CN201233194Y

CN201233194Y - Double-layer metal composite fin tube

Info

Publication number: CN201233194Y
Application number: CNU2008200521193U
Authority: CN
Inventors: 刘建安
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-01-18
Filing date: 2008-01-18
Publication date: 2009-05-06
Anticipated expiration: 2018-01-18

Abstract

The utility model relates to a double-layered composite metal finned tube (double-layered tube for short). A trapeziform, rectangular, triangular or semi-circular spiral through groove (3) is annularly arranged on the inner wall of an external tube (1) of the double-layered tube, and an internal tube is combined with the grooved, rolled external spiral fin tube (1) to form the double-layered tube. The double-layered tube has the advantages of double-layered protection, enhanced tube strength, corrosion resistance, prevention of leakage and mixture, enlarged heat-dissipating area, high cooling efficiency, etc. The double-layered tube is generally used in forced-oil circulation water coolers dedicated to power equipment and transformers as well as heat exchangers strictly preventing the mixture of two media in other fields.

Description

The double-level-metal composite fin tube

Technical field:

The utility model belongs to the element of power equipment and transformer usefulness forced oil and water cooled type oil cooler, is a kind of double-level-metal composite fin tube, also is applicable to the cooler that other field has strict antiseep to require to two media.

Background technology:

At present, the used a kind of bimetallic tube of water cooler is that the inwall of fin outer tube 1 has several longitudinal grooves 8, be composited by the fin outer tube 1 of interior pipe 2 with the process fluting, its weak point is: because the inwall of outer tube 1 opens is several vertical shallow trench 8, after interior pipe 2 and outer tube 1 are compound, shallow trench 8 is all tamped by interior pipe 2 extruding, the interior pipe 2 of bimetallic tube is in the same place with water side pipe plate 5 hole expanded joints with also corresponding with cooler respectively oily side pipe plate 4 holes of outer tube 1 in addition, so existing water cooled double-layered pipe inner and outer pipes can be one by further expanded joint extruding, in case seepage takes place in pipe 2 or outer tube 1 in the cooling, this bimetallic tube can't play by cooling tube groove 8 leakage medium is drained into effect outside the cooler grease chamber, the leakage detector 7 that so is installed in cooler isolation ward 6 sides does not just have the warning effect yet, even because cooling tube breaks and can not get timely warning, water is mixed in the oil will cause the transformer major accident.

Summary of the invention:

The purpose of this utility model is the weak point that is to avoid in the above-mentioned prior art, and provides a kind of performance more reliable, can play double shielding; can improve tubing intensity again; prevent two kinds of leakage medium mixing, increase area of dissipation, the double-level-metal composite fin tube that heat transfer efficiency is high.

The purpose of this utility model can reach by following technique measures: draw trapezoidal with special-purpose machines and tools or rectangle or triangle or semicircle spiral groove 3 and with rolling outer tube 1 helical fin of special mechanical equipment (low wing or high wing) at outer tube 1 inwall, insert moulding outer tubes 1 and with the isolated plant drawing or with special pressure equipment composite double layer metal fin pipe by interior pipe 2.

Compared with the prior art the utility model has following advantage:

1, because the outer tube 1 inwall annular design of bimetallic tube is trapezoidal or rectangle or triangle or semicircle spiral groove 3, present embodiment is laid on outer tube 1 inwall with trapezoid spiral groove 3 and describes, when interior pipe 2 and outer tube 1 compound and with the radiator tube plate expanded joint after, spirality groove 3 between the tube and tube can not stop up, suppose that interior pipe 2 of cooling or outer tube 1 seepage take place will leakage medium be drained in the cooler isolation ward 6 by trapezoidal groove 3, in time report to the police by leakage detector 7, so just Accident of Transformer can not take place.

2, because the interior pipe 2 or outer tube 1 material of bimetallic tube are copper pipe, or copper alloy tube, or monel pipe, or stainless steel tube, or steel pipe (interior pipe 2) and steel pipe (outer tube 1), or copper pipe (interior pipe 2) and aluminium-alloy pipe (outer tube 1), or steel pipe (interior pipe 2) and aluminium-alloy pipe (outer tube 1), be that above-mentioned metal inner pipe 2 carries out tight compound formation with outer tube 1, therefore under special water quality and higher hydraulic pressure situation, the utlity model has corrosion-resistant, anti-leak is mixed, the intensity height, long service life and heat transfer efficiency advantages of higher, therefore this double-level-metal composite fin tube will have the prospect of using widely on equipment such as water cooler and aerial cooler.

Description of drawings:

Accompanying drawing illustrates as follows:

Fig. 1 is water cooler tube sheet and the utility model bimetallic tube expanded joint structural representation;

Fig. 2 is the existing cooling of a water cooler outer tube longitudinal section schematic diagram;

Fig. 3 is the existing cooling of a water cooler outer tube cross sectional representation;

Fig. 4 is the utility model cooling outer tube longitudinal section schematic diagram;

Fig. 5 is the utility model cooling outer tube cross sectional representation;

Fig. 6 is the utility model vertical section structure schematic diagram;

Fig. 7 is the utility model cross-sectional structure schematic diagram.

The specific embodiment:

The utility model is described in further detail below in conjunction with drawings and Examples:

With reference to Fig. 1, Fig. 4, Fig. 5, Fig. 6, Fig. 7, the metal inner pipe 2 and the outer tube 1 of present embodiment all adopt copper pipe, and draw trapezoid spiral groove 3 with specific purpose tool at outer tube 1 inwall, the outer ring of outer tube 1 is with the rolling helical fin of special-purpose rolling tube equipment, expanded joint is carried out in outer tube 1 and cooler oil side pipe plate 4 holes, again interior pipe 2 is inserted that outer tubes 1 usefulness special-purpose machines and tools draw or with special pressure equipment composite double layer metal fin pipe, interior pipe 2 carries out expanded joint with water side pipe plate 5 holes, the material of bimetallic tube, the selection of caliber size and wall thickness is according to cooler design pressure medium, temperature, specification requirements such as water quality and deciding.

Claims

1, double-level-metal composite fin tube, it is characterized in that: be periphery trapezoidal or rectangle or triangle or semicircle spiral groove (3) and at the rolling spirality fin in pipe outer ring at outer tube (1) inwall, fin can be low wing or high wing, by interior pipe (2) and process fluting and rolling helical fin outer tube 1 compound formation.

2, double-level-metal composite fin tube according to claim 1 is characterized in that: bimetallic tube is by pipe (2) and the compound formation of copper fin outer tube (1) in the copper.

3, double-level-metal composite fin tube according to claim 1 is characterized in that: bimetallic tube is by pipe (2) and the compound formation of copper alloy fin outer tube (1) in the copper alloy.

4, double-level-metal composite fin tube according to claim 1 is characterized in that: bimetallic tube is by pipe (2) and copper fin outer tube 1 compound formation in the copper alloy.

5, double-level-metal composite fin tube according to claim 1 is characterized in that: bimetallic tube is by pipe (2) and the compound formation of copper fin outer tube (1) in the stainless steel.

6, double-level-metal composite fin tube according to claim 1 is characterized in that: bimetallic tube is by pipe (2) and the compound formation of copper fin outer tube (1) in the monel.

7, double-level-metal composite fin tube according to claim 1 is characterized in that: bimetallic tube is by pipe (2) and the compound formation of stainless steel fin outer tube (1) in the stainless steel.

8, double-level-metal composite fin tube according to claim 1 is characterized in that: metal inner pipe (2) and outer tube (1) can be selected steel pipe and steel pipe or copper pipe and aluminium-alloy pipe or steel pipe and the compound formation of aluminium-alloy pipe for use.