A chiller is a machine that achieves refrigeration by steam compression or absorption cycles. These liquids can flow through the heat exchanger to cool the air or equipment. The steam compression chiller consists of four main components of a vapor compression refrigeration cycle (compressor, evaporator, condenser, part metering device) that can implement different refrigerants. The refrigerant used in the absorption refrigerating machine and the benign silica gel used in the city as a desiccant. Absorption chillers use water as a refrigerant and rely on water and lithium bromide solution to achieve a strong affinity for refrigeration. In most cases, pure water is chilled, but water may also contain a percentage of ethylene glycol and/or corrosion inhibitors; for example, thin oils can be chilled and other liquids.
As a mechanical hardware, chillers are widely used in many fields: chillers are used in plastic processing machinery to form mold cooling, which can greatly improve the surface finish of plastic products, reduce the surface marks and internal stress of plastic products, so that the products do not shrink, The deformation facilitates demolding of plastic products and accelerates product setting, thereby greatly improving the production efficiency of the plastic molding machine. The chiller is used in CNC machine tools, coordinate boring machines, grinding machines, machining centers, combination machine tools, and various types of precision machine tool spindle lubrication and hydraulic system transmission medium cooling, which can accurately control the oil temperature, effectively reduce the thermal deformation of the machine tool, and improve the machine tool. Processing accuracy. The chiller is also used in special industries such as medicine and chemical industry, and is also used in food processing and other industries.
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Label: A brief introduction to the chiller
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Ball valve is evolved from the plug valve, its opening and closing parts as a ball, using the ball to rotate 90 degrees around the axis of the stem to achieve the purpose of opening and closing, the difference is that the cock body is a ball, with a circular through hole or channel through its axis. The ratio of the sphere to the passageway should be such that when the ball is rotated 90 degrees, the inlet and outlet should be completely spherical, thus cutting off the flow.
The role of ball valve in the pipeline is mainly used to cut off, distribute and change the direction of media flow, designed into the V-shaped opening ball valve also has good flow regulation function.
Ball valve is not only simple in structure, good sealing performance, but also in a certain nominal range of small volume, light weight, less material consumption, small installation size, and driving torque is small, easy to operate, easy to realize rapid opening and closing, is one of the fastest developing valve varieties in recent decades. Especially in the United States, Japan, Germany, France, Italy, West, Britain and other industrial developed countries, ball valves are widely used, the variety and number of use is still continuing to expand, and to high temperature, high pressure, large mouth, high sealing, long life, excellent regulatory performance and a valve multifunctional direction, its reliability and other performance indicators have reached a higher level, And has partially replaced Gate Valve, Globe Valve, Regulating Valve.
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