JPH10292893A - Water leakage detector of water distribution pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate an erroneous decision due to dew condensation by receiving water leakage from a water distribution pipe by a water leakage tray and detecting water leakage of the water distribution pipe from a water leakage liquid level location of the water leakage tray. SOLUTION: A water leakage detector 20 is fixed to a heat insulating material 12 on the upper side of a water leakage tray 13. A liquid level detection sensor part 21 extended from this water leakage detector 20 is arranged so as to be located within a water leakage receiving part 19 of the water leakage tray 13. Liquid such as dew condensation or water leakage dropping along the water distribution pipe 11 flows in this water leakage receiving part 19. The water leakage detector 20 generates liquid level positional data within the water leakage receiving part 19 by using a liquid level signal detected by the liquid level detection sensor part 21. When liquid level positional data generated in the liquid level detector 20 is prescribed positional data or below, the liquid level location detected is decided to be one due to dew condensation. When the liquid level positional data is the prescribed positional data or more, the liquid level location detected is decided to be one due to water leakage and some notification signals are generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the detection of water leaks in water distribution pipes for supplying liquid to equipment constituting various plants in various plants.

[0002]

2. Description of the Related Art In various plants, various liquids such as, for example, cooling water and lubricating oil are supplied to equipment constituting the plants via water distribution pipes. This water distribution pipe is corroded by long-term use, and is damaged by vibration or impact.
It is expected that the liquid being distributed leaks from the corroded and damaged portions. If the supply of the liquid to be distributed is stopped or the supply amount is reduced due to the corrosion damage of the water distribution pipe, the operation of the plant is hindered. For this reason, water distribution pipes are constantly checked to check for corrosion damage.However, since water distribution pipes are installed over long distances, there are many inspections for corrosion damage and leakage. It took human resources and time.

[0003] For this purpose, a method has been used in which a water leakage detection means is attached to a water distribution pipe for monitoring. The specific contents of the water leakage detection device will be described with reference to FIG.

FIG. 4A is a cross-sectional view showing a state in which a water leakage detecting means is attached to a water distribution pipe. Water distribution pipe 31
A water leakage detection tape 32 is spirally wound around the outer periphery of the pipe. In this tape 32 for detecting water leakage, electrodes 32a and 32b are provided in parallel with each other.
The electrode surface b is wound so as to be in close contact with the outer periphery of the water distribution pipe 31. After attaching the water leakage detection tape 32 to the water distribution pipe 31, the whole of the water distribution pipe is covered with a heat insulating material 33 to prevent the liquid flowing in the water distribution pipe 31 from freezing. In this manner, between the two electrodes 32a, 32b at one end of the water leakage detection tape 32 spirally wound around the water distribution pipe 31, FIG.
As shown in (b), a power supply 34 and a water leak detector 35 are connected in series.

[0005] In the water leakage detecting device thus configured, when water leaks due to corrosion damage at a certain portion of the water distribution pipe 31, the water leaking from the water leakage location flows along the outer periphery of the water distribution pipe 31 and flows out. . The discharged liquid permeates also into the water leakage detection tape 32. The liquid that has penetrated into the water leakage detection tape 32 establishes a conductive state between the electrodes 32a and 32b, and the water leakage detector 35 detects the conductive state to notify the occurrence of water leakage.

When the water distribution pipe 31 is made of a metal material, a specific resistance value of the metal material is set in the water leak detector 35 in advance, and the resistance value of the metal material and the water resistance of the metal material are determined. A change in the resistance value with the resistance value of the liquid is detected, and the occurrence of water leakage is determined and notified.

However, if a temperature difference occurs between the temperature of the liquid flowing in the water distribution pipe 31 and the outside air temperature of the water distribution pipe 31, dew condensation due to the moisture of the outside air occurs on the outer circumference of the water distribution pipe 31. This condensation is caused by the water leakage detection tape 3
2, water droplets due to dew drop and penetrate into the water leakage detection tape 32. With this water droplet, the water leakage detector 35 detects the conduction or the change in resistance value between the electrodes 32a and 32b of the water leakage detection tape 32, and it is possible to make a water leakage notification even though water leakage has not occurred. It has happened often.

Further, when the water distribution pipe 31 and the water leakage detection tape 32 are inspected and maintained, since the water leakage detection tape 32 is covered with the heat insulating material 33, it is difficult to detect a defective portion and to replace the water leakage detection tape 32. Or, when repairing, many insulation materials 3
3 could not be performed without removal.

Furthermore, the water distribution pipe 31 and the heat insulating material 33
When the water leakage detection tape 32 is attached after the laying of the heat insulating material 33, the installation cannot be performed unless the laid heat insulating material 33 is removed extensively.

[0010]

A conventional water leakage detection device for a water distribution pipe using a water leakage detection tape has a problem that erroneous determination is caused by dew condensation on the outer periphery of the water distribution pipe.
In addition, when repairing the water leak detection device and attaching the water leak detection device to an already installed water distribution pipe, a wide range of heat insulating materials must be removed, and there is a problem that much work time is required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a water leakage detection device which can be easily repaired and newly installed without erroneous determination due to dew condensation.

[0012]

According to the present invention, there is provided a water leakage receiving tray attached to an outer periphery of a water distribution pipe, and a liquid level detecting means for detecting a liquid level in the water leakage receiving tray. A water leakage detection device for a water distribution pipe, wherein the water leakage is received by the water leakage receiving tray, and the water leakage of the water distribution pipe is detected based on the liquid level of the water leakage receiving tray.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of a water leakage detection device according to the present invention.

FIG. 1A shows a state in which a water distribution pipe is laid in the vertical direction, and FIG. 1B shows a water leakage tray which is a part of the present invention. In the figure, reference numeral 11 denotes a water distribution pipe, and reference numeral 12 denotes a heat insulating material. A part of the heat insulating material 12 covering the water distribution pipe 11 is cut off, and a water leakage receiving tray 13 is fixedly attached to the outer periphery of the water distribution pipe 11. The water leakage receiving tray 13 has a donut shape in its entirety, and has an inner wall portion 15 having a through hole 14 fitted to the outer peripheral surface of the water distribution pipe 11, and an inner wall portion 15.
An outer wall portion 16 provided at a position separated from the inner wall portion 15 by a predetermined distance, and an opening portion 17 having an open upper side above the inner wall portion 15 and the outer wall portion 16.
And a bottom portion 18 on the lower side.
5. The space surrounded by the outer wall portion 16 and the bottom portion 18 forms a leak receiving portion 19. In other words, in the water leakage receiving tray 13 attached to the water distribution pipe 11, liquid such as dew condensation or water leaking down along the water distribution pipe 11 is
The liquid flows into the water leak receiving portion 19 and the liquid is accumulated. On the other hand, a water leak detector 20 is attached and fixed to the heat insulating material 12 above the water leak receiving tray 13. The liquid level detection sensor 21 extending from the water leak detector 20 is disposed so as to be located in the water leak receiving portion 19 of the water leak receiving tray 13. The water leak detector 20 uses the liquid level signal detected by the liquid level detection sensor section 21 to generate liquid level position data in the water leak receiving section 19.
When the liquid level position data generated by the liquid level detector 20 exceeds a predetermined position data, some notification signal is generated to that effect.

In the water leakage detecting device having such a configuration,
When dew condensation occurs on the water distribution pipe 11, the dew drops as water droplets between the water distribution pipe 11 and the heat insulating material 12 and flows into the water leakage receiving portion 19 of the water leakage receiving tray 13 to be accumulated.
The liquid level detection sensor 21 detects the liquid level position of the liquid due to the accumulated dew droplets in the water leak receiving section 19,
The data is supplied to the liquid level detector 20 to generate liquid level position data, and is compared with predetermined position data. As a result of this comparison, if the data is equal to or less than the predetermined position data, the liquid level detected by the liquid level detection sensor unit 21 is determined to be liquid accumulated due to condensation.

Next, when the water distribution pipe 11 is corroded and damaged, and water is leaking from the corroded and damaged portion, the leaked liquid is supplied to the water leakage receiving portion of the water leakage receiving tray 13 in the same manner as the above-described water droplets of dew condensation. 19 and is accumulated. The liquid level data accumulated in the water leak receiving section 19 is generated by the liquid level detecting sensor section 21 and the liquid level detector 20, and is compared with predetermined position data. As a result of the comparison, when the data is equal to or more than the predetermined position data, the liquid level detected by the liquid level detection unit 21 is determined to be liquid accumulated due to water leakage.

If a liquid level equal to or higher than the predetermined position data is detected based on such a determination, the state of the liquid level is determined to be water leakage from the water distribution pipe 11 and the liquid level detector 20 is determined.
Generates a notification signal to notify appropriate maintenance personnel.

In the description of FIG. 1, the shape of the water leak receiving tray 13 is a donut shape, and the water distribution pipe 11 is fitted to the inner wall 15 of the donut shape.
When a new water distribution pipe 11 is laid, it can be easily fitted.
Since it is difficult to attach the same thing as shown in FIG. 2, as shown in FIG.
A hinge 22 is attached to one of the cut ends, and a fixing portion 23 is provided on the other side. After the water distribution pipe 11 is sandwiched by the inner wall 15, the fixing portion 23 is tightened with a screw or the like, so that the fixing can be performed. You may make it.

Further, the shape of the water leakage receiving tray 13 is changed to the inner wall 1.
5 needs to have the same shape as the outer shape of the water distribution pipe 11, but the outer wall 16 may have a rectangular shape, and any shape may be used as long as it can accumulate the liquid dropped along the water distribution pipe 11. It goes without saying.

Further, when the water distribution pipe 11 is laid in the vertical direction, the installation position of the water leakage tray 13 and the liquid level detector 20 and the like is located near the lowermost end of the water distribution pipe 11 so as to be vertically oriented. Even if water leaks from any part of the laid water distribution pipe 11, the leak can be detected. Also,
By installing the water leakage tray 13 and the liquid level detector 20 at a plurality of locations at predetermined intervals in the water distribution pipe 11 laid in the vertical direction, a location where a water leak has occurred is present above the location where the water leakage was detected. Therefore, the search range of the location where the water leak occurs can be narrowed, and the repair time can be shortened.

Next, with reference to FIG. 3, a description will be given of a water leakage detecting device when a water distribution pipe is laid in a horizontal direction. The same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. Further, the heat insulating material is omitted in the figure.

The shape of the water leakage tray 25 in this figure is a long gutter so as to be arranged along the water distribution pipe 11, and a water leakage detector 26 is provided at a specific position of the gutter-shaped tray 25. Have been. The water leak detecting section 26 is provided for disposing the liquid level detecting sensor section 21 of the liquid level detector 20, and is formed in a state like an evacuation route from a side surface of the trough-shaped tray 25. I have. That is, when water leaks from the water distribution pipe 11, the leaked liquid is accumulated in the gutter-shaped tray 25 and the water leak detector 26. The liquid level detected by the liquid level detection sensor section 21 is detected by the liquid level detection sensor section 21 and the liquid level data is generated by the liquid level detector 20 and is compared with the reference position data. In the same manner as in the case of laying the vertical water distribution pipe of the present invention, it is determined whether or not the liquid is caused by water leakage or condensation.

When the gutter-shaped leak receiving tray 25 is attached to a water distribution pipe covered with an existing heat insulating material, the water leak pipe permeated from the heat insulating material may be accumulated by mounting the water insulating pipe over the heat insulating material. Alternatively, by cutting off and attaching the heat insulating material of the water leak detecting section 26, the leaked liquid can be detected at an early stage because a large amount of liquid flows out from the cut portion of the heat insulating material. Also.

Although the embodiment of the present invention has been described above, it is not necessary to arrange the liquid level detection sensor section 21 at a position in contact with the water leakage receiving section 19 and the bottom inside the water leakage detection section 26. Since the amount of liquid accumulated in the water leakage trays 13 and 25 due to condensation is small and liquid level detection due to condensation is unnecessary, a slight liquid level detection position is arranged at a position distant from the bottom. This makes it easy to determine whether the liquid level is due to water leakage or liquid level due to condensation.

In the generation of the liquid level data by the liquid level detector 20, the change of the liquid level of the liquid accumulated in the water leakage trays 13 and 25 per unit time is observed, so that the liquid level change due to dew condensation is observed. Or whether the liquid level changes due to water leakage.

The amount of accumulated liquid due to condensation accumulated in the water leakage trays 13 and 25 is small. Since the liquid evaporates due to an increase in outside air temperature, the accumulated liquid due to condensation for several days is added. There is no erroneous determination of accumulated liquid due to water leakage.

Further, by providing drain holes 30 and 30 'at the bottom of the water leakage trays 13 and 25, dust and the like accumulated in the water leakage receiving portion 19 or the water leakage detecting portion 26 are periodically cleaned. Also, erroneous determination of liquid level detection can be prevented.

[0028]

As described above, according to the present invention, water leak detection of a water distribution pipe can be reliably determined without erroneous determination due to dew condensation, and can be easily attached to an existing laid water distribution pipe. Further, there is an effect that maintenance and inspection can be easily performed.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a water leakage detection device for a water distribution pipe according to the present invention, wherein FIG. 1 (a) is a cross-sectional view in which the water leakage detection device is attached to the water distribution pipe, and FIG. It is an expanded sectional view.

FIG. 2 is a perspective view showing another embodiment of the water leakage tray according to the present invention.

FIG. 3 shows another embodiment according to the present invention, and FIG.
2A is a sectional view, and FIG. 2B is a perspective view.

FIG. 4 shows a conventional water leakage detection device for a water distribution pipe;
FIG. 4A is a cross-sectional view illustrating a relationship between a water distribution pipe and a water leakage detection tape, and FIG. 4B is a plan view illustrating a relationship between a water leakage detection tape and a detection device.

[Explanation of symbols]

11 ... water distribution pipe, 12 heat insulation material, 13 water leakage tray, 20
Liquid level detector, 21 liquid level detection sensor unit.

Claims (5)

[Claims] 1. A water distribution pipe, comprising: a pipe for distributing liquid; a water leakage tray attached to an outer periphery of the water distribution pipe; and a liquid level detecting means for detecting a liquid level of the water flowing into the water leakage tray. Leaking water leaking down the pipe is collected in the leak receiving tray, the level of the collected leak is detected by the liquid level detecting means, and the water leak is determined based on the liquid level. Pipe leak detection device. 2. The water distribution pipe is installed in a vertical direction,
The water leakage detecting device for a water distribution pipe according to claim 1, wherein the water leakage receiving tray is attached near a lowermost point of the water distribution pipe or at a predetermined interval. 3. The water leakage detecting device for a water distribution pipe according to claim 1, wherein the water leakage receiving tray has a shape having at least an inner wall portion for fitting or holding the water distribution pipe and a water leakage receiving portion. . 4. The water distribution pipe is arranged in a horizontal direction,
A gutter-shaped leak receiving tray disposed below the water distribution pipe and along the pipe, a leak detecting unit provided at a predetermined position or at an interval of the leak receiving tray, and a leaked liquid accumulated in the leak detecting unit. The water leakage detecting device for a water distribution pipe according to claim 1, further comprising: a liquid surface detecting means for detecting a surface. 5. The liquid level detecting means detects the amount of change per unit time of the liquid level of the leaked liquid accumulated in the leak receiving tray,
The leak detection device for a water distribution pipe according to any one of claims 1 to 4, wherein when the amount of change per unit time is large, the occurrence of a leak is notified.