CN212381036U

CN212381036U - Sealing system of radial magnetic circuit submersible linear motor

Info

Publication number: CN212381036U
Application number: CN202021185927.4U
Authority: CN
Inventors: 陈天为; 李勇
Original assignee: Individual
Current assignee: Zhejiang Mingshite Petroleum Equipment Co ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2021-01-19
Anticipated expiration: 2030-06-24

Abstract

The utility model discloses a sealing system of a radial magnetic circuit submersible linear motor, which comprises a sealing tube, wherein a flow passage is arranged in the middle of the sealing tube, and a multistage sealing mechanism is arranged in the flow passage of the sealing tube; the multistage sealing mechanism comprises a plurality of sealing groups and sliding bearings arranged on two sides of the sealing groups, and a plurality of sealing grooves used for mounting sealing rings are arranged at the butt joint positions of the sliding bearings and the sealing pipes. The utility model discloses following beneficial effect has: the sealing system of the radial magnetic circuit submersible linear motor can prevent the linear motor from entering water from the inside and the outside and from the top and the bottom, and keeps better sealing performance.

Description

Sealing system of radial magnetic circuit submersible linear motor

Technical Field

The utility model relates to a sealing device, in particular to radial magnetic circuit dive linear electric motor's sealing system.

Background

As most oil fields enter the middle and later development stages in succession, the well conditions become more complex, the requirements on oil stabilization, water control and energy conservation are continuously improved, and intelligent, efficient and low-loss oil extraction equipment becomes the key point of research and development of the petroleum mechanical equipment industry. Therefore, various energy-saving power equipment such as ultrahigh slip ratio motors, variable frequency speed regulating motors, double-power motors, motor voltage regulating devices and the like are continuously developed and applied in oil fields, and the automation control level is correspondingly improved. After the linear motor replaces a rotating motor due to excellent driving performance, the system efficiency is obviously improved.

Linear motors have their unique application in downhole operations. When working underground, the linear motor can be divided into a linear motor oil pumping unit and a linear motor oil pumping unit.

The linear motor pumping unit, like the rod pumping unit, has a ground portion, a middle portion and a downhole pump. The middle part is mainly a sucker rod and other transmission components, the underground pump is a plunger pump, and the ground part mainly comprises a cable, a traction rope, a balance wheel, a support, a linear motor, a guide frame, a weight box, a sensor, a frequency converter control cabinet and the like. The support is fixed on the base, the secondary motor is fixed on the support, the fixed platform is supported by the support, and the balance wheel can be a single wheel or a big wheel and a small wheel which are arranged in parallel are arranged on the balance wheel platform. The linear motor stator is fixed inside the bracket and is formed by welding a steel plate and a section bar. The edge of the stator plate is provided with a limiting block for controlling the primary trend of the motor. The guide rail plays a guiding role and is used for protecting the motor. The lower part of the motor rotor is connected with a weight box which is used for increasing and decreasing the balance weight to adjust the balance of the whole machine. The traction rope adopts two steel wire ropes, one end of each steel wire rope is connected with the rope hanger, the other end of each steel wire rope is connected to the motor rotor, the traction rope respectively bypasses pulleys on the rope hanger and is connected with the motor rotor after the direction is changed through a large wheel and a small wheel. The linear motor rotor is directly connected with the sucker rod through a flexible connecting piece, a steel wire rope and a guide wheel. The motion of the rotor is completely consistent with the up-and-down motion of the plunger of the oil pumping pump, and the motor drives the oil pumping rod to move up and down through the traction rope, so that the oil pumping process is completed.

The linear motor oil extraction pump mainly comprises a ground numerical control device, an underground magnetic driving plunger pump, a special cable and a liquid level monitor, wherein the underground magnetic driving plunger pump comprises a linear motor, a sieve tube, a plunger pump and the like. The plunger pump is positioned below the cylindrical linear motor, and the plunger pump and the cylindrical linear motor are connected through the permanent magnet rotor and the connecting rod. After the system is electrified, the linear motor rotor drives the plunger to do up-and-down reciprocating motion, so that the purpose of lifting and pumping oil is achieved, and meanwhile, the system is also provided with underground pressure and temperature sensors for monitoring the working pressure and temperature of the sinking position of the pump.

Chinese patent No. CN201118296Y discloses a self-sealing structure of a permanent magnet of an oil-submersible linear motor, which comprises an annular permanent magnet, and is characterized in that magnetic conductive metal material layers with surfaces subjected to wear-resistant and corrosion-resistant treatment are arranged on the upper and lower end faces of the annular permanent magnet, a non-magnetic conductive metal ring with surfaces subjected to wear-resistant and corrosion-resistant treatment is arranged on the outer circumferential surface of the annular permanent magnet, a corrosion-resistant non-magnetic conductive metal ring is arranged on the inner circumferential surface of the annular permanent magnet, and the magnetic conductive metal material layers arranged on the upper and lower end faces are connected with the non-magnetic conductive metal rings arranged on the inner and outer circumferential surfaces in. The utility model has the advantages that during the sealed environment was arranged in to annular permanent magnet, isolated the multiple corrosive medium in the well liquid to its corrosive action, avoided the chemical change on the inside and surface of permanent magnet, stabilized the magnetic properties of permanent magnet, the anti-corrosion of surface, wear resistance reinforcing, and then improved permanent magnetic material's compressive strength, improved oily linear electric motor active cell's of diving anti-corrosion, wear resistance to improve oily linear electric motor's of diving life.

However, such linear motors focus on pressure resistance and corrosion resistance in a sealed environment. In the practical use process, the heat generated by the underground linear motor is large, the whole machine is easily overheated, and meanwhile, the sealing performance is kept good to prevent other liquid from entering the interior of the linear motor part. Therefore, in the case of a complicated underground working environment, attention needs to be paid to the sealing performance of the linear motor to prolong the service life of the linear motor and improve the working efficiency, and the problem of the sealing performance of the linear motor cannot be considered.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a radial magnetic circuit dive linear electric motor's sealing system. The sealing system of the radial magnetic circuit submersible linear motor can prevent the linear motor from entering water from the inside and the outside and from the top and the bottom, and keeps better sealing performance.

The invention aims to be realized by the following technical scheme:

a sealing system of a radial magnetic circuit submersible linear motor comprises a sealing tube, wherein a flow passage is arranged in the middle of the sealing tube, and a multi-stage sealing mechanism is arranged in the flow passage of the sealing tube; the multistage sealing mechanism comprises a plurality of sealing groups and sliding bearings arranged on two sides of the sealing groups, and a plurality of sealing grooves used for mounting sealing rings are arranged at the butt joint positions of the sliding bearings and the sealing pipes.

After adopting above-mentioned technical scheme, through multistage sealing mechanism, the effectual leakproofness that improves whole sealed tube prevents to appear the problem of intaking in each direction, has effectively reduced the sealed problem that the during operation leads to in the pit.

The utility model discloses further set up to: the sliding bearing comprises a first bearing and a second bearing, wherein a guide block is arranged on one side of the bearing of the upper sealing pipe, and the sealing groove is formed among the guide block, the first bearing, the sealing group and the first bearing.

By adopting the technical scheme, one side of the guide block is an inlet section, and the inlet section is an oil extraction section. According to the flow volume formula, the diameter of the inlet part is reduced by the guide block, and the flow speed is larger under the condition that the unit volume is the same, so that the oil extraction efficiency is improved. Meanwhile, the sealing groove is arranged between the guide block and the first bearing, and between the sealing group and the first bearing, so that the problem of sealing performance caused by the increase of the flow speed is effectively prevented.

The utility model discloses further set up to: and a threaded pressing cap is arranged on one side of the second bearing.

After adopting above-mentioned technical scheme, the setting of cap is pressed to the screw thread can play the effect of locking slide bearing and sealed group in export one side, prevents to produce the problem of connecting not fastening at the during operation, utilizes single screw thread to press the cap and can realize the installation of inside seal group and slide bearing, guarantees simultaneously that the sealing washer in the seal groove hugs closely the seal tube inner wall for the leakproofness is strengthened.

The utility model discloses further set up to: and a flow channel on one side of the guide block and a flow channel on one side of the threaded pressing cap are provided with threaded interfaces.

After the technical scheme is adopted, the threaded interface is used for connecting a secondary pipeline or other pipelines and used as a connecting accessory.

The utility model discloses further set up to: a breathing port screen is arranged between the guide block and the threaded interface, and the breathing port screen is provided with a breathing port.

After adopting above-mentioned technical scheme, breathe the mouth screen cloth and play the effect of filtering the impurity in the conveying fluid.

To sum up, the utility model discloses following beneficial purpose has: the application file sealing system, for the necessary system of linear electric motor work needs in the pit, mainly play better sealed effect, prevent that fluid from entering into the joint gap of sealed tube, reduce inside and corrode and can improve oil recovery efficiency.

Drawings

FIG. 1 is a side view of embodiment 1 and embodiment 2;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

fig. 3 is a schematic structural view of the lower sealing device.

Reference numerals: 1. an upper sealing device; 2. a lower sealing device; 3-1, an upper sealing tube; 3-2, a lower sealing tube; 4. a flow channel; 5. a multi-stage sealing mechanism; 51. a sealing group; 52. a sliding bearing; 521. a first bearing; 522. a second bearing; 53. a sealing groove; 6. pressing a cap by screw threads; 7. a breathing port screen; 8. a breathing port; 9. a threaded interface; 10. and (5) guiding the block.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

As shown in fig. 1 and 2, a sealing system of a radial magnetic circuit submersible linear motor comprises an upper sealing device 1 and a lower sealing device 2.

Example 1:

the upper sealing device 1 comprises an upper sealing pipe 3-1. The middle part of the upper sealing pipe 3-1 is provided with a flow passage 4, and the sealing pipe is provided with a multi-stage sealing mechanism 5 for preventing water leakage in all directions in the flow passage 4.

The multistage sealing mechanism 5 includes:

1. a plurality of seal groups 51;

2. and sliding bearings 52 arranged on both sides of the outer edge seal group 51.

For a plurality of seal groups 51:

the sliding bearings 52 on both sides can be divided into a first bearing 521 and a second bearing 522.

The upper sealing tube 3-1 is provided with a guide block 10 at one side of the bearing I521. A sealing groove 53 is arranged between the guide block 10 and the first bearing 521. Meanwhile, the same sealing groove 53 is arranged between the first bearing 521 and the sealing group 51. And a sealing ring is arranged in the sealing groove 53 to ensure the sealing degree.

One side of the second bearing 522 is provided with a threaded press cap 6. The threaded gland 6 is used to secure the seal pack 51 and the slide bearing 52.

Preferably, the two sides of the upper sealing pipe 3-1 are provided with threaded connectors 9. The threaded interface 9 is used for screwing other pipelines.

Example 2:

as shown in fig. 3, the lower sealing device 2 includes a lower sealing tube 3-2. The middle part of the lower sealing pipe 3-2 is provided with a flow passage 4, and the sealing pipe is provided with a multi-stage sealing mechanism 5 for preventing water leakage in all directions in the flow passage 4.

The multistage sealing mechanism 5 includes:

1. a plurality of seal groups 51;

For a plurality of seal groups 51:

The lower sealing tube 3-2 is provided with a guide block 10 at one side of the bearing I521. A sealing groove 53 is arranged between the guide block 10 and the first bearing 521. Meanwhile, the same sealing groove 53 is arranged between the first bearing 521 and the sealing group 51. And a sealing ring is arranged in the sealing groove 53 to ensure the sealing degree.

Preferably, the two sides of the lower sealing pipe 3-2 are provided with threaded connectors 9. The threaded interface 9 is used for screwing other pipelines.

Aiming at the difference with the upper sealing device 1, a breathing hole screen 7 is arranged between the guide block and the threaded interface 9 of the lower sealing tube 3-2. The excircle part of the breathing hole screen 7 is provided with a breathing hole 8.

Aiming at the embodiment 1 and the embodiment 2, the lower sealing pipe 3-2 is arranged at the position close to the wellhead, so the breathing hole screen 7 can play a good role in filtering effect and balancing pressure difference, and the problem of sealing performance is not needed to be worried about. And the lower sealing pipe 3-2 is arranged at a position close to the bottom of the well, so that higher requirements are made on the sealing performance of the lower sealing pipe. In the actual production process, the upper sealing pipe 3-1 is subjected to more complex environmental changes, and the sealing degree grade can be improved according to the actual situation.

Claims

1. A sealing system of a radial magnetic circuit submersible linear motor is characterized in that: the sealing device comprises a sealing tube, wherein a flow passage (4) is arranged in the middle of the sealing tube, and a multi-stage sealing mechanism (5) is arranged in the flow passage (4) of the sealing tube;

the multistage sealing mechanism (5) comprises a plurality of sealing groups (51) and sliding bearings (52) arranged on two sides of the sealing groups (51), and a plurality of sealing grooves (53) used for mounting sealing rings are arranged at the abutting positions of the sliding bearings (52) and sealing pipes.

2. The sealing system of a radial magnetic circuit submersible linear motor according to claim 1, wherein: the sliding bearing (52) comprises a first bearing (521) and a second bearing (522), a guide block is arranged on one side of the first bearing (521) of the sealing tube, and the sealing groove (53) is arranged among the guide block, the first bearing (521), the sealing group (51) and the first bearing (521).

3. The sealing system of a radial magnetic circuit submersible linear motor according to claim 2, wherein: and a threaded pressing cap (6) is arranged on one side of the second bearing (522).

4. The sealing system of a radial magnetic circuit submersible linear motor according to claim 2, wherein: and a threaded interface (9) is arranged between the flow channel (4) at one side of the guide block and the flow channel (4) at one side of the threaded pressing cap (6).

5. A sealing system for a radial magnetic circuit submersible linear motor according to claim 3 or claim 4, wherein: a breathing port screen (7) is arranged between the guide block and the threaded interface (9), and the breathing port screen (7) is provided with a breathing port (8).