Cryogenic pump mechanical seal and shaft seal features

Cryogenic pump is a special pump used to transport liquefied gas, such as liquid oxygen, liquefied natural gas and freezing liquid, liquid nitrogen in petroleum and chemical plants, so it is also called cryogenic system. Structure Features: 1. General Structure Features The vertical structure is suitable for underground installation and will not be affected by the hot air, air temperature and sunshine of the motor, so it is easy to keep cold; it can reduce the pump suction height, increase the perfusion head and increase the effective cavitation Margin; vertical structure is also conducive to exhaust, so that the suspension shaft has enough height to facilitate the installation of shaft seal device, so the pump is also known as vertical cylinder pump. The symmetrical structure of the overall structure of the pump strive to symmetrical arrangement, in order to uniform deformation in cold. Double-layer shell for the convenience of cold and conducive to the transport of dangerous medium, usually made of double shells, the inner shell to withstand pumping pressure, the pressure between the inner shell is suction, which may be appropriate to reduce the strength requirements of the inner shell. 2, shaft seal Packing different from the common type of common type, the use of double packing seal, with a sealed chamber between the two layers, the introduction of a gas (such as nitrogen) from the outside world, from the sealing effect. Mechanical seal is also different from the ordinary type, the use of double-ended mechanical seal, the buffer chamber between the seal chamber and the pump body, can play the role of cooling, while the seal fluid pressure to adapt to discharge pressure changes, for which general Equipped with a pressure device, cooling tank and other ancillary equipment. 3, the bearings on the bearings close to atmospheric temperature, the general use of thrust ball bearings; bearings for the sliding bearings, submerged in the working medium in operation and lubrication with the working medium; in order to prevent friction caused by heat and liquid vaporization, resulting in damage to lubrication, you must use Good lubricity materials, such as tetrafluoroethylene, graphite, corrosion-resistant nickel alloy; and journal bearings on the sliding bearing surface nitriding or surfacing cemented carbide.

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