CN2252975Y

CN2252975Y - Inner spiral combined fin pipe

Info

Publication number: CN2252975Y
Application number: CN 96231551
Authority: CN
Inventors: 裘应维; 蒋兆颐; 邹德祥
Original assignee: CHANGSHU METROLOGICAL MEASURING INSTITUTE
Current assignee: CHANGSHU METROLOGICAL MEASURING INSTITUTE
Priority date: 1996-03-28
Filing date: 1996-03-28
Publication date: 1997-04-23
Anticipated expiration: 2006-03-28

Abstract

The utility model relates to an inner spiral combined fin pipe, comprising a pipe main body 1, fin sheets 2 which are arranged on the outer wall of the pipe main body and a screw rod 3 which is placed in a mould cavity of the pipe main body 1. The utility model has the advantages of reasonable structure, good heat exchange effect, energy saving, etc.

Description

Inside spin combination extended surface tube

The utility model relates to a kind of inside spin combination extended surface tube, particularly is suitable for being used as heat transfer tube in the heat-exchange system of fuel oil and combustion gas class warm-air drier and the gas-gas heat reclamation device.

The heat-transfer tube that is adopted in existing warm-air drier and gas-gas heat reclamation device is generally inner helix pipe or swirlyflow tube, and the former exists the lower defective of outer wall heat transfer efficiency, and the latter exists the defective of difficulty of processing.At present, in the heat reclamation device of station boiler, adopted a kind of novel extended surface tube, its structure is the helical fin of welding on the tube wall of high-voltage tube, and water flowing in pipe is then conducted heat by fin again, the heat exchange effect of this structure is better, but if ventilate in pipe, because the air thermal conductivity far is lower than water, and air-flow often is laminar condition in the pipe, cause the transmission speed of tube wall heat to be significantly less than fin, influenced the heat transfer efficiency of extended surface tube.

The purpose of this utility model is that a kind of rational in infrastructure, good effect of heat exchange, energy-conservation inside spin combination extended surface tube will be provided.

The purpose of this utility model is achieved like this, a kind of inside spin combination extended surface tube, and it includes tube body 1, is arranged on the fin 2 on tube body 1 outer wall, has now done improvement, is placed with screw rod 3 in the die cavity of tube body 1.

Below in conjunction with accompanying drawing the utility model is further described below

Fig. 1 is a partial cross-sectional perspective view of the present utility model

Fig. 2 is a fundamental diagram of the present utility model.

Fin 2 of the present utility model is welded on the outer wall of tube body 1 by frequency spiral fin welding equipment, and the setting of fin 2 is shape in the shape of a spiral; Screw rod 3 is processed into spirality and directly is placed in the die cavity of tube body 1, and the size of screw rod 3 can be determined according to the die cavity internal diameter of tube body 1.After the utility model is assemblied on the warm-air drier, when the end of the air that heats by tube body 1 enters in the die cavity, under the effect of screw rod 3, inner air tube shape motion in the shape of a spiral, tube wall generation sharp impacts with tube body 1, produce heat exchange efficiently,, heat is dispersed on the outer wall and fin 2 of tube body 1 by tube wall again the heat transferred tube wall; At this moment, the outer cold wind that is arranged in above the tube body 1 of pipe passes from helical fin 2, contact with the outer wall of fin 2 and tube body 1 simultaneously, produce heat exchange efficiently, in this process because cold wind and the outer wall of tube body 1 and the contact area between the spiral fin 2 increase thereby also raising greatly of heat exchange amount greatly.

The utility model can make air fully mixed disturbing in the die cavity of extended surface tube of heating owing to be provided with screw rod 3 in the die cavity of tube body 1, with tube wall heat exchange efficiently takes place, with the outer wall and the helical fin of heat transferred tube body; Simultaneously, between the outer wall of cold wind and tube body and the helical fin heat exchange takes place, because the contact area increase, thereby can improve the heat exchange efficiency of heat-transfer tube greatly and save the energy.

Claims

1, a kind of inside spin combination extended surface tube, it includes tube body (1), is arranged on the fin (2) on tube body (1) outer wall, it is characterized in that being placed with in the die cavity of tube body (1) screw rod (3).