Structure for relieving stress concentration of intersecting lines inside plastic tee pipe

Abstract

The invention relates to the technical field of pipes, in particular to a structure for relieving stress concentration of intersecting lines inside a plastic tee pipe. The structure for relieving the stress concentration of the intersecting lines inside the plastic tee pipe comprises the plastic tee pipe, the inside of the plastic tee pipe comprises a first pipe tube, a second pipe tube and a third pipe tube, the first pipe tube and the second pipe tube are arranged in left-right symmetry, the third pipe tube is arranged to be vertically upward, and circular-arc-shaped bosses are arranged at the intersecting position of the third pipe tube and the first pipe tube and the intersecting position of the third pipe tube and the second pipe tube. Compared with the method for improving the entire strength of the plastic pipe by increasing the thickness or adding ribs, a plastic pipe product manufactured by using the structure can effectively save materials and lower the production cost of the plastic pipe. Compared with an original structure, the plastic pipe manufactured by using the structure can effectively lower the degree of the stress concentration of the intersecting lines inside by more than 20%, crackles are prevented, the service life of the plastic pipe is prolonged, and safe using of the plastic pipe is guaranteed.

Description

technical field [0001] The invention relates to the technical field of pipelines, in particular to a structure for alleviating the stress concentration of intersecting lines in plastic three-way pipe fittings. Background technique [0002] Recently, with the country's great investment in infrastructure construction, the domestic demand for plastic pipe fittings has maintained a strong growth rate, especially in the construction of urban water supply and drainage pipe networks, plastic pipe fittings are playing an increasingly important role . Compared with traditional metal pipe fittings, plastic pipe fittings have light bulk density, low cost, strong corrosion resistance and long service life. Generally speaking, the service life of plastic pipes is more than 50 years, basically reaching the same service life as buildings. It is an irresistible trend in historical development that pipe fittings replace traditional metal pipe fittings. Now plastic pipe fittings have been wi...

AI Technical Summary

Problems solved by technology

However, these existing plastic pipe fittings also have shortcomings such as insufficient overall strength and are prone to damage and failure, especially at the position of the inner intersecting line of the plastic pipe fitting. Sharp corners are formed, and the sharp corners will produce stress concentration under the action of force. When the degree of stress concentration reaches the strength limit of the material, the plastic pipe fittings will fail and damage, resulting in water and air leakage, which is more serious. may even cause safety accidents

[0003] The reinforced plastic pipe fitting introduced in the patent "A Reinforced Plastic Pipe Fitting" (Patent No.: 200420019533.6) is mainly provided with bosses on the circumference of the outer end face of the plastic pipe fitting and ribs between the outer end faces, and its structural strengthening is mainly It is implemented on the outer surface of the plastic pipe fittings. Although this structure has a certain strengthening effect on the overall strength of the plastic pipe fittings, the effect of improving the stress concentration at the position of the intersecting line in the plastic pipe fittings is not obvious. In fact, the plastic pipe fittings The failure rupture generally starts from the occurrence of small cracks at the position of the inner intersecting line, and the continuous growth of small cracks eventually leads to the rupture and failure of the entire plastic pipe fitting.

[0004] The patent "Structure for Preventing Stress Concentration on Corners" (Patent No.: 200410078068.8) proposes a method to prevent stress concentration by using two connected circular arcs, which mainly reduces stress concentration through two connected circular arcs. However, there are still places where the stress concentration is relatively intense between the arcs. Although the stress concentration has been improved, the improvement effect of the stress concentration is not very obvious.

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