Low-voltage electric fire prevention and detection device

Abstract

The invention discloses a low-voltage electric fire prevention and detection device, which mainly comprises at least one group of detection cables (10), a capacitor C and a multi-path intelligent detector (11), wherein each detection cable (10) consists of a heat-shrinkable bush (1), two metal wires (2) and an isolating plastic tube (3); the two metal wires (2) are arranged in the isolating plastic tube (3) side by side; a cavity (4) is reserved between the two metal wires (2); the isolating plastic tube (3) is wrapped by the heat-shrinkable bush (1); the multi-path intelligent detector (11) is connected to one end of each group of detection cables (10); and the other end of each group of detection cables (10) is connected with the capacitor C to form a loop to detect the quality of the detection cables (10). According to the low-voltage electric fire prevention and detection device, the heat-shrinkable bush with high cost performance is used as a heat sensor; the low-voltage electric fire prevention and detection device is suitable for fault detection of a low-voltage electric system; accurate detection of a fault point can be realized; and the low-voltage electric fire prevention and detection device has the advantages of low manufacturing cost, simplicity, easiness, safety, reliability and capability of effectively preventing occurrence of low-voltage electric fire.

Description

technical field [0001] The invention relates to the field of fire detection equipment for low-voltage power supply systems, in particular to a device for realizing fire prevention and detection by applying heat shrinkable tube technology. Background technique [0002] The fire caused by electrical circuit fault is one of the most important causes of fire. How to effectively detect low-voltage electrical circuit faults has become an important content in the field of fire detection and prevention. [0003] We know: 1) After the current delivered by the low-voltage power supply line exceeds the rated current value, the power supply line will generate a higher temperature, and even melt the insulating layer on its outer surface to cause a short circuit, and even generate high temperature and arc, causing a fire. 2) There are many electrical connectors on the low-voltage power distribution side. When these connectors are used for a long time, "poor contact" may occur, resulting i...

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Problems solved by technology

[0003] We know: 1) After the current delivered by the low-voltage power supply line exceeds the rated current value, the power supply line will generate a higher temperature, and even melt the insulating layer on its outer surface to cause a short circuit, and even generate high temperature and arc, causing a fire

2) There are many electrical connectors on the low-voltage power distribution side. When these connectors are used for a long time, "poor contact" may occur, resulting in high temperature and electric sparks at the connectors, which is one of the causes of electrical fires

[0005] 1) Install probes such as thermistors and temperature sensors on the power supply cable to generate an alarm signal after a certain temperature is detected. This method has certain defects: A. The sensor is an active device and needs to be provided with working power; B , The monitoring points are discontinuous; C. When there are many detection objects, a large number of probes are required, the amount of transmitted data will increase, and the cost will increase; D. The longer the transmission link, the more interference it receives, and the reliability will decrease a lot

[0006] 2) Install an alloy probe in the low-voltage power supply cable to sense temperature changes. This alloy is arranged together with the cable. Because this alloy is very expensive, the cost of this cable is also very high. It cannot be used in special places. Yes, it also has a flaw: it cannot detect the specific place where the high temperature occurs

The detection end of this device is a photoelectric conversion device, and its cost is not low. At the same time, once the optical fiber fails, its maintenance is very inconvenient and requires special equipment.

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