CN2798021Y - Two surface stengthened falling-film type heat transfer tube - Google Patents
Two surface stengthened falling-film type heat transfer tube Download PDFInfo
- Publication number
- CN2798021Y CN2798021Y CN 200520042093 CN200520042093U CN2798021Y CN 2798021 Y CN2798021 Y CN 2798021Y CN 200520042093 CN200520042093 CN 200520042093 CN 200520042093 U CN200520042093 U CN 200520042093U CN 2798021 Y CN2798021 Y CN 2798021Y
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- wing
- tube
- heat transfer
- pipe
- falling film
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- Expired - Fee Related
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- 239000011552 falling film Substances 0.000 title claims abstract description 13
- 230000004323 axial length Effects 0.000 claims description 5
- 239000012467 final product Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 8
- 239000003507 refrigerant Substances 0.000 abstract description 7
- 238000000465 moulding Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 14
- 239000010408 film Substances 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000012530 fluid Substances 0.000 description 9
- 230000010148 water-pollination Effects 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 239000007921 spray Substances 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000003416 augmentation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
本实用新型属传热设备技术领域，具体涉及一种双面强化的降膜式翅片管。由管主体、翅台、翅根槽、内螺纹、凹槽组成。其中，管主体的外表面沿周向分布有突起的翅台，翅台之间沿周向设有翅根槽，管主体的内表面分布有来复线式内螺纹，管主体的内螺纹通过周向凹槽均匀分隔。本实用新型由于设置梯形突起翅台和翅根槽，换热管轴向和周向亲水性均大大提高，提高了制冷剂降膜传热的传热性能；管内使用三维的交叉内螺纹进一步提高了对流换热系数，尤其适合于管内紊流对流传热的场合；可采用一次性成型加工工艺，加工效率高。
The utility model belongs to the technical field of heat transfer equipment, in particular to a double-sided reinforced falling film finned tube. It is composed of tube main body, wing platform, wing root groove, internal thread and groove. Among them, the outer surface of the pipe main body is distributed with protruding fin platforms along the circumferential direction, and fin root grooves are arranged between the fin platforms along the circumferential direction. separated. Because the utility model is provided with trapezoidal protruding fin platforms and wing root grooves, the axial and circumferential hydrophilicity of the heat exchange tube is greatly improved, and the heat transfer performance of the refrigerant falling film heat transfer is improved; the use of three-dimensional intersecting internal threads in the tube further improves The convective heat transfer coefficient is especially suitable for the occasion of turbulent convective heat transfer in the tube; the one-time molding process can be adopted, and the processing efficiency is high.
Description
Technical field
The utility model belongs to the heat-transfer equipment technical field, is specifically related to a kind of two-sided strengthened falling film type finned tube.
Background technology
Circumferentially finned tube has various ways, and wherein screw finned pipe (low ribbed pipe) application in industry is comparatively general, can increase the outer tube surface heat exchange area, is used widely in refrigeration and other industrial circles.Because the problem of hydrostatic column height, in the evaporimeter of absorption refrigerating machine and absorber, extensively adopt the falling film type heat exchanger, its housing is operation under the vacuum condition, use cold-producing medium (for example water) spray (or dripping pouring) on horizontal many rows heat-transfer pipe, the interior refrigerating medium (for example water) of pipe cools off or heats, and utilizes between the interior refrigerating medium of outer cold-producing medium of pipe and pipe and carries out heat exchange.
As in the absorption refrigerating machine evaporimeter, with the heating of the water in pipe tube wall, make the cold-producing medium that is distributed in tube outer surface under vacuum condition, evaporate, the exchange capability of heat of heat-transfer pipe and cold-producing medium are closely related in the distribution and the diffusivity of outer surface, the hydrophily of heat-transfer pipe outer wall improves, can increase effective heat exchange area and attenuate liquid film, so just can reduce the liquid film thermal resistance to promote heat exchange.In practical application, be the phase-change heat-exchange process of fluid outside managing sometimes, actual thermal resistance is approaching in the pipe outer tube, and if design through enhanced heat exchange outside the pipe, the pipe internal thermal resistance may be outer bigger than pipe; At this moment, in pipe, process the enhanced heat exchange surface, further augmentation of heat transfer.Traditional inside intensify heat transfer pipe is the rifling of two dimension in the pipe, or is called internal thread, can further increase heat exchange area as the inner surface that adopts 3D shape, improves the heat transfer coefficient in the pipe.
Traditional intensify heat transfer pipe is provided with circumferential screw thread in that pipe is outer, has increased heat exchange area, but outside managing the easy circumferential flow of refrigerant fluid, axial flow seldom or does not almost have, thereby has limited to the expansion of the humidification zones of cold-producing medium.Tube bundle to many rows' arrangements, the position of refrigerant liquid drippage is approaching, is accumulated to following a few row like this, and the liquid film accumulation is thicker, the liquid film thermal resistance is bigger, influence is conducted heat, and is inhomogeneous in the heat exchanger tube surface distributed, even some zone is " drying ", evaporation and heat-exchange can not be effectively realized in these zones, also cause the tube-surface drop to splash in addition easily, increased circulating mass of refrigerant, also influenced actual effective heat exchange area.
Summary of the invention
The purpose of this utility model is to propose a kind of outer axially hydrophily of pipe that both can increase, and can increase the falling film type heat-transfer pipe of the long-pending further enhanced heat exchange of pipe internal surface again.
The falling film type heat-transfer pipe that the utility model proposes adopts the mode of two-sided strengthened heat transfer, and its structure as depicted in figs. 1 and 2.Wherein, the outer surface of tube body 1 is along the bossed wing platform 2 that circumferentially distributes, and the edge is circumferentially with wing root groove 3 between the wing platform 2; The inner surface of tube body 1 is distributed with the internal thread 4 of rifling formula, and along circumferentially fluted 5, circumferential recess 5 positions and pipe are outer, and wing platform 2 is corresponding accordingly, and the internal thread 4 of tube body 1 is evenly separated by circumferential recess 5.
In the utility model, the axial spacing that the wing platform of tube outer surface is 2 is 0.8～2.8mm, the axial length of wing platform 2 is 0.5～1.87mm, circumferential lengths gets final product less than axial length, the height of wing platform 2 is 0.35～0.8mm, the wing interstation forms long channel along axis, help water in axial diffusion with prolong the time of staying of water on the surface, be convenient to the liquid film evaporation heat exchange, but as the excessive height of wing platform, be unfavorable for the tube-surface hydrophily, and the consumption basepipe materials is many, spend lowly as the height of wing platform, its heat exchange area is less.
In the utility model, wing root groove 3 rectangular or round point shapes, the degree of depth of wing root groove 3 is 0.04～0.12mm, and the diameter of toroidal or rectangular-shaped long limit provide the gasification core of the circumferential current of wing root like this less than 0.5mm, and it steams method heat exchange and also is reinforced.
In the utility model, the height of the internal thread 4 of tube body 1 is 0.15～0.4mm, is 40～46 degree with the angle of axis, and number of starts is 8～30.
In the utility model, the shape of wing platform 2 is cubic taper type, and frustum forms domatic, is beneficial to the diffusion of cold-producing medium (as water).
In the utility model, the setting of heat-transfer pipe surfaces externally and internally had both increased heat exchange area, the tube body outer surface is cut apart axially grooved simultaneously, it is more smooth to make that the liquid film axial flow gets, thereby, improving axial moistening diffusivity greatly, the wing platform of projection and wing root and wing root groove have nothing in common with each other for the cold-producing medium surface tension, thereby formed the power that liquid film flows, promptly improved the hydrophily of heat-transfer pipe outer surface; Because gravity effect, fluid drips along circumferential easily at the liquid film that tube surface forms, and wing root groove can increase the local hydrophily of wing root, and has suitably increased the resistance of circumferential flow, improve the anelasticity of refrigerant, help the evaporation of liquid film on the circumferential tubes surface; Wettability improves like this, makes the coefficient of heat transfer of individual tubes to improve; In addition since fluid drips fall down the position of one deck heat exchanger tube can conversion, help the improvement of one deck heat exchanger tube wettability down equally, each wetted area (being effective heat exchange area) of arranging heat exchanger tube all can improve, so improved the heat exchange property of whole heat exchanger.
But the turbulence level of the interior heat convection of thermoexcell behind the increase internal thread in the tube body, thereby enhanced heat exchange; Particularly adopt outside pipe under the situation of strengthening surface, pipe thermal resistance interior and that pipe is outer is more approaching, to further reinforcement the in managing, can effectively improve whole heat transfer property.The setting of the utility model tube outer surface can periodically be cut apart the internal thread in managing simultaneously, thereby form three-dimensional internal thread, the common internal thread of comparing, both increased heat exchange area, the fluid heat transferring boundary layer is damaged in axial cyclic, the thickness in fluid heat transferring boundary layer can attenuate, further improves convection transfer rate.
The course of work of the present utility model is as follows:
The utility model tube body 1 is fixed on the tube sheet 7 of heat exchanger 6 (evaporimeter), in refrigerating medium (as water) is flowed through the pipe of utility model tube body 1 from hydroecium inlet 12, with the outer cold-producing medium heat exchange of pipe, again from hydroecium outlet 11 outflows; Cold-producing medium passes through spray head 13 sprays on heat exchanger top or drips to drench at the utility model outer wall, under the heating of pipe outer wall, evaporate, become gas, from exporting 10 outflow heat exchangers, unevaporated liquid continues circulation by 8 dozens of circulating pumps to spray head 13, because cold-producing medium evaporation heat absorption, the refrigerating medium in the utility model pipe is cooled.Because the outer wall configuration of aforesaid tube body 1 helps spraying the diffusivity of the cold-producing medium liquid film outside pipe, and prolong liquid film, thereby effectively promote evaporation heat transfer coefficient in the surface time of staying; And in pipe, three-dimensional internal thread structure can effectively improve the intraductal heat exchange coefficient, thereby the whole coefficient of heat transfer is improved, and has also increased the performance of heat exchanger 6 and has reduced metal consumption.
The utility model compared with prior art has following advantage and effect:
(1) because trapezoidal protrusion wing platform and wing root groove are set, compare with traditional continuously circumferential fin, heat exchanger tube axial and circumferential hydrophily all improves greatly, has improved the heat transfer property of cold-producing medium film droping heat-transfer;
(2) three-dimensional intersection internal thread has further improved convection transfer rate in the pipe, the occasion of turbulent convection heat transfer' heat-transfer by convection in being particularly suitable for managing;
(3) can adopt the disposal molding processing technology, the working (machining) efficiency height, the wing height that it is lower, common relatively male-pipe can be saved the matrix raw material more than 30%.
Description of drawings
Fig. 1 is that the utility model appearance over glaze is surveyed schematic diagram.
Fig. 2 is that the utility model inner surface axle is surveyed schematic diagram.
Fig. 3 is the utility model profile.
Fig. 4 is the utility model cross-sectional view.
Fig. 5 is the utility model application implementation illustration.
Number in the figure: 1 is tube body, and 2 is the wing platform, and 3 is the wing groove, and 4 is internal thread, and 5 is groove, and 6 is heat exchanger, and 7 is tube sheet, and 8 is circulating pump, and 9 is refrigerant inlet, and 10 is refrigerant outlet, and 11 are the hydroecium outlet, and 12 are the hydroecium inlet, and 13 is spray head.
The specific embodiment
Further specify the utility model below by embodiment, but be not limited to present embodiment.
The shape of wing platform 2 is cubic taper type, because frustum forms domaticly, is beneficial to the diffusion of cold-producing medium (water); Axially the wing spacing is 2.31mm, and wing platform 2 axial lengths are 1.8mm, and wing platform 2 circumferential lengths are 0.6mm.By the quantity of Fig. 3 circumference upper fin platform is 40-80, forms long channel along axis wing interstation like this, helps water in axial diffusion with prolong water in the time of staying on surface, is convenient to the liquid film evaporation heat exchange.The height of wing platform 2 is 0.65mm, and too high height is unfavorable for the tube-surface hydrophily, and consumes many, the low excessively wing platforms of basepipe materials, and its heat exchange area is less.Wing root groove is a rectangle, and the degree of depth of wing root groove is 0.08mm, and rectangle length provides the gasification core of the circumferential current of wing root like this less than 0.5mm, steams the method heat exchange and is reinforced.
The utility model can process internal thread simultaneously in pipe, with the coefficient of heat transfer in the enhanced tube, the height of tube body internal thread is high more, number of starts is many more, its intraductal heat exchange is strengthened also many more, but has also increased the resistance of tube fluid simultaneously, so the height of internal thread 4 is 0.3mm, with the angle C of axis be 46 degree, number of starts is 24.Because the outer wing platform of pipe is provided with and processing, in pipe, can nature formation groove 5 internal thread be pressed the fixed range partition, formed three-dimensional inside strengthening surface like this, compare common internal thread, further increase heat exchange area, the fluid heat transferring boundary layer is damaged in axial cyclic simultaneously, but therefore the thickness in attenuate fluid heat transferring boundary layer can improve convection transfer rate.
Claims (5)
1, a kind of two-sided strengthened falling film type heat-transfer pipe, the outer surface that it is characterized in that tube body (1) is along the bossed wing platform (2) that circumferentially distributes, and the edge is circumferentially with wing root groove (3) between the wing platform (2); The inner surface of tube body (1) is distributed with the internal thread (4) of rifling formula, and the edge is fluted (5) circumferentially, and circumferential recess (5) position is corresponding with the outer corresponding wing platform (2) of pipe, and the internal thread (4) of tube body (1) is by evenly separation of circumferential recess (5).
2, two-sided strengthened falling film type heat-transfer pipe according to claim 1, it is characterized in that the axial spacing between the wing platform (2) of tube outer surface is 0.8～2.8mm, the axial length of wing platform (2) is 0.5～1.87mm, circumferential lengths gets final product less than axial length, and the height of wing platform (2) is 0.35～0.8mm.
3, two-sided strengthened falling film type heat-transfer pipe according to claim 1 is characterized in that the rectangular or round point shape of wing root groove (3), and the degree of depth of wing root groove (3) is 0.04～0.12mm.
4, two-sided strengthened falling film type heat-transfer pipe according to claim 1 is characterized in that the height of the internal thread (4) of tube body (1) is 0.15～0.4mm, is 40～46 degree with the angle of axis, and number of starts is 8～30.
5, two-sided strengthened falling film type heat-transfer pipe according to claim 1 is characterized in that the shape of wing platform (2) is cubic taper type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520042093 CN2798021Y (en) | 2005-06-02 | 2005-06-02 | Two surface stengthened falling-film type heat transfer tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520042093 CN2798021Y (en) | 2005-06-02 | 2005-06-02 | Two surface stengthened falling-film type heat transfer tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2798021Y true CN2798021Y (en) | 2006-07-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200520042093 Expired - Fee Related CN2798021Y (en) | 2005-06-02 | 2005-06-02 | Two surface stengthened falling-film type heat transfer tube |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813433A (en) * | 2010-03-18 | 2010-08-25 | 金龙精密铜管集团股份有限公司 | Enhanced heat transfer tube for condensation |
| CN101338987B (en) * | 2007-07-06 | 2011-05-04 | 高克联管件(上海)有限公司 | Heat transfer pipe for condensation |
| CN101338959B (en) * | 2008-01-11 | 2011-06-08 | 高克联管件(上海)有限公司 | Efficient shell and tube type condenser |
| CN102121804A (en) * | 2011-03-04 | 2011-07-13 | 无锡化工装备有限公司（原无锡化工装备总厂) | Fixed tube-sheet heat exchanger with grooved parent tube surfaces |
| CN102401598A (en) * | 2011-11-23 | 2012-04-04 | 苏州新太铜高效管有限公司 | Falling film evaporation heat exchange pipe |
| CN102581583A (en) * | 2011-01-14 | 2012-07-18 | 浙江宏天铜业有限公司 | Copper heat tube with high-tooth fins and production technology of copper heat tube |
| CN102671399A (en) * | 2012-05-23 | 2012-09-19 | 中国化学工程第十一建设有限公司 | a reboiler |
| CN102138057B (en) * | 2008-07-24 | 2013-01-02 | 丰田自动车株式会社 | Heat exchanger and method of manufacturing same |
| CN102980432A (en) * | 2012-11-12 | 2013-03-20 | 沃林/维兰德传热技术有限责任公司 | Evaporation heat transfer pipe with hollow cavity body |
| CN103017593A (en) * | 2012-12-13 | 2013-04-03 | 吉林大学 | Bionic surface structure for strengthening evaporation heat exchanging of liquid film |
| CN103157965A (en) * | 2011-12-12 | 2013-06-19 | 浙江宏天铜业有限公司 | Production technology of high-tooth fin copper heat tube |
| CN104006579A (en) * | 2014-05-20 | 2014-08-27 | 江苏萃隆精密铜管股份有限公司 | Efficient heat-exchange tube for evaporator |
| CN105300161A (en) * | 2014-07-11 | 2016-02-03 | 杭州三花研究院有限公司 | Heat exchanger and cooling fin thereof |
| CN106767099A (en) * | 2016-12-20 | 2017-05-31 | 江苏萃隆精密铜管股份有限公司 | A kind of efficient heat conducting tube of inner surface enhanced type |
| CN108020110A (en) * | 2016-10-31 | 2018-05-11 | 中国科学院工程热物理研究所 | There is the heat exchanger tube for managing outer microflute group for function of mechanical steam recompression system |
| CN110195994A (en) * | 2019-04-29 | 2019-09-03 | 西安交通大学 | A kind of high efficiency composition bilateral augmentation of heat transfer pipe |
| CN111288831A (en) * | 2020-03-07 | 2020-06-16 | 广东龙丰精密铜管有限公司 | Falling film type efficient outer finned tube |
-
2005
- 2005-06-02 CN CN 200520042093 patent/CN2798021Y/en not_active Expired - Fee Related
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101338987B (en) * | 2007-07-06 | 2011-05-04 | 高克联管件(上海)有限公司 | Heat transfer pipe for condensation |
| CN101338959B (en) * | 2008-01-11 | 2011-06-08 | 高克联管件(上海)有限公司 | Efficient shell and tube type condenser |
| CN102138057B (en) * | 2008-07-24 | 2013-01-02 | 丰田自动车株式会社 | Heat exchanger and method of manufacturing same |
| CN101813433A (en) * | 2010-03-18 | 2010-08-25 | 金龙精密铜管集团股份有限公司 | Enhanced heat transfer tube for condensation |
| CN101813433B (en) * | 2010-03-18 | 2012-10-24 | 金龙精密铜管集团股份有限公司 | Enhanced heat transfer tube for condensation |
| US9683791B2 (en) | 2010-03-18 | 2017-06-20 | Golden Dragon Precise Copper Tube Group Inc. | Condensation enhancement heat transfer pipe |
| CN102581583A (en) * | 2011-01-14 | 2012-07-18 | 浙江宏天铜业有限公司 | Copper heat tube with high-tooth fins and production technology of copper heat tube |
| CN102121804A (en) * | 2011-03-04 | 2011-07-13 | 无锡化工装备有限公司（原无锡化工装备总厂) | Fixed tube-sheet heat exchanger with grooved parent tube surfaces |
| CN102401598A (en) * | 2011-11-23 | 2012-04-04 | 苏州新太铜高效管有限公司 | Falling film evaporation heat exchange pipe |
| CN103157965A (en) * | 2011-12-12 | 2013-06-19 | 浙江宏天铜业有限公司 | Production technology of high-tooth fin copper heat tube |
| CN102671399A (en) * | 2012-05-23 | 2012-09-19 | 中国化学工程第十一建设有限公司 | a reboiler |
| CN102671399B (en) * | 2012-05-23 | 2014-07-16 | 中国化学工程第十一建设有限公司 | Reboiler |
| CN102980432A (en) * | 2012-11-12 | 2013-03-20 | 沃林/维兰德传热技术有限责任公司 | Evaporation heat transfer pipe with hollow cavity body |
| CN103017593B (en) * | 2012-12-13 | 2014-06-18 | 吉林大学 | Bionic surface structure for strengthening evaporation heat exchanging of liquid film |
| CN103017593A (en) * | 2012-12-13 | 2013-04-03 | 吉林大学 | Bionic surface structure for strengthening evaporation heat exchanging of liquid film |
| CN104006579A (en) * | 2014-05-20 | 2014-08-27 | 江苏萃隆精密铜管股份有限公司 | Efficient heat-exchange tube for evaporator |
| CN104006579B (en) * | 2014-05-20 | 2016-03-02 | 江苏萃隆精密铜管股份有限公司 | A kind of high-efficient heat-exchanger of evaporimeter |
| CN105300161B (en) * | 2014-07-11 | 2018-06-01 | 杭州三花研究院有限公司 | Heat exchanger and its radiating fin |
| CN105300161A (en) * | 2014-07-11 | 2016-02-03 | 杭州三花研究院有限公司 | Heat exchanger and cooling fin thereof |
| CN108020110A (en) * | 2016-10-31 | 2018-05-11 | 中国科学院工程热物理研究所 | There is the heat exchanger tube for managing outer microflute group for function of mechanical steam recompression system |
| CN106767099A (en) * | 2016-12-20 | 2017-05-31 | 江苏萃隆精密铜管股份有限公司 | A kind of efficient heat conducting tube of inner surface enhanced type |
| CN110195994A (en) * | 2019-04-29 | 2019-09-03 | 西安交通大学 | A kind of high efficiency composition bilateral augmentation of heat transfer pipe |
| CN110195994B (en) * | 2019-04-29 | 2021-07-13 | 西安交通大学 | A high-efficiency composite double-sided reinforced heat transfer tube |
| CN111288831A (en) * | 2020-03-07 | 2020-06-16 | 广东龙丰精密铜管有限公司 | Falling film type efficient outer finned tube |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |