CN210637059U

CN210637059U - Ground driving device of polished rod concealed screw pump

Info

Publication number: CN210637059U
Application number: CN201921548536.1U
Authority: CN
Inventors: 吴法祥; 张桂林; 张志刚; 董超; 李金康
Original assignee: Shandong Shouguang Kunlong Petroleum Machinery Co ltd
Current assignee: Shandong Shouguang Kunlong Petroleum Machinery Co ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-05-29
Anticipated expiration: 2029-09-18

Abstract

The ground driving device of the polished rod concealed screw pump comprises a polished rod and a direct-drive permanent magnet motor, wherein the bottom of the direct-drive permanent magnet motor is sequentially connected with a bearing box and a sealing packing cavity; the top of the polish rod is provided with an outer hexagonal joint in small clearance fit with the inner hexagonal groove. The utility model discloses can reduce exposing of rotary part, avoid the appearance of abnormal conditions, eliminate the potential safety hazard that the polished rod was got rid of the bend, greatly improve the safety and stability nature of drive arrangement operation, guarantee that the screw pump oil recovery goes on smoothly.

Description

Ground driving device of polished rod concealed screw pump

Technical Field

The utility model relates to a screw pump drive technical field, concretely relates to hidden screw pump ground drive of polished rod.

Background

Traditionally, a screw pump ground driving device adopts a polish rod clip to transmit torque, and the polish rod clip is arranged above a hollow shaft of the driving device and is matched with the hollow shaft through a clamping groove; the polish rod clip is locked with the polish rod inserted into the hollow shaft, and has the functions of bearing the weight of the rod column and transmitting the torque applied to the hollow shaft by the driving device to the polish rod. When the machine is stopped, the elastic potential energy stored in the rod column can generate huge instantaneous torque to drive the polish rod clip and the polish rod to rotate reversely at a high speed.

The driving device usually adopts electromagnetism to prevent reverse rotation, so as to prevent safety accidents caused by too high reverse rotation speed, and when the motor is overloaded or a control system has a fault, the reverse rotation prevention function is easy to lose effectiveness, so that the reverse rotation speed is out of control; and because the bare rod clamp and the exposed part of the bare rod are higher than the driving device, the bare rod is flapped and bent, the protective cover is broken and the like in the process of high-speed rotation, so that the safety of equipment and personnel is endangered.

Disclosure of Invention

The utility model discloses the technical problem that will solve is:

the ground driving device of the polished rod hidden screw pump can reduce the exposure of a rotating part, avoid the occurrence of abnormal conditions, eliminate the potential safety hazard that the polished rod is thrown and bent, greatly improve the safety and stability of the operation of the driving device and ensure that the oil extraction of the screw pump is carried out smoothly.

In order to solve the technical problem, the technical scheme of the utility model is that:

the ground driving device of the polished rod concealed screw pump comprises a polished rod and a direct-drive permanent magnet motor, wherein the bottom of the direct-drive permanent magnet motor is sequentially connected with a bearing box and a sealing packing cavity, a rotor shaft of the direct-drive permanent magnet motor is a hollow shaft, the polished rod is coaxially inserted into the hollow shaft, the top of the hollow shaft is in threaded connection with a pressing cap, the top of the hollow shaft is provided with an internal thread matched with the pressing cap for use, and the lower part of the internal thread is provided with an internal hexagonal groove which is coaxial with the hollow shaft;

and the top of the polish rod is provided with an outer hexagonal joint in small clearance fit with the inner hexagonal groove.

Preferably, the side surfaces of the outer hexagonal joint are in arc transition.

Preferably, the bearing surface of the inner hexagonal groove is an inward concave arc surface, and an outward convex arc surface is arranged between the bottom of the outer hexagonal joint and the polish rod body.

Preferably, the outer end face of the press cap is flush with the outer end face of the hollow shaft.

After the technical scheme is adopted, the beneficial effects of the utility model are that:

through the utility model, the direct-drive permanent magnet motor with a hollow shaft structure is adopted as a driving device, and the top of the rotor shaft is provided with an internal thread matched with the press cap and an internal hexagonal groove; the top of the polish rod is provided with an outer hexagonal joint in small clearance fit with the inner hexagonal groove. In the utility model, the existence of a polish rod clip is cancelled, the hexagonal matching is adopted to transmit torque, and the matching surface is positioned inside the hollow shaft, so that the exposed rotating mechanism is reduced; when the condition that takes place to prevent the function inefficacy of reversing, the utility model discloses owing to do not have exerted polished rod and checkpost, can not take place the polished rod and get rid of the circumstances of bending, polished rod checkpost break away from the main shaft, guarantee safe operation.

And simultaneously, the utility model discloses in, because the operation that the scene need not to carry out checkpost locking polished rod, consequently improve work efficiency, can avoid effectively simultaneously because of the not hard up polished rod slippage phenomenon that appears of checkpost centre gripping, improved the operational safety nature.

The utility model discloses in, the loading end of interior hexagonal groove is the arc surface of indent, for the arc surface of evagination between the bottom that outer hexagonal connects and the polished rod body, has optimized the atress condition in the hexagonal groove.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic view of the construction of the rotor shaft of FIG. 2;

FIG. 4 is a schematic structural view of a polish rod;

in the figure: 1-polished rod, 11-outer hexagonal joint, 2-direct drive type permanent magnet motor, 3-bearing box, 4-sealing packing cavity, 5-hollow shaft, 51-internal thread, 52-inner hexagonal groove and 6-pressing cap.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1 to 3, the utility model discloses a polished rod 1 and direct drive formula permanent-magnet machine 2, direct drive formula permanent-magnet machine 2's bottom has connected gradually bearing box 3 and sealed packing chamber 4, direct drive formula permanent-magnet machine 2's rotor shaft is hollow shaft 5, the coaxial cartridge of polished rod 1 is in hollow shaft 5, the top of hollow shaft 5 is provided with the internal thread 51 that uses with the cooperation of pressure cap 6, the outer terminal surface of pressure cap 6 flushes with the outer terminal surface of hollow shaft 5, internal thread 51's lower part is provided with interior hexagonal groove 52, the loading end of interior hexagonal groove 52 is the arc surface of indent.

The top of the polished rod 1 is provided with an outer hexagonal joint 11 in small clearance fit with the inner hexagonal groove 52, a convex arc surface is arranged between the bottom of the outer hexagonal joint 11 and the polished rod 1 body, and arc transition is arranged between the side surfaces of the outer hexagonal joint 11.

The utility model discloses when using, pass the inside of hollow shaft 5 with polished rod 1, during the hexagonal joint 11 of polished rod 1 fell into interior hexagonal groove 52, the butt joint of axial hexagonal, outer hexagonal joint 11 and interior hexagonal groove 52 booth clearance fit, the transmission moment of torsion realized directly driving formula permanent-magnet machine to polished rod 1's drive, and sealed packing chamber 4's bottom is stretched out to polished rod 1's lower part, with the post connection, via the operation of post drive screw pump again. In a bearing state, the transition surface at the lower part of the outer hexagonal joint 11 of the polish rod 1 is a convex arc surface which is pressed on the bearing surface of the inner hexagonal groove 52, and the load of the rod column acts on the hollow shaft 5; a thrust bearing is installed in the bearing box 3 to bear the load, and the sealing packing cavity 4 is sealed with the polishing rod body at the lower end of the polish rod 1.

The utility model discloses in, with original polished rod checkpost cooperation draw-in groove of adopting, realize bearing rod post weight and transmit the drive mode on the polished rod with drive arrangement acts on the moment of torsion on the hollow shaft, change into, adopt polished rod 1 directly to fall into hollow shaft 5 inside, by hollow shaft 5 direct drive polished rod 1's drive mode. The existence of a polish rod clamp is eliminated, the torque is transmitted by adopting hexagonal matching, and the matching surface is positioned in the hollow shaft, so that the exposed rotating mechanism is reduced; when the condition of preventing the function inefficacy that reverses takes place, the utility model discloses owing to do not have exerted polished rod 1 and polished rod checkpost, can not take place polished rod 1 and get rid of the circumstances that the turn, polished rod checkpost break away from the main shaft, guarantee safe operation.

And simultaneously, the utility model discloses in, owing to the scene need not to carry out the operation of checkpost locking polished rod 1, consequently improve work efficiency, can avoid effectively simultaneously because of the not hard up polished rod 1 slippage phenomenon that appears of checkpost centre gripping, improved the operational safety nature.

In the present invention, the top of the hollow shaft 5 is provided with an internal thread 51 used in cooperation with the press cap 6. Be provided with on the pressure cap 6 with internal thread 51 complex external screw thread, through being provided with pressure cap 6, the outer terminal surface of pressure cap 6 flushes with the outer terminal surface of hollow shaft 5, and pressure cap 6 can play the guard action to polished rod 1, improves stability and security.

The utility model discloses in, the loading end of interior hexagonal groove 52 is the arc surface of indent, is the arc surface of evagination between the bottom that outer hexagonal connects 11 and the polished rod 1 body, and outer hexagonal connects for the arc transition between each side of 11. The arc surface is adopted for carrying out the bearing surface, and the arc surface at the bottom of the outer hexagonal joint 11 is superposed with the bearing surface, so that the stress condition of the inner hexagonal groove 52 is optimized.

To sum up, in the utility model, the polish rod 1 does not extend out of the driving device any more, and a polish rod clip is cancelled; the polished rod 1 is sunk into the hollow shaft 5, the hexagonal joint is matched, the torque transmission of positive and reverse rotation can be realized, the torque transmission of the hexagonal mechanism is stable, the transmission of large torque cannot be damaged, and the operation reliability is ensured; when the rotary drum rotates at a high speed, the risk of bending of the exposed part is avoided, the safe and reliable operation of the system is ensured, and the occurrence of safety accidents is avoided.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The ground driving device of the polished rod concealed screw pump comprises a polished rod and a direct-drive permanent magnet motor, wherein the bottom of the direct-drive permanent magnet motor is sequentially connected with a bearing box and a sealing packing cavity,

the rotor shaft of the direct-drive permanent magnet motor is a hollow shaft, a polished rod is coaxially inserted into the hollow shaft, the top of the hollow shaft is in threaded connection with a pressing cap, the top of the hollow shaft is provided with an internal thread matched with the pressing cap for use, and the lower part of the internal thread is provided with an internal hexagonal groove coaxial with the hollow shaft;

2. The polished rod concealed screw pump ground drive of claim 1, wherein there is an arcuate transition between the sides of the hexagonal outer joint.

3. The ground driving device of the polished rod concealed screw pump according to claim 1, wherein the bearing surfaces of the inner hexagonal grooves are concave arc surfaces, and an outer convex arc surface is arranged between the bottom of the outer hexagonal joint and the polished rod body.

4. The polished rod concealed screw pump ground drive according to claim 1, wherein an outer end face of the pressure cap is flush with an outer end face of the hollow shaft.