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Abrasion-resistant heat shock resistant impeller type fluid mechanical blade and preparation method

A fluid machinery and impeller-type technology, which is applied in the direction of mechanical equipment, liquid fuel engines, and components of pumping devices for elastic fluids, etc., and can solve problems such as wear protection measures for flow-passing components, coating peeling, and different thermodynamic properties

Inactive Publication Date: 2013-01-09
JIANGSU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the thermal sensitivity of ceramics, the thermodynamic properties of ceramic coatings are different from those of the sprayed parts and materials. When subjected to thermal shock, large-area ceramic or cermet coatings are inconsistent with the degree of thermal expansion and contraction of the sprayed materials. , easy to produce cracks and lead to peeling off of the coating, resulting in the failure of the wear protection measures of the flow-passing parts, greatly shortening the life of the impeller
At present, impeller fluid machinery lacks a blade or blade protection measures that are resistant to abrasion and thermal shock.

Method used

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  • Abrasion-resistant heat shock resistant impeller type fluid mechanical blade and preparation method
  • Abrasion-resistant heat shock resistant impeller type fluid mechanical blade and preparation method

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Embodiment Construction

[0011] Such as figure 1 , figure 2 , taking the pump as an example, when the impeller rotates under the driving force, the impeller does work on the conveying medium, and the conveying medium undergoes centrifugal rotation in the impeller, and a local low pressure is generated at the inlet B of the impeller, and the air bubbles contained in the medium overflow and cause cavitation. Abrasion of pump blade surfaces. The conveying medium is sucked in from the impeller inlet B, discharged from the impeller outlet A, and when it reaches the outlet A, it has the maximum pressure. After the medium leaves the impeller, the flow space increases rapidly, the flow velocity and static pressure decrease rapidly, and cavitation occurs near the impeller outlet, causing serious damage to the surface of the blade outlet.

[0012] When the conveying medium contains abrasive grains, the abrasive grains will have a violent impact on the flow-passing parts, causing the surface of the material t...

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Abstract

The invention relates to an abrasion-resistant heat shock resistant impeller type fluid mechanical blade. The surface of the blade is sprayed with ceramic or metal ceramic, metal nets are clamped in spraying layers, a layer of a metal net is welded on the surface of the blade, metal meshes are sprayed with ceramic or metal ceramic, and finally metal nets which protrude out of the spraying layers are polished smooth. The process blade has good abrasion-resistant performance and strong heat shock resistant performance. The blade processing method is also suitable for surface protection processing of other flow passage components of fluid machines.

Description

technical field [0001] The invention relates to an impeller type fluid machine, in particular to an abrasion-resistant, heat-resistant and impact-resistant blade of the impeller type fluid machine. Background technique [0002] Impeller fluid machinery is widely used in power generation, metallurgy, chemical industry, water conservancy, environmental protection and other industries. Due to the combined damage of cavitation erosion and sand and gravel, the blades and other flow-passing parts of fluid machinery will cause damage to the metal surface, generate vibration and noise, cause equipment efficiency to decrease, frequent overhaul, and even short-term scrapping. How to solve the problems of cavitation erosion and sediment wear of water pumps or turbines has increasingly become one of the key technical problems in engineering construction. Abrasion problems also widely exist in shipbuilding, petroleum, chemical industry, national defense and other departments, so they ha...

Claims

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Application Information

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IPC IPC(8): F04D29/02
Inventor 汪家琼
Owner JIANGSU UNIV
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