Anti-corrosion layer for water pump bucket ring, bucket ring comprising the layer and construction method thereof

Abstract

The invention discloses an erosion-proof layer of pump hole ring and constructing method, which comprises the following parts: whole ring surface (1), epoxy mastic (2) on the hole ring surface (1), polyester rubber (3) on the epoxy mastic (2) and preparing part (4) of epoxy mastic on the polyester rubber (3). The invention simplifies the constructing technology, which saves the cost.

Description

technical field [0001] The invention relates to a large-scale water pump for agricultural irrigation, urban and industrial water, in particular to the mouth ring of the water pump, the anti-corrosion layer of the mouth ring and the construction method thereof. Background technique [0002] Large-scale water pumps with large flow and high head are mainly used for agricultural irrigation, urban and industrial water supply. This kind of water pump runs in sandy rivers, and the flow-passing parts of the water pump, including the impeller, pump casing, outer ring and mouth ring, will be damaged by abrasion and other effects, and the damage of the mouth ring is the most serious. At present, the water pump mouth ring is mostly made of cast iron or cast steel. The mouth ring without protection measures generally has a service life of 200 to 1000 hours, and the average life span is 500 hours before it is scrapped. The damage of the mouth ring not only affects the service life of the...

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Problems solved by technology

[0003] There are generally two types of protection measures for the water pump mouth ring: one is the protection of metal powder, which uses cermet powder or nickel-based alloy powder for oxygen-acetylene flame spray welding. The ring substrate is easily deformed and the cost is relatively high, so it is generally not used

The other is non-metallic coating. From the late 1970s to the early 1980s, composite nylon coating and polyurethane casting mouth ring were successively used. The former is not ideal due to poor adhesion, and the latter is easy to deform due to high toughness; Cast iron is used as the framework of polyurethane casting, and the process conditions are very complicated, which cannot be applied to large water pumps.

In the mid-1990s, epoxy emery was used as a protective coating for the mouth ring, but the anti-abrasion effect was poor and the effect was not satisfactory.

At present, the epoxy-polyurethane composite coating is relatively effective for the protective coating of the water pump mouth ring, but this coating also has the following defects: (1) If the coating is cured at room temperature, it will affect the anti-wear performance of the coating , and the service life of the mouth ring is not high; (2) If the coating is cured at high temperature, although the wear resistance of the coating has been improved, the high temperature curing process is generally not popularized in electric irrigation stations on both sides of the Yellow River; (3) This composite coating The layer needs to be painted by brushing process. Brushing the polyurethane surface layer with a thickness of 2-3mm requires brushing 8-10 times. The process is cumbersome, and this process will inevitably bring a small amount of air bubbles to the surface layer and affect the coating performance.

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