A liquid detector

Abstract

The utility model relates to a kind of liquid detectors, including circuit board, its front is equipped with detection circuit layer, detection circuit layer includes first detection circuit and second detection circuit independent of each other, first detection circuit includes a plurality of first detection wire and a first connecting wire, second detection circuit includes a plurality of second detection wire and a second connecting wire;First detection wire and second detection wire are sequentially arranged in alternation on the front of circuit board, first connecting wire connects all first detection wire, second connecting wire connects all second detection wire, first detection wire, second detection wire, first connecting wire and second connecting wire are spread on the front of circuit board;Gap between adjacent first detection wire and second detection wire is equipped with waterproof isolation layer, and the thickness of waterproof isolation layer is not less than the thickness of detection circuit layer.The utility model has good detection precision, response speed is fast and detection area is large.

Description

Technical Field

[0001] This utility model relates to the field of detection equipment technology, and in particular to a liquid detector. Background Technology

[0002] Some servers have high requirements for their operating environment. Humidity or leakage can affect their operation. More specifically, leakage that falls onto the outside of the server or condensation on the outside of the server due to humid air can affect its normal operation. In the past, hygrometers were used for detection. However, hygrometers cannot accurately determine whether there is leakage or water droplets on the outside of the server, and their response is slow. They generally only measure atmospheric humidity, and their response is even slower if there is leakage. Utility Model Content

[0003] The purpose of this invention is to provide a liquid detector that has good detection accuracy, fast response speed and large detection area.

[0004] To achieve the above objectives, this utility model discloses a liquid detector, which includes a circuit board. The front side of the circuit board has a detection circuit layer, which includes independent first and second detection circuits. The first detection circuit includes a plurality of first detection wires and a first connecting wire, and the second detection circuit includes a plurality of second detection wires and a second connecting wire. The first and second detection wires are alternately arranged sequentially on the front side of the circuit board. The first connecting wire connects all the first detection wires, and the second connecting wire connects all the second detection wires. The first, second, first, and second detection wires cover the entire front side of the circuit board. A waterproof isolation layer is provided in the gap between adjacent first and second detection wires, and the thickness of the waterproof isolation layer is not less than the thickness of the detection circuit layer.

[0005] By setting up independent first and second detection lines, and arranging first, second, first, and second connecting wires across the front of the circuit board, with the first and second detection wires alternately positioned on the front, when a leaking liquid drips onto the front of the circuit board or a water droplet forms, and the liquid or droplet is relatively large, it overcomes the obstruction of the waterproof barrier, thus "bridging" between adjacent first and second detection wires. At this point, by measuring the changes in electrical signals (such as resistance, current, and voltage) between the first and second detection lines, accurate and rapid feedback can be obtained, and the detection area is large. Taking the detection of continuity between the first and second detection lines as an example, the first detection line connects to the chip's digital output port, and the second detection line connects to the chip's digital input port. Because the first and second detection lines are independent, the chip's digital input port normally does not receive a signal. When a leaking liquid or water droplet connects adjacent first and second detection wires, the chip's digital input port receives a signal, indicating that liquid has been detected.

[0006] Preferably, the width of both the first and second detection leads is 0.5±0.02mm, the gap width between the first and second detection leads is 0.1±0.03mm, and the waterproof isolation layer is 0.1±0.02mm thicker than the detection circuit layer. This arrangement ensures that no electrical signal change occurs when small droplets of liquid fall (or appear) on the front side of the circuit board, preventing the detector from becoming overly sensitive.

[0007] Preferably, both the first and second detection wires are straight lines. This arrangement facilitates layout and fabrication.

[0008] Preferably, the waterproof barrier layer is an ink layer.

[0009] Preferably, the front side of the circuit board is divided into a detection area and a mounting area, and a connector is mounted in the mounting area; the first detection wire, the second detection wire, the first connecting wire, and the second connecting wire are distributed throughout the detection area, and the first connecting wire and the second connecting wire are all connected to the connector. This arrangement facilitates the connection of the sensor to external detection elements.

[0010] Preferably, the circuit board is an FPC. This arrangement facilitates the external mounting of the sensor on a server or similar device.

[0011] Preferably, a reinforcing sheet is provided on the back of the circuit board, directly opposite the mounting area.

[0012] Preferably, a resistor is connected in series with the first connecting wire and / or the second connecting wire. This arrangement is to avoid problems such as short circuits and burnout of the circuit when water droplets "bridge" the connection.

[0013] Preferably, an adhesive layer is provided on the back of the circuit board. This arrangement facilitates sensor mounting.

[0014] Preferably, of the first detection wire, the second detection wire, the first connecting wire, and the second connecting wire, at least the first detection wire and the second detection wire are copper wires or gold-plated copper wires. This arrangement ensures detection sensitivity.

[0015] This utility model has the following beneficial effects: When a leaking liquid drips onto the front of the circuit board or forms water droplets on the front of the circuit board, and the volume of the leaking liquid or water droplets is relatively large, it will overcome the obstruction of the waterproof isolation layer, thereby "bridging" between the adjacent first and second detection leads. At this time, by measuring the changes in electrical signals (such as changes in resistance, current, and voltage) between the first and second detection leads, feedback can be obtained accurately and quickly, and the detection area is large. Attached Figure Description

[0016] Figure 1 This is a front view of the present invention (corresponding to the front of the circuit board).

[0017] Figure 2 This is a schematic diagram of the back of the present invention (corresponding to the back of the circuit board).

[0018] Figure 3 for Figure 1 A diagram showing the connectors hidden.

[0019] Figure 4 This is a partial sectional view of the present invention.

[0020] Note: Because the actual layout of the first and second detection lines is very dense, this is for ease of viewing. Figure 1-4 The first and second detection lines have been simplified.

[0021] Explanation of symbols for main components: Circuit board 1, adhesive layer 2, connector 3, first detection wire 4, first connecting wire 5, second detection wire 6, second connecting wire 7, waterproof isolation layer 8, reinforcing sheet 9. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] like Figure 1-4 As shown, Figure 1-4 As shown, this utility model discloses a liquid detector, which includes a circuit board 1. Preferably, the circuit board 1 is made of FPC, which has the advantages of being thin and flexible. An adhesive layer 2 is provided on the back of the FPC to facilitate bonding to equipment (such as a server) for easy installation. Before installation, release paper is attached to the adhesive layer 2.

[0024] The front of the FPC is divided into a detection area and a mounting area. The mounting area houses the connector 3. Ideally, the size of the mounting area should match the shape of the connector 3. In practice, the connector 3 has a very small area, so the mounting area occupies a small proportion of the front of the FPC. A reinforcing piece 9 is located on the back of the FPC, directly opposite the mounting area. The connector 3 is positioned to facilitate electrical connection between the detector and external devices. The connector 3 can be a socket with at least two pins, which are designated PIN1 and PIN2 for easy identification.

[0025] A detection circuit layer is provided on the front side of the FPC. This layer includes independent first and second detection circuits. The first detection circuit includes several first detection wires 4 and a first connecting wire 5. The second detection circuit includes several second detection wires 6 and a second connecting wire 7. The first detection wires 4 and second detection wires 6 are alternately arranged on the front side of the circuit board 1, spaced apart and not intersecting. The first connecting wire 5 connects all the first detection wires 4 and PIN1, and the second connecting wire 7 connects all the second detection wires 6 and PIN2. In this way, any first detection wire 4 can be connected to its adjacent second detection wire 6 via a water droplet "bridge," thus forming a closed circuit between the first and second detection circuits. To prevent short circuits and potential circuit burnout, a resistor is connected in series with the first connecting wire 5 and / or the second connecting wire 7. Furthermore, the first detection wires 4, second detection wires 6, first connecting wires 5, and second connecting wires 7 cover the detection area, ensuring sufficient detection coverage.

[0026] To ensure detection sensitivity, at least the first detection wire 4 and the second detection wire 6 are made of copper wire or gold-plated copper wire, among the first detection wire 4, the second detection wire 6, the first connecting wire 5, and the second connecting wire 7. Furthermore, for ease of arrangement and fabrication, it is preferable that both the first detection wire 4 and the second detection wire 6 are straight lines.

[0027] A waterproof isolation layer 8 is provided in the gap between adjacent first detection lead 4 and second detection lead 6. It is also preferable to provide waterproof isolation layers 8 in the gaps between the first detection lead 4 and the second connecting lead 7, and between the second detection lead 6 and the first connecting lead 5. The waterproof isolation layer 8 is preferably an ink layer, and its thickness is not less than the thickness of the detection circuit layer. In a preferred embodiment, the width W1 of the first detection lead 4 and the width W2 of the second detection lead 6 are both 0.5 ± 0.02 mm, the gap width L between the first detection lead 4 and the second detection lead 6 is 0.1 ± 0.03 mm, and the thickness difference H between the waterproof isolation layer 8 and the detection circuit layer is 0.1 ± 0.02 mm, meaning the waterproof isolation layer 8 protrudes 0.1 ± 0.02 mm above the detection circuit layer. This arrangement ensures that no electrical signal change occurs when a small droplet of liquid falls (or appears) on the front side of the circuit board 1, preventing the detector from becoming overly sensitive.

[0028] During manufacturing, the first and second detection lines are etched onto the copper layer of the FPC, then gold-plated, followed by ink application. The ink on the first and second detection lines is then removed, resulting in the waterproof isolation layer 8. Finally, the connector 3 is installed. The resistor can be placed in the mounting area or on an external device for measuring electrical signals, such as on the server's detection circuit board. During installation, simply peel off the release paper, allowing the adhesive layer 2 to adhere to the server's casing, and connect the server's detection circuit board and connector 3 using connecting cables.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A liquid detector, characterized in that: The device includes a circuit board with a detection circuit layer on its front side. The detection circuit layer includes independent first and second detection circuits. The first detection circuit includes a plurality of first detection wires and a first connecting wire, and the second detection circuit includes a plurality of second detection wires and a second connecting wire. The first and second detection wires are alternately arranged on the front side of the circuit board. The first connecting wires connect all the first detection wires, and the second connecting wires connect all the second detection wires. The first, second, first, and second detection wires cover the entire front side of the circuit board. A waterproof isolation layer is provided in the gap between adjacent first and second detection wires, and the thickness of the waterproof isolation layer is not less than the thickness of the detection circuit layer.

2. The liquid detector according to claim 1, characterized in that: The width of the first detection wire and the second detection wire is 0.5±0.02mm, the gap width between the first detection wire and the second detection wire is 0.1±0.03mm, and the waterproof isolation layer is 0.1±0.02mm thicker than the detection circuit layer.

3. The liquid detector according to claim 1, characterized in that: Both the first and second detection leads are straight lines.

4. The liquid detector according to claim 1, characterized in that: The waterproof barrier layer is an ink layer.

5. The liquid detector according to claim 1, characterized in that: The front of the circuit board is divided into a detection area and a mounting area, and a connector is installed in the mounting area. The first detection wire, the second detection wire, the first connecting wire, and the second connecting wire are distributed in the detection area, and the first connecting wire and the second connecting wire are all connected to the connector.

6. The liquid detector according to claim 5, characterized in that: The circuit board is an FPC.

7. The liquid detector according to claim 6, characterized in that: A reinforcing plate is provided on the back of the circuit board, directly opposite the mounting area.

8. The liquid detector according to claim 1, characterized in that: A resistor is connected in series on the first connecting wire and / or the second connecting wire.

9. The liquid detector according to claim 1, characterized in that: An adhesive layer is provided on the back of the circuit board.

10. The liquid detector according to claim 1, characterized in that: Of the first detection wire, the second detection wire, the first connecting wire, and the second connecting wire, at least the first detection wire and the second detection wire are copper wires or gold-plated copper wires.

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