SU1404144A1 - Method of securing pipes in holes of tube plate of heat exchanger - Google Patents

Description

(21) 4144308 / 25-27

(22) 11/10/86

(46) 06/23/88, Bull. No. 23

(72) E.N.Krmarov, G.A.Buravtseva,

G.N.Magazinov and I.A.Ignatov

(53) 621.774.72 (088.8)

(56) USSR author's certificate

No. 693102, cl. F 28 F 9/16, 28.01.78.

(54) METHOD FOR FIXING A PIPE IN THE OPENING OF A PIPE GRID OF A HEAT EXCHANGER

(57) The invention relates to the field of engineering and can be used in the design and manufacture of heat exchangers. The purpose is to increase the tightness of the pipe fixing unit in the tube plate of the heat exchanger, which is made by expanding at an operating temperature range that includes temperatures that are lower than the temperature at which the expansion was performed. Before

By installing pipes (T) 2 into the hole of the tube sheet 1, coating (P) 4 of the material is applied to their ends, the linear expansion coefficient of which is less than the pipe material. P 4 is applied successively along the length of the ends of T 2 with P 3 of a material whose linear expansion coefficient is greater than the linear expansion coefficient of the material-pipes. When the temperature of the joint is greater than the temperature at which rolling was performed, P 3 gets an elongation of greater than T 2 and provides additional compaction across its entire outer surface. Claim 4, obtaining a relative elongation of less than T 2, provides a seal across the entire inner surface of T 2. At the joint temperature, the rolling temperature is lower than the rolling temperature, and vice versa. 1 il.

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The invention relates to mechanical engineering and can be used in the design and manufacture of heat exchangers.

The aim of the invention is to ensure the density of the pipes connected to the tube grid not only at the temperature of the attachment unit exceeding the temperature at which the flaring was performed, but also at lower temperatures that are possible under the conditions of the body exchanger operation (for example, heat exchangers).

mennna, cooled by water, the temperature of which is about 0 ° C), i.e. at all values of temperature. in the whole range of operating modes of the heat exchange of the boom. The goal of the invention is to improve the tightness of the connections between the pipes and the tube grid in the operating temperature range of the fixing unit, which includes temperature values lower than those of the IED that the tube flaring was performed.

The drawing shows schematically an assembly for fastening a pipe in a tube sheet. At the same time, the thickness of the plugs from materials with coefficients of a linear distribution with irradiation that are different from the coefficient of linear expansion of the material of the pipe, is shown to be increased, the I B tube grid 1 is drilled

The method of fastening the pipes in the holes of the tube plate of the heat exchanger by expanding them onto

The hole in which tube -2 is inserted and rolled once. In front of the flares-35, the ends of the pipes in the deformation zone in front of the pipe are covered with a pipe by installing them in a pipe hole

from the material, the linear expansion coefficient of which is greater than the linear expansion coefficient of the pipe material, and the coating 4 of the material with a linear expansion coefficient of which is less than the linear expansion coefficient of the pipe material.

the gratings of the coating of material, the linear expansion expansion factor is larger than the coefficient of linear

 expansion of the pipe material, which is characterized by the fact that, in order to increase the tightness of the joint in the working range, the temperature including the temperature values is less than the temperature at which rolling is carried out, before installing them into the tube sheet bore, the coating of the material, the coefficient of linear expansion of which

Each pokrp-ie applied in the area of rolling on the tube at a length equal to half the thickness of the tube.

The fastening of the pipe in the tube sheet is completed in the following way.

If the joint temperature is greater than the temperature, at which the pipe rolling in the tube of the heat exchanger was completed, then the coating 3 receives a relative size more than the tube, and provides additional sealing

VShPI Order 3020/8 Circulation 709

Random polygons pr-tie, Uzhgorod, st. Project, 4

outer surface. Coating 4, obtaining a relative elongation less than the tube, provides additional sealing along its inner surface.

If the temperature of the compound is lower than the temperature at which you

rolling the tubes into the tube of the heat exchanger, then cutting 3, obtaining a relatively larger reduction in its linear size than the tube, the surface crimping it, thereby providing an additional seal on the joint. Coating 4 gets a relatively smaller neck with a change in linear size than the tube, thereby providing an additional thickening of the joint on the outer surface of coating 4.

The technical and economic effect of using the proposed method of fastening pipes in a tube grid of a heat exchanger in the whole range of operating modes and conditions of its operation consists in increasing the reliability of heat exchangers, in particular,

their reliability and service life.

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Claims (1)

Invention Formula The method of fastening the pipes in the holes of the tube plate of the heat exchanger by expanding them onto the ends of the pipes in the deformation zone before installing them in the tube hole gratings of a coating of a material whose linear expansion coefficient is larger than the coefficient of linear expansion of the pipe material, characterized in that, in order to increase the leaktightness of the joint in the working range, the temperature including the temperature values is lower than the temperature at which rolling is carried out, before installing them in the tube sheet aperture, additionally apply a coating of material, the linear expansion coefficient of which less than the linear expansion coefficient of the pipe material, each being applied at a length equal to half the thickness of the pipe lattice. Subscription