China has a vast territory with a large span of north and south and very different climatic distribution. Northeast China, the lowest temperature in winter up to minus 45 degrees. In the winter, fire engines filled with fire extinguishing agents in the midst of fire fighting, its inlet and outlet valves, inlet and outlet pipes, fire pumps, have the possibility of being cracked. If the fire pump is cracked, the whole fire engine will lose the role it should have played. How to solve this problem is a problem set in the fire department.
From this phenomenon we analyze, to solve the problem of fire insulation, antifreeze, one must have reliable, enough power heat source to meet the fire pump room insulation needs; Second, the pump room must have enough space, but also to meet the fire Operational requirements. There are several forms of heating equipment commonly available in the automotive industry, which can be classified into engine-based heating systems and non-engine-based heating systems according to the sources of heat used.
A non-independent heating system Non-independent heating system, also known as waste heat heating system, which uses the exhaust heat of the vehicle exhaust heat or engine cooling water circulating heat as heat and introduced into the heat exchanger, the fan will be inside or outside the car Air is blown through the heat exchanger to warm it up.
(1) Recuperation and air-warming system? The system of using exhaust heat of automobile exhaust to heat is called residual heat and air-warming system, mainly in the following two forms: Heat exchanger type The working principle of this device is that the exhaust of the engine Tube, install a heat exchanger for heating the air. Work, the valve will be closed to the muffler, exhaust heat into the heat exchanger on the other side of the air, cold air to absorb heat after the temperature increases, blowing into the compartment by the fan. The heating effect of this device is affected by speed and engine operating conditions, and the heating temperature is not stable. In addition, the exhaust of SO2, H2O, etc. will corrode the heat exchanger wall; exhaust pipes and heat exchangers increase the exhaust resistance of the engine, the working conditions of the engine have an impact. Heat pipe using heat pipe heat exchanger, exhaust heat recovery engine exhaust, the main use of large cars warm in winter. Heat pipe heater effect is warm, safe and reliable, the engine exhaust will not leak into the car.
(2) Remaining Hot Water Heating System The system that uses engine cooling water to heat a heat source is called a hot water system. Cars, vans and chartered vehicles commonly use this device. It uses the cooling water of the engine as a heat source, exchanges heat between the air sent by the blower and the engine cooling water through a heat exchanger (usually called a warm air core) in the device, and sends the air into the room after the air is heated. In trucks, lorries or pick-up trucks that are not equipped with cold air conditioners, an assembly composed of a heater core, a blower and a housing is generally used. The housing is provided with a blower to the foot, an air outlet at the front and a blower to the window Defrosting effect of the outlet. Residual heat plumbing system device is simple and reliable heating, no additional fuel, as long as the engine work, can produce hot water. The disadvantage is that the engine cooling water temperature must rise to a large cycle when heating, heating in the cold season appears to be somewhat inadequate, and even lead to engine overcooling, affecting the normal operation of the engine; in the parking heating, the engine increases the engine Wear and tear; fire pump room if only rely on this device is difficult to meet the heating requirements, and the new diesel engine with high efficiency, can be used as a warm residual heat is relatively small.
Two independent heating system? Large luxury cabs, buses and cars used in cold areas, commonly used independent heating system. The so-called independent, that is, it runs an independent engine. According to the different heating medium, divided into air-warmed heater and plumbing heater. Both of these heaters burn gasoline or diesel in a burner and the heat generated heats air or water. After the combustion of the gas is expelled from the car after heat exchange, the air pollution to the car room.
(1) independent air-conditioning heating system This device is generally composed of a combustion chamber, heat exchanger, fuel supply system, air supply system, control system. The working process is as follows: the fan motor is powered on, the combustion air fan and the warm air fan are driven, and the oil pump supplies oil to the combustion chamber; the oil is atomized at the inlet of the combustion chamber and mixed with the air coming in from the combustion air inlet; .
The heat generated by the combustion is exchanged by the heat exchanger with the cold air coming in from the cold air inlet, and the cold air becomes warm air which is supplied into the passenger compartment by the warm air outlet. The entire heater operation is controlled by the control block. Such heaters are particularly suitable for commercial vehicles, such as minibuses, trucks, vans, construction vehicles, especially long-haul trucks, that do not require much air distribution quality. Because of its ability to run an independent engine, it can warm while parked, greatly reducing engine wear and lowering emissions. When the car is running, it can also be used as a supplement to the car heater.
(2) independent plumbing heating system? Independent plumbing heating system works basically the same with the air-heating, the difference is that the heating medium is water instead of air, water pump instead of the fan. Plumbing heaters and engine cooling water pipes, air-conditioning heater core warm water channel, so it's biggest advantage is not only used as the car warm, but also preheat the engine, lubricating oil, in order to facilitate winter engine start , Improve the engine start-up and durability. Most plumbing heaters are used on cars and buses, but trucks and construction vehicles are also used in cold regions. Heater mainly with the internal circulation, less dust, heating softer and not dry. For the above advantages and disadvantages of non-independent heating system and independent heating system, we repaired the most suitable independent heating and air-conditioning heating system. Independent air-heating system heat source from the free-standing fuel furnace, through the pipeline to the warm air around the pump room, play a thermal effect. Heating system working voltage 24V, power consumption 70W, fuel consumption 0.6kg / h, fuel tank capacity 7.2L (together 5.4? Kg), heat flux 4.6KW, sustainable heating 9 hours. Although the fire pump chamber baffle and shutter insulation effect can not be compared with the house, but the fire pump room space is only 6.308m3, the heat of the heating system is sufficient to keep the temperature of the pump room above 0 ℃, so fully protected Fire on duty vehicles in the winter security duty on duty duty readiness mission.
Keywords: pump