EP0077130A1 - Turbulence inducing members - Google Patents

Turbulence inducing members Download PDF

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Publication number
EP0077130A1
EP0077130A1 EP82304794A EP82304794A EP0077130A1 EP 0077130 A1 EP0077130 A1 EP 0077130A1 EP 82304794 A EP82304794 A EP 82304794A EP 82304794 A EP82304794 A EP 82304794A EP 0077130 A1 EP0077130 A1 EP 0077130A1
Authority
EP
European Patent Office
Prior art keywords
turbulence inducing
inducing member
turbulence
fluid
pipe
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Withdrawn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
EP82304794A
Other languages
German (de)
French (fr)
Inventor
Ichizo Ohkata
Taira Hama
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 EP0077130A1 publication Critical patent/EP0077130A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/02—Influencing flow of fluids in pipes or conduits
    • F15D1/06—Influencing flow of fluids in pipes or conduits by influencing the boundary layer
    • F15D1/065—Whereby an element is dispersed in a pipe over the whole length or whereby several elements are regularly distributed in a pipe
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4314—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor with helical baffles
    • 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

  • This invention relates to turbulence inducing members for insertion into a pipe for a fluid such as a refrigerant in various kinds of air conditioning systems for inducing turbulence in the flow of the fluid thereby enhancing the heat exchange efficiency
  • French patent no: 77.30460 discloses a plastics turbulence inducing member which is provided with a pair of equal helical ribs and having its maximum outside diameter slightly smaller than the inside diameter of the pipe into which it is to be inserted. Since such a plastics turbulence inducing member is a loose fit in the fluid pipe, it vibrates within the fluid pipe in the direction of fluid flow and/or is rotated around its axis by the flow of the fluid, which leads to a disadvantageous decrease in efficiency in the production of turbulence.
  • the main object of the present invention is to provide a plastics turbulence inducing member which is neither vibrated nor rotated within the fluid pipe by the flow of the fluid, thereby preventing the generation of noise and enhancing the turbulence inducing efficiency.
  • a plastics turbulence inducing member having at least two helical ribs is characterised in that one of the ribs has a radial extent different from that of the other rib or ribs.
  • Figure 1 shows a conventional turbulence inducing member 10 made of a synthetic resin and provided with two helical ribs 12 and 14 which are equal in radial extent.
  • the turbulence inducing member 10 formed by the two ribs 12 and 14 has a maximum diameter which is slightly smaller than the inside diameter of a pipe 16 for fluid so that it may easily be inserted intc the pipe 16.
  • the turbulence inducing member 10 is vibrated in the direction in which the fluid flows and/or rotated around its axis by the flow of the fluid, with the result, that the turbulence induced in the fluid is reduced by the amount of the vibrating movement and/or rotating movement and, at the same time, the vibration and/or rotation of the turbulence inducing member 10 allows the member to rattle against the inner wall of the pipe 16 to thereby make noise.
  • the turbulence inducing member 20 shown in Figures 2 and 3 comprises a shaft portion 22 and two helical ribs 24 and 26 of different radial extents which have curved leading end portions 24a and 26a, with pointed leading edges.
  • the maximum width L of the turbulence inducing member 20 at any point is smaller than the inside diameter of a fluid pipe 30 to be described later.
  • the diameter of a circle P having a radius equal to the distance between the centre of the shaft portion 22 and the outermost edge of the longer helical rib 24 is slightly larger than the inside diameter of the fluid pipe 30.
  • the turbulence iinducing member 20 is easily manufactured" though not illustrated, by rotatably attaching to an extruder a mouthpiece having an outlet of a shape identical with the cross section of the turbulence inducing member, extruding a synthetic resin from the outlet while rotating the mouthpiece, helically twisting the synthetic resin while in a sof tened state between the mouthpiece and a cooling vessel by means of the rotation of the mouthpiece, passing the synthetic resin through water in the cooling vessel, and drawing the synthetic resin from the cooling vessel.
  • the softened synthetic resin may be drawn by rotating the synthetic resin itself with the mouthpiece fixed to the extruder.
  • the curved leading end portion 24a of the helical rib 24 comes into contact with the inner wall of the fluid pipe 30 along its helical pitch.
  • the shaft portion 22 is substantially helically deformed within the fluid pipe 30 as illustrated in Figure 4. Therefore, the deformation of the shaft portion 22 urges the curved leading end portions 24a of the rib 24 to forcibly contact the inner wall of the fluid pipe 30.
  • the turbulence inducing member 20 is thus retained fast wi thin the fluid pipe 30 with the curved leading end portions 24a kept in intimate contact with the inner wall of the fluid pipe 30.
  • the turbulence inducing member 20 is neither vibrated in the direction in which the fluid flows nor rotated about the shaft portion 22.
  • the main part of the fluid within the pipe flows along the radially longer helical rib 24 and the curved surfaces of the curved leading end portions 24a.
  • shorter helical rib 26 and continues to converge upon and diverge from the main fluid flow. Therefore, turbulence is promoted in the fluid.
  • the turbulence inducing member just described has two helical ribs, but the number of ribs is not limited to two.
  • the turbulence inducing member may have three or more helical ribs at least one of which has a radial extent different from that of the remainder.
  • An example of a turbulence inducing member having three helical ribs 24, 26 and 28 is illustrated in Figure 5.
  • a turbulence inducing member according to -the present invention is held fast within the fluid pipe, it is possible to avoid completely either vibration or rotation of the turbulence inducing member within the fluid pipe due to the flow of the fluid and to effectively prevent the generation of noise due to the rattling of the turbulence inducing member against the inner wall of the fluid pipe, with the result that the turbulence efficiency can be kept high. Furthermore, since part of the fluid flow rides over the radially shorter helical rib and continues to converge upon and diverge from the main fluid flow, the turbulence efficiency can be promoted to a major extent. That is to say, the heat exchange efficiency can satisfactorily be enhanced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Fluid Mechanics (AREA)
  • Pipe Accessories (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

A plastics turbulence inducing member 20 comprises a shaft portion 22 and a pair of helical ribs 24, 26 extending radially from the shaft portion. The rib 24 has a greater radial extent than the rib 26 and forms a close fit with a pipe 30 for a fluid in an air conditioning system for example, while the rib 26 stops short of the wall of the pipe. The member 20 is thus held firmly in position and increased turbulence is induced, thereby enhancing the heat exchange efficiency.

Description

  • This invention relates to turbulence inducing members for insertion into a pipe for a fluid such as a refrigerant in various kinds of air conditioning systems for inducing turbulence in the flow of the fluid thereby enhancing the heat exchange efficiency
  • There have been previous proposals for turbulence inducing members, such as those made of metal in the shape of a ribbon or in helical form and those made of a synthetic resin which is light in weight and easy to manufacture. French patent no: 77.30460, for example, discloses a plastics turbulence inducing member which is provided with a pair of equal helical ribs and having its maximum outside diameter slightly smaller than the inside diameter of the pipe into which it is to be inserted. Since such a plastics turbulence inducing member is a loose fit in the fluid pipe, it vibrates within the fluid pipe in the direction of fluid flow and/or is rotated around its axis by the flow of the fluid, which leads to a disadvantageous decrease in efficiency in the production of turbulence. When such a plastics turbulence inducing member is used in an air conditioning system for example, installed within a room, it rattles against the inner wall of the fluid pipe due to the aforementioned vibration and/or rotation, thereby giving rise to noise. Particularly when such an air conditioning system is operated at night, the noise resounds throughout the room and disturbs the occupants.
  • The main object of the present invention. is to provide a plastics turbulence inducing member which is neither vibrated nor rotated within the fluid pipe by the flow of the fluid, thereby preventing the generation of noise and enhancing the turbulence inducing efficiency.
  • According to the present invention a plastics turbulence inducing member having at least two helical ribs is characterised in that one of the ribs has a radial extent different from that of the other rib or ribs.
  • The invention will now be described in more detail, with reference to the accompanying drawings, in which:-
    • Figures 1 (A) and 1(B) are longitudinal and cross sectional views respectively illustrating a conventional plastics turbulence inducing member which has been inserted into a fluid pipe;
    • Figure 2 is a side view illustrating one embodiment of a plastics turbulence inducing member according to the present invention;
    • Figures 3(A) 3(B) and 3(C) are cross sectional views of the turbulence inducing member of Figure 2, taken along lines A - A, B - B and C - C in Figure 2, respectively:
    • Figure 4 is a longitudinal sectional view illustrating the turbulence inducing member of Figure 2 inserted into a pipe; and
    • Figure 5 is a cross sectional view illustrating another embodiment of turbulence inducing member according to the present invention.
  • Figure 1 shows a conventional turbulence inducing member 10 made of a synthetic resin and provided with two helical ribs 12 and 14 which are equal in radial extent. The turbulence inducing member 10 formed by the two ribs 12 and 14 has a maximum diameter which is slightly smaller than the inside diameter of a pipe 16 for fluid so that it may easily be inserted intc the pipe 16. For this reason, the turbulence inducing member 10 is vibrated in the direction in which the fluid flows and/or rotated around its axis by the flow of the fluid, with the result, that the turbulence induced in the fluid is reduced by the amount of the vibrating movement and/or rotating movement and, at the same time, the vibration and/or rotation of the turbulence inducing member 10 allows the member to rattle against the inner wall of the pipe 16 to thereby make noise.
  • The disadvantages suffered by the conventional turbulence inducing member are eliminated by the invention as will now be described with reference to the remaining Figures.
  • The turbulence inducing member 20 shown in Figures 2 and 3 comprises a shaft portion 22 and two helical ribs 24 and 26 of different radial extents which have curved leading end portions 24a and 26a, with pointed leading edges. The maximum width L of the turbulence inducing member 20 at any point is smaller than the inside diameter of a fluid pipe 30 to be described later. However, the diameter of a circle P having a radius equal to the distance between the centre of the shaft portion 22 and the outermost edge of the longer helical rib 24 is slightly larger than the inside diameter of the fluid pipe 30.
  • To show the shape of the turbulence inducing member 20 more, cross sectional views of three portions of the turbulence inducing member taken at a given pitch are illustrated in Figures 3(A), 3(B) and 3(C).
  • The turbulence iinducing member 20 is easily manufactured" though not illustrated, by rotatably attaching to an extruder a mouthpiece having an outlet of a shape identical with the cross section of the turbulence inducing member, extruding a synthetic resin from the outlet while rotating the mouthpiece, helically twisting the synthetic resin while in a sof tened state between the mouthpiece and a cooling vessel by means of the rotation of the mouthpiece, passing the synthetic resin through water in the cooling vessel,
    Figure imgb0001
    and drawing the synthetic resin from the cooling vessel. Optionally, the softened synthetic resin may be drawn by rotating the synthetic resin itself with the mouthpiece fixed to the extruder.
  • When the turbulence inducing member 20 is inserted into the fluid pipe 30, the curved leading end portion 24a of the helical rib 24 comes into contact with the inner wall of the fluid pipe 30 along its helical pitch. As the insertion proceeds, the shaft portion 22 is substantially helically deformed within the fluid pipe 30 as illustrated in Figure 4. Therefore, the deformation of the shaft portion 22 urges the curved leading end portions 24a of the rib 24 to forcibly contact the inner wall of the fluid pipe 30. The turbulence inducing member 20 is thus retained fast wi thin the fluid pipe 30 with the curved leading end portions 24a kept in intimate contact with the inner wall of the fluid pipe 30. Therefore, the turbulence inducing member 20 is neither vibrated in the direction in which the fluid flows nor rotated about the shaft portion 22. When the turbulence inducing member 20 has been inserted into the fluid pipe 30, the main part of the fluid within the pipe flows along the radially longer helical rib 24 and the curved surfaces of the curved leading end portions 24a. On the other hand,
    Figure imgb0002
    shorter helical rib 26 and continues to converge upon and diverge from the main fluid flow. Therefore, turbulence is promoted in the fluid.
  • The turbulence inducing member just described has two helical ribs, but the number of ribs is not limited to two. The turbulence inducing member may have three or more helical ribs at least one of which has a radial extent different from that of the remainder. An example of a turbulence inducing member having three helical ribs 24, 26 and 28 is illustrated in Figure 5.
  • Since a turbulence inducing member according to -the present invention is held fast within the fluid pipe, it is possible to avoid completely either vibration or rotation of the turbulence inducing member within the fluid pipe due to the flow of the fluid and to effectively prevent the generation of noise due to the rattling of the turbulence inducing member against the inner wall of the fluid pipe, with the result that the turbulence efficiency can be kept high. Furthermore, since part of the fluid flow rides over the radially shorter helical rib and continues to converge upon and diverge from the main fluid flow, the turbulence efficiency can be promoted to a major extent. That is to say, the heat exchange efficiency can satisfactorily be enhanced.

Claims (2)

1.
Figure imgb0003
Figure imgb0004
2. The combination of a plastics turbulence inducing member according to claim 1 and a pipe of which the diameter is slightly less than that of a circle P having a radius equal to the distance between the centre of the shaft portion and the outermost edge of the helical rib having the greatest radial extent.
EP82304794A 1981-10-13 1982-09-10 Turbulence inducing members Withdrawn EP0077130A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1981151934U JPS5923985Y2 (en) 1981-10-13 1981-10-13 Synthetic resin turbulator
JP151934/81U 1981-10-13

Publications (1)

Publication Number Publication Date
EP0077130A1 true EP0077130A1 (en) 1983-04-20

Family

ID=15529389

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82304794A Withdrawn EP0077130A1 (en) 1981-10-13 1982-09-10 Turbulence inducing members

Country Status (2)

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EP (1) EP0077130A1 (en)
JP (1) JPS5923985Y2 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0257220A1 (en) * 1986-07-31 1988-03-02 Perfils Tecnics, S.A. "Pertecsa" Turbulence device for heat exchanger tubes
WO2003045280A1 (en) * 2001-11-21 2003-06-05 Tayside Flow Technologies Limited Helical insert for a conduit
DE10206250A1 (en) * 2002-02-15 2003-09-04 Ming-Yu Lai Connector for reservoir of drinking water dispenser, has guiding member, mounted in passage of body, with post and spiral leaves extending outward from outer periphery of post to cause vortex flow as fluid passes through spiral leaves
EP1589274A1 (en) * 2004-04-24 2005-10-26 GM Global Technology Operations, Inc. Flow-acoustic optimized flexible pipe
EP1589273A1 (en) * 2004-04-24 2005-10-26 GM Global Technology Operations, Inc. Flow-acousticly optimized flexible pipe
CN102670337A (en) * 2012-05-29 2012-09-19 朱晓义 Siphunculus of human body and channel of human body
CN103203193A (en) * 2012-01-11 2013-07-17 常州市姚氏铸造材料有限公司 Mesh tube type convection contact apparatus and convection contactor thereof
EP2114828A4 (en) * 2006-11-07 2014-01-08 Erik Munkholt Soerensen Aps Device and method for treatment of water and other liquid materials
US20140191057A1 (en) * 2013-01-07 2014-07-10 1,4 Group, Inc. Thermal fogger for creating stable aerosols
CN107024129A (en) * 2015-11-17 2017-08-08 川崎重工业株式会社 Cool down the fixed structure of rectification apparatus in manufacture method, the interior rectification apparatus of pipe, cooling tube and the pipe of pipe unit
CN107676301A (en) * 2017-10-18 2018-02-09 朱晓义 A kind of bladeless fan
US20180099444A1 (en) * 2016-10-06 2018-04-12 Injection Mold Consulting, LLC Injection mold insert
CN111589279A (en) * 2020-06-08 2020-08-28 福建伊普思实业有限公司 Heat exchanger of refrigeration dryer

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102628466B (en) * 2012-04-19 2013-12-18 朱晓义 Pipeline
JP2019086180A (en) * 2017-11-02 2019-06-06 カルソニックカンセイ株式会社 Double pipe and manufacturing method thereof
KR102134252B1 (en) * 2018-09-28 2020-07-15 전학송 Countercurrent recovering device for tenter machine recovering waste heat of high temperature gas with swirl flow and removing oil mist

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1425901A (en) * 1964-03-04 1966-01-24 Brown Finture Company Heat exchange tube with internal turbulence increase device
GB1027933A (en) * 1962-05-02 1966-04-27 English Electric Co Ltd Improvements in and relating to heat exchanger tubes
DE2104219A1 (en) * 1971-01-29 1972-08-10 Zimmer Ag Planung U Bau Von In Pot life sprectrum enhancement - for viscous melts using special stirrers esp for extruded fibre prodn
FR2404511A1 (en) * 1977-09-29 1979-04-27 Sogex Non-rotating twisted profiles prodn. using a rotating extrusion die - used to mfr. regular helical tape profiles e.g. polypropylene turbulence inducers for automobile radiator tubes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1027933A (en) * 1962-05-02 1966-04-27 English Electric Co Ltd Improvements in and relating to heat exchanger tubes
FR1425901A (en) * 1964-03-04 1966-01-24 Brown Finture Company Heat exchange tube with internal turbulence increase device
DE2104219A1 (en) * 1971-01-29 1972-08-10 Zimmer Ag Planung U Bau Von In Pot life sprectrum enhancement - for viscous melts using special stirrers esp for extruded fibre prodn
FR2404511A1 (en) * 1977-09-29 1979-04-27 Sogex Non-rotating twisted profiles prodn. using a rotating extrusion die - used to mfr. regular helical tape profiles e.g. polypropylene turbulence inducers for automobile radiator tubes

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0257220A1 (en) * 1986-07-31 1988-03-02 Perfils Tecnics, S.A. "Pertecsa" Turbulence device for heat exchanger tubes
WO2003045280A1 (en) * 2001-11-21 2003-06-05 Tayside Flow Technologies Limited Helical insert for a conduit
WO2003045279A1 (en) * 2001-11-21 2003-06-05 Tayside Flow Technologies Limited A helical formation for a conduit
EP1314406A3 (en) * 2001-11-21 2004-04-21 Tayside Flow Technologies Limited An insert for a conduit
US7185677B2 (en) 2001-11-21 2007-03-06 Tayside Flow Technologies Limited Helical formation for a conduit
US7331989B2 (en) 2001-11-21 2008-02-19 Tayside Flow Technologies Limited Insert for a conduit
US8021415B2 (en) 2001-11-21 2011-09-20 Tayside Flow Technologies Limited Insert for a conduit
DE10206250A1 (en) * 2002-02-15 2003-09-04 Ming-Yu Lai Connector for reservoir of drinking water dispenser, has guiding member, mounted in passage of body, with post and spiral leaves extending outward from outer periphery of post to cause vortex flow as fluid passes through spiral leaves
DE10206250B4 (en) * 2002-02-15 2004-05-06 Lai, Ming-Yu, Ta-Ya Hsiang Connector for a liquid container
EP1589274A1 (en) * 2004-04-24 2005-10-26 GM Global Technology Operations, Inc. Flow-acoustic optimized flexible pipe
EP1589273A1 (en) * 2004-04-24 2005-10-26 GM Global Technology Operations, Inc. Flow-acousticly optimized flexible pipe
EP2114828A4 (en) * 2006-11-07 2014-01-08 Erik Munkholt Soerensen Aps Device and method for treatment of water and other liquid materials
CN103203193A (en) * 2012-01-11 2013-07-17 常州市姚氏铸造材料有限公司 Mesh tube type convection contact apparatus and convection contactor thereof
CN103203193B (en) * 2012-01-11 2015-09-02 常州市姚氏铸造材料有限公司 Mesh tube type convection contact device and convection contactor thereof
CN102670337A (en) * 2012-05-29 2012-09-19 朱晓义 Siphunculus of human body and channel of human body
CN102670337B (en) * 2012-05-29 2015-03-04 朱晓义 Siphunculus of human body and channel of human body
US20140191057A1 (en) * 2013-01-07 2014-07-10 1,4 Group, Inc. Thermal fogger for creating stable aerosols
US9795976B2 (en) * 2013-01-07 2017-10-24 1,4Group, Inc. Thermal fogger for creating stable aerosols
EP2941319B1 (en) * 2013-01-07 2022-08-17 1,4 Group, Inc. Thermal fogger for creating stable aerosols
CN107024129A (en) * 2015-11-17 2017-08-08 川崎重工业株式会社 Cool down the fixed structure of rectification apparatus in manufacture method, the interior rectification apparatus of pipe, cooling tube and the pipe of pipe unit
CN107024129B (en) * 2015-11-17 2020-04-10 川崎重工业株式会社 Cooling pipe, method for manufacturing cooling pipe unit, in-pipe rectification tool, and fixing structure
US20180099444A1 (en) * 2016-10-06 2018-04-12 Injection Mold Consulting, LLC Injection mold insert
US10688703B2 (en) * 2016-10-06 2020-06-23 Injection Mold Consulting, LLC Injection mold insert
CN107676301A (en) * 2017-10-18 2018-02-09 朱晓义 A kind of bladeless fan
CN111589279A (en) * 2020-06-08 2020-08-28 福建伊普思实业有限公司 Heat exchanger of refrigeration dryer

Also Published As

Publication number Publication date
JPS5923985Y2 (en) 1984-07-16
JPS5858280U (en) 1983-04-20

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Inventor name: HAMA, TAIRA