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

The invention relates to a poking wheel type air quantity adjustable air window which has a simple structure and is convenient to use. The air window comprises a barrel, wherein a dial is fixedly connected outside the barrel and is provided with scales; a fixing sheet is fixedly connected in the barrel; an adjusting sheet and a transmission rod are arranged on the fixing sheet in a relatively rotating mode; one end of the transmission rod is fixedly connected with a poking wheel, and the other end of the transmission rod is fixedly connected with a worm; the poking wheel is positioned outside the barrel; the adjusting sheet is fixedly provided with a worm wheel; the worm wheel is meshed with the worm; the shape of the fixing sheet is the same as that of the adjusting sheet; the fixing sheet has a fan blade shape; and indicating arrows are arranged on the adjusting sheet and correspond to the scales on the dial. The air window is used in the technical field of mine ventilation, can conveniently and quickly adjust the air quantity of ventilation structures such as an air retaining wall, an air door and the like, more reasonably distributes air, improves ventilation quality and the labor condition of staff, has a simple structure and is convenient to use.

The invention discloses a cylinder liner for a two-stroke opposed-piston internal combustion engine, which comprises an opposed cylinder liner body. The opposed cylinder liner body is provided with two opposed The outer wall of the position between the opposing chambers is provided with an air inlet communicating with it, and the outer wall of the opposing cylinder liner body is provided with an exhaust port communicating with the corresponding opposing chamber; The outer wall of the opposed cavity is provided with an air inlet communicating with the corresponding opposed cavity, and the outer wall of the opposed cylinder body between the two opposed cavities is provided with an exhaust port communicated with it. The cylinder liner has the advantages of high gas exchange quality, can improve the oil-gas mixing effect of the combustion chamber, and can improve efficiency.

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 discloses a high compression ratio two-stroke gasoline compression ignition device and a control method. The stroke length of an air cylinder of the device is 90mm-110mm; a fuel injector and an electric heating plug are separately mounted on the top of the air cylinder; five scavenging ducts are separately formed in the side wall of a crankcase; the lower port of each scavenging duct communicates with the crankcase and communicates with the gas cylinder; a scavenging duct valve is mounted at the lower port of the fifth scavenging duct; a gas inlet is formed in the side wall of the crankcase, and a gas inlet pipe communicates with the crankcase; a gas compressor, a gas inlet control valve, an intercooler and a reed valve are successively mounted on the gas inlet pipe along the gas inlet direction; one end of a gas inlet by-pass pipe is connected to a gas inlet pipe between a turbine motor and the intercooler while the other end is connected to a gas inlet pipe between the intercooler and the reed valve; and an exhaust recycling pipe communicates between the outlet port of an exhaust pipe and the inlet port of the gas inlet pipe. The power is improved, and the oil consumption and discharge are reduced.

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.

The invention provides a two-stroke reciprocating engine without a crankshaft. The engine uses the relative motion of a cylindrical cam groove and a piston roller to complete the conversion between reciprocating motion and rotary motion. Compared with the crankshaft connecting rod mechanism, the utility model has the advantages of fewer parts, simple structure, flexible combination, convenient maintenance, and the inherent dumping moment of the crankshaft connecting rod mechanism can be eliminated. This design also adopts an offset swing exhaust valve. The exhaust port and exhaust channel are located on one side of the cylinder center. Direction of scavenging air flow. This design makes full use of the scavenging kinetic energy to improve the quality of air exchange. At the same time, it can flexibly arrange the fuel injector or spark plug, improve the oil mist distribution and ignition quality, and improve the combustion effect. Because there is no limitation of the crankshaft, multiple engines can be flexibly arranged, merged or disassembled, and the ignition interval can be adjusted to achieve smooth and efficient operation.