As people raise awareness of fire and improve the fire code, diesel fire pumps are more and more customers. And because of its complete automation control cabinet function, so that the diesel engine start-up and operation completely out of the traditional mode of operation, to achieve a remote control, automatic start, low pressure pump and start the function of automatic alarm. Since the operation of the electric water pump is inseparable from electricity, and the scene of the fire accidents are often forced to cut off the power or the power to shut down by fire, even if we have a dual power switching device does not ensure that the power grid must be normal when the fire alarm signal. As a result, a diesel fire pump that is fully operational and disconnected from the grid becomes the equipment of choice for a backup fire service! As we all know, diesel fire pump drive power and electric pump drive power is very different, so their routine maintenance and management are also many differences! Here I will talk about diesel fire pump routine maintenance and management should pay attention to the matter. 1, the characteristics of diesel fire pump Diesel fire pump and electric pump is the biggest difference is that it has its own independent power supply system - battery, therefore, diesel fire pump start and run completely disconnect from the electricity. Diesel engine fire pumps are usually used as a backup facility and are therefore activated automatically only when there is a fire signal and the electric water pump is in trouble or the power is lost. When it is equipped with ultra-low pressure pump device, with its supporting electric pump control cabinet, there should be ultra low pressure pump device, and both the pump should have a lower pressure drop. Of course, I can also design a more suitable control system according to the customer's requirements. 2, diesel fire pump maintenance diesel fire pump proper maintenance, especially preventive maintenance, is the easiest and most economical maintenance, it is to extend the service life and reduce the cost of the key. Routine Maintenance Check the amount of fuel in the fuel tank as follows - observe the amount of oil in the fuel tank and add as needed. Check the oil pan oil plane - Observe whether the oil level reaches the marking mark on the oil dipstick. When it is insufficient, add a specified amount, but it can not exceed the upper limit of the scale ruler. Check fuel pump governor oil level - If sufficient markings have not been achieved, add sufficient oil (there is no gauge on the fuel pump governor to eliminate this step). Check whether there is enough lubricating grease in the pump oil filling point - Remove the grease nipple on the diesel circulating pump and observe whether the lubricating grease inside is sufficient. If there is not enough grease, inject grease enough into the pump. Check if the water in the water tank is adequate - find out the water in the water tank should be replenished promptly. The added water should be clean fresh water, such as tap water or clean water. If the direct use of groundwater, easy to form scale in the tank, affecting the cooling effect caused by failure, therefore, groundwater softened before use. In the north (ambient temperature below zero), a suitable freezing point must be configured according to the local minimum temperature. The formula is as follows: Glycol Water Point ℃ Ethylene Glycol Antifreeze 60 40 -55 55 45 -40 50 50 - 32 40 60 -22 Check the three leaks (water, oil and gas) - Check the sealing surface of the oil pipe, water pipe joints, and found to have leakage, should be immediately addressed; If the exhaust pipe, cylinder head gasket at the supercharger Loose or leaking, it should be promptly ruled out. Check the battery acid - the level of electrolyte in the battery should generally be above the top of the plate 10 ~ 15mm, unusual abnormalities should be added to the proportion of 1.400g / cm³ dilute sulfuric acid or distilled water to adjust to The proportion of 1.280 ± 0.005 (30 ℃). Avoid filling the river, well water and concentrated sulfuric acid. Check the installation of the accessories of the diesel engine - including the degree of stability of each accessory installation, the anchor screws and the connection with the working machinery firmness. Check the injection pump drive plate - Check the connection screws are loose, if loose, should be re-calibration injection advance, and tighten the connection screws. Clean Diesel Engine and Ancillary Equipment Exterior - Use a dry cloth or diesel oil-impregnated cloth to remove grease, water and dust on the surface of the body, turbocharger, cylinder head cover, air purifier, etc. Clean or compress Air blowing clean charging generators, radiators, fans and other dust on the surface. 3, diesel fire pump start preparation Diesel fire pump in the structure is much more complex than the electric pump, so the preparatory work before the start is also more complicated. First, we should first check the voltage on the control cabinet display is 24V, if less than 24V, should promptly identify the cause, troubleshooting. Second, check whether the normal part of the diesel engine, the attachment is reliable, and exclude the anomalies. Third, check the oil pan, the fuel pump and the governor within the oil to achieve the required oil level position, if you find that oil is insufficient, should be added to the same type of oil. Fourth, check whether there is enough water tank, if you are using open-cycle cooling system, you should turn on the water. Fifth, use a hand pump on a fuel pump to compress the fuel to the fuel system, and loosen the bleed screw on the fuel pump to remove the air from the fuel system. When there is no more gas to remove, tighten the screw , And then continue to pump oil until the return pipe back to the oil, and finally hand pump tightened. Sixth, in turn, loosen the high-pressure tubing joint nut on each cylinder injector, place the governor handle in the diesel engine operating position, turn the diesel engine to discharge the air in each high-pressure tubing (this step can be ignored under normal circumstances. Failure should not be ignored). Seventh, a new engine or parked diesel engine for more than 5 days, start cranking 3 to 5 turns before starting. Eighth, a warm-start device, and the need to warm-up start (temperature below 5 ℃), should also check the glow plug is normal (rated voltage 24V glow plug under normal conditions resistance of about 0.025Ω, 12V more Smaller). 4, diesel fire pump inspection In order to improve the diesel fire pump response to fire signals, it is recommended weekly inspection. Taking into account the water hammer effect and diesel engine's own characteristics, inspection we should start low-speed diesel engine, and then slowly accelerate to the fire required speed - 1500r / min. When the water temperature, oil temperature reached 60 ℃ can be gradually decelerated, but still need to idle before stopping (300 ~ 750r / min) run 2 ~ 3min, so as not to suddenly stop due to supercharger overheating turbocharger bearing killed ! After parking, the speed must be adjusted to 1500r / min, for fire protection needs. As the diesel fire pump inspection process is more complex, so if there is no special customer requirements, we generally do not consider the design process of automatic inspection, it is recommended that users use manual inspection! 5, diesel fire pump daily management to ensure the reliability of the entire control system, improve the daily management is inseparable. Although the diesel engine fire pump has a high degree of automation, but man-made destruction of factors that make it out of function often happen! Components damaged or lost, time relay and charger parameters are wrongly modified, the user has a reflection! Therefore, the key pump room to have someone management, but also regularly check the equipment parts are lost or destroyed by other factors, as well as the parameters of various components is scientific and reasonable. 6 Conclusion Diesel fire pump and its control cabinet height automation, so that the entire set of equipment to achieve our unattended purpose, to better meet the user requirements for fire fighting equipment. Diesel engine fire pump to get rid of the shackles of the power grid and electric pumps sensitive action ability of the perfect combination of the precious life of mankind further away from the relentless fire!
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