A double horse head pumping unit and a single horse head pumping unit

Abstract

The utility model relates to a pumping unit, concretely relates to a pumping unit that horsehead fan leaf articulates on the frame through swing drives the pumping rod connected on the horsehead fan leaf to realize pumping through reciprocating movement, the pumping unit in through setting linear drive arrangement of horizontal direction work drives the horsehead fan leaf swing to complete pumping, is different from the driving mode of the crank connecting rod mechanism in the existing pumping unit, need not set up complex reduction mechanism and crank connecting rod mechanism, makes the simple structure, and linear drive power output directly acts on the horsehead, improves transmission efficiency.

Description

Technical Field

[0001] This utility model relates to engineering machinery, and more particularly to mechanical equipment for extracting oil from wells. Background Technology

[0002] Oil pumping units operate by using a donkey head to drive the sucker rods up and down in a reciprocating motion. A common type is the beam pumping unit, also known as a nodding donkey pump, which uses the swinging of the beam to move the donkey head up and down to pump oil. These units typically only operate on a single well and require a large footprint. To improve efficiency, as illustrated in utility model patent CN211258573U, a dual-donkey head system is used to simultaneously pump oil from two wells. This means two donkey heads control two sucker rods to perform the pumping operation.

[0003] Whether it's a beam pumping unit or a twin-head pumping unit, the mechanism that drives the head to swing is usually a crank-connecting rod mechanism, which requires a motor and a reduction gear to achieve the drive. Its structure is complex and its transmission efficiency is low. Utility Model Content

[0004] To address the problems of complex structure and low transmission efficiency associated with traditional oil pumping units using crank-connecting rod mechanisms, the technical solution adopted in this invention is as follows:

[0005] A double-donkey-head oil pumping unit includes a frame, on which a pair of donkey-head fan blades are mounted, each capable of swinging and driving the connected sucker rods to reciprocate to perform oil pumping operations. A linear drive device is mounted on the frame, capable of performing horizontal work and simultaneously driving the donkey-head fan blades to swing.

[0006] The linear drive device has two synchronous output terminals, each of which is connected to the respective donkey head fan blades via a flexible component.

[0007] A movable pulley system is provided between the two output ends of the linear drive device and each donkey head fan blade.

[0008] The two donkey-head fan blades are connected to each other by a flexible member, and the output end of the linear drive device is connected to the flexible member to drive the flexible member to make the donkey-head fan blades swing.

[0009] A single-donkey-head oil pumping unit includes a frame, on which a donkey-head fan blade is mounted that can swing and drive the connected sucker rod to reciprocate to perform oil pumping operations. A linear drive device is mounted on the frame that can perform horizontal work to drive the donkey-head fan blade to swing.

[0010] A movable pulley system is provided between the donkey-head fan blades and the linear drive device.

[0011] The frame is equipped with a counterweight that works in conjunction with the donkey-head fan blades to balance their oscillation.

[0012] By adopting the above technical solution, the donkey head is directly driven to swing through the linear drive device, eliminating the need for complex reduction mechanisms and crank-connecting rod mechanisms. The structure is simple, and the linear drive power output acts directly on the donkey head, improving transmission efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of Example 1 of the double-donkey-head oil pumping unit;

[0014] Figure 2 This is a schematic diagram of Example 2 of a double-headed oil pumping unit;

[0015] Figure 3 This is a schematic diagram of Example 3 of a double-headed oil pumping unit;

[0016] Figure 4 This is a schematic diagram of the structure of Example 1 of a single-donkey-head oil pumping unit;

[0017] Figure 5 This is a schematic diagram of the structure of Example 2 of a single-donkey-head oil pumping unit;

[0018] Figure 6 This is a schematic diagram of the structure of Example 3 of a single-donkey-head oil pumping unit;

[0019] Figure 7 This is a schematic diagram of the structure of Example 4 of a single-donkey-head oil pumping unit. Detailed Implementation

[0020] To better understand the concept of this invention, the following explanation is provided with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1 to 3 The double-donkey-head oil pumping unit shown includes a frame 1, on which a pair of donkey-head fan blades are mounted. These donkey-head fan blades are hinged to the frame 1 and can swing around the hinge point under the action of external force. A suspension rope 2 is mounted on each donkey-head fan blade through a flexible component. The suspension rope 2 can be connected to the sucker rod, so that when each donkey-head fan blade swings, it can drive the sucker rod to move up and down reciprocally to achieve the oil pumping operation.

[0022] The device that drives the blades of each donkey head fan to swing is a linear drive device. The linear drive device outputs a force in the horizontal direction, which can drive the two donkey head fan blades to swing synchronously. The swinging mode is that one donkey head fan blade swings upward and the other donkey head fan blade swings downward.

[0023] Figure 1The drive unit can be a linear drive unit with two synchronous output ends, such as a two-way hydraulic cylinder (i.e., both ends of the hydraulic rod extend out of the hydraulic cylinder, and when one side of the hydraulic rod extends out of the hydraulic cylinder, the other side retracts into the hydraulic cylinder), a ball screw pair (the nut is placed in the middle of the screw, and when the nut drives the screw to move, one end of the screw moves away from the nut and the other end moves closer to the nut), an electric cylinder (similar to the structure of the ball screw pair mentioned above), a linear motor, etc.

[0024] This example uses a ball screw assembly. To simplify the explanation of the connection relationship, we will use... Figure 1 The left-hand fan blade is designated as the first fan blade 3a, and the right-hand fan blade is designated as the second fan blade 3b. The left end of the lead screw 5 is designated as the first output end 6a, and the right end of the lead screw is designated as the second output end 6b. The connection between the ball screw pair, which serves as the linear drive device, and the two fan blades is as follows: the first output end 6a is connected to the first fan blade 3a via a flexible member 8a, and the second output end 6b is connected to the second fan blade 3b via a flexible member 8b. When the nut 7 in the ball screw assembly is driven to rotate by the motor, the screw 5 moves horizontally along the axial direction. For example, when the screw 5 moves to the left, the second output end 6b drives the second donkey head blade 3b to swing upward through the flexible element 8b. At this time, the sucker rod is lifted, while at the same time, under the action of gravity, the first donkey head blade 3a swings downward under its own weight and the weight of the sucker rod connected to it, causing the left sucker rod to fall. When the motor rotates in the reverse direction, the swing direction of the first donkey head blade 3a and the second donkey head blade 3b changes. In this way, the reciprocating movement of the screw 5 in the horizontal direction is achieved by the forward and reverse rotation of the motor, thereby causing the first donkey head blade 3a and the second donkey head blade 3b to swing up and down, realizing the oil extraction operation of the sucker rods on both sides. The connection method of other linear drive devices such as bidirectional hydraulic cylinders and linear motors is similar to the connection method of the ball screw assembly described above, and will not be described in detail here.

[0025] To facilitate the selection of linear drive devices, such as Figure 2 The drive unit in the double-head pumping unit shown can be a linear drive device with only one output end, such as a conventional hydraulic cylinder, electric cylinder, or linear motor. Taking a hydraulic cylinder as an example, the first and second head blades 3a and 3b are connected together by a flexible member 8. The output end of the hydraulic cylinder 9 is fixedly connected to the flexible member 8, and the output end of the hydraulic cylinder 9 is kept to move horizontally. The straight section of the flexible member 8 remains horizontal. Figure 2 As shown, when the output end of the hydraulic cylinder 9 moves to the left, the flexible member 8 pulls the second donkey-head fan blade 3b to swing upward, while the first donkey-head fan blade 3a swings downward under the action of gravity, and vice versa. When the hydraulic cylinder 9 reciprocates, the above-described action is achieved. Figure 1 The movement of the sucker rod causes it to move back and forth to perform the oil extraction operation.

[0026] In the above embodiments, the two donkey-head fan blades have a balancing effect when oscillating, thereby reducing the load on the linear drive device. To further reduce the load on the linear drive device, a movable pulley system can be added between the output end and the donkey-head fan blades based on Embodiment 1. Figure 3 Taking the partial schematic diagram of a double-head pumping unit using a ball screw pair as an example, the second donkey-head fan blade 3b is connected to the movable pulley 10 via a first flexible member 8c. A second flexible member 8d is wound around the movable pulley 10. One end of the second flexible member 8d is fixed to the frame 1 as a dead end, and the other end is connected to the second output end 6b of the screw 5. When the second output end 6b moves to the left, the movable pulley 10 is moved by the second flexible member 8d. Under the action of the movable pulley 10, the second donkey-head fan blade 3b is pulled upward by the first flexible member 8c. The other side of the movable pulley system in this embodiment is set up in the same way as this side, and will not be described again here. This movable pulley system further reduces the driving load of the linear drive device, thereby enabling the donkey-head fan blade to swing with a smaller linear drive device, reducing costs. Regarding the setting of the movable pulley system, this embodiment only provides one example. Those skilled in the art are capable of further optimizing the movable pulley system based on the conventional setting of the movable pulley system, which should belong to the same technical features.

[0027] The above are several embodiments of a double-head pumping unit. This linear drive method can also be applied to a single-head pumping unit. The following explanation is based on the accompanying drawings and embodiments.

[0028] like Figure 4 The single-head pumping unit shown includes a frame 1, on which a donkey-head fan blade 3 is mounted. The donkey-head fan blade 3 is hinged to the frame 1 and can swing around the hinge point under external force. A suspension rope 2 is connected to the donkey-head fan blade 3 for connecting the sucker rod. When the donkey-head fan blade 3 swings, it drives the sucker rod to reciprocate up and down, thus achieving the pumping operation. To drive the donkey-head fan blade 3 to swing, a linear drive device is provided on the frame 1. The linear drive device can be a hydraulic cylinder, an electric cylinder, a linear motor, etc. Figure 4 Taking the hydraulic cylinder as an example, the hydraulic cylinder 9 is set horizontally, and its output end is connected to the donkey head fan blade 3 through the flexible part 8. When the output end moves to the right, it drives the donkey head fan blade 3 to swing upward. When the output end moves to the left, the donkey head fan blade 3 swings downward under the action of gravity. Thus, when the output end of the hydraulic cylinder 9 moves back and forth, the donkey head fan blade 3 can swing back and forth, thereby driving the sucker rod to move up and down to realize the oil pumping operation.

[0029] To reduce the load on the linear drive unit, such as Figure 5As shown, a movable pulley system can be set between the linear drive device and the donkey-head fan blade 3. That is, the donkey-head fan blade 3 is connected to the movable pulley 10 through the first flexible member 8c. A second flexible member 8d is wound around the movable pulley 10. One end of the second flexible member 8d is fixed to the frame 1 as a dead end, and the other end is connected to the output end of the hydraulic cylinder 9. When the output end of the hydraulic cylinder moves to the right, the second flexible member 8d pulls the movable pulley 10 to move. The movable pulley 10 drives the donkey-head fan blade 3 to swing upward through the flexible member 8. When the output end of the hydraulic cylinder moves to the left, the donkey-head fan blade swings downward under the action of gravity and at the same time pulls the movable pulley 10 to the left through the first flexible member 8c.

[0030] Or perhaps to reduce the load on the drive unit, such as Figure 6 and Figure 7 The diagram shows a counterweight 11 configured to balance the weight of the donkey-head fan blade 3 and the sucker rod, reducing the load on the linear drive unit. A brief explanation of the two counterweight 11 configurations is provided below. Figure 6 The counterweight is similar to one of the donkey head blades in a double-donkey head pumping unit. The counterweight 11 is hinged to the frame 1 and can swing, except that the counterweight 11 does not need to be connected to a sucker rod for pumping operations. Therefore, in this embodiment, the arrangement of the linear drive device can also refer to the arrangement of the linear drive device in a double-donkey head pumping unit. Figure 7 A counterweight 11 is set as a counterweight 11 through a fixed pulley 16 and a flexible component 8 to balance the donkey head fan blade 3. Figure 7 The linear drive device in the illustrated embodiment can also be configured with reference to the connection method between the linear drive mechanism and the double donkey heads in a double donkey head pumping unit.

[0031] In the above embodiments, steel wire rope is the optimal flexible component. Furthermore, the straight section of the flexible component connecting the donkey-head fan blades should ideally always remain horizontal, ensuring that the straight section of the flexible component is tangent to the edge of the donkey-head fan blades when the donkey-head fan blades swing.

Claims

1. A double-donkey-head oil pumping unit, comprising a frame, wherein a pair of donkey-head fan blades are mounted on the frame, each capable of swinging and driving its connected sucker rod to reciprocate to perform oil pumping operations, characterized in that: A linear drive device is provided on the frame, which can perform horizontal work and drive the oscillation of each of the donkey-head fan blades.

2. The double-donkey-head oil pumping unit according to claim 1, characterized in that: The linear drive device has two synchronous output terminals, each of which is connected to the respective donkey head fan blades via a flexible component.

3. A double-donkey-head oil pumping unit according to claim 2, characterized in that: A movable pulley system is provided between the two output ends of the linear drive device and each donkey head fan blade.

4. The double-donkey-head oil pumping unit according to claim 1, characterized in that: The two donkey-head fan blades are connected to each other by a flexible member, and the output end of the linear drive device is connected to the flexible member to drive the flexible member to make the donkey-head fan blades swing.

5. A single-donkey-head oil pumping unit, comprising a frame, wherein a donkey-head fan blade is mounted on the frame and is capable of swinging to drive a sucker rod connected thereto to reciprocate in order to perform oil pumping operations, characterized in that: A linear drive device capable of horizontally driving the donkey-head fan blades to swing is provided on the frame.

6. A single-donkey-head oil pumping unit according to claim 5, characterized in that: A movable pulley system is provided between the donkey-head fan blades and the linear drive device.

7. A single-donkey-head oil pumping unit according to claim 5 or 6, characterized in that: The frame is equipped with a counterweight that works in conjunction with the donkey-head fan blades to balance their oscillation.

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