When extinguishing fires, various pumps are used to supply pure water and with the addition of a foaming agent. One of the most common units is the NShN-600 pump, which is part of the standard equipment of almost all fire fighting equipment.
Total information
This device was located on the front bumper of fire engines and was driven directly from the power unit through an uncoupling clutch (ratchet on the engine shaft pulley). Optionally, the NShN-600 fire pump can be equipped with additional hoses for intake and supply of liquids. Upon initial delivery, the product is in a wooden container and is completed with an individual technical passport indicating the serial number. The number is embossed on the body part.
The NShN-600 pump is capable of delivering up to 600 liters of liquid per minute in an operating mode, taking it from a depth of not more than 6.5 m. The small dimensions of the product (not more than 350 mm) and heavy weight (30 kg) ensure reliable installation of the unit on any surface.
Device
The pump housing NShN-600 is cast from gray cast iron and has thick walls. On the lower part of the crankcase there are tides that act as supports. They have cylindrical holes through which the unit is mounted on a work surface (for example, a bumper). On the upper part there are two nozzles with hose fastening elements. Two cylindrical channels in which steel gears rotate are made in the inner part of the housing. These parts are made of steel and have the same shape and number of teeth. High precision manufacturing of nodes ensures a minimum gap between the side parts of gears and covers (maximum 0.18 mm), which allows to obtain high values of vacuum and pressure.
Gear shafts are mounted on ball bearings in the caps of the NShN-600 pump. The tightness of the bearing units is ensured by rubber seals. To support the supports, there are two grease fittings through which a fresh portion of the lubricant is periodically added (this operation is carried out during routine maintenance).
A safety valve is installed inside the connecting channel, located between the inlet and pressure pipes. In the event of a sudden shutdown of the supply or pressure channel, this valve circulates the fluid inside the unit. On the upper part of the crankcase there is a place for installing a pressure gauge for pressure and mounting a vacuum measuring device in the intake channel.
Application options
The written-off pumps NShN-600 are often used in makeshift stations to supply water in summer cottages or cottage villages. An electric motor is used as a drive, which is rigidly connected to the pump shaft. All nodes of the pumping station are placed on a makeshift frame, the dimensions of which are adjusted to the mounting points.