Liquid leakage detection alarm device and method
By using staggered positive and negative lines to conduct electrical signals when liquid enters the circuit, combined with flexible circuit board monitoring of leakage, the problem of liquid intrusion not being monitored in existing technologies is solved, achieving high-precision leakage detection and alarm, and ensuring product safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- INTELLIGENT AUTOMATION ZHUHAI CO LTD
- Filing Date
- 2026-02-02
- Publication Date
- 2026-04-21
AI Technical Summary
Existing technologies cannot effectively monitor and prevent liquid intrusion into electrical equipment during testing, especially in constant temperature water tank testing, which makes it impossible to guarantee product safety and testing accuracy.
It employs staggered positive and negative circuits, utilizing the conductivity of liquid to generate an electrical signal when leakage occurs. Through the acquisition module and processing module, it achieves rapid response and alarm, and combined with flexible circuit board, it can adapt to different testing environments and product deformation.
It enables rapid leakage detection under different testing environments and product deformation scenarios, ensuring product safety and detection accuracy, and providing timely alarms to prevent damage.
Smart Images
Figure CN121898718A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of product testing, and in particular to a leakage detection alarm device and method. Background Technology
[0002] In the past, except for electrical equipment in specific fields, conventional electrical equipment was generally required to be kept away from water or liquids to prevent short circuits caused by liquid intrusion. However, with the development of technology, the structure of electrical products has become more complex, and the performance requirements have become more stringent. The requirements for waterproofing and leak prevention have also become more stringent, requiring sealing tests. However, traditional simulation methods are cumbersome and inconvenient for monitoring.
[0003] Furthermore, when temperature-measuring semiconductor devices or electronic products require temperature testing, a constant-temperature water tank is often used to simulate the temperature environment to ensure test consistency. In this testing scenario, the semiconductor device or product needs to be immersed in the constant-temperature water. However, to ensure stable temperature conduction and prevent liquid water from entering the product, the product itself needs to have good waterproof performance or undergo temporary sealing treatment. But this cannot guarantee that liquid water will not enter, nor can it monitor for leakage.
[0004] Therefore, a safer and more accurate leak detection and alarm solution applicable to various scenarios is needed to ensure the safety of product testing. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a safe, widely applicable and highly accurate leak detection alarm device and method.
[0006] The technical solution adopted in this invention is as follows: the leakage detection alarm device includes a processing module, a data acquisition module, and several detection sensors. The detection sensors include positive and negative lines that are intersected on a circuit board. The intersecting portions of the positive and negative lines are provided with exposed wire layers. The exposed wire layers of the positive and negative lines are located on the same surface and both cooperate with the component to be detected. The data acquisition module is connected to the two sets of lines of the detection sensors, and the processing module is communicatively connected to the data acquisition module.
[0007] As can be seen from the above scheme, the structure of the detection sensor achieves compatibility with different testing environments and products. Specifically, environmental adaptation is achieved by using circuit boards with different substrates as detection sensors. For example, PCB boards can be used for leak detection in planar structures and hole locations, while FPC boards are used for curved surfaces or deformable scenarios such as water baths. Utilizing the conductivity of water and common test liquids, the positive and negative terminals of the exposed circuit layers are staggered to ensure proximity, allowing liquid to conduct through the exposed layers and generate a conduction signal. The acquisition module collects and processes the conduction signal and feeds it back to the processing module. The processing module provides alarm prompts and communicates with the host computer to provide status feedback. Thus, a rapid response to leaks is achieved during testing, ensuring the structural integrity of the product under test and the safety of the test.
[0008] A preferred embodiment is that the circuit board is a flexible circuit board, and during testing, the side of the circuit board with the circuitry is aligned with the testing area.
[0009] In a preferred embodiment, both the positive and negative lines include an output section, a connection section, and several extension sections. The output end is connected to the acquisition module, the connection section is connected to the output section, and the several extension sections are arranged in an array and are all connected to the connection section. The several extension sections of the positive and negative lines are interleaved.
[0010] In a preferred embodiment, the acquisition module includes several detection modules that are communicatively connected to the processing module. Each detection module includes an ESD unit, a sensor interface, and a conversion unit. The sensor interface is connected to the detection sensor, the positive terminal of the sensor interface is connected to the power supply, the negative terminal of the sensor interface is connected to the ground wire and the conversion unit, and the ESD unit is connected between the sensor interface and the conversion unit.
[0011] A further preferred embodiment is that the conversion unit includes a filter, an amplifier, and a comparator connected in sequence. The filter is connected to the negative terminal of the sensor interface. A voltage divider unit and a voltage clamping unit are also provided between the amplifier and the comparator. The output terminal of the comparator is communicatively connected to the processing module.
[0012] In a preferred embodiment, the leakage detection alarm device further includes an alarm module, which includes a logic OR gate driver unit and an alarm driver unit. The logic OR gate driver unit is connected to the output terminal of the acquisition module, the input terminal of the alarm driver unit is connected to the output terminal of the logic OR gate driver unit, and the output terminal of the alarm driver unit is connected to a buzzer.
[0013] The leakage detection and alarm method includes the following specific steps; Step S1: Set the circuit board on the area to be tested or the detection part of the product to be tested according to the application scenario; Step S2: When a liquid leak occurs, the liquid will conduct the adjacent positive and negative lines, thereby generating an electrical signal to the acquisition module. Step S3: The acquisition module processes the electrical signal and feeds it back to the processing module, and issues an alarm notification; Step S4: The processing module reads the signal status of the acquisition module and feeds it back to the host computer.
[0014] As can be seen from the above solution, by placing the circuit board at the detection point, such as at the sealing joint or evenly distributed within the sealing membrane, the liquid will conduct electricity and generate an electrical signal when a leak occurs. This signal is then processed by the processing module and drives the alarm module to trigger an alarm. Timely removal of the liquid and product recovery ensure that the product is not damaged.
[0015] In a preferred embodiment, during leakage detection in step S1, the circuit board is a PCB circuit board or a flexible circuit board. By attaching or placing the exposed circuit layer of the circuit board to the leakage-risk area of the product under test, the liquid comes into contact with the exposed circuit layer and conducts a circuit when leakage occurs. During sealed space or water bath constant temperature testing, the circuit board is a flexible circuit board. The circuit board is placed inside the sealed bag of the sealed space or water bath constant temperature test, and the exposed circuit layer of the circuit board is attached to the surface of the product under test. In the event of liquid leakage, it can quickly respond and perform emergency treatment on the product under test. Attached Figure Description
[0016] Figure 1 This is a system block diagram of the aforementioned leakage detection and alarm device; Figure 2 This is the circuit schematic of the detection module; Figure 3 This is the circuit diagram of the alarm module; Figure 4 This is a schematic diagram of the structure of the detection sensor; Figure 5 This is a schematic diagram of the circuit structure of the detection sensor. Detailed Implementation
[0017] like Figures 1 to 5As shown, in this embodiment, the leakage detection alarm device includes a processing module 1, a data acquisition module 2, and several detection sensors 3. Each detection sensor 3 includes positive and negative lines that are intersected on a circuit board. The intersecting portions of the positive and negative lines are provided with exposed wire layers 4. The exposed wire layers 4 of the positive and negative lines are located on the same surface and both cooperate with the component to be detected. The data acquisition module 2 is connected to the two sets of lines of the detection sensors 3, and the processing module 1 is communicatively connected to the data acquisition module 2.
[0018] The circuit board can be a flexible circuit board or a rigid circuit board. In this embodiment, the circuit board is a flexible circuit board, and during testing, the side of the circuit board with the circuit lines mates with the detection area. By using a flexible circuit board, leakage detection can be adapted to various products or occasions. Utilizing the good deformation capability of the flexible circuit board itself, it can fit the product surface as closely as possible, ensuring rapid detection of leakage. At the same time, the flexible circuit board can also be compatible with special test scenarios where deformation occurs during testing, such as constant temperature water bath testing. During constant temperature water bath testing, a specific temperature environment is simulated by a constant temperature water tank. The components or electronic products that need to be tested for temperature-related purposes are encapsulated by a sealing film. The flexible circuit board is placed inside the sealing film and deforms synchronously with the sealing film. During testing, under the action of water pressure, the sealing film and the flexible circuit board adhere to the component or electronic product under test, thereby monitoring whether there is liquid leakage inside the sealing film during the test.
[0019] like Figure 4 and Figure 5 As shown, in this embodiment, both the positive and negative lines include an output segment 5, a connection segment 6, and several extension segments 7. The output terminal is connected to the acquisition module 2, the connection segment 6 is connected to the output segment 5, and the extension segments 7 are arranged in an array and all connected to the connection segment 6. The extension segments 7 of the positive and negative lines are interleaved. This structure ensures that each extension segment 7 of the positive line is flanked by extension segments 7 of the negative line, or vice versa. This guarantees that when liquid simultaneously contacts the exposed layer 4 of the line, and the liquid volume is sufficient to cover two adjacent extension segments 7, the positive line can be connected to the adjacent negative line. The spacing between two adjacent extension segments 7 is 5 mil, and the width of each extension segment 7 is 10 mil. This dense distribution ensures sufficiently high detection accuracy for leaked liquid.
[0020] like Figure 2As shown, in this embodiment, the acquisition module 2 includes several detection modules that are communicatively connected to the processing module 1. Each detection module is correspondingly connected to several detection sensors 3, enabling simultaneous monitoring of the sealing status of multiple areas. Each detection module includes an ESD unit 21, a sensor interface 22, and a conversion unit. The sensor interface 22 is connected to the detection sensors 3. The positive terminal of the sensor interface 22 is connected to the power supply, and the negative terminal is connected to ground and the conversion unit. The conversion unit includes a filter, an amplifier, and a comparator connected in sequence. The filter is connected to the negative terminal of the sensor interface 22. A voltage divider unit 23 and a voltage clamping unit 24 are also provided between the amplifier and the comparator. The output terminal of the comparator is communicatively connected to the processing module 1. The ESD unit 21 includes an ESD protection diode of model CDSDOD323-T12LC. The positive terminal of the ESD protection diode is connected between the sensor interface 22 and the conversion unit. The filter is a π-type filter. The amplifier is model OPA192IDBVR, and the comparator is model TLV3501AIDBVT. The voltage divider unit 23 includes a first resistor and a second resistor with the same resistance value. The first resistor is connected in series between the amplifier and the voltage clamping unit 24. One end of the second resistor is connected between the first resistor and the voltage clamping unit 24, and the other end of the second resistor is grounded, achieving a 50% voltage division to prevent excessive output voltage from damaging downstream components. The ESD unit 21 is used to prevent electrostatic interference in the test area. The filter processes the electrical signal, and then the signal is amplified proportionally in the same direction by the amplifier, satisfying Vout=(1+Rf / R1)*Vin Gin=2. The voltage clamping unit 24 includes a clamping diode for overvoltage protection. Finally, the comparator compares the voltage with a reference voltage and outputs a digital signal to the processing module 1. The processing module 1 identifies the specific leakage channel based on the comparator output and drives the module to issue an alarm and report to the host computer. The acquisition module 2 also includes an IO expander, which is connected to the processing module 1 via an I2C bus. The output terminals of several detection modules are respectively connected to several IO ports of the IO expander. The processing module 1 reads the status of the IO port expander and then communicates with the host computer to feed back the leakage detection results and determine the specific area where the leakage occurred.
[0021] like Figure 3As shown, in this embodiment, the leakage detection alarm device further includes an alarm module, which includes a logic OR gate driver unit 8 and an alarm driver unit 9. The logic OR gate driver unit 8 is connected to the output terminals of several detection modules. In this embodiment, there are eight detection sensors 3. The logic OR gate driving unit 8 includes a first OR gate logic chip, a second OR gate logic chip, and a third OR gate logic chip connected in sequence. The first OR gate logic chip, the second OR gate logic chip, and the third OR gate logic chip are all model 74HC32S14-13. The four pairs of interfaces of the first OR gate logic chip, totaling eight, are respectively connected to the output terminals of the eight detection modules. The four output ports of the first OR gate logic chip are connected to the two pairs of interfaces of the second OR gate logic chip. The two output ports of the second OR gate logic chip are connected to the one pair of interfaces of the third OR gate logic chip. The input terminal of the alarm driving unit 9 is connected to the output terminal of the third OR gate logic chip. When there is a conduction signal in one of the eight interfaces, the electrical signal output by the third OR gate logic chip turns on the switch of the alarm driving unit 9, thereby energizing the buzzer connected in the circuit of the alarm driving unit 9 and emitting an alarm sound. The alarm module also includes an indicator light module connected to the output terminals of several detection modules. The indicator light module includes several first LEDs and several second LEDs. When the detection module outputs a low level, the corresponding first LED is turned on, and when the detection module outputs a high level, the corresponding second LED is turned on, thereby displaying the detection status more intuitively.
[0022] The leakage detection and alarm method includes the following specific steps: Step S1: According to the application scenario, the circuit board is placed on the area to be tested or the detection part of the product to be tested; specifically, when performing leakage detection, the circuit board is a PCB circuit board or a flexible circuit board, and the exposed circuit layer 4 of the circuit board is attached to or placed on the leakage risk part of the product to be tested; when performing sealed space or water bath constant temperature test, the circuit board is a flexible circuit board, and the circuit board is placed inside the sealed bag of the sealed space or water bath constant temperature test, and the exposed circuit layer 4 of the circuit board is attached to the surface of the product to be tested. Step S2: When a liquid leak occurs, the liquid comes into contact with the exposed layer 4 of the circuit. The liquid will conduct the adjacent positive and negative circuits, thereby generating an electrical signal to the acquisition module 2. Step S3: The acquisition module 2 filters and amplifies the electrical signal, compares it with the reference voltage, and feeds it back to the processing module 1, while simultaneously driving the alarm to sound an alarm. Step S4: The processing module 1 reads the signal status of the acquisition module 2 and feeds it back to the host computer.
[0023] By employing a flexible bonding method, liquid detection and leakage alarms can be implemented during production or testing processes. This enables more effective and reliable monitoring and protection of products under test during temperature testing of semiconductors and electronic products. Furthermore, in the testing of new energy batteries, bonding is applied to the outer surface to detect whether leakage occurs during the testing process.
[0024] Although the embodiments of the present invention are described with reference to actual solutions, they do not constitute a limitation on the meaning of the present invention. Modifications to the embodiments and combinations with other solutions based on this specification will be obvious to those skilled in the art.
Claims
1. A leakage detection and alarm device, characterized in that: It includes a processing module (1), a data acquisition module (2), and several detection sensors (3). The detection sensors (3) include positive and negative lines that are intersected on a circuit board. The intersecting parts of the positive and negative lines are provided with exposed lines (4). The exposed lines (4) of the positive and negative lines are located on the same side and are both in contact with the component to be detected. The data acquisition module (2) is connected to the two sets of lines of the detection sensors (3). The processing module (1) is communicatively connected to the data acquisition module (2).
2. The leakage detection and alarm device according to claim 1, characterized in that: The circuit board is a flexible circuit board, and during testing, the side of the circuit board with the circuitry is aligned with the testing area.
3. The leakage detection and alarm device according to claim 1, characterized in that: Both the positive and negative lines include an output section (5), a connection section (6), and several extension sections (7). The output end is connected to the acquisition module (2), the connection section (6) is connected to the output section (5), and several extension sections (7) are arranged in an array and are all connected to the connection section (6). The several extension sections (7) of the positive and negative lines are interleaved.
4. The leakage detection and alarm device according to claim 1, characterized in that: The acquisition module (2) includes several detection modules that are communicatively connected to the processing module (1). The detection module includes an ESD unit (21), a sensor interface (22), and a conversion unit. The sensor interface (22) is connected to the detection sensor (3). The positive terminal of the sensor interface (22) is connected to the power supply, and the negative terminal of the sensor interface (22) is connected to the ground wire and the conversion unit. The ESD unit (21) is connected between the sensor interface (22) and the conversion unit.
5. A leakage detection and alarm device according to claim 4, characterized in that: The conversion unit includes a filter, an amplifier and a comparator connected in sequence. The filter is connected to the negative terminal of the sensor interface (22). A voltage divider unit (23) and a voltage clamping unit (24) are also provided between the amplifier and the comparator. The output terminal of the comparator is connected to the processing module (1) in communication.
6. The leakage detection and alarm device according to claim 1, characterized in that: It also includes an alarm module, which includes a logic OR gate driver unit (8) and an alarm driver unit (9). The logic OR gate driver unit (8) is connected to the output terminal of the acquisition module (2), the input terminal of the alarm driver unit (9) is connected to the output terminal of the logic OR gate driver unit (8), and the output terminal of the alarm driver unit (9) is connected to a buzzer.
7. A method for detecting and alarming leakage, implemented using a leakage detection and alarm device according to any one of claims 1 to 6, characterized in that, It includes the following specific steps: Step S1: Set the circuit board on the area to be tested or the detection part of the product to be tested according to the application scenario; Step S2: When a liquid leak occurs, the liquid will connect the adjacent positive and negative lines, thereby generating an electrical signal to the acquisition module (2). Step S3: The acquisition module (2) processes the electrical signal and feeds it back to the processing module (1), and issues an alarm notification. Step S4: The processing module (1) reads the signal status of the acquisition module (2) and feeds it back to the host computer.
8. A leakage detection and alarm method according to claim 7, characterized in that: In step S1, when performing leakage detection, the circuit board is a PCB circuit board or a flexible circuit board. By attaching or placing the exposed circuit layer (4) of the circuit board to the leakage risk area of the product under test, the liquid comes into contact with the exposed circuit layer (4) and conducts a circuit when leakage occurs. When performing sealed space or water bath constant temperature test, the circuit board is a flexible circuit board. The circuit board is placed inside the sealed bag of the sealed space or water bath constant temperature test. The exposed circuit layer (4) of the circuit board is attached to the surface of the product under test. When liquid leakage occurs, it responds quickly and performs emergency treatment on the product under test.