CN101915514B - Semi-open-type rotor - Google Patents
Semi-open-type rotor Download PDFInfo
- Publication number
- CN101915514B CN101915514B CN2010102463584A CN201010246358A CN101915514B CN 101915514 B CN101915514 B CN 101915514B CN 2010102463584 A CN2010102463584 A CN 2010102463584A CN 201010246358 A CN201010246358 A CN 201010246358A CN 101915514 B CN101915514 B CN 101915514B
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- rotor
- open
- semi
- hollow shaft
- primary blades
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- 230000004323 axial length Effects 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 239000012530 fluid Substances 0.000 abstract description 33
- 230000000694 effects Effects 0.000 abstract description 21
- 230000003416 augmentation Effects 0.000 description 12
- 239000000725 suspension Substances 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention provides a semi-open-type rotor which comprises a hollow shaft, a main blade and an auxiliary blade. The main blade and the auxiliary blade are arranged on the outer surface of the hollow shaft, the main blade has a longer axial length, the main blade at the rear end of the rotor is suspended to form a semi-open-type structure which is axially overlapped with the front end of an adjacent rotor in use, radially forms a gap or is radially matched with the front end of an adjacent rotor, the radial width of the front part of the main blade on the hollow shaft is smaller than the radial width of the rear part, the front part of the main blade has a small rotary diameter, the rear end part of the main blade has a larger rotary external diameter, and the auxiliary blade is arranged at the front end of the rotor and has a shorter axial length. The front part of the main blade of the rotor has the small rotary diameter to take the effect of spoiling central fluid of a heat exchange pipe and scattering the central fluid around, the rear part of the main blade, which has the larger rotary external diameter, has good flow spoiling effect on the boundary layer fluid of an inner laminar flow of the heat exchange pipe and can adjust the rotor-driving torque of the fluid by adjusting the axial length of the auxiliary blade so as to enhance the fluid-adapting performance of the rotor.
Description
Technical field
What the present invention relates to is a kind of interior inserted component that is applied to augmentation of heat transfer and antiscaling, descaling in the heat exchanger tube in the equipment such as shell-and-tube heat exchanger, heat exchange reactor.
Background technology
Current; Energy-saving and emission-reduction are the key technologies that the whole world is all paid much attention to, and all will be applied to many heat exchangers in various fields such as oil, chemical industry, thermoelectricity, nuclear power, metallurgy, light industry, aviation device and boats and ships vehicles, and wherein using is shell-and-tube heat exchanger the most widely; But inwall ubiquity lamination dirt in these heat exchanger tubes; Cause fluid transporting resistance in pipeline to increase, meeting blocking pipe when serious, heat transfer property greatly descends simultaneously; Dirt can seriously reduce heat transfer efficiency and cause great energy waste in the heat exchanger tube; Meanwhile dirt generally has corrosivity; Therefore corrosion of tube wall meeting causes great potential safety hazard if leakage flow is known from experience, and therefore is compelled exactly to take to stop production to clean in treating method traditionally; So not only stopped over the manufacturing schedule of factory, also need pay expensive cleaning charge simultaneously and use; In order to address these problems better, people study the on-line automatic augmentation of heat transfer that employing do not stop production and the various ways and the device of descaling and antiscaling always.Occurred many antiscaling, descaling method and apparatus in recent years, one of them utilizes fluid to promote the method that the spiral band energy of rotation is realized online automatic desludging, and the spiral band one Chinese patent application number is: ZL95236063.2; Name is called the innovation and creation of " cleaning device of descaling and antiscaling in the heat-transfer pipe "; The technical scheme of these innovation and creation is made up of the tie that is equipped with in the heat exchanger tube with heat exchanger tube cardinal principle equal length, and the radial dimension of tie is less than the internal diameter of heat exchanger tube, and the place is provided with the axial restraint frame at the heat exchanger tube inlet; There is inlet opening the position, intermediate portion; The head of axial restraint frame has an axis hole, and bearing pin is housed in it, and the bearing pin afterbody also is connected with tie; Denomination of invention is " spiral enhanced heat exchange of dual turbulent and an automatic descaling apparatus "; The one Chinese patent application publication number is CN1424554; This device is as augmentation of heat transfer and automatic desludging thereof; Include spiral band, fixed mount, spiral band is arranged in the helix tube, utilizes through the mobile spiral band that drives of heat exchanger tube inner fluid and rotates.Because spiral band is a whole band, heat exchanger tube can produce uneven slit through straight inadequately after the installation and processing between spiral band and the heat exchanger tube inwall, and the scale removal effect of tie is little and inhomogeneous like this, and descale effect is undesirable.In the spiral band method apparatus for eliminating sludge, spiral band all is single-ended fixing, and the other end freely swings, and the radial dimension of tie is less than the internal diameter of heat-transfer pipe.Comprehensively once spiral band has following major defect: (1) tie is an integral body, heat-transfer pipe is directly swiped damage heat exchanger tube inwall; Promoting the tie rotation when (2) fluid flows needs bigger driving moment, consumes more fluid kinetic energy; (3) service life of the bearing of single-ended fixedly usefulness is short; (4) the field cooperative reinforcing heat-transfer effect of tie generation is not remarkable.Chinese patent number is ZL200520127121.9 afterwards; The patent application of denomination of invention for " rotator type cleaning and heat-transfer enhancing device " disclosed; This device is to be made up of fixed mount, rotor, flexible shaft and stay pipe, and two fixed mounts are separately fixed at the two ends of heat exchanger tube; The outer surface of rotor has scroll, and centre bore is arranged on the rotor; Bracing frame is located between rotor and the fixed mount, and flexible shaft passes the centre of rotor hole and stay pipe is fixed on two fixed mounts.This device has the function of on-line automatic antiscaling, descaling and augmentation of heat transfer, under the situation of fluid following current or adverse current in heat-transfer pipe, the effect of antiscaling, descaling and augmentation of heat transfer is arranged all.But shortcoming be certain fluid through the time, the rotary speed of rotor is that the lead angle by the spiral shell rib determines that fast in the rotary speed of spiral shell rib helical pitch hour rotor, the resistance of convection cell increases thereupon simultaneously; Be head it off, one Chinese patent application numbers 200620172805.5, denomination of invention are " low flow resistance rotor of cleaning and heat-transfer enhancing in the heat-transfer pipe "; This device is by rotor, bracing frame and is connected axis and constitutes that bracing frame is fixed on the heat-transfer pipe two ends, and the two ends that connect axis are separately fixed on the bracing frame; A plurality of rotors are installed on and connect on the axis, and rotor is to be made up of hollow shaft and blade, and it is same skewed that each blade becomes with hollow shaft; Adjacent blades is end to end, and this structure convection cell resistance reduces, and fluid is good through performance; But its velocity of rotation is higher, and the stack of rotor axial power is bigger to the active force of suspension member and axis, and the rotating shaft life-span can reduce; The flow-disturbing degree of core flow is not high enough in the above-described rotor blade exchange heat pipe; The fluid temperature (F.T.) in core flow and heat exchanger tube boundary layer differs bigger in the heat exchanger tube, does not realize that all fluids can both have good heat exchange effect with the shell medium in the heat exchanger tube, and the radial width of blade does not change on axial direction simultaneously; The degree of mixing of central core fluid and laminar flow layer fluid is good inadequately in the heat exchanger tube, has limited the augmentation of heat transfer of rotor and the effect of antiscaling, descaling ability.
Summary of the invention
The objective of the invention is to design a kind of rotor of new construction, adopted the primary blades of different length and the combination of auxilliary blade to be arranged on the hollow shaft, guarantee that core flow flows to the heat exchanger tube inwall in the heat exchanger tube, improve the augmentation of heat transfer and the antiscaling, descaling performance of rotor energetically.
The particular content of technical scheme of the present invention is: a kind of semi-open-type rotor, and it comprises hollow shaft, primary blades and auxilliary blade, the hollow shaft internal diameter is greater than the external diameter of rotating shaft; Primary blades and auxilliary blade are arranged on the hollow shaft outer surface, and the primary blades axial length is longer, and the primary blades of rotor rear end is unsettled; Form the semi-open-type structure, with use in the front end of adjacent rotor axially go up overlaid, directly upwards have the gap or cooperate, primary blades forward part radial width is less than the radial width of rear section on the hollow shaft; Primary blades forward part rotating diameter is little, plays the effect of flow-disturbing heat exchanger tube core flow, around core flow is distributed to; Primary blades rear end part rotation external diameter is bigger, and is less with heat exchanger tube inwall distance, better breakable layer fluid layer fluid; Strengthen the effect of antiscaling, descaling and augmentation of heat transfer, auxilliary blade is arranged on the rotor front end, and axial length is shorter; Main effect is the effect of core flow in the flow-disturbing heat exchanger tube, makes core flow to disperseing all around, strengthens the turbulent extent of fluid; The temperature difference of core flow is less in heat exchanger tube inwall fluid and the heat exchanger tube, thereby has improved the heat transfer intensity of heat exchanger tube inner fluid.
The hollow shaft of a kind of semi-open-type rotor of the present invention is open circles taper, hollow cylinder, hollow nodal figure or hollow many prismatics; On primary blades and the auxilliary blade hollow structure can be set; Reduce the flow resistance of blade convection cell, energy savings can also be saved material simultaneously.
The hollow shaft two ends of a kind of semi-open-type rotor of the present invention are provided with coaxial configuration; Several are installed on the rotor in the rotating shaft between two suspension members; The hollow shaft two ends of its rotor are provided with coaxial configuration, and the head of the hollow shaft afterbody of two one of them rotors of adjacent rotors and the hollow shaft of another rotor combines.The hollow shaft coaxial configuration of rotor can be ball-and-socket mode, circular cone mode, buckle mode or universal joint mode.
The primary blades of a kind of semi-open-type rotor of the present invention, auxilliary blade and hollow shaft are by macromolecular material, polymer-based composite, metal or ceramic material.
The shape of the primary blades of a kind of semi-open-type rotor of the present invention and the cross section of auxilliary blade is rectangle, trapezoidal or circular arc, and primary blades and auxilliary blade can be scroll.
The different blade composite fabricated rotor of axial length in the heat exchanger tube that the present invention relates to; It is a kind of semi-open-type rotor; Parameters such as the axial length of primary blades and auxilliary blade, lead angle and rotation outside diameter; Can and make processing cost and wait to confirm according to condition of work such as velocity of medium and temperature in heat exchanger tube internal diameter, the pipe, can take rotation or independent rotational structure synchronously between the adjacent rotor.
The invention has the beneficial effects as follows: 1, on the hollow shaft primary blades forward part radial width less than the radial width of rear section; Primary blades forward part rotating diameter is little; Play the effect of flow-disturbing heat exchanger tube core flow, around core flow was distributed to, primary blades rear section rotation external diameter was bigger; The flow-disturbing effect of heat exchanging inner tube layer laminar boundary layer fluid is better, plays the effect of augmentation of heat transfer and antiscaling, descaling; 2, auxilliary blade is arranged on rotor hollow shaft first half, cooperates with primary blades, improves the effect of rotor flow-disturbing core flow, disperses core flow in the heat exchanger tube around heat exchanger tube, to strengthen the heat exchange effect of core flow; 3, auxilliary axis of runner blade length is less, has reduced the resistance of rotor convection cell, the material cost of saving rotor simultaneously; 4, the axial length that can adjust auxilliary blade is adjusted the driving moment of fluid to rotor, has strengthened the performance of rotor adaptation fluid like this.
A kind of semi-open-type rotor of the present invention is installed in the heat exchanger tube, according to concrete heat exchanger tube length, with rotating shaft with several rotor inlines together; Be through in the heat exchanger tube; Countershaft carries out axial restraint at the heat exchanger tube two ends to utilize the suspension member be fixed on the heat exchanger tube end simultaneously, when fluid flows through primary blades and auxilliary blade, rotor is had the tangential force perpendicular to radially; Rotor is rotated around the shaft, and rotor plays the effect of antiscaling, descaling on will the heat exchanging inside pipe wall; The rotor hollow shaft is provided with different primary blades of length and auxilliary blade; The radial width of primary blades is axially changing on the length simultaneously; Core flow in the blade flow-disturbing heat exchanger tube of small diameter portion; The fluid of the laminar boundary layer of the blade flow-disturbing heat exchanger tube inwall of major diameter part, the primary blades overhanging portion matches with the rotor head of small diameter blades, has strengthened the flow-disturbing degree of rotor convection cell like this; Make the fluid temperature difference of heat exchanger tube core flow and heat exchanger tube inwall become very little, play the effect that strengthens antiscaling, descaling and augmentation of heat transfer.Simultaneously can also be according to actual needs, hollow structure on primary blades and auxilliary blade, the resistance of reduction rotor fluid flow, the material and the Costco Wholesale of having saved rotor.
Description of drawings
Fig. 1 is a kind of semi-open-type rotor of the present invention---quaterfoil rotor structure sketch map.
Fig. 2 is the right view of Fig. 1.
Fig. 3 is a kind of semi-open-type rotor of the present invention---six leaf formula rotor structure sketch mapes (3 primary blades and 3 auxilliary blades).
Fig. 4 is a kind of semi-open-type rotor of the present invention---six leaf formula rotor structure sketch mapes (2 primary blades and 4 auxilliary blades).
Fig. 5 is a kind of semi-open-type rotor of the present invention---six leaf formula rotor structure sketch mapes (4 primary blades and 2 auxilliary blades).
Fig. 6 is a kind of semi-open-type rotor of the present invention---quaterfoil rotor hollow structure sketch map.
Fig. 7 is a kind of semi-open-type rotor installation application of the present invention sketch map.
Among the figure: the 1-primary blades, 2-assists blade, 3-hollow shaft, 4-ball-and-socket boss, 5-ball-and-socket concave station, 6-overhanging portion, 7-hollow structure, 8-heat exchanger tube, 9-suspension member, 10-rotating shaft, 11-liquid film.
The specific embodiment
As shown in Figure 7; The present invention relates to a kind of a kind of examples of implementation of semi-open-type rotor, a kind of semi-open-type rotor of the present invention, suspension member 9 and rotating shaft 10 are installed in the heat exchanger tube 8, several said rotors are installed in the rotating shaft 10 of 9 of two suspension members; Suspension member 9 is fixed on heat exchanger tube 8 two ends; The two ends of rotating shaft 10 are separately fixed on the suspension member 9, and said rotor is to be fixed on above the hollow shaft 3 with auxilliary blade 2 combinations by the different primary blades 1 of length, and the radial width of primary blades 1 changes in the axial direction; And the primary blades 1 of rotor rear section is provided with overhanging portion 6, can match with adjacent said rotor front end.
Fig. 1 is to shown in Figure 6, and the hollow shaft 3 of rotor of the present invention is a hollow cylinder; Among Fig. 1 and Fig. 2, rotor hollow shaft 3 is provided with two primary blades 1 and two auxilliary blades 2; The structural representation that is provided with six blades of three primary blades 1 and three auxilliary blades 2 for rotor hollow shaft 3 shown in Figure 3; Shown in Figure 4, be six leaf formula rotor structure sketch mapes of two primary blades 1 and four auxilliary blades 2; Fig. 5 is four primary blades 1 and two auxilliary blade 2 six leaf formula rotor structure sketch mapes.Hollow shaft 3 two ends of rotor are provided with coaxial configuration; Coaxial configuration is to be respectively arranged with ball-and-socket boss 4 and ball-and-socket concave station 5 at the head of each hollow shaft 3 and afterbody in this instance; Several said rotors are installed in two rotating shafts 10 between the suspension member 9, and ball-and-socket boss 4 and another ball-and-socket concave station 5 that its hollow shaft 3 two ends are provided with hollow shaft 3 heads of ball-and-socket boss 4 and 5, two one of them rotors of adjacent rotor of ball-and-socket concave station combine; The friction that the liquid film 11 that forms between faying face reduces between rotor; Thereby mutual wearing and tearing when reducing rotor rotation, in addition, another purpose of coaxial configuration is to make adjacent rotor when work, keep coaxial; Has the flexible connecting structure that adapts to heat exchanger tube 8 bendings simultaneously; Coaxial configuration can also be circular cone mode, buckle mode or universal joint mode except socket arrangement, can directly adopt planar structure when axiality is less demanding.On the primary blades 1 of rotor shown in Figure 6 hollow structure 7 is arranged.
When the heat exchanger tube inner fluid flows through the blade of minor diameter of a kind of semi-open-type rotor forward part of the present invention; Fluid receives rotor blade to act as rotation direction to flow; Around rotor, strengthen the turbulent extent of fluid by core flow dispersion in the heat exchanger tube, the exchange that promotes core flow and near heat exchanger tube 8 fluids is with mobile; The external diameter surface of rotor rear section blade is less from the distance of heat exchanger tube inwall; The laminar boundary layer of disturbance heat exchanger tube inwall effectively improves the effect of antiscaling, descaling and augmentation of heat transfer, and while rotor rear section overhanging portion 6 can cooperate with the preceding subdivision of adjacent commentaries on classics; Further utilize the turbulent extent of rotor increasing fluid, improve the effect of rotor augmentation of heat transfer.
Claims (8)
1. a semi-open-type rotor comprises hollow shaft, primary blades and auxilliary blade, and the hollow shaft internal diameter is greater than the external diameter of rotating shaft; Primary blades and auxilliary blade are arranged on the hollow shaft outer surface, it is characterized in that: the primary blades axial length is longer, and the primary blades of rotor rear end is unsettled; Form the semi-open-type structure, with use in the front end of adjacent rotor axially go up overlaid, directly upwards have the gap or cooperate, primary blades forward part radial width is less than the radial width of rear section on the hollow shaft; Primary blades forward part rotating diameter is little, and primary blades rear end part rotation external diameter is bigger, and is less with heat exchanger tube inwall distance; Auxilliary blade is arranged on the rotor front end, and axial length is shorter.
2. a kind of semi-open-type rotor according to claim 1 is characterized in that: the hollow shaft of rotor is open circles taper, hollow cylinder, hollow nodal figure or hollow many prismatics.
3. a kind of semi-open-type rotor according to claim 1 is characterized in that: the hollow shaft two ends of rotor are provided with coaxial configuration, and the head of the afterbody of the hollow shaft of two one of them rotors of adjacent rotors and the hollow shaft of another rotor combines.
4. a kind of semi-open-type rotor according to claim 3 is characterized in that: coaxial configuration can be ball-and-socket mode, circular cone mode, buckle mode or universal joint mode.
5. a kind of semi-open-type rotor according to claim 1 is characterized in that: the primary blades of rotor, auxilliary blade and hollow shaft are by macromolecular material, polymer-based composite, metal or ceramic material.
6. a kind of semi-open-type rotor according to claim 1 is characterized in that: the shape of the cross section of primary blades and auxilliary blade is rectangle, trapezoidal or circular arc.
7. a kind of semi-open-type rotor according to claim 1 is characterized in that: on primary blades and the auxilliary blade hollow structure can be set.
8. a kind of semi-open-type rotor according to claim 1 is characterized in that: primary blades and auxilliary blade can be scroll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102463584A CN101915514B (en) | 2010-08-06 | 2010-08-06 | Semi-open-type rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102463584A CN101915514B (en) | 2010-08-06 | 2010-08-06 | Semi-open-type rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101915514A CN101915514A (en) | 2010-12-15 |
| CN101915514B true CN101915514B (en) | 2012-03-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102463584A Expired - Fee Related CN101915514B (en) | 2010-08-06 | 2010-08-06 | Semi-open-type rotor |
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| Country | Link |
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| CN (1) | CN101915514B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102161045B (en) * | 2011-01-13 | 2012-11-14 | 清华大学 | Self-supporting and self-rotating cleaning and scale-removing element in pipe |
| CN102128560B (en) * | 2011-04-19 | 2012-10-17 | 北京化工大学 | Twisted belt type pendant in heat exchange pipe |
| CN103411468B (en) * | 2013-08-05 | 2015-01-14 | 北京化工大学 | Center spring and helical blade rotor in heat exchange tube |
| CN103432981B (en) * | 2013-08-27 | 2015-05-27 | 北京化工大学 | Energy-saving high-efficiency self-cleaning polymerizing device |
| CN105135932A (en) * | 2015-10-12 | 2015-12-09 | 郑州大学 | Low-flow-resistance rotor for reinforcing heat transfer and scale removal/prevention in heat exchange tube |
| CN105371671A (en) * | 2015-11-10 | 2016-03-02 | 南京华夏壹泰节能科技有限公司 | Modular low flow resistance diversion type hanging part |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5485880A (en) * | 1992-10-29 | 1996-01-23 | Gerstenberg & Agger A/S | Blade system for a scraped surface heat exchanger |
| CN201000303Y (en) * | 2006-12-29 | 2008-01-02 | 北京华夏英蓝科技发展有限公司 | Self-cleaning intensify heat transfer low flow resistance rotor in heat transfer pipe |
| CN101551214A (en) * | 2008-04-03 | 2009-10-07 | 北京化工大学 | Rotating piece type automatic-cleaning and heat-transfer enhancing device |
| CN201368695Y (en) * | 2009-02-20 | 2009-12-23 | 北京华夏英蓝科技发展有限公司 | Unit combined-type enhanced heat transfer device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6222996A (en) * | 1985-07-22 | 1987-01-31 | Toshiba Corp | Multi-tubular heat exchanger |
| EP1136621B1 (en) * | 2000-03-14 | 2007-01-17 | Walzen Irle GmbH | Rotary roller |
-
2010
- 2010-08-06 CN CN2010102463584A patent/CN101915514B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5485880A (en) * | 1992-10-29 | 1996-01-23 | Gerstenberg & Agger A/S | Blade system for a scraped surface heat exchanger |
| CN201000303Y (en) * | 2006-12-29 | 2008-01-02 | 北京华夏英蓝科技发展有限公司 | Self-cleaning intensify heat transfer low flow resistance rotor in heat transfer pipe |
| CN101551214A (en) * | 2008-04-03 | 2009-10-07 | 北京化工大学 | Rotating piece type automatic-cleaning and heat-transfer enhancing device |
| CN201368695Y (en) * | 2009-02-20 | 2009-12-23 | 北京华夏英蓝科技发展有限公司 | Unit combined-type enhanced heat transfer device |
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| CN101915514A (en) | 2010-12-15 |
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Granted publication date: 20120321 |