CN2600780Y

CN2600780Y - High-efficient low thermal resistance high-temp soldering finned tube

Info

Publication number: CN2600780Y
Application number: CN 03220040
Authority: CN
Inventors: 莫祥根
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-02-25
Filing date: 2003-02-25
Publication date: 2004-01-21
Anticipated expiration: 2013-02-25

Abstract

The utility model relates to a high-efficiency low-thermal-resistance high-temperature brazing fin tube which belongs to the heat exchanger technology field. The fin tube is composed with the tube which transfers the heat medium and the fin which winds the tube; the low melting point brazing alloy between the tube and the outer fin forms a filling welded layer. As the melting point of the brazing alloy is lower than the tube and the fin, when the brazing alloy is melted with the electric induction heating method, the melted brazing alloy will infiltrate into the clearances between the tube and the fin; after the clearances are filled and the brazing alloy is cooled, the tube and the outer fin will be combined tightly. The practice indicates the utility model high-efficiency low-thermal-resistance high-temperature brazing fin tube has the advantages of high productivity, low labor strength, and high jointing strength; the thermal resistance can be ignored, so the heat transfer efficiency is high.

Description

Efficient low thermal resistance high temperature brazing finned tube

Technical field

The utility model relates to a kind of tubulose heat-exchange device, and especially a kind of efficient low thermal resistance high temperature brazing finned tube belongs to technical field of heat exchangers.

Background technology

Understand according to the applicant, the finned tube that existing heat exchange is used is by carbon steel, chrome-molybdenum steel, the stainless steel pipe of carrying thermal medium and hold its outer fin formation.The finned tube that machinery suit, metallurgical casting, electric resistance welding form is respectively owing to processing technology complexity, reason such as appearance is coarse, production efficiency is low, and is rarely found.The ratio-frequency welding finned tube has certain market because of production efficiency height, relative cost are low.Yet low, the easy sealing-off of this finned tube rate of deposition influences heat transfer property.Especially the finned tube of chrome-molybdenum steel, stainless steel material because the weld seam of ratio-frequency welding is a continuous weld, when temperature-difference is big in environment for use temperature and the pipe, is very easily thrown off, and has a strong impact on heat transfer property.

Summary of the invention

The purpose of this utility model is: at the deficiency that prior art exists, proposes a kind ofly can guarantee tubing and fin is comprehensive, the efficient low thermal resistance high temperature brazing finned tube of strong bonded, thereby guarantee desirable heat transfer property.

In order to reach above purpose, efficient low thermal resistance high temperature brazing finned tube of the present utility model is by the tubing of carrying thermal medium and hold its outer fin and constitute, and it is characterized in that: described tubing forms filling seam layer by the lower solder of fusing point with holding between its outer fin.

Because the fusing point of solder is lower than tubing and fin, therefore after adopting the electrical induction mode that solder is melted, the solder of fusion will be penetrated in the slit of tubing and fin, and solder and masterbatch counterdiffusion are mutually filled the slit of two mother metal junctions.Treat that the slit fills up, after the solder cooling, can make tubing with hold its outer fin strong bonded.Facts have proved, efficient low thermal resistance high temperature brazing finned tube productivity ratio height of the present utility model, labour intensity is low, the weld strength height, heat the rate height, thermal resistance almost can be ignored, so the heat transfer efficiency height.Finned tube effect for chrome-molybdenum steel, stainless steel material is more obvious.

Description of drawings

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

Fig. 1 is the structural representation of an embodiment of the utility model.

The specific embodiment

Embodiment one

The efficient low thermal resistance high temperature brazing finned tube of present embodiment is that L shaped ring fin 3 combines by the tubing 1 of carrying thermal medium with holding its outer cross section as shown in Figure 1.During manufacturing, ring fin 3 is nestable outside tubing 1, and the cored solder wire that fusing point is lower than tubing 1 and fin 3 is looped around outside the fin.When by induction coil, the induced-current that fin 3 produces makes the cored solder wire fusion, flows between tubing 1 and the fin 3 and in the slit between the adjacent fins 3, forms and fills seam layer 2, makes tubing 1 and fin 3 strong bonded.

Experimental results show that, present embodiment production efficiency height, labour intensity is low, the weld strength height, and bond strength can reach 24～27Kg/mm under the normal temperature, bond strength under 750 ℃ of high temperature also can reach 4.2～4.8Kg/mm, rate of deposition is up to more than 98%, and maximum operation (service) temperature can reach 750～850 ℃, and thermal resistance almost can be ignored, rolling approaching with integral body, the heat transfer efficiency height.

In addition to the implementation, the utility model can also have other embodiments.For example, according to different technological requirements, can adopt different solders.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of the utility model requirement.

Claims

1. efficient low thermal resistance high temperature brazing finned tube by the tubing of carrying thermal medium with hold its outer fin and constitute, is characterized in that: described tubing forms filling seam layer by the lower solder of fusing point with holding between its outer fin.

2. according to the described efficient low thermal resistance high temperature brazing finned tube of claim 1, it is characterized in that: described fin is the L shaped ring fin in cross section.

3. according to the described efficient low thermal resistance high temperature brazing finned tube of claim 2, it is characterized in that: described ring fin is nestable outside tubing, and described solder forms between tubing and fin and in the slit between the adjacent fins fills the seam layer.