Assembly of case and top cover for fluid leakage sensor for marine hose, and fluid leakage sensing system for marine hose

Abstract

The invention provides an assembly of a housing and a top cover, which can improve the durability of a sensor, reduce the damage risk of the sensor and an object caused by the contact of the sensor and the object, and ensure a good wireless communication state with the sensor, and a fluid leakage sensing system of a marine hose provided with the assembly. In a housing (18) in which a pressure sensor part (15) and an IC tag (12) are housed in a pressure holding chamber (18c) formed by a base part (18a) and a radio wave transmission part (18b), at least three metal protrusions (19) are made to protrude upward from the base part (18a) than the radio wave transmission part (18b) at intervals in the circumferential direction at positions on the outer circumferential side of the radio wave transmission part (18b) in plan view. The upper ends of the protrusions (19) are separated from each other, and an annular top cover (20) made of resin or rubber, which continuously covers the upper ends of the protrusions (19) in the circumferential direction in plan view, is fixed to the housing (18). An inner peripheral region and an outer peripheral region with respect to each of the protrusions (19) communicate with each other through a gap between the lower end portions of the protrusions (19) adjacent in the circumferential direction.

Description

Technical Field

[0001] The present invention relates to a combination of a housing and a top cover for a fluid leakage sensor of a ship hose

[0002] A fluid leakage sensing system for a body and a hose for a ship, and more particularly, a fluid leakage sensing system capable of

[0003] Improve the durability of the sensor and reduce damage to both the sensor and the object caused by contact

[0004] An assembly of a housing and a top cover, and a fluid leakage sensing system for a hose for a ship having the assembly, which can reduce risks while ensuring a good wireless communication state with a sensor. Background Art

[0005] In a marine hose, a fluid retention layer is provided between the reinforcement layers to prevent the leaked fluid from leaking out.

[0006] It can be temporarily stored in the fluid retention layer to prevent it from leaking out of the hose.

[0007] In the case where the fluid leaks into the fluid retaining layer, various fluid leakage sensing systems have been proposed (for example, refer to Patent Document 1).

[0008] In the fluid leakage sensing system proposed in Patent Document 1, the fluid retention layer can be

[0009] The connecting tube is connected to the sensor. When the fluid flows into the fluid retention layer, it passes through the connecting tube to form

[0010] The pressure in the pressure chamber inside the sensor housing increases. This pressure change can be detected by the pressure sensor.

[0011] The sensed pressure data is measured by the device, using the reply signal from the passive IC tag.

[0012] The wave is obtained by the communication device, which is conducive to conveniently confirming the fluid leakage and reliably

[0013] Senses fluid leaks.

[0014] The pressure chamber contains the pressure sensor and IC tag, so the radio waves are transmitted through the housing.

[0015] The radio wave transmission part covers the upper side of the pressure chamber.

[0016] The hose is exposed and arranged in a state of protruding from the surface of the ship hose.

[0017] When in the sea or when being recovered on board, or when using a ship hose in the sea, radio waves can penetrate

[0018] On the other hand, if the radio waves pass through

[0019] If the upper periphery of the sensor is simply protected by a metal cover, the excellent radio wave communication will be impaired. In addition, there is a risk of damage to objects that come into contact with the metal cover. Therefore, there is room for improvement in ensuring a good wireless communication state with the sensor while improving the durability of the sensor and reducing the risk of damage to both parties caused by contact between the sensor and the object.

[0020] Prior art literature

[0021] Patent Literature

[0022] Patent Document 1: Japanese Patent Application Publication No. 2021-46929 Summary of the invention

[0023] Problems to be solved by the invention

[0024] The object of the present invention is to provide a fluid leakage sensing system of a shell and a top cover assembly and a ship hose having the assembly, which can improve the durability of the sensor and reduce the risk of damage to both parties caused by contact between the sensor and the object, while ensuring good wireless communication with the sensor.

[0025] Technical means of solving problems

[0026] In order to achieve the above-mentioned purpose, the assembly of a shell and a top cover for a fluid leakage sensor of a ship hose of the present invention is an assembly of a shell for a fluid leakage sensor which is arranged on the surface of the ship hose and is communicatively connected to a fluid retention layer formed on the ship hose, and a top cover fixed to the shell, characterized in that the shell is constructed as follows, namely, it has: a metal cylindrical base; a radio wave transmission part which watertightly isolates the upper end side of the base; and three or more metal protrusions which protrude upward from the base more than the radio wave transmission part, a pressure retaining chamber is formed by being surrounded by the base and the radio wave transmission part, and when viewed from above, each of the protrusions is arranged at intervals in the circumferential direction on the radio wave transmission part. The top cover is located at the outer peripheral side of the part, and the upper ends of each of the protrusions are separated from each other. A pressure sensor part and a passive IC tag connected to the pressure sensor part are accommodated in the pressure maintaining chamber. The top cover is a resin or rubber annular body that continuously covers the upper ends of each of the protrusions in the circumferential direction when viewed from above, and is formed with a locking portion that is engaged with the upper ends of each of the protrusions. When the locking portion is engaged with the upper ends of each of the protrusions and the top cover is arranged on the upper ends of each of the protrusions and fixed to the shell, an area closer to the inner peripheral side than each of the protrusions and an area closer to the outer peripheral side than each of the protrusions are connected through a circumferential gap between the lower ends of the protrusions adjacent to each other in the circumferential direction.

[0027] The fluid leakage sensing system of the ship hose of the present invention is characterized in that it is configured as follows: it comprises: an assembly of a housing and a top cover for the fluid leakage sensor of the ship hose, the pressure sensor unit and the IC tag sensor housed in the pressure maintaining chamber; a connecting pipe extending on the surface of the ship hose and connecting the fluid retention layer and the sensor so as to be communicable; a check valve that only allows flow from the connecting pipe side to the pressure maintaining chamber side; and a radio wave transmitting unit and a radio wave receiving unit arranged on the outside of the ship hose, and a reply radio wave is sent from the IC tag based on the transmission radio wave sent from the radio wave transmitting unit, and the sensed pressure data measured by the pressure sensor unit is sent through the reply radio wave and received by the radio wave receiving unit.

[0028] Effects of the Invention

[0029] According to the assembly of the present invention, when viewed from above, three or more metal protrusions that protrude upwards from the radio wave transmission portion are arranged at intervals along the circumferential direction at the outer peripheral side of the radio wave transmission portion, so that the upper surface of the radio wave transmission portion can be protected by these protrusions. Therefore, it is helpful to reduce the risk of damage to the radio wave transmission portion and improve the durability of the sensor. In addition, since the protrusions are arranged at intervals along the circumferential direction and the upper ends of the protrusions are spaced from each other when viewed from above, the disadvantage that the excellent radio wave communication with the sensor is impaired due to these protrusions is avoided.

[0030] Since the upper end of each protrusion is covered by a top cover which is a resin annular body that is continuous in the circumferential direction when viewed from above, even if the upper end of each metal protrusion contacts an object, it is helpful to reduce the risk of damage to both the sensor and the object. Moreover, when the top cover is fixed to the shell, the area closer to the inner circumference than each protrusion and the area closer to the outer circumference than each protrusion are connected through the circumferential gap between the lower ends of the circumferentially adjacent protrusions, thereby reducing the force from the waves on the top cover, which is helpful to fix the top cover to the shell stably for a long time. In addition, since the top cover is an annular body, the upper surface of the radio wave transmission part will not be covered by the top cover as a whole, which can avoid the loss of the excellent radio wave communication with the sensor.

[0031] According to the fluid leakage sensing system of the present invention, the radio wave communication between the radio wave transmitting unit and the radio wave receiving unit arranged on the outside of the ship hose and the sensor (IC tag) can be well maintained for a long time. Therefore, the ease of confirming fluid leakage and the reliability of sensing can be ensured for a long time. In addition, even if an object contacts the sensor, the risk of damage to both the sensor and the object can be reduced for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is an explanatory diagram showing an example of a ship hose to which the present invention is applied.

[0033] Figure 2 This is an explanatory diagram showing an embodiment of a fluid leakage sensing system in an enlarged longitudinal cross-sectional view of a portion of a ship hose.

[0034] Figure 3 This is an example from a side view. Figure 2 Illustration of the sensor.

[0035] Figure 4 This is shown as an example from a top view. Figure 3 Illustration of the sensor.

[0036] Figure 5 So Figure 4 An explanatory diagram of the sensor is shown by way of example in the AA cross-sectional view (longitudinal cross-sectional view).

[0037] Figure 6 This is shown as an example from a top view. Figure 5 An illustration of the interior of the pressure holding chamber.

[0038] Figure 7 This is shown as an example from a top view. Figure 4 Illustration of the sensor with the top cover removed.

[0039] Figure 8 This is an example from a side view. Figure 7 An illustration of the housing.

[0040] Fig. 9 This is an example of looking up. Figure 4 Illustration of the top cover.

[0041] Fig.10 This is an example Figure 5 An illustration of the disassembled state of the sensor.

[0042] Fig.11 This is shown as an example Figure 5 An illustration of a state in which a top cover is installed on a housing.

[0043] Fig.12 This is an explanatory diagram showing, by way of example, a sensor communicating with a communication device in a longitudinal cross-sectional view.

[0044] Fig.13 This is an explanatory diagram showing a modified example of an assembly in a longitudinal cross-sectional view.

[0045] Fig.14 This is an example to show Fig.13 An illustration of a state in which the shell and the top cover are separated.

[0046] Fig.15 This is shown as an example from a top view. Fig.14 An illustration of the housing.

[0047] Fig.16 This is an example of looking up. Fig.14 Illustration of the top cover.

[0048] Fig.17 This is an explanatory diagram showing another improved example of the assembly in a longitudinal sectional view.

[0049] Fig.18 This is an example to show Fig.17 An illustration of a state in which the shell and the top cover are separated.

[0050] Fig.19 This is shown as an example from a top view. Fig.17 An illustration of the housing.

[0051] Fig. 20 This is an example of looking up. Fig.17 Illustration of the top cover.

[0052] Fig.21 This is an explanatory diagram showing an improved example of the shell from a side view.

[0053] Fig. 22 This is shown as an example from a top view. Fig.21 An illustration of the housing.

[0054] Fig.23 This is an example of using a side view. Fig.21 An illustration of a sensor having an assembly of a housing and a top cover.

[0055] Fig.24 This is shown as an example from a top view. Fig.23 Illustration of the sensor.

[0056] Fig.25 This is an explanatory diagram showing an embodiment of a fluid leakage sensing system using a drone in an enlarged longitudinal cross-sectional view of a portion of a ship hose. DETAILED DESCRIPTION

[0057] Hereinafter, an assembly of a housing and a top cover for a fluid leakage sensor for a ship hose (hereinafter referred to as an assembly 21) and a fluid leakage sensing system for a ship hose (hereinafter referred to as a sensing system) of the present invention will be described based on the embodiments shown in the drawings.

[0058] The assembly 21 and the sensing system are used to sense whether the fluid L is flowing from the Figure 1 The example of the floating ship hose 1 is leaking in the flow path 1a. The ship hose 1 has connecting end portions 2 for connecting other ship hoses 1 at both ends in the longitudinal direction. The connecting end portions 2 have a pipe nipple 2b extending in the longitudinal direction of the ship hose 1 and a flange 2a joined to one end of the pipe nipple 2b in the longitudinal direction. Generally, eight to ten ship hoses 1 are connected and used.

[0059] like Figure 2 As shown in the example, between the pipe joints 2b at both ends in the longitudinal direction of the ship hose 1, the inner surface layer 3, the inner peripheral side reinforcement layer 4, the main body layer 5, the fluid retention layer 7, the outer peripheral side reinforcement layer 6, the buoyancy layer 8, and the outer surface layer 9 are stacked in order from the inner peripheral side to the outer peripheral side of the ship hose 1 on the outer peripheral side of the flow path 1a. The inner peripheral side of the inner surface layer 3 is the flow path 1a of the fluid L. Examples of the fluid L include crude oil, heavy oil, gasoline, LPG (Liquefied Petroleum Gas), water, seawater, chemicals (alcohols obtained by refining gasoline), etc.

[0060] 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.

[0061] The inner surface layer 3 is made of a suitable material according to the type of fluid L. If the fluid L is crude oil or the like, it is made of nitrile rubber or the like with excellent oil resistance. The inner circumferential reinforcement layer 4 and the outer circumferential reinforcement layer 6 are respectively formed by laminating a plurality of reinforcement cord layers formed by rubber-coated reinforcement cords. The main wire layer 5 is formed by spirally winding metal wires at predetermined intervals on the outer circumferential rubber of the inner circumferential reinforcement layer 4. The inner circumferential reinforcement layer 4, the main wire layer 5, and the outer circumferential reinforcement layer 6 are fixed to the pipe joint 2b using the pipe joint wires 4a, 5a, 6a at one end of each and the fixing ring 2c protruding from the outer circumferential surface of the pipe joint 2b. The fluid retention layer 7 formed between the inner circumferential reinforcement layer 4 and the outer circumferential reinforcement layer 6 is a space for storing the fluid L leaked from the flow path 1a.

[0062] Figure 2 The sensor system shown as an example includes: a sensor 11; a connecting pipe 10 extending on the surface of the ship hose 1 (the outer peripheral surface of the pipe joint 2b) and connecting the fluid retention layer 7 and the sensor 11 so as to be communicable; a check valve 17; and a radio wave transmitter 24a and a radio wave receiver 24b arranged on the outside of the ship hose 1. A transmission radio wave R1 is transmitted from the radio wave transmitter 24a to the sensor 11, and a reply radio wave R2 is transmitted from the sensor 11 to the radio wave receiver 24b.

[0063] The radio wave transmitter 24a and the radio wave receiver 24b are arranged outside the ship hose 1 separately from the ship hose 1. In this embodiment, the communication machine 24 is used in which the radio wave transmitter 24a, the radio wave receiver 24b and the computing device 25 are integrated, but they can also be made into separate independent structures. As the computing device 25, a well-known computer can be used, and the communication machine 24 can be equipped with a monitor, etc.

[0064] like Figures 3 to 11 As shown in the example, the sensor 11 includes an assembly 21 composed of a housing 18 and a top cover 20 , and a pressure sensor unit 15 and a passive IC tag 12 housed in a pressure holding chamber 18 c in the housing 18 .

[0065] like Figure 5As shown in the example, in this embodiment, the sensor 11 is connected to the connecting pipe 10 via a metal cylindrical connector portion 23. In detail, the cylindrical tube end connection portion 10a located at the end of the connecting pipe 10 is screwed and connected to the connector portion 23. The connector portion 23 is connected to the base 18a of the housing 18, and the watertightness is ensured by an annular sealing material 18s (O-ring) therebetween. The interior of the connector portion 23 is a watertight introduction chamber 23a. If the connector portion 23 is not used, the base 18a is connected to the tube end connection portion 10a.

[0066] The housing 18 has: a metal cylindrical base 18a; a radio wave transmission portion 18b that watertightly isolates the upper end side of the base 18a; and three or more metal protrusions 19 that protrude upward from the radio wave transmission portion 18b. In this embodiment, the housing 18 also has an annular fixing portion 18d. The base 18a and the protrusion 19 are basically an integral body. The base 18a, the fixing portion 18d and the protrusion 19 are formed of, for example, stainless steel.

[0067] like Figure 5 , Fig.10 As shown in the example, the base 18a has a large diameter recessed portion with a radio wave transmission portion 18b and a small diameter recessed portion connected to the bottom of the large diameter recessed portion. The upper end of the check valve 17 installed at the lower end of the base 18a is exposed to the bottom surface of the small diameter recessed portion. An annular seal 18s (O-ring) is arranged inside the base 18a (bottom surface portion of the large diameter recessed portion) and on the lower surface of the base 18a. In addition, the seal 18s is appropriately arranged at a necessary position.

[0068] In this embodiment, the radio wave transmission part 18b is formed into a disk shape and has a concave portion on its lower surface. The concave portion on the lower surface of the radio wave transmission part 18b and the small diameter concave portion inside the base 18a are set to be opposite to each other up and down. The radio wave transmission part 18b is arranged on the base 18a so that its lower surface abuts against the bottom surface portion of the large diameter concave portion inside the base 18a.

[0069] Since the seal 18s is sandwiched between the lower surface of the radio wave transmission part 18b and the bottom surface of the large diameter recess inside the base 18a, the upper end side of the base 18a is watertightly blocked by the radio wave transmission part 18b. In addition, the pressure-retaining chamber 18c is formed by the base 18a and the radio wave transmission part 18b. That is, the watertight pressure-retaining chamber 18c is formed by the small diameter recess inside the base 18a and the recess on the lower surface of the radio wave transmission part 18b.

[0070] The radio wave transmitting portion 18b has a circular cutout portion on the outer edge of the upper surface when viewed from above. A circular annular fixing portion 18d is arranged on the cutout portion. The outer peripheral surface of the fixing portion 18d is screwed with the inner peripheral surface of the upper end opening of the base 18a, so that it can be freely loaded and unloaded relative to the base 18a. The radio wave transmitting portion 18b is fixed to the base 18a by the fixing portion 18d screwed on the inner peripheral surface of the upper end opening of the base 18a in a state where the outer peripheral edge portion is pressed from above. In this way, the radio wave transmitting portion 18b is fixed relative to the base 18a via the annular fixing portion 18d engaged with the outer edge portion of the radio wave transmitting portion 18b.

[0071] In order to make the transmitted radio wave R1 and the reply radio wave R2 easy to pass through, the relative dielectric constant of the radio wave transmission part 18b is set to 5.0 or less, for example, 2.0 or more and 5.0 or less, and more preferably 2.5 or more and 3.0 or less. Regarding the radio wave transmission part 18b, considering durability, impact resistance, etc., as its material, for example, polycarbonate, polyamide, epoxy resin, etc. can be used.

[0072] In addition, the radio wave transmission part 18b and the base part 18a can be of specifications that can form the pressure holding chamber 18c using the radio wave transmission part 18b and the base part 18a. In addition, other components can be used instead of the fixing part 18d, or other components can be used in addition to the fixing part 18d to fix the radio wave transmission part 18b on the base part 18a.

[0073] The protrusions 19 are arranged at intervals in the circumferential direction on the outer circumference of the radio wave transmitting portion 18b in a plan view. The protrusions 19 are preferably arranged at equal intervals in the circumferential direction of the radio wave transmitting portion 18b. For example, 3 or more and 8 or less protrusions 19 may be arranged.

[0074] In this embodiment, the protrusion 19 extending straight upward is used, but it is not limited to this shape. However, if the upper ends of the protrusions 19 are in contact (engaged) with each other, the quality of the radio wave communication between the IC tag 12 and the communication device 24 cannot be ensured. Therefore, the upper ends of the protrusions 19 are separated from each other.

[0075] The check valve 17 is provided between the pressure-maintaining chamber 18c and the introduction chamber 23a. The check valve 17 allows only the flow of the fluid L and the gas from the introduction chamber 23a side to the pressure-maintaining chamber 18c side, and restricts (blocks) the flow from the pressure-maintaining chamber 18c side to the introduction chamber 23a side. That is, the check valve 17 interposed between the connecting pipe 10 and the pressure-maintaining chamber 18c allows only the flow from the connecting pipe 10 side to the pressure-maintaining chamber 18c side, and restricts the flow from the pressure-maintaining chamber 18c side to the connecting pipe 10 side. Therefore, when the pressure P of the pressure-maintaining chamber 18c rises, the pressure state can be maintained. Various known types of check valves can be used for the check valve 17.

[0076] The IC tag 12 has an IC chip 13 and an antenna unit 14 connected to the IC chip 13. The pressure sensor unit 15 is connected to the IC tag 12 (IC chip 13). The size of the IC chip 13 is very small, for example, the longitudinal dimension and the lateral dimension are respectively less than 30 mm (less than 30 mm in terms of outer diameter), and the thickness is less than 5 mm. The size of the antenna unit 14 is also very small, for example, the longitudinal dimension and the lateral dimension are respectively less than 50 mm (less than 50 mm in terms of outer diameter), and the thickness is less than 10 mm. In this embodiment, since a ceramic antenna is used as the antenna unit 14, it becomes very compact.

[0077] A plate-shaped metal grounding portion 16 is disposed in contact with the lower surface of the antenna portion 14. Figure 5 , Figure 6 As shown in the example, in this embodiment, the grounding portion 16 is placed on the C-ring 18f, and the C-ring 18f is detachably fitted in the annular groove of the concave portion formed on the lower surface of the radio wave transmission portion 18b. In a state where the annular spacer 18e is arranged on the upper surface of the antenna portion 14, the IC tag 12 and the pressure sensor portion 15 are arranged in the pressure holding chamber 18c. It is also possible to make a structure in which the IC tag 12 and the pressure sensor portion 15 are arranged in the pressure holding chamber 18c without using the C-ring 18f. The spacer 18e can be set arbitrarily. By combining the antenna portion 14 using a ceramic antenna, the small check valve 17 that can withstand high pressure (for example, 7 to 8 MPa), and the grounding portion 16, it is very helpful to make the sensor 11 compact.

[0078] The ground portion 16 may be in contact with the metal base 18a. With this configuration, the base 18a and the protrusion 19 can actively function as antennas, making it easy to ensure excellent radio wave communication between the IC tag 12 and the communication device 24.

[0079] The pressure sensor unit 15 senses the pressure P of the pressure holding chamber 18c. The size of the pressure sensor unit 15 is about the same as that of the IC chip 13. In the drawings, the IC chip 13 and the pressure sensor unit 15 are suspended, but they may be laid flat like the antenna unit 14.

[0080] The larger the exposed area of ​​the upper surface of the radio wave transmission portion 18b is, the better it is for maintaining the radio wave communication between the IC tag 12 and the communication device 24, but the less it is for ensuring the pressure resistance of the radio wave transmission portion 18b. Figure 7As shown in the example, if the upper surface of the radio wave transmission part 18b is set to be circular, the diameter Da is set to be, for example, 40 mm or more and 70 mm or less. That is, the upper surface of the radio wave transmission part 18b is set to an exposed area corresponding to the diameter Da of 40 mm or more and 70 mm or less. The gap Db between the protrusions 19 facing each other when viewed from above is set to be 100% or more of the diameter Da. In addition, Fig.10 As shown in the example, the greater the thickness C of the upper surface of the radio wave transmission portion 18b, the more advantageous it is to ensure pressure resistance, but the less advantageous it is to maintain good radio wave communication between the IC tag 12 and the communication device 24. Therefore, the thickness C of the upper surface of the radio wave transmission portion 18b is set to, for example, 5 mm or more and 15 mm or less.

[0081] The specification, quantity, and position of the protrusion 19 are based on the premise that the radio wave transmission part 18b can be protected and the radio wave communication between the IC tag 12 and the communication device 24 can be well maintained. In order to protect the radio wave transmission part 18b by the protrusion 19, the height H and thickness of the protrusion 19 are preferably large to a certain extent, but the necessary condition is that the height H is set so that the upper end of the protrusion 19 does not protrude further upward than the flange 2a when the sensor 11 is set on the surface of the ship hose 1. In addition, if the height H and thickness of the protrusion 19 are too large, the occupied space becomes larger, so the height H of the protrusion 19 is determined in the range of, for example, 15 mm or more and 40 mm or less, and the thickness is determined in the range of, for example, 3 mm or more and 8 mm or less. The height H of the protrusion 19 is set to be 35% or more and 45% or less of the diameter Da of the upper surface of the radio wave transmission part 18b. The width of the protrusion 19 is determined so that the interval W adjacent to each other in the circumferential direction is, for example, 10 mm or more, and more preferably 15 mm or more.

[0082] The top cover 20 is an annular body (cylindrical body) that continuously covers the upper end of each protrusion 19 in the circumferential direction when viewed from above, and is formed of a known resin or rubber. The inner diameter of the top cover 20 is, for example, greater than 10 mm and less than 70 mm, and the outer diameter is, for example, greater than 70 mm and less than 110 mm. The relative dielectric constant of the top cover 20 is greater than 1.0 and less than 8.0.

[0083] As the resin forming the top cover 20, ABS, polyvinyl chloride, polycarbonate, polyimide, epoxy resin, etc. can be exemplified. The top cover 20 preferably has excellent weather resistance, and is therefore formed of a resin or rubber with excellent weather resistance, or an anti-aging agent or the like that improves weather resistance is mixed into the resin or rubber used, or a coating with excellent weather resistance is applied to the surface of the top cover 20. For example, coatings such as acrylic silicone resin, polyurethane resin, acrylic resin, and vinyl chloride can be used. In order to improve durability, reinforcing fibers (short fibers) can also be mixed into the resin or rubber to be used. As reinforcing fibers, well-known carbon fibers, glass fibers, etc. can be used.

[0084] like Fig. 9 As shown in the example, a plurality of engagement portions 20d are formed on the top cover 20 to engage with the upper end portions of the respective protrusions 19. Figure 5 As shown in the example, the engaging portion 20d engages with the upper end of the corresponding protrusion 19 and the top cover 20 is arranged on the upper end of each protrusion 19. In this embodiment, as the engaging portion 20d, a plurality of holes are used which are arranged at intervals along the circumferential direction of the top cover 20 and open on the bottom surface of the top cover 20. The holes serving as the engaging portion 20d are formed on the top cover 20 in the number and arrangement corresponding to each protrusion 19.

[0085] The top cover 20 can be made into a color that is eye-catching in the ocean (orange, etc.). Although it is also possible to apply a paint that makes the surface of the top cover 20 eye-catching, by making the top cover 20 from a material colored in an eye-catching color, it is conducive to maintaining the color for a longer time.

[0086] like Figures 3 to 5 As shown in the example, when the top cover 20 is arranged on the upper end of each protrusion 19 and fixed to the housing 18, the area closer to the inner circumference side than each protrusion 19 and the area closer to the outer circumference side than each protrusion 19 are connected through the circumferential gap between the lower ends of the circumferentially adjacent protrusions 19. That is, the top cover 20 covers the upper end of each protrusion 19, but does not cover the entire length in the height direction. The gap in the height direction between the lower end of the top cover 20 and the lower end of each protrusion 19 (the upper surface of the radio wave transmission part 18b) is 10 mm or more, for example, 10 mm or more and 30 mm or less.

[0087] There are many ways to fix the top cover 20 to the housing 18. In this embodiment, screws 22 are used. Therefore, insertion holes 20a extending in the radial direction are formed at multiple positions spaced apart in the circumferential direction on the top cover 20. Figure 4 , Fig. 9 As shown in the example, the insertion holes 20 a are formed on the outer peripheral surface of the top cover 20 so as to communicate with the respective engagement portions 20 d.

[0088] like Figure 7 , Figure 8 As shown in the example, screw holes 19a are formed on the outer peripheral surfaces of the plurality of protrusions 19. In this embodiment, the screw holes 19a are formed on all the protrusions 19, but it is sufficient as long as they are formed on the plurality of protrusions 19, and it is more preferable that the screw holes 19a are formed on three or more protrusions 19. In addition, the screw holes 22 may be of the following specifications: even if they do not penetrate the protrusion 19 in the radial direction, they extend to the middle of the outer peripheral surface to the inner peripheral surface of the protrusion 19.

[0089] When the top cover 20 is fixed to the housing 18, Fig.11 As shown in the example, the top cover 20 is moved downward from above each protrusion 19, and the upper end of each protrusion 19 is inserted into the engaging portion 20d formed on the top cover 20 and arranged at the upper end of each protrusion 19. Figures 3 to 5 As shown in the example, the screws 22 are inserted into the insertion holes 20a from the outer circumference of the top cover 20 toward the inner circumference along the radial direction. The insertion holes 20a are connected to the respective engaging portions 20d that receive and engage the front end portions of the protrusions 19. The top cover 20 is firmly fixed to the housing 18 by screwing the screws 22 into the screw holes 19a arranged opposite to the respective insertion holes 20a. In this embodiment, the screws 22 are screwed into the screw holes 19a of all the protrusions 19, but for example, the screws 22 may be screwed into the screw holes 19a of every other protrusion 19 in the circumferential direction to fix the top cover 20 to the housing 18. In addition, the heads of the screws 22 are embedded in the insertion holes 20a so as not to protrude from the outer circumferential surface of the top cover 20 to the outer circumferential side.

[0090] 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.

[0091] In order to realize the leakage confirmation operation of the fluid L, the operator needs to take a work boat or the like to approach the ship hose 1 regularly or at a necessary time. Then, the communication device 24 is operated, such as Figure 2 As shown in the example, the radio wave transmitting unit 24a transmits a transmission radio wave R1 toward the sensor 11, and the transmission radio wave R1 generates power for the IC tag 12. The IC tag 12 transmits a reply radio wave R2 by the power, and the radio wave receiving unit 24b receives the reply radio wave R2. At this time, the sensed pressure data measured by the pressure sensor unit 15 is transmitted by the reply radio wave R2, and the sensed pressure data received by the radio wave receiving unit 24b is input into the computing device 25.

[0092] That is, the IC tag 12 and the communicator 24 constitute an RFID (Radio Frequency IDentification) system. The frequency and output power of the radio waves R1 and R2 for mutual communication can be appropriately set. Since a passive IC tag 12 is used, the mutual communication distance of the radio waves R1 and R2 between the IC tag 12 and the communicator 24 is, for example, about several tens of centimeters to several meters. The frequency of the radio waves (R1, R2) used for wireless communication between the IC tag 12 and the communicator 24 is mainly in the UHF band (varies depending on the country, but is within the range of 860 MHz to 930 MHz, and in Japan it is 915 MHz to 930 MHz), and sometimes the HF band (13.56 MHz) can also be used.

[0093] The reference value Pc of the pressure P of the pressure holding chamber 18c for judging whether the fluid L has leaked from the flow path 1a is stored in the computing device 25. In order to prevent erroneous sensing, an appropriate range is grasped in advance by conducting experiments or simulations in advance in consideration of the specifications and usage conditions of the ship hose 1, and the reference value Pc is set within the appropriate range and stored in the computing device 25 in advance.

[0094] The computing device 25 compares the pressure value of the input sensed pressure data with the reference value Pc. When the fluid L does not flow into the fluid retention layer 7, the pressure P of the pressure holding chamber 18c does not change significantly, so the pressure value of the sensed pressure data is less than the reference value Pc. Therefore, the computing device 25 determines that the fluid L has not leaked from the flow path 1a, and notifies the result through the monitor display and sound.

[0095] On the other hand, if the inner surface layer 3 or the inner peripheral side reinforcing layer 4 is damaged, the fluid L will flow from the flow path 1a into the fluid retention layer 7, and then, as shown in FIG. Fig.12 As shown in the example, the fluid L passes through the connecting pipe 10, the introduction chamber 23a and the check valve 17 to increase the pressure P of the pressure holding chamber 18c. The increased pressure P is maintained by the check valve 17 and sensed by the pressure sensor unit 15. Therefore, when the radio wave R1 is transmitted from the radio wave transmitting unit 24a toward the sensor 11 during the fluid L leakage confirmation operation, the highest pressure value of the pressure P before is received by the radio wave receiving unit 24b as the sensed pressure data measured by the pressure sensor unit 15 and input into the computing device 25.

[0096] The computing device 25 compares the pressure value of the input sensed pressure data with the reference value Pc. If the pressure value of the sensed pressure data is greater than the reference value Pc, the fluid L is judged to have leaked from the flow path 1a, and the result is notified through a monitor display or sound.

[0097] This sensing system uses a passive IC tag 12, so there is no need to monitor battery consumption. In addition, the pressure in the pressure-maintaining chamber 18c is maintained by the check valve 17, and the sensed pressure data measured by the pressure sensor unit 15 received by the radio wave receiving unit 24b is used as an index, thereby making it possible to more reliably determine whether the fluid L is leaking from the flow path 1a.

[0098] In this embodiment, the presence or absence of leakage of the fluid L from the flow path 1a is automatically determined by the computing device 25. Alternatively, for example, the presence or absence of leakage of the fluid L may be determined by comparing a preset reference value Pc with the pressure value of the sensed pressure data received by the radio wave receiving unit 24b by an operator.

[0099] Other information may be stored in advance in the IC chip 13 and sent through the reply radio wave R2. For example, information such as specification information, manufacturing information, and the time when the IC tag 12 is installed on the ship hose 1 may be stored in advance in the IC chip 13, and such information may be sent to the radio wave receiving unit 24b.

[0100] If the sensor 11 is used, the upper surface of the radio wave transmission part 18b can be protected by the protrusion 19. Therefore, it is helpful to reduce the risk of damage to the radio wave transmission part 18b and improve the durability of the sensor 11. The protrusions 19 are arranged at intervals in the circumferential direction, and the upper ends of the protrusions 19 are spaced from each other when viewed from above. Therefore, the disadvantage of impairing the excellent radio wave communication between the IC tag 12 and the communication device 24 can be avoided by these protrusions 19. Therefore, it is possible to ensure the ease of confirmation of fluid leakage and the reliability of sensing while protecting the upper surface of the radio wave transmission part 18b.

[0101] In addition, since the upper end of each protrusion 19 is covered by the top cover 20, even if the upper end of each metal protrusion 19 contacts an object, it is helpful to reduce the risk of damage to both the sensor 11 and the object. For example, even if it contacts other ship hoses or ropes around the sensor 11, it is possible to reduce damage to the sensor 11 and its ship hoses or ropes. In addition, since the top cover 20 is firmly fixed to the housing 18, it will not easily fall off from the housing 18 even if it contacts an object.

[0102] When the top cover 20 is fixed to the shell 18, the area closer to the inner circumference side than each protrusion 19 and the area closer to the outer circumference side than each protrusion 19 are connected through the circumferential gap between the lower ends of the circumferentially adjacent protrusions 19, so that seawater flows in the gap. Therefore, the force from the waves on the top cover 20 is reduced, preventing the top cover 20 from falling off from the shell 18 due to the wave force, which is conducive to the long-term stable fixing of the top cover 20 on the shell 18.

[0103] In addition, since the top cover 20 is annular, the entire upper surface of the radio wave transmission portion 18b is not covered by the top cover 20. Therefore, it is possible to avoid loss of the excellent radio wave communication between the IC tag 12 and the communication device 24. The dielectric has the effect of making the hole through which the radio wave passes appear larger (the wavelength of the radio wave becomes shorter than in the air), so this effect is one of the reasons, and fixing the top cover 20 to the housing 18 may also slightly improve the radio wave communication.

[0104] exist Figures 13 to 16In the assembly 21 shown as an example, the top cover 20 is firmly fixed to the housing 18 using the protruding threaded portion 19b and the top cover threaded portion 20b. The top cover threaded portion 20b extending in the circumferential direction is formed on the top cover 20. In detail, as the engaging portion 20d, an annular groove that is continuous in the circumferential direction of the top cover 20 and opens at the bottom surface of the top cover 20 is used. The top cover threaded portion 20b extending in the circumferential direction is formed on the outer peripheral surface of the annular groove serving as the engaging portion 20d. The protruding threaded portion 19b extending in the circumferential direction is formed on the outer peripheral surface of each protrusion 19.

[0105] The top cover 20 is rotated in the circumferential direction around the central axis of the top cover 20 (each protrusion 19) when viewed from above at the upper end of each protrusion 19, so that the top cover threaded portion 20b is screwed into each protrusion threaded portion 19b. As the top cover 20 rotates, the engaging portion 20d is engaged with the upper end of each protrusion 19, and the top cover 20 gradually moves downward to be fixed to the housing 18 in a state of being arranged at the upper end of each protrusion 19.

[0106] exist Figures 17 to 20 In the assembly 21 shown as an example, the top cover 20 is firmly fixed to the housing 18 using the protrusion fitting portion 19c and the top cover fitting portion 20c. The top cover fitting portion 20c is formed on the top cover 20. In detail, as the engaging portion 20d, a plurality of holes are used which are arranged at intervals along the circumferential direction of the top cover 20 and open on the bottom surface of the top cover 20. The top cover fitting portion 20c which protrudes radially inward is formed on the outer peripheral surface of the plurality of holes as the engaging portion 20d.

[0107] A protrusion fitting portion 19c that is recessed radially inward is formed on the outer circumferential surface of the plurality of protrusions 19. The top cover 20 is pressed downward so that each fitting portion 20d is fitted with the upper end of the corresponding protrusion 19 and the top cover 20 is arranged on the upper end of each protrusion 19, thereby fitting the top cover fitting portion 20c with each protrusion fitting portion 19c and fixing the top cover 20 on the housing 18.

[0108] Alternatively, the top cover fitting portion 20c that is recessed radially outward may be used while the protruding fitting portion 19c that is protruding radially outward may be used. In addition, as the engaging portion 20d, an annular groove that is continuous along the circumference of the top cover 20 and opens on the bottom surface of the top cover 20 may be used instead of the plurality of holes that are spaced apart along the circumference.

[0109] An adhesive may be used in combination to fix the top cover 20 to the housing 18. That is, when the top cover 20 is fixed to the housing 18 using the above-mentioned methods, the top cover 20 and the front end of each protrusion 19 may be fixed using a known adhesive.

[0110] In addition, the above method of fixing the top cover 20 to the housing 18 using the screw 22 and the above method of fixing the top cover 20 to the housing 18 by screwing the protruding threaded portion 19b with the top cover threaded portion 20b can be used in combination. In addition, the above method of fixing the top cover 20 to the housing 18 using the screw 22 and the above method of fixing the top cover 20 to the housing 18 by fitting the protruding fitting portion 19c with the top cover fitting portion 20c can be used in combination.

[0111] The shape of the protrusion 19 can basically be a shape extending straight upward, but in order to improve the protection effect of the radio wave transmission part 18b, other shapes can also be adopted. Fig.21 , Fig. 22 As shown in the example, each protrusion 19 may be formed in a shape that is bent at a midway position in the vertical direction and extends toward the center of the radio wave transmitting portion 18b in a plan view.

[0112] However, the lower end of each protrusion 19 is arranged on the side closer to the outer periphery than the outer periphery of the upper surface of the radio wave transmission part 18b, and the height position of the mid-bend is set to a position more than 8mm from the upper surface of the radio wave transmission part 18b. In addition, the gap Db between the upper ends of the bends of each protrusion 19 when viewed from above is set to more than 50% of the diameter Da of the upper surface of the radio wave transmission part 18b, preferably more than 70%, and more preferably more than 100%. In addition, the gap W between the circumferentially adjacent upper ends of the bends of each protrusion 19 when viewed from above is preferably set to more than 3mm, and more preferably more than 5mm.

[0113] In use Fig.21 , Fig. 22 In the case of the housing 18, the top cover 20 can be fixed to the housing 18 in the same manner as the various top covers 20 described above. That is, the housing 18 and the top cover 20 can constitute Fig.23 , Fig.24 An assembly 21 is shown as an example.

[0114] In the sensing system of the present invention, the confirmation of fluid leakage can be performed not only by the operator holding a portable communication device 24, but also by the operator using a portable communication device 24. Fig.25 As shown in the example, the communication device 24 is mounted on the drone 27 for implementation. Fig.25 The sensing system shown as an example is different from the above-mentioned embodiment, and includes: a drone 27 equipped with a communication device 24 (radio wave transmitting unit 24a and radio wave receiving unit 24b) and a camera device 26; and a computing device 25 to which the sensed pressure data received by the radio wave receiving unit 24b and the image data acquired by the camera device 26 are input. The computing device 25 is arranged, for example, on a ship or in a remote management office.

[0115] The camera device 26 acquires image data of the ship hose 1 from the airspace above the ship hose 1. As the camera device 26, various known digital cameras for acquiring image data Mr of a still image or a moving image can be used.

[0116] The drone 27 is provided with a GNSS receiver 28, so that the position coordinates of the drone 27 can be grasped in real time through the GNSS receiver 28. The operator can move the drone 27 to the airspace above the sensor 11 (IC tag 12) based on the image data Mr obtained successively, or the drone 27 can be moved to the airspace above the sensor 11 (IC tag 12) through automatic control operation by inputting the position coordinates of the sensor 11 to the control unit of the drone 27.

[0117] In this sensing system, when performing a fluid leakage confirmation operation, the drone 27 is set to the following state: it is taken off from a measurement base such as land or a ship, and moved to the airspace above the sensor 11 (IC tag 12) arranged on the surface of the ship hose 1. In this state, wireless communication is performed between the IC tag 12 and the communication device 24, and the sensed pressure data measured by the pressure sensor unit 15 and the image data Mr acquired by the camera device 26 are input to the computing device 25.

[0118] The computing device 25 determines whether there is fluid leakage based on the sensed pressure data, and determines whether there is an abnormality on the outside of the ship hose 1 based on the image data Mr. If the drone 27 is used, the operator does not need to approach the ship hose 1 when performing the leakage confirmation operation, which can further reduce the workload. In addition, if the top cover 20 is made in a striking color such as orange in advance, it is easy to confirm the position of the sensor 11 through the image data Mr of the camera device 26, so it becomes easier to move the communication device 24 to the airspace above the sensor 11 (IC tag 12).

[0119] Description of Reference Numerals

[0120] 1: Marine hose

[0121] 1a: Flow path

[0122] 2: Connect the ends

[0123] 2a: Flange

[0124] 2b: Pipe joint

[0125] 2c: Fixed ring

[0126] 3: Inner surface layer

[0127] 4: Inner reinforcement layer

[0128] 4a: Pipe joint line

[0129] 5: Main line layer

[0130] 5a: Pipe joint line

[0131] 6: Outer peripheral reinforcement layer

[0132] 6a: Pipe joint line

[0133] 7: Fluid retention layer

[0134] 8: Buoyancy layer

[0135] 9: Outer surface layer

[0136] 10: Connecting pipe

[0137] 10a: Pipe end connection

[0138] 11: Sensor

[0139] 12: IC tag

[0140] 13: IC chip

[0141] 14: Antenna

[0142] 15: Pressure sensor unit

[0143] 16: Grounding

[0144] 17: Check valve

[0145] 18: Shell

[0146] 18a: Base

[0147] 18b: Radio wave transmission part

[0148] 18c: Pressure chamber

[0149] 18d: Fixed part

[0150] 18e: Spacer

[0151] 18f: C-shaped ring

[0152] 18s: Seals

[0153] 19: Protrusion

[0154] 19a: Screw hole

[0155] 19b: Protruding thread part

[0156] 19c: protrusion fitting part

[0157] 20: Top cover

[0158] 20a: Insertion hole

[0159] 20b: Top cover thread

[0160] 20c: Top cover fitting part

[0161] 20d: snap-fit ​​part

[0162] 21: Assembly

[0163] 22: Screws

[0164] 23: Adapter

[0165] 23a: Induction Room

[0166] 24: Communication machine

[0167] 24a: Radio wave transmitting unit

[0168] 24b: Radio wave receiving unit

[0169] 25: Computing device

[0170] 26: Camera rig

[0171] 27: Drones

[0172] 28: GNSS Receiver

Claims

1. An assembly of a housing and a top cover for a fluid leakage sensor of a ship hose, the assembly being an assembly of a housing for a fluid leakage sensor disposed on a surface of the ship hose and communicatively connected to a fluid retention layer formed on the ship hose and a top cover fixed to the housing, wherein: The shell is constructed as follows, that is, it has: a metal cylindrical base; a radio wave transmission part that watertightly isolates the upper end side of the base; and more than three metal protrusions that protrude from the base more upward than the radio wave transmission part, and a pressure holding chamber is formed by being surrounded by the base and the radio wave transmission part. When viewed from above, the protrusions are arranged at intervals along the circumferential direction at the outer peripheral side of the radio wave transmission part, and the upper ends of the protrusions are spaced from each other. A pressure sensor part and a passive IC tag connected to the pressure sensor part are accommodated in the pressure holding chamber. The top cover is a resin or rubber annular body that continuously covers the upper end of each of the protrusions in the circumferential direction when viewed from above, and is formed with an engaging portion that engages with the upper end of each of the protrusions. When the engaging portion is engaged with the upper end portion of each of the protrusions and the top cover is arranged on the upper end portion of each of the protrusions and fixed on the shell, the area closer to the inner circumference than each of the protrusions and the area closer to the outer circumference than each of the protrusions are connected through the circumferential gap between the lower ends of the protrusions adjacent to each other in the circumferential direction.

2. The assembly of a housing and a top cover for a fluid leakage sensor of a ship hose according to claim 1, wherein: Insertion holes extending in the radial direction are formed on the top cover at a plurality of positions spaced apart in the circumferential direction. Screw holes are formed on the outer peripheral surfaces of the plurality of protrusions. A screw is provided to be inserted into each of the insertion holes from the outer peripheral side toward the inner peripheral side of the top cover in a radial direction, When the engaging portion is engaged with the upper end portions of each of the protrusions and the top cover is arranged on the upper end portions of each of the protrusions, the top cover is fixed to the shell by screwing each of the screws inserted into the insertion holes at multiple positions into the screw holes arranged opposite to the insertion holes.

3. The assembly of a housing and a top cover for a fluid leakage sensor of a ship hose according to claim 1 or 2, wherein: A top cover threaded portion extending in a circumferential direction is formed on the top cover. A protruding thread portion extending in the circumferential direction is formed on the outer peripheral surface of each of the protruding portions. The top cover is rotated circumferentially at the upper end of each of the protrusions, so that the top cover threaded portion is screwed into the respective protrusion threaded portion, and the engaging portion is engaged with the upper end of each of the protrusions, thereby fixing the top cover on the shell when the top cover is arranged at the upper end of each of the protrusions.

4. The assembly of a housing and a top cover for a fluid leakage sensor of a ship hose according to claim 1 or 2, wherein: A top cover fitting portion is formed on the top cover, A protrusion fitting portion is formed on the outer peripheral surface of the plurality of protrusions, The top cover is arranged on the upper end of each protrusion by engaging the engagement portion with the upper end of each protrusion, and the top cover fitting portion is fitted with each protrusion fitting portion to fix the top cover to the housing.

5. A fluid leakage sensing system for a ship hose, comprising: an assembly of a housing and a top cover for a fluid leakage sensor for a ship hose according to any one of claims 1 to 4, a sensor having the pressure sensor unit and the IC tag housed in the pressure holding chamber; a connecting pipe extending on the surface of the ship hose and connecting the fluid retention layer and the sensor so as to be communicable; a check valve that allows only flow from the connecting pipe side to the pressure holding chamber side; and a radio wave transmitting unit and a radio wave receiving unit arranged on the outside of the ship hose, In response to the transmission radio wave transmitted from the radio wave transmitting unit, the IC tag transmits a reply radio wave, and the sensed pressure data measured by the pressure sensor unit is transmitted by the reply radio wave and received by the radio wave receiving unit.

6. The fluid leakage sensing system for a ship hose according to claim 5, comprising: an unmanned aerial vehicle equipped with the radio wave transmitting unit, the radio wave receiving unit and a camera device; and a computing device for inputting the sensed pressure data received by the radio wave receiving unit and the image data acquired by the camera device.

Images