CN117514940A - Pirate-prevention connection jet pump with reaction type self-release suction port - Google Patents

Abstract

The invention discloses an anti-pirate connection jet pump with a reactive self-release suction port, which comprises a bow-stern jet outer sleeve, an outboard jet inner sleeve nested at the upper part of the inside of the bow-stern jet outer sleeve, and a coaxial reversing power mechanism for sucking seawater into the bow-stern jet outer sleeve and the outboard jet inner sleeve at the same time so as to jet the seawater from the side of the ship and the direction of the bow-stern. According to the invention, the coaxial reversing power mechanism is arranged in the jet pump, so that the synchronism of the rotation speeds of the impellers in the bow-stern jet outer sleeve and the outboard jet inner sleeve can be ensured, the whole marine anti-pirate near-side berthing device is prevented from rotating due to torque, and the static stability of the whole marine anti-pirate near-side berthing device in the vertical direction is ensured, so that the return performance of the marine anti-pirate near-side berthing device after being inclined by waves is improved.

Description

Pirate-prevention connection jet pump with reaction type self-release suction port

Technical Field

The invention relates to the technical field of ship construction, in particular to an anti-pirate connection jet pump with a reactive self-release suction port.

Background

When the ocean vessel sails or berths, the pirates approach and berth the ship side through a small high-speed yacht (boarding is generally carried out on two sides of the ship superstructure), and boarding (boarding is carried out by boarding a topside deck, and is generally carried out at a height of about 10-20 m from the water surface) is carried out by adopting rope hooks, rope guns, straight ladders and the like, so that the purposes of occupying the boarding cab and controlling the ship in the shortest time are achieved. Although special maritime rescue forces exist internationally, a certain time is needed from the reception of an alarm to the driving to the place of occurrence; the ship is also provided with special anti-piracy equipment or facilities, but cannot be completely guaranteed not to be damaged by pirates. When a pirate gets on a ship and controls the ship, the personnel safety of the crew is seriously threatened, and the property loss of the ship is caused.

At present, the main defense means generally adopt fixed water cannons, barriers and the like on a side deck to interfere or prevent pirates from boarding, but limit factors such as easy damage, dead angles of dead areas, poor reliability, insufficient action range and the like exist in actual use, the defense effect is influenced, the cost of large-scale arrangement is high, and the defense effect is severely restricted.

The prior pirate prevention device adopts a series-connection type long-lift electric jet pump set, and when a pump motor is started, the whole device can automatically rotate due to torque, so that the integral static stability of the device in use is affected; the two sets of pump sets are arranged in a series manner, and because the two pump motors work simultaneously, if any one of the pump sets fails in the use process, the reliability of the whole device in the use process is directly affected, and meanwhile, the two sets of pump sets are correspondingly provided with respective control systems, namely, the two sets of pump sets are required to be provided; the two sets of motor control systems ensure synchronism of the rotating speeds of the two motors, and bring inconvenience to assembly, operation, maintenance and the like; and the back pressure at the suction port of the pump is too large after the motor is started, so that the stability of the whole device in the vertical direction can be influenced, the whole device is submerged in water, and the normal operation of the device is influenced.

When the serial long-lift electric jet pump set is used, the suction inlet of the serial long-lift electric jet pump set is close to the water surface, the water quality of certain sea areas is poor, oil or other impurities float on the water surface, so that the jet pump set easily sucks the oil or impurities and the like floating on the water surface into the pump body, and the normal operation of the pump set is influenced; and the suction inlet of the pump set is closer to the water surface, and the suction inlet flow of the jet pump can be influenced by water flow wave disturbance among ships when the ships are connected, so that the stability of the suction inlet flow of the jet pump is influenced.

Disclosure of Invention

In view of the above, the present invention provides an anti-pirate connection jet pump with a reactive self-releasing suction port, which is used for solving the problems in the prior art.

An anti-pirate connection jet pump with a reactive self-release suction port comprises a bow-stern jet outer sleeve, an outboard jet inner sleeve nested at the upper part in the bow-stern jet outer sleeve, and a coaxial reversing power mechanism for sucking seawater into the bow-stern jet outer sleeve and the outboard jet inner sleeve at the same time so as to jet the seawater from the side and the direction of the bow-stern,

the upper end of the bow-stern jet outer sleeve horizontally extends to form two bow-stern jet ports in the same radial direction, the lower end flange of the bow-stern jet outer sleeve is connected with an extending suction port, a locking release bolt is further arranged at the joint of the extending suction port and the lower end flange of the bow-stern jet outer sleeve, a reaction type release device is arranged at the bottom of the extending suction port and is communicated with the locking release bolt through an air pressure conducting pipe, when the anti-pirate jet pump is slowly thrown into water, seawater enters the reaction type release device and reacts with chemical materials packaged in the anti-pirate jet pump to generate gas, and the gas is conveyed to the locking release bolt through the air pressure conducting pipe to enable the locking release bolt to be opened under the action of gas pressure, so that the reaction type release device and the air pressure conducting pipe drop from the bottom of the filtering suction port;

The upper end of the outboard jet inner sleeve vertically extends upwards from the top of the fore-aft jet outer sleeve, the end opening of the extending section of the outboard jet inner sleeve is used as an outboard jet orifice connected with an outboard jet pipe of the marine anti-pirate near-board berthing device, the lower end of the outboard jet inner sleeve radially and downwards inclines and extends to form a plurality of guide pipe suction openings which are uniformly distributed in the circumferential direction, and the guide pipe suction openings extend out of the fore-aft jet outer sleeve;

the forward rotating part of the coaxial reverse rotating power mechanism is arranged in the outboard jet inner sleeve, and the reverse rotating part is arranged in the bow-stern jet outer sleeve.

Preferably, the coaxial reverse power mechanism comprises a driving mechanism, a forward rotation driving rod, a first impeller, a coaxial reverse mechanism and a second impeller, wherein the driving mechanism is fixed in the outboard injection inner sleeve, the output end of the driving mechanism is connected with the vertically arranged forward rotation driving rod, the first impeller is arranged on the forward rotation driving rod, the tail end of the first impeller extends out from the bottom of the outboard injection inner sleeve and is in transmission connection with the coaxial reverse mechanism fixed at the bottom of the outboard injection inner sleeve, the output end of the coaxial reverse mechanism is vertically connected with a reverse driving rod coaxial with the forward rotation driving rod, and the second impeller is arranged on the reverse driving rod, and the tail end of the second impeller is fixed at the bottom of the bow-stern injection outer sleeve.

Preferably, the coaxial reversing mechanism comprises a mechanism shell, a forward rotation output gear, a reversing output gear and a transmission gear, wherein the forward rotation output gear, the reversing output gear and the transmission gear are arranged in the mechanism shell, a forward rotation transmission rod penetrates through the mechanism shell to be connected with the forward rotation output gear, the forward rotation output gear is meshed with a plurality of transmission gears uniformly and symmetrically arranged on the outer circumference of the forward rotation output gear, two adjacent transmission gears are connected through a fixed rod, and the reversing output gear wraps the plurality of transmission gears to be meshed with the transmission gears.

Preferably, the driving mechanism comprises a driving housing fixed in the outboard jet inner sleeve through a fixing plate and a driving motor arranged in the driving housing, wherein the output end of the driving motor is connected with a forward rotation transmission rod, and a cable of the driving motor sequentially penetrates through the driving housing and the outboard jet opening of the outboard jet inner sleeve and then is connected with a controller of the marine anti-pirate near-board berthing device.

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

Preferably, the centrifugal impeller comprises a guide cylinder sleeved outside the reversing transmission rod but not in contact with the reversing transmission rod, a baffle plate fixed on the reversing transmission rod and flush with the upper edge of the guide cylinder, and a centrifugal guide plate for connecting the guide cylinder and the baffle plate, wherein a plurality of centrifugal guide plates are fixed in the guide cylinder around the reversing transmission rod at specific deflection angle intervals deviating from the radial direction and are vertically fixed with the baffle plate, the deflection direction of the centrifugal guide plate is opposite to the rotation direction of the reversing transmission rod,

An annular centrifugal suction port is formed between the lower edge of the guide cylinder and the reversing transmission rod, and an annular centrifugal outlet is formed between the upper edge of the guide cylinder and the outer circumference of the baffle plate.

Preferably, the guide cylinder is formed by a cylinder body and an arc-shaped transition section which downwards extends from the lower edge of the cylinder body and is in a horn shape, the lower edge of the centrifugal guide plate is attached and fixed with the arc-shaped transition section, a part of the upper edge of the centrifugal guide plate is fixed with a baffle plate, the side edge deviating from a reversing transmission rod is fixed with the inner wall of the cylinder body, and the diameter of the baffle plate is larger than the outer diameter of the coaxial reversing mechanism.

Preferably, the bow-stern jet outer sleeve comprises an upper cylinder, a lower cylinder and a transition cylinder which is connected between the upper cylinder and the lower cylinder and is in an inverted cone shape, the bow-stern jet orifice is arranged at the upper end of the upper cylinder, the extension suction opening is arranged at the lower end of the lower cylinder, and the second impeller is arranged in the transition cylinder to avoid the influence of jet flow change in the bow-stern direction on the rotation speed of the second impeller and the rotation speed of the reversing transmission rod.

Preferably, the extension suction port comprises a connecting flange fixed with a flange at the bottom of the bow-stern spraying outer sleeve, a hose fixed with the connecting flange, and a filtering suction port fixed at the end of the hose and used for filtering floating objects or impurities in water and avoiding water surface wave disturbance from affecting the flow of the suction port.

Preferably, the filtering suction port comprises a baffle ring fixed at the end part of the hose, a hollow conical housing fixed on the lower surface of the baffle ring, a filter screen arranged at the hollow part of the hollow conical housing, and an anti-impact cap fixed at the center of the bottom of the hollow conical housing;

reinforcing rings are arranged on the outer surface of the hose in the circumferential direction and the axial direction.

Preferably, the reaction type release device comprises an impact shield, a reaction cylinder fixed in the impact shield, and a second connecting port arranged at the upper end of the outer wall of the impact shield, wherein the top of the reaction cylinder is provided with a clamping groove for clamping the whole reaction type release device at the bottom of the filtering suction port, the centers of a top plate and a bottom plate of the reaction cylinder are connected with a valve column, a one-way valve plate is sleeved on the valve column, a valve port is arranged on the bottom plate of the reaction cylinder below the one-way valve plate, the area of the valve port is smaller than that of the one-way valve plate, chemical materials are preset in the reaction cylinder,

one end of the air pressure conducting pipe is fixed on the second connecting port, the second connecting port is communicated with the inner cavity of the reaction cylinder, chemical materials in the reaction cylinder and seawater entering the cylinder from the valve port are subjected to chemical reaction to generate gas, and the gas enters the locking release bolt through the second connecting port and the air pressure conducting pipe to enable the locking release bolt to be opened under the action of gas pressure.

Preferably, the locking release bolt comprises a bolt sleeve inserted into the bottom flange and the connecting flange of the jet outer sleeve from the lower part to the front and rear part, and a plug inserted into the bolt sleeve from the upper part, wherein a plurality of annular grooves which are uniformly distributed from top to bottom are arranged on the inner wall of the bolt sleeve, a plurality of annular bulges which correspond to the annular grooves and are clamped in the annular grooves are arranged on the outer wall of the plug, a first connecting port communicated with the inner cavity of the plug sleeve is arranged at the head part of the bolt sleeve, and the other end part of the air pressure conducting pipe is fixed in the first connecting port.

The beneficial effects of the invention are as follows:

1. according to the invention, the coaxial reversing power mechanism is arranged in the jet pump, so that the synchronism of the rotation speeds of the impellers in the bow-stern jet outer sleeve and the outboard jet inner sleeve can be ensured, the whole marine anti-pirate near-side berthing device is prevented from rotating due to torque, the static stability of the whole marine anti-pirate near-side berthing device in the vertical direction (axial direction) is ensured, and the return performance after being inclined by waves is improved.

2. According to the invention, the forward rotating part and the reverse rotating part of the coaxial reverse rotating power mechanism are respectively cooled by the seawater flowing in the outboard jet working cavity and the bow-stern jet working cavity by arranging the forward rotating part and the reverse rotating part of the coaxial reverse rotating power mechanism in the outboard jet inner sleeve and arranging the reverse rotating part in the bow-stern jet outer sleeve, so that the working temperature of the coaxial reverse rotating power mechanism is reduced, and the normal working of the coaxial reverse rotating power mechanism is prevented from being influenced by overhigh temperature.

3. According to the coaxial reverse power mechanism, one motor is utilized to synchronously drive two impellers positioned in different spraying working cavities to rotate, so that seawater is sucked from the radial direction through the attached suction port and the conduit suction port, excessive back pressure at the suction port can be avoided, the situation that when the seawater enters the self-stabilizing spraying pump, the moment in the vertical direction is generated on the whole anti-pirate near-side berthing device, the anti-pirate near-side berthing device is unstable, and the normal operation of the whole anti-pirate near-side berthing device is influenced; simultaneously, one motor drives two impellers to rotate simultaneously, so that the structure is more compact, the weight is lighter, and the situation that the normal use of the whole device is directly influenced by one motor fault in the background art can be avoided.

4. According to the seawater suction inlet of the bow-stern jet outer sleeve, the extending suction inlet is arranged at the lower end of the bow-stern jet outer sleeve, so that the seawater suction inlet of the bow-stern jet outer sleeve can be extended to a certain depth below the water surface, oil or garbage floating on the water surface is prevented from being sucked into the pump body to affect the operation of the pump body, and meanwhile, the influence of water flow wave disturbance on the water surface between two ships during the ship docking on the flow of the suction inlet is also prevented; and the filtering suction port of the extending suction port is arranged to be conical, so that the impact of the water surface when the pirate near-board berthing device is defended to be put into water can be reduced, and the effect of reducing the impact resistance of the water surface is achieved.

5. According to the anti-piracy jet pump, the reaction type release device is arranged on the extension type suction port at the lower end of the bow-stern jet outer sleeve, the locking release bolt is connected to the connecting flange of the extension type suction port and the bottom flange of the bow-stern jet outer sleeve, the reaction type release device is connected with the locking release bolt through the air pressure conducting pipe, and the extension type suction port is locked in a compressed state by the cooperation of the reaction type release device and the locking release bolt before the anti-piracy jet pump is put into seawater, so that the seawater resistance can be further reduced, and the anti-piracy jet pump is immersed in the seawater rapidly; in the process that the reaction type release device contacts the water surface and sinks into the water, seawater enters the reaction cylinder and chemically reacts with chemical materials in the cylinder to generate gas with certain pressure, the gas enters the locking release bolt through the air pressure conducting pipe to force the locking release bolt to be opened, so that the reaction type release device automatically drops off, and the extension type suction port automatically stretches to a free length state under the gravity action of the anti-impact cap after the restraint is released, so that the filtering suction port is placed at a certain depth below the water surface, the influence on the operation of the pump body caused by the oil suction pump floating on the water surface is avoided, and meanwhile, the influence on the flow of the suction port caused by the water flow wave disturbance between two ships during the ship docking can be avoided.

6. According to the centrifugal pump, the second impeller is arranged to be a specially-made centrifugal impeller, and when the centrifugal impeller rotates to work, a high-pressure area can be formed in the guide cylinder of the centrifugal impeller, so that seawater below the centrifugal suction port is guided to flow through the centrifugal suction port, and stable jet flow is provided for the bow-stern jet working cavity; simultaneously under the effect that the high-pressure area that forms in the draft tube is led the sea water below the centrifugal suction port, the space between the upper surface of baffle and the coaxial reversing mechanism can form the low-pressure area, in order to eliminate this low-pressure area, this application is provided with a plurality of overflow holes on the face that is close to the reversing transmission pole of baffle, can make the sea water below the baffle directly upwards flow from the overflow hole, not only eliminated the low-pressure area effectively, and the sea water from the overflow hole direct outflow can also increase the liquid flow of coaxial reversing mechanism bottom moreover, further cools down it.

7. When the spout working flow of the marine anti-pirate near-side berthing device is reduced, partial seawater flow can flow back to the lower part of the baffle through the overflow hole, the liquid flow in the guide cylinder cannot be influenced, the liquid flowing back to the guide cylinder can flow out again through the centrifugal outlet, then the circulating flow is between the baffle and the coaxial reversing mechanism, meanwhile, the seawater flow can flow back to the lower part of the baffle through the overflow hole, excessive internal pressure accumulation in a gap between the upper surface of the baffle and the coaxial reversing mechanism can be prevented, the buffer balance effect is achieved, and the integral stability of the centrifugal impeller can be facilitated.

8. According to the jet flow control device, the second impeller is arranged in the transition cylinder of the bow-stern jet outer sleeve, and the second impeller is matched with the transition cylinder, so that the influence of jet flow change in the bow-stern direction on the rotation speed of the second impeller and the rotation speed of the reversing transmission rod can be avoided.

9. The invention can also be used for emergency scenes such as fire fighting of ship water surface fuel oil fire or docking of LNG ship and TST ship, and the application is very wide.

10. The device can be also used for special occasions such as water surface fire caused by port crude oil leakage and the like to form continuous fire control injection, spray and disperse water surface fuel oil or flame, and also serve as a rapid suction type drainage pump; the device can be deployed at a side position during the berthing of naval water surface vessels, and the injected jet flow is utilized to interfere the water surface and the underwater so as to prevent underwater frogmans from attacking the vessels.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of the structure of the jet pump of the present invention.

Fig. 2 is a cross-sectional view taken along line C-C in fig. 1.

Fig. 3 is a sectional view taken along the direction B-B in fig. 1.

Fig. 4 is a cross-sectional view taken along A-A in fig. 1.

Fig. 5 is a cross-sectional view of the coaxial inversion mechanism in the jet pump.

Fig. 6 is a top view of the coaxial inversion mechanism in the jet pump.

Fig. 7 is a schematic structural view of a second impeller in the jet pump.

Fig. 8 is a longitudinal sectional view of a second impeller in the jet pump.

Fig. 9 is one of the top views of the second impeller in the jet pump.

Fig. 10 is a second schematic view of the structure of the second impeller in the jet pump.

Fig. 11 is a second longitudinal sectional view of a second impeller in the jet pump.

Fig. 12 is a schematic view of the return flow of seawater from overflow apertures.

Fig. 13 is a schematic illustration of the connection between the guide cylinder and the centrifugal guide plate in the jet pump.

Fig. 14 is a schematic view of the structure of the bow-stern jet outer sleeve in the jet pump.

Fig. 15 is a schematic view of the self-steady state of the jet pump.

Figure 16 is a schematic view of the extensible mouthpiece changing from a compressed state to an extended state.

Fig. 17 is a state diagram of the use of the jet pump.

Fig. 18 is a schematic structural view of the lock release pin in a locked state.

Fig. 19 is a schematic structural view of the lock release pin in an open state.

FIG. 20 is a schematic view of a reactive release and a locking release bolt from locking to self-shedding on an extended suction opening.

Fig. 21 is a schematic structural view of the closed state of the reactive release device.

Fig. 22 is a schematic structural view of the opened state of the reactive release device.

Fig. 23 is a schematic structural view of the reset state of the reactive release device.

The meaning of the reference numerals in the figures is:

1 is an outer sleeve for spraying heads and stern; 1.1 is a stem and stern jet orifice; 1.2 is a transition cylinder; 1.3 is an upper cylinder; 1.4 is a lower cylinder;

2 is an outboard jet inner sleeve; 2.1 is an outboard jet port;

3.1 is a first impeller; 3.2 is a second impeller; 3.2a is a guide cylinder; 3.2b is a baffle; 2b1 is an overflow aperture; 3.2c is a centrifugal baffle; 3.2d is a centrifugal suction port; 3.2e is a centrifugal outlet; 3.2f is a cylinder; 3.2g is an arc transition section;

4 is an extension type suction port;

4.1 is a connecting flange;

4.2 is a hose; 4.2a is a reinforcing ring;

4.3 is a filtering suction port; 4.3a is a baffle ring; 4.3b is a hollowed-out conical housing; 4.3c is a filter screen; 4.3d is an anti-impact cap;

4.4 is a lock release bolt; 4.4a is a bolt sleeve; 4.4b is a plug; 4.4c is an annular groove; 4.4d is an annular protrusion; 4.4e is a first connection port;

4.5 is an air pressure conduction pipe;

4.6 is a reactive release device; 4.6a is an impingement hood; 4.6b is a reaction cylinder; 4.6c is a second connection port; 4.6d is a clamping groove; 4.6e is a spool; 4.6f is a one-way valve plate; 4.6g of chemical material;

5 is a coaxial reversing mechanism;

6 is a driving mechanism; 6.1 is a fixed plate; 6.2 is a driving housing; 6.3 is a driving motor;

7 is a duct suction opening;

8 is a forward rotation transmission rod; 8.1 is a forward rotation output gear; 8.2 is a transmission gear; 8.3 is a fixed rod;

9 is a reversing transmission rod; 9.1 is a reversing output gear;

10 is a shaft seal;

11 is an outer plate;

12 is the water surface.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention is described below by means of specific embodiments shown in the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.

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

It should be understood that, although the terms first, second, third, etc. may be used in this disclosure to describe various information, these information should not be limited to these terms, but rather should not be construed as indicating or implying any relative importance. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context.

In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.

In the following description, suffixes such as "module", "component", or "unit" for representing elements are used only for facilitating the description of the present invention, and are not of specific significance per se. Thus, "module" and "component" may be used in combination.

For a better understanding of the technical solution of the present invention, the following detailed description of the present invention refers to the accompanying drawings.

The invention provides a pirate-proof connection jet pump with a reactive self-release suction port, which is connected with an ejector sleeve of a marine pirate-proof near-side berthing device and is used for providing jet flow in the side direction for the ejector sleeve. The jet pump and the jet stack are carried by a pulley bracket assembly.

The marine anti-pirate near-side berthing device is arranged on the ship side and is used for injecting water flow to the pirates when the pirate yacht is found to approach the ship, so that the purposes of disturbing and preventing the pirates from approaching the ship or logging in the ship are achieved, and the pirate yacht is driven away.

The injector suite of the marine anti-pirate near-side berthing device consists of a throttle valve group (or a flow control valve), a cable and an outboard injection pipe. The throttle valve group (or flow control valve) is used together with the self-stabilizing injection pump, and can be respectively regulated by a controller and used for regulating the jet flow of the outboard injection pipe. The number of the outboard jet pipes is 3, and the outboard jet pipes are uniformly distributed at 45 degrees along the outboard horizontal direction of the ship.

The pulley bracket assembly consists of a buoyancy block, a pulley bracket and a pulley, and the whole assembly plays a role in bearing and guiding the ejector sleeve and the ejector pump.

The injector suite and the pulley bracket assembly of the marine anti-pirate near-side berthing device are all existing structural members and are not described in detail herein.

The jet pump comprises a bow-stern jet outer sleeve 1, an outboard jet inner sleeve 2 nested in the upper part of the inside of the bow-stern jet outer sleeve 1, and a coaxial reversing power mechanism for sucking seawater into the bow-stern jet outer sleeve 1 and the outboard jet inner sleeve 2 at the same time so as to jet the seawater from the side of the ship and the direction of the bow-stern at the same time, wherein a forward rotating part of the coaxial reversing power mechanism is arranged in the outboard jet inner sleeve 2, and a reversing part is arranged in the bow-stern jet outer sleeve 1.

The upper end of the bow-stern jet outer sleeve 1 horizontally extends out of two bow-stern jet ports 1.1 with the same diameter, and the lower end flange of the bow-stern jet outer sleeve 1 is connected with an extension type suction port 4. Specifically, the stem and stern injection outer sleeve 1 comprises an upper cylinder 1.3, a lower cylinder 1.4 and a transition cylinder 1.2 which is connected between the upper cylinder 1.3 and the lower cylinder 1.4 and is in an inverted cone shape, the stem and stern injection orifice 1.1 is arranged at the upper end of the upper cylinder 1.3, and the extension type suction port 4 is arranged at the lower end of the lower cylinder 1.4. The diameter of the upper cylinder 1.3 is 2 times the diameter of the lower cylinder 1.4.

The extended suction port 4 is used for extending the suction port of the bow-stern jet outer sleeve 1 to a certain depth below the water surface so as to prevent oil floating on the water surface from being sucked into the pump to influence the operation of the pump body, and meanwhile, the influence of water flow wave disturbance between two ships on the flow of the suction port of the ship during the ship docking can be avoided. The extension type suction port 4 comprises a connecting flange 4.1 fixed with a flange at the bottom of the bow-stern spraying outer sleeve 1, a hose 4.2 fixed with the connecting flange 4.1, and a filtering suction port 4.3 fixed at the end part of the hose 4.2 and used for filtering water surface floaters or impurities in water and avoiding water surface wave disturbance from affecting the flow of the suction port.

The outer surface of the hose 4.2 is provided with a reinforcing ring 4.2a in the circumferential direction and the axial direction so as to strengthen the pipe body structure and prevent the pipe body from bending deformation when the jet pump is placed in water. The length of the hose 4.2 is set in dependence on the pump set power of the jet pump, preferably without affecting the pump set suction flow. The hose 4.2 serves to isolate floats on the water surface and to avoid water surface wave disturbances affecting the suction inlet flow.

The length of the hose 4.2 is telescopic, and in a normal use state, the hose 4.2 is in an extension state, and when the hose is in the extension state, the diameter of the hose is similar to the diameter of the lower cylinder 1.4 of the bow-stern jet outer sleeve 1, so that the effective flow cross section area of sucked seawater is ensured. When not in use, the length can be contracted to the minimum for storage.

The filtering suction port 4.3 comprises a baffle ring 4.3a fixed at the end part of the hose 4.2, a hollowed-out conical housing 4.3b fixed on the lower surface of the baffle ring 4.3a, a filter screen 4.3c arranged at the hollowed-out part of the hollowed-out conical housing 4.3b, and an anti-impact cap 4.3d fixed at the center of the bottom of the hollowed-out conical housing 4.3 b. The baffle ring 4.3a is used for fixing the hose 4.2 and the hollowed-out conical housing 4.3b into a whole, and the baffle ring 4.3a can be welded and fixed at the bottom of the hose 4.2 or can be fixed at the bottom of the hose 4.2 through other connection modes.

In this embodiment, the hollowed-out conical housing 4.3b is a conical housing structure composed of a plurality of housing rods fixed to the baffle ring 4.3a and the anti-impact cap 4.3d, the plurality of housing rods are uniformly distributed in the circumferential direction, one end of each housing rod is connected to the anti-impact cap 4.3d, and the other end is connected to the baffle ring 4.3 a. The hollow-out conical housing 4.3b can also be designed as other conical housing structures.

By arranging the filtering suction port 4.3 of the extending suction port 4 to be conical, the impact of the water surface when the anti-pirate near-board berthing device is put into water can be reduced, and the effect of reducing the impact resistance of the water surface can be achieved.

In this embodiment, the anti-impact cap 4.3d is made of cylindrical solid metal, so as to ensure that the extension type suction port 4 falls into water and the length thereof can be restored to a free length state under the gravity action of the anti-impact cap 4.3d when being released, and can also be used as a mounting base of the hollow conical housing 4.3b of the structure.

The connecting flange 4.1 and the bottom flange of the bow-stern injection outer sleeve 1 are not only fastened and connected through common bolts and nuts, but also are fixedly connected with a locking release bolt 4.4. The bottom of the filtering suction port 4.3 is also provided with a reactive release device 4.6, and the reactive release device 4.6 is communicated with the locking release bolt 4.4 through an air pressure conduction pipe 4.5, when the anti-piracy connection jet pump is slowly thrown into water, seawater enters the reactive release device 4.6 and reacts with chemical materials packaged in the anti-piracy connection jet pump to generate gas, and the gas is conveyed to the locking release bolt 4.4 through the air pressure conduction pipe 4.5 so that the locking release bolt 4.4 is opened under the action of air pressure, so that the reactive release device 4.6 and the air pressure conduction pipe 4.5 fall off from the bottom of the filtering suction port 4.3.

Specifically, the locking release bolt 4.4 comprises a bolt sleeve 4.4a which is inserted into the bottom flange and the connecting flange 4.1 of the bow-stern injection outer sleeve 1 from the lower side, and a plug 4.4b which is inserted into the bolt sleeve 4.4a from the upper side, wherein a plurality of annular grooves 4.4c which are uniformly distributed from the upper side are arranged on the inner wall of the bolt sleeve 4.4a, a plurality of annular protrusions 4.4d which are corresponding to the annular grooves 4.4c and are clamped in the annular grooves 4.4c are arranged on the outer wall of the plug 4.4b, a first connecting port 4.4e which is communicated with the inner cavity of the plug sleeve 4.4a is arranged at the head of the plug sleeve 4.5, and one end part of the air pressure conducting pipe 4.5 is fixed in the first connecting port 4.4 e.

The reaction type release device 4.6 comprises an impact shield 4.6a, a reaction cylinder 4.6b fixed in the impact shield 4.6a, and a second connection port 4.6c arranged at the upper end of the outer wall of the impact shield 4.6 a. The top of the reaction cylinder 4.6b is provided with a clamping groove 4.6d for clamping the whole reaction type release device 4.6 at the bottom of the filtering suction port 4.3, the centers of a top plate and a bottom plate of the reaction cylinder 4.6b are connected with a valve column 4.6e, a one-way valve plate 4.6f is sleeved on the valve column 4.6e, a valve port (not shown in the figure) is formed in the bottom plate of the reaction cylinder 4.6b below the one-way valve plate 4.6f, the area of the valve port is smaller than that of the one-way valve plate 4.6f, and chemical materials 4.6g are preset in the reaction cylinder 4.6 b. One end of the air pressure conducting pipe 4.5 is fixed on the second connecting port 4.6c, the second connecting port 4.6c is communicated with the inner cavity of the reaction cylinder 4.6b, chemical material 4.6g in the reaction cylinder 4.6b and seawater entering the cylinder from the valve port are subjected to chemical reaction to generate gas, and the gas enters the locking release bolt 4.4 through the second connecting port 4.6c and the air pressure conducting pipe 4.5 to enable the locking release bolt 4.4 to be opened under the action of gas pressure.

In this embodiment, the chemical material 4.6g in the reaction cylinder 4.6b is a binary reaction material pack, for example, sodium bicarbonate and acid medicine pack. When seawater is pushed against the one-way valve plate 4.6f to move upwards, the valve port of the reaction cylinder 4.6b is opened, the seawater enters the cylinder from the valve port to react with sodium bicarbonate and acid medicine bag, the sodium bicarbonate and the acid medicine bag are mixed with water to generate carbon dioxide gas, and the carbon dioxide gas enters the air pressure conducting pipe 4.5 from the second connecting port 4.6c and flows into the locking release bolt 4.4 through the air pressure conducting pipe 4.5; after the carbon dioxide gas is discharged, the one-way valve plate 4.6f moves downwards to block the valve port, and the one-way valve plate 4.6f resets to close the valve port so as to ensure the pressure inside the reaction cylinder 4.6b to be stable.

When the pirate-preventing connection jet pump is not put into water, the hose 4.2 of the extension type suction port 4 at the lower end of the bow-stern jet outer sleeve 1 is in a compressed state, namely the whole extension type suction port 4 is in a compressed state, and the extension type suction port 4 can be maintained in a compressed state because the reaction type release device 4.6 is clamped and fixed at the bottom of the filtering suction port 4.3 of the extension type suction port 4 (the reaction type release device 4.6 is clamped on the anti-impact cap 4.3 d) and the air pressure conduction pipe 4.5 connected with the upper end of the reaction type release device is fixed with the locking release bolt 4.4; when the anti-pirate connection jet pump is put in a lifting mode (namely, slowly contacts the water surface and drops into water), the one-way valve plate 4.6f moves upwards under the action of water surface pressure, the valve port of the reaction type release device 4.6 is opened, seawater enters the cylinder body of the reaction cylinder 4.6b from the valve port and chemically reacts with chemical material 4.6g in the cylinder, so that gas with certain pressure is generated, the gas enters the air pressure conducting tube 4.5 from the second connecting port 4.6c, flows into the locking release bolt 4.4 through the air pressure conducting tube 4.5, under the action of the air pressure, the plug 4.4b of the locking release bolt 4.4 is separated from the plug sleeve 4.4a, the plug sleeve 4.4a drops from the bottom flange of the stern jet outer sleeve 1 and the connecting flange 4.1, the whole reaction type release device 4.6 is connected with the hydraulic pressure to the pipe 4.5 to drop from the bottom of the filter suction port 4.3, after the constraint is relieved, the hose 4.2 automatically extends to the length of the hose 4.2 under the action of the gravity of the anti-impact cap 4.3d, so that the length of the hose 4.2 can be automatically extended to the suction port 4.3 under the action of the impact on the water surface of the ship, the water surface of the ship can be prevented from being influenced, and the impact on the water surface of the ship can be prevented from being caused, and the impact on the water surface of the ship, and the running state of the ship can be prevented from the impact on the water surface of the suction pump can be simultaneously caused.

The inner outboard injection sleeve 2 is sleeved in the outer bow-stern injection sleeve 1, the upper end of the inner outboard injection sleeve 2 extends out of the top of the outer bow-stern injection sleeve 1 vertically upwards, and the end opening of the extending section of the inner outboard injection sleeve is used as an outboard injection port 2.1 for providing stable injection flow for an outboard injection pipe of the injector suite. The lower end of the outboard jet inner sleeve 2 is obliquely extended downwards along the radial direction to form a plurality of conduit suction openings 7 which are uniformly distributed along the circumferential direction, the conduit suction openings 7 extend out of the fore-aft jet outer sleeve 1, namely, the conduit suction openings 7 are uniformly distributed on the circumference of the outboard jet inner sleeve 2 in an annular array, and are converged and gathered at the bottom of the outboard jet inner sleeve 2 and are integrated with the outboard jet inner sleeve. In this embodiment, the bottom circumference of the outboard jet inner sleeve 2 is provided with 8 conduit suction openings 7.

Because the outboard jet inner sleeve 2 is sleeved in the bow-stern jet outer sleeve 1, and the duct suction opening 7 of the outboard jet inner sleeve extends out of the bow-stern jet outer sleeve 1, a bow-stern jet working cavity is formed between the outboard jet inner sleeve 2 and the bow-stern jet outer sleeve 1, and an outboard jet working cavity independent of the outboard jet inner sleeve 2 is formed inside the outboard jet inner sleeve 2. Sea water sucked by the attachment suction port 4 enters the ejector sleeve through the bow-stern jet working cavity from the bow-stern jet port 1.1, and sea water sucked by the conduit suction port 7 enters the ejector sleeve through the outboard jet working cavity from the outboard jet port 2.1 thereof and is jetted from the outboard jet pipe of the ejector sleeve.

Meanwhile, as the forward rotating part of the coaxial reverse rotating power mechanism is positioned in the outboard injection inner sleeve 2, and the reverse rotating part passes through the bottom of the outboard injection inner sleeve 2 and then is positioned in the bow-stern injection outer sleeve 1, seawater flowing in the outboard injection working cavity and the bow-stern injection working cavity can cool the forward rotating part and the reverse rotating part of the coaxial reverse rotating power mechanism respectively, so that the working temperature of the coaxial reverse rotating power mechanism is reduced, and the normal work of the coaxial reverse rotating power mechanism is prevented from being influenced by overhigh temperature.

The coaxial reverse rotation power mechanism comprises a driving mechanism 6, a forward rotation transmission rod 8, a first impeller 3.1, a coaxial reverse rotation mechanism 5, a reverse rotation 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 a forward rotation portion of the coaxial reverse rotation power mechanism, and the coaxial reverse rotation mechanism 5, the reverse rotation transmission rod 9 and the second impeller 3.2 constitute a reverse rotation portion of the coaxial reverse rotation power mechanism.

The driving mechanism 6 is fixed in the outboard inner spraying sleeve 2, the output end of the driving mechanism 6 is connected with a vertically arranged forward rotation transmission rod 8, the first impeller 3.1 is arranged on the forward rotation transmission rod 8, the tail end of the forward rotation transmission rod 8 extends out of the bottom of the outboard inner spraying sleeve 2 and is in transmission connection with a coaxial reversing mechanism 5 fixed at the bottom of the outboard inner spraying sleeve 2, the output end of the coaxial reversing mechanism 5 is vertically connected with a reversing transmission rod 9 coaxial with the forward rotation transmission rod 8, the second impeller 3.2 is arranged on the reversing transmission rod 9, and the tail end of the reversing transmission rod 9 is fixed at the bottom of the bow-stern outer spraying sleeve 1.

Specifically, the driving mechanism 6 comprises a driving housing 6.2 fixed in the outboard jet inner sleeve 2 through a fixing plate 6.1 and a driving motor 6.3 arranged in the driving housing 6.2, wherein the output end of the driving motor 6.3 is connected with a forward rotation transmission rod 8, and a cable of the driving motor 6.3 sequentially penetrates through the driving housing 6.2 and the outboard jet opening 2.1 of the outboard jet inner sleeve 2 and then is connected with a controller of the marine pirate-preventing near-board berthing device. In this embodiment, the driving housing 6.2 is fixed in the middle of the sleeve at the upper part of the outboard jet inner sleeve 2 by 4 fixing plates 6.1 horizontally arranged, and the 4 fixing plates 6.1 are symmetrically arranged. The drive housing 6.2 can achieve a watertight sealing effect.

The coaxial reversing mechanism 5 comprises a mechanism shell, a forward rotation output gear 8.1, a reverse rotation output gear 9.1 and a transmission gear 8.2, wherein the forward rotation output gear 8.1, the reverse rotation output gear 9.1 and the transmission gear 8.2 are arranged in the mechanism shell, a forward rotation transmission rod 8 penetrates through the mechanism shell and is connected with the forward rotation output gear 8.1, the forward rotation output gear 8.1 is meshed with a plurality of transmission gears 8.2 uniformly and symmetrically arranged on the outer circumference of the forward rotation output gear 8.1, two adjacent transmission gears 8.2 are connected through a fixing rod 8.3, and the reverse rotation output gear 9.1 wraps the plurality of transmission gears 8.2 to be meshed with the transmission gears 8.2. The mechanism shell is fixed at the bottom of the outboard jet inner sleeve 2 and plays a role in waterproof sealing. The forward output gear 8.1 is configured to output a forward torque, and the transmission gear 8.2 is configured to transmit a torque such that the rotational direction of the reverse output gear 9.1 is opposite to that of the forward output gear 8.1. In the embodiment, the bottom of the mechanism shell is conical; the reversing output gear 9.1 is U-shaped, teeth are arranged on the inner wall of the reversing output gear, and the reversing transmission rod 9 vertically upwards passes through the mechanism shell and is fixed at the bottom of the reversing output gear 9.1.

The rotation direction of the reverse rotation transmission rod 9 is opposite to the rotation direction of the forward rotation transmission rod 8. A plurality of first impellers 3.1 are uniformly fixed on the forward rotation transmission rod 8 from top to bottom, and a second impeller 3.2 is fixed on the reverse rotation transmission rod 9.

The first impeller 3.1 and the second impeller 3.2 may each be provided as an axial flow impeller or as a centrifugal impeller. Or the first impeller 3.1 is provided as an axial flow impeller and the second impeller 3.2 is provided as a centrifugal impeller.

The centrifugal impeller comprises a guide cylinder 3.2a sleeved outside the reversing transmission rod 9 but not in contact with the reversing transmission rod 9, a baffle plate 3.2b fixed on the reversing transmission rod 9 and flush with the upper edge of the guide cylinder 3.2a, and a centrifugal guide plate 3.2c for connecting the guide cylinder 3.2a and the baffle plate 3.2 b.

An annular centrifugal suction port 3.2d is formed between the lower edge of the guide cylinder 3.2a and the reversing transmission rod 9, and an annular centrifugal outlet 3.2e is formed between the upper edge of the guide cylinder and the outer circumference of the baffle plate 3.2 b. The guide cylinder 3.2a consists of a cylinder body 3.2f and a trumpet-shaped arc transition section 3.2g which extends downwards from the lower edge of the cylinder body 3.2 f.

The guide shell 3.2a is connected with the baffle 3.2b through a plurality of centrifugal guide plates 3.2c. A plurality of centrifugal baffles 3.2c are fixed in the guide cylinder 3.2a around the reversing transmission rod 9 at certain deflection angle intervals deviating from the radial direction and are fixed perpendicularly to the baffle plate 3.2b, and the deflection direction of the centrifugal baffles 3.2c is opposite to the rotation direction of the reversing transmission rod 9. The lower edge of the centrifugal guide plate 3.2c is attached and fixed with the arc-shaped transition section 3.2g of the guide cylinder 3.2a, one part of the upper edge is fixed with the baffle plate 3.2b, and the side edge deviating from the reversing transmission rod 9 is fixed with the inner wall of the cylinder body 3.2f of the guide cylinder 3.2 a. The contact connection part between the lower edge of the centrifugal guide plate 3.2c and the arc-shaped transition section 3.2g of the guide cylinder 3.2a is kept watertight.

The diameter of the baffle 3.2b is larger than the diameter of the centrifugal suction port 3.2d and smaller than the diameter of the cylinder 3.2 f. In this embodiment, the baffle 3.2b is a trapezoid plate.

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

When the centrifugal impeller rotates to work, the centrifugal guide plate 3.2c rotates synchronously along with the guide cylinder 3.2a and the baffle plate 3.2b, so that a high-pressure area is formed in the guide cylinder 3.2a, seawater enters the centrifugal impeller from the centrifugal suction port 3.2d, flows upwards from the centrifugal outlet 3.2e along the centrifugal guide plate 3.2c under the guide action of the centrifugal guide plate 3.2c, and meanwhile, the seawater below the centrifugal suction port 3.2d can be drained.

When the centrifugal impeller rotates, under the action of the high-pressure area formed in the guide cylinder 3.2a for guiding seawater below the centrifugal suction port 3.2d, a low-pressure area is formed in a gap between the upper surface of the baffle plate 3.2b and the coaxial reversing mechanism 5, and a plurality of overflow holes 3.2b1 uniformly distributed in the circumferential direction are formed in the plate surface, close to the reversing transmission rod 9, of the baffle plate 3.2b for eliminating the low-pressure area.

The diameter of the circle in which the plurality of overflow holes 3.2b1 are located is smaller than 1/2 of the diameter of the suction opening of the centrifugal suction opening 3.2 d. And the aperture and the number of the overflow holes 3.2b1 are designed according to the full load flow rate of the centrifugal impeller, in the embodiment, the sum of the fluid flow rates of all the overflow holes 3.2b1 is not more than 5% of the full load flow rate of the centrifugal impeller.

By arranging the overflow holes 3.2b1 on the baffle plate 3.2b, the seawater below the baffle plate 3.2b can directly flow out from the overflow holes 3.2b1, so that a low-pressure area is eliminated, and the seawater directly flowing out from the overflow holes 3.2b1 can also increase the liquid flow at the bottom of the coaxial reversing mechanism 5, so that the temperature of the seawater is further reduced.

Meanwhile, when the working flow of the nozzle of the marine anti-pirate near-side berthing device is reduced, part of seawater flow can flow back to the lower part of the baffle plate 3.2b through the overflow hole 3.2b1, the liquid flow in the guide cylinder 3.2a cannot be influenced, the liquid flowing back to the guide cylinder 3.2a can flow out again through the centrifugal outlet 3.2e, then flows back to the space between the baffle plate 3.2b and the coaxial reversing mechanism 5, meanwhile, the seawater flow can flow back to the lower part of the baffle plate 3.2b through the overflow hole 3.2b1, excessive internal pressure is accumulated in a gap between the upper surface of the baffle plate 3.2b and the coaxial reversing mechanism 5, the buffer balance effect is achieved, and the integral stability of the centrifugal impeller can be facilitated.

In this embodiment, the first impeller 3.1 is an axial flow impeller, the axial flow impeller is an impeller formed by adopting a plurality of groups of rotary paddles, the second impeller 3.2 is a centrifugal impeller, the first impeller 3.1 is used for providing stable flow to the outboard jet working chamber, and the second impeller 3.2 is used for providing stable flow to the fore-aft jet working chamber. The second impeller 3.2 is arranged in the transition cylinder 1.2 of the bow-stern injection outer sleeve 1, and the second impeller 3.2 is matched with the transition cylinder 1.2, so that the influence of jet flow change in the bow-stern direction on the rotation speed of the second impeller 3.2 and the rotation speed of the reversing transmission rod 9 can be avoided.

When the coaxial reverse rotation power mechanism works, the driving motor 6.3 drives the forward rotation transmission rod 8 to rotate, the first impeller 3.1 rotates to suck external seawater into the outboard jet working cavity of the outboard jet inner sleeve 2 from the guide pipe suction port 7, then the external seawater enters the ejector sleeve 11 from the outboard jet port 2.1, and finally the external seawater is ejected from the outboard jet pipe of the ejector sleeve 11; meanwhile, the forward rotation transmission rod 8 drives the forward rotation output gear 8.1 to rotate, and as the forward rotation output gear 8.1 is meshed with the transmission gear 8.2 and the transmission gear 8.2 is meshed with the reverse rotation output gear 9.1, power is transmitted to the reverse rotation output gear 9.1, the reverse rotation output gear 9.1 drives the reverse rotation transmission rod to rotate reversely, so that the second impeller 3.2 and the first impeller 3.1 rotate synchronously, and the second impeller 3.2 sucks external seawater from the attached suction port 4 into a fore-aft injection working cavity of the fore-aft injection outer sleeve 1, and then injects the external seawater from the fore-aft injection working cavity of the fore-injection outer sleeve 1.1.

The forward rotation transmission rod 8 is provided with a shaft seal 10 at a position penetrating from the bottom of the driving housing 6.2 and the outboard jet inner sleeve 2 of the driving mechanism 6, and the reverse rotation transmission rod 9 is also provided with a shaft seal 10 at a position penetrating from the bottom of the mechanism housing and the bow-stern jet outer sleeve 1 of the coaxial reverse rotation mechanism 5.

Because the self-stabilizing jet pump of this application is provided with inside and outside two injection working chambers, two seal structures (the drive housing 6.2 of actuating mechanism 6, coaxial reverse rotation mechanism 5), and forward rotation transfer line 8 and reverse rotation transfer line 9 are coaxial setting, consequently, all need set up shaft seal 10 when two transfer lines pass cavity and seal structure, play waterproof sealing effect when guaranteeing the normal work of each moving part of motor, pump.

Before the self-stabilizing jet pump is used, debugging is needed, and the self-stabilizing jet pump comprises the following points:

a. confirming whether the rotation speeds of the first impeller 3.1 rotating positively and the second impeller 3.2 rotating negatively are the same or not so as to ensure that the torques of the two groups of impellers in the idle state are kept consistent (M positive rotation=m negative rotation);

b. the self-stabilizing jet pump is placed in a test pool, after a driving motor 6.3 is started, flow states of a bow-stern jet working cavity and an outboard jet working cavity are respectively checked, so that the working flow required by the marine pirate prevention near-board berthing device is ensured to be met;

c. if the torques of the two groups of impellers are inconsistent in the test, the torques of the two groups of impellers are kept consistent by performing throttle control on the ejector sleeve member 11 in the marine pirate prevention near-side berthing device and synchronously increasing or reducing the flow of the bow-stern injection working cavity, so that the torque stability of the self-stabilizing injection pump is ensured.

When the self-stabilizing jet pump is used, the self-stabilizing jet pump comprises the following using steps:

step one: the reaction type release device 4.6 is fixed on an anti-impact cap 4.3d of an extension type suction port 4 at the lower end of the bow-stern jet outer sleeve 1, two locking release bolts 4.4 are arranged on a flange at the bottom of the bow-stern jet outer sleeve 1 and a connecting flange 4.1, and the two locking release bolts 4.4 are respectively connected with a second connecting port 4.6c at two sides of the reaction type release device 4.6 through an air pressure conducting pipe 4.5, and the extension type suction port 4 is in a compressed state at the moment;

step two: the anti-pirate connection jet pump is slowly put into water, the reaction type release device 4.6 contacts the water surface and sinks towards the water under the action of gravity, seawater enters the reaction cylinder 4.6b from the valve port of the reaction type release device and chemically reacts with chemical material 4.6g in the cylinder to generate gas with certain pressure, the gas flows into the locking release bolt 4.4 from the second connection port 4.6c and the air pressure conducting pipe 4.5, the locking release bolt 4.4 is opened under the action of the gas pressure, the reaction type release device 4.6 and the air pressure conducting pipe 4.5 drop from the anti-impact cap 4.3d, after the constraint is released, the length of a hose 4.2 of the extension type suction port 4 is automatically extended to a free length state under the action of gravity of the anti-impact cap 4.3d, and the filtering suction port 4.3 of the extension type suction port 4 is placed at a certain depth below the water surface;

After the pirate-preventing connection jet pump enters the water, under the action of water pressure, seawater enters the bow-stern jet outer sleeve 1 through the filtering suction port 4.3;

step three: starting a driving motor 6.3, driving the first impeller 3.1 and the second impeller 3.2 to synchronously rotate by the driving motor 6.3, sucking external seawater into an outboard jet working cavity of the outboard jet inner sleeve 2 from the conduit suction port 7 by the rotation of the first impeller 3.1, then entering the injector assembly 11 from the outboard jet port 2.1, and finally jetting from an outboard jet pipe of the injector assembly 11; simultaneously, the second impeller 3.2 rotates to suck external seawater into a bow-stern jet working cavity of the bow-stern jet outer sleeve 1 from the extension type suction port 4, and then the external seawater is jetted from the bow-stern jet orifice 1.1, so that the jet seawater can jet to push away the pirate yacht to interfere and prevent the near-side action of the pirate yacht, and finally the purpose of driving away the pirate yacht is achieved;

since the seawater is sucked from the radial direction through the butterfly suction port 4 and the conduit suction port 7, the moment in the vertical direction generated by the whole anti-pirate near-side berthing device when the seawater passes through the self-stabilizing jet pump can be avoided, and the anti-pirate near-side berthing device is unstable.

It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Claims (12)

1. A pirate connection prevention jet pump with a reaction type self-release suction port is characterized by comprising a bow-stern jet outer sleeve (1), an outboard jet inner sleeve (2) nested at the inner upper half part of the bow-stern jet outer sleeve (1), and a coaxial reversing power mechanism for sucking seawater into the bow-stern jet outer sleeve (1) and the outboard jet inner sleeve (2) simultaneously so as to jet the seawater from the side of the ship and the direction of the bow-stern simultaneously,

the upper end of the bow-stern jet outer sleeve (1) horizontally extends to form two bow-stern jet ports (1.1) in the same radial direction, the lower end flange of the bow-stern jet outer sleeve (1) is connected with an extending type suction port (4), a locking release bolt (4.4) is further arranged at the joint of the extending type suction port (4) and the lower end flange of the bow-stern jet outer sleeve (1), a reactive release device (4.6) is arranged at the bottom of the extending type suction port (4) and is communicated with the locking release bolt (4.4) through an air pressure conduction pipe (4.5), when the anti-piracy jet pump is slowly immersed in water, seawater enters the inside of the reactive release device (4.6) and reacts with chemical materials packaged in the anti-piracy jet pump to generate gas, the gas is conveyed to the locking release bolt (4.4) through the air pressure conduction pipe (4.5) so that the locking release bolt (4.4) is opened under the action of gas pressure, and the reactive release device (4.6) automatically drops from the bottom of the filtering suction port (4.3) to a free state;

The upper end of the outboard jet inner sleeve (2) vertically extends upwards from the top of the fore-aft jet outer sleeve (1), the end opening of the extending section of the outboard jet inner sleeve is used as an outboard jet port (2.1) connected with an outboard jet pipe of the marine anti-pirate near-board berthing device, the lower end of the outboard jet inner sleeve (2) radially and downwards inclines and extends to form a plurality of guide pipe suction ports (7) which are uniformly distributed in the circumferential direction, and the guide pipe suction ports (7) extend out of the fore-aft jet outer sleeve (1);

the forward rotating part of the coaxial reverse rotating power mechanism is arranged in the outboard jet inner sleeve (2), and the reverse rotating part is arranged in the bow-stern jet outer sleeve (1).

2. The pirate-connection-preventing jet pump with the reaction type self-release suction port according to claim 1, wherein the coaxial reverse rotation power mechanism comprises a driving mechanism (6), a forward rotation transmission rod (8), a first impeller (3.1), a coaxial reverse rotation mechanism (5) and a second impeller (3.2), the driving mechanism (6) is fixed in the outboard jet inner sleeve (2), the output end of the driving mechanism (6) is connected with the vertically arranged forward rotation transmission rod (8), the forward rotation transmission rod (8) is provided with the first impeller (3.1) and the tail end of the first impeller extends out from the bottom of the outboard jet inner sleeve (2) and is in transmission connection with the coaxial reverse rotation mechanism (5) fixed at the bottom of the outboard jet inner sleeve (2), the output end of the coaxial reverse rotation mechanism (5) is vertically connected with a reverse rotation transmission rod (9) coaxial with the forward rotation transmission rod (8), and the second impeller (3.2) is arranged on the reverse rotation transmission rod (9) and the tail end of the second impeller is fixed at the bottom of the bow-stern jet outer sleeve (1).

3. Anti-piracy jet pump with reactive self-releasing suction opening according to claim 2, characterized in that said coaxial reversing mechanism (5) comprises a mechanism housing and a forward output gear (8.1), a reverse output gear (9.1) and a transmission gear (8.2) arranged in the mechanism housing, the forward transmission lever (8) is connected with the forward output gear (8.1) through the mechanism housing, the forward output gear (8.1) is meshed with a plurality of transmission gears (8.2) uniformly and symmetrically arranged on the outer circumference thereof, two adjacent transmission gears (8.2) are connected by a fixed lever (8.3), and the reverse output gear (9.1) wraps the plurality of transmission gears (8.2) to be meshed with the transmission gears (8.2).

4. The anti-pirate connection jet pump with the reactive self-release suction port according to claim 2, wherein the driving mechanism (6) comprises a driving housing (6.2) fixed in the outboard jet inner sleeve (2) through a fixing plate (6.1) and a driving motor (6.3) arranged in the driving housing (6.2), the output end of the driving motor (6.3) is connected with a forward rotation transmission rod (8), and a cable of the driving motor (6.3) sequentially passes through the driving housing (6.2) and the outboard jet port (2.1) of the outboard jet inner sleeve (2) and then is connected with a controller of the marine anti-pirate proximal berthing device.

5. Anti-pirate connection jet pump with reactive self-releasing suction according to claim 2, characterized in that the first impeller (3.1) and the second impeller (3.2) are both axial-flow impellers or centrifugal impellers;

or the first impeller (3.1) is an axial flow impeller, and the second impeller (3.2) is a centrifugal impeller.

6. The anti-pirate connection jet pump with a reactive self-releasing suction port according to claim 5, wherein the centrifugal impeller comprises a guide cylinder (3.2 a) sleeved outside a reversing transmission rod (9) but not in contact with the reversing transmission rod (9), a baffle plate (3.2 b) fixed on the reversing transmission rod (9) and flush with the upper edge of the guide cylinder (3.2 a), and a centrifugal baffle plate (3.2 c) for connecting the guide cylinder (3.2 a) and the baffle plate (3.2 b), a plurality of centrifugal baffle plates (3.2 c) are fixed in the guide cylinder (3.2 a) around the reversing transmission rod (9) at specific deflection angle intervals deviating from the radial direction and are vertically fixed with the baffle plate (3.2 b), the deflection direction of the centrifugal baffle plate (3.2 c) is opposite to the rotation direction of the reversing transmission rod (9),

an annular centrifugal suction port (3.2 d) is formed between the lower edge of the guide cylinder (3.2 a) and the reversing transmission rod (9), and an annular centrifugal outlet (3.2 e) is formed between the upper edge of the guide cylinder and the outer circumference of the baffle plate (3.2 b).

7. The anti-pirate connection jet pump with the reactive self-release suction port according to claim 6, wherein the guide cylinder (3.2 a) is composed of a cylinder body (3.2 f) and an arc-shaped transition section (3.2 g) which is downwards extended from the lower edge of the cylinder body (3.2 f), the lower edge of the centrifugal guide plate (3.2 c) is fixedly attached to the arc-shaped transition section (3.2 g), a part of the upper edge of the centrifugal guide plate is fixedly attached to a baffle plate (3.2 b), the side edge of the baffle plate (3.2 b) deviating from the reversing transmission rod (9) is fixedly attached to the inner wall of the cylinder body (3.2 f), and the diameter of the baffle plate (3.2 b) is larger than the outer diameter of the coaxial reversing mechanism (5).

8. Anti-pirate connection jet pump with reactive self-releasing suction opening according to claim 1, characterized in that the bow-stern jet outer sleeve (1) comprises an upper cylinder (1.3), a lower cylinder (1.4) and a transition cylinder (1.2) connected between the upper cylinder (1.3) and the lower cylinder (1.4) in an inverted cone shape, the bow-stern jet opening (1.1) is arranged at the upper end of the upper cylinder (1.3), the extension suction opening (4) is arranged at the lower end of the lower cylinder (1.4), the second impeller (3.2) is arranged in the transition cylinder (1.2) to avoid the influence of the jet flow variation in the bow-stern direction on the rotation speed of the second impeller (3.2) and the reversing transmission rod (9).

9. Anti-piracy jet pump with reactive self-releasing suction opening according to claim 1, characterized in that said extension suction opening (4) comprises a connection flange (4.1) fixed to the flange at the bottom of the jet outer sleeve (1), a hose (4.2) fixed to the connection flange (4.1), and a filtering suction opening (4.3) fixed to the end of the hose (4.2) for filtering the surface floats or impurities in the water and avoiding the surface wave disturbance affecting the suction opening flow.

10. The pirate-prevention jet pump with the reactive self-release suction port according to claim 9, wherein the filtering suction port (4.3) comprises a baffle ring (4.3 a) fixed at the end part of the hose (4.2), a hollowed-out cone-shaped housing (4.3 b) fixed on the lower surface of the baffle ring (4.3 a), a filter screen (4.3 c) arranged at the hollowed-out part of the hollowed-out cone-shaped housing (4.3 b), and an anti-impact cap (4.3 d) fixed at the center of the bottom of the hollowed-out cone-shaped housing (4.3 b);

reinforcing rings (4.2 a) are arranged on the outer surface of the hose (4.2) in the circumferential direction and the axial direction, and the reactive release device (4.6) is clamped on the anti-impact cap (4.3 d).

11. The anti-pirate connection jet pump with the reactive self-release suction port according to claim 1 or 10, wherein the reactive release device (4.6) comprises an impact shield (4.6 a), a reaction cylinder (4.6 b) fixed in the impact shield (4.6 a) and a second connection port (4.6 c) arranged at the upper end of the outer wall of the impact shield (4.6 a), a clamping groove (4.6 d) for clamping the whole reactive release device (4.6) at the bottom of the filtering suction port (4.3) is arranged at the top of the reaction cylinder (4.6 b), a valve column (4.6 e) is connected at the center of the top plate and the bottom plate of the reaction cylinder (4.6 b), a one-way valve plate (4.6 f) is sleeved on the valve column (4.6 e), a valve port is arranged on the bottom plate of the reaction cylinder (4.6 b) below the one-way valve plate (4.6 f), the area of the one-way valve plate (4.6 f) is smaller than that of the one-way valve plate (4.6 f), the chemical valve port (4.6 g) material is preset inside the reaction cylinder (4.6 b),

One end of the air pressure conducting pipe (4.5) is fixed on the second connecting port (4.6 c), the second connecting port (4.6 c) is communicated with the inner cavity of the reaction cylinder (4.6 b), chemical materials (4.6 g) in the reaction cylinder (4.6 b) and seawater entering the cylinder from the valve port are subjected to chemical reaction to generate gas, and the gas enters the locking release bolt (4.4) through the second connecting port (4.6 c) and the air pressure conducting pipe (4.5) to enable the locking release bolt (4.4) to be opened under the action of gas pressure.

12. The pirate-prevention connection jet pump with the reaction type self-release suction port according to claim 1, wherein the locking release bolt (4.4) comprises a bolt sleeve (4.4 a) which is inserted into a bottom flange and a connecting flange (4.1) of the bow-stern jet outer sleeve (1) from below, a plug (4.4 b) which is inserted into the bolt sleeve (4.4 a) from above, a plurality of annular grooves (4.4 c) which are uniformly distributed from top to bottom are arranged on the inner wall of the bolt sleeve (4.4 a), a plurality of annular protrusions (4.4 d) which are clamped in the annular grooves (4.4 c) and correspond to the annular grooves (4.4 c) are arranged on the outer wall of the plug (4.4 b), a first connecting port (4.4 e) which is communicated with an inner cavity of the plug sleeve (4.4 a) is arranged at the head of the plug sleeve, and the other end part of the pneumatic conducting tube (4.5) is fixed in the first connecting port (4.4 e).