A water jet propulsion device and a double-surface watercraft

Abstract

The present invention discloses a water jet propulsion device, comprising a main body and a water jet device arranged in the main body, the water jet device comprising an engine, an impeller and an engine fixing frame, the engine is fixed inside the main body through the engine fixing frame, the impeller is located at the water outlet and connected to the engine output shaft, the main body has a plurality of water inlets and a water outlet, the plurality of water inlets are distributed on two water contacting surfaces, a water inlet cover is arranged at the water inlet, the water inlet cover comprises a cover sheet rotatable around an axis, a fixing fork and a driving device are arranged in the main body, the fixing fork is provided with a fork groove which can fork the cover sheet, the cover sheet can be forked and fixed by the fork groove when rotating around the axis to open the water inlet; also disclosed is a water surface water vehicle; the opening and closing states of the water inlets on the front and back sides of the life preserver can be automatically switched, thereby reducing the power loss of the unmanned vehicle and improving the operation efficiency of the water unmanned vehicle under harsh conditions.

Description

Technical Field

[0001] The present invention relates to the field of watercraft, and in particular to a water jet propulsion device and a double-surface watercraft. Background Art

[0002] In recent years, natural disasters have occurred frequently, and people have put forward higher requirements for the level of water rescue or investigation. Under harsh natural conditions, achieving efficient and strong wind and wave resistant water unmanned aerial vehicle rescue is still an urgent problem to be solved. Remote control life-saving double-sided water unmanned aerial vehicle is widely used in rescue sites as an efficient water rescue or investigation product. The double-sided water inlet spray pump structure of the double-sided water unmanned aerial vehicle remote control life-saving device is different from the single-sided water inlet of the unmanned lifeboat. Its double-sided opening spray pump structure enables the double-sided water unmanned aerial vehicle remote control life-saving device to be used on both sides. This feature enables the life-saving device to withstand strong winds and waves, and it can be used normally even if it is overturned by wind and waves. For example, Chinese patent CN201820000678.3 discloses a double-sided water vehicle, but the traditional double-inlet pump spray is in the open state when working, so the water inlet at the bottom of the water will suck in water, and the water inlet above the water surface will suck in air, causing a significant reduction in power. Summary of the invention

[0003] In view of the above-mentioned shortcomings that currently exist, the present invention provides a water jet propulsion device and a double-surface water vehicle, which only open the water inlet below the water surface to prevent air from entering from the water inlet above the water surface, greatly improve the pump jet efficiency, and improve the speed and stability of the double-surface water unmanned vehicle.

[0004] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0005] A water jet propulsion device, comprising a main body and a water jet device arranged in the main body, the water jet device comprising an engine, an impeller and an engine mounting bracket, the engine being fixed inside the main body through the engine mounting bracket, the impeller being located at the water outlet and connected to the engine output shaft, the main body having a plurality of water inlets and a water outlet, the plurality of water inlets being distributed on two water contacting surfaces, a water inlet cover being provided at the water inlet, the water inlet cover comprising a cover piece rotatable around an axis, a fixing fork and a driving device being provided inside the main body, the fixing fork being provided with a fork groove which can fork the cover piece, and the cover piece can be forked and fixed by the fork groove when rotating around the axis to open the water inlet.

[0006] According to one aspect of the present invention, the water inlet comprises at least two oppositely arranged water inlets, and the two oppositely arranged water inlets share a fixed fork, and the two ends of the common fixed fork are respectively provided with fork grooves, which can be moved back and forth under the drive of the driving device to fork the cover plates of the two water inlets respectively.

[0007] According to one aspect of the present invention, the driving device includes a fixed fork mounting member and a sliding assembly arranged on the fixed fork mounting member, the fixed fork is movably connected to the fixed fork mounting member through the sliding assembly, and the fixed fork can slide on the fixed fork mounting member under the action of gravity.

[0008] According to one aspect of the present invention, the driving device includes a fixed fork mounting member, a fixed fork anti-slip member, at least one electromagnet with changeable polarity and a magnet cooperating with the electromagnet, the fixed fork anti-slip member is slidably connected to the fixed fork mounting member, the fixed fork is fixed on the fixed fork anti-slip member, the fixed fork anti-slip member is fixedly provided with an electromagnet with changeable polarity or a magnet cooperating with the electromagnet, and the fixed fork mounting member is fixedly provided with a magnet cooperating with the electromagnet or an electromagnet with changeable polarity.

[0009] According to one aspect of the present invention, the driving device includes a fixed fork mounting member and a movable pair arranged on the fixed fork mounting member, the fixed fork is movably connected to the fixed fork mounting member through the movable pair, the fixed fork is connected to a steering gear through a transmission structure and moves on the fixed fork mounting member under the drive of the steering gear.

[0010] According to one aspect of the present invention, the water jet propulsion device includes a sensor and a control system, and the control system is connected to and controls the sensor and the driving device respectively.

[0011] According to one aspect of the present invention, the water inlet cover includes a cover plate mounting seat, which is arranged on the main body at the water inlet, and the cover plate is arranged between two cover plate mounting seats and forms a water inlet cover structure with the two cover plate mounting seats in which the cover plate can rotate around the axis.

[0012] According to one aspect of the present invention, a convex shaft is provided at the portion where the cover plate mounting seat is connected to the cover plate, and an axial hole matching the convex shaft is provided on the cover plate, or an axial hole is provided at the portion where the cover plate mounting seat is connected to the cover plate, and a convex shaft matching the axial hole is provided on the cover plate.

[0013] According to one aspect of the present invention, a cover plate anti-deflection structure is provided on the cover plate mounting seat.

[0014] According to one aspect of the present invention, the main bodies of the cover sheet edge and the water inlet edge are respectively provided with mutually cooperating devices that can make the cover sheet edge and the main body of the water inlet edge absorb or repel each other.

[0015] According to one aspect of the present invention, a rubber pad is provided on the main body contact surface between the edge of the cover sheet and the edge of the water inlet.

[0016] According to one aspect of the present invention, two cover sheets are provided at each water inlet, and the two cover sheets are rotated and closed by a fixed fork to open the water inlet.

[0017] According to one aspect of the present invention, the two cover sheets are respectively provided with structures that enable the two cover sheets to attract or repel each other.

[0018] A double-surface watercraft comprises a vehicle body with two water-contacting surfaces and at least one propulsion unit connected to the vehicle body, wherein the propulsion unit is provided with the water jet propulsion device as described above.

[0019] According to one aspect of the present invention, the aircraft body has two propulsion units, each of which is connected to a water jet propulsion device.

[0020] Advantages of the implementation of the present invention: The water jet propulsion device described in the present invention includes a main body and a water jet device arranged in the main body, the water jet device includes an engine, an impeller and an engine fixing frame, the engine is fixed inside the main body through the engine fixing frame, the impeller is located at the water outlet and is connected to the engine output shaft, the main body has a plurality of water inlets and a water outlet, the plurality of water inlets are distributed on two water contact surfaces, a water inlet cover is provided at the water inlet, the water inlet cover includes a cover sheet rotatable around an axis, a fixing fork and a driving device are provided in the main body, the fixing fork is provided with a fork groove that can fork the cover sheet, and the cover sheet can be forked by the fork groove when rotating around the axis to open the water inlet. The life preserver can be fixed; the opening and closing states of the water inlets on the front and back sides of the life preserver can be automatically switched, thereby reducing the power loss of the unmanned vehicle and improving the operating efficiency of the water unmanned vehicle under harsh conditions; compared with the traditional remote-controlled double-sided water unmanned vehicle whose two water inlets are both open, a large amount of air will enter from the water inlet above the water surface, resulting in low efficiency of the water jet propulsion. Under normal working conditions, the improved remote-controlled double-sided water unmanned vehicle only opens the water inlet below the water surface, avoiding the entry of air from the water inlet on the water surface, thereby improving the pump spray efficiency, increasing the speed and stability of the double-sided water unmanned vehicle, and improving the rescue capability of the remote-controlled double-sided water unmanned vehicle under harsh rescue conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the overall external structure of a water jet propulsion device according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic structural diagram of a water jet propulsion device according to Embodiment 1 of the present invention;

[0024] Figure 3 This is a schematic diagram of the cover plate structure according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the working principle of a water jet propulsion device according to Embodiment 1 of the present invention;

[0026] Figure 5 This is a schematic structural diagram of a water jet propulsion device according to the second embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the working principle of a water jet propulsion device according to the second embodiment of the present invention;

[0028] Figure 7 This is a schematic structural diagram of a water jet propulsion device according to Embodiment 3 of the present invention;

[0029] Figure 8 This is a schematic diagram of the structure of the driving device according to the third embodiment of the present invention;

[0030] Fig. 9 A schematic diagram of the working principle of a water jet propulsion device according to Embodiment 3 and Embodiment 4 of the present invention;

[0031] Fig.10 This is a schematic structural diagram of a water jet propulsion device according to a fourth embodiment of the present invention;

[0032] Fig.11 This is a schematic diagram of the structure of the driving device according to the fourth embodiment of the present invention;

[0033] Fig.12 This is a schematic structural diagram of a water jet propulsion device according to a fifth embodiment of the present invention;

[0034] Fig.13 This is a schematic diagram of the disassembled structure of a water jet propulsion device according to the fifth embodiment of the present invention;

[0035] Fig.14 This is a schematic diagram of the working principle of a water jet propulsion device according to Embodiment 5 of the present invention;

[0036] Fig.15 This is a schematic diagram of the structure of a double-surface watercraft described in Example 6 of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1

[0039] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a water jet propulsion device comprises a main body 1 and a water jet device 2 arranged in the main body, the water jet device comprises an engine 21, an impeller 22 and an engine mounting bracket 23, the engine is fixed inside the main body through the engine mounting bracket, the impeller is located at the water outlet and connected to the engine output shaft, the main body has a plurality of water inlets 11 and a water outlet 12, the plurality of water inlets are distributed on two water contact surfaces, a water inlet cover 3 is arranged at the water inlet, the water inlet cover comprises a cover sheet 31 that can rotate around an axis, a fixing fork 4 and a driving device 5 are arranged in the main body, the fixing fork is provided with a fork groove 41 that can fork the cover sheet, and the cover sheet can be forked and fixed by the fork groove when rotating around the axis to open the water inlet. Wherein, the driving device comprises a fixing fork mounting member 51 and a sliding assembly 52 arranged on the fixing fork mounting member, the fixing fork is movably connected to the fixing fork mounting member through the sliding assembly, and the fixing fork can slide on the fixing fork mounting member under the action of gravity. The forked cover piece can be used as the tail wing of the aircraft when the water jet propulsion device pushes the aircraft to sail, which can increase the navigation stability of the aircraft. The function of the fixed fork and the fork groove is to lock the water inlet cover to make the cover piece stable and prevent the water inlet cover cover piece from shaking under the action of water flow and affecting the driving stability of the unmanned aircraft. In the case of severe natural conditions, the double-sided water unmanned aircraft is overturned, and the water inlet cover fixing fork slides downward along the sliding assembly under the action of gravity. The originally stuck water inlet cover closes under the action of gravity, and the water inlet cover below opens and is stuck by the sliding water inlet cover fixing fork. The working principle is as follows: Figure 4 As shown. Therefore, the double-sided unmanned water vehicle can be driven on the front or back side, with the upper water inlet cover of the double water inlet spray pump closed and the lower water inlet cover opened.

[0040] In practical applications, a counterweight block 53 may be further provided on the fixed fork to increase the gravity of the fixed fork so that the fixed fork slides more smoothly.

[0041] In practical applications, the water inlet cover includes a cover plate mounting seat 32, which is arranged on the main body at the water inlet. The cover plate is arranged between two cover plate mounting seats and forms a water inlet cover structure in which the cover plate can rotate around the axis with the two cover plate mounting seats.

[0042] In practical applications, the cover plate mounting seat and the cover plate can be connected in the following manner: a convex shaft is provided at the portion where the cover plate mounting seat and the cover plate are connected, and an axial hole matching the convex shaft is provided on the cover plate, and the cover plate can rotate around the convex shaft.

[0043] In practical applications, the cover plate mounting seat and the cover plate can be connected in the following manner: an axial hole is provided at a portion of the cover plate mounting seat connected to the cover plate, and a convex shaft matching the axial hole is provided on the cover plate, and the cover plate can rotate around the convex shaft.

[0044] In practical applications, the cover plate mounting seat is provided with a cover plate anti-deflection structure 33, which can prevent the water inlet cover on one side on the water surface from opening too much and deflecting to the water inlet on the other side, causing one side of the water inlet to fail to close normally.

[0045] In practical applications, the main bodies of the edge of the cover sheet and the edge of the water inlet are respectively provided with devices that cooperate with each other and enable the edge of the cover sheet and the main body of the edge of the water inlet to attract or repel each other.

[0046] In practical applications, two covers are provided at each water inlet, and the two covers are rotated and closed by a fixed fork to open the water inlet. The two covers can be located in the middle of the water inlet when opened, and the closed covers can be used as tail wings when the aircraft is sailing. The function of the fixed fork and the fork groove is to lock the water inlet cover so that the two water inlet covers are tightly together to prevent the water inlet cover from shaking under the action of the water flow, which affects the driving stability of the unmanned aircraft.

[0047] In practical applications, the two cover sheets are respectively provided with structures that can make the two cover sheets absorb or repel each other, so as to facilitate the fixing fork to pick up the cover sheets and make it easier for the cover sheets to separate from each other.

[0048] In practical applications, a rubber pad 311 is provided on the contact surface between the edge of the cover and the edge of the water inlet of the main body. Its function is to increase the sealing performance when the water inlet cover is sucked into the main body, and prevent too much air from being sucked into the pump, resulting in a decrease in output power.

[0049] Embodiment 2

[0050] like Figure 1 , Figure 3 , Figure 5 and Figure 6As shown, a water jet propulsion device comprises a main body 1 and a water jet device 2 arranged in the main body, the water jet device comprises an engine 21, an impeller 22 and an engine mounting bracket 23, the engine is fixed inside the main body through the engine mounting bracket, the impeller is located at the water outlet and connected to the engine output shaft, the main body has a plurality of water inlets 11 and a water outlet 12, the plurality of water inlets are distributed on two water contact surfaces, a water inlet cover 3 is arranged at the water inlet, the water inlet cover comprises a cover sheet 31 that can rotate around an axis, a fixing fork 4 and a driving device 5 are arranged in the main body, the fixing fork is provided with a fork groove 41 that can fork the cover sheet, and the cover sheet can be forked and fixed by the fork groove when rotating around the axis to open the water inlet. Wherein, the driving device comprises a fixing fork mounting member 51 and a sliding assembly 52 arranged on the fixing fork mounting member, the fixing fork is movably connected to the fixing fork mounting member through the sliding assembly, and the fixing fork can slide on the fixing fork mounting member under the action of gravity. Generally, each water inlet is provided with a separate cover plate, a fixing fork and a driving device. In order to avoid duplication and reduce costs, the water inlet includes at least two oppositely arranged water inlets, and the two oppositely arranged water inlets share a fixing fork. Both ends of the common fixing fork are provided with fork grooves, which can be moved back and forth under the drive of the driving device to fork the covers of the two water inlets. In the event of adverse natural conditions, the double-sided water unmanned vehicle is overturned, and the fixing fork of the water inlet cover slides to the other end along the sliding assembly under the action of gravity. The originally stuck water inlet cover closes under the action of gravity, and the water inlet cover at the other end opens and is stuck by the sliding water inlet cover fixing fork. The working principle is as follows: Figure 6 As shown. Therefore, the double-sided unmanned water vehicle can be driven on the front or back side, with the upper water inlet cover of the double water inlet spray pump closed and the lower water inlet cover opened.

[0051] The forked cover piece can be used as the tail wing of the aircraft when the water jet propulsion device propels the aircraft to sail, which can increase the navigation stability of the aircraft. The function of the fixed fork and the fork groove is to lock the water inlet cover to make the cover piece stable and prevent the water inlet cover cover from shaking under the action of water flow, which will affect the driving stability of the unmanned aircraft.

[0052] In practical applications, a counterweight block 53 may be further provided on the fixed fork to increase the gravity of the fixed fork so that the fixed fork slides more smoothly.

[0053] In practical applications, the water inlet cover includes a cover plate mounting seat 32, which is arranged on the main body at the water inlet. The cover plate is arranged between two cover plate mounting seats and forms a water inlet cover structure in which the cover plate can rotate around the axis with the two cover plate mounting seats.

[0054] In practical applications, the cover plate mounting seat and the cover plate can be connected in the following manner: a convex shaft is provided at the portion where the cover plate mounting seat and the cover plate are connected, and an axial hole matching the convex shaft is provided on the cover plate, and the cover plate can rotate around the convex shaft.

[0055] In practical applications, the cover plate mounting seat and the cover plate can be connected in the following manner: an axial hole is provided at a portion of the cover plate mounting seat connected to the cover plate, and a convex shaft matching the axial hole is provided on the cover plate, and the cover plate can rotate around the convex shaft.

[0056] In practical applications, the cover plate mounting seat is provided with a cover plate anti-deflection structure 33, which can prevent the water inlet cover on one side on the water surface from opening too much and deflecting to the water inlet on the other side, causing one side of the water inlet to fail to close normally.

[0057] In practical applications, the main bodies of the edge of the cover sheet and the edge of the water inlet are respectively provided with devices that cooperate with each other and enable the edge of the cover sheet and the main body of the edge of the water inlet to attract or repel each other.

[0058] In practical applications, two covers are provided at each water inlet, and the two covers are rotated and closed by a fixed fork to open the water inlet. The two covers can be located in the middle of the water inlet when opened, and the closed covers can be used as tail wings when the aircraft is sailing. The function of the fixed fork and the fork groove is to lock the water inlet cover so that the two water inlet covers are tightly together to prevent the water inlet cover from shaking under the action of the water flow, which affects the driving stability of the unmanned aircraft.

[0059] In practical applications, the two cover sheets are respectively provided with structures that can make the two cover sheets absorb or repel each other, so as to facilitate the fixing fork to pick up the cover sheets and make it easier for the cover sheets to separate from each other.

[0060] In practical applications, a rubber pad 311 is provided on the contact surface between the edge of the cover and the edge of the water inlet of the main body. Its function is to increase the sealing performance when the water inlet cover is sucked into the main body, and prevent too much air from being sucked into the pump, resulting in a decrease in output power.

[0061] Embodiment 3

[0062] like Figure 1 , Figure 3 , Figure 7 , Figure 8 and Fig. 9As shown, a water jet propulsion device comprises a main body 1 and a water jet device 2 arranged in the main body, the water jet device comprises an engine 21, an impeller 22 and an engine mounting bracket 23, the engine is fixed inside the main body through the engine mounting bracket, the impeller is located at the water outlet and connected to the engine output shaft, the main body has a plurality of water inlets 11 and a water outlet 12, the plurality of water inlets are distributed on two water contacting surfaces, a water inlet cover 3 is provided at the water inlet, the water inlet cover comprises a cover piece 31 rotatable around an axis, a fixing fork 4 and a driving device 5 are provided in the main body, the fixing fork is provided with a fork groove 41 which can fork the cover piece, and the cover piece can be forked and fixed by the fork groove when rotating around the axis to open the water inlet.

[0063] The driving device 5 includes a fixed fork mounting part 51, a fixed fork anti-slipping part 52, at least one electromagnet 53 with changeable polarity and a magnet 54 cooperating with the electromagnet, the fixed fork anti-slipping part can be slidably connected to the fixed fork mounting part, the fixed fork is fixed to the fixed fork anti-slipping part, the fixed fork anti-slipping part is fixedly provided with an electromagnet with changeable polarity, and the fixed fork mounting part is fixedly provided with a magnet cooperating with the electromagnet. In practical applications, it can also be: the fixed fork mounting part is fixedly provided with an electromagnet with changeable polarity, and the fixed fork anti-slipping part is fixedly provided with a magnet cooperating with the electromagnet.

[0064] The water jet propulsion device includes a sensor and a control system, and the control system is connected to and controls the sensor and the driving device respectively. The posture of the double-sided water unmanned vehicle can be sensed, so as to judge whether the double-sided water unmanned vehicle is currently on the front side or the back side. Then, the control system controls the polarity change of the electromagnet in the driving device, so that the fixed fork can move to fork up the cover sheet or leave the cover sheet so that the cover sheet covers the water inlet, so that the water inlet on the water surface is in a closed state.

[0065] The forked cover piece can be used as the tail wing of the aircraft when the water jet propulsion device propels the aircraft to sail, which can increase the navigation stability of the aircraft. The function of the fixed fork and the fork groove is to lock the water inlet cover to make the cover piece stable and prevent the water inlet cover cover from shaking under the action of water flow, which will affect the driving stability of the unmanned aircraft.

[0066] In case of adverse natural conditions, the double-sided water unmanned vehicle is overturned. At this time, the control system changes the polarity of the electromagnet, so that the permanent magnet above the fixed fork has the same polarity as the electromagnet fixed on the anti-detachment part of the fixed fork, and the permanent magnet below the fixed fork has the opposite polarity as the electromagnet fixed on the anti-detachment part of the fixed fork. Under the combined action of magnetic force and gravity, the lower water inlet cover opens, the upper water inlet cover closes, and the water inlet cover fixing fork slides down the slide slot and then clamps the lower water inlet cover, and then clamps the lower water inlet cover and locks the water inlet cover so that the two water inlet covers are tightly together to prevent the water inlet cover from shaking under the action of the water flow and affecting the driving stability of the unmanned vehicle. The working principle is as follows: Fig. 9 shown.

[0067] In practical applications, the water inlet cover includes a cover plate mounting seat 32, which is arranged on the main body at the water inlet. The cover plate is arranged between two cover plate mounting seats and forms a water inlet cover structure in which the cover plate can rotate around the axis with the two cover plate mounting seats.

[0068] In practical applications, the cover plate mounting seat and the cover plate can be connected in the following manner: a convex shaft is provided at the portion where the cover plate mounting seat and the cover plate are connected, and an axial hole matching the convex shaft is provided on the cover plate, and the cover plate can rotate around the convex shaft.

[0069] In practical applications, the cover plate mounting seat and the cover plate can be connected in the following manner: an axial hole is provided at a portion of the cover plate mounting seat connected to the cover plate, and a convex shaft matching the axial hole is provided on the cover plate, and the cover plate can rotate around the convex shaft.

[0070] In practical applications, the cover plate mounting seat is provided with a cover plate anti-deflection structure 33, which can prevent the water inlet cover on one side on the water surface from opening too much and deflecting to the water inlet on the other side, causing one side of the water inlet to fail to close normally.

[0071] In practical applications, the main bodies of the edge of the cover sheet and the edge of the water inlet are respectively provided with devices that cooperate with each other and enable the edge of the cover sheet and the main body of the edge of the water inlet to attract or repel each other.

[0072] In practical applications, two covers are provided at each water inlet, and the two covers are rotated and closed by a fixed fork to open the water inlet. The two covers can be located in the middle of the water inlet when opened, and the closed covers can be used as tail wings when the aircraft is sailing. The function of the fixed fork and the fork groove is to lock the water inlet cover so that the two water inlet covers are tightly together to prevent the water inlet cover from shaking under the action of the water flow, which affects the driving stability of the unmanned aircraft.

[0073] In practical applications, the two cover sheets are respectively provided with structures that can make the two cover sheets absorb or repel each other, so as to facilitate the fixing fork to pick up the cover sheets and make it easier for the cover sheets to separate from each other.

[0074] In practical applications, a rubber pad 311 is provided on the contact surface between the edge of the cover and the edge of the water inlet of the main body. Its function is to increase the sealing performance when the water inlet cover is sucked into the main body, and prevent too much air from being sucked into the pump, resulting in a decrease in output power.

[0075] Embodiment 4

[0076] like Figure 1 , Figure 3 , Fig. 9 , Fig.10 and Fig.11 As shown, a water jet propulsion device comprises a main body 1 and a water jet device 2 arranged in the main body, the water jet device comprises an engine 21, an impeller 22 and an engine mounting bracket 23, the engine is fixed inside the main body through the engine mounting bracket, the impeller is located at the water outlet and connected to the engine output shaft, the main body has a plurality of water inlets 11 and a water outlet 12, the plurality of water inlets are distributed on two water contacting surfaces, a water inlet cover 3 is provided at the water inlet, the water inlet cover comprises a cover piece 31 rotatable around an axis, a fixing fork 4 and a driving device 5 are provided in the main body, the fixing fork is provided with a fork groove 41 which can fork the cover piece, and the cover piece can be forked and fixed by the fork groove when rotating around the axis to open the water inlet.

[0077] The driving device 5 includes a fixed fork mounting part 51, a fixed fork anti-slipping part 52, at least one electromagnet 53 with changeable polarity and a magnet 54 cooperating with the electromagnet, the fixed fork anti-slipping part can be slidably connected to the fixed fork mounting part, the fixed fork is fixed to the fixed fork anti-slipping part, the fixed fork anti-slipping part is fixedly provided with an electromagnet with changeable polarity, and the fixed fork mounting part is fixedly provided with a magnet cooperating with the electromagnet. In practical applications, it can also be: the fixed fork mounting part is fixedly provided with an electromagnet with changeable polarity, and the fixed fork anti-slipping part is fixedly provided with a magnet cooperating with the electromagnet.

[0078] The water jet propulsion device includes a sensor and a control system, and the control system is connected to and controls the sensor and the driving device respectively. The posture of the double-sided water unmanned vehicle can be sensed, so as to judge whether the double-sided water unmanned vehicle is currently on the front side or the back side. Then, the control system controls the polarity change of the electromagnet in the driving device, so that the fixed fork can move to fork up the cover sheet or leave the cover sheet so that the cover sheet covers the water inlet, so that the water inlet on the water surface is in a closed state.

[0079] Generally, each water inlet is provided with a separate cover plate, a fixed fork and a driving device. In order to avoid duplication and reduce costs, the water inlet includes at least two oppositely arranged water inlets, and the two oppositely arranged water inlets share a fixed fork. Both ends of the shared fixed fork are provided with fork grooves, which can be moved back and forth under the drive of the driving device to fork the cover plates of the two water inlets respectively.

[0080] The forked cover piece can be used as the tail wing of the aircraft when the water jet propulsion device propels the aircraft to sail, which can increase the navigation stability of the aircraft. The function of the fixed fork and the fork groove is to lock the water inlet cover to make the cover piece stable and prevent the water inlet cover cover from shaking under the action of water flow, which will affect the driving stability of the unmanned aircraft.

[0081] In case of adverse natural conditions, the double-sided water unmanned vehicle is overturned. At this time, the control system changes the polarity of the electromagnet, so that the upper permanent magnet has the same polarity as the electromagnet fixed on the fixed fork anti-detachment part, and the lower permanent magnet has the opposite polarity as the electromagnet fixed on the fixed fork anti-detachment part. Under the combined action of magnetic force and gravity, the lower water inlet cover opens, the upper water inlet cover closes, the water inlet cover fixing fork slides down the slide slot and then clamps the lower water inlet cover, and then clamps the lower water inlet cover and locks the water inlet cover so that the two water inlet covers are tightly together, preventing the water inlet cover from shaking under the action of the water flow and affecting the driving stability of the unmanned vehicle. The working principle is as follows: Fig. 9 shown.

[0082] In practical applications, the water inlet cover includes a cover plate mounting seat 32, which is arranged on the main body at the water inlet. The cover plate is arranged between two cover plate mounting seats and forms a water inlet cover structure in which the cover plate can rotate around the axis with the two cover plate mounting seats.

[0083] In practical applications, the cover plate mounting seat and the cover plate can be connected in the following manner: a convex shaft is provided at the portion where the cover plate mounting seat and the cover plate are connected, and an axial hole matching the convex shaft is provided on the cover plate, and the cover plate can rotate around the convex shaft.

[0084] In practical applications, the cover plate mounting seat and the cover plate can be connected in the following manner: an axial hole is provided at a portion of the cover plate mounting seat connected to the cover plate, and a convex shaft matching the axial hole is provided on the cover plate, and the cover plate can rotate around the convex shaft.

[0085] In practical applications, the cover plate mounting seat is provided with a cover plate anti-deflection structure 33, which can prevent the water inlet cover on one side on the water surface from opening too much and deflecting to the water inlet on the other side, causing one side of the water inlet to fail to close normally.

[0086] In practical applications, the main bodies of the edge of the cover sheet and the edge of the water inlet are respectively provided with devices that cooperate with each other and enable the edge of the cover sheet and the main body of the edge of the water inlet to attract or repel each other.

[0087] In practical applications, two covers are provided at each water inlet, and the two covers are rotated and closed by a fixed fork to open the water inlet. The two covers can be located in the middle of the water inlet when opened, and the closed covers can be used as tail wings when the aircraft is sailing. The function of the fixed fork and the fork groove is to lock the water inlet cover so that the two water inlet covers are tightly together to prevent the water inlet cover from shaking under the action of the water flow, which affects the driving stability of the unmanned aircraft.

[0088] In practical applications, the two cover sheets are respectively provided with structures that can make the two cover sheets absorb or repel each other, so as to facilitate the fixing fork to pick up the cover sheets and make it easier for the cover sheets to separate from each other.

[0089] In practical applications, a rubber pad 311 is provided on the contact surface between the edge of the cover and the edge of the water inlet of the main body. Its function is to increase the sealing performance when the water inlet cover is sucked into the main body, and prevent too much air from being sucked into the pump, resulting in a decrease in output power.

[0090] Embodiment 5

[0091] like Figure 1 , Figure 3 , Fig.12 , Fig.13 and Fig.14 As shown, a water jet propulsion device comprises a main body 1 and a water jet device 2 arranged in the main body, the water jet device comprises an engine 21, an impeller 22 and an engine mounting bracket 23, the engine is fixed inside the main body through the engine mounting bracket, the impeller is located at the water outlet and connected to the engine output shaft, the main body has a plurality of water inlets 11 and a water outlet 12, the plurality of water inlets are distributed on two water contacting surfaces, a water inlet cover 3 is provided at the water inlet, the water inlet cover comprises a cover piece 31 rotatable around an axis, a fixing fork 4 and a driving device 5 are provided in the main body, the fixing fork is provided with a fork groove 41 which can fork the cover piece, and the cover piece can be forked and fixed by the fork groove when rotating around the axis to open the water inlet.

[0092] The driving device 5 includes a fixed fork mounting member 51 and a movable pair 52 arranged on the fixed fork mounting member, the fixed fork is movably connected to the fixed fork mounting member through the movable pair, and the fixed fork is connected to a steering gear 54 through a transmission structure 53 and moves on the fixed fork mounting member under the drive of the steering gear.

[0093] The water jet propulsion device includes a sensor and a control system, and the control system is connected to and controls the sensor and the driving device respectively. The posture of the double-sided water unmanned vehicle can be sensed, so as to judge whether the double-sided water unmanned vehicle is currently on the front or back side, and then the steering gear in the driving device is controlled to rotate by the control system, and the fixed fork is moved by the transmission structure to fork up the cover sheet or leave the cover sheet so that the cover sheet covers the water inlet, so that the water inlet on the water surface is in a closed state.

[0094] Generally, each water inlet is provided with a separate cover plate, a fixed fork and a driving device. In order to avoid duplication and reduce costs, the water inlet includes at least two oppositely arranged water inlets, and the two oppositely arranged water inlets share a fixed fork. Both ends of the shared fixed fork are provided with fork grooves, which can be moved back and forth under the drive of the driving device to fork the cover plates of the two water inlets respectively.

[0095] The forked cover piece can be used as the tail wing of the aircraft when the water jet propulsion device propels the aircraft to sail, which can increase the navigation stability of the aircraft. The function of the fixed fork and the fork groove is to lock the water inlet cover to make the cover piece stable and prevent the water inlet cover cover from shaking under the action of water flow, which will affect the driving stability of the unmanned aircraft.

[0096] In the case of adverse natural conditions, the double-sided water unmanned aerial vehicle is overturned. At this time, the control system drives the steering gear to rotate, and the fixed fork can move up and down through the transmission structure to fork the cover or leave the cover. Under the action of the fixed fork, the lower water inlet cover is opened, and the upper water inlet cover is closed. The water inlet cover fixing fork slides down the slide slot and then clamps the lower water inlet cover, and then clamps the lower water inlet cover and locks the water inlet cover so that the two water inlet covers are tightly together to prevent the water inlet cover from shaking under the action of the water flow and affecting the driving stability of the unmanned aerial vehicle. The working principle is as follows Fig.14 shown.

[0097] In practical applications, the water inlet cover includes a cover plate mounting seat 32, which is arranged on the main body at the water inlet. The cover plate is arranged between two cover plate mounting seats and forms a water inlet cover structure in which the cover plate can rotate around the axis with the two cover plate mounting seats.

[0098] In practical applications, the cover plate mounting seat and the cover plate can be connected in the following manner: a convex shaft is provided at the portion where the cover plate mounting seat and the cover plate are connected, and an axial hole matching the convex shaft is provided on the cover plate, and the cover plate can rotate around the convex shaft.

[0099] In practical applications, the cover plate mounting seat and the cover plate can be connected in the following manner: an axial hole is provided at a portion of the cover plate mounting seat connected to the cover plate, and a convex shaft matching the axial hole is provided on the cover plate, and the cover plate can rotate around the convex shaft.

[0100] In practical applications, the cover plate mounting seat is provided with a cover plate anti-deflection structure 33, which can prevent the water inlet cover on one side on the water surface from opening too much and deflecting to the water inlet on the other side, causing one side of the water inlet to fail to close normally.

[0101] In practical applications, the main bodies of the edge of the cover sheet and the edge of the water inlet are respectively provided with devices that cooperate with each other and enable the edge of the cover sheet and the main body of the edge of the water inlet to attract or repel each other.

[0102] In practical applications, two covers are provided at each water inlet, and the two covers are rotated and closed by a fixed fork to open the water inlet. The two covers can be located in the middle of the water inlet when opened, and the closed covers can be used as tail wings when the aircraft is sailing. The function of the fixed fork and the fork groove is to lock the water inlet cover so that the two water inlet covers are tightly together to prevent the water inlet cover from shaking under the action of the water flow, which affects the driving stability of the unmanned aircraft.

[0103] In practical applications, the two cover sheets are respectively provided with structures that can make the two cover sheets absorb or repel each other, so as to facilitate the fixing fork to pick up the cover sheets and make it easier for the cover sheets to separate from each other.

[0104] In practical applications, a rubber pad 311 is provided on the contact surface between the edge of the cover and the edge of the water inlet of the main body. Its function is to increase the sealing performance when the water inlet cover is sucked into the main body, and prevent too much air from being sucked into the pump, resulting in a decrease in output power.

[0105] Embodiment 6

[0106] like Fig.15 As shown, a double-surface watercraft comprises a vehicle body 1 having two water-contacting surfaces and at least one propulsion unit 2 connected to the vehicle body, wherein the propulsion unit is provided with a water jet propulsion device as described in any of the above embodiments.

[0107] Advantages of the implementation of the present invention: a water jet propulsion device comprises a main body and a water jet device arranged in the main body, the water jet device comprises an engine, an impeller and an engine fixing frame, the engine is fixed inside the main body through the engine fixing frame, the impeller is located at the water outlet and connected to the engine output shaft, the main body has a plurality of water inlets and a water outlet, the plurality of water inlets are distributed on two water contacting surfaces, a water inlet cover is arranged at the water inlet, the water inlet cover comprises a cover sheet rotatable around an axis, a fixing fork and a driving device are arranged in the main body, the fixing fork is provided with a fork groove which can fork the cover sheet, and the cover sheet can be forked and fixed by the fork groove when rotating around the axis to open the water inlet. ; The opening and closing states of the water inlets on the front and back sides of the lifeboat can be automatically switched, thereby reducing the power loss of the unmanned vehicle and improving the operating efficiency of the water unmanned vehicle under harsh conditions; compared with the traditional remote-controlled double-sided water unmanned vehicle, both water inlets are in an open state, a large amount of air will enter from the water inlet above the water surface, resulting in low efficiency of the water jet propulsion. Under normal working conditions, the improved remote-controlled double-sided water unmanned vehicle only opens the water inlet below the water surface, avoiding the entry of air from the water inlet on the water surface, thereby improving the pump spray efficiency, increasing the speed and stability of the double-sided water unmanned vehicle, and improving the rescue capability of the remote-controlled double-sided water unmanned vehicle under harsh rescue conditions.

[0108] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A water jet propulsion device, comprising a main body and a water jet device arranged in the main body, the water jet device comprising an engine, an impeller and an engine mounting bracket, the engine being fixed inside the main body through the engine mounting bracket, the main body having a plurality of water inlets and a water outlet, the plurality of water inlets being distributed on two water contact surfaces, the impeller being located at the water outlet and connected to the engine output shaft, characterized in that: The water inlet is provided with a water inlet cover, the water inlet cover includes a cover sheet that can rotate around an axis, a fixing fork and a driving device are provided in the main body, the fixing fork is provided with a fork groove that can fork the cover sheet, and the cover sheet can be forked and fixed by the fork groove when rotating around the axis to open the water inlet; The water inlet comprises at least two oppositely arranged water inlets, the two oppositely arranged water inlets share a fixed fork, both ends of the common fixed fork are respectively provided with fork grooves, and can move back and forth under the drive of the driving device so as to fork the cover sheets of the two water inlets respectively; The driving device comprises a fixed fork mounting member and a sliding assembly arranged on the fixed fork mounting member, the fixed fork is movably connected to the fixed fork mounting member through the sliding assembly, and the fixed fork can slide on the fixed fork mounting member under the action of gravity.

2. The water jet propulsion device according to claim 1, characterized in that: The driving device includes a fixed fork mounting part, a fixed fork anti-slipping part, at least one electromagnet with changeable polarity and a magnet cooperating with the electromagnet; the fixed fork anti-slipping part can be slidably connected to the fixed fork mounting part; the fixed fork is fixed to the fixed fork anti-slipping part; the fixed fork anti-slipping part is fixedly provided with an electromagnet with changeable polarity or a magnet cooperating with the electromagnet; the fixed fork mounting part is fixedly provided with a magnet cooperating with the electromagnet or an electromagnet with changeable polarity.

3. The water jet propulsion device according to claim 1, characterized in that: The driving device includes a fixed fork mounting member and a moving pair arranged on the fixed fork mounting member, the fixed fork is movably connected to the fixed fork mounting member through the moving pair, the fixed fork is connected to a steering gear through a transmission structure and moves on the fixed fork mounting member under the drive of the steering gear.

4. The water jet propulsion device according to claim 1, characterized in that: The water jet propulsion device comprises a sensor and a control system, and the control system is respectively connected to and controls the sensor and the driving device.

5. The water jet propulsion device according to claim 1, characterized in that: The water inlet cover comprises a cover plate mounting seat, which is arranged on the main body at the water inlet. The cover plate is arranged between two cover plate mounting seats and forms a water inlet cover structure with the two cover plate mounting seats in which the cover plate can rotate around an axis.

6. The water jet propulsion device according to claim 5, characterized in that: The portion where the cover plate mounting seat is connected to the cover plate is provided with a convex shaft and the cover plate is provided with an axial hole that matches the convex shaft, or the portion where the cover plate mounting seat is connected to the cover plate is provided with an axial hole and the cover plate is provided with a convex shaft that matches the axial hole.

7. The water jet propulsion device according to claim 6, characterized in that: The cover sheet mounting seat is provided with a cover sheet anti-deflection structure.

8. The water jet propulsion device according to any one of claims 1 to 7, characterized in that: The main bodies of the edge of the cover sheet and the edge of the water inlet are respectively provided with devices that cooperate with each other and can make the edge of the cover sheet and the main body of the edge of the water inlet absorb or repel each other.

9. The water jet propulsion device according to claim 8, characterized in that: Two cover sheets are respectively provided at each water inlet, and the two cover sheets are rotated and closed by a fixed fork to open the water inlet.

10. The water jet propulsion device according to claim 9, characterized in that: The two cover sheets are respectively provided with structures that can make the two cover sheets absorb or repel each other.

11. A double-surface watercraft, characterized in that: The double-surface watercraft comprises a vehicle body having two water-contacting surfaces and at least one propulsion unit connected to the vehicle body, wherein the propulsion unit is provided with a water jet propulsion device as described in any one of claims 1 to 10.

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