Air layer monitoring device applicable to air layer drag reduction ship and air layer drag reduction ship

Abstract

The present invention discloses an air layer monitoring device applicable to an air layer drag reduction ship and an air layer drag reduction ship using the air layer monitoring device. The air layer monitoring device includes at least one detection part, which further includes at least one conductivity probe. The conductivity probe includes a plurality of probes. The probes respectively protrude into the air layer of the air layer drag reduction ship with different lengths, and some probes pass through the air layer, and the conductivity of the medium at different heights is measured correspondingly. According to the medium measured at the position of the probe, the single-phase air layer thickness of the current air layer detection point corresponding to the probe position is obtained. During the use of the air layer monitoring device, by measuring the conductivity of each probe and using the difference in the conductivity of water and gas, the heights of the highest probe in the gas and the lowest probe in the water are analyzed, and the air layer thickness is between the heights of the two probes. The smaller the height difference ΔH between adjacent probes, the more accurate the measurement of the air layer thickness.

Description

Technical Field

[0001] The present invention belongs to the technical field of ship air layer drag reduction, and particularly relates to an air layer monitoring device applicable to an air layer drag reduction ship and an air layer drag reduction ship. Background Art

[0002] The ship air layer drag reduction technology forms and maintains an air layer at the bottom of the ship through a specially designed device, isolating the bottom surface of the ship from water, reducing the wetted surface area, and significantly reducing the ship resistance and fuel consumption.

[0003] To reduce the power consumption of the air layer drag reduction system, during the formation of the air layer, gas needs to be quickly introduced throughout the bottom of the ship to form the air layer as soon as possible; during the maintenance of the air layer, by judging the gas spillage situation at the bottom of the ship, gas only needs to be supplemented in the area where the gas volume is insufficient.

[0004] Monitoring the properties of the air layer at the bottom of the ship is the core of this adjustment and control program. However, due to the characteristics of poor light, obvious electromagnetic and acoustic signal shielding at the bottom of the ship, it is impossible to monitor the properties of the air layer by conventional means. Summary of the Invention

[0005] To solve the above problems, the technical problem to be solved by the present invention is to provide an air layer monitoring device and an air layer drag reduction ship applicable to an air layer drag reduction ship, which are used to solve the problem that the properties of the air layer at the bottom of the ship cannot be monitored.

[0006] The technical solution of the present invention is as follows:

[0007] An air layer monitoring device applicable to an air layer drag reduction ship, comprising:

[0008] At least one detection part, which further includes at least one conductivity probe. The conductivity probe includes a plurality of probes. The probes respectively protrude into the air layer of the air layer drag reduction ship with different lengths, and part of the probes pass through the air layer, corresponding to measuring the conductivity of the medium at different heights. According to the medium measured at the position of the probe, the single-phase air layer thickness of the current air layer detection point corresponding to the position of the probe is obtained.

[0009] In the air layer monitoring device applicable to an air layer drag reduction ship of the present invention, a plurality of air layer detection points are arranged on the air layer, and the detection part is arranged at each air layer detection point.

[0010] The device further further includes a control unit. The control unit is respectively connected to the detection part, and the measured conductivity data is used to obtain the single-phase air layer thickness at the head end of the probe, and further obtain the single-phase air layer thickness of each current air layer detection point of the air layer.

[0011] The gas layer monitoring device of the present invention is applicable to a gas layer drag reduction ship, and the detection unit further includes:

[0012] An AD converter: It is connected to the probe. If the information detected by the probe is analog information, it will perform analog-to-digital conversion into digital information.

[0013] A processing unit: It is connected to the AD converter, and after performing processing calculations including desiccation on the digital information, it obtains the corresponding gas layer thickness value.

[0014] The gas layer monitoring device of the present invention is applicable to a gas layer drag reduction ship. The detection unit further includes a watertight treatment unit for performing watertight treatment on the conductivity probe, and it further includes a mounting base and a mounting cover;

[0015] The first end of the mounting base is fixedly connected to the ship bottom plate. The circumferential side of the second end of the mounting base is provided with a first external thread; a through hole is provided on the axis of the mounting base, and a first through hole adapted to the through hole is provided on the ship bottom plate; a second internal thread is provided on the hole wall of the through hole and / or the hole wall of the first through hole;

[0016] The first end of the mounting cover is provided with an inner cavity. The inner cavity wall of the mounting cover is provided with a first internal thread corresponding to the first external thread, and the mounting cover is threadedly connected to the mounting base; the first end of the mounting cover is provided with a second through hole adapted to the through hole, and the second through hole is communicated with the inner cavity;

[0017] The circumferential side of the conductivity probe is provided with a second external thread corresponding to the second internal thread. The conductivity probe sequentially passes through the second through hole, the through hole, and the first through hole, and is threadedly connected to the through hole and / or the first through hole, and the first end of the conductivity probe extends out of the ship bottom plate detection unit.

[0018] In the gas layer monitoring device of the present invention applicable to a gas layer drag reduction ship, the watertight treatment unit further includes a gasket. The gasket is arranged in the inner cavity of the mounting cover, and a third through hole corresponding to the through hole is opened on the gasket.

[0019] In the gas layer monitoring device of the present invention applicable to a gas layer drag reduction ship, the mounting base is a bolt and the mounting cover is a cap nut;

[0020] The first end of the bolt is fixedly connected to the ship bottom plate. The circumferential side of the second end of the bolt is provided with the first external thread; the through hole is provided on the axis of the bolt, and the first through hole adapted to the through hole is provided on the ship bottom plate; the second internal thread is provided on the hole wall of the through hole and / or the hole wall of the first through hole;

[0021] The first end of the cap nut is provided with an inner cavity, and the inner cavity wall of the cap nut is provided with the first internal thread corresponding to the first external thread. The cap nut is threadedly connected to the bolt; the first end of the cap nut is provided with the second through hole adapted to the through hole, and the second through hole is communicated with the inner cavity;

[0022] The circumferential side of the conductivity probe is provided with the second external thread corresponding to the second internal thread. The conductivity probe sequentially passes through the second through hole, the through hole and the first through hole, and is threadedly connected to the through hole and / or the first through hole, and the first end of the conductivity probe extends out of the ship bottom plate detection part.

[0023] The present invention is applicable to the gas layer monitoring device of an air layer drag reduction ship, and the probe length on the conductivity probe is set according to the gas layer thickness required at the gas layer detection point where the conductivity probe is located.

[0024] The present invention is applicable to the gas layer monitoring device of an air layer drag reduction ship. The control unit is used to transmit the single-phase gas layer thickness information of each current gas layer detection point of the gas layer to the control system of the air layer drag reduction ship. The control system compares the actually required gas layer thickness at each gas layer detection point to adjust the air volume size in the corresponding ventilation pipeline at the gas layer detection point, so that the gas layer thickness at the gas layer detection point reaches the specified requirement.

[0025] For the air layer drag reduction ship of the present invention, a gas layer monitoring device is arranged on the hull.

[0026] Due to the adoption of the above technical solutions, the present invention has the following advantages and positive effects compared with the prior art:

[0027] (1) At a specific gas layer detection point, the probes in the device of the present invention protrude into the gas layer with different lengths, and some of the longer probes also protrude into the liquid layer outside the gas layer, and the conductivity of the medium at the head end of the probe is detected. The liquid layer outside the gas layer is the water layer. There is an obvious difference in the conductivity between the gas and the water. By using the difference in conductivity, analyze the lengths of the longest probe in the gas and the shortest probe in the water. The gas layer thickness is between the lengths of the two probes. Thus, the gas layer thickness at the gas layer detection point where the conductivity probe is located can be obtained. During the entire process of using the air layer drag reduction technology of the air layer drag reduction ship, the thickness of the gas layer is always changing. The use of the gas layer monitoring device of the present invention can monitor the gas layer thickness at the gas layer detection point.

[0028] (2) The setting of multiple conductivity probes in the same detection unit makes the detection result more accurate. At the same time, if only one conductivity probe is set in a detection unit, it is not easy to detect when the conductivity probe has problems; if multiple conductivity probes are set in a detection unit, when one of them has problems, the value detected by it will be different from the values detected by other conductivity probes, and it can be detected in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following further describes in detail the specific embodiments of the present invention with reference to the drawings, wherein:

[0030] Figure 1 is a schematic diagram of an air layer monitoring device applicable to an air layer drag reduction ship of the present invention

[0031] Figure 2 is another schematic structural diagram of an air layer monitoring device applicable to an air layer drag reduction ship of the present invention;

[0032] Figure 3 is a partial enlarged view of the conductivity probe of the present invention;

[0033] Figure 4 is a schematic diagram of the installation position of the air layer monitoring device of the present invention at the bottom of the ship.

[0034] Description of the reference numerals in the drawings:

[0035] 1: Conductivity probe; 11: Probe; 2: Processing unit; 3: AD converter; 4: Ship bottom plate; 5: Mounting seat; 6: Mounting cover; 7: Gasket; 8: Detection unit installation position; 9: Gas supply device; 10: Cavitation at the bottom of the ship. SPECIFIC EMBODIMENTS

[0036] The following further describes in detail the air layer monitoring device and the air layer drag reduction ship applicable to the air layer drag reduction ship proposed by the present invention with reference to the drawings and specific embodiments. According to the following description and the claims, the advantages and features of the present invention will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, only for the purpose of conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0037] Embodiment 1

[0038] Refer to Figure 1 and Figure 2, this embodiment provides an air layer monitoring device applicable to an air layer drag reduction ship, which includes at least one detection part, and further includes at least one conductivity probe 1. The conductivity probe 1 includes a plurality of probes 11. The probes 11 protrude into the air layer of the air layer drag reduction ship with different lengths, and some of the probes 11 pass through the air layer. The conductivity of the medium at different heights is measured correspondingly. According to the medium at the position where the probe is located, the gas-phase flow void fraction or the single-phase air layer thickness corresponding to the current air layer detection point at the position of the probe is obtained.

[0039] Specifically, at a specific air layer detection point, a detection part is set. The probes 11 on the conductivity probe 1 in the detection part protrude into the air layer with different lengths, and some of the longer probes 11 also protrude into the liquid layer outside the air layer. The conductivity of the medium at the head end of the probe 11 is detected. The liquid layer outside the air layer is the water layer. There is an obvious difference in the conductivity between gas and water. By using the difference in conductivity, the lengths of the longest probe 11 in the gas and the shortest probe 11 in the water are analyzed. The air layer thickness is between the lengths of the two probes 11. Thus, the air layer thickness at the air layer detection point where the conductivity probe 1 is located can be obtained.

[0040] The setting of multiple conductivity probes 1 in the same detection part makes the detection result more accurate. At the same time, if only one conductivity probe 1 is set in one detection part, it is not easy to find when the conductivity probe 1 has problems; if multiple conductivity probes 1 are set in one detection part, when one of them has problems, the value detected by it will be different from the values detected by other conductivity probes 1, and it can be found in time.

[0041] Specifically, on the same conductivity probe 1, a corresponding indicator light is set for each probe 11. The conductivity at the junction of the air layer and the liquid layer is set to a set value. The conductivity measured at the head end of each probe 11 is compared with the set value. If it is greater than or equal to the set value, the corresponding indicator light lights up; if it is less than the set value, the corresponding indicator light does not light up. In this way, the air layer thickness range at the position of the conductivity probe 1 can be obtained. Specifically, for example, the lengths of the probes 11 on the same conductivity probe 1 are 1 cm, 2 cm, 3 cm, 4 cm, and 5 cm respectively. If the indicator lights corresponding to the probes 11 of 1 cm, 2 cm, and 3 cm do not light up, and the indicator lights corresponding to the probes 11 of 4 cm and 5 cm light up, then the air layer thickness at this position is greater than 3 cm and less than or equal to 4 cm.

[0042] Please refer to Figure 3 , on the same conductivity probe 1, the length difference ΔH of the probes 11 increasing in sequence is the resolution of the conductivity probe 1. For example, ΔH in the above example is 1 cm. The smaller ΔH is, the more accurate the detection of the air layer thickness is.

[0043] In this embodiment, the conductance probe 1 penetrates through the ship bottom plate 4. Therefore, the detection unit further needs to include a watertight treatment unit for performing watertight or airtight treatment on the conductance probe 1, which further includes a mounting seat 5 and a mounting cover 6.

[0044] The first end of the mounting seat 5 is fixedly connected to the ship bottom plate 4. The first end face of the mounting seat 5 is in contact with the ship bottom plate 4, and the periphery of the first end of the mounting seat 5 is hermetically welded to the ship bottom plate 4. The periphery of the second end of the mounting seat 5 is provided with a first external thread. The first end of the mounting cover 6 is provided with an inner cavity, and the inner cavity wall is provided with a first internal thread corresponding to the first external thread. The mounting cover 6 is threadedly connected to the mounting seat 5.

[0045] A through hole is provided on the axis of the mounting seat 5. A first through hole adapted to the through hole is provided on the ship bottom plate 4. The first end of the mounting cover 6 is provided with a second through hole adapted to the through hole, and the second through hole communicates with the inner cavity. A second internal thread is provided on the wall of the through hole and / or on the wall of the first through hole. A second external thread corresponding to the second internal thread is provided on the periphery of the conductance probe 1. The conductance probe 1 sequentially passes through the second through hole, the through hole and the first through hole, and the conductance probe 1 is threadedly connected to the mounting seat 5 and / or the ship bottom plate 4.

[0046] A washer 7 is arranged between the inner cavities of the mounting seat 5 and the mounting cover 6. A third through hole corresponding to the through hole is provided on the washer 7, and the washer 7 is sleeved on the conductance probe 1 through the third through hole. The first end face of the washer 7 is in contact with the second end face of the mounting seat 5, and the second end face of the washer 7 is in contact with the top face of the inner cavity of the mounting cover 6 to seal the gap between the mounting seat 5 and the mounting cover 6. During the process of screwing the mounting cover 6 onto the mounting seat 5, the mounting cover 6 pressing the washer 7 can meet the watertight and airtight requirements. This prevents water from seeping into the cabin when the air layer drag reduction system of the air layer drag reduction ship is not in use.

[0047] Certainly, in other embodiments, the mounting seat 5 can be a bolt, and the mounting cover 6 is a cap nut; the first end of the bolt is fixedly connected to the ship bottom plate 4, and the periphery of the second end of the bolt is provided with a first external thread. A through hole is provided on the axis of the bolt. A first through hole adapted to the through hole is provided on the ship bottom plate 4. A second internal thread is provided on the wall of the through hole and / or on the wall of the first through hole. The first end of the cap nut is provided with an inner cavity, and the inner cavity wall of the cap nut is provided with a first internal thread corresponding to the first external thread. The cap nut is threadedly connected to the bolt. The first end of the cap nut is provided with a second through hole adapted to the through hole, and the second through hole communicates with the inner cavity. A second external thread corresponding to the second internal thread is provided on the periphery of the conductance probe 1. The conductance probe 1 sequentially passes through the second through hole, the through hole and the first through hole, and is threadedly connected to the through hole and / or the first through hole, and the first end of the conductance probe 1 extends out of the detection part of the ship bottom plate 4. A washer 7 is arranged in the inner cavity of the cap nut to seal the gap between the cap nut and the bolt to meet the watertight or airtight requirements.

[0048] Example 2

[0049] This embodiment is a further improvement based on the gas layer monitoring device applicable to the gas layer drag reduction ship in Example 1.

[0050] Please refer to Figure 2 , in this embodiment, an AD converter 3 and a processing unit 2 are further provided on the conductivity probe 1. The input end of the AD converter 3 is electrically connected to the output end of the conductivity probe 1. The input end of the processing unit 2 is electrically connected to the output end of the AD converter 3. If the conductivity probe 1 detects and outputs analog information, the AD converter 3 converts the analog signal into digital information through analog-to-digital conversion and outputs it to the processing unit 2. The processing unit 2 performs processing calculations including drying on the digital information output by the AD converter 3 to obtain the corresponding gas layer thickness value. In this way, an indicator light can be avoided on the conductivity probe 1, and the gas layer thickness at the position where the conductivity probe 1 is located can be directly obtained at the processing unit 2, and the obtained gas layer thickness result is more intuitive and accurate.

[0051] In other embodiments, there may be other setting methods. For example, a processing box is provided in each detection part, and the AD converter 3 and the processing unit 2 are provided on the processing box.

[0052] Example 3

[0053] This embodiment is a further elaboration based on Example 1 and Example 2. The gas layer thickness obtained in both Example 1 and Example 2 is through single-point detection.

[0054] When the gas layer drag reduction ship is in operation, the gas layer is evenly distributed at the bottom of the entire hull and has a large area. If only single-point detection is carried out, the detection results of the gas layer cannot be obtained comprehensively, making the detection results inaccurate, and even unable to evaluate the state of the gas layer through single-point data.

[0055] Therefore, in this embodiment, a number of gas layer detection points are evenly distributed on the bottom of the gas layer drag reduction ship. At each gas layer detection point, the detection part detects the gas layer, and then the gas layer thickness measured by the detection parts of the whole ship is uniformly transmitted to the control unit, so that the gas layer of the whole ship can be monitored to obtain the gas layer thickness distribution of the whole ship.

[0056] Example 4

[0057] Please refer to Figure 4 , the gas layer drag reduction ship includes the gas layer monitoring device in Example 3. The gas layer drag reduction ship uses the gas layer drag reduction technology and is provided with a gas layer drag reduction system. The control unit of the gas layer monitoring device transmits the information of the gas layer thickness distribution of the whole ship to the control center of the gas layer drag reduction system.

[0058] When the air layer drag reduction system is applied to ships of different types and tonnages, the thickness of the air layer at the bottom of the ship is not the same. According to the positions of the air layer detection points distributed throughout the ship and the possible thickness range of the air layer, the number and length of the probes 11 are customized so that the height ranges of the probes 11 with different lengths can cover the change range of the air layer thickness. The minimum value of the change in the air layer thickness that can be resolved by the conductance probe 1 is the difference in the increased length ΔH of the probes 11 on the same conductance probe 1.

[0059] During the use of the air layer measuring device, by measuring the conductivity of each probe 11 and utilizing the difference in the conductivity of water and gas, the lengths of the longest probe 11 in the gas and the shortest probe 11 in the water are analyzed, and the air layer thickness is between the heights of the two probes 11. The smaller ΔH is, the more accurately the air layer thickness can be measured.

[0060] The air source and the ventilation pipeline of the air layer drag reduction ship need to be designed according to the ship type and tonnage. The purpose is to transport the gas with a specified pressure and flow rate to the specified bottom position of the ship so as to form a uniform and stable air layer at the bottom of the ship. The ventilation pipeline is generally divided into multiple branch pipelines, and electric control valves are installed on the pipelines, which can remotely adjust the opening degree and the flow rate of the branch pipelines.

[0061] When the air layer thickness measured by the air layer monitoring device in a certain area is less than the required air layer thickness, the measurement data is fed back to the control center. After the system analyzes the amount of gas that needs to be increased in this area, the electric control valve of the corresponding branch pipe in this area is automatically adjusted to increase the gas supply in this area so that the air layer thickness meets the specified requirements.

[0062] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, provided that these changes fall within the scope of the claims of the present invention and its equivalent technologies, they still fall within the protection scope of the present invention.

Claims

1. An air layer monitoring device applicable to an air layer drag reduction ship, characterized in that Comprising: At least one detection unit, which further includes at least one conductivity probe. The conductivity probe includes a plurality of probes. The probes respectively protrude into the air layer of the air layer drag reduction ship with different lengths, and part of the probes pass through the air layer, and the conductivity of the medium at different heights is measured correspondingly. According to the medium at the position where the probe is located, the single-phase air layer thickness corresponding to the current air layer detection point at the position where the probe is located is obtained. The detection unit further includes a watertight treatment unit for performing watertight treatment on the conductivity probe, and it further includes a mounting seat and a mounting cover. The first end of the mounting seat is fixedly connected to the ship bottom plate. The circumferential side of the second end of the mounting seat is provided with a first external thread. A through hole is provided on the axis of the mounting seat, and a first through hole adapted to the through hole is provided on the ship bottom plate. A second internal thread is provided on the hole wall of the through hole and / or the hole wall of the first through hole. The first end of the mounting cover is provided with an inner cavity. The inner cavity wall of the mounting cover is provided with a first internal thread corresponding to the first external thread. The mounting cover is threadedly connected to the mounting seat. The first end of the mounting cover is provided with a second through hole adapted to the through hole, and the second through hole communicates with the inner cavity. The circumferential side of the conductivity probe is provided with a second external thread corresponding to the second internal thread. The conductivity probe sequentially passes through the second through hole, the through hole and the first through hole, and is threadedly connected to the through hole and / or the first through hole, and the first end of the conductivity probe extends out of the ship bottom plate detection unit. The detection unit further includes an AD converter and a processing unit. The AD converter is connected to the probe. If the information detected by the probe is analog information, it is converted into digital information through analog-to-digital conversion. The processing unit is connected to the AD converter, and after processing and calculating the digital information including desiccation, the corresponding air layer thickness value is obtained.

2. The air layer monitoring device according to claim 1, wherein A plurality of air layer detection points are arranged on the air layer, and the detection unit is arranged at each air layer detection point. The device further includes a control unit. The control unit is respectively connected to the detection unit, and the measured conductivity data is used to obtain the single-phase air layer thickness at the head end of the probe, and further obtain the single-phase air layer thickness of each current air layer detection point of the air layer.

3. The air layer monitoring device applicable to an air layer drag reduction ship according to claim 1 or 2, characterized in that, The watertight treatment unit further includes a gasket. The gasket is arranged in the inner cavity of the mounting cover, and a third through hole corresponding to the through hole is provided on the gasket.

4. The air layer monitoring device applicable to an air layer drag reduction ship according to claim 1 or 2, characterized in that, The mounting seat is a bolt, and the mounting cover is a cap nut. The first end of the bolt is fixedly connected to the ship bottom plate. The circumferential side of the second end of the bolt is provided with the first external thread. A through hole is provided on the axis of the bolt, and a first through hole adapted to the through hole is provided on the ship bottom plate. A second internal thread is provided on the hole wall of the through hole and / or the hole wall of the first through hole. The first end of the cap nut is provided with an inner cavity, and the inner cavity wall of the cap nut is provided with the first internal thread corresponding to the first external thread. The cap nut is threadedly connected to the bolt; the first end of the cap nut is provided with the second through hole adapted to the through hole, and the second through hole is communicated with the inner cavity; The circumferential side of the conductivity probe is provided with the second external thread corresponding to the second internal thread. The conductivity probe sequentially passes through the second through hole, the through hole and the first through hole, and is threadedly connected to the through hole and / or the first through hole, and the first end of the conductivity probe extends out of the ship bottom plate detection part.

5. The air layer monitoring device applicable to an air layer drag reduction ship according to claim 1, characterized in that, The probe length on the conductivity probe is set according to the gas layer thickness required at the gas layer detection point where the conductivity probe is located.

6. The air layer monitoring device applicable to an air layer drag reduction ship according to claim 2, characterized in that, The control unit is configured to transmit the single-phase gas layer thickness information of each current gas layer detection point of the gas layer to the control system of the gas layer drag reduction ship. The control system compares the actually required gas layer thickness at each gas layer detection point to adjust the air volume in the corresponding ventilation pipeline at the gas layer detection point, so that the gas layer thickness at the gas layer detection point reaches the specified requirement.

7. An air layer drag reduction ship, characterized in that, A plurality of gas layer monitoring devices as described in any one of claims 1-6 are provided on the hull.

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