Pumping unit reduction gearbox and semi-direct-drive motor mixed oil cooling device

Abstract

The invention relates to a cooling device for mixed oil of a reduction gearbox and a semi-direct-drive motor of an oil pumping unit. The semi-direct-drive permanent magnet motor mainly solves the problems that an existing semi-direct-drive permanent magnet motor cannot be cooled, the temperature is too high, and electromagnetic coil aging and magnetic steel demagnetization are caused. The motor is characterized in that an oil collecting tank (5) is arranged below the reduction gearbox input shaft (8), a flow guide pipe (4) is arranged between the oil collecting tank (5) and the motor shell (1), the bottom of the motor shell (1) is connected with a gear pump chamber (3) communicated with the motor shell (1), an oil return port (10) is arranged between the gear pump chamber (3) and the box body (2), and a gear pump (12) is arranged in the gear pump chamber (3). According to the mixed oil cooling device for the reduction gearbox of the oil pumping unit and the semi-direct-drive motor, cooling of the permanent magnet motor is achieved through lubricating oil of the reduction gearbox of the oil pumping unit, the heat dissipation problem is solved, cost is saved, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of semi-direct-drive permanent magnet motors in the oil industry, and specifically to a hybrid oil cooling device for a pumping unit speed reducer and a semi-direct-drive motor. Background Art

[0002] At present, the high-power semi-direct-drive permanent magnet motors supporting pumping units have the characteristics of low speed and high-power operation. Due to space limitations, the internal space of the motor is extremely compact. At the same time, the large torque output results in a high thermal load, causing the internal temperature of the motor to be extremely high. The permanent magnet used in the rotor of the semi-direct-drive permanent magnet motor is magnetized and has no cooling ability itself. In actual applications, the high thermal energy generated during the operation of the motor cannot be conducted out. The direct consequence is the aging of the electromagnetic coil insulation layer and the demagnetization of the magnetic steel, which greatly reduces the output torque of the motor or even burns out the coil. This problem greatly restricts the improvement of the use efficiency of high-power semi-direct-drive permanent magnet motors and shortens the service life of the motor. Summary of the Invention

[0003] In order to overcome the deficiency that the existing semi-direct-drive permanent magnet motor cannot be cooled, resulting in overheating, electromagnetic coil aging, and magnetic steel demagnetization, the present invention provides a hybrid oil cooling device for a pumping unit speed reducer and a semi-direct-drive motor. The hybrid oil cooling device for a pumping unit speed reducer and a semi-direct-drive motor uses the lubricating oil of the pumping unit speed reducer to cool the permanent magnet motor, which not only solves the heat dissipation problem, but also saves costs and extends the service life of the motor.

[0004] The technical solution of the present invention is: a hybrid oil cooling device for a pumping unit speed reducer and a semi-direct-drive motor, including a box body and a motor housing. A speed reducer input shaft is provided in the box body. An oil collecting tank is provided below the speed reducer input shaft. A diversion pipe is provided between the oil collecting tank and the motor housing. The bottom of the motor housing is connected to a gear pump chamber communicated therewith. An oil return port is opened between the gear pump chamber and the box body. A gear pump is provided in the gear pump chamber.

[0005] An oil inlet is opened on the motor housing at the connection with the diversion pipe.

[0006] A shaft gear is connected to the speed reducer input shaft, and the oil collecting tank is located at the bottom of the shaft gear.

[0007] The oil collecting tank is a long strip-shaped groove, and baffles are provided at both ends of the groove, and the positions of the baffles at both ends are outside the shaft gears at both ends.

[0008] The opening of the diversion pipe is located at the lowest point of the oil collecting tank.

[0009] A motor shaft is connected to the speed reducer input shaft, a rotor frame is fixed on the motor shaft, and rotor magnets are provided on the rotor frame.

[0010] A stator coil is provided inside the motor housing, and the stator coil corresponds to the rotor magnet.

[0011] A liquid level sensor is provided on the inner wall of the motor housing.

[0012] The motor shaft drives the input shaft of the reduction gearbox and the first-stage gear to rotate. The first-stage gear drives other transmission shafts to operate with reduced speed, causing the lubricating oil at the bottom of the reduction gearbox to splash. The oil collecting tank collects the splashed lubricating oil in the tank and transports the lubricating oil into the motor housing through a diversion pipe. After the lubricating oil enters the motor, it is driven by the rotor to splash and then flows to the bottom of the motor housing. When the lubricating oil at the bottom reaches a certain height, the gear pump starts and outputs the lubricating oil from the oil return port to the inside of the reduction gearbox housing, completing the cooling process of the semi-direct drive motor.

[0013] The present invention has the following beneficial effects: By adopting the above-mentioned solution, an oil collecting tank is provided in the reduction gearbox, and a gear pump is provided on the motor, so that the lubricating oil in the reduction gearbox is circulated to the semi-direct drive motor, realizing the oil cooling and heat dissipation of the semi-direct drive motor. This not only solves the heat dissipation problem but also greatly reduces the cost. During this working process, the lubricating oil contacts the magnet and the coil to absorb heat, reducing the temperature of both, improving the insulation degree of the coil, avoiding the occurrence of magnet demagnetization and coil burnout accidents, and at the same time effectively lubricating the bearings of the semi-direct drive motor, greatly improving the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a half-sectional view of the left view of the present invention; Figure 2 is a half view of the right view of the present invention; Figure 3 is a half-sectional view of the middle structure of the pumping unit reduction gearbox and the semi-direct drive motor; Figure 4 is a half-sectional view of the bottom structure of the pumping unit reduction gearbox and the semi-direct drive motor.

[0015] In the figure, 1 - motor housing, 2 - housing, 3 - gear pump chamber, 4 - diversion pipe, 5 - oil collecting tank, 6 - stator coil, 7 - motor shaft, 8 - input shaft of the reduction gearbox, 9 - first-stage gear, 10 - oil return port, 11 - oil inlet, 12 - gear pump, 13 - rotor magnet. EMBODIMENTS

[0016] The present invention will be further described below with reference to the accompanying drawings: By Figures 1 to 4As shown in the figure, a hybrid oil cooling device for a pumping unit reduction gearbox and a semi-direct drive motor includes a reduction gearbox housing 2 and a motor housing 1. A reduction gearbox input shaft 8 is provided inside the housing 2. A shaft gear 9 is connected to the reduction gearbox input shaft 8. The end of the reduction gearbox input shaft 8 is connected to a motor shaft 7. A rotor frame is fixed on the motor shaft 7, and rotor magnets 13 are provided on the rotor frame. A stator coil 6 is provided inside the motor housing 1, and the stator coil 6 corresponds to the rotor magnets 13.

[0017] A sump 5 is provided below the reduction gearbox input shaft 8. The sump 5 is located at the bottom of the shaft gear 9, and its actual installation position can be adjusted according to the splash oil flow direction and angle of the shaft gear 9. The sump 5 is a long groove. Baffles are provided at both ends of the groove, and the positions of the two end baffles are outside the two end shaft gears 9, ensuring that as much oil flow splashed by the shaft gear 9 as possible is received by the sump 5 when the gears rotate. A diversion pipe 4 is provided between the sump 5 and the motor housing 1. The opening of the diversion pipe 4 is located at the lowest point of the sump 5, and an oil inlet 11 is opened on the motor housing 1 at the connection with the diversion pipe 4, so that the oil in the sump 5 can enter the motor housing 1 along the diversion pipe 4. At the position of the housing 2 corresponding to the diversion pipe 4 and the oil inlet 11 on the motor housing 1, sealing should be ensured to prevent external dust and debris from entering the housing or the motor housing.

[0018] The bottom of the motor housing 1 is connected to a gear pump chamber 3. The gear pump chamber 3 communicates with the top motor housing 1. An oil return port 10 is opened between the gear pump chamber 3 and the housing 2, and a gear pump 12 is provided inside the gear pump chamber 3. The motor power configuration of the gear pump 12 is related to the heat generation of the semi-direct drive motor. If the power of the semi-direct drive motor is large, the motor of the gear pump 12 will increase simultaneously to increase the lubricating oil circulation volume.

[0019] The working principle of the present invention is as follows: The semi-direct drive motor shaft 7 drives the reduction gearbox input shaft 8 and the shaft gear 9 to rotate. The shaft gear 9 continues to drive the subsequent transmission shafts to reduce the speed and operate, and the formed cycle causes the lubricating oil at the bottom of the reduction gearbox to splash, constituting splash lubrication. The sump 5 provided at the lower position of the input shaft 8 and the shaft gear 9 collects the splashed lubricating oil in the sump, and then sends the lubricating oil to the inside of the semi-direct drive motor through the diversion pipe 4 and the oil inlet 11; after the lubricating oil enters the motor, it is contaminated by the rotor and splashes centrifugally, filling the inside of the motor with lubricating oil. Affected by gravity, the lubricating oil will collect along the gap areas such as the stator coil towards the bottom of the motor. When the lubricating oil at the bottom reaches a certain height, the gear pump 12 starts to operate through periodic timing control, outputs the lubricating oil to the inside of the reduction gearbox, realizes the circulation of the lubricating oil, completes the cooling process of the semi-direct drive motor, and avoids the damage of the magnets and coils.

[0020] Furthermore, a liquid level sensor can be provided on the side wall at the gap between the rotor and the stator inside the motor housing 1. After the lubricating oil enters the motor and the retention amount at the bottom reaches this height, the lubricating oil is automatically controlled to flow back to the reduction gearbox.

[0021] When there is a liquid level difference between the speed reducer and the semi-direct drive motor, and the bottom of the semi-direct drive motor is higher than the actual liquid level of the lubricating oil in the speed reducer, it is not necessary to configure the gear pump 17, and it can operate by natural circulation. For high-power semi-direct drive motors with high heat generation, a gear pump 12 can be set at the upper part or side of the speed reducer to directly extract the lubricating oil from the speed reducer and spray it inside the semi-direct drive motor. A return pipe is set at the bottom of the semi-direct drive motor, and the circulating lubricating oil returns to the inside of the speed reducer from here.

Claims

1. A hybrid oil cooling device for a pumping unit reduction gearbox and a semi-direct drive motor, comprising a box body (2) and a motor housing (1). A reduction gearbox input shaft (8) is provided in the box body (2). It is characterized in that: Below the input shaft (8) of the speed reducer, there is an oil sump (5). A diversion pipe (4) is provided between the oil sump (5) and the motor housing (1). The bottom of the motor housing (1) is connected to a gear pump chamber (3) that is in communication with it. An oil return port (10) is opened between the gear pump chamber (3) and the housing (2). A gear pump (12) is provided in the gear pump chamber (3).

2. The oil cooling device for the pumping unit speed reducer and semi-direct drive motor according to claim 1, characterized in that: An oil inlet (11) is opened at the connection of the motor housing (1) and the diversion pipe (4).

3. The oil cooling device for the pumping unit speed reducer and semi-direct drive motor according to claim 2, characterized in that: A shaft gear (9) is connected to the input shaft (8) of the speed reducer. The oil sump (5) is located at the bottom of the shaft gear (9).

4. The oil cooling device for the pumping unit speed reducer and semi-direct drive motor according to claim 3, wherein: The oil sump (5) is a long strip-shaped groove. Baffles are provided at both ends of the groove, and the positions of the baffles at both ends are outside the shaft gears (9) at both ends.

5. The oil cooling device for a pumping unit speed reducer and a semi-direct drive motor according to claim 4, characterized in that: The opening of the diversion pipe (4) is located at the lowest point of the oil sump (5).

6. The oil cooling device for the pumping unit speed reducer and semi-direct drive motor according to claim 5, characterized in that: A motor shaft (7) is connected to the input shaft (8) of the speed reducer. A rotor frame is fixed on the motor shaft (7), and rotor magnets (13) are provided on the rotor frame.

7. The oil cooling device for a pumping unit speed reducer and a semi-direct drive motor according to claim 6, characterized in that: A stator coil (6) is provided in the motor housing (1), and the stator coil (6) corresponds to the rotor magnets (13).

8. The oil cooling device for the pumping unit speed reducer and semi-direct drive motor according to claim 7, characterized in that: A liquid level sensor is provided on the inner wall of the motor housing (1).

9. The oil cooling device for a pumping unit speed reducer and a semi-direct drive motor according to claim 8, characterized in that: The motor shaft (7) drives the input shaft (8) of the speed reducer and the shaft gear (9) to rotate. The shaft gear (9) drives other transmission shafts to operate at a reduced speed, causing the lubricating oil at the bottom of the speed reducer to splash. The oil sump (5) collects the splashed lubricating oil in the tank and transports the lubricating oil into the motor housing (1) through the diversion pipe (4). After the lubricating oil enters the motor, it is splashed by the rotor and flows to the bottom of the motor housing (1). When the lubricating oil at the bottom reaches a certain height, the gear pump (12) starts and outputs the lubricating oil from the oil return port (10) to the inside of the speed reducer housing (2), completing the cooling process of the semi-direct drive motor.

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