A multifunctional self-stabilizing jet device

Abstract

The application discloses a multifunctional self-stabilizing jet device, which comprises a bow and stern jet outer sleeve, an outboard jet inner sleeve embedded in the upper half of the bow and stern jet outer sleeve, and a coaxial reverse power mechanism for simultaneously sucking seawater into the bow and stern jet outer sleeve and the outboard jet inner sleeve so as to simultaneously jet seawater from the sides and the bow and stern direction. The coaxial reverse power mechanism is arranged in the jet pump, which can guarantee the synchronism of the rotating speed of the impeller in the bow and stern jet outer sleeve and the outboard jet inner sleeve, prevent the whole device from rotating due to the torque, guarantee the static stability of the whole device in the vertical direction, and improve the righting performance of the device after being tilted by waves.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a multifunctional self-stabilizing injection device. 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. Summary of the Invention

[0005] In view of this, the present invention provides a multifunctional self-stabilizing injection device to solve the problems existing in the background art.

[0006] A multifunctional self-stabilizing jetting device includes a bow and stern jetting outer sleeve, an overboard jetting inner sleeve nested inside the upper half of the bow and stern jetting outer sleeve, and a coaxial reversing power mechanism for simultaneously drawing seawater into the bow and stern jetting outer sleeve and the overboard jetting inner sleeve so that the seawater is ejected simultaneously from the side and bow and stern directions.

[0007] The upper end of the bow and stern spray jacket extends horizontally to two bow and stern spray nozzles in the same radial direction. The lower end of the bow and stern spray jacket extends inclined to its outer circumference to form an attachment-type suction port. A portion of the attachment-type suction port is rectangular and the edge of the rectangular opening is provided with a distance-keeping and anti-collision component.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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 attached 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.

[0018] Preferably, the center line of the suction channel of the adhesive suction port is inclined downward, and the upper suction port wall and the lower suction port wall are both inclined downward with different inclination angles. Multiple guide plates evenly distributed around the circumference are connected between the upper suction port wall and the lower suction port wall, and the guide plates are arranged radially.

[0019] Alternatively, the center line of the suction channel of the attached suction port is inclined upward, the upper suction port wall is inclined downward and the lower suction port wall is inclined upward, and multiple evenly distributed guide plates are connected between the upper suction port wall and the lower suction port wall, with the guide plates arranged radially.

[0020] Preferably, the distance-keeping and anti-collision assembly includes rubber rings fixed around the edges of the rectangular opening and distance-keeping top rods fixed at the four corners of the rectangular opening by adjusting nuts.

[0021] The beneficial effects of this invention are:

[0022] 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.

[0023] 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.

[0024] 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-the-board mooring device when it enters the self-stabilizing jet pump, which would cause instability in the anti-piracy close-to-the-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.

[0025] 4. By installing multiple guide plates inside the attached suction port, the flow of seawater entering the attached suction port can be diverted, thereby further preventing a large amount of seawater from generating a vertical torque on the entire anti-piracy close-to-board berthing device when passing through the attached suction port, which would cause instability of the anti-piracy close-to-board berthing device.

[0026] 5. By designing the attached suction port with its centerline tilted upwards, the upper suction port wall tilted downwards, and the lower suction port wall tilted upwards, and by connecting multiple evenly distributed guide plates between the upper and lower suction port walls, with the guide plates arranged radially, not only can the vertical torque generated on the entire anti-piracy close-to-the-board berthing device when a large amount of seawater passes through the attached suction port be avoided, thus preventing instability of the anti-piracy close-to-the-board berthing device; moreover, the upward tilt of the centerline of the attached suction port's suction port can counteract the flow around the outside of the suction port of the outer sleeve of the outboard jet; at the same time, tilting the lower suction port wall of the attached suction port upwards, even if the bottom of the bow and stern jet outer sleeve forms a cone shape, can reduce the impact on the water surface when the anti-piracy close-to-the-board berthing device is deployed into the water, thereby reducing the water surface impact resistance.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 9. This application provides an attached suction port at the lower end of the bow and stern jet jacket, and a distance-keeping and anti-collision component at the rectangular opening of the attached suction port. This not only ensures that the jet pump is kept at a certain distance from the hull plate when it is put into use in the water to prevent the jet pump from bumping against the hull plate with the water flow, but also ensures that the seawater flow between the rectangular opening and the hull plate is unobstructed. At the same time, it also creates a negative pressure between the rectangular opening and the outside of the hull plate, which facilitates the jet pump to attach to the side of the hull plate.

[0031] 10. This application can be used as a jet pump for anti-piracy berthing, to spray seawater at pirates when they are detected approaching in order to interfere with or prevent them from boarding the ship. It can also be used in special situations such as oil spills in ports that cause surface fires, to form a continuous fire-fighting spray to spray and disperse oil or flames on the water surface, and to serve as a rapid suction drainage pump. It can also be deployed on the side of naval surface ships during berthing, using the jet stream to interfere with the water surface and underwater, and to prevent underwater frogmen from attacking the ship. Attached Figure Description

[0032] 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.

[0033] Figure 1 This is one of the structural schematic diagrams of the jet pump of the present invention.

[0034] Figure 2 This is the second schematic diagram of the jet pump of the present invention.

[0035] Figure 3 yes Figure 1 Sectional view along the CC direction.

[0036] Figure 4 yes Figure 1 Sectional view along the BB direction.

[0037] Figure 5 yes Figure 1 Sectional view along the AA direction.

[0038] Figure 6 This is a cross-sectional view of the coaxial reversing mechanism in the jet pump.

[0039] Figure 7 This is a top view of the coaxial reversing mechanism in the jet pump.

[0040] Figure 8 This is a schematic diagram of the structure of the second impeller in a jet pump.

[0041] Figure 9 This is a longitudinal section view of the second impeller in the jet pump.

[0042] Figure 10 This is one of the top views of the second impeller in a jet pump.

[0043] Figure 11 This is the second schematic diagram of the structure of the second impeller in the jet pump.

[0044] Figure 12 This is the second longitudinal section view of the second impeller in the jet pump.

[0045] Figure 13 This is a schematic diagram of seawater flowing back from the overflow hole.

[0046] Figure 14 This is a schematic diagram showing the connection between the guide tube and the centrifugal guide plate in a jet pump.

[0047] Figure 15 This is a schematic diagram of the bow and stern jet jacket of the jet pump.

[0048] Figure 16 This is a schematic diagram of the self-stabilizing state of the jet pump.

[0049] Figure 17 This is a schematic diagram of the attached suction port at the lower end of the bow and stern jet jacket.

[0050] Figure 18 This is a longitudinal sectional view of the attached suction port at the lower end of the bow and stern jet jacket.

[0051] Figure 19 This is a cross-sectional schematic diagram of the attached suction port at the lower end of the bow and stern jet jacket.

[0052] Figure 20 This is a diagram showing the operating status of the jet pump.

[0053] The labels in the diagram mean:

[0054] 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;

[0055] 2 is the inner sleeve for the external jet; 2.1 is the external jet nozzle;

[0056] 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;

[0057] 4 is an attached suction port; 4.1 is a guide vane; 4.2 is a rubber ring; 4.3 is a spacer rod;

[0058] 5 is a coaxial reversing mechanism;

[0059] 6 represents the drive mechanism; 6.1 represents the fixed plate; 6.2 represents the drive housing; 6.3 represents the drive motor;

[0060] 7 is the suction port of the catheter;

[0061] 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;

[0062] 9 is the reverse transmission rod; 9.1 is the reverse output gear;

[0063] 10 is a shaft seal;

[0064] 11 is the outer panel;

[0065] 12 represents the water surface. Detailed Implementation

[0066] 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.

[0067] 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.

[0068] 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."

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] This invention provides a multifunctional self-stabilizing jetting device. The jetting pump is connected to the jetting assembly of a marine anti-piracy close-to-board mooring device to provide lateral jetting flow to the jetting assembly. Both the jetting pump and the jetting assembly are supported by a pulley bracket assembly.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] The upper end of the bow and stern jet outer sleeve 1 extends horizontally with two bow and stern jet nozzles 1.1 of the same diameter, and the lower end of the bow and stern jet outer sleeve 1 extends obliquely outward to form an attached suction port 4. Specifically, 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 nozzles 1.1 are located at the upper end of the upper cylinder 1.3, and the attached 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.

[0080] The attached suction port 4 can be designed in any structural form that can quickly and stably draw seawater. However, regardless of the structural form, it consists of two butterfly plates, one upper and one lower, fixed to the lower end of the lower cylinder 1.4. Multiple evenly distributed guide plates 4.1 are connected between the upper and lower butterfly plates, and the guide plates 4.1 are arranged radially.

[0081] The attached suction port 4 can be connected to the lower cylinder 1.4 of the bow and stern injection outer sleeve 1 via a flange, or it can be integrally connected to the lower cylinder 1.4 of the bow and stern injection outer sleeve 1.

[0082] The attached suction port 4 has a circular opening and a rectangular opening. The rectangular opening edge is equipped with a distance-keeping and anti-collision component. The distance-keeping and anti-collision component is used to ensure that the jet pump is placed in the water and maintains a certain distance from the outer plate of the ship. It can also prevent the jet pump from bumping into the outer plate with the water flow and causing damage to the outer plate of the ship.

[0083] The distance-keeping and anti-collision assembly includes rubber rings 4.2 fixed around the perimeter of the rectangular opening and distance-keeping top rods 4.3 fixed at the four corners of the rectangular opening via adjusting nuts. The distance-keeping top rods 4.3 may also be covered with rubber. The rubber rings 4.2 prevent damage to the outer plating. The distance-keeping top rods 4.3 not only maintain a certain distance between the rectangular opening and the hull plating to ensure unobstructed flow, but also create a negative pressure between the rectangular opening and the outside of the hull plating, facilitating the attachment of the jet pump to the side of the outer plating.

[0084] In one embodiment, the centerline of the suction channel of the attached suction port 4 is inclined downwards. Both the upper suction port wall (i.e., the upper butterfly plate) and the lower suction port wall (i.e., the lower butterfly plate) of the attached suction port 4 are inclined downwards, but their inclination angles are different. Multiple evenly distributed guide plates 4.1 are connected between the upper and lower suction port walls, and the guide plates 4.1 are arranged radially. The guide plates 4.1 can divert the flow of seawater sucked into the attached suction port 4 for bow and stern jetting, thus preventing a large amount of seawater from generating a vertical torque on the entire anti-piracy close-to-the-board berthing device when passing through the attached suction port 4, which could cause instability in the anti-piracy close-to-the-board berthing device.

[0085] In another embodiment, the centerline of the suction channel of the attached suction port 4 is inclined upward, the upper suction wall of the attached suction port 4 is inclined downward, and the lower suction wall is inclined upward. Multiple evenly distributed guide plates 4.1 are connected between the upper and lower suction walls, and the guide plates 4.1 are arranged radially. This type of attached suction port structure not only effectively solves the problem of instability caused by the vertical torque generated on the entire anti-piracy close-to-the-board berthing device when a large amount of seawater passes through the attached suction port 4; but also, by tilting the centerline of the suction channel of the attached suction port 4 upward, it can counteract the flow around the outside of the duct suction port 7 of the outer sleeve of the outer casing 2 of the outer jet; simultaneously, by tilting the lower suction wall of the attached suction port 4 upward, even if the bottom of the bow and stern jet outer casing 1 forms a cone shape, it can reduce the impact on the water surface when the anti-piracy close-to-the-board berthing device is deployed into the water, thus mitigating the water surface impact resistance.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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, then into the jetting assembly 11 from the outboard jet port 2.1, and finally outboard jet from the outboard jetting pipe of the jetting 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 transmission rod 8.1, 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 8.1, the forward rotation output gear 8.1 meshes with the transmission gear 8.2, and the reverse rotation output gear 8.1 meshes with the transmission gear 8.2, ... The output gear 9.1 meshes with the output gear 9.1, thereby transmitting power to the reverse output gear 9.1. The reverse output gear 9.1 then drives the reverse transmission rod to rotate in the opposite direction, thereby causing the second impeller 3.2 to rotate 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 ejects it from the bow and stern jet port 1.1. The ejected seawater will shoot and push away the pirate speedboat, interfere with and prevent the pirate speedboat from approaching the side, and ultimately achieve the purpose of driving away the pirate speedboat.

[0107] Since seawater is drawn in radially through the attached 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.

[0108] 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.

[0109] 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.

[0110] Before using the above-mentioned self-stabilizing injection pump, it needs to be debugged, including the following points:

[0111] 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);

[0112] 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.

[0113] 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.

[0114] When the jet pump of this application is put into use in water, its upper casing is fixed to the outer plate of the hull side by a bracket. The lower part of its casing is provided with an attachment-type suction port, which allows the jet pump to be attached to the side of the outer plate and maintain a certain distance from the outer plate of the hull, thereby preventing the jet pump from bumping against the outer plate with the water flow. Moreover, it can keep the seawater flow between the attachment-type suction port and the outer plate of the hull unobstructed, so that the attachment-type suction port and the outer plate of the hull form a negative pressure.

[0115] 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 multifunctional self-stabilizing injection device, 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 to two bow and stern jet ports (1.1) on the same radial direction. The lower end of the bow and stern jet sleeve (1) extends inclined to its outer circumference to form an attached suction port (4). A portion of the opening of the attached suction port (4) is set in a rectangle and the edge of the rectangular opening is provided with a distance-keeping and anti-collision component. 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 in the outer sleeve (2) of the outboard jet and the reverse rotation part is located in the bow and stern jet outer sleeve (1). The impeller of the reverse rotation part is provided with multiple overflow holes (3.2b1) evenly distributed in the circumferential direction. 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).

2. The multifunctional self-stabilizing injection device according to claim 1, characterized in that, 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).

3. The multifunctional self-stabilizing injection device 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.

4. The multifunctional self-stabilizing injection device 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.

5. The multifunctional self-stabilizing injection device according to claim 4, 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).

6. The multifunctional self-stabilizing injection device according to claim 5, characterized in that, The guide tube (3.2a) consists of a cylinder (3.2f) and a trumpet-shaped arc transition section (3.2g) extending downward from the lower edge of the cylinder (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 cylinder (3.2f). The diameter of the baffle (3.2b) is larger than the outer diameter of the coaxial reversing mechanism (5), and the overflow hole (3.2b1) is provided on the baffle (3.2b).

7. The multifunctional self-stabilizing injection device 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 attached 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).

8. The multifunctional self-stabilizing injection device according to claim 1, characterized in that, The center line of the suction channel of the attached suction port (4) is inclined downward. The upper suction port wall and the lower suction port wall of the attached suction port (4) are both inclined downward and the inclination angles of the two are different. Multiple guide plates (4.1) are evenly distributed around the circumference between the upper suction port wall and the lower suction port wall. The guide plates (4.1) are arranged radially. Alternatively, the center line of the suction channel of the attached suction port (4) is inclined upward, the upper suction port wall of the attached suction port (4) is inclined downward, the lower suction port wall is inclined upward, and multiple evenly distributed guide plates (4.1) are connected between the upper suction port wall and the lower suction port wall, and the guide plates (4.1) are arranged radially.

9. The multifunctional self-stabilizing injection device according to claim 1, characterized in that, The distance-keeping and anti-collision assembly includes rubber rings (4.2) fixed around the edges of the rectangular opening and distance-keeping top rods (4.3) fixed at the four corners of the rectangular opening by adjusting nuts.

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