JP2011038937A - Liquid supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid supply system preventing a liquid leakage or detecting a liquid leakage, at a connection part of a liquid channel having the connection part where the end of a first pipe is inserted into the end of a second pipe. <P>SOLUTION: This liquid supply system includes: liquid leakage prevention stoppers 10 mounted on each connection part between a pipe 31 of the liquid channel (circulation channel of cooling water) and a flexible tube 32, and comprising a member formed by allowing a water-absorbing swelling material to carry a water-soluble marker material and a hose clamp; and a monitoring unit 15 for monitoring occurrence of change of a property value caused by dissolution of the marker material in liquid flowing through the liquid channel, and outputting information showing occurrence of liquid leakage when detecting occurrence of the change of the property value. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The technology disclosed in the present specification relates to a liquid supply system including a liquid flow path.

With the recent high performance and miniaturization of computers, it has become difficult to cool CPUs (central processing units) and the like in computers with a cooling fan. Therefore, a water-cooled computer equipped with a unit for cooling the CPU and the like (hereinafter referred to as a water-cooled unit) has been developed. However, an existing water-cooled unit for a water-cooled computer has various components (pumps). Etc.) are connected by a flexible tube made of rubber (or resin).

  Specifically, for example, a water cooling unit 30 having the configuration shown in FIG. 15 exists as a water cooling unit for a water cooling computer.

  The water cooling unit 30 is a water cooling unit for a notebook PC (personal computer). The heat receivers 33 and 34 included in the water cooling unit 30 are parts (so-called water cooling jackets) that are arranged on a CPU or chip set in a notebook PC and in which a cooling water flow path is formed. The heat exchanger 35 is a part for dissipating the heat (heat absorbed by the cooling water from the CPU or the like) stored in the cooling water (such as “propylene glycol + water”) outside the notebook PC. The fan unit 36 is a unit for cooling the heat exchanger 35 by blowing air. The tank 37 is a part for storing cooling water, and the pump 38 is a device for pumping the cooling water.

  Each component (pump 38, heat receiver 33, etc.) through which the cooling water of the water cooling unit 30 passes is attached with a metal (or resin) pipe 31 that functions as an outlet for the cooling water from each component. Yes. Each component is also provided with a pipe 31 that functions as an inlet for cooling water to each component.

  Then, the water cooling unit 30 connects the pipes 31 of each component with a rubber (or resin) flexible tube 32 so that the cooling water circulates, and then the pipe of the flexible tube 32 by a hose clamp 39. The part into which 31 is inserted is tightened.

  In this way, the existing water-cooling unit for computers has various components connected by a flexible tube made of rubber / resin, but the flexible tube is relatively easy to deteriorate. is there. And since the tightening performance of the hose clamp also deteriorates over time, the existing water cooling unit is relatively susceptible to cooling water leakage from the connecting portion of the flexible tube.

  In addition, the existing water cooling unit / water cooling computer does not have a function of detecting that the cooling water has leaked from the connecting portion of the water cooling unit and notifying the user. Therefore, in the existing water-cooled computer, the user may not notice the cooling water leak from the cooling unit until a device such as a CPU is broken due to the cooling water leak.

JP-A-5-296379 JP-A-9-112777 JP 2004-363600 A JP 2006-336834 A JP-A-8-296789 JP-A-11-223285 JP 2006-78389 A

  The above-mentioned problems may occur in common in liquid flow paths having a connection portion in which the end portion of the first pipe is inserted into the end portion of the second pipe, although there are differences in degree.

  Therefore, the problem of the disclosed technique is a liquid supply system including a liquid flow path having a connection portion in which the end portion of the first pipe is inserted into the end portion of the second pipe, It is an object of the present invention to provide a liquid supply system that can prevent problems caused by liquid leakage.

  In order to solve the above problem, a liquid supply system according to an aspect of the disclosed technology connects a first pipe and a flexible second pipe by inserting an end of the first pipe into an end of the second pipe. A liquid channel having one or more connecting portions, and a marker substance carrying portion that covers the periphery of a portion around each end surface of the second pipe of each connecting portion of the liquid channel, the liquid channel A marker substance-supporting part formed by a composite material in which a marker substance soluble in a liquid flowing in the liquid is supported on a swelling material that absorbs the liquid and expands, and the marker material-supporting part does not spread outward A gripping part that grips the outer periphery of the substance-carrying part and a change in the physical property value caused by dissolution of the marker substance are monitored in the liquid flowing through the liquid channel to detect that the change in the physical property value has occurred. When, an information output unit for outputting information indicating that the liquid leakage occurs from any of the connection portion of the liquid channel comprises.

  If the said structure is employ | adopted, the liquid channel which has a connection part which inserted the edge part of the 1st pipe into the edge part of the 2nd pipe, and the problem resulting from the liquid leak from the connection part of the said liquid channel Therefore, it is possible to realize a liquid supply system that can prevent the occurrence of the above.

1 is a configuration diagram of a liquid supply system according to a first embodiment. Sectional drawing of the liquid leak prevention stopper with which the liquid supply system which concerns on 1st Embodiment is provided. Sectional drawing of the liquid leak prevention stopper which concerns on 1st Embodiment. The external view of the hose clamp currently used as a component of the liquid leak prevention stopper which concerns on 1st Embodiment. The external view of the other hose clamp which can be used for the liquid leak prevention stopper which concerns on 1st Embodiment. Explanatory drawing of the function of the liquid leak prevention stopper which concerns on 1st Embodiment. Explanatory drawing of the function of the liquid leak prevention stopper which concerns on 1st Embodiment. Sectional drawing of the liquid leak prevention stopper with which the liquid supply system which concerns on 2nd Embodiment is provided. Sectional drawing of the liquid-leakage prevention stopper which concerns on 2nd Embodiment. Sectional drawing of the liquid-leakage prevention stopper which concerns on 2nd Embodiment. Explanatory drawing of the function of the liquid leak prevention stopper which concerns on 2nd Embodiment. Explanatory drawing of the function of the liquid leak prevention stopper which concerns on 2nd Embodiment. Explanatory drawing of the connection part of the experimental flow path. Explanatory drawing of an experimental system. The block diagram of the existing cooling unit.

  Hereinafter, two types of liquid supply systems developed by the inventors (hereinafter referred to as liquid supply systems according to the first embodiment and the second embodiment) will be described in detail with reference to the drawings.

<< First Embodiment >>
FIG. 1 shows the configuration of the liquid supply system according to the first embodiment.

  As is clear from a comparison between FIG. 1 and FIG. 15, the liquid supply system according to the first embodiment adds a monitoring unit 15 to the water cooling unit 30 and prevents liquid leakage instead of each hose clamp 39. This is a system corresponding to the one provided with the stopper 10.

  First, the configuration and function of the monitoring unit 15 will be described. In the following description, the flexible tube 32 is abbreviated as the tube 32. In addition, a portion composed of a portion where the pipe 31 and the tube (flexible tube) 32 overlap and a portion of the pipe 31 near the end face of the tube 32 that is not covered with the tube 32 is referred to as a connection portion. To do.

  The monitoring unit 15 is a unit that detects a liquid leak (cooling water leak) from the connecting portion and notifies the user of it. The monitoring unit 15 includes a sensor 15a and a notification unit 15b.

  The sensor 15a measures a physical property value that changes when the marker substance dissolves in the cooling water circulating in the liquid supply system (in the cooling water flow path constituted by the pipe 31, the tube 32, etc. in the liquid supply system). It is a sensor for. The marker substance is a water-soluble substance prepared in the liquid leakage prevention stopper 10 for the purpose of dissolving in the cooling water flowing in the liquid supply system when the cooling water leaks from the connecting portion. Details are described later.

  Various sensors 15a can be used. For example, as the sensor 15a, a sensor for measuring the electrical conductivity (conductivity) of cooling water or a sensor for measuring the absorbance at the absorption wavelength specific to the marker substance (LED for light source, photosensor with filter, etc.) Can be adopted. When a fluorescent substance is used as the marker substance, a sensor (such as an ultraviolet LED as an excitation light source and a photosensor with a filter) for measuring the fluorescence intensity specific to the marker substance can be employed as the sensor 15a. .

  The notification unit 15b periodically monitors a predetermined change in the monitored physical property value (physical property value measured by the sensor 15) based on the output of the sensor 15a, and the predetermined change occurs in the monitored physical property value. This unit notifies the user that a liquid leak (cooling water leak) has occurred. Note that “predetermined change in the physical property value to be monitored” means that the value of the physical property value to be monitored is a certain value that the marker substance has dissolved (because of the measurement error or the temperature change of the cooling water, etc. It changes more than a preset value as an (unusable value) ”.

Various notification units 15b can be employed. For example, as the notification unit 15b, when a predetermined change occurs in the physical property value to be monitored, a unit that displays a message indicating that a liquid leak has occurred on the display of the notebook PC (notebook P
A unit using a CPU in C) can be employed. Further, the notification unit 15b indicates that the user has detected that the liquid has leaked by a method other than displaying a message on the display (for example, lighting / flashing of a specific LED, generation of a specific warning sound, output of a voice message). It is also possible to adopt a unit that notifies the user.

  As the notification unit 15b, a unit (unit that constantly monitors the output of the sensor 15a) having an extremely short monitoring period of the output of the sensor 15a (determination period of whether or not a predetermined change has occurred in the monitored physical property value) may be employed. A unit having a relatively long monitoring period (for example, 1 hour) of the output of the sensor 15a may be employed.

  In addition, a unit that can detect the occurrence of liquid leakage only once can be adopted as the notification unit 15b. However, as the notification unit 15b, it is desirable to employ a unit that notifies the user that liquid leakage has occurred each time a predetermined change occurs in the monitored physical property value. For convenience of explanation, the reason why it is desirable to employ the notification unit 15b having such a function will be described later.

Next, the configuration of the liquid leakage prevention stopper 10 will be described.
FIG. 2 shows a cross-sectional view of the liquid leakage prevention stopper 10 through a plane passing through the centers of the pipe 31 and the tube 32, and FIG. 3 shows a cross section of the liquid leakage prevention stopper 10 along the line AA in FIG. The figure is shown.

  As shown in FIGS. 2 and 3, the liquid leakage prevention stopper 10 is an inflatable portion having a shape that covers the periphery of a portion of the connecting portion centered on the end surface of the tube 32 (hereinafter referred to as a connecting end portion). 11 and a hose clamp 12 for fixing (pressing) the expanding portion 11 to the connecting portion by tightening the outer periphery of the expanding portion 11.

  The inflatable portion 11 is not a bulk-like member, but is formed by winding a “sheet-like composite member in which a water-soluble marker substance is supported on a sheet-like member that expands when water is absorbed” around the connection end. It is a member (part).

  As is apparent from the formation procedure of the expansion portion 11 and the configuration of the connection portion, the liquid leakage prevention stopper 10 is attached by the following procedure.

  When the liquid leakage prevention stopper 10 is attached, the hose clamp 12 is passed through the pipe 31 before connecting the tube 32 (or the tube 32 before connecting to the pipe 31).

  Thereafter, the operation of connecting the tube 32 to the pipe 31 (operation of inserting the end of the pipe 31 into the end of the tube 32 / operation of covering the end of the tube 32 outside the end of the pipe 31) and the periphery of the connection end An operation of winding the sheet-like composite member around is performed. The latter operation is performed so that the outer diameter of the wound sheet-like composite member is larger than the inner diameter of the hose clamp 12 when the knob portion 12a is not operated.

  Next, an operation of tightening the sheet-like composite member wound around the connection end portion with the hose clamp 12 that has been passed through the pipe 31 (or the tube 32) is performed. That is, after the hose clamp 12 whose diameter has been enlarged by operating the two knob portions 12a with a finger is moved to the portion around which the sheet-like composite member is wound, an operation of releasing the finger from the knob portion 12a is performed. And the attachment to the connection part of the liquid leak prevention stopper 10 is completed.

Note that the liquid leakage prevention stopper 10 according to the present embodiment uses the hose clamp 12 having the shape shown in FIG. 4, but instead of the hose clamp 12, the hose clamp 13 having the shape shown in FIG. It is also possible to use a hose clamp whose diameter can be increased or decreased by operating the screw 13a. Instead of the hose clamp 12, it is also possible to use a part whose diameter cannot be enlarged or reduced, but which can fix the position of the outer peripheral surface of the expanding portion 11 (so that the expanding portion 11 does not spread outward). However, it is preferable to employ a hose clamp that can expand and contract the diameter as a part for gripping the outer periphery of the inflating portion 11 because the work that can be expanded / reduced is easier.

  Before detailed description of the sheet-like composite member (sheet-like member, marker substance), the function of the liquid leakage prevention stopper 10 and the liquid supply system (monitoring unit 15) will be described with reference to FIGS. The function will be explained.

  As already described, the main component of the expansion portion 11 of the liquid leakage prevention stopper 10 is a sheet-like member that expands when water is absorbed. Therefore, when cooling water leaks out from a certain connecting portion (connection end portion, gap between the outer surface of the pipe 31 and the inner surface of the tube 32) due to aging degradation of the tube 32, as schematically shown in FIG. Leaked cooling water does not leak out of the inflatable portion 11 and is in a portion of the inflatable portion 11 located in the vicinity of the end face of the tube 32 (a white portion where a plurality of arrows are shown in FIG. 6). Will be absorbed.

  And although the said part tends to expand | swell, the outer periphery of the expansion | swelling part 11 is being fixed by the hose clamp 12. FIG. Therefore, as schematically shown in FIG. 7, the expansion force generated by the absorption of the cooling water is a force that reduces the diameter of the tube 32 and a force that compresses each part of the expansion part 11 (the expansion part 11 is more It will work as a force that makes it difficult for liquids to pass through. As a result, cooling water leakage from the connecting portion into the expanding portion 11 is stopped.

  In addition, a water-soluble marker substance is present in the inflatable portion 11 (sheet-like composite member). Therefore, when cooling water leaks from the connecting part into the expansion part 11, the marker substance in the expansion part 11 is dissolved in the cooling water circulating in the liquid supply system. A monitoring unit 15 (FIG. 1) is provided to notify the user that a liquid leak (cooling water leak) has occurred when a predetermined change in the physical property value to be monitored occurs.

  Therefore, the user of the notebook PC can immediately grasp that the cooling water leak has occurred (when the notification unit 15b actually determines the presence or absence of the liquid leak after the occurrence of the cooling water leak).

  Moreover, the leakage of the cooling water from the connecting portion is already stopped by the above function of the liquid leakage prevention stopper 10. And even if cooling water leaks from the same connection part / different connection part after that, the cooling water leak by the said function of the liquid leak prevention stopper 10 is stopped in principle.

  Accordingly, the user can leave the liquid supply system (notebook type PC) for repair before a practical problem occurs (a device such as a CPU is broken due to leakage of cooling water).

  Now, if the liquid supply system according to the first embodiment is used, as described above, it is possible to stop the liquid leakage generated at each connection portion. However, when a unit that can detect the occurrence of liquid leakage only once (for example, a unit that only determines whether or not the electrical conductivity is equal to or higher than a predetermined value) is used as the notification unit 15b, liquid leakage occurs. Even if a liquid leak occurs again before repairing, the user cannot be notified of the occurrence of the liquid leak again (in other words, the repair needs to be rushed).

  Therefore, it is desirable to employ a unit that notifies the user that a liquid leak (cooling water leak or the like) has occurred every time a predetermined change occurs in the monitored property value as the notification unit 15b. In addition, as such a notification unit 15b, for example, a unit that notifies the user that liquid leakage has occurred when the difference between the reference value and the physical property value to be monitored is equal to or greater than a predetermined value. After the notification, it is possible to employ a unit that monitors whether the monitored physical property value is stabilized and resets the monitored physical property value after stabilization as a reference value.

  Next, members that can be employed as the sheet-like composite member will be described.

  As the sheet-like composite member, various members can be adopted as long as they are “a member in which a water-soluble marker substance is supported on a sheet-like member that expands when water is absorbed”.

  For example, as a sheet-like member of a sheet-like composite member, a woven or non-woven fabric formed from fibers of a swellable resin such as a polyacrylic acid resin, a poval resin, a polyoxyethylene resin, or a cellulose resin, a swellability A woven or non-woven fabric formed from resin fibers and chemical fibers such as polyester, or a woven or non-woven fabric made of chemical fibers impregnated with a swellable resin can be employed.

However, if a resin having an ionic group is used as a constituent material of the sheet-like member, a sheet-like member capable of easily carrying a large amount of marker substance can be obtained. Accordingly, it is preferable to use a resin having the following configuration (that is, a resin having an ionic group such as a carboxyl group) for the sheet-like member.
-(Meth) acrylic acid [acrylic acid or methacrylic acid: hereinafter the same. ]
・ Metal salts of (meth) acrylic acid ・ Amino-substituted (meth) acrylamides such as dimethylaminopropyl (meth) acrylamide ・ Amino-substituted alkyls such as dimethylaminoethyl (meth) acrylate and diethylaminoethyl (meth) acrylate ester

  The polyacrylic acid-based resin is originally a resin having an ionic group and is a resin that does not lose its properties as a fiber even if it is made into a fiber and absorbs water. Therefore, as the sheet-like member, it is desirable to adopt a material in which a polyacrylic resin is used as a constituent material.

  Further, the marker substance to be carried on the sheet-like member only needs to be a water-soluble substance. However, as the monitoring unit 15, one that measures electrical conductivity can be realized at the lowest cost. The amount of change in electrical conductivity with respect to the amount dissolved in the cooling water (number of moles) is basically (although the mobility of ions etc. is also related), but the substance having many ionic groups that are likely to dissociate is better. large.

  Therefore, as the marker substance, it is preferable to employ a substance having a large number of ionic groups, for example, a substance having two or more sulfonic acid groups as shown below. A sulfonic acid group (sodium sulfonate group) It is desirable to employ pyranin-4 (or -3) having a particularly large number.

Pyranine-3 (8-hydroxypyrene-1,3,6-trisulfonic acid trisodium salt)
Pyranine-4 (tetrasodium pyrene-1,3,6,8-tetrasulfonate)
R acid (2-naphthol-3,6-disulfonic acid)
Chromotropic acid
4,4'-Diaminostilbene-2,2'-disulfonic acid

Note that the liquid supply system according to the first embodiment (inside the water cooling unit portion) is one in which the electrical conductivity of the cooling water does not change unless the marker substance is dissolved. There are also those where the electrical conductivity of the flowing liquid can / can change due to other causes. And when the presence or absence of a liquid leak is determined by the electrical conductivity change of the liquid which flows through such a liquid flow path, a misjudgment may be performed. However, the above-mentioned pyranine and the like are substances whose electric conductivity of cooling water changes due to dissolution in cooling water, and have a maximum fluorescence wavelength in the range of 430 to 510 nm [pyranin = 507 nm, R acid = 461 nm, chromotropic acid. = 430 nm, 4,4′-diaminostilbene-2,2′-disulfonic acid = 450 nm]. Therefore, if pyranine or the like is employed as a marker substance and a monitoring unit 15 having a sensor 15a for measuring the fluorescence intensity is employed, the electrical conductivity of the liquid may change due to other causes. A liquid supply system that can accurately detect the presence or absence of liquid leakage from the connecting portion can be realized.

<< Second Embodiment >>
Hereinafter, the configuration and function of the liquid supply system according to the second embodiment will be described with a focus on differences from the liquid supply system according to the first embodiment.

  The liquid supply system according to the second embodiment is a system that employs a liquid leakage prevention stopper 20 having the configuration shown in FIGS. 8 to 10 instead of the liquid leakage prevention stopper 10. 8 is a cross-sectional view of the liquid leakage prevention stopper 20 on a plane passing through the center of the pipe 31, and FIGS. 9 and 10 respectively show the liquid leakage prevention stopper 20 along the line BB in FIG. FIG. 6 is a cross-sectional view taken along the line CC.

  As shown in FIGS. 8 to 10, the liquid leakage prevention stopper 20 includes an inflating portion 21 and a hose clamp 22 for fixing the inflating portion 21 to the connecting portion by tightening the outer periphery of the inflating portion 21. It has.

  As with the hose clamp 12, the hose clamp 22 employed in the liquid leakage prevention stopper 20 is a hose clamp that can increase the inner diameter by narrowing the interval between the two knob portions 22 a. However, the hose clamp 22 is not manufactured by processing a leaf spring having the same thickness as each hose clamp 12 (see FIG. 4), but manufactured by processing a leaf spring having a tapered cross-sectional shape. It has been made.

  In short, the hose clamp 22 is a hose clamp manufactured to have a frustoconical inner surface shape.

  The inflatable portion 21 is a pipe 31 for processing a bulk member formed of a swellable resin fiber or the like into a truncated cone shape that is slightly larger than the inner surface shape of the hose clamp 22 and passing the pipe 31 and the tube 32 therethrough. A member that carries a marker substance after opening a hole whose inner diameter changes according to the outer diameter of the tube 32 (hereinafter referred to as a pipe hole).

  As the inflating portion 21, it is possible to employ a material that is essentially the same as the sheet-like composite member according to the first embodiment (a material that differs only in shape).

  Although it is considered to be clear from the shapes of the inflating portion 21 and the hose clamp 22 described above, the procedure for attaching the liquid leakage prevention stopper 20 will be described here.

When the liquid leakage prevention stopper 20 is attached, first, the hose clamp 22 and the expansion part 21 are passed through the pipe 31 before the tube 32 is connected. The hose clamp 22 is passed through the pipe 31 in such a posture that the surface having the larger inner diameter (the right surface in FIG. 8) faces the open end side (the right side in FIG. 8) of the pipe 31. Further, after the hose clamp 22 is passed through the pipe 31, the inflating portion 21 is passed through the pipe 31 in such a posture that the surface having the larger outer diameter faces the open end side of the pipe 31.

  Next, an operation of connecting the tube 32 to the pipe 31 passing through the expansion portion 21 and the like and an operation of moving the expansion portion 21 to the connection end portion are performed. Thereafter, the work of tightening the expansion portion 21 with the hose clamp 22 is performed, whereby the attachment of the liquid leakage prevention stopper 20 to the connection portion is completed.

  Hereinafter, the function of the liquid leakage prevention stopper 20 will be described with reference to FIGS. 11 and 12.

  As described above, the expansion portion 21 of the liquid leakage prevention stopper 20 is obtained by processing a bulk-like member formed from a swellable resin fiber or the like into a truncated cone shape that is slightly larger than the inner shape of the hose clamp 22. The pipe hole is opened with.

  That is, the inflating part 21 is functionally the same as the inflating part 11. Therefore, when the cooling water leaks from the connection portion due to aging degradation or the like of the tube 32, the leaked cooling water does not leak outside the expansion portion 21 as schematically shown in FIG. Is absorbed by the central portion (the portion of the inflating portion 21 located near the end face of the tube 32).

  Then, although the portion tends to expand, the outer periphery of the expanding portion 21 is fixed by a hose clamp 22 having a frustoconical inner surface and a surface having a larger inner diameter facing the tube 32 side. Therefore, when the expansion part 21 absorbs the cooling water, a force in a direction indicated by an arrow in FIG. 12 (a direction perpendicular to the inner surface of the hose clamp 22) is generated.

  This diagonal force includes a force for reducing the diameter of the tube 32, a force for compressing each part of the inflating part 21 (a force for making the inflating part 21 more difficult for liquid to pass through), and a pipe through which cooling water actually leaks. It functions as a force that strongly compresses the gap between the tube 31 and the tube 32 (strongly presses the expanding portion 21 into the gap or causes a part of the expanding portion 21 to enter).

  Accordingly, the liquid leakage prevention stopper 20 has a function of strongly compressing the gap between the pipe 31 and the tube 32, so that the liquid leakage prevention stopper 20 has a higher performance of stopping the liquid leakage than the liquid leakage prevention stopper 10.

  Finally, the contents and results of an experiment conducted for confirming the liquid leakage prevention / detection performance of the liquid supply system according to the second embodiment will be described.

  In order to confirm the liquid leakage prevention / detection performance of the liquid supply system according to the second embodiment, the inventors have a liquid flow path in which water is circulated by a pump having a connection portion configured as shown in FIG. Hereinafter, it is referred to as an experimental flow path).

In this connecting portion (FIG. 13), the wire 40 is sandwiched between the pipe 31 and the tube 32 in order to cause liquid leakage in a short time. In addition, each member used for the structure of the experimental flow path (connection part) has the following specifications.
Pipe 31: Aluminum tube having an outer diameter of 5 mm and an inner diameter of 3 mm Tube 32: Butyl rubber tube having an outer diameter of 6 mm and an inner diameter of 4 mm Wire 40: Metal wire having a diameter of 0.5 mm

  Then, the inventors continuously flow water for 500 hours through a connection portion of the experimental flow channel with the liquid leakage prevention stopper 20 as shown in FIG. 14 (hereinafter referred to as an experimental system). The experiment was conducted. The inventors also conducted an experiment in which water was allowed to flow continuously through a portion near the connection end of the experimental flow path that was tightened with a hose clamp (hereinafter referred to as a comparative system). In all cases, the flow rate of water is 400 ml / min.

  As a result, in the comparison system, a visible amount of water leaked from the connection portion in a short time (less than 1 hour). However, in the experimental system, water leakage from the connection portion even after 500 hours passed. It could not be confirmed. However, the electrical conductivity of water after 500 hours has changed from the initial value of 1 μS / cm to 50 μS / cm, and the liquid leakage prevention stopper 20 can prevent liquid leakage to the outside, and the electrical conductivity. By measuring the degree, it was confirmed that water leakage from the connection portion could be detected.

<Deformation>
The liquid supply system according to each of the above embodiments can be variously modified. For example, the liquid supply system according to each embodiment can be modified into a liquid supply system including a liquid flow path through which a liquid other than cooling water flows. Moreover, the expansion part 11 of the liquid leakage prevention stopper 10 can be set as a bulk-like member, or the expansion part 21 of the liquid leakage prevention stopper 20 can be formed by winding a sheet-like member around the connection end. I can do it.

  As described above, the following additional notes are disclosed with respect to the disclosed technology.

(Supplementary Note 1) A liquid flow path having one or more connecting portions that connect the first pipe and the flexible second pipe by inserting the end portion of the first pipe into the end portion of the second pipe;
A marker substance carrying part that covers a periphery of a portion of each connection part of the liquid channel centering on an end surface of the second pipe, and absorbs the liquid with a marker substance that is soluble in the liquid flowing in the liquid channel A marker substance carrying portion formed by a composite material carried on a swelling material that expands
A gripping part for gripping the outer periphery of the marker substance carrying part so that the marker substance carrying part does not spread outward;
When the change in the physical property value caused by the dissolution of the marker substance is observed in the liquid flowing through the liquid channel, and the occurrence of the change in the physical property value is detected, any one of the liquid channel An information output unit that outputs information indicating that liquid leakage has occurred from the connection unit.

(Supplementary Note 2) The gripping portion is
Supplementary note 1 characterized in that it is a member that is arranged with respect to the marker substance carrying part so that the end face with the larger inner diameter having the inner peripheral surface of the side surface of the truncated cone is located on the second pipe. The liquid supply system as described.

(Supplementary note 3) The liquid supply system according to any one of Supplementary notes 1 or 2, wherein the swelling material is a material mainly composed of a polyacrylic acid resin.

(Supplementary note 4) The liquid supply system according to any one of Supplementary notes 1 to 3, wherein the marker substance is a substance mainly composed of a molecule having two or more sulfonic acid groups.

(Additional remark 5) The said marker substance is a substance which has pyranin-3 or pyranin-4 as a main component. The liquid supply system of Additional remark 4 characterized by the above-mentioned.

(Additional remark 6) The said marker substance carrying | support part is formed by winding the said sheet-like composite material around the part centering on the end surface of the said 2nd pipe of each connection part of the said liquid flow path. The liquid supply system according to any one of appendices 1 to 5, characterized in that:

(Appendix 7) When the marker substance carrying portion is provided with holes through which the first pipe and the second pipe pass in a direction perpendicular to the bottom surface, each portion is compressed when held by the holding portion. The liquid supply system according to claim 2, wherein the liquid supply system is a truncated cone-shaped member.

(Supplementary note 8) The liquid supply system according to any one of claims 1 to 7, wherein the gripping part is a hose clamp capable of tightening an outer periphery of the marker substance carrying part.

(Supplementary note 9) The liquid supply system according to any one of supplementary notes 1 to 8, wherein the change in the physical property value monitored by the information output unit is a change in electrical conductivity of the liquid.

(Supplementary note 10) The liquid supply system according to any one of supplementary notes 1 to 8, wherein the change in the physical property value monitored by the information output unit is a change in the optical physical property value of the liquid.

(Supplementary note 11) The liquid supply system according to any one of supplementary notes 1 to 10, wherein the liquid channel is a channel for flowing cooling water provided in a computer.

10, 20 Liquid leak prevention stopper 11, 21 Expanding part 12, 13, 22, 39 Hose clamp 12a, 22a Knob part 15 Monitoring unit 15a Sensor 15b Notification unit 30 Water cooling unit 31 Pipe 32 Flexible tube (tube)
33, 34 Heat receiver 35 Heat exchanger 36 Fan unit 37 Tank 38 Pump 40 Wire

Claims (6)

A liquid flow path having one or more connecting portions connecting the first pipe and the flexible second pipe by inserting an end portion of the first pipe into an end portion of the second pipe;
A marker substance carrying part that covers a periphery of a portion of each connection part of the liquid channel centering on an end surface of the second pipe, and absorbs the liquid with a marker substance that is soluble in the liquid flowing in the liquid channel A marker substance carrying portion formed by a composite material carried on a swelling material that expands
A gripping part for gripping the outer periphery of the marker substance carrying part so that the marker substance carrying part does not spread outward;
When the change in the physical property value caused by the dissolution of the marker substance is observed in the liquid flowing through the liquid channel, and the occurrence of the change in the physical property value is detected, any of the liquid channel An information output unit that outputs information indicating that liquid leakage has occurred from the connection unit. The gripping part is
The member arranged on the marker substance carrying portion so that the end surface having the larger inner diameter and having the inner peripheral surface of the side surface of the truncated cone is positioned on the second pipe. The liquid supply system according to claim 1. The liquid supply system according to claim 1, wherein the swelling material is a material mainly composed of a polyacrylic acid resin. The liquid supply system according to any one of claims 1 to 3, wherein the marker substance is a substance whose main component is a molecule having two or more sulfonic acid groups. The liquid supply system according to claim 4, wherein the marker substance is a substance mainly composed of pyranin-3 or pyranin-4. The marker substance carrying part is
The sheet-like composite material is wound around a portion around each end of the second pipe of each connection portion of the liquid flow path. A liquid supply system according to claim 1.

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