CN106917609B - Screw pump ground direct-drive oil production device with anti-reverse function - Google Patents

Abstract

The invention belongs to the field of screw pump oil production equipment, and particularly relates to a screw pump ground direct-drive oil production device with an anti-reversion function, which comprises a motor, a square clamp and a polished rod, wherein the motor is erected above a blowout preventer, a hollow output shaft of the motor is directly connected with the upper end of the polished rod so as to drive the polished rod to rotate, a motor mounting frame is arranged above the blowout preventer, the motor is fixedly installed at the top of the motor mounting frame, the blowout preventer is connected to the bottom of the motor mounting frame through a flange, and the motor mounting frame comprises an upper plate, a lower plate and a bearing seat. The upper end of the polished rod is penetrated by a lower plate and a hole in the center of the bearing seat, the square clamp for clamping the polished rod is fixedly arranged at the upper end part of the polished rod, the output shaft of the motor is connected to the top of the square clamp through a staggered concave-convex matching structure, so that the effect of the coupler is realized, and a thrust bearing is arranged between the bearing seat and the square clamp. The possibility that the polished rod is contacted with a person after a reversal accident is eliminated, and the accident of hurting the person is thoroughly avoided.

Description

A ground direct drive oil production device with screw pump with anti-reverse function

technical field

The utility model belongs to the field of screw pump oil production equipment, in particular to a screw pump ground direct drive oil production device with anti-reverse function.

Background technique

At present, in the technical field of oil exploitation, the screw pump direct drive device is a widely used oil pumping device. In this device, the upper end of the polished rod needs to pass through the hollow shaft of the motor to be led to the upper side of the motor. In this case, once the polished rod reverses due to a fault, the exposed upper end of the polished rod will be bent under the action of centrifugal force. The rotation of the polished rod after bending will cause direct injury to the maintenance workers, causing casualties, and there is a great potential safety hazard. Therefore, it is necessary to brake the polished rod when it reverses.

In the existing technology, researchers have long been committed to solving the problem of wounding people caused by the reverse rotation of polished rods by developing reliable anti-reverse braking technology. At present, the commonly used anti-reverse braking technologies include electromagnetic braking and mechanical braking. . Electromagnetic braking is a current that is output by the controller to the motor winding in the direction of the magnetic field to weaken the reverse speed of the motor, so as to achieve the effect of limiting the reverse. In the case of power failure, the brake will fail. Mechanical brakes are braked through frictional brake elements. Once the brake mechanism fails, the brake will fail. It can be seen that both braking methods are difficult to guarantee the absolute effectiveness of braking.

Contents of the invention

The utility model provides a screw pump surface direct drive oil production device with anti-reversal function. In the device, the upper end of the polished rod is not exposed. Even if the brake fails, the polished rod will only rotate inside the device. At the same time, the polished rod When reversing, it will not drive other mechanisms exposed to the outside of the device to move, so it will not cause injury to maintenance personnel.

The technical problems solved by the utility model are realized by the following technical solutions: the utility model provides a screw pump surface direct-drive oil production device with anti-reversal function, including a motor, a square card and a polished rod, and the motor is erected on the top of the sealing device. Above, the hollow output shaft of the motor is directly connected to the upper end of the polished rod, thereby driving the polished rod to rotate. A motor mounting frame is arranged above the well sealing device, and the motor is fixedly installed on the top of the motor mounting frame. The sealing device is connected to the The bottom of the motor mount;

The motor mounting frame includes an upper plate, a lower plate and a bearing seat. The motor is fixedly installed on the upper side of the upper plate, the output shaft of the motor faces downward, and the lower plate and the bearing seat are fixedly connected to the well sealing device through the same set of bolts side, the bearing seat is located on the upper side of the lower plate, a rotary seal is arranged between the polished rod and the bearing seat, at least three sets of sliding sleeves and sliding rods are arranged between the upper plate and the bearing seat, through the cooperation of the sliding sleeve and the sliding rod, the The upper plate can slide stably in the vertical direction under the drive of external force, wherein the sliding sleeve is fixed on the upper side of the bearing seat, the sliding rod is fixed on the lower side of the upper plate, and there is a device between the upper plate and the lower plate that can be moved after use. The manual jack that can be removed after use can lift the upper plate together with the motor on it by operating the manual jack that can be removed after use;

The upper end of the polished rod passes through the hole in the center of the lower plate and the bearing seat, the square clamp used to clamp the polished rod is fixedly installed on the upper end of the polished rod, and the output shaft of the motor is connected to the square clamp through a staggered concave and convex matching structure The top, so as to realize the function of the coupling, and a thrust bearing is arranged between the bearing seat and the square card.

Preferably, the sliding fit between the sliding sleeve and the sliding rod can be locked and fixed by locking bolts.

Preferably, a protective cover is installed on the lower side of the upper plate, and the axial dimension of the protective cover is equal to the length of the sliding sleeve.

The beneficial effects of the utility model are: in the prior art, scientific researchers have long been committed to solving the problem of wounding people by the reverse rotation of the polished rod by developing reliable anti-reverse braking technology, but the utility model abandons this idea. The utility model creatively improves the structure of the existing screw pump direct drive device, by restricting the position of the upper end of the polished rod, and setting the structure such as the square card and the thrust bearing on the lower side of the motor, it not only eliminates the reverse rotation The possibility of the polished rod coming into contact with people after the accident completely avoids the accident of hurting people, and also effectively prevents the upper end of the polished rod from being bent under the action of centrifugal force, reducing the chance of damage to the polished rod and other equipment under the reverse impact.

In addition, in the prior art, when repairing the direct drive device of the screw pump, it is necessary to call the truck crane to lift and dismantle the motor, but the utility model is equipped with a hydraulic lifting mechanism driven by a manual jack, and the manual jack can lift the motor up to several The 100-kilogram motor is lifted to expose the upper end of the polished rod, thereby realizing the replacement of thrust bearings and rotary seals. Therefore, maintenance is easier and less expensive.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a cross-sectional view at A in Fig. 1 .

In the figure: 1-well sealing device, 2-lower plate, 3-bearing seat, 4-hand jack that can be removed after use, 5-sliding sleeve, 6-sliding rod, 7-upper plate, 8-motor, 9-output shaft, 10-protective cover, 11-square card, 12-thrust bearing, 13-rotary seal, 14-polished rod.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

This embodiment includes a motor 8, a square clamp 11 and a polished rod 14. The motor 8 is erected above the well sealing device 1. The hollow output shaft 9 of the motor 8 is directly connected to the upper end of the polished rod 14, thereby driving the polished rod 14 to rotate. The above is a conventional structure in the prior art, and will not be repeated here.

In the prior art, the square clamp is arranged on the top of the motor, and the upper end of the polished rod 14 passes through the hollow output shaft 9 of the motor 8 and extends to the top of the motor 8, and the square clamp clamps the polished rod 14 on the top of the motor. When a reversal accident occurs, the polished rod 14 rotates at a high speed and bends under the action of centrifugal force, thereby causing potential safety hazards of casualties. Based on the above structure, scientific researchers have long been committed to solving the problem of wounding people by the reverse rotation of the polished rod 14 by developing reliable anti-reverse braking technology, but the utility model abandons this idea. In the utility model, there is a motor mounting frame between the well sealing device 1 and the motor 8, the motor 8 is fixedly installed on the top of the motor mounting frame, and the well sealing device 1 is connected to the bottom of the motor mounting frame through a flange. The motor mounting frame is a newly added structure in the utility model, which is used to clamp the square clamp 11 of the polished rod 14, the rotary seal 13 used to seal the polished rod 14, and the thrust bearing used to bear the axial load of the polished rod 14 12 and other connection structures are installed in the motor mounting frame. By restricting the position of the upper end of the polished rod 14, and arranging structures such as the square clamp 11 and the thrust bearing 12 on the lower side of the motor 8, it not only eliminates the possibility of the polished rod 14 coming into contact with people after the reverse accident occurs, but also completely avoids The accident of hurting people also effectively avoids the bending of the polished rod 14 upper end under the effect of centrifugal force, and reduces the probability of damage to parts such as the polished rod 14 under the reverse impact. The specific structure of the motor mounting bracket is as follows:

The motor mounting frame includes an upper plate 7, a lower plate 2 and a bearing seat 3, the motor 8 is fixedly installed on the upper side of the upper plate 7, the output shaft 9 of the motor 8 faces downward, and the lower plate 2 and the bearing seat 3 pass through the same A set of bolts is fixedly connected to the upper side of the capping device 1 , the bearing seat 3 is located on the upper side of the lower plate 2 , and a rotary seal 13 is arranged between the polished rod 14 and the bearing seat 3 .

In the motor mounting frame, at least three sets of sliding sleeves 5 and sliding rods 6 are arranged between the upper plate 7 and the bearing seat 3. Through the cooperation of the sliding sleeves 5 and the sliding rods 6, the upper plate 7 can be driven vertically by an external force. Steady sliding in one direction, wherein, the sliding sleeve 5 is fixed on the upper side of the bearing seat 3, the sliding rod 6 is fixed on the lower side of the upper plate 7, and a manual jack that can be removed after use is set between the upper plate 7 and the lower plate 2 4. By operating the manual jack 4, the upper plate 7 together with its upper motor 8 can be lifted up together. The upper end of the polished rod 14 passes through the hole in the center of the lower plate 2 and the bearing seat 3, the square card 11 for clamping the polished rod 14 is fixedly installed on the upper end of the polished rod 14, and the output shaft 9 of the motor 8 passes through the staggered The concave-convex fitting structure is connected to the top of the square card 11 to realize the function of a coupling, and a thrust bearing 12 is arranged between the bearing seat 3 and the square card 11 . In the screw pump direct drive device, the thrust bearing 12 and the rotary seal 13 are vulnerable parts and need to be replaced irregularly during use. In the prior art, when the screw pump direct drive device is being maintained, it is necessary to use a truck crane to lift and dismantle the motor, but the utility model is provided with a hydraulic lifting mechanism driven by a manual jack 4, through which the manual jack 4 can lift the motor up to several The 100-kg motor is lifted to expose the upper end of the polished rod 14, thereby realizing the replacement of the thrust bearing 12 and the rotary seal 13. During maintenance, the maintenance personnel only need to place the self-contained manual jack 4 at a predetermined position, and then drive the manual jack 4 is enough. Therefore, maintenance is easier and less expensive. The sliding sleeve 5 and the sliding rod 6 play a guiding and supporting role, so that the lifting process of the motor 8 is more stable. The manual jack 4 is detachable, and the manual jack 4 does not need to be separately equipped during equipment installation, thereby reducing the cost of the equipment.

The sliding fit between the sliding sleeve 5 and the sliding rod 6 can be locked and fixed by bolts, which further ensures the stability of the position of the motor 8 .

A protective cover 10 is installed on the underside of the upper plate 7 , and the axial dimension of the protective cover 10 is equal to the length of the sliding sleeve 5 . The protective cover 10 has two functions: on the one hand, the protective cover 10 provides another layer of reverse protection, which can effectively prevent parts such as bearings and square cards from flying out and hurting people due to accidental damage during reverse rotation; After dust enters the thrust bearing 12 and the rotary seal 13, the service life of both will be significantly shortened, and the setting of the protective cover 10 can effectively prevent dust from damaging the thrust bearing 12 and the rotary seal 13.

Claims (3)

1. The utility model provides a screw pump ground directly drives oil recovery device with prevent function of reversing, includes motor (8), square card (11) and polished rod (14), and motor (8) are erect in the top of blowout preventer (1), and hollow output shaft (9) of motor (8) are direct to be connected with the upper end of polished rod (14) to drive polished rod (14) rotatory, its characterized in that: a motor mounting frame is arranged above the blowout preventer (1), a motor (8) is fixedly mounted at the top of the motor mounting frame, and the blowout preventer (1) is connected to the bottom of the motor mounting frame through a flange;

the motor mounting rack comprises an upper plate (7), a lower plate (2) and a bearing seat (3), wherein the motor (8) is fixedly mounted on the upper side of the upper plate (7), an output shaft 9 of the motor (8) faces downwards, the lower plate (2) and the bearing seat (3) are fixedly connected to the upper side of the well sealer (1) through the same group of bolts, the bearing seat (3) is located on the upper side of the lower plate (2), a rotary sealing member (13) is arranged between a polished rod (14) and the bearing seat (3), at least three groups of sliding sleeves (5) and sliding rods (6) are arranged between the upper plate (7) and the bearing seat (3), the upper plate (7) can stably slide along the vertical direction under the drive of external force through the matching of the sliding sleeves (5) and the sliding rods (6), wherein the sliding sleeves (5) are fixed on the upper side of the bearing seat (3), the sliding rods (6) are fixed on the lower side of the upper plate (7), a manual jack (4) capable of moving backwards is arranged between the upper plate (7) and the lower plate (2), and the upper plate (7) and the motor (8) can be lifted together with the motor (8) by operating the manual jack (4);

the upper end of polished rod (14) pass by hypoplastron (2) and the hole of bearing frame (3) central authorities, square card (11) fixed mounting for pressing from both sides tight polished rod (14) is in the upper end of polished rod (14), output shaft (9) of motor (8) are connected at the top of square card (11) through the unsmooth cooperation structure of crisscross setting to realize the effect of shaft coupling, be provided with thrust bearing (12) between bearing frame (3) and square card (11).

2. The ground direct-drive oil production device of the screw pump with the anti-reverse function of claim 1, which is characterized in that: the sliding fit between the sliding sleeve (5) and the sliding rod (6) can be locked and fixed through bolts.

3. The ground direct-drive oil production device of the screw pump with the anti-reverse function of claim 1, which is characterized in that: the lower side of the upper plate (7) is provided with a protective cover (10), and the axial size of the protective cover (10) is equal to the length of the sliding sleeve (5).

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