CN1222671A - Machining technology of three-dimensional micro-rib pipe inside outer pipe - Google Patents
Machining technology of three-dimensional micro-rib pipe inside outer pipe Download PDFInfo
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- CN1222671A CN1222671A CN 98104620 CN98104620A CN1222671A CN 1222671 A CN1222671 A CN 1222671A CN 98104620 CN98104620 CN 98104620 CN 98104620 A CN98104620 A CN 98104620A CN 1222671 A CN1222671 A CN 1222671A
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Abstract
Micro-rib pipe is machined through the first step to machine longitudinal channels throughout the pipe in broacher and the second step to machine traverse channels perpendicular to longitudinal ones by using special multiple tapping unit. Unmachined parts between the channels form ladder-shaped inner ribs. The micro-rib pipe of the present invention has excellent heat exchange performance and resistance characteristic and is suitable for use as evaporator and condensator in various industrial equipment and refrigerating equipment.
Description
The invention belongs to augmentation of heat transfer and field of energy-saving technology, particularly a kind of processing technology of three-dimensional micro-rib pipe inside outer pipe.
In recent years, because the boiling and the condensation heat transfer coefficient height of three-dimensional little rib thermoexcell in the pipe, the characteristics that the increasing degree of flow resistance is little, caused the extensive attention of domestic and international relevant industries, and drop into human and material resources and research and develop, try hard to solve in the pipe three-dimensional little help pipe particularly three-dimensional in the process technology difficult problem of little rib seamless pipe.CN1037391A disclosed " three-dimensional internal-rib pipe and processing technology thereof " adopts gang tool on special purpose machine tool, various inner wall of metal tube is carved cut processing, forms and arranges the orderly pin rib or the three-dimensional internal-rib pipe of fish scale rib and groove.But,, can't process the less interior micro-rib pipe of interior micro-rib pipe, particularly caliber owing to be subjected to icking tool intensity and the quantitative limitation of the icking tool number of permutations.
The object of the present invention is to provide a kind of in broaching machine and special purpose machine tool use the dedicated tool machining 3 D process of micro-rib pipe.
The objective of the invention is the footpath and cross processing longitudinal groove earlier, cross machine groove two procedures realizes then.Processing longitudinal groove will be the seamless metal pipe clamping on broaching machine, on inner wall of metal tube, process longitudinal groove with special broaching tool, ditch groove depth 0.3～0.5mm, groove pitch 0.5～0.7mm; The cross machine groove be metal tube clamping with last operation on special purpose machine tool, ditch groove depth 0.3～0.5mm, groove pitch 0.5～0.7mm.Processing through above-mentioned two procedures forms crisscross groove at the inwall of metal tube, and the untouched part of blade becomes three-dimensional little rib, and the metal tube genus of completion of processing is three-dimensional micro-rib pipe inside outer pipe.Part become three-dimensional little rib, the metal tube of completion of processing belongs to and is three-dimensional micro-rib pipe inside outer pipe.Adopt the present invention and equipment thereof, cutter, can process the three-dimensional micro-rib pipe inside outer pipe of various metals, bore can be as small as 8mm, and pipe range can reach 5-6m.
Accompanying drawing 1 is the profile of the three-dimensional interior micro-rib pipe of the present invention's processing.
The invention solves the difficult problem of metal circular tube inwall deep hole machining, the equipment of required usefulness is easy to make, processing cost is low, reliability is high, easy and simple to handle, production is easy to realize semi-automation.The three-dimensional micro-rib pipe inside outer pipe that processes is managed on behalf of another interior two-dimentional thermoexcell with second of present generally use and is compared, and better heat exchange property and drag characteristic are arranged.Following table is the heat exchange property comparison sheet of three-dimensional ribbed pipe in insert in internally finned tube and the pipe, the interior two-dimentional micro-rib pipe of pipe, the pipe.
Table is annotated: the ratio of the 1.n/np enhanced tube coefficient of heat transfer and the light pipe coefficient of heat transfer;
| Enhanced tube | The heat exchange form | N/np (strengthening ratio) | Δ p/ Δ Pp (crushing ratio) | ????n |
| Insert in internally finned tube and the pipe | The evaporation and condense | ????＜2 | ?2～3.5 | ?1～0.57 |
| Two-dimentional micro-rib pipe in the pipe | Evaporation | 1.66～4.1?8 | ?1.5-1.9 | ?1.07～2.2 |
| Condense | 2.23～4.56 | ?1.2～1.5 | ?1.65～3.04 | |
| Three-dimensional micro-rib pipe inside outer pipe | Evaporation | 1.70～4.56 | ?1.5～1.68 | ?1.13～2.71 |
| Condense | 2.35～5.59 | ?1.42～1.66 | ?1.94～3.37 |
2. Δ p/ Δ Pp enhanced tube drag losses and light pipe drag losses ratio;
3.n=(n/np)/(Δ p/ Δ Pp) enhanced tube resultant effect index;
4. insert comprises that aluminium core and spiral turn round for insert etc. in the pipe;
5. data are different medium flow condition value corresponding in the table.
The three-dimensional micro-rib pipe inside outer pipe of the present invention's processing is applicable to the condenser/evaporator of evaporimeter, condenser and the Cryo Equipment of the equipment of industrial product and refrigeration air-conditioner, and be used for dry evaporator, vertical pipe type and helix tube type evaporimeter, heat transmission equipments such as water spray type condenser, evaporative condenser and condenser/evaporator, effect is the most remarkable.
Be 2m to add the section chief now, internal diameter is that three-dimensional little rib copper tube of 14mm is an example, and the invention will be further described.The first step is clipped in copper tube on the broaching machine, processes 62 road longitudinal grooves, ditch groove depth 0.3mm with special broaching tool on the copper tube inwall, and the ditch spacing is 0.7mm; Copper tube clamping after second step was processed preceding operation is on special purpose machine tool, on the copper tube inwall, process the lateral trench vertical with special bull screw tap with longitudinal groove, ditch groove depth 0.3mm, groove pitch is 0.7mm, promptly obtains little rib copper tube in the needed three-dimensional after the completion of processing.
Claims (3)
1. the processing technology of a three-dimensional micro-rib pipe inside outer pipe, it is characterized in that processing ditch depth earlier in metal pipe-wall is 0.3～0.5mm, the ditch spacing is 0.5～0.7mm longitudinal groove, and then processing is vertical with longitudinal groove, the degree of depth is 0.3～0.5mm, the ditch spacing is 0.5～0.7mm lateral trench, and unprocessed part forms little rib of trapezoidal shape.
2. the processing technology of a kind of three-dimensional micro-rib pipe inside outer pipe according to claim 1 is characterized in that processing longitudinal groove on broaching machine, adopts special broaching tool to shape.
3. the processing technology of a kind of three-dimensional micro-rib pipe inside outer pipe according to claim 1 is characterized in that the cross machine groove on special purpose machine tool, adopts special bull screw tap to shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98104620 CN1222671A (en) | 1998-01-07 | 1998-01-07 | Machining technology of three-dimensional micro-rib pipe inside outer pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98104620 CN1222671A (en) | 1998-01-07 | 1998-01-07 | Machining technology of three-dimensional micro-rib pipe inside outer pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1222671A true CN1222671A (en) | 1999-07-14 |
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ID=5218336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98104620 Pending CN1222671A (en) | 1998-01-07 | 1998-01-07 | Machining technology of three-dimensional micro-rib pipe inside outer pipe |
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| Country | Link |
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| CN (1) | CN1222671A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101963474A (en) * | 2010-09-15 | 2011-02-02 | 广州大学 | Plane three-dimensional boiling structure and processing method thereof |
| CN1898520B (en) * | 2003-10-23 | 2012-06-13 | 沃尔弗林管子公司 | Method and tool for making enhanced heat transfer surfaces |
| CN110174011A (en) * | 2019-04-19 | 2019-08-27 | 中国科学院合肥物质科学研究院 | Super evaporating heat exchanger |
| CN111050458A (en) * | 2019-12-09 | 2020-04-21 | 重庆大学 | Direct current arc cathode head with inner hole having micro-rib structure |
-
1998
- 1998-01-07 CN CN 98104620 patent/CN1222671A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1898520B (en) * | 2003-10-23 | 2012-06-13 | 沃尔弗林管子公司 | Method and tool for making enhanced heat transfer surfaces |
| CN101963474A (en) * | 2010-09-15 | 2011-02-02 | 广州大学 | Plane three-dimensional boiling structure and processing method thereof |
| CN101963474B (en) * | 2010-09-15 | 2013-04-24 | 广州大学 | Plane three-dimensional boiling structure and processing method thereof |
| CN110174011A (en) * | 2019-04-19 | 2019-08-27 | 中国科学院合肥物质科学研究院 | Super evaporating heat exchanger |
| CN110174011B (en) * | 2019-04-19 | 2021-05-04 | 中国科学院合肥物质科学研究院 | Super-evaporation heat exchanger |
| CN111050458A (en) * | 2019-12-09 | 2020-04-21 | 重庆大学 | Direct current arc cathode head with inner hole having micro-rib structure |
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