Shaftless pump pushing device

Abstract

The utility model discloses a shaftless pump pushing device which comprises an annular guide pipe, a spiral blade, a left stator iron core, a right stator iron core, a left stator coil, a right stator coil, a rotor set and a bearing assembly, the left stator iron core and the right stator iron core are fastened in the annular guide pipe, the bearing assembly is installed in the left stator iron core and the right stator iron core, and an integral cylinder is arranged in the left stator iron core and the right stator iron core. Two ends of the integral cylinder are respectively arranged in bearing assemblies of the left stator core and the right stator core, the blades are arranged on the inner wall of the cylinder, the rotor set is composed of a rotating wall plate, a left rotor and a right rotor, the rotor set is arranged between the left stator core and the right stator core, the rotating wall plate is fixed on the cylinder, the left rotor and the right rotor are fastened on two sides of the rotating wall plate, and axial air gaps are formed between the stators and the rotors. The left motor and the right motor drive the whole cylinder at the same time, the rotating speed is increased, the pushing force can be increased without too large blades, stators and rotors, and the manufacturing cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of ship propulsion technology, specifically to a shaftless pump propulsion device. Background Technology

[0002] Shaftless pump-jet propulsion is a type of marine propulsion device that eliminates the drive shaft of traditional power systems, fundamentally eliminating various noise and other problems associated with shafting. Compared with drive shaft propulsion systems, it has advantages such as simple structure, flexible layout, low noise and vibration, and high propulsion efficiency.

[0003] A shaftless pump propulsion device is an internal rotor propulsion power unit that uses multiple independent blades evenly distributed on the outer edge of the rotor. This design avoids interference from the central drive, resulting in more uniform water flow and lower noise. The size of the blades mounted on the internal rotor is a key factor affecting the driving force of the shaftless pump. The driving force of a shaftless pump is closely related to the blade area. Within a certain range, to ensure sufficient thrust, the larger the blades (larger area), the larger the contact area with the fluid (such as water), the more fluid volume can be propelled, and theoretically, the greater the thrust and the more significant the forward momentum. However, larger blades are not always better. Excessively large blades increase water flow resistance and energy loss, and may also lead to pump instability (such as increased vibration and noise). Excessively large blades increase the difficulty and cost of manufacturing (materials, manufacturing process). Excessively large blades increase the diameter of the internal rotor, leading to an increase in the diameter of the outer stator, and requiring larger bearings between the stator and rotor, thus increasing the manufacturing cost of the shaftless pump propulsion device. This is especially true for high-thrust shaftless pump propulsion devices, where the high manufacturing cost limits the power and thrust of the shaftless pump.

[0004] The shaftless pump pusher motors widely used today are conventional cylindrical submersible motors, which have some drawbacks: the motor rotor is mounted inside the cylindrical hole of the stator core, forming a radial magnetic field structure. The air gap between the stator and rotor is also radial. When the motor rotor rotates, it generates radial centrifugal expansion. Therefore, the air gap between the stator and rotor of a conventional motor must be wide enough. Because the air gap is affected by the radial expansion generated by the rotor rotation, if it is too narrow, it will "rub against the disc". The magnetic reluctance of air is 3000-5000 times greater than that of silicon steel sheet cores. Even a small amount of air gap will occupy most of the magnetomotive force (ampere-turns), especially for large motors. For example, the air gap of a 680 kW 4-pole motor is 1.3 mm. Therefore, conventional cylindrical motors have low efficiency and small torque. Summary of the Invention

[0005] The technical problem to be solved by this invention is to overcome the shortcomings of the prior art and provide a shaftless pump-pumping device with high thrust and high power. This allows for a significant increase in the thrust and power of the shaftless pump-pumping device without the need to manufacture excessively large blades, stators, and rotors, thereby improving motor efficiency and increasing torque; especially for shaftless pump-pumping devices with high thrust, the manufacturing cost is reduced.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The shaftless pump pusher device includes: an annular guide tube, helical blades, left and right stator cores, left and right stator coils, rotor assembly, and bearing assembly. The left and right stator cores are fastened to the annular guide tube with screws. The left and right stator coils are installed in the winding slots of the left and right stator cores. The bearing assembly is installed inside the left and right stator cores. The characteristic is that: the left and right stator cores are provided with an integral cylinder. The two ends of the integral cylinder are respectively installed into the bearing assemblies of the left and right stators. The helical blades are installed on the inner wall of the integral cylinder. The rotor assembly consists of a rotating wall plate and left and right rotors. The rotor assembly is set between the left and right stator cores. The shaft hole of the rotating wall plate is fixed to the integral cylinder. The left and right rotors are fastened to both sides of the central rotating wall plate with screws. The left and right rotors are annularly fitted on the cylinder. An axial air gap is formed between the stator and rotor, which becomes a left and right combined motor, forming a shaftless pump pusher device.

[0007] The left and right motors have their large and small magnetic poles connected in parallel, plus a dual-motor linkage connection ( Figure 5 (Route map)

[0008] The left motor's phase a connector and the right motor's large and small magnetic poles phase c connector are connected in parallel to form the combined motor's phase A.

[0009] The left motor's B-phase head and the right motor's B-phase head are connected in parallel to form a combined motor B-phase.

[0010] The large and small magnetic poles (C phase) of the left motor are connected in parallel with the a phase of the right motor to form the C phase of the combined motor.

[0011] The left and right stator coils and transformer oil are housed in a sealed space constructed with an epoxy resin cover, annular conduit, and stator core.

[0012] The integral cylinder is provided with 1-5 sets of blades.

[0013] An air gap adjustment screw is provided between the annular guide tube and the stator core.

[0014] In this shaftless pump pusher device, the left and right stator cores are equipped with integral cylinders. The two ends of the integral cylinders are respectively installed in the bearing assemblies of the left and right stator cores. The spiral blades are installed on the inner wall of the integral cylinder. The rotor assembly consists of a rotating wall plate and left and right rotors. The rotor assembly is set between the left and right stator cores. The shaft hole of the rotating wall plate is fixed to the integral cylinder. The left and right rotors are fastened to both sides of the rotating wall plate with screws. The left and right rotors are ring-shaped and fitted on the cylinder to form left and right motors, which together form the shaftless pump pusher device. Due to the structural relationship between the rotor and stator of the left and right motors, the magnetic fields of the stator and rotor are axial, and the air gap between them is also axial. The radial centrifugal expansion generated by the high-speed rotation of the rotor is unrelated to the axial air gap. The axial air gap is not affected by the radial expansion generated by the rotor rotation and can be significantly narrowed. The magnetic reluctance of air is 3000-5000 times greater than that of silicon steel core. Even a small air gap will occupy most of the magnetomotive force (ampere-turns), especially in high-power motors. For example, the air gap of a 680 kW 4-pole conventional motor is 1.3 mm. Regardless of the speed, the air gap between the stator and rotor of this combined electric motor is only 0.4-0.5mm, preventing "plate rubbing." This is an advantage of this combined electric motor in improving energy utilization efficiency, which is much higher than that of conventional submersible electric motors. Its energy-saving effect will be very significant. The parallel connection of the large and small magnetic poles of the left and right motors, along with the dual-motor linkage, increases the torque and power of the motor, thereby improving energy utilization efficiency. Multiple sets of blades are set inside the overall cylinder, driven simultaneously by the left and right motors, enhancing the driving force. The rotation speed of the cylinder and multiple sets of blades increases, and the water flow inside the cylinder is accelerated through multiple stages. A high-speed water jet is ejected from the cylinder outlet, greatly increasing the power and driving force of the shaftless pump. For shaftless pump pushers with high thrust, it is not necessary to manufacture excessively large blades, stators, and rotors to increase the driving force of the shaftless pump pusher, thus reducing manufacturing costs.

[0015] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the shaftless pump pusher device.

[0017] Figure 2 This is a structural diagram showing the positional relationship between the rotor, rotating wall plate, integral inner cylinder, and stator of the shaftless pump pusher device.

[0018] Figure 3 This is a structural diagram showing the positional relationship between the overall inner cylinder and the left and right stators.

[0019] Figure 4 This is a structural diagram showing the positional relationship between the integral inner cylinder and the rotating wall panels.

[0020] Figure 5 This is a schematic diagram of the planar wiring of the left and right combined motors.

[0021] Figure 6 This is a schematic diagram of the magnetic field structure of the large and small poles of a 4-pole electric motor. Detailed Implementation

[0022] refer to Figure 1 —— Figure 6 To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0023] The shaftless pump pusher includes: an annular guide tube 1, a spiral blade 3, left and right stator cores 5 and 10, left and right stator coils, a rotor assembly, and a bearing assembly 4. The left and right stator cores 5 and 10 are fastened to the annular guide tube 1 with dovetail screws. The left and right stator coils are installed in the winding grooves of the left and right stator cores 5 and 10. The bearing assembly 4 is installed inside the left and right stator cores 5 and 10. The inner cavity of the left and right stator cores 5 and 10 is provided with an integral cylinder 2, and the two ends of the integral cylinder 2 are respectively inserted into the left and right stator cores 5 and 10. Inside the bearing assembly 4 of 0, a spiral blade 3 is provided on the inner wall of the integral cylinder 2. The rotor group consists of a rotating wall plate 7, left and right rotors 6 and 8. The rotor group is located between the left and right stator cores 5 and 10. The shaft hole of the rotating wall plate 7 is fixed on the integral cylinder 2. The left and right rotors 6 and 8 are fastened to both sides of the rotating wall plate 7 with screws. The left and right rotors 6 and 8 are rings fitted on the cylinder 2, forming axial air gaps 12 and 11, which become left and right combined motors, forming a shaftless pump push device.

[0024] The left and right motors have their large and small magnetic poles connected in parallel, plus a dual-motor linkage connection ( Figure 5 (Route map)

[0025] The left motor's a-phase connector 19 and the right motor's large and small magnetic poles 21 and 22's c-phase connector 20 are connected in parallel to form the A-phase of the combined motor;

[0026] The left motor's B-phase connector 17 and the right motor's B-phase connector 26 are connected in parallel to form a combined motor B-phase;

[0027] The parallel connection 25 of the left motor's large and small magnetic poles 28 and 27 (phase C) is connected in parallel with the right motor's phase a connection 24 to form the phase C of the combined motor.

[0028] The common neutral wire for the left motor is 18, and the common neutral wire for the right motor is 23.

[0029] The left and right stator coils and transformer oil are housed in a sealed space constructed with an epoxy resin cap 9, an annular conduit 1, and stator cores 5 and 10.

[0030] The integral cylindrical tube 2 is equipped with 1-5 sets of blades.

[0031] Air gap adjusting screws 1-3 and 1-4 are provided between the annular guide tube 1 and the stator core 5 and 10. The width and narrowness of the two air gaps 12 and 11 can be adjusted by adjusting screws 1-3 and 1-4.

[0032] In this shaftless pump pusher device, due to the structural relationship between the rotors 6 and 8 and the stators 5 and 10 of the left and right motors, the magnetic fields of the stator and rotor are axial, and the air gaps 12 and 11 between them are also axial. The radial centrifugal expansion generated by the high-speed rotation of rotors 6 and 8 is unrelated to the axial air gaps 12 and 11. Since the axial air gaps 12 and 11 are not affected by the radial expansion generated by the rotation of rotors 6 and 8, they can be significantly narrowed. The magnetic reluctance of air is 3000-5000 times greater than that of silicon steel cores. Even a small gap 12 and 11 will occupy most of the magnetomotive force (ampere-turns). This is especially true for high-power shaftless pump pushers. For example, the air gap of a 680 kW 4-pole motor is 1.3 mm. Regardless of the motor's speed, as long as the air gap 12 and 11 between the stator and rotor is only 0.4-0.5 mm, "plate rubbing" will not occur. This combined electric... The air gaps 12 and 11 can reach 0.4-0.5mm, which is an advantage of the combined electric motor in improving energy utilization efficiency. It is much higher than that of conventional submersible electric motors, and its energy-saving effect will be very significant. The parallel connection of the large and small magnetic poles of the left and right motors and the linkage of the two motors increase the torque and the power of the motor, thereby improving energy utilization efficiency. Multiple sets of blades 3 are set inside the cylinder 2. The entire cylinder 2 is driven by the left and right motors simultaneously, which enhances the driving force and speeds up the rotation of the entire cylinder 2 and the multiple sets of blades 3. The water flow inside the cylinder 2 is accelerated through multiple stages, and a high-speed water jet is ejected from the outlet of the cylinder 2, which greatly increases the power and driving force of the shaftless pump. For a shaftless pump with high thrust, it is not necessary to manufacture excessively large blades 3, left and right stators 5 and 10, and left and right rotors 6 and 8 to increase the driving force of the shaftless pump, thereby reducing manufacturing costs.

[0033] The left and right motors have their large and small magnetic poles connected in parallel and linked together. Figure 5 Route map:

[0034] The left motor's a-phase connector 19 and the right motor's large and small magnetic poles 21 and 22, c-phase connector 20 are connected in parallel to form the A-phase of the combined motor;

[0035] The left motor's B-phase connector 17 and the right motor's B-phase connector 26 are connected in parallel to form a combined motor B-phase;

[0036] The parallel connection 25 of the left motor's large and small magnetic poles 28 and 27 (phase C) is connected in parallel with the right motor's phase a connection 24 to form the phase C of the combined motor.

[0037] The common neutral wire for the left motor is 18, and the common neutral wire for the right motor is 23.

[0038] The magnetic field structure of the large and small poles of the 4-pole electric motor in this design (see...) Figure 6The three small magnetic poles arranged side by side are phases a, b, and c. The adjacent large magnetic pole coil 5-2 is connected in parallel with phase c 5-5. The four sets of large and small magnetic poles connected in series form a 4-pole motor. The dual-motor configuration is as follows: Figure 5 In the circuit connection, since the area of ​​the large magnetic pole 5-1 is 2.2 times the area of ​​the small magnetic poles a, b, and c, the magnetic force of the small magnetic poles is 1, and the magnetic force of the large magnetic pole 5-1 is 2.2. When the rotating magnetic field of the left motor rotates from phase a 5-3 to phase b 5-4, the magnetic force is 1. When phase b 5-4 rotates to phase c 5-5, the magnetic force is also 1. However, when rotating from phase c 5-5 to phase a 5-3, the magnetic force of the large magnetic pole 5-1 is added, resulting in a magnetic force of 3.2. The dual-motor linkage is achieved by reversing the connection of phase a 5-3 and phase c 5-5. Therefore, the sum of the magnetic forces for the dual-motor linkage is 4.2 for phase A, 2 for phase B, and 4.2 for phase C, with an average magnetic force of 3.46 per phase. Starting an electric motor requires 3 to 4 times the starting current. This 3.46 times electromagnetic force just compensates for the starting current, so it can start with just the rated current. Another major advantage of the large and small magnetic pole structure is energy saving. In the large magnetic pole 5-1 coil of the large magnetic pole structure, the current flowing through the large magnetic pole 5-1 coil and the small magnetic pole coil is the same. For example, the single-unit line current of the design scheme of this patent is 6.6 amps and the power is 3 kilowatts. Due to the addition of the current of the large magnetic pole, the current per phase is (6.6 amps x 4) / 3 = 8.8 amps (the current increases by 33%). However, the magnetic force (power) generated by the addition of this large magnetic pole current is 3.46 / 2 = 1.73 times greater. This means the benefit exceeds the expenditure by 1.73 - 1.33 = 40%, which is equivalent to the benefit generated without increasing the load current, thus achieving energy saving. Furthermore, the power increase generated by shortening the air gaps 12 and 11, according to the air gap calculation formula, can increase the power increment by 40%. The total power of the dual-motor linkage disc submersible motor designed in this patent can reach 6 kW × (1 + 0.4 + 0.4) = 10.8 kW. This type of dual-motor linkage disc motor with a large magnetic pole structure may be the main direction for future motor development. Example

[0039] The shaftless pump pusher includes: an annular guide tube 1, a spiral blade 3, left and right stator cores 5 and 10, left and right stator coils, a rotor assembly, and a bearing assembly 4. The left and right stator cores 5 and 10 are fastened to the annular guide tube 1 with dovetail screws. The left and right stator coils are installed in the winding slots of the left and right stators. The bearing assembly 4 is installed in the inner cavity of the left and right stator cores 5 and 10. An integral cylinder 2 is provided inside the inner cavity of the left and right stator cores 5 and 10, and the integral cylinder 2 is divided at both ends. Do not install it into the left and right stator bearing assemblies 4. The inner wall of the integral cylinder 2 is provided with spiral blades 3. The rotor assembly consists of a rotating wall plate 7, left and right rotors 6 and 8. The rotor assembly is set between the left and right stator cores 5 and 10. The shaft hole of the rotating wall plate 7 is fixed on the integral cylinder 2. The left and right rotors 6 and 8 are fastened to both sides of the rotating wall plate 7 with screws. The left and right rotors 6 and 8 are rings fitted on the cylinder 2 to form a left and right combined motor, which constitutes a shaftless pump push device.

[0040] The annular conduit 1 is divided into left and right parts, connected by four closing screws 1-1. Its shape is similar to the cross-section of an airfoil, enclosing the cylinder 2 and the helical blades 3. Electromagnetic coils 5-2 (stator 5, 10) are arranged on the inner wall of the conduit 1 to form a rotating magnetic field. The motor is divided into stator and rotor parts. The stator 5, 10 is supported by bearing 4 and fixed to the inner wall of the conduit 1. Current is passed through it to generate a magnetic field. The rotor 6, 8 and the rotating wall plate 7 are installed on the cylinder 2 and fixed in the center of the two stator cores.

[0041] Two bearings, number 4, are fitted into the inner cavities of the stator cores 5 and 10 at both ends, and are tightened with screws at both ends.

[0042] When the motor starts, rotors 6 and 8 drive cylinder 2 and blades 3 to rotate synchronously, converting electrical energy into thrust.

[0043] The shaftless pump pusher uses multiple sets of blades ( Figure 1 The blades (consisting of three sets) are evenly distributed on the inner wall of the cylinder 2. This design avoids interference from the central drive, resulting in a more uniform water flow and lower noise.

[0044] The annular conduit 1, the two stators 5 and 10, the rotors 6 and 8, the cylinder 2, the bearing component 4, the rotating wall plate 7, and other components are all made of steel.

[0045] A rotating wall plate 7 is welded to the center of the cylinder 2. Two annular rotors 6 and 8 are locked to the rotating wall plate 7 on each side of the wall plate with 8 hex screws. The annular rotors 6 and 8 are permanent magnet rotors or cast aluminum squirrel cage rotors. Since it is inconvenient to directly fix the annular rotors 6 and 8 to the cylinder 2, they are fixed to the cylinder 2 by the rotating wall plate 7.

[0046] The shaft hole of the rotating wall panel 7 is 40-50 microns smaller than the diameter of the cylinder 2. The cylinder 2 is pressed in by a press with a capacity of 200 tons or more and then processed into shape.

[0047] The inlay grooves on planes 5 and 10 of the stator core and the dovetail grooves on the back are made by wire cutting using silicon steel strip turntables;

[0048] The left and right stator irons 5 and 10 are fastened to the annular guide tube 1 with multiple dovetail screws.

[0049] The three-phase winding leads of the left stator coil are connected in reverse phase to the three-phase winding leads of the right stator coil. Therefore, the two opposing stator cores 5 and 10 generate rotating magnetic fields in the same direction, inducing the corresponding rotors 6 and 8 to rotate synchronously in the same direction. The three-phase winding leads of the two stator coils need to be led out of the machine using sealed joints.

[0050] Air gap adjusting screws 1-3 and 1-2 are installed between the annular guide tube 1 and the stator cores 5 and 10 of this machine. These screws adjust the width of the two air gaps 12 and 11. The four adjusting screws 1-3 and 1-2 are fixed in the grooves of the outer shell of the annular guide tube 1. The other end of adjusting screw 1-3 is installed inside the left and right stator cores 5 and 10 to widen the air gaps 12 and 11. The other end of adjusting screw 1-2 contacts the surface of the left and right stator cores 5 and 10 to push against the stator cores, thus narrowing the air gaps 12 and 11. This ensures that the air gap between the stator and rotor on both sides reaches the designed 0.2mm. After the width of the air gaps 12 and 11 meets the requirements, the machine is tested, disassembled, and then sealed with epoxy resin 9 for waterproofing. After the epoxy resin 9 hardens, the "pulling" screws and "pushing" screws lose their function.

[0051] This utility model provides a power device that can be used as a high-power propulsion device for ships, submarines, and other vessels. It can also be used in land-based and aviation engines, as well as in household appliances, agricultural irrigation, urban water supply and drainage, and industrial production. All of these applications fall within the scope of protection of this invention.

Claims

1. A shaftless pump pusher device, comprising: an annular guide tube, helical blades, left and right stator cores, left and right stator coils, a rotor assembly, and a bearing assembly, wherein the left and right stator cores are fastened to the annular guide tube with screws, the left and right stator coils are installed in the winding slots of the left and right stator cores, and the bearing assembly is installed inside the left and right stator cores, characterized in that: The left and right stator cores are equipped with integral cylinders. The two ends of the integral cylinders are respectively installed in the bearing assemblies of the left and right stator cores. The spiral blades are installed on the inner wall of the integral cylinder. The rotor assembly consists of a rotating wall plate and left and right rotors. The rotor assembly is set between the left and right stator cores. The shaft hole of the rotating wall plate is fixed to the integral cylinder. The left and right rotors are fastened to both sides of the rotating wall plate with screws. The left and right rotors are ring-shaped and fitted on the cylinder. An axial air gap is formed between the stator and rotor, which becomes a left and right combined motor, forming a shaftless pump push device.

2. The shaftless pump pusher device as described in claim 1, characterized in that: The left and right combined motors are connected in parallel with their large and small magnetic poles, and a dual-motor linkage is also provided: The left motor's phase a connector and the right motor's phase c connector (with large and small magnetic poles) are connected in parallel to form phase A of the combined motor; The left motor's B-phase head and the right motor's B-phase head are connected in parallel to form a combined motor B-phase. The left motor's large and small magnetic poles (C phase) are connected in parallel with the right motor's (A phase) to form the C phase of the combined motor.

3. The shaftless pump pusher device as described in claim 1, characterized in that: The left and right stator coils and transformer oil are housed in a sealed space constructed with an epoxy resin cover, annular conduit, and stator core.

4. The shaftless pump pusher device as described in claim 1, characterized in that: The integral cylinder is provided with 1-5 sets of blades.

5. The shaftless pump pusher device as described in claim 1, characterized in that: An air gap adjustment screw is provided between the annular guide tube and the stator core.

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