Intelligent local ventilation system

Abstract

The invention belongs to site ventilation technologies and particularly relates to an intelligent local ventilation system applied to mines underground. The intelligent local ventilation system comprises a local ventilator, a speed adjusting device and a sensor or an underground signal monitoring system, wherein the local ventilator is a switch reluctance local ventilator. The speed adjusting device is an intelligent speed adjusting device and comprises a power source filter, a contactor, a switch reluctance controller, a programmable logic controller (PLC) control system 1, an intrinsically-safe isolating circuit and a transformer. The sensor is a gas, temperature and wind speed sensor. The sensor or the underground signal monitoring system is connected with the PLC control system 1 through the intrinsically-safe isolating circuit. Compared with the prior art, the intelligent local ventilation system is simple in structure, convenient to maintain, small in electromagnetic interference, high in system efficiency and long in service life, runs reliably and can achieve intelligent speed adjustment.

Description

technical field [0001] The invention belongs to the place ventilation technology, in particular to an intelligent local ventilation system applied in underground mines. Background technique [0002] At present, the local ventilation system under the mine generally uses ordinary motors. Once put into operation, the local ventilation fan will run at the rated air volume and wind pressure, forming the so-called "one wind blowing" phenomenon. This kind of ventilation system often cannot reasonably control the amount of gas discharged, which may cause the gas to exceed the limit in some areas and bring unsafe factors. In order to ensure safety, the selection of the local fan power of the system is usually set according to the principle of ensuring the normal oxygen inhalation and gas concentration of personnel do not exceed the limit at the longest distance. Therefore, the selected power is generally too large. When the tunneling depth is shallow , there will be a phenomenon of ...

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Problems solved by technology

[0004] 1. The speed control system of this patent adopts AC frequency conversion speed control. Due to the high operating frequency of the AC frequency conversion controller, its operation reliability is low, the service life is short, and the electromagnetic interference to the environment is strong;

[0005] 2. The patent uses a multi-stage counter-rotating local fan, which has a complex structure and low ventilation efficiency;

[0006] 3. The patent adopts the integrated design of the frequency converter and the local fan. Although it saves space, it is extremely inconvenient, laborious and time-consuming during equipment maintenance, and the entrance affects the overall operation.

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