Anti-siphon structure for inlet of lubricating oil pump

The utility model relates to the technical field of lubricating oil pumps, in particular to an inlet anti-siphon structure of a lubricating oil pump. The check valve comprises a mounting seat, a clamping piece and a valve plate, wherein the mounting seat is a circular-ring-shaped interface; a limiting seat is arranged at the center of the middle of the mounting seat; multiple groups of supporting pieces extending to the circle center position of the mounting seat are arranged along the inner wall of the mounting seat; the valve plate is arranged along the inner wall of the clamping piece; a vertically upward guide rod is mounted in the center of the valve plate; a limiting piece is arranged at the top of the guide rod; an elastic piece is arranged along the periphery of the guide rod; when the valve plate moves to the lowest position, the elastic piece is kept in a compressed state; lubricating oil downwards flows into the lubricating oil pump from the mounting seat; the elastic piece releases elastic potenti