JP3148038U - Water pipe electric protection system - Google Patents

Abstract

To prevent corrosion of a pipe in a pipe network over a wide range as seen from an external power source in a pipe network in which a pipe is made of epoxy lining on the pipe inner surface or made of an inner lining pipe. A constant current source, a water pipe that is electrically connected to a cathode terminal of the constant current source, an anode terminal of the constant current source, and a water pipe that is electrically connected to the anode terminal of the constant current source. In the pipe axis direction, there is a line electrode 4 arranged so as to be electrically insulated from the water pipe 3 and the branch pipe 5, and a line electrode arranged so as to be electrically insulated in the pipe axis direction in the pipe. And a water pipe 6 connected through a branch pipe 5 from the water pipe 3. [Selection] Figure 4

Description

  The present invention relates to an anticorrosion system for an inner surface of a water pipe of an external power supply system.

  Conventionally, since a galvanized steel pipe has been used for a water pipe, the inside of the pipe has been corroded and it has been necessary to provide corrosion protection. However, in recent years, hard vinyl chloride lining pipes (hereinafter referred to as inner lining pipes) have been used for water pipes instead of galvanized steel pipes. Since the inner lining pipe has a hard vinyl chloride film lined on the steel pipe, the steel material is not exposed to the pipe inner face. However, the steel material is exposed at the end face portion without the lining. In addition, since the water pipe is usually used by being connected by a joint, the steel surface is exposed at the joint between the pipe and the joint and the joint between the pipe and the curved pipe. Therefore, even when an inner lining pipe is used, it is necessary to provide corrosion protection to the pipe.

Patent Document 1 discloses an anticorrosion technique in a water supply pipe according to the prior art. According to this anticorrosion technology, a linear electrode is disposed in a pipe for supplying water containing calcium ions and magnesium ions, and the line electrode is used as an anode and the pipe is used as a cathode to intermittently energize the pipe. In order to prevent corrosion, a film of a basic compound containing calcium and magnesium is formed on the inner surface.
JP 2000-273665 A

However, according to the conventional anticorrosion technology, since a constant voltage source is used as an external power source, as a basic compound film containing calcium and magnesium is formed on the inner surface of the pipe, the external power source As a result, the resistance of the piping network was increased, so that the energization current was reduced and the piping network could not be protected over a high range.
The object of the present invention has been made in view of the above-mentioned problems. Even in a pipe network in which epoxy lining is applied to the pipe inner surface of the water pipe, the water pipe is made of an inner lining pipe. It is an object of the present invention to provide a water pipe electrocorrosion protection system that enables corrosion protection in a wide range of piping networks as viewed from an external power source.

The present invention employs the following means in order to solve the above problems.
The first means includes a constant current source, a water pipe electrically connected to the cathode terminal of the constant current source, and a pipe in the water pipe electrically connected to the anode terminal of the constant current source. From the water pipe, which does not have a line electrode arranged in the axial direction so as to be electrically insulated from the water pipe, and a line electrode arranged so as to be electrically insulated in the pipe axis direction in the pipe. An electric corrosion prevention system for water pipes, characterized by comprising a branched water pipe.
The second means includes a constant current source, a water pipe electrically connected to the cathode terminal of the constant current source, and a pipe in the water pipe electrically connected to the anode terminal of the constant current source. In the axial direction, there is no line electrode disposed so as to be electrically insulated from the water pipe and a branch pipe described later, and no line electrode disposed so as to be electrically insulated in the axial direction of the pipe in the pipe. And a water pipe branched from the branch pipe.
A third means is the second means, wherein the other end of the branched water pipe is connected to another water pipe via a curved pipe, and the curved pipe and the other water pipe are pipes in the pipe. An electric corrosion prevention system for a water pipe, characterized in that it does not have a wire electrode arranged so as to be electrically insulated in the axial direction.
A fourth means is the water pipe electro-corrosion protection system according to the first means, wherein the water pipe has an epoxy lining on the inner surface of the pipe.
A fifth means is the water pipe electro-corrosion protection system according to the second means, wherein the water pipe and the branch pipe are provided with epoxy lining on the pipe inner surface.
A sixth means is that, in the third means, the water pipe, the branch pipe, the branched water pipe, the bent pipe, and the other water pipe have an epoxy lining on the inner surface of the pipe. This is an electric corrosion protection system for water pipes.
A seventh means is the water pipe electro-corrosion protection system according to the first means, wherein the water pipe has a resin film lined on the pipe inner surface.
The eighth means is the water-proof anticorrosion system according to the second means, wherein the water pipe and the branch pipe are lined with a resin film on the inner surface.
A ninth means is that, in the third means, the water pipe, the branch pipe, the branched water pipe, the curved pipe, and the other water pipe have a resin film lined on the pipe inner surface. This is an electric corrosion protection system for water pipes.

According to the invention described in claim 1 to claim 3, by utilizing the constant current characteristics of the constant current source, not only the water pipe in which the line electrode is laid but also the water pipe in which the line electrode is not laid. It is possible to realize electric corrosion protection of water pipes in a wide range of piping networks including.
In addition, according to the inventions according to claims 4 to 6, not only water pipes in which epoxy lining is applied to the inner surface of the pipe and line electrodes are laid but also water pipes in which line electrodes are not laid are included. It is possible to realize water pipe anticorrosion in a wide range of piping networks.
Further, according to the inventions according to claims 7 to 9, not only water pipes in which a resin film is lined on the inner surface of the pipe and line electrodes are laid but also water pipes in which line electrodes are not laid are provided. It is possible to realize electric corrosion protection of water pipes in a wide range of piping networks including.

A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a cross-sectional view showing a part of the configuration of the water pipe electro-corrosion protection system according to the device of the present embodiment.
In the figure, 1 is a constant current source as an external power source used in this system, 2 is an insulating wire electrode penetrating tool, 3 is a water pipe with an epoxy lining on the inner surface of the pipe, and 4 is in the water pipe 3 The wire electrode 5 is disposed in the direction of the pipe axis and is provided with an insulating protective coating for preventing electrical contact with the inner surface of the pipe. An epoxy lining is applied to the inner surface of the pipe 5 for branching the water pipe 3. The branch pipe 6 is connected to the branch pipe 5 and is a water pipe whose inner surface is epoxy-lined, 7 is a curved pipe which is connected to the water pipe 6 and whose inner surface is epoxy-lined, and 8 is a curved pipe 7. It is a water pipe whose flow direction is bent by the above and epoxy lining is applied to the inner surface of the pipe.

FIG. 2 is a diagram showing an example of a circuit configuration in the constant current source 1 shown in FIG.
In the figure, 12 is a reference voltage unit for generating a reference voltage at the output terminal, 13 is a current detection unit for detecting a current flowing from the constant current source 1 to the piping network, and 14 is a voltage and current output from the reference voltage unit 12. An error amplifier that detects a voltage difference from the voltage detected by the detection unit 13 and sends a control signal to the control unit 15 based on the detected voltage difference, and 15 is a control unit that controls the supply voltage based on the control signal from the error amplifier 14 It is.
In the same figure, when a predetermined current flows, the current detection unit 13 has the same voltage drop based on the current detected by the current detection unit 13 and the voltage output from the reference voltage unit 12. The voltage detected by the error amplifier 14 is zero, and the control unit 15 continues to pass a predetermined constant current without particular control. On the other hand, when the current flowing from the constant current source 1 tends to decrease, the voltage detected by the current detection unit 13 decreases accordingly. As a result, a difference voltage is generated between the voltage output from the reference voltage unit 12 and the voltage detected by the current detection unit 13. When the error amplifier 14 detects this differential voltage, it operates to control the control unit 15 to increase the voltage output from the control unit 15. As a result, the current flowing through the current detector 13 is controlled to increase until reaching the original predetermined constant current, and the current flowing from the constant current source 1 to the piping network can be kept constant. Actually, in order to flow a constant current from the constant current source 1, the voltage output from the control unit 15 is controlled so as not to increase infinitely.

As shown in FIG. 1, the positive electrode side of the constant current power source 1 passes through the line electrode penetrating tool 2 and is electrically connected to the line electrode, and the negative electrode side of the constant current power source 1 is electrically connected to the water pipe 3. The water pipe 3, the branch pipe 5, the water pipe 6, the curved pipe 7, and the water pipe 8 are connected in close contact with each other and are therefore maintained at the same potential.
In the figure, the current flowing out from the positive electrode side of the constant current power source 1 is supplied to the constant current power source 1 via the line electrode 4 laid in the water pipe 3, tap water in the water pipe 3, and the water pipe 3. Flows to the negative electrode side.
At that time, a basic compound containing ionized calcium and magnesium in tap water is formed by coating the inner surface of the water pipe 3 and the branch pipe 5, and the water pipe 3 and the branch having an epoxy lining on the pipe inner surface. Corrosion of the pipe 5 can be prevented.

FIG. 3 is a cross-sectional view showing a part of the configuration of the water pipe anticorrosion system in a state where the electric corrosion prevention has progressed to some extent after the start of energization in the water pipe electrocorrosion protection system of the present invention shown in FIG. 1.
In the figure, reference numeral 9 denotes an electrically insulating film made of a basic compound containing calcium and magnesium, which is formed on the inner surfaces of the water pipes 3 and 6, the branch pipe 5 and the curved pipe 7. Other configurations correspond to the configurations of the same reference numerals shown in FIG.
As shown in the figure, the cathodic protection proceeds from the inner surfaces of the water pipe 3 and the branch pipe 5, and as the coating 9 is formed on the inner surfaces of the water pipe 3 and the branch pipe 5, the wire electrode 4 and the water pipe 3 and The electrical resistance between the branch pipe 5 increases. When the electrical resistance between the line electrode 4 and the water pipe 3 and the branch pipe 5 increases, the current flowing through the line electrode 4 causes the water pipe 6 connected to the line electrode 4 and the branch pipe 5 exhibiting a lower resistance. The film 9 flows up to the water pipe 6 and the water pipe 6 is also electrically protected. However, in the conventional anti-corrosion technology, a constant voltage source is used for the external power supply, and therefore the piping network viewed from the constant voltage source is formed by the coating 9 formed on the water pipes 3 and 6 and the branch pipe 5. As a result, the current flowing through the line electrode 4 gradually decreased, and for example, the pipe network disposed far from the constant voltage source could not be adequately protected.

FIG. 4 shows an example of the structure of the water pipe electro-corrosion protection system in the water pipe electro-corrosion protection system of the present invention shown in FIG. 1 in a state where the electro-corrosion proceeds from the state shown in FIG. It is sectional drawing which shows a part.
As shown in the figure, according to the present invention, the anticorrosion gradually proceeds to the pipe network, and the water pipes 3 and 6 and the branch pipe 5 are formed with the film 9 exhibiting high electrical resistance. The electrical resistance of the piping network seen increases, and the energization current passing through the constant current source 1 tends to decrease gradually. However, since the external power source is composed of the constant current source 1, current detection in the constant current source 1 is performed. When a decrease in current is detected in the unit 12, the control unit 14 operates to supply a high voltage and works to increase the current flowing from the constant current source 1, so that the current becomes constant. Retained. Therefore, for example, the current flows to the range of the pipes arranged far from the constant current source 1, for example, the curved pipe 7 and the water pipe 8, up to the range of the curved pipe 7 and the water pipe 8, It will be possible to apply anti-corrosion. In other words, according to the water pipe electro-corrosion protection system according to the present embodiment, compared to the water pipe electro-corrosion protection system according to the prior art, the constant current source 1 in the pipe network in which the pipe inner surface is subjected to epoxy lining. Electrocorrosion protection is possible even for a wide range of piping networks that are far from each other.

Next, a second embodiment according to the present invention will be described with reference to FIGS.
FIG. 5 is a cross-sectional view showing a part of the configuration of the water pipe electrocorrosion protection system according to the device of the present embodiment.
In the figure, 3 'is a water pipe having a resin coating 10 lined on the inner surface of the pipe, 5' is a branch pipe having a resin film 10 lined on the inner surface of the pipe for branching the water pipe 3 ', 6' A water pipe connected to the branch pipe 5 'and lined with the resin coating 10 on the inner surface of the pipe, 7' is a curved pipe connected to the water pipe 6 'and lined with the resin coating 10 on the inner surface of the pipe, and 8' is a bent pipe. It is a water pipe with a resin coating 10 lined on the inner surface of the pipe whose flow direction is bent by 7 '. Other configurations correspond to the configurations of the same reference numerals shown in FIG.

As shown in FIG. 5, the positive electrode side of the constant current power source 1 passes through the line electrode penetrating tool 2 and is connected to the line electrode 4, and the negative electrode side of the constant current power source 1 is electrically connected to the water pipe 3 ′. Since the water pipe 3 ', the branch pipe 5', the water pipe 6 ', the curved pipe 7', and the water pipe 8 'are in close contact with each other, they are maintained at the same potential.
In the figure, the current flowing out from the positive electrode side of the constant current power source 1 is a constant current via the wire electrode 4 laid in the water pipe 3 ', the tap water in the water pipe 3', and the water pipe 3 '. It flows to the negative side of the power source 1. At that time, a basic compound containing ionized calcium and magnesium in tap water is formed by being coated on the end surface of the water pipe 3 and the steel material without the lining of the resin coating 10 of the branch pipe 5, The water pipe 3 and the branch pipe 5 having epoxy lining on the pipe inner surface can be anticorrosive.

FIG. 6 is a cross-sectional view showing a part of the configuration of the water pipe electro-corrosion protection system in a state where the electro-corrosion has progressed to some extent after the start of energization in the water pipe electro-corrosion protection system of the present invention shown in FIG.
In the figure, 11 is a base containing calcium or magnesium formed on the end surface of the water pipe 3 ', 6', branch pipe 5 ', and curved pipe 7' where the resin coating 10 with no lining is exposed. It is an electrically insulating film made of a conductive compound. Other configurations correspond to the configurations of the same reference numerals shown in FIG.
As shown in the figure, the cathodic protection proceeds from the end surface of the water pipe 3 ′ and the branch pipe 5 ′ where the steel coating without the resin coating 10 is exposed, and the resin of the water pipe 3 ′ and the branch pipe 5 ′. As the coating film 11 is formed on the end surface where the steel material without the lining of the coating film 10 is exposed, the electrical resistance between the wire electrode 4 and the water pipe 3 'and the branch pipe 5' increases. When the electrical resistance between the line electrode 4 and the water pipe 3 ′ and the branch pipe 5 ′ increases, the current flowing through the line electrode 4 is connected to the line electrode 4 and the branch pipe 5 ′ exhibiting a lower resistance. The coating 11 is formed on the end surface of the water pipe 6 ′ where the steel material without the lining of the resin coating 10 of the water pipe 6 ′ is exposed, and even the water pipe 6 ′ is electrically protected. However, in the conventional anti-corrosion technology, a constant voltage source is used for the external power source, so that the end surfaces of the water pipes 3 ', 6' and the branch pipe 5 'without the coating lining are exposed. The coating 11 formed also increases the electrical resistance of the piping network as viewed from the constant voltage source, and the current flowing through the line electrode 4 gradually decreases. For example, the piping network located far from the constant voltage source It was not possible to perform sufficient anticorrosion.

FIG. 7 shows an example of the configuration of the water pipe electrocorrosion protection system of the present invention shown in FIG. 5 in a state where the electrocorrosion progresses to the piping network in a wider range from the state shown in FIG. It is sectional drawing which shows a part.
As shown in the figure, according to the present invention, the anticorrosion gradually proceeds to the pipe network, and the end portions of the water pipes 3 'and 6' and the branch pipe 5 'where the steel material without the lining of the resin coating 10 is exposed. A coating 11 exhibiting high electrical resistance is formed on the surface, and the electrical resistance of the piping network viewed from the constant current source 1 is increased, and the current flowing through the line electrode 4 is gradually reduced. 1, when the current detection unit 13 in the constant current source 1 detects a decrease in current, the control unit 15 controls to supply a high voltage so as to increase the current flowing from the constant current source 1. As a result, the current is held constant. Therefore, for example, the current flows up to a range of the end face where a pipe disposed at a position far from the constant current source 1, for example, the steel material without the lining of the resin coating 10 of the curved pipe 7 ′ or the water pipe 8 ′ is exposed. As a result, it becomes possible to apply anticorrosion to the range of the curved pipe 7 'and the water pipe 8'. In other words, according to the water pipe electro-corrosion protection system according to the present embodiment, compared with the water pipe electro-corrosion protection system according to the prior art, in the pipe network in which the resin film 10 is lined in the pipe, Electrocorrosion protection is possible even for a wide range of piping networks far from the current source 1.

  In addition, in the water pipe electro-corrosion protection system according to the devices of the first and second embodiments, the water pipe is electrically insulated from the water pipe in the axial direction of the water pipe connected through the branch pipe. Although the example in which the line electrode is not laid has been described, the water pipe electro-corrosion protection system according to the present invention is not limited to such a configuration, and is constituted only by the water pipe. The present invention is also applicable to a configuration including a water pipe that is laid and a water pipe that is not laid with a line electrode.

It is sectional drawing which shows a part of structure of the cathodic protection system of the water pipe which concerns on the design of 1st Embodiment. It is a figure which shows an example of the circuit structure in the constant current source shown in FIG. FIG. 2 is a cross-sectional view showing a part of the configuration of the water pipe electro-corrosion protection system in a state where the electro-corrosion has progressed to some extent after the start of energization in the water pipe electro-corrosion protection system of the present invention shown in FIG. 1. 1 is a cross-sectional view showing a part of the configuration of the water pipe electro-corrosion protection system in a state where the electro-corrosion has progressed to the piping network in a wider range from the state shown in FIG. FIG. It is sectional drawing which shows a part of structure of the cathodic protection system of the water pipe which concerns on the design of 2nd Embodiment. FIG. 6 is a cross-sectional view showing a part of the configuration of the water pipe electro-corrosion protection system in a state where the electro-corrosion has progressed to some extent after the start of energization in the water pipe electro-corrosion protection system of the present invention shown in FIG. 5. 5 is a cross-sectional view showing a part of the configuration of the water pipe electro-corrosion protection system in a state where the electro-corrosion has progressed to the pipe network more widely than the state shown in FIG. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Constant current source 12 Reference voltage part 13 Current detection part 14 Error amplifier 15 Control part 2 Wire electrode penetration tool 3 Water pipe 4 Wire electrode 5 Branch pipe 6 Water pipe 7 Curved pipe 8 Water pipe 9 Film 10 Resin film 11 Film 3 ' Water pipe 5 'Branch pipe 6' Water pipe 7 'Curved pipe 8' Water pipe

Claims (9)

  A constant current source; a water pipe electrically connected to the cathode terminal of the constant current source; and a water pipe electrically connected to the anode terminal of the constant current source and in the direction of the tube axis in the water pipe. A line electrode arranged so as to be electrically insulated from the pipe, and a water pipe branched from the water pipe having no line electrode arranged so as to be electrically insulated in the direction of the tube axis in the pipe; A water pipe cathodic protection system.   A constant current source; a water pipe electrically connected to the cathode terminal of the constant current source; and a water pipe electrically connected to the anode terminal of the constant current source and in the direction of the tube axis in the water pipe. Branched from the branch pipe, which does not have a line electrode arranged so as to be electrically insulated from the pipe and a branch pipe described later, and a line electrode arranged so as to be electrically insulated in the pipe axis direction in the pipe A water pipe, and an anticorrosion system for the water pipe.   The other end of the branched water pipe is connected to another water pipe via a curved pipe, and the curved pipe and the other water pipe are disposed with electrical insulation in the direction of the pipe axis in the pipe. 3. The water pipe cathodic protection system according to claim 2, wherein the system does not have a line electrode.   2. The water pipe electro-corrosion protection system according to claim 1, wherein an epoxy lining is applied to an inner surface of the water pipe.   The said water pipe and the branch pipe have an epoxy lining on the inner surface of the pipe.   The water pipe according to claim 3, wherein the water pipe, the branch pipe, the branched water pipe, the bent pipe, and the other water pipe are provided with epoxy lining on the inner surface of the pipe. Electric corrosion protection system.   2. The water pipe cathodic protection system according to claim 1, wherein the water pipe has a resin coating lined on an inner surface of the pipe.   The water pipe electric corrosion protection system according to claim 2, wherein the water pipe and the branch pipe have a resin film lined on the inner surface of the pipe.   The water pipe according to claim 3, wherein the water pipe, the branch pipe, the branched water pipe, the bent pipe, and the other water pipe have a resin film lined on the inner surface of the pipe. Galvanic protection system.