37results about How to "Improve ventilation quality" patented technology

The invention relates to a natural ventilation system for a coal mine underground and a natural ventilation method for the coal mine underground. The natural ventilation system comprises a main air return roadway, a main return air duct, an exhausting chimney, and a return air duct, wherein the return air duct is synchronously extended into a mining area along mining and tunneling actions, gas generated in a tunneling process is extracted and conveyed into the main coal mine air return roadway or the main return air duct through the suction inlet of the return air duct before being diffused, and finally discharged through the exhausting chimney; a return air connection roadway or a return air connection pipeline is arranged on the innermost end of the mining area and the return air pipeline in a first mining area is connected with other subsequent mining areas, or the first mining area is connected with the other subsequent mining areas. According to the system and the method, the problem of gas accumulation in the mining area and the mining empty area is completely solved, so that gas in each place of the mining areas can enter into the main return air roadway or the main return air duct in the first time and cannot be retained in the production area and accumulated in the mining empty area, gas explosion is completely eradicated, the energy is saved and the hole is in a constant temperature status such as warmer winter and cooler summer.

The invention relates to an engine, in particular to a rotor engine. The main moving elements of the engine comprise an actuating shaft and a rotor, wherein, the actuating shaft adopts a double eccentricity mode; that is, the actuating shaft comprises an output shaft and an inner eccentric shaft; a main shaft journal of the inner eccentric shaft (3) is arranged in an eccentric hole of the output shaft; the rotor (4) is arranged on an eccentric shaft journal of the inner eccentric shaft; the rotational speed ratio of the rotor relative to the inner eccentric shaft, the inner eccentric shaft relative to the output shaft and the output shaft relative to a fixed cylinder body is 3:-6:4. The rotor is nearly of an elliptical shape; the elliptical rotor sways in a three-arc cylinder and divides an inner cavity of the cylinder into two working chambers with variable cubage; and the rotor sways six times to just complete one circle of autorotation.

The invention relates to a Y-shaped ventilation method, which comprises the following steps of: A. when tunneling at a gate road of a mining face, combining the gate road and retaining roadways along a goaf and tunneling, and building 'concrete pier columns in the roadways' therebetween; B. after finishing digging a through cut, digging the gate road and the through cut at the mining face in the next section; C. after starting stopping, building a 'separation wall' between the concrete pier columns with the propelling of the mining face to separate the goaf; and D. when the mining face stopes, accessing fresh air flow in two paths, wherein in one path, the air is accessed from the gate road of the mining face and is exhausted to the lower outlet of the mining face through the mining face; and in the other path, the air is accessed from the gate road of the mining face and one side of a mining stopping line in the retaining roadways to join with the lack air flow of the mining face at the lower outlet of the mining face; and the lack air flow comes to a return airway of the mining area through the lower outlet of the mining face to the separation of the pier columns, the separation wall sections of the retaining roadways, the next section through cut and the gate road and the retaining roadways to finish Y-shaped ventilation. In the invention, the method of new retaining roadways along the goaf, namely gate road and retaining roadways are combined to tunnel the concrete pier columns support and protection in the arranged roadways, thus, Y-shaped ventilation can be realized, coal dust can be reduced, ventilation quality can be improved and the temperature can be reduced. And the method is particularly suitable for the coal mines with high-temperature and high gas.