JP2011215076A - Liquid leak detecting seal and device for detecting liquid leak - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a liquid leakage detecting seal and a device for detecting liquid leakage which can prevent misdetections due to moisture, using a simple structure.SOLUTION: When water leaks in a connecting part of first piping and second piping so that water is stored in a tube fitting, a transparent film 34 of a water leakage detecting seal 18 is immersed in water. Thus, a water-soluble resin 38 which blocks a through-hole 36 of the transparent film 34 is dissolved in the water so that the water enters the transparent film 34 through the through-hole 36, from the outer part of the transparent film 34. As a result, a detecting sheet 30 in the transparent film 34 is brought into contact with the water and a pattern is changed, and the change in the detecting sheet 30 can be visually recognized from the window part 16D of a tube fitting 16.

Description

  The present invention relates to a liquid leakage detection seal and a liquid leakage detection device used for a joint portion of a tubular body through which liquid flows.

  Patent Document 1 describes a configuration in which an outer periphery of a pipe joint is covered and sealed with a cover body, and a penetrating member is provided that allows the liquid to permeate and flow from the inside of the cover body to the outside. And the display means which reacts with the liquid which flowed out through the penetration member and displays it in the color is provided inside the penetration member which protrudes outside the cover body. It is now possible to discover liquid leaks from

JP 2004-183849 A

  However, in Patent Document 1, an absorbent member made of white fiber rod is inserted into a liquid receiving tube made of transparent plastic, and a water-soluble capsule sealed with a reactant made of litmus powder is attached to the upper end of the absorbent member. ing. Further, the display member is structured by attaching to the upper surface of the capsule so as to protrude from the upper end opening of the penetrating member liquid receiving tube made of a hard fiber rod, and is positioned below the plurality of small holes formed in the cover body. The upper end of the permeation member of the display member is attached to the small hole in contact with the permeation member. For this reason, the structure is complicated and cannot be easily attached to the joint.

  An object of the present invention is to obtain a liquid leakage detection seal and a liquid leakage detection device that can prevent erroneous detection due to moisture with a simple structure in consideration of the above facts.

  The liquid leak detection seal according to the first aspect of the present invention includes a detection sheet in which at least one of a color or a pattern changes when the leaked liquid is touched, and the change around the detection sheet is visibly visible. A detection sheet covering member provided at least in part with a liquid-soluble portion that is soluble by the liquid.

  In the liquid leak detection seal according to claim 1, the detection sheet covering member surrounds the detection sheet whose color or pattern changes when it touches the leaked liquid. For this reason, the detection sheet covering member can prevent the detection sheet from reacting with moisture. As a result, the detection sheet can be prevented from being erroneously detected. On the other hand, when the liquid leaks, the liquid-soluble portion provided on at least a part of the detection sheet covering member is dissolved by the leaked liquid, and the liquid touches the detection sheet, so that the color or pattern of the detection sheet At least one of these changes, and this change can be visually observed. Further, since the periphery of the detection sheet is covered with the detection sheet covering member, the structure is simple.

  According to a second aspect of the present invention, in the liquid leak detection seal according to the first aspect, the detection sheet covering member includes a transparent film that covers the periphery of the detection sheet, and the liquid-soluble portion is formed on the detection sheet covering member. And a liquid-soluble member that closes the through-hole and dissolves with the liquid.

  In the liquid leak detection seal according to claim 2, the detection sheet covering member surrounds the detection sheet whose color or pattern changes when it touches the leaked liquid. For this reason, it can prevent that a detection sheet reacts with humidity. As a result, the detection sheet can be prevented from being erroneously detected. On the other hand, when liquid leaks, the liquid-soluble member that closes the through-hole formed in the detection sheet covering member is dissolved by the leaked liquid, and the liquid that has flowed from the through-hole touches the detection sheet. At least one of the color or pattern of the sheet changes, and this change can be visually observed through the transparent film. Moreover, since the periphery of the detection sheet is covered with a transparent film, the structure is simple.

    According to a third aspect of the present invention, in the liquid leak detection seal according to the first aspect, the detection sheet covering member includes a liquid-soluble member that covers the periphery of the detection sheet and is melted by the liquid.

  In the liquid leak detection seal according to the third aspect, the detection sheet covering member surrounds the detection sheet whose color or pattern changes when it touches the leaked liquid. For this reason, it can prevent that a detection sheet reacts with humidity. As a result, the detection sheet can be prevented from being erroneously detected. On the other hand, when the liquid leaks, the liquid-soluble member that covers the periphery of the detection sheet is dissolved by the leaked liquid, and when the liquid touches the detection sheet, at least one of the color or pattern of the detection sheet changes. This change can be visually observed. Further, since the periphery of the detection sheet is covered with a liquid-soluble member, the structure is simple.

  According to a fourth aspect of the present invention, in the liquid leak detection seal according to the second or third aspect, the liquid-soluble member is a water-soluble resin.

  In the liquid leak detection seal according to the fourth aspect, since the liquid-soluble member is a water-soluble resin, it is possible to reliably prevent the detection sheet from reacting with moisture and to reliably detect water leak.

  The liquid leakage detection device according to claim 5, wherein at least one of a color and a pattern changes when touching the leaked liquid, and the change is visibly covered around the detection sheet, and is melted by the liquid. A liquid leakage detection seal having a detection sheet covering member provided at least in part with a liquid soluble portion, and a pipe joint provided with the liquid leakage detection seal.

  In the liquid leakage detection device according to claim 5, the periphery of the detection sheet whose color or pattern changes when it touches the liquid leaked from the pipe joint is covered with a detection sheet covering member that allows the detection sheet to be visually observed. Yes. For this reason, the detection sheet covering member can prevent the detection sheet from reacting with moisture. As a result, the detection sheet can be prevented from being erroneously detected. On the other hand, when the liquid leaks from the pipe joint, the liquid-soluble part provided in at least a part of the detection sheet covering member is dissolved by the leaked liquid, and the liquid touches the detection sheet. At least one of the color or the pattern changes, and this change can be visually observed. Further, since the periphery of the detection sheet is covered with the detection sheet covering member, the structure is simple.

  According to a sixth aspect of the present invention, in the liquid leakage detection apparatus according to the fifth aspect, the detection sheet covering member includes a transparent film that covers the periphery of the detection sheet, and the liquid-soluble portion is formed on the detection sheet covering member. And a liquid-soluble member that closes the through-hole and dissolves with the liquid.

  In the liquid leakage detection device according to the sixth aspect, the detection sheet covering member surrounds the detection sheet whose color or pattern changes when it touches the liquid leaking from the pipe joint. For this reason, it can prevent that a detection sheet reacts with humidity. As a result, the detection sheet can be prevented from being erroneously detected. On the other hand, when liquid leaks from the pipe joint, the liquid-soluble member that closes the through hole formed in the detection sheet covering member is melted by the leaked liquid, and the liquid that has flowed from the through hole touches the detection sheet. Thus, at least one of the color or pattern of the detection sheet changes, and this change can be visually observed through the transparent film. Moreover, since the periphery of the detection sheet is covered with a transparent film, the structure is simple.

  A seventh aspect of the present invention is the liquid leakage detection apparatus according to the fifth aspect, wherein the detection sheet covering member includes a liquid-soluble member that covers the periphery of the detection sheet and is melted by the liquid.

  In the liquid leakage detection device according to claim 7, the detection sheet covering member surrounds the detection sheet in which at least one of the color and the pattern changes when the liquid leaking from the pipe joint is touched. For this reason, it can prevent that a detection sheet reacts with humidity. As a result, the detection sheet can be prevented from being erroneously detected. On the other hand, when the liquid leaks, the liquid-soluble member that covers the periphery of the detection sheet is dissolved by the leaked liquid, and when the liquid touches the detection sheet, at least one of the color or pattern of the detection sheet changes. This change can be visually observed. Further, since the periphery of the detection sheet is covered with a liquid-soluble member, the structure is simple.

  An eighth aspect of the present invention is the liquid leakage detection device according to any one of the fifth to seventh aspects, wherein the pipe joint has a transparent portion where the liquid leakage detection seal provided therein can be visually observed.

  In the liquid leak detection device according to claim 8, when the liquid leak detection seal is provided inside the pipe joint, it is easy to change at least one of the color or pattern of the liquid leak detection seal through the transparent portion of the pipe joint. Can be confirmed. For this reason, it is possible to confirm the change of the liquid leak detection seal without disassembling the pipe joint.

  According to a ninth aspect of the present invention, in the liquid leak detection device according to any one of the sixth to eighth aspects, the liquid-soluble member is a water-soluble resin.

  In the liquid leakage detection device according to the ninth aspect, since the liquid-soluble member is a water-soluble resin, it is possible to reliably prevent the detection sheet from reacting with moisture and to reliably detect water leakage.

  As described above, the liquid leak detection seal according to the first aspect of the present invention can prevent erroneous detection due to moisture with a simple structure.

  The liquid leak detection seal according to the second aspect of the present invention can prevent erroneous detection due to moisture with a simple structure.

  The liquid leak detection seal according to the third aspect of the present invention can prevent erroneous detection due to moisture with a simple structure.

  The liquid leak detection seal according to the fourth aspect of the present invention can reliably prevent the detection sheet from reacting with moisture and can reliably detect water leakage.

  The liquid leak detection device of the present invention according to claim 5 can prevent erroneous detection due to moisture with a simple structure.

  The liquid leak detection apparatus according to the sixth aspect of the present invention can prevent erroneous detection due to moisture with a simple structure.

  The liquid leak detection device according to the seventh aspect of the present invention can prevent erroneous detection due to moisture with a simple structure.

  The liquid leak detection device according to the eighth aspect of the present invention can confirm the change of the liquid leak detection seal without disassembling the pipe joint.

  The liquid leak detection apparatus according to the ninth aspect of the present invention can reliably prevent the detection sheet from reacting with moisture and can reliably detect water leakage.

It is a top view which shows the liquid leak detection apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the liquid leak detection apparatus which concerns on 1st Embodiment of this invention. It is a top view which shows the liquid leak detection state of the liquid leak detection apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the liquid leak detection state of the liquid leak detection apparatus which concerns on 1st Embodiment of this invention. It is a top view which shows the liquid leak detection seal | sticker which concerns on 1st Embodiment of this invention. It is a section which shows the liquid leak detection seal concerning a 1st embodiment of the present invention. It is a top view which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 1st Embodiment of this invention. It is a top view which shows the liquid leak detection seal | sticker which concerns on 2nd Embodiment of this invention. It is a cross section which shows the liquid leak detection seal | sticker which concerns on 2nd embodiment of this invention. It is a top view which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 2nd Embodiment of this invention. It is a top view which shows the liquid leak detection seal | sticker which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the liquid leak detection seal | sticker which concerns on 3rd Embodiment of this invention. It is a top view which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 3rd Embodiment of this invention. It is a top view which shows the liquid leak detection seal | sticker which concerns on 4th Embodiment of this invention. It is sectional drawing which shows the liquid leak detection seal | sticker which concerns on 4th Embodiment of this invention. It is a top view which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 4th Embodiment of this invention. It is sectional drawing which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 4th Embodiment of this invention. It is a top view which shows the liquid leak detection seal | sticker which concerns on 5th Embodiment of this invention. It is sectional drawing which shows the liquid leak detection seal | sticker which concerns on 5th Embodiment of this invention. It is a top view which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 5th Embodiment of this invention. It is sectional drawing which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 5th Embodiment of this invention. It is a top view which shows the liquid leak detection seal | sticker which concerns on 6th Embodiment of this invention. It is sectional drawing which shows the liquid leak detection seal | sticker which concerns on 6th Embodiment of this invention. It is a top view which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 6th Embodiment of this invention. It is sectional drawing which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 6th Embodiment of this invention. It is a top view which shows the liquid leak detection seal | sticker which concerns on 7th Embodiment of this invention. It is sectional drawing which shows the liquid leak detection seal | sticker which concerns on 7th Embodiment of this invention. It is a top view which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 7th Embodiment of this invention. It is sectional drawing which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 7th Embodiment of this invention. It is a top view which shows the liquid leak detection apparatus which concerns on 8th Embodiment of this invention. It is sectional drawing which shows the liquid leak detection apparatus which concerns on 8th Embodiment of this invention. It is a top view which shows the liquid leak detection seal | sticker which concerns on 8th Embodiment of this invention. It is sectional drawing which shows the liquid leak detection seal | sticker which concerns on 8th Embodiment of this invention. It is a top view which shows the mount based on 8th Embodiment of this invention. It is a top view which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 8th Embodiment of this invention. It is sectional drawing which shows the liquid leak detection state of the liquid leak detection seal | sticker which concerns on 8th Embodiment of this invention. It is a top view which shows the liquid leak detection state of the mount based on 8th Embodiment of this invention. It is a top view which shows the other example in 8th Embodiment of this invention. It is a top view which shows the liquid leak detection state of the other example in 8th Embodiment of this invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a plan view showing a liquid leak detection apparatus according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the liquid leak detection apparatus according to the first embodiment of the present invention.

  As shown in FIG. 1, the water leakage detection device 10 as an example of the liquid leakage detection device of the present embodiment includes a pipe joint 16 such as a push lock disposed at a coupling portion between the first piping 12 and the second piping 14, A water leakage detection seal 18 is provided as an example of the liquid leakage detection seal. The first pipe 12 and the second pipe 14 are pipes such as metal pipes and vinyl chloride pipes.

  As shown in FIG. 2, the pipe joint 16 is attached to the end 14 </ b> A of the second pipe 14, and the second pipe 14 is passed through the through hole 20 formed in the bottom 16 </ b> A of the pipe joint 16. The open end 16B of the pipe joint 16 extends beyond the end 14A of the second pipe 14.

  The end 12A of the first pipe 12 inserted into the open end 16B of the pipe joint 16 is inserted between the end 14A of the second pipe 14 and the cylinder part 16C of the pipe joint 16. Further, two O-rings 22 as an example of a water stop means are disposed between the end portion 12A of the first pipe 12 and the end portion 14A of the second pipe 14. In FIG. 2, the pipe joint 16 is shown in a simplified manner, and other members such as a stop ring for preventing the end portion 12A of the first pipe 12 from being omitted are omitted.

  The water leak detection seal 18 is attached to the outer peripheral portion near the tip of the end portion 12A of the first pipe 12. Further, a window portion 16 </ b> D as a transparent portion is formed in the vicinity of the bottom portion 16 </ b> A in the tubular portion 16 </ b> C of the pipe joint 16. The window portion 16D is formed in the outer peripheral direction of the water leakage detection seal 18 so that the water leakage detection seal 18 can be seen from the outside of the pipe joint 16 through the window portion 16D.

  Therefore, as shown in FIG. 3 and FIG. 4, when water W leaks into the pipe joint 16 as an example of the liquid from the joint between the first pipe 12 and the second pipe 14, The change of the water leak detection seal 18 can be visually observed from the outside through the window portion 16D.

Next, the water leak detection seal 18 will be described.
As shown in FIG.5 and FIG.6, the water leak detection seal | sticker 18 is provided with the detection sheet | seat 30 made into the film form. When the detection sheet 30 touches the water W, at least one of the color and the pattern changes. For example, the detection sheet 30 is dot-treated with water-based ink, and the pattern (dot) changes (is lost and colored) when touched with water. Note that water sensitive paper can also be used as the detection sheet 30.

  The lower surface 30A of the detection sheet 30 is fixed to the upper surface 32A of the adhesive material 32 that constitutes a part of the detection sheet covering member. The adhesive material 32 is larger than the detection sheet 30, and the outer peripheral portion 32 </ b> B of the adhesive material 32 protrudes from the outer peripheral portion of the detection sheet 30 by a predetermined width L <b> 1. Further, the adhesive material 32 is bonded to the outer peripheral surface of the end portion 12 </ b> A of the first pipe 12.

  Further, the upper surface 30B, the short side surfaces 30C and 30D, and the long side surfaces 30E and 30F excluding the lower surface 30A of the detection sheet 30 are covered with a transparent film 34 constituting a part of the detection sheet covering member. That is, the lower surface 30 </ b> A of the detection sheet 30 is covered with the adhesive material 32, and all other parts except the lower surface 30 </ b> A are covered with the transparent film 34.

  The long side surfaces 34C and 34D of the transparent film 34 are formed with a plurality of through holes 36 as liquid-soluble portions at predetermined intervals in the longitudinal direction. These through holes 36 connect the outside of the transparent film 34 and the inside of the transparent film 34 provided with the detection sheet 30.

  Each through-hole 36 constitutes a part of the detection sheet covering member that is melted by water as a liquid, and is closed by a water-soluble resin 38 as an example of a liquid-soluble member. The water-soluble resin 38 maintains a state of closing the through-hole 36 with moisture, but melts when immersed in water so that the through-hole 36 penetrates.

  The water-soluble resin 38 is preferably a hydrophilic resin or a sealable material that is soluble in water. For example, polyvinyl alcohol (in the form of film, Hicelon manufactured by Mitsubishi Chemical and Nippon Synthetic Chemical, modified polyvinyl acetate (Bovar, Excelbar manufactured by Clera), water-soluble polysilane having an alkyl group, and the like. Examples of liquid-soluble members other than the resin 38 include starch (glue), wafer (gelatin), agar, and carragina.

  Therefore, when the transparent film 34 is immersed in water, the water-soluble resin 38 closing the through hole 36 is dissolved. For this reason, as shown in FIGS. 7 and 8, water W enters the transparent film 34 from the outside of the transparent film 34 through the through holes 36. As a result, the detection sheet 30 inside the transparent film 34 comes into contact with the water W, and the pattern (dots) changes (is lost and colored).

Next, the operation and effect of this embodiment will be described.
In this embodiment, as shown in FIG.1 and FIG.2, the leak detection seal | sticker provided in the inside of the pipe joint 16 from the window part 16D of the pipe joint 16 arrange | positioned in the coupling | bond part of the 1st piping 12 and the 2nd piping 14. As shown in FIG. 18 is visible. As shown in FIGS. 5 and 6, the detection sheet 30 of the water leak detection seal 18 has the lower surface 30 </ b> A covered with the adhesive material 32 and all other parts except the lower surface 30 </ b> A are covered with the transparent film 34. Yes. Further, the through hole 36 of the transparent film 34 is closed with a water-soluble resin 38, and the water-soluble resin 38 maintains a state of closing the through hole 36 with moisture. For this reason, when water leakage does not occur at the joint between the first pipe 12 and the second pipe 14, the pattern of the detection sheet 30 does not change due to moisture. It can confirm visually from window part 16D.

  On the other hand, as shown in FIG. 3 and FIG. 4, when water leaks at the joint between the first pipe 12 and the second pipe 14 and water W accumulates inside the pipe joint 16, the transparent film 34. Is immersed in water W. For this reason, the water-soluble resin 38 closing the through hole 36 is melted, and water W enters from the outside of the transparent film 34 through the through hole 36 into the transparent film 34 as shown in FIGS. . As a result, the detection sheet 30 inside the transparent film 34 touches the water W, and the pattern (dots) changes (disappears and becomes colored), and the change of the detection sheet 30 is visually confirmed from the window portion 16D of the pipe joint 16. it can.

  Therefore, in the water leakage detection seal 18 and the water leakage detection device 10 of the present embodiment, it is possible to prevent erroneous detection due to moisture with a simple structure, and it is easy to change the water leakage detection seal 18 provided inside the water leakage detection device 10 due to water leakage. I can confirm.

  Moreover, in this embodiment, the change by the water leak of the water leak detection seal | sticker 18 can be confirmed from window part 16D as a transparent site | part of the pipe joint 16. FIG. For this reason, even if it does not decompose | disassemble the pipe joint 16, the change of the water leak detection seal | sticker 18 can be confirmed. In addition, it is possible to detect a minute water leak due to insufficient insertion, foreign object pinching, and piping (pipe) abnormality during construction of the pipe joint 16, and to prevent a serious water leak accident.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS.
In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 9 and 10, in the present embodiment, a plurality of through holes 40 as liquid-soluble portions are formed in the upper wall portion 34 </ b> E that covers the upper surface 30 </ b> B of the detection sheet 30 in the transparent film 34 of the water leakage detection seal 18. ing. These through holes 40 connect the outside of the transparent film 34 and the inside of the transparent film 34 provided with the detection sheet 30.

  Each through hole 40 is closed with a water-soluble resin 38. The water-soluble resin 38 maintains a state of closing the through-hole 40 with moisture, but melts when immersed in water W so that the through-hole 40 penetrates.

  Therefore, when the transparent film 34 is immersed in water, the water-soluble resin 38 closing the through hole 40 is dissolved. For this reason, as shown in FIGS. 11 and 12, water W enters the transparent film 34 from the outside of the transparent film 34 through the through holes 40. As a result, the detection sheet 30 inside the transparent film 34 comes into contact with the water W, and the pattern (dots) changes (is lost and colored).

  Therefore, also in this embodiment, the same operation and effect as the first embodiment can be obtained.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS.
In addition, about the same member as 1st, 2 embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 13 and 14, in the present embodiment, a plurality of through holes 36 are formed in the long side surfaces 34 </ b> C and 34 </ b> D of the transparent film 34, and a plurality of through holes 40 are formed in the upper wall portion 34 </ b> E of the transparent film 34. Is formed. The through holes 36 and 40 are each closed with a water-soluble resin 38. The water-soluble resin 38 maintains a state of closing the through holes 36 and 40 with moisture, but dissolves when immersed in water so that the through holes 36 and 40 penetrate.

  Therefore, when the transparent film 34 is immersed in water, the water-soluble resin 38 closing the through holes 36 and 40 is dissolved. For this reason, as shown in FIGS. 15 and 16, the water W enters the inside of the transparent film 34 through the through holes 36 and 40 from the outside of the transparent film 34. As a result, the detection sheet 30 inside the transparent film 34 comes into contact with the water W, and the pattern (dots) changes (is lost and colored).

  Therefore, also in this embodiment, the same operation and effect as the first embodiment can be obtained.

(Fourth embodiment)
Next, 4th Embodiment of this invention is described based on FIGS.
In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 17 and 18, in this embodiment, a mount 44 constituting a part of the detection sheet covering member is provided on the upper surface 32 </ b> A of the adhesive 32, and this mount 44 is the same size as the adhesive 32. The detection sheet 30 is fixed at the center of the upper surface 44A.

  The mount 44 is formed with a plurality of through holes 46 as liquid-soluble portions at predetermined intervals in the longitudinal direction. In addition, these through holes 46 connect the outside of the mount 44 and the inside of the transparent film 34 provided with the detection sheet 30. Each through hole 46 is closed with a water-soluble resin 38. The water-soluble resin 38 maintains a state of closing the through-hole 46 with moisture, but is dissolved when immersed in water so that the through-hole 46 penetrates.

  Therefore, when the mount 44 is immersed in water, the water-soluble resin 38 that closes the through hole 46 is dissolved. For this reason, as shown in FIG. 19 and FIG. 20, the water W enters the transparent film 34 from the outside of the mount 44 through the through hole 46. As a result, the detection sheet 30 inside the transparent film 34 comes into contact with the water W, and the pattern (dots) changes (is lost and colored).

  Therefore, also in this embodiment, the same operation and effect as the first embodiment can be obtained.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIGS.
In addition, about the same member as 2nd, 4 embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 21 and 22, in the present embodiment, a plurality of through holes 40 are formed in the upper wall portion 34 </ b> E of the transparent film 34 of the water leak detection seal 18, and a predetermined interval in the longitudinal direction is formed on the mount 44. A plurality of through holes 46 are formed. The through holes 40 and 46 connect the outside of the transparent film 34 and the inside of the transparent film 34 provided with the detection sheet 30.

  Each of the through holes 40 and 46 is closed with a water-soluble resin 38. The water-soluble resin 38 maintains a state of closing the through holes 40 and 46 with moisture, but dissolves when immersed in water W so that the through holes 40 and 46 penetrate.

  Therefore, when the transparent film 34 is immersed in water, the water-soluble resin 38 closing the through holes 40 and 46 is dissolved. For this reason, as shown in FIGS. 23 and 24, water W enters the inside of the transparent film 34 through the through holes 40 and 46 from the outside of the transparent film 34. As a result, the detection sheet 30 inside the transparent film 34 comes into contact with the water W, and the pattern (dots) changes (is lost and colored).

  Therefore, also in this embodiment, the same operation and effect as the first embodiment can be obtained.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described with reference to FIGS.
In addition, about the same member as 2nd Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 25 and 26, in this embodiment, a plurality of through holes 40 are formed in the upper wall portion 34 </ b> E of the transparent film 34 of the water leakage detection seal 18, and these through holes 40 are formed on the transparent film 34. The outside and the inside of the transparent film 34 provided with the detection sheet 30 are connected.

  Further, the outer peripheral portion of the transparent film 34 excluding the lower surface 34F bonded to the adhesive material 32 is covered with a water-soluble resin 38, and the water-soluble resin 38 closes the through hole 40. In addition, the water-soluble resin 38 does not dissolve in moisture and maintains the state of closing the through hole 40, but dissolves when immersed in water so that the through hole 40 penetrates.

  Therefore, when the transparent film 34 is immersed in water, the water-soluble resin 38 is dissolved. For this reason, as shown in FIGS. 27 and 28, water W enters the transparent film 34 from the outside of the transparent film 34 through the through holes 40. As a result, the detection sheet 30 inside the transparent film 34 comes into contact with the water W, and the pattern (dots) changes (is lost and colored).

  Therefore, also in this embodiment, the same operation and effect as the first embodiment can be obtained.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described with reference to FIGS.
In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 29 and 30, in the present embodiment, the outer peripheral portion of the detection sheet 30 of the water leakage detection seal 18 excluding the lower surface 30 </ b> A bonded to the adhesive material 32 is covered with a water-soluble resin 38. In addition, the water-soluble resin 38 does not dissolve in moisture and maintains a state of covering the detection sheet 30, but dissolves when exposed to water so that the detection sheet 30 is exposed.

  Accordingly, when the water leak detection seal 18 is immersed in water, the water-soluble resin 38 is dissolved. For this reason, as shown in FIGS. 31 and 32, the detection sheet 30 covered with the water-soluble resin 38 comes into contact with the water W, and the pattern (dots) changes (is lost and colored).

  Therefore, also in this embodiment, the same operation and effect as the first embodiment can be obtained.

(Eighth embodiment)
Next, an eighth embodiment of the present invention will be described with reference to FIGS.
In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 33 and 34, in the present embodiment, after the first pipe 12 and the second pipe 14 are joined, the water leakage detection seal 18 is attached to the first pipe 12, the second pipe 14, and the coupling portion 50. It is configured to be attached.

  As shown in FIGS. 35 and 36, the water leak detection seal 18 of the present embodiment is covered with a transparent film 34 on the outer peripheral portion of the detection sheet 30 except for the lower surface 30 </ b> A bonded to the adhesive material 32.

  As shown in FIGS. 36 and 37, the adhesive material 32 is formed with a plurality of through holes 52 as liquid-soluble portions, and these through holes 52 are provided outside the water leakage detection seal 18 and the detection sheet 30. Is connected to the inside of the water leakage detection seal 18 provided with.

  Each through hole 52 is closed with a water-soluble resin 38. This water-soluble resin 38 maintains the state of closing the through-hole 52 with moisture, but dissolves when immersed in water so that the through-hole 52 penetrates.

  Therefore, when water leaks from the first pipe 12, the second pipe 14, and the coupling portion 50, the water-soluble resin 38 that closes the through hole 52 is melted by the water. For this reason, as shown in FIGS. 34 and 38 to 40, water W enters the transparent film 34 from the lower surface side of the adhesive material 32 through the through hole 52. As a result, the detection sheet 30 inside the transparent film 34 comes into contact with the water W, and the pattern (dots) changes (is lost and colored).

  Therefore, also in this embodiment, the same operation and effect as the first embodiment can be obtained.

  In addition, the water leak detection seal | sticker 18 of this embodiment is applicable also to a different kind pipe | tube conversion coupling 60, as shown in FIG.41 and FIG.42.

(Other embodiments)
Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, although the water-soluble resin 38 is used in the above embodiment, when the liquid leaking from the first pipe 12 and the second pipe 14 is other than water, a liquid-soluble member that dissolves with this liquid is used.

10 Water leakage detection device (Liquid leakage detection device)
12 Piping 14 Piping 16 Pipe fitting 16D Fitting window (transparent part of pipe fitting)
18 Water leak detection seal (Liquid leak detection seal)
30 Detection sheet 32 Adhesive material (Detection sheet covering member)
34 Transparent film (detection sheet covering member)
36 Through-hole (Liquid-soluble part)
38 Water-soluble resin (detection sheet covering member, liquid-soluble part, liquid-soluble member)
40 Through-hole (liquid-soluble part)
46 Through-hole (liquid-soluble part)
44 Mount (detection sheet covering member)
46 Through-hole (liquid-soluble part)
52 Through-hole (Liquid-soluble part)

Claims (9)

A detection sheet that changes in color or pattern when touched by leaked liquid; and
A detection sheet covering member that covers the periphery of the detection sheet so that the change can be visually observed, and includes a liquid-soluble portion that is dissolved by the liquid, at least in part.
A liquid leak detection seal.   The detection sheet covering member includes a transparent film that covers the periphery of the detection sheet, and the liquid-soluble portion includes a through hole formed in the detection sheet covering member, a liquid soluble member that closes the through hole and is dissolved by the liquid. The liquid leakage detection seal according to claim 1.   The liquid leakage detection seal according to claim 1, wherein the detection sheet covering member includes a liquid-soluble member that covers the periphery of the detection sheet and is melted by the liquid.   The liquid leak detection seal according to claim 2, wherein the liquid soluble member is a water soluble resin. A detection sheet that changes in color or pattern when touched by the leaked liquid, a detection sheet that covers the periphery of the detection sheet so that the change is visible, and at least a part that is soluble in the liquid. A liquid leakage detection seal having a sheet covering member;
A pipe joint provided with the liquid leakage detection seal;
A liquid leakage detection device.   The detection sheet covering member includes a transparent film that covers the periphery of the detection sheet, and the liquid-soluble portion includes a through hole formed in the detection sheet covering member, a liquid soluble member that closes the through hole and is dissolved by the liquid. The liquid leak detection device according to claim 5, comprising:   The liquid leakage detection device according to claim 5, wherein the detection sheet covering member includes a liquid-soluble member that covers the periphery of the detection sheet and is melted by the liquid.   The liquid leak detection device according to any one of claims 5 to 7, wherein the pipe joint has a transparent portion where the liquid leak detection seal provided therein can be visually observed.   The liquid leak detection device according to claim 6, wherein the liquid soluble member is a water soluble resin.

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