CN101458048A - Heat transfer tube for evaporator and method of manufacturing same - Google Patents
Heat transfer tube for evaporator and method of manufacturing same Download PDFInfo
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- CN101458048A CN101458048A CNA2008101366255A CN200810136625A CN101458048A CN 101458048 A CN101458048 A CN 101458048A CN A2008101366255 A CNA2008101366255 A CN A2008101366255A CN 200810136625 A CN200810136625 A CN 200810136625A CN 101458048 A CN101458048 A CN 101458048A
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- conduit
- heat transfer
- groove
- transfer tube
- evaporator
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Abstract
The invention relates to a heat transfer pipe for an evaporator and a production method thereof. The heat transfer pipe is provided with a pipe body with an inner cavity, and fins arranged on the peripheral surface outside the pipe body and spirally distributed along the axial direction of the pipe body. Lateral walls of the fins incline from the bottoms of the fins towards the outside of the tops facing the fins. Empty cavities, the opening sections of which are less than the bottom areas, are formed between adjacent fins; and the bottom surface of each empty cavity is also provided with a first groove and a second groove crossed with the first groove, at least either the first groove or the second groove comprise a plurality of grooves, and the first groove and the second groove have a plurality of crossing nodes. The first grooves, the second grooves and the nodes of the first and the second grooves have worse moisturizing property than the bottoms of the empty cavities so that activation energy or superheat degree of foam generation and growth can be reduced, more gasification core points can be formed, and more foams can be formed so as to improve boiling heat exchange capability. The pipe-outside boiling heat exchange efficiency of the heat transfer pipe is higher than a conventional heat transfer pipe with smooth empty cavity bottom by 7-12 percent.
Description
Technical field
The present invention relates to heat-transfer pipe and manufacture method thereof that a kind of evaporimeter is used.
Background technology
Heat-transfer pipe is usually used in evaporimeter, for example the flooded evaporator in the central air conditioner system handpiece Water Chilling Units.Heat-transfer pipe comprise form on body with inner chamber and the tube wall along body axially form on the fin that distributes of shape and the inboard wall of tube body in the shape of a spiral along the axial conduit that distributes of shape in the shape of a spiral of body.In process, described fin top is along the uniform otch of the fin hand of spiral, form boss between the adjacent cut on the same fin, boss is carried out mechanical press, make boss extend to the fin both sides, reach the degree that scoops out mutually with adjacent fins, the hole that the little lower room of opening is big above final the formation (bottom surface in hole is the pipe outer wall surface between the original adjacent fins, and the sidewall in hole i.e. the surface to the hole inner inclination for being extended to form to the fin both sides by boss).
In heat exchanging process, hot fluid flows through in managing and energy is passed to the outer liquid of pipe, manage behind the outer heated liquid generation a large amount of vapor bubbles of generation of seething with excitement, thereby takes away the energy on the body.Bubble is always also grown up gradually in the bottom or the root formation in hole in evaporation process, overflows from the opening in hole at last.Behind the bubble disengagement, this place forms negative pressure, and liquid replenishes rapidly by the passage between the hole from this opening or its elsewhere opening.This process constantly repeats, and liquid refrigerant is constantly evaporation and boiling in each hole of outer metallic surface.The outer surface of fin also processes the hole of the vapor bubbles discharge that is beneficial in the hole sometimes.
Though the structure of fin can strengthen the exchange capability of heat of heat-transfer pipe, the fluid boiling coefficient of heat transfer in the hole is not high, and still the heat-exchange capacity to heat-transfer pipe produces restriction.
Summary of the invention
Technical problem to be solved by this invention is the fluid boiling coefficient of heat transfer that improves in the hole, and then improves the heat-exchange capacity of heat-transfer pipe.
For achieving the above object, the technical solution used in the present invention is: a kind of heat transfer tube for evaporator, comprise body with inner chamber, be arranged on the fin axial in spiral distribution on the body outer peripheral face along body, the sidewall of described fin from the bottom of fin to the top outer inclination towards fin, form the long-pending hole of opening section between the adjacent fins less than floor space, second conduit that also offers first conduit on the bottom surface in described hole and intersect with described first conduit, a kind of at least the first conduit or second conduit is many, and first conduit and second conduit have a plurality of crossing nodes.
Another technical problem to be solved by this invention provides a kind of heat-transfer pipe manufacture method that can improve the heat-exchange capacity of heat-transfer pipe.
For achieving the above object, the technical solution used in the present invention is: at first, cut out groove at the outer surface of body along the hand of spiral, remain boss between the adjacent grooves;
Bottom land at groove cuts the described first crossing conduit and second conduit;
Secondly, the end face at boss cuts out breach;
Once more, boss is rolled, make boss, form the fin of moulding to circumferential extension.
Because technique scheme utilization, the present invention compared with prior art has following advantage: the bottom wettability in first conduit, second conduit and the relative hole of node of the two is poor, can reduce the activation energy or the degree of superheat that bubble forms and grows, can form more gasification core point, form more bubble, and then improve the boiling heat transfer ability.The outer boiling heat transfer coefficient of pipe of the present invention improves 7%～12% than bottom, conventional smooth hole heat-transfer pipe.
Description of drawings
Fig. 1 is the main cutaway view of heat-transfer pipe of the present invention;
Fig. 2 is the expanded view of heat-transfer pipe outer surface, and expansion mode is: shear the back in fin top along body axial line bearing of trend and launch;
Fig. 3 is the enlarged drawing of I part among Fig. 1, and for simplicity, the spiral-shaped of fin do not show;
Fig. 4 is the expanded view after dissecing along the A-A direction among Fig. 3, and expansion mode is: shear the back expansion at A place along body axial line bearing of trend;
Fig. 5 I has shown process of the present invention;
Fig. 5 II is the dissect expanded view corresponding with each step among Fig. 5 I, and expansion mode is: shear the back at the B place along body axial line bearing of trend and launch;
Fig. 6 offers the heat-transfer pipe of the netted conduit of V-arrangement and the coefficient of heat transfer comparison diagram of the heat-transfer pipe that the bottom surface, hole is smooth flat for the bottom surface, hole.
Wherein: 1, body, 2, fin, 20, groove, 21, the hole, 211, opening, 22, boss, 23, breach, 3, conduit, 41, hole, 5, node, 51, first conduit, 52, second conduit.
The specific embodiment
Below the specific embodiment of the present invention is described:
Referring to heat transfer tube for evaporator shown in Figure 1, comprise body 1, be arranged on fin 2 axial in spiral distribution on body 1 outer peripheral face, be opened in the conduit 3 on body 1 inner peripheral surface along the profile of tooth axial in spiral distribution of body 1 along body 1 with inner chamber.
Referring to Fig. 3, the sidewall of described fin 2 from the bottom of fin 2 to the top outer inclination towards fin 2, form the hole 21 of opening 211 sectional areas less than floor space thus between the adjacent fins 2, described opening 211 is shape distribution in the shape of a spiral (this helical form shows in Fig. 3) also.In the heat exchanging process, the bottom surface in this hole 21 is positions that bubble forms, grows up, can be after bubble is grown up from the hole 21 opening 211 overflow.
Also offer on the bottom surface in described hole 21 along first conduit 51 axial in spiral distribution of body 1 and many second conduits 52 that intersect vertically with described first conduit, form netted groove, described first conduit 51 and second conduit 52 intersect a plurality of nodes 5 of formation, referring to Fig. 3, Fig. 4, described first conduit 51 and second conduit 52 are " V " shape groove, this mainly is because " V " shape groove relatively is easy to annular knurl processing, and " V " shape groove wettability is relatively poor, can reduce the activation energy or the degree of superheat that bubble forms and grows, can form more gasification core point, form more bubble, and then improve the boiling heat transfer ability.Certainly, as another optimal way, described first conduit 51 and second conduit 52 can also be the little dovetail grooves in the big end, top, and it is processed also than being easier to.
The top of described fin 2 also offers many holes 41 that intersect with described opening 211, and effusion and the outer liquid of pipe that described hole 41 helps bubble are filled in the hole 21.
The depth D of described first conduit 51 and second conduit 52 is 0.02～0.1mm; Described node 5 is 30～50/week; Described conduit 3 is 1～60/week (along a week of spiral, i.e. a helical pitch), and the height C of described conduit 3 is 0.1～0.6mm; Described hole 41 is 80～120/cm
2
Fig. 6 has shown that it is the coefficient of heat transfer comparison diagram of the general heat-transfer pipe (dark strokes) of smooth flat with the bottom surface, hole that the bottom surface, hole offers the heat-transfer pipe of the netted conduit of V-arrangement (light lines), internal diameter of tube body: 16.8mm, thickness of pipe wall (not comprising fin): 0.6mm, fin height: 0.7mm, pipe range: 2400mm, " V " shape groove depth: 0.06mm, node: 35/week, 45/week of conduit, conduit height: 0.07mm, 100/cm of hole
2Cold-producing medium is HFC-134a (CH2FCF3 is commonly called as R134a).Reading among Fig. 6 such as following table:
| Current (m/s) | The heat exchanger tube coefficient of heat transfer (W/m of the present invention 2K) | The general heat-transfer pipe coefficient of heat transfer (W/m 2K) | Optimized proportion of the present invention |
| 1.4 | 5100 | 4700 | 8.5％ |
| 1.8 | 5950 | 5550 | 7.2％ |
| 2.25 | 6700 | 6100 | 9.8％ |
| 2.5 | 7250 | 6500 | 11.5％ |
| 3 | 7950 | 7100 | 12％ |
Shown process of the present invention referring to Fig. 5 I, 5II,
Corresponding diagram (a) cuts out groove 20 at the outer surface of body 1 along the hand of spiral, residue boss 22 between the adjacent grooves 20;
Corresponding diagram (b) rolls out spiral helicine first conduit 51 with knurling tool at the bottom land of groove 20;
Corresponding diagram (c) cuts out second conduit, 52, the first conduits 51 and second conduit, the 52 crossing netted grooves that form with blade at the bottom land of groove 20; Cut out breach 23 with blade at the end face of boss 22;
Corresponding diagram (d) rolls boss 22, makes boss 22 to circumferential extension, forms the fin 2 and the hole 21 of moulding.Can also cut hole 41 shown in Figure 2 at the top of fin 2 afterwards and carry out the annular knurl processing, process heat-transfer pipe profile shown in Figure 2 at the top of fin 2.
Claims (10)
1, a kind of heat transfer tube for evaporator, comprise body (1) with inner chamber, be arranged on the fin (2) axial in spiral distribution on body (1) outer peripheral face along body (1), the sidewall of described fin (2) from the bottom of fin (2) to the top outer inclination towards fin (2), form the hole (21) of opening (211) sectional area between the adjacent fins (2) less than floor space, it is characterized in that: second conduit (52) that also offers first conduit (51) on the bottom surface of described hole (21) and intersect with described first conduit (51), a kind of at least the first conduit (51) or second conduit (52) is many, and first conduit (51) has a plurality of crossing nodes (5) with second conduit (52).
2, heat transfer tube for evaporator according to claim 1 is characterized in that: described first conduit (51) is axially in spiral distribution along body (1), and described second conduit (52) is many of intersecting vertically with first conduit (51).
3, according to claim 1 or 2 described heat transfer tube for evaporator, it is characterized in that: described first conduit (51) and second conduit (52) are " V " shape groove.
4, heat transfer tube for evaporator according to claim 3 is characterized in that: the degree of depth of described first conduit (51) and second conduit (52) is 0.02～0.1mm.
5, heat transfer tube for evaporator according to claim 3 is characterized in that: described node (5) is 30～50/week.
6,, according to claim 1 or 2 described heat transfer tube for evaporator, it is characterized in that: described first conduit (51) and second conduit (52) be the top the big end little dovetail groove.
7, heat transfer tube for evaporator according to claim 1 is characterized in that: also offer along the conduit (3) of the profile of tooth axial in spiral distribution of body (1) on described body (1) inner peripheral surface.
8, heat transfer tube for evaporator according to claim 7 is characterized in that: described conduit (3) is 1～60/week, and the height of described conduit (3) is 0.1～0.6mm.
9, heat transfer tube for evaporator according to claim 1 is characterized in that: the top of described fin (2) also offers a plurality of holes (41) that intersect with described opening (211), and described hole (41) is 80～120/cm
2
10, a kind of manufacture method of heat transfer tube for evaporator as claimed in claim 1 comprises the steps:
At first, cut out groove along the hand of spiral, remain boss between the adjacent grooves at the outer surface of body (1);
Secondly, the end face at boss cuts out breach;
Once more, boss is rolled, makes boss, form the fin (2) of moulding to circumferential extension,
It is characterized in that: after the outer surface of body (1) cut out groove, also the bottom land at groove cut described crossing first conduit (51) and second conduit (52).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101366255A CN101458048A (en) | 2008-12-19 | 2008-12-19 | Heat transfer tube for evaporator and method of manufacturing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101366255A CN101458048A (en) | 2008-12-19 | 2008-12-19 | Heat transfer tube for evaporator and method of manufacturing same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101458048A true CN101458048A (en) | 2009-06-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101366255A Pending CN101458048A (en) | 2008-12-19 | 2008-12-19 | Heat transfer tube for evaporator and method of manufacturing same |
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| CN (1) | CN101458048A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107560479A (en) * | 2017-09-04 | 2018-01-09 | 珠海格力电器股份有限公司 | Heat exchange tube and heat exchanger with same |
| CN107883801A (en) * | 2017-11-02 | 2018-04-06 | 珠海格力电器股份有限公司 | Flat heat exchange tube and microchannel heat exchanger |
| CN109269337A (en) * | 2018-11-12 | 2019-01-25 | 烟台恒辉铜业有限公司 | A kind of flooded evaporator heat exchanger tube |
| CN109307389A (en) * | 2018-11-20 | 2019-02-05 | 烟台恒辉铜业有限公司 | A kind of new-type full-liquid type evaporating heat-exchanging pipe |
-
2008
- 2008-12-19 CN CNA2008101366255A patent/CN101458048A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107560479A (en) * | 2017-09-04 | 2018-01-09 | 珠海格力电器股份有限公司 | Heat exchange tube and heat exchanger with same |
| CN107883801A (en) * | 2017-11-02 | 2018-04-06 | 珠海格力电器股份有限公司 | Flat heat exchange tube and microchannel heat exchanger |
| CN109269337A (en) * | 2018-11-12 | 2019-01-25 | 烟台恒辉铜业有限公司 | A kind of flooded evaporator heat exchanger tube |
| CN109269337B (en) * | 2018-11-12 | 2024-01-26 | 山东恒辉节能技术集团有限公司 | Heat exchange tube for flooded evaporator |
| CN109307389A (en) * | 2018-11-20 | 2019-02-05 | 烟台恒辉铜业有限公司 | A kind of new-type full-liquid type evaporating heat-exchanging pipe |
| CN109307389B (en) * | 2018-11-20 | 2023-07-07 | 山东恒辉节能技术集团有限公司 | Novel flooded evaporation heat exchange tube |
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Open date: 20090617 |