Outer rotor motor direct drive pump set

Abstract

The utility model belongs to the technical field of pump class drive, and relates to a direct drive pump set of outer rotor motor, outer rotor DC motor, it includes stator casing, the stator casing is fixed with stator and coil in, the stator cover is equipped with the flywheel of mass concentration in the outer ring, the flywheel is fixed with the magnetic ring in and forms the outer rotor structure of motor, the stator casing is rotationally arranged with the main shaft of bearing support, the main shaft is fixedly connected with the flywheel, high pressure pump, it includes the pump body and the plunger of setting in the pump body, the main shaft of outer rotor DC motor stretches into the pump body of high pressure pump, and the main shaft end is connected with the plunger through eccentric shaft, when the outer rotor DC motor starts, the main shaft drives the reciprocating motion of plunger to transport fluid. The direct drive pump set of outer rotor motor provided by the utility model has the advantages of high pressure, high efficiency, energy saving, low noise, low vibration and environmental protection safety.

Description

Technical Field

[0001] This utility model belongs to the technical field of pump drives, and relates to an external rotor motor direct drive pump set. Background Technology

[0002] Existing sprayers, cleaning machines, and garden epidemic prevention equipment generally use general-purpose gasoline engines as their power source, which has problems such as high noise, high vibration, exhaust pollution, strict oil management, and obvious safety hazards.

[0003] Chinese utility model patent CN108462308A (publication date: 2018-08-28) discloses an electric direct-drive plunger pump, including a crankcase and a pump body. Bearing seats are provided on both sides of the crankcase, and the crankshaft mates with the bearing seats at both ends. The pump is characterized by: a direct-drive external rotor motor being provided on the outer side of the bearing seats; the direct-drive external rotor motor including an end cover and an annular stator core housed within the end cover; several mounting holes are provided on the outer side of the bearing seats; a positioning through hole corresponding to the mounting holes is provided on the annular stator core; the stator core is fixed to the outer side of the bearing seats and coaxially arranged with the bearings on the bearing seats; the end cover includes an axial portion and a radial portion; a magnet is provided on the inner wall of the axial portion; and a connecting sleeve that mates with the crankshaft end is provided at the center of the inner side of the radial portion.

[0004] The aforementioned electric direct-drive plunger pump uses an end cap connected to the crankshaft and is driven by a crankshaft connecting rod structure. This structure is difficult to overcome the periodic torque pulsation caused by the reciprocating motion of the plunger, resulting in continued vibration and noise problems. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing an external rotor motor direct-drive pump set, which has the advantages of high pressure, high efficiency, energy saving, low noise, low vibration, and environmental safety.

[0006] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution: An external rotor motor direct-drive pump set includes: An external rotor DC motor includes a stator housing, in which a stator and coils are fixed. A flywheel with mass concentrated on the outer ring is provided on the stator housing. A magnetic ring is fixed inside the flywheel to form the external rotor structure of the motor. A main shaft supported by bearings is rotatably arranged inside the stator housing and is fixedly connected to the flywheel. A high-pressure pump, comprising a pump body and a plunger disposed within the pump body; The main shaft of the external rotor DC motor extends into the pump body of the high-pressure pump. The end of the main shaft is connected to the plunger through an eccentric shaft. When the external rotor DC motor is started, the main shaft drives the plunger to reciprocate to transport fluid.

[0007] In the aforementioned external rotor motor direct drive pump assembly, the stator housing, main shaft, and pump body are coaxially arranged, and the stator housing and pump body are connected as one unit by fasteners.

[0008] In the aforementioned external rotor motor direct drive pump assembly, the stator housing and flywheel are distributed front and rear and clearance-fitted. The flywheel has several through holes arranged radially to further concentrate the flywheel mass to the outer ring; the through holes also form the motor's heat dissipation structure.

[0009] In the aforementioned external rotor motor direct drive pump assembly, the end of the main shaft is fixedly connected to the eccentric shaft, and a drive bearing is sleeved on the eccentric shaft. The inner ring of the drive bearing is interference-fitted with the eccentric shaft, and the outer ring is clearance-fitted with the drive groove of the plunger.

[0010] In the aforementioned external rotor motor direct drive pump assembly, a water seal and an oil seal are sequentially arranged on the plunger along its axial direction, and an isolation chamber is formed between the water seal and the oil seal. The water seal, the isolation chamber, and the oil seal constitute a series sealing structure. Furthermore, the series sealing structure is arranged at both ends of the plunger to isolate the pump chamber and the lubrication chamber.

[0011] In the aforementioned external rotor motor direct drive pump assembly, a left pressure chamber and a right pressure chamber are arranged in opposite directions within the pump body, and the plunger alternately compresses the fluid in the left pressure chamber and the right pressure chamber during reciprocating motion.

[0012] In the aforementioned type of external rotor motor direct drive pump set, the pump set is configured in a sprayer, cleaning machine, disinfection equipment, insecticidal equipment, or garden maintenance equipment.

[0013] Compared with the prior art, this utility model has the following advantages: 1. This utility model provides an external rotor motor direct drive pump set. The motor adopts a flywheel with mass distributed on the outer ring as a large outer diameter rotor structure. The flywheel torque assistance can effectively absorb and release the periodic torque fluctuations generated by the reciprocating motion of the plunger, smoothing the output torque from the power source, thus improving the noise and vibration of the whole machine. The flywheel torque assistance effect also ensures that the motor can still run smoothly under load fluctuations. Combined with the direct drive from the main shaft to the plunger, the energy loss of mechanical transmission is minimized, achieving efficient power transmission, stable operation and energy saving.

[0014] 2. This utility model also has a more compact structure: the motor stator housing and pump body are arranged in an integrated design, and intermediate transmission mechanisms such as reducers and couplings are eliminated, realizing a high degree of integration of the power unit, significantly reducing the axial dimension, greatly reducing the volume and weight, and effectively reducing the operating burden of operators.

[0015] 3. The pump set provided by this utility model has excellent characteristics such as compact structure, low noise, and zero emissions, making it particularly suitable for integration into various portable or environmentally friendly equipment, such as sprayers, cleaning machines, disinfection machines, and garden maintenance equipment, with a wide range of applications. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention; Figure 2 This is a cross-sectional view of the present invention. Figure 1 ; Figure 3 This is a cross-sectional view of the present invention. Figure 2 ; Reference numerals: 1. External rotor DC motor; 11. Stator housing; 12. Stator; 13. Coil; 14. Flywheel; 15. Magnetic ring; 16. Main shaft; 17. Eccentric shaft; 18. Through hole; 19. Drive bearing; 2. High-pressure pump; 21. Pump body; 22. Plunger; 23. Water seal; 24. Oil seal; 25. Isolation chamber; 26. Left pressure chamber; 27. Right pressure chamber. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 : An external rotor motor direct-drive pump set includes: An external rotor DC motor 1 includes a stator housing 11, a stator 12 and a coil 13 fixed inside the stator housing 11, a flywheel 14 with mass distributed on the outer ring of the stator 12, a magnetic ring 15 fixed inside the flywheel 14 to form the external rotor structure of the motor, and a main shaft 16 supported by a bearing rotatably disposed inside the stator housing 11, the main shaft 16 being fixedly connected to the flywheel 14; The high-pressure pump 2 includes a pump body 21 and a plunger 22 disposed within the pump body 21; the pump body 21 is provided with a left pressure chamber 26 and a right pressure chamber 27 that are relatively distributed, and the plunger 22 alternately compresses the fluid in the left pressure chamber 26 and the right pressure chamber 27 when it reciprocates; the pump body 21 is also provided with conventional structures such as an inlet chamber, an outlet chamber, a check valve, a guide pipe, and an oil sight glass; The main shaft 16 of the external rotor DC motor 1 extends into the pump body 21 of the high-pressure pump 2. The end of the main shaft 16 is connected to the plunger 22 through the eccentric shaft 17. When the external rotor DC motor 1 is started, the main shaft 16 drives the plunger 22 to reciprocate to transport fluid.

[0018] In this embodiment, a flywheel 14 is used as the outer rotor. The flywheel 14 adopts a cover structure, including a radial part and an outer peripheral part. Combined with the magnetic ring 15 fixed on the inner wall of the outer peripheral part, its mass is concentrated on the outer ring, which plays a role in inertial torque assistance during operation. Of course, other methods such as material differences, shape distribution, or counterweights can also be used to distribute the mass of the flywheel on the outer ring. After the motor is powered on, the flywheel 14 drives the main shaft 16 to rotate, which is then converted into the reciprocating motion of the plunger 22 through the eccentric shaft 17. The reciprocating motion of the plunger 22 causes the volume of the left and right pressure chambers 27 to change alternately. With the action of the one-way valve, fluid is drawn in from the inlet and continuously output at high pressure from the outlet chamber. During this process, the inertial effect of the flywheel 14 can smooth the fluctuation of the driving torque and ensure smooth operation.

[0019] Preferably, the stator housing 11, the main shaft 16 and the pump body 21 are coaxially arranged, and the stator housing 11 and the pump body 21 are connected as one unit by fasteners. Through the integrated structure, all intermediate transmission components can be eliminated, the axial dimension is greatly reduced, and miniaturization and weight reduction are achieved.

[0020] Preferably, the stator housing 11 and the flywheel 14 are distributed front to back and have a clearance fit. The flywheel 14 is provided with a plurality of through holes 18 along the radial direction. The structure of the through holes 18 can reduce the mass of the radial part of the flywheel 14 and make the mass of the flywheel 14 further concentrated on the outer ring. The through holes 18 also form a heat dissipation structure for the motor to enhance air convection and improve the heat dissipation capacity of the motor.

[0021] To ensure efficient and reliable power transmission, the end of the main shaft 16 is fixedly connected to the eccentric shaft 17. A drive bearing 19 is sleeved on the eccentric shaft 17. The inner ring of the drive bearing 19 is interference-fitted with the eccentric shaft 17, and the outer ring is clearance-fitted with the drive groove of the plunger 22.

[0022] A water seal 23 and an oil seal 24 are sequentially arranged along the axial direction of the plunger 22. An isolation cavity 25 is formed between the water seal 23 and the oil seal 24. The water seal 23, the isolation cavity 25 and the oil seal 24 constitute a series sealing structure. Furthermore, the series sealing structure is arranged at both ends of the plunger 22 to isolate the pump cavity and the lubrication cavity. Through the series sealing structure, the working medium on the pump side and the lubricating oil on the motor side can be effectively prevented from mixing.

[0023] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A direct-drive pump set with an external rotor motor, characterized in that, include: An external rotor DC motor (1) includes a stator housing (11), a stator (12) and a coil (13) are fixed inside the stator housing (11), a flywheel (14) with mass concentrated on the outer ring is provided on the stator (12), a magnetic ring (15) is fixed inside the flywheel (14) and forms the external rotor structure of the motor, and a main shaft (16) supported by a bearing is rotatably provided inside the stator housing (11), and the main shaft (16) is fixedly connected to the flywheel (14); The high-pressure pump (2) includes a pump body (21) and a plunger (22) disposed in the pump body (21). The main shaft (16) of the external rotor DC motor (1) extends into the pump body (21) of the high-pressure pump (2). The end of the main shaft (16) is connected to the plunger (22) through the eccentric shaft (17). When the external rotor DC motor (1) is started, the main shaft (16) drives the plunger (22) to reciprocate to transport fluid.

2. The external rotor motor direct-drive pump set according to claim 1, characterized in that, The stator housing (11), main shaft (16) and pump body (21) are coaxially arranged, and the stator housing (11) and pump body (21) are connected as one unit by fasteners.

3. The external rotor motor direct-drive pump set according to claim 1, characterized in that, The stator housing (11) and the flywheel (14) are distributed in front and behind and are fitted with a clearance. The flywheel (14) has several through holes (18) arranged radially.

4. The external rotor motor direct-drive pump set according to claim 1, characterized in that, The end of the main shaft (16) is fixedly connected to the eccentric shaft (17), and a drive bearing (19) is sleeved on the eccentric shaft (17). The inner ring of the drive bearing (19) is interference-fitted with the eccentric shaft (17), and the outer ring is clearance-fitted with the drive groove of the plunger (22).

5. The external rotor motor direct-drive pump set according to claim 1, characterized in that, A water seal (23) and an oil seal (24) are sequentially arranged on the plunger (22) along its axial direction. An isolation cavity (25) is formed between the water seal (23) and the oil seal (24). The water seal (23), the isolation cavity (25) and the oil seal (24) constitute a series sealing structure.

6. The external rotor motor direct-drive pump set according to claim 1, characterized in that, The pump body (21) is provided with a left pressure chamber (26) and a right pressure chamber (27) that are relatively distributed. When the plunger (22) reciprocates, it alternately compresses the fluid in the left pressure chamber (26) and the right pressure chamber (27).

7. The external rotor motor direct-drive pump set according to claim 1, characterized in that, The pump unit is configured in sprayers, cleaning machines, disinfection equipment, insecticidal equipment, or garden maintenance equipment.

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