CN2893620Y - Spiral notch heat exchange tube - Google Patents
Spiral notch heat exchange tube Download PDFInfo
- Publication number
- CN2893620Y CN2893620Y CN 200620004135 CN200620004135U CN2893620Y CN 2893620 Y CN2893620 Y CN 2893620Y CN 200620004135 CN200620004135 CN 200620004135 CN 200620004135 U CN200620004135 U CN 200620004135U CN 2893620 Y CN2893620 Y CN 2893620Y
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- Prior art keywords
- helical groove
- heat exchange
- exchange tube
- cross sectional
- sectional shape
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Abstract
The utility model relates to a heat-exchanging pipe with helix grooves, comprising a stainless-steel pipe of the helix groove whose surface protrudes inner-forward. Wherein, the height and width of sections of stainless-steel pipe are different. In the exhausted-gas circulation system of automobile engine, the heat-exchanging pipe which is used as the condenser and has the helix grooves bearing sections with different heights and widths can make the condenser get a high heat-exchanging capability, and simultaneously the dust is not easy to be accumulated in and out the pipe so the emission-capability index of automobile engine is largely enhanced to meet a higher environment-friendly emission requirement.
Description
Technical field
The utility model relates to a kind of helical groove heat exchange tube, especially a kind ofly is applied to helical groove heat exchange tube in the vehicle engine exhaust gas recirculated cooling system, that have the unequal cross sectional shape of height and the width.
Background technology
Waste gas recirculation cooling technology is a technology that effectively, reliably reduces Diesel engine oxynitrides discharge capacity, its operation principle is: after by cooler the EGT of discharging being reduced, pass back in the combustion chamber of engine, reduce the temperature of combustion chamber, thereby reduce the generation and the discharging of oxynitrides.Wherein, cooler is the key element in the gas recirculation system, and the height of its heat exchange efficiency has determined the temperature height of EGR gas, therefore, how improving the heat exchange efficiency of cooler for recycled exhaust gas under the prerequisite that keeps economy, is a primary technical indicator of design cooler.And heat exchanger tube is the critical component in the cooler, and the height of the coefficient of heat transfer of heat exchanger tube has determined the heat exchange efficiency of cooler to a great extent, so need constantly to improve as much as possible the coefficient of heat transfer of heat exchanger tube.
At present, the heat exchanger tube that uses in a large number in the engine exhaust recycle cooler all is to adopt a kind of surface to have the stainless steel tube of the cross section of inwardly protruding helical groove as circle.But, along with the requirement of environmental regulation to motor vehicle exhaust emission improves day by day, this cross sectional shape can not satisfy the following requirement that will be dozens or even hundreds of times increase to the generation and the discharging quantitative limitation of automobile oxynitrides for the heat exchange effect of circular helical groove heat exchange tube, for the more and more strict at present emission request and the economic market of keen competition, in the engine exhaust recirculated cooling system of limited installing space, it is unable to do what one wishes that the helical groove heat exchange tube of circular section shape has seemed.
The utility model content
The purpose of this utility model is can not satisfy on heat exchanger effectiveness at the helical groove heat exchange tube of above-mentioned existing circular section shape the present situation of following environmental protection demand, and design a kind of heat exchanger tube with higher heat exchange efficiency, this heat exchanger tube can improve heat exchanger effectiveness greatly under the state of cooler constancy of volume.
For achieving the above object, the utility model provides a kind of helical groove heat exchange tube, comprises that the surface has the stainless steel body of inwardly protruded helical groove, and wherein, the height and the width of the cross sectional shape of described stainless steel body are unequal.
In the such scheme, the cross sectional shape of described stainless steel body can be rectangle, and connects for arc-shaped transition between the adjacent both sides; The cross sectional shape of described stainless steel body also can be made of two relative minor faces long limit relative with two, and wherein, described minor face is the camber line that protrudes from inside to outside, and described long limit can be straight line, also can be the camber line that protrudes from inside to outside; The cross sectional shape of described stainless steel body can also be ellipse.Certainly for better description, the above-mentioned cross sectional shape of described stainless steel body is that not have the standard shape that presents under the situation of helical groove, the cross sectional shape of the heat exchanger tube in the utility model in hypothesis be the combination of the cross sectional shape of the above-mentioned cross sectional shape of described stainless steel body and described helical groove.Described helical groove can be set to many, and every helical groove all can be for being provided with or interrupted the setting continuously; The cross sectional shape of helical groove can be set to " U " shape or " V " shape, is beneficial to the generation of small size shape face; Groove lead angle β is designed between 20～75 degree; Depth of groove D is not less than 0.4mm, can make fluid produce turbulent flow fully in pipe; Simultaneously,, simplify difficulty of processing,, make all surface all can carry out heat exchange fully well, thoroughly eliminated the heat exchange dead angle so all acute angles of cross section all are designed to the circular arc R transition in order to ensure economical and practical.
When waste gas passes through this heat exchanger tube, can stream the spiral salient position, the local wall boundary layer separation takes place, form vortex in the spiral salient back, this boundary layer separation is strengthened with feasible heat transfer of generation vortex.And it is for the helical movement that spiral salient can cause waste gas, cause producing in the waste gas complicated secondary vortex flow (being also referred to as secondary stream), increased the turbulivity of waste gas, especially increased disturbance the near wall region boundary layer, promote the blending of boundary layer and core space fluid, made thermal convection current strengthen; Secondary stream also has the cross section of making VELOCITY DISTRIBUTION and is tending towards effect of uniform, the design of four kinds of these class flat cross section such as especially above-mentioned rectangle, ellipse, make the synergy of the centrifugal force that secondary stream and rotatablely moving produces allow the thickness attenuate greatly in boundary layer, critical Reynolds number is reduced, promptly take place ahead of time from the transformation of laminar flow to turbulent flow, strong turbulent flow makes dirt suffer fierce erosion in pipe, therefore, the spiral heat exchange tube of four kinds of these class flattened such as above-mentioned rectangle, ellipse is difficult to fouling, is more conducive to the heat conduction.
In addition, we also compare through experiment the heat exchange effect of the helical groove pipe of the helical groove heat exchange tube of the long-pending circular section shape of same cross-sectional and above-mentioned flattened, see accompanying drawing 1 and Fig. 2 for details.A, B are the coefficient of heat transfer of helical groove heat exchange tube of flattened and the relation curve of heat exchanger tube area of section among the figure; A ', B ' are the coefficient of heat transfer of helical groove heat exchange tube of flattened and the relation curve of flow velocity; C, C ' are respectively the graph of relation of the coefficient of heat transfer of helical groove heat exchange tube of circular section shape and heat exchanger tube area of section, flow velocity.
As seen from Figure 1: under the identical cross-sectional flow area, the helical groove heat exchange tube coefficient of heat transfer of the relative circular section shape of the coefficient of heat transfer of the helical groove heat exchange tube of flattened improves a lot.
As seen from Figure 2: with the increase of flow velocity, the helical groove heat exchange tube coefficient of heat transfer of flattened increases very fast, and the coefficient of heat transfer of the helical groove heat exchange tube of circular section shape comparatively fast tended to be steady to a certain period.
Therefore, as can be seen, the cooler that utilizes the utility model to make can obtain bigger cooling effect under equal volume size, improve the discharge performance index of automobile engine greatly, satisfies higher environment protection emission requirement.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is the coefficient of heat transfer of helical groove heat exchange tube of the helical groove heat exchange tube of the utility model flattened and circular section shape and the experimental result comparison diagram of area of section relation;
Fig. 2 is the coefficient of heat transfer of helical groove heat exchange tube of the helical groove heat exchange tube of the utility model flattened and circular section shape and the experimental result comparison diagram of flow velocity relation;
Fig. 3 is the utility model first embodiment perspective view;
Fig. 4 is the cross sectional shape schematic diagram of first embodiment shown in Figure 3;
Fig. 5 is the perspective view of the utility model second embodiment;
Fig. 6 is the cross sectional shape schematic diagram of second embodiment shown in Figure 5;
Fig. 7 is the perspective view of the utility model the 3rd embodiment;
Fig. 8 is the cross sectional shape schematic diagram of the 3rd embodiment shown in Figure 7;
Fig. 9 is the perspective view of the utility model the 4th embodiment;
Figure 10 is the cross sectional shape schematic diagram of the 4th embodiment shown in Figure 9.
The specific embodiment
Be respectively perspective view and the cross sectional shape schematic diagram of the utility model first embodiment shown in Fig. 3,4.Among the figure, heat exchanger tube is the stainless steel body 2 that the surface has an inwardly protruded helical groove 21.Realize the heat exchange of maximal efficiency for the surface that makes full use of heat exchanger tube, and be easy to production and processing, the circular arc transition that is set to radius between present embodiment the two sides that heat exchanger tube is adjacent and is R connects, the cross sectional shape of helical groove is removed in this heat exchanger tube cross section, the cross sectional shape of stainless steel body 2 is rectangle, and for arc-shaped transition connects, as shown in Figure 4, wherein a is a depth of section between the adjacent two sides; This spiral salient can be one or more; The cross sectional shape of helical groove can be set to " U " shape or " V " shape, is beneficial to the generation of small size shape face; The groove lead angle is designed between 20～75 degree; Depth of groove is not less than 0.4mm.
Be respectively perspective view and the cross sectional shape schematic diagram of the utility model second embodiment shown in Fig. 5,6.Two relative minor faces that present embodiment and the difference of above-mentioned first embodiment are stainless steel body 2 for curved projection from inside to outside, radius is the arc surface of R1, as shown in Figure 6; Remainder is identical with embodiment one.Production and processing is convenient in such setting, and does not reduce heat exchange efficiency.
Be respectively perspective view and the cross sectional shape schematic diagram of the utility model the 3rd embodiment shown in Fig. 7,8.In order to guarantee product quality, present embodiment also is set to be the camber line that protrudes from inside to outside with two of stainless steel tube 2 relative long limits on the basis of embodiment two, and the arc surface of curved projection from inside to outside all is arranged on four surfaces that are about to stainless steel tube 2; And as shown in Figure 8, the arc radius R ' on long limit is far longer than the radius R of minor face, the phenomenon that the surface " subsides " can not occur like this; Remainder is identical with embodiment one.
Fig. 9,10 is depicted as perspective view and the cross sectional shape schematic diagram of the utility model the 4th embodiment.Present embodiment is an equivalent deformation on the basis of above-mentioned the 3rd embodiment cross sectional shape, and promptly under the situation of the cross sectional shape of removing helical groove, the cross sectional shape of stainless steel body 2 is an ellipse; Remainder is identical with embodiment one.
Utilize cooler that the utility model makes under equal volume size, obtained bigger cooling effect, improved the discharge performance index of automobile engine greatly, satisfied higher environment protection emission requirement.
It should be noted last that, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not break away from the spirit and scope of technical solutions of the utility model.
Claims (9)
1, a kind of helical groove heat exchange tube comprises that the surface has the stainless steel body of inwardly protruded helical groove, and it is characterized in that: the height and the width of the cross sectional shape of described stainless steel body are unequal.
2, helical groove heat exchange tube according to claim 1 is characterized in that: the cross sectional shape of described stainless steel body is a rectangle, and connects for arc-shaped transition between the adjacent both sides.
3, helical groove heat exchange tube according to claim 1 and 2, it is characterized in that: the cross sectional shape of described stainless steel body is made of two relative minor faces long limit relative with two, wherein, described minor face is the camber line that protrudes from inside to outside, and described long limit is a straight line.
4, helical groove heat exchange tube according to claim 3 is characterized in that: described two relative long limits are the camber line that protrudes from inside to outside.
5, helical groove heat exchange tube according to claim 1 is characterized in that: the cross sectional shape of described stainless steel body is for oval.
6, according to claim 1,2,4 or 5 described helical groove heat exchange tubes, it is characterized in that: described helical groove is one or more.
7, helical groove heat exchange tube according to claim 6 is characterized in that: described one or more helical groove is for being provided with continuously or interrupted the setting.
8, according to claim 1,2,4 or 5 described helical groove heat exchange tubes, it is characterized in that: the cross sectional shape of described helical groove is " U " shape or " V " shape.
9, helical groove heat exchange tube according to claim 8 is characterized in that: be connected for rounding off between the surface of described helical groove and described stainless steel body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620004135 CN2893620Y (en) | 2006-02-27 | 2006-02-27 | Spiral notch heat exchange tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620004135 CN2893620Y (en) | 2006-02-27 | 2006-02-27 | Spiral notch heat exchange tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2893620Y true CN2893620Y (en) | 2007-04-25 |
Family
ID=38061781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620004135 Expired - Lifetime CN2893620Y (en) | 2006-02-27 | 2006-02-27 | Spiral notch heat exchange tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2893620Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115014014A (en) * | 2022-07-01 | 2022-09-06 | 浙江壳邦力特油脂有限公司 | Cooling water circulation device for lubricating grease production |
-
2006
- 2006-02-27 CN CN 200620004135 patent/CN2893620Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115014014A (en) * | 2022-07-01 | 2022-09-06 | 浙江壳邦力特油脂有限公司 | Cooling water circulation device for lubricating grease production |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20070425 |
|
| EXPY | Termination of patent right or utility model |