Patent Application
20080169642
Pursuant to 35 U.S.C. ยง119 and the Paris Convention Treaty, this application claims the benefit of Chinese Patent Application No. 200710034266.8 filed Jan. 16, 2007, the contents of which are incorporated herein by reference.
1. Field of the Invention
The invention relates to a pipe elbow, and more specifically, to a pipe elbow for transporting highly-abrasive concrete materials.
2. Description of the Related Art
During transport of concrete materials by concrete transporting pipes, excessive wear is a common problem, which is especially evident in the sections of pipe elbows. Generally, concrete transporting pipes have to face adverse operating factors in order to transport concrete materials to their destination, such as, high transportation height (the operating environment is generally 20-400 meters high); high hardness of concrete material, which generally contains large lime stones and gravels; and poor flowability of concrete material, which increases the pressure applied to the pipe elbow and aggravates the wear thereof.
The service lifetime of conventional steel elbow is short due to its limited abrasion resistant capability, and is generally 2-3 months (which is equivalent to transporting about 20000 m3 concrete materials). Accordingly, there is an urgent need to find a choice material having a good abrasion resistant capability and a long service lifetime to replace the conventional steel elbows in order to minimize the wear of the pipe elbow during the transportation of concrete materials.
Therefore, it is one objective of the invention to provide a spliced abrasion resistant ceramic elbow having good abrasion resistant capability, low brittleness, long service lifetime, and no shrinkage strain.
To achieve the above objective, provided a spliced abrasion resistant ceramic elbow, comprising a seamless elbow body. An abrasion resistant ceramic inner lining is disposed on the seamless elbow body, and is formed by splicing a plurality of abrasion resistant ceramic tiles. Namely, the abrasion resistant ceramic tiles are spliced together along the circumferential direction to form an abrasion resistant ceramic bushing ring fitted with the seamless elbow body, a plurality of the abrasion resistant ceramic bushing rings are connected along the axial direction together to form the abrasion resistant ceramic inner lining fitted with the seamless elbow body. An end ring to block the abrasion resistant ceramic inner lining is disposed at each of the both ends of the seamless elbow body.
In certain embodiments of the invention, a high strength and high temperature resistant inorganic adhesive is filled in the gap between the seamless elbow body and the abrasion resistant ceramic inner lining.
In certain embodiments of the invention, the abrasion resistant ceramic inner lining is extended to the insides of the end rings to cover their inner surfaces.
In certain embodiments of the invention, the thickness of the outer bend having a large bending radius of the abrasion resistant ceramic inner lining is larger than that of the inner bend having a small bending radius of the abrasion resistant ceramic inner lining.
In accordance with the abrasion resistant ceramic elbow of the invention, the abrasion resistant capability of the pipe elbow is increased largely; the molding of monolithic pipe and the control of the manufacturing process owing to brittleness and shrinkage are solved effectively; and the service life of the pipe is prolonged. The material powder does not contain impurities such as iron, therefore, the product quality and the production efficiency are increased, and the manufacturing cost is decreased. The abrasion resistant ceramic elbow of the invention has the advantages of strong abrasion resistant capability, good stability and shock resistance performance. Most importantly, the ceramic elbow of the invention is eccentric, namely, the outer bend withstanding most wear of the ceramic inner lining is thicker than the inner bend of the ceramic lining. Therefore, the spliced abrasion resistant ceramic elbow has a 5-8 times longer service life compared to the conventional material.
As a result, the abrasion resistant ceramic elbow has a good abrasion resistant capability, low brittleness and no shrinkage strain, simple structure, low cost, and good reliability, and is easy to manufacture and assemble.
The objects and advantages of the invention will become more readily apparent after reading the ensuing descriptions of the non-limiting illustrative embodiment and viewing the accompanying drawings, in which
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As a further improvement, a high strength and/or high temperature resistant inorganic adhesive 3 is filled in the gap between the seamless elbow body 1 and the abrasion resistant ceramic inner lining 4, and serves to adhere the abrasion resistant ceramic inner lining 4 more reliably to the inner surface of the seamless elbow body 1.
While particular embodiments of the invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the invention in its broader aspects, and therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 200710034266.8 | Jan 2007 | CN | national |
