part 51 in the second holding member 50 and the first holding member 30. By this method, the corrosion protecting electrode 20 is held with the first and second holding members 30, 50 through the electrode holding member 70 and liquid-tightly fitted to the pipe joint 10.

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, an electrode is inserted into an object to be protected from corrosion, such as a steel pipe, and an electric current is passed through the liquid inside to prevent electrochemical corrosion. One end of the electrode inserted into the corrosion-protected object is located outside the corrosion-protected object so that it is supplied with electricity from the outside. For this reason,
The electrode needs to be supported in a state where it is insulated from the object to be protected against corrosion and in a state where it is liquid-tightly sealed. For example, Tokuko Sho 57-5
Publication No. 3869 discloses a structure for attaching an electrode to an object to be protected against corrosion in an insulated and liquid-tight manner. The structure of the electrode mounting is as shown in Figure 11.
It includes a cylindrical holding member 91 that is attached to an object to be protected against corrosion by screw connection.

The inner peripheral surface of the holding member 91 has a tapered surface 92 whose diameter gradually decreases toward the inner side, and a rubber packing 93 having an electrode insertion hole in the center is inserted into the inner peripheral surface of the tapered surface 92. . A mica glass insulating member 94 having an electrode insertion hole in the center thereof is screwed into the holding member 91 from the outside of the object to be protected against corrosion and is fixed to the rubber packing 93 . By screwing the insulating member 94 into the holding member 91 with the electrode 20 inserted into the electrode insertion hole of the rubber packing 93,
The rubber gasket 93 is compressed and reduced in diameter, and the electrode 20 is fixed. Moreover, due to the compression of the rubber packing 93, the holding member 9
The outside and inside of 1 are sealed liquid-tightly. In addition, since the fixed position of the electrode 20 with respect to the corrosion-protected object by the rubber seal 93 can be adjusted arbitrarily, the length of the electrode protrusion from the holding member 91 fixed to the corrosion-protected object can be easily adjusted.
The electrode surface area can be secured according to the area to be protected against 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 means of a 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 screw the male threaded part of the holding member 91 into the inner peripheral surface of the hole. It is necessary to thread the female thread part. Therefore, when attaching the electrode, it is necessary to perform hole machining work, which is time-consuming. On the other hand, an electrode mounting structure in which a cylindrical holding member 91 is integrally protruded from the outer circumferential surface of an object to be protected against corrosion is disclosed in, for example, Japanese Utility Model Application Publication No. 56-87463.

However, the electrode attachment structure requires welding to attach the holding member 91. Therefore, in consideration of the size of the equipment used for welding, its transportation, etc., the work of electrode attachment becomes more complicated than the structure of screwing the holding member 91 to the object to be protected against corrosion.

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. Possible electrode mounting is to provide structure.

(Means for Solving the Problems) The structure of the electrode attachment of the present invention is such that the attachment provided on the object to be protected against corrosion is loosely fitted into a hole, and each end is positioned inside and outside the object to be protected against corrosion. a cylindrical first holding member; a sealing member installed between the first holding member and the mounting hole to provide a liquid-tight seal between the two; and a sealing member located outside the corrosion protection object. a second holding member fitted to the first holding member such that an end portion of the first holding member is housed therein; and a second holding member that is inserted through the first holding member and inserted into the second holding member. a rod-shaped electrode inserted into the second holding member, an electrode holding member fitted into the electrode portion, and an electrode holding member fitted into the second holding member in order to press the electrode holding member against the first holding member. and a pressing member, thereby achieving the above object.

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

As shown in FIG. 1, the electrode mounting structure of the present invention is employed 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 part thereof,
The attachment has a hole 11 through which the electrode 20 is inserted. The mounting hole 11 has a circular cross section, and its inner peripheral surface is not threaded.

A cylindrical first holding member 30 is inserted into the hole 11 to attach the pipe joint IO. 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 circumferential surface of the first holding member 30, except for the distal end portion located inside the pipe joint 10. The distal end portion of the male threaded portion 31 is a straight tube portion 32 having an outer circumferential surface with a constant outer diameter, and the distal end portion of the first holding member 30 that is continuous with the straight tube portion 32 has a , the pressing portion 33 has a tapered shape and has an outer diameter that gradually increases as it moves away from the straight pipe portion 32. The maximum outer diameter of the pressing portion 33 is slightly smaller than the inner diameter of the mounting hole 11, and therefore, the first holding member 30 has a tip portion having the tapered pressing portion 33 attached to the pipe fitting. 10 from the outside.

A through hole 35 slightly larger than the outer diameter of the electrode 20 is inserted through the axial center of the first holding member 30 . The end surface of the first holding member 30 on the proximal side located on the outside of the pipe joint 10 is a tapered holding surface 34 whose inner diameter gradually increases toward the proximal side.

A sealing member 40 is installed between the hole 11 and the first holding member 30 in which the first holding member 30 is fitted. As shown in FIG. 2, the sealing member 40 has a cylindrical shape that is fitted over the pressing part 33 and the straight pipe part 32 at the distal end of the first holding member 30, and also over a part of the distal end side of the male threaded part 31. It has a metal sleeve 41 and an elastic seal 46 that is fitted onto the metal sleeve 41.

A flange portion 41a is provided at one end of the metal sleeve 41, and the metal sleeve 41 is attached to the pipe fitting 1 such that the flange portion 41a is located outside the pipe fitting 10.
0 is fitted into hole U. The outer diameter of the flange portion 41a is sufficiently larger than the inner diameter of the mounting hole 11. The central portion of the metal sleeve 41 in the axial direction is bulged outward in a semicircular shape so that a U-shaped concave groove 41b is formed over the entire circumference of the inner circumferential surface. The groove 43
An 0 ring 45 is fitted inside, and the 0 ring 4
5 is fitted onto the straight pipe portion 32 of the first holding member 30 and is pressed against the straight pipe portion 32 in a liquid-tight manner. At the end of the metal sleeve 41 opposite to the end where the flange portion 41a is provided, there is a tapered portion 41c whose inner diameter and outer diameter gradually increase toward the distal end. The tapered portion 41c faces the pressing portion 33 of the first holding member 30, and the angle of inclination of the tapered portion 41c with respect to the axis coincides with the axis of the outer peripheral surface of the pressing portion 32 of the first holding member 30. The tapered portion 41c is smaller than the inclination angle with respect to the center.
The inner circumferential surface is in close contact with the outer circumferential surface of the pressing part 33. Metals IJ
- The inner diameter of the portion of the tube 41 excluding the groove 41b and the tapered portion 41c is slightly larger than the outer diameter of the male threaded portion 31 and the straight pipe portion 32 of the first holding member 30.

A cylindrical elastic seal 46 is fitted over the entire metal sleeve 41 . The elastic seal 46 is made of an elastic body such as rubber having a predetermined thickness, and a metal sleeve 41 is attached to one end of the elastic seal 46.
A flange portion 46a that comes into contact with the flange portion 42 is provided. The flange portion 46 of the elastic seal 46
The outer diameter of the portion excluding a is the same as or slightly smaller than the inner diameter of the mounting hole 11. Also, its length is
The mounting length is slightly longer than the length of the hole 11 in the axial direction. The elastic seal 46 is fitted between the metal sleeve 41 that is fitted into the mounting hole 11 and the mounting hole 11, and is pressed against the entire outer peripheral surface of the metal sleeve 41 in a liquid-tight manner. At the same time, it is attached to the inner circumferential surface of the hole 11 in a liquid-tight manner.

The fitting 10 is attached to the tube member 4 attached to the hole 11.
0, the first holding member 30 has a suppressing portion 3 at its tip.
3. A portion of the straight pipe portion 32 and the male threaded portion 31 are fitted, and most of the male threaded portion 31 protrudes from the seal member 40. A cylindrical second holding member 50 is screwed into the protruding portion of the male threaded portion 31 . The second holding member 50 is made of a hard material such as metal, and has a female threaded portion 51 screwed into the male threaded portion 31 of the first holding member 30 on its inner peripheral surface.

The second holding member 50 is screwed onto the first holding member 30 and comes into contact with the flange portion 41 a of the metal sleeve 41 of the sealing member 40 . In the second holding member 50,
The side opposite to the sealing member 40 side is S/'? The fasteners are square in shape so that tools can engage them. The female threaded portion 51 provided on the inner peripheral surface of the second holding member 50 is
It is provided over the entire length of the second holding member 50, and its length is sufficiently longer than the length of the male threaded portion 31 of the first holding member 30. Therefore, when the female threaded portion 51 of the second holding member 50 is screwed into the male threaded portion 31 of the first holding member 30, the male threaded portion 31 of the first holding member 30 is located within the second holding member 50, and A space is formed on the holding surface 33 side of the first holding member 30.

A cylindrical pressing member 60 is screwed onto the other end of the female threaded portion 51 of the second holding member 50 screwed onto the first holding member 30 . Like the first holding member 30, the pressing member 60 is made of metal, plastic, etc. It is made of a hard material such as ceramic.

A flange-like slot 61 is provided at one end of the pressing member 60, and its outer peripheral surface is square so that a tightening tool such as a wrench can be engaged therewith. The outer circumferential surface of the pressing member 6o excluding the nut portion 61 is
A male threaded portion 62 is provided on the inner peripheral surface of the second holding member 50 and is screwed into the female threaded portion 51 . The pressing member 6
The through hole 63 inserted through the inside of the electrode 2 has an inner diameter that is equal to that of the electrode 2.
The outer diameter is slightly larger than the outer diameter of 0, and the end surface opposite to the side where the nut portion 61 is disposed is symmetrical to the holding surface 34 which is the proximal end surface of the first holding member 30, and the end surface is on the first holding member side. The pressure surface 64 has a tapered shape and gradually increases in diameter as the pressure increases. Then, so that a space is formed between the tapered holding surface 34 of the first holding member 30 and the pressing surface 64,
The pressing member 60 is screwed into the second holding member 50.

A cylindrical 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 is made of an elastic insulating material such as a fluororesin such as Teflon, or a rubber material such as 5BRS EPDM. An insertion hole 71 into which the rod-shaped electrode 20 is inserted is provided in the axial center of the electrode holding member 70 . The inner diameter of the insertion hole 71 is the same as or slightly smaller than the outer diameter of the electrode 20. The electrode 20 is made of a corrosion-resistant material such as titanium plated with platinum, and its outer diameter is usually 0. It is about 5 to 3.0 degrees.

The electrode 20 is covered with an insulating tube made of fluororesin or the like. At least one end of the insulating tube extends inward from the first holding member 30, and the other end reaches above the pressing member 60. 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 can maintain an insulated state without providing the insulation tube coating. .

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. Each side portion of the straight portion 72 in the axial direction is formed into a tapered portion 73 and 74, the outer diameter of which gradually decreases as the distance from the straight portion 72 increases. 1st
The tapered portion 73 located on the side of the holding member 30 has a first
Tapered holding surface 3 provided on the inner peripheral surface of the holding member 30
4, and the inclination angle of the outer circumferential surface of the tapered portion 73 with respect to the fineness is the same as the holding surface 34 of the first holding member 30.
The angle of inclination with respect to the axis of

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 greater than the inclination angle of the pressing surface 64 with respect to the axis. is also slightly larger.

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 is opened at a location where the electrode 20 of the pipe joint 10 is to be mounted.

Next, in a state where the circle ring 45 is fitted into the groove 43 in the metal sleeve 41 of the seal member 40, the first holding member 30 is inserted into the seal member 40, and the tapered portion 41c of the metal sleeve 41 is inserted. The pressing part 3 of the first holding member 30
3 facing each other. In this state, the first holding member 30
The base end portion of the electrode 20 is inserted into the inside of the electrode 20 from the distal end side.

Further, the electrode 20 exposed on the base end side of the first holding member 30
The end portion is inserted into the insertion hole 71 of the electrode holding member 70, and one tapered surface 73 of the electrode holding member 70 is inserted into the first holding member 3.
0 to face the pressing surface 34.

At this time, the electrode 2 protruding from the tip side of the first holding member 30
The length of 0 is adjusted. The O-ring 45 is fitted onto the straight pipe portion 32 of the first holding member 30 . And the seal member 4
0 is inserted into the hole 11, and the flange portion 46 of the elastic packing 46 of the seal member 40 is brought into pressure contact with the outer peripheral surface of the pipe joint 10. As a result, the fitting 10 can be installed in hole 1.
1, the first holding member 30 via the sealing member 40,
It is attached while holding the electrode 20.

In this state, the female threaded portion 51 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 comes into contact with the flange portion 42 of the metal sleeve 41 of the 7-ring member 40. Even after that, if the second holding member 50 is screwed into the first holding member 30 while the first holding member 30 is not rotating, the first holding member 30 will be relatively inserted into the second holding member 50 as it is screwed in. Moving. As a result, the pressing portion 34 of the first holding member 30 enters into the tapered portion 41c of the metal sleeve 41 in the sealing member 40, and the diameter of the tapered portion 44 is expanded.

As a result, the elastic seal 46 is compressed due to the opening between the outer circumferential surface of the tapered portion 44 and the inner circumferential surface of the hole 11, and the distal end surface of the second holding member 50 is connected to the metal sleeve 41 in the sealing member 40. The elastic seal flange 46a of the seal member 40 is pressed against the outer peripheral surface of the pipe joint 10. 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, due to the compression of the elastic seal 46 in the seal member 40, the mounting is done in a liquid-tight manner between the inner circumferential surface of the hole 11 and the outer circumferential surface of the elastic seal 46, and between the inner circumferential surface of the elastic sole 46 and the outer circumferential surface of the metal sleeve 41. will be sealed. Furthermore, an O-ring 45 provides a fluid-tight seal between the inner circumferential surface of the metal sleeve 41 and the outer circumferential surface of the first holding member 3o. Therefore, when installing the pipe fitting 10, the hole 11 is the through hole 35 of the first holding member 30.
Sealed liquid-tight, except for

When the second holding member 50 is screwed into the first holding member 3o, the female threaded portion 51 of the second holding member 50 on the opposite side to the first holding member 3 screwed part is attached to one end of the pressing member 60. The provided male threaded portion 62 is screwed together. When the pressing member 60 is screwed into the second holding member so, 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 contacts the tapered surface 74, if a tool such as a wrench is used to tighten the nut portion 61 of the pressing member 60 and the pressing member 60 is forcibly screwed into the second holding member 50, the electrode can be tightened. Holding member 70
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 the tapered portions 73 and 74, respectively.

At this time, the electrode holding member 70 has a tapered holding surface 34 provided on the inner peripheral surface of the first holding member 3° and a pressing member 60.
is compressed in the direction of the central axis by a tapered pressing surface 64 provided on the inner circumferential surface of. This compression causes the electrode holding member 7 to
0 applies a tightening force to the electrode 20 inserted through the insertion hole 71. The angles of the holding surface 34 of the first holding member 30 and the pressing surface 64 of the second holding member 60 with respect to the central axis are 15 to 75 degrees so that the same deforming force is likely to be generated on the center side of the electrode holding member 70. Range is preferred. In particular, it is preferable to set the angle to 40 to 50 degrees so that the deforming force acts concentratedly on one point on the central axis. 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
It is firmly fixed within the electrode holding member 70. This results in
The tip of the electrode 20 is held inside the pipe fitting 10, and the space between the holding surface 33 and the tapered surface 73 of the electrode holding member 70 and between the insertion hole 71 of the electrode holding member 70 and the electrode 20 is liquid-tight. will be sealed. Therefore, the internal space of the first holding member 30 is also sealed liquid-tightly.

Furthermore, the second metal holding member 5o and the electrode 2o are electrically insulated by the electrode holding member 70.

Further, even if the electrode 20 is deformed, the short circuit between the electrode 20 and the second holding member 50 can be prevented by using the insulating material to
0 and the pressing member 60. Furthermore, when the first holding member 30 and the pressing member 60 are made of a conductive material such as metal, the electrode 20 can be coated with an insulating tube.
0 and the pressing member 60 can be prevented from shorting. Similarly, a short circuit between the electrode 20 and the pipe fitting 10 is prevented by the elastic packing 46 in the first holding member 30 and the compression member 40.

In addition, the proximal end of the electrode 20 is inserted into the insertion hole 7 of the electrode holding member 70.
By adjusting the insertion amount when inserting into electrode 1,
0 into the pipe joint 10 is changed, and the insertion position of the tip of the electrode 20 within the pipe joint 10 can be arbitrarily adjusted. Even when the pressing member 50 is screwed in, the electrode 2
This adjustment is possible before 0 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.

For example, between the pressing surface 64 of the pressing member 60 and the tapered surface 74 of the electrode holding member 70 facing the pressing surface 64,
A collar 80 as shown in FIG. 4 may also be inserted. The collar 80 has a truncated conical tube shape, and its maximum outer diameter is approximately equal to the outer diameter of the pressing surface 64 of the pressing member 60. The angle of inclination of the collar 80 with respect to the axis is approximately equal to the angle of inclination of the tapered surface 74 of the electrode holding member 70 with respect to the axis. The electrode 20 is inserted into the axial center of the collar 80 in a non-contact manner. Pressing surface 64 of pressing member 60 and electrode holding member 7
In the state where the collar 80 is interposed between the tapered surface 74 of the electrode holding member 70 and the electrode holding member 70, even if the pressing member 60 is directly screwed into the second holding member 50, the collar 80 is pressed against the tapered surface 74 of the electrode holding member 70. Therefore, there is no possibility that the tapered surface 74 will come into sliding contact with the pressing surface 64 of the pressing member 60. Therefore,
Wear and damage to the electrode holding member 70 are suppressed. color 8
Protection of the electrode insulating member 70 by the electrode holding member 7
This is particularly effective when the zero is made of an elastic material.

Further, as shown in FIG. 5, the electrode holding member 70 may have a cylindrical holding part 75 protruding from one end so as to come into pressure contact with the electrode 20. The electrode holding member 70 is integrally formed of an elastic insulating material. The holding portion 75 has an outer diameter slightly smaller than the inner diameter of the insertion hole 63 of the pressing member 60 so as to be inserted into the pressing member 60 .

When the electrode holding member 70 is used, even if the electrode 20 is deformed, the holding portion 70 holds the electrode 20 and the pressing member 6.
Contact with 0 is prevented. Therefore, the pressing member 60 can be made of metal. By doing so, even if the pressing member 60 is properly screwed into the second holding member 50, there is no risk of damage to the pressing member 60, and sufficient screwing torque can be ensured. Therefore, retention and sealing of the electrode 20 becomes more reliable.

Further, when the first holding member 30 is made of plastic, as shown in FIG.
A metal cover 100 may be attached to the cover. With such a configuration, when the tapered portion 41c of the metal sleeve 41 in the seal member 40 is expanded in diameter by screwing in the second holding member 50 and pulling up the first holding member 30, the first holding member 50 is screwed in and the first holding member 30 is pulled up. Damage to the holding member 30 is suppressed, and the insulation between the electrode 20 and the second holding member 50 is also improved.
Go up a layer.

A further embodiment of the pond according to the invention is shown in FIG.

In this embodiment, the elastic seal 45 in the seal member 40
is fitted onto the upper end surface of the flange portion 41a of the metal sleeve 41, and the washer 48 is attached to the elastic seal 45.
The second holding member 50 is screwed into the first holding member 30 in a state where they are in contact with each other. The tip of the second holding member 50 is abutted against the washer 48. The metal sleeve 41 has a right cylindrical shape except for the flange portion 41a, and the right cylindrical portion has an axial direction from its distal end side so that the diameter of the right cylindrical portion can be easily expanded. A large number of grooves 41s extending from the front are provided at appropriate intervals around the circumference. As a result, the sealing performance of the elastic seal 46 is improved as described above, and the processing of the groove portion of the seal member 40 into which the elastic seal 45 of the metal sleeve 41 is fitted becomes easy, and furthermore, damage to the elastic seal 45 is prevented. Ru.

In this embodiment, the female threaded portion 51 of the second holding member 50 that is screwed to the male threaded portion 31 of the first holding member 30 is provided only below the portion where the electrode holding portion 70 is located. A protrusion 52 that protrudes inward is provided on the inner circumferential surface of the second holding member 50 that faces the portion 70 . The inner circumferential surface of the protrusion 52 is smooth, so that when the electrode holding portion 70 expands outward due to the pressure between the first holding member 30 and the pressing member 60, the expanded portion is smooth. It is pressed by the inner peripheral surface of the protrusion 52 . Thereby, the compressive force applied to the electrode holding member 70 is reliably transmitted to the electrode 20, the holding of the electrode 20 by the electrode holding member 70 is ensured, and the sealing performance between the two is further improved.

Further, the pressing member 60 has a larger diameter than the first holding member 30, and therefore, the second holding member 50 has a female screw thread that is screwed to a male threaded portion 62 formed on the outer peripheral surface of the pressing member 60. The portion 51b is the male threaded portion 3 of the first holding member 30.
The female threaded portion 51a that is threadedly connected to the threaded portion 1 is formed to have a different diameter.

When the electrode holding part 70 expands outward, the flat part that presses the expansion is the protrusion 5 provided on the second holding member 5o.
2, for example, as shown in FIG. Alternatively, the expanding electrode holding member 70 may be pressed. Also,
As shown in FIG. 9, the recess 37 of the first holding member 30 is
It is made to protrude more toward the pressing member 60 than the male threaded portion 31,
The pressing member 60 may be provided with an annular recess 67 into which the protruding portion can fit. In this way, the electrode holding member 70 does not bulge outward from the gap between the pressing member 60 and the first holding member 30 due to the pressure exerted by the pressing member 60 and the first holding member 30.
The electrode 20 can be held securely by the electrode holding member 70, and the sealing performance between the two can also be improved.

Furthermore, as shown in FIG. 10, if a collar 80 made of metal or the like is attached to the tapered part 74 of the IT+ holding member 70 on the side of the pressing member 60, the pressing member that is applied to the 74-pole holding member 70 60 can be reliably used as a compressive force for the electrode 20, and damage to the electrode holding member 70 can also be prevented.

(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.

Moreover, the first holding member not only holds the electrode holding member but also functions as a processing jig for deforming the compression member. Moreover, the second holding member also functions as a member for not only holding the electrode holding member but also tightening when fixing the first holding member 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.

Furthermore, since the electrode is configured to be able to be held securely by pressing the electrode holding member, the sealing performance between the electrode member and the electrode is the same as above.

4. Don't worry! 6. Figure 1 is a sectional view showing one embodiment of the electrode mounting structure of the present invention, and Figure 2 is a sectional view of the compression member used therein.
Figure 3 is a sectional view of the same electrode holding member, Figure 4 is a sectional view of a collar used in another electrode mounting structure of the present invention, and Figure 5 is a sectional view showing another example of the electrode holding member. 6 and 7 are sectional views showing still other embodiments of the electrode mounting structure of the present invention, and FIGS. 8 and 9 are sectional views showing still other embodiments of the electrode mounting structure of the present invention, respectively. FIG. 10 is a cross-sectional view of a main part in an embodiment of the present invention, and FIG. 11 is a cross-sectional view of a conventional electrode mounting structure.

10... Pipe joint (corrosion protection target), 20... Electrode, 3
0... First holding member, 33... Pressing surface, 34...
Holding surface, 40... Compression member, 50... Second holding member, 60... Pressing member, 64... Pressing surface, 70...
Electrode holding member.

that's all

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 whose ends are located inside and outside the corrosion-protected object; and a first holding member installed between the first holding member and the mounting hole to provide a fluid-tight seal between the two. a second holding member fitted to the first holding member such that an end portion of the first holding member located outside the corrosion-protected object is accommodated therein; and a second holding member fitted to the first holding member; a rod-shaped electrode that is inserted through the member and inserted into the second holding member; an electrode holding member fitted to the electrode portion that is inserted through the second holding member; and a first holding member that holds the electrode holding member. the second
A corrosion-proof electrode mounting structure comprising: a pressing member fitted into a holding member;