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A Multi-level Redundant Main Shaft Sealing Method

A main shaft sealing and redundant technology, which is applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve the problems of abnormal and stable operation of the motor, leakage of thin motor oil, and easy damage of the seal, so as to ensure long-term stable operation , Increase sealing reliability and prevent damage

Active Publication Date: 2017-10-13
DONGFANG ELECTRIC MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The integrated submersible motor with a sealing device disclosed in this patent document is equipped with a sealing head on the upper end of the motor, directly connects with the submersible pump through the sealing head, and assembles a mechanical seal on the sealing head to meet the sealing requirements of the submersible motor. A single mechanical seal is easily damaged under the action of high temperature, high pressure and external multi-phase mixed liquid, resulting in the leakage of thin oil inside the motor, and at the same time, the external multi-phase liquid enters the inside of the motor and damages the motor, resulting in abnormal stability of the motor Work

Method used

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  • A Multi-level Redundant Main Shaft Sealing Method
  • A Multi-level Redundant Main Shaft Sealing Method
  • A Multi-level Redundant Main Shaft Sealing Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] see figure 1 , a multi-stage redundant main shaft sealing method, the main shaft 2 is provided with a seal seat 1 in contact with the external medium chamber 20, an axial hole 7 is opened in the seal seat 1, and the axial hole 7 communicates with the internal oil chamber 21; Install a one-way valve 8 in the axial hole 7, insert a sealing ring 3 in the sealing seat 1 to form an annular transition chamber 4; connect the annular transition chamber 4 and the axial hole 7, and pass through the one-way valve 8 in the axial hole 7 Move axially to adjust the pressure difference between the annular transition chamber 4 and the inner oil chamber 21 .

[0043] This embodiment is the most basic implementation. A seal seat in contact with the external medium chamber is arranged on the main shaft, and an axial hole is opened in the seal seat, and the axial hole communicates with the internal oil chamber; a check valve is installed in the axial hole. , a sealing ring is embedded in t...

Embodiment 2

[0045] see figure 2 and image 3 , a multi-stage redundant main shaft sealing method, the main shaft 2 is provided with a seal seat 1 in contact with the external medium chamber 20, an axial hole 7 is opened in the seal seat 1, and the axial hole 7 communicates with the internal oil chamber 21; Install a one-way valve 8 in the axial hole 7, insert a sealing ring 3 in the sealing seat 1 to form an annular transition chamber 4; connect the annular transition chamber 4 and the axial hole 7, and pass through the one-way valve 8 in the axial hole 7 Move axially to adjust the pressure difference between the annular transition chamber 4 and the inner oil chamber 21 .

[0046] At least two sealing rings 3 are embedded in the sealing seat 1, an annular transition cavity 4 is formed between the sealing seat 1, the main shaft 2 and two adjacent sealing rings 3, the annular transition cavity 4 is filled with grease, and the annular transition There is a radial hole 5 on the cavity 4, a...

Embodiment 3

[0051] see Figure 4 and Figure 5 , a multi-stage redundant main shaft sealing method, the main shaft 2 is provided with a seal seat 1 in contact with the external medium chamber 20, an axial hole 7 is opened in the seal seat 1, and the axial hole 7 communicates with the internal oil chamber 21; Install a one-way valve 8 in the axial hole 7, insert a sealing ring 3 in the sealing seat 1 to form an annular transition chamber 4; connect the annular transition chamber 4 and the axial hole 7, and pass through the one-way valve 8 in the axial hole 7 Move axially to adjust the pressure difference between the annular transition chamber 4 and the inner oil chamber 21 .

[0052] At least two sealing rings 3 are embedded in the sealing seat 1, an annular transition cavity 4 is formed between the sealing seat 1, the main shaft 2 and two adjacent sealing rings 3, the annular transition cavity 4 is filled with grease, and the annular transition There is a radial hole 5 on the cavity 4, ...

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Abstract

The invention discloses a multilevel-redundancy main shaft sealing method and belongs to the technical field of motor equipment. The multilevel-redundancy main shaft sealing method is characterized in by comprising the following steps: arranging a sealing seat in contact with an external medium cavity on a main shaft, forming an axial hole in the sealing seat and communicating the axial hole with an internal oil cavity; mounting a one-way valve in the axial hole and embedding a seal ring into the sealing seat to form an annular transition cavity; communicating the annular transition cavity with the axial hole, and adjusting pressure difference between the annular transition cavity and the internal oil cavity through axial movement of the one-way valve in the axial hole. Through the multilevel-redundancy main shaft sealing method, at least two-level redundancy sealing is matched with one-way oil permeability and mobility of the one-way valve, so that the pressure difference applied to the seal ring can be reduced; the sealing reliability is improved; the multilevel-redundancy main shaft sealing method is capable of preventing the dilute oil leakage in the motor and the external multiphase liquid from entering the motor, thereby guaranteeing long-term stable operation of the motor.

Description

technical field [0001] The invention relates to the technical field of motor equipment, in particular to a multi-stage redundant main shaft sealing method suitable for downhole motors and deep sea motors. Background technique [0002] High temperature or high pressure environment refers to a pure high temperature or high pressure environment, or an environment with both high temperature and high pressure, such as the working environment of downhole motors, deep sea motors and other motors. Motors working in high-temperature or high-pressure environments not only have to withstand the effects of external high temperature and high pressure, but also the influence of external media on the motor cannot be ignored. Under normal conditions, the medium outside this type of motor is a multiphase mixed liquid, including solid phase, liquid phase and gas phase. The internal medium of the motor is usually a thin oil medium. Therefore, how to prevent the external medium at the rotating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16J15/16
CPCF16J15/162F16J15/166
Inventor 林坤孙立宾李少斌李彬
Owner DONGFANG ELECTRIC MACHINERY
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