The siren is a kind of sound and light alarm equipment installed on the scene. When a danger occurs on the scene and confirmed, the siren can be activated by the controller of the control center to send out a strong sound and light alarm signal to achieve the purpose of reminding people on the spot.
In the construction of smart parking system, security alarm system is mainly used in two aspects:
1. The alarm prompts the direction and speed of intelligent parking
When a vehicle is driven from the ground to the underground, it will suddenly faint due to the sudden vision and because it is a downhill section, the speed of the vehicle will become faster, and it will often directly hit the wall or pedestrians due to poor control of the speed. Then you need a sound and light The alarm device, the sound and light alarm device is installed at the entrance of the underground parking lot. When a vehicle enters, the sound and light alarm device will sense the vehicle, and then send out an audible and visual alarm to remind the driver to pay attention to the direction and slow down, and also remind people nearby. Pay attention to avoiding vehicles.
The sound and light alarm device adopts imported microwave induction technology, which can sense any moving object within 8 meters, and the induction is very accurate. The horn and warning light are connected in parallel to send out a visual and auditory dual alarm prompt, which can be a complete safety warning. , The effect of voice reminders. The content of the alarm voice can be repeatedly modified, and the volume of the sound can be adjusted at will, making the use more user-friendly.
2. Alarm and smart parking lot fire alarm
Due to the different environments, there is a big difference between the fire alarm systems of underground parking lots and above-ground buildings. Generally, the air quality in civil buildings on the ground is good and can be well ventilated; while the underground parking lot has a large space, most of which have poor natural ventilation conditions. In addition, there is no sunshine all year round, the air is humid and dusty, and all kinds of pipelines must be here. Convergence, the space is crowded, when the car starts driving, there will be greater vibrations, and mutual interference between the systems will cause the fire alarm system to always operate in a bad environment such as strong electromagnetic interference.
At present, most of the fire detectors in civil buildings on the ground in our country are installed on the ceiling, the height is usually less than 6m, and the space volume of general buildings is not too large. When a fire occurs, the smoke can be easily sensed by the detector. To. In a large space such as an underground parking lot, the spread of smoke or temperature due to fire in the space will be affected, making the detection lag behind, and the fire alarm cannot be issued in the first time. The application of current fire detection technology in large space places such as underground parking lots mainly has the following two problems:
(1) The diffusion and rise of fire smoke in a large space will be diluted by the spatial effect, and its temperature and concentration will be greatly reduced. It is difficult to reach the sensitivity of the detector, and early fire alarm cannot be realized.
(2) In the case of electromagnetic interference, light interference, vibration, water vapor, dust, etc., or under severe environmental conditions, it is difficult for the fire detector to work normally, and there will often be no alarm or false alarm.
Therefore, large-space buildings such as underground parking lots require more advanced fire detection technology. With a common dual-band infrared flame detector, the design process is as follows.
The fire detector is the eye of the fire automatic alarm system. It detects the fire signal in the early stage of the fire, and quickly transmits the signal to the alarm controller to send out an alarm signal, so that people can know the occurrence of the fire in the first time, and find the fire early. The key to fire control. Common types of detectors are: temperature sensing, smoke sensing, photosensitive (ultraviolet, infrared), combustible gas and other 4 types. Because large space buildings such as underground parking lots are not suitable for ordinary temperature and smoke detectors, this design uses advanced dual-band infrared flame detectors.
The dual-band infrared flame detector is a new type of fire detector, which has been successfully applied to the fire alarm of large space buildings such as underground parking lots in foreign countries.
The working principle of the detector is to use flame and background radiation dual-information related sensing technology. When a fire occurs, when the temperature of a local object starts to rise, it will be higher than the background temperature of the environment, which will bring its infrared radiation to space. The energy of the flame and interference light will produce two different characteristic bands, and the two infrared sensor elements will respond differently to them. The internal data processing system will calculate, analyze and process the collected data in time. It will judge which are fire signals and which are interference signals, and finally transmit the correct information to the fire alarm controller, thereby greatly improving the reliability of flame detection.
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