RU30960U1 - Coiled fin section - Google Patents

Description

Section is silver coiled.

The utility model relates to the field of heat exchange technology and can be used in heating and ventilation systems, in particular, preheating the air in front of the air heater in power boilers.

Known air heater containing the beam in turn

intersecting rows of pipes arranged with regulated relative transverse and longitudinal steps and fixed in the distributing and collecting manifolds, equipped respectively with supply and outlet pipes and covering the bundle from the outside, pipes of even rows are made with ribbing 1.

The disadvantage is the complexity of the design.

Known air heater containing a housing with two groups of pipes placed inside, each of which is connected to the distributing and collecting compartments of the collectors located on the side walls of the housing and equipped with bypass compartments, each pipe is made coil with an external fin 2.

The disadvantage is the complexity of the design and metal consumption.

Closest to the claimed is a finned coil section, containing inlet and outlet chambers arranged vertically, heat transfer elements made in the form of pipes with a loop-galvanized galvanized ribbing perpendicular to the longitudinal axis of the pipe, placed in transverse rows on the outer surface of the pipes, resting on special combs, which welded to the corners, as well as bends of silver pipes made by smooth and closed baffles to prevent air passage in addition to the silver part.

A disadvantage of the known one consists in the laboriousness of the manufacture of filler elements with loop-wire fins and their subsequent hot-dip galvanizing; in a low coefficient of thermal conductivity of the fin material; greater exposure to contamination and difficulty in cleaning; more mass.

The objective of the utility model is to increase the efficiency of heat transfer, reduce aerodynamic drag, reduce mass due to the implementation of heat-releasing elements with spiral-rolling or spiral-wound fins made of aluminum and other materials of lower mass, improving the purpose and ease of maintenance.

This task is achieved by the fact that in the section of the silver serpentine, containing inlet and outlet chambers located vertically, heat-transfer elements made in the form of tubes with fins placed in transverse rows on the outer surface of the pipes, supported by special combs that are welded to the corners, and containing bends and rolls of silver pipes, made smooth and closed by deflectors, according to a utility model, heat transfer elements are made in the form of pipes with spiral-rolled or spiral-wound orifice by friction from a material with a high coefficient of thermal conductivity, having an angle of inclination of the fins with respect to the perpendicular axis of the heat transfer element O ... 3.35 °, finning pitch 2.8 ... .5.0 mm, rib height 8.0 ... 11 , 5mm, fin diameter 34 .. .39mm. Spiral-finning can be made of aluminum, while the mass of the section of silver is reduced by 26%.

Improving the heat transfer efficiency is achieved by making the heat exchange surface of a material with a high coefficient of thermal conductivity and the declared geometry of the fins, which leads to a decrease in aerodynamic resistance, due to the shape of the fins, the heating surface is less prone to contamination and easier to clean.

In FIG. 1 - shows the fin section coil

Figure 2 - shows a heat-releasing element made spiral helical finning

In Fig.Z - shows a heat-releasing element, made spiral-finning

The finned coil section of Fig. 1 contains an inlet 1 and an outlet 2 chambers arranged vertically, heat transfer elements 3 of Fig. 2,3 made in the form of tubes with a spiral-rolling or spiral-wound fins, having an angle of inclination of the fins with respect to the perpendicular axis of the heat transfer element f 0 ... 3.350, finning step t 2.28 ... 5.0 mm, height

ribs h 8.0 ... 11.5mm, fin diameter 0 34 ... 39mm 2, based on special combs 4, which are welded to the corners 5, bends 6 and barrels 7 of silver pipes, made smooth and closed by deflectors 8 to allow passage air only on the silver part of the heat-transfer beam section. From sections of silver-coiled silver chambers between each other, vertical heaters are made up of a different number of sections, depending on the heating surface required by the calculation.

Coiled silver section works as follows:

In the process, there is heat exchange between the medium flowing inside the heat-releasing elements 3 and the heat carrier flow washing it in the transverse direction.

The coolant is supplied to the inlet chamber 1, which enters the heat-releasing elements 3, made in the form of pipes with spiral-rolling or spiral-wound fins with smooth pipe outlets 6 and cams 7 and are discharged from the section through the outlet chamber 2. The deflectors 8, closing the tubs and pipe bends provide air passage only along the silver part of the heat-transmitting beam section.

A stream of air washes the heat-releasing elements 3 from the outside, removing heat transferred by the heating medium.

Table 1 shows the data of comparative tests on aerodynamic drag with spiral-rolling finning of pipes.

Table 1

List of information used

1.A.S. 1413380 F 24 N 3/08 Air heater

2.A.s. 1384892 F 24 N 3/08 Air heater

3. Coiled silver section, type СО-110-01. Passport K 448-ShS. Ministry of Energy and Electrification of the USSR. Tyumen Turbomechanical Plant, 1978. 14 sheets.

1. Coiled silver section, containing inlet and outlet chambers arranged vertically, heat-transfer elements made in the form of tubes with fins placed in transverse rows on the outer surface of pipes resting on special combs that are welded to the corners, and also containing branches and grooves of silver pipes made smooth and closed by baffles, characterized in that the heat-releasing elements are made in the form of pipes with a spiral-rolling or spiral-wound fins from a material with a high coefficient heat conductivity having an angle of inclination of the fins in relation to the perpendicular axis of the heat transfer element O ... 3.35 °, finning pitch 2.8 ... 5.0 mm, rib height 8.0 ... 11.5 mm, fin diameter 34 ..39mm.

2. Section ... according to claim 1, characterized in that the spiral-rolling fins can be made of aluminum.

Formula C e / g c c / o / eS / b &&&& i s e u e / i & D & i

Claims (2)

1. The finned coil section, containing inlet and outlet chambers arranged vertically, heat-transfer elements made in the form of tubes with fins, placed in transverse rows on the outer surface of the pipes, resting on special combs that are welded to the corners, and also containing taps and grooves of finned pipes made smooth and closed by baffles, characterized in that the heat-releasing elements are made in the form of pipes with a spiral-rolling or spiral-wound fins from a material with a high coefficient heat conductivity having a tilt angle of the fins with respect to the perpendicular axis of the heat transfer element 0-3.35 °, finning pitch 2.8-5.0 mm, rib height 8.0-11.5 mm, finning diameter 34-39 mm. 2. Section according to claim 1, characterized in that the spiral-rolling fins can be made of aluminum.