CN202547467U - Low-resistance reinforced heat exchanging tube - Google Patents
Low-resistance reinforced heat exchanging tube Download PDFInfo
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- CN202547467U CN202547467U CN201220203261XU CN201220203261U CN202547467U CN 202547467 U CN202547467 U CN 202547467U CN 201220203261X U CN201220203261X U CN 201220203261XU CN 201220203261 U CN201220203261 U CN 201220203261U CN 202547467 U CN202547467 U CN 202547467U
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Abstract
The utility model provides a low-resistance reinforced heat exchanging tube. The low-resistance reinforced heat exchanging tube comprises a spiral rib section and a smooth section, which are alternately arranged in sequence, wherein the tube inner wall of the spiral rib section is at least one preset length L1 long; the tube inner wall of the smooth section is at least one preset length L2 long; the maximum internal diameter D2 of the spiral rib section is as same as the internal diameter D of the smooth section; the ratio L1/L2 between the length L1 of the spiral rib section and the length L2 of the smooth section is 0.25-4; the low-resistance reinforced heat exchanging tube provided by the utility model not only has a reinforced heat transfer effect of a spiral internal rib tube but also can be used for reducing friction resistance of a fluid in the tube, reducing pump waste work for driving fluid circulation, keeping heat transfer deterioration delaying and preventing abilities and obtaining minimal flowing resistance; when being used in a boiler water cooling wall, the low-resistance reinforced heat exchanging tube provided by the utility model can be used for sufficiently showing a natural circulating characteristic of the flowing medium in the tube and is used for reducing hydraulic deviation between the tubes when heat exchanging efficiency is guaranteed; and if being used in a high temperature heat exchanger, the low-resistance reinforced heat exchanging tube provided by the utility model can be used for effectively enhancing heat transfer between the fluid and the high temperature tube wall, reducing tube wall temperature, improving heat exchanging ability and effectively reducing flowing resistance in the heat exchanger, so that equipment is safer, more economic and more efficient in operation.
Description
Technical field
The utility model belongs to the enhanced heat exchange technical field, is specifically related to a kind of low-resistance thermoexcell.
Background technology
Intensified heat transfer method mainly contains and in pipe, inserts distortion band, blender in the existing pipe; Or adopt machinery, physics, chemical method to increase the pipe internal surface roughness, or insert taenidium or adopt machining process to form whole special-shaped internally finned tube etc. at pipe inner close fitting tube wall.
The normal forms such as fin, groove rib that adopt increase the intraductal heat transfer area in the existing heat transmission equipment, come enhanced heat exchange with this; The heat transfer property of these thermoexcells is good, and heat transfer coefficient is higher 3～5 times than light pipe, and the critical heat flux density that heat transfer deterioration takes place is high than light pipe.Heat flow density and steam quality when the cyclonic action of fluid can improve the heat transfer deterioration generation effectively in the thermoexcell (like riffled tube) of band helical structure; Than light pipe; Can heat transfer deterioration be postponed till higher mass dryness fraction district, and the highest wall temperature when heat transfer deterioration takes place is also far below light pipe.In such as evaporating heating surfaces such as boiler water walls, adopt the riffled tube of a definite form under mass velocity more much lower than light pipe and much higher steam quality condition, to keep nucleate boiling, female thread structure can effectively suppress or postpone film boiling.But riffled tube also makes the flow resistance of fluid in pipe increase greatly in augmentation of heat transfer.The undue increase fluid recirculation of flow resistance is very unfavorable, and the feed pump power consumption of the circulatory system is greatly increased.
Reasonably utilize augmentation of heat transfer technology,, should make main flow partly produce less resistance loss simultaneously as far as possible, to reduce unnecessary pump merit consumption through increasing heat exchange area, in the boundary layer, producing the purpose that measure such as stirrings can realize reducing heat transfer resistance.For this reason, develop a kind of heat transfer property height and the little novel reinforced heat exchange cast of flow resistance is very necessary.
The utility model content
For solving the above-mentioned defective that exists in the prior art, the purpose of the utility model is to provide a kind of low-resistance thermoexcell, when guaranteeing good heat transfer property, can reduce the flow resistance of medium in pipe effectively.
For achieving the above object, the technical scheme that the utility model adopted is:
A kind of low-resistance thermoexcell is that the spiral ribs section 1 of at least one preset length L1 and the smooth section 2 alternating sequences arrangement of at least one preset length L2 constitute by inside pipe wall.
The maximum inner diameter D2 of said spiral ribs section 1 is identical with the inside diameter D of smooth section 2;
The ratio of the length L 1 of said spiral ribs section 1 and the length L 2 of smooth section 2 is: L1/L2=0.25～4.
The number of starts of the spiral ribs 3 of said spiral ribs section 1 is 3～6.
The width B of the spiral ribs 3 of said spiral ribs section 1=(0.05～0.3) * D2, height H=(0.08 ~ 0.2) * D2.
The height H of a plurality of spiral ribs 3 of said spiral ribs section 1 is identical or different.
The width B of a plurality of spiral ribs 3 of said spiral ribs section 1 is identical or different.
The shape of cross section of the spiral ribs 3 of said spiral ribs section 1 is triangle, quadrangle or trapezoidal.
The lift angle of the spiral ribs 3 of said spiral ribs section 1 is 15～90 degree.
Compared with prior art, the utlity model has following advantage:
The low-resistance thermoexcell of the utility model; Be designed with spiral ribs section and smooth section with certain optimization proportioning, utilize helical structure the increase heat exchange area, force fluid rotation and flow-disturbing effect, destroy flowing and thermal boundary layer of near wall region in the pipe; Also promptly utilize the method for manual method additional turbulence; Make generation strong disturbance in the flow boundary layer and reduce thermal resistance, increase heat output, reach the purpose of augmentation of heat transfer; Simultaneously, flow working medium was able to keep in smooth section and continuity in the force turning effort that produces under the effect and the high heat-exchanging performance that causes thus of spiral ribs structure; Do not have extra perturbations in the smooth section, flow resistance reduces; Meanwhile, through the spiral ribs section that the fluid after the smooth section gets into downstream once more, so the compartment of terrain gets into spiral ribs section and smooth section, makes full use of the entry-end effect of spiral ribs section and smooth section, strengthens heat exchange effectively.Thereby this cast had both had the augmentation of heat transfer effect of internally finned tube, can reduce the frictional resistance of tube fluid again, reduced the power consumption of feed pump; Can keep postponing and preventing the performance of heat transfer deterioration, have alap flow resistance again; As in boiler water wall, using, can make the natural circulation characteristic (self compensation characteristic) of flow media in the pipe be able to manifest fully, when guaranteeing heat exchange efficiency, reduce hydraulic deviation between pipe; As in other high-temperature heat-exchanging, using, the effectively heat transfer between enhance fluid and high temperature tube wall reduces the tube wall temperature level, has both improved exchange capability of heat, can effectively reduce flow resistance in the heat exchanger again, makes safer, economic, the operation efficiently of equipment.
Description of drawings
Fig. 1 is the structural representation of the utility model low-resistance thermoexcell.
Fig. 2 is the radial section sketch map of the utility model low-resistance thermoexcell spiral ribs section L1.
The schematic cross-section of Fig. 3 (a) when being three for the number of starts of the utility model low-resistance thermoexcell spiral ribs section; The schematic cross-section of Fig. 3 (b) when being four-head for the number of starts of the utility model low-resistance thermoexcell spiral ribs section; The schematic cross-section of Fig. 3 (c) when being five for the number of starts of the utility model low-resistance thermoexcell spiral ribs section; The schematic cross-section of Fig. 3 (d) when being six for the number of starts of the utility model low-resistance thermoexcell spiral ribs section.
Fig. 4 (a) is the sketch map that the utility model low-resistance thermoexcell spiral ribs section L1 adopts the triangle spiral ribs; Fig. 4 (b) is the sketch map that the utility model low-resistance thermoexcell spiral ribs section L1 adopts the quadrangle spiral ribs; Fig. 4 (c) is the sketch map that the utility model low-resistance thermoexcell spiral ribs section L1 adopts the trapezoid spiral rib; Fig. 4 (d) is the sketch map that the utility model low-resistance thermoexcell spiral ribs section L1 adopts the screw thread rib that the rib height do not wait.
Fig. 5 is the comparison diagram of the utility model embodiment 1 and prior art exchange performance curve and drag characteristic curve.
Fig. 6 is the utility model embodiment 2 and prior art exchange performance curve and drag characteristic curve comparison diagram.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is done further explain.
As shown in Figure 1, a kind of low-resistance thermoexcell of the utility model is that the spiral ribs section 1 of at least one preset length L1 and the smooth section 2 alternating sequences arrangement of at least one preset length L2 constitute by inside pipe wall.
As shown in Figure 2, the maximum inner diameter D2 of said spiral ribs section 1 is identical with the inside diameter D of smooth section 2, and such structure makes spiral ribs become convexity; Disturbance near wall region fluid; Destroy the boundary layer effectively, promote the exchange of nearly wall fluid and main flow, thereby play the effect of enhanced heat exchange.
Preferably; The ratio of the length L 1 of spiral ribs section 1 and the length L 2 of smooth section 2 is: L1/L2=0.25～4; Make full use of the fluid rotation disturbance effect that forms in the spiral ribs section of the upper reaches, increase the lateral flow speed of tube fluid, promote cold and hot fluid mixing and and tube wall between heat exchange; Smooth section is further utilized established fluid rotation and perturbation action in the spiral ribs section of the upper reaches, utilizes the high characteristics of entry-end effect district tube internal heat exchange coefficient simultaneously, makes whole heat exchanger tube obtain the higher coefficient of heat transfer.Consider that the spiral ribs section forces the effect of fluid rotation inconsistent under different inlet flow velocitys, flow in the smooth section of downstream to reach again and stablize required segment length and also change thereupon.Test result shows that when the inlet Reynolds number was low, the ratio of L1 and L2 should be got the value smaller or equal to 1.0; And when the inlet Reynolds number was higher, the fluid spinning momentum in the spiral ribs section strengthened, and the ratio of L1 and L2 should be got the value greater than 1.0; For example, when Reynolds number was 5000, intraductal heat transfer and mobile performance were more excellent during L1/L2=1.0; When Reynolds number was 25000, it is 2.0 preferable that L1/L2 is taken as.
Preferably; The width B of the spiral ribs 3 of spiral ribs section 1=(0.05～0.3) * D2; Height H=(0.08 ~ 0.2) * D2, this rib structure size can keep higher rib area, enhanced heat exchange; Simultaneously can guarantee that again fluid forms higher spinning momentum in spiral ribs section 1, and in the smooth section 2 in downstream, keep stronger eddy flow and disturbance effect.
As shown in Figure 3, the number of starts of the spiral ribs 3 of spiral ribs section 1 is 3～6, and the suitable increase of number of starts helps near the fluid territory the wall is divided into multi beam, is beneficial to the destruction to flow boundary layer, and obtains bigger rib area.The schematic cross-section of Fig. 3 (a) when being three wherein for the number of starts of thermoexcell spiral ribs section; The schematic cross-section of Fig. 3 (b) when being four-head for the number of starts of thermoexcell spiral ribs section; The schematic cross-section of Fig. 3 (c) when being five for the number of starts of thermoexcell spiral ribs section; The schematic cross-section of Fig. 3 (d) when being six for the number of starts of thermoexcell spiral ribs section.
As shown in Figure 4; The height H of a plurality of spiral ribs 3 of said spiral ribs section 1 can be identical or different; The width B of a plurality of spiral ribs 3 of said spiral ribs section 1 can be identical or different, and the shape of cross section of the spiral ribs 3 of said spiral ribs section 1 can be triangle, quadrangle, trapezoidal or trapezoidal.
Preferably, the lift angle of the spiral ribs 3 of spiral ribs section 1 is 15～90 degree, and lead angle is big more, and the helical pitch of corresponding spiral ribs is big more; Lead angle is more little, and the helical pitch of its spiral ribs is more little.Test result shows: under the low flow velocity, the tubular construction with less lead angle helps managing interior enhanced heat exchange; Otherwise high flow rate is next.
Embodiment 1
The total pipe range of present embodiment is taken as 261mm, and the spiral ribs segment length L1 that gets in the unit pipeline section is a helical pitch long (wherein helical pitch is 87mm), and smooth section length L 2 is 43.5mm (L1/L2=2.0); The number of starts of spiral ribs section is a four-head, and external diameter of pipe is 22mm, and maximum inner diameter is 14.1mm, and minimum diameter is 12.3mm, and the width of thread is 4.0mm, and thread depth 0.85mm, lead angle are 54 degree; Reynolds number is taken as 5346 in the pipe, and the outer wall thermic load is 50kW/m
2, exchange heat pipe with this understanding and heat.The heat exchange property curve and the drag characteristic curve of the novel heat exchange pipe of this embodiment are as shown in Figure 5.Can be found out by curve among Fig. 5: the coefficient of heat transfer of this novel pipe is high slightly in smooth section; The whole coefficient of heat transfer of this novel pipe and the ratio of the light pipe coefficient of heat transfer are with increase value of tending towards stability (being about 3.2) of pipe range, a little less than the ratio (being about 3.5) of the coefficient of heat transfer between screwed pipe and the light pipe; The resistance coefficient ratio of the resistance coefficient of this novel pipe and light pipe is 1.09, is lower than the ratio 1.22 of screwed pipe and light pipe resistance coefficient.
Embodiment 2
Be the influence to flowing with heat exchange property of the structure of describing the utility model low-resistance thermoexcell better, the cast length ratio of present embodiment changes to some extent.The length L 1 that present embodiment is chosen the spiral ribs section and the ratio of the length L 2 of smooth section are 1.0 (in Fig. 6, representing the novel pipe of present embodiment 2 with novel pipe 2, to be different from the novel pipe 1 among the embodiment 1).Total pipe range of novel pipe 2 is taken as 261mm, and the length L 1 of the spiral ribs section in every unit pipeline section is 43.5mm, and the length L 2 of smooth section is 43.5mm (L1/L2=1.0); Other parameter is identical with the data of embodiment 1.The heat exchange property curve and the drag characteristic curve of novel pipe 2 are as shown in Figure 6.Curve map by Fig. 6 can be found out: when the length ratio of the length of spiral ribs section and smooth section is 1.0 (novel pipe 2); The heat exchange property of smooth section obviously increases in the novel pipe; Be up to 5.46 times of the light pipe coefficient of heat transfer; The coefficient of heat transfer of band spiral ribs section is a little more than screwed pipe, and the whole heat exchange property of novel pipe 2 improves; The resistance coefficient ratio of the resistance coefficient of novel pipe 2 and light pipe is 1.15, is lower than the ratio 1.22 of screwed pipe and light pipe resistance coefficient.
Claims (9)
1. a low-resistance thermoexcell is characterized in that: be the spiral ribs section (1) of at least one preset length L1 and smooth section (2) the alternating sequence arrangement formation of at least one preset length L2 by inside pipe wall.
2. low-resistance thermoexcell according to claim 1 is characterized in that: the maximum inner diameter D2 of said spiral ribs section (1) is identical with the inside diameter D of smooth section (2)
3. low-resistance thermoexcell according to claim 1 is characterized in that: the ratio of the length L 2 of the length L 1 of said spiral ribs section (1) and smooth section (2) is: L1/L2=0.25～4.
4. according to claim 2 or 3 described low-resistance thermoexcells, it is characterized in that: the number of starts of the spiral ribs (3) of said spiral ribs section (1) is 3～6.
5. low-resistance thermoexcell according to claim 2 is characterized in that: width B=(0.05～the 0.3) * D2 of the spiral ribs (3) of said spiral ribs section (1), height H=(0.08 ~ 0.2) * D2.
6. low-resistance thermoexcell according to claim 5 is characterized in that: the height H of a plurality of spiral ribs (3) of said spiral ribs section (1) is identical or different.
7. low-resistance thermoexcell according to claim 5 is characterized in that: the width B of a plurality of spiral ribs (3) of said spiral ribs section (1) is identical or different.
8. according to claim 2 or 3 described low-resistance thermoexcells, it is characterized in that: the shape of cross section of the spiral ribs (3) of said spiral ribs section (1) is triangle, quadrangle or trapezoidal.
9. according to claim 2 or 3 described low-resistance thermoexcells, it is characterized in that: the lift angle of the spiral ribs (3) of said spiral ribs section (1) is 15～90 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220203261XU CN202547467U (en) | 2012-05-08 | 2012-05-08 | Low-resistance reinforced heat exchanging tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220203261XU CN202547467U (en) | 2012-05-08 | 2012-05-08 | Low-resistance reinforced heat exchanging tube |
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| Publication Number | Publication Date |
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| CN202547467U true CN202547467U (en) | 2012-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220203261XU Expired - Lifetime CN202547467U (en) | 2012-05-08 | 2012-05-08 | Low-resistance reinforced heat exchanging tube |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102679788A (en) * | 2012-05-08 | 2012-09-19 | 西安交通大学 | Novel reinforcing heat exchange pipe |
| CN104154794A (en) * | 2013-12-06 | 2014-11-19 | 北京大学工学院包头研究院 | Heat exchange tube and heat exchanger with heat exchange tube |
| CN104976766A (en) * | 2014-11-21 | 2015-10-14 | 林永勤 | Round copper water pipe combusted and heated through water heater and manufacturing method of round copper water pipe |
-
2012
- 2012-05-08 CN CN201220203261XU patent/CN202547467U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102679788A (en) * | 2012-05-08 | 2012-09-19 | 西安交通大学 | Novel reinforcing heat exchange pipe |
| CN104154794A (en) * | 2013-12-06 | 2014-11-19 | 北京大学工学院包头研究院 | Heat exchange tube and heat exchanger with heat exchange tube |
| CN104154794B (en) * | 2013-12-06 | 2017-07-21 | 北京大学工学院包头研究院 | A kind of method of heat exchange efficiency of the raising gas-liquid two-phase state CO2 working medium in heat exchanger tube |
| CN104976766A (en) * | 2014-11-21 | 2015-10-14 | 林永勤 | Round copper water pipe combusted and heated through water heater and manufacturing method of round copper water pipe |
| CN104976766B (en) * | 2014-11-21 | 2017-08-25 | 六安同辉智能科技有限公司 | The circular copper plumbing and its manufacture method of a kind of water heater combustion heating |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121121 |