CN204646658U - Screw pump sealing load carrier - Google Patents

Abstract

The utility model relates to a sealing load-bearing device of a screw pump. It mainly solves the problems in the prior art that the mechanical seal or the single-ring seal structure has an unsatisfactory sealing effect and the rise of wellhead pressure easily causes production accidents and affects safe production. It is characterized in that: the vertical end of the upper shaft of the motor shaft (9) is fixed with a sealing seat (6) by bolts (2); a fragile sleeve (8) is placed between the long axis of the flange (14) and the sealing seat (6) ; The outer wall of the top end of the motor shaft (9) is provided with a sealing jacket (7); the lower shaft of the motor shaft (13) is externally fixed with a load-bearing box (15), and the lower end of the lower shaft of the motor shaft (13) is sequentially equipped with a plane bearing flange (5 ), one-way thrust bearing movable clamping block (12) and thrust bearing (10), the plane bearing flange (5) is fixed on the bottom shell of the motor (1), and the lower end surface of the lower shaft of the motor shaft (13) is fixed with a high-voltage Rotate seal shaft (4). The sealed load-bearing device of the screw pump is resistant to high pressure, bidirectionally loaded, and has good sealing effect.

Description

Screw pump seal bearing device

technical field

The utility model relates to an auxiliary device in the field of petroleum mechanical oil recovery ground equipment, in particular to a screw pump sealing load-bearing device.

Background technique

In the process of oilfield development, rod pumps are usually used to pump oil. Due to the high working temperature, the composition of oil, gas and water produced from the formation is complex, which causes the loss of oil, water and gas during the oil pumping process, and the pressure is also unstable during the oil pumping process, especially due to factors such as freezing, blockage, and well washing of the surface pipeline. It is easy to cause the wellhead pressure to rise, causing the sucker rod and square clamp to move up out of control, causing production accidents, forcing the pumping well to be shut down, and affecting normal production. At present, mechanical seals or single-ring seal structures are generally used. There is still a small amount of oil, gas and water leakage for a long time during work. The single-ring seal structure fails after long-term work, and the sealing effect is not ideal.

Contents of the invention

The technical problem to be solved by the utility model is to overcome the problems in the background technology that the mechanical seal or the single-ring seal structure has poor sealing effect and the increase of the wellhead pressure may easily cause production accidents, and provide a screw pump sealing load-bearing device. Screw pump seal load-bearing device, high pressure resistance, two-way bearing, good sealing effect.

The utility model solves the problem through the following technical solutions: the screw pump seal load-bearing device includes a motor, a flange long shaft, a load-bearing box, and a motor shaft. The motor shaft is equipped with a flange long shaft; the lower end of the flange long shaft is fixed. On the load-bearing box shell, the upper shaft end of the motor shaft is fixed with a seal seat by bolts; a vulnerable sleeve is placed between the long axis of the flange and the seal seat; a seal coat is placed on the outer wall of the top end of the motor shaft; The load-bearing box is fixedly installed, and the lower end of the lower shaft of the motor shaft is equipped with a plane bearing flange, a one-way thrust bearing movable clamp block and a thrust bearing in turn, the plane bearing flange is fixed on the bottom shell of the motor, and the lower end of the motor shaft lower shaft is fixedly installed. There is a high-pressure rotary sealed shaft; the lower shaft of the motor shaft, the flat bearing flange, the movable clamp block of the one-way thrust bearing and the thrust bearing, and the high-pressure rotary sealed shaft are placed inside the load-bearing box.

Compared with the above-mentioned background technology, the utility model has the following beneficial effects: the screw pump sealing and load-bearing device adopts the above-mentioned structure, which can withstand high pressure and prevent leakage, and can achieve no leakage and no seepage of oil and water vapor. The friction pair of the sealing chamber adopts the method of wearing parts, which is more convenient and simple to replace. The material is made of wear-resistant and corrosion-resistant materials, and the service life is longer. The plane bearing flange and the thrust bearing form a two-way load-bearing structure, which can prevent the polished rod from moving up uncontrollably and bending when the polished rod and the square clip rotate at high speed.

Description of drawings:

Accompanying drawing 1 is the structural representation of the utility model;

Accompanying drawing 2 is the structural representation of Fig. 1 motor top;

Accompanying drawing 3 is the structural representation of Fig. 1 motor bottom.

In the figure: 1-motor, 2-bolt, 3-sealing ring, 4-high-pressure rotary seal shaft, 5-plane bearing flange, 6-sealing seat, 7-seal jacket, 8-fragile sleeve, 9-motor shaft , 10-thrust bearing, 11-oil plug, 12-one-way thrust bearing movable clamp block, 13-lower shaft, 14-flange long shaft, 15-bearing box, 16-oil drain plug.

Specific implementation methods :

The utility model will be further described below in conjunction with accompanying drawing:

As shown in attached drawings 1, 2, and 3, the sealing and load-bearing device used in the direct drive device of the oil production screw pump includes a motor 1, a flange long shaft 14, and a motor shaft 9, and the motor shaft 9 is equipped with a flange long shaft 14. The lower end of the flange long shaft 14 is fixed on the shell of the load-bearing box 15; the vertical end of the upper shaft of the motor shaft 9 is fixed with a seal seat 6 through a bolt 2, and the anti-turning screw is used to rotate forward and become tighter in the working state. The double insurance method is adopted to effectively prevent buckling; a vulnerable sleeve 8 is placed between the long axis of the flange 14 and the seal seat 6; a seal coat 7 is placed on the outer wall of the top end of the motor shaft 9; the distance between the motor shaft 9 and the seal seat 6 is There is a sealing ring 3 between the long shaft 14 of the blue and the vulnerable sleeve 8; a load-bearing box 15 is fixed outside the shaft 13 under the motor shaft, and an oil plug 11 and an oil drain plug 16 are installed in the radial channel at the lower end of the load-bearing box 15; The lower end of the shaft lower shaft 13 is equipped with a plane bearing flange 5, a one-way thrust bearing movable clamp block 12 and a thrust bearing 10 in turn, and the plane bearing flange 5 is fixed on the bottom shell of the motor 1, and the lower end surface of the motor shaft lower shaft 13 is fixed. There is a high-pressure rotary sealing shaft 4; the lower shaft 13 of the motor shaft, the plane bearing flange 5, the one-way thrust bearing movable clamp block 12 and the thrust bearing 10, and the high-pressure rotary sealing shaft 4 are placed inside the load-bearing box 15; the material of the sealing ring is PTFE, wear-resistant, anti-corrosion, longer service life.

The high-pressure resistant sealing jacket 7, the vulnerable sleeve 8 and the sealing seat 6, the lower end of the motor shaft lower shaft 13 and the high-pressure rotary sealing shaft 4 form two upper and lower connected sealing chambers, and the two connected sealing chamber structures prevent leakage , can achieve no leakage or seepage of a drop of oil and water vapor. The sealing friction pair vulnerable sleeve 8 can be replaced at any time after failure. The thrust bearing is installed at the lower end of the motor shaft, and the one-way thrust bearing movable clamp is installed at the lower end of the motor shaft to float in the non-stressed direction, and the other direction is fixed, which saves the process of adjusting the bearing clearance, and the load-bearing bearing maintains the best working condition for a long time. The plane bearing flange and the thrust bearing form a two-way load-bearing structure, which can prevent the polished rod from moving up uncontrollably and bending when the polished rod and the square clip rotate at high speed.

Claims (4)

1. A sealed load-bearing device for a screw pump, including a motor (1), a flange long shaft (14), a load-bearing box (15), a motor shaft (9), and a flange long shaft (14) inside the motor shaft (9) The lower end of the flange long axis (14) is fixed on the shell of the load-bearing box (15), which is characterized in that: the upper shaft end of the motor shaft (9) is fixed with a seal seat (6) through bolts (2); the flange There is a fragile sleeve (8) between the long shaft (14) and the seal seat (6); a sealing jacket (7) is placed on the outer wall of the top end of the motor shaft (9); 15), the lower end of the motor shaft lower shaft (13) is sequentially equipped with a plane bearing flange (5), a one-way thrust bearing movable clamp block (12) and a thrust bearing (10), and the plane bearing flange (5) is fixed on the motor ( 1) On the bottom shell, the lower end of the motor shaft lower shaft (13) is fixed with a high-pressure rotary seal shaft (4); the motor shaft lower shaft (13), the plane bearing flange (13), and the movable clamping block of the one-way thrust bearing (12), thrust bearing (10), and high-pressure rotary seal shaft (4) are placed inside the load-bearing box (15). 2. The sealing load-bearing device of screw pump according to claim 1, characterized in that: an oil plug (11) and an oil drain plug (16) are installed in the radial channel at the lower end of the load-bearing box (15). 3. The screw pump sealing load-bearing device according to claim 1, characterized in that: between the motor shaft (9) and the seal seat (6), between the flange long axis (14) and the vulnerable sleeve (8) There is a sealing ring (3). 4. The screw pump sealing and bearing device according to claim 1 or 3, characterized in that: the material of the sealing ring (3) is polytetrafluoroethylene.