SU805040A1 - "pipe in pipe"-type heat exchanger - Google Patents

Description

one

The invention relates to the field of heat exchange and can be used in refrigeration engineering.

Ivavshtsha heat exchangers of the type of pipe in the pipe, the inner of the cototre sjajena ribs in contact with the inner surface of the outer pipe, containing an annular opening at the entrance to the interfacial space; An integral cross-section camera, decreasing in direction to the annulus entrance, and a connecting pipe, connect the adapter to the chamber 1.

The disadvantage of these heat exchangers is that it is technically difficult to manufacture them and is of low operational reliability.

The purpose of the invention is to simplify manufacturing technology and increase operational reliability.

This goal is achieved by the fact that the chamber is made in a longitudinal section of a stepped shape with the formation of mixing and throttling steps, the ribs are made longitudinal to divide the annular space into isolated channels, with the mixing stage having a cross-section more than 4-6 times the throttling area and 10-15 times the area cross-section of the pipe, and the area of throttling

steps are more than 1.3-1.5 times the total area of the channels.

FIG. 1 shows a heat exchanger; general view; in fig. 2 is a section A-A in FIG. one; in fig. 3 - section bb

in fig. one.

The heat exchanger contains an outer tube 1 in which the inner tube 2 is placed, provided with fins 3 and in contact with the inner surface of the outer tube 1, an annular distribution chamber 4 at the inlet to the annular space having a cross section that decreases in the direction towards the annular entrance to the inlet pipe 5 connected to the chamber 4, made in the longitudinal section of the stepped form with the formation of the mixing stage 6 and throttling

steps 7. The ribs 3 are made longitudinal to divide the annulus into isolated channels 8 and the cross-sectional area of the mixing stage 6 is 4-6 times

more than throttling area 7 and 8 is 10-15 times the size of the cross section of the pipe 5, and the area of the throttling stage is 1.3-1.5 times larger than the 4-dimensional area of the channels 8. At the ends, the heat exchanger is provided with flanges 9, 10 to which through a seal gaskets 11 are connected by side covers 12, 13 attached to the nozzles 5 and provided with openings 14 for supplying and discharging the medium, flow through pipe 2, the inner surface of which is provided with a rib 15.

The heat exchanger operates as follows.

One of the mediums — liquid — through the nozzle 5 enters the mixing stage b of the distribution chamber 4 where the speed decreases and the flow of liquid is flowed, then through the throttling stage 7 with the increased speed the liquid is evenly distributed through the channels 8 from which it enters the closed ( XS% eM formed by the flange 10 and KS # 3SKoR 13. Another medium, steam, enters the inner tube 2 through the hole 14 and is withdrawn from it through the same hole in the lid 13. The heat heat between the media is carried out through the wall of the inner pipe. 2. This, due to the optimally selected ratios of the dimensions of flow sections of mixing stage b, throttling stage 7, channels 8 and nozzle 5, the cut is evenly distributed through channels 8 due to the optimal organization of the velocity pressures of its daylight, the inadmissibility of significant pressure changes and there is a samial preventing local vaporization in channels 8, which ensures the skimming of the heat exchanger reliability.

Claims (1)

1. Patent ShA No. 3020026, .kl. 165-156, published in 1968. Fi.1 8th