A double pipe flange

Abstract

The invention discloses a double-layer pipe flange, which belongs to the technical field of pipe connection. The double-layer pipe flange includes two combined flanges used in pairs, and each combined flange includes an outer flange, a middle flange and an inner flange that are sequentially sleeved from outside to inside; the inner flange is connected The inner pipe, the middle flange is connected to the outer pipe; the two outer flanges are connected to realize the compression between the outer flange and the middle flange, the compression between the middle flange and the inner flange, And the compression between the two inner flanges; the inner peripheral surface of the outer flange is provided with accommodating grooves, and the accommodating grooves of the two outer flanges are connected; the middle flange is provided with ventilation holes, and the ventilation holes are axially Through the middle flange, the ventilation hole communicates with the receiving groove to form a channel for gas to flow between the inner tube and the outer tube. The double-layer pipe flange provided by the invention can connect the double-layer pipes, and improves the sealing of the joint of the double-layer pipes and the gas fluidity between the inner-layer pipe and the outer-layer pipe, thereby ensuring the safety of the pipe connection.

Description

technical field [0001] The invention relates to a pipeline connection technology, in particular to a double-layer pipe flange. Background technique [0002] Flange connection is an important connection method in pipeline construction. Its working principle is to fix two pipelines on a flange respectively, set a sealing gasket between the two flanges, and connect the two flanges through bolts at the same time. The pre-tightening force makes the two flanges move towards each other respectively, butts the two pipes together, and at the same time compresses the sealing gasket to make the joint seal. [0003] The double-layer pipe usually includes an outer pipe and an inner pipe arranged coaxially. The inner pipe is mainly used to transport dangerous gases, and part of the gas will escape from the inner pipe to the space between the outer pipe and the inner pipe. To prevent this part of the gas from leaking to the outside, it is necessary to ventilate the outer pipe in time; whe...

AI Technical Summary

Problems solved by technology

[0003] The double-layer pipe usually includes an outer pipe and an inner pipe arranged coaxially. The inner pipe is mainly used to transport dangerous gases, and part of the gas will escape from the inner pipe to the space between the outer pipe and the inner pipe. To prevent this part of the gas from leaking to the outside, it is necessary to ventilate the outer pipe in time; when the flange connection is used in the butt joint of double-layer pipes, the installation accuracy and sealing requirements are high, and conventional flanges often appear due to installation errors. The poor sealing of the butt joint and the poor gas flow between the inner pipe and the outer pipe lead to dangerous gas leakage, which reduces the safety of pipeline connection

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