CN-121972244-A - Microfluidic device for analyzing dissolved gas in insulating oil and control method

Abstract

The application relates to a microfluidic device and a control method for analyzing dissolved gas in insulating oil, wherein the microfluidic device comprises a microfluidic chip and a heating device, the microfluidic chip is provided with an oil sample inlet, a micro-flow channel area and a gas-liquid separation area, the oil sample inlet is communicated with the micro-flow channel area, the micro-flow channel area is communicated with the gas-liquid separation area, a pump cavity for containing fluid is arranged in the micro-flow channel area, the pump cavity is respectively communicated with the oil sample inlet and the gas-liquid separation area, a piezoelectric brake is arranged in the pump cavity and is connected with an elastic pump film of the pump cavity, the heating device is used for heating the micro-flow channel area, the piezoelectric brake and the heating device are integrated on the microfluidic chip, the volume of the microfluidic device is small, and the extraction efficiency is high.

Inventors

• ZHANG LUNJIA
• ZHAO YAQIAN
• TAN DALUN
• RAO XUEKAI
• SHI YANHUI
• LUO BAIFENG
• Zong Zhenxiang
• WEN CHENG

Assignees

• 南方电网传感科技(广东)有限公司

Dates

Publication Date

20260505

Application Date

20260119

Claims (10)

1. 1. A microfluidic device for analysis of dissolved gases in insulating oil, the microfluidic device comprising: The microfluidic chip is provided with an oil sample inlet, a micro-flow channel area and a gas-liquid separation area, wherein the oil sample inlet is communicated with the micro-flow channel area, the micro-flow channel area is communicated with the gas-liquid separation area, a pump cavity for containing fluid is arranged in the micro-flow channel area, the pump cavity is respectively communicated with the oil sample inlet and the gas-liquid separation area, a piezoelectric brake is arranged in the pump cavity, and the piezoelectric brake is connected with an elastic pump membrane of the pump cavity; And the heating device is integrated on the microfluidic chip and is used for heating the micro-channel region.
2. 2. The microfluidic device of claim 1, wherein the microchannel region is further provided with: The oil sample inlet is communicated with the first pipeline through one end of the first pipeline, the pump cavity is communicated with the other end of the first pipeline, the shape of the first pipeline is snake-shaped or spiral, the heating device is used for heating the first pipeline, and the heating device and the first pipeline are integrated into a whole structure through an MEMS process.
3. 3. The microfluidic device of claim 2, wherein the pump chamber is provided with: The first one-way valve is communicated with the first pipeline and is manufactured by the MEMS process; And the second one-way valve is communicated with the gas-liquid separation area and is manufactured by the MEMS process.
4. 4. A microfluidic device according to claim 3, wherein the microchannel region is further provided with: The gas-liquid separation device comprises a first pipeline, a second pipeline, a gas-liquid separation area, a heating device and a MEMS (micro electro mechanical system) process, wherein one end of the first pipeline is communicated with the first check valve, the other end of the first pipeline is communicated with the gas-liquid separation area, the first pipeline is in a serpentine shape or a spiral shape, a herringbone groove or a spiral channel is arranged in the first pipeline, the heating device is used for heating the first pipeline, and the heating device and the first pipeline are integrated into a whole structure through the MEMS process.
5. 5. The microfluidic device of claim 4, wherein the microchannel region is further provided with: the flow speed sensing device is arranged between the second one-way valve and the second pipeline.
6. 6. The microfluidic device of claim 4, wherein the microchannel region is further provided with: And one end of the third pipeline is communicated with the other end of the second pipeline, the other end of the third pipeline is communicated with the gas-liquid separation area, and an air cavity array or a first micro-column array is arranged in the third pipeline.
7. 7. The microfluidic device according to claim 1, wherein the gas-liquid separation region is provided with: The branched channel comprises an inlet, a first outlet and a second outlet, wherein the inlet is communicated with the pump cavity, the first outlet is narrower than the second outlet, and a capillary valve or a second micro-column array is arranged at the first outlet.
8. 8. A control method applied to the microfluidic device of any one of claims 1 to 7, the method comprising: acquiring flow velocity information corresponding to the flow of fluid in the pump cavity out of the pump cavity; and adjusting the working frequency of the piezoelectric brake by adopting a PID closed-loop control algorithm based on the flow rate information.
9. 9. A controller comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of claim 8 when executing the computer program.
10. 10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of claim 8.

Description

Microfluidic device for analyzing dissolved gas in insulating oil and control method Technical Field The application relates to the technical field of chemical analysis, in particular to a microfluidic device for analyzing dissolved gas in insulating oil and a control method. Background In the running process of oil-filled power equipment such as a power transformer, insulating oil and solid insulating materials in the oil-filled power equipment can be gradually aged and decomposed due to factors such as electricity, heat and the like, and various characteristic gases such as hydrogen (H 2), acetylene (C 2H2), methane (CH 4) and the like are generated, and dissolved in the insulating oil, and the changes of components and contents of the gases can accurately reflect the type and severity of latent faults in the equipment. Thus, performing analysis of dissolved gases in oil (Dissolved GAS ANALYSIS, DGA) is a core technology for diagnosing and assessing the health of electrical equipment, however, existing DGA techniques have problems of large device volumes and long extraction times. Disclosure of Invention In view of the above, it is necessary to provide a microfluidic device and a control method for analyzing a dissolved gas in an insulating oil, which have a small device size and a short extraction time. In a first aspect, the present application provides a microfluidic device for analysis of dissolved gases in insulating oil, the microfluidic device comprising: The microfluidic chip is provided with an oil sample inlet, a micro-flow channel area and a gas-liquid separation area, wherein the oil sample inlet is communicated with the micro-flow channel area, the micro-flow channel area is communicated with the gas-liquid separation area, a pump cavity for containing fluid is arranged in the micro-flow channel area, the pump cavity is respectively communicated with the oil sample inlet and the gas-liquid separation area, a piezoelectric brake is arranged in the pump cavity, and the piezoelectric brake is connected with an elastic pump membrane of the pump cavity; And the heating device is integrated on the microfluidic chip and is used for heating the micro-channel area. In one embodiment, the micro flow channel region is further provided with: The device comprises a first pipeline, wherein one end of the first pipeline is communicated with an oil sample inlet, the other end of the first pipeline is communicated with a pump cavity, the shape of the first pipeline is serpentine or spiral, the heating device is used for heating the first pipeline, and the heating device and the first pipeline are integrated into a whole structure through an MEMS process. In one embodiment, the pump chamber is provided with: The first one-way valve is communicated with the first pipeline and is manufactured by MEMS technology; The second one-way valve is communicated with the gas-liquid separation area and is manufactured by MEMS technology. In one embodiment, the micro flow channel region is further provided with: The device comprises a first pipeline, a second pipeline, a gas-liquid separation area, a heating device, a MEMS (micro electro mechanical systems) process and a gas-liquid separation area, wherein one end of the first pipeline is communicated with the first check valve, the other end of the first pipeline is communicated with the gas-liquid separation area, the second pipeline is in a serpentine shape or a spiral shape, a herringbone groove or a spiral channel is arranged in the second pipeline, the heating device is used for heating the first pipeline, and the heating device and the first pipeline are integrated into a whole structure through the MEMS process. In one embodiment, the micro flow channel region is further provided with: The flow speed sensing device is arranged between the second one-way valve and the second pipeline. In one embodiment, the micro flow channel region is further provided with: And one end of the third pipeline is communicated with the other end of the second pipeline, the other end of the third pipeline is communicated with the gas-liquid separation area, and an air cavity array or a first micro-column array is arranged in the third pipeline. In one embodiment, the gas-liquid separation zone is provided with: the branch channel comprises an inlet, a first outlet and a second outlet, wherein the inlet is communicated with the pump cavity, the first outlet is narrower than the second outlet, and a capillary valve or a second micro-column array is arranged at the first outlet. In a second aspect, the present application further provides a control method, which is applied to the microfluidic device, and the method includes: Acquiring flow velocity information corresponding to the flow of the fluid in the pump cavity out of the pump cavity; based on the flow rate information, a PID closed-loop control algorithm is used to adjust the operating frequency of the piezoelectric brake. In a third