Device for detecting water leakage of watertight box

Abstract

The utility model discloses a device for detecting water leakage of a watertight box. According to the utility model, the two metal wire probes of the detection electrode, which are not contacted with each other, are arranged on the inner bottom surface of the cavity of the watertight box by utilizing a good conductor characteristic that seawater is used as electricity, so that the watertight box is submerged in time when entering the seawater due to water tightness failure, the seawater is conductive to form a closed circuit, and the indicator light is lightened to prompt that the watertight box leaks water. The device is small in size, light in weight, simple in structure, low in cost and visual in display.

Description

Technical Field

[0001] The utility model relates to the technical field of underwater electronic equipment, and particularly relates to a device for detecting water leakage of a watertight box. Background Art

[0002] As an electronic device working underwater, it has developed rapidly in recent years. At present, there are many cables in underwater electronic equipment. A feasible method is to gather multiple cables through a watertight box underwater first. After greatly reducing the number of cables, they then enter the in-cabin electronic equipment through a watertight cabin. Since the watertight box is installed underwater and needs to bear huge seawater pressure, it is easy to cause the failure of watertightness, allowing seawater to enter the cavity of the watertight box, causing the electronic components in the cavity of the watertight box to fail or be damaged due to short circuit, thus making the electronic equipment unable to work properly.

[0003] At present, due to volume limitations, domestic watertight boxes are not equipped with devices for detecting water leakage of the watertight box, resulting in the inability to timely understand whether the watertight box leaks. Traditional water leakage detection devices, such as tuning fork water detection devices, are large in volume and weight and complex in structure, and cannot be used inside the watertight box. Summary of the Utility Model

[0004] In view of this, the utility model provides a device for detecting water leakage of a watertight box, which can effectively detect whether the watertightness of the watertight box fails, and is small in volume, light in weight and simple in structure.

[0005] The device for detecting water leakage of the watertight box of the utility model is characterized by comprising: a detection electrode, an AC power supply, a current-limiting resistor, a rectification circuit, a relay, a DC power supply and an indicator light;

[0006] Among them, the detection electrode includes two non-touching metal wire probes, which are installed on the inner bottom surface of the cavity of the watertight box; the detection electrode is successively connected in series with the AC power supply and the current-limiting resistor;

[0007] The rectification circuit is used to convert the AC signal output by the detection electrode into a DC signal and transmit it to the relay;

[0008] The relay is connected in series with the DC power supply and the indicator light.

[0009] Preferably, the rectification circuit is a bridge rectification circuit.

[0010] Preferably, the outer diameter of the metal wire of the metal wire probe is not less than 3 mm.

[0011] Preferably, the metal wire probe is made of stainless steel wire, chrome-plated iron wire or gold-plated iron wire.

[0012] Preferably, the output voltage of the AC power supply (2) is not lower than 5 V and not higher than 12 V; the frequency is not less than 50 Hz.

[0013] Preferably, it further includes a display, and the display is connected to the output of the relay (5) for displaying the detection result.

[0014] Advantageous effects:

[0015] The utility model utilizes the property that seawater is a good conductor of electricity. The two non-touching metal wire probes of the detection electrode 1 are placed on the inner bottom surface of the watertight box cavity, so that when the watertightness of the watertight box fails and seawater enters, it will be submerged in time. The seawater conducts electricity to form a closed circuit, which in turn causes the indicator light to turn on, indicating that the watertight box is leaking.

[0016] The device of the utility model is small in size, light in weight, simple in structure, low in cost, and intuitive in display.

[0017] The detection signal output of the device of the utility model can be set as the input of the display, and the display can be used to simultaneously display whether multiple watertight boxes are leaking. Description of the drawings

[0018] Figure 1 It is the electrical schematic diagram of the device for detecting the leakage of the watertight box of the utility model.

[0019] Figure 2 It is the circuit connection diagram of the device for detecting the leakage of the watertight box of the utility model.

[0020] Among them, 1 - detection electrode, 2 - AC power supply, 3 - current-limiting resistor, 4 - rectifier diode, 5 - relay, 6 - DC power supply, 7 - indicator light. Specific embodiments

[0021] The following combines the drawings and gives examples to describe the utility model in detail.

[0022] The utility model provides a device for detecting the leakage of a watertight box, and its specific electrical principle is as Figure 1 shown. The device of the utility model includes a detection electrode 1, an AC power supply 2, a current-limiting resistor 3, a rectification circuit, a relay 5, a DC power supply 6, and an indicator light 7. The specific circuit connection is as Figure 2 shown.

[0023] The detection electrode 1, the AC power supply 2, and the current-limiting resistor 3 are connected in series. The detection electrode 1 is used as a sensor. Utilizing the property that seawater is a good conductor of electricity, when the device is not flooded, the detection electrode 1 is not conductive. When the seawater submerges the detection electrode 1, the detection electrode 1 becomes conductive, and the detection electrode 1 outputs an AC signal. The rectification circuit rectifies the AC signal output by the detection electrode 1 to convert the alternating current into direct current and outputs it to the relay 5;

[0024] The relay 5 is connected in series with the DC power supply 6 and the indicator light 7; the relay 5 is used to provide AC-DC isolation; the DC power supply 6 is used to supply power to the indicator light 7; when the detection electrode is conducting, the indicator light 7 lights up.

[0025] Among them:

[0026] 1) There is a total of 1 group of detection electrodes 1 (including 2 probes), and the probes can be made of metal wires with an outer diameter of not less than φ3mm. The metal wire should be made of an inert metal material, such as stainless steel wire, chrome-plated iron wire, or gold-plated iron wire, etc., and should not be made of aluminum wire, copper wire, or galvanized iron wire, etc. The detection electrode 1 should be installed on the inner bottom surface of the watertight box cavity so that when the watertightness of the watertight box fails and seawater enters, it can be submerged in time.

[0027] 2) The output voltage of the AC power supply 2 should not be lower than 5V and not higher than 12V (it is difficult to drive the relay when the voltage is lower than 5V, and serious electrolytic corrosion of the detection electrode will occur when it is higher than 12V); the frequency should not be less than 50Hz, and 400Hz is generally recommended. If the AC frequency is too low or a DC power supply is directly used, serious electrolytic corrosion of the detection electrode will occur when the circuit is connected.

[0028] 3) The resistance value of the current-limiting resistor 3 is selected according to the situation. In actual use, the current in the detection electrode circuit should be controlled not to exceed 10mA, generally about 4kΩ - 10kΩ, otherwise serious electrolytic corrosion of the detection electrode will occur.

[0029] 4) The rectifier circuit includes 4 rectifier diodes 4, and its function is to convert alternating current into direct current. In this embodiment, the classic bridge rectifier circuit is used for the rectifier circuit, and this rectifier circuit can also be replaced by other types of rectifier circuits.

[0030] 5) The function of the relay 5 is to provide AC-DC isolation. The rated working voltage of the relay 5 should match the output voltage of the AC power supply 2.

[0031] 6) The DC power supply 6 is used to supply power to the indicator light 6. The output voltage of the DC power supply 6 matches the rated working voltage of the indicator light, generally 5V or 24V.

[0032] 7) The indicator light 7 is used to indicate whether the watertight box is leaking and seawater has entered the cavity. When seawater enters, the indicator light 7 lights up; when there is no seawater, the indicator light 7 goes out.

[0033] In addition, the output of the relay 5 in one or more devices for detecting the leakage of the watertight box can be used as the input of the display, and the detection results can be centrally displayed on the display.

[0034] The device of the present utility model can fully meet the requirements of the narrow space inside the watertight box. The size of the traditional watertightness failure detection device is generally not less than 300mm (length) × 300mm (width) × 200mm (height), the weight is not less than 5kg, and the cost price is generally about 5000 yuan. However, the size of the sensor adopted by the device of the present utility model has an outer diameter generally not greater than φ20mm and a length not greater than 200m, the weight is not greater than 0.5kg, and the cost price is generally about 200 yuan. The device of the present utility model obviously has the advantages of small size, light weight, simple structure and low cost.

[0035] In summary, the above are only the preferred embodiments of the present utility model and are not intended to limit the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A device for detecting water leakage in a watertight box, characterized in that: include: Detection electrode (1), AC power supply (2), current limiting resistor (3), rectifier circuit, relay (5), DC power supply (6) and indicator light (7); The detection electrode (1) comprises two metal wire probes that are not in contact with each other and are mounted on the inner bottom surface of the watertight box cavity; the detection electrode (1) is connected in series with an AC power source (2) and a current limiting resistor (3); The rectifier circuit is used to convert the AC signal output by the detection electrode (1) into a DC signal and transmit it to the relay (5); The relay (5) is connected in series with the DC power supply (6) and the indicator light (7).

2. The device according to claim 1, characterized in that The rectifier circuit is a bridge rectifier circuit.

3. The device according to claim 1, characterized in that The outer diameter of the metal wire of the metal wire probe shall not be less than 3mm.

4. The device according to claim 1 or 3, characterized in that The metal wire probe is made of stainless steel wire, chrome-plated wire or gold-plated wire.

5. The device according to claim 1, characterized in that The output voltage of the AC power source (2) is not less than 5V and not more than 12V; the frequency is not less than 50Hz.

6. The device according to claim 1, characterized in that It also includes a display, which is connected to the output of the relay (5) and is used to display the detection results.

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