RU1782690C - Method of securing pipe in part hole - Google Patents

Abstract

Use: for the production of heat exchangers and steam boilers. SUMMARY OF THE INVENTION: Three grooves are made on the surface of an opening of a part, the last of which are conical with vertices directed towards one another. The pipe installed in the hole is first distributed in areas corresponding to the extreme grooves, and then in the middle groove section. 1 ill.

Description

The invention relates to the production of heat exchangers and steam boilers, can be used in the manufacture of heat exchangers operating in a chemically aggressive environment.

There is a known method of fastening a pipe in a part opening, in which grooves are made on the surface of the hole, the pipe is inserted into the part hole and the pipe sections are distributed into the grooves by applying pressure created by detonating explosive charges to the inner surface of the distributed sections of the pipe. In this case, the grooves are cylindrical and the grooves are filled simultaneously. The disadvantages of this method of fastening are their low strength and tightness, making it unsuitable for fastening pipes in tube sheets of heat exchangers operating under conditions of vibration and a chemically aggressive environment. The disadvantage is due to the fact that when attaching this method

no permanent radial tension of the pipe is created in the fastening portion pressing it against the surface of the part.

In the proposed technical solution, three grooves are made on the surface of the hole of the part, while the extreme grooves are made conical, facing one another with their vertices, the pipe is installed in the hole of the part, and sections of the pipe are distributed first into the extreme grooves, and then, after filling the extreme grooves, distribute a portion of the pipe into the middle groove. By distributing the pipe section into the middle groove, the axial tension of the pipe is created in the sections between the middle and extreme grooves, resulting in radial tension of the pipe sections located on the conical surfaces of the extreme grooves, which ensures their tight fit to the conical surfaces of the grooves with increased strength and tightness of the joint.

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Fixing the pipe into the hole of the part according to this method can be carried out using the cylindrical explosive chamber shown in the drawing, where the following designations are introduced: 1 - part, 2 - pipe, 3

- cylindrical explosive chamber, 4 - explosive charge, 5 - blasting bridge, b - conical groove, 7 - middle groove, 8-seal, 9-perforation, 10

-up. The blast chamber is made in two forms - with perforations against the conical grooves and with perforations against the middle groove. The outer diameter of the blasting chamber is equal to the inner diameter of the pipe, the stop serves to fix the blasting chamber in the pipe in the desired position. The distribution of the pipe is carried out by the action of explosion products flowing through

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perforation. In the drawing (1 a) the pipe is shown before distribution, on (16) - after distribution in the extreme grooves, on (1c) - after distribution in the middle groove.

Claims (1)

SUMMARY OF THE INVENTION A method of fastening a pipe in a hole of a part, in which three grooves are made on the surface of the hole, install the pipe in the hole of the part and distribute pipe sections into the extreme grooves, characterized in that, in order to increase the strength and tightness of the joint, after filling the extreme grooves distribute a portion of the pipe into the middle groove, while the extreme grooves are conical, facing one another with their peaks.