Novel hot-melting bell-and-spigot joint plastic pipe fitting

Abstract

The invention provides a novel hot-melting bell-and-spigot joint plastic pipe fitting. At least one end of the pipe fitting is provided with an annular bell-and-spigot, and the pipe fitting is provided with an outer ring and an inner ring; the outer ring is made from a material same with that of the pipe fitting, the internal diameter of the outer ring equals to the internal diameter of a bellmouth of a hot-melting bell-and-spigot joint plastic pipe fitting of the same specification, and a chamfer which faces the outer side of the pipe fitting is formed on the inner side of the end opening of the outer ring; and the inner ring is a thin-wall copper ring, the external diameter of the inner ring equals to the internal diameter of a plastic pipe of the same specification, and a chamfer which faces the inner side of the pipe fitting is formed on the outer side of the end opening of the inner ring. The axial length of the upper section of the inner ring is longer than the end opening of the outer ring by 1mm to 2mm. At the bottom of the bell-and-spigot, 2-4 vent holes are uniformly formed along the radial direction of the inner ring, and two observation holes which are staggered with the vent holes in position are symmetrically arranged along the radial direction of the outer ring. The novel hot-melting bell-and-spigot joint plastic pipe fitting has the obvious effects that as no flanging exists at the connection part of the pipe fitting and a pipeline, head loss is avoided when water flow passes by the connection part; and when the pipe fitting and the pipeline are subjected to hot melting bell-and-spigot joint, air in the bell-and-spigot is discharged from the vent holes, so that sold solder joint is not formed at the bottom of the bell-and-spigot, and bubbles are not formed on the solder side of a pipe wall, therefore, the welding quality is not influenced.

Description

Technical field [0001] The invention relates to a novel plastic pipe fitting which can prevent the plastic pipe fittings from forming inward flanging when they are hot-melt and socket connected. Background technique [0002] The inward flanging formed during the hot-melt socket connection of the existing plastic pipe fittings can cause water head loss. Especially the domestic household pipes at the end of the municipal pipe network mostly use plastic water supply pipes, a large number of which are connected by hot-melt socket connection. The water pressure of end users, in order to ensure the water pressure of end users, it is necessary to pressurize the municipal pipe network, which increases energy consumption and increases the cost of water supply companies. Contents of the invention [0003] In order to solve the above problems, the present invention provides a new plastic pipe fitting that can prevent the plastic pipe fittings from forming inward flanging when they a...

AI Technical Summary

Problems solved by technology

[0002] The inward flanging formed when the existing plastic pipe fittings are made of hot-melt socket connection can cause water head loss

Especially the domestic household pipes at the end of the municipal pipe network mostly use plastic water supply pipes, a large number of which are connected by hot-melt socket connection. The water pressure of end users, in order to ensure the water pressure of end users, it is necessary to pressurize the municipal pipe network, which increases energy consumption and increases the cost of water supply companies

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