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      carbide rod selection

      1. Calculation of surface load density of silicon carbide rods:

      The surface load density of silicon carbide rod refers to the electric power that the heating part of the rod bears in use per unit surface area, namely: surface load

      Density= Under the same furnace temperature, if the unit surface load density of the rod is large, the service life of the rod will be short.
      Therefore, avoid overloading. The load density has the following relationship with furnace temperature and rod surface temperature:
      The correct selection of surface load density is an important way to rationally use silicon carbide rods and extend the life of the rods. The following shows the maximum allowable surface load density reference value of the silicon carbide rod under different furnace temperatures when the surface is at the rated use temperature.
      Rod surface temperature Furnace temperature ℃ Allowable maximum load W/Cm 2
      1450°C 1000 31
      1100 twenty four
      1200 twenty one
      1250 18
      1300 14
      1350 10
      1400 6

      2. Selection of silicon carbide rod specifications and calculation of required counts:

      The selection of silicon carbide rod specifications should mainly meet the requirements of electric furnace structure size, furnace power, furnace temperature and temperature field distribution, etc., and pay attention to the external wiring and power adjustment when using it. The number of silicon carbide rods required can be calculated by the following calculation: After the specification is determined, the load power number of each rod is:
      1 =F*W (watts)
      F-surface area of heating part of each rod (Cm 2 )
      W- in calculation The allowable load density (W/Cm 2 ) of the heating part at the furnace temperature
      needs count:

               P --- Furnace power
         U --- Terminal voltage of series branch (V) u --- Voltage of each rod (V)
      Voltage of each rod:
         R- the nominal resistance value of a single rod.

      3. Selection of power supply equipment and connection method of silicon carbide rods:

      The power supply equipment is best to choose equipment with a large voltage regulation range and stable and continuous voltage regulation, such as magnetic voltage regulator, thyristor AC and DC voltage regulator, etc. If you choose a stepped regulating transformer, you should also choose a transformer with a small voltage difference and a large number of regulating gears. The connection mode of the silicon carbide rod elements can be connected in series or in parallel, preferably in parallel. When used in series, the number of branches in series should not be more than 3.

      我和表妺洗澡好紧作爱视频,我和亲妺在客厅作爱视频网站,护士表妺好紧竟然流水视频