Electric steam generator, also known as exempt type small electric steam boiler, miniature electric steam boiler, etc., is a kind of automatic replenishment, heating, at the same time, continuously produce low-pressure steam miniature boiler, small water tanks, replenishment pumps, control and operating system complete set of integration, without the need for complex installations, as long as the connection to the water source and the power supply can be. Mainly for the canteen, dry cleaners, steam rooms, steam irons to provide the necessary dry steam, in food factories, soybean factories, garment factories more commonly used.
Because the water volume of the electric steam generator is designed to be less than 30L, so the installation and use of electric steam generator is not subject to inspection and management of the technical supervision department. "Special Equipment Safety Supervision Regulations" defined boiler refers to the use of various fuels, electricity or other energy sources, will be filled with liquid heated to a certain parameter, and the external output of thermal energy equipment. The scope of its provisions for the volume greater than or equal to 30L pressurized steam boiler; outlet water pressure greater than or equal to 0.1MPa (gauge pressure), and rated power greater than or equal to 0.1Mw pressurized hot water boiler; organic heat carrier boiler.
Second, the principle of electric steam generator
Its basic working principle is: through a set of automatic control devices to ensure that the operation of the liquid controller or high, medium and low electrode probe feedback control of the pump open, closed, the length of the water supply, the heating time of the furnace gallbladder; by the pressure relay regulates the maximum steam pressure with the continuous output of steam, the furnace gallbladder water level continues to fall, when the water level in the Low water level (mechanical), in the water level (electronic), the pump automatically replenish water to the high water level, the pump stops replenishing water; at the same time, the furnace gallbladder continues to heat the electric heating tube, a steady stream of steam, the panel or the top of the upper pointer pressure gauge instantly shows the value of the steam pressure, the whole process can be automatically displayed through the indicator.
Three, electric steam generator structure
Electrically heated steam generator is mainly composed of water supply system, automatic control system, furnace and heating system and safety protection system.
1, the water supply system is the throat of the automatic steam generator, a constant supply of dry steam to the user. When the water source into the water tank, open the power switch, driven by the self-control signal, high-temperature resistant solenoid valve opens, the water pump works, through the check valve into the furnace gallbladder. When the solenoid valve, check valve blockage or damage, the water supply reaches a certain pressure will be overpressure valve overflow back to the water tank, thus protecting the pump. When the water tank water or residual air in the water pump piping, only into the air and not water, as long as the exhaust valve through the exhaust valve quickly exhaust, to be sprayed out of the water, close the exhaust valve, the water pump can work normally. The most important component in the water supply system is the water pump, most of the higher pressure and larger flow rate of multi-stage vortex pumps, a small part of the use of diaphragm pumps or vane pumps.
2, the level controller is the central nervous system of the generator automatic control system, divided into two categories of electronic and mechanical. Electronic level controller through three electrode probe of different heights to control the liquid level (i.e., the difference between the height of the water level), so as to control the water pump water supply and heating time of the heating system of the furnace gallbladder, the working pressure is stable, the scope of application is relatively wide. Mechanical level controller using stainless steel float type, applicable to the generator with a large volume of the furnace chamber, the working pressure is less stable, but easy to dismantle, maintenance and repair.
3, the body of the furnace gallbladder are generally made of boiler-specific seamless steel tube, was slender upright. Most of the electric heating system used by 1 or more stainless steel electric heating tube bending combination, and its surface load is generally about 20 watts / square centimeter. As the generator has high pressure and temperature during normal operation, the safety protection system can make it safe, reliable and efficient in long-term operation. Generally used high-strength copper alloy made of safety valves, check valves, exhaust valves, the implementation of three-tier protection. Some products also add a water level glass tube protection device, increasing the user's sense of security.
Four, electric steam generator scope of application
Widely used in the washing and ironing industry: dry cleaning machine, dryer, washing machine, dehydrator, ironing machine, ironing machine, and other equipment supporting the use of; packaging machinery industry: labeling machine, set of labeling machine supporting the use of; biological and chemical industries: fermentation tanks, kettles, sandwich pots, mixers, emulsifiers, and other equipment supporting the use of; food machinery industry: Tofu machine, steamer, sterilization tank, packaging machine, coating equipment, sealing machine, and other equipment supporting the use; other applicable industries: (oilfield, automotive) steam cleaning industry, (hotels, dormitories, schools, mixing stations) hot water supply, (bridges, railroads) concrete maintenance, (recreational clubs) sauna baths, heat exchange equipment, etc..