Welding-free pipeline joint

Abstract

A welding-free pipeline joint comprises an O-shaped ring, a nut, a connecting piece, a pressing sleeve and pipelines, a through hole penetrates through the interior of the connecting piece, the diameters of holes in the two ends of the connecting piece are matched with the diameters of the pipelines on the two sides, a stop step is arranged in the middle of the inner side of the connecting piece, notches are formed in the two ends of the inner side of the connecting piece, and a hexagonal standard nut is arranged in the center of the outer side of the connecting piece. Threads are prepared at two ends outside the connecting piece; the pressing sleeve is a ferrule with a stop edge step, the inner diameter of the ferrule is matched with and accommodates the pipelines on the two sides, and the outer diameter of the ferrule is accommodated by notches formed in the two ends of the inner side of the connecting piece. Sealing rings are mounted at the end parts of the ferrules, and are plugged in gaps formed in the two ends of the inner side of the connecting piece; the nut is provided with a stop edge step, threads of the nut are meshed with threads prepared at the two ends of the outer side of the connecting piece, and the stop edge step of the nut tightens the outer edge of the pressing sleeve when rotating. The front end of the pressing sleeve and the O-shaped ring are tightly squeezed, and the O-shaped ring deforms to form a sealing cushion layer between the outer side of the pipeline and the inner side of the connecting piece.

Description

Technical Field

[0001] The utility model relates to a pipeline joint, in particular to a welding-free pipeline joint. Background Art

[0002] Pipelines are required for fluid transportation in chemical plants and other places. When a pipeline leaks, it is necessary to quickly repair the leak without stopping work, replacing it, or starting a fire. Instead, the pipe needs to be replaced and a joint needs to be installed. Generally, two pipelines can be connected through a flange joint. CN104279383A discloses a threaded flange, which includes a flange body, a plurality of mounting holes are provided circumferentially on the flange body, and a pipeline hole is provided in the middle of the flange body. The pipeline hole includes an upper pipeline hole, a middle pipeline hole, and a lower pipeline hole. The diameter of the upper pipeline hole is larger than the diameter of the lower pipeline hole. The inner wall of the lower pipeline hole is provided with an internal thread. The flange body is made of titanium steel material, and the outer surface of the flange body is provided with a galvanized layer. The threaded flange has the advantages of convenient connection and can avoid leakage.

[0003] The pipes on both sides are welded to the flanges, and the two flanges are axially connected by bolts. The existing pipe and the flange joint are an integrated part, and it is not easy to axially align the connecting part of the flange joint with the mounting part of the mounting base. Utility Model Content

[0004] The utility model aims to provide a pipe joint with low cost and rotatable circumferential connection for convenient connection in view of the current status of the prior art. In particular, the pipe joint does not require flanges and can be easily disassembled and assembled with only a wrench tool. It can be suitable for soft or hard sealing rings, which is convenient for selection during sealing.

[0005] The technical scheme of the utility model is: a welding-free pipe joint, comprising an O-ring, a nut, a connector, a compression sleeve and a pipe (generally an externally connected pipe), the connector is penetrated with a hole, the apertures of the holes at both ends are matched to accommodate the pipes at both sides, a stop step is provided in the middle of the inner side of the connector, notches are provided at both ends of the inner side of the connector, the center of the outer side of the connector is a hexagonal standard nut (diameter), and threads are prepared at both ends of the outer side of the connector; the compression sleeve is a ferrule with a stop step, the inner diameter of the ferrule is matched to accommodate the pipes at both sides, and the outer diameter of the ferrule is accommodated by the notches provided at both ends of the inner side of the connector; a sealing ring is installed at the end of the outer diameter of the ferrule, and the sealing ring is plugged in the notches provided at both ends of the inner side; the nut is a nut with a stop step, the thread of the nut is meshed with the thread prepared at both ends of the outer side of the connector, and the stop step of the nut tightens the outer edge of the compression sleeve when rotating; the front end of the compression sleeve is squeezed tightly with the O-ring, and the deformation of the O-ring can form a sealing cushion layer between the outer side of the pipe and the inner side of the connector.

[0006] The length of the inner notch (cavity, forming a step) is 5-35 mm.

[0007] The pressing sleeve is a ferrule with a stop edge step, and the diameter of the stop edge step of the ferrule is larger than the outer diameter of the connecting piece, but smaller than the diameter of the notch.

[0008] Beneficial effects: One application scenario is that if a chemical plant pipeline leaks and the factory does not want to shut down for replacement or start a fire, the welding-free joint of the utility model can be used: saw off 4 to 5 cm of the pipe with the leak and install the joint (select the joint of the same model and specification, i.e. the outer pipe). The pipes to be connected do not need to adopt a structure in which the pipe and the flange joint are one piece. The length requirements of the flange and the pipe fitting are very precise. The welding-free joint of the utility model has a certain adjustment range for the length of the external pipe. The utility model is a pipe connection joint that can be easily disassembled and assembled with only a wrench tool. It can also be applied to soft or hard sealing rings, which is convenient for selection when sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a cross-sectional view of the structure of the utility model. DETAILED DESCRIPTION

[0010] As shown in the figure, the pipe joint includes an O-ring 5, a nut 4, a connector 3, a compression sleeve 2 and a pipe 1 (generally an external pipe). The connector is perforated inside, and the apertures of the holes at both ends match the pipes on both sides. A stop step is provided in the middle of the inner side of the connector, and the external pipe can be against the stop step or not. 4 to 5 cm of the pipe with a leak can be sawed off, and there is a certain adjustment margin when installing the connector; cylindrical cavity-shaped notches are provided at both ends of the inner side of the connector, and a hexagonal standard nut (with different standard specifications for diameter) is provided in the center of the outer side of the connector. The two ends of the outer side of the connector are made of The sleeve is provided with a thread; the pressing sleeve is a ferrule with a stop step, the inner diameter of the ferrule matches to accommodate the pipes on both sides, and the outer diameter of the ferrule is accommodated by the notches provided at both ends of the inner side of the connector; the stop step of the ferrule is tightened and contacted with the nut, and a sealing ring is installed at the end of the outer diameter of the ferrule, and the sealing ring is plugged into the notches provided at both ends of the inner side; the nut is a nut with a stop step, the thread of the nut is meshed with the thread prepared at both ends of the outer side of the connector, and the stop step of the nut tightens the outer edge of the pressing sleeve when rotating; the front end of the pressing sleeve is squeezed tightly with the O-ring, and the deformation of the O-ring can form a sealing cushion layer between the outer side of the pipe and the inner side of the connector.

[0011] The overall length of the joint connector is more than 60mm, with a central axial through hole. The through hole is used to install the pipe to be connected and is inserted from both ends of the connector of the weld-free pipe joint after being covered by an O-ring (or other types of sealing rings). Until the stop step is provided in the middle of the inner side of the connected part, the O-ring (or other sealing ring) is inserted into the gap, and the gap steps provided at both ends of the inner side of the connected part are blocked. The front end of the press sleeve is inserted into the above gap, against the sealing ring, and the nut is screwed to the thread of the connecting part. The side stop step of the nut tightens the rear end of the press sleeve when rotating. There are gaps at both ends of the inner side of the connected part. The length of the inner gap (forming an inner cavity with a step) is preferably 10-25mm; the press sleeve is a ferrule with a side stop step, and the diameter of the side stop step of the ferrule is larger than the outer diameter of the connecting part, but smaller than the diameter at the gap.

[0012] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments. Without departing from the purpose and spirit of the claims of the utility model, any simple changes, modifications and other changes to the structure of the utility model belong to the protection scope of the utility model.

Claims

1. A weld-free pipe joint, characterized in that: It includes an O-ring, a nut, a connector, a pressing sleeve and a pipe. The connector is perforated inside, and the apertures of the holes at both ends of the connector are matched to accommodate the pipes on both sides. A stop step is provided in the middle of the inner side of the connector, and notches are provided at both ends of the inner side of the connector. The center of the outer side of the connector is a hexagonal standard nut, and threads are prepared at both ends of the outer side of the connector; the pressing sleeve is a ferrule with a stop step, the inner diameter of the ferrule is matched to accommodate the pipes on both sides, and the outer diameter of the ferrule is accommodated by the notches provided at both ends of the inner side of the connector; a sealing ring is installed at the end of the ferrule, and the sealing ring is plugged in the notches provided at both ends of the inner side of the connector; the nut is a nut with a stop step, and the thread of the nut is meshed with the thread prepared at both ends of the outer side of the connector, and the stop step of the nut tightens the outer edge of the pressing sleeve when rotating; the front end of the pressing sleeve is squeezed tightly with the O-ring, and the deformation of the O-ring can form a sealing cushion layer between the outer side of the pipe and the inner side of the connector.

2. The weld-free pipe joint according to claim 1, characterized in that: The length of the inner notch is 5-35 mm.

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