Civil air defense hand pump

SH-38Civil air defense hand pump

SH-38Civil air defense hand pump

SHStructural Description of Type Hand cranked Pump:

The structural principle of a hand pump is that when the handle is shaken back and forth by hand, the piston undergoes reciprocating motion through transmission mechanisms such as shafts, rocker arms, and connecting rods. As shown in the figure, when the piston moves to the left, the volume of the pump cylinder on the right end gradually expands, forming a vacuum. The liquid flows from the suction pipe through the suction passage cast next to the pump body and opens the suction valve to enter the right end of the cylinder body. At the same time, the compression of the piston on the left side of the cylinder causes the water pressure valve to open, and the liquid is discharged through the discharge pipe. If the movement direction of the piston returns to the right, the left side of the pump cylinder will suck in liquid, and the right side of the pump cylinder will discharge liquid, so as to continuously suck in and discharge the liquid. Forming the operation of the pump. The upward stroke of the pump's pressure valve is limited by the cover plate, and the upward stroke of the suction valve is limited by the pressure valve. The cover plate and pump body are fastened with bolts, and the piston stroke is limited by the pump cover and pump body.

For installation on walls or other foundations, the pump body has four bolt holes.

SHPerformance parameters of the hand cranked pump:

SHType hand pump usage:

This type of hand pump is suitable for pumping clean water, gasoline, kerosene, and non corrosive liquids such as iron and copper. It is not suitable for liquids containing fibers or other solid particles. The temperature of the suction liquid is60Below ℃(Refers to a leather bowl pump)Its performance range; Pumping capacity0.8-1.1rise/Next, the maximum lift is20Rice. Hand cranked pump has a compact structure, elegant and beautiful style, easy and reliable use, and only requires1-2People can work by shaking the handle back and forth with their hands. Can be used by industrial and mining, enterprises, schools, vehicles, ships and other units.

Hand cranked pump maintenance content:

1Replace the piston rings and cups

① When the hand pump used is piston type; First, remove the pump cover and remove the piston ring. If excessive wear is found, replace the piston ring. If the elasticity of the piston ring decreases and cannot be firmly attached to the water pump body wall with excessive clearance, the piston ring must also be replaced. Check whether the piston ring is attached to the cylinder wall and can be tested for light or water leakage.

② When the hand pump used is a leather bowl type, remove the pump cover to check if the leather bowl is damaged, because the leather bowl is made of cowhide and is likely to wear out and break over time, so a new leather bowl is needed.

2Check the suction pressure water valve

Each water shake pump has four water valves, namely two suction valves and two pressure valves, which are installed on the pump body. They can be removed by removing the cover nut.

The key issue in checking the water valve is to check whether the valve is tightly fitted with the valve seat. After a period of use, it may have been worn, corroded, and uneven, causing water leakage. Therefore, during maintenance, the valve must be disassembled and inspected. If unevenness is found, it must be ground with grinding sand. The smoothness of the joint between the valve and the valve seat is△8.