System for rapid detection of hydrogen content in molten aluminum

Abstract

The utility model discloses a system of fast detection hydrogen content in aluminium liquid relates to the technical field of aluminium liquid detection, the utility model aims at solving the problem of the hydrogen measurement result error of existing aluminium liquid is bigger, the utility model includes nitrogen gas source, the output of gas source is connected with circulating pump, the output of circulating pump is connected with TCD thermal conductivity sensor, the output of TCD thermal conductivity sensor is connected with detection probe, the detection probe is set below the aluminium liquid liquid level and stretches into, another pipe head of detection probe still with the input of circulating pump is connected, to be used for forming circulating loop.

Description

Technical Field

[0001] This utility model relates to the technical field of aluminum liquid detection, specifically to a system for rapidly detecting the hydrogen content in aluminum liquid. Background Technology

[0002] The amount of hydrogen in molten aluminum is an important indicator of the quality of aluminum alloys and has a significant impact on the internal quality of subsequent castings.

[0003] During the melting process of aluminum alloys, liquid aluminum reacts with water molecules to generate hydrogen gas, which dissolves into the molten aluminum. This hydrogen gas, during the solidification process, can cause defects in the casting, such as pinholes and shrinkage cavities. Therefore, before casting, the hydrogen content in the molten aluminum needs to be strictly tested. There are many existing methods for testing hydrogen content, one of which is the first bubble method. This method involves reducing the system pressure to allow hydrogen to escape from the molten aluminum, and then calculating the hydrogen content based on the system pressure and temperature at the time of the first bubble's escape. However, this method is highly unpredictable, leading to inaccurate results and affecting the quality of the molten aluminum, which in turn affects the quality of the aluminum castings. Utility Model Content

[0004] To address the aforementioned problem of significant errors in existing hydrogen measurement results for molten aluminum, this invention proposes a system for rapidly detecting hydrogen content in molten aluminum. The system includes a nitrogen gas source, the output of which is connected to a circulation pump. The output of the circulation pump is connected to a TCD thermal conductivity sensor, and the output of the TCD sensor is connected to a detection probe. The detection probe extends below the surface of the molten aluminum, and another end of the probe is connected to the input of the circulation pump to form a circulation loop.

[0005] A further feature of this invention is that the output end of the circulation pump is connected to the detection probe via an output pipe, the TCD thermal conductivity sensor is mounted on the output pipe, the other end of the detection probe is connected to the input end of the circulation pump via a circulation pipe, the gas source is connected to the circulation pipe via a gas supply pipe, and a valve is installed on the gas supply pipe.

[0006] This invention also proposes a system for rapidly detecting hydrogen content in molten aluminum, comprising a nitrogen gas source and a circulation pump. The output end of the circulation pump is connected to an output pipe, which extends below the surface of the molten aluminum. A TCD thermal conductivity sensor is installed on the output pipe. The input end of the circulation pump is connected to a porous cover through the circulation pipe. The porous cover is also positioned below the surface of the molten aluminum, with its opening facing downwards. One end of the output pipe, located within the molten aluminum, is positioned below the porous cover. The gas source is connected to the circulation pipe through a gas supply pipe.

[0007] A further feature of this invention is that it includes a computer processor, which is electrically connected to a temperature probe that extends below the surface of the molten aluminum. The TCD thermal conductivity sensor is also electrically connected to the computer processor.

[0008] The beneficial effects of this utility model are as follows:

[0009] 1. By combining a circulation pump with a detection probe, nitrogen gas can circulate within the probe. Since the probe is placed in molten aluminum, when nitrogen gas flows through it, hydrogen gas in the molten aluminum diffuses into the nitrogen gas bubbles and mixes with the nitrogen. The circulation pump then sends the nitrogen-hydrogen mixture into the TCD thermal conductivity sensor. The TCD thermal conductivity sensor can detect the hydrogen concentration based on the different thermal conductivities of nitrogen and hydrogen, thus achieving a faster and more accurate detection process.

[0010] 2. By setting up a porous cover, the nitrogen gas ejected from the output pipe can directly generate nitrogen bubbles in the molten aluminum, and the bubbles can be trapped inside the porous cover and sent back to the circulation pump by the circulation pipe. In this way, the nitrogen bubbles can appear directly in the molten aluminum, which further allows the hydrogen gas in the molten aluminum to diffuse better into the nitrogen bubbles, making the detection results more accurate. Attached Figure Description

[0011] Figure 1 A schematic diagram of the structure of Embodiment 1 is shown.

[0012] Figure 2 A schematic diagram of the structure of Embodiment 2 is shown.

[0013] Reference numerals: 1. Gas source; 2. Circulation pump; 3. Output pipe; 31. TCD thermal conductivity sensor; 4. Detection probe; 5. Circulation pipe; 6. Gas supply pipe; 61. Valve; 7. Computer processor; 8. Temperature probe; 9. Porous cover. Detailed Implementation

[0014] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0015] Example 1

[0016] This invention proposes a system for rapidly detecting the hydrogen content in molten aluminum, comprising a nitrogen source 1 containing 99.999% nitrogen gas, a circulation pump 2, an output pipe 3 connected to the output end of the circulation pump 2, a detection probe 4 connected to the other end of the output pipe 3, the detection probe 4 being inserted below the surface of the molten aluminum, and a circulation pipe 5 connected to the other end of the detection probe 4, the other end of the circulation pipe 5 being connected to the input end of the circulation pump 2 to form a circulation loop.

[0017] The output end of gas source 1 is connected to circulation pipe 5 through gas supply pipe 6, which is used to supply nitrogen gas to circulation pump 2. A TCD thermal conductivity sensor 31 is installed on the output pipe 3. The TCD thermal conductivity sensor 31 is model GC-4100-TCD and can be used to detect gas concentration.

[0018] A valve 61 is installed on the gas supply pipe 6. The valve 61 is an electromagnetic valve. The valve 61 is used to control the opening and closing of the gas supply pipe 6, thereby controlling the connection or disconnection between the gas source 1 and the circulation pump 2.

[0019] It should be noted that, in order to avoid gas backflow in the circulation pipe 5 when supplying nitrogen, a one-way valve can be installed on the circulation pipe 5, that is, the one-way valve is set upstream of the gas supply pipe 6.

[0020] It also includes a computer processor 7, which is a PLC programmable controller. The input terminal of the computer processor 7 is electrically connected to a temperature probe 8, which is also inserted below the surface of the molten aluminum. The temperature probe 8 can be used to detect the temperature of the molten aluminum and then transmit the temperature signal of the molten aluminum to the computer processor 7.

[0021] The TCD thermal conductivity sensor 31 is also electrically connected to the computer processor 7 to transmit the detected hydrogen concentration signal to the computer processor 7, enabling the computer processor 7 to calculate the hydrogen content of the molten aluminum under different conditions based on the temperature signal and the hydrogen signal. This makes the detection process faster and the detection results more accurate, further improving the quality of aluminum castings.

[0022] During testing, a certain amount of nitrogen is introduced into the system through gas source 1. Then, the nitrogen is blown into the detection probe 4 in the aluminum liquid by circulation pump 2. The nitrogen generates nitrogen bubbles in the detection probe 4 and comes into contact with the aluminum liquid. At this time, hydrogen in the aluminum liquid diffuses into the nitrogen bubbles and circulates back into circulation pump 2 with the nitrogen. Then, circulation pump 2 blows the mixture into the inlet / outlet pipe 3. Since a TCD thermal conductivity sensor 31 is installed on the outlet pipe 3, when the mixture of nitrogen and hydrogen is blown into the TCD thermal conductivity sensor 31, the TCD thermal conductivity sensor 31 can detect the hydrogen content and transmit the detected hydrogen concentration signal to the computer processor 7 to obtain the hydrogen concentration value.

[0023] It should be noted that the circulating system also needs to be connected to the purge line, that is, the purge line is connected to the circulating pump 2. Initially, the circulating pump 2 blows nitrogen into the output pipe 3. As nitrogen is continuously injected, it can continuously push the air in the output pipe 3 until the air in the output pipe 3 is replaced by nitrogen. Similarly, as nitrogen is filled in, when nitrogen enters the circulating pipe 5, it can also replace the air in the circulating pipe 5. During the replacement process, the purge line needs to be opened to release the air in the system.

[0024] It should also be noted that the detection probe 4 needs to be inserted 5-8cm below the surface of the molten aluminum.

[0025] Example 2

[0026] The difference between this embodiment and Embodiment 1 lies only in that: it includes a nitrogen gas source 1 and a circulation pump 2. The output end of the circulation pump 2 is connected to an output pipe 3, which extends below the surface of the molten aluminum. A TCD thermal conductivity sensor 31 is installed on the output pipe 3. The input end of the circulation pump 2 is connected to a porous cover 9 through a circulation pipe 5. The porous cover 9 also extends below the surface of the molten aluminum, with the end of the output pipe 3 located inside the molten aluminum positioned below the porous cover 9. This allows the nitrogen bubbles blown into the molten aluminum by the output pipe 3 to be trapped within the holes of the porous cover 9 and then circulated out through the circulation pipe 5. This allows the nitrogen bubbles to be directly exposed in the molten aluminum, avoiding interference between the detection probe 4 and the nitrogen bubbles, ensuring complete contact between the nitrogen bubbles and the molten aluminum, and further allowing hydrogen in the molten aluminum to diffuse better into the nitrogen bubbles.

[0027] In summary, this invention, through the cooperation of the circulation pump 2 and the detection probe 4, enables nitrogen gas to circulate within the detection probe 4. Since the detection probe 4 is placed in molten aluminum, when nitrogen gas flows through the detection probe 4, hydrogen gas in the molten aluminum diffuses into the nitrogen gas bubbles and mixes with the nitrogen gas. The circulation pump 2 then sends the nitrogen and hydrogen gas mixture into the TCD thermal conductivity sensor 31. The TCD thermal conductivity sensor 31 can detect the concentration of hydrogen gas based on the different thermal conductivity of nitrogen and hydrogen gas, thereby achieving a faster detection process and greater accuracy.

[0028] By setting up the porous cover 9, the nitrogen gas ejected from the output pipe 3 can directly generate nitrogen bubbles in the aluminum liquid, and the bubbles can be covered inside the porous cover 9 and sent back to the circulation pump 2 by the circulation pipe 5. In this way, the nitrogen bubbles can appear directly in the aluminum liquid, and further, the hydrogen gas in the aluminum liquid can diffuse better into the nitrogen bubbles, making the detection results more accurate.

[0029] Although the present invention has been described with reference to preferred embodiments, various modifications can be made to it and components can be replaced with equivalents without departing from the scope of the present invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0030] In the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0033] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A system for rapid detection of hydrogen content in molten aluminum, characterized in that: It includes a nitrogen gas source (1), the output end of which is connected to a circulation pump (2), the output end of which is connected to a TCD thermal conductivity sensor (31), the output end of which is connected to a detection probe (4), the detection probe (4) is inserted below the surface of the aluminum liquid, and another tube of the detection probe (4) is also connected to the input end of the circulation pump (2) to form a circulation loop.

2. The system for rapidly detecting hydrogen content in molten aluminum according to claim 1, characterized by: The output end of the circulating pump (2) is connected to the detection probe (4) through the output pipe (3). The TCD thermal conductivity sensor (31) is installed on the output pipe (3). The other end of the detection probe (4) is connected to the input end of the circulating pump (2) through the circulating pipe (5). The gas source (1) is connected to the circulating pipe (5) through the gas supply pipe (6), and a valve (61) is installed on the gas supply pipe (6).

3. A system for rapid detection of hydrogen content in molten aluminum, characterized by: It includes a nitrogen gas source (1) and a circulation pump (2). The output end of the circulation pump (2) is connected to an output pipe (3). The output pipe (3) extends below the surface of the molten aluminum. A TCD thermal conductivity sensor (31) is installed on the output pipe (3). The input end of the circulation pump (2) is connected to a porous cover (9) through a circulation pipe (5). The porous cover (9) is also located below the surface of the molten aluminum, and the opening of the porous cover (9) faces downward. One end of the output pipe (3) is located in the molten aluminum and is located below the porous cover (9). The gas source (1) is connected to the circulation pipe (5) through a gas supply pipe (6).

4. The system for rapid detection of hydrogen content in molten aluminum according to claim 1 or 3, characterized in that: It also includes a computer processor (7), which is electrically connected to a temperature probe (8) that extends below the surface of the molten aluminum. The TCD thermal conductivity sensor (31) is also electrically connected to the computer processor (7).

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