一种高瓦斯隧道轴流风机控制系统

Abstract

一种高瓦斯隧道轴流风机控制系统，涉及风机控制技术领域，包括风管、通风机构、甲烷传感器和PLC，所述风管上间隔安装多个通风机构，且风管的每个通风机构处安装有至少一个甲烷传感器；所述通风机构包括选择电路、工作风机、备用风机和运行检测电路；选择电路与PLC的输出引脚电连接，选择电路的输出端分别与工作风机和备用风机电连接，且工作风机和备用风机同时仅有一个处于工作状态；所述运行检测电路用于检测工作风机或备用风机的工作状态；所述PLC的输入引脚分别与多个甲烷传感器电连接；其用于解决传统隧道内通风效果差的问题。

Claims

1. A high-gas tunnel axial flow fan control system, characterized by, It includes a duct (1), a ventilation mechanism (2), a methane sensor (3) and a PLC (4). Multiple ventilation mechanisms (2) are installed at intervals on the duct (1), and at least one methane sensor (3) is installed at each ventilation mechanism (2) of the duct (1). The ventilation mechanism (2) includes a selection circuit (21), a working fan (22), a standby fan (23), and a running detection circuit (24). The selection circuit (21) is electrically connected to the output pin of the PLC (4), and the output terminal of the selection circuit (21) is electrically connected to the working fan (22) and the standby fan (23) respectively. Only one of the working fan (22) and the standby fan (23) is in working state at the same time. The running detection circuit (24) is used to detect the working state of the working fan (22) or the standby fan (23). The input pins of the PLC (4) are electrically connected to multiple methane sensors (3).

2. The high-gas tunnel axial flow fan control system of claim 1, wherein: Two methane sensors (3) are installed at each of the ventilation mechanisms (2).

3. The high-gas tunnel axial flow fan control system of claim 1, wherein: The methane sensor (3) is model MH-440D.

4. The high-gas tunnel axial flow fan control system of claim 1, wherein: The selection circuit (21) includes a first contactor (211), a second contactor (212), a first relay (213), and a second relay (214). The coils of the first contactor (211) and the second contactor (212) are electrically connected to the PLC (4). The normally open contact of the first contactor (211) is connected in series with the coil of the first relay (213), the normally closed contact of the second relay (214), and the working fan (22). The normally open contact of the second contactor (212) is connected in series with the coil of the second relay (214), the normally closed contact of the first relay (213), and the standby fan (23).

5. The high-gas tunnel axial flow fan control system of claim 1, wherein: The operation detection circuit (24) includes a digital current transmitter (241) and an opto-isolator (242), wherein the signal input terminal of the digital transmitter is electrically connected to the working fan (22), and the signal output terminal of the digital transmitter is electrically connected to the signal input pin of the PLC (4); The signal input terminal of the opto-isolator (242) is electrically connected to the coil of the coil of the first contactor (211), and the signal output terminal of the opto-isolator (242) is electrically connected to the signal input pin of the PLC (4).

6. The high-gas tunnel axial flow fan control system according to claim 1, characterized in that: The PLC (4) is a SIMATIC S7-1200.

7. The high-gas tunnel axial flow fan control system of claim 1, wherein: A partition is provided in the middle of the air duct (1).

8. The high-gas tunnel axial flow fan control system of claim 1, wherein: The ventilation mechanism (2) also includes a frequency converter connected in series between the selection circuit (21) and the working fan (22).

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