JPS56136615A - Automatic discharger for deposited foreign matter in strainer - Google Patents

Abstract

PURPOSE: To make possible arbitrary time controlling from the time when a discharge valve opens until it closes by providing a specific regulating tank in continuation to the secondary pressure acting chamber side, in a strainer device with a mechanism for automatically discharging deposited foreign matter, for agricultural industry.

CONSTITUTION: A foreign matter deposits in the strainer, the pressure difference between the primary and secondary pressure acting chambers 10, 11 increases and when this rises above the force of a spring 15, a diaphragm 12 moves left. Then, a discharge valve opens to discharge the deposited foreign matter, whilst a communicating hole 7 is closed and the pressure in the chamber 10 does not drop rapidly. The pressure in the chamber 11 drops rapidly as the communicating holes 8 opens and the fluid flowed down into an auxiliary pilot chamber 37 is forced into a regulating tank 39. It is successively stored in the tank 39 by setting the sectional area of a passage 38 and a discharge port 44 at S₂>S₅. After a certain time, a spherical body 45 is floated and after the opening 42 is closed, the sealed chamber state is created because the discharge rate of the port 44 is small, then the chambers 10, 11 restore the same pressure and the spring 15 acts to close the discharge valve. If the volume of the chamber 39 is changed, the opening time of the discharge valve is regulated.

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