CN207832009U - A kind of heat-exchange tube and heat exchanger - Google Patents
A kind of heat-exchange tube and heat exchanger Download PDFInfo
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- CN207832009U CN207832009U CN201721887593.3U CN201721887593U CN207832009U CN 207832009 U CN207832009 U CN 207832009U CN 201721887593 U CN201721887593 U CN 201721887593U CN 207832009 U CN207832009 U CN 207832009U
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Abstract
The utility model is related to field of heat exchange equipment, a kind of heat-exchange tube and heat exchanger are disclosed.Heat-exchange tube includes the tube wall that material is silicon carbide ceramics.There is tube wall internal face and outside wall surface, internal face to be provided with internal channel, and internal channel extends along the length direction of heat-exchange tube.The heat exchanger of the utility model includes the heat-exchange tube.When the internal face of heat-exchange tube is provided with internal channel, film condenses the liquid film to be formed and can be flowed in internal channel under the surface tension effects of itself so that the liquid film on heat-transfer surface outside internal channel is thinned, and considerably increases heat transfer efficiency in this way.And internal channel extends on the length direction of heat-exchange tube so that liquid in internal channel can drain along interior raceway groove flowing in time, be unlikely to accumulate excessive condensate liquid and the thinned effect that influences liquid film on the heat-transfer surface outside heat-transfer effect and internal groove.
Description
Technical field
The utility model is related to field of heat exchange equipment, in particular to a kind of heat-exchange tube and heat exchanger.
Background technology
Heat-exchange tube is the critical component of heat exchanger, and most heat exchangers of commercial Application are all made of metal fever at present
Exchange pipe.Its heat conductivity is good, but corrosion resistance is poor, is easy fouling, and temperature in use is not high.Present chemical environment is most
In the presence of corrosive conditions such as acid or alkali, under these operating modes, metallic heat exchanger tube is that use is restricted.To meet heat exchange
Demand has developed glass, ceramics, Fluorine-lined heat exchanger tube, but these substitutes all there are problems that：It cannot be extensively using all
Soda acid operating mode, thermal conductivity it is low.
Silicon carbide ceramics has outstanding high temperature resistant and corrosion resistance, it can long-time work at relatively high temperatures
Make in oxidation and aggressive atmosphere and strong acid-base.The thermal coefficient of silicon carbide ceramics is up to 140~180W/ (mk), is approximately
Twice of metal tantalum, 5 times of stainless steel, 50 times of PTFE.But the existing heat-exchange tube made of silicon carbide ceramics, heat exchange
Efficiency is still not high enough.
Utility model content
The purpose of this utility model is to provide a kind of heat-exchange tubes, have higher heat exchange efficiency.
The another object of the utility model is to provide a kind of heat exchanger comprising the utility model proposes heat exchange
Pipe, has higher heat exchange efficiency.
What the embodiments of the present invention were realized in：
A kind of heat-exchange tube comprising the material of tube wall, tube wall is silicon carbide ceramics；Tube wall has internal face and outer wall
Face, internal face are provided with internal channel, and internal channel extends along the length direction of heat-exchange tube.
In a kind of embodiment of the utility model：
The extending direction of internal channel is consistent with the axis direction of heat-exchange tube.
In a kind of embodiment of the utility model：
Two or more internal channels, circumferentially-spaced arrangement of each internal channel in internal face are provided on internal face.
In a kind of embodiment of the utility model：
The both ends of internal channel are through to the end face at heat-exchange tube both ends.
In a kind of embodiment of the utility model：
Protrusion is provided in internal channel.
In a kind of embodiment of the utility model：
Outside wall surface is provided with outer channel.
In a kind of embodiment of the utility model：
The depth of internal channel is the 1/8~1/4 of pipe thickness.
In a kind of embodiment of the utility model：
The width of internal channel is less than the thickness of tube wall.
In a kind of embodiment of the utility model：
The internal diameter of heat-exchange tube is 8-60mm.
A kind of heat exchanger provided by the utility model comprising above-mentioned heat-exchange tube.
The advantageous effect of the utility model embodiment is：
The heat-exchange tube of the utility model comprising material is the tube wall of silicon carbide ceramics.Tube wall is with internal face and outside
Wall surface, internal face are provided with internal channel, and internal channel extends along the length direction of heat-exchange tube.Silicon carbide ceramics material has high
Heat conductivility.But when under normal circumstances, needing heat transfer outward inside heat-exchange tube for high-temperature gas, steam medium can be thin
Film, which condenses, to be formed complete liquid film and is covered on internal face, and this liquid film thermal coefficient is often smaller, therefore seriously affects heat transfer, at
For the heat exchange restricted link of silicon carbide ceramics heat exchange pipe.When internal face is provided with internal channel, film condenses the liquid to be formed
Film can flow under the surface tension effects of itself in internal channel so that the liquid film on heat-transfer surface outside internal channel is thinned, in this way
Considerably increase heat transfer efficiency.And internal channel extends on the length direction of heat-exchange tube so that the liquid energy in internal channel
It is enough to drain in time along interior raceway groove flowing, it is unlikely to accumulate excessive condensate liquid and influences changing outside heat-transfer effect and internal groove
The thinned effect of liquid film on hot face.
The heat exchanger of the utility model is provided with above-mentioned heat-exchange tube, therefore advantageous effect having the same, herein not
It repeats again.
Description of the drawings
It, below will be to required use in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the axial schematic diagram of heat-exchange tube in the utility model embodiment 1；
Fig. 2 is the outside wall surface schematic diagram of heat-exchange tube in the utility model embodiment 1；
Fig. 3 is that view is unfolded in the internal face of heat-exchange tube in the utility model embodiment 1；
Fig. 4 is the structural schematic diagram of internal channel in the utility model another kind embodiment；
Fig. 5 is the sectional view of heat-exchange tube in the utility model embodiment 2；
Fig. 6 is the outside wall surface schematic diagram of heat-exchange tube in the utility model embodiment 2；
Fig. 7 is the distribution schematic diagram of the outer channel in the utility model another kind embodiment.
Icon：100- heat-exchange tubes；110- tube walls；Heat-transfer surface in 112-；120- internal channels；122- inner groove surfaces；124- is convex
It rises；130- outer channels.
Specific implementation mode
It is new below in conjunction with this practicality to keep the purpose, technical scheme and advantage of the utility model embodiment clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Usually here described in attached drawing and
The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiments of the present invention to providing in the accompanying drawings is not intended to limit requirement below
The scope of the utility model of protection, but it is merely representative of the selected embodiment of the utility model.Based in the utility model
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained without creative efforts, all
Belong to the range of the utility model protection.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.
In the description of the utility model embodiment, it should be noted that the orientation or position of the instructions such as term "inner", "outside"
Set relationship be based on the orientation or positional relationship shown in the drawings or the utility model product using when the orientation usually put
Or position relationship, be merely for convenience of describing the present invention and simplifying the description, do not indicate or imply the indicated device or
Element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as the limit to the utility model
System.
In the description of the utility model embodiment, it is also necessary to which explanation is unless specifically defined or limited otherwise, art
Language " setting ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally connect
It connects；It can be mechanical connection, can also be electrical connection；It can be directly connected, can also indirectly connected through an intermediary, it can
To be the connection inside two elements.For the ordinary skill in the art, it can understand above-mentioned term with concrete condition
Concrete meaning in the utility model embodiment.
Embodiment 1
Fig. 1 is the axial schematic diagram of heat-exchange tube 100 in the utility model embodiment 1；Fig. 2 is the utility model embodiment
The outside wall surface schematic diagram of heat-exchange tube 100 in 1.Referring to Fig.1 and 2, the present embodiment provides a kind of heat-exchange tube 100, packet
Include the tube wall 110 to form channel.Interior media flows in channel, and carries out heat exchange by tube wall 110 and external agency, because
The factors such as the temperature difference inside and outside the size of this heat-exchange surface, the material of tube wall 110, thickness and heat-exchange tube 100 are all by heat exchanging
Rate has an impact.It is high-temperature gas that the heat-exchange tube 100 of the present embodiment, which can be used for interior media, and external agency temperature is less than
The case where the case where interior media, i.e., heat transmits from inside to outside.
In the present embodiment, the material selection silicon carbide ceramics of tube wall 110 has outstanding high temperature resistant and corrosion resistance
Can, it can be worked long hours at relatively high temperatures in oxidation and aggressive atmosphere and strong acid-base.Silicon carbide ceramics
Thermal coefficient is up to 140~180W/ (mk), is approximately twice of metal tantalum, 5 times of stainless steel, 50 times of PTFE.Therefore it utilizes
Silicon carbide ceramics can theoretically promote the heat exchange efficiency of several times as Heat Conduction Material relative to traditional material.But existing use
The heat-exchange tube that silicon carbide ceramics makes, heat exchange efficiency are still not ideal enough.
Utility model people pass through the study found that it is existing using silicon carbide ceramics make heat-exchange tube, heat exchange efficiency according to
So dissatisfactory the reason is that, the steam of high temperature is when internal face is exchanged heat, the internal face of heat-exchange tube will appear membranaceous
Condensation, film condensation make internal face always be covered by one layer of complete film condensation, this layer of liquid film is internal high temperature gas and warm
The internal face for exchanging pipe separates.Therefore, after this layer of liquid film forming, steam condensation can only occur on liquid film surface.Therefore
The heat exchange efficiency of film condensation is relatively less than dropwise condensation.The heat that steam is released must can just be transmitted to tube wall by this layer of liquid film,
The liquid for condensing formation afterwards makes liquid film progressive additive.Because steam condensation is that the thermal resistance to phase transition of liquid is usually smaller, this
Layer liquid film often becomes the dominant thermal resistance of the inside and outside carry out heat exchange of heat-exchange tube.
Fig. 3 is that view is unfolded in the internal face of heat-exchange tube 100 in the utility model embodiment 1.Fig. 3 is please referred to, in order to subtract
The heat transfer that few film coagulation band comes hinders, and the present embodiment is reduced by the way that internal channel 120 is arranged in internal face on the heat-transfer surface of part
Thickness of liquid film, to improve heat exchange efficiency.Due to the presence of internal channel 120, internal face is divided into inner groove surface 122 and interior changes
Hot face 112.In the present embodiment, inner groove surface 122 is the wall surface being located in internal channel 120, and interior heat-transfer surface 112 is internal face except interior
Other wall surfaces other than groove face 122, liquid film on interior heat-transfer surface 112 because internal channel 120 there are due to be thinned.
Specifically, internal channel 120 along heat-exchange tube 100 length direction extend, and with the axis side of heat-exchange tube 100
To consistent.Two end faces of heat-exchange tube 100 are run through at the both ends of internal channel 120, therefore the coagulating liq in internal channel 120 can be with
It is circulated to the other end of heat-exchange tube 100 from one end of heat-exchange tube 100, therefore facilitates the timely row of extra coagulating liq
It walks.In the other embodiment of the utility model, the mode that internal channel 120 can also helically extend in internal face is arranged.
In the present embodiment, internal channel 120 is a continuous groove.Fig. 4 is in the utility model another kind embodiment
The structural schematic diagram of internal channel 120.Fig. 4 is referred to, in its another embodiment of the utility model, internal channel 120 can be disconnected
Continuous groove body is provided with protrusion 124, internal channel 120 is truncated into two sections or more in internal channel 120.In this case, increase
The surface area of internal face, that is, increase heat exchange area, therefore be more advantageous to heat dissipation.
Please continue to refer to Fig. 1, in the present embodiment, to process for convenience, the cross section profile of internal channel 120 is circular arc,
It in the other embodiment of the utility model, can be changed according to actual needs, for example internal channel 120 is set as trapezoidal
Slot, rectangular channel, inverted v-shaped groove etc..In the present embodiment, the junction circle of the inner groove surface 122 Yu interior heat-transfer surface 112 of internal channel 120
Angle keeps its smooth, and flowing is smooth.
In the embodiments of the present invention, in order to ensure that the self-strength and heat exchange efficiency of heat-exchange tube 100, heat are handed over
The internal diameter for changing pipe 100 should be 8~60mm, can within this range be selected according to actual conditions.It should be noted that internal diameter here
Subject to internal diameter within answering at heat-transfer surface 112.
120 quantity of internal channel of the utility model according to caliber and technology Calculation condition according to should be configured, if caliber
When greatly and the coefficient of heat transfer of needs is high, the quantity of groove can be increased.In the present embodiment, the internal face of heat-exchange tube 100 is set
It is equipped with 12 internal channels 120, circumferentially-spaced arrangement of the multiple internal channels 120 along internal face.In other implementations of the utility model
In example, the number of internal channel 120 can be increased and decreased according to actual conditions.
In order to have the effect of preferably being thinned liquid film, the width of internal channel 120 should be less than the thickness of tube wall 110.This
The thickness of place's tube wall 110 should be the thickness at interior heat-transfer surface 112, and the width of internal channel 120 is that 120 both sides of internal channel are changed with interior
The distance between the junction in hot face 112.In the case where not influencing product quality, the narrower 120 width of internal channel the better, gets over
The narrow effect that can more realize surface tension and liquid film is thinned.In the present embodiment, the width of internal channel 120 is 110 thickness of tube wall
0.8 times.
The depth of internal channel 120 has certain relationship with the quantity of internal channel 120.In the forming process of heat-exchange tube 100,
Heat-exchange tube 100 rigidity of itself cannot be influenced because internal channel 120 is too deep.If 120 bottom position of internal channel is too thin, rear
In the technical process in face, 100 surface of heat-exchange tube can be caused stomata occur because of shrinking, and thoroughly failed.Therefore in this reality
With in new embodiment, 120 depth of internal channel should be controlled the 1/8~1/4 of 110 thickness of tube wall, specific in this implementation, septal fossula
120 depth of slot is the 1/4 of 110 thickness of tube wall.This depth can be according to circumstances adjusted in above-mentioned range.
The present embodiment additionally provides a kind of heat exchanger (not shown), and heat exchanger tube uses the heat-exchange tube 100 of the present embodiment.
The operation principle of heat-exchange tube 100 is：
When internal high-temperature steam medium outwardly carries out conveying heat by tube wall 110, film occurs in internal face
Condensation forms liquid film.The formation of liquid film is the main reason for heat transfer effect of silicon carbide ceramic is still not ideal enough.And raceway groove
Presence the liquid of liquid film is flowed under the action of own face tension into internal channel 120.So that interior heat-transfer surface
Thinning of liquid film on 112 is to improve heat exchange efficiency.And the liquid subsequently condensed can also enter in internal channel 120, work as septal fossula
Fluid accumulation in slot 120 to a certain extent when, can drain along the flowing of internal channel 120, avoiding accumulating excessive liquid influences
Heat transfer.
Embodiment 2
Fig. 5 is the sectional view of heat-exchange tube 100 in the utility model embodiment 2；Fig. 6 is in the utility model embodiment 2
The outside wall surface schematic diagram of heat-exchange tube 100；Please refer to Fig. 5 and Fig. 6, heat-exchange tube 100 provided in this embodiment comprising formed
The tube wall 110 in channel.The tube wall 110 of the present embodiment selects thyrite to be made.The heat-exchange tube 100 of the present embodiment can
For interior media be high-temperature gas, external agency temperature be less than interior media the case where, i.e., heat transmits from inside to outside
Situation.
Substantially the same manner as Example 1, the heat-exchange tube 100 of the present embodiment in internal face by being arranged internal channel 120
The thickness of liquid film on the heat-transfer surface of part is reduced, to improving heat exchange efficiency.The difference is that the heat-exchange tube of the present embodiment
100 outside wall surface is additionally provided with outer channel 130.
Specifically, outer channel 130 along heat-exchange tube 100 length direction extend, and with the axis side of heat-exchange tube 100
To consistent.Unlike internal channel 120, not through two end faces of heat-exchange tube 100, this is at the both ends of outer channel 130
The both ends of heat-exchange tube 100 are sealed for convenience, can be easy to influence sealing effect if outer channel 130 is through end face.
In the present embodiment, the cross sectional shape of outer channel 130 is fan annular, and the plane where two side wall passes through heat-exchange tube 100
Axis, the groove bottom of outer channel 130 be cambered surface and with outside wall surface axial line having the same.In other embodiments, outer fissure
The cross sectional shape of slot 130 can also be the other shapes such as semicircle, rectangle, trapezoidal.
The effect of outer channel 130 is to increase the surface area of outside wall surface, that is, increases the heat-transfer surface in 100 outside of heat-exchange tube
Product, to improve heat exchange efficiency.It should be appreciated that in the other embodiment of the utility model, outer channel 130 can also be outside
The mode that wall surface helically extends is arranged.Fig. 7 is the distribution signal of the outer channel 130 in the utility model another kind embodiment
Figure.As shown in fig. 7, outer channel 130 can also be to circumferentially extend to form cricoid groove body around outside wall surface.
In conclusion the heat-exchange tube of the utility model comprising material is the tube wall of silicon carbide ceramics.Tube wall has interior
Wall surface and outside wall surface, internal face are provided with internal channel, and internal channel extends along the length direction of heat-exchange tube.Silicon carbide ceramics material
With high heat conductivility.But when under normal circumstances, needing heat transfer outward inside heat-exchange tube for high-temperature gas, steam
Medium can film condense to form complete liquid film and be covered on internal face, this liquid film thermal coefficient is often smaller, therefore serious shadow
Heat transfer is rung, the heat exchange restricted link of silicon carbide ceramics heat exchange pipe is become so that the carbonization with high thermal conductivity originally
Silicon ceramic performance can not play completely, and the heat transfer efficiency of existing silicon carbide ceramic is still not ideal enough.And when interior
When wall surface is provided with internal channel, film condenses the liquid film to be formed and can flow in internal channel, make under the surface tension effects of itself
The liquid film obtained on the heat-transfer surface outside internal channel is thinned, and considerably increases heat transfer efficiency in this way.And internal channel is in heat-exchange tube
Extend on length direction so that the liquid in internal channel can drain along interior raceway groove flowing in time, be unlikely to accumulate excessively cold
Lime set and the thinned effect for influencing liquid film on the heat-transfer surface outside heat-transfer effect and internal groove.
The heat exchanger of the utility model is provided with above-mentioned heat-exchange tube, therefore advantageous effect having the same, herein not
It repeats again.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of heat-exchange tube, it is characterised in that：
The heat-exchange tube includes tube wall, and the material of the tube wall is silicon carbide ceramics；The tube wall has internal face and outer wall
Face, the internal face are provided with internal channel, and the internal channel extends along the length direction of the heat-exchange tube.
2. heat-exchange tube according to claim 1, it is characterised in that：
The extending direction of the internal channel is consistent with the axis direction of the heat-exchange tube.
3. heat-exchange tube according to claim 1, it is characterised in that：
Two internal channels described above are provided on the internal face, each internal channel is in the circumferentially-spaced of the internal face
Arrangement.
4. heat-exchange tube according to claim 1, it is characterised in that：
The both ends of the internal channel are through to the end face at the heat-exchange tube both ends.
5. heat-exchange tube according to claim 1, it is characterised in that：
It is provided with protrusion in the internal channel.
6. heat-exchange tube according to any one of claims 1-5, it is characterised in that：
The outside wall surface is provided with outer channel.
7. heat-exchange tube according to any one of claims 1-5, it is characterised in that：
The depth of the internal channel is the 1/8~1/4 of the pipe thickness.
8. heat-exchange tube according to any one of claims 1-5, it is characterised in that：
The width of the internal channel is less than the thickness of the tube wall.
9. heat-exchange tube according to any one of claims 1-5, it is characterised in that：
The internal diameter of the heat-exchange tube is 8-60mm.
10. a kind of heat exchanger, it is characterised in that：
The heat exchanger includes heat-exchange tube as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721887593.3U CN207832009U (en) | 2017-12-28 | 2017-12-28 | A kind of heat-exchange tube and heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721887593.3U CN207832009U (en) | 2017-12-28 | 2017-12-28 | A kind of heat-exchange tube and heat exchanger |
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| Publication Number | Publication Date |
|---|---|
| CN207832009U true CN207832009U (en) | 2018-09-07 |
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| CN201721887593.3U Active CN207832009U (en) | 2017-12-28 | 2017-12-28 | A kind of heat-exchange tube and heat exchanger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007252A (en) * | 2017-12-28 | 2018-05-08 | 山东豪迈机械制造有限公司 | A kind of heat-exchange tube and heat exchanger |
-
2017
- 2017-12-28 CN CN201721887593.3U patent/CN207832009U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007252A (en) * | 2017-12-28 | 2018-05-08 | 山东豪迈机械制造有限公司 | A kind of heat-exchange tube and heat exchanger |
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