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The invention of the pump dates back to antiquity. The first pump for fighting fires, a mechanic who invented the ancient Ktesiby was described in 1. bc. er. Ancient Greek scientists Heron of Alexandria in his work Pneumatica, and then M. Vitruvius in his work De Architectura.

Simple wooden pumps with a through piston for lifting water from wells, probably used even earlier. Prior to the 18 century. Piston pumps, compared with water-lifting machines were rarely used. In the future due to rising water demand and the need to increase the height of its filing, especially after the steam machines, pumps have gradually displace the water-lifting machine. Requirements to them and their conditions applications become more diverse, so along with piston pumps are rotary pumps to create, as well as various devices for pressurized fluid. Thus, historically, there have been three direction for their future development: establishment of piston pumps, rotational, hydraulic devices with no moving working parts. The rise in the development of reciprocating pumps observed in the late 18 century.

When to make them began to apply the metal and use the drive from the steam engine. Since the mid 19 century. have been widely implemented in the production of steam Self-acting piston pumps. This period is the creation of vane pumps, the prototype of which is the piston with an annular cylinder, described the French engineer A. Ramello in 1588 (Le diverse et articiose machine). Development of the theory of piston pumps is closely linked with the work of local scientists and engineers (C.

As a result of uneven heating of the metal concentrated source of heat in a welded structure having welding voltage – time and residual. Temporary welding voltage are valid only during the period welding when the temperature of welded metal. Voltage remaining in the metal after welding and complete cooling design, called the residual welding stresses. They arise from constrained thermal expansion and constrained shrinkage of metal during its heating and cooling. This constraint is due to the fact that the locally heated area of welding on all sides surrounded by the cold metal.

Additional fixing the workpiece (in the adaptation, with rigidly fixed) also interferes with normal processes of thermal expansion and shrinkage, and there are reactive residual stresses. When welding alloys with polymorphic transformations in parts of the welded joint metal, heated above the critical point, there are structural stresses. For example, when welding hardenable steels, heat-affected zone which martensite is formed with a large volume effect of transformation, the structural stresses reach high values. Distinguish three types of welding voltage. In welded structures of carbon and low-alloy steels are driven primarily by welding voltage of the first kind.

They are balanced and in amounts commensurate with the size or design of its individual parts. Welding voltage of the second and and third kinds are balanced within the microvolume and the individual grains of the metal. Depending on the direction of action in space distinguish welding voltage linear, or uniaxial, acting only on one axis, planar, or two-axle, acting in two mutually perpendicular directions, volumetric, or three-axle, acting in three mutually perpendicular directions. Direction of the action with respect to the axis cross stitch welding voltage different from the longitudinal. Technology, assembly and welding of structures should be tailored to ensure that the minimum values of welding voltage and when it is dictated by terms of design, include the removal of these stresses. If the values of welding stresses reach the yield point of the metal, then there is its plastic deformation, ie change the size and shape welded construction, called the warp. Arising during welding deformation is divided into time to develop only during the welding of the structure, and residues that remain after the welding and cooling design. Depending on the nature, form and size of the workpiece residual welding deformations are developed "in-plane" and go "out of the plane" of connected elements. Deformation "in the plane" appears in Change (decrease) the size of design, with what must be considered when cutting parts and assembly welding, providing allowance for resizing. Deformation "of the plane (angular deformation) occurs in Education bulge (hlopunov "), the local bending of sheets, the so-called mushroom bending zone during welding of elements of T-and I-sections, as well as other changes in forms of products. The magnitude and nature of residual strains are highly dependent on the thickness and properties of base metal, welding conditions, weld shape, consistency of their performance, design of welded parts. In developing the technology and build weld design should aim to reduce the residual strain. If the value of residual strain goes beyond tolerance, it involves editing the structure.

Who benefits can only guess. Especially considering that the plant will be built until a single copy, as a result of cooperation with China. Of course, this plant can not provide all the needs Russian consumers. By some estimates, it requires at least 60 such plants, given that consumer demand for energy-saving bulbs will grow over time. In the meantime, energy-saving bulbs do not enjoy particularly strong demand, primarily because of its high cost, even if savings (compared to an incandescent lamp) on the acquisition of the lamp will exceed its cost of lamp several times.

With some accuracy, we can predict the high cost of energy saving lamps, made in Russia, even by Chinese technology. Isearch has many thoughts on the issue. Therefore, for a long time will be much more profitable to import lamps energy from China, for which the price even taking into account customs duties will be lower prices for Russian counterparts. Compare as there is no sense, since the Russian tubes are also produced at the plant, built Chinese. I can tell you that the label "Made in China" nothing said, but unfortunately misleading about the quality of Chinese goods are still very common among Russian consumers, who judge on goods purchased at commodity markets.

The main application area of industrial heaters families 'ThermoRang 8,5' – this is a low-temperature heating units of production machines: material cylinders termoplastoavtomatov, extruders, preliminary and operating the heating molds, including hot runner, etc. The main consumers of our heaters are the manufacturers of the equipment and maintenance service of large industrial enterprises with a most cases, high-quality and high performance imported equipment operating in two – three shifts. Get more background information with materials from altavista. Because of the above equipment is used in large scale and mass production, where time lost because of problems are very expensive, it puts special demands on the reliability of all units, including and heaters. Therefore, reliability, develops and distributes products' Belterm "attached special significance. Each newly created model heater is placed on production only after the endurance test and confirm the reliability parameters. The second feature of the establishment of industrial heaters families 'ThermoRang 8,5', is the lack of restrictions on the range, quantity and timing of production. Number of modifications of the heaters being developed within a month, could run into thousands of pieces, and the term production may be one day.

In this case the supply voltage can vary from 12 to 1000, the diameters of the ring (Semiring) heaters – 25 to 1000 mm or more heaters may be complicating elements: the grooves, notches, holes, disclosed for mounting on a heated object, etc. In spite of this, each heater has a full set of technical documentation, enabling him to produce and control the quality of manufacturing. The prices for Heaters family 'ThermoRang 8,5' remain lower than those of competitors, and the quality higher. This was made possible by the introduction of computer aided design (CAD), allowing for all of the requirements normative and technical documentation, and reduce errors in the design of the heaters, as well as to minimize the difference in price between serial and single samples. Third feature of the establishment industrial heaters families' ThermoRang 8,5 "is the constant improvement of technological level of production and creating new designs.

Because the market is saturated with industrial heaters, both domestic and foreign suppliers, then no innovation in this area rely on the long term is impossible. Therefore, the creation and innovation 'Belterm pays special attention. The fourth feature of the establishment industrial heaters families' ThermoRang 8,5 "is the constant enhancement of technological capabilities that allow improve quality and innovate. Achieved our current level of technology allows produce winding resistance elements on the ring frames (Clamp, lip, Obruchev) heaters with step 0.1 mm, and heat flux with heat transfer surface heaters with insulators on the basis of mica reaches the world level – 8,5 W / cm. square. The quality of the inner surface of the annular heater ensures virtually perfect fit cylindrical heat transfer surfaces. Today 'Belterm "accumulated extensive experience creating heaters, allows us to produce industrial heaters of almost any complexity and for any equipment, including import, but at much lower prices.

One of the most promising materials for the current moment it becomes concrete cellular structure. Artificially manufactured building material, what is cellular concrete, created by the latest The technology combines mineral-type binder and a component of silica. To ensure proper internal cellular structure of the building material is involved special equipment. Basis binder component of cellular concrete in different cases could be building cement, lime or standard industrial gypsum. With regard to disperse the filler, more often in such works as the sand. To broaden your perception, visit isearch.

Today the technology of production of aerated concrete quality tested and allows you to create a reliable building material, whose main features, besides reliability and long service life, are also Sound Attenuated significant characteristics, as well as thermal insulation. Dwelling houses, built of aerated concrete, are save heat, so much nicer for homeowners. To date, there are two the form of concrete cellular nature: foam and aerated concrete. Methodology for their creation in some way different: thus, for foam used specific compounds that are referred to as blowing agent. On the other hand, the production of aerated concrete is ensured through the introduction of the aluminum powder. As a result, the active chemical reaction between aluminum powder and an alkaline composition of concrete by product of hydrogen, using which form an unusual porous internal structure of concrete. Since the aerated concrete is involved for a variety of implementation options, it can be divided into different groups by the degree of compaction.

This so-called structural cellular concrete, the average density of which ranges from 900 to 1. 200 kg/m3, more is structurally insulating cellular concrete with a density of 500 to 900 kg/m3 and heat-insulated aerated concrete – up to 500 kg/m3. Gazobeton very first subgroup is activated for the formation of large-scale concrete structures, the next – for all kinds of form over fences, but what do against heat-shielding materials of aerated concrete, they are performing functions more decorative. Today aerated is a very durable material, much of this going around on its own technical characteristics of foam concrete. Not counting the aerated structure easily later can handle a simple plaster. Modern equipment for aerated concrete is a specific mixer for cellular concrete bowl which is filled with a mixture of cells possessing, and along with a device for cutting the main mass into smaller units. Today is just the creation of non-autoclaved aerated concrete is a list of the most profitable attractive areas of construction.