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EP0072996A1 - Turbulateur en matière thermoplastique - Google Patents

Turbulateur en matière thermoplastique Download PDF

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Publication number
EP0072996A1
EP0072996A1 EP82107441A EP82107441A EP0072996A1 EP 0072996 A1 EP0072996 A1 EP 0072996A1 EP 82107441 A EP82107441 A EP 82107441A EP 82107441 A EP82107441 A EP 82107441A EP 0072996 A1 EP0072996 A1 EP 0072996A1
Authority
EP
European Patent Office
Prior art keywords
inducing member
turbulence inducing
spiral blade
plastic
turbulence
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.)
Withdrawn
Application number
EP82107441A
Other languages
German (de)
English (en)
Inventor
Ohkata Ichizo
Hama Taira
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Piolax Inc
MIHAMA Manufacturing CO Ltd
Original Assignee
MIHAMA Manufacturing CO Ltd
Kato Hatsujo Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MIHAMA Manufacturing CO Ltd, Kato Hatsujo Inc filed Critical MIHAMA Manufacturing CO Ltd
Publication of EP0072996A1 publication Critical patent/EP0072996A1/fr
Withdrawn legal-status Critical Current

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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
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation

Definitions

  • the present invention relates to a plastic turbulence inducing member adapted to be inserted into a pipe for a fluid such as a refrigerant in a heat exchanger etc. for inducing turbulence in the flow of the fluid thereby enhancing the heat-exchange efficiency.
  • Turbulence inducing members made of a metal have been well known to the art. Recently, a turbulence inducing member made of a synthetic resin which is light in weight and easy to manufacture has been proposed.
  • French Patent No. 77.30460 discloses a plastic turbulence inducing member having blades twisted helically. Generally, turbulence inducing members are inserted one by one into cylindrical fluid pipes having an inside diameter equal to the maximum diameter of the turbulence inducing members and, for this reason, the plastic turbulence inducing member as disclosed in the aforementioned French Patent is formed to have its maximum diameter of about 10 mm and is provided with spiral blades less than 1 mm in thickness. Therefore, the spiral blades have sharp leading edges.
  • the spiral blades have slightly rounded portions at the leading edges thereof, these come into acute contact with the inner wall of the fluid pipe when inserted into the fluid pipe.
  • the leading edges of the spiral blades are formed like a knife edge from a macroscopic point of view.
  • the fluid pipe is generally made of a soft metal exhibiting high heat conductivity such as copper, aluminum, etc.
  • the turbulence inducing member When the turbulence inducing member is allowed to rotate and/or vibrate due to the flowing of a fluid through the inside of the fluid pipe, therefore, the sharp leading edges of the spiral blades of the turbulence inducing member are brought into pressure contact with the inner wall of the fluid pipe, then may possibly cause the inner wall of the fluid pipe to be scraped off and, what is worse, the fluid pipe to be broken.
  • a turbulence inducing member is made of a synthetic resin having relatively low rigidity, it brings about a similar phenomenon though there is a difference in degree.
  • the object of the present invention is to provide a plastic turbulence inducing member capable of effectively preventing the inner wall of a fluid pipe to be brought into contact with the leading end portions of spiral blades from being worn off.
  • a plastic turbulence inducing member provided with at least one spiral blade which has the leading end portion thereof formed in the shape of an arc and, more specifically, formed such that the leading edge of the leading end portion is positioned within a circle of a diameter identical with the maximum diameter of the turbulence inducing member.
  • Figure 1 illustrates a conventional turbulence inducing member 10, which is provided with a pair of spiral blades 12 of a straight cross section having equal radial lengths.
  • This turbulence inducing member 10 has disadvantages that repeated rotation and/or vibration of the turbulence inducing member 10 caused by flowing of a fluid, when inserted into a fluid pipe having an inside diameter equal to the maximum diameter of the turbulence inducing member 10, cause the leading edges of the spiral blades 12 to come into pressure contact with the inner wall of the fluid pipe, then scrape off the inner wall of the fluid pipe thereby making the thickness of the fluid pipe thinner and thinner, and consequently break the fluid pipe.
  • the present invention has been accomplished in order to eliminate the disadvantages suffered by the conventional turbulence inducing member and will now be described in detail with reference to the illustrated embodiments.
  • FIG. 2 illustrates one embodiment of a plastic turbulence inducing member according to the present invention.
  • This turbulence inducing member 20 comprises a shaft portion 22 and a pair of spiral blades 24 radially extending from the shaft portion 22 with the thickness thereof held substantially constant.
  • the shaft portion 22 and the blades 24 are integrally molded of a synthetic resin.
  • the leading end portion of each of the blades 24 is bent in an arc form so that the position of the leading edge 26 thereof may fall within a circle P drawn with the maximum diameter of the turbulence inducing member 20 as its diameter, i.e. a circle having a radius of the distance between the center of the shaft portion 22 and the outermost side of the spiral blade 24.
  • a turbulence inducing member 20 when the diameter of the circle P is set at 7 mm, the diameter of the shaft portion 22 at 1.5 mm, the thickness of the spiral blades 24 at 0.6 mm and the length d of the arc-shaped leading end portion of the spiral blade 24 at 3 mm, for example.
  • a mouthpiece having an outlet of a shape identical with the cross section of the turbulence inducing member as illustrated in Figure 2(A) is rotatably attached to an extruding machine.
  • a softened resin is extruded from the outlet by the extruding machine with the mouthpiece rotated.
  • the extruded resin is spirally twisted by the rotation of the mouthpiece, passed through water in a cooling vessel to be cooled and hardened, and drawn from the cooling vessel.
  • the hardened resin is cut into members to have a suitable length.
  • the softened resin may be drawn by rotating the resin itself while fixing the mouthpiece onto the extruding machine.
  • FIG. 3 illustrates another embodiment of a plastic turbulence inducing member according to the present invention.
  • the turbulence inducing member 20 in this embodiment comprises a shaft portion 22 and a spiral blade 24 radially extending straight from the shaft portion and further extending so that the leading end portion is bent in an arc form and the position of the leading edge 26 falls within the circle P as in the preceding embodiment.
  • the number of the spiral blades 24 is not particularly limited. That is to say, three or more spiral blades 24 may be formed integrally with the shaft portion 22.
  • the leading end portion of the spiral blade 24 may be bent in either direction irrespective of the direction in which the spiral blade 24 is twisted relative to the shaft portion 22 of the turbulence inducing member 20.
  • Figure 4 illustrates a still another embodiment of a turbulence inducing member according to the present invention.
  • a swollen portion 30 is formed integrally with the straight leading end portion 28 of a spiral blade 24.
  • the swollen portion 30 has an arc-shaped outer circumference of a diameter not less than two times of the thickness of the straight leading end portion 28 of the spiral blade 24.
  • the sharp leading edge of the spiral blade 12 of the conventional turbulence inducing member 10 comes into sharp contact with the inner wall 32 of the fluid pipe as illustrated in Figure 5(A).
  • the sharp leading edge of the spiral blade 12 is brought into pressure contact with the inner wall 32 of the fluid pipe and consequently scrapes off the inner wall 32 at the specific portions thereof.
  • the turbulence inducing member 10 though having the blades twisted spirally, has the spiral blades 12 extending straight from the shaft portion over the entire length thereof, the spiral blades 12 themselves do not exhibit elasticity in the direction of the shaft portion.
  • the sharp leading edges of the straight extending spiral blades 12 come into linear contact with the inner wall 32.
  • the rotation and/or vibration of the turbulence inducing member 10 accompanied by the flowing of the fluid inevitably causes the sharp leading edge to scrape the inner wall 32 off.
  • the corner formed between the rounded surface and the side wall of the spiral blade 12 has an angle of approximately ninety degrees and the thickness of the spiral blade 12 is very small. In this case, therefore, the corner is brought into sharp contact with the inner wall 32 of the fluid pipe and the inner wall 32 is scraped off similarly to the case in Figure 5(A).
  • the leading end portion of the spiral blade 24 comes into curved-surface contact with the inner wall 32 of the fluid pipe, as illustrated in Figure 6.
  • This curved-surface contact can prevent the inner wall 32 of the fluid pipe from being worn off to the maximum extent.
  • the leading edge 26 of the arc-shaped leading end portion of the spiral blade 24 is positioned within the circle P of a diameter identical with the maximum diameter of the turbulence inducing member 20, it does not come into direct contact with the inner wall of the fluid pipe.
  • the arc-shaped circumferential surface of the leading end portion having large curvature comes into contact with the inner wall 32 of the fluid pipe. Therefore, the contact between the leading end portion of the spiral blade 24 and the inner wall 32 of the fluid pipe is elastically maintained at all times. Even though the turbulence inducing member 20 is allowed to rotate and/or vibrate by the flow of the fluid, the leading edge 26 of the spiral blade 24 is elastically bent in the direction of the arrow A in Figure 6, i.e. in the direction of the shaft portion 22 of the turbulence inducing member 20, and therefore desired curved-surface contact is maintained at all times. According to the present invention, therefore, there is no fear of the leading edge of the spiral blade scraping off the inner wall 32 of the fluid pipe as has been done by the conventional turbulence inducing member.
  • the leading end portion of the spiral blade is formed in the shape of an arc and comes into curved-surface contact with the inner wall of the fluid pipe, it is possible to effectively prevent the inner wall of the fluid pipe from being worn off and scraped off. Further, since the formation of the leading end portion of the spiral blade to be bent or to be provided with the swollen portion having the arc-shaped outer circumference can afford more vigorous turbulence than in the past to the flow of the fluid, the heat-exchange efficiency is further enhanced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
EP82107441A 1981-08-19 1982-08-16 Turbulateur en matière thermoplastique Withdrawn EP0072996A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP12268281U JPS5827689U (ja) 1981-08-19 1981-08-19 合成樹脂製乱流子
JP122682/81U 1981-08-19

Publications (1)

Publication Number Publication Date
EP0072996A1 true EP0072996A1 (fr) 1983-03-02

Family

ID=14842011

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82107441A Withdrawn EP0072996A1 (fr) 1981-08-19 1982-08-16 Turbulateur en matière thermoplastique

Country Status (2)

Country Link
EP (1) EP0072996A1 (fr)
JP (1) JPS5827689U (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3325230A1 (de) * 1983-07-13 1985-03-07 Heinz Schilling KG, 4152 Kempen Verfahren zur verbesserung der waermeuebertragung in wasser/sole-luft-waermetauscher fuer kreislaufverbundene waermerueckgewinnungsanlagen oder sinngemaess fuer andere bereiche
FR2570002A1 (fr) * 1984-09-10 1986-03-14 Elf France Dispositif pour le nettoyage de tubes
EP0257220A1 (fr) * 1986-07-31 1988-03-02 Perfils Tecnics, S.A. "Pertecsa" Turbulateur pour tubes d'échange de chaleur
FR2614407A1 (fr) * 1987-04-21 1988-10-28 Valeo Turbulateur pour tube d'echangeur de chaleur, notamment pour vehicule automobile
WO1991000338A1 (fr) * 1989-06-27 1991-01-10 Unilever Plc Matriçage des barres de savon
GB2280256A (en) * 1993-07-23 1995-01-25 Graeme Donald Marshall Fluid channelling member for use in heat transfer tubes
DE4325193A1 (de) * 1993-07-27 1995-02-02 Hoecker Hans Peter Dipl Ing Vorrichtung zum Austausch von Wärme
DE29516927U1 (de) * 1995-10-26 1996-02-01 SGL Technik GmbH, 86405 Meitingen Rohr für Wärmeaustauscher mit wirbelerzeugenden Stromstörungselementen
WO2005088200A1 (fr) * 2004-03-18 2005-09-22 Danfoss A/S Echangeur de chaleur
US7370488B2 (en) * 2005-03-09 2008-05-13 Kelix Heat Transfer Systems, Llc Geo-thermal heat exchanging system facilitating the transfer of heat energy using coaxial-flow heat exchanging structures installed in the earth for introducing turbulence into the flow of the aqueous-based heat transfer fluid flowing along the outer flow channel
CN102645122A (zh) * 2012-05-18 2012-08-22 北京化工大学 换热管内开槽螺旋卷边转子

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63156994A (ja) * 1986-12-19 1988-06-30 Dai Ichi High Frequency Co Ltd 長手方向に微細な波状表面を有する襞型伝熱管

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR385536A (fr) * 1907-12-24 1908-05-15 Nicolas Taboulevitch Chaudière à vaporisation instantanée
US1672617A (en) * 1922-08-12 1928-06-05 Lasker George Boiler
FR1082949A (fr) * 1952-07-08 1955-01-04 Perfectionnements aux moyens d'échange thermique entre ? en particulier aux tubes àfumées ou à flammes
FR2244149A1 (en) * 1973-09-18 1975-04-11 Ferodo Sa Helical static agitator for heat exchanger tube - has strip of material formed into helix with an O.D. less than tube I.D.
US4190105A (en) * 1976-08-11 1980-02-26 Gerhard Dankowski Heat exchange tube
FR2436959A1 (fr) * 1978-09-19 1980-04-18 Ferodo Sa Perfectionnements apportes aux echangeurs de chaleur tubulaires et aux agitateurs destines a de tels echangeurs
FR2442421A1 (fr) * 1978-11-24 1980-06-20 Ferodo Sa Perfectionnements apportes aux echangeurs de chaleur tubulaires et aux agitateurs destines a de tels echangeurs

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR385536A (fr) * 1907-12-24 1908-05-15 Nicolas Taboulevitch Chaudière à vaporisation instantanée
US1672617A (en) * 1922-08-12 1928-06-05 Lasker George Boiler
FR1082949A (fr) * 1952-07-08 1955-01-04 Perfectionnements aux moyens d'échange thermique entre ? en particulier aux tubes àfumées ou à flammes
FR2244149A1 (en) * 1973-09-18 1975-04-11 Ferodo Sa Helical static agitator for heat exchanger tube - has strip of material formed into helix with an O.D. less than tube I.D.
US4190105A (en) * 1976-08-11 1980-02-26 Gerhard Dankowski Heat exchange tube
FR2436959A1 (fr) * 1978-09-19 1980-04-18 Ferodo Sa Perfectionnements apportes aux echangeurs de chaleur tubulaires et aux agitateurs destines a de tels echangeurs
FR2442421A1 (fr) * 1978-11-24 1980-06-20 Ferodo Sa Perfectionnements apportes aux echangeurs de chaleur tubulaires et aux agitateurs destines a de tels echangeurs

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3325230A1 (de) * 1983-07-13 1985-03-07 Heinz Schilling KG, 4152 Kempen Verfahren zur verbesserung der waermeuebertragung in wasser/sole-luft-waermetauscher fuer kreislaufverbundene waermerueckgewinnungsanlagen oder sinngemaess fuer andere bereiche
FR2570002A1 (fr) * 1984-09-10 1986-03-14 Elf France Dispositif pour le nettoyage de tubes
EP0176419A1 (fr) * 1984-09-10 1986-04-02 ELF FRANCE, Société Anonyme dite: Dispositif pour le nettoyage de tubes
EP0257220A1 (fr) * 1986-07-31 1988-03-02 Perfils Tecnics, S.A. "Pertecsa" Turbulateur pour tubes d'échange de chaleur
FR2614407A1 (fr) * 1987-04-21 1988-10-28 Valeo Turbulateur pour tube d'echangeur de chaleur, notamment pour vehicule automobile
WO1991000338A1 (fr) * 1989-06-27 1991-01-10 Unilever Plc Matriçage des barres de savon
AU635291B2 (en) * 1989-06-27 1993-03-18 Unilever Plc Bar stamping
US5236654A (en) * 1989-06-27 1993-08-17 Lever Brothers Company Bar stamping
GB2280256A (en) * 1993-07-23 1995-01-25 Graeme Donald Marshall Fluid channelling member for use in heat transfer tubes
DE4325193A1 (de) * 1993-07-27 1995-02-02 Hoecker Hans Peter Dipl Ing Vorrichtung zum Austausch von Wärme
DE29516927U1 (de) * 1995-10-26 1996-02-01 SGL Technik GmbH, 86405 Meitingen Rohr für Wärmeaustauscher mit wirbelerzeugenden Stromstörungselementen
WO2005088200A1 (fr) * 2004-03-18 2005-09-22 Danfoss A/S Echangeur de chaleur
US7370488B2 (en) * 2005-03-09 2008-05-13 Kelix Heat Transfer Systems, Llc Geo-thermal heat exchanging system facilitating the transfer of heat energy using coaxial-flow heat exchanging structures installed in the earth for introducing turbulence into the flow of the aqueous-based heat transfer fluid flowing along the outer flow channel
US8161759B2 (en) 2005-03-09 2012-04-24 Kelix Heat Transfer Systems, Llc Method of and apparatus for transferring heat energy between a heat exchanging subsystem above the surface of the earth and material therebeneath using one or more coaxial-flow heat exchanging structures producing turbulence in aqueous-based heat-transfering fluid flowing along helically-extending outer flow channels formed therein
CN102645122A (zh) * 2012-05-18 2012-08-22 北京化工大学 换热管内开槽螺旋卷边转子

Also Published As

Publication number Publication date
JPS5827689U (ja) 1983-02-22

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT

STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Withdrawal date: 19830609

RIN1 Information on inventor provided before grant (corrected)

Inventor name: ICHIZO, OHKATA

Inventor name: TAIRA, HAMA