Improvement of Oil Filling System of Diaphragm Metering Pump for Chemical Machinery Zhang Yanhong X (Dalian Acid-resistant Pump Factory) The failure of the diaphragm end of the diaphragm metering pump is mainly due to diaphragm damage. In 1998, among dozens of diaphragm pumps produced by our factory, about 23% of the diaphragms were damaged. By analyzing the causes of damage to diaphragms, the authors improved the oil filling system of diaphragm metering pumps and improved the diaphragm metering pumps. The measurement accuracy.

1 Diaphragm metering pump charging system working principle Diaphragm metering pump transmits pressure through the diaphragm, under normal circumstances, the plunger and the diaphragm is filled with hydraulic oil, the reciprocating movement of the plunger moves the diaphragm back and forth within the limiting plate. So as to inhale and discharge the medium. When the hydraulic pressure in the hydraulic chamber decreases (such as leakage of hydraulic oil from the plunger packing), the diaphragm is attached to the rear limit plate, the plunger continues to move backwards, and the vacuum is formed in the hydraulic chamber when the spring pressure of the charge valve spring is reached. When the charge valve opens, the oil in the charge tank is replenished into the hydraulic chamber. When the hydraulic pressure in the hydraulic chamber is too high or the outlet is blocked, an abnormal pressure change occurs in the hydraulic chamber and the diaphragm is stuck on the front limit plate. When the pressure reaches the set value of the safety valve, the safety valve opens and the excess oil is discharged. In the tank. Diaphragm metering pump metering accuracy depends mainly on its replenishing system.

(2) Analysis of causes of damage to the diaphragm Before the improvement, the safety valve and the charge valve (a) are in a charge tank, and there is oil in the charge tank. When the pump is tested, the medium is usually clean water. When the operator sets the pressure of the safety valve according to the discharge pressure , Easy to improve the front and rear pump structure 1 - hydraulic chamber; 6 front limit plate; 2 - plunger; 3 - safety valve; 8 rear limit plate; 9 - bracket; 10 - limit valve plate ( Turn down page 44) 15 Yan Hong 1 female, (69 years 5 ° = 39.21 \ / 12 淳) 1 = 1.54 also Guo Yi * Ban Yang a. AC 遑洳 s9 also 塍 b. Xue.咎 砘 砘 砘 砘 砘 砘 砘 洚埘颚 洚埘颚 洚埘颚 洚埘颚 洚埘颚 洚埘颚 3

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