A method for judging the leakage of a vacuum pipeline

A technology of vacuum pipelines and pipelines, which is applied in liquid tightness measurement using liquid/vacuum degree, fluid tightness testing, machine/structural component testing, etc. It can solve poor sealing performance, affect passenger safety, and long pipeline and other issues to achieve the effect of improving reliability and safety factor

Active Publication Date: 2020-05-26
张跃
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The vehicles of the vacuum train run at high speed in a vacuum environment. First of all, it is necessary to ensure that the vehicles are in a closed and safe vacuum environment. However, due to the long-distance transportation vacuum pipeline, the route terrain, and the external environment of the area are complex, resulting in uncertain factors for possible leakage of the pipeline. Therefore, how to detect pipeline leakage in real time is the first condition for the safe operation of vacuum trains
[0004] The existing vacuum pipelines mainly have the following defects: (1) The vacuum train runs in a vacuum environment in the vacuum pipeline. At present, the existing pipeline structure has poor sealing performance and cannot ensure a stable and safe vacuum environment inside; (2) the vacuum The shells of the pipelines are all solid structures, on the one hand, the weight is heavy; on the other hand, once leaks, the risk factor will be greatly increased, affecting the safety of passengers, and the sealing performance is poor; (3) the existing vacuum pipelines can perform real-time leak detection but timely Poor performance, when an emergency situation occurs, there is no timely and effective treatment method to remedy or alleviate

Method used

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  • A method for judging the leakage of a vacuum pipeline
  • A method for judging the leakage of a vacuum pipeline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 with figure 2 Shown: a method for judging the leakage of a vacuum pipeline, including a vacuum pipeline 1 composed of a sandwich panel 3, the sandwich panel 3 including an inner panel 32, an outer panel 31, and a sandwich layer 33 between the two ; The pressure of the sandwich layer is between the internal and external pressures. If the pressure sensor detects that the pressure of the sandwich layer 33 becomes larger, it indicates that the layer with strong pressure is leaking; if the pressure of the sandwich layer 33 becomes smaller, it indicates The layer with the lower pressure is leaking.

[0039] Specifically, the vacuum duct 1 is composed of a sandwich panel 3. The sandwich panel 3 is composed of an inner layer, an outer panel, and a sandwich layer 33 located between the two. The thickness of the outer layer and the inner panel of the sandwich panel are equal. The thickness is 300 mm, and the sandwich layer 33 includes a plurality of hollow tubes ar...

Embodiment 2

[0046] With the same structural signs, when the vacuum pipeline is placed 100m underwater, the underwater pressure is 980KPa at this time, and a pressure sensor is set on the vacuum pipeline 1. The inner cavity of the vacuum pipe 1 and the sandwich layer 33 are respectively sealed, and the inner cavity of the vacuum pipe 1 is evacuated first, so that the pressure inside the vacuum pipe 1 reaches P2=0 Pa and remains stable.

[0047] The leakage judgment method of the vacuum pipeline is the same as that in Example 1.

Embodiment 3

[0049] Such as figure 1 with figure 2 Shown: when vacuum pipe 1 contains train 2, vacuum pipe 1 and vacuum train 2 can be tested at the same time, that is, when vacuum pipe 1 is placed under atmospheric pressure, the pressure detection method of vacuum pipe 1 is the same as above. The shell of the train 2 is also composed of sandwich panels 3. When the train 2 is placed in the vacuum pipeline, the outside of the train is in a vacuum state, the external pressure value P2=0Pa, and the inside of the train is standard atmospheric pressure, that is, P4=101KPa. Detect the pressure value in the train sandwich layer. When the pressure value stabilizes at a certain value, such as 10KPa, the threshold range of the calibrated pressure value P is preset in the controller, such as 9.90~10.1 KPa.

[0050] The pressure sensor detects the pressure in the train sandwich layer in real time. If the pressure value in the train sandwich layer is detected P5 min (P min =9.90KPa), it means that ther...

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Abstract

The invention relates to a leakage judging method for a vacuum pipeline. The leakage judging method comprises a pipeline formed by a sandwich board, wherein the sandwich board comprises an inner layer, an outer layer and a sandwich layer arranged between the inner layer and the outer layer; the pressure strength of the sandwich layer is between the internal and external pressure strengths; if thedetected pressure strength of the sandwich layer is increased, the layer with relatively high pressure strength is leaked; and if the detected pressure strength of the sandwich layer is reduced, the layer with relatively low pressure strength is leaked. The invention further discloses another leakage judging method for the vacuum pipeline. According to the leakage judging method, the air leakage position can be accurately and rapidly judged, so that the security coefficient is greatly increased.

Description

Technical field [0001] The invention belongs to the technical field of vacuum pipelines, and in particular relates to a method for determining leakage of vacuum pipelines. Background technique [0002] High-speed vacuum trains have many advantages, such as high speed, low energy consumption, and low resistance. They have a very broad development space and can play an important role in long-distance high-speed transportation in the near future. Vacuum trains run in closed vacuum pipes. Maglev trains are generally used. They are not affected by air resistance, friction and weather. The theoretical speed can reach 1000-6000 km / h, which is several times higher than that of airplanes and consumes more energy than airplanes. Many times lower, this kind of transportation may become the fastest way for humans to travel. [0003] The vehicle of the vacuum train runs at high speed in a vacuum environment. First of all, it is necessary to ensure that the vehicle is in a closed and safe vacuu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/28
CPCG01M3/283
Inventor 张跃
Owner 张跃
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