Manufacturing method of narrow-flow-channel closed impeller

A technology for closed impellers and manufacturing methods, which is applied to non-variable pumps, parts of pumping devices for elastic fluids, machines/engines, etc., and can solve the problems of difficulty in manufacturing narrow channel closed impellers, etc. Achieve the effect of ensuring the size of the runner and surface roughness and improving the casting pass rate

Inactive Publication Date: 2020-01-07
XIANGYANG WU ER WU PUMP IND
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Problems solved by technology

[0003] The present invention provides a method for manufacturing narrow-channel closed-type impellers in order to solve th

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  • Manufacturing method of narrow-flow-channel closed impeller

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Embodiment

[0017] A method for manufacturing a narrow-channel closed impeller according to the present invention, the narrow-channel closed impeller is designed as a split front cover 1 and an open impeller body, the open impeller body includes a rear cover 2, and the The blades on the front side plate of the rear cover, and the center of the rear cover is provided with a hub 4 for connecting the pump shaft;

[0018] The specific manufacturing steps are as follows:

[0019] Step a, processing of the open impeller body: firstly, the blank of the open impeller body is made by using a casting mold, and the blank of the open impeller body after casting is fully polished. The open-type impeller body exposes the sand inclusions on the inner wall of the impeller flow channel and the dead corner of the casting that could not be processed before, so as to facilitate sand cleaning and grinding and processing; and then process positioning pin holes on each blade of the open-type impeller body;

[...

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Abstract

The invention discloses a manufacturing method of a narrow-flow-channel closed impeller. The method comprises the steps that the narrow-flow-channel closed impeller is designed into a split-type frontcover plate and an open-type impeller body; a casting mold is used for manufacturing workblanks of the open-type impeller body and the front cover plate respectively, and the cast workblanks are polished and subjected to sand blasting; the processed front cover plate is in butt joint with the face, provided with blades, on the open-type impeller body, a positioning pin is inserted in the butt joint portion for welding fixing, and after welding is completed, the closed impeller is subjected to thermal treatment. According to the manufacturing method, the strength of the impeller and a shaft hole is not influenced, the flow channel size and surface roughness can be guaranteed, the problem that the casting dead corner is difficultly polished and cleaned is solved, so that all flow channels of the impeller completely meet the design demand and achieve impeller performance, and by using the impeller manufactured through the method, the qualification rate of casting the narrow-flow-channelclosed impeller and the working efficiency of an overall pump set can be greatly improved.

Description

technical field [0001] The invention relates to a method for manufacturing a narrow channel closed impeller, which belongs to the field of impeller manufacturing. Background technique [0002] The impeller is an important part of various pump sets. The impeller is an important part of the pump set. The manufacturing level of the impeller determines the efficiency and energy consumption of the pump. The impeller is classified from the structure. The impeller can be roughly divided into closed impeller, semi-open impeller and open impeller. The closed impeller is closed by the cover plate up and down. Sand is difficult, so production is the most difficult, and most of them can only be completed by various casting methods, especially as the water outlet of the closed impeller becomes smaller, the difficulty of production increases geometrically. Among them, the impeller with a small water outlet and high performance requirements can only be completed by precision casting, but ...

Claims

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Application Information

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IPC IPC(8): B23P15/00F04D29/18
CPCB23P15/006F04D29/18
Inventor 代云飞李晓斌李丽陈群师宏刚史浩
Owner XIANGYANG WU ER WU PUMP IND
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