Compactly designed motor pump and method

Abstract

According to the compactly-designed motor pump and the method, the compact design of the permanent magnet synchronous motor and the gear pump is achieved. According to the compactly-designed motor pump, the motor shell and the gear pump shell are tightly combined; the gear pump is placed in the motor and arranged in the radial direction, the high radius of the motor is facilitated, the torque capacity of the motor is improved, and the pump with higher power density is allowed to be placed in the electromagnet; a special oil inlet and a special oil outlet are formed in the right side of the shell; the motor rotor and the gear pump share one shaft; radial fans are installed at the two ends of the rotor, and the overall heat dissipation capacity of the motor pump is improved. According to the invention, the permanent magnet synchronous motor and the gear pump are tightly combined, so that the objectives of optimization of compactness, power density ratio, energy efficiency and stability are achieved.

Description

Technical Field

[0001] The invention belongs to the field of motor technology and hydraulic technology, and in particular relates to a motor pump and a method with a compact design. Background Art

[0002] At present, the combination of motors and pumps has a very wide range of applications, and the power consumption of the system has also increased significantly, with obvious energy waste. Traditional motor pump sets generally rely on couplings to connect the two. This connection method will make the wheelbase very long, increase instability, increase the difficulty of matching, and shorten the service life of the motor and pump. The compact motor pump will eliminate the above shortcomings and is the main development direction of hydraulic power drive in the future.

[0003] With the improvement of permanent magnet material performance, permanent magnet synchronous motors are widely used in new energy vehicles, industry and other fields due to their advantages of high power density, high efficiency and high power factor. The stator winding of a permanent magnet synchronous motor surrounds the stator core. By controlling the frequency of the input current of the stator winding, the magnetic field rotation frequency can be controlled, and then the speed can be controlled.

[0004] At present, most of the motor-pump drive systems on the market use asynchronous motors to provide power, but asynchronous motors have many disadvantages, such as high power consumption, high temperature rise, and low efficiency. These disadvantages can be greatly improved by using permanent magnet synchronous motors. In permanent magnet synchronous motors, excitation is provided by permanent magnets, so the power factor is higher than that of asynchronous motors. Especially in multi-pole low-speed motors, it is more convenient and more suitable to use permanent magnet motors. Among motors of the same capacity, synchronous motors have significantly less copper consumption than asynchronous motors, and also have the advantages of low-speed operation and large output torque, etc., which are very obvious. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a motor pump and method with a compact design. The present invention is based on the compact design of a permanent magnet synchronous motor and a gear pump, and adopts a radially arranged structure to increase the rotor radius of the permanent magnet synchronous motor. The larger rotor radius can arrange more permanent magnets, thereby increasing the strength and uniformity of the magnetic field, improving the torque capacity of the motor, and enabling the motor to generate a larger output torque. The increase in the rotor radius increases the surface area of ​​the rotor, which is also beneficial to the heat dissipation of the permanent magnet synchronous motor. In view of the complex temperature rise problem inside the motor pump, the compact motor pump of the present invention is equipped with radial fans on both sides of the rotor, which cooperate with the openings processed on the outer shell, so that the heat dissipation of the permanent magnets and stator windings in the motor pump can be completed. The motor pump of the present invention has the advantages of low noise, high efficiency, and compact structure, and perfectly solves the internal heat dissipation problem of the motor pump.

[0006] To achieve the above object, the technical solution adopted by the present invention is: A motor pump with a compact design specifically comprises: a motor pump casing, a rotor core, a permanent magnet, a radial fan, a stator winding, a bearing, a gear, an oil inlet, an oil outlet, an end cover, a ventilation hole and a stator core; the gear is connected to the rotor core through the bearing; the stator core is installed inside the motor pump casing; the permanent magnet is fixed on the outside of the rotor core; the stator winding is wound on the stator core; an oil inlet and an oil outlet are provided on the right side of the motor pump casing, oil enters from the oil inlet, and is discharged from the oil outlet driven by the gear; the stator core is the stator core of a surface-mounted permanent magnet synchronous motor; the end cover is installed on the left side of the motor pump casing.

[0007] As a further improvement of the present invention, radial fans are installed on both sides of the rotor core to dissipate heat inside the motor pump.

[0008] As a further improvement of the present invention, the motor pump casing is provided with ventilation holes, thereby improving the heat dissipation capacity of the motor pump.

[0009] The operation method of the compact motor pump is that when the equipment is started, the permanent magnet synchronous motor directly drives the bearing to rotate, and the bearing drives the gear to rotate. On the non-meshing side of the gear, the volume between the teeth will gradually increase, forming a vacuum. Due to the existence of the vacuum, the liquid will be sucked into this increased volume between the teeth. As the gear continues to rotate, the originally sucked liquid is brought to the meshing side of the gear. On the meshing side, the volume between the teeth gradually decreases, causing the liquid to be squeezed. Finally, the liquid is pressed and discharged from the oil outlet. The motor pump of a compact design proposed by the present invention has the following advantages: The wheelbase length is shortened, the stability is higher and the coordination difficulty is reduced.

[0010] It adopts permanent magnet synchronous motor, which has high power density, high efficiency and high power factor.

[0011] The radial arrangement structure increases the rotor radius of the permanent magnet synchronous motor, improves the torque capacity of the motor, and enables the motor to generate a greater output torque.

[0012] Radial fans are installed on both sides of the rotor to solve the problem of internal heat dissipation of the motor pump.

[0013] The compact structure saves installation space and is more practical for scenes with limited space.

[0014] The motor pump with a small number of structures and compact design has higher reliability and durability, reducing failure rate and maintenance needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an axial section view of the overall structure of the present invention.

[0016] Figure 2 It is a transverse cross-sectional view of the overall structure of the present invention.

[0017] Figure 3 It is a schematic diagram of the structure of the permanent magnet synchronous motor inside the motor pump.

[0018] Figure 4 It is a schematic diagram of the structure of the gear pump inside the motor pump.

[0019] In the figure: 1. Motor pump casing; 2. Rotor core; 3. Permanent magnet; 4. Radial fan; 5. Stator winding; 6. Bearing; 7. Gear; 8. Oil inlet; 9. Oil outlet; 10. End cover; 11. Ventilation hole; 12. Stator core. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: like Figure 1-4 Shown: Shown is a motor pump with a compact design, including a motor pump casing 1, a rotor core 2, a permanent magnet 3, a radial fan 4, a stator winding 5, a bearing 6, a gear 7, an oil inlet 8, an oil outlet 9, an end cover 10, a ventilation hole 11, and a stator core 12.

[0021] The casing 1 is a cylindrical shell opened in two axial directions, supporting the entire motor pump; a gear pump is installed at the right end inside the casing, the gear pump is completely embedded in the motor pump casing, and the casing 1 is connected to the pump casing by screws; the oil inlet 8 and the oil outlet 9 are both on the right side of the motor pump; an end cover is installed on the left side of the casing, and an air inlet is opened on the end cover.

[0022] The gear shaft and the rotor of the permanent magnet synchronous motor adopt key transmission. The key connection can enhance the torque transmission capacity of the rotating shaft and ensure the reliability of torque transmission. The keyway is easy to process and the transmitted torque is stable and reliable.

[0023] The stator of the permanent magnet synchronous motor is installed inside the casing of the motor pump by means of interference fit.

[0024] A number of permanent magnets are mounted on the rotor core to increase the rotor torque and shorten the axial distance.

[0025] The rotor of the permanent magnet synchronous motor is fixed to the drive flange, which enhances compactness and reduces the number of parts.

[0026] When the equipment starts, the permanent magnet synchronous motor directly drives the bearing 6 to rotate, and the bearing 6 drives the gear to rotate. On the non-meshing side of the gear, the volume between the teeth will gradually increase, forming a certain vacuum. Due to the existence of the vacuum, the liquid will be sucked into this increased volume between the teeth. As the gear continues to rotate, the originally sucked liquid is brought to the meshing side of the gear. On the meshing side, the volume between the teeth gradually decreases, causing the liquid to be squeezed. Finally, the liquid is forced out from the oil outlet.

[0027] All components are sealed in the casing of the motor pump. The permanent magnet synchronous motor is cooled by a radial fan attached to the rotor, and ventilation holes are machined on the casing to achieve air exchange with the outside to complete the cooling of the permanent magnet synchronous motor.

[0028] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A motor pump with a compact design, comprising: A motor pump casing (1), a rotor core (2), a permanent magnet (3), a radial fan (4), a stator winding (5), a bearing (6), a gear (7), an oil inlet (8), an oil outlet (9), an end cover (10), a ventilation hole (11) and a stator core (12); the gear (7) is connected to the rotor core (2) through the bearing (6); the stator core (12) is installed inside the motor pump casing (1); the permanent magnet (3) is fixed on the outside of the rotor core (2); the stator winding (5) is wound on the stator core (12); an oil inlet (8) and an oil outlet (9) are provided on the right side of the motor pump casing (1); oil enters from the oil inlet (8) and is discharged from the oil outlet (9) under the drive of the gear (7); the stator core (2) is a stator core of a surface-mounted permanent magnet synchronous motor; and the end cover (10) is installed on the left side of the motor pump casing (1).

2. A motor pump of compact design according to claim 1, characterized in that: The rotor core (2) is provided with radial fans (4) on both sides.

3. A motor pump of compact design according to claim 1, characterized in that: The motor pump casing (1) is provided with a ventilation hole (11) on its upper surface.

4. A motor pump of compact design according to claim 1, characterized in that: The stator winding (5) is covered with an insulating sheath.

5. A motor pump of compact design according to claim 1, characterized in that: The bearing (6) is connected to the rotor core (2).

6. A method for operating a motor pump of compact design according to any one of claims 1 to 5, characterized in that: When the device is started, the permanent magnet synchronous motor directly drives the bearing (6) to rotate, and the bearing (6) drives the gear (7) to rotate. On the non-meshing side of the gear (7), the inter-tooth volume will gradually increase, forming a vacuum. Due to the existence of the vacuum, the liquid will be sucked into the increased inter-tooth volume. As the gear (7) continues to rotate, the originally sucked liquid is brought to the meshing side of the gear. On the meshing side, the inter-tooth volume gradually decreases, causing the liquid to be squeezed. Finally, the liquid is forced out from the oil outlet (9).

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