Hot oil pump packing seals and mechanical seals used a combination of form, fill seal packing with high temperature resistance, good thermal adaptation, while the mechanical seal is applied and high mechanical strength, good wear resistance carbide materials, ensuring heat-conducting oil pump sealing performance under high temperature condition. Heat-conducting oil pump is the use of machinery, physics, chemistry, physics, chemistry, container extraction methods to obtain and maintain the vacuum device. From the structure of vacuum pumps can be broadly divided into: reciprocating vacuum pumps, rotary vacuum pumps and jet pumps and so on. Reciprocating pump for pumping does not contain solid particles, non-corrosive gases. This vacuum pump exhaust rate of larger, high vacuum. It is widely used in chemical plants. But its complex structure, large amount of maintenance. Water-ring vacuum pump is a rotary vacuum pump, circulating water pumps are widely used in evaporative distillation, crystallization, filtration, vacuum, distillation and other operations, low-temperature cooling circulating water pump is a vacuum pump and low-temperature cooling pump combination. That can vacuum, but also can provide low-temperature cooling circulating water and vacuum distillation and vacuum concentration is a good auxiliary equipment, in particular, with a rotary evaporator to adapt, not only is the use of jet pumps work of a high pressure fluid for the transmission of another a fluid. By the heat pump and jet pump (or injectors) a combination of relying on jet device, create a vacuum in the nozzle to achieve suction. Reduced the use of space, but also reduces the degree of vacuum, saving water resources, a wide range of modern laboratory equipment. Hydraulic jet pump is a kind of vacuum, condensation, drainage and other three kinds of mechanical devices can be effective. It is the pressure flow of water through the use of a certain symmetry uniform slope of the nozzle spray into the meal, a focus on aggregate. As the shock of high velocity jet of water, so the formation of negative pressure around the room to create a vacuum device and another due to the secondary steam and water jet direct contact heat exchange vast majority of the steam condensed into water, a small amount of steam is not condensed and non - condensation of gas is also due to the flow of water spraying each other with high-speed friction, mixing and extrusion, through the diffuser tube are excluded, asphalt pump device indoors to make the formation of a higher vacuum.