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Load Cells in High Pressure Hydrogen Environment

A load sensor and sensor technology, applied in instruments, measuring devices, electric/magnetic solid deformation measurement, etc., can solve the problem of not having the ability to detect the safety of high-pressure hydrogen systems, lack of high-pressure hydrogen system materials/machine durability testing equipment and Technology and other issues to achieve the effect of reducing zero drift and creep, ensuring accuracy and stability

Active Publication Date: 2016-06-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still urgent problems to be solved in the safety guarantee of high-pressure hydrogen systems in my country: lack of high-pressure hydrogen system materials / machine durability testing equipment and technology, and lack of safety testing capabilities for high-pressure hydrogen systems

Method used

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  • Load Cells in High Pressure Hydrogen Environment
  • Load Cells in High Pressure Hydrogen Environment
  • Load Cells in High Pressure Hydrogen Environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A load sensor in a high-pressure hydrogen environment (such as figure 1 , 2 shown), including the upper sensor case 1, the lower sensor case 2 and the elastic body 3, the elastic body 3 is threadedly connected with the upper sensor case 1 and the lower sensor case 2 respectively, and the middle part of the elastic body 3 is evenly distributed with foil strain gauges 4, elastic There is a piece of foil strain gauge 4 in the middle of each of the four surfaces of the middle part of the body 3, and the foil strain gauges 4 on the front and rear surfaces of the middle part of the elastic body 3 are arranged laterally (refer to the attached image 3 ), the foil strain gauges 4 on the left and right surfaces in the middle of the elastic body 3 are arranged longitudinally, the foil strain gauges 4 are bonded to the elastic body 3, and the foil strain gauges 4 include a sensitive grid 41 and a base 42 (conventional glass Fiber cloth), covering layer 43 (conventional polytetraf...

Embodiment 2

[0033] The difference between this embodiment and Embodiment 1 is that the thickness of the sensitive grid is 15 μm, and the composition of each element of the iron-based alloy in terms of mass percentage is: 20% chromium, 3% nickel, 1% aluminum, and 76% iron; The thickness of the transition layer is 100nm, and the thickness of the aluminum thin layer is 100nm.

[0034] The thickness of the aluminum oxide protective layer is 10nm, and the processing parameters of the plasma oxidation technology are: the frequency of the radio frequency source used is 15MHz, and the power of the radio frequency source is 2W / cm2 , the gas source is a mixed gas mixed with argon and oxygen at a volume ratio of 10:1, the gas flow rate is 49 sccm, and the reaction chamber pressure is 8×10 4 Pa, the sensitive gate temperature is controlled at 250°C, and the oxidation time is 2.5h.

[0035] Others are with embodiment 1.

Embodiment 3

[0037] The difference between this embodiment and Embodiment 1 is that the thickness of the sensitive grid is 8 μm, and the composition of each element of the iron-based alloy in terms of mass percentage is: 15% chromium, 5% nickel, 3% aluminum, and 77% iron; The thickness of the transition layer is 50nm, and the thickness of the aluminum thin layer is 50nm.

[0038] The thickness of the aluminum oxide protective layer is 5nm, and the processing parameters of the plasma oxidation technology are: the frequency of the radio frequency source used is 12MHz, and the power of the radio frequency source is 2W / cm 2 , the gas source is a mixed gas mixed with argon and oxygen at a volume ratio of 7:1, the gas flow rate is 49 sccm, and the reaction chamber pressure is 5×10 4 Pa, the sensitive gate temperature is controlled at 250°C, and the oxidation time is 1.5h.

[0039] Others are with embodiment 1.

[0040] The load sensor of the present invention has a zero drift of ≤100 μm / m and ...

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Abstract

The invention discloses a load sensor in a high-pressure hydrogen environment, which aims to overcome the shortcomings of the existing load sensor itself in a high-pressure hydrogen environment that produces relatively large zero point drift and creep. The invention comprises a sensor upper case, a sensor lower case and an elastic body, the elastic body is threadedly connected with the sensor upper case and the sensor lower case respectively, the middle part of the elastic body is evenly distributed with foil-type strain gauges, the foil-type strain gauges are bonded to the elastic body, and the foil The type strain gauge includes a sensitive grid, a base, a cover layer and a lead-out wire. The sensitive grid is glued between the base and the cover layer by an adhesive, and the lead-out wire is connected to the sensitive grid. The material of the sensitive grid is iron-based alloy. There is a hydrogen permeation barrier film. The invention can effectively reduce zero point drift and creep caused by hydrogen intrusion in a high-pressure hydrogen environment, and ensures the accuracy and stability of measurement results.

Description

technical field [0001] The invention relates to a load sensor, in particular to a load sensor in a high-pressure hydrogen environment. Background technique [0002] Hydrogen is an important industrial raw material. It is widely used in petrochemical industry, electronic industry, metallurgical industry, aerospace and other fields. However, in order to realize the large-scale utilization of hydrogen, there are still many technical problems to be solved. The key problems are safe and efficient hydrogen storage, hydrogen transportation and hydrogenation. Due to the existence of hydrogen embrittlement, the structural materials serving in the high-pressure hydrogen environment will cause material performance degradation and fatigue failure, and lead to serious production accidents. [0003] Therefore, the stress-strain measurement of materials in the hydrogen environment is essential. Among them, resistance strain gauge measurement is the most widely used measurement method. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/22G01B7/16
Inventor 张林占生根周成双陈兴阳
Owner ZHEJIANG UNIV OF TECH
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