CN-224218263-U - Submersible linear motor with pressure balancer

CN224218263UCN 224218263 UCN224218263 UCN 224218263UCN-224218263-U

Abstract

The utility model discloses an oil-submersible linear motor with a pressure balancer, which comprises a stator and a rotor, wherein the stator is arranged in an inner cavity of the stator, and the rotor moves linearly along the stator; the balance capsule is used for dividing the pressure balancer cavity into a pressure balancer inner cavity and a pressure balancer outer cavity, the pressure balancer inner cavity is communicated with the oil guide groove, the pressure balancer outer cavity is communicated with the external environment, and the two sealed ends of the balance capsule are sealed and fixed in the submersible motor.

Inventors

ZENG CHUN
WANG HONGJI
ZHU LIYAN
REN KE
WEN FENGYU

Assignees

湖南中车尚驱电气有限公司

Dates

Publication Date: 20260508
Application Date: 20250428

Claims (10)

1. The submersible linear motor with the pressure balancer comprises a stator and a rotor which linearly moves along the stator, and is characterized in that the submersible linear motor is further provided with the pressure balancer, the pressure balancer comprises a balancing capsule, an oil guide groove and a pressure balancer cavity, the balancing capsule divides the pressure balancer cavity into a pressure balancer inner cavity and a pressure balancer outer cavity, the pressure balancer inner cavity is communicated with the oil guide groove, the pressure balancer outer cavity is communicated with the external environment, and the two sealed ends of the balancing capsule are fixed inside the submersible motor in a sealing mode.
2. The submersible linear motor with the pressure balancer as set forth in claim 1, wherein the stator cavity is defined by a stator inner cylinder, a stator outer cylinder, a motor upper joint and a motor lower joint in a sealing connection manner, and the stator comprises a stator core arranged in the stator cavity.
3. The submersible linear motor with a pressure balancer as recited in claim 2, wherein the stator outer cylinder is provided with a communication hole communicated with the pressure balancer outer cavity.
4. The submersible linear motor with the pressure balancer as set forth in claim 1, wherein insulating oil is filled in the inner cavity of the stator.
5. The submersible linear motor with the pressure balancer of claim 1, wherein the rotor comprises a magnetic shaft, and a rotor magnetic ring and a rotor magnetic steel which are sleeved on the magnetic shaft.
6. The submersible linear motor with the pressure balancer as set forth in claim 1, wherein the oil guide groove is communicated with the inner cavity of the stator.
7. The submersible linear motor with the pressure balancer as set forth in claim 1, wherein the balancing capsule is made of high-weather-resistance rubber.
8. The submersible linear motor with the pressure balancer as set forth in claim 1, wherein the pressure balancer is arranged at a motor lower joint of the submersible motor.
9. The submersible linear motor with the pressure balancer as set forth in claim 1, wherein the pressure balancer is arranged on an upper motor joint of the submersible motor.
10. The submersible linear motor with a pressure balancer as recited in claim 1, wherein the pressure balancer is disposed inside a motor stator of the submersible motor.

Description

Submersible linear motor with pressure balancer Technical Field The utility model relates to the field of submersible linear motors, in particular to a submersible linear motor with a pressure balancer. Background The submersible linear motor is a power device of petroleum and natural gas artificial lifting equipment, is submerged into an oil layer, and directly drives a plunger pump by utilizing the operation characteristic of reciprocating motion of the submersible linear motor along the linear direction, so as to realize well liquid lifting. The operation environment of the submersible linear motor is in an oil layer under the petroleum well, and often needs to go deep into thousands of meters below the ground, the environmental pressure is huge, the components of well liquid are complex, and various corrosive substances are contained in oil, water and gas, so that the protection of the motor is very challenging. In order to avoid the damage of the stator sealing structure caused by huge internal and external pressure difference, the prior art utilizes the characteristic that liquid is difficult to compress, and fills insulating liquid into the inner cavity of the stator, but the problem that the internal and external environmental pressure of the motor is unequal cannot be solved. Considering that the insulating liquid has a larger thermal expansion coefficient than the rigid structure of the motor, in order to avoid the expansion of the insulating liquid and the damage of the sealing structure caused by the heating of the motor and the underground ambient temperature, the insulating liquid needs to be poured under the condition of predicting the highest running temperature of the motor, and finally, the inner cavity of the motor forms negative pressure and a part of vacuum environment is reserved. However, in actual operation, the motor temperature does not reach the expected highest temperature, and even if the motor temperature reaches the expected highest temperature for a short time, the motor is unlikely to be stabilized at the expected highest temperature for a long time, so that the inner cavity of the motor is always in a negative pressure state. Therefore, the sealing structure of the motor is always under the condition of huge pressure difference between the inside and the outside, the phenomenon of microcracks is easy to appear under the vibration and the impact of long-term operation, and well liquid permeates into the motor from the outside of the motor through microcracks under the condition of huge pressure difference, so that the insulating environment in the motor is polluted, and finally the insulation failure of the motor is caused. The utility model CN208416890U discloses a reciprocating oil pumping device driven by a submersible linear motor with balanced engine oil cavity pressure, which comprises a discharge valve, an oil inlet connector, a pump barrel, a plunger, a cable plug-in type motor head, a spacer sleeve, an isolation pipe, a motor rotor, a motor stator, a protection pipe, a motor outer pipe, a motor lower connector and a balance capsule, wherein the protection pipe is provided with a balance hole, the balance capsule is sleeved outside the protection pipe, the two ends of the balance capsule are kept sealed with the protection pipe, the balance capsule covers the balance hole, a balance cavity is formed between the balance capsule and the protection pipe, the pressure of motor oil in an upper annular cavity and a lower annular cavity is equal to the pressure in the motor lower connector, the pressure in the motor is adjusted by communicating the balance capsule through a gap between the stators in the scheme, and because the gap between the rotors is small, the well liquid is extruded into or extruded out of the gap of the movable stator at the section of the balance cavity in the operation process, so that the balance capsule is extremely frequently fluctuated, and the service life of the submersible linear motor is extremely easy to be damaged. Disclosure of utility model The utility model provides an oil-submersible linear motor with a pressure balancer for solving the problems in the prior art. The technical scheme adopted by the utility model is as follows: The submersible linear motor with the pressure balancer comprises a stator and a rotor which linearly moves along the stator, wherein the stator is arranged in an inner cavity of the stator, the submersible linear motor is further provided with the pressure balancer, the pressure balancer comprises a balancing capsule, an oil guide groove and a pressure balancer cavity, the balancing capsule divides the pressure balancer cavity into an inner cavity of the pressure balancer and an outer cavity of the pressure balancer, the inner cavity of the pressure balancer is communicated with the oil guide groove, the outer cavity of the pressure balancer is communicated with the external environment, and the two sealed ends