A large-size cylinder liner of a toughened porcelain-metal composite mud pump and its prestressed hot-fitting method

Abstract

The invention discloses a large-size cylinder liner of a toughened porcelain-metal composite mud pump and a prestressed hot-packing method thereof, and relates to the fields of mud pump manufacturing technology and new ceramic materials. The large-size cylinder liner of the tempered porcelain-metal composite mud pump is composed of a metal outer sleeve and a tempered porcelain inner sleeve. The prestressed shrink-fitting technology refers to promoting metal Strong combination of outer shell and ceramic inner shell. The formula percentage of the middle layer material is as follows: corundum powder 72%, tin powder 10%, liquid stone plaster 10%, PVA glue 3%, stearic acid 5%. The method for prestressed thermal installation of a large-size cylinder liner of a ceramic-metal composite mud pump provided by the present invention is easy to operate and has high assembly accuracy. The ceramic inner casing, the metal outer casing and the prestressed intermediate layer form a firm and tight integration, which will not crack or damage during the assembly process, and will not be easily damaged in geological excavation, oil drilling platforms and non-excavation engineering applications.

Description

technical field [0001] The invention belongs to the fields of mud pump manufacturing technology and novel ceramic materials. In particular, it relates to a method for prestressing and hot-packing a large-size cylinder liner of a toughened ceramic-metal composite mud pump. Background technique [0002] The high-pressure mud pump is one of the essential machines for geological excavation, deep well oil drilling and mining, and the cylinder liner for conveying mud is an important part of the mud pump, so the performance of the cylinder liner for the mud pump directly affects the efficiency of the project and cost. At present, the widely used cylinder liners are mainly bimetallic cylinder liners. Due to the harsh construction conditions, including sand and mud wear, corrosion and high-pressure punching of the plunger, the bimetallic cylinder liners are not corrosion-resistant and have poor wear resistance. The short service life has affected its long-term use; in addition, the...

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Problems solved by technology

At present, the widely used cylinder liners are mainly bimetallic cylinder liners. Due to the harsh construction conditions, including sand and mud wear, corrosion and high-pressure punching of the plunger, the bimetallic cylinder liners are not corrosion-resistant and have poor wear resistance. The short service life has affected its long-term use; in addition, the layered casting process of bimetal is relatively complicated, and it is difficult to accurately control the product quality

[0003] In view of the above situation, it was found that the large-size cylinder liner of the ceramic-metal composite mud pump can better solve the above problems, but due to the huge difference in thermal expansion coefficient between metal and ceramics, and ceramics are brittle materials, during the assembly process with metal There are often a series of problems such as ceramic dominant external cracks and hidden internal cracks caused by excessive stress, or a series of problems such as low service life and unstable quality due to insecure assembly, which lead to problems in the assembly and use of composite cylinder liners. Small problems, such as patent CN102155323, a composite prestressed ceramic liner, patent CN102672145, a manufacturing method of composite prestressed reinforced ceramic liner, both are products with small cylinder liners, if the size is larger , the stress concentration will be very serious, and the stress will increase geometrically. Even if it does not crack during assembly, it will crack in later use. This assembly method can well solve the problem of large-scale cylinder block assembly.

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