2results about How to "Reduce particle pollution" patented technology

The application discloses a transformer for extra-high voltage direct current transmission engineering and relates to the technical field of transformers, in particular to a transformer for extra-high voltage direct current transmission engineering. The transformer comprises a transformer body, an oil tank arranged in the transformer body, a drain valve pipe communicated with the oil tank and mounted on one side of the transformer body, a main flow guide pipe connected with one end of the drain valve pipe, and a drain valve component and a sampling mechanism arranged at two ends of the main flow guide pipe. The transformer for extra-high voltage direct current transmission engineering is provided with the sampling mechanism. When sampling, the sampling pipe body is automatically moved up to the main flow guide pipe in an arc-shaped notch opened by itself and covered by a composite sealing ring under the transmission of the lifting transmission assembly, and then the clean oil sample in the main flow guide pipe enters the inside of the sampling pipe body along the cylinder wall of the sampling pipe body in a wall layer flow, so that air is avoided from being sucked by free jet flow. In the oil inlet process, the oil pressure pushes the piston rod in the buffer assembly to move down synchronously, and the gas in the sampling pipe body is discharged through the associated second electromagnetic valve pipe, so that the detection requirement of low-bubble sampling is met.

The utility model discloses a graphite disc cleaning device for improving the appearance of an epitaxial wafer, which belongs to the technical field of semiconductors, and can completely clean particulate matters which are attached to the surface of a graphite disc and are not easy to blow off through the blowing of high-pressure nitrogen and the cleaning of a brush rotating at a high speed, reduce the particle pollution of an epitaxial layer and improve the appearance yield. The device mainly comprises a machine table, a table plate is arranged on the machine table, a fixing frame is arranged on the machine table, a brush motor is arranged on the fixing frame, an output shaft of the brush motor is connected with a brush frame, a plurality of brush heads are arranged on the brush frame, the brush heads are located above the table plate, a dust cover is arranged in the area above the machine table, a nitrogen pipe is inserted into the dust cover, and a jet head is arranged at the end of the nitrogen pipe. The jet head is positioned above the center of the bedplate; a plurality of negative pressure exhaust holes are formed in a platen of the machine table, an exhaust cavity is formed below the platen, the negative pressure exhaust holes are communicated with the exhaust cavity, and the exhaust cavity is connected with an exhaust pipe. The graphite disc cleaning device is mainly used for cleaning graphite discs.