Intergrated Led Emergency Modules The Intergrated Led Emergency Modules is match the compact LED fittings to improve the emergency function. Normally it is workable for small wattage from 3-60W LED panels, downlights, led tubes, tri-proof ceilings. Full power output or half power emergency output is optional. Customized emergency lighting time is available. Automatic lighting up when main power failures. Widely using for home, parking lot, office, building, warehouse, school, hospital, workshop etc. Emergency Light Module,Emergency Led Flasher Module,Led Emergency Modules,Intergrated Led,led light with emergency battery Foshan Nai An Lighting Electric Co.,ltd , https://www.ledpowerpack.com
Basis and conditions (1) the system of vacuum requirements According to the system of vacuum requirements, select the corresponding ultimate vacuum pump. The general requirements of the pump ultimate vacuum than the system requirements of the ultimate high vacuum 0.5 to 1 order of magnitude. (2) The pressure range when the system is working normally The pressure range that the pump needs to work normally must satisfy the working pressure required by the system. (3) Exhausted gases, composition, impurities and restrictions on the system when the work requirements Pollutants are pumping properties and pollution requirements is to choose a different vacuum pump an important condition. It not only with the performance of the pump at work, but also directly related to the working life of the pump and maintenance conditions, especially in chemical production, it is often the right pump is a key factor. (4) system is pumping volume or volume flow It is decided to choose a ~ type vacuum pump is the main basis. Vacuum pump selection and pumping speed calculation (1) Calculate the effective pumping speed of the vacuum pump S (L / s). According to the working pressure of the vacuum system Pg the total gas volume of the vacuum system Q, calculate the pump effective pumping speed, Q is the total gas volume of the vacuum pump system, Pa.g / s, including the amount of gas generated during the operation of the vacuum system , The amount of deflation in the vacuum system and vacuum components, and the total amount of blow-by in the vacuum system. Usually calculated according to this formula to increase the effective pumping speed S 20% to 30% or more as the nominal pumping speed of the main pump. (2) to determine the pumping speed of the vacuum pump. According to the effective pumping speed S and the connection between the pump and the vacuum chamber, the guiding pipe U determines the pumping speed Sq of the main pump by the conductance series formula. (3) According to the type, composition and temperature of the gas to be drawn and the impurities Select the vacuum pump. (4) According to the vacuum chamber of the oil pollution requirements of different, to choose oil, oil-free, semi-oil-free, dry, wet vacuum pump. Dry vacuum pumps are ideal for applications that require absolutely no oil or working fluid, or are concerned about the cost of working fluid storage and handling. (5) According to the investment and daily maintenance of economic indicators to choose. 3. Pre-stage pump configuration and pumping speed to determine After the selection of the main vacuum pump, how to configure the fore-stage pump, the principles to be observed are: â‘ pre-stage pump required to cause the main vacuum pump pre-vacuum conditions required; â‘¡ pumping away the main vacuum pump The maximum amount of gas; â‘¢ must meet the main vacuum pump inlet can work at the maximum pressure required pre-pumping time requirements. Different main vacuum pump, its front-stage pump configuration varies, are as follows. (1) steam flow pump pre-configuration Such pumps include oil diffusion pump, oil diffusion jet pump and expansion pump. In the main pump to allow the maximum exhaust pressure, the first stage pump to be the main pump to produce the maximum amount of gas in time to take away, that is, the effective pumping speed of the foreline pump group silk Sq- Speed, L / s, and select a high vacuum pump, first by the Sq to determine the pumping speed of the foreline pump, and then select the pump type based on the pumping speed; Pn - the main pump before the critical level before the pressure, Pa; Qmax - the maximum amount of gas the main pump can discharge, Pa.L / s; pg - the maximum allowable working pressure of the main pump, Pa; S - the main pump operates at P. When the effective pumping speed, L / s. When selecting a foreline pump, care should be taken that the pumping speed of the mechanical pump is measured at atmospheric pressure, but normally used pumps operate at subatmospheric pressure and pump pumping speed drops, so we must Select the pump based on the pumping speed curve. You may also be interested in Magnetic Pump, High Temperature Magnetic Pump, Stainless Steel Magnetic Pump, Pipeline Pump, Vertical Pipeline Pump, Horizontal Pipeline Pump, Pneumatic Diaphragm Pump, Electric Diaphragm Pump, etc. Welcome!