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The inverter transformers are used to step up the voltage of the AC supply network. By using a star-delta connection, the inverter can operate with 12 pulses in each cycle of the AC supply, which eliminates numerous harmonic current components. The insulation of the transformer windings must be specially designed to withstand a large DC potential to earth. Inverter transformers can be built as large as 300 MVA as a single unit. It is impractical to transport larger transformers so when larger ratings are required, several individual transformers are connected together. Either two three-phase units or three single-phase units can be used. With the latter variant only one type of transformer is used, making the supply of a spare transformer more economical. Inverter transformers operate with high flux densities, and so produce more acoustic noise than normal three-phase power transformers. This effect should be considered in the siting of an HVDC static inverter plant. Noise-reducing enclosures may be applied.
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Inverting filter centrifuge is mainly used for solid-liquid separations. This system incorporates the attributes of both fast action centrifuges and filter press systems. It is widely applied in pharmaceuticals, fine chemicals, and special chemicals. It comprises of a filter drum that is rotatably mounted in a machine frame and projects in a cantilevered manner into a housing that is connected to the machine frame, said drum radially surrounding a centrifugal chamber that can be subjected to an excess or negative pressure. The centrifugal chamber is sealed on one end face by a centrifugal chamber cover and on the other face by a sliding base. The filter drum, the centrifugal chamber cover and the sliding base, together with a sliding shaft that is connected in a fixed manner to the latter are driven by a hollow shaft that causes them to rotate in unison. The filter drum and the sliding base are moved in relation to one another by an axial displacement of the sliding shaft, said action inverting a filter cloth and discharging the separated solid matter from the centrifugal chamber.
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Investment Cast Burn Out Furnace is designed for maximum efficiency and ensures cleaner shells with less smoke because of its unique automatic air injection system. It operates at maximum heat-up rates and minimum fuel costs. The temperature range is up to 2000°F. This is featured with vacuum-formed, ceramic fiber insulation, efficient, high-energy combustion, castable refractory hearth and automatic air injection system. This is used in preheating and wax burn off process. The full chamber opening is used for easy loading.
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Investment casting is a type of metal forming techniques. It is suitable for repeatable production of net shape components, from a variety of different metals and high performance alloys. Although generally used for small castings, this process has been used to produce complete aircraft door frames, with steel castings of up to 300 kg and aluminium castings of up to 30 kg. Compared to other casting processes such as die casting or sand casting it can be an expensive process, however the components that can be produced using investment casting can incorporate intricate contours, and in most cases the components are cast near net shape, so requiring little or no rework once cast.
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Involute Gear Cutters are designed to cut a range of gear-tooth numbers. These cutters are manufactured in many pitch sizes and shapes for different numbers of teeth per gear.
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