Assembly of a housing and a cap for a fluid leakage sensor for a marine hose and a fluid leakage sensing system for a marine hose

Abstract

The present application provides a kind of shell and top cover assembly capable of improving the durability of sensor, reducing the damage risk of both caused by the contact of sensor and object, and ensuring good wireless communication state with sensor, and the fluid leakage sensing system of marine hose with the assembly.The shell (18) in which pressure sensor part (15) and IC tag (12) are housed in pressure maintaining chamber (18c) formed by base (18a) and wave transmitting part (18b) is made to protrude (3) or more metal protruding parts (19) from base (18a) more upward than wave transmitting part (18b) at the position of outer peripheral side of wave transmitting part (18b) when viewed from top in the state that annular top cover (20) made of resin or rubber covering the upper end of each protruding part (19) continuously in circumferential direction when viewed from top is fixed on shell (18), the inner peripheral side area and outer peripheral side area of each protruding part (19) are communicated through the gap of lower end of adjacent protruding parts (19) in circumferential direction.

Description

TECHNICAL FIELD

[0001] The present application relates to an assembly of a case and a cap for a fluid leakage sensor of a marine hose

[0002] and a fluid leakage sensing system of a marine hose, and more particularly to an assembly of a case and a cap capable of improving durability of a sensor and reducing damage risks of both the sensor and an object caused by contact of the sensor with the object while ensuring a good wireless communication state with the sensor and a fluid leakage sensing system of a marine hose provided with the assembly.

[0003]

[0004] BACKGROUND

[0005] In a marine hose, by providing a fluid retention layer between reinforcing layers, leaked fluid is temporarily stored in the fluid retention layer, thereby preventing it from leaking outside the hose. In order to sense a case where fluid leaks into the fluid retention layer, various fluid leakage sensing systems have been proposed (for example, refer to Patent Document 1).

[0006]

[0007] In the fluid leakage sensing system proposed in Patent Document 1, the fluid retention layer is communicable with the sensor via a communication pipe. When fluid flows into the fluid retention layer, the pressure of a pressure maintaining chamber formed inside the case of the sensor becomes high through the communication pipe. This pressure change can be obtained by a communication device using a reply electric wave from a passive IC tag in the form of sensed pressure data measured by a pressure sensor portion, and thus it is advantageous to reliably sense fluid leakage while facilitating confirmation work of fluid leakage.

[0008]

[0009]

[0010]

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

[0017] ​​​​​​​​​​​​When at sea, when retrieved onto a ship, or during the use of marine hoses at sea, radio waves can penetrate...

[0018] The risk of damage from external forces on the affected area increases. On the other hand, if radio waves pass through...

[0019] Simply using a metal casing or similar material to protect the sensor's upper perimeter can compromise the quality of radio wave communication. Furthermore, objects that come into contact with the metal casing are at risk of damage. Therefore, there is room for improvement in ensuring good wireless communication with the sensor, while simultaneously enhancing its durability and reducing the risk of damage to both the sensor and objects from contact.

[0020] Existing technical documents

[0021] Patent documents

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

[0023] The problem that the invention aims to solve

[0024] The purpose of this invention is to provide an assembly of a housing and a top cover that 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, and a fluid leakage sensing system for a marine hose incorporating the assembly.

[0025] Technical means to solve the problem

[0026] To achieve the above objectives, the assembly of a housing and a top cover for a fluid leakage sensor of a marine hose of the present invention is an assembly of a housing for a fluid leakage sensor disposed on the surface of the marine hose and communicatively connected to a fluid retention layer formed on the marine hose, and a top cover fixed to the housing. The housing is characterized by having: a cylindrical metal base; a radio wave transmission portion that watertightly isolates the upper end of the base; and three or more metal protrusions protruding upwards from the base beyond the radio wave transmission portion. A pressure-holding chamber is formed by the base and the radio wave transmission portion, and when viewed from above, each of the protrusions is circumferentially spaced apart in the radio wave transmission portion. At the outer periphery of the part, and with the upper ends of each of the protrusions spaced apart from each other, a pressure sensor part and a passive IC tag connected to the pressure sensor part are housed in the pressure-holding chamber. The top cover is a resin or rubber ring-shaped body that continuously covers the upper ends of each of the protrusions circumferentially when viewed from above. It has a locking part that engages with the upper ends of each of the protrusions. With the locking part engaging with the upper ends of each of the protrusions, the top cover is positioned on the upper ends of each of the protrusions and fixed to the housing. The region further inward than the protrusions and the region further outward than the protrusions are connected by the circumferential gap between the lower ends of adjacent protrusions in the circumferential direction.

[0027] The fluid leakage sensing system for marine hoses of the present invention is characterized by a configuration comprising: an assembly having a housing and a top cover for a fluid leakage sensor for a marine hose; a sensor housing a pressure sensor portion and an IC tag housed in the pressure chamber; a connecting pipe extending on the surface of the marine hose and communicatively connecting the fluid retention layer to the sensor; a check valve allowing flow only from the connecting pipe side to the pressure chamber side; and a radio wave transmitting unit and a radio wave receiving unit disposed on the outside of the marine hose, wherein a response radio wave is transmitted from the IC tag based on a transmitted radio wave transmitted from the radio wave transmitting unit, and the sensed pressure data measured by the pressure sensor portion is transmitted via the response radio wave and received by the radio wave receiving unit.

[0028] Invention Effects

[0029] According to the assembly of the present invention, when viewed from above, three or more metal protrusions protruding upwards from the radio wave transmitting portion are arranged circumferentially at intervals on the outer periphery of the radio wave transmitting portion, thus protecting the upper surface of the radio wave transmitting portion. Therefore, this reduces the risk of damage to the radio wave transmitting portion and improves the durability of the sensor. Furthermore, since the protrusions are arranged circumferentially at intervals, and the upper ends of each protrusion are spaced apart from each other when viewed from above, the disadvantage of impaired radio wave communication with the sensor due to these protrusions is avoided.

[0030] Because the upper ends of each protrusion are covered by a resin ring-shaped cap that forms a continuous ring when viewed from above, the risk of damage to both the sensor and the object is reduced even if the upper ends of the metal protrusions come into contact with an object. Furthermore, with the cap fixed to the housing, the regions further inner than the protrusions and the regions further outer than the protrusions are connected by circumferential gaps between the lower ends of adjacent protrusions. This reduces the force exerted on the cap by waves, facilitating long-term stable fixation of the cap to the housing. Additionally, because the cap is ring-shaped, the upper surface of the radio wave transmission portion is not entirely covered by the cap, preventing any impairment to the quality of radio wave communication with the sensor.

[0031] The fluid leak sensing system according to the present invention can maintain reliable radio wave communication between the radio wave transmitting and receiving parts disposed on the outside of the marine hose and the sensor (IC tag) for a long period of time. Therefore, the ease of confirming fluid leaks and the reliability of sensing can be ensured over a long period. Furthermore, even if an object comes into contact with the sensor, the risk of damage to both the sensor and the object can be reduced over a long period of time. Attached Figure Description

[0032] Figure 1 The illustration shows a marine hose to which the present invention is applied.

[0033] Figure 2 This is an explanatory diagram illustrating an implementation of a fluid leak sensing system by showing an enlarged longitudinal section of a portion of a marine hose.

[0034] Figure 3 This is an example shown from a side view. Figure 2 An explanatory diagram of the sensor.

[0035] Figure 4 This example is shown from the top view. Figure 3 An explanatory diagram of the sensor.

[0036] Figure 5 Therefore Figure 4 An example illustration of the sensor is shown in the AA section view (longitudinal section view).

[0037] Figure 6 This example is shown from the top view. Figure 5 An explanatory diagram of the interior of the pressure-holding chamber.

[0038] Figure 7 This example is shown from the top view. Figure 4 An explanatory diagram of the sensor after removing the top cover.

[0039] Figure 8 This is an example shown from a side view. Figure 7 An explanatory diagram of the casing.

[0040] Figure 9 This example is shown from a downward perspective. Figure 4 Explanation diagram of the top cover.

[0041] Figure 10 This is an example. Figure 5 A diagram illustrating the disintegration state of the sensor.

[0042] Figure 11 This is an example shown in Figure 5 An illustrative diagram showing the state of the top cover being installed on the casing.

[0043] Figure 12 This is an explanatory diagram illustrating a sensor communicating with a communication device, shown from a longitudinal cross-sectional perspective.

[0044] Figure 13 This is an explanatory diagram showing an improved example of the assembly from a longitudinal sectional view.

[0045] Figure 14 This is an example to illustrate that... Figure 13 An illustration showing the shell and top cover separated.

[0046] Figure 15 This example is shown from the top view. Figure 14 An explanatory diagram of the casing.

[0047] Figure 16 This example is shown from a downward perspective. Figure 14 Explanation diagram of the top cover.

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

[0049] Figure 18 This is an example to illustrate that... Figure 17 An illustration showing the shell and top cover separated.

[0050] Figure 19 This example is shown from the top view. Figure 17 An explanatory diagram of the casing.

[0051] Figure 20 This example is shown from a downward perspective. Figure 17 Explanation diagram of the top cover.

[0052] Figure 21 This is an explanatory diagram illustrating an improved example of the housing from a side view.

[0053] Figure 22 This example is shown from the top view. Figure 21 An explanatory diagram of the casing.

[0054] Figure 23 The example shown is from a side view. Figure 21 An explanatory diagram of the sensor in the assembly of the housing and top cover.

[0055] Figure 24 This example is shown from the top view. Figure 23 An explanatory diagram of the sensor.

[0056] Figure 25 This is an explanatory diagram illustrating an implementation of a fluid leak sensing system using a drone, shown as an example of an enlarged longitudinal section of a portion of a ship's hose. Detailed Implementation

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

[0058] Assembly 21 and sensing system are used to sense the presence or absence of fluid L from Figure 1 A leak is observed in the flow path 1a of the floating marine hose 1, as illustrated in the example. The marine hose 1 has connecting ends 2 at both ends along its length for connecting to other marine hoses 1. Each connecting end 2 has a fitting 2b extending along the length of the marine hose 1, and a flange 2a engaging one end of the fitting 2b along its length. Generally, approximately eight to ten marine hoses 1 are connected together for use.

[0059] like Figure 2 As illustrated, between the pipe joints 2b at both ends of the marine hose 1 along its length, on the outer periphery of the flow path 1a, an inner surface layer 3, an inner periphery reinforcement layer 4, a main body layer 5, a fluid retention layer 7, an outer periphery reinforcement layer 6, a buoyancy layer 8, and an outer surface layer 9 are sequentially stacked from the inner periphery of the marine hose 1 towards the outer periphery. The inner periphery of the inner surface layer 3 forms the flow path 1a for fluid L. Examples of fluid L include crude oil, heavy oil, gasoline, LPG (Liquefied Petroleum Gas), water, seawater, and chemicals (alcohols refined from gasoline).

[0060] The buoyancy layer 8 is made of materials such as sponge rubber and polyurethane foam, which provide buoyancy for the ship's hose 1 to float at sea. The outer surface layer 9 is made of non-permeable materials such as rubber, and has visually distinctive lines and patterns on its surface.

[0061] The inner surface layer 3 is made of an appropriate material depending on the type of fluid L. If the fluid L is crude oil, it is made of nitrile rubber or similar material with excellent oil resistance. The inner peripheral reinforcing layer 4 and the outer peripheral reinforcing layer 6 are each formed by stacking multiple reinforcing cord layers made of rubber-coated reinforcing cords. The main body cord layer 5 is formed by spirally winding metal wires at specified intervals around the outer rubber of the inner peripheral reinforcing layer 4. The inner peripheral reinforcing layer 4, the main body cord layer 5, and the outer peripheral reinforcing layer 6 are fixed to the pipe joint 2b using pipe joint lines 4a, 5a, and 6a at one end of each and a fixing ring 2c protruding from the outer peripheral surface of the pipe joint 2b. The fluid retention layer 7 formed between the inner peripheral reinforcing layer 4 and the outer peripheral reinforcing layer 6 is a space for storing the fluid L that leaks out from the flow path 1a.

[0062] Figure 2 The example sensing system includes: a sensor 11; a connecting pipe 10 extending on the surface of the marine hose 1 (the outer peripheral surface of the pipe fitting 2b) and communicatively connecting the fluid retention layer 7 to the sensor 11; a check valve 17; and a radio wave transmitting section 24a and a radio wave receiving section 24b disposed on the outside of the marine hose 1. A transmitted radio wave R1 is transmitted from the radio wave transmitting section 24a to the sensor 11, and a returned radio wave R2 is transmitted from the sensor 11 to the radio wave receiving section 24b.

[0063] The radio wave transmitter 24a and the radio wave receiver 24b are disposed separately from the ship's flexible hose 1 on the outside of the hose 1. In this embodiment, a communication device 24 is used that integrates the radio wave transmitter 24a, the radio wave receiver 24b, and the computing device 25, but they can also be manufactured as separate and independent components. A known computer can be used as the computing device 25, and a monitor can be attached to the communication device 24, for example.

[0064] like Figures 3 to 11 As illustrated by example, the sensor 11 has: an assembly 21 consisting of a housing 18 and a top cover 20; and a pressure sensor section 15 and a passive IC tag 12 housed in a pressure chamber 18c inside the housing 18.

[0065] like Figure 5As illustrated in this embodiment, the sensor 11 is connected to the connecting pipe 10 via a metal cylindrical connector portion 23. Specifically, the cylindrical pipe end connector 10a located at the end of the connecting pipe 10 is screwed into the connector portion 23. This connector portion 23 is connected to the base 18a of the housing 18, and watertightness is ensured between them by an annular sealing material 18s (O-rings). The interior of the connector portion 23 is a watertight inlet chamber 23a. If the connector portion 23 is not used, the base 18a is connected to the pipe end connector 10a.

[0066] The housing 18 has: a cylindrical metal base 18a; a radio wave transmitting portion 18b that watertightly blocks the upper end of the base 18a; and three or more metal protrusions 19 that protrude upwards from the radio wave transmitting portion 18b. In this embodiment, the housing 18 also has an annular fixing portion 18d. The base 18a and the protrusions 19 are essentially a single unit. The base 18a, the fixing portion 18d, and the protrusions 19 are formed, for example, of stainless steel.

[0067] like Figure 5 , Figure 10 As illustrated, the base 18a has a large-diameter recess with an electromagnetic wave transmission portion 18b disposed therein, and a small-diameter recess connected to the lower part of the large-diameter recess. The upper end of the check valve 17, mounted on the lower end of the base 18a, protrudes from the bottom surface of the small-diameter recess. Circular seals 18s (O-rings) are disposed inside the base 18a (the bottom surface portion of the large-diameter recess) and on the lower surface of the base 18a. Furthermore, the seals 18s are appropriately positioned where necessary.

[0068] In this embodiment, the radio wave transmitting portion 18b is formed in the shape of a disk, and has a recess on its lower surface. The recess on the lower surface of the radio wave transmitting portion 18b and the small-diameter recess inside the base 18a are arranged to be vertically opposite each other. The lower surface of the radio wave transmitting portion 18b abuts against the bottom surface of the large-diameter recess inside the base 18a and is disposed on the base 18a.

[0069] Since the seal 18s is sandwiched between the lower surface of the radio wave transmitting portion 18b and the bottom portion of the large-diameter recess inside the base 18a, the upper end of the base 18a is watertightly isolated by the radio wave transmitting portion 18b. Furthermore, the pressure-holding chamber 18c is formed by the base 18a and the radio wave transmitting portion 18b. That is, the watertight pressure-holding chamber 18c is formed by the small-diameter recess inside the base 18a and the recess on the lower surface of the radio wave transmitting portion 18b.

[0070] The radio wave transmitting portion 18b has a circular cutout on its outer edge when viewed from above. An annular fixing portion 18d is disposed in this cutout. The outer peripheral surface of the fixing portion 18d engages with the inner peripheral surface of the upper opening of the base 18a, allowing it to be freely attached and detached from the base 18a. The radio wave transmitting portion 18b is fixed to the base 18a by the fixing portion 18d, which is screwed onto the inner peripheral surface of the upper opening of the base 18a, in a state where it is pressed into the outer peripheral edge from above. Thus, the radio wave transmitting portion 18b is fixed to the base 18a by the annular fixing portion 18d engaging with the outer edge of the radio wave transmitting portion 18b.

[0071] To facilitate the transmission of transmitted radio waves R1 and returned radio waves R2, the relative permittivity of the radio wave transmitting portion 18b is set to 5.0 or less, for example, to 2.0 or more and 5.0 or less, and more preferably to 2.5 or more and 3.0 or less. Regarding the radio wave transmitting portion 18b, considering durability, impact resistance, etc., materials such as polycarbonate, polyamide, and epoxy resin can be used as its material.

[0072] Furthermore, the radio wave transmitting portion 18b and the base 18a can be configured to form the pressure-holding chamber 18c. Additionally, other components can be used instead of the fixing portion 18d, or other components can be used besides the fixing portion 18d to fix the radio wave transmitting portion 18b to the base 18a.

[0073] When viewed from above, each protrusion 19 is arranged at intervals along the circumference on the outer periphery of the radio wave transmitting portion 18b. Each protrusion 19 is preferably arranged at equal intervals along the circumference of the radio wave transmitting portion 18b; for example, three or more but eight or fewer protrusions 19 may be arranged.

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

[0075] A check valve 17 is disposed between the pressure holding chamber 18c and the inlet chamber 23a. The check valve 17 allows only the flow of fluid L and gas from the inlet chamber 23a side to the pressure holding chamber 18c side, and restricts (isolates) the flow from the pressure holding chamber 18c side to the inlet chamber 23a side. That is, the check valve 17, sandwiched between the connecting pipe 10 and the pressure holding chamber 18c, allows only the flow from the connecting pipe 10 side to the pressure holding chamber 18c side, and restricts the flow from the pressure holding chamber 18c side to the connecting pipe 10 side. Therefore, when the pressure P in the pressure holding chamber 18c rises, this pressure state can be maintained. Various known types of check valves can be used.

[0076] The IC tag 12 includes an IC chip 13 and an antenna section 14 connected to the IC chip 13. A pressure sensor section 15 is connected to the IC tag 12 (IC chip 13). The IC chip 13 is very small, for example, with a vertical dimension and a horizontal dimension of 30 mm or less (30 mm or less in terms of outer diameter), and a thickness of 5 mm or less. The antenna section 14 is also very small, for example, with a vertical dimension and a horizontal dimension of 50 mm or less (50 mm or less in terms of outer diameter), and a thickness of 10 mm or less. In this embodiment, because a ceramic antenna is used as the antenna section 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. For example... Figure 5 , Figure 6 As illustrated in this embodiment, a grounding portion 16 is mounted on a C-ring 18f, which is detachably fitted into an annular groove in a recess formed on the lower surface of the radio wave transmitting portion 18b. With an annular spacer 18e disposed on the upper surface of the antenna portion 14, the IC tag 12 and the pressure sensor portion 15 are disposed in the pressure holding chamber 18c. Alternatively, the IC tag 12 and the pressure sensor portion 15 can be disposed in the pressure holding chamber 18c without using the C-ring 18f. The spacer 18e can be arbitrarily positioned. Combining the antenna portion 14, which employs a ceramic antenna, the small check valve 17 capable of withstanding high pressure (e.g., 7–8 MPa), and the grounding portion 16 greatly facilitates the compact design of the sensor 11.

[0078] Alternatively, it can be configured such that the grounding portion 16 contacts the metal base 18a. If configured in this way, the base 18a and the protrusion 19 can actively function as an antenna, thus easily ensuring excellent radio wave communication between the IC tag 12 and the communicator 24.

[0079] The pressure sensor unit 15 senses the pressure P in the pressure holding chamber 18c. The size of the pressure sensor unit 15 is the same as that of the IC chip 13. In the accompanying drawings, the IC chip 13 and the pressure sensor unit 15 are in a suspended state, but they can also be made in a flat state like the antenna unit 14.

[0080] A larger exposed area on the upper surface of the radio wave transmitting portion 18b is more conducive to maintaining good radio wave communication between the IC tag 12 and the communicator 24, but less conducive to ensuring the pressure resistance of the radio wave transmitting portion 18b. Therefore, as Figure 7As illustrated in the example, if the upper surface of the radio wave transmitting portion 18b is circular, then the diameter Da is set to, for example, 40 mm or more and 70 mm or less. That is, the upper surface of the radio wave transmitting portion 18b is set to have an exposed area with a diameter Da equivalent to 40 mm or more and 70 mm or less. The gap Db between the opposing protrusions 19 when viewed from above is set to 100% or more of the diameter Da. Furthermore, as... Figure 10 As illustrated in the example, a greater thickness C of the upper surface of the radio wave transmitting portion 18b is more conducive to ensuring pressure resistance, but less conducive to maintaining good radio wave communication between the IC tag 12 and the communicator 24. Therefore, the thickness C of the upper surface of the radio wave transmitting portion 18b is set to, for example, 5 mm or more and 15 mm or less.

[0081] The specifications, number, and position of the protrusions 19 are based on the premise of protecting the radio wave transmitting portion 18b and maintaining good radio wave communication between the IC tag 12 and the communicator 24. To protect the radio wave transmitting portion 18b by means of the protrusions 19, the height H and thickness of the protrusions 19 are preferably large to a certain extent, but it is necessary that the height H is set such that, when the sensor 11 is mounted on the surface of the marine hose 1, the upper end of the protrusion 19 does not protrude further upward than the flange 2a. Furthermore, if the height H and thickness of the protrusions 19 are too large, the space occupied will increase; therefore, the height H of the protrusions 19 is determined to be, for example, 15 mm or more and 40 mm or less, and the thickness is determined to be, for example, 3 mm or more and 8 mm or less. The height H of the protrusions 19 is set to be 35% or more and 45% or less of the diameter Da of the upper surface of the radio wave transmitting portion 18b. The width of the protrusions 19 is determined such that the circumferential spacing W between adjacent protrusions is, for example, 10 mm or more, more preferably 15 mm or more.

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

[0083] Examples of resins used to form the top cover 20 include ABS, polyvinyl chloride, polycarbonate, polyimide, and epoxy resin. The top cover 20 preferably has excellent weather resistance; therefore, it is formed from a resin or rubber with excellent weather resistance. Alternatively, an anti-aging agent that improves weather resistance can be added to the resin or rubber used, or a coating with excellent weather resistance can be applied to the surface of the top cover 20. For example, acrylic silicone resin, polyurethane resin, acrylic resin, and vinyl chloride-based coatings can be used. To improve durability, reinforcing fibers (short fibers) can also be mixed into the resin or rubber to be used. Known reinforcing fibers such as carbon fiber and glass fiber can be used.

[0084] like Figure 9 As illustrated by an example, a plurality of engaging portions 20d are formed on the top cover 20 that engage with the upper ends of the respective protrusions 19. For example... Figure 5 As illustrated in the example, the engaging portion 20d engages with the upper end of the corresponding protrusion 19 to position the top cover 20 on the upper end of each protrusion 19. In this embodiment, the engaging portion 20d comprises a plurality of holes spaced apart circumferentially along the top cover 20 and opening on the bottom surface of the top cover 20. The holes of the engaging portion 20d are formed on the top cover 20 in a number and arrangement corresponding to each protrusion 19.

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

[0086] like Figures 3 to 5 As illustrated, with the top cover 20 disposed on the upper ends of each protrusion 19 and fixed to the housing 18, the regions further inner than the protrusions 19 and the regions further outer than the protrusions 19 are connected by the circumferential gap between the lower ends of adjacent protrusions 19 in the circumferential direction. That is, the top cover 20 covers the upper ends 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 transmitting portion 18b) is 10 mm or more, for example, 10 mm or more and 30 mm or less.

[0087] There are various methods for securing the top cover 20 to the housing 18; in this embodiment, screws 22 are used. Therefore, insertion holes 20a extending radially are formed at multiple circumferentially spaced locations on the top cover 20. Specifically, as... Figure 4 , Figure 9 As shown in the example, an insertion hole 20a is formed on the outer peripheral surface of the top cover 20 in a manner that communicates with each engaging part 20d.

[0088] like Figure 7 , Figure 8 As illustrated in the example, screw holes 19a are formed on the outer peripheral surfaces of the plurality of protrusions 19. In this embodiment, screw holes 19a are formed on all the protrusions 19, but it is acceptable for them to be formed on any of the plurality of protrusions 19, and more preferably, screw holes 19a are formed on three or more protrusions 19. In addition, the screw holes 19a may also be configured such that, even if they do not penetrate the protrusion 19 in the radial direction, they extend to the midway from the outer peripheral surface to the inner peripheral surface of the protrusion 19.

[0089] When fixing the top cover 20 to the housing 18, such as Figure 11 As illustrated, the top cover 20 is moved downward from above each protrusion 19, inserting the upper end of each protrusion 19 into the engaging portion 20d formed on the top cover 20, and positioning it at the upper end of each protrusion 19. Then, as... Figures 3 to 5 As illustrated, screws 22 are inserted radially from the outer periphery of the top cover 20 toward the inner periphery into insertion holes 20a, which communicate with each engaging portion 20d that receives and engages the front end of the protrusion 19. The top cover 20 is securely fixed to the housing 18 by screwing these screws 22 into screw holes 19a arranged opposite to the respective insertion holes 20a. In this embodiment, screws 22 are screwed into the screw holes 19a of all protrusions 19, but for example, screws 22 can also be screwed into the screw holes 19a of every other protrusion 19 along the circumferential direction to fix the top cover 20 to the housing 18. Furthermore, the heads of the screws 22 are positioned so that they are embedded in the insertion holes 20a and do not protrude outwards from the outer periphery of the top cover 20.

[0090] The following describes an example of a sensing step that uses this sensing system to determine whether a fluid L leak has occurred in flow path 1a.

[0091] To confirm a leak in fluid L, personnel must periodically, or at necessary times, approach the vessel's hose 1 via a work vessel. Then, the communication device 24 is activated, such as... Figure 2 As illustrated, a transmitted radio wave R1 is sent from the radio wave transmitter 24a toward the sensor 11, and this transmitted radio wave R1 is used to generate power in the IC tag 12. The IC tag 12 transmits a response radio wave R2 through this power, and the radio wave receiver 24b receives the response radio wave R2. At this time, the sensed pressure data measured by the pressure sensor unit 15 is transmitted through the response radio wave R2, and the sensed pressure data received by the radio wave receiver 24b is input into the processing unit 25.

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

[0093] The computing device 25 stores a reference value Pc for the pressure P of the pressure chamber 18c used to determine whether fluid L leakage has occurred from the flow path 1a. To prevent false sensing, experiments or simulations are conducted in advance to determine the appropriate range, taking into account the specifications and operating conditions of the marine hose 1. The reference value Pc is set within this appropriate range and stored in the computing device 25 in advance.

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

[0095] On the other hand, if the inner surface layer 3 or the inner peripheral reinforcing layer 4 is damaged, the fluid L will flow from the flow path 1a into the fluid retention layer 7, and subsequently, as Figure 12 As illustrated, fluid L passes through connecting pipe 10, inlet chamber 23a, and check valve 17, causing the pressure P in pressure holding chamber 18c to rise. This increased pressure P is maintained by check valve 17 and sensed by pressure sensor unit 15. Therefore, during the fluid L leak confirmation operation, after transmitting radio wave R1 from radio wave transmitter 24a toward sensor 11, the previously highest pressure value of pressure P will be received by radio wave receiver 24b as sensed pressure data measured by pressure sensor unit 15 and input into computing device 25.

[0096] The processing unit 25 compares the pressure value of the input sensed pressure data with a reference value Pc. As a result, if the pressure value of the sensed pressure data is higher than the reference value Pc, it is determined that fluid L is leaking from flow path 1a, and the result is notified by display and sound on the monitor.

[0097] The sensing system uses a passive IC tag 12, thus eliminating the need to monitor battery consumption. Furthermore, by maintaining the pressure in the pressure chamber 18c using a check valve 17 and using the pressure data received by the radio wave receiver 24b and measured by the pressure sensor 15 as an indicator, it is possible to more reliably determine whether fluid L is leaking from the flow path 1a.

[0098] In this embodiment, the arithmetic unit 25 automatically determines whether fluid L is leaking from the flow path 1a. Alternatively, for example, the operator can compare a preset reference value Pc with the pressure value of the sensed pressure data received by the radio wave receiver 24b to determine whether fluid L is leaking.

[0099] Other information can also be pre-stored in the IC chip 13 and transmitted via the reply radio wave R2. For example, information such as the specifications of the marine hose 1, manufacturing information, and the installation time of the IC tag 12 on the marine hose 1 can be pre-stored in the IC chip 13 and transmitted to the radio wave receiving unit 24b.

[0100] Using the sensor 11, the upper surface of the radio wave transmitting portion 18b can be protected by the aforementioned protrusions 19. Therefore, it is advantageous to reduce the risk of damage to the radio wave transmitting portion 18b and improve the durability of the sensor 11. The protrusions 19 are arranged circumferentially at intervals, and when viewed from above, the upper ends of each protrusion 19 are spaced apart from each other. Therefore, these protrusions 19 can prevent the disadvantage of impaired radio wave communication between the IC tag 12 and the communicator 24. Thus, it is possible to protect the upper surface of the radio wave transmitting portion 18b while ensuring ease of fluid leakage detection and reliable sensing.

[0101] Furthermore, since the upper ends of each protrusion 19 are covered by the top cover 20, even if the upper ends of the metal protrusions 19 come into contact with an object, the risk of damage to both the sensor 11 and the object is reduced. For example, even if the sensor 11 comes into contact with other marine hoses or ropes present around it, damage to the sensor 11 and its marine hoses or ropes can be mitigated. In addition, since the top cover 20 is firmly fixed to the housing 18, it will not easily detach from the housing 18 even if it comes into contact with an object.

[0102] With the top cover 20 fixed to the housing 18, the regions further inner than the individual protrusions 19 and the regions further outer than the individual protrusions 19 are connected by a circumferential gap between the lower ends of adjacent protrusions 19, allowing seawater to flow through this gap. Therefore, the force from waves on the top cover 20 is reduced, preventing the top cover 20 from detaching from the housing 18 due to wave forces, thus facilitating the long-term stable fixation of the top cover 20 to the housing 18.

[0103] Furthermore, since the top cover 20 is annular, the upper surface of the radio wave transmission portion 18b is not entirely covered by the top cover 20. Therefore, the quality of radio wave communication between the IC tag 12 and the communicator 24 can be prevented from being compromised. The dielectric has the effect of making the aperture through which radio waves pass appear larger (the wavelength of the radio waves becomes shorter compared to air), and this effect is one reason why fixing the top cover 20 to the housing 18 may slightly improve radio wave communication.

[0104] exist Figures 13 to 16In the example assembly 21, the top cover 20 is securely fixed to the housing 18 using a protruding threaded portion 19b and a top cover threaded portion 20b. A top cover threaded portion 20b extending circumferentially is formed on the top cover 20. Specifically, the engaging portion 20d employs an annular groove that is continuous circumferentially along the top cover 20 and opens at the bottom surface of the top cover 20. A top cover threaded portion 20b extending circumferentially is formed on the outer peripheral surface of the annular groove serving as the engaging portion 20d. A protruding threaded portion 19b extending circumferentially is formed on the outer peripheral surface of each protrusion 19.

[0105] By rotating the top cover 20 circumferentially around the central axis of the top cover 20 (each protrusion 19) when viewed from above, the threaded portion 20b of the top cover is screwed into the threaded portion 19b of each protrusion. As the top cover 20 rotates, the engaging portion 20d engages with the upper end of each protrusion 19, and the top cover 20 gradually moves downward, thus being fixed to the housing 18 in a position positioned at the upper end of each protrusion 19.

[0106] exist Figures 17 to 20 In the example assembly 21, the top cover 20 is securely fixed to the housing 18 using the protruding fitting portion 19c and the top cover fitting portion 20c. The top cover fitting portion 20c is formed on the top cover 20. Specifically, as the engaging portion 20d, it employs a plurality of holes spaced apart circumferentially along the top cover 20 and opening on the bottom surface of the top cover 20. The top cover fitting portion 20c, which is the engaging portion 20d, is formed on the outer peripheral surface of the plurality of holes, protruding inward in the radial direction.

[0107] A protruding engagement portion 19c recessed inward in the radial direction is formed on the outer peripheral surface of a plurality of protrusions 19. When the top cover 20 is pressed downward, each engagement portion 20d engages with the upper end of the corresponding protrusion 19, thereby positioning the top cover 20 on the upper end of each protrusion 19. Thus, the top cover engagement portion 20c engages with each protruding engagement portion 19c, thereby fixing the top cover 20 to the housing 18.

[0108] Alternatively, a protruding fitting portion 19c that protrudes outward in the radial direction can be used in conjunction with a top cover fitting portion 20c that is recessed outward in the radial direction. In addition, as the engaging portion 20d, an annular groove that is continuous in the circumferential direction of the top cover 20 and opens on the bottom surface of the top cover 20 can be used instead of multiple holes that are spaced apart in the circumferential direction.

[0109] To secure the top cover 20 to the housing 18, an adhesive may also be used. That is, when securing the top cover 20 to the housing 18 using the methods described above, a known adhesive may also be used to secure the top cover 20 to the front ends of each protrusion 19.

[0110] Alternatively, the top cover 20 can be fixed to the housing 18 using the method described above, which uses screws 22 to fix the top cover 20 to the housing 18, and the method described above, which uses protruding threaded portion 19b to engage with top cover threaded portion 20b to fix the top cover 20 to the housing 18. Alternatively, the top cover 20 can be fixed to the housing 18 using the method described above, which uses screws 22 to fix the top cover 20 to the housing 18, and the method described above, which uses protruding fitting portion 19c to engage with top cover fitting portion 20c to fix the top cover 20 to the housing 18.

[0111] The protrusion 19 can generally be shaped to extend straight upwards, but other shapes can be used to improve the protection of the radio wave transmission portion 18b. For example... Figure 21 , Figure 22 As illustrated by an example, each protrusion 19 may also be shaped such that it bends at a midpoint in the vertical direction and extends toward the center of the radio wave transmission portion 18b when viewed from above.

[0112] However, the lower ends of each protrusion 19 are positioned further outward than the outer periphery of the upper surface of the radio wave transmitting portion 18b, and the height of the mid-bend is set at a position at least 8 mm from the upper surface of the radio wave transmitting portion 18b. Furthermore, when viewed from above, the gap Db between the curved upper ends of each protrusion 19 is set to at least 50% of the diameter Da of the upper surface of the radio wave transmitting portion 18b, preferably at least 70%, and more preferably at least 100%. Additionally, when viewed from above, the circumferential gap W between adjacent curved upper ends of each protrusion 19 is preferably at least 3 mm, and more preferably at least 5 mm.

[0113] In use Figure 21 , Figure 22 In the case of the housing 18, the top cover 20 can also 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 form a structure. Figure 23 , Figure 24 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 a worker using a handheld portable communication device 24, but also as... Figure 25 As illustrated, the communication unit 24 is mounted on the drone 27. Figure 25 The sensing system illustrated here differs from the embodiments described above, and includes: a drone 27 equipped with a communication unit 24 (radio wave transmitter 24a and radio wave receiver 24b) and a camera device 26; and a computing unit 25 for inputting sensing pressure data received by the radio wave receiver 24b and image data acquired by the camera device 26. The computing unit 25 may be configured, for example, on a ship or in a remote management office.

[0115] The camera device 26 acquires image data of the ship's hose 1 from the airspace above the hose 1. The camera device 26 can be any known digital camera or similar device used to acquire image data Mr for still or moving images.

[0116] A GNSS receiver 28 is installed in the UAV 27, allowing the UAV 27 to be located and its coordinates monitored in real time. The operator can move the UAV 27 to the airspace above and near the sensor 11 (IC tag 12) based on successively acquired image data Mr, or the UAV 27 can be automatically moved to the airspace above and near the sensor 11 (IC tag 12) by inputting the position coordinates of the sensor 11 into the control unit of the UAV 27.

[0117] In this sensing system, when performing a fluid leak confirmation operation, the drone 27 is positioned such that it takes off from a measurement base such as land or a ship and moves to the airspace near the sensor 11 (IC tag 12) disposed on the surface of the ship's hose 1. In this state, wireless communication is conducted between the IC tag 12 and the communicator 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 unit 25.

[0118] The computing device 25 determines whether there is a fluid leak based on the sensed pressure data, and further determines whether there are any abnormalities on the exterior of the marine hose 1 based on the image data Mr. If a drone 27 is used, the operator does not need to approach the marine hose 1 during leak confirmation operations, thereby further reducing the workload. In addition, if the top cover 20 is made in a conspicuous color such as orange beforehand, the position of the sensor 11 can be easily confirmed by the image data Mr from the camera device 26, thus making it easier to move the communication device 24 to the airspace above and near the sensor 11 (IC tag 12).

[0119] Explanation of reference numerals in the attached figures

[0120] 1: Marine hoses

[0121] 1a: Flow path

[0122] 2: Connecting end

[0123] 2a: Flange

[0124] 2b: Pipe fitting

[0125] 2c: Fixing ring

[0126] 3: Inner surface layer

[0127] 4: Inner peripheral reinforcing layer

[0128] 4a: Pipe fitting line

[0129] 5: Main Line Layer

[0130] 5a: Pipe fitting line

[0131] 6: Peripheral reinforcement layer

[0132] 6a: Pipe fitting 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 Chips

[0141] 14: Antenna section

[0142] 15: Pressure Sensor Section

[0143] 16: Grounding part

[0144] 17: Check valve

[0145] 18: Shell

[0146] 18a: Base

[0147] 18b: Radio wave transmission section

[0148] 18c: Pressure holding 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 threaded portion

[0156] 19c: Protruding interlocking part

[0157] 20: Top Cover

[0158] 20a: Insertion hole

[0159] 20b: Top cover threaded section

[0160] 20c: Top cover fitting part

[0161] 20d: Card-fitting part

[0162] 21: Assembly

[0163] 22: Screw

[0164] 23: Connector section

[0165] 23a: Induction Room

[0166] 24: Communication equipment

[0167] 24a: Radio wave transmitting unit

[0168] 24b: Radio wave receiving unit

[0169] 25: Computing device

[0170] 26: Camera device

[0171] 27: Drones

[0172] 28: GNSS receiver

Claims

1. An assembly of a housing and a top cover for a fluid leak sensor of a marine hose, the assembly comprising a housing for a fluid leak sensor disposed on the surface of the marine hose and communicatively connected to a fluid retention layer formed on the marine hose, and a top cover fixed to the housing, wherein, The housing has: a cylindrical metal base; a radio wave transmitting portion that watertightly blocks the upper end of the base; and three or more metal protrusions protruding upwards from the base beyond the radio wave transmitting portion. A pressure-holding chamber is formed by the base and the radio wave transmitting portion. When viewed from above, each of the protrusions is circumferentially spaced at a distance from the outer periphery of the radio wave transmitting portion, with the upper ends of each protrusion spaced apart from each other. A pressure sensor and a passive IC tag connected to the pressure sensor are housed within the pressure-holding chamber. The top cover is a resin or rubber ring that continuously covers the upper ends of each of the protrusions circumferentially when viewed from above. It has engaging portions that engage with the upper ends of each of the protrusions. However, the top cover does not cover the entire height length of each of the protrusions. With the top cover positioned on the upper end of each of the protrusions and fixed to the housing by engaging the engaging portion with the upper end of each of the protrusions, the region further to the inner circumference of each of the protrusions and the region further to the outer circumference of each of the protrusions are connected by the circumferential gap between the lower ends of adjacent protrusions in the circumferential direction, through which seawater flows.

2. The assembly of housing and top cover for a fluid leak sensor of a marine hose according to claim 1, wherein, On the top cover, insertion holes extending in the radial direction are formed at multiple locations spaced apart circumferentially. Screw holes are formed on the outer peripheral surface of the plurality of protrusions. The top cover has screws that are inserted radially from the outer peripheral side toward the inner peripheral side relative to each of the insertion holes. With the top cover positioned on the upper end of each of the protrusions by engaging the engaging portion with the upper end of each of the protrusions, the top cover is fixed to the housing by screwing the screws inserted into the insertion holes at multiple locations into the screw holes facing each of the insertion holes.

3. The assembly of housing and top cover for a fluid leak sensor of a marine hose according to claim 1 or 2, wherein, A circumferentially extending threaded portion is formed on the top cover. Each of the protrusions has a circumferentially extending threaded portion formed on its outer peripheral surface. By rotating the top cover circumferentially at the upper end of each of the protrusions, the threaded portion of the top cover is screwed into the threaded portion of each of the protrusions, and the engaging portion is engaged with the upper end of each of the protrusions, thereby fixing the top cover to the housing with the top cover positioned at the upper end of each of the protrusions.

4. The assembly of housing and top cover for a fluid leak sensor of a marine hose according to claim 1 or 2, wherein, A top cover fitting portion is formed on the top cover. Protrusion fitting portions are formed on the outer peripheral surfaces of the plurality of protrusions. The top cover is positioned on the upper end of each of the protrusions by engaging the engaging portion with the upper end of each of the protrusions, thereby engaging the top cover fitting portion with each of the protrusion fitting portions and fixing the top cover to the housing.

5. A fluid leakage sensing system for a marine hose, comprising: an assembly having a housing and a top cover for a fluid leakage sensor for a marine hose according to any one of claims 1 to 4, a sensor housing the pressure sensor portion and the IC tag in the pressure chamber; a connecting pipe extending on the surface of the marine hose and communicatively connecting the fluid retention layer to the sensor; a check valve allowing flow only from the connecting pipe side to the pressure chamber side; and an electromagnetic wave transmitting portion and an electromagnetic wave receiving portion disposed on the outside of the marine hose. Based on the transmitted radio wave sent from the radio wave transmitting unit, a response radio wave is sent from the IC tag, and the sensed pressure data measured by the pressure sensor unit is sent through the response radio wave and received by the radio wave receiving unit.

6. The fluid leakage sensing system for marine hoses according to claim 5, comprising: a drone 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