CN1348088A

CN1348088A - Expansion jointed corrugated elliptic heat pipe

Info

Publication number: CN1348088A
Application number: CN 00129580
Authority: CN
Inventors: 孟继安
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-10-08
Filing date: 2000-10-08
Publication date: 2002-05-08

Abstract

Expansion jointed corrugated elliptic heat pipe consists of thin-wall expansion jointed corrugated base pipes, sleeved fins and thick-wall sleeve. It has the features including elliptic working cross section of heat pipe with small outer flow resistance and great heat exchange coefficient; close contact between the expansion jointed thin-wall base pipe and the fins resulting in small pipe wall contact heat resistance and small heat conducting resistance; and the corrugation in the base pipes formed while expansion joint capable of reinforcing the working medium inside the pipe and reducing hot stress. The thin-wall base pipe may be manufactured with stainless steel and similar material for anticorrosive capacity and low cost.

Description

Expansion jointed corrugated elliptic heat pipe

The present invention relates to a kind of high efficient heat exchanging element that is used for diabatic process, particularly by managing the elliptic heat pipe that interior expanded joint fits tightly parent tube and suit fin and produces ripple at tube wall.

The internal heat transfer performance of heat pipe is splendid, and the external heat-exchanging of elliptical tube and drag characteristic are better, and therefore, the elliptic heat pipe that has the comprehensive good characteristic of heat pipe and elliptical tube in recent years is used widely in more multi-field.At present, the manufacture method of elliptic heat pipe is: at first the typical circular section heat exchange pipe is rolled into elliptical tube, wears sheet then outside elliptical tube, the oval cross section finned tube is made in whole galvanizing, will form gravity assisted heat pipe in the working media package tube at last.Its main deficiency is a complex process cost height, and combines still defective tightness owing between the reason parent tube of aspects such as technology and fin, and thermal contact resistance is big.

The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of and make the outer suit fin of basic tube and tube firmly fit tightly and on the parent tube wall, produce the two-sided strengthened corrugated elliptic heat pipe of ripple, and its manufacturing cost is lower than the whole galvanizing type of existing usefulness elliptic heat pipe by expanded joint.

The object of the present invention is achieved like this:

(1) is the suit fin with the sheet metal punch forming, then fin is enclosed within on the ellipse shape metal parent tube by shaping round tube, by expanded joint it is firmly fitted tightly with the outer fin of pipe parent tube and form the expansion jointed corrugated elliptic finned tube.Fin and parent tube are fitted closely behind the expanded joint, and thermal contact resistance is less.Parent tube tube wall behind expanded joint produces various ripples, has also strengthened the heat exchange in the pipe.Expansion jointed corrugated elliptic finned tube encapsulation work medium is formed expansion jointed corrugated elliptic heat pipe.In order to guarantee the feasibility of process implementing, parent tube should be selected the light-wall pipe with good plasticity for use.

(2) in order to guarantee the bonding strength of thin-wall metal base pipe and other part, answer the suit heavy casing, and by methods such as expanded joints, it is firm tight that it is engaged at parent tube corresponding site (as two ends and middle part).

The present invention compared with prior art has the following advantages.

(1) fin engages closely with parent tube, and thermal contact resistance is less, and the finned tube tube wall thermal contact resistance of its heat pipe is suitable with rolling bimetallic finned tube.Fin has the effect of the working stress of bearing, and the thin-walled characteristic of parent tube does not reduce the pressure-bearing and the anti-external compression scouring capability of its heat pipe integral body.

(2) the parent tube wall forms various ripples by expanded joint, and strengthening effect is good in the pipe, and also has the little and little good characteristics of thermal stress of tube wall heat conduction thermal resistance of thin-wall corrugated tube simultaneously.

(3) parent tube can adopt materials such as the stronger stainless steel of resistance to corrosion, copper, and fin can adopt steel disc and carry out preservative treatment, thereby has stronger resistance to corrosion.Simultaneously, owing to adopt light-wall pipe, the weight of heat pipe significantly reduces under identical heat exchange area condition, thus the also corresponding reduction of the weight of the unit's of making heat exchange area heat pipe and cost.

Concrete structure of the present invention is provided by following embodiment and accompanying drawing thereof.

Fig. 1 is the structural representation of expansion jointed corrugated elliptic heat pipe.Among the figure, 1 is thin-walled ripple parent tube, and 2 is the suit fin, and 3 is heavy casing.

Above embodiment can further specify as follows:

Expansion jointed corrugated elliptic heat pipe is made up of the thin-walled parent tube 1 with expansion-jointed corrugation, suit fin 2 and heavy casing 3 etc.

In order to reduce the flow resistance of heat transferring medium, the heat exchange working portion of parent tube adopts the elliptic-section shape, and other parts can adopt elliptic-section also can adopt circular cross-section.Parent tube adopts stainless steel, copper etc. to have the thin-wall seamless of good plasticity or the seam welding pipe is arranged, and fits tightly by expanded joint generation plastic deformation and with the fin root, and produces difform ripple.

The fin type have the LL type be adjacent fins part mutually gland and L type be not type such as gland mutually of fin, recommend to select for use the LL type.Fin can be shapes such as circle, ellipse shape, rectangle, square, polygon.Fin can be made with the carbon steel on shiny surface, corrugated, steel alloy, non-ferrous metal thin plate etc., its endoporus can be provided with in length and breadth to or the spiral embossing ripple.Can be provided with and scratch discharge orifice, scratch stream projection on the fin or make petal, to add tyrannical disturbance of plunderring air-flow.

Heavy casing (so-called heavy wall is for the thin-walled parent tube) mainly rises and connects and booster action, and its cross sectional shape can be circular cross-section, also can decide on the design and installation situation for other cross sectional shapes such as elliptic-section or gradual change cross sections.Heavy casing can be connected with parent tube by modes such as expanded joints.

Claims

1, expansion jointed corrugated elliptic heat pipe is made up of the thin-walled parent tube 1 with expansion-jointed corrugation, suit fin 2 and heavy casing 3 etc., and the working sections that it is characterized in that parent tube is ellipse shape; Parent tube produces plastic deformation by expanded joint and fits tightly with fin, and forms difform ripple on the parent tube wall.

2, according to claim 1 described expansion jointed corrugated elliptic heat pipe, it is characterized in that described fin type has LL type and L type etc., recommend to select for use the LL type.

3,, it is characterized in that described fin can be shapes such as circle, ellipse shape, rectangle, square or polygon according to claim 1 described expansion jointed corrugated elliptic heat pipe; Fin surface can be shiny surface, corrugated, with holes or petal etc.