CN203037130U - Falling film evaporation heat exchanging pipe - Google Patents
Falling film evaporation heat exchanging pipe Download PDFInfo
- Publication number
- CN203037130U CN203037130U CN 201220710333 CN201220710333U CN203037130U CN 203037130 U CN203037130 U CN 203037130U CN 201220710333 CN201220710333 CN 201220710333 CN 201220710333 U CN201220710333 U CN 201220710333U CN 203037130 U CN203037130 U CN 203037130U
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- Prior art keywords
- falling film
- heat exchanger
- film evaporation
- evaporation heat
- cavity
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- Expired - Fee Related
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Abstract
The utility model discloses a falling film evaporation heat exchanging pipe which comprises a pipe body and a cavity, wherein the pipe body is provided with a central pipe cavity, the cavity is formed in the pipe body, a plurality of small holes which are communicated with the cavity are formed in the outer surface of the pipe body, and a micro groove channel which is in a latticed shape is further formed in the outer surface of the pipe body. When the falling film evaporation heat exchanging pipe works, liquid on the heat exchanging pipe is distributed uniformly, and therefore the falling film evaporation heat exchanging pipe has the advantages of being large in heat exchanging area and good in heat exchanging effect.
Description
Technical field
The utility model relates to a kind of falling film evaporation heat exchanger tube.
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 height to a great extent.
Heat exchanger tube has the body of band inner chamber, common inboard wall of tube body smooth surface, and perhaps inner wall surface is axially arranged with the conduit of shape distribution in the shape of a spiral along body, in order to improve the coefficient of heat transfer of hot fluid in the heat exchanger tube.Outer surface of tube body is smooth surface or the surface with special construction.Described special construction is: the outer surface of tube body aperture that gathers, these apertures and following cavity phase communications and liaison, cavity be located at body inner and along body axially in the shape of a spiral shape distribute.
In the falling film evaporator course of work, the spray equipment that arranges in the falling film evaporator with liquid from the heat-exchanging tube bundle top or the periphery spray to heat exchanger tube, form liquid film at heat exchange pipe external surface.Hot fluid flows through from the central lumen of heat exchanger tube, carries out heat exchange with the outer liquid of pipe when flowing, manage evaporate behind the outer heated liquid, boiling phenomenon generation steam, take 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 is up to the bottom of tube bank one row's heat exchanger tube.
But there is following problem in above-mentioned falling film evaporator: the mouth spray on the liquid distributor of falling film evaporator is dispersed placement, thereby the liquid that sprays also disperses, and the liquid distribution on heat exchanger tube surface is inhomogeneous.Because heat exchange pipe external surface is smooth and has the flat surface of aperture, in the place that liquid sprays, most of liquid can flow directly in the cavity in the body by aperture, and can not spread out along the body axial flow rapidly, causes liquid distribution inhomogeneous on heat exchanger tube surface.The partially liq that flows into cavity can not in time all flash to gas, and partially liq can drop onto following pipe row.The liquid that drops onto the next stage heat exchanger tube can heavily be covered with again states phenomenon, before not having moistening diffusion vertically, can continue again circumferentially to drip to the next stage heat exchanger tube along pipe.So, cause liquid in the heat exchanger tube surface distributed inhomogeneous and below the part cavity in the liquid interference, make heat exchange surface liquid film thickening, reduced the heat exchange effect, and lack liquid in part surface and the following cavity, even occur drying up, can not carry out heat exchange.According to heat transfer theory, the heat transfer resistance size depends primarily on thickness of liquid film in the Evaporation Phenomenon.Liquid film is more thin, and thermal resistance is more little, and the heat exchange effect is more good.Thereby can the liquid on 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: at the deficiency of transmission heat exchanger tube, provide that a kind of heat exchange area is bigger, the more uniform falling film evaporation heat exchanger tube of liquid distribution.
The technical solution of the utility model is: described falling film evaporation heat exchanger tube, comprise the body that has central lumen and be located at the interior cavity of this body, the outer surface of described body is provided with a plurality of apertures that are connected with described cavity, also is provided with latticed micro-channel at the outer surface of described body.
As preferably, each grid cell of described micro-channel all is quadrangle.Further preferred, each grid cell of micro-channel all is square.
As preferably, the density of the grid cell of described micro-channel is 17 ~ 100 every square centimeter.
As preferably, the degree of depth of described micro-channel is 0.1 ~ 0.3mm.
As preferably, described cavity in described body along body axially in the shape of a spiral shape distribute.Further preferred, the height of cavity is 0.4 ~ 0.7mm, and width is 0.3 ~ 0.6mm.
As preferably, the aperture of described aperture is 0.1 ~ 0.3mm.
As preferably, the aperture of described aperture is arranged on the bottom land place of described micro-channel.
As preferably, the inner surface of described body is provided with 10 ~ 60 spiral conduits, and the degree of depth of conduit is 0.1 ~ 0.5mm.
The utility model has the advantages that: heat exchanger tube of the present utility model is when work, the liquid of spray to the heat exchanger tube body, part flows in the cavity by the aperture on surface, some liquid can flow vertically by micro-channel, moistening not by the body surface of spray to liquid rapidly, flow in the cavity along the logical small holes of journey, make the body surface and the following cavity that are not sprayed by liquid obtain replenishing of liquid, avoided the generation of dry-out.Thereby the thickness of liquid film on lightening holes surface, moistening dry surface, the thickness of liquid film of uniform heat exchange tube-surface, and then improved the surface evaporation coefficient of heat transfer of falling liquid film heat exchanger tube.
Description of drawings
Fig. 1 is the sectional structure schematic diagram of the utility model embodiment;
Fig. 2 is the perspective view after A place part is amplified among Fig. 1;
Wherein: 1-body, 2-aperture, 3-micro-channel, 4-cavity, 5-conduit.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the utility model, should understand these embodiment only is used for explanation the utility model and is not used in restriction scope of the present utility model, after having read the utility model, those skilled in the art all fall within the application's claims institute restricted portion to the modification of the various equivalent form of values of the present utility model.
Embodiment: as shown in Figure 1, the falling film evaporation heat exchanger tube of present embodiment comprises the body 1 that has central lumen, and the body two ends are the light section, and the effect of light section is: pass the both sides end plate of shell and tube exchanger when heat exchanger tube after, and can be closely fixing with end plate.Be provided with in the described body 1 along the axial cavity 4 that distributes of shape in the shape of a spiral of body, it highly is 0.4 ~ 0.7mm, width be 0.3 ~ 0.6mm(wherein, highly refer to the length of cavity above-below direction in Fig. 1, width is the length of cavity left and right directions in Fig. 1).The outer surface of body 1 is provided with a plurality of apertures 2 that are connected with described cavity 4.
In the present embodiment, also be provided with latticed micro-channel 3 at the outer surface of described body 1.So, when work, spray the liquid on the heat exchanger tube body 1, partially liq can flow in the cavity 4 by the aperture 2 on surface, and some liquid can flow vertically by micro-channel, and is moistening not by the body surface of spray to liquid rapidly, flows in the cavity 4 along the logical small holes 2 of journey.Make the body surface and the following cavity 4 that are not sprayed by liquid obtain replenishing of liquid, avoided the appearance of dry-out.Also play the effect of uniform heat exchange tube-surface liquid distribution simultaneously, thereby reached the purpose that improves evaporation heat transfer coefficient.
Discover, when each grid cell of described micro-channel 3 all be quadrangle particularly the density of square structure, grid cell be that the degree of depth of 17 ~ 100 every square centimeter (being to be distributed with 17 ~ 100 grid cells on the area on per 1 plane centimetre), micro-channel is when being 0.1 ~ 0.3mm, spray is best along the flow effect of micro-channel 3 to the liquid on the body 1, and is moistening not by the body surface of spray to liquid with prestissimo.
In addition, can flow into smoothly in the cavity 4 in order to make partially liq, so that cavity obtains replenishing of liquid, this example is special to be arranged on the bottom land place of described micro-channel 3 with each aperture 2 apertures, and the aperture of also finding to work as described aperture 2 is 0.1 ~ 0.3mm.
In addition, present embodiment also is provided with 10 ~ 60 conduits 5 spiral, that the degree of depth is 0.1 ~ 0.5mm at the inner surface of described body 1, and flowing in 5 pairs of pipes of these conduits can be played the effect that destroys the boundary layer, has improved the convection transfer rate in the pipe.Conduit 5 in the pipe and outer micro-channel 3 actings in conjunction of pipe have reached the effect of enhanced heat exchange.
Now that the preparation method brief introduction of this heat exchanger tube is as follows: at first the outer surface at common body processes several fins that radially extend, depress by cutter in fin top then, thereby the flat distortion of fin roof pressure is formed cavity 4, and formation smooth outer surface, offer simultaneously aperture 2 on the surface, 4 of cavitys are connected with the external world by this aperture 2.
Claims (10)
1. falling film evaporation heat exchanger tube, comprise the body (1) that has central lumen and be located at the interior cavity (4) of this body (1), the outer surface of described body (1) is provided with a plurality of apertures (2) that are connected with described cavity (4), it is characterized in that: the outer surface at described body (1) also is provided with latticed micro-channel (3).
2. falling film evaporation heat exchanger tube according to claim 1, it is characterized in that: each grid cell of described micro-channel (3) all is quadrangle.
3. falling film evaporation heat exchanger tube according to claim 2 is characterized in that: each grid cell of described micro-channel (3) all is square.
4. falling film evaporation heat exchanger tube according to claim 3, it is characterized in that: the density of the grid cell of described micro-channel (3) is 17 ~ 100 every square centimeter.
5. according to claim 1 or 2 or 3 or 4 described falling film evaporation heat exchanger tubes, it is characterized in that: the degree of depth of described micro-channel (3) is 0.1 ~ 0.3mm.
6. according to claim 1 or 2 or 3 or 4 described falling film evaporation heat exchanger tubes, it is characterized in that: described cavity (4) in described body (1) along body axially in the shape of a spiral shape distribute.
7. falling film evaporation heat exchanger tube according to claim 6, it is characterized in that: the height of described cavity (4) is 0.4 ~ 0.7mm, width is 0.3 ~ 0.6mm.
8. according to claim 1 or 2 or 3 or 4 described falling film evaporation heat exchanger tubes, it is characterized in that: the aperture of described aperture (2) is 0.1 ~ 0.3mm.
9. according to claim 1 or 2 or 3 or 4 described falling film evaporation heat exchanger tubes, it is characterized in that: the aperture of described aperture (2) is arranged on the bottom land place of described micro-channel (3).
10. according to claim 1 or 2 or 3 or 4 described falling film evaporation heat exchanger tubes, it is characterized in that: the inner surface of described body (1) is provided with 10 ~ 60 spiral conduits (5), and the degree of depth of conduit (5) is 0.1 ~ 0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220710333 CN203037130U (en) | 2012-12-20 | 2012-12-20 | Falling film evaporation heat exchanging pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220710333 CN203037130U (en) | 2012-12-20 | 2012-12-20 | Falling film evaporation heat exchanging pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203037130U true CN203037130U (en) | 2013-07-03 |
Family
ID=48689245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220710333 Expired - Fee Related CN203037130U (en) | 2012-12-20 | 2012-12-20 | Falling film evaporation heat exchanging pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203037130U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047891A (en) * | 2012-12-20 | 2013-04-17 | 苏州新太铜高效管有限公司 | Falling film evaporating pipe with netlike outer surface |
| CN103388995A (en) * | 2013-08-07 | 2013-11-13 | 同方安装工程科技（江苏）股份有限公司 | Liquid film evaporation heat exchanger with vertical arrow-tail micro structures |
-
2012
- 2012-12-20 CN CN 201220710333 patent/CN203037130U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047891A (en) * | 2012-12-20 | 2013-04-17 | 苏州新太铜高效管有限公司 | Falling film evaporating pipe with netlike outer surface |
| CN103047891B (en) * | 2012-12-20 | 2014-11-05 | 苏州新太铜高效管有限公司 | Falling film evaporating pipe with netlike outer surface |
| CN103388995A (en) * | 2013-08-07 | 2013-11-13 | 同方安装工程科技（江苏）股份有限公司 | Liquid film evaporation heat exchanger with vertical arrow-tail micro structures |
| CN103388995B (en) * | 2013-08-07 | 2015-07-01 | 同方安装工程科技（江苏）股份有限公司 | Liquid film evaporation heat exchanger with vertical arrow-tail micro structures |
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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: 20130703 Termination date: 20201220 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |