Cryogenic seal pump is the application of thermodynamic principles, the method of artificial low temperature, the refrigerator and air conditioning are based on the principle of refrigeration. From a chemical point of view, it is common to use a high critical point of gas, liquefied, and then make it vaporized endothermic, repeated this process, when liquefied elsewhere in the exothermic, vaporization of the required range of endothermic Fully enclosed pump.
Cryogenic seal pump principle
Water lifting is very important for human life and production. In ancient times there were various kinds of water-lifting appliances such as chain pumps in Egypt (17th century BC), tangerines in China (17th century BC), pots and lanterns (11th century BC) and water tankers (1st century AD). More well-known also the third century BC Archimedes invented the spiral rod, the water can be smooth and continuous to a few meters high, the principle is still used by modern screw pumps.
Around 200 BC, the fire pump invented by the ancient Greek craftsman Kate Sibius was one of the most primitive piston pumps that already had the main components of a typical piston pump, but the piston pump developed rapidly only after the steam engine appeared . 1840 ~ 1850, the United States HR Worthington invented pump and steam cylinder opposite the direct effect of steam piston pump, marking the formation of the modern piston pump. The 19th century was the climax of piston pump development, when it was used in hydraulic presses and other machines. However, with the rapid increase in water demand, low-speed, heavily-restricted piston pumps have been gradually replaced by high-speed centrifugal and rotary pumps since the 1920s. However, in the field of high pressure and small flow, the reciprocating pump still occupies the main position, especially the diaphragm pump and the plunger pump have the advantages and applications.
The emergence of rotary pumps has been associated with the increasing diversification of industrial requirements for liquid transport. As early as 1588, there was a record of 4 vane vane pumps, and various other rotary pumps appeared one after another. However, until the 19th century, there were still some shortcomings such as large leakage, large wear and low efficiency. At the beginning of the 20th century, people solved the problem of rotor lubrication and sealing and adopted high-speed motor to drive. The rotary pump suitable for high pressure, medium and small flow and conveying various viscous liquids was rapidly developed. Rotary pump type and suitable for the type of liquid as many other types of pumps less than.
The idea of ​​using centrifugal force to feed water first appeared in the sketches made by Leonardo da Vinci. In 1689, the French physicist D. Papan invented a 4-bladed impeller centrifugal pump. But closer to modern centrifugal pumps are the so-called Massachusetts pumps with radial straight blades, half-open double-suction impellers and volutes that appeared in the United States in 1818. From 1851 to 1875, multistage centrifugal pumps with guide vanes were successively invented, making it possible to develop high-lift centrifugal pumps. Although as early as in 1754, the Swiss mathematician L. Euler proposed the basic equations of the impeller hydraulic machinery, laying the theoretical foundation for centrifugal pump design. However, until the advent of high-speed motors at the end of the nineteenth century, which made the centrifugal pump obtain the ideal power source, Its superiority can be brought into full play. On the basis of the theoretical research and practice of many scholars such as O. Reynolds in UK and K. Pfrederrell in Germany, the centrifugal pump has been greatly improved in efficiency and its range of performance and use has also been expanding. It has become a modern The most widely used, the largest production pump.
Frozen seal pump classification
In addition to the principle of pump classification, but also by other methods of classification and naming. For example, according to the driving method is divided into electric pump and water pump; according to the structure is divided into single-stage pump and multi-stage pump; according to the use is divided into boiler feed pump and metering pump; according to the nature of liquid delivery is divided into pumps, pumps And mud pump and so on.
Positive displacement pumps rely on working elements in the pump cylinder reciprocating or rotary motion, the work volume alternately increase and decrease in order to achieve liquid inhalation and discharge. Suction and discharge of positive displacement pumps are closely spaced. The reciprocating motion of the working elements of the positive displacement pump called the reciprocating pump, known as rotary motion rotary pump. The former suction and discharge processes alternate within the same pump cylinder and are controlled by the suction and discharge valves (Figure 1a). The latter forces the transfer of liquid from the suction side to the discharge side by the rotation of working elements such as gears (FIG. 1b), screws, leaf rotors (FIG. 1c) or vanes. They do not require suction and discharge valves. Radial rotary piston pump (Figure 1d) and axial rotary piston pump (Figure 1e) rely on the radial and axial piston disposed on a plurality of each plunger in the rotor during the reciprocating motion in the pump cylinder To complete the suction role, they can be seen as a special type of rotary pump.
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