CN202582317U - Thorn-type U-shaped flat pipe - Google Patents

Abstract

The utility model discloses a thorn-type U-shaped flat pipe. The thorn-type U-shaped flat pipe comprises a pipe body, wherein the cross section of the pipe body is flat; and the longitudinal section of the pipe body is U-shaped. The thorn-type U-shaped flat pipe is characterized in that opposite thorns on two straight surfaces are arranged in a staggered way; an arc surface opposite to the short axis of the pipe body is a smooth surface; and the ratio of the height of the thorn to the length of the short axis of the pipe body is e, wherein the e is more than or equal to 1/6 and is less than 1. The thorn-type U-shaped flat pipe is high in heat exchange efficiency and long in service life, and is applicable to various types of flow media heat exchangers.

Description

Sting protruding formula U type flat tube

Technical field

The utility model relates to a kind of protruding formula U type of thorn flat tube that is applicable to all kinds of flow media heat exchangers, is particularly useful in the vehicle engine exhaust gas cooling EGR.

Background technology

In the vehicle engine exhaust gas cooling EGR, the heat exchange tubing of installing usually has normal straight tube, helical groove straight tube, spiral-groover U-shaped flat tube, and wherein, normal straight tube heat exchange weak effect does not reach desirable environment protecting.Though the helical groove straight tube forms the turbulence effect, because body is a straight tube, many, the bad arrangements of required number of tubes, take up room greatly, the two ends at straight tube during installation all need welded flange, and installation cost is high, and easy inefficacy.Though and spiral-groover U-shaped flat tube good effect of heat exchange and single face are installed, and have solved the problems referred to above, also there is the screw thread distortion in its minor axis place, and stress is very concentrated, influences service life; In addition; The manufacturing process of spiral-groover U-shaped flat tube is for forming earlier thread groove on the pipe of welding fabrication; And then it is pressed into the flat tube shape; Bend to the U type at last, this weldering earlier, back press, the curved manufacturing process weld easy of crack in use that makes spiral-groover U-shaped flat tube again, and service life is short.

Disclose among CN 101701779 A a kind of " multi-row pit heat exchange tube ", comprised the stainless steel body, be axially arranged with multi-row pit in the stainless steel tube surface along it, two adjacent row's groove position interlace.Under equal caliber condition, the making degree of depth of pit wants dark than the making degree of depth of the thread groove on thread groove flat tube or the U type flat tube on this heat exchanger tube, the heat exchange better effects if; But distribution and the making degree of depth of pit on body cambered surface inwall still can be restricted; Its reason is pit to be set can cause stress to concentrate equally on the cambered surface inwall, influences the service life of body, especially for flat tube and U-shaped flat tube; The pairing cambered surface radius of its minor axis is less, more is inappropriate for pit is set.

Summary of the invention

The utility model technical problem to be solved provides that a kind of heat exchange property is strong, the protruding formula U type of the thorn flat tube of long service life.

The technical scheme of the utility model is: this stings protruding formula U type flat tube; Comprise body, the body cross section is a flat, and the longitudinal section is the U type; Its special character is: face that relative thorn is protruding to be staggered directly for two; The pairing cambered surface of the minor axis of body is a smooth surface, and the protruding height of said thorn is e with the ratio of body minor axis length, 1/6≤e＜1.

Same to face adjacent two protruding spacings of thorn directly be s, s >=3.5mm.

Said longitudinal section is the cross section along the body long axis direction.

Said longitudinal section is the cross section along the body short-axis direction.

The invention has the beneficial effects as follows:

1, heat exchange property is strong.Because it is protruding that inboard wall of tube body is provided with thorn, the heat exchange area of body increases, and staggered thorn is protruding makes the gas through heat exchanger tube that turbulent phenomenon take place fully, increases substantially the coefficient of heat transfer, strengthens the heat exchange effect.

2, since face directly be provided with on the inwall thorn protruding; Reduce stress concentration degree greatly; So the making degree of depth of the groove on this heat exchanger tube on the protruding comparable thread groove flat tube of the making degree of depth (highly) of thorn is darker, be that the flat tube of 3.7 * 10.5mm is an example with minor axis dimension * major axis dimension, thread groove is 0.8mm the most deeply; Sting the protruding degree of depth and can reach 1.8mm, heat exchange efficiency can improve 20%.

3, because the pairing cambered surface of minor axis of body is a smooth surface; No thread groove or sting has protrudingly reduced stress and has concentrated, in the heat exchanger of temperature checker; The corresponding cambered surface of smooth minor axis has good thermal stress release performance, has effectively prolonged the service life of flat tube.

4, because manufacturing process adopts the mode that forging thorn earlier is protruding and typing is curled, weld the back,, prolonged service life so weld seam is not easy to crack.

Description of drawings

Fig. 1 is structural representation of the present invention (corresponding embodiment 1);

Fig. 2 is along the cutaway view of A-A among Fig. 1;

Fig. 3 is along the cutaway view of B-B among Fig. 1;

Fig. 4 is the protruding viewgraph of cross-section (corresponding embodiment 2) of thorn;

Fig. 5 is the structural representation (corresponding embodiment 2) of thorn convex edge axially-aligned;

Fig. 6 is structural representation of the present invention (corresponding embodiment 3).

Among the figure: body 1, face 101 directly, cambered surface 102, thorn protruding 2.

The specific embodiment

Embodiment 1:

Like Fig. 1-shown in Figure 3, this stings protruding formula heat exchanger tube, and the cross section of body 1 is the flat of height greater than width, and the longitudinal section is the cross section along body 1 short-axis direction, is the U type.Pairing two of the major axis of body 1 is faced 101 inwalls directly axially evenly to be provided with a plurality of thorns along body 1 protruding 2, and each is faced 101 inwalls directly and is respectively equipped with row's multiple row and stings protrudingly 2 in the present embodiment, stings protruding 2 and is Long Circle.The ratio that stings protruding 2 height h and the minor axis length d of stainless steel body 1 is e, 1/6≤e＜1, and the spacing of two said thorns protruding 2 that homonymy is adjacent is s, s>=3.5mm, e=1:6 in the present embodiment, s=3.5mm.Two face two relative and adjacent on 101 thorns protruding 2 directly is staggered, and the pairing cambered surface 102 of the minor axis of body 1 is a smooth surface.

Its manufacturing process comprises the steps:

1, the body stock area required according to single heat exchanger tube, the fixed a plurality of heat exchanger tube body stocks position of amount on stainless steel sheet strip forms two of flat tube surely in advance in each body stock position quantity then and faces 101 and two cambered surface 102 positions directly;

2, face directly to forge respectively on 101 positions two of each body stock and form a plurality of thorns protruding 2; The same thorn of facing directly on 101 protruding 2 is row's multiple row and distributes; Face protruding 2 interlaced arrangement of thorn relative on 101 directly for two; Stinging protruding 2 height meets the following conditions: the ratio that stings protruding 2 height h and preformed body minor axis length d is e, e=1/6;

3, be divided into a plurality of body stocks on the stainless steel sheet strip single;

4, typing is curled, and it is oblong flat tube that single body stock is curled into cross section;

5, welding pipe seam, the heat exchanger tube of formation flat tube shape;

6, the heat exchanger tube with the flat tube shape bends to the U type, forms the heat exchanger tube of U type flat tube shape.

Embodiment 2:

Like Fig. 4, shown in Figure 5, this stings protruding formula flat tube, stings half the greater than minor axis length d of protruding 2 height h, less than minor axis length d, i.e. and 1/2＜e＜1, the same distance s＞3.5mm that faces two adjacent on 101 thorns protruding 2 directly.Other are with embodiment 1.

Embodiment 3:

As shown in Figure 6, this U type flat tube comprises a stainless steel body 1, and the cross section of body 1 is the flat of width greater than height, and the longitudinal section is the cross section along body 1 long axis direction, is the U type.Other are with embodiment 1.

Claims (4)

1. one kind is stung protruding formula U type flat tube; Comprise body, the body cross section is a flat, and the longitudinal section is the U type; It is characterized in that: face that relative thorn is protruding to be staggered directly for two; The pairing cambered surface of the minor axis of body is a smooth surface, and the protruding height of said thorn is e with the ratio of body minor axis length, 1/6≤e＜1.

2. the protruding formula U type of thorn according to claim 1 flat tube is characterized in that: same to face adjacent two protruding spacings of thorn directly be s, s >=3.5mm.

3. the protruding formula U type of thorn according to claim 1 flat tube is characterized in that: said longitudinal section is the cross section along the body long axis direction.

4. the protruding formula U type of thorn according to claim 1 flat tube is characterized in that: said longitudinal section is the cross section along the body short-axis direction.

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