CN106767097A - Heat exchanger tube and double pipe heat exchanger - Google Patents
Heat exchanger tube and double pipe heat exchanger Download PDFInfo
- Publication number
- CN106767097A CN106767097A CN201710021663.5A CN201710021663A CN106767097A CN 106767097 A CN106767097 A CN 106767097A CN 201710021663 A CN201710021663 A CN 201710021663A CN 106767097 A CN106767097 A CN 106767097A
- Authority
- CN
- China
- Prior art keywords
- heat exchanger
- exchanger tube
- fin
- fin unit
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/34—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely
- F28F1/36—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely the means being helically wound fins or wire spirals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
Abstract
The invention discloses a kind of heat exchanger tube and double pipe heat exchanger.Multiple fin structures are provided with the internal face and/or outside wall surface of the heat exchanger tube, the fin structure includes multiple fin units, the multiple fin unit includes the first fin unit being connected with the internal face and/or outside wall surface of the heat exchanger tube and the second fin unit being connected with first fin unit, the cross section of first fin unit is in the first squashed structure, the cross section of second fin unit is in the second squashed structure, has angle between the length direction of first squashed structure and the length direction of second squashed structure.The fin structure of the heat exchanger tube that the present invention is provided has angle between including having in multiple fin units and multiple fin units two length directions of the cross section of fin unit, the heat exchange area of heat exchanger tube is effectively improved by the improvement to fin structure, and then improve the heat exchange efficiency of heat exchanger tube, and simple structure, it is readily produced, cost is relatively low.
Description
Technical field
The present invention relates to field of heat exchange, relate more specifically to a kind of heat exchanger tube and the casing type heat exchanging using the heat exchanger tube
Device.
Background technology
Double pipe heat exchanger is the heat exchanger set by two kinds of different pipe sleeves of diameter.Existing bushing type is changed
Hot device outer tube typically uses steel pipe, and interior form of tubes is more, there is what is directly bent using single larger bare copper tube, also has using many
Bent together after the small bare copper tube beam combination of root, also have using single spiral light pipe directly bend etc..And copper pipe is universal
Using embossed surface technique, overall heat exchange efficiency is relatively low, can only improve heat exchanger by the way of sleeve pipe entire length is increased
Heat exchange efficiency, in actual application, particularly with space size limitation place, traditional scheme design in there is chi
The excessive defect for not meeting installation requirement of very little, volume.To solve this problem, used on the wall of heat exchanger tube in existing structure
The mode of fin is set to improve heat exchange efficiency, but this heat exchanger heat exchange property using single fin structure is still relatively low.
The content of the invention
In view of this, an object of the present invention is to provide a kind of simple structure, heat exchange efficiency heat exchanger tube and sleeve pipe high
Formula heat exchanger.
It is up to above-mentioned purpose, first aspect, there is provided a kind of heat exchanger tube.
A kind of heat exchanger tube, is provided with multiple fin structures, the fin on the internal face and/or outside wall surface of the heat exchanger tube
Structure includes multiple fin units, and the multiple fin unit includes being connected with the internal face and/or outside wall surface of the heat exchanger tube
The first fin unit and the second fin unit for being connected with first fin unit, first fin unit it is transversal
Face is in the first squashed structure, and the cross section of second fin unit is in the second squashed structure, the length of first squashed structure
There is angle between degree direction and the length direction of second squashed structure.
Preferably, the length direction of first squashed structure mutually hangs down with the length direction of second squashed structure
Directly.
Preferably, the thickness of first fin unit is from the internal face and/or outer wall of the heat exchanger tube towards described
The direction of two fin units is gradually reduced.
Preferably, the two sides of first fin unit and/or second fin unit are in curved surface.
Preferably, smoothed surface blending connection between first fin unit and second fin unit；With/
Or,
Smoothed surface blending connects between first fin unit and the internal face and/or outside wall surface of the heat exchanger tube
Connect.
Preferably, the cross section of the fin structure is T-shaped.
Preferably, the heat exchanger tube is multiple-threaded spiral corrugated pipe.
Preferably, it is circumferentially arranged in the outside wall surface of the heat exchanger tube to have a plurality of first raised, inwall of the heat exchanger tube
It is circumferentially arranged on face to have a plurality of second projection, and second projection is located between adjacent two first projections, described first is convex
Rise and second projection axis helically line, the cross section of first projection is trapezoidal, second projection it is transversal
Face is curved.
Preferably, the fin structure extends along the hand of spiral of the heat exchanger tube.
Preferably, the thickness of pipe t of the heat exchanger tube is 0.8 to 1.5mm；And/or,
The number of starts of the heat exchanger tube is 6 to 8；And/or,
The thread pitch p of the heat exchanger tube is 8 to 20mm；And/or,
The thread groove width w of the heat exchanger tube is 3 to 7mm；And/or,
The outside diameter d 1 of the heat exchanger tube is 25 to 40mm；And/or,
The internal diameter d2 of the heat exchanger tube is 15 to 28mm.
Second aspect, the present invention provides a kind of double pipe heat exchanger.
A kind of double pipe heat exchanger, including outer tube and the inner tube that is sheathed in the outer tube, said inner tube are as above institute
The heat exchanger tube stated.
The fin structure of the heat exchanger tube that the present invention is provided includes there are two wings in multiple fin units and multiple fin units
There is angle between the length direction of the cross section of blade unit, the heat exchange of heat exchanger tube is effectively improved by the improvement to fin structure
Area, and then improve the heat exchange efficiency of heat exchanger tube, and simple structure, it is easy to produce, cost is relatively low.
The double pipe heat exchanger that the present invention is provided uses above-mentioned heat exchanger tube, and simple structure, low cost, heat exchange efficiency is high.
Brief description of the drawings
By description referring to the drawings to the embodiment of the present invention, of the invention above-mentioned and other purposes, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 shows the structural representation of the heat exchanger tube of the partial vertical sectional that the specific embodiment of the invention is provided；
Fig. 2 Fig. 1 is shown in A-A to sectional view；
Fig. 3 shows the partial enlarged drawing at B in Fig. 1；
Fig. 4 shows the double pipe heat exchanger that the specific embodiment of the invention is provided.
In figure, 1, heat exchanger tube；2nd, fin structure；21st, the first fin unit；211st, the first squashed structure；22nd, the second fin
Unit；221st, the second squashed structure；3rd, first is raised；4th, the first groove；5th, second is raised；6th, the second groove；7th, thread protrusion；
8th, outer tube.
Specific embodiment
Below based on embodiment, present invention is described, but the present invention is not restricted to these embodiments.Under
It is detailed to describe some specific detail sections during text is to detailed description of the invention.Do not have for a person skilled in the art
The description of these detail sections can also completely understand the present invention.In order to avoid obscuring essence of the invention, known method, mistake
Journey, flow, element do not have narration in detail.
Additionally, it should be understood by one skilled in the art that accompanying drawing is provided to descriptive purpose provided herein, and
What accompanying drawing was not necessarily drawn to scale.
Unless the context clearly requires otherwise, otherwise entire disclosure and " including " in claims, similar etc. "comprising"
Word should be construed to the implication for including rather than exclusive or exhaustive implication；That is, be " including but not limited to " contains
Justice.
In the description of the invention, it is to be understood that term " first ", " second " etc. be only used for describe purpose, without
It is understood that to indicate or implying relative importance.Additionally, in the description of the invention, unless otherwise indicated, the implication of " multiple "
It is two or more.
This application provides a kind of heat exchanger tube, as shown in Figure 1 to Figure 3, multiple fins are provided with the outside wall surface of heat exchanger tube 1
Structure 2, fin structure 2 extends in the outside wall surface of heat exchanger tube, and the heat exchange area of heat exchanger tube is increased by fin structure 2.Wing
Chip architecture 2 includes multiple fin units, and multiple fin units include the first fin unit being connected with the outside wall surface of heat exchanger tube 1
21 and the second fin unit 22 for being connected with the first fin unit 21, wherein, the cross section of the first fin unit 21 is in first
Squashed structure (i.e. with a length direction more long and a shorter width) 211, the horizontal stroke of the second fin unit 22
Section is in the second squashed structure 221, the length direction of the length direction of the first squashed structure 211 and the second squashed structure 221 it
Between have angle, on the one hand, settings of multiple fin units can improve the surface area of heat exchanger tube, another aspect, two fin lists
Set in angle between unit and enable that fin unit is exchanged heat in different angles and fluid, by fin structure 2
Improvement effectively improves the heat exchange area of heat exchanger tube, and then improves the heat exchange efficiency of heat exchanger tube, compared to existing under equal heat exchange efficiency
There is heat exchanger tube to take small volume, and simple structure, it is easy to produce, cost is relatively low.
Angle numerical value of first squashed structure 211 with the second squashed structure 221 in the longitudinal direction is not limited specifically, for convenience
Set, be preferably arranged in a mutually vertical manner, it is further preferred that as shown in figure 3, the section of fin structure 2 is T-shaped, section is T-shaped
Fin structure 2 can improve the microcosmic flow direction of the fluid for flowing through the outside of heat exchanger tube 1, further improve the conductivity of heat of heat exchanger tube 2
Energy.
Further, the first fin unit 21 and the second fin unit 22 are in continuous strip laminated structure, first
The width of fin unit 21 is radially extended along heat exchanger tube 1, the width of the second fin unit 22 along heat exchanger tube 1 axle
To extension, the heat transfer effect of fin structure 2 is so can further improve.
Further, the arrangement mode of the first fin unit 21 and the second fin unit 22 in the outside wall surface of heat exchanger tube 1 is not
Limit, is perfectly even covered with the whole outside wall surface of heat exchanger tube 1, and in one embodiment, fin structure 2 prolongs along the circumference of heat exchanger tube 1
Stretch, i.e. multi-turn fin structure 2 is set in the outside wall surface of heat exchanger tube 1, in another embodiment, a plurality of fin structure 2 is along changing
Heat pipe 1 it is axially extending, and along the circumferential uniform of heat exchanger tube 1, In yet another embodiment, a plurality of fin structure 2 is in heat exchanger tube 1
Outside wall surface on helically line arrangement, preferably multi-head spiral line (having the introduction of specific embodiment below).
Further, the thickness of the first fin unit 21 from the outer wall of heat exchanger tube towards the direction of the second fin unit 22 by
It is decrescence small, on the one hand, the structural strength of fin structure 2 can be improved, on the other hand, it is also possible to improve the side of the first fin unit 21
The area in face such that it is able to further increase the surface area of heat exchanger tube 1.Two opposite sides 212 of first fin unit 21
Concrete shape is not limited, preferably curved surface, can further improve the heat exchange area of the first fin unit 21.Specifically, first
On the section of fin unit 21, two sides 212 of the first fin unit 21 are in oblique line (as shown in Figure 3), camber line or wave.
Further, be the surface area that further increases heat exchanger tube 1, the two sides 222 of the second fin unit 22 it is also preferred that
In curved surface, in one embodiment, the both sides of the second fin unit 22 bend towards the same side so that the second fin unit 22 is in
Bending plate, in another embodiment, the second fin unit 22 is gradually reduced (such as Fig. 3 institutes from centre to two side thickness
Show), in a still further embodiment, the second fin unit 22 is gradually increased from centre to two side thickness.The change of thickness can
So that fluid produces extruding, shunting action in flow process to fluid, the heat transfer effect of fluid is further improved.
Further, smoothed surface blending connection, the first wing between the first fin unit 21 and the second fin unit 22
Also smoothed surface blending connection, on the one hand can improve structural strength between the outside wall surface of blade unit 21 and heat exchanger tube 1, another
Aspect can avoid producing the motion dead angle of fluid.
Further, thread protrusion 7 is provided with the internal face 1 of heat exchanger tube, thread protrusion 7 can improve heat exchanger tube 1
Internal face heat exchange area, further improve heat exchanger tube 1 heat exchange efficiency.
Further, fin structure 2 preferably with heat exchanger tube 1 in integrative-structure set, thread protrusion 7 preferably also with heat exchanger tube
1 is set in integrative-structure, is conducive to the transmission of heat.
In a preferred embodiment, as shown in Figure 1-2, heat exchanger tube 1 is multiple-threaded spiral corrugated pipe so that heat exchanger tube 1
Body form the structure of concavo-convex alternate (outer wall and inwall are concavo-convex alternate) in the circumferential so that the outside wall surface of heat exchanger tube 1
It is in rough surface with internal face, and fin structure 2 is formed on rough surface.Concaveconvex structure is in axial direction
Upper formation helical form, i.e. in the outside wall surface of heat exchanger tube 1 it is circumferentially arranged have a plurality of first projection 3, the first projection 3 axis be in
Helix, 3 position raised with first corresponding position forms the first groove 4 on the internal face of heat exchanger tube 1, multiple first raised 3 it
Between form the second groove 6 in the outside wall surface of heat exchanger tube 1, the axis of the second groove 6 also helically line, in the inwall of heat exchanger tube 1
The second projection 5 is formed on face with the position corresponding position of the second groove 6, i.e., second raised 5 is located between adjacent two first projections 3,
That is, the body of heat exchanger tube 1 is spaced indent in the circumferential, so that fluid forms spiral flow direction, is changed when fluid flows through this
Advance in vortex during heat pipe 1, heat transfer property is stronger.
It is further preferred that the section of the first projection 3 is in generally trapezoidal, and side long is located at the radial outside of short side, second
Raised 5 section is curved, preferably in substantially circular arc, between the first raised 3 and second projection 5 and the first projection 3 is turned
Angle is arc transition, is so obtained in that more preferable fluid flow direction and preferably heat exchange property.
Further, fin structure 2 extends along the hand of spiral of heat exchanger tube 1, i.e. the axis of fin structure 2 helically line,
And the first projection 3 with heat exchanger tube 1, the helix of the second groove 6 are parallel.Specifically, the first fin unit 21 and the second fin
The helically platy structure of unit 22.
Further, multiple-threaded spiral corrugated pipe is formed by efficiently managing by spinning, and processing method is simple, low production cost.
Preferably, as shown in figure 1, the thickness of pipe t of heat exchanger tube 1 is 0.8 to 1.5mm, the number of starts of heat exchanger tube 1 is 6 to 8,
The thread pitch p of heat exchanger tube 1 is 8 to 20mm, and the thread groove width w of heat exchanger tube 1 is 3 to 7mm, the outside diameter d 1 of heat exchanger tube 1 for 25 to
40mm, the internal diameter d2 of heat exchanger tube 1 is 15 to 28mm.So can further improve the heat exchange property of heat exchanger tube 1.
It is, of course, understood that fin structure 2 is not limited to be arranged in the outside wall surface of heat exchanger tube 1, it is also possible to set
Above-mentioned fin structure 2 is respectively provided with the internal face of heat exchanger tube 1, or on outside wall surface and internal face.In addition, fin structure 2
It is not limited to only include the first fin unit 21 and the second fin unit 22, may also include other fin units, specifically can root
It is configured according to the size requirement of heat exchange demand and exchange heat pipe.
Further, present invention also provides a kind of double pipe heat exchanger, as shown in figure 4, it includes outer tube 8 and is arranged
Inner tube in outer tube 8, outer tube 8 is coaxially disposed with inner tube, and inner tube is heat exchanger tube as described above, and heat exchange efficiency is high, takes body
Product is small.Outer tube 8 and inner tube are preferably in spiral fashion structure so that structure is compacter.
Further, due to the multiple-threaded spiral corrugated pipe that inner tube is made of efficient pipe, strengthened using rotary refrigerating agent and passed
Heat, and utilization space, make the heat transferring medium such as water route inside and outside inner tube that spirality channel is utilized in convection process with refrigerant
Fully laminating contact, both enhances the coefficient of heat transfer, and heat exchange area is increased again, and fluid mobility might as well.In addition, because when refrigeration
During agent reverse flow, the heat exchange area of the coefficient of heat transfer and unit volume increases, thus the heat exchanger either as condenser also
It is that, used as evaporator, heat exchange property is equally outstanding.
In addition, the double pipe heat exchanger that the application is provided not only is greatly improved on heat exchange property, and energy save space,
The material-saving under conditions of equal heat exchange amount demand, reduces overall processing difficulty, and its service life and other reliabilities are also very
Guaranteed, overall price/performance ratio is greatly improved.
Those skilled in the art is it is easily understood that on the premise of not conflicting, above-mentioned each preferred scheme can be free
Ground combination, superposition.
It should be appreciated that above-mentioned implementation method is only illustrative, and not restrictive, without departing from of the invention basic
In the case of principle, various obvious or equivalent modification or replace that those skilled in the art can make for above-mentioned details
Change, be all included in scope of the presently claimed invention.
Claims (11)
1. a kind of heat exchanger tube, it is characterised in that multiple fin knots are provided with the internal face and/or outside wall surface of the heat exchanger tube
Structure, the fin structure includes multiple fin units, the multiple fin unit include with the internal face of the heat exchanger tube and/or
First fin unit of outside wall surface connection and the second fin unit being connected with first fin unit, first fin
The cross section of unit is in the first squashed structure, and the cross section of second fin unit is in the second squashed structure, and described first is flat
There is angle between the length direction of the length direction of shape structure and second squashed structure.
2. heat exchanger tube according to claim 1, it is characterised in that the length direction of first squashed structure and described
The length direction of two squashed structures is mutually perpendicular to.
3. heat exchanger tube according to claim 1, it is characterised in that the thickness of first fin unit is from the heat exchanger tube
Internal face and/or outer wall be gradually reduced towards the direction of second fin unit.
4. heat exchanger tube according to claim 1, it is characterised in that first fin unit and/or second fin
The two sides of unit are in curved surface.
5. heat exchanger tube according to claim 1, it is characterised in that first fin unit and second fin unit
Between the connection of smoothed surface blending；And/or,
Smoothed surface blending connection between first fin unit and the internal face and/or outside wall surface of the heat exchanger tube.
6. heat exchanger tube according to claim 1, it is characterised in that the cross section of the fin structure is T-shaped.
7. heat exchanger tube according to claim 1, it is characterised in that the heat exchanger tube is multiple-threaded spiral corrugated pipe.
8. heat exchanger tube according to claim 7, it is characterised in that circumferentially arranged in the outside wall surface of the heat exchanger tube to have many
Bar first is raised, circumferentially arranged on the internal face of the heat exchanger tube to have a plurality of second projection, and second projection is located at phase
Between adjacent two first projections, the axis of the described first raised and described second projection helically line, first projection it is transversal
Face is trapezoidal, and the cross section of second projection is curved.
9. heat exchanger tube according to claim 7, it is characterised in that the fin structure along the heat exchanger tube the hand of spiral
Extend.
10. heat exchanger tube according to claim 7, it is characterised in that the thickness of pipe t of the heat exchanger tube is 0.8 to 1.5mm；With/
Or,
The number of starts of the heat exchanger tube is 6 to 8；And/or,
The thread pitch p of the heat exchanger tube is 8 to 20mm；And/or,
The thread groove width w of the heat exchanger tube is 3 to 7mm；And/or,
The outside diameter d 1 of the heat exchanger tube is 25 to 40mm；And/or,
The internal diameter d2 of the heat exchanger tube is 15 to 28mm.
11. a kind of double pipe heat exchangers, it is characterised in that including outer tube and the inner tube being sheathed in the outer tube, it is described interior
Heat exchanger tube described in Guan Weiru any one of claim 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710021663.5A CN106767097A (en) | 2017-01-12 | 2017-01-12 | Heat exchanger tube and double pipe heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710021663.5A CN106767097A (en) | 2017-01-12 | 2017-01-12 | Heat exchanger tube and double pipe heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106767097A true CN106767097A (en) | 2017-05-31 |
Family
ID=58947825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710021663.5A Pending CN106767097A (en) | 2017-01-12 | 2017-01-12 | Heat exchanger tube and double pipe heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106767097A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107462088A (en) * | 2017-08-08 | 2017-12-12 | 上海悠太节能科技中心（有限合伙） | Efficient freeze proof heat exchange coil and its manufacture method |
| CN108225058A (en) * | 2017-12-27 | 2018-06-29 | 青岛海尔智能技术研发有限公司 | Air-conditioning heat exchanger |
| CN109974482A (en) * | 2019-04-29 | 2019-07-05 | 浙江康利德科技有限公司 | Double-pipe condenser |
| CN113521961A (en) * | 2021-08-03 | 2021-10-22 | 湖南汇虹试剂有限公司 | Ultra-clean high-purity absolute ethyl alcohol extraction device |
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| DE3408626A1 (en) * | 1984-03-09 | 1985-09-12 | Wieland-Werke Ag, 7900 Ulm | Wound heat exchanger, in particular for heat pumps or refrigerating plants |
| CN2257376Y (en) * | 1995-12-18 | 1997-07-02 | 华南理工大学 | T type finned heat-transfer tube with internal helical fin |
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| CN201034436Y (en) * | 2007-03-27 | 2008-03-12 | 高克联管件(上海)有限公司 | Dual-reinforced evaporating heat transfer tube |
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| 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 |
| CN105387736A (en) * | 2015-12-17 | 2016-03-09 | 英特换热设备(浙江)有限公司 | Efficient heat exchanger employing reinforced spiral pipe |
| CN206399267U (en) * | 2017-01-12 | 2017-08-11 | 珠海格力电器股份有限公司 | Heat exchanger tube and double pipe heat exchanger |
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| JPS57160579U (en) * | 1981-03-26 | 1982-10-08 | ||
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| CN2257376Y (en) * | 1995-12-18 | 1997-07-02 | 华南理工大学 | T type finned heat-transfer tube with internal helical fin |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107462088A (en) * | 2017-08-08 | 2017-12-12 | 上海悠太节能科技中心（有限合伙） | Efficient freeze proof heat exchange coil and its manufacture method |
| CN108225058A (en) * | 2017-12-27 | 2018-06-29 | 青岛海尔智能技术研发有限公司 | Air-conditioning heat exchanger |
| CN109974482A (en) * | 2019-04-29 | 2019-07-05 | 浙江康利德科技有限公司 | Double-pipe condenser |
| CN113521961A (en) * | 2021-08-03 | 2021-10-22 | 湖南汇虹试剂有限公司 | Ultra-clean high-purity absolute ethyl alcohol extraction device |
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Application publication date: 20170531 |