JP2010216627A - Hose connection pipe coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely and quickly detect leakage water of a hose connecting pipe coupling. <P>SOLUTION: This hose connecting pipe coupling includes a pipe coupling tip part 11 of a circular pipe shape inserted into a hose tube hole 2a from the rear end of a hose 2, a sleeve 20 arranged so as to cover the outer periphery of a rear end part of the hose 2 in a concentric circle shape and sandwiching the hose 2 between the tip part 11 and itself, and a heating layer 3 for covering the outer periphery of the sleeve 20 and the hose 2 over the hose 2 from the sleeve 20 and reacting with cooling water by heating. Since the heating layer 3 is heated when the cooling water leaks from between the hose 2 and the pipe coupling, the leakage water can be sharply detected by a temperature sensor. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hose connection pipe joint in which a flexible hose for flowing cooling water and a pipe joint are connected to each other.

  Since the water-cooled cooling system has a high cooling effect, it is widely used for cooling a heat generating device that generates heat such as an electronic device or a mechanical device. In such a cooling system, a cooling system cooled by the cooler is sent into the heat generating device, and a circulating system is configured to recirculate the warmed cooling water after heat exchange in the heat generating device to the cooler. The cooler and the heat generating device are usually connected using a flexible hose, for example, a rubber or resin hose. That is, a pipe joint made of a rigid material at both ends of a flexible hose, for example, a hose connection pipe joint in which a metal pipe joint is connected, is attached to the wall (front panel) of the housing of the apparatus using a fitting fitting of the pipe joint. The other end is connected to the water intake port or water supply port of the cooler to constitute a cooling water circulation path.

  However, flexible hoses tend to deteriorate due to aging, and during long-term use, the elasticity of the hose is lost, creating gaps in the joints with pipe joints, or cracking of the hose. Water leakage may occur from the connection between the hose and the pipe joint. Such water leakage in electrical equipment or mechanical equipment significantly impairs the reliability of the equipment. For this reason, it is important to detect the water leak in the joint part of a hose and a joint early and reliably and to take an appropriate measure.

  Conventionally, as a method for detecting the leakage of coolant from the connection between the hose and the pipe joint, a sensor for detecting the leakage of the coolant has been disposed near the connection between the hose and the pipe joint of the hose connection pipe joint. Things are known.

  For example, a sensor with a comb-shaped wiring pattern formed on the chip main surface is placed near the connection between the hose and pipe joint, and changes in resistance between the wirings caused by contact with the leaked coolant are detected. (For example, refer to Patent Document 1).

  In addition, a moisture absorbing material and a humidity sensor are arranged in a portion where water leakage is expected, and the moisture sensor detects water leakage, and at the same time, the leakage of water is absorbed by the moisture absorbing material to prevent the leakage of water into the apparatus. (For example, refer to Patent Document 2).

  Furthermore, there exists a hose connection pipe joint which arrange | positioned the IC tag which stops transmission when it contacts the leaked coolant at the connection part of a hose and a pipe joint (for example, refer patent document 3).

JP 2003-209210 A JP 2000-164390 A JP 2007-218839 A

  However, in the conventional hose connection pipe joint in which the sensor for detecting water leakage described above is arranged at the connection portion between the hose and the pipe joint, at least one sensor is arranged in one hose connection pipe joint. For this reason, in order to detect a water leak reliably, all the sensors must always operate | move reliably, and very high reliability is calculated | required with respect to a sensor and its receiving circuit. For this reason, there exists a problem that the installation cost and operation cost of a cooling system are high.

  In addition, a signal line of the sensor has to be wired to each hose connection pipe joint, and there is a problem of deterioration in reliability due to the large number of wirings. In particular, in order to improve the reliability of water leakage detection, a plurality of sensors may be arranged in one hose connection fitting. However, in this place, the number of wires increases by the increase in the number of sensors, and the reliability of the wiring laying is impaired as the cost increases.

  In a conventional hose connection pipe joint that uses an IC tact as a sensor, problems related to wiring reliability can be avoided. However, at least one sensor must be arranged in one hose connection pipe joint, and it cannot be avoided that the cost of the sensor and the receiving circuit increases.

  An object of the present invention is to provide a hose connection pipe joint that can reliably detect water leakage between the hose and the joint and can be operated at low cost.

  The hose connection pipe joint of the first configuration of the present invention for solving the above-mentioned problem is a hose connection pipe joint in which a water hose is connected to the pipe joint, and is formed at the tip of the pipe joint. A tip portion inserted into the tube hole, a sleeve provided so as to cover an outer periphery of the hose into which the tip portion is inserted, and sandwiching the hose between the tip portion, and the sleeve and the hose And an exothermic layer that covers the outer periphery and extends from the sleeve to the hose and reacts exothermically with the water.

  In the hose connection pipe joint of the present invention, a heat generation layer including a heat generation material that generates heat upon contact with water leakage is provided on the outer periphery of the connection portion between the flexible hose and the rigid joint. For this reason, water leakage can be reliably detected by the non-contact temperature sensor as heat generation in the heat generation layer. Furthermore, since the temperature of the plurality of connecting portions can be monitored by one temperature sensor, the manufacturing cost of the cooling system is low and the operation cost is suppressed low.

Hose connection pipe joint side sectional view of a first embodiment of the present invention Hose connection pipe joint front sectional view of the first embodiment of the present invention Electronic device front view of a first embodiment of the present invention Electronic device side view of the first embodiment of the present invention Hose connection pipe joint side sectional view of the second embodiment of the present invention Hose connection pipe joint front sectional view of the second embodiment of the present invention Hose connection pipe joint side sectional view of a third embodiment of the present invention Hose connection pipe joint side sectional view of the fourth embodiment of the present invention

  1st Embodiment of this invention is related with the hose assembly using the hose connection pipe joint which provided the heat-generating layer and the heat contraction tube in the outer periphery of the connection part of a flexible hose and a pipe joint.

  FIG. 1 is a side cross-sectional view of a hose connection pipe joint according to a first embodiment of the present invention, and shows a cross-sectional structure along a pipe axis of a hose assembly formed by connecting a pipe joint to a hose end. FIG. 2 is a front cross-sectional view of the hose connection pipe joint according to the first embodiment of the present invention, and shows a cross section perpendicular to the pipe axis (AA ′ cross section in FIG. 1).

  Referring to FIG. 1, a hose connection fitting 100 according to a first embodiment of the present invention has a flexible hose 2 constituting a cooling water flow path, a front end connected to the hose 2, and a rear end cooled. A pipe joint 40 that is fixed to a device to be used, for example, an electronic device and forms a flow channel 19 that connects the flow channel of the hose 2 and the cooling water flow channel in the electronic device is provided.

  The pipe joint 40 is made of a highly rigid material, for example, a metal such as stainless steel, and includes a tubular joint body 10 and a tubular sleeve 20 provided concentrically on the outer periphery of the distal end of the joint body 10. In this specification, the direction in which the hose extends from the pipe joint 40 (the left direction in FIG. 1) is the front end direction or the front direction, and the direction of the electronic device housing to which the pipe joint 40 is attached as viewed from the hose (FIG. 1). The right direction) is the rear end direction or the rear direction.

  The joint main body 10 has a circular pipe shape, and forms a cooling water flow path 19 in which a hollow portion of the circular pipe penetrates the joint main body 10 back and forth. The joint body 10 is composed of three parts, a front end part, a central part 12 and a rear end part 13 in order from the side to which the hose 8 is connected.

  The central portion 12 of the joint body 10 is formed thicker than the front end portion 11 and the rear end portion 13, a male screw 15 is formed on the outer periphery of the front end portion of the central portion 12, and a male screw 16 is formed on the outer periphery of the rear end portion of the central portion 12. Is formed.

  The distal end portion 11 of the joint body 10 is formed of a circular pipe having an outer diameter smaller than that of the central portion 12, and the outer diameter is formed so as to be fitted to the inner diameter of the hose 2 (the diameter of the tube hole 2a of the hose 2). And this front-end | tip part 11 is inserted from the front end side of the front-end | tip part 11 to the tube hole 2a opened to the hose 2 rear end. As a result, the hose 2 is attached to the joint body 10 with the inner surface of the tube at the rear end of the hose 2 in close contact with the outer periphery of the distal end portion 11.

  The rear end portion 12 of the joint body 10 is for connecting the hose 2 and a cooling water pipe (for example, a pipe in an electronic device) in the heat generating device housing, together with a male screw 16 formed at the rear end of the central portion 12. The joint body 10 is fixed to a device (for example, an electronic device), and the joint body 10 is connected to the cooling water pipe.

  The sleeve 20 constitutes a pipe joint 40 together with the joint body 10. A rear end portion of the sleeve 20 constitutes a fixing portion 13, and a female screw 23 is formed on the inner diameter surface of the rear end of the fixing portion 13. The female screw 23 is screwed into the male screw 15 formed at the tip portion of the central portion 12. The sleeve 20 is fixed to the joint body 10 by the female screw 23.

  The caulking portion 21 constituting the front end portion of the sleeve 20 is formed from a thin circular tube provided concentrically with the front end portion 11 so as to cover the rear end portion of the hose 2 into which the front end portion 11 of the joint body 10 is fitted. Become. The caulking portion 21 is reduced in diameter by caulking, and as a result, the hose 2 inserted into the distal end portion 11 is sandwiched and fixed between the distal end portion 11 and the caulking portion 21.

  The structure described above of the hose connection pipe joint 40 is the same as the structure of the conventional hose connection pipe joint. In the hose connection pipe joint 100 of the first embodiment, the heat generating layer 3 and the heat shrinkable tube 5 are further provided on the outer periphery of the above-described hose connection pipe joint.

  Normally, leakage of cooling water often occurs when the hose 2 in the caulked portion 21 is loosened or cracked in the caulked portion of the hose 2 due to deterioration of elasticity of the hose 2. In this case, the cooling water in the tube hole 2 a of the hose 2 passes through the crack or looseness of the hose 2 immediately below the caulking portion 21 and leaks from the tip of the caulking portion 21 to the outer periphery of the hose 2. Therefore, water leakage often occurs between the tip of the caulking portion 21 and the outer periphery of the hose 2.

  The heat generating layer 3 is made of a material containing a substance that reacts exothermically with cooling water, and is provided so as to cover the outer periphery of the hose 2 and the caulking portion 21. The heat generating layer 3 is provided at a predicted water leakage position, covers at least the tip of the caulking portion 21 (the hose 2 is exposed in front of it), and extends forward and backward, that is, the caulking portion. It is preferable to provide the outer periphery of the hose 2 so as to cover the outer periphery of the hose 2 extending forward from the tip of the gripping portion 21.

  In addition, the metal ring 6 inserted in the outer periphery of the hose 2 was provided in contact with the tip of the heat generating layer 3. The metal ring 8 is provided to prevent leakage of water that spreads forward from the end of the caulking portion 21 along the outer periphery of the hose 2 beyond the end of the heat generating layer 3.

  For example, quick lime is used as the exothermic reactant contained in the exothermic layer 3. The heat generating layer of the first embodiment was formed by supporting quick lime powder on a nonwoven fabric and winding the nonwoven fabric around the hose 2 and the caulking portion 21. As will be described later, the detection sensitivity of water leakage increases as the temperature of the heat generating layer 3 that reacts with water leakage increases. For this reason, it is preferable to mix aluminum powder with quicklime to increase the heat of reaction so as to obtain a higher temperature exothermic reaction.

  In the first embodiment, the heat shrinkable tube 5 is further provided on the outer periphery of the heat generating layer 3. The heat-shrinkable tube 5 is provided on the outer periphery of the heat generating layer 3, and when the heat generating layer 3 reacts with water leakage and becomes high temperature, the heat-shrinkable tube 5 heat-shrinks and fastens the caulking portion 11 from the outer periphery. As a result, water leakage from the portion caulked by the caulking portion 11 of the hose 2 is suppressed, so that destruction of the electronic device due to a large amount of water leakage is avoided.

  The heat shrinkable tube 5 is desirably disposed at a position where water leakage can be effectively suppressed by heat shrinkage. As such a position, for example, a position covering the outer periphery of the caulking part 11, particularly the tip of the caulking part 11 is preferable. Moreover, it is preferable to provide it so as to protrude forward from the tip of the heat generating layer 3 or the metal ring 6. When the tip of the heat-shrinkable tube 5 is projected in this way, the heat-shrinkable heat-shrinkable tube 5 ′ covers the tip of the metal ring 6 and the outer periphery of the hose 2 exposed in front of the metal ring 6. Leakage from the tip is suppressed. Furthermore, in order to suppress water leakage from the rear end of the fixing portion 22 of the sleeve 20, it is preferable that the rear end of the heat shrinkable tube 5 extends rearward beyond the fixing portion 22.

  The layer structure of the hose connection pipe joint 100 described above will be briefly described with reference to FIG. 2. The hose 2 is fitted on the outer periphery of the circular distal end portion 11 and is tightened by the caulking portion 21 from the outer periphery of the hose 2. And sandwiched between the tip portion 11 and the caulking portion 21. The heat generating layer 3 and the heat shrinkable tube 5 are disposed concentrically on the outer periphery of the caulking portion 21.

  In the hose connection pipe joint 100 described above, when water leaks from the joint between the hose 2 and the pipe joint 40, the heat generating layer 3 chemically reacts with the water leak to generate heat, and the outer peripheral temperature of the heat generating layer 3 rises. The rise in the outer peripheral temperature (surface temperature) of the heat generating layer 3 can be easily measured using a non-contact temperature sensor, for example, an infrared temperature sensor. Therefore, monitoring of water leakage is easy. Further, since water leakage is detected in a non-contact manner, it is not necessary to lay a wiring to a sensor disposed at the water leakage position, and a highly reliable water leakage detection system can be manufactured at low cost.

  In order to reliably detect water leakage using an infrared temperature sensor, it is desirable that the temperature rise of the heat generating layer 3 due to water leakage is large, for example, 60 ° C. or higher. In addition, when the heat generating layer 3 is at a high temperature, for example, 85 ° C. or higher, the heat-shrinkable tube 5 also reliably contracts, so that further water leakage can be effectively suppressed. From this viewpoint, the rising temperature of the heat generating layer 3 is desirably 60 ° C. or higher, more preferably 85 ° C. or higher. The temperature rise is preferably stopped at a temperature at which the flexible hose 2 or the heat shrinkable tube is not damaged, for example, 120 ° C. or less. The heat-shrinkable tube 5 must be heat-shrinkable at the temperature of the heat-generating layer 3 that has generated heat. Since the temperature of the heat generating layer 3 containing quicklime easily reaches 85 ° C. to 120 ° C., it is preferable that the heat shrinkable tube 5 also reliably heat shrinks in this temperature range.

  When detecting the temperature rise of the heat generating layer 3 using an infrared temperature sensor, the heat-shrinkable tube 5 is preferably transparent to infrared light having a wavelength sensed by the infrared temperature sensor. Further, the heat shrinkable tube 5 is made of a material that does not corrode the pipe joint 40 even if it contacts. A structure in which the heat generating layer 3 is provided and the heat shrinkable tube 5 is not provided may be employed.

  FIG. 3 is a front view of the electronic device according to the first embodiment of the present invention, and FIG. 4 is a side view of the electronic device according to the first embodiment of the present invention. This shows the positional relationship with the sensor.

  3 and 4, a plurality of hose connection fittings 100 according to the first embodiment described above are attached in a row in the horizontal direction to the front panel 1 a of the housing 1 of the electronic device. The hose connection pipe joint 100 is fixed to the front panel 1 a by using the mounting bracket 35 by passing the rear end of the joint body 10 from the front surface of the front panel 1 a through the opening formed in the front panel 1 a.

  The infrared temperature sensor 31 is fixed to the tip of a rod 32 that is fixed to the front panel 1a of the housing by a mounting jig 33. The temperature sensor 31 is provided away from the front panel 1a up to the position where the heat generating layer 3 of the pipe joint 40 is disposed (the position of the heat-shrinkable tube 5 shown in FIG. 4).

  The infrared temperature sensor 31 includes a line sensor in which infrared detection elements are arranged in a row, and has an observation field 34 that extends in a fan shape parallel to the front surface of the front panel 1 a of the housing 1. Therefore, the temperature sensor 31 can observe the temperature of the lower surfaces of the plurality of hose connection pipe joints 100 arranged in a line above the single line scan. The observation result is transmitted to the water leakage monitoring device by, for example, one laid wiring or by a wireless transmitter connected to the temperature sensor 31. When it is determined that the observed temperature indicates the occurrence of water leakage, the water leakage monitoring device issues a water leakage warning and issues a given operation command to be performed to the electronic device at the time of water leakage.

  The electronic device according to the first embodiment can detect water leakage of the plurality of hose connection pipe joints 100 with a single temperature sensor. For this reason, only one wiring to the temperature sensor is required, or the arrangement of one wireless transmitter suffices, so that a low-cost water leakage detection system that is operated at low cost and has few failures is realized.

  2nd Embodiment of this invention is related with the hose assembly which provided the hygroscopic expansion layer 4 inside the heat_generation | fever layer 3 of the hose connection pipe joint of 1st Embodiment.

  FIG. 5 is a side cross-sectional view of a hose connection pipe joint according to a second embodiment of the present invention, and shows a cross-sectional structure along a pipe axis of a hose assembly formed by connecting a pipe joint to a hose end. FIG. 6 is a front sectional view of a hose connection fitting according to a second embodiment of the present invention, showing a section perpendicular to the tube axis (AA ′ section in FIG. 5).

  The hose connection pipe joint 101 of the second embodiment is the same as that of the first embodiment except for the structure of the heat generating layer 3. Therefore, for the sake of brevity, the following description will focus on the differences of the heat generating layer 3 in particular.

  With reference to FIG.5 and FIG.6, in the hose connection pipe joint 101 of this 2nd Embodiment, the area | region where the heat generating layer 3 of 1st Embodiment shown in FIG.1 and FIG.2 is arrange | positioned is a concentric inner cylinder. Dividing into two parts, the outer cylinder, the hygroscopic expansion layer 4 is arranged in the inner cylinder area, and the heat generating layer 3 made of the same material as the heat generating layer 3 of the first embodiment is arranged in the outer cylinder area outside the inner cylinder area. That is, the hygroscopic expansion layer 4 is provided so as to cover the outer periphery of the distal end portion 11 of the joint body 10 and the outer periphery of the hose 2 exposed in front thereof. The heat generating layer 3 is provided on the outer periphery of the hygroscopic expansion layer 4. Other structures are the same as those of the hose connection fitting 100 of the first embodiment.

  The hygroscopic expansion layer 4 is composed of a hygroscopic expansion material having the property of quickly absorbing and expanding the cooling water. As such a hygroscopic expansion material, a water-absorbing resin such as polyacrylic acid-based or cellulose-based resin kneaded in a hygroscopic-swelling urethane rubber or vinyl chloride resin can be used. These materials can be used after being processed into a nonwoven fabric.

  Commercially available hygroscopic expansion materials include, as a hygroscopic expansion material mainly composed of a resin containing acrylate, the product names Aqua Pearl, Sun Fresh and Sun Wet, manufactured by Sanyo Kasei Kogyo Co., Ltd., Nippon Shokubai Co., Ltd. There are the product name Aquaric manufactured by Sumitomo Seika Co., Ltd., the product name Aqua Keep and Aqua Coke manufactured by Sumitomo Seika Co., Ltd., and the product name Bel Oasis manufactured by Teijin Fibers Limited. Further, as a hygroscopic expansion agent mainly composed of urethane rubber, there is one in which a carboxylic acid group or a sulfonic acid group having a hygroscopic function is added to a polyurethane molecule.

  In the second embodiment, when cooling water leaks from between the tip of the caulking portion 21 and the outer periphery of the hose 2, the water leakage (cooling water) is immediately absorbed by the hygroscopic expansion layer 4. The hygroscopic expansion layer 4 rapidly absorbs water and quickly diffuses throughout the hygroscopic expansion layer 4. Therefore, the leaked cooling water diffuses rapidly in the hygroscopic expansion layer 4 and quickly reaches the heat generating layer 3 in contact with the outer periphery of the hygroscopic expansion layer 4. For this reason, after the occurrence of water leakage, a wide area of the heat generating layer 3 quickly generates heat. Thus, since the heat generating layer 3 generates heat quickly after water leakage, it is possible to detect water leakage early. In addition, since a wide area of the heat generating layer 3 generates heat, it is possible to avoid a leakage detection of water leakage that occurs when the heat generation portion is narrow, and the reliability of water leakage detection is increased.

  3rd Embodiment of this invention is related with the hose connection pipe joint 102 which replaced the arrangement | positioning of the heat generating layer 3 and the moisture absorption swelling layer 4 in the hose connection pipe joint 101 of this 2nd Embodiment.

  FIG. 7 is a side cross-sectional view of a hose connection pipe joint according to a third embodiment of the present invention, and shows a cross-sectional structure along a pipe axis of a hose assembly formed by connecting a pipe joint to a hose end.

  With reference to FIG. 7, in the third embodiment, the heat generating layer 3 is provided so as to cover the outer periphery of the distal end portion 11 of the joint body 10 and the outer periphery of the hose 2 exposed in front thereof. A hygroscopic expansion layer 4 is provided on the outer periphery. Except for the arrangement of the heat generating layer 3 and the hygroscopic expansion layer 4, it is the same as the hose connection pipe joint 101 of the second embodiment. When the hygroscopic expansion layer 4 is provided on the outer periphery of the heat generating layer 3 in this way, the hygroscopic expansion layer 4 must have a necessary degree of transparency with respect to infrared light having a wavelength detected by the temperature sensor 31. .

  Thus, by arranging the heat generating layer in contact with the outer periphery of the hose 2, heat generated due to water leakage can be detected at an early stage. At this time, it is preferable to suppress water leakage to the outside by using a skin layer having a high resin density in the vicinity of the outer periphery of the hygroscopic expansion layer 4.

  The fourth embodiment of the present invention relates to a hose connection fitting 103 in which a shape memory alloy ring 9 is disposed in place of the heat shrinkable tube 5 of the first embodiment.

  FIG. 8 is a cross-sectional side view of a hose connection pipe joint according to a fourth embodiment of the present invention, and shows a cross-sectional structure along the pipe axis of a hose assembly formed by connecting a pipe joint to a hose end.

  Referring to FIG. 8, in the hose connection pipe joint 103 of the fourth embodiment, the joint body 10 and the tip 11 of the joint body 10 are inserted into the hose 2 pipe hole 2a to connect the hose 2 and the joint body 10. Further, the outer periphery of the hose 2 is tightened with the caulking portion 21. The connection structure of the hose 2 is the same as that of the second embodiment.

  As in the second embodiment, the hose connection pipe joint 103 of the fourth embodiment has a hygroscopic expansion layer 4 so as to cover the outer periphery of the distal end portion 11 of the joint body 10 and the outer periphery of the hose 2 exposed in front thereof. And the heat generating layer 3 is provided on the outer periphery of the hygroscopic expansion layer 4. The arrangement and materials of the hygroscopic expansion layer 4 and the heat generation layer 3 are the same as those in the second embodiment.

  In the hose connection pipe joint 103 of the fourth embodiment, a shape memory alloy ring 9 made of a shape memory alloy is provided on the outer periphery of the hygroscopic expansion layer 4 and concentrically with the tip 11 of the joint body 10. The shape memory alloy ring 9 is fitted and fixed to the outer periphery of the heat generating layer 3 at a normal operating temperature, and contracts due to heat generation of the heat generating layer 3 due to water leakage to tighten the vicinity of the tip of the caulking portion 21 from the outer periphery. As a result, water leakage from between the caulking portion 21 and the hose 2 is suppressed. Tightening by the memory shape alloy ring 9 can be made stronger than the heat tube 3 easily. Therefore, the effect of suppressing water leakage is greater than when the heat tube 3 is used.

  In the first to fourth embodiments of the present invention described above, the hose assembly in which the pipe joint 40 is connected to the flexible hose 2 has been described. However, the present invention is not limited to this, and can be widely applied to a mechanism for connecting a flexible hose to a pipe joint.

  In the above-described hose connection pipe joints 100 to 103 of the present invention, heat generation of the heat generation layer 3 is observed using, for example, an infrared temperature sensor, and water leakage is detected. At this time, if heat generation is observed even in a part of the temperature observation visual field, it is detected as water leakage. Thus, by not specifying the heat generation position, the temperature sensor driving device can be simplified, and an inexpensive cooling system with few failures can be realized.

  However, it is difficult to confirm the leak position at a glance with this method. Therefore, the water leaking portion may be visually confirmed at a glance by mixing a pigment that develops or changes color when exposed to water in the heat generating layer 3 or the hygroscopic expansion layer 4 of the hose connection pipe joints 100 to 103. . Of course, if necessary, the temperature sensor and its driving device can be provided with a function for specifying the heat generation position in the temperature observation field.

  By applying the present invention to a hose pipe joint of a cooling system of an electronic device or a mechanical device, a cooling system that can detect water leakage quickly and reliably is realized.

DESCRIPTION OF SYMBOLS 1 Case 1a Front panel 1b Mounting hole 1c Female screw 1d Front 1e Inside of housing 2 Hose 2a Pipe hole 3 Heat generation layer 4 Hygroscopic expansion layer 5, 5 'Heat contraction tube 6 Metal ring 9 Shape memory alloy tube 100 Hose connection pipe joint 10 Joint body 11 Tip portion 12 Center portion 13 Rear end portion 15, 16, 23 Screw 20 Sleeve 21 Caulking portion 22 Fixing portion 31 Temperature sensor 32 Bar 33 Mounting jig 34 Observation field 35 Mounting bracket 40 Pipe joint 100 to 103 Hose connection tube Fitting

Claims (5)

In the hose connection pipe joint in which the hose that flows water is connected to the pipe joint,
A tip formed at the tip of the pipe joint and inserted into the tube hole of the hose;
A sleeve that is provided so as to cover an outer periphery of the hose into which the tip portion is inserted, and sandwiches the hose between the tip portion,
An exothermic layer that covers the outer periphery of the sleeve and the hose and extends from the sleeve to the hose and reacts exothermically with the water;
A hose connection pipe joint characterized by comprising:   The hose connection fitting according to claim 1, further comprising a temperature sensor that detects heat generation of the heat generation layer in a non-contact manner.   The hose connection pipe joint according to claim 1, wherein a heat shrinkable tube that shrinks due to heat generated by the heat generating layer is provided on an outer periphery of the heat generating layer.   The hose connection pipe joint according to claim 1 or 2, wherein a shape memory alloy tube that contracts due to heat generated by the heat generating layer is provided on an outer periphery of the heat generating layer.   5. The hose connection pipe joint according to claim 1, further comprising a hygroscopic expansion layer that is in contact with the inner periphery of the heat generation layer or the outer periphery of the heat generation layer and that absorbs and expands the moisture by contact with the water. .

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