Method for measuring inlet opening degree of mixed flow water pump blades

Abstract

The invention discloses a method for measuring an inlet opening degree of mixed flow water pump blades. The method comprises the steps of: 1) performing water inlet side boundary scribing on the headpart of the water pump blades; 2) mounting the blades on the impeller, and placing the impeller horizontally in an inverted manner on a tooling platform; 3) uniformly taking a plurality of measuring points on a water inlet side of one blade; 4) measuring the shortest distance S1 from one of the measuring points O1 to a horizontal plane of the upper end surface of a front cover plate by means of aflat ruler and a micrometer; 5) finding out a corresponding point O2 from the horizontal plane of the upper end surface of the front cover plate on a water inlet side of the adjacent blade to the water inlet side of the blade; 6) and measuring a distance between the two points O1 and O2 by using a micrometer, namely an inlet opening degree value at the point. The method can solve the problem of few effective points to be measured when measuring the inlet opening degree of the mixed flow water pump blades, provides enough effective points to be measured, improves the blade positioning and the dimensional detection precision, and ensures the quality of water pump manufacturing.

Description

technical field [0001] The invention relates to a method for measuring blades of a water pump, in particular to a method for measuring the inlet opening of blades of a mixed-flow water pump. Background technique [0002] At present, in mixed-flow water pumps, the shortest distance from a given point on the working surface of the blade inlet to the back of the adjacent blade is called the inlet opening of the blade at this point. Evenly take 7 to 8 points for calculating the inlet opening, and mark the corresponding inlet opening value, so that when manufacturing the pump wheel, the blade positioning and inspection size can be performed according to it. For a centrifugal pump impeller with a large number of blades (generally 8-9 blades), this method can be used to measure the inlet opening, but for a mixed-flow pump with a small number of blades (generally 3-5 blades), due to two adjacent The angle between the blades is large and the lateral width of the flow channel is larg...

AI Technical Summary

Problems solved by technology

For a centrifugal pump impeller with a large number of blades (generally 8-9 blades), this method can be used to measure the inlet opening, but for a mixed-flow pump with a small number of blades (generally 3-5 blades), due to two adjacent The angle between the blades is large and the lateral width of the flow channel is large. It is impossible to measure the inlet opening at 7 to 8 points evenly along the water inlet, because the space is blocked by the front cover when measuring some points.

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