SU476404A1 - Piping connection - Google Patents

Description

one

Connection of pipelines is intended for use in various parts of the engineering industry when the connection is operated in non-stationary thermal conditions.

The known design of the connection of pipelines consists of a monolithic spherical sawn, in a cylindrical shank of which there is a point for joining with the pipeline. When soldering, the gap between the tube and the outer diameter of the groove fills with solder. The joint connection — the creation of a tension in the line of contact between the sphere of the thread and the nozzle cone is done with a flare nut abutting against the shoulder of the nipple and tightening the thread of the fitting.

The known constructions of spherical joints cannot ensure the tightness of the joint with an abrupt change in temperature, since the elastic pre-deformation of the monolithic spherical nipple is small and does not compensate for the changes in the sizes of the coupled parts that occur during non-stationary thermal conditions.

For the same reason, the preliminary deformation of the nipple does not ensure the tightness of the joint with some loosening of the joint tightening. The lack of a smooth transition across the thickness of the shank to the pipe leads to a sharp increase in stiffness, and, consequently, to the concentration of stresses and, ultimately, to a decrease in the fatigue limit of the pipe pipe.

The purpose of the invention is to eliminate these disadvantages. This is achieved by the fact that the spherical nipple is made elastic and through the utterly fillet turns into a cylindrical shank, which has a tapered bevel at its end and is installed on the pipe without a gap.

The gap between the nipple and the pipe in place of the sphere is sealed, for example, with adhesive sealant, solder, etc.

The tightness of the proposed joint is achieved by the metal contact of the sealing surfaces.

Tight connection of the shank of the nipple with the pipe provides reinforcement of the pipeline in its own loaded section with bending loads in the fitting, and the conical part of the shank of the nipple allows to obtain a smooth change in stiffness and, therefore, the minimum stress concentration.

The invention is illustrated in the drawing.

The connection of the pipelines contains a spherical hollow nipple 1, the elastic to the cost of which the sphere passes through a thickened fillet into a cylindrical thin-walled shank, which has a tapered bevel at its end.

The shank of the nipple is installed on the pipe 2 without a gap.

The spherical part of the niple is made of elastic - thin-walled from the side of the conic surface of the counterpart (fitting). After loading the nipple, the pipe is molded along its inner surface, resulting in an elastic two-layer sphere.

The gap between the nipple and the pipe (at the site of the sphere) is sealed with 1 glue-thermometer 3.

The connection is tightened by a cap nut 4 through the support ring 5 with a conical surface on the side of the sphere. Static stresses from tightening are perceived mainly by nilel 1, which is made of high-strength material with a high elastic limit and a linear expansion coefficient close to the linear expansion coefficient of the pipe.

Subject invention

Claims (3)

1. Connection of pipelines by means of a spherical nipple, pressed tightly to the end of the connecting pipeline, characterized in that, in order to collapse thermal deformations and increase the pipeline vibration, the nipple is made elastic and then, through a thickened fillet, a conical conical body with a conical conical body is made with a conical body and a conical body with a conical con. mounted on the pipe without a gap. 2. The connection according to claim 1, characterized in that the end of the attached pipe is located inside the nipple and has the shape of the inner surface of the nipple. 3. Connection on PP. 1 and 2, characterized in that the gap between the nipple and the pipe at the site of the sphere is sealed by filling it with, for example, a glue-sealant.