JP3559179B2 - Liquid leak detector and method of manufacturing the same - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid leak detector for detecting a liquid such as water or a chemical liquid attached to a wall surface, a floor surface, a device surface, a pipe joint, or the like inside a building, and a manufacturing method thereof.
[0002]
[Prior art]
Liquids such as water and chemicals adhered to water pipes, cooling water, air-conditioning condensate pipes themselves, or floors near them, floors where manufacturing equipment was installed, walls, floors, etc. In such a case, there are various types of liquid leak detectors that detect the presence of a liquid by generating an electric circuit through the liquid.
[0003]
As such a liquid leak detector, for example, there is one described in Japanese Patent Application Laid-Open No. Hei 5-187555, and FIG. 5 is a plan view of a belt-shaped water leak detecting band described in this patent, and FIGS. FIG. 6B is a cross-sectional view taken along line AA and BB of FIG. 5.
[0004]
In the water leakage detection band, two long conductors 10 are partially covered with an outer resin on an insulating cable housed in an insulating resin coating 11, and the outer edges of both sides are partially omitted. Has an exposed outer surface.
[0005]
This water leakage detection zone is installed on a floor or the like where water leakage is to be detected, usually at a plurality of locations in the longitudinal direction by being pressed in close contact with the floor or the like using fixing members, and two exposed conductors are provided. If water is present between the conductors 10 due to water leakage, water leakage is detected by utilizing the fact that a circuit for passing a current between the conductors 10 through the water is formed.
[0006]
[Problems to be solved by the invention]
However, in such a conventional water leakage detection band, the two exposed conductor portions serving as detection portions are located on both sides of the insulated cable, that is, at the most distant positions in the width direction of the insulated cable. In other words, if the water due to the leak does not reach from one side of the insulated cable to the other side, the leak cannot be detected, and further improvement in the detection performance is desired.
[0007]
Further, such a water leakage detection zone is installed by pressing a plurality of longitudinal portions at a plurality of locations in a longitudinal direction so as to be in close contact with the floor surface, for example, on a floor surface where water leakage is to be detected. If it occurs, water will enter the slight gap between the lower surface of the water leak detection zone and the floor due to the capillary phenomenon, and it will take time to recover the water that has invaded it. However, the fixing member has to be removed and the water leakage detection zone has to be once peeled off from the floor surface, and the water on the lower surface and the water on the floor surface must be wiped off with a water-absorbing material such as a waste cloth.
[0008]
The present invention has been made in view of the technical problem described above, and has a main object of improving detection performance. The purpose is to provide.
[0009]
[Means for Solving the Problems]
The present invention has the following configuration to achieve the above object.
[0010]
A liquid leakage detector according to claim 1 of the present invention is an insulated cable in which at least two conductors made of a corrosion-resistant material are housed in an insulating resin coating at an interval. The outer edges of both conductors are partially removed to expose the outer surfaces of both conductors, while the coating between the inner conductors in the width direction of the insulated cable is partially removed and the outer conductors are partially removed. The inner surfaces are respectively exposed, and the insulated cable has a projection formed on a surface on which the liquid leakage detection body is installed with respect to the liquid leakage detection target .
[0012]
Leak detection body according to claim 2 of the present invention, in the configuration of claim 1, wherein both the conductor is a conductor of the flat, at least in the upper and lower surfaces of the insulated cable corresponding to the upper and lower flat type wire The projection is formed on one surface, and a pair of the projections is formed along the longitudinal direction of the insulated cable except for at least a portion where the side surfaces of both conductors are exposed.
[0013]
According to a third aspect of the present invention, there is provided a method for manufacturing a liquid leakage detector, wherein at least two conductors made of a corrosion-resistant material are arranged at intervals and extruded and coated with an insulating resin to form one insulated cable. A step of partially punching out the coating on the outer edges on both sides of the insulated cable to expose the outer conductor surface; and partially punching out the coating between the two inner conductors in the width direction of the insulated cable to form the conductor inside. The method includes a step of exposing a side surface, and a step of forming a projection on a surface of the insulated cable on which the liquid leakage detection body is installed with respect to a liquid leakage detection target .
[0014]
According to a fourth aspect of the present invention, there is provided a method for manufacturing a liquid leakage detector according to the third aspect , wherein in the step of extruding and coating with an insulating resin into one insulated cable, the insulated cable is formed together with the extruded coating. The projections are formed on the installation surface when installed on the liquid leakage detection target.
[0015]
(Action)
According to the liquid leakage detector of the first aspect, the outer surfaces of both conductors are exposed by partially removing the outer edges on both sides of the insulated cable, while the outer conductors are covered between the inner conductors in the width direction of the insulated cable. Is partially removed to expose the inner surfaces of both conductors, so that when a liquid exists between the outer surfaces of the exposed conductors at both sides in the width direction of the insulated cable, a liquid leak can be detected as in the conventional case. The leak can be detected even when the leak exists between the inner surfaces of the exposed conductors at the inner position in the width direction of the insulated cable, the distance being shorter than the distance between the outer surfaces.
[0016]
Further , according to the liquid leakage detector of the first aspect, the insulated cable has a projection formed on an installation surface such as a floor surface when installed on a liquid leakage detection target. installation surface, becomes slightly lifted state from the floor surface or the like be placed with a gap, after the leak has occurred, to remove liquid between the such installation surface and the floor surface of the insulated cable At the time of restoration, there is no need to peel off the insulated cable from the floor or the like as in the conventional case, and it is possible to remove the liquid by sending hot air to the gap or bringing a water absorbing material or the like close to the gap.
[0017]
According to leak detection in accordance with claim 2, with a pair of projections formed along the longitudinal direction insulated cable can be installed stably on the leakage detection target, the exposed portion of the conductor serving as the detecting portions of the leak Does not have a pair of protrusions, so that the leaked liquid can smoothly enter the inside without being hindered by the protrusions and can be detected. The liquid can be smoothly removed from the exposed portion of the conductor serving as the liquid leakage detecting portion.
[0018]
According to the manufacturing method of the liquid leakage detector of the third aspect , the punching is performed after the extrusion coating, so that the liquid leakage detector of the present invention can be efficiently obtained.
[0019]
According to the method for manufacturing a liquid leakage detector according to the fourth aspect , the protrusion is formed during extrusion coating, whereby the liquid leakage detector of the present invention can be obtained efficiently.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0021]
( Embodiment of Comparative Example )
FIG. 1 is a plan view of a liquid leakage detector according to an embodiment of a comparative example , and FIGS. 2A and 2B are viewed from cutting plane lines AA and BB in FIG. 1, respectively. It is sectional drawing.
[0022]
In the liquid leakage detector according to this embodiment, two long conductors 1 are covered with an insulating resin 2 with a space therebetween to form an insulated cable 3, and outer edges on both sides of the insulated cable 3 are formed. The outer surfaces 1a of the two conductors 1 are respectively exposed by partially removing the coating, while the coating between the inner conductors 1 in the width direction (the vertical direction in FIG. 1) of the insulated cable 3 is partially removed. The inner side surfaces 1b of the two conductors 1 are exposed to be removed, respectively.
[0023]
The conductor 1 is made of a corrosion-resistant material such as stainless steel, tin-plated copper, a nickel alloy, or the like. In this embodiment, a flat stainless steel (SUS304) having a rectangular cross section is used in consideration of punching workability described later. ) Line. The thickness T1 and the width W1 of the conductor 1 having a rectangular cross section are, for example, 0.3 mm and 2 mm, and the interval W2 between the two conductors 1 is, for example, 3.5 mm.
[0024]
The insulating resin 2 covering the conductor 1 is preferably made of a material considering water resistance and chemical resistance, for example, vinyl chloride, tetrafluoroethylene, polyethylene, polyimide, and the like. In this embodiment, a vinyl chloride resin is used. ing.
[0025]
The insulated cable 3 in which the conductor 1 is covered with the insulating resin 2 has a thickness T2 of a portion of the conductor 1 and a thickness T3 of a portion between the conductors 1 are, for example, 1.2 mm and 0.5 mm. The width W3 is, for example, 8 mm.
[0026]
This liquid leak detector detects liquid caused by liquid leak existing between the two conductors 1, and therefore, as described above, partially exposes the outer surface 1 a and the inner surface 1 b of the conductor 1. Let me.
[0027]
In other words, the insulated cable 3 is formed by punching out the outer edges on both sides of the insulated cable 3 at a constant interval L1, for example, at an interval of 20 mm along the longitudinal direction (the left-right direction in FIG. 1). Are exposed, while the coating between the two conductors 1 on the inner side in the width direction of the insulated cable 3 is removed by punching, and the inner side surfaces 1b of the two conductors 1 are exposed.
[0028]
The coating on both sides of the insulated cable 3 has a length L2 removed along the longitudinal direction, for example, over 2 mm, and a width W4, for example, such that the conductor 1 is exposed in the width direction. It has been removed over 0.25 mm.
[0029]
The coating on the inside of the insulated cable 3 is punched out in a substantially rectangular shape, and the length L3 is removed along the longitudinal direction, for example, over 4 mm, and the conductor 1 has the same length as the outer surface 1a. Exposure over L2. The inner punched portion is punched in an arc at the corner.
[0030]
Next, a method of manufacturing the liquid leakage detector having the above configuration will be described.
[0031]
In the method for manufacturing a liquid leakage detector according to this embodiment, two flat stainless steel wires, which are conductors 1, are arranged side by side at intervals and supplied to a coating extruder having a double crosshead die. The insulating cable 3 is extruded while being covered with a flame-retardant vinyl chloride resin.
[0032]
Next, the outer surface 1a and the inner surface 1b of the conductor 1 are exposed by punching out the insulated cable 3 with a press machine to the extent that the outside and inside of the stainless wire are slightly cut using a punching die, and the liquid leakage detection shown in FIG. Got a body.
[0033]
The punching on the outside and the punching on the inside of the insulated cable 3 are preferably performed simultaneously, but may be performed sequentially.
[0034]
According to the liquid leakage detector of this embodiment, when the liquid is to be detected, for example, when it is installed on the floor, the liquid due to the liquid leakage exists between the exposed conductors 1. Then, it is possible to detect liquid leakage by utilizing the fact that a circuit for passing current between the two conductors 1 is formed via the liquid.
[0035]
Moreover, unlike the conventional example, not only the outer surface 1a of the conductor 1 on both sides of the insulated cable 3 is exposed, but also the inner surfaces 1b of the inner conductor 1 of the insulated cable 3 which are shorter than each other. Since the portion is exposed, the liquid existing between the outer surfaces 1a of the two conductors 1 can be detected as in the conventional example, and between the outer surface 1a of one conductor 1 and the inner surface 1b of the other conductor 1. The existing liquid and the liquid existing between the inner side surfaces 1b of both conductors 1 can be detected, and the detection performance is improved.
[0036]
( Embodiment of the present invention )
FIG. 3 is a plan view of the liquid leakage detector according to the embodiment of the present invention, and FIGS. 4 (a) and 4 (b) are viewed from cutting plane lines AA and BB in FIG. 3, respectively. FIG. 3 is a cross-sectional view, and portions corresponding to the above-described embodiment are denoted by the same reference numerals.
[0037]
Leak detection of this embodiment, two conductors 1 long is, is in insulated cable 3 ₁ are formed is coated with an insulating resin 2 ₁ while spaced, the insulated cable 3 ₁ The outer surfaces 1a of both conductors 1 are respectively exposed by partially removing the coating of the outer edges on both sides, while the coating between both conductors 1 on the inner side in the width direction of the insulated cable 3 is partially removed. The inner surface 1b of the conductor 1 is configured to be exposed, and the above configuration is the same as in the above-described embodiment.
[0038]
In this embodiment, the leak detection material is a leak detection target to be detected a leakage, for example, placed on the floor, after detecting the leakage, the installation surface and the floor surface of the insulated cable 3 ₁ In order to facilitate the operation at the time of recovery except for the liquid during the recovery, the following configuration is adopted.
[0039]
That is, in this embodiment, the insulated cable 3 is formed with a pair of protrusions 4 extending in the longitudinal direction along the inner side surfaces 1b of both conductors 1 on the upper and lower surfaces. This projection has a height of, for example, 0.2 to 0.3 mm, and the projection 4 is punched out and removed at the portion where the conductor 1 is exposed at the same time as coating.
[0040]
The liquid leak detector according to this embodiment extrudes the protrusions 4 simultaneously when the conductor 1 is coated with the insulating resin 2 by an extruder. It is performed in the same manner as the form.
[0041]
In the liquid leakage detector according to this embodiment, as an object to be detected for detecting liquid leakage, for example, when installed on the floor, the upper surface or lower surface of the insulated cable 3 is the installation surface. Since the above-mentioned protrusion 4 is formed on the upper surface or the lower surface of the insulated cable 3, when the insulated cable 3 is installed on the floor, the protrusion 4 causes the protrusion 4 to move between the installation surface of the insulated cable 3 and the floor. Will result in a slight gap.
[0042]
Therefore, when the liquid between the installation surface and the floor surface of the insulated cable 3 is removed after detecting the liquid leakage, a liquid absorbing material or the like is removed by bringing the liquid absorbing material or the like close to the gap, or It is possible to easily remove the liquid by blowing hot air into the gap, and to remove the liquid that has invaded by the capillary phenomenon between the installation surface of the insulated cable and the floor, as in the conventional example, It is not necessary to perform a troublesome operation such as peeling off the floor from the floor surface and wiping the insulating cable and the floor surface with a waste cloth.
[0043]
In particular, since the pair of protrusions 4 are removed by punching out the portion where the conductor 1 is exposed, the liquid due to the leakage smoothly flows into the inside of the insulated cable 3 while the insulation after the leakage detection is restored. The liquid that has entered the punched portion inside the cable 3 can be smoothly removed outward.
[0044]
Further, in order to detect a liquid leak at a joint portion of a metal pipe or the like, the liquid leak detector is used by winding the insulated cable 3 around the pipe. The exposed conductor may erroneously be detected as leaking liquid by contacting the pipe.To prevent such erroneous detection, wrap the insulated cable with a fiber mesh tube, etc. Although it was necessary to prevent contact with the pipe, in the liquid leakage detector of this embodiment, the projection prevents the exposed portion of the conductor 1 from contacting the metal pipe. It is not necessary to use a mesh tube or the like.
[0045]
Other configurations and effects are the same as those of the above-described embodiment.
[0046]
In this embodiment, the projections 4 are formed on both the upper and lower surfaces so that the upper and lower surfaces of the insulated cable 3 can be used as the installation surface. However, when only one of the upper and lower surfaces is used as the installation surface, The protrusion 4 may be formed only on the one surface.
[0047]
In this embodiment, the projections 4 are removed by punching at the portions where the conductors 1 are exposed. However, as another embodiment of the present invention, the positions of the projections 4 are shifted in the width direction to move the projections 4 in the longitudinal direction. It may be provided over the entire length.
[0048]
In this embodiment, the protrusion 4 is removed only at the portion where the conductor 1 is exposed, but as another embodiment of the present invention, the protrusion at the portion other than the portion where the conductor 1 is exposed is also removed. Is also good.
[0049]
In this embodiment, the protrusions 4 are formed along the longitudinal direction. However, as another embodiment of the present invention, instead of the longitudinal direction, the protrusions 4 are formed along the width direction or the oblique direction of the insulated cable 3. Is also good.
[0050]
In this embodiment, the projections 4 are formed continuously, but as another embodiment of the present invention, discontinuous point-shaped projections may be provided along the longitudinal direction or the like.
[0051]
In this embodiment, the projections 4 are provided in a pair so as to extend in the longitudinal direction. However, as another embodiment of the present invention, one projection is formed so as to extend in the longitudinal direction at a center position in the width direction, for example. Alternatively, three or more protrusions extending in the longitudinal direction may be provided at appropriate positions in the width direction.
[0052]
(Other embodiments)
In each of the above-described embodiments, a flat conductive wire is used as the conductor 1. However, the present invention is not limited to a flat conductor, and may have a circular cross section or another shape.
[0053]
In each of the above embodiments, the exposed portion of the conductor 1 is provided symmetrically. However, as another embodiment of the present invention, the exposed portion of the conductor 1 may be provided asymmetrically.
[0054]
Further, in each of the above-described embodiments, the exposed portion of the outer surface 1a and the exposed portion of the inner surface 1b of the conductor 1 are arranged at the same position in the longitudinal direction. However, as another embodiment of the present invention, The positions in the longitudinal direction may be shifted.
[0055]
Further, in each of the above-described embodiments, the arrangement interval in the longitudinal direction of the exposed portion of the conductor 1 is fixed. However, as another embodiment of the present invention, the arrangement interval may be different.
[0056]
The removal of the insulating resin coating is not limited to punching, but may be performed by melting or other methods.
[0057]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
[0058]
According to the first aspect of the present invention, the outer surfaces of both conductors are exposed by partially removing the outer edge portions on both sides of the insulated cable, and the coating between the inner conductors in the width direction of the insulated cable is partially removed. As described above, since the inner side surfaces of both conductors are exposed, as in the conventional case, when liquid exists between the outer side surfaces of the exposed conductors at both sides in the width direction of the insulated cable, the liquid leakage can be detected, Even when liquid is present between the inner surfaces of the exposed conductors located at an inner position in the width direction of the cable, which is shorter than the distance between the outer surfaces, the liquid leakage can be detected, and the detection performance is improved.
[0059]
According to the first aspect of the present invention, since the insulated cable is provided with a projection on the installation surface when the insulated cable is installed on the liquid leakage detection target, the installation surface of the insulated cable is leaked by the projection. It will be installed with a gap in a state that it is slightly raised from the object to be detected, and after leaking, when removing and recovering the liquid under the installation surface of the insulated cable, as in the past, There is no need to peel off the insulated cable from the liquid leakage detection target, and hot air can be sent to the gap or a liquid absorbing material can be brought close to the gap to remove the liquid.
[0060]
Furthermore, when detecting the leakage of the pipe by wrapping the insulated cable around a metal pipe, the projection effectively prevents the exposed conductor of the insulated cable from coming into contact with the pipe. Incorrect detection can be prevented without wrapping the insulated cable in the mesh tube.
[0061]
According to the second aspect of the present invention, a pair of protrusions formed along the longitudinal direction allows the insulated cable to be stably installed on the liquid leakage detection target, and the exposed portion of the conductor serving as the liquid leakage detection portion is provided. Since a pair of projections is not formed, the leaked liquid can smoothly enter the inside and can be detected. On the other hand, at the time of recovery after the leak, the liquid between the pair of projections can detect the leaked liquid. The part will be removed smoothly.
[0062]
According to the third aspect of the present invention, by performing punching after extrusion coating, the liquid leakage detector of the present invention can be efficiently obtained.
[0063]
According to the fourth aspect of the present invention, the protrusion is formed at the time of extrusion coating, whereby the liquid leakage detector of the present invention can be efficiently obtained.
[Brief description of the drawings]
FIG. 1 is a plan view of a liquid leakage detector according to an embodiment of a comparative example .
FIG. 2 is a sectional view of FIG.
FIG. 3 is a plan view of a liquid leakage detector according to one embodiment of the present invention.
FIG. 4 is a sectional view of FIG. 3;
FIG. 5 is a conventional plan view.
FIG. 6 is a sectional view of FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Conductor 1a Outer side surface 1b Inner side surface 2 Insulating resin 3 Insulated cable 4 Projection

Claims (4)

In an insulated cable in which at least two conductors made of a corrosion-resistant material are accommodated in an insulating resin coating at an interval, the coating on the outer edges on both sides of the insulated cable is partially removed. While the outer surfaces of both conductors are respectively exposed, the coating between the inner conductors in the width direction of the insulated cable is partially removed to expose the inner surfaces of both conductors , and the insulated cable is A liquid leakage detector, wherein a projection is formed on a surface on which the liquid leakage detector is installed with respect to a liquid leakage detection target . The two conductors are flat conductors, and the protrusions are formed on at least one of the upper and lower surfaces of the insulated cable corresponding to the upper and lower sides of the flat conductors, and the protrusions have at least side surfaces of both conductors. The liquid leakage detector according to claim 1 , wherein a pair is formed along a longitudinal direction of the insulated cable except for an exposed portion . A step of arranging at least two conductors made of a corrosion-resistant material at an interval, extruding and coating with an insulating resin to form one insulated cable, and partially covering outer edges on both sides of the insulated cable. A step of punching to expose a conductor outer surface, and a step of partially punching out a coating between both conductors on the inner side in the width direction of the insulated cable to expose a conductor inner surface,
A step of forming a projection on a surface of the insulated cable on which the liquid leak detector is installed with respect to a liquid leak detection target,
A method for producing a liquid leakage detector , comprising : 4. The process of extrusion-coating with an insulating resin to form a single insulated cable, wherein a protrusion is formed on an installation surface of the insulated cable when installed on a liquid leakage detection target, together with the extrusion coating. Method for manufacturing a liquid leak detector of the present invention.

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