Anti-reverse braking device of oil extraction screw pump

Abstract

The utility model belongs to the technical field of oil extraction screw pumps, and discloses an anti-reverse braking device for an oil extraction screw pump, which comprises an upper box cover and a driving device, a hollow shaft is fixedly connected in the driving device, a pin shaft is mounted at the top end of the upper box cover, brake shoes are symmetrically and rotatably connected to the outer side of the pin shaft, and the upper box cover is fixedly connected with the hollow shaft. An overrun clutch is installed at the position, between the two brake shoes, of the top end of the upper box cover. Friction lining blocks are fixedly connected to the inner walls of the two brake shoes. The friction force of the friction lining blocks on the outer ring of the overrun clutch is adjusted by adjusting the pressing force of the hexagon socket cap screws on the two brake shoes, so that the braking torque of equipment is adjusted, the situation that a sucker rod rotates reversely at a high speed within a short time when a screw pump is shut down for maintenance or stuck is avoided, and the service life of the sucker rod is prolonged. Therefore, the elastic energy stored in the sucker rod is stably released.

Description

TECHNICAL FIELD

[0001] The utility model belongs to oil production screw rod pump technical field especially relates to an oil production screw rod pump anti-reverse brake device. BACKGROUND

[0002] The sucker rod of the screw rod pump is a torque sucker rod. According to different well depths, the overall length of the sucker rod between the screw rod pump ground driving device and the screw rod pump rotor generally reaches more than 1km. At this time, the sucker rod will produce obvious elastic deformation, and the energy is stored in the sucker rod in the form of strain energy. Under normal working conditions, the elastic deformation will not affect production.

[0003] However, when the screw rod pump is shut down for maintenance or pump jamming, reverse release will occur, and the accumulated strain energy will cause the sucker rod to reverse at high speed for a short time, causing mechanical damage. In order to prevent the screw rod pump oil production system from reversing quickly when it is shut down, a wellhead anti-reverse device needs to be used on the screw rod pump driving device to release the elastic energy of the sucker rod smoothly. UTILITY MODEL CONTENTS

[0004] The utility model discloses to the screw rod pump shut down for maintenance or pump jamming in prior art, reverse release will occur, and the accumulated strain energy will cause the sucker rod to reverse at high speed for a short time, causing mechanical damage, and the following technical scheme is proposed:

[0005] An oil production screw rod pump anti-reverse brake device, comprising: an upper box cover and a driving device, the inside of the driving device is fixedly connected with a hollow shaft, the top end of the upper box cover is provided with a pin shaft, the outer side of the pin shaft is symmetrically connected with a brake shoe in rotation, the top end of the upper box cover is provided with an overrunning clutch between the two brake shoes, and the inner walls of the two brake shoes are fixedly connected with friction pads.

[0006] As a preferred embodiment of the above technical scheme, the inner walls of the two friction pads are in contact with the outer ring of the overrunning clutch.

[0007] As a preferred embodiment of the above technical scheme, the inner ring of the overrunning clutch is connected with the hollow shaft through a key.

[0008] As a preferred embodiment of the above technical scheme, the outer sides of the two brake shoes are fixedly connected with fixed blocks, and the inside of one of the fixed blocks is threadedly connected with an internal hexagonal cylindrical head screw.

[0009] As a preferred embodiment of the above technical scheme, the outer side of the other fixed block is fixedly connected with a compression spring, and the other end of the compression spring is fixedly connected with an auxiliary ring.

[0010] As a preferred embodiment of the above technical scheme, the inside of the auxiliary ring is provided with a plurality of groups of balls, and the inside of the internal hexagonal cylindrical head screw is provided with a groove corresponding to the outer side position of the balls.

[0011] The utility model discloses the beneficial effect is:

[0012] The utility model discloses a screw pump's drive arrangement installs the overrunning clutch, adjusts the compression tightness of two brake shoes through the inner hexagonal head screw, and then adjusts the friction of the overrunning clutch outer ring of friction pad, thereby the size of the equipment braking torque is adjusted, avoids the screw pump shutdown overhauls or when the pump is stuck, and the sucker rod is high speed reverse in short time, thereby the elastic energy that stores in the sucker rod inside can be released steadily. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It shows the structure diagram of a kind of oil extraction screw pump anti-reverse brake device;

[0014] Figure 2 It shows the top view of partial structure;

[0015] Figure 3 It shows the structure diagram of brake shoe;

[0016] Figure 4 It shows the structure diagram of inner hexagonal head screw.

[0017] In the drawing: 1, upper box cover;2, drive arrangement;21, hollow shaft;3, overrunning clutch;4, pin shaft;5, brake shoe;51, friction pad;6, fixed block;7, inner hexagonal head screw;8, compression spring;9, auxiliary ring;10, ball;11, recess. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the utility model technical scheme will be clearly and completely described below in conjunction with embodiment.

[0019] Embodiment 1

[0020] The utility model provides a kind of oil extraction screw pump anti-reverse brake device, such as Figures 1 to 4As shown, including: the upper box cover 1 and driving device 2, the inside fixed connection of driving device 2 has hollow shaft 21, the top end of upper box cover 1 is installed with pin shaft 4, the outer side of pin shaft 4 is connected with brake shoe 5, the brake shoe 5 between the top end of upper box cover 1 is installed with overrunning clutch 3, the inner wall of two brake shoes 5 is fixedly connected with friction lining 51, the inner wall of two friction linings 51 is contacted with the outer ring of overrunning clutch 3, the inner ring of overrunning clutch 3 is connected with hollow shaft 21 through flat key, the outer side of two brake shoes 5 is fixedly connected with fixed block 6, one of fixed block 6 is connected with internal hexagonal head screw 7 through thread in the inside, in normal operation, the hollow shaft 21 on driving device 2 is connected with the inner ring of overrunning clutch 3 through flat key, make the inner ring of overrunning clutch 3 and hollow shaft 21 synchronous rotation, realize the operation of equipment, when screw pump oil production system occurs shutdown reverse, the inner ring and outer ring of overrunning clutch 3 contact, then the friction lining 51 and the outer ring of overrunning clutch 3 contact and produce friction force, by adjusting the compression of internal hexagonal head screw 7 to two brake shoes 5, then adjust the torque size when equipment braking, so as to realize the braking of driving device 2, avoid the rapid reverse of screw pump oil production system when shutdown, cause the damage of oil production system, can make the elastic energy of pumping rod release smoothly.

[0021] As Figures 1 to 4 As shown, the other side of fixed block 6 is fixedly connected with compression spring 8, the other end of compression spring 8 is fixedly connected with auxiliary ring 9, when rotating internal hexagonal head screw 7 to adjust the size of braking torque, can avoid the friction contact of compression spring 8 with rotating internal hexagonal head screw 7 by the action of auxiliary ring 9, so as to reduce the physical damage of compression spring 8 due to friction, prolong the service life of compression spring 8, the inside of auxiliary ring 9 is installed with several groups of ball 10, the inside of internal hexagonal head screw 7 is provided with recess 11 corresponding to the outer side position of ball 10, when unscrewing internal hexagonal head screw 7, two brake shoes 5 can be opened outward around pin shaft 4 under the action of the elastic force of compression spring 8, can make ball 10 slide on recess 11 when internal hexagonal head screw 7 rotates, so as to effectively slow down the sliding friction between auxiliary ring 9 and internal hexagonal head screw 7 when internal hexagonal head screw 7 rotates.

[0022] Working principle: In actual use, one end of each of the two brake shoes 5 is fixed to the upper cover 1 by a pin 4, and the other end of each brake shoe 5 is connected by a hexagonal socket head cap screw 7. This allows the two semi-circular brake shoes 5 to surround the outer side of the overrunning clutch 3 in a circular shape. During actual braking, the overrunning clutch 3 acts as the main braking function switching component. By adjusting the clamping force of the hexagonal socket head cap screw 7 on the two brake shoes 5, the friction force between the friction pad 51 inside the brake shoes 5 and the outer ring of the overrunning clutch 3 is adjusted, thereby adjusting the braking torque of the equipment. Under normal operation, such as... Figure 2 As shown, the inner ring of the overrunning clutch 3 rotates clockwise synchronously with the hollow shaft 21 and the drive device 2. When the equipment stops and reverses, the inner and outer rings of the overrunning clutch 3 come into contact, and the friction pad 51 comes into contact with the outer ring of the overrunning clutch 3 to generate friction. Through the action of friction, the braking purpose of the equipment can be achieved, avoiding high-speed reverse rotation in a short time when the sucker rod on the screw pump stops, so that the elastic energy on the sucker rod can be released smoothly.

[0023] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A reverse braking device for an oil production screw pump, characterized in that, Include: The upper box cover (1) and drive device (2), the inside fixed connection of drive device (2) hollow shaft (21), the top of upper box cover (1) is installed with pin shaft (4), the outer side of pin shaft (4) is connected with brake shoe (5) symmetry rotation, the top of upper box cover (1) is located between two brake shoe (5) and is installed with overrunning clutch (3), the inner wall of two brake shoe (5) is fixedly connected with friction pad (51).

2. The anti-reverse rotation braking device for a production screw pump according to claim 1, characterized by The inner wall of two friction pads (51) is in contact with the outer ring of overrunning clutch (3).

3. The anti-reverse rotation braking device for a production screw pump according to claim 1, characterized by The inner ring of overrunning clutch (3) is connected with hollow shaft (21) through flat key.

4. The anti-reverse rotation braking device for a production screw pump according to claim 1, characterized by The outer side of two brake shoes (5) is fixedly connected with fixed block (6), and the inside of one fixed block (6) is connected with internal hexagonal cylindrical head screw (7) through thread.

5. The anti-reverse rotation braking device for a production screw pump according to claim 4, characterized by The outer side of another fixed block (6) is fixedly connected with compression spring (8), and the other end of compression spring (8) is fixedly connected with auxiliary ring (9).

6. The anti-reverse rotation braking device for a production screw pump according to claim 5, characterized by The inside of auxiliary ring (9) is installed with several groups of ball (10), and the inside of internal hexagonal cylindrical head screw (7) is provided with groove (11) corresponding to the outer side position of ball (10).

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