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CN-122016448-A - Hydrogen extraction system for instrument for measuring hydrogen content in aluminum alloy

CN122016448ACN 122016448 ACN122016448 ACN 122016448ACN-122016448-A

Abstract

The invention relates to the technical field of hydrogen measurement sensing, in particular to a hydrogen extraction system for an instrument for measuring the hydrogen content in aluminum alloy, which is based on the test characteristics of the hydrogen content in aluminum alloy, combines the test defects in practical application, utilizes infrared light to focus on a sample in a high-temperature resistant quartz sample tube for many times through a gold-plated curved surface of the inner wall mirror surface of a furnace body to fully melt the sample, combines external temperature control software to precisely control the temperature of a gold-plated infrared focusing heating tube, combines negative pressure air circuit design and circulating water cooling control, realizes precise, rapid and stable heating and test data acquisition, combines the requirements of large sample detection and the integration of energy conservation and environmental protection, and plays a comprehensive role in high efficiency, accuracy, reliability, safety and the like for the detection of the hydrogen content in aluminum alloy.

Inventors

  • DUAN LONGWEI
  • DUAN XINGHAN

Assignees

  • 上海景瑞阳实业有限公司

Dates

Publication Date
20260512
Application Date
20260211

Claims (10)

  1. 1. The hydrogen extraction system for the instrument for measuring the hydrogen content in the aluminum alloy comprises an analysis gas outlet joint (1), a precise bearing and fixing frame (6) and a micro-control lifting cylinder (13), and is characterized in that the middle part of the precise bearing and fixing frame (6) is fixedly provided with a total specular reflection hearth consisting of a specular gold-plated infrared reflection focusing heating furnace (8) and high-reflection gold-plated retention temperature protection plates (16) arranged at the upper end and the lower end of the specular gold-plated infrared reflection focusing heating furnace (8), a high-temperature-resistant quartz sample tube (9) made of transparent materials is arranged in the specular gold-plated infrared reflection focusing heating furnace (8) in a non-contact manner, the upper end of the high-temperature-resistant quartz sample tube (9) is in butt joint with a furnace end (3) through a furnace end O-shaped sealing ring (4) and realizes air sealing, the upper end and the outside of the furnace end (3) are respectively provided with the analysis gas outlet joint (1) and the water-cooled condenser (2), the water-cooled condenser (2) is tightly attached to the outer wall of the furnace end (3), a water flow pipeline is arranged in the water-cooled condenser (2) and is externally connected with a cooling water circulator for circularly cooling, a gold-plated infrared focusing heating pipe (15) is arranged outside the high-temperature-resistant quartz sample pipe (9) in a surrounding and non-contact manner, a temperature detector (7) extending into the total specular reflection hearth is arranged at the middle position of the specular gold-plated infrared reflection focusing heating furnace (8), the utility model discloses a high temperature resistant heat dissipation fan, including fixed frame (6) and high temperature resistant quartz sample tube (9), the middle part that just is located of accurate bearing fixed frame (6) is fixed with two gas circuit isolation air inlet joint seat (10) in the below of total specularity reflection furnace, the upper end of two gas circuit isolation air inlet joint seat (10) pass through O type sealing washer (18) with the lower extreme of high temperature resistant quartz sample tube (9) forms sealing connection and realizes the gas circuit integrality, be provided with two opposite directions on two gas circuit isolation air inlet joint seat (10) respectively and with independent gas circuit joint of high temperature resistant quartz sample tube (9) intercommunication, one of independent gas circuit joint is the carrier gas air inlet, and the other way is for being used for the gas isolation protection to prevent the air entering, the bottom below of high temperature resistant quartz sample tube (9) is provided with quartz isolation window (11), the bottom of accurate bearing fixed frame (6) is provided with micro-control formula lift cylinder (13), be provided with in the lower space of accurate bearing fixed frame (6) for the cooling high temperature resistant radiator fan (12) of micro-control formula lift cylinder (21).
  2. 2. The hydrogen extraction system for an instrument for determining the hydrogen content in an aluminum alloy according to claim 1, wherein the number of the gold-plated infrared focusing heating pipes (15) is four and is arranged in a non-contact manner with the mirror gold-plated infrared reflection focusing heating furnace (8).
  3. 3. The hydrogen extraction system for an instrument for determining the hydrogen content in an aluminum alloy according to claim 2, characterized in that the gold-plated infrared focusing heating tube (15) is designed for a directional reflection angle of 54 degrees.
  4. 4. The hydrogen extraction system for an instrument for determining the hydrogen content in an aluminum alloy according to claim 1, wherein the temperature detector (7) is arranged in a contactless manner with the mirror-coated infrared reflection focusing heating furnace (8), the high-temperature-resistant quartz sample tube (9) and the gold-coated infrared focusing heating tube (15), respectively.
  5. 5. The hydrogen extraction system for the instrument for determining the hydrogen content in the aluminum alloy according to claim 1, wherein the quartz isolation window (11) is used for opening and closing a sample pipeline channel at the bottom of the high-temperature-resistant quartz sample tube (9) under the driving of a quartz isolation window driving cylinder (19) arranged below a middle isolation plate of the precise bearing and fixing frame (6).
  6. 6. The hydrogen extraction system for the instrument for determining the hydrogen content in the aluminum alloy according to claim 5, wherein a diffuse reflection photoelectric sensor (20) for monitoring the opening and closing states of the quartz isolation window (11) and judging whether the micro-control lifting cylinder (13) is opened or not is arranged on the quartz isolation window driving cylinder (19).
  7. 7. The hydrogen extraction system for the instrument for determining the hydrogen content in the aluminum alloy according to claim 1, wherein the analysis gas outlet joint (1) and the furnace end (3) are independent modules which are connected in a sealing way through a heat insulation gasket, the outlet of the analysis gas outlet joint (1) is wound around a constant temperature heat tracing belt and is used for constant temperature transportation of gas at 60 ℃ through software precise constant temperature, and the analysis gas outlet joint (1) is connected with an external vacuum pump after being externally connected with a high-sensitivity detector and is used for forming a negative pressure environment inside the high-temperature resistant quartz sample tube (9).
  8. 8. The hydrogen extraction system for an instrument for determining the hydrogen content in an aluminum alloy according to claim 1, characterized in that the lower end of the burner (3) is equipped with a metal sintered dust filter (5), and a 3mm vent hole is provided inside the burner (3) for gas circulation.
  9. 9. The hydrogen extraction system for an instrument for determining the hydrogen content in an aluminium alloy according to claim 1, characterized in that the sample basket (21) is arranged on the shaft of the micro-controlled lifting cylinder (13).
  10. 10. The hydrogen extraction system for the instrument for determining the hydrogen content in the aluminum alloy according to claim 1, wherein an internal integrated cooling circulating water pipeline of the mirror surface gold-plated infrared reflection focusing heating furnace (8) is respectively provided with a circulating system quantitative water inlet (17) and a circulating system quantitative water outlet (14) which are connected with an external cooling water circulating machine.

Description

Hydrogen extraction system for instrument for measuring hydrogen content in aluminum alloy Technical Field The invention relates to the technical field of hydrogen measurement sensing, in particular to a hydrogen extraction system for an instrument for measuring the hydrogen content in aluminum alloy. Background Aluminum alloy has become a lightweight core material in the fields of automobiles, aerospace, ships and the like by virtue of the characteristics of excellent heat conduction and formability. However, in the preparation and processing process, hydrogen is very easy to invade an aluminum alloy matrix and can interact with microstructures such as matrix dislocation, grain boundaries and secondary particles, so that defects such as air holes and looseness are induced, mechanical properties are reduced, service reliability is severely restricted, and therefore, the hydrogen content in the aluminum alloy must be accurately monitored in industrial application. Because the release condition of hydrogen in aluminum alloy is very severe, specific conditions need to be satisfied to rapidly and accurately measure the content of hydrogen: First, it is necessary to set an aluminum alloy solid in an inert gas atmosphere, heat it to a temperature close to the melting point and keep it at a constant temperature, and place the aluminum alloy in a critical state of melting and non-melting. If the temperature exceeds the melting point, the hydrogen atoms are dissolved again in the melt and adsorbed, and cannot be delivered to the detector and detected with the carrier gas. As shown in fig. 1 and 2, when the aluminum alloy used in the experiment was heated to 670 ℃, the hydrogen atoms redissolved in the melt increased doubly, so that the content could not be accurately measured, and the hydrogen solubility suddenly decreased when cooling and solidifying, so that the hydrogen did not overflow to form pores. The method has the advantages that the method is simple in structure, convenient to use, low in cost and convenient to use, and the method is convenient to use, and the hydrogen content in the aluminum alloy is very low, the hydrogen content in the high-strength aluminum alloy for aviation and aerospace is usually less than 0.3 microgram/gram, and the method has two points for effective measures for improving the ultra-low-content hydrogen measurement accuracy, namely, the method is capable of increasing the sample quantity, increasing the absolute hydrogen quantity in the analysis process, improving the signal response value of a detector, improving the signal to noise ratio, simultaneously increasing the weight of a sample, effectively reducing the loss of hydrogen in the sample preparation process, improving the measurement accuracy by the convenient surface adsorption blank and the like, and improving the temperature control accuracy of a hydrogen extraction heating furnace, ensuring that hydrogen overflows rapidly, and being insoluble in the extraction analysis process, thereby improving the measurement accuracy. In addition, the current technology for detecting hydrogen in aluminum alloy mainly adopts a pulse inert gas melting method, namely, a sample is placed in a graphite crucible, high-purity inert carrier gas is introduced, then the high-pressure pulse arc melts the sample at high temperature to release hydrogen, the carrier gas purifies mixed gas to remove impurities, then the mixed gas is sent to a detector, and then the hydrogen content is calculated by combining a calibration curve. However, there are some significant disadvantages to this approach: Firstly, the pulse method adopts control of heating power to realize temperature control, and according to the working principle of a pulse furnace, the pulse furnace controls total input energy by adjusting pulse width and frequency, so that the temperature of a sample is finally stabilized in a target interval, but the temperature is not constant, so that the surface temperature of a heated sample is not necessarily kept unchanged under the condition of stable power, the aluminum alloy is difficult to realize in a molten and non-molten state, and once the sample is molten, part of hydrogen is dissolved in an aluminum alloy liquid, so that a test result is low. If the tested sample is repeatedly tested, there is a secondary release of hydrogen, the test result still has an integral peak of hydrogen, and the release result of hydrogen is far greater than 0, so that the test result has inaccuracy and error. Secondly, because the pulse furnace adopts the positive pressure gas circuit, the sample needs to be put into the sample channel during detection, because the positive pressure gas circuit needs to be kept strictly sealed, if the sample is put into the pulse furnace in the running process of the instrument, air invasion can be caused by the pressure difference between the gas circuit and the outside, and further the detection precision is influenced and