Direct drive permanent magnet synchronous motor for mud pump

Abstract

The utility model belongs to motor technical field especially is a kind of direct-drive permanent-magnet synchronous motor for slurry pump, including motor main body and the ventilator of installation at its air inlet part;Motor main body, including shell, stator, rotor, universal joint shaft device, expansion sleeve, connecting flange and terminal box, the stator fixed assembly is in the inside of shell, the rotor rotatably is set on stator, and keep preset air gap between stator.This utility model drives slurry pump by motor body directly through universal joint shaft device and expansion sleeve, completely cancels the intermediate transmission link such as speed reducer, belt pulley, significantly improves transmission efficiency, reduces energy consumption, reduces equipment floor area and noise simultaneously, and the use of universal joint shaft device can effectively compensate the radial, angular alignment error between motor and pump body caused by vibration, greatly reduces the additional load of bearing and shaft, prolongs the service life of motor and slurry pump.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a direct-drive permanent magnet synchronous motor for mud pumps. Background Technology

[0002] Mud pumps are core equipment in fields such as oil drilling, mining transportation, and river dredging. They operate in extremely harsh environments and often face severe challenges such as high loads, strong vibrations, highly corrosive media, and high dust content in the air. Traditional drive solutions usually adopt an indirect transmission mode of "ordinary asynchronous motor + gearbox + pulley or coupling". The gearbox, belt and other intermediate links not only reduce transmission efficiency and increase energy consumption, but are also high-risk points for failure, requiring frequent maintenance and posing a risk of oil leakage. Therefore, we propose a direct-drive permanent magnet synchronous motor for mud pumps to solve the above problems. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this utility model provides a direct-drive permanent magnet synchronous motor for mud pumps, which solves the problems mentioned in the background section.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0007] A direct-drive permanent magnet synchronous motor for a mud pump includes a motor body and a ventilator installed at its air inlet.

[0008] The motor body includes a housing, a stator, a rotor, a universal joint, a sleeve, a connecting flange, and a junction box. The stator is fixedly assembled inside the housing, and the rotor is rotatably mounted on the stator, maintaining a preset air gap between them. The universal joint is connected to the output end of the rotor via the sleeve. The connecting flange is fixed to the end of the motor housing, and the junction box is fixedly installed on the outer wall of the housing.

[0009] A ventilator includes a fan body mounted on a housing, an air duct installed at the air inlet of the fan body, a mounting plate fixed inside the air duct, a frame mounted on the mounting plate, a filter screen fixed inside the frame, and a cleaning component for cleaning the filter screen provided inside the air duct.

[0010] Furthermore, the cleaning assembly includes two bidirectional lead screws rotatably connected inside the duct via bearings. Two cleaning brushes are threaded onto the two bidirectional lead screws, and the brush surfaces of the cleaning brushes are all in contact with the outer surface of the filter screen. The front of the mounting plate has two strip-shaped through slots for making way for the cleaning brushes. The duct is equipped with a drive mechanism inside for driving the two bidirectional lead screws to rotate synchronously.

[0011] Furthermore, four telescopic covers are fixed inside the strip-shaped channel, and the other end of each telescopic cover is fixedly connected to a corresponding cleaning brush. Two telescopic covers are fixed between two cleaning brushes.

[0012] Furthermore, the drive mechanism includes two connecting plates fixed inside the duct. The side walls of the connecting plates are rotatably connected to a rotating shaft via bearings. The surface of the rotating shaft is fixed with a driving bevel gear, and the surface of the bidirectional lead screw is fixed with a driven bevel gear. The driven bevel gears are respectively meshed with the corresponding driving bevel gears. A dual-axis motor is fixed inside the duct, and one end of each of the two rotating shafts is fixedly connected to the output end of the dual-axis motor.

[0013] Furthermore, the frame is equipped with two sets of snap-fit ​​assemblies that can fix it to the mounting plate. The snap-fit ​​assembly includes three guide rods fixed to the frame, and the surfaces of the three guide rods are slidably fitted with snap-fit ​​plates adapted to the mounting plate. The snap-fit ​​plates are snap-fitted and fixed to the mounting plate. Three springs are fixed to one side wall of the snap-fit ​​plate, and the other end of each spring is fixedly connected to the frame. Two telescopic covers are fixed to the snap-fit ​​plate, and the other end of each telescopic cover is fixedly connected to the frame.

[0014] Furthermore, a protective frame is fixed to one side wall of the air duct, and protective inclined plates are fixed at equal intervals inside the protective frame.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a direct-drive permanent magnet synchronous motor for mud pumps, which has the following advantages:

[0017] This invention utilizes a motor body that directly drives the mud pump via a universal joint and expansion sleeve, completely eliminating intermediate transmission links such as the gearbox and pulleys. This significantly improves transmission efficiency, reduces energy consumption, and decreases equipment footprint and noise. Furthermore, the universal joint effectively compensates for radial and angular alignment errors between the motor and pump body caused by vibration, greatly reducing the additional load on bearings and shafts and extending the service life of both the motor and mud pump. A cleaning component is installed on the ventilation duct for motor cooling, automatically cleaning dust adhering to the filter screen surface. This prevents reduced airflow and motor overheating due to filter clogging, ensuring continuous cooling. Additionally, since the filter screen is installed inside the duct via a snap-fit ​​mechanism, the frame and filter screen can be easily removed for replacement or deep cleaning, simplifying operation and saving time during subsequent maintenance. Attached Figure Description

[0018] Figure 1 This is a first-view schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a second-view schematic diagram of the overall structure of this utility model;

[0020] Figure 3 This is a first-view schematic diagram of the duct structure of this utility model;

[0021] Figure 4 This is a second-view schematic diagram of the duct structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the cleaning brush structure of this utility model;

[0023] Figure 6 This is a schematic diagram of the mounting plate structure of this utility model;

[0024] Figure 7 This is a schematic diagram of the snap-fit ​​assembly structure of this utility model.

[0025] In the diagram: 1. Motor body; 11. Housing; 12. Stator; 13. Rotor; 14. Universal joint; 15. Expansion sleeve; 16. Connecting flange; 17. Junction box; 2. Fan; 21. Fan body; 22. Air duct; 23. Mounting plate; 24. Frame; 25. Filter screen; 26. Cleaning assembly; 261. Two-way lead screw; 262. Cleaning brush; 263. Strip groove; 264. Drive mechanism; 2641. Connecting plate; 2642. Shaft; 2643. Driving bevel gear; 2644. Driven bevel gear; 2645. Dual-shaft motor; 265. Telescopic cover one; 266. Telescopic cover two; 27. Snap-fit ​​assembly; 271. Guide rod; 272. Clamping plate; 273. Spring; 274. Telescopic cover three; 28. Protective frame; 29. ​​Protective inclined plate. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example

[0028] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, an embodiment of the present invention provides a direct-drive permanent magnet synchronous motor for a mud pump, including a motor body 1 and a ventilator 2 installed at its air inlet;

[0029] The motor body 1 includes a housing 11, a stator 12, a rotor 13, a universal joint 14, a sleeve 15, a connecting flange 16, and a junction box 17. The stator 12 is fixedly assembled inside the housing 11. The rotor 13 is rotatably mounted on the stator 12 and maintains a preset air gap with the stator 12. The universal joint 14 is connected to the output end of the rotor 13 through the sleeve 15. The connecting flange 16 is fixed to the end of the motor housing 11. The junction box 17 is fixedly installed on the outer wall of the housing 11.

[0030] The ventilator 2 includes a fan body 21 mounted on the outer casing 11. A duct 22 is installed at the air inlet of the fan body 21. A protective frame 28 is fixed to one side wall of the duct 22. Protective inclined plates 29 are fixed at equal intervals inside the protective frame 28. The cooperation of the protective frame 28 and multiple protective inclined plates 29 can form a louver structure, which can reduce the possibility of dust and lint adhering to the filter screen 25 and also provide rain protection. A mounting plate 23 is fixed inside the duct 22. A frame 24 is installed on the mounting plate 23. The filter screen 25 is fixed inside the frame 24. A cleaning component 26 for cleaning the filter screen 25 is provided inside the duct 22.

[0031] The working principle and usage of this utility model are as follows: During operation, an external power supply is connected to the windings of the stator 12 through the junction box 17. After three-phase alternating current is applied to the windings, a rotating magnetic field is generated. The rotor 13, due to its embedded permanent magnet, forms a constant permanent magnetic field. Under the electromagnetic force of the rotating magnetic field, the rotor 13 rotates synchronously with the rotating magnetic field. At this time, the synchronous characteristic is achieved, and the conversion of electrical energy into mechanical energy is completed. The rotational power output by the rotor 13 is transmitted to the universal joint 14 through the expansion sleeve 15. The expansion sleeve 15, through elastic deformation, tightly grips the output end of the rotor 13 and the universal joint 14, realizing keyless rigid transmission and avoiding slippage during power transmission. The universal joint 14 transmits power to the drive shaft of the mud pump. At the same time, its universal structure can compensate for the installation deviation between the motor and the mud pump, ensuring smooth power transmission. The connecting flange 16 is connected to the mud pump via bolts. The pump main unit is fixed to ensure the coaxiality and overall stability of the motor and pump body, while the outer casing 11 provides protection for core components such as the stator 12 and rotor 13, isolating them from external impurities and moisture. When the motor body 1 is running, the fan 2 installed at its air inlet can dissipate heat from the inside of the motor body 1. The filter 25 installed inside the air duct 22 at the air inlet of the fan 2 can filter out dust, lint and other impurities in the outside air, preventing them from entering the inside of the motor body 1. The air that enters the motor body 1 will be discharged through its air outlet. The subsequent operation cleaning component 26 can clean the dust, lint and other impurities adhering to the surface of the automatic filter 25, preventing them from affecting the air intake of the air duct 22 and ensuring the heat dissipation efficiency of the motor body 1 during operation.

[0032] In addition, the stator 12 includes an iron core formed by stacking silicon steel sheets, and windings wound in the iron core slots according to a preset pattern. A 220V, 300W explosion-proof and moisture-proof heating strip is fixed on the outer circle of the motor coil lead end. When the external ambient temperature is lower than the allowable operating temperature, or when frost condenses inside the motor due to low temperature, or when the machine is stopped, the power supply needs to be turned on to heat up and keep the motor warm to prevent the motor from getting damp and reducing its insulation performance, thereby affecting equipment safety. The rotor 13 includes an iron core and permanent magnets fixed to the iron core. The permanent magnets form a constant permanent magnetic field. The iron core is made of stacked whole round sheets stamped from high-quality cold-rolled silicon steel sheets. The iron core as a whole is integrated with the support. The rotor 13 is press-fitted with an interference fit and the iron core is pressed by aluminum alloy end plates and arc keys at both ends. The iron core is tightened and locked with a pull screw. The rotor 13 adopts a built-in V-shaped magnetic circuit structure. The internal magnets are made of high-quality neodymium iron boron permanent magnet material. The expansion sleeve 15 is a split elastic structure. The rotor 13 and the universal joint shaft 14 are keyless clamped and fixed by the elastic deformation generated by the fastener locking. The connecting flange 16 is provided with connecting holes distributed along the circumference for detachable connection with the corresponding flange of the mud pump host. The junction box 17 is provided with insulated terminals. The lead wire of the winding passes through the motor housing 11 and is electrically connected to the terminals. The junction box 17 has a sealed protective structure.

[0033] like Figure 4 As shown, in some embodiments, the cleaning assembly 26 includes two bidirectional lead screws 261 rotatably connected to the inside of the duct 22 via bearings. Two cleaning brushes 262 are threaded onto the two bidirectional lead screws 261. To ensure the smooth movement of the cleaning brushes 262, a guide rail is provided inside the duct 22 to guide the cleaning brushes 262; however, the guide rail is not shown in the figure. The brush surfaces of the cleaning brushes 262 are all in contact with the outer surface of the filter screen 25. Two strip-shaped grooves 263 are provided on the front of the mounting plate 23 to allow space for the cleaning brushes 262. Four telescopic covers 265 are fixed inside the strip-shaped grooves 263. The other end of each telescopic cover 265 is fixedly connected to a corresponding cleaning brush 262. Two telescopic covers 266 are fixed between two cleaning brushes 262. The strip-shaped grooves 263 on the mounting plate 23 provide clearance for the movement of the cleaning brushes 262. Simultaneously, the telescopic covers 265 inside the strip-shaped grooves 263 and the telescopic covers 266 between the cleaning brushes 262 provide clearance for the movement of the cleaning brushes 262. The 6 will extend and retract synchronously with the movement of the cleaning brush 262, thereby preventing impurities from entering the interior of the air duct 22. The interior of the air duct 22 is equipped with a drive mechanism 264 for driving the two bidirectional lead screws 261 to rotate synchronously. In use, the drive mechanism 264 can drive the two bidirectional lead screws 261 to rotate synchronously. Since the cleaning brush 262 is threadedly connected to the bidirectional lead screw 261, and the thread of the bidirectional lead screw 261 is bidirectional, the upper and lower cleaning brushes 262 will reciprocate linearly along the bidirectional lead screw 261. Since the brush surface of the cleaning brush 262 is in contact with the outer surface of the filter screen 25, the dust, lint and other impurities attached to the surface of the filter screen 25 can be removed during its reciprocating movement. At the same time, the ventilator 2 can be started to reverse the airflow to prevent dust and other impurities from passing through the filter screen 25 and entering the interior of the air duct 22. Although the reverse airflow of the ventilator 2 will result in a sharp reduction in air volume, insufficient air pressure and extremely low operating efficiency, it is sufficient to prevent dust penetration.

[0034] like Figure 4 As shown, in some embodiments, the drive mechanism 264 includes two connecting plates 2641 fixed inside the duct 22. The sidewalls of the connecting plates 2641 are rotatably connected to rotating shafts 2642 via bearings. The surfaces of the rotating shafts 2642 are fixed with driving bevel gears 2643, and the surfaces of the bidirectional lead screws 261 are fixed with driven bevel gears 2644. The driven bevel gears 2644 mesh with the corresponding driving bevel gears 2643. A dual-axis motor 2645 is fixed inside the duct 22. One end of each of the two rotating shafts 2642 is fixedly connected to the output end of the dual-axis motor 2645. In use, after the dual-axis motor 2645 is started, it will drive the two rotating shafts 2642 to rotate synchronously. Since the driving bevel gears 2643 on the rotating shafts 2642 mesh with the driven bevel gears 2644 on the bidirectional lead screws 261, the two bidirectional lead screws 261 can be driven to rotate synchronously.

[0035] like Figure 7 As shown, in some embodiments, the frame 24 is equipped with two sets of snap-fit ​​assemblies 27 that can fix it to the mounting plate 23. The snap-fit ​​assembly 27 includes three guide rods 271 fixed to the frame 24. The surfaces of the three guide rods 271 are slidably fitted with clamping plates 272 that are adapted to the mounting plate 23. The clamping plates 272 are snap-fitted and fixed to the mounting plate 23. Three springs 273 are fixed to one side wall of the clamping plate 272. The other ends of the springs 273 are all fixedly connected to the frame 24. Two telescopic covers 274 are fixed to the clamping plate 272. The other ends of the telescopic covers 274 are all fixedly connected to the frame 24. The function of the telescopic covers 274 is to protect the guide rods 271 and springs 273 and prevent dust, lint, and other impurities in the air from entering the interior of the duct 22. To disassemble the filter screen 25, after moving the two cleaning brushes 262 until they do not interfere with the movement of the frame 24, the clamping plates 272 can be moved by both hands. When the clamping plates 272 move, the springs 273 will be compressed, and the clamping plates 272 will disengage from the mounting plate 23. After the frame 24 is released from its restriction, it can be removed. During installation, repeat the above operation. After placing the frame 24 back into the recess on the front of the mounting plate 23, the two clamping plates 272 can be released. Then, under the restoring force of the compressed springs 273, the clamping plates 272 will be reset. After the clamping plates 272 are reset, they will re-engage with the mounting plate 23, thus fixing the frame 24 and the filter screen 25.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A direct-drive permanent magnet synchronous motor for a mud pump, characterized in that: Includes the motor body (1) and the ventilator (2) installed at its air inlet; The motor body (1) includes a housing (11), a stator (12), a rotor (13), a universal joint (14), a sleeve (15), a connecting flange (16), and a junction box (17). The stator (12) is fixedly assembled inside the housing (11). The rotor (13) is rotatably mounted on the stator (12) and maintains a preset air gap with the stator (12). The universal joint (14) is connected to the output end of the rotor (13) through the sleeve (15). The connecting flange (16) is fixed to the end of the motor housing (11). The junction box (17) is fixedly installed on the outer wall of the housing (11). The ventilator (2) includes a fan body (21) mounted on a housing (11). A duct (22) is installed at the air inlet of the fan body (21). An installation plate (23) is fixed inside the duct (22). A frame (24) is installed on the installation plate (23). A filter screen (25) is fixed inside the frame (24). A cleaning component (26) for cleaning the filter screen (25) is provided inside the duct (22).

2. The direct-drive permanent magnet synchronous motor for a mud pump according to claim 1, characterized in that: The cleaning assembly (26) includes two bidirectional lead screws (261) rotatably connected to the inside of the air duct (22) via bearings. Two cleaning brushes (262) are threaded onto the two bidirectional lead screws (261). The brush surfaces of the cleaning brushes (262) are in contact with the outer surface of the filter screen (25). The front of the mounting plate (23) has two strip-shaped through slots (263) for making way for the cleaning brushes (262). The inside of the air duct (22) is provided with a drive mechanism (264) for driving the two bidirectional lead screws (261) to rotate synchronously.

3. The direct-drive permanent magnet synchronous motor for a mud pump according to claim 2, characterized in that: The inside of the strip-shaped through groove (263) is fixed with four telescopic covers (265). The other end of the telescopic cover (265) is fixedly connected to the corresponding cleaning brush (262). Two telescopic covers (266) are fixed between two cleaning brushes (262).

4. A direct-drive permanent magnet synchronous motor for a mud pump according to claim 2, characterized in that: The drive mechanism (264) includes two connecting plates (2641) fixed inside the air duct (22). The side walls of the connecting plates (2641) are rotatably connected to the rotating shafts (2642) via bearings. The surfaces of the rotating shafts (2642) are fixed with driving bevel gears (2643). The surfaces of the bidirectional lead screws (261) are fixed with driven bevel gears (2644). The driven bevel gears (2644) are respectively meshed with the corresponding driving bevel gears (2643). A dual-axis motor (2645) is fixed inside the air duct (22). One end of each of the two rotating shafts (2642) is fixedly connected to the output end of the dual-axis motor (2645).

5. A direct-drive permanent magnet synchronous motor for a mud pump according to claim 1, characterized in that: Two sets of snap-fit ​​components (27) are installed on the frame (24) to fix it to the mounting plate (23). The snap-fit ​​components (27) include three guide rods (271) fixed on the frame (24). The surfaces of the three guide rods (271) are slidably fitted with a snap plate (272) that is compatible with the mounting plate (23). The snap plate (272) is snapped and fixed to the mounting plate (23). Three springs (273) are fixed on one side wall of the snap plate (272). The other end of each spring (273) is fixedly connected to the frame (24). Two telescopic covers (274) are fixed on the snap plate (272). The other end of each telescopic cover (274) is fixedly connected to the frame (24).

6. A direct-drive permanent magnet synchronous motor for a mud pump according to claim 1, characterized in that: A protective frame (28) is fixed to one side wall of the air duct (22), and protective inclined plates (29) are fixed at equal intervals inside the protective frame (28).

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