Fluid leakage sensing system and method for marine hose

Abstract

The invention provides a fluid leakage sensing system and method for a marine hose, which can sense the presence or absence of fluid leakage of various types of marine hoses with high precision. A detection element (15) for forming a loop circuit (17) connected to a passive IC tag (11) is made to continuously extend in the longitudinal direction of the hose body between an inner surface layer (3) and a first reinforcement layer (4) by using a conductive rubber or a conductive paste having a resistance value that changes to a reference value or more as a result of the infiltration of a fluid (L), and the IC tag (11) is disposed on the surface of a marine hose (1). Resistance value data Dr in the loop circuit 17 when the IC tag 11 is activated by the transmission radio wave R1 transmitted from the communication device 19 is transmitted to the communication device 19 by a reply radio wave R2 transmitted by the IC tag 11 in accordance with the transmission radio wave R1 and input to the arithmetic device 20, and the presence or absence of leakage of the fluid L is determined on the basis of the magnitude of the difference between the resistance value data Dr and the reference resistance value data Dc.

Description

Technical Field

[0001] The present invention relates to a fluid leakage sensing system and method for a ship hose, and more particularly to a fluid leakage sensing system and method for a ship hose capable of accurately sensing whether various types of ship hoses have fluid leakage. Background Art

[0002] In a so-called double-layer marine hose, fluid leaking from a flow path is temporarily stored in a fluid retention layer formed between reinforcing layers stacked at intervals in the radial direction of the hose to prevent the fluid from leaking out of the hose. A fluid leakage sensing system has been proposed that uses an IC tag disposed in the fluid retention layer to sense fluid leakage (for example, see Patent Document 1).

[0003] However, there are single-frame type marine hoses that do not have a fluid retention layer. Although it is desired to be able to sense fluid leakage from the flow path in single-frame type marine hoses, an appropriate sensing means has not yet been established. Therefore, there is room for improvement in accurately sensing the presence or absence of fluid leakage in various types of marine hoses.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2020-133766 Summary of the invention

[0007] Problems to be solved by the invention

[0008] An object of the present invention is to provide a fluid leakage sensing system and method for a ship hose, which can accurately sense whether or not there is fluid leakage in various types of ship hoses.

[0009] Technical means of solving problems

[0010] In order to achieve the above-mentioned object, the fluid leakage sensing system of the ship hose of the present invention comprises a hose body having a reinforcing layer and a buoyancy layer stacked in sequence from the inner circumference side between an inner surface layer and an outer surface layer, and connecting metal parts respectively connected to both ends of the hose body in the length direction, and uses the inner circumference area of ​​the inner surface layer as a flow path, and is characterized by comprising: the ship hose; a sensor having a passive IC tag and a ring loop formed by a detection element connected to the IC tag; a communication device arranged on the outer side of the ship hose and wirelessly communicating with the IC tag; and a computing device that inputs acquisition data acquired by the communication device, the IC tag being arranged on the surface of the ship hose, the detection element being immersed in the fluid flowing in the flow path The IC tag is activated by a transmitting radio wave sent from the communication device, and the activated IC tag sends a reply radio wave according to the transmitting radio wave, thereby wireless communication is performed between the IC tag and the communication device. The resistance value data in the circular loop when the IC tag is activated is sent from the IC tag to the communication device through the reply radio wave, and is input into the operation device as the acquired data. The operation device determines whether the fluid is leaking from the flow path based on the difference between the input acquired data and the preset reference resistance value data.

[0011] The method for sensing fluid leakage of a ship hose of the present invention comprises a hose body having a reinforcing layer and a buoyancy layer sequentially stacked from the inner circumference between an inner surface layer and an outer surface layer, and connecting metal fittings respectively connected to both ends of the hose body in the length direction, and the inner circumference area of ​​the inner surface layer is used as a flow path. The method is characterized in that a sensor having a passive IC tag and a loop formed by a detection element connected to the IC tag is used; a communication device arranged on the outer side of the ship hose and wirelessly communicating with the IC tag; and a computing device inputting acquired data acquired by the communication device is used, the IC tag is arranged on the surface of the ship hose, and the detection element is impregnated with the fluid flowing in the flow path, so that the resistance value changes to a predetermined value. The conductive rubber or conductive paste is formed above a previously set reference and extends continuously along the length direction of the hose body between the inner surface layer and the reinforcement layer. The IC tag is activated by a transmission wave sent from the communication machine, and the IC tag sends a reply wave to the communication machine based on the transmission wave, thereby wireless communication is performed between the IC tag and the communication machine, and the resistance value data in the circular loop when the IC tag is activated is sent from the IC tag to the communication machine through the reply wave and input into the operation device as the acquired data. The operation device determines whether the fluid is leaking from the flow path based on the difference between the input acquired data and the preset reference resistance value data.

[0012] Effects of the Invention

[0013] According to the present invention, the sensor is provided on the ship hose by configuring the IC tag on the surface of the ship hose and making the loop continuously extend along the length direction of the hose body between the inner surface layer and the reinforcement layer, so that the sensor can be provided in any type of the so-called single-frame layer type and double-frame layer type. In addition, if the fluid leaks from the flow path to the outer peripheral side of the inner surface layer and penetrates into the detection element forming the loop, the resistance value in the loop when the IC tag is activated by the transmission wave will change significantly to a value greater than a preset reference. Therefore, it is possible to grasp the presence or absence of the fluid leakage from the flow path based on the size of the difference between the resistance value data input into the computing device as the acquisition data and the preset reference resistance value data. Since the resistance value data can be acquired by wireless communication using the reply wave sent to the communication device by the passive IC tag according to the transmission wave from the communication device, it also greatly contributes to the reduction of the fluid leakage confirmation operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1This is an explanatory diagram illustrating an example of a ship hose to which an embodiment of the sensing system is applied.

[0015] Figure 2 Yes Figure 1 An explanatory diagram showing a partially enlarged longitudinal section of a ship hose.

[0016] Figure 3 So Figure 2 An explanatory diagram showing a part of a ship hose by way of example, taken along the AA cross-sectional view.

[0017] Figure 4 This is an explanatory diagram showing a sensor from a top view as an example.

[0018] Figure 5 This is an example from a side view. Figure 4 Illustration of the sensor.

[0019] Figure 6 This is shown as an example from a longitudinal section perspective. Figure 2 Illustration of the housing and sensor.

[0020] Figure 7 This is an explanatory diagram showing an example of the configuration of a loop circuit by partially cutting away a ship hose from a top view.

[0021] Figure 8 This is an explanatory diagram showing an improved example of the sensor from a top view.

[0022] Fig. 9 This is an example of a partially cutaway view of a ship hose from the top. Figure 8 An illustration of the configuration of a ring loop of sensors.

[0023] Fig.10 yes Fig. 9 BB cross-sectional view.

[0024] Fig.11 This is an explanatory diagram that shows an example of a partially enlarged longitudinal section of another ship hose to which the sensing system is applied. DETAILED DESCRIPTION

[0025] Next, a fluid leakage sensing system for a hose for a ship (hereinafter referred to as a sensing system) and a method thereof according to the present invention will be described based on the embodiments shown in the drawings.

[0026] Fig.11The embodiment of the sensing system illustrated in the example is applied to a floating ship hose 1 used in a state of floating on the water surface to sense whether a fluid L leaks from a flow path 1a. The ship hose 1 is composed of a cylindrical hose body and connecting metal fittings 2 connected to both ends of the hose body in the long dimension direction. Each connecting metal fitting 2 has a pipe joint 2b extending in the length direction of the hose body and a flange 2a joined to one end of the pipe joint 2b in the length direction. The ship hoses 1 are connected to each other by the connecting metal fittings 2. Generally, about 10 ship hoses 1 are connected and used.

[0027] like Figure 2 , Figure 3 As shown in the example, on the hose body between the pipe joints 2b at both ends in the longitudinal direction of the ship hose 1, the inner surface layer 3, the first reinforcement layer 4, the buoyancy layer 8, and the outer surface layer 9 are stacked in order from the inner circumference to the outer circumference. Since the hose body does not have the fluid retention layer 7 described later, the ship hose 1 is a single skeleton layer type. The inner circumference area of ​​the inner surface layer 3 is a flow path 1a of the fluid L. As examples of the fluid L, crude oil, heavy oil, gasoline, LPG (Liquefied Petroleum Gas: liquefied petroleum gas), water, seawater, chemicals (alcohols obtained by refining gasoline), etc. can be shown.

[0028] The inner surface layer 3 is made of a material having excellent durability and corrosion resistance to the fluid L, selected from a suitable material according to the type of the fluid L. When the fluid L is crude oil, heavy oil, gasoline, etc., the inner surface layer 3 is made of nitrile rubber or the like having excellent oil resistance.

[0029] The first reinforcement layer 4 is formed by laminating a plurality of reinforcing cord layers 4A to 4H formed by covering a plurality of parallel reinforcing cords with rubber. In this embodiment, a reinforcing cord layer group formed by laminating eight reinforcing cord layers 4A to 4H is the first reinforcement layer 4, and the number of laminations of the reinforcing cord layers 4A to 4H is appropriately determined based on the performance required for the marine hose 1. The first reinforcement layer 4 is fixed to each pipe joint 2b using pipe joint wires 4w located at both ends and fixing rings 2c protruding from the outer peripheral surface of each pipe joint 2b.

[0030] The buoyancy layer 8 is made of a material such as sponge rubber or foamed polyurethane that exerts buoyancy to make the ship hose 1 float on the sea. The outer surface layer 9 is made of a water-impermeable material such as rubber, and has a line pattern or the like with excellent visual visibility on its surface.

[0031] The sensing system includes a ship hose 1, a sensor 10, a communication device 19, and a computing device 20. The communication device 19 is arranged outside the ship hose 1 separately from the ship hose 1. In this embodiment, the communication device 19 and the computing device 20 are formed integrally, but they may be designed to be separate and independent structures.

[0032] like Figure 4 , Figure 5 As shown in the example, the sensor 10 has a passive IC tag 11 and a loop 17 connected to the IC tag 11. The IC tag 11 is arranged on the surface of the marine hose 1 and is located above the water. The loop 17 is formed by the detection element 15 and extends continuously along the length direction of the hose body between the inner surface layer 3 and the first reinforcement layer 4.

[0033] In detail, the IC tag 11 includes an IC chip 12 and an antenna unit 13 connected to the IC chip 12. The IC chip 12 and the antenna unit 13 are arranged on a substrate 14. The IC chip 12 and the antenna unit 13 are covered by an insulating layer 14a so that the IC tag 11 is electrically insulated from the outside as a whole. However, the IC tag 11 is electrically connected to the detection element 15 in a manner that allows electricity to flow. The insulating layer 14a is formed of a known insulating material such as insulating rubber, resin such as polyester, and natural fiber.

[0034] The IC chip 12 may store tag-specific information such as the identification number of the IC tag 11, element identification information for specifying the detection element 15 connected to the IC tag 11, and other necessary information. The antenna portion 13 may use various known types, and in this embodiment, a dipole antenna extending symmetrically from the IC chip 12 is used. The antenna portion 13 is formed in a shape that is appropriately folded back to increase the extension length within a limited space.

[0035] The IC tag 11 adopts the specifications of conventional circulation, for example, an RFID tag can be used. The size of the IC chip 12 is very small, for example, the longitudinal size and the lateral size are respectively less than 50 mm (less than 50 mm in terms of outer diameter), and the thickness is less than 5 mm. The size of the antenna part 13 is also very small, for example, the longitudinal size and the lateral size are respectively less than 50 mm (less than 50 mm in terms of outer diameter), and the thickness is less than 10 mm.

[0036] The detection element 15 is a conductive linear body, which is formed by a conductive rubber or conductive paste (a paste containing metal particles) that changes the resistance value to a predetermined reference value or above when impregnated with the fluid L flowing in the flow path 1a. If the difference in the resistance value of the detection element 15 corresponding to the presence or absence of fluid L impregnation is too small, the sensitivity of sensing the leakage of the fluid L is reduced. Therefore, it is preferred that the difference in the resistance value of the detection element 15 is greater when the fluid L is impregnated than when it is not impregnated. Thus, based on the resistance value per unit length in the unit cross-sectional area of ​​the detection element 15 in the state where the fluid L is not impregnated, the resistance value per unit length in the unit cross-sectional area of ​​the detection element 15 when the fluid L is impregnated is set to, for example, more than twice the reference, preferably more than three times, and more preferably more than five times. It should be noted that the resistance value when the fluid L is impregnated is a value measured when the fluid L is attached to the entire peripheral surface of the detection element 15 in a linear state. As described above, in order to make the resistance value of the detection element 15 equal to or higher than a predetermined reference value due to the infiltration of the fluid L, for example, the content ratio of the conductive component and the insulating component of the detection element 15 may be adjusted.

[0037] When the detection element 15 bends with the local bending of the ship hose 1, the resistance value of the detection element 15 will increase to some extent. Therefore, it is not clear whether the change in the resistance value of the detection element 15 is caused by the infiltration of the fluid L into the detection element 15 or the bending of the detection element 15. Therefore, it is preferred that the difference in the resistance value when bent is smaller than when the detection element 15 is not bent. Thus, based on the resistance value per unit length in the unit cross-sectional area of ​​the detection element 15 in the straight state, the resistance value per unit length in the unit cross-sectional area of ​​the detection element 15 in the bent state is set to, for example, 1.5 times or less of the reference, preferably 1.3 times or less, and more preferably 1.1 times or less. In addition, the resistance value of the detection element 15 in the bent state is a value measured in the state where the detection element 15 is bent 90°. As described above, in order to make the resistance value of the detection element 15 in the bent state below a predetermined reference, for example, the content ratio of the elastic component of the detection element 15 needs to be adjusted.

[0038] The outer diameter (width) of the detection element 15 is, for example, 1 mm to 20 mm, more preferably 5 mm to 10 mm. The detection element 15 may be a simple wire having a circular cross section, but is preferably designed as a flat linear body (belt-shaped wire).

[0039] The outer peripheral surface of the detection element 15 is covered by an insulator 16, so that the detection element 15 is electrically insulated from the outside. The insulator 16 is formed of a known insulating material, like the insulating layer 14a. However, the insulator 16 is formed of a material that allows the fluid L to penetrate, or has a through hole, so that the fluid L can pass through the insulator 16 and reach the detection element 15.

[0040] One end and the other end of the detection element 15 in the length direction are electrically connected to the IC chip 12, respectively, to form a ring loop 17 outside the IC tag 11. The interval between the detection elements 15 extending in parallel in the ring loop 17 is, for example, 5 mm or more and 50 mm or less. A plurality of paired terminals connected to the IC chip 12 are provided on the IC tag 11 (substrate 14). One end and the other end of the detection element 15 in the length direction are respectively connected to the paired terminals, thereby being electrically connected to the IC chip 12. The detection element 15 and the paired terminals are connected using a metal ring and a crimping terminal, or are connected by a conductive adhesive, welding, soldering, etc. In this embodiment, 5 groups of paired terminals are provided, but the number of paired terminals provided on the IC tag 11 (substrate 14) is not particularly limited and may be 1. Due to space constraints, the number of paired terminals provided on one IC tag 11 (substrate 14) is, for example, about 1 to 6.

[0041] The IC tag 11 is preferably disposed at the end of the ship hose 1 in the longitudinal direction. The loop 17 (detection element 15) preferably extends continuously from one end of the hose body in the longitudinal direction to the other end to cover the entire length of the hose body. In this embodiment, the IC tag 11 is disposed on the surface of the connecting metal member 2 (the outer peripheral surface of the pipe joint 2b) at one end of the hose body in the longitudinal direction. In detail, Figure 6 As shown in the example, the IC tag 11 is provided inside the housing 18. The housing 18 has a cylindrical base 18a and a cover 18b attached to the upper end of the base 18a.

[0042] The base 18a is erected on the outer peripheral surface of the pipe joint 2b covered by the outer surface layer 9. The base 18a is formed of a metal such as stainless steel. The cover 18b is screwed with the upper end of the base 18a to watertightly block the upper end opening, and the IC tag 11 is arranged in the watertightly blocked internal space of the housing 18. The cover 18b is formed of a material that allows the transmission radio wave R1 and the reply radio wave R2 to pass through, and as such a material, polycarbonate, polyamide, epoxy resin, etc. are used. The housing 18 (cover 18b) can be designed to be orange, for example, to make it eye-catching in the ocean.

[0043] The detection element 15 (annular loop 17) extends from the inside of the housing 18 to the hose body, is arranged between the inner surface layer 3 and the first reinforcement layer 4 in the hose body, and extends continuously from one end to the other end in the length direction of the hose body. Figure 7As shown in the example, the annular loop 17 is spirally wound relative to the hose body and extends from one end to the other end in the length direction of the hose body. That is, the annular loop 17 is spirally wound on the outer peripheral surface of the inner surface layer 3. The spiral pitch of the annular loop 17 is, for example, not less than 20 cm and not more than 50 cm. It should be noted that the single-point chain line CL in the figure is the axis passing through the cross-sectional center CL of the ship hose 1 (hose body). If the annular loop 17 is extended in a spiral shape like this, there is an advantage that the entire range of the hose body can be effectively covered even if there is only one annular loop 17.

[0044] The communication device 19 includes a radio wave transmitter 19a and a radio wave receiver 19b. The transmission radio wave R1 is transmitted from the radio wave transmitter 19a to the IC tag 11, and the radio wave receiver 19b receives the reply radio wave R2 transmitted from the IC tag 11. The IC tag 11 is activated by the transmission radio wave R1, and the activated IC tag 11 sends the reply radio wave R2 according to the transmission radio wave R1, thereby wireless communication is performed between the IC tag 11 and the communication device 19.

[0045] As the communication device 19, a commonly used specification that can wirelessly communicate with a passive RFID tag is adopted. Thus, the IC tag 11 and the communication device 19 constitute an RFID (Radio Frequency IDentification) system. Since a passive IC tag 11 is used, the communication distance of the radio waves R1 and R2 between the IC tag 11 and the communication device 19 is, for example, about several tens of centimeters or more and several meters or less.

[0046] The frequencies of radio waves (R1, R2) used for wireless communication between the IC tag 11 and the communication device 19 are mainly in the UHF band (depending on the country, but in the range of 860 MHz to 930 MHz, in Japan it is 915 MHz to 930 MHz), and the HF band (13.56 MHz) can also be used. For example, a monitor may be attached to the communication device 19.

[0047] The computing device 20 performs various computing processes using the input data. A known computer is used as the computing device 20, and reference resistance value data Dc is input in advance into the computing device 20. The reference resistance value data Dc refers to the resistance value in the loop 17 when the IC tag is activated when the ship hose 1 is intact and the fluid L does not leak from the flow path 1a. The reference resistance value data Dc is grasped and determined by performing a preliminary test or the like. The computing device 20 also inputs the acquisition data acquired by the communication device 19. For example, an output device such as a monitor is connected to the computing device 20.

[0048] Hereinafter, an example of a sensing procedure for determining whether or not leakage of the fluid L has occurred from the flow path 1 a using this sensing system will be described.

[0049] For example, in order to realize the leakage confirmation operation of the fluid L, the operator needs to board the work boat or the like regularly or at a necessary time to approach the ship hose 1 and install the communication device 19 at a confirmation position where wireless communication with the IC tag 11 can be performed. Figure 2 As shown in the example, the radio wave transmitting unit 19 a transmits the radio wave R1 to the IC tag 11 , and the IC tag 11 generates power and activates itself by the radio wave R1 .

[0050] In detail, the IC tag 11 generates power through the transmission radio wave R1 received by the antenna unit 13, and the IC tag 11 is activated. Using this power, the activated IC tag 11 transmits a reply radio wave R2 through the antenna unit 13, and the reply radio wave R2 is received by the radio wave receiving unit 19b. When the IC tag 11 is activated, a current flows through the loop 17, and the resistance value data Dr in the loop 17 is stored in the IC tag 11. The resistance value data Dr is transmitted from the IC tag 11 to the communication device 19 through the reply radio wave R2. The resistance value data Dr is received by the radio wave receiving unit 19b, and then input into the computing device 20 as the acquired data acquired by the communication device 19.

[0051] The computing device 20 determines whether the fluid L leaks from the flow path 1a based on the difference between the input resistance value data Dr and the preset reference resistance value data Dc. When the inner surface layer 3 is intact and the fluid L does not leak from the inner surface layer 3, the resistance value data Dr of the annular loop 17 is substantially the same as the reference resistance value data Dc, with almost no difference.

[0052] On the other hand, if the inner surface layer 3 is damaged and the fluid L leaks out of the flow path 1a to the outside of the inner surface layer 3, the fluid L contacts the detection element 15 forming the loop 17, and the resistance value of the loop 17 changes rapidly and greatly (becomes extremely large), becoming an insulating state or a state close to insulating. That is, the resistance value data Dr of the loop 17 when the IC tag 11 is activated becomes significantly larger than the reference resistance value data Dc.

[0053] Thus, the computing device 20 compares the input resistance value data Dr with the reference resistance value data Dc. As a result, if the resistance value data Dr is larger than the reference resistance value data Dc and exceeds the allowable range AR, it is determined that the fluid L has leaked from the flow path 1a, and the result is notified through the monitor display or sound. If the difference between the resistance value data Dr and the reference resistance value data Dc is within the allowable range AR, it is determined that the fluid L has not leaked from the flow path 1a, and the result is notified through, for example, the monitor display.

[0054] In this way, it is possible to accurately determine whether there is leakage of the fluid L based on the difference between the resistance value data Dr received by the radio wave receiving unit 19b and the reference resistance value data Dc. The allowable range AR can be appropriately set by performing a prior test, etc. According to this embodiment, it is possible to accurately sense a small leakage in which cracks are generated in the inner surface layer 3 and the fluid L gradually leaks out along the outer peripheral surface of the inner surface layer 3.

[0055] The computing device 20 may be designed to be connected to a terminal device such as a computer or a smart phone located at a location (remote location) far from the site of use of the ship hose 1 via a communication network such as the Internet. According to this structure, the computing device 20 can send the resistance value data Dr and the judgment result of the computing device 20 (whether there is leakage of the fluid L) to the terminal device located at a location far from the site of use of the ship hose 1 through the communication network. For example, the resistance value data Dr and the judgment result of the computing device 20 are sent to the terminal device of the management office of the operating company (user) of the ship hose 1, the sales company of the ship hose 1, the manufacturing company and other related companies located at a location far from the site of use of the ship hose 1, and these related companies can grasp the status of the ship hose 1 at a remote location far from the site of use of the ship hose 1.

[0056] You can also use Figure 8 The sensor 10 is shown as an example. Multiple (4) detection elements 15a, 15b, 15c, 15d of the sensor 10 are connected to one IC tag 11. The outer peripheral surface of each detection element 15a, 15b, 15c, 15d is covered by an insulator 16. Each detection element 15a, 15b, 15c, 15d forms an independent ring loop 17a, 17b, 17c, 17d. Therefore, multiple (4) independent ring loops 17a to 17d are connected to one IC tag 11.

[0057] like Fig. 9 , Fig.10 As shown in the example, in the ship hose 1 having the sensor 10, the independent loops 17a to 17d are arranged at intervals in the circumferential direction relative to the hose body and extend linearly in the longitudinal direction of the hose body. The loops 17a to 17d are preferably arranged at equal intervals in the circumferential direction of the hose body.

[0058] If the sensor 10 is used, even if one of the loops 17 fails for some reason, the presence or absence of leakage of the fluid L can be detected through the other loops 17. In addition, compared with the case where the loops 17 are extended in a spiral shape, the total length of each loop 17a to 17d can be shortened, so it is advantageous to more sensitively (with high sensitivity) sense the change in the resistance value in each loop 17a to 17d. In addition, when the sensor 10 is used, each loop 17a to 17d can be staggered in the longitudinal direction of the hose body and spirally wound relative to the hose body.

[0059] The above-mentioned sensing system is not limited to being applied to a single-frame ship hose 1, but can also be applied to a double-frame ship hose 1 having a fluid retention layer 7 on the hose body. Fig.11 In the hose body of the ship hose 1 shown as an example, an inner surface layer 3, a first reinforcement layer 4, a main body layer 5, a fluid retention layer 7, a second reinforcement layer 6, a buoyancy layer 8, and an outer surface layer 9 are sequentially stacked from the inner circumference to the outer circumference. The ship hose 1 is a double-framed layer type having the first reinforcement layer 4 and the second reinforcement layer 6 stacked at intervals in the radial direction of the hose body via the fluid retention layer 7. The main body layer 5 can be arbitrarily provided.

[0060] The first reinforcement layer 4 and the second reinforcement layer 6 are respectively formed by laminating a plurality of reinforcement cord layers formed by rubber-coated parallel reinforcement cords. The main body wire layer 5 is formed by spirally winding metal wires at predetermined intervals on the outer peripheral surface of the first reinforcement layer 4. The first reinforcement layer 4, the main body wire layer 5, and the second reinforcement layer 6 are fixed to the respective pipe nipples 2b using pipe nipple wires 4w, 5w, 6w located at both ends of each and fixing rings 2c protruding from the outer peripheral surface of the pipe nipples 2b at both ends of the hose body. The fluid retention layer 7 formed between the first reinforcement layer 4 and the second reinforcement layer 6 becomes a space for storing the fluid L leaking from the flow path 1a.

[0061] In the ship hose 1, the annular loop 17 is arranged inside the fluid retention layer 7. Therefore, if the fluid L leaked due to damage to the inner surface layer 3 passes through the main line layer 5 and flows into the fluid retention layer 7, the fluid L will contact the detection element 15 forming the annular loop 17, causing the resistance value of the annular loop 17 to change rapidly and significantly (become extremely large), and become an insulating state or a state close to insulation. That is, the resistance value data Dr of the annular loop 17 when the IC tag 11 is activated becomes significantly larger than the reference resistance value data Dc. When the inner surface layer 3 is intact and the fluid L has not leaked from the inner surface layer 3, there is almost no difference between the resistance value data Dr of the annular loop 17 and the reference resistance value data Dc. Therefore, as described above, the presence or absence of fluid L leakage can be judged with high accuracy based on the size of the difference between the resistance value data Dr received by the radio wave receiving unit 19b and the reference resistance value data Dc.

[0062] If the fluid L flows into a part of the fluid retention layer 7, the fluid L gradually spreads over the entire length of the fluid retention layer 7. Therefore, when the loop 17 is arranged inside the fluid retention layer 7, the loop 17 does not need to be extended that long. Thus, the loop 17 continuously extends from one end of the hose body in the length direction to a position that is, for example, 20% to 50% of the entire length of the hose body.

[0063] In the ship hose 1, it is also possible to Figure 2 The design is similar to the ship hose 1 shown in the example of FIG. 1 , in which the loop 17 is arranged on the outer peripheral surface of the inner surface layer 3. When the loop 17 is arranged on the outer peripheral surface of the inner surface layer 3, it is preferably extended continuously from one end of the hose body to the other end in the length direction. In addition, in the ship hose 1, the loop 17 may also be arranged as follows. Figure 7 As shown in the example, the specification designed to be spirally wound and extended relative to the hose body can also be as follows Fig. 9 , Fig.10 As shown in the example, the design is such that a plurality of endless loops 17 are arranged at intervals in the circumferential direction of the hose body and extend linearly in the longitudinal direction of the hose body.

[0064] As described above, the sensing system can be applied to any type of marine hose 1, so-called single-frame type and double-frame type, and therefore has high versatility. In addition, since the resistance value data Dr can be acquired by wireless communication using the reply radio wave R2 sent by the IC tag 11 to the communication device 19 in response to the transmission radio wave R1 from the communication device 19, it also greatly contributes to the easing of the fluid leakage confirmation operation. Since a passive IC tag 11 is used, there is no need to monitor the battery consumption of the IC tag 11.

[0065] Description of Reference Numerals

[0066] 1: Marine hose

[0067] 1a: Flow path

[0068] 2: Connecting metal parts

[0069] 2a: Flange

[0070] 2b: Pipe joint

[0071] 2c: Fixed ring

[0072] 3: Inner surface layer

[0073] 4: First enhancement layer

[0074] 4A~4H: Reinforced cord layer

[0075] 4w: pipe joint line

[0076] 5: Main line layer

[0077] 5w: pipe joint line

[0078] 6: Second enhancement layer

[0079] 6w: pipe joint line

[0080] 7: Fluid retention layer

[0081] 8: Buoyancy layer

[0082] 9: Outer surface layer

[0083] 10: Detector

[0084] 11: IC tag

[0085] 12: IC chip

[0086] 13: Antenna

[0087] 14: Substrate

[0088] 14a: Insulation layer

[0089] 15 (15a, 15b, 15c, 15d): Detection element

[0090] 16: Insulator

[0091] 17 (17a, 17b, 17c, 17d): Ring loop

[0092] 18: Shell

[0093] 18a: Base

[0094] 18b: Cover

[0095] 19: Communication machine

[0096] 19a: Radio wave transmission unit

[0097] 19b: Radio wave receiving unit

[0098] 20: Computing device

Claims

1. A fluid leakage sensing system for a ship hose, the fluid leakage sensing system for a ship hose comprising a hose body having a reinforcement layer and a buoyancy layer stacked in order from the inner circumference between an inner surface layer and an outer surface layer, and connecting metal parts respectively connected to both ends of the hose body in the longitudinal direction, and using the inner circumference area of ​​the inner surface layer as a flow path, wherein: The device comprises: the ship hose; a sensor having a passive IC tag and a loop formed by a detection element connected to the IC tag; a communication device arranged outside the ship hose and communicating wirelessly with the IC tag; and a computing device that inputs the acquired data acquired by the communication device. The IC tag is arranged on the surface of the ship hose, the detection element is formed of a conductive rubber or conductive paste which changes the resistance value to a predetermined level or above when the fluid flowing in the flow path is infiltrated, and extends continuously along the length direction of the hose body between the inner surface layer and the reinforcement layer. The IC tag is activated by the transmission wave sent from the communication device, and the activated IC tag sends a reply wave according to the transmission wave, thereby wireless communication is performed between the IC tag and the communication device. The resistance value data in the circular loop when the IC tag is activated is sent from the IC tag to the communication machine via the reply radio wave and is input into the computing device as the acquired data. The computing device determines whether the fluid is leaking from the flow path based on the difference between the input acquired data and the preset reference resistance value data.

2. The fluid leakage sensing system for a marine hose according to claim 1, wherein: The annular loop is spirally wound and extends relative to the hose body.

3. The fluid leakage sensing system for a marine hose according to claim 1, wherein: A plurality of the annular loops are provided, and each of the annular loops is arranged at intervals in the circumferential direction with respect to the hose body and extends linearly in the longitudinal direction of the hose body.

4. The fluid leakage sensing system for a marine hose according to any one of claims 1 to 3, wherein: The marine hose is of a monolayer type having only one reinforcing cord layer group as the reinforcing layer, and the annular loop is arranged on the outer peripheral surface of the inner surface layer.

5. The fluid leakage sensing system for a marine hose according to any one of claims 1 to 3, wherein: The ship hose is a double-layer type having two reinforcing layers stacked at intervals in the radial direction of the hose body via a fluid retaining layer, and the endless loop is arranged on the outer peripheral surface of the inner surface layer or the fluid retaining layer.

6. A method for sensing fluid leakage of a ship hose, the ship hose comprising a hose body having a reinforcement layer and a buoyancy layer stacked in order from the inner circumference between an inner surface layer and an outer surface layer, and connecting metal fittings connected to both ends of the hose body in the longitudinal direction, and using the inner circumference area of ​​the inner surface layer as a flow path, wherein: A sensor having a passive IC tag and a loop formed by a detection element connected to the IC tag; a communication device arranged outside the ship hose and communicating wirelessly with the IC tag; and a computing device inputting acquired data acquired by the communication device, The IC tag is arranged on the surface of the ship hose, the detection element is formed of a conductive rubber or conductive paste that changes the resistance value to a predetermined level or above when the fluid flowing in the flow path is impregnated, and extends continuously along the length direction of the hose body between the inner surface layer and the reinforcement layer. The IC tag is activated by a transmission wave sent from the communication machine, and the IC tag sends a reply wave to the communication machine according to the transmission wave, thereby wireless communication is performed between the IC tag and the communication machine, and the resistance value data in the loop when the IC tag is activated is sent from the IC tag to the communication machine through the reply wave and input into the computing device as the acquired data. The computing device determines whether the fluid is leaking from the flow path based on the magnitude of a difference between the input acquisition data and preset reference resistance value data.

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