SU1719774A2 - Heat transfer surface - Google Patents

Abstract

Use: steam boilers. SUMMARY OF THE INVENTION: Heat exchange tubes 1 are made with curved fins 2, 3 having a constant radius of curvature along the length of the tube 1 and are provided with ribs 4 on the convex side. The fins 2, 3 of each tube 1 are convex in one direction, and the adjacent tubes 1 in different directions, which allows the movement of the gas medium to intensify the heat transfer from the latter to the pipes 1 by mixing the gas medium. 1 hp ff, 5 ill.

Description

The invention relates to energy and can be used in the construction of heating surfaces of steam boilers.

The purpose of the invention is to increase the efficiency of heat transfer by improving the thermal conductivity from the fin to the pipe with fins.

FIG. 1 shows a bundle of fin tubes; in fig. 2 ... 5 are embodiments of a fin tube.

The heating surface contains a bundle of parallel heat exchanging tubes 1 with curved fins 2 and 3. Each fin has a constant radius of curvature along the length of tube 1 and is provided with ribs 4 on the convex side, the free edges of the adjacent fins 2 and 3 are offset by an angle of 2-14 ° y in different directions relative to the axis of the row of pipes 1, placed along the coolant flow. Fins 2 and 3 are convex in one direction.

The fins 2 and 3 and the ribs 4 are located adjacent to the corresponding pipe 1 with its concave part. Each fin can be made with bent edges attached to the edges of its rib 4 to form a closed collar tightly covering pipe 1 (Fig. 5). Adjacent fins 2 and 3 are convex in different directions. Fins 2 and 3 can be made of one plate (Fig. 3) attached to the pipe 1 by the middle of the concave side. The pipe 1 can have an eye shaped profile (Fig. 4).

The device works as follows.

The gaseous medium moves with the main flow between the longitudinal rows of pipes 1 and the additional flow between the adjacent fins 2 and 3. The main and additional flows are mixed, which intensifies the heat transfer from the gaseous medium to the outer surface of the pipes 1.

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heat transfer from the fins 4 to the pipes 1 is facilitated by direct contact of the fins 4 with the pipes 1. Making the fins 2 and 3 from one plate (Fig. 3) simplifies the technology of manufacturing the pipe 1, and the formation of the fins 2, 3 by plate and the edges 4 of the closed collar (Fig. 5), tightly covering pipe 1, protects the latter from aeolian wear. The pipes 1 can be made with a complex profile, for example, in the form of an eyelet to increase the area of contact with the fins (Fig. 4).

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Claims (2)

1. Surface heating auth.St. No. 821900, characterized in that, in order to increase efficiency by improving thermal conductivity, the fins and fins are arranged adjacent to the corresponding pipe with their concave part. 2. The surface according to claim 1, from the edge so that each fin is made with bent edges attached to the edges of its rib with the formation of a closed collar tightly covering the tube. one / Fig.Z 2 Fig1 four s FIG 5