Non-return structure of manual pump

Abstract

The invention discloses a non-return structure of a manual pump. The non-return structure comprises a pump body and a flange plate. The flange plate is arranged at the bottom of the pump body, a steel ball and a cavity are arranged in the flange plate, screen cloth provided with a plurality of meshes is arranged at an inlet of the pump body and is positioned on the top of the cavity, and the diameter of each mesh is smaller than that of the steel ball by 2mm. A rubber buffer layer is arranged on the inner wall of the cavity. The steel ball is a chromium steel ball. The non-return structure has the advantages that the screen cloth can effectively prevent the steel ball from entering the pump body; the large quantity of meshes are arranged on the screen cloth, the diameter of each mesh is smaller than that of the steel ball by 2mm, accordingly, power can be provided for the pump body without influence of the steel ball, the opportunity of collision between the steel ball and each mesh can be reduced, the steel ball and the meshes are not easy to abrade, and the steel ball can be prevented from being sucked into the pump body via the meshes; impact abrasion on the steel ball can be reduced owing to the rubber buffer layer on the inner wall of the cavity; the chromium steel ball is high in hardness and is abrasion-resistant.

Description

technical field [0001] The invention relates to a hand pump, in particular to a check structure of the hand pump. Background technique [0002] The Chinese Invention Patent No. 200910213002.8 published on June 9, 2010, titled "A Hand Pump", discloses a check structure of a hand pump, including a pump body and a flange. The flange is provided with a steel For the ball and the cavity, the diameter of the inlet at the top of the cavity is set to be smaller than the diameter of the steel ball, about 0.5-1mm smaller, to prevent the steel ball from entering the pump body. However, since the steel ball constantly collides with the cavity or the inlet, the steel ball itself will wear out as the usage time increases. In addition, the inlet itself will also wear out, and the steel ball will still be sucked into the pump body through the inlet. If the diameter of the inlet is further reduced, it will affect the power supply of the pump body itself. Contents of the invention [0003...

AI Technical Summary

Problems solved by technology

However, due to the continuous collision of the steel ball with the cavity or the inlet, the steel ball itself will wear out as the use time increases. In addition, the inlet itself will also wear out, and the steel ball will still be sucked into the pump body through the inlet.

If the diameter of the inlet is further reduced, it will affect the power supply of the pump itself

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