CN105651097B - A kind of finned tube of fin axial direction spacing change - Google Patents
A kind of finned tube of fin axial direction spacing change Download PDFInfo
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- CN105651097B CN105651097B CN201610111588.7A CN201610111588A CN105651097B CN 105651097 B CN105651097 B CN 105651097B CN 201610111588 A CN201610111588 A CN 201610111588A CN 105651097 B CN105651097 B CN 105651097B
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- fin
- base tube
- tube
- axial direction
- along
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Classifications
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- 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
- F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
- F28F1/422—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element with outside means integral with the tubular element and inside means integral with the tubular element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/085—Heat exchange elements made from metals or metal alloys from copper or copper alloys
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention provides a kind of heat exchanger tube of fin axial direction spacing change, the heat exchanger tube includes base tube and fin, the fin is multiple, the multiple fin is spaced apart and arranged on the base tube along the axis direction of the base tube, and described each fin is parallel to the cross section of the base tube, characterized in that, along the flow direction of base tube fluid, the distance at the adjacent fins interval on the axial direction of base tube is constantly reduced.The present invention is changed by setting the distance between fin, can farthest absorb heat.
Description
Technical field
The invention belongs to field of heat exchangers, more particularly to a kind of heat exchanger component-finned tube.
Background technology
With the high speed development of modern social economy, the mankind are increasing to the demand of the energy.But coal, oil, day
The traditional energy storage levels such as right gas constantly reduce, increasingly in short supply, rising steadily for price are caused, while conventional fossil fuel is caused
Problem of environmental pollution it is also further serious, these development that all limit society significantly and the raising of human life quality.Therefore
For energy saving, heat transfer enhancement technology is evolving, and finned tube is also commonly used in field of heat exchange.Current existing skill
Fin in art is all one and is integrally provided on base tube, therefore the function of augmentation of heat transfer is although served using finned tube, but
It is the gas converting heat aspect of such as flue gas heat exchange, also impurity under certain operating conditions, or the grey phenomenon of collection occurs, causes to change
Hot coefficient declines, therefore the situation that the present invention occurs for currently available technology, it is proposed that a kind of new heat exchanger tube.
The content of the invention
The present invention is intended to provide a kind of finned tube of energy-conserving and environment-protective, can both meet the function of augmentation of heat transfer, while may be used also
Largely to reduce collection ash.
To achieve these goals, technical scheme is as follows：A kind of heat exchanger tube of fin axial direction spacing change, institute
Heat exchanger tube is stated including base tube and fin, the fin is multiple, the multiple fin along the base tube axis direction compartment of terrain
It is arranged on the base tube, and described each fin is parallel to the cross section of the base tube, it is characterised in that along in base tube
The flow direction of fluid, the distance at the adjacent fins interval on the axial direction of base tube is constantly reduced.
Preferably, along the flow direction of base tube fluid, the distance at the fin interval on the axial direction of base tube is not
The amplitude of disconnected reduction constantly increases.
Preferably, the fin is multigroup, and multigroup fin is spaced apart and arranged in institute along the axis direction of the base tube
State on base tube, and every group of fin is parallel to the cross section of the base tube, every group of fin includes two fins, described
Two fins it is symmetrical along the face where the axis of base tube, the shape of cross section of described base tube is rectangle, described fin
Be shaped as rectangle, between described two fins formed first opening and second opening, it is described first opening and second opening along
Face where the axis of base tube is symmetrical.
Preferably, along the flow direction of base tube fluid, the distance at the fins set interval on the axial direction of base tube
Constantly reduce.
Preferably, along the flow direction of base tube fluid, what the adjacent fins group on the axial direction of base tube was spaced
The amplitude that distance is constantly reduced constantly increases.
Preferably, the cross section of described base tube is square, and the substrate tube sets inner fin, and the inner fin connects
The diagonal of rectangle is connect, substrate tube is divided into multiple passage aisles, intercommunicating pore is set on inner fin by the inner fin, so that phase
Adjacent passage aisle communicates with each other, and described intercommunicating pore is circle, the foursquare a length of L of inner edge, the radius of the intercommunicating pore
R, the distance between adjacent intercommunicating pore center of circle is l on the same fin, meets following relation：
l/L*10=a*ln(r/L*10)+b；
Wherein ln is logarithmic function, and a, b are parameter, 1.45<a<1.62,2.89<b<3.10;
0.33<l/L<0.39;
0.13<r/L<0.18;
30mm<L<140mm；
5mm<r<19mm。
Preferably, 14mm<l<43mm.
Compared with prior art, the present invention has the advantage that：
1）By setting the Axial changes of spacing of fin, heat can be farthest absorbed, so that further reinforcing is passed
Heat.
2）There is provided a kind of square tube heat exchanger tube of Novel structure, opened by setting the first opening and second on heat exchanger tube
Mouthful, reduce collection ash.
3）Rectangle is set to by heat exchanger tube base tube and fin, the synergy of heat exchanger tube base tube and fin shape is realized,
Augmentation of heat transfer
4）Intercommunicating pore is opened up by substrate tube, while ensureing to improve heat exchange efficiency, the stream in base tube is reduced
Dynamic resistance.
5）The present invention, in the case where ensureing that heat exchange amount is maximum and flow resistance satisfaction is required, is obtained by test of many times
To an optimal heat exchanger tube optimum results, and by being verified, so as to demonstrate the accuracy of result.
Brief description of the drawings
Fig. 1 is the cross-sectional view of H types finned tube of the present invention；
Fig. 2 is the side structure schematic view of H types finned tube of the present invention；
Fig. 3 is base tube cross-sectional structure schematic diagram of the present invention；
Fig. 4 is inner fin intercommunicating pore distribution schematic diagram of the present invention；
Fig. 5 is inner fin intercommunicating pore stagger arrangement distribution schematic diagram of the present invention；
Fig. 6 is square dimensions schematic diagram in base tube of the present invention.
Reference is as follows：
1 base tube, 2 first openings, 3 second openings, 4 first fins, 5 second fins, 6 inner fins, 7 intercommunicating pores, 8 is small logical
Road.
Specific embodiment
Specific embodiment of the invention is described in detail below in conjunction with the accompanying drawings.
The invention discloses a kind of finned tube, the finned tube includes base tube and its transverse fin being arranged on base tube,
The cross section of the base tube is rectangle, and described fin shape is rectangle.
By setting rectangular fin and rectangle base tube so that base tube is identical with fin shape so that heat exchange field reaches collaboration,
The distribution arrangement of heat, transmission quantity reach it is circumferential essentially identical so that further augmentation of heat transfer.
Preferably, Fig. 1 illustrates a kind of cross-sectional view of H types finned tube.As shown in figure 1, H type finned tubes include
Base tube 1 and fin 4,5, the fin 4,5 for multigroup, multigroup fin 4,5 along the base tube 1 axis direction（That is base tube
Centerline direction on）It is spaced apart and arranged on the base tube 1, and every group of fin 4,5 is parallel to the horizontal stroke of the base tube 1
Section, every group of fin includes the first fin 4 and the second fin 5, and the first described fin 4 and the second fin 5 are along base tube 1
Axis where the first face it is symmetrical, the shape of cross section of described base tube 1 is rectangle, the first described fin 4 and the second wing
Piece 5 is shaped as rectangle, and described two fins 4 form the first opening 2 and the second opening 3, first opening 2 and second between 5
Opening 3 is symmetrical along the second face where the axis of base tube 1.
Preferably, first face and the second face are vertical.
By setting the first opening 2 and the second opening 3, it is possible to reduce the collection ash on heat exchanger tube.Simultaneously as base tube and wing
The shape of piece is all rectangle, can reach shape and be adapted, further augmentation of heat transfer.
Preferably, the width W of the opening 3 of first opening 2 and second is 6-8mm.
Preferably, the cross section of described base tube 1 is square.
Preferably, as shown in figure 1, first opening 2 is located at the top of the base tube.Second opening is located at
The bottommost of the base tube pipe.I.e. first opening 2 and the second opening 3 are symmetrical above and below along the horizontal plane where the axis of base tube 1.
Fig. 2 illustrates the axial direction along base tube 1（I.e. on length direction）It is multiple（It is multigroup）The interval setting of fin 4,5.
Preferably, along the flow direction of base tube fluid, the adjacent fins group interval on the axial direction of base tube 1
Distance constantly reduce.Because the fluid in base tube constantly absorbs heat along flow direction, and temperature more and more higher, heat absorption
Ability can also be deteriorated accordingly, therefore be changed by setting the distance between fins set, can farthest absorb heat.Phase
Answer, exothermic process there is also this problem.
Preferably, along the flow direction of base tube fluid, the adjacent fins group interval on the axial direction of base tube 1
Distance constantly reduce amplitude constantly increase.It is found through experiments that, this kind of setting can improve 10% or so heat exchange
Amount.
Spacing between adjacent fins group is 5-20mm, spacing herein be between the relative face of adjacent fins group away from
From.
Preferably, the inside of the base tube 1 sets inner fin 6, the connection base tube 1 of the inner fin 6 is rectangular diagonal, such as
Shown in Fig. 3.The inner fin 6 will be divided into multiple passage aisles 8 inside base tube 1, intercommunicating pore 7 be set on inner fin, so that phase
Adjacent passage aisle 8 communicates with each other.
By setting inner fin 6, multiple passage aisles 8 will be divided into inside base tube 1, further augmentation of heat transfer, but accordingly
The pressure of flow of fluid increases.By setting intercommunicating pore 7, it is ensured that the connection between adjacent passage aisle 8, so that pressure is big
Passage aisle in fluid can in the small passage aisle of neighbouring pressure flow, solve condensation end each small flow channels pressure of inside
The problem that power is uneven and local pressure is excessive, so as to promote abundant flowing of the fluid in heat exchanger channels, while passing through
The setting of intercommunicating pore 7, also reduces the pressure inside base tube 1, improves heat exchange efficiency, while also improving the use of base tube 1
Life-span.
Preferably, along the flow direction of fluid in base tube 1, the area of the intercommunicating pore 7 constantly increases.
Described intercommunicating pore 7 is circular configuration, along the flow direction of fluid in base tube 1, the radius of the circular configuration
Constantly increase.
Because along the flow direction of fluid in base tube 1, the fluid in base tube 1 constantly even evaporate by heat absorption, therefore makes
The pressure for obtaining base tube 1 constantly increases, and because the presence of intercommunicating pore 7 so that the pressure distribution inside base tube 1 is more and more equal
It is even, therefore the area needs of intercommunicating pore are very big, constantly become greatly by setting, so that ensureing that inside heat pipe pressure is uniform
In the case of pressure, heat exchange area is increased by connecting the change of hole area, so as to improve heat exchange efficiency.
Preferably, along the flow direction of fluid in base tube 1, the continuous increased amplitude of area of the intercommunicating pore 7 is not
It is disconnected to increase.It is also the Changing Pattern for meeting flowing pressure by being arranged such, while further reducing flow resistance, improves
Heat exchange efficiency.By being arranged such, by being that experiment finds that 8% or so heat exchange efficiency can be improved, while resistance keeps substantially
It is constant.
Preferably, along the flow direction of fluid in base tube 1, the distributed quantity of intercommunicating pore 7 is more and more, further excellent
Choosing, constantly increased amplitude is continuously increased the connection hole number.
Distribution Principle by above-mentioned quantity is identical with area reduction principle, compared with connection hole number is identical, leads to
Distributed number is crossed to reduce circulation area.
In actual experiment find, the area of intercommunicating pore 7 can not be too small, it is too small if can cause the increase of flow resistance,
So as to cause the decrease of heat exchange, the area of intercommunicating pore 7 can not be excessive, and area is excessive, can cause the reduction of heat exchange area, so as to drop
Low heat transfer effect.Equally, the cross-sectional area of base tube 1 can not be excessive, the excessive heat exchange for causing to be distributed in tube plate structure unit length
Pipe is very few, again results in heat transfer effect variation, and the flow area of base tube 1 can not be too small, too small to cause the flow resistance to increase, from
And cause heat transfer effect to be deteriorated.Therefore intercommunicating pore 7 is necessary with the distance between the cross-sectional area of base tube 1 and its adjacent intercommunicating pore 7
Meet certain requirements.
Therefore, the present invention be by the thousands of numerical simulations and test data of multiple various sizes of heat exchanger tubes,
In the case of meeting industrial requirements pressure-bearing（Below 10MPa）, in the case where maximum heat exchange amount is realized, the optimal base tube for summing up
Dimensionally-optimised relation.
The present invention is that base tube cross section is carry out under square dimensionally-optimised.
The foursquare interior length of side（The i.e. foursquare outer length of side subtracts wall thickness）It is L, the radius r of the intercommunicating pore, institute
The distance between intercommunicating pore adjacent on same fin is stated for l, following relation is met：
l/L*10=a*ln(r/L*10)+b；
Wherein ln is logarithmic function, and a, b are parameter, 1.45<a<1.62,2.89<b<3.10;
0.33<l/L<0.39;
0.13<r/L<0.18;
30mm<L<140mm；
5mm<r<19mm。
Wherein, l is equal to the distance between center of circle of adjacent intercommunicating pore 7.Left and right as shown in Figure 4,5 is adjacent and neighbouring
The distance between intercommunicating pore center of circle.
Further preferably, 14mm<l<43mm.
Preferably, with the increase of r/L, described a, b increases.
Preferably, a=1.55, b=3.03.
Preferably, as shown in Figure 4,5, multiple rows of intercommunicating pore 7 is set on each inner fin, as shown in figure 5, the multiple company
Through hole 7 is wrong row's structure.By mistake, row connects structure, can further improve heat exchange, reduces pressure.
Preferably, the material of base tube is albronze, the mass percent of the component of the albronze is as follows：
3.7% Cr, 3.3% Ag, 2.2% Mn, 1.25% Zr, 1.23% Ce, 1.25% Ti, 2.46% Si, remaining
It is Cu, Al, the ratio of Cu, Al is（8.53-10.23）:1.12.
The manufacture method of albronze is：Using vacuum metallurgy melting, argon for protecting pouring is equal by 820 DEG C into round billet
Treatment is homogenized, at 640 DEG C, using bar is hot extruded into, then again by after 565 DEG C of solution hardening, when carrying out artificial for 230 DEG C
Effect treatment.
After tested, above-mentioned alloy has thermal conductivity factor very high, and thermal conductivity factor is more than 250W/ (m*k）.
By increasing the ratio of copper in albronze, the heat resistance of alloy is greatly increased, while also improving the anti-of alloy
Rotten performance.
Base tube and fin can be with integrally manufactured, it is also possible to which split is manufactured, and base tube and fin can also be different materials, example
If base tube is above-mentioned albronze, fin can then use other alloys, and wherein other alloys composition is as follows：
The following Ni 30% of mass percent；Cr 20%；Al 6%；C 0.03%；B 0.016%；Co 2%； Ti
3%；Nb 0.1%；La 0.2%；Ce0.2%；Fe surpluses.
The manufacture method of alloy is：By the composition smelting and pouring ingot in vaccum sensitive stove according to electrothermal alloy, so
Alloy pig hot forging into bar is rolled into disk material at 1200 DEG C -900 DEG C at 1200 DEG C -900 DEG C afterwards, then in room temperature cold-drawn into not
The silk material of same specification.
After tested, above-mentioned alloy has thermal conductivity factor very high.
Preferably, the base tube 1 and finned outer coating anticorrosive coat.
Preferably, the anticorrosive coat is generated by anticorrosive paint, anticorrosive paint is by as follows into being grouped into：Zinc flake
8.3%, aluminum oxide is 8%, and boric acid is 7.3%, and acrylic acid is 0.7%, and wetting dispersing agent is 0.4%, and thickener is
0.15%, defoamer is 0.23%, the water of surplus.
A kind of method for preparing above-mentioned water-based anticorrosive paint, the method is implemented according to following steps,
A, by coating gross mass percentage, a certain amount of water, 0.4% wetting dispersing agent and 0.23% are weighed respectively and are disappeared
Infusion, it is then admixed together, it is sufficiently stirred for being allowed to dissolving and is made coating mixed liquor A 1, then coating is accounted for being added in mixed liquor A 1
The flake metal powder of the 8.3% of gross mass, stirs and is made coating mixed liquor A 2；
B, by coating gross mass percentage, weigh 7.3% boric acid, constitute mixed liquor, be added in 20%~40% water
Fully dissolving is made inorganic acid mixed liquid B 1, then to 8% oxidate powder is added in mixed liquid B 1, stirring is extremely made nothing without precipitation
Machine acid mixed liquid B 2；
C, by coating gross mass percentage, weigh 0.7% acrylic acid, be added in 5%~15% water, be sufficiently stirred for
Uniformly it is made reducing agent mixed liquor C；
D, by coating gross mass percentage, weigh 0.15% thickener hydroxyethyl cellulose, be added to 2.5%~15%
Water in, stirring to dissolving be translucent shape and without gel occur i.e. stopping stirring being made thickener mixed liquor D；
E, the inorganic acid mixed liquid B 2 of preparation is added in coating mixed liquor A 2, is subsequently adding reducing agent mixed liquor C and matches somebody with somebody
The 1/5~1/2 of amount processed, adds thickener mixed liquor D while stirring, adds the water of surplus, continues stirring 30~90 minutes, directly
To coating mixed liquor uniformity soilless sticking particle, remaining reducing agent mixed liquor C is finally added, be stirred for 10~40
Minute, obtain final product.
This kind of coating is applied over fin pipe surface by spraying, brushing, dip-coating, and 80 ± 10 DEG C dry 10~60 minutes, 280
± 40 DEG C of solidifications are sintered 30~60 minutes, form good anti-corrosion coating.
The wetting dispersing agent is the SA-20 in peregal series, and described thickener selects hydroxyethyl cellulose；It is described
Defoamer select tributyl phosphate.
Although the present invention is disclosed as above with preferred embodiment, the present invention is not limited to this.Any art technology
Personnel, without departing from the spirit and scope of the present invention, can make various changes or modifications, therefore protection scope of the present invention should
It is defined when by claim limited range.
Claims (5)
1. the heat exchanger tube that a kind of fin axial direction spacing changes, the heat exchanger tube includes base tube and fin, and the fin is multiple, institute
Multiple fins are stated to be spaced apart and arranged on the base tube along the axis direction of the base tube, and each fin is parallel to the base
Between the cross section of pipe, it is characterised in that along the flow direction of base tube fluid, the adjacent fins on the axial direction of base tube
Every distance constantly reduce；
Along the flow direction of base tube fluid, the continuous width for reducing of distance at the fin interval on the axial direction of base tube
Degree constantly increases；
The cross section of described base tube is square, and the substrate tube sets inner fin, and the inner fin connects the right of rectangle
Substrate tube is divided into multiple passage aisles by angle, the inner fin, and intercommunicating pore is set on inner fin, so that adjacent passage aisle
Communicate with each other, described intercommunicating pore is circle, the foursquare a length of L of inner edge, the radius r of the intercommunicating pore, same fin
The distance between upper adjacent intercommunicating pore center of circle is l, meets following relation：
l/L*10=a*ln(r/L*10)+b；
Wherein ln is logarithmic function, and a, b are parameter, 1.45<a<1.62,2.89<b<3.10;
0.33<l/L<0.39;
0.13<r/L<0.18;
30mm<L<140mm；
5mm<r<19mm。
2. the heat exchanger tube that fin axial direction as claimed in claim 1 spacing changes, the fin is multigroup, and multigroup fin is along described
The axis direction of base tube is spaced apart and arranged on the base tube, and every group of fin is parallel to the cross section of the base tube, described
Every group of fin includes two fins, and two described fins are symmetrical along the face where the axis of base tube, the horizontal stroke of described base tube
Cross sectional shape is rectangle, and described fin shape is rectangle, and the first opening and the second opening, institute are formed between described two fins
State the first opening and the second opening symmetrical along the face where the axis of base tube.
3. the heat exchanger tube that fin axial direction as claimed in claim 2 spacing changes, along the flow direction of base tube fluid, in base
The distance at the fins set interval on the axial direction of pipe is constantly reduced.
4. the heat exchanger tube that fin axial direction as claimed in claim 3 spacing changes, along the flow direction of base tube fluid, in base
The amplitude that the distance at the adjacent fins group interval on the axial direction of pipe is constantly reduced constantly increases.
5. the heat exchanger tube that fin axial direction as claimed in claim 1 spacing changes, 14mm<l<43mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610111588.7A CN105651097B (en) | 2016-02-29 | 2016-02-29 | A kind of finned tube of fin axial direction spacing change |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610111588.7A CN105651097B (en) | 2016-02-29 | 2016-02-29 | A kind of finned tube of fin axial direction spacing change |
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| Publication Number | Publication Date |
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| CN105651097A CN105651097A (en) | 2016-06-08 |
| CN105651097B true CN105651097B (en) | 2017-05-31 |
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| CN201610111588.7A Active CN105651097B (en) | 2016-02-29 | 2016-02-29 | A kind of finned tube of fin axial direction spacing change |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108225089B (en) * | 2018-01-09 | 2023-10-24 | 苏州新太铜高效管有限公司 | Condenser tube for reinforcing drainage and oil discharge |
| CN110145956B (en) * | 2019-06-03 | 2024-04-30 | 北京英翔博瑞耐火材料科技有限公司 | Heat exchange device and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1677044A (en) * | 2005-03-17 | 2005-10-05 | 西安交通大学 | Forced heat exchange tube |
| CN201034430Y (en) * | 2007-07-20 | 2008-03-12 | 哈尔滨鑫北源电站设备制造有限公司 | Power boiler H-shaped coal economizer |
| CN201514143U (en) * | 2009-03-23 | 2010-06-23 | 张家港市华东电站锅炉部件制造有限公司 | Fin of H-shaped fin heat exchange tube |
-
2016
- 2016-02-29 CN CN201610111588.7A patent/CN105651097B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1677044A (en) * | 2005-03-17 | 2005-10-05 | 西安交通大学 | Forced heat exchange tube |
| CN201034430Y (en) * | 2007-07-20 | 2008-03-12 | 哈尔滨鑫北源电站设备制造有限公司 | Power boiler H-shaped coal economizer |
| CN201514143U (en) * | 2009-03-23 | 2010-06-23 | 张家港市华东电站锅炉部件制造有限公司 | Fin of H-shaped fin heat exchange tube |
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| CN105651097A (en) | 2016-06-08 |
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Effective date of registration: 20190430 Address after: 435100 Daye Avenue 268, Daye City, Huangshi City, Hubei Province Patentee after: DAYE QIFENG POWER REFRIGERATION EQUIPMENT Co.,Ltd. Address before: 266075 room 0201, block A, 75 Fuzhou South Road, Shinan District, Qingdao, Shandong. Patentee before: Zhao Wei |
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Denomination of invention: A finned tube with variable fin axial spacing Effective date of registration: 20230109 Granted publication date: 20170531 Pledgee: Bank of China Limited Huangshi Branch Pledgor: DAYE QIFENG POWER REFRIGERATION EQUIPMENT Co.,Ltd. Registration number: Y2023420000009 |
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