CN-122016915-A - Bracelet type hydrogen detection device and detection method

CN122016915ACN 122016915 ACN122016915 ACN 122016915ACN-122016915-A

Abstract

The application relates to the technical field of hydrogen detection, and provides a bracelet type hydrogen detection device and a detection method, the device comprises a bracelet housing and a flexible circuit board arranged in the housing, wherein the flexible circuit board is provided with a rigid patch area. The miniature thermal conductivity detector and the knudsen pump are both mounted on the rigid patch and electrically connected for detecting hydrogen concentration and actively pumping gas, respectively. The connecting member is made of flexible heat insulation material and is connected between the pump and the detector for communicating the gas path and thermal insulation. The alarm module is arranged on the flexible circuit board and used for alarming when the concentration exceeds the threshold value. The device integrates the miniature thermal conductivity detector, the knudsen pump and the connecting component on the bracelet, and all the components work cooperatively, so that the technical problems that the stability of a gas flow path of a detection unit, the environmental anti-interference performance and the long-term mechanical reliability of the whole structure are difficult to ensure simultaneously under the dynamic bending working condition when the hydrogen detection function is integrated on the bracelet type equipment are solved.

Inventors

ZHANG YAN
YAN YUTAO
LI HUIYUAN

Assignees

武汉理工大学

Dates

Publication Date: 20260512
Application Date: 20260302

Claims (10)

1. Bracelet formula hydrogen detection device, characterized by includes: A bracelet housing; The flexible circuit board is arranged in the bracelet shell, and a rigid patch area is arranged on the flexible circuit board; the micro thermal conductivity detector is arranged on the rigid patch area of the flexible circuit board and is electrically connected with the flexible circuit board for detecting the concentration of hydrogen; the knudsen pump is arranged on the rigid patch area of the flexible circuit board, is electrically connected with the flexible circuit board and is used for actively pumping the ambient gas to the micro thermal conductivity detector; the connecting component is made of a flexible heat insulation material, is connected between the air outlet of the knudsen pump and the air inlet of the miniature thermal conductivity detector, and is used for communicating an air path and providing thermal insulation; and the alarm module is arranged on the flexible circuit board, is electrically connected with the flexible circuit board and is used for giving an alarm when the hydrogen concentration reaches a threshold value.
2. The bracelet-type hydrogen detection apparatus according to claim 1, wherein the knudsen pump comprises: the pump body is provided with an air inlet and an air outlet; the heat dissipation piece is arranged on one side of the pump body corresponding to the air inlet in a bonding way; The pumping functional layer is arranged in the pump body and positioned on the gas flow passage between the gas inlet and the gas outlet; the heating element is arranged in the pump body and is electrically connected with the flexible circuit board; The heating element is used for heating the pumping functional layer, and is matched with the heat dissipation piece to form a temperature gradient on two sides of the pumping functional layer so as to drive gas to flow from the gas inlet to the gas outlet.
3. The bracelet-type hydrogen detection device according to claim 2, wherein the pump body further comprises a first glass chip, a second glass chip and a third glass chip which are stacked, micro flow channels are etched in the first glass chip, the second glass chip and the third glass chip, the micro flow channels jointly form a gas flow channel from the gas inlet to the gas outlet, the pumping functional layer is bonded between the first glass chip and the second glass chip, and the heating element is fixedly arranged between the second glass chip and the third glass chip.
4. The device for detecting bracelet hydrogen according to claim 2 or3, wherein the Knusen pump further comprises an air inlet pipe, one end of the air inlet pipe penetrates through the heat dissipation piece and is connected with the air inlet on the pump body, the other end of the air inlet pipe extends to the outside of the bracelet shell, and a primary coarse filter screen and a secondary fine filter screen are sequentially arranged in the air inlet pipe along the air inlet direction.
5. The bracelet-type hydrogen detection device according to claim 3, wherein the pumping function layer is an integral porous silicon structure with nanoscale through-channels bonded between the first glass chip and the second glass chip, the nanoscale through-channels forming part of the gas flow channel.
6. The bracelet-type hydrogen detection device according to claim 1, wherein the connecting member comprises: The connecting body is made of a flexible heat insulation material; A first flow passage and a second flow passage formed in the connecting body, an inlet of the first flow passage being used for connecting an air outlet of the knudsen pump, an outlet of the second flow passage being used for connecting an air inlet of the micro thermal conductivity detector, and And the flexible microtube is embedded in the connecting body and is used for communicating the first flow passage with the second flow passage.
7. The bracelet-type hydrogen detection device according to claim 6, wherein the micro thermal conductivity detector comprises: The packaging shell is provided with an air inlet and an air outlet, and the air inlet of the packaging shell is in fluid communication with the air outlet of the knudsen pump through the connecting component; the reference pool is hermetically arranged in the packaging shell and filled with reference gas; A detection tank arranged in the packaging shell and communicated with the second flow passage outlet of the connecting member, and And the two thermistors are respectively arranged in the reference tank and the detection tank, and are used for being connected with a Wheatstone bridge circuit so as to detect the change of the thermal conductivity of the gas in the detection tank.
8. The bracelet-type hydrogen detection device of claim 7, wherein the reference gas filled in the reference cell is pure air.
9. The bracelet-type hydrogen detection device according to claim 1, wherein the flexible circuit board has a structure of combining a flexible PCB substrate and a local rigid patch, and a microcontroller and a signal conditioning module are integrated on the flexible circuit board, and the microcontroller and the signal conditioning module are used for processing signals of the micro thermal conductivity detector and controlling the alarm module and the knudsen pump; The alarm module comprises a micro flat vibration motor, a micro patch buzzer and a patch LED, wherein the micro patch buzzer and the micro flat vibration motor are arranged on the rigid patch, and the patch LED is arranged in a flexible area of the flexible PCB substrate.
10. A detection method using the bracelet-type hydrogen detection apparatus according to claim 7 or 8, characterized by comprising the steps of: Starting the knudsen pump and the micro thermal conductivity detector, and pumping ambient gas into the detection cell through the knudsen pump; Performing initial calibration on the micro thermal conductivity detector to eliminate a Wheatstone bridge bias voltage caused by the initial component difference of the reference gas and the ambient gas; Continuously pumping ambient gas into the detection cell through the knudsen pump, and detecting the change of the thermal conductivity of the gas in the detection cell through the micro thermal conductivity detector; And controlling the alarm module to send out an alarm when the change of the thermal conductivity indicates that the concentration of the hydrogen in the environment reaches or exceeds a preset concentration threshold value.

Description

Bracelet type hydrogen detection device and detection method Technical Field The application relates to the technical field of hydrogen detection, in particular to a bracelet type hydrogen detection device and a detection method. Background In the context of rapid development of the hydrogen energy industry, hydrogen is used as a high-efficiency clean energy source, and the safety problem of the whole industrial chain is increasingly emphasized. Hydrogen has an extremely wide explosion limit range and extremely low ignition energy, and once leakage occurs, combustion or explosion is extremely easy to initiate. Therefore, the real-time and reliable monitoring of hydrogen leakage is a key for guaranteeing the safe operation of related industries. However, currently mainstream hydrogen detection technologies, from application form to core principle, still face a series of challenges when moving towards portable, wearable, highly reliable monitoring needs. In terms of application forms, existing hydrogen gas detection devices are mainly classified into stationary, portable and mobile types. The fixed device can realize 24-hour continuous monitoring, but has the advantages of complex installation and construction, high initial construction cost, fixed coverage range and difficult adaptation to temporary operation or dynamically-changed station environments. Although the flexibility of the portable equipment is improved, commercial products on the market are mostly handheld at present, and the portable equipment needs to occupy single-hand operation of a user in actual work, so that all-weather close-fitting monitoring cannot be achieved, and new potential safety hazards can be introduced due to influence on operation. Mobile equipment using a vehicle as a carrier has problems such as high cost and large terrain restriction, and is difficult to popularize as personal protective equipment. In the core detection principle, the sensors widely used at present are mainly based on chemical reactions between gases and sensitive materials, and have inherent limitations. For example, electrochemical sensors typically have a narrow detection range and are prone to saturation failure in high concentration hydrogen environments, semiconductor sensors need to operate at high temperatures, which accelerates material aging, resulting in shorter service lives, while catalytic combustion sensors are highly dependent on oxygen environments, are not operable in anaerobic conditions, and present a risk of catalyst poisoning or even burnout in high concentration hydrogen. These sensors based on chemical principles have bottlenecks in pursuing long life, wide range and high safety. Still further, the prior art faces a fundamental integration challenge when attempting to miniaturize and integrate hydrogen detection functionality into wearable devices such as hand rings. Conventional high-precision gas detection typically relies on a detection unit that requires a stable gas flow environment and constant temperature operation, and an auxiliary system for providing a stable gas flow thereto. However, under the dynamic bending working condition that the wrist frequently moves, how to construct a stable, airtight and anti-interference gas flow path and environment for the detection unit in an extremely miniaturized space, and ensure that the whole integrated structure keeps reliable functions under long-term mechanical deformation is a difficult obstacle for the prior art scheme to overcome. This contradiction severely restricts the development of a truly reliable hydrogen detection wearable device suitable for long-term on-body monitoring. Disclosure of Invention In view of this, the application provides a bracelet-type hydrogen detection device and a detection method, which are used for solving the technical problems that when a hydrogen detection function is integrated into a bracelet-type wearable device, the stability of a gas flow path of a detection unit, the environmental anti-interference performance and the long-term mechanical reliability of an integral structure are difficult to ensure simultaneously under a dynamic bending working condition. The technical scheme of the application is realized as follows: in a first aspect, the present application provides a bracelet-type hydrogen detection apparatus comprising: A bracelet housing; The flexible circuit board is arranged in the bracelet shell, and a rigid patch area is arranged on the flexible circuit board; the micro thermal conductivity detector is arranged on the rigid patch area of the flexible circuit board and is electrically connected with the flexible circuit board for detecting the concentration of hydrogen; the knudsen pump is arranged on the rigid patch area of the flexible circuit board, is electrically connected with the flexible circuit board and is used for actively pumping the ambient gas to the micro thermal conductivity detector; A connection member made of a f