Pump definition and history source

A machine that delivers or pressurizes liquids. In a broad sense, a pump is a machine that carries or pressurizes a fluid, including some that convey gas. The pump transmits the energy of the prime mover's mechanical energy or other energy to the liquid to increase the energy of the liquid. Water lifting is very important for human life and production. There are various types of water-lifting appliances in ancient times such as the Egyptian chain pump (formerly 17th century), China's orange cake (former 17th century), the potter's wheel (formerly 11th century), waterwheel (1st century AD) and 3rd century BC Ancient Greece Archimedes invented the spiral rod and so on. About 200 BC, the ancient Greek craftsman Kate Sibius invented the most primitive piston pump - fire pump. As early as 1588, there was a record of 4-vane vane pumps, and various other rotary pumps appeared one after another. In 1689, France's D. Papan invented a 4-bladed impeller centrifugal pump. In 1818, the United States appeared with a radial straight blade, half-open double suction impeller and volute centrifugal pump. 1840 ~ 1850, the United States HR Worthington invented the pump cylinder and steam cylinder direct action opposite the piston pump, marking the formation of the modern piston pump. From 1851 to 1875, multistage centrifugal pumps with guide vanes were successively invented, making it possible to develop high-lift centrifugal pumps. Subsequently, a variety of pumps have come out. With the application of various advanced technologies, the efficiency of the pump is gradually increased, and the performance range and application are also gradually expanding.

Elevator Door Modernization

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Neglecting elevator door equipment jeopardizes riding public safety and increases owner liability. Modernizing elevator door equipment is important in making an older elevator system more reliable, safe, code compliant, efficient, and provides a more marketable appearance. This is particularly true with door operators. Door operators undergo tremendous wear and tear in daily operation. Each time the elevator stops, the door operators are activated at least two times, more frequently if occupants manually hold the doors open. Some elevator maintenance companies report that nearly 75 percent of their service calls are for malfunctioning door operators

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