CN103486894A - Enhanced heat transfer tube for falling film evaporator and manufacturing method thereof - Google Patents
Enhanced heat transfer tube for falling film evaporator and manufacturing method thereof Download PDFInfo
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- CN103486894A CN103486894A CN201310469415.9A CN201310469415A CN103486894A CN 103486894 A CN103486894 A CN 103486894A CN 201310469415 A CN201310469415 A CN 201310469415A CN 103486894 A CN103486894 A CN 103486894A
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- heat transfer
- transfer tube
- film evaporator
- falling film
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Abstract
The invention provides an enhanced heat transfer tube for a falling film evaporator and a manufacturing method of the enhanced heat transfer tube. The enhanced heat transfer tube for the falling film evaporator comprises a tube body and a plurality of fin strips wound on the outer surface of the tube body along a spiral wire coil, and the fin strips are circumferentially cut into a plurality of fins. Grooves are formed in one sides of the fins, and protrusions are arranged on one sides of the upper surfaces of the grooves. According to the enhanced heat transfer tube for the falling film evaporator, small holes are formed between the grooves of the fins and axial adjacent fins, troughs are formed between the protrusions on one sides of the tops of the grooves and the coaxial adjacent fin protrusions, the rotating direction of the troughs is consistent with the rotating direction of the fin strips, the circumferential continuous fins are made to form an annular flow channel at the top, an annular downward flow channel can be formed in the outer surface of the tube body, refrigerants dropping on the annular downward flow channel can be guided to flow downwards, and therefore film falling heat transfer efficiency can be improved. Inner teeth are arranged on the inner surface of the tube body, the heat transfer area of the heat transfer tube is increased, the turbulence of fluid in the heat transfer tube can be enhanced, and the heat exchange efficiency inside the tube is improved.
Description
Technical field
The present invention relates to a kind of evaporation heat transfer pipe and preparation method thereof, especially a kind of enhanced heat transfer tube used for falling film evaporator and preparation method thereof.
Background technology
Falling film evaporator is because the coolant injection amount is few, and heat transfer efficiency is high, has been widely used in refrigeration air-conditioner and chemical field.Be provided with the heat-transfer pipe that many row of horizontal are placed in this kind of heat exchanger, evenly spray cold-producing medium on the top layer heat-transfer pipe along heat-transfer pipe length downwards from the heat transmitter top, cold-producing medium again from row's heat-transfer pipe arrange by row heat-transfer pipe drippage downwards, heat-transfer pipe and drippage cold-producing medium heat exchange thereon, guarantee the cold-producing medium evaporation.For improving the heat transfer effect of falling film evaporation, whether cold-producing medium that on the one hand will the row's of assurance heat-transfer pipe outer surface can all be dropped in lower row's heat-transfer pipe outer surface, can have enough cold-producing mediums to soak heat-transfer pipe; Also to guarantee that on the other hand heat-transfer pipe provides cold-producing medium to evaporate the required nucleus of boiling.Therefore, the heat transfer effect of the heat-transfer pipe in falling film evaporator to the assurance evaporimeter, and the heat exchange efficiency that improves falling film evaporation is had to vital effect.
Some producer adopts the full-liquid type evaporation tube as patent of invention ZL200510134630.9 to be used for falling film evaporator at present, although can forming cold-producing medium, the full-liquid type heat-transfer pipe evaporates the needed nucleus of boiling, can strengthen heat-transfer effect, but the outer surface of the fin of this heat-transfer pipe is smooth, be unfavorable for fully contacting of itself and refrigerant; In addition, this heat-transfer pipe can not effectively guide cold-producing medium drippage downwards by row, and cold-producing medium is dripped does not from top to bottom have directionality, skew easily occurs or splash and leave heat-transfer pipe, can not participate in heat exchange and cause thermal loss to make heat-transfer effect desirable not to the utmost.
Summary of the invention
The invention provides a kind of enhanced heat transfer tube used for falling film evaporator that improves whole heat transfer efficiency and preparation method thereof.
Realize the enhanced heat transfer tube used for falling film evaporator of one of the object of the invention, comprise body and many wing bars that are coiled in described outer surface of tube body along helix, described wing bar is circumferentially cut into a plurality of fins; Described fin one side is provided with groove, and a side of described groove upper surface is provided with projection.
Described projection is positioned at bottom or the top of groove.
Described wing bar per inch vertically is provided with 26～60, and the helical angle of described wing bar is 0.3～2.5 °.
Described fin is along circumferentially being distributed as 60～160, and the circumferential spacing of described fin is 0.05～0.5 mm, and the width of described groove is 0.1～0.8 mm.
The spacing of adjacent described projection is 0.1～0.5 mm, and described height of projection is 0.1～0.2 mm.
The inner surface of described body is provided with many internal tooths.
Described internal tooth is screw-like, and described internal tooth axial cross section is the class triangle.
The addendum angle scope of described internal tooth is 10～120 °, and the height of described internal tooth is 0.1～0.6 mm.
The axis angle scope of described internal tooth and body is 20～70 °, and described internal tooth number is 6～90.
Realize the preparation method of two the enhanced heat transfer tube used for falling film evaporator of the object of the invention, comprise the steps:
(1) first on the outer surface of heat-transfer pipe body, process spiral helicine wing bar;
(2) then utilize cutting knife that spiral helicine wing bar is divided into to a plurality of fins;
(3) with the tumbling cutter, one of fin is sidewindered to swaging again and become groove;
(4) and then utilize cutter to suppress projection at the upper surface of groove.
The beneficial effect of enhanced heat transfer tube used for falling film evaporator of the present invention and preparation method thereof is as follows:
Enhanced heat transfer tube used for falling film evaporator of the present invention, form aperture between the groove of fin and axial adjacent fins, form groove between the projection of groove top one side and axial adjacent fins projection, the direction of rotation of described groove is consistent with the direction of rotation of wing bar, make circumferentially continuous fin form the hoop runner at top, can form hoop to lower flow channel at outer surface of tube body, the energy drainage is dripped refrigerant thereon and is flowed downward, thereby can improve film droping heat-transfer efficiency.The inner surface of body is provided with internal tooth, increases the heat transfer area of heat-transfer pipe, and can strengthen heat-transfer pipe inner fluid turbulent flow, and intraductal heat exchange efficiency is increased.
Enhanced heat transfer tube used for falling film evaporator of the present invention has improved the coefficient of heat transfer on the inside and outside surface of heat-transfer pipe, makes to obtain Combinatorial Optimization with heat transfer outside a tube efficiency in pipe, has improved the whole heat transfer efficiency of heat-transfer pipe, is suitable for the evaporimeter uses such as falling film evaporator.
The preparation method of enhanced heat transfer tube used for falling film evaporator of the present invention, adopt roll extrusion and rotary pressing processing not to increase the manufactured materials of heat-transfer pipe, both saved production cost, can increase again intensity and the heat transfer area of heat-transfer pipe.
The accompanying drawing explanation
The structural representation that Fig. 1 is enhanced heat transfer tube used for falling film evaporator of the present invention.
The partial perspective view that Fig. 2 is Fig. 1.
The specific embodiment
Embodiment 1
As shown in Figure 1, 2, enhanced heat transfer tube used for falling film evaporator of the present invention, comprise body 1 and many wing bars 2 that are coiled in described body 1 outer surface along helix, and described wing bar 2 is circumferentially cut into a plurality of fins 4; Described fin 4 one sides are provided with groove 3, and a side of described groove 3 upper surfaces is provided with projection 5.
Described protruding 5 are positioned at the bottom of groove 3, and described protruding 5 also can be positioned at the top of groove.
Described wing bar 2 per inch vertically is provided with 26～60, and the helical angle of described wing bar 2 is 0.3～2.5 °.Described fin 4 is along circumferentially being distributed as 60～160, and the circumferential spacing L1 of described fin 4 is 0.05～0.5 mm, and the width H1 of described groove 3 is 0.1～0.8 mm.Adjacent described protruding 5 spacing L2 is 0.1～0.5 mm, and described protruding 5 height H 2 are 0.1～0.2 mm.
The inner surface of described body 1 is provided with many internal tooths 6.Described internal tooth 6 is screw-like, can be also straight-tooth.
Described internal tooth 6 axial cross sections are the class triangle, can be also trapezoidal, semicircle or other is irregularly shaped.
The scope of the addendum angle r of described internal tooth 6 is 10～120 °.Described internal tooth 6 is 20～70 ° with the axis angle scope of body 1, and described internal tooth 6 numbers are 6～90, and the height H 3 of described internal tooth 6 is 0.1～0.6 mm.
Embodiment 2
As shown in Figure 1, 2, the enhanced heat transfer tube used for falling film evaporator of the present embodiment as different from Example 1: the external diameter of body 1 is 18.92mm, and the body wall thickness of heat transfer segment is 0.635mm.The spacing L1 of fin 4 is 0.406mm, and the width H1 of groove 3 is 0.6mm.Fin 4 outer surface tops extrude projection 5, and axially 5 of adjacent protrusion form groove, and the spacing of adjacent protrusion 5 (width of groove) L2 is 0.26mm, and the height H 2 of projection 5 is 0.15mm; The interior screw-shaped internal tooth 6 that simultaneously processes of the body 1 of heat-transfer pipe, internal tooth 6 numbers are 52, the height H 3 of internal tooth 6 is 0.35 mm, with body 1 axis angle be 45 °, addendum angle r is 30 °.
The contrast situation that following table is the present embodiment 2 and common tube:
Embodiment 3
As shown in Figure 1, 2, the enhanced heat transfer tube used for falling film evaporator of the present embodiment as different from Example 1: the external diameter of body 1 is 18.92mm, and the body wall thickness of heat transfer segment is 0.635mm.The spacing L1 of fin 4 is 0.35mm, and the width H1 of groove 3 is 0.3mm.Fin 4 outer surface tops extrude projection 5, and axially 5 of adjacent protrusion form groove, and the spacing of adjacent protrusion 5 (width of groove) L2 is 0.1mm, and the height H 2 of projection 5 is 0.1mm; The interior screw-shaped internal tooth 6 that simultaneously processes of the body 1 of heat-transfer pipe, internal tooth 6 numbers are 60, the height H 3 of internal tooth 6 is 0.1 mm, with body 1 axis angle be 20 °, addendum angle r is 120 °.
The contrast situation that following table is the present embodiment 3 and common tube:
Embodiment 4
As shown in Figure 1, 2, the enhanced heat transfer tube used for falling film evaporator of the present embodiment as different from Example 1: the external diameter of body 1 is 18.92mm, and the body wall thickness of heat transfer segment is 0.635mm.The spacing L1 of fin 4 is 0.5mm, and the width H1 of groove 3 is 0.8mm.Fin 4 outer surface tops extrude projection 5, and axially 5 of adjacent protrusion form groove, and the spacing of adjacent protrusion 5 (width of groove) L2 is 0.35mm, and the height H 2 of projection 5 is 0.2mm; The interior screw-shaped internal tooth 6 that simultaneously processes of the body 1 of heat-transfer pipe, internal tooth 6 numbers are 6, the height H 3 of internal tooth 6 is 0.6 mm, with body 1 axis angle be 55 °, addendum angle r is 10 °.
The contrast situation that following table is the present embodiment 4 and common tube:
According to actual test data statistics, when the enhanced heat transfer tube used for falling film evaporator of the present embodiment 2,3,4 adopts refrigerant R134a, the falling film evaporator heat transfer property improves approximately 10% than common heat-transfer pipe.
Enhanced heat transfer tube used for falling film evaporator of the present invention, consider heat transfer property and the cost performance of metal material, and the material of heat-transfer pipe preferably adopts copper product to make, and also can select the metal materials such as copper alloy, aluminium, aluminium alloy, mild steel, copper aluminium be compound.
The operation principle of enhanced heat transfer tube used for falling film evaporator of the present invention is as follows:
As shown in Figure 1, 2, enhanced heat transfer tube used for falling film evaporator of the present invention is at many apertures of groove 3 and 4 formation of adjacent fins, the nucleus of boiling when cold-producing medium evaporation is provided, thus strengthened evaporation and heat-exchange; The circular passage that aperture is connected to form along spiral, be beneficial to the cold-producing medium hoop and flow, the disturbance of phase while strengthening the cold-producing medium evaporation, thus strengthen heat transfer effect; The wing bar 2 of spiral is divided into and is divided into a plurality of fins 4, make between each aperture to exist the axial and circumferential gap, be beneficial to cold-producing medium and enter aperture, while guaranteeing the cold-producing medium evaporation, cold-producing medium can fill into the discharge with refrigerant vapour endlessly, make evaporation can continue to carry out, form continuously evaporation process.
The upper surface top of the groove 3 of fin 4 is provided with projection 5, form groove at adjacent fins 4 tops, groove circumferentially is connected to form the hoop runner along body, cold-producing medium that can be unnecessary to the heat-transfer pipe outer surface carries out drainage, avoid cold-producing medium to be deposited in outer surface of tube body, can prevent that on the one hand body 1 outer surface from forming blocked up liquid film and being unfavorable for conducting heat, and cause lower comb to lack cold-producing medium and dry blowing occurs; On the other hand, can the row's of preventing cold-producing medium be dropped on blocked up liquid film and cause cold-producing medium to splash, and can not participate in heat exchange, cause heat transfer efficiency to reduce; The hoop runner also can guarantee the directionality that cold-producing medium falls, while preventing the cold-producing medium drippage, be offset, on body under can not dropping onto, thereby make lower comb lack cold-producing medium, cause dry blowing, make cold-producing medium not contact with body 1 simultaneously and cause evaporator effectiveness to reduce.
The preparation method of enhanced heat transfer tube used for falling film evaporator of the present invention, comprise the steps:
(1) first on the outer surface of heat-transfer pipe body, process spiral helicine wing bar;
(2) then utilize cutting knife that spiral helicine wing bar is divided into to a plurality of fins;
(3) with the tumbling cutter, one of fin is sidewindered to swaging again and become groove;
(4) and then utilize cutter to suppress projection at the upper surface of groove.
Adopt roll extrusion and rotary pressing processing not to increase the manufactured materials of heat-transfer pipe, both saved production cost, can increase again intensity and the heat transfer area of heat-transfer pipe.
Embodiment recited above is described the preferred embodiment of the present invention; not scope of the present invention is limited; design under spiritual prerequisite not breaking away from the present invention; various distortion and improvement that the common engineers and technicians in this area make technical solution of the present invention, all should fall in the definite protection domain of claims of the present invention.
Claims (10)
1. an enhanced heat transfer tube used for falling film evaporator, comprise body and many wing bars that are coiled in described outer surface of tube body along helix, and described wing bar is circumferentially cut into a plurality of fins; It is characterized in that: described fin one side is provided with groove, and a side of described groove upper surface is provided with projection.
2. enhanced heat transfer tube used for falling film evaporator according to claim 1, it is characterized in that: described projection is positioned at bottom or the top of groove.
3. enhanced heat transfer tube used for falling film evaporator according to claim 1 and 2, it is characterized in that: described wing bar per inch vertically is provided with 26～60, and the helical angle of described wing bar is 0.3～2.5 °.
4. enhanced heat transfer tube used for falling film evaporator according to claim 1 and 2 is characterized in that: described fin is along circumferentially being distributed as 60～160, and the circumferential spacing of described fin is 0.05～0.5 mm, and the width of described groove is 0.1～0.8 mm.
5. enhanced heat transfer tube used for falling film evaporator according to claim 1 and 2, it is characterized in that: the spacing of adjacent described projection is 0.1～0.5 mm, described height of projection is 0.1～0.2 mm.
6. enhanced heat transfer tube used for falling film evaporator according to claim 1 and 2, it is characterized in that: the inner surface of described body is provided with many internal tooths.
7. enhanced heat transfer tube used for falling film evaporator according to claim 6, it is characterized in that: described internal tooth is screw-like, described internal tooth axial cross section is the class triangle.
8. enhanced heat transfer tube used for falling film evaporator according to claim 6, it is characterized in that: the axis angle scope of described internal tooth and body is 20～70 °, described internal tooth number is 6～90.
9. enhanced heat transfer tube used for falling film evaporator according to claim 6, it is characterized in that: the addendum angle scope of described internal tooth is 10～120 °, the height of described internal tooth is 0.1～0.6 mm.
10. the preparation method of the arbitrary described enhanced heat transfer tube used for falling film evaporator of claim 1～9, comprise the steps:
(1) first on the outer surface of heat-transfer pipe body, process spiral helicine wing bar;
(2) then utilize cutting knife that spiral helicine wing bar is divided into to a plurality of fins;
(3) with the tumbling cutter, one of fin is sidewindered to swaging again and become groove;
(4) and then utilize cutter to suppress projection at the upper surface of groove.
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| CN201310469415.9A CN103486894A (en) | 2013-10-10 | 2013-10-10 | Enhanced heat transfer tube for falling film evaporator and manufacturing method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387131A (en) * | 2018-05-02 | 2018-08-10 | 珠海格力电器股份有限公司 | Heat exchange tube, heat exchanger and heat pump unit |
| CN109141094A (en) * | 2018-08-30 | 2019-01-04 | 珠海格力电器股份有限公司 | Heat exchange tube and air conditioner |
| CN110425773A (en) * | 2019-07-26 | 2019-11-08 | 江苏萃隆精密铜管股份有限公司 | A kind of full liquid heat-exchange pipe for evaporimeter |
| CN113587496A (en) * | 2021-08-01 | 2021-11-02 | 合肥美菱有色金属制品有限公司 | Pipeline fin evaporator |
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| CN1982827A (en) * | 2005-12-13 | 2007-06-20 | 金龙精密铜管集团股份有限公司 | Flooded copper-evaporating heat-exchanging pipe for electric refrigerator set |
| CN101498532A (en) * | 2008-02-01 | 2009-08-05 | 金龙精密铜管集团股份有限公司 | Evaporating tube for central air-conditioner |
| CN101556124A (en) * | 2009-04-10 | 2009-10-14 | 金龙精密铜管集团股份有限公司 | Heat transfer tube |
| CN102121805A (en) * | 2011-04-07 | 2011-07-13 | 金龙精密铜管集团股份有限公司 | Enhanced heat transfer tube used for falling film evaporator |
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2013
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| CN1982827A (en) * | 2005-12-13 | 2007-06-20 | 金龙精密铜管集团股份有限公司 | Flooded copper-evaporating heat-exchanging pipe for electric refrigerator set |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108387131A (en) * | 2018-05-02 | 2018-08-10 | 珠海格力电器股份有限公司 | Heat exchange tube, heat exchanger and heat pump unit |
| WO2019210690A1 (en) * | 2018-05-02 | 2019-11-07 | 珠海格力电器股份有限公司 | Heat exchange tube, heat exchanger and heat pump unit |
| CN109141094A (en) * | 2018-08-30 | 2019-01-04 | 珠海格力电器股份有限公司 | Heat exchange tube and air conditioner |
| CN110425773A (en) * | 2019-07-26 | 2019-11-08 | 江苏萃隆精密铜管股份有限公司 | A kind of full liquid heat-exchange pipe for evaporimeter |
| CN110425773B (en) * | 2019-07-26 | 2024-11-01 | 江苏萃隆精密铜管股份有限公司 | Heat exchange tube for flooded evaporator |
| CN113587496A (en) * | 2021-08-01 | 2021-11-02 | 合肥美菱有色金属制品有限公司 | Pipeline fin evaporator |
| CN113587496B (en) * | 2021-08-01 | 2022-07-22 | 合肥美菱有色金属制品有限公司 | Pipeline fin evaporator |
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Application publication date: 20140101 |