Broken line anti-reverse control structure for ground driving device of screw pump

Abstract

A broken line anti-reverse control structure for a ground driving device of a screw pump relates to the technical field of oil and gas exploitation and comprises a motor, a sucker rod, a mounting seat, a rotating sleeve, a wedge sleeve, an anchoring ring, a planetary gear train, a pawl and a locking gear, and the mounting seat is connected to the upper end face of the motor through a bolt; the rotating sleeve is mounted in a through hole in the center of the mounting base through a bearing, the wedge sleeve is located on the inner side of the rotating sleeve, the outer side of the anchoring ring is in sliding fit with the inner side of the mounting base, and gear teeth and ratchets are machined on the inner side of the anchoring ring; the planetary gear train is located on the inner side of the mounting base, one end of the pawl is hinged to the outer side of the outer gear ring, and ratchets are machined on the outer side of the other end; and the upper end of the second rotating shaft extends upwards to the outer side of the mounting seat and can be locked on the mounting seat. Due to the fact that the pawl is arranged, when the sucker rod rotates reversely, the pawl can stretch out and be anchored on the anchoring ring under the action of centrifugal force, the sucker rod is locked at the moment when the sucker rod rotates reversely, and damage caused by high-speed rotation of the sucker rod is avoided.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas extraction, and in particular to a screw pump ground drive device disconnection anti-reverse control structure, which is applicable to online monitoring and maintenance of metal pipelines in industries such as petroleum, chemical, and metallurgy. Background Technology

[0002] Screw pump oil production equipment is an important type of oilfield production equipment. Its structure includes a motor on the surface, a screw pump downhole, and a sucker rod for connecting the motor and the screw pump. The motor drives the screw pump downhole through the sucker rod, thereby pumping the liquid downhole to the surface.

[0003] In production practice, the torque of the motor is transmitted to the screw pump through a thousand-meter-long sucker rod, causing the sucker rod to be strongly twisted. In this situation, if the motor power supply is unexpectedly interrupted, the torque applied by the motor disappears. Under the action of elastic restoring force, the upper end of the sucker rod will strongly reverse. If this reversal is not controlled, the high-speed rotation may cause parts such as the flywheel at the wellhead to shatter and fly out, even causing injuries. Existing technologies often use electromagnetic anti-reversal technology for braking, that is, using the electromagnetic braking force generated when the sucker rod drives the motor to reverse to achieve reverse braking.

[0004] When the operating conditions of an oil well change, the original electromagnetic anti-reverse technology can no longer meet the requirements, and mechanical anti-reverse technology needs to be added.

[0005] Existing technologies disclose various mechanical reversal control devices, such as friction brake structures, hydraulic brake structures, and hydraulic coupling structures. These types of mechanical reversal control devices all require redesigning the structure of all components (including the motor) at the wellhead where the motor is located, making direct installation on the existing wellhead impossible. This results in high manufacturing costs per well and significant impact on production during installation, requiring improvement. Furthermore, the aforementioned mechanical anti-reversal structures either suffer from difficulties in releasing reversal torque or present installation challenges; these issues also need to be addressed. Utility Model Content

[0006] This utility model provides a screw pump ground drive device disconnection anti-reverse control structure. The purpose is to solve the problems of high manufacturing cost, large impact on production during installation, and difficulty in releasing reverse energy in the existing mechanical anti-reverse device by designing a new mechanical anti-reverse mechanism.

[0007] The technical problem solved by this utility model is achieved by the following technical solution: This utility model provides a screw pump ground drive device disconnection anti-reverse control structure, including a motor and a sucker rod, and further including:

[0008] Mounting base, the mounting base is connected to the upper end face of the motor by bolts, and a through hole is machined in the center of the mounting base;

[0009] Rotating sleeve, the rotating sleeve is installed in the through hole in the center of the mounting base through a bearing, and the sucker rod passes through the center of the rotating sleeve;

[0010] Wedge sleeve, the wedge sleeve is located inside the rotating sleeve, and wedge-shaped claws are evenly distributed along the circumference at the lower end of the wedge sleeve. The wedge sleeve is fixed on the rotating sleeve through fasteners;

[0011] Anchoring ring, the outer side of the anchoring ring is in sliding fit with the inner side of the mounting base, and gear teeth and ratchet teeth are machined on the inner side of the anchoring ring;

[0012] Planetary gear train, the planetary gear train is located inside the mounting base, and its structure includes a central gear, planetary gears and an outer gear ring. The central gear is connected to the outer side of the rotating sleeve, the planetary gears are connected to the inner side of the top of the mounting base through the first rotating shafts, the outer gear ring is arranged on the outer side of the planetary gears, and the planetary gears are simultaneously meshed with the central gear and the outer gear ring;

[0013] Ratchet pawl, one end of the ratchet pawl is hinged to the outer side of the outer gear ring, and ratchet teeth are machined on the outer side of the other end. A spring is arranged between the ratchet pawl and the outer gear ring;

[0014] Locking gear, the locking gear is connected to the inner side of the top of the mounting base through the second rotating shaft, the locking gear is fixedly connected to the second rotating shaft, the second rotating shaft and the mounting base can rotate relative to each other, and the locking gear is meshed with the gear teeth on the inner side of the anchoring ring; The upper end of the second rotating shaft extends upward to the outside of the mounting base and can be locked on the mounting base.

[0015] As a preferred solution, a one-way bearing is arranged between the central gear and the rotating sleeve.

[0016] As a preferred solution, a window is machined on the side surface of the mounting base.

[0017] As a preferred solution, the inner side of the anchoring ring is limited by an inner hole snap ring.

[0018] As a preferred solution, there are two locking gears in total, and the two locking gears are respectively installed on two second rotating shafts.

[0019] The beneficial effects of the present utility model are:

[0020] 1. A ratchet pawl is arranged in the present utility model. When the sucker rod rotates reversely, the ratchet pawl can extend out under the action of centrifugal force and be anchored on the anchoring ring (at this time, the anchoring ring is in a locked state), so as to lock the sucker rod instantly at the moment of reverse start-up and avoid the damage caused by its high-speed rotation.

[0021] 2. In this invention, a planetary gear mechanism is provided between the pawl and the rotating sleeve. Simultaneously, the anchoring ring meshes with the locking gear. This multi-stage reduction structure significantly reduces the reverse torque of the sucker rod, ultimately transmitting it to the locking gear and the second shaft. In the event of a reverse torque failure, the controllable rotation of the second shaft easily releases the reverse torque, thus ensuring safety during maintenance. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall installation structure of this utility model.

[0023] Figure 2 This is a schematic diagram of the anti-reverse mechanism.

[0024] In the diagram: 1. Motor; 2. Mounting base; 3. Sucker rod; 4. Window; 5. Anchor ring; 6. Pawl; 7. Locking gear; 8. Second shaft; 9. Planetary gear; 10. First shaft; 11. Wedge sleeve; 12. Wedge pawl; 13. Rotating sleeve; 14. Gear tooth; 15. Racket tooth; 16. Internal retaining ring; 17. External gear ring; 18. Central gear; 19. One-way bearing. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] like Figure 1 , 2 As shown, this embodiment includes a motor 1, a sucker rod 3, a mounting base 2, a rotating sleeve 13, a wedge sleeve 11, an anchoring ring 5, a planetary gear system, a pawl 6, and a locking gear 7.

[0027] like Figure 1 , 2 As shown, in this embodiment, the mounting base 2 is bolted to the upper surface of the motor 1. The bolts used here can be the original bolts on the upper cover of the motor 1 (if the bolt length is insufficient, longer bolts can be provided separately). This allows the mounting base 2 and its associated components to be directly installed in the motor 1 of the existing screw pump well without modifying the existing equipment, thus significantly reducing manufacturing and installation costs. A through hole is machined in the center of the mounting base 2.

[0028] The rotating sleeve 13 is mounted in the through hole in the center of the mounting base 2 via a bearing, and the sucker rod 3 passes through the center of the rotating sleeve 13.

[0029] like Figure 1 , 2As shown, in this embodiment, the wedge sleeve 11 is located on the inner side of the rotating sleeve 13. The lower end of the wedge sleeve 11 has wedge-shaped claws 12 evenly distributed along the circumference. After the wedge sleeve 11 is fastened to the upper side of the rotating sleeve 13 by fasteners, the wedge sleeve 11 can wedge into the space between the rotating sleeve 13 and the sucker rod 3 under the action of fastening force, thereby fixing the rotating sleeve 13 to the sucker rod 3. Then, the reverse rotation power of the sucker rod 3 is transmitted to the anti-reverse rotation mechanism through the rotating sleeve 13.

[0030] like Figure 1 , 2 As shown, in this embodiment, the outer side of the anchoring ring 5 slides into the inner side of the mounting base 2, allowing the anchoring ring 5 to rotate. The inner side of the anchoring ring 5 is machined with gear teeth 14 and ratchet teeth 15. Before and after a sucker rod 3 reversal accident, the anchoring ring 5 and the mounting base 2 are relatively fixed, ensuring that the sucker rod 3 is locked and preventing reversal. During post-accident maintenance, the anchoring ring 5 is rotated in a controllable manner to slowly release the reversal energy of the sucker rod 3.

[0031] like Figure 1 , 2 As shown, in this embodiment, the planetary gear train is located inside the mounting base 2. Its structure includes a central gear 18, planetary gears 9, and an external gear ring 17. The central gear 18 is connected to the outside of the rotating sleeve 13. The planetary gears 9 are connected to the inside of the top of the mounting base 2 through the first rotating shaft 10. The external gear ring 17 is located outside the planetary gears 9. The planetary gears 9 mesh with both the central gear 18 and the external gear ring 17.

[0032] like Figure 1 , 2 As shown, in this embodiment, the pawl 6 has one end hinged to the outside of the outer gear ring 17, and the other end has ratchet teeth 15 machined on its outer side. A spring is provided between the pawl 6 and the outer gear ring 17. During normal operation, the pawl 6 retracts under the action of the spring. When the sucker rod 3 rotates in the reverse direction, the sucker rod 3 drives the outer gear ring 17 to rotate through the planetary gear system. This causes the end of the pawl 6 with ratchet teeth 15 to swing outward under the action of centrifugal force, overcoming the elastic restraint of the spring. This allows the ratchet teeth 15 on the pawl 6 to lock onto the ratchet teeth 15 on the inner side of the anchoring ring 5, thereby locking the sucker rod 3 at the moment of reverse start-up to avoid damage caused by its high-speed rotation.

[0033] like Figure 1 , 2 As shown, in this embodiment, the locking gear 7 is connected to the inner side of the top of the mounting base 2 via the second rotating shaft 8. The locking gear 7 is fixedly connected to the second rotating shaft 8, and the second rotating shaft 8 and the mounting base 2 can rotate relative to each other. The locking gear 7 meshes with the gear teeth 14 on the inner side of the anchoring ring 5. The upper end of the second rotating shaft 8 extends upward to the outer side of the mounting base 2 and can be locked on the mounting base 2.

[0034] In this embodiment, a planetary gear 9 mechanism is provided between the pawl 6 and the rotating sleeve 13. At the same time, the anchoring ring 5 meshes with the locking gear 7. This multi-stage reduction structure significantly reduces the reversing torque of the sucker rod 3, which is ultimately transmitted to the locking gear 7 and the second rotating shaft 8. After a reversal accident occurs, the reversing torque can be easily released through the controllable rotation of the second rotating shaft 8, thereby ensuring safety during maintenance.

[0035] like Figure 1 , 2 As shown, in this embodiment, a one-way bearing 19 is provided between the central gear 18 and the rotating sleeve 13, so that the central gear 18 does not rotate when the sucker rod 3 and the rotating sleeve 13 rotate in the forward direction, thereby reducing unnecessary wear. When the sucker rod 3 and the rotating sleeve 13 rotate in the reverse direction, the one-way bearing 19 can make the central gear 18 and the rotating sleeve 13 rotate together, thereby realizing the transmission of power.

[0036] like Figure 1 , 2 As shown in this embodiment, the side of the mounting base 2 is machined with a window 4, which can reduce weight and facilitate observation, installation and maintenance.

[0037] like Figure 1 , 2 As shown, in this embodiment, the inner side of the anchoring ring 5 is limited by the inner hole retaining spring 16, which is simple and easy to implement.

[0038] like Figure 1 , 2 As shown, in this embodiment, there are two locking gears 7, which are respectively installed on two second rotating shafts 8. The two gears and the second rotating shafts 8 can achieve two-point control. By controlling the rotation speed of the two second rotating shafts 8 simultaneously or alternately, the safety of the reverse energy release process is greatly improved.

[0039] Working principle:

[0040] When the reverse rotation occurs, the reverse motion of the sucker rod 3 is transmitted sequentially to the rotating sleeve 13, the central gear 18, the planetary gear 9, and the external gear ring 17. The centrifugal force of the rotating external gear ring 17 causes the end of the pawl 6 with the ratchet 15 to swing outward under the action of the centrifugal force, thus causing the ratchet 15 on the pawl 6 to be locked on the ratchet 15 on the inner side of the anchoring ring 5. Then, at the moment of the reverse rotation start, the sucker rod 3 is locked. After locking, the rotation tendency of the anchoring ring 5 causes the rotational torque to continue to be transmitted to the locking gear 7 and the second rotating shaft 8.

[0041] During post-accident maintenance, the locking between the second shaft 8 and the mounting base 2 is released, and the second shaft 8 is manually controlled to rotate slowly. This gradually releases the reverse energy of the sucker rod 3. For example, a brake mechanism can be installed at the upper end of the second shaft 8 to lock it, and the rotational speed of the second shaft 8 can be controlled by controlling the clamping force. Of course, there are many ways to control the rotational speed of the second shaft 8; in practice, any existing technology can be selected.

Claims

1. A screw pump ground drive device disconnection anti-reverse control structure, comprising a motor (1) and a sucker rod (3), characterized in that, Also includes: Mounting base (2) is bolted to the upper end face of motor (1), and a through hole is machined in the center of mounting base (2); Rotary sleeve (13) is mounted in the through hole in the center of mounting base (2) by bearing, and the sucker rod (3) passes through the center of the rotating sleeve (13); The wedge sleeve (11) is located inside the rotating sleeve (13). The lower end of the wedge sleeve (11) has wedge-shaped claws (12) evenly distributed along the circumference. The wedge sleeve (11) is fixed to the rotating sleeve (13) by fasteners. Anchoring ring (5), the outer side of the anchoring ring (5) slides with the inner side of the mounting base (2), and the inner side of the anchoring ring (5) is machined with gear teeth (14) and ratchet teeth (15). The planetary gear train is located inside the mounting base (2). Its structure includes a central gear (18), planetary gears (9) and an external gear ring (17). The central gear (18) is connected to the outside of the rotating sleeve (13). The planetary gears (9) are connected to the inside of the top of the mounting base (2) through the first rotating shaft (10). The external gear ring (17) is located outside the planetary gears (9). The planetary gears (9) mesh with both the central gear (18) and the external gear ring (17). A pawl (6) is provided. One end of the pawl (6) is hinged to the outside of the outer gear ring (17), and the other end is machined with ratchet teeth (15). A spring is provided between the pawl (6) and the outer gear ring (17). The locking gear (7) is connected to the inner side of the top of the mounting base (2) via the second rotating shaft (8). The locking gear (7) is fixedly connected to the second rotating shaft (8). The second rotating shaft (8) and the mounting base (2) can rotate relative to each other. The locking gear (7) meshes with the gear teeth (14) on the inner side of the anchoring ring (5). The upper end of the second rotating shaft (8) extends upward to the outer side of the mounting base (2) and can be locked on the mounting base (2).

2. The anti-reverse rotation control structure for a screw pump ground drive device according to claim 1, characterized in that: A one-way bearing (19) is provided between the central gear (18) and the rotating sleeve (13).

3. The anti-reverse rotation control structure for a screw pump ground drive device according to claim 1, characterized in that: The mounting base (2) has a window (4) machined on its side.

4. The anti-reverse rotation control structure for a screw pump ground drive device according to claim 1, characterized in that: The inner side of the anchoring ring (5) is limited by the inner hole retaining ring (16).

5. The anti-reverse rotation control structure for a screw pump ground drive device according to claim 1, characterized in that: There are two locking gears (7), which are respectively mounted on two second rotating shafts (8).

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