CN202582322U - Falling film evaporation heat exchange tube provided with axial spiral slots on outer surface - Google Patents
Falling film evaporation heat exchange tube provided with axial spiral slots on outer surface Download PDFInfo
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- CN202582322U CN202582322U CN 201220204586 CN201220204586U CN202582322U CN 202582322 U CN202582322 U CN 202582322U CN 201220204586 CN201220204586 CN 201220204586 CN 201220204586 U CN201220204586 U CN 201220204586U CN 202582322 U CN202582322 U CN 202582322U
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- heat exchange
- heat exchanger
- exchanger tube
- exchange tube
- falling film
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Abstract
The utility model discloses a falling film evaporation heat exchange tube provided with axial spiral slots on the outer surface. The falling film evaporation heat exchange tube comprises a heat exchange tube body, axial spiral slots arranged on the inner surface of the heat exchange tube body, a T-shaped structure arranged on the outer surface of the heat exchange tube body, and cavities and narrow slots. The falling film evaporation heat exchange tube is characterized in that the one to three axial spiral slots are arranged on the outer surface of the heat exchange tube body and stretch across all the cavities and narrow slots of the heat exchange tube body. According to the falling film evaporation heat exchange tube provided with the axial spiral slots on the outer surface, the boiling heat exchange coefficient is increased by using the structure of the T-shaped structure, and further the integral heat exchange coefficient of the falling film evaporation heat change tube is increased; and the axial slots are arranged on the surface, and excessive liquid in a local part is driven by using a capillary pressure difference to flow the local part with little liquid, so that the uniformity of a liquid film distributed on the surface of the heat exchange tube can be improved. In addition, the slots in the heat exchange tube can play a role in damaging a boundary layer for the flowing in the heat exchange tube, so that the function of heat transfer enhancement is achieved.
Description
Technical field
the utility model relates to a kind of falling film evaporation heat exchanger tube, and especially a kind of outer surface has the falling film evaporation heat exchanger tube of axial screw shape conduit.
Background technology
falling film evaporator is the visual plant in many industrial processes, for example, and the falling film evaporator in the central air conditioner system handpiece Water Chilling Units.The quality of falling film evaporator performance depends on the exchange performance quality to a great extent.
heat exchanger tube has the body of inner chamber, and inboard wall of tube body smooth surface or inner wall surface are axially arranged with the conduit of shape distribution in the shape of a spiral along body usually; Outer surface of tube body is smooth surface or has the fin that distributes along the axial shape in the shape of a spiral of body, through on fin, processing, fin top is flattened, and the fin bottom is indeformable basically, thereby cavity formed at the bottom between the adjacent fins; And, narrow down promptly so-called T type structure thereby cause cavity to export because fin top is crushed.This cavity structure distributes in the circumferential spirality of heat exchanger tube.
in the falling film evaporator course of work, the spray equipment that is provided with in the falling film evaporator sprays liquid on the heat exchanger tube from heat-exchanging tube bundle top or periphery, forms liquid film at heat exchange pipe external surface.Hot fluid flows through in heat exchanger tube, carries out heat exchange with the outer liquid of pipe when flowing, and manages the generation steam that evaporates, seethes with excitement behind the outer heated liquid, takes away the energy of tube fluid.In falling film evaporator; Often many heat exchanger tubes are arranged in horizontal tube bundle, and the heat exchanger tube that the liquid of part spray is restrained top is heated into steam, has little time evaporated liquid and flows downward; Flow to following tube surface and be heated, wherein partially liq continues to form steam; Remaining liq continues to flow downward, and is still formed steam by following pipe heating and partially liq.This phenomenon continuity, one row's heat exchanger tube up to the bottom of tube bank.
There is following problem in
still above-mentioned falling film evaporator: the liquid that is sprayed in the falling film evaporator disperses, and it is uneven often distributing when spraying the heat exchanger tube surface.Because heat exchange pipe external surface is a flat surface smooth, that have the cavity narrow slit, when Where topical liquid is too much, can flow into cavity through the cavity narrow slit; Can not flow vertically rapidly; And all evaporations in time of this part liquid, partially liq can drop onto following pipe row along cavity; The liquid that drops onto the next stage heat exchanger tube is not before having moistening diffusion vertically; Can continue again circumferentially to drip to the next stage heat exchanger tube along pipe; Cause liquid inhomogeneous, make heat exchanger tube local surfaces liquid film thickening, reduced the heat exchange effect in the heat exchanger tube surface distributed; And drying up appears in part surface, can not carry out heat exchange.According to heat transfer theory, can the liquid on falling film evaporation heat exchanger tube surface be evenly distributed, and the heat exchange influential effect of exchange heat pipe is very big, becomes the key that improves falling liquid film heat exchanger tube heat exchange effect.
The utility model content
the utility model purpose is: a kind of heat exchange area that can increase heat exchanger tube is provided; It is not enough simultaneously can to overcome the heat exchange pipe external surface wettability again; Make liquid on heat exchanger tube, be more evenly distributed, heat exchange is the falling film type evaporation pipe more fully.
The technical scheme of
the utility model is: a kind of outer surface has the falling film evaporation heat exchanger tube of axial screw shape conduit; Comprise: the conduit of heat exchanger tube body, heat exchanger tube inner surface; The T type structure on the outer surface and the cavity and the narrow slit of formation; It is characterized in that also be provided with some annular channels on the said heat exchange pipe external surface, said annular channel is across all cavitys and the narrow slit of heat exchanger tube.
during axial groove, the pressure of cutter makes and forms the fin top distortion boss and also extend to hole narrow slit top outside processing tube; Across hole outlet narrow slit; Form the passage of top, hole, when liquid passes through, can be with liquid transport to dry zone.
are further, and said annular channel can be designed to some the spirality conduits that are connected.
are further, and said annular channel and heat exchanger tube axis angle are 10 degree ~ 50 degree.
Further, said annular channel
Width is 0.2 ~ 0.6mm, and the degree of depth is 0.2 ~ 0.5mm.
are further, and the cavity of the T type cavity structure of said heat exchange pipe external surface circumferentially extends along heat exchanger tube, and said cavity depth is 0.4 ~ 0.7mm, width 0.3 ~ 0.5mm; The slit width on said cavity top is 0.1 ~ 0.3mm.
are further, and the number of the conduit of said heat exchanger tube inner surface is 10 ~ 50, and groove depth is 0.1 ~ 0.4mm.
The operation principle of the utility model:
spray liquid on the heat exchanger tube along pipe circumferentially downwards before the drippage; Partially liq can be under capillary force differential pressure action or gravity effect that axial slot produces; Rapidly along the axial moistening heat exchange surface of heat exchanger tube; Flow into cavity through the cavity narrow slit, make not by liquid spraying to surface cavities obtain replenishing of liquid, thereby evaporate and seethe with excitement.According to Hydrodynamics Theory, liquid forms meniscus in the capillary conduit, and liquid internal pressure power is relevant with the radius of curvature of meniscus.When the meniscus radius of curvature was big, the pressure in the liquid was high; Otherwise, meniscus radius of curvature hour, the pressure in the liquid is low.And the amount of fluid in the conduit is when big, and the liquid meniscus radius of curvature is just big; Otherwise it is just little.Therefore under the capillary differential pressure action, the liquid in the conduit forever from the part many place to the few place migration of amount of liquid.So; When heat exchanger tube surface liquid skewness, the place that localized liquid is many is under the promotion of capillary pressure reduction; Make liquid vertically conduit flow to the few zone of liquid; Reach the equally distributed purpose of liquid, avoid dry-out to occur, thereby reached the purpose that improves evaporation heat transfer coefficient.
secondly, in falling film evaporator, when liquid spraying during to the heat exchanger tube surface, often Evaporation Phenomenon and boiling phenomenon exist simultaneously.In flooded evaporator; Experiment has proved that the T type structure on surface can significantly improve the coefficient of heat transfer, and under the spray condition, when being full of liquid in the cavity; Situation and flooded evaporator are similar, and the T type structure on heat exchanger tube surface can improve boiling heat transfer coefficient.After the partially liq of spray gets into cavity from the aperture on surface, be easy to generate bubble in corner areas, simultaneously; Bubble in the growth course, closely contacts with three walls of cavity in cavity, has increased bubble is conducted heat; Improve the speed of growth of bubble, strengthened the boiling heat transfer effect greatly.
Under the conduit effect, liquid boundary layer and temperature boundary layer near the wall are destroyed fluid in
pipe, can improve the coefficient of heat transfer of tube fluid in pipe.
The utility model has the advantages that:
The falling film evaporation heat exchanger tube that
the utility model outer surface has axial screw shape conduit is with T type body structure surface; Improved boiling heat transfer coefficient; And then improved the whole coefficient of heat transfer of falling liquid film heat exchanger tube, the surface is provided with axial slot simultaneously, utilizes capillary pressure reduction; Order about the many few parts of flow direction liquid of localized liquid, can improve the uniformity coefficient of the liquid film distribution on heat exchanger tube surface.In addition, the conduit in the heat exchanger tube can play the effect that destroys the boundary layer to flowing in managing, and reaches the effect of enhanced heat exchange.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is further described:
Fig. 1 has the structural representation of the falling film evaporation heat exchanger tube of axial screw shape conduit for the utility model outer surface;
wherein: 1, heat exchange tube body light pipe section, 2, cavity, 3, the narrow slit of cavity outlet, 4, axial screw shape conduit, 5, the inner surface conduit.
The specific embodiment
further specify such scheme below in conjunction with specific embodiment.Should be understood that these embodiment are used to the utility model is described and the scope that is not limited to limit the utility model.The implementation condition that adopts among the embodiment can be done further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in the normal experiment.
Embodiment:
It is as shown in Figure 1,A kind of
Outer surface has the falling film evaporation heat exchanger tube of axial screw shape conduit.Its two ends are heat exchange tube body light pipe section 1, and its effect is after heat exchanger tube passes the both sides end plate of shell and tube exchanger, can be closely fixing with end plate.The groove width 0.6mm of outer surface axial screw shape conduit 4, the degree of depth is 0.5mm, and 1 of quantity, its helical angle are 20 degree (with axis angle), and its pitch is 15mm.Cavity 2 width that T type structure forms are 0.3mm, highly are 0.6mm; The exit width of the narrow slit 3 of cavity outlet is 0.2mm, and every meter has 2000 cavitys 2 on the heat exchange tube body.The number of the inner surface conduit 5 of heat exchanger tube is 35, and the degree of depth is 0.3mm.
above advantage that shows and described basic principle, principal character and the utility model of the utility model.The technical staff of the industry should understand; The utility model is not restricted to the described embodiments; The principle of describing in the foregoing description and the specification that the utility model just is described; The utility model also has various changes and modifications under the prerequisite that does not break away from the utility model spirit and scope, and these variations and improvement all fall in the utility model scope that requires protection.
Claims (6)
1. an outer surface has the falling film evaporation heat exchanger tube of axial screw shape conduit; Comprise: the conduit of heat exchanger tube body, heat exchanger tube inner surface; The T type structure on the outer surface and the cavity and the narrow slit of formation; It is characterized in that also be provided with some annular channels on the said heat exchange pipe external surface, said annular channel is across all cavitys and the narrow slit of heat exchanger tube.
2. outer surface according to claim 1 has the falling film evaporation heat exchanger tube of axial screw shape conduit, and said annular channel can be designed to some the spirality conduits that are connected.
3. outer surface according to claim 1 has the falling film evaporation heat exchanger tube of axial screw shape conduit, it is characterized in that, said annular channel and heat exchanger tube axis angle are 10 degree ~ 50 degree.
4. outer surface according to claim 1 has the falling film evaporation heat exchanger tube of axial screw shape conduit, it is characterized in that, the width of said annular channel is 0.2 ~ 0.6mm, and the degree of depth is 0.2 ~ 0.5mm.
5. outer surface according to claim 1 has the falling film evaporation heat exchanger tube of axial screw shape conduit; It is characterized in that; The cavity of the T type cavity structure of said heat exchange pipe external surface circumferentially extends along heat exchanger tube, and said cavity depth is 0.4 ~ 0.7mm, width 0.3 ~ 0.5mm; The slit width on said cavity top is 0.1 ~ 0.3mm.
6. outer surface according to claim 1 has the falling film evaporation heat exchanger tube of axial screw shape conduit, it is characterized in that, the number of the conduit of said heat exchanger tube inner surface is 10 ~ 50, and groove depth is 0.1 ~ 0.4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220204586 CN202582322U (en) | 2012-05-09 | 2012-05-09 | Falling film evaporation heat exchange tube provided with axial spiral slots on outer surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220204586 CN202582322U (en) | 2012-05-09 | 2012-05-09 | Falling film evaporation heat exchange tube provided with axial spiral slots on outer surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202582322U true CN202582322U (en) | 2012-12-05 |
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ID=47251725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220204586 Expired - Fee Related CN202582322U (en) | 2012-05-09 | 2012-05-09 | Falling film evaporation heat exchange tube provided with axial spiral slots on outer surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202582322U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636067A (en) * | 2012-05-09 | 2012-08-15 | 苏州新太铜高效管有限公司 | Falling film evaporation heat exchanging pipe with axial spiral channels arranged on outer surface |
| CN105066761A (en) * | 2015-09-22 | 2015-11-18 | 烟台恒辉铜业有限公司 | Evaporating pipe with narrow-gap steam exhaust opening |
-
2012
- 2012-05-09 CN CN 201220204586 patent/CN202582322U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636067A (en) * | 2012-05-09 | 2012-08-15 | 苏州新太铜高效管有限公司 | Falling film evaporation heat exchanging pipe with axial spiral channels arranged on outer surface |
| CN105066761A (en) * | 2015-09-22 | 2015-11-18 | 烟台恒辉铜业有限公司 | Evaporating pipe with narrow-gap steam exhaust opening |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20200509 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |