Stand column pumping unit

Abstract

The utility model discloses a stand column oil pumping unit which comprises an oil well pump and further comprises an electric cylinder unit arranged over the oil well pump, the extendable section of a plunger rod of the oil well pump is plugged in the electric cylinder unit, and the plunger rod is connected with the telescopic end of an electric cylinder. The plunger rod of the oil well pump is plugged in the electric cylinder unit, the plunger rod can move up and down through stretching and retracting of the electric cylinder, the plunger rod does not need to be pulled outside through a rigging any more, the plunger rod is not exposed outside any more, and work risks are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of oil pumping machine technology, and in particular relates to a column-mounted oil pumping machine. Background Technology

[0002] According to their structure, oil pumping units can be mainly divided into beam pumping units and beamless pumping units. Among them, beamless pumping units mainly consist of two types: chain pumping units and steel rope pumping units.

[0003] Chain pumping unit converts rotary motion into reciprocating motion through a crank-slider mechanism to achieve oil extraction;

[0004] Steel rope oil pumps achieve oil extraction by rotating the drum in both directions.

[0005] Existing chain pumping units and steel rope pumping units expose the rigging (steel rope or chain) to the outside, posing a safety risk if the rigging breaks during operation. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a column-mounted oil pumping unit that addresses the shortcomings of the prior art by sealing the plunger rod of the oil pump inside the electric cylinder unit and using the extension and retraction of the electric cylinder to realize the up and down movement of the plunger rod. This eliminates the need for rigging to pull the plunger rod from the outside and the plunger rod is no longer exposed, thus reducing the risk of operation.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a column-mounted oil pump, including an oil pump and an electric cylinder unit disposed directly above the oil pump. The extendable section of the plunger rod of the oil pump is sealed inside the electric cylinder unit, and the plunger rod and the telescopic end of the electric cylinder are connected.

[0008] The aforementioned column-mounted oil pump unit includes a plugging seat and an electric cylinder. The electric cylinder is installed above the plugging seat, and a plugging channel is vertically opened on the plugging seat. The telescopic end of the electric cylinder extends into the plugging channel from top to bottom, and the plunger rod of the oil pump extends into the plugging channel from bottom to top and is connected to the telescopic end of the electric cylinder.

[0009] In the aforementioned column-mounted pumping unit, a sealing plug is detachably installed at the lower port of the sealing channel, and the sealing plug has a through hole in the middle for the plunger rod to pass through.

[0010] The aforementioned column-mounted oil pumping unit includes an electric cylinder comprising a lead screw, a nut, a base, a guide seat, and a drive motor. The nut is sleeved on the lead screw, and a limiting device is installed at the middle mounting hole of the base, wherein the limiting device is for both upper and lower positioning. The guide seat is installed above the base, and a limiting guide channel is formed in the middle of the guide seat. The upper end of the lead screw is limited and installed within the limiting guide channel, wherein the limiting device at the upper end of the lead screw is for rotational positioning. The drive motor is mounted on the base or the guide seat, and the drive motor is connected to the nut via a transmission connection.

[0011] In the aforementioned column-mounted pumping unit, a rectangular guide block is installed at the upper end of the lead screw, and the segment of the limiting guide channel located above the nut is a rectangular channel adapted to the rectangular guide block.

[0012] In the aforementioned column-mounted oil pumping unit, an optical coupler baffle is installed at the upper end of the lead screw, a sealing plate is installed at the upper opening of the limiting guide channel, and a detection optical coupler is installed on the sealing plate at the position inside the limiting guide channel. The optical coupler baffle and the detection optical coupler are used in conjunction.

[0013] In the aforementioned column-mounted pumping unit, the lower end of the nut has a shoulder structure, and the lower end opening of the limiting guide channel is a stepped hole adapted to the shoulder structure. A thrust bearing is installed in the stepped hole to support the shoulder structure.

[0014] Compared with existing technologies, this invention has the following advantages: By directly placing the electric cylinder unit above the oil pump and connecting it to the plunger rod, a compact structure and efficient drive are achieved for the oil pumping unit. The linear motion characteristics of the electric cylinder can precisely control the stroke and speed of the plunger rod, improving oil pumping efficiency. Simultaneously, compared with traditional hydraulic or pneumatic systems, the servo motor drive of the electric cylinder has higher energy conversion efficiency and energy saving, reducing the risk of oil leakage.

[0015] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structural principle of this utility model.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1—Plunger rod; 2—Plug seat; 3—Plug channel;

[0019] 4—Sealing plug; 5—Lead screw; 6—Nut;

[0020] 7—Base; 8—Guide seat; 9—Drive motor;

[0021] 10—Guide channel; 11—Gear pair; 12—Heat dissipation hole;

[0022] 13—Rectangular guide block; 14—Optical coupler baffle; 15—Sealing plate;

[0023] 16—Detection optocoupler; 17—Thrust bearing; 18—Plug. Detailed Implementation

[0024] like Figure 1 As shown, a column-mounted oil pump includes an oil pump and an electric cylinder unit disposed directly above the oil pump. The extendable section of the plunger rod 1 of the oil pump is sealed inside the electric cylinder unit, and the plunger rod 1 is connected to the telescopic end of the electric cylinder.

[0025] In this embodiment, the electric cylinder unit includes a sealing seat 2 and an electric cylinder. The electric cylinder is installed above the sealing seat 2. A sealing channel 3 is vertically opened on the sealing seat 2. The telescopic end of the electric cylinder extends into the sealing channel 3 from top to bottom. The plunger rod 1 of the oil pump extends into the sealing channel 3 from bottom to top and is connected to the telescopic end of the electric cylinder.

[0026] It should be noted that the integrated design of the sealing seat 2 and the electric cylinder optimizes the sealing performance. The sealing channel 3 confines the linkage between the electric cylinder's telescopic end and the plunger rod 1 within a sealed space, effectively preventing crude oil leakage. Furthermore, the vertical layout reduces the lateral space occupied by the mechanical structure, facilitating installation and maintenance in confined wellhead environments, and preventing the plunger rod 1 from being exposed, thus avoiding potential hazards in case of breakage. Those skilled in the art should understand that the plunger rod 1 here can also be a rigging, such as a chain or steel rope.

[0027] In this embodiment, a sealing plug 4 is detachably installed at the lower port of the sealing channel 3, and the sealing plug 4 has a through hole in the middle for the plunger rod 1 to pass through.

[0028] It should be noted that the removable sealing plug 4 simplifies the maintenance process of the plunger rod 1. The through-hole allows the plunger rod 1 to move freely while also enabling quick repair of sealing failures by replacing the sealing plug 4, reducing downtime. This modular design is particularly suitable for high-temperature or high-abrasion environments, improving equipment durability.

[0029] In this embodiment, the electric cylinder includes a lead screw 5, a nut 6, a base 7, a guide seat 8, and a drive motor 9. The nut 6 is sleeved on the lead screw 5 and is limited at the middle mounting hole of the base 7. The limitation of the nut 6 is both upper and lower. The guide seat 8 is installed above the base 7 and has a limiting guide channel 10 in the middle. The upper end of the lead screw 5 is limited within the limiting guide channel 10 and is limited by rotation. The drive motor 9 is installed on the base 7 or the guide seat 8 and is connected to the nut 6 in a transmission manner.

[0030] It should be noted that the lead screw-nut transmission mechanism, combined with a servo motor drive, achieves high-precision linear motion, suitable for dynamic adjustment needs arising from changes in oil well depth. The design of the guide seat 8 and the limit guide channel 10 enhances the stability of the lead screw 5's movement, preventing deviation or vibration and improving the reliability of the oil pumping process.

[0031] Preferably, there are two drive motors 9, which are symmetrically arranged. The drive motors 9 and the nut 6 are connected by a gear pair 11. In use, one drive motor 9 can be on standby and the other can be the main motor, or one motor can be responsible for driving the lead screw 5 to move downward and the other can be responsible for driving the lead screw 5 to move upward.

[0032] In this embodiment, the drive motor 9 is mounted on the guide seat 8, and the base 7 is provided with heat dissipation holes 12 for heat dissipation of the motor.

[0033] In this embodiment, a rectangular guide block 13 is installed at the upper end of the lead screw 5, and the segment of the limiting guide channel 10 located above the nut 6 is a rectangular channel adapted to the rectangular guide block 13.

[0034] It should be noted that the cooperation between the rectangular guide block 13 and the rectangular channel completely restricts the rotational freedom of the lead screw 5, ensuring pure linear motion and reducing energy loss and component wear caused by rotational friction. This rigid guide structure is particularly suitable for heavy-load, long-stroke scenarios, extending the service life of the lead screw 5 and the nut 6.

[0035] In this embodiment, an optical coupler baffle 14 is installed on the upper end of the lead screw 5, a sealing plate 15 is installed on the upper opening of the limiting guide channel 10, and a detection optical coupler 16 is installed on the sealing plate 15 at the position inside the limiting guide channel 10. The optical coupler baffle 14 and the detection optical coupler 16 are used together.

[0036] It should be noted that the cooperation between the optocoupler baffle 14 and the detection optocoupler 16 achieves closed-loop control of the stroke, which can monitor the position of the lead screw 5 in real time and feed back to the control system to prevent overshoot or understroke. The sealing design of the sealing plate 15 further protects the internal sensors and adapts to harsh downhole environments (such as high humidity and oil contamination).

[0037] In this embodiment, the lower end of the nut 6 has a shoulder structure, and the lower end opening of the limiting guide channel 10 is a stepped hole adapted to the shoulder structure. A thrust bearing 17 is installed in the stepped hole to support the shoulder structure.

[0038] It should be noted that the support of the thrust bearing 17 to the shoulder of the nut 6 significantly reduces axial frictional resistance during transmission and improves transmission efficiency. The combined design of the stepped bore and bearing disperses load pressure, avoids component deformation or damage caused by local stress concentration, and enhances the overall stability of the system.

[0039] When this utility model is in use, the drive motor 9 starts and drives the nut 6 to rotate alternately in the forward and reverse directions through the gear pair 11. Under the action of the rotation of the nut 6, the lead screw 5 moves up and down in a straight line, thereby driving the plunger rod 1 to move up and down. The plunger rod 1 drives the plunger 18 to move up and down in the oil pipe. Under the action of pressure difference, the crude oil underground is extracted and flows out from the output pipe of the oil pipe.

[0040] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A column-mounted oil pumping unit, comprising an oil pump, characterized in that, It also includes an electric cylinder unit located directly above the oil pump, wherein the extendable section of the plunger rod of the oil pump is sealed inside the electric cylinder unit, and the plunger rod is connected to the telescopic end of the electric cylinder.

2. A column-mounted oil pumping unit according to claim 1, characterized in that, The electric cylinder unit includes a sealing seat and an electric cylinder. The electric cylinder is installed above the sealing seat. A sealing channel is vertically opened on the sealing seat. The telescopic end of the electric cylinder extends into the sealing channel from top to bottom. The plunger rod of the oil pump extends into the sealing channel from bottom to top and is connected to the telescopic end of the electric cylinder.

3. A column-mounted oil pumping unit according to claim 2, characterized in that, A sealing plug is detachably installed at the lower port of the sealing channel, and the sealing plug has a through hole in the middle for the plunger rod to pass through.

4. A column-mounted oil pumping unit according to claim 2, characterized in that, The electric cylinder includes a lead screw, a nut, a base, a guide seat, and a drive motor. The nut is sleeved on the lead screw, and the nut is limited at the middle mounting hole of the base, with the nut providing both upper and lower limit. The guide seat is mounted above the base, and a limit guide channel is formed in the middle of the guide seat. The upper end of the lead screw is limited within the limit guide channel, with the upper end of the lead screw providing a rotational limit. The drive motor is mounted on the base or the guide seat, and the drive motor is connected to the nut via a transmission connection.

5. A column-mounted oil pumping unit according to claim 4, characterized in that, A rectangular guide block is installed at the upper end of the lead screw, and the segment of the limiting guide channel above the nut is a rectangular channel that is adapted to the rectangular guide block.

6. A column-mounted pumping unit according to claim 4 or 5, characterized in that, An optical coupler baffle is installed at the upper end of the lead screw, and a sealing plate is installed at the upper opening of the limiting guide channel. A detection optical coupler is installed on the sealing plate at the position inside the limiting guide channel. The optical coupler baffle and the detection optical coupler are used together.

7. A column-mounted oil pumping unit according to claim 4 or 5, characterized in that, The lower end of the nut has a shoulder structure, and the lower end opening of the limiting guide channel is a stepped hole adapted to the shoulder structure. A thrust bearing is installed in the stepped hole to support the shoulder structure.

Images