Oil pumping apparatus without a speed reducer

• US 10,458,214 B2
• Filed: 08/27/2018
• Issued: 10/29/2019
• Est. Priority Date: 02/02/2018
• Status: Active Grant

• Current Assignee: Dawei Wang, Yanan Liu
• Original Assignee: Dawei Wang, Yanan Liu
• Inventors: Liu, Yanan, Wang, Dawei
• Primary Examiner(s): Dinh, Thai T
• Application Number:
  US16/114,017
• Publication Number:
  US 20190242223A1
• Time in Patent Office: 428 Days
• CPC Class Codes: E21B 43/126 Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive powered by fluid E21B43/129
• CPC Class Codes: F04B 47/022 driving of the walking beam
• CPC Class Codes: G05B 19/05 Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts

Abstract

There is provided an oil pumping apparatus including: (1) a connector connected to a device; (2) a top platform; (3) a roller disposed on a top platform; (4) a motor disposed on the top platform; (5) a driven belt to enable synchronous drives to operate the roller; (6) a load belt moveable over the roller, one end of the load belt being connected to the connector, and the other end of the load belt being connected to a balance box to balance the weight of the device; and (7) a control system for the apparatus. When the motor rotates in a clockwise direction, the motor drives the roller rotate in the clockwise direction and the device moves down vertically; and when the motor rotates in an anticlockwise direction, the motor drives the roller rotate in the anticlockwise direction and the device moves up vertically.

Claims

1. An oil pumping apparatus comprising:

a connector connected to a device;

a top platform supported on a frame for operation and maintenance of the oil pumping apparatus;

a roller disposed on the top platform and having a first axle, the roller being rotatable about the first axle and being connected to a first wheel coaxially, wherein the first wheel has a first diameter;

a motor disposed on the top platform and having a second axle, the motor being rotatable about the second axle and having a second wheel, wherein the second wheel has a second diameter, and the first diameter of the first wheel is at least five times of the second diameter of the second wheel;

a driven belt covering the first wheel and the second wheel and being a heavy-duty timing belt to enable synchronous drives to operate the roller, wherein the roller is driven by the motor through the driven belt and the first wheel;

a load belt moveable over the roller, one end of the load belt having one end connected to the connector, and the other end of the load belting being connected to a balance box to balance the weight of the device; and

a control system for the apparatus,

wherein when the motor rotates in a clockwise direction, the motor drives the roller rotate in the clockwise direction through the driven belt and the device moves down vertically; and

wherein when the motor rotates in an anticlockwise direction, the motor drives the roller rotate in the anticlockwise direction and the device moves up vertically.

2. The oil pumping apparatus of claim 1, where the motor is one selected from the group consisting of an asynchronous motor, a direct current motor, a switched reluctance motor, and a permanent magnet synchronous motor.

3. The oil pumping apparatus of claim 1, where the motor has a torque capacity not lower than 700 N.m and a power not lower than 14 kilowatts.

4. The oil pumping apparatus of claim 1, wherein the driven belt comprises a hybrid tension member made of a glass carbon compound that enables drive solutions and is usable in drives subject to heavy-duty tensile loads, acceleration forces and shock loads.

5. The oil pumping apparatus of claim 1, further comprising an intermediate shaft disposed between the motor and the roller, wherein the immediate shaft has a first end connected to a third wheel and a second end connected to a fourth wheel, the third wheel is connected to the second wheel through a second driven belt and the fourth wheel is connected to the first wheel through a third driven belt, the second wheel of the motor drives the third wheel through the second driven belt and the fourth wheel through the immediate shaft simultaneously, and the fourth wheel drives the first wheel through the third driven belt.

6. The oil pumping apparatus of claim 5, wherein the third wheel has a third diameter and the fourth wheel has a fourth diameter, and each of the third diameter and the fourth diameter is larger than the second diameter and smaller than the first diameter.

7. The oil pumping apparatus of claim 1, wherein the load belt and balance box are moveable vertically.

8. The oil pumping apparatus of claim 1, further comprising an unloading mechanism, wherein

the uploading mechanism comprises an unloading wire rope;

one end of the unloading wire rope is fixed with the roller; and

the other end of the unloading wire rope goes through two movable pulleys of the balance box and connects to the top platform, and wherein to unload the device from the connector, the roller collects the uploading wire rope to pull up the balance box vertically.

9. The oil pumping apparatus of claim 8, further comprising a loss-of-load protection mechanism comprising:

a speed limiter mounted on the top platform;

a fixed pulley mounted on the bottom of the frame;

a loss-of-load protection wire rope bypassing both the speed limiter and the fixed pulley;

a connecting rod assembly mounted on the top of the balance box;

two guide rails welded to the frame; and

two clamp assemblies each installed on one side of the balance box and each having wedge clamping pieces distributed on sides of the two guide rails,

wherein one end of the loss-of-load protection wire rope is connected to the connecting rod assembly and the other end of the loss-of-load protection wire rope is connected to the balance box; and

wherein when the weight of the device is disconnected from the oil pumping apparatus, the speed limiter holds the loss-of-load protection wire rope, and the loss-of-load protection wire rope grabs the connecting rod assembly to trigger that the wedge clamping pieces clamp one of the two guide rails and two clamp assemblies clamp the guide rails to prevent the balance box from falling.

10. The oil pumping apparatus of claim 9, further comprising guide wheels, wherein the two guide rails guide the movement of the balance box vertically through the guide wheels and each of the two guide rails is disposed between two guide wheels of the guide wheels.

11. The oil pumping apparatus of claim 1, further comprising:

an encoder mounted on the motor,

wherein the encoder sends a signal to a programmable logic controller to record the rotation of the motor.

12. The oil pumping apparatus of claim 1, further comprising

a reference soft iron and a reference position switch, the reference soft iron being installed inside the load belt,

wherein when the reference soft iron is in a closest position to the reference position switch, the reference position switch sets the closest position as a reference position and sends a signal to a programmable logic controller.

13. The oil pumping apparatus of claim 1, further comprising an automatic mode and a manual operation mode.

14. The oil pumping apparatus of claim 1, the control system further comprises:

a programmable logic controller (PLC);

a motor controller connected to both the PLC and the motor; and

a text display directly connected to the PLC providing a frequency of the motor, a rotation speed of the motor, and an upper and a lower thresholds of movement distances of the load belt to the PLC.

15. The oil pumping apparatus of claim 14, wherein the PLC controls the motor controller and provides power to a relay coil for brake and a normal open relay switch.

16. The oil pumping apparatus of claim 15, wherein the control system further comprises a power-off brake,

wherein the relay coil for brake and the normal open relay switch control the operation of the power-off brake, and

wherein the power-off brake can set the oil pumping apparatus to have either a braking or a non-braking status.

17. The oil pumping apparatus of claim 14, wherein the motor controller controls start, stop, rotation speeds, and rotation directions of the motor, and provides real-time status of the motor to the PLC.

18. The oil pumping apparatus of claim 17, wherein the motor controller determines the statuses of the motor on whether the motor is overloaded or has overcurrent and/or overvoltage.

19. The oil pumping apparatus of claim 17, wherein the friction coefficient between the load roller and the load belt is above 0.6 and the friction force between the load roller and the load belt is greater than load difference between the device and the balance box so that there is no slip between the load roller and the load belt.

20. The oil pumping apparatus of claim 14, further comprising,

a display panel, the display panel including an upwards start button, a downwards start button, and a stop button,

wherein the upwards start button moves the connector up, the downwards start button moves the connector down, and the stop button stops the oil pumping apparatus.