3 results about "Overpressure" patented technology

Methods for manufacturing a plastic container and for filling it with a fill product are described. The methods include introducing a perform into a blow mold, pressuring the preform with a blowing medium, evacuating the interior space of the container to an underpressure, and introducing a fill product in the interior space at an overpressure.

The invention discloses a vehicle overpressure and negative pressure filtering and purifying comprehensive protection system, realizing the overpressure protection of carriage and negative pressure protection of carriage van-type vehicle, which comprises an overpressure protection device, a negative pressure protection device and a protection control device; the overpressure protection device is fixed in a compartment at left-front part of carriage, which comprises a fan, a filter absorber, a collecting tank, a cab blast pipe, a carriage blast pipe and an air volume adjusting valve; the negative pressure protection device is fixed on the floor of the carriage, which comprises a casing, a second high efficient filter, a high efficient filter, a centrifugal fan, an electric butterfly valve, an air exhausting flange, an ultraviolet lamp and a protective gate. The vehicle overpressure and negative pressure filtering and purifying comprehensive protection system has the advantages that the van-type vehicle can safely pass though biologic pollution area, and protect the environment on the way from pollution when biologic pollution sick and wounded or biologic pollutant are conveyed.

The invention discloses a centrifugal pump with the variable impeller width. The centrifugal pump comprises a centrifugal pump body, an inlet sealing ring, an impeller mounting seat, connecting lug plates and a sealing sleeve. The inlet sealing ring is arranged in the centrifugal pump body. A water inlet is formed in the upper portion of the inlet sealing ring. The impeller mounting seat is arranged on the other side of the inlet sealing ring. A pump transmission shaft is mounted on one side of the impeller mounting seat. A flat key is arranged between the impeller mounting seat and the pump transmission shaft. A water outlet is formed in the top of the centrifugal pump body. The connecting lug plates are mounted on the two sides of the water outlet. An O-shaped sealing ring is mounted onone side of the pump transmission shaft. The sealing sleeve is mounted on one side of the O-shaped sealing ring. The centrifugal pump has the beneficial effects that by arranging a fixed impeller anda movable impeller, the width of the impellers can be adjusted according to the use situation, and using is convenient; and the flow and pressure of water in the centrifugal pump can be monitored in real time, and the centrifugal pump is prevented from being damaged due to overpressure.