A pirate-proof docking jet pump with an impact self-releasing suction

Abstract

The application discloses a pirate-preventing connection spouting pump with an impact self-releasing suction port, which comprises a bow and stern spouting outer sleeve, an outboard spouting inner sleeve embedded in the upper half of the bow and stern spouting outer sleeve, and a coaxial reverse power mechanism for simultaneously sucking seawater into the bow and stern spouting outer sleeve and the outboard spouting inner sleeve to spout seawater from the side and the bow and stern direction. The coaxial reverse power mechanism is arranged in the spouting pump, which can guarantee the synchronism of the rotating speed of the impeller in the bow and stern spouting outer sleeve and the outboard spouting inner sleeve, prevent the whole pirate-preventing near-shore berthing device from rotating due to torque, guarantee the static stability of the whole pirate-preventing near-shore berthing device in the vertical direction, and improve the righting performance of the pirate-preventing near-shore berthing device after being tilted by waves.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to an anti-piracy docking jet pump with an impact-type self-releasing suction port. Background Technology

[0002] When ocean-going vessels are sailing or anchored, pirates typically approach and moor on the side of the ship using small, high-speed boats (usually boarding from the sides of the superstructure). They then use grappling hooks, gun emplacements, and ladders to board (boarding: ascending the freeboard deck, generally about 10-20 meters above the water), aiming to seize control of the bridge and take over the vessel as quickly as possible. Although there are specialized maritime rescue forces internationally, it takes time to arrive at the scene after receiving a report; while ships are equipped with specialized anti-piracy equipment or facilities, they cannot completely guarantee protection against pirate sabotage. Once pirates board and take control of the vessel, they pose a serious threat to the personal safety of the crew and cause property damage to the ship.

[0003] The main defensive measures currently used are water cannons and obstacles fixed on the side decks to interfere with or prevent pirates from boarding the ship. However, in actual use, these measures are subject to limitations such as being easily damaged, having blind spots, poor reliability, and insufficient range of action, which affect the effectiveness of the defense. In addition, the cost of large-scale deployment is also high, which seriously restricts the effectiveness of the defense.

[0004] Currently, anti-piracy devices use a series-connected long-lift electric jet pump set. When the pump motor starts, the entire device will rotate due to torque, affecting the overall static stability of the device during use. Furthermore, the jet pump set uses two sets of pumps, one for forward rotation and one for reverse rotation, arranged in series. Since two pump motors work simultaneously, if either one fails during use, it will directly affect the reliability of the entire device. In addition, each set of pumps has its own control system, which needs to be equipped with two motor control systems. The speed of the two motors needs to be synchronized, which brings inconvenience to assembly, operation, and maintenance. Moreover, excessive back pressure at the pump suction port after the motor starts will affect the vertical stability of the entire device, causing the entire device to sink underwater and affecting its normal operation.

[0005] Furthermore, when using a series-type long-lift electric jet pump set, its suction inlet is relatively close to the water surface. In some sea areas with poor water quality, there may be oil or other impurities floating on the water surface. This makes it easy for the jet pump set to suck in the oil or impurities floating on the water surface into the pump body, affecting the normal operation of the pump set. Moreover, since the pump set suction inlet is close to the water surface, the jet pump suction inlet flow rate will be affected by the disturbance of water flow and waves between ships during docking, thus affecting the stability of the jet pump suction inlet flow rate. Summary of the Invention

[0006] In view of this, the present invention provides an anti-piracy docking jet pump with an impact-type self-releasing suction port to solve the problems existing in the background art.

[0007] An anti-piracy jet pump with an impact-type self-releasing suction port includes a bow and stern jet outer sleeve, an overboard jet inner sleeve nested in the upper half of the bow and stern jet outer sleeve, and a coaxial reversing power mechanism for simultaneously drawing seawater into the bow and stern jet outer sleeve and the overboard jet inner sleeve so that the seawater is ejected simultaneously from the side and bow and stern directions.

[0008] The upper end of the bow and stern jet sleeve extends horizontally to two bow and stern jet ports on the same radial direction. The lower flange of the bow and stern jet sleeve is connected to an extended suction port. A locking release plug is also provided at the connection between the extended suction port and the lower flange of the bow and stern jet sleeve. An impact release device is provided at the bottom of the extended suction port and is connected to the locking release plug through a hydraulic transmission pipe. When the anti-piracy docking jet pump is plunged into the water in a free fall state, the impact release device is compressed under the action of the water surface impact force, and the internal encapsulation medium is transported to the locking release plug through the hydraulic transmission pipe so that the locking release plug opens under the action of the medium pressure, thereby causing the impact release device and the hydraulic transmission pipe to fall off from the bottom of the filter suction port.

[0009] The upper end of the outer sleeve of the outboard jet extends vertically upward from the top of the outer sleeve of the bow and stern jet, and the end opening of the extended section is used as an outboard jet port connected to the outboard jet pipe of the ship's anti-piracy close-to-the-board mooring device. The lower end of the outer sleeve of the outboard jet extends radially downward at an angle to a plurality of circumferentially evenly distributed duct suction ports, which extend out of the outer sleeve of the bow and stern jet.

[0010] The forward rotation part of the coaxial reversing power mechanism is located inside the outer sleeve of the outboard jet, and the reverse rotation part is located inside the outer sleeve of the bow and stern jet.

[0011] Preferably, the coaxial reversing power mechanism includes a drive mechanism, a forward rotation transmission rod, a first impeller, a coaxial reversing mechanism, and a second impeller. The drive mechanism is fixed inside the outer casing of the outboard jet. The output end of the drive mechanism is connected to the vertically arranged forward rotation transmission rod. The forward rotation transmission rod is provided with a first impeller, and its end extends from the bottom of the outer casing of the outboard jet and is connected to the coaxial reversing mechanism fixed at the bottom of the outer casing of the outboard jet. The output end of the coaxial reversing mechanism is vertically connected to a reversing transmission rod coaxial with the forward rotation transmission rod. The reversing transmission rod is provided with a second impeller, and its end is fixed to the bottom of the bow and stern jet outer casing.

[0012] Preferably, the coaxial reversing mechanism includes a housing and a forward output gear, a reverse output gear, and a transmission gear disposed within the housing. The forward transmission rod passes through the housing and is connected to the forward output gear. The forward output gear meshes with multiple transmission gears that are evenly and symmetrically arranged on its outer circumference. Adjacent transmission gears are connected by a fixed rod. The reverse output gear surrounds multiple transmission gears to mesh with the transmission gears.

[0013] Preferably, the drive mechanism includes a drive housing fixed inside the outer spray inner sleeve by a fixing plate, and a drive motor disposed inside the drive housing. The output end of the drive motor is connected to the forward rotation transmission rod. The cable of the drive motor passes through the drive housing and the outer spray port of the outer spray inner sleeve in sequence and is connected to the controller of the marine anti-piracy close-to-board berthing device.

[0014] Preferably, both the first impeller and the second impeller are axial flow impellers or centrifugal impellers; or the first impeller is an axial flow impeller and the second impeller is a centrifugal impeller.

[0015] Preferably, the centrifugal impeller includes a guide tube sleeved around the reverse drive rod but not in contact with it, a baffle fixed to the reverse drive rod and flush with the upper edge of the guide tube, and centrifugal guide plates for connecting the guide tube and the baffle. Multiple centrifugal guide plates are fixed inside the guide tube at specific skew angles deviating from the radial direction around the reverse drive rod and are perpendicular to the baffle. The skew direction of the centrifugal guide plates is opposite to the rotation direction of the reverse drive rod.

[0016] The lower edge of the guide tube forms an annular centrifugal suction port with the reverse transmission rod, and the upper edge forms an annular centrifugal outlet with the outer circumference of the baffle.

[0017] Preferably, the guide tube consists of a cylinder body and a funnel-shaped arc transition section extending downward from the lower edge of the cylinder body. The lower edge of the centrifugal guide plate is fixed to the arc transition section, a portion of its upper edge is fixed to the baffle, and the side facing away from the reversing transmission rod is fixed to the inner wall of the cylinder body. The diameter of the baffle is larger than the outer diameter of the coaxial reversing mechanism.

[0018] Preferably, the bow and stern jet outer sleeve includes an upper cylinder, a lower cylinder, and an inverted conical transition cylinder connecting the upper and lower cylinders. The bow and stern jet nozzles are located at the upper end of the upper cylinder, and the extended suction port is located at the lower end of the lower cylinder. The second impeller is located in the transition cylinder to avoid the change in jet flow rate in the bow and stern direction affecting the rotational speed of the second impeller and the reverse drive rod.

[0019] Preferably, the extended suction port includes a connecting flange fixed to the bottom flange of the bow and stern jet jacket, a hose fixed to the connecting flange, and a filter suction port fixed to the end of the hose for filtering floating objects or impurities in the water and preventing water wave disturbance from affecting the suction port flow rate.

[0020] Preferably, the filter inlet includes a retaining ring fixed to the end of the hose, a hollowed-out conical cover fixed to the lower surface of the retaining ring, a filter screen disposed in the hollowed-out portion of the hollowed-out conical cover, and an impact-resistant cap fixed to the center of the bottom of the hollowed-out conical cover.

[0021] The outer surface of the hose is provided with reinforcing rings in both the circumferential and axial directions.

[0022] Preferably, the impact release device includes an impact shield, a wave-shaped piston tube fixed inside the impact shield, and a second connection port located on the upper end of the outer wall of the impact shield. The top of the wave-shaped piston tube is provided with a slot for locking the entire impact release device at the bottom of the filter suction port. The inside of the wave-shaped piston tube is pre-filled with an encapsulating medium. One end of the hydraulic transmission tube is fixed to the second connection port. The second connection port is connected to the inner cavity of the wave-shaped piston tube so that when the wave-shaped piston tube is compressed under the impact force of the water surface, the encapsulating medium inside it enters the locking release plug through the second connection port and the hydraulic transmission tube, causing the locking release plug to open under the pressure of the medium.

[0023] Preferably, the locking release bolt includes a bolt sleeve inserted from below into the bottom flange and connecting flange of the bow and stern jet sleeve, and a plug inserted from above into the bolt sleeve. The inner wall of the bolt sleeve is provided with multiple annular grooves evenly distributed from top to bottom. The outer wall of the plug is provided with multiple annular protrusions corresponding to the annular grooves and locked in the annular grooves. The head of the bolt sleeve is provided with a first connection port communicating with its inner cavity, and the other end of the hydraulic transmission pipe is fixed in the first connection port.

[0024] The beneficial effects of this invention are:

[0025] 1. By setting a coaxial reversing power mechanism in the jet pump, the present invention can ensure the synchronization of the impeller speed in the bow and stern jet outer sleeve and the outer jet inner sleeve, prevent the entire marine anti-piracy close-to-the-board mooring device from rotating due to torque, ensure the static stability of the entire marine anti-piracy close-to-the-board mooring device in the vertical direction (axial direction), and improve the righting performance after being tilted by waves.

[0026] 2. The present invention sets the forward rotation part of the coaxial reversing power mechanism in the inner sleeve of the outboard jet and the reverse rotation part in the outer sleeve of the bow and stern jet. The seawater flowing through the outboard jet working chamber and the bow and stern jet working chamber can cool the forward rotation part and the reverse rotation part of the coaxial reversing power mechanism respectively, so as to reduce their working temperature and prevent them from affecting their normal operation due to excessive temperature.

[0027] 3. The coaxial reversing power mechanism of the present invention uses a single motor to synchronously drive two impellers located in different jet working chambers to rotate, so that seawater is drawn in radially through the attached suction port and the duct suction port respectively. This avoids excessive back pressure at the suction port and prevents the seawater from generating a vertical torque on the entire anti-piracy close-to-board mooring device when it enters the self-stabilizing jet pump, which would cause instability in the anti-piracy close-to-board mooring device and affect its normal operation. At the same time, one motor drives two impellers to rotate simultaneously, which not only makes the structure more compact and lighter, but also avoids the situation described in the background art where the failure of one motor directly affects the normal use of the entire device.

[0028] 4. This application extends the seawater intake of the bow and stern jet jacket to a certain depth below the water surface by setting an extended suction port at the lower end of the bow and stern jet jacket. This avoids the oil or garbage floating on the water surface from being sucked into the pump and affecting the operation of the pump. It also avoids the disturbance of water flow and waves between the two ships during docking from affecting the flow rate of the suction port. Furthermore, by setting the filter suction port of the extended suction port to a conical shape, the impact on the water surface when the anti-piracy close-to-the-board mooring device is deployed can be reduced, thereby mitigating the impact resistance of the water surface.

[0029] 5. This application installs an impact release device on the extended suction port at the lower end of the bow and stern jet jacket, and connects a locking release bolt to the connecting flange of the extended suction port and the bottom flange of the bow and stern jet jacket. The impact release device and the locking release bolt are connected via a hydraulic transmission pipe. Before the anti-piracy jet pump is deployed into the seawater, the impact release device and the locking release bolt work together to lock the extended suction port in a compressed state. This further reduces seawater resistance, allowing the anti-piracy jet pump to be quickly submerged in the seawater. Furthermore, the impact release device contacts the water surface and releases pressure into the water... During the descent, the impact release device is compressed under the pressure of seawater, causing the internal liquid medium to enter the locking release plug through the hydraulic transmission pipe 4.5, forcing the locking release plug to open and causing the reaction release device to automatically detach. After being released from restraint, the extended suction port automatically extends to its free length under the gravity of its anti-impact cap, thus placing its filter suction port at a certain depth below the water surface. This prevents oil floating on the water surface from being sucked into the pump and affecting the pump's operation. It also prevents the disturbance of water flow and waves between the two ships during docking from affecting the flow rate of its suction port.

[0030] 6. This application sets the second impeller as a specially designed centrifugal impeller. When the centrifugal impeller rotates, a high-pressure zone can be formed inside its guide tube, thereby diverting the seawater below the centrifugal suction port to flow through its interior, providing a stable jet flow rate for the bow and stern jet working chambers. At the same time, under the effect of the high-pressure zone formed inside the guide tube diverting the seawater below the centrifugal suction port, a low-pressure zone will be formed in the gap between the upper surface of the baffle and the coaxial reversing mechanism. In order to eliminate the low-pressure zone, this application sets multiple overflow holes on the plate surface of the baffle near the reversing transmission rod, so that the seawater below the baffle can flow directly upward from the overflow holes. This not only effectively eliminates the low-pressure zone, but also increases the liquid flow rate at the bottom of the coaxial reversing mechanism by the seawater flowing directly from the overflow holes, further cooling it.

[0031] 7. When the operating flow rate of the nozzle of the marine anti-piracy berthing device decreases, some seawater flow can flow back to the bottom of the baffle through the overflow hole, without affecting the liquid flow rate in the guide tube. The liquid flowing back into the guide tube will flow out again through the centrifugal outlet and then circulate between the baffle and the coaxial reversing mechanism. At the same time, the seawater flow flowing back to the bottom of the baffle through the overflow hole can also prevent excessive internal pressure from accumulating in the gap between the upper surface of the baffle and the coaxial reversing mechanism, playing a buffering and balancing role, which is beneficial to the overall stability of the centrifugal impeller.

[0032] 8. In this application, the second impeller is set in the transition cylinder of the bow and stern jet outer sleeve. The cooperation between the second impeller and the transition cylinder can avoid the influence of the change in jet flow rate in the bow and stern direction on the rotational speed of the second impeller and the reverse transmission rod.

[0033] 9. This invention can also be used in emergency scenarios such as firefighting of fuel oil fires on ship surfaces or docking of LNG ships with TST ships, and its applications are very wide.

[0034] 10. This application can also be used in special situations such as surface fires caused by crude oil spills in ports to form a continuous fire spray to spray and disperse fuel oil or flames on the water surface, and also serve as a rapid suction drainage pump; it can also be deployed on the side of naval surface ships during their berthing period to use the jet stream to interfere with the water surface and underwater, and prevent underwater frogmen from attacking the ships. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the jet pump of the present invention.

[0037] Figure 2 yes Figure 1 Sectional view along the CC direction.

[0038] Figure 3 yes Figure 1 Sectional view along the BB direction.

[0039] Figure 4 yes Figure 1 Sectional view along the AA direction.

[0040] Figure 5 This is a cross-sectional view of the coaxial reversing mechanism in the jet pump.

[0041] Figure 6 This is a top view of the coaxial reversing mechanism in the jet pump.

[0042] Figure 7 This is a schematic diagram of the structure of the second impeller in a jet pump.

[0043] Figure 8 This is a longitudinal section view of the second impeller in the jet pump.

[0044] Figure 9 This is one of the top views of the second impeller in a jet pump.

[0045] Figure 10 This is the second schematic diagram of the structure of the second impeller in the jet pump.

[0046] Figure 11 This is the second longitudinal section view of the second impeller in the jet pump.

[0047] Figure 12 This is a schematic diagram of seawater flowing back from the overflow hole.

[0048] Figure 13 This is a schematic diagram showing the connection between the guide tube and the centrifugal guide plate in a jet pump.

[0049] Figure 14 This is a schematic diagram of the bow and stern jet jacket of the jet pump.

[0050] Figure 15 This is a schematic diagram of the self-stabilizing state of the jet pump.

[0051] Figure 16 This is a schematic diagram showing the extension nozzle changing from a compressed state to an extended state.

[0052] Figure 17 This is a diagram showing the operating status of the jet pump.

[0053] Figure 18 This is a schematic diagram of the impact release device.

[0054] Figure 19This is a schematic diagram of the locking state of the locking release bolt.

[0055] Figure 20 This is a schematic diagram of the structure in the open position of the locking release bolt.

[0056] Figure 21 This is a schematic diagram showing the impact release device and the locking release bolt automatically detaching from the extended suction port.

[0057] The labels in the diagram mean:

[0058] 1 is the bow and stern jet outer casing; 1.1 is the bow and stern jet nozzles; 1.2 is the transition cylinder; 1.3 is the upper cylinder; 1.4 is the lower cylinder;

[0059] 2 is the inner sleeve for the external jet; 2.1 is the external jet nozzle;

[0060] 3.1 is the first impeller; 3.2 is the second impeller; 3.2a is the guide tube; 3.2b is the baffle; 3.2b1 is the overflow hole; 3.2c is the centrifugal guide plate; 3.2d is the centrifugal suction port; 3.2e is the centrifugal outlet; 3.2f is the cylinder; 3.2g is the arc-shaped transition section;

[0061] 4 is an extended suction port;

[0062] 4.1 is the connecting flange;

[0063] 4.2 is a flexible hose; 4.2a is a reinforcing ring;

[0064] 4.3 is the filter inlet; 4.3a is the retaining ring; 4.3b is the hollowed-out conical cover; 4.3c is the filter screen; 4.3d is the shockproof cap;

[0065] 4.4 is the locking release plug; 4.4a is the plug sleeve; 4.4b is the plug; 4.4c is the annular groove; 4.4d is the annular protrusion; 4.4e is the first connection port;

[0066] 4.5 is the hydraulic transmission pipe;

[0067] 4.6 is an impact release device; 4.6a is an impact guard; 4.6b is a wave-shaped piston tube; 4.6c is a second connection port; 4.6d is a slot;

[0068] 5 is a coaxial reversing mechanism;

[0069] 6 represents the drive mechanism; 6.1 represents the fixed plate; 6.2 represents the drive housing; 6.3 represents the drive motor;

[0070] 7 is the suction port of the catheter;

[0071] 8 is the forward rotation transmission rod; 8.1 is the forward rotation output gear; 8.2 is the transmission gear; 8.3 is the fixed rod;

[0072] 9 is the reverse transmission rod; 9.1 is the reverse output gear;

[0073] 10 is a shaft seal;

[0074] 11 is the outer panel;

[0075] 12 represents the water surface. Detailed Implementation

[0076] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0077] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0078] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0079] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0080] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0081] In the following description, suffixes such as "module," "part," or "unit" used to denote elements are used only for the convenience of the description of the invention and have no specific meaning in themselves. Therefore, "module" and "part" can be used interchangeably.

[0082] To better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0083] This invention provides an anti-piracy docking jet pump with an impact-type self-releasing suction port. The jet pump is connected to the jetter assembly of a marine anti-piracy close-to-board mooring device to provide lateral jet flow to the jetter assembly. Both the jet pump and the jetter assembly are supported by a pulley bracket assembly.

[0084] The aforementioned anti-piracy close-to-side mooring device is installed on the side of the ship and is used to spray water at pirates when a pirate speedboat is detected approaching the ship, so as to interfere with and prevent the pirates from approaching or landing on the ship, and drive away the pirate speedboat.

[0085] The aforementioned marine anti-piracy close-to-the-board berthing device consists of a throttle valve assembly (or flow control valve), cables, and overboard injection pipes. The throttle valve assembly (or flow control valve) works in conjunction with a self-stabilizing injection pump, and functionally, can be individually adjusted via a controller to regulate the jet flow rate of the overboard injection pipes. There are three overboard injection pipes, evenly distributed at 45° angles along the horizontal outwards from the ship's side.

[0086] The aforementioned pulley bracket assembly consists of a buoyancy block, a pulley bracket, and pulleys. The entire assembly serves to support and guide the injector kit and the injection pump.

[0087] The jet kit and pulley bracket assembly of the aforementioned marine anti-piracy close-to-side berthing device are all existing structural components, and will not be described in detail here.

[0088] The jet pump of the present invention includes a bow and stern jet outer sleeve 1, an overboard jet inner sleeve 2 nested inside the upper half of the bow and stern jet outer sleeve 1, and a coaxial reversing power mechanism for simultaneously drawing seawater into the bow and stern jet outer sleeve 1 and the overboard jet inner sleeve 2 so that the seawater is jetted simultaneously from the side and bow and stern directions. The forward rotation part of the coaxial reversing power mechanism is disposed in the overboard jet inner sleeve 2, and the reverse rotation part is disposed in the bow and stern jet outer sleeve 1.

[0089] The upper end of the bow and stern injection sleeve 1 extends horizontally with two bow and stern injection ports 1.1 of the same diameter. The lower end flange of the bow and stern injection sleeve 1 is connected to an extended suction port 4. Specifically, the bow and stern injection sleeve 1 includes an upper cylinder 1.3, a lower cylinder 1.4, and an inverted conical transition cylinder 1.2 connecting the upper cylinder 1.3 and the lower cylinder 1.4. The bow and stern injection ports 1.1 are located at the upper end of the upper cylinder 1.3, and the extended suction port 4 is located at the lower end of the lower cylinder 1.4. The diameter of the upper cylinder 1.3 is twice the diameter of the lower cylinder 1.4.

[0090] The extended suction port 4 is used to extend the suction port of the bow and stern jet jacket 1 to a certain depth below the water surface, so as to avoid the oil floating on the water surface being sucked into the pump and affecting the operation of the pump body. At the same time, it can also avoid the disturbance of water flow and waves between the two ships during docking and affecting the flow rate of the suction port. The extended suction port 4 includes a connecting flange 4.1 fixed to the bottom flange of the bow and stern jet jacket 1, a hose 4.2 fixed to the connecting flange 4.1, and a filter suction port 4.3 fixed to the end of the hose 4.2 for filtering floating objects or impurities in the water and preventing water surface wave disturbance from affecting the flow rate of the suction port.

[0091] The flexible hose 4.2 has reinforcing rings 4.2a on both the circumferential and axial directions of its outer surface to strengthen the pipe structure and prevent bending deformation when the jet pump is placed in water. The length of the flexible hose 4.2 is set according to the power of the jet pump set, so as not to affect the pump set's suction flow rate. The function of the flexible hose 4.2 is to isolate floating objects on the water surface and to prevent water wave disturbance from affecting the suction inlet flow rate.

[0092] The hose 4.2 is telescopic. In normal use, when the hose 4.2 is extended, its diameter is similar to the diameter of the lower cylinder 1.4 of the bow and stern jet outer sleeve 1, ensuring an effective cross-sectional area for seawater intake. When not in use, its length can be retracted to its shortest length for easy storage.

[0093] The filter inlet 4.3 includes a retaining ring 4.3a fixed to the end of the flexible tube 4.2, a perforated conical cover 4.3b fixed to the lower surface of the retaining ring 4.3a, a filter screen 4.3c disposed in the perforated portion of the perforated conical cover 4.3b, and an impact-resistant cap 4.3d fixed to the center of the bottom of the perforated conical cover 4.3b. The retaining ring 4.3a is used to fix the flexible tube 4.2 and the perforated conical cover 4.3b together. The retaining ring 4.3a can be welded to the bottom of the flexible tube 4.2 or fixed to the bottom of the flexible tube 4.2 by other connection methods.

[0094] In this embodiment, the hollow conical cover 4.3b is a conical shell structure composed of multiple cover rods fixed to the retaining ring 4.3a and the impact cap 4.3d. The multiple cover rods are evenly distributed in the circumferential direction, and one end of each cover rod is connected to the impact cap 4.3d, and the other end is connected to the retaining ring 4.3a. The hollow conical cover 4.3b can also be designed as other conical shell structures.

[0095] By setting the filter suction port 4.3 of the extended suction port 4 into a cone shape, the impact on the water surface when the anti-piracy close-to-the-board mooring device is deployed can be reduced, thereby mitigating the water surface impact resistance.

[0096] In this embodiment, the impact cap 4.3d is made of cylindrical solid metal to ensure that the extended suction port 4 falls into the water and its length can be restored to its free length under the gravity of the impact cap 4.3d after being untied. It can also serve as the mounting base for the hollow conical cover 4.3b of the structure.

[0097] The connecting flange 4.1 and the bottom flange of the bow and stern jet sleeve 1 are not only fastened together with ordinary bolts and nuts, but also connected and fixed with a locking release bolt 4.4. The bottom of the filter inlet 4.3 is also equipped with an impact release device 4.6, which is connected to the locking release bolt 4.4 via a hydraulic transmission pipe 4.5. When the anti-piracy docking jet pump is plunged into the water in a free-fall state, the impact release device 4.6 is compressed under the impact force of the water surface, and its internal encapsulation medium is transported to the locking release bolt 4.4 through the hydraulic transmission pipe 4.5. This causes the locking release bolt 4.4 to open under the pressure of the medium, thereby causing the impact release device 4.6 and the hydraulic transmission pipe 4.5 to detach from the bottom of the filter inlet 4.3.

[0098] Specifically, the locking release bolt 4.4 includes a bolt sleeve 4.4a inserted from below into the bottom flange and connecting flange 4.1 of the bow and stern injection outer sleeve 1, and a bolt plug 4.4b inserted from above into the bolt sleeve 4.4a. The inner wall of the bolt sleeve 4.4a is provided with a plurality of annular grooves 4.4c evenly distributed from top to bottom. The outer wall of the bolt plug 4.4b is provided with a plurality of annular protrusions 4.4d corresponding to the annular grooves 4.4c and locked in the annular grooves 4.4c. The head of the bolt sleeve 4.4a is provided with a first connection port 4.4e communicating with its inner cavity. One end of the hydraulic transmission pipe 4.5 is fixed in the first connection port 4.4e.

[0099] The impact-type release device 4.6 includes an impact shield 4.6a, a wave-shaped piston tube 4.6b fixed inside the impact shield 4.6a, and a second connection port 4.6c located on the upper part of the outer wall of the impact shield 4.6a. The top of the wave-shaped piston tube 4.6b is provided with a slot 4.6d for locking the entire impact-type release device 4.6 into the bottom of the filter suction port 4.3. The inside of the wave-shaped piston tube 4.6b is pre-filled with a sealing medium. The other end of the hydraulic transmission pipe 4.5 is fixed to the second connection port 4.6c. The second connection port 4.6c is connected to the inner cavity of the wave-shaped piston tube 4.6b so that when the wave-shaped piston tube 4.6b is compressed under the impact force of the water surface, the sealing medium inside it enters the locking release plug 4.4 through the second connection port 4.6c and the hydraulic transmission pipe 4.5, so that the locking release plug 4.4 opens under the pressure of the medium.

[0100] When the anti-piracy jet pump is not deployed into the water, the hose 4.2 of the extended suction port 4 at the lower end of the bow and stern jet outer sleeve 1 is in a compressed state, that is, the entire extended suction port 4 is in a compressed state. Since the impact release device 4.6 is fixedly engaged at the bottom of the filter suction port 4.3 of the extended suction port 4, and the hydraulic transmission pipe 4.5 connected to its upper end is fixed to the locking release bolt 4.4, the length of the extended suction port 4 can be maintained in a compressed state. When the anti-piracy jet pump is deployed vertically (falling into the water in a free fall state), as the impact release device 4.6 contacts the water surface and sinks into the water, its corrugated piston tube 4.6b is compressed under the impact force of the water surface. During the compression of the corrugated piston tube 4.6b, the encapsulation medium inside it passes through the second connection port 4.6c. The hydraulic transmission pipe 4.5 enters the locking release plug 4.4. Under the action of the medium pressure, the plug 4.4b of the locking release plug 4.4 disengages from the plug sleeve 4.4a. The plug sleeve 4.4a falls off from the bottom flange and connecting flange 4.1 of the bow and stern injection outer sleeve 1. The entire impact release device 4.6, along with the hydraulic transmission pipe 4.5, falls off from the bottom of the filter suction port 4.3. After the hose 4.2 is released, under the gravity of the anti-impact cap 4.3d, the length of the hose 4.2 automatically extends to its free length, thereby placing the filter suction port 4.3 of the extended suction port 4 at a certain depth below the water surface. This prevents oil floating on the water surface from being sucked into the pump and affecting the pump operation. It also prevents the disturbance of water flow and waves between the two ships during docking from affecting the flow rate of its suction port.

[0101] The outer sleeve 2 of the outboard jet is fitted inside the outer sleeve 1 of the bow and stern jet. Its upper end extends vertically upward from the top of the outer sleeve 1, and the end opening of its extended section serves as an outer jet port 2.1 to provide a stable jet flow rate to the outer jet pipe of the jet assembly. The lower end of the outer sleeve 2 extends radially downward at an angle to form multiple circumferentially evenly distributed duct suction ports 7. The duct suction ports 7 extend out of the outer sleeve 1 of the bow and stern jet, that is, the duct suction ports 7 are evenly distributed in a ring array around the circumference of the outer sleeve 2 of the outer sleeve 2, and converge at the bottom of the outer sleeve 2 of the outer sleeve 2 and merge with it as one unit. In this embodiment, eight duct suction ports 7 are provided on the bottom circumference of the outer sleeve 2 of the outer sleeve 2.

[0102] Since the inner sleeve 2 of the outboard jet is fitted inside the outer sleeve 1 of the bow and stern jet, and its duct suction port 7 extends out of the outer sleeve 1, a bow and stern jet working chamber is formed between the inner sleeve 2 and the outer sleeve 1. The inner sleeve 2 itself forms an independent outboard jet working chamber. Seawater drawn in by the attached suction port 4 enters the jet assembly through the bow and stern jet working chamber via the bow and stern jet ports 1.1, while seawater drawn in by the duct suction port 7 enters the jet assembly through its outboard jet port 2.1 and is then ejected from the outboard jet pipe of the jet assembly.

[0103] Meanwhile, since the forward rotation part of the coaxial reversing power mechanism is located inside the outer sleeve 2 of the outboard jet, and the reverse rotation part passes through the bottom of the outer sleeve 2 of the outboard jet and is placed inside the outer sleeve 1 of the bow and stern jet, the seawater flowing through the outboard jet working chamber and the bow and stern jet working chamber can cool the forward rotation part and the reverse rotation part of the coaxial reversing power mechanism respectively, so as to reduce their working temperature and prevent them from affecting their normal operation due to excessive temperature.

[0104] The coaxial reversing power mechanism includes a drive mechanism 6, a forward rotation transmission rod 8, a first impeller 3.1, a coaxial reversing mechanism 5, a reversing transmission rod 9, and a second impeller 3.2. The drive mechanism 6, the forward rotation transmission rod 8, and the first impeller 3.1 constitute the forward rotation part of the coaxial reversing power mechanism, while the coaxial reversing mechanism 5, the reversing transmission rod 9, and the second impeller 3.2 constitute the reversing part of the coaxial reversing power mechanism.

[0105] The drive mechanism 6 is fixed inside the outer spray sleeve 2. The output end of the drive mechanism 6 is connected to the vertically arranged forward rotation transmission rod 8. The first impeller 3.1 is arranged on the forward rotation transmission rod 8. The end of the forward rotation transmission rod 8 extends from the bottom of the outer spray sleeve 2 and is connected to the coaxial reverse mechanism 5 fixed at the bottom of the outer spray sleeve 2. The output end of the coaxial reverse mechanism 5 is vertically connected to the reverse transmission rod 9, which is coaxial with the forward rotation transmission rod 8. The second impeller 3.2 is arranged on the reverse transmission rod 9. The end of the reverse transmission rod 9 is fixed to the bottom of the bow and stern spray outer sleeve 1.

[0106] Specifically, the drive mechanism 6 includes a drive housing 6.2 fixed within the outer spray inner sleeve 2 by a fixing plate 6.1, and a drive motor 6.3 disposed within the drive housing 6.2. The output end of the drive motor 6.3 is connected to the forward rotation transmission rod 8. The cable of the drive motor 6.3 passes sequentially through the drive housing 6.2 and the outer spray port 2.1 of the outer spray inner sleeve 2, and is then connected to the controller of the marine anti-piracy close-to-board berthing device. In this embodiment, the drive housing 6.2 is fixed to the middle of the upper sleeve of the outer spray inner sleeve 2 by four horizontally arranged fixing plates 6.1, which are symmetrically arranged. The drive housing 6.2 can achieve a waterproof sealing effect.

[0107] The coaxial reversing mechanism 5 includes a housing and a forward output gear 8.1, a reverse output gear 9.1, and a transmission gear 8.2 disposed within the housing. A forward transmission rod 8 passes through the housing and connects to the forward output gear 8.1. The forward output gear 8.1 meshes with multiple transmission gears 8.2 evenly and symmetrically arranged on its outer circumference. Adjacent transmission gears 8.2 are connected by a fixing rod 8.3. The reverse output gear 9.1 encloses the multiple transmission gears 8.2 to mesh with them. The housing is fixed to the bottom of the outer spray inner sleeve 2, providing a waterproof seal. The forward output gear 8.1 outputs forward torque, and the transmission gear 8.2 transmits torque so that the rotation direction of the reverse output gear 9.1 is opposite to that of the forward output gear 8.1. In this embodiment, the bottom of the housing is conical; the reverse output gear 9.1 is U-shaped with teeth on its inner wall. The reverse transmission rod 9 passes vertically upward through the housing and is fixed to the bottom of the reverse output gear 9.1.

[0108] The rotation direction of the reverse transmission rod 9 is opposite to that of the forward transmission rod 8. Several first impellers 3.1 are evenly fixed on the forward transmission rod 8 from top to bottom, and a second impeller 3.2 is fixed on the reverse transmission rod 9.

[0109] The first impeller 3.1 and the second impeller 3.2 can both be configured as axial flow impellers or centrifugal impellers. Alternatively, the first impeller 3.1 can be configured as an axial flow impeller and the second impeller 3.2 can be configured as a centrifugal impeller.

[0110] The centrifugal impeller includes a guide tube 3.2a that is sleeved on the reverse drive rod 9 but does not contact the reverse drive rod 9, a baffle 3.2b that is fixed on the reverse drive rod 9 and flush with the upper edge of the guide tube 3.2a, and a centrifugal guide plate 3.2c for connecting the guide tube 3.2a and the baffle 3.2b.

[0111] The lower edge of the guide tube 3.2a forms an annular centrifugal suction port 3.2d between it and the reverse transmission rod 9, and the upper edge forms an annular centrifugal outlet 3.2e between it and the outer circumference of the baffle 3.2b. The guide tube 3.2a consists of a tube body 3.2f and a trumpet-shaped arc transition section 3.2g extending downward from the lower edge of the tube body 3.2f.

[0112] The guide tube 3.2a and the baffle 3.2b are connected by multiple centrifugal guide plates 3.2c. These centrifugal guide plates 3.2c are fixed within the guide tube 3.2a at specific angles deviating from the radial direction, surrounding the reversing drive rod 9, and are perpendicular to the baffle 3.2b. The deflection direction of the centrifugal guide plates 3.2c is opposite to the rotation direction of the reversing drive rod 9. The lower edge of each centrifugal guide plate 3.2c is fixed to the arc-shaped transition section 3.2g of the guide tube 3.2a, a portion of its upper edge is fixed to the baffle 3.2b, and the side facing away from the reversing drive rod 9 is fixed to the inner wall of the tube body 3.2f of the guide tube 3.2a. The contact area between the lower edge of the centrifugal guide plate 3.2c and the arc-shaped transition section 3.2g of the guide tube 3.2a should be watertight.

[0113] The diameter of the baffle 3.2b is larger than the diameter of the centrifugal suction port 3.2d but smaller than the diameter of the cylinder 3.2f. In this embodiment, the baffle 3.2b is a trapezoidal plate.

[0114] To ensure stable jet flow, the diameter of baffle 3.2b is designed with reference to the outer diameter of the housing of the coaxial reversing mechanism 5, but should be larger than the outer diameter of the coaxial reversing mechanism 5.

[0115] When the centrifugal impeller rotates, the centrifugal guide plate 3.2c rotates synchronously with the guide tube 3.2a and the baffle 3.2b, thereby forming a high-pressure zone in the guide tube 3.2a. Seawater enters the centrifugal impeller from the centrifugal suction port 3.2d and flows upward along the centrifugal guide plate 3.2c and out of the centrifugal outlet 3.2e under the guidance of the centrifugal guide plate 3.2c. At the same time, it can also guide the seawater below the centrifugal suction port 3.2d.

[0116] When the centrifugal impeller rotates, the high-pressure zone formed inside the guide tube 3.2a guides the seawater below the centrifugal suction port 3.2d. As a result, a low-pressure zone is formed in the gap between the upper surface of the baffle 3.2b and the coaxial reversing mechanism 5. In order to eliminate this low-pressure zone, multiple overflow holes 3.2b1 that are evenly distributed in the circumferential direction are provided on the plate surface of the baffle 3.2b near the reversing transmission rod 9.

[0117] The diameter of the circle containing the multiple overflow holes 3.2b1 is less than half the diameter of the centrifugal suction port 3.2d. Furthermore, the diameter and number of overflow holes 3.2b1 are designed based on the full-load flow rate of the centrifugal impeller. In this embodiment, the sum of the fluid flow rates of all overflow holes 3.2b1 does not exceed 5% of the full-load flow rate of the centrifugal impeller.

[0118] By setting an overflow hole 3.2b1 on the baffle 3.2b, the seawater below the baffle 3.2b can flow directly out from the overflow hole 3.2b1, which not only eliminates the low-pressure area, but also increases the liquid flow rate at the bottom of the coaxial reversing mechanism 5, further cooling it.

[0119] Meanwhile, when the operating flow rate of the nozzle of the anti-piracy berthing device decreases, some seawater flow will flow back to below the baffle 3.2b through the overflow hole 3.2b1, without affecting the liquid flow rate in the guide tube 3.2a. The liquid flowing back to the guide tube 3.2a will flow out again through the centrifugal outlet 3.2e, and then circulate between the baffle 3.2b and the coaxial reversing mechanism 5. At the same time, the seawater flow flowing back to below the baffle 3.2b through the overflow hole 3.2b1 can also prevent excessive internal pressure from accumulating in the gap between the upper surface of the baffle 3.2b and the coaxial reversing mechanism 5, playing a buffering and balancing role, which is beneficial to the overall stability of the centrifugal impeller.

[0120] In this embodiment, the first impeller 3.1 is an axial-flow impeller, which is composed of multiple sets of propellers. The second impeller 3.2 is a centrifugal impeller. The first impeller 3.1 is used to provide a stable flow rate to the outboard jet working chamber, and the second impeller 3.2 is used to provide a stable flow rate to the bow and stern jet working chambers. The second impeller 3.2 is installed inside the transition cylinder 1.2 of the bow and stern jet outer sleeve 1. The cooperation between the second impeller 3.2 and the transition cylinder 1.2 can prevent changes in the jet flow rate in the bow and stern directions from affecting the rotational speed of the second impeller 3.2 and the reverse transmission rod 9.

[0121] When the aforementioned coaxial reversing power mechanism is working, the drive motor 6.3 drives the forward rotation transmission rod 8 to rotate, and the first impeller 3.1 rotates to draw outside seawater from the duct suction port 7 into the outboard jet working chamber of the outboard jet inner sleeve 2, and then into the jet assembly 11 from the outboard jet port 2.1, and finally outboard jet from the outboard jet pipe of the jet assembly 11; at the same time, the forward rotation transmission rod 8 drives the forward rotation output gear 8.1 to rotate. Since the forward rotation output gear 8.1 meshes with the transmission gear 8.2 and the transmission gear 8.2 meshes with the reverse rotation output gear 9.1, the power is transmitted to the reverse rotation output gear 9.1. The reverse rotation output gear 9.1 then drives the reverse rotation transmission rod to rotate in the opposite direction, so that the second impeller 3.2 rotates synchronously with the first impeller 3.1. The second impeller 3.2 draws outside seawater from the attached suction port 4 into the bow and stern jet working chamber of the bow and stern jet outer sleeve 1, and then outboard jet from the bow and stern jet ports 1.1.

[0122] The aforementioned forward rotation transmission rod 8 is provided with a shaft seal 10 at the position where it passes through the drive housing 6.2 of the drive mechanism 6 and the bottom of the outboard jet inner sleeve 2. The reverse rotation transmission rod 9 is also provided with a shaft seal 10 at the position where it passes through the mechanism housing of the coaxial reverse rotation mechanism 5 and the bottom of the bow and stern jet outer sleeve 1.

[0123] Since the self-stabilizing jet pump of this application is equipped with two jet working chambers (inner and outer) and two sealing structures (drive housing 6.2 of drive mechanism 6 and coaxial reversing mechanism 5), and the forward rotation transmission rod 8 and the reverse rotation transmission rod 9 are coaxially arranged, shaft seals 10 need to be installed when the two transmission rods pass through the chambers and sealing structures. This ensures the normal operation of the various moving parts of the motor and pump while providing a waterproof seal.

[0124] Before using the above-mentioned self-stabilizing injection pump, it needs to be debugged, including the following points:

[0125] a. Confirm that the rotational speeds of the first impeller 3.1 rotating in the forward direction and the second impeller 3.2 rotating in the reverse direction are the same to ensure that the torque of the two sets of impellers remains consistent under no-load conditions (M forward rotation = M reverse rotation);

[0126] b. Place the self-stabilizing jet pump in the test tank, start the drive motor 6.3, and check the flow status of the bow and stern jet working chambers and the outboard jet working chamber respectively to ensure that the working flow required by the ship anti-piracy close-to-side berthing device is met.

[0127] c. If the torque of the two sets of impellers is found to be inconsistent during the test, the torque of the two sets of impellers can be kept consistent by throttling the injector kit 11 in the marine anti-piracy close-to-the-board mooring device and simultaneously increasing or decreasing the flow rate of the bow and stern injection working chambers, thus ensuring the torque stability of the self-stabilizing injection pump.

[0128] The above-mentioned self-stabilizing injection pump is used in accordance with the following steps:

[0129] Step 1: Fix the impact release device 4.6 on the anti-impact cap 4.3d of the extended suction port 4 at the lower end of the bow and stern jet sleeve 1. Install two locking release bolts 4.4 on the bottom flange and connecting flange 4.1 of the bow and stern jet sleeve 1. Connect the two locking release bolts 4.4 to the second connecting ports 4.6c on both sides of the impact release device 4.6 through the hydraulic transmission pipe 4.5. At this time, the extended suction port 4 is in a compressed state.

[0130] Step 2: Vertically deploy the anti-piracy jet pump into the water. As the impact release device 4.6 contacts the water surface and sinks into the water under gravity, the encapsulation medium inside it enters the locking release plug 4.4 through the second connection port 4.6c and the hydraulic transmission pipe 4.5 under the action of the water surface impact force. This causes the locking release plug 4.4 to open under the action of the medium pressure, thereby causing the impact release device 4.6 and the hydraulic transmission pipe 4.5 to fall off the anti-impact cap 4.3d. After the extension suction port 4 is released, under the action of the gravity of the anti-impact cap 4.3d, the length of its hose 4.2 extends to the free length state, thereby placing the filter suction port 4.3 of the extension suction port 4 at a certain depth below the water surface.

[0131] After the anti-piracy docking jet pump enters the water, seawater enters the bow and stern jet outer sleeve 1 through the filter suction port 4.3 under water pressure;

[0132] Step 3: Start the drive motor 6.3. The drive motor 6.3 drives the first impeller 3.1 and the second impeller 3.2 to rotate synchronously. The rotation of the first impeller 3.1 draws outside seawater from the duct suction port 7 into the outside jet working chamber of the outside jet inner sleeve 2, and then into the jet assembly 11 from the outside jet port 2.1, and finally sprays it out from the outside jet pipe of the jet assembly 11. At the same time, the rotation of the second impeller 3.2 draws outside seawater from the extended suction port 4 into the bow and stern jet working chamber of the bow and stern jet outer sleeve 1, and then sprays it out from the bow and stern jet ports 1.1. The sprayed seawater will propel the pirate speedboat away, interfere with and prevent the pirate speedboat from approaching the ship, and finally achieve the purpose of driving away the pirate speedboat.

[0133] Since seawater is drawn in radially through the butterfly-shaped suction port 4 and the duct suction port 7, the vertical torque generated by the seawater through the self-stabilizing jet pump on the entire anti-piracy close-to-board mooring device can be avoided, thus preventing the anti-piracy close-to-board mooring device from becoming unstable.

[0134] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A pirate-proof docking jet pump with an impact-type self-releasing suction port, characterized in that, It includes a bow and stern jet outer sleeve (1), an overboard jet inner sleeve (2) nested inside the upper part of the bow and stern jet outer sleeve (1), and a coaxial reversing power mechanism for simultaneously drawing seawater into the bow and stern jet outer sleeve (1) and the overboard jet inner sleeve (2) so that seawater is ejected simultaneously from the side and bow and stern directions. The upper end of the bow and stern jet sleeve (1) extends horizontally with two bow and stern jet ports (1.1) on the same radial direction. The lower flange of the bow and stern jet sleeve (1) is connected to an extended suction port (4). A locking release bolt (4.4) is also provided at the connection between the extended suction port (4) and the lower flange of the bow and stern jet sleeve (1). An impact release device (4.6) is provided at the bottom of the extended suction port (4), and the impact release device (4.6) is connected to the locking release bolt (4.4) through a hydraulic transmission pipe (4.5). When the anti-piracy jet pump is dropped into the water in a free fall state, the impact release device (4.6) is compressed under the action of the water surface impact force, and the internal encapsulated medium is transported to the locking release plug (4.4) through the hydraulic transmission pipe (4.5) so that the locking release plug (4.4) opens under the action of the medium pressure. The impact release device (4.6) and the hydraulic transmission pipe (4.5) fall off from the bottom of the filter suction port (4.3) so that the extension suction port (4) automatically returns from the compressed state to the free length state. The upper end of the outer sleeve (2) extends vertically upward from the top of the bow and stern outer sleeve (1), and the end opening of its extended section is used as an outer spray port (2.1) connected to the outer spray pipe of the ship's anti-piracy close-to-the-board mooring device. The lower end of the outer sleeve (2) extends radially downward at multiple circumferentially evenly distributed duct suction ports (7), which extend out of the bow and stern outer sleeve (1). The forward rotation part of the coaxial reversing power mechanism is located inside the outer spray inner sleeve (2), and the reverse rotation part is located inside the bow and stern spray outer sleeve (1); The coaxial reversing power mechanism includes a drive mechanism (6), a forward rotation transmission rod (8), a first impeller (3.1), a coaxial reversing mechanism (5), and a second impeller (3.2). The drive mechanism (6) is fixed inside the outer spray inner sleeve (2). The output end of the drive mechanism (6) is connected to the vertically arranged forward rotation transmission rod (8). The forward rotation transmission rod (8) is provided with a first impeller (3.1), and its end extends from the bottom of the outer spray inner sleeve (2) and is connected to the coaxial reversing mechanism (5) fixed at the bottom of the outer spray inner sleeve (2). The output end of the coaxial reversing mechanism (5) is vertically connected to a reversing transmission rod (9) coaxial with the forward rotation transmission rod (8). The reversing transmission rod (9) is provided with a second impeller (3.2), and its end is fixed to the bottom of the bow and stern spray outer sleeve (1). The coaxial reversing mechanism (5) includes a housing and a forward output gear (8.1), a reverse output gear (9.1), and a transmission gear (8.2) disposed within the housing. The forward transmission rod (8) passes through the housing and is connected to the forward output gear (8.1). The forward output gear (8.1) meshes with multiple transmission gears (8.2) that are evenly and symmetrically arranged on its outer circumference. Adjacent transmission gears (8.2) are connected by a fixing rod (8.3). The reverse output gear (9.1) encloses multiple transmission gears (8.2) to mesh with the transmission gears (8.2).

2. The anti-piracy docking jet pump with an impact-type self-releasing suction port according to claim 1, characterized in that, The drive mechanism (6) includes a drive housing (6.2) fixed inside the outer spray inner sleeve (2) by a fixing plate (6.1) and a drive motor (6.3) installed inside the drive housing (6.2). The output end of the drive motor (6.3) is connected to the forward rotation transmission rod (8). The cable of the drive motor (6.3) passes through the drive housing (6.2) and the outer spray port (2.1) of the outer spray inner sleeve (2) in sequence and is connected to the controller of the ship anti-piracy close-to-board berthing device.

3. The anti-piracy docking jet pump with an impact-type self-releasing suction port according to claim 1, characterized in that, Both the first impeller (3.1) and the second impeller (3.2) are axial flow impellers or centrifugal impellers; Alternatively, the first impeller (3.1) may be an axial flow impeller and the second impeller (3.2) may be a centrifugal impeller.

4. The anti-piracy docking jet pump with an impact-type self-releasing suction port according to claim 3, characterized in that, The centrifugal impeller includes a guide tube (3.2a) sleeved outside the reverse drive rod (9) but not in contact with it, a baffle (3.2b) fixed on the reverse drive rod (9) and flush with the upper edge of the guide tube (3.2a), and centrifugal guide plates (3.2c) for connecting the guide tube (3.2a) and the baffle (3.2b). Multiple centrifugal guide plates (3.2c) are fixed inside the guide tube (3.2a) at specific skew angles deviating from the radial direction, surrounding the reverse drive rod (9), and are perpendicular to the baffle (3.2b). The skew direction of the centrifugal guide plates (3.2c) is opposite to the rotation direction of the reverse drive rod (9). A ring-shaped centrifugal inlet (3.2d) is formed between the lower edge of the guide tube (3.2a) and the reverse transmission rod (9), and a ring-shaped centrifugal outlet (3.2e) is formed between the upper edge and the outer circumference of the baffle (3.2b).

5. The anti-piracy docking jet pump with an impact-type self-releasing suction port according to claim 4, characterized in that, The guide tube (3.2a) consists of a tube body (3.2f) and a funnel-shaped arc transition section (3.2g) extending downward from the lower edge of the tube body (3.2f). The lower edge of the centrifugal guide plate (3.2c) is fixed to the arc transition section (3.2g), a part of its upper edge is fixed to the baffle (3.2b), and the side away from the reversing transmission rod (9) is fixed to the inner wall of the tube body (3.2f). The diameter of the baffle (3.2b) is larger than the outer diameter of the coaxial reversing mechanism (5).

6. The anti-piracy docking jet pump with an impact-type self-releasing suction port according to claim 1, characterized in that, The bow and stern jet outer sleeve (1) includes an upper cylinder (1.3), a lower cylinder (1.4), and an inverted conical transition cylinder (1.2) connecting the upper cylinder (1.3) and the lower cylinder (1.4). The bow and stern jet nozzle (1.1) is located at the upper end of the upper cylinder (1.3), and the extended suction port (4) is located at the lower end of the lower cylinder (1.4). The second impeller (3.2) is located inside the transition cylinder (1.2) to avoid the change in jet flow rate in the bow and stern direction from affecting the rotational speed of the second impeller (3.2) and the reverse transmission rod (9).

7. The anti-piracy docking jet pump with an impact-type self-releasing suction port according to claim 1, characterized in that, The extended suction port (4) includes a connecting flange (4.1) fixed to the bottom flange of the bow and stern jet jacket (1), a hose (4.2) fixed to the connecting flange (4.1), and a filter suction port (4.3) fixed to the end of the hose (4.2) for filtering floating objects or impurities in the water and preventing water wave disturbance from affecting the suction port flow.

8. The anti-piracy docking jet pump with an impact-type self-releasing suction port according to claim 7, characterized in that, The filter inlet (4.3) includes a retaining ring (4.3a) fixed to the end of the hose (4.2), a hollow conical cover (4.3b) fixed to the lower surface of the retaining ring (4.3a), a filter screen (4.3c) set in the hollow part of the hollow conical cover (4.3b), and an impact-resistant cap (4.3d) fixed to the center of the bottom of the hollow conical cover (4.3b). The outer surface of the hose (4.2) is provided with reinforcing rings (4.2a) in both the circumferential and axial directions, and the impact release device (4.6) is locked onto the impact cap (4.3d).

9. The anti-piracy docking jet pump with an impact-type self-releasing suction port according to claim 1 or 8, characterized in that, The impact-type release device (4.6) includes an impact shield (4.6a), a wave-shaped piston tube (4.6b) fixed inside the impact shield (4.6a), and a second connection port (4.6c) located on the upper end of the outer wall of the impact shield (4.6a). The top of the wave-shaped piston tube (4.6b) is provided with a slot (4.6d) for locking the entire impact-type release device (4.6) at the bottom of the filter suction port (4.3). The inside of the wave-shaped piston tube (4.6b) is pre-filled with a sealing medium. One end of the hydraulic transmission pipe (4.5) is fixed on the second connection port (4.6c). The second connection port (4.6c) is connected to the inner cavity of the wave-shaped piston tube (4.6b) so that when the wave-shaped piston tube (4.6b) is compressed under the impact force of the water surface, the sealing medium inside it enters the locking release plug (4.4) through the second connection port (4.6c) and the hydraulic transmission pipe (4.5), so that the locking release plug (4.4) opens under the pressure of the medium.

10. The anti-piracy docking jet pump with an impact-type self-releasing suction port according to claim 1, characterized in that, The locking release bolt (4.4) includes a bolt sleeve (4.4a) inserted from below into the bottom flange and connecting flange (4.1) of the bow and stern jet sleeve (1), and a plug (4.4b) inserted from above into the bolt sleeve (4.4a). The inner wall of the bolt sleeve (4.4a) is provided with multiple annular grooves (4.4c) evenly distributed from top to bottom. The outer wall of the plug (4.4b) has multiple annular protrusions (4.4d) that correspond to the annular grooves (4.4c) and are locked in the annular grooves (4.4c). The head of the bolt sleeve (4.4a) is provided with a first connection port (4.4e) that communicates with its inner cavity. The other end of the hydraulic transmission pipe (4.5) is fixed in the first connection port (4.4e).

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