A vibrating membrane hydrofoil device for suppressing tank sloshing and a method for suppressing the same

Abstract

The present invention discloses a vibrating membrane hydrofoil device for suppressing the sloshing of a liquid tank and a method for suppressing the same, and belongs to the technical field of devices for ships. The vibrating membrane hydrofoil device for suppressing the sloshing of a liquid tank comprises a suppression component, one side of which is provided with a base for driving the suppression component to rotate and vibrate along its axial direction, the base is connected to the suppression component via a connecting component, the connecting component drives the suppression component to rotate and vibrate in a direction perpendicular to the axial direction, and the base is connected to the inner wall of the liquid tank via a fixing component. The vibrating membrane hydrofoil device for suppressing the sloshing of a liquid tank and a method for suppressing the same described in the present invention can solve the problem that the existing anti-roll device has a poor effect in alleviating the sloshing of the liquid tank.

Description

Technical Field

[0001] The present invention relates to the technical field of ship devices, and in particular to a vibrating membrane hydrofoil device for suppressing tank sloshing and a suppression method thereof. Background Art

[0002] The phenomenon of liquid tank sloshing is widely present in the shipping industry represented by LNG carriers. Liquid tank sloshing can cause the ship's roll resonance frequency to shift and multiple coupled roll motion amplitudes to peak, which is one of the reasons for the reduction of ship stability. At the same time, the impact pressure it brings significantly threatens the safety of the bulkhead and even the hull structure. Therefore, how to alleviate the problem of liquid tank sloshing caused by ship navigation to ensure the safety and stability of ship navigation has become an urgent need to be solved.

[0003] At present, the mainstream method for alleviating tank sloshing is to install baffles or sloshing plates in the tank, but there are the following disadvantages: baffles or sloshing plates are passive sloshing reductions, which are difficult to make targeted adjustments for complex sea conditions; baffles can only have a good sloshing reduction effect in a single direction, but the sloshing reduction effect in multiple directions is poor; baffles or sloshing plates cannot be adjusted in height after being fixed. Therefore, it is urgent to develop an efficient tank sloshing suppression technology to adapt to the complex sea conditions faced by ships during navigation. Summary of the invention

[0004] The object of the present invention is to provide a vibrating membrane hydrofoil device for suppressing tank sloshing and a method for suppressing the same, so as to solve the problem that the existing anti-rolling device has poor effect in alleviating tank sloshing.

[0005] To achieve the above-mentioned purpose, the present invention provides a vibrating membrane hydrofoil device for suppressing sloshing of a liquid tank, including a suppression component, one side of which is provided with a base for driving the suppression component to rotate and vibrate along its axial direction, the base is connected to the suppression component through a connecting component, the connecting component drives the membrane hydrofoil assembly to rotate and vibrate along a direction perpendicular to the axial direction, and the base is connected to the inner wall of the liquid tank through a fixing component.

[0006] Preferably, the fixing assembly includes a vertical plate, which is fixed on the inner wall of the liquid tank and connected by a cross beam. The vertical plates are provided with a long strip-shaped adjustment hole for fixing the base, and the height of the base is adjusted through the adjustment hole.

[0007] Preferably, the base includes a shell, a side wall of the shell is connected to the fixed component, a rotating shaft is provided on one side of the shell, the rotating shaft is rotatably connected to the shell, a first motor for driving the rotating shaft to rotate is provided inside the shell, a driver for adjusting the rotation amplitude and rotation frequency of the first motor is provided inside the shell, a controller is provided inside the shell, a sensor for detecting the sloshing condition of liquid in the liquid tank is provided on the rotating shaft, the sensor is connected to the controller, and the driver and the first motor are both connected to the controller; fixed plates connected to the connecting component are provided on both sides of the rotating shaft.

[0008] Preferably, a sleeve is provided on the outside of the rotating shaft, the sleeve is rotatably connected to the shell, the sleeve is connected to the output shaft of the first motor, a limiting block is provided on the inner surface of the sleeve, a limiting groove matched with the limiting block is provided on the outer surface of the rotating shaft, the limiting block is located in the limiting groove, and the sleeve drives the rotating shaft to rotate through the limiting block and the limiting groove.

[0009] Preferably, inclined connecting rods are provided on both sides of the shell, one end of the connecting rod is connected to the shell, and the other end of the connecting rod is connected to the fixing assembly through a locking piece.

[0010] Preferably, an inspection port is provided on the top of the shell, a cover plate for sealing the inspection port is provided on the shell, a limiting platform is provided at the inspection port, the cover plate is located on the limiting platform, a sealing gasket is provided between the cover plate and the limiting platform, an ear plate is provided on the cover plate, and the cover plate is fixedly connected to the shell through the ear plate.

[0011] Preferably, the connecting assembly includes a U-shaped hydrofoil arm, a long arm is provided at one end of the hydrofoil arm, and a short arm is provided at the other end of the hydrofoil arm, the end of the long arm is provided with a socket for inserting a fixed plate on the rotating shaft, and the socket is provided with a connecting hole for connecting the fixed plate to the long arm; the end of the short arm is provided with a mounting hole connected to the suppression assembly, and the short arm is provided with a mounting groove, and a second motor for driving the suppression assembly to rotate is provided in the mounting groove.

[0012] Preferably, the suppression assembly comprises a U-shaped mounting frame, the flexible film is arranged inside the mounting frame, a connecting shaft is arranged on the mounting frame, the connecting shaft is rotatably connected to the mounting hole, and the connecting shaft is connected to the output shaft of the second motor.

[0013] Preferably, connecting grooves for installing the film are provided on the inner surfaces on both sides of the installation frame, and connecting blocks adapted to the connecting grooves are provided on the film, the connecting blocks are located in the connecting grooves, the connecting grooves are dovetail grooves, and the connecting blocks are dovetail tenons, and a rectangular groove for installing the film is provided on the inner surface of the bottom of the installation frame.

[0014] The method for suppressing the sloshing of the liquid tank based on the vibrating membrane hydrofoil device comprises the following steps:

[0015] S1. Weld and fix the vertical plate to the inner wall of the liquid tank, adjust the position of the membrane according to the height of the liquid level in the liquid tank, and lock the upper and lower parts of the shell side wall with the vertical plate through T-bolt locking parts and adjustment holes respectively;

[0016] S2, one end of the connecting rod is fixedly connected to the housing by means of bolts, and the other end of the connecting rod is locked and connected to the vertical plate by means of a T-bolt locking member and an adjustment hole;

[0017] S3. The flow field information of the liquid surface in the liquid tank is detected by the sensor, and the information is fed back to the controller. The staff manually adjusts or automatically adjusts the rotation amplitude, rotation frequency and output power of the first motor and the second motor through the driver according to the feedback information of the controller.

[0018] The advantages and positive effects of the vibrating membrane hydrofoil device and the suppression method for suppressing tank sloshing of the present invention are:

[0019] 1. The present invention is provided with a long strip-shaped adjustment hole for fixing the base on the vertical plate, through which the height of the base can be adjusted according to the height of the liquid level, thereby meeting the need for suppressing sway of liquid levels at different heights. Inclined connecting rods are provided on both sides of the shell, and the setting of the connecting rods improves the stability of the shell fixed on the vertical plate.

[0020] 2. The present invention drives the film to vibrate along the axial direction of the rotating shaft and in a direction perpendicular to the axial direction of the rotating shaft respectively by the first motor and the second motor, thereby realizing the motion coupling of the film in two directions, thereby realizing oscillation wave absorption in the lateral and longitudinal directions, and successfully realizing simultaneous roll reduction in multiple directions, solving the problem that traditional roll reduction devices can only absorb waves in a single direction but cannot offset wave loads in multiple directions, and can better adapt to complex sea conditions during ship navigation.

[0021] 3. The flexible film of the present invention can absorb the energy generated by the sloshing liquid during the active oscillation process. At the same time, since the film significantly reduces the liquid level elevation during the vibration process, the disorder of the free liquid surface is reduced. At the same time, there is coupled motion between the film and the liquid in the liquid tank, which changes the original natural frequency of the liquid, reduces the probability of resonance, and improves the structural safety of the ship during navigation.

[0022] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of a top view of the structure of an embodiment of the present invention;

[0025] Figure 3 It is a front view structural schematic diagram of an embodiment of the present invention;

[0026] Figure 4 It is a side view structural schematic diagram of an embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of a fixing assembly according to an embodiment of the present invention;

[0028] Figure 6A schematic diagram of a three-dimensional structure of a base according to an embodiment of the present invention;

[0029] Figure 7 A schematic diagram of the internal structure of a base according to an embodiment of the present invention;

[0030] Figure 8 A schematic diagram of the cover plate structure according to an embodiment of the present invention;

[0031] Fig. 9 It is a schematic diagram of the three-dimensional structure of a connection assembly according to an embodiment of the present invention;

[0032] Fig.10 It is a schematic diagram of the three-dimensional structure of the suppression component according to an embodiment of the present invention;

[0033] Fig.11 It is a schematic diagram of the front view structure of the suppression component of an embodiment of the present invention;

[0034] Fig.12 It is a schematic diagram of the local structure of the suppression component according to an embodiment of the present invention.

[0035] Reference numerals

[0036] 1. Fixing assembly; 11. Vertical plate; 12. Crossbeam; 13. Adjusting hole; 2. Base; 21. Shell; 22. Cover plate; 23. Connecting rod; 24. Locking piece; 25. Sleeve; 26. Rotating shaft; 27. Limiting groove; 28. Fixing plate; 29. ​​First motor; 210. Driver; 211. Controller; 212. Limiting platform; 213. Ear plate; 3. Connecting assembly; 31. Hydrofoil arm; 32. Long arm; 33. Short arm; 34. Socket; 35. Connecting hole; 36. Mounting groove; 37. Second motor; 38. Mounting hole; 4. Suppression assembly; 41. Mounting frame; 42. Film; 43. Connecting shaft; 44. Connecting block; 45. Connecting groove. DETAILED DESCRIPTION

[0037] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown. A vibrating membrane hydrofoil device for suppressing sloshing of a liquid tank comprises a suppression component 4, and a base 2 is provided on one side of the suppression component 4 to drive the suppression component 4 to rotate and vibrate along its axial direction. The base 2 is connected to the suppression component 4 through a connecting component 3. The connecting component 3 drives the suppression component 4 to rotate and vibrate in a direction perpendicular to the axial direction. The connecting component 3 and the base 2 realize the composite rotation movement of the suppression component 4 in the axial direction and perpendicular to the axial direction. The base 2 is connected to the inner wall of the liquid tank through a fixing component 1.

[0040] like Figure 5 As shown. The fixing assembly 1 includes a vertical plate 11, and two vertical plates 11 are fixed to the inner wall of the liquid tank by welding. The vertical plates 11 are fixedly connected by a crossbeam 12 to improve the supporting strength of the vertical plates 11. The vertical plates 11 are provided with a long strip adjustment hole 13 for fixing the base 2, and the height of the base 2 is adjusted through the adjustment hole 13. The height of the base 2 can be adjusted according to the height of the liquid level through the adjustment hole 13, so as to meet the sway control needs of liquid levels at different heights.

[0041] like Figure 6 , Figure 7As shown. The base 2 includes a shell 21, and the side wall of the shell 21 is connected to the adjustment hole 13 through a locking member 24. An inclined connecting rod 23 is provided on both sides of the shell 21, one end of the connecting rod 23 is fixedly connected to the shell 21 by a screw, and the other end of the connecting rod 23 is connected to the fixing assembly 1 through a locking member 24. The locking member 24 is a T-bolt, and the shell 21 and the connecting rod 23 are locked and fixed to the vertical plate 11 through the adjustment hole 13 under the action of the T-bolt and the nut. The setting of the connecting rod 23 improves the stability of the shell 21 fixed on the vertical plate 11.

[0042] A rotating shaft 26 is provided on one side of the housing 21, and a sleeve 25 is provided outside the rotating shaft 26, and the sleeve 25 is coaxially arranged with the rotating shaft 26. The sleeve 25 is connected to the housing 21 in a sealed rotational manner through a bearing and a sealing ring. The sleeve 25 is fixedly connected to the output shaft of the first motor 29, and the first motor 29 drives the sleeve 25 to rotate. A limit block is fixedly provided on the inner surface of the sleeve 25, and a limit groove 27 adapted to the limit block is provided on the outer surface of the rotating shaft 26, and the limit block is located in the limit groove 27. The sleeve 25 drives the rotating shaft 26 to rotate through the limit block and the limit groove 27.

[0043] A driver 210 for adjusting the rotation amplitude and rotation frequency of the first motor 29 is arranged inside the housing 21. A controller 211 is arranged inside the housing 21, and a sensor for detecting the sloshing condition of the liquid in the liquid tank is arranged on the rotating shaft 26. The sensor and the controller 211 are connected using existing technologies as required. The sensor sends the monitored sloshing condition of the liquid to the controller 211. The driver 210 and the first motor 29 are connected to the controller 211 using existing technologies as required.

[0044] Fixed plates 28 connected to the connecting assembly 3 are fixedly arranged on both sides of the rotating shaft 26 .

[0045] like Figure 8 As shown. An inspection port is provided on the top of the shell 21 to facilitate the inspection of the first motor 29, the driver 210 and the controller 211 inside the shell 21. A cover plate 22 is provided on the shell 21 to block the inspection port, and a limit platform 212 is provided at the inspection port. The cover plate 22 is located on the limit platform 212, and the limit platform 212 positions the cover plate 22. A sealing gasket is provided between the cover plate 22 and the limit platform 212 to improve the sealing between the cover plate 22 and the shell 21. An ear plate 213 is fixedly provided on the cover plate 22, and the cover plate 22 is fixedly connected to the shell 21 through the ear plate 213. Four ear plates 213 are evenly provided on the cover plate 22, and the ear plates 213 are locked and fixedly connected to the shell 21 by screws.

[0046] like Fig. 9As shown. The connection assembly 3 includes a U-shaped hydrofoil arm 31, one end of which is provided with a long arm 32, and the other end of which is provided with a short arm 33. The hydrofoil arm 31, the long arm 32 and the short arm 33 are an integrated structure. The end of the long arm 32 is provided with a socket 34 for inserting the fixing plate 28 on the rotating shaft 26, and the socket 34 is provided with a connecting hole 35 for connecting the fixing plate 28 with the long arm 32. The screw or bolt passes through the connecting hole 35 and the fixing plate 28 to fix the fixing plate 28 with the long arm 32, so as to fix the connection assembly 3 on the rotating shaft 26. The end of the short arm 33 is provided with a mounting hole 38 connected with the suppression assembly 4. The short arm 33 is provided with a mounting groove 36, and the mounting groove 36 is provided with a second motor 37 for driving the suppression assembly 4 to rotate. The second motor 37 is electrically connected to the controller 211 using existing technology as needed, so that the rotation amplitude and rotation frequency of the second motor 37 are adjusted by the controller 211.

[0047] like Fig.10 , Fig.11 , Fig.12 As shown. The suppression assembly 4 includes a U-shaped mounting frame 41, and a flexible film 42 is arranged inside the mounting frame 41. A connecting shaft 43 is fixedly arranged on the mounting frame 41, and the connecting shaft 43 is rotatably connected to the mounting hole 38 through a bearing. The connecting shaft 43 is fixedly connected to the output shaft of the second motor 37, and the second motor 37 drives the mounting frame 41 and the flexible film 42 to rotate through the connecting shaft 43.

[0048] The inner surfaces of both sides of the mounting frame 41 are provided with connection grooves 45 for mounting the film 42, and the film 42 is fixedly provided with connection blocks 44 adapted to the connection grooves 45, and the connection blocks 44 are located in the connection grooves 45. The connection grooves 45 are dovetail grooves, and the connection blocks 44 are dovetail tenons, which improve the stability of the connection between the film 42 and the mounting frame 41. The inner surface of the bottom of the mounting frame 41 is provided with a rectangular groove for mounting the film 42.

[0049] The first motor 29 and the second motor 37 drive the film 42 to vibrate along the axial direction of the rotating shaft 26 and in a direction perpendicular to the axial direction of the rotating shaft 26, respectively, to achieve the motion coupling of the film 42 in two directions, thereby achieving oscillation and wave elimination in the lateral and longitudinal directions, and successfully achieving simultaneous anti-rolling in multiple directions, solving the problem that traditional anti-rolling devices can only eliminate waves in a single direction but cannot offset wave loads in multiple directions, and can better adapt to complex sea conditions during ship navigation. The film 42 can absorb the energy generated by the sloshing liquid during the active oscillation process. At the same time, since the film 42 significantly reduces the liquid level elevation during the vibration process, the chaos of the free liquid surface is reduced. At the same time, the film 42 and the liquid in the liquid tank have coupled motion, which changes the original natural frequency of the liquid, reduces the probability of resonance, and improves the structural safety of the ship during navigation.

[0050] The dimensions of each structure of the device described in the present invention can be adjusted according to actual conditions, and the dimensions of the device can be enlarged or reduced as a whole according to the actual conditions of the liquid tank.

[0051] The film 42 of the present invention is made of PVC, and the other main structures are made of metal. The screw rod of the T-bolt is made of metal, and the head is made of PVC. The device of the present invention has good anti-corrosion and waterproof properties.

[0052] The method for suppressing the sloshing of the ship's liquid tank based on the fixed vibrating membrane 42 hydrofoil device comprises the following steps:

[0053] S1. Weld and fix the vertical plate 11 to the inner wall of the liquid tank, adjust the position of the film 42 according to the height of the liquid level in the liquid tank, and the upper and lower parts of the side wall of the shell 21 are locked and connected with the vertical plate 11 through T-bolt locking pieces 24 and adjustment holes 13 respectively.

[0054] S2. One end of the connecting rod 23 is fixedly connected to the housing 21 through a bolt, and the other end of the connecting rod 23 is locked and connected to the vertical plate 11 through a T-bolt locking member 24 and an adjustment hole 13.

[0055] S3. The flow field information of the liquid surface in the liquid tank is detected by the sensor, and the information is fed back to the controller 211. The staff manually adjusts the rotation amplitude, rotation frequency and output power of the first motor 29 and the second motor 37 according to the feedback information of the controller 211 or automatically adjusts the rotation amplitude, rotation frequency and output power of the first motor 29 and the second motor 37 through the driver 210.

[0056] Therefore, the use of the vibrating membrane hydrofoil device for suppressing tank sloshing and the suppression method thereof as described in the present invention can solve the problem that the existing anti-rolling device has a poor effect in alleviating tank sloshing.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A vibrating membrane hydrofoil device for suppressing tank sloshing, characterized in that: It includes a suppression component, one side of which is provided with a base for driving the suppression component to rotate and vibrate along its axial direction, the base is connected to the suppression component through a connecting component, the connecting component drives the membrane hydrofoil assembly to rotate and vibrate along a direction perpendicular to the axial direction, and the base is connected to the inner wall of the liquid tank through a fixing component; The fixing assembly includes a vertical plate, which is fixed on the inner wall of the liquid tank, and the vertical plates are connected by a crossbeam. The vertical plates are provided with a long strip-shaped adjustment hole for fixing the base, and the height of the base is adjusted through the adjustment hole; The base includes a shell, a side wall of the shell is connected to the fixed component, a rotating shaft is arranged on one side of the shell, the rotating shaft is rotatably connected to the shell, a first motor driving the rotating shaft to rotate is arranged inside the shell, a driver for adjusting the rotation amplitude and rotation frequency of the first motor is arranged inside the shell, a controller is arranged inside the shell, a sensor for detecting the sloshing condition of the liquid in the liquid tank is arranged on the rotating shaft, the sensor is connected to the controller, and the driver and the first motor are both connected to the controller; fixing plates connected to the connecting component are arranged on both sides of the rotating shaft; The connecting assembly comprises a U-shaped hydrofoil arm, a long arm is provided at one end of the hydrofoil arm, a short arm is provided at the other end of the hydrofoil arm, the end of the long arm is provided with a socket for inserting a fixing plate on the rotating shaft, and the socket is provided with a connecting hole for connecting the fixing plate with the long arm; the end of the short arm is provided with a mounting hole connected to the suppression assembly, and a mounting groove is provided on the short arm, and a second motor for driving the suppression assembly to rotate is provided in the mounting groove; The suppression component comprises a U-shaped installation frame, the flexible film is arranged inside the installation frame, a connecting shaft is arranged on the installation frame, the connecting shaft is rotatably connected to the installation hole, and the connecting shaft is connected to the output shaft of the second motor.

2. A vibrating membrane hydrofoil device for suppressing tank sloshing according to claim 1, characterized in that: A sleeve is arranged on the outside of the rotating shaft, the sleeve is rotatably connected to the shell, the sleeve is connected to the output shaft of the first motor, a limit block is arranged on the inner surface of the sleeve, a limit groove matched with the limit block is arranged on the outer surface of the rotating shaft, the limit block is located in the limit groove, and the sleeve drives the rotating shaft to rotate through the limit block and the limit groove.

3. A vibrating membrane hydrofoil device for suppressing tank sloshing according to claim 2, characterized in that: Inclined connecting rods are arranged on both sides of the shell, one end of the connecting rod is connected to the shell, and the other end of the connecting rod is connected to the fixing assembly through a locking piece.

4. A vibrating membrane hydrofoil device for suppressing tank sloshing according to claim 3, characterized in that: An inspection port is provided on the top of the shell, a cover plate for sealing the inspection port is provided on the shell, a limit platform is provided at the inspection port, the cover plate is located on the limit platform, a sealing gasket is provided between the cover plate and the limit platform, an ear plate is provided on the cover plate, and the cover plate is fixedly connected to the shell through the ear plate.

5. A vibrating membrane hydrofoil device for suppressing tank sloshing according to claim 4, characterized in that: The inner surfaces on both sides of the installation frame are provided with connecting grooves for installing the film, and the film is provided with connecting blocks adapted to the connecting grooves. The connecting blocks are located in the connecting grooves, the connecting grooves are dovetail grooves, and the connecting blocks are dovetail tenons. A rectangular groove for installing the film is provided on the inner surface of the bottom of the installation frame.

6. A method for suppressing tank sloshing by using a vibrating membrane hydrofoil device according to claim 5, characterized in that: The following steps are involved: S1. Weld and fix the vertical plate to the inner wall of the liquid tank, adjust the position of the membrane according to the height of the liquid level in the liquid tank, and lock the upper and lower parts of the shell side wall with the vertical plate through T-bolt locking parts and adjustment holes respectively; S2, one end of the connecting rod is fixedly connected to the housing by means of bolts, and the other end of the connecting rod is locked and connected to the vertical plate by means of a T-bolt locking member and an adjustment hole; S3. The flow field information of the liquid surface in the liquid tank is detected by the sensor, and the information is fed back to the controller. The staff manually adjusts or automatically adjusts the rotation amplitude, rotation frequency and output power of the first motor and the second motor through the driver according to the feedback information of the controller.

Images