Novel material for oil gas recovery pump impeller of gas station

Abstract

The invention relates to a novel material for an oil gas recovery pump impeller of a gas station. The novel material takes wear-resistant cast iron as a base material and is prepared from the following raw materials in percentage by mass: 2.99 percent of C, 1.89 percent of Si, 0.684 percent of Mn, 0.001 percent of P, 0.071 percent of S, 0.002 percent of Mg, 0.033 percent of Cr, 0.007 percent of Ni, 0.002 percent of Mo, 0.178 percent of Cu, 0.002 percent of Al, 0.011 percent of Ti, 0.005 percent of V, 0.001 percent of Sb, 0.03 percent of Sn and 0.001 percent of Pb. The method has the advantages that the wear resistance and the strength of cast iron are improved, so that the pump can normally work in an environment without external lubricant, the quality guarantee period of the pump is properly prolonged, and the maintenance cost and the reinvestment cost of the oil station are reduced.

Description

technical field [0001] The invention relates to a novel material for a flower wheel of an oil gas recovery pump in a gas station. Background technique [0002] The oil gas recovery pump used in the gas station will cause the gas-liquid ratio discharge to exceed the standard due to the rapid wear of the moving parts of the pump body during use. As a result, it has received a penalty notice from the local environmental protection department. The material of the flower wheel of the moving parts is generally made of stainless steel 406 powder metallurgy. This material has a certain degree of rigidity and toughness, but since the pump body part cannot add any lubricant during work, the pump body will be damaged due to mutual friction during work. The surface is rough, causing the vacuum degree of the pump to drop sharply, and the working efficiency of the pump is slowed down. The cast iron material itself has self-lubricating effect due to the graphite content, but the wear resi...

AI Technical Summary

Problems solved by technology

[0002] During the use of oil and gas recovery pumps in gas stations, due to the rapid wear of the moving parts of the pump body, the gas-liquid ratio of the gas station will exceed the standard. The material of the flower wheel of the moving parts is generally made of stainless steel 406 powder metallurgy. This material has a certain degree of rigidity and toughness, but since the pump body part cannot add any lubricant during work, it will cause the pump body to rub against each other during work. The surface is rough, causing the vacuum degree of the pump to drop sharply, and the working efficiency of the pump is slowed down.

The cast iron material itself has self-lubricating effect due to the graphite content, but the wear resistance is not enough

[0003] Because the gas-liquid recovery pumps used in gas stations have a high proportion of unqualified gas-liquid ratio within two years of warranty, the unqualified gas-liquid ratio will cause a large amount of oil and gas to be discharged into the air and cause environmental pollution.

The current NP pump flower wheel generally uses stainless steel 406 as the base material, with a certain proportion of other metals. During the operation of the pump, the metal parts will rub against each other due to heat, and the surface will be worn rapidly, and the vacuum degree of the pump will drop sharply.