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I. Overview
Building automation includes a smoke control system. Its main function is to satisfy a gas flow pressure difference between an elevator front room, an anterior room for merging, fire fighting stairs, and indoor space, and to ensure that in the fire-fighting environment, To ensure the outdoor emission of flue gas or the requirements of flue discharge, and to prevent the air pressure of the air supply duct from being excessively large, resulting in failure of the safety door to be normally pushed open, the automatic control of the smoke control system was proposed. The core equipment for system control is: Fan, fan bypass valve (pressure relief valve), air flow Sensor, system control, etc., LFM7003 wind control system is to meet the automatic control of the space gas flow in buildings and the safety control in the fire fire environment to ensure the normal escape route Personnel try to avoid secondary hazards caused by smoke.
II. Description of Digital Intelligent Control of LFM7001 Wind Control System
The LFM7001 fire-fighting control system is mainly used to meet the gas-flow automatic control system of mid- to high-end smoke control systems and precise pressure control of building gas flow. It is widely used in 22-storey residential buildings and large commercial buildings. Using LFM108 and LFM11 micro-differential pressure transmitters to measure the precise pressure changes of the gas flow in the distributed areas of each floor, and to determine whether it meets the design flow pressure requirements through the change of flow, and send the digital analog signals to the LFM7001 collection system. Through intelligent analysis of the system, the fan bypass valve can be opened or closed and the gas flow in each area of ​​the real floor can be regulated. This can intelligently control the gas flow inside the building to maintain a reasonably qualified fire safety environment and a reasonable gas distribution requirement. The system has high-precision, digital, and intelligent signal data 485 communication and conduction, with intelligent digital visualization of long-distance communication, and easy installation, intelligent remote, digital visualization, self-testing and other advantages, leading the domestic same industry sector.
Third, the gas pressure differential transmitter technology
The gas differential pressure sensor is a product based on the mechanical differential pressure table and the mechanical differential pressure function. The product is mainly composed of three parts: gas pressure change sensing system, signal collection and conversion unit, and data output unit. The sensing of pressure changes is measured and converted into analog or digital signals for transmission to the acquisition control system. The purpose of gas flow control is achieved by detecting changes in the gas micro-pressure.
Generally used in a large number of areas such as HVAC systems, energy management systems, VAV and fan control, environmental pollution control static piping and clean room pressure, smoke hood control, oven pressurization, and furnace ventilation control.
The gas differential pressure sensor is based on the mechanical differential pressure meter and the mechanical differential pressure function. The mechanical pointer differential pressure meter only has the pointer display function, and the mechanical pressure differential meter can only realize the gas pressure in the invisible environment. Change alarm or approximate control, mechanical products have measurement roughness and mechanical transmission characteristics, and gas micro-differential sensors are electronic chip control sensing core unit to achieve digital visualization, high-precision measurement, big data processing and other characteristics to meet the modern intelligent centralized control System signal acquisition requirements.
The product mainly consists of three parts: the gas pressure change sensing system, the signal collection and conversion unit, and the data output unit. It measures the change in gas pressure and converts it into an analog or digital signal for transmission to the collection control system. To achieve the purpose of gas flow control. Sensing system is generally chip sensing, conventional diffusion silicon crystals and other chips, the superiority of its product performance for the quality of the chip determines the core performance, through the sensing system to collect gas pressure after the original data through the processing chip to achieve analog or digital signal output, Complete the data repair in different environments. The general output method is the output source of micro-signal (V) (mA), which is transmitted to the centralized control system through the beamline or optical fiber, and finally realizes the collection of gas pressure at the site and the control system. Complete the appropriate program for distribution.
At present, the main products in the market are: non-programmable differential pressure sensor, programmable differential pressure sensor, programmable differential pressure sensor with display
Generally used in a large number of areas such as HVAC systems, energy management systems, VAV and fan control, environmental pollution control static piping and clean room pressure, smoke hood control, oven pressurization, and furnace ventilation control.
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Yuheng Optics Co., Ltd.(Changchun) , https://www.yhenoptics.com