How do vane pumps work?
A vane pump includes a cylindrically-shaped rotor turning about its centerline inside of an asymmetrically- shaped casing. The cylindrical rotor has a number of rectangle shaped slots running linearly along the outside of the cylinder. As the cylindrical rotor turns, centrifugal force causes the vanes to move outward, such that the outer edge of the vane stays in touch with the inside surface of the asymmetrically-shaped casing. Like many rotary pumps, the direction of flow can be reversed by reversing the direction of rotation of the pump.
Figures of:
Diagrammatic reciprocating displacement pump
Rotary displacement pumps: (a) rotary vane displacement pump, (b) screw displacement pump.
A
xial-flow
pump
Centrifugal pump operation
Single-entry centrifugal pump
Double-entry
centrifugal pump
Unit one. Auxiliaries words and expressions
auxiliaries heat exchanger distillation equipment bilge water sewage treatment plant
incinerator to range multi-stage crank second stage piston assembly first stage cooler tubes first stage drain second stage drain steady reading moisture to clear reciprocating machinery troublesome rapid to reface
incorrect dirt to stick to pit to strip to lap reassembly seal |
вспомогательные двигатели теплообменник опреснительное оборудование льяльные воды, сточные воды установка для обработки сточно-фекальных вод инсинератор колебаться (от) многоступенчатый кривошип поршневой блок второй ступени охладитель первой ступени клапан продувания первой ступени клапан продувания второй ступени устойчивое показание (прибора) влага очищать поршневые механизмы причиняющий беспокойство быстрый зд: восстанавливать поверхность (притиранием) неправильный зд: нерекомендованный грязь зд: заклинивать подвергаться язвенной коррозии разбирать шлифовать повторная сборка герметичность |
TEXT
Machinery other than the main propulsion unit is usually called auxiliary. These include the following: air compressors, heat exchangers, distillation equipment, oil / bilge water separators, sewage treatment plants and incinerators.
Air compressor
Compressed air has many uses on board ship ranging from diesel engine starting to the cleaning of machinery during maintenance. The air pressures of 25 bar or more are usually provided in multi-stage machines. Here the air is compressed in the first stage, cooled and compressed to a higher pressure in the next stage and so on. The most common is two-stage crank machine.
(Figure 4.1 Two-stage compressor, p. )