Water-jet propeller with integrated structure

Abstract

The utility model relates to the field of water jet propulsion pumps for electric surfboards, in particular to a water jet propeller of an integrated structure. The problems that a motor, a main shell and a controller of an existing propeller are separated, so that connection and waterproof structures are complex and the like are solved. The water-jet propeller of the integrated structure comprises a main shell, a controller, a motor and a flow guide shell, a propeller shaft penetrates through a flow channel and is in transmission connection with a main shaft of the motor, the rear end of the propeller shaft extends into a barrel cavity and is fixedly connected with an impeller, and a motor shell is composed of an end cover and an installation barrel cavity integrally extending from the front end of the main shell. The main shaft hermetically extends out of one end, corresponding to the bottom wall, of the mounting cylinder cavity and is in transmission connection with the paddle shaft; the main shell is provided with a waterproof upper cavity for placing the controller, the wall of one side, facing the mounting cylinder cavity, of the upper cavity partially coincides with the bottom wall of the mounting cylinder cavity, and the side wall is provided with a waterproof power supply connector and a waterproof control connector. The motor, the controller and the main shell are integrated, the structure is compact and waterproof, the coaxiality of the motor and the main shell is good, and the transmission efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of a water jet propulsion pump for an electric surfboard, in particular to a water jet propulsion device with an integrated structure. Background Art

[0002] The working principle of the water jet propulsion is to use a motor to drive the impeller with blades to rotate, converting water into a high-speed jet of water and shooting it backward to generate a reaction thrust. It is installed at the tail of an electric surfboard for use. The propeller body includes a main housing and a motor and a guide shell connected at both ends. The motor and the main housing are split structures. The motor is fixed to the main housing through its outer shell and bolts. Both the main housing and the guide shell are provided with cavities and connected to form a flow channel. The main housing corresponds to the water inlet side of the flow channel and has an opening at the bottom as a water inlet. The guide shell corresponds to the water outlet side of the flow channel and has an impeller with a propeller shaft inside. One end of the propeller shaft passes through the flow channel forward and extends into a coupling accommodating chamber set in the main housing, and is connected to the main shaft transmission of the motor output power through the coupling in the accommodating chamber. The coupling accommodating chamber needs to be provided with a sealing structure at one end of the propeller shaft to prevent water from flowing into the accommodating chamber. In addition, the on / off and speed adjustment of the motor requires wiring to connect the controller external to the propeller body.

[0003] Due to the separate structure of the motor, main housing and controller, there are problems such as assembly difficulties, high requirements for waterproof connection and high processing requirements. For example, the waterproofness of the motor housing and the main housing depends on rubber ring sealing, and the controller needs a special waterproof joint to connect with the motor. The poor coaxiality of the motor housing and the main housing will affect the subsequent transmission connection of the main shaft and the propeller shaft, thereby affecting the transmission efficiency and accelerating power consumption. Furthermore, the heat generated by the motor and controller requires a special heat dissipation design. Utility Model Content

[0004] The technical problems to be solved and the technical tasks proposed by the utility model are aimed at the technical problems of the assembly trouble caused by the separate connection of the motor, main housing and controller of the existing water jet propulsion device, the complex waterproof structure and the high processing coaxiality requirements. The utility model provides a water jet propulsion device with an integrated structure. The propeller expands the main housing and changes the internal structure to achieve an integrated structure of the motor, controller and main housing. The motor and controller are both arranged inside the main housing, eliminating the complex waterproof structure required for the original separate connection. At the same time, the motor and the main housing have good coaxiality, which can ensure the transmission efficiency of the connection between the main shaft and the propeller shaft, and avoid the increase in power consumption due to the reduction in transmission efficiency. Furthermore, there is a special water cooling structure in the main housing to help the motor and controller dissipate heat.

[0005] The utility model adopts a technical solution to solve the technical problem: a water jet propulsion device with an integrated structure, including a main shell, a controller, a motor and a cylindrical guide shell, a flow channel with a water inlet is provided at the lower part of the main shell, the flow channel is connected with one end of the cylindrical cavity of the guide shell, a water spray port is formed at the other end of the cylindrical cavity, a propeller shaft is passed through the flow channel, the front end of the propeller shaft is connected with the main shaft of the motor by transmission, and the rear end of the propeller shaft extends into the cylindrical cavity and fixedly connects with the impeller, and is characterized in that the outer shell of the motor is composed of an installation cylindrical cavity integrally extended from the end cover and the front end of the main shell, one end of the installation cylindrical cavity is open and matched with the end cover seal, the main shaft extends out from one end of the installation cylindrical cavity corresponding to the bottom wall and is connected with the propeller shaft by transmission, and the bottom wall of the installation cylindrical cavity where the main shaft passes and the end cover are provided with bearings matching the main shaft; the main shell is provided with a waterproof upper cavity for accommodating the controller, the wall of the upper cavity facing the installation cylindrical cavity and the bottom wall of the open cylindrical cavity partially overlap, and the side wall of the upper cavity is provided with a waterproof power supply connector and a control connector. The utility model sets the motor and the controller in the main shell, so that the three become an integrated structure, the propeller structure is more simplified, the built-in structure of the motor and the controller eliminates the waterproof connection required by the original split structure, and makes the coaxiality of the motor and the main shell more guaranteed. The main shaft of the motor and the propeller shaft have higher transmission efficiency and higher propulsion efficiency under the coaxial condition. The installation cylinder cavity is extended from the main shell to serve as the outer shell cylinder cavity of the motor, and the motor is assembled with the end cover to form the outer shell of the motor. After the motor is assembled, it becomes an integrated structure with the main shell, so that the transmission connection between the main shaft and the propeller shaft can be more efficient. The main shaft is installed and positioned by bearings at two places, the end cover and the bottom wall of the installation cylinder cavity; at the same time, the main shell is installed with the controller through the upper cavity set thereon, and the controller is also built into the main shell and its integrated structure. Since the upper cavity is waterproof, the controller and the motor can use the wall opening that overlaps the upper cavity and the installation cylinder cavity for wiring, which is not only short, but also does not require additional waterproof sealing; the power supply connector and the control connector set on the side wall of the upper cavity are both waterproof connectors, wherein the power supply connector is used for external power supply to power the controller and the motor, and the control connector is used for inputting signals to operate the controller, and the waterproof connector is a prior art.

[0006] As a further improvement and supplement to the above technical solution, the utility model adopts the following technical measures: a tube seat protruding from the bottom wall is arranged at the center of the bottom wall of the installation cylinder cavity, the spindle passes through the tube seat and extends out of the installation cylinder cavity, a first bearing and a waterproof seal are arranged between the tube seat and the spindle, and the waterproof seal is located outside the first bearing to prevent water from flowing into the first bearing along the spindle; a raised annular cone is arranged at the center of the inner wall of the end cover, and the annular cone forms a concave hole on the inner wall of the end cover to install a second bearing matching the spindle. The bearings are installed on the bottom wall of the installation cylinder cavity and the inner wall of the end cover by arranging the tube seat and the annular cone respectively, so as to realize the positioning and installation of the spindle; at the same time, the tube seat is also provided with a waterproof seal on the outside of the first bearing to prevent water from flowing into the first bearing along the surface of the spindle and entering the inside of the motor.

[0007] A cooling chamber is provided inside the main shell above the flow channel, the top wall of the cooling chamber overlaps with the bottom wall of the upper chamber, the side wall of the cooling chamber overlaps with the wall corresponding to the mounting tube chamber, a cooling water inlet is provided at the bottom of the main shell to connect with the cooling chamber, a mounting hole is provided on the inner wall of the cooling chamber to connect with the flow channel, the front end of the propeller shaft extends into the cooling chamber through the mounting hole, the main shaft extends into the cooling chamber through the pipe seat and is connected to the front end of the propeller shaft through a coupling. When the propeller is working, water can flow into the cooling chamber from the cooling water inlet, and the upper chamber is cooled by water through the overlapping wall shared by the cooling chamber and the bottom wall of the upper chamber, so as to solve the internal heat accumulation in the upper chamber caused by the heating of the controller, and then dissipate the heat of the controller. At the same time, the cooling chamber and the mounting tube chamber share the overlapping wall, which also has an obvious water cooling effect on the mounting tube chamber, and the water in the cooling chamber is discharged into the flow channel through the mounting hole; the main shaft and the propeller shaft are connected by a coupling in the cooling chamber.

[0008] The propeller shaft is provided with a drain wheel on the shaft section adjacent to the mounting hole in the cooling cavity. The drain wheel rotates at high speed driven by the propeller shaft to pump out water in the cooling cavity, accelerate the cooling water to be discharged from the mounting hole into the flow channel, increase the water circulation flow rate in the cooling cavity, and improve the water cooling effect of the cooling cavity on the upper cavity and the mounting cylinder cavity.

[0009] The main shell comprises a main body and a first flow channel plate and a second flow channel plate fixed to the bottom thereof, the mounting cylinder cavity and the upper cavity are both arranged on the main body, a concave cavity opening downward is arranged at the bottom of the main body, the first flow channel plate and the second flow channel plate are distributed along the length direction of the main body and cover the opening; the flow channel on the main shell is divided into a first flow channel and a second flow channel which are connected in sequence along the water flow direction, a concave portion is arranged on the first flow channel plate and a first flow channel is formed on its inner wall surface, the concave portion is provided with a communicating lower opening and a side opening which serve as a water inlet and a water outlet of the first flow channel respectively, the second flow channel plate and the inner wall of the main body concave cavity above it form a second flow channel, the first flow channel plate is pressed against the inner wall of the main body concave cavity corresponding to the second flow channel through the concave portion so that the first flow channel and the second flow channel are connected, and notches are respectively arranged at the connecting part between the first flow channel plate and the inner wall of the main body concave cavity to form the mounting hole; the cooling cavity is surrounded by the first flow channel plate and the inner wall of the main body concave cavity above it, and the cooling water inlet is a through hole opened at one end of the first flow channel plate away from the concave portion. The main shell is connected by a main body and two flow channel plates, and the two flow channel plates are fixedly connected to the bottom of the main body. The flow channel of the main shell is divided into a first and a second flow channel that are connected front and rear. The first flow channel is formed on the inner wall surface of the recess of the first flow channel plate, and the cooling chamber is surrounded by the first flow channel plate and the upper main body recess. A through hole is opened on the first flow channel plate as a cooling water inlet; the second flow channel is surrounded by the second flow channel plate and part of the inner wall of the main body recess; the first flow channel plate is against the inner wall of the main body recess through the recess to achieve the connection between the first flow channel and the second flow channel, and a notch is respectively provided on the first flow channel plate and the inner wall of the main body recess at the connection point, and the two notches are spliced ​​to form a mounting hole for passing the propeller shaft and draining water.

[0010] The inner wall of the body cavity is provided with an arc-shaped inner concave step at the position against the first flow channel plate, the concave portion of the first flow channel plate extends toward one side of the second flow channel plate and forms an arc-shaped narrow edge at the extension end that matches the step, the narrow edge can be in close contact with the step, so that the inner wall of the concave portion of the first flow channel plate and the inner wall of the body cavity are flush at the joint. The smooth transition between the two flow channel inner wall surfaces is achieved by the close contact between the concave step and the narrow edge, wherein the step is located on the inner wall of the body cavity and extends in an arc shape, and the narrow edge is formed by the concave portion on the first flow channel plate extending toward one side of the second flow channel plate.

[0011] The first flow channel plate is formed by integrally connecting a U-shaped first bottom plate and a first inner plate that is arched in the U-shaped gap. The first bottom plate is fixedly connected to the bottom of the body by bolts on both sides. The first inner plate surrounds a recess on the first flow channel plate. The through hole is arranged at the end of the first bottom plate. The first flow channel plate is formed by integrally connecting a first bottom plate and a first inner plate. The first bottom plate is fixedly connected to the bottom of the body by bolts installed on both sides of the U-shape. The arched first inner plate serves as a recess on the first flow channel plate.

[0012] The second flow channel plate is formed by integrally connecting a V-shaped second bottom plate and a second inner plate extending upward from the inner side of the V-shaped gap. The second bottom plate is fixed to the bottom of the body by bolts on both sides. The second inner plate is bent and extended upward along the edge of the V-shaped gap of the second bottom plate to form a left-right symmetrical curved plate. The top edges of the left and right sides of the curved plate are in close contact with the inner wall of the body cavity and enclose the inner wall of the cavity to form a second flow channel. The second flow channel plate is fixed to the bottom of the body by bolts on both sides of the second bottom plate. The curved and extended curved second inner plate and the inner wall of the body cavity enclose the second flow channel.

[0013] The upper cavity is open at the top, and the upper cavity is waterproofed by filling with glue or installing a top cover to seal the top opening. The upper cavity can be waterproofed by filling with glue from the open end after the controller is installed, or a top cover is added to the top open end for sealing and waterproofing, or a combination of filling with glue and a top cover is used for waterproofing.

[0014] The main housing is provided with a side plate integrated with the installation cylinder cavity on both sides of the left and right sides of the installation cylinder cavity, and the two side plates and the side wall of the installation cylinder cavity on the same side are combined to form two open water storage cavities. The open water storage cavity formed by the side plate and the side wall of the installation cylinder cavity can store water and use the high specific heat capacity of water to dissipate the heat from the side wall of the installation cylinder cavity, thereby helping to cool the motor.

[0015] The utility model arranges the motor and the controller in the main shell so that the three become an integrated structure, avoiding the complicated waterproof connection required for the original three-part design during assembly, and the coaxiality of the motor and the main shell is guaranteed. The main shaft of the motor and the propeller shaft of the propeller can be transmitted more efficiently when the coaxiality is guaranteed, thereby improving the working efficiency of the propeller; further, the main shell is also equipped with a special cooling chamber and is equipped with circulating water to dissipate heat and cool the motor casing and the controller. The motor also has two open cavities on the main shell for storing water and can dissipate heat from the motor casing through the stored water. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 : Schematic diagram of the overall structure of the utility model.

[0017] Figure 2 : Figure 1 AA section view.

[0018] Figure 3 : Schematic diagram of the main shell decomposition of the utility model.

[0019] Figure 4 : Enlarged view of part B of Figure 3.

[0020] Figure 5 : Schematic diagram of the main body structure of the utility model.

[0021] Figure 6 : Figure 5 sectional view of .

[0022] Figure 7 : Schematic diagram of the first flow channel plate of the present invention.

[0023] Figure 8 : Schematic diagram of the second flow channel plate of the present invention.

[0024] In the figure: 1. Top cover, 2. Controller, 3. First flow channel plate (also forms the bottom wall of the motor housing cooling chamber), 3-1. Narrow edge, 3-2. Concave portion, 3-3. First bottom plate, 3-4. First inner plate, 3-5. First mounting hole, 4. Second flow channel plate, 4-1. Second bottom plate, 4-2. Second inner plate, 4-3. Second mounting hole, 5. End cover, 6. Paddle shaft, 7. Flow channel, 7-1. First flow channel, 7-2. Second flow channel, 8. Main housing, 9. Upper cavity, 10. Guide shell, 10-1. Front guide shell, 10-2. Rear guide shell, 10-3. Water spray port, 1 1. Coupling, 12. Main shaft, 13. Water storage chamber, 14. Mounting cylinder chamber, 15. Pipe seat, 16. First bearing, 17. Annular frustum, 18. Second bearing, 19. Waterproof seal, 20. Stage, 21. Copper nose, 22. Power line tube, 23. Control line tube, 24. Mounting hole, 24-1. Notch, 25. Side plate, 26. Power supply connector, 27. Control connector, 28. Cooling chamber, 29. Drain wheel, 30. Main body, 31. Water inlet, 32. Through hole, 33. Motor stator, 34. Motor rotor, 35. Convex rib, 36. Impeller. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0026] like Figure 1 and Figure 2As shown, the utility model is a water jet propulsion device with an integrated structure, which includes a main shell 8, a controller 2, a motor and a cylindrical guide shell 10. The guide shell 10 is composed of a front guide shell 10-1 and a rear guide shell 10-2 which are coaxial and butted front and back. A flow channel 7 with a water inlet 31 is provided at the lower part of the main shell 8. The flow channel 7 is butted and connected with one end of the barrel cavity of the guide shell 10. A water spray port 10-3 is formed at the other end of the barrel cavity of the guide shell 10. A paddle shaft 6 is passed through the flow channel 7. The front end of the paddle shaft 6 is transmission-connected with the main shaft 12 of the motor. The rear end of the paddle shaft 6 extends into the barrel cavity of the guide shell 10 to fix the impeller. The outer shell of the motor is composed of an end cover 5 and an installation barrel cavity 14 integrally extended from the front end of the main shell 8. One end of the installation barrel cavity 14 is open and sealed with the end cover 5. The motor stator 33, the motor rotor 34 and the main shaft 12 are all installed in the installation barrel cavity to be assembled into a motor. The installation barrel cavity and the end cover can be fastened with common bolts and sealed with a sealing ring. Waterproof, the main shaft 12 is sealed and extended from one end of the bottom wall corresponding to the mounting tube cavity 14, and is connected to the propeller shaft 6 through the coupling 11. The bottom wall of the mounting tube cavity 14 is provided with bearings matching the main shaft 12 at the position where the main shaft 12 passes through and on the end cover 5 to position it, wherein a pipe seat 15 protruding from the bottom wall is provided at the center of the bottom wall of the mounting tube cavity 14, and the main shaft 12 passes through the pipe seat 15 and extends out of the mounting tube cavity 14, and a first bearing 16 and a waterproof seal 19 are provided between the pipe seat 15 and the main shaft 12. As shown in the figure, the waterproof seal 19 is provided on the outside of the first bearing 16 to prevent water from flowing into the first bearing 16 along the main shaft 12, and the waterproof seal of the shaft is the existing technology; a raised annular cone 17 is provided at the center of the inner wall of the end cover 5, and the annular cone 17 is surrounded by a concave hole on the inner wall of the end cover 5 to install a second bearing 18 matching the main shaft 12, and the first bearing 16 and the second bearing 18 can both use deep groove ball bearings, and the waterproof seal 19 can use a waterproof sealing ring. The main shell 8 is also provided with a waterproof upper cavity 9 for accommodating the controller 2. The top of the upper cavity 9 is open, and the wall of the upper cavity 9 facing the installation tube cavity 14 partially overlaps with the bottom wall of the installation tube cavity. The side walls of the upper cavity 9 are provided with waterproof power supply connectors 26 and control connectors 27. The waterproof connectors are of prior art. The power supply connector 26 is externally powered through a power line tube 22. One end of the power line tube 22 is crimped with a copper nose 21 for wiring. The control connector 27 is externally connected to a wired control through a control line tube 23. The waterproofing of the upper cavity 9 can be achieved by filling with glue or installing a top cover 1 to seal the top opening, or by filling with glue and installing the top cover at the same time. In this embodiment, preferably, the upper cavity is filled with glue and the top cover 1 is installed at the same time. The top cover 1 is tightened by screws to cover the opening at the top of the upper cavity.

[0027] The utility model arranges both the motor and the controller in the main shell so that the three become an integrated structure, wherein an installation cylinder cavity is extended from the main shell as the outer shell cavity of the motor, and is assembled into the outer shell of the motor in conjunction with the end cover, the motor stator and rotor and the main shaft are installed in the installation cylinder cavity to assemble into the motor, the motor and the main shell become an integrated structure, the propeller structure is compact and simplified, the built-in motor and controller eliminate the waterproof connection required for the original split structure, the coaxiality of the motor and the main shell is guaranteed, and the main shaft of the motor and the propeller shaft can also have higher transmission efficiency and propulsion efficiency under the coaxial condition; at the same time, the main shell installs the controller through the upper cavity arranged thereon, and the controller is also built into the main shell and its integrated structure, because the upper cavity is waterproof, the controller and the motor are connected by using the wall opening that overlaps the upper cavity and the installation cylinder cavity, and no waterproof sealing is required; the power supply connector and the control connector arranged on the side wall of the upper cavity are both waterproof connectors, wherein the power supply connector is used for an external power supply to supply power to the controller and the motor, and the control connector is used for inputting signals to operate the controller.

[0028] Furthermore, in order to dissipate heat for the upper cavity 9 and the mounting tube cavity 14, a cooling cavity 28 is further provided inside the main shell 8 above the flow channel 7. The top wall of the cooling cavity 28 coincides with the bottom wall of the upper cavity 9, and the side wall portion of the cooling cavity 28 coincides with the corresponding wall of the mounting tube cavity 14. A cooling water inlet is provided at the bottom of the main shell 8 to connect with the cooling cavity 28, and a mounting hole 24 is provided on the inner wall of the cooling cavity 28 to connect with the flow channel 7. The front end of the paddle shaft 6 extends into the cooling cavity 28 through the mounting hole 24, and the main shaft 12 extends into the cooling cavity 28 through the pipe seat 15, and is transmission-connected to the front end of the paddle shaft 6 through the coupling 11 in the cooling cavity. A drainage wheel 29 is also provided on the shaft section of the paddle shaft 6 adjacent to the mounting hole 24 in the cooling cavity 28.

[0029] When the propeller is working, water flows into the cooling chamber from the cooling water inlet, and the upper chamber is cooled by water using the overlapping wall shared by the cooling chamber and the bottom wall of the upper chamber, thereby eliminating the internal heat accumulated in the upper chamber due to the heat generated by the operation of the controller, thereby dissipating the heat of the controller. At the same time, the installation cylinder chamber is cooled by water using the overlapping wall shared by the cooling chamber and the installation cylinder chamber, thereby cooling the motor. The cooled water can be discharged into the flow channel through the installation hole; the drain wheel, driven by the propeller shaft, draws away the water in the cooling chamber, accelerates the discharge of cooling water into the flow channel from the installation hole, thereby increasing the circulation flow rate of the water in the cooling chamber, enhancing the water cooling effect of the cooling chamber on the upper chamber and the installation cylinder chamber, and enhancing the heat dissipation of the controller and the motor. In this embodiment, the drain wheel is small in size and can be preferably manufactured in an integrated manner with the propeller shaft.

[0030] Further, such as Figure 3-8 As shown, the main housing 8 includes a body 30 and a first flow channel plate 3 and a second flow channel plate 4 fixed to the bottom thereof, the mounting cylinder cavity 14 and the upper cavity 9 are both arranged on the body 30, the bottom of the body 30 is provided with a concave cavity opening downward, the first flow channel plate 3 and the second flow channel plate 4 are distributed along the length direction of the body 30 and cover the opening; the flow channel 7 on the main housing 8 is as shown Figure 2 The first flow channel 7-1 and the second flow channel 7-2 are connected in sequence along the water flow direction. The first flow channel plate 3 is provided with a recess 3-2 and its inner wall surface forms the first flow channel 7-1. The recess 3-2 is provided with a lower opening and a side opening connected as the water inlet 31 and the water outlet of the first flow channel 7-1 respectively. The second flow channel plate 4 and the inner wall of the concave cavity of the body 30 above it form the second flow channel 7-2. The first flow channel plate 3 is pressed against the inner wall of the concave cavity of the body 30 corresponding to the second flow channel 7-2 through the recess 3-2 so that the first flow channel 7-1 and the second flow channel 7-2 are connected. The inner wall of the concave cavity of the body 30 is provided with an arc-shaped inner concave stage at the position of pressing against the first flow channel plate 3. 20, the recess 3-2 of the first flow channel plate 3 extends toward one side of the second flow channel plate 4 and forms an arc-shaped narrow side 3-1 matching the stage 20 at the extended end, and the narrow side 3-1 can be in close contact with the stage 20, so that the inner wall of the recess 3-2 of the first flow channel plate 3 and the inner wall of the concave cavity of the main body 30 are flush at the joint; the first flow channel plate 3 and the inner wall of the concave cavity of the main body 30 are respectively provided with notches 24-1 at the joint to form the mounting hole 24; the cooling cavity 28 is surrounded by the first flow channel plate 3 and the inner wall of the concave cavity of the main body 30 above it, and the cooling water inlet is a plurality of parallel strip-shaped through holes 32 opened at one end of the first flow channel plate 3 away from the recess 3-2.

[0031] The first flow channel plate 3 is as follows Figure 7 As shown, it is formed by a U-shaped first bottom plate 3-3 and a first inner plate 3-4 arched in the U-shaped gap, the first bottom plate 3-3 is provided with first mounting holes 3-5 on both sides and is fixed to the bottom of the body 30 by bolts, the first inner plate 3-4 surrounds the recess 3-2 on the first flow channel plate 3, and all the through holes 32 are arranged at the end of the first bottom plate 3-3.

[0032] The second flow channel plate 4 is as follows Figure 8 As shown, it is formed by integrally connecting a V-shaped second bottom plate 4-1 and a second inner plate 4-2 extending upward from the inner side of the V-shaped gap. The second bottom plate 4-1 is provided with second mounting holes 4-3 on both sides and is fixed to the bottom of the main body 30 by bolts. The second inner plate 4-2 is bent and extended upward along the edge of the V-shaped gap of the second bottom plate 4-1 to form a left-right symmetrical curved plate. The top edges on both sides of the curved plate are in close contact with the inner wall of the concave cavity of the main body 30, and together with the inner wall of the concave cavity form a second flow channel 7-2.

[0033] The main shell is connected by a main body and two flow channel plates, and the two flow channel plates are fixedly connected to the bottom of the main body. The flow channel on the main shell is divided into a first and a second flow channel that are connected front and rear. The first flow channel is formed on the inner wall surface of the recess of the first flow channel plate, and the cooling chamber is surrounded by the first flow channel plate and the upper main body recess. A through hole is opened on the first flow channel plate as a cooling water inlet for water to enter the cooling chamber; the second flow channel is surrounded by the second flow channel plate and the inner wall of the main body recess above it; the first flow channel plate is against the inner wall of the main body recess through the recess to achieve the connection between the first flow channel and the second flow channel, and the smooth transition of the inner wall surfaces of the two sections of the flow channel is achieved through the matching of the narrow edge and the step stage. At the same time, a notch is respectively arranged on the first flow channel plate and the inner wall of the main body recess at the joint, and the two notches are spliced ​​to form an installation hole for passing the propeller shaft and cooling chamber drainage.

[0034] Furthermore, in order to dissipate heat from the mounting cylinder cavity, the main shell 8 is provided with a side panel 25 integral with the mounting cylinder cavity 14 on both sides of the left and right sides of the mounting cylinder cavity 14. In this embodiment, both side panels 25 are located on the main body 30 and are formed integrally therewith. The two side panels 25 and the side walls of the mounting cylinder cavity 14 on the same side are surrounded by two open water storage cavities 13. The water storage cavities can store water to dissipate heat from part of the side walls of the mounting cylinder cavity, thereby helping to cool the motor. At the same time, the side wall surface of the mounting cylinder cavity 14 is also provided with a plurality of mutually parallel annular ribs 35 distributed along the axis. The ribs can increase the surface area and improve the heat dissipation effect.

Claims

1. A water jet propulsion device with an integrated structure, comprising a main housing (8), a controller (2), a motor and a cylindrical guide shell (10), wherein a flow channel (7) with a water inlet (31) is provided at the lower part of the main housing (8), the flow channel (7) is butt-connected with one end of a cylindrical cavity of the guide shell (10), and a water jetting port (10-3) is formed at the other end of the cylindrical cavity, a propeller shaft (6) is passed through the flow channel (7), a front end of the propeller shaft (6) is transmission-connected to a main shaft (12) of the motor, and a rear end of the propeller shaft (6) extends into the cylindrical cavity and is fixedly connected to an impeller (36), wherein the impeller shaft (6) is characterized in that The housing of the motor is composed of an end cover (5) and a mounting cylinder cavity (14) integrally extending from the front end of the main housing (8); one end of the mounting cylinder cavity (14) is open and sealed with the end cover (5); the main shaft (12) extends out from one end of the mounting cylinder cavity (14) corresponding to the bottom wall and is transmission-connected with the propeller shaft (6); the bottom wall of the mounting cylinder cavity (14) where the main shaft (12) passes and the end cover (5) are both provided with bearings matching the main shaft (12); the main housing (8) is provided with a waterproof upper cavity (9) for accommodating the controller (2); the wall of the upper cavity (9) facing the mounting cylinder cavity (14) partially overlaps with the bottom wall of the mounting cylinder cavity; the side wall of the upper cavity (9) is provided with a waterproof power supply connector (26) and a control connector (27).

2. The water jet propulsion device of the integrated structure according to claim 1 is characterized in that A tube seat (15) protruding from the bottom wall is provided at the center of the bottom wall of the installation tube cavity (14); the main shaft (12) passes through the tube seat (15) and extends out of the installation tube cavity (14); a first bearing (16) and a waterproof seal (19) are provided between the tube seat (15) and the main shaft (12); the waterproof seal (19) is located outside the first bearing (16) to prevent water from flowing into the first bearing (16) along the main shaft (12); a protruding annular truncated cone (17) is provided at the center of the inner wall of the end cover (5); the annular truncated cone (17) forms a concave hole on the inner wall of the end cover (5) to accommodate a second bearing (18) matching the main shaft (12).

3. The water jet propulsion device of the integrated structure according to claim 2 is characterized in that A cooling chamber (28) is provided inside the main shell (8) above the flow channel (7); the top wall of the cooling chamber (28) overlaps with the bottom wall of the upper chamber (9); the side wall portion of the cooling chamber (28) overlaps with the corresponding wall of the mounting tube chamber (14); a cooling water inlet is provided at the bottom of the main shell (8) to communicate with the cooling chamber (28); a mounting hole (24) is provided on the inner wall of the cooling chamber (28) to communicate with the flow channel (7); the front end of the propeller shaft (6) passes through the mounting hole (24) and extends into the cooling chamber (28); the main shaft (12) passes through the pipe seat (15) and extends into the cooling chamber (28) and is transmission-connected to the front end of the propeller shaft (6) via a coupling (11).

4. The integrated water jet propulsion device according to claim 3 is characterized in that The paddle shaft (6) is provided with a drainage wheel (29) on a shaft section adjacent to the mounting hole (24) in the cooling cavity (28).

5. The integrated water jet propulsion device according to claim 3 is characterized in that The main shell (8) comprises a body (30) and a first flow channel plate (3) and a second flow channel plate (4) fixedly connected to the bottom thereof; the mounting cylinder cavity (14) and the upper cavity (9) are both arranged on the body (30); a concave cavity opening downward is arranged at the bottom of the body (30); the first flow channel plate (3) and the second flow channel plate (4) are distributed along the length direction of the body (30) and cover the opening; the flow channel (7) on the main shell (8) is divided into a first flow channel (7-1) and a second flow channel (7-2) which are connected in sequence along the water flow direction; the first flow channel plate (3) is provided with a concave portion (3-2) and its inner wall surface forms the first flow channel (7-1); the concave portion (3-2) is provided with a lower opening and a side opening which are connected to each other and serve as the first flow channel (7-1) and the second flow channel (7-2) respectively. The first flow channel plate (3) and the inner wall of the concave cavity of the main body (30) above the second flow channel plate (4) are connected to form a water inlet (31) and a water outlet, the second flow channel plate (4) and the inner wall of the concave cavity of the main body (30) above the second flow channel plate (4) are connected to form a water inlet (31) and a water outlet, the second flow channel plate (7-2) is connected to the inner wall of the concave cavity of the main body (30) corresponding to the second flow channel (7-2) through the concave portion (3-2), so that the first flow channel (7-1) and the second flow channel (7-2) are connected to each other, and the first flow channel plate (3) and the inner wall of the concave cavity of the main body (30) are respectively provided with notches at the connection point to form the mounting hole (24); the cooling cavity (28) is formed by the first flow channel plate (3) and the inner wall of the concave cavity of the main body (30) above the first flow channel plate (3), and the cooling water inlet is a through hole (32) opened at one end of the first flow channel plate (3) away from the concave portion (3-2).

6. The integrated water jet propulsion device according to claim 5 is characterized in that The inner wall of the concave cavity of the body (30) is provided with an arc-shaped extending inner concave step (20) at a position abutting against the first flow channel plate (3); the concave portion (3-2) of the first flow channel plate (3) extends toward one side of the second flow channel plate (4) and forms an arc-shaped narrow edge (3-1) matching the step (20) at the extended end; the narrow edge (3-1) can be closely attached to the step (20), so that the inner wall of the concave portion (3-2) of the first flow channel plate (3) and the inner wall of the concave cavity of the body (30) are flush at the joint.

7. The integrated water jet propulsion device according to claim 5 is characterized in that The first flow channel plate (3) is formed by integrally connecting a U-shaped first bottom plate (3-3) and a first inner plate (3-4) arched in the U-shaped gap; the first bottom plate (3-3) is fixedly connected to the bottom of the body (30) by bolts on both sides; the first inner plate (3-4) surrounds a recess (3-2) on the first flow channel plate (3); and the through hole (32) is provided at an end of the first bottom plate (3-3).

8. The integrated water jet propulsion device according to claim 5 is characterized in that The second flow channel plate (4) is formed by integrally connecting a V-shaped second bottom plate (4-1) and a second inner plate (4-2) extending upward from the inner side of the V-shaped gap; the second bottom plate (4-1) is fixedly connected to the bottom of the body (30) by bolts on both sides; the second inner plate (4-2) is bent and extended upward along the edge of the V-shaped gap of the second bottom plate (4-1) to form a left-right symmetrical curved plate; the top edges of the left and right sides of the curved plate are in close contact with the inner wall of the concave cavity of the body (30) and enclose the inner wall of the concave cavity to form a second flow channel (7-2).

9. The integrated water jet propulsion device according to any one of claims 1 to 8, characterized in that The upper cavity (9) is open at the top, and the upper cavity (9) is waterproofed by filling with glue or installing a top cover (1) to seal the open top.

10. The integrated water jet propulsion device according to claim 9, characterized in that The main housing (8) is provided with a side plate (25) integral with the installation cylinder cavity (14) on both left and right sides of the installation cylinder cavity (14); the two side plates (25) and the side wall of the installation cylinder cavity (14) on the same side are combined to form two open water storage cavities (13).

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