EP0393603A2 - Dispositif de fermeture - Google Patents

Dispositif de fermeture Download PDF

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Publication number
EP0393603A2
EP0393603A2 EP90107290A EP90107290A EP0393603A2 EP 0393603 A2 EP0393603 A2 EP 0393603A2 EP 90107290 A EP90107290 A EP 90107290A EP 90107290 A EP90107290 A EP 90107290A EP 0393603 A2 EP0393603 A2 EP 0393603A2
Authority
EP
European Patent Office
Prior art keywords
memory wire
closure device
wire
memory
final shape
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Withdrawn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
EP90107290A
Other languages
German (de)
English (en)
Other versions
EP0393603A3 (fr
Inventor
Rolf Zeissig
Richard Vosseler
Hans-Georg Reiss
Thomas Remmen
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.)
Maico Elektroapparate Fabrik GmbH
Original Assignee
Maico Elektroapparate Fabrik GmbH
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 Maico Elektroapparate Fabrik GmbH filed Critical Maico Elektroapparate Fabrik GmbH
Publication of EP0393603A2 publication Critical patent/EP0393603A2/fr
Publication of EP0393603A3 publication Critical patent/EP0393603A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/15—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre with parallel simultaneously tiltable lamellae

Definitions

  • the invention relates to a closure device for a ventilation duct or the like. According to the preamble of claim 1.
  • Closure devices of this type are known (DE-PS 34 00 793; DE-OS 35 00 641).
  • the actuators made of a memory alloy used by them are bent when changing between the cold final shape and the warm final shape. It is known that such actuators made of a memory alloy can tire at higher load cycles; this can lead to the fact that sooner or later the closure device will no longer open or close completely.
  • the memory actuator is a wire that is constantly held so tight by the return spring that it returns to its original length each time it returns from its shorter end shape to the longer end shape, the memory wire is not fatigued tends or the fatigue is significantly postponed. It is also ensured that, due to the constant length of the memory wire in its longer final shape, the at least one closure member is always in the same closed position or open position.
  • the memory wire is preferably designed as a straight wire in its effective section, which wire always remains straight, so that signs of fatigue are eliminated in the event of any bending.
  • the straight effective section of the memory wire can be a section of a longer wire or form the wire as a whole.
  • the position of the at least one closure member caused by the cold final shape of the memory wire can be its closed position, since it is particularly important in such closure devices that their closed position is always the same position.
  • the closure device according to the invention is always structurally simple and inexpensive to implement due to the simple design of the memory wire.
  • the actuating device also works practically completely noiselessly because the memory wire, which is kept constantly tensioned, makes it possible to reliably avoid rattling noises.
  • the memory wire is shorter in its warm final shape than in its cold final shape.
  • the cold final shape of the memory wire is understood to mean the shape that it has in its so-called "low temperature phase", for example at normal room temperatures of, for example, 20 ° C.
  • the warm final shape of the memory wire is the shape that it has assumes in its so-called high-temperature phase, for example> 50 ° C., which is therefore above the structural transformation temperature range of the memory alloy.
  • the restoring force of the restoring spring which it exerts on the memory wire in its longer final shape, is at least 30%, preferably approximately 70 to 95% of the maximum tensile force. which the memory wire is able to perform when it changes from its longer to its shorter shape.
  • the memory wire can be heated in any suitable manner.
  • a heating element is arranged on the memory wire, for example an electrical heating foil, a PTC heating element or the memory wire comprises a heating coil, for example a heating coil, over a larger part of its length or approximately over its length is.
  • a heating device which is arranged laterally next to it.
  • the memory wire itself serves as a heating resistor by flowing current through which it heats, which is possible because memory alloys have relatively large electrical resistances.
  • the closure device 10 shown in detail in FIG. 1 has a housing 17 with an air passage opening 11.
  • This air passage opening 11 can be blocked and opened by means of parallel lamellae (closure lamellae) 13 which are rotatably mounted in an inner frame 12 comprising this air passage opening 11 by means of pins 14.
  • a rod-shaped driver 15, which engages in an opening of a vertical coupling rod 16 is arranged on each closure lamella 13.
  • This coupling rod 16 is used for the synchronous adjustment of all the closure slats 13 to one another, this coupling rod 16 being moved vertically up and down by an electrically feedable adjusting device 21. In the uppermost position of the coupling rod 16 shown, the locking slats are closed and in the dash-dotted lower position of the coupling rod 16, they are fully open.
  • This closure device 10 can be arranged on a fan having a pipe (duct) through which the conveyable air can flow or form part of such a fan, for example a wall ventilator, window ventilator or the like. It can also be located on or in ventilation openings or ducts of walls, ceilings or the like. Or be arranged on or in other ventilation ducts to shut off and open them.
  • the housing 17 has a circumferential inner space 44, which is encompassed on the outer circumferential side by an outer frame 19 and on the inside by the inner frame 12 of the preferably one-piece housing 17 molded from plastic.
  • the front wall of the housing is designated 20. In Fig. 1, its back is visible.
  • the actuating device 21 serves to move the coupling rod 16 up and down for the purpose of opening and closing the slats 13. It has a one-piece support part 22 molded from plastic, which is screwed onto the rear side of the front wall 20 of the housing 17 by means of three screws according to FIG. 1 .
  • This support part 22 has an interior space 24 which is delimited by a raised edge 23 and which is open towards a circuit board 26 of the support part 22 and in which a transformer 25 is fixedly arranged in the vicinity of its left end, with reference to FIG Primary 3 via electrical conductors 28, 28 'at the connection to a conventional AC network serving terminals 46 are connected.
  • the secondary winding of the transformer 25 carries low voltage and is connected via a conductor 18, 18 'and according to FIG. completely or almost over its length for its electrical heating.
  • the portion of the memory wire 33 which is encompassed by the heating coil 32 for heating is the actual effective portion thereof and is preferably designed as a straight rod. Outside the effective range, the memory wire 33 forms e.g. an eyelet 43 is not there, but this has no influence on the function.
  • the thermistor is connected at one end to the memory wire 33 and at the other end to the heating coil 32.
  • the memory wire 33 forms part of the electrical connection of the transformer 25 to the heating coil 32 by the one connected to the transformer 25 Head 18 'to the memory wire 33 near its left end and the thermistor 31 is connected to the memory wire 33 near its right-hand end.
  • the circuit is readily apparent from Fig. 3.
  • a pivoting member 29 is rotatably mounted on the board 26 of the supporting part 22 which projects beyond the raised edge 23 to the right on a cylindrical bearing journal 27 which is fixedly arranged in this board.
  • This pivoting member consists of a block 34 having its bearing bore, in which a hook-shaped holding arm 47 is firmly inserted.
  • the permanently straight memory wire 33 has at its right-hand end the eyelet 43 with which it is hooked into this hook 47.
  • the left end of the memory wire 33 in FIG. 1 is held, for example glued, in an electrically insulating projection of the support part 22 molded from electrically insulating plastic.
  • the heating coil 32 is of course electrically isolated from the memory wire 33 with the exception of the electrical connection via the thermistor 31.
  • the freely tensioned straight section located between the support part 22 and the eyelet 43 and which is enclosed by the heating coil 32 is thus the effective section of the memory wire 33.
  • a rod-shaped driver 40 is also fixedly arranged, which, as shown, engages in an opening of the coupling rod 16 and is connected to it in a movement-locking manner. If there should be undesired play at the connection point between the driver 40 and the coupling rod 16, provision can be made to constantly load the coupling rod 16 in an upward or downward direction by means of a spring, not shown, which engages with it, so that it constantly contacts the carrier 40 attached is pressed and so a play-free connection between these two parts 16 and 40 is brought about.
  • the bearing pin 27 protrudes considerably above the block 34 of the swivel member 29 and a return spring 35 with a helically wound area is pushed onto this projecting area.
  • a return spring 35 with a helically wound area is pushed onto this projecting area.
  • both sides connect in one piece.
  • the arm 38 'of this return spring 35 is anchored in the block 34 by engaging with a bend in a hole in the block 34.
  • the other arm 38 of this return spring 35 is constantly pressed against an abutment 36 as a result of the constantly strong prestressing of the return spring 35, which forms an end section of the raised edge 23 of the supporting part 22.
  • the length of the memory wire 33 is selected so that it is constantly tensioned by the return spring 35 via the pivot member 29, that is to say constant axial tension is exerted on it via the hook 47 and the block 34 by the return spring 35.
  • the actual effective section is thus the area of the memory wire 33 which is held taut by the return spring 36.
  • a stop 37 is also arranged which serves to limit the pivoting movement of the block 34, but the block 34 does not on this stop 37 need to lie on, since it can be held just before the stop 37 by the memory wire 33 when it has assumed its longer and thus the cold final shape.
  • This stop 37 is a projection of the one-piece supporting part 22 and provided in the event that the return spring 35 can stretch the memory wire 33 so much that it comes to rest of the block 34 against the stop 37.
  • An on-off switch 39 for opening and closing the closure device 10 is also interposed in line 28.
  • the function of this locking device with adjusting device is as follows:
  • the slats 13 are normally in their closed position.
  • the switch 39 is open.
  • the memory wire 33 is in its cold final shape and thus has its longer shape in this exemplary embodiment and is kept constantly tensioned by the return spring 35 via the pivot member 29.
  • the switch 39 is closed.
  • electrical current flows through the heating coil 32, which forms a resistance wire, and thus heats the memory wire 33 beyond its conversion temperature, as a result of which it has shortened its length and has now assumed its warm final shape and thus its shorter final shape.
  • the pivot member 29 has then been pivoted into the position indicated by the dot-dash line of the block 34, the driver 40 now being in the position also shown in dot-dash line and also the coupling rod 16 in its dot-dash line position.
  • the slats 13 and thus the closure device are now open to the maximum.
  • the force of the return spring 35 can expediently so large should be provided that the axial pulling force it exerts on the memory wire 33 is at least 30%, preferably approximately 70 to 95% of the maximum pulling force which the memory wire 33 is able to exert.
  • the switch 39 is opened and now the memory wire 33 is no longer heated and consequently cools down. This results in the structural transformation of the memory wire 33, with the result that it again assumes its cold and thus the longer final shape, into which it is forced in any case by the restoring force of the return spring 35, whereby fatigue of the memory alloy is particularly good is counteracted.
  • thermistor 31 is a PTC thermistor and practically controls the temperature of the memory wire 33, as long as it is heated by the heating coil 32, since it is arranged on the memory wire 33 so that it Temperature feels.
  • the resistance of the thermistor 31 also increases, thereby reducing the heating of the memory wire 33, and if its temperature drops while the heating is still switched on, the resistance of the thermistor 31 also decreases, with the result that the thickness the heating of the memory wire 33 rises again. This corresponds to a regulation of its temperature.
  • the memory alloy of the memory wire can be of any known type and therefore requires no further explanation.
  • the alloy groups NiTi, NiTiCu, Gu-Zn-Al and Cu-Al-Ni may be mentioned as examples of suitable alloys.
  • the return spring 38 and the arm 40 are separate parts. Since these parts 38, 40 are both arranged on the block 34, it can also be provided for structural simplification to design the rod-shaped driver 40 as an arm of the return spring 35 and to hold it firmly on the block 34, for example, to insert it positively into a groove in the block 34 . The driver or arm 40 is then in one piece with the return spring 38.
  • a block 51 made of electrically insulating casting resin or the like which is indicated by dash-dotted lines in FIG. 1. So to cast with the casting resin or the like. Appropriately together with its connection to a conventional electrical network of, for example, 220 V alternation current-serving primary-side connections 50 and its secondary-side, low-voltage connections 49, so that the connecting wires 18, 18 ', 28 and 28' then protrude from this block 51.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Flow Control Members (AREA)
  • Resistance Heating (AREA)
EP19900107290 1989-04-21 1990-04-18 Dispositif de fermeture Withdrawn EP0393603A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3913150 1989-04-21
DE19893913150 DE3913150A1 (de) 1989-04-21 1989-04-21 Verschlusseinrichtung

Publications (2)

Publication Number Publication Date
EP0393603A2 true EP0393603A2 (fr) 1990-10-24
EP0393603A3 EP0393603A3 (fr) 1991-03-27

Family

ID=6379157

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900107290 Withdrawn EP0393603A3 (fr) 1989-04-21 1990-04-18 Dispositif de fermeture

Country Status (3)

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EP (1) EP0393603A3 (fr)
DD (1) DD298026A5 (fr)
DE (1) DE3913150A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3664582A (en) * 1969-10-29 1972-05-23 Robertshaw Controls Co Non-linear temperature responsive valve assemblies
DE3100231A1 (de) * 1981-01-07 1982-08-05 Helios-Apparatebau KG, Müller & Co, 7730 Villingen-Schwenningen "vorrichtung zum betaetigen von verschlusseinrichtungen lueftungstechnischer anlagen"
DE3500641A1 (de) * 1984-01-12 1986-07-10 Maico Elektroapparate-Fabrik GmbH, 7730 Villingen-Schwenningen Verschlusseinrichtung fuer lueftungskanaele o.dgl.
DE8703153U1 (de) * 1987-03-02 1988-06-30 Maico Elektroapparate-Fabrik GmbH, 7730 Villingen-Schwenningen Verschlußeinrichtung für Lüftungskanäle o.dgl.
JPH06146839A (ja) * 1992-11-04 1994-05-27 Suzuki Motor Corp エンジンの潤滑装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7900875U1 (de) * 1981-10-22 BBC AG Brown, Boveri & Cie., 5401 Baden, Aargau Thermoschalter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3664582A (en) * 1969-10-29 1972-05-23 Robertshaw Controls Co Non-linear temperature responsive valve assemblies
DE3100231A1 (de) * 1981-01-07 1982-08-05 Helios-Apparatebau KG, Müller & Co, 7730 Villingen-Schwenningen "vorrichtung zum betaetigen von verschlusseinrichtungen lueftungstechnischer anlagen"
DE3500641A1 (de) * 1984-01-12 1986-07-10 Maico Elektroapparate-Fabrik GmbH, 7730 Villingen-Schwenningen Verschlusseinrichtung fuer lueftungskanaele o.dgl.
DE8703153U1 (de) * 1987-03-02 1988-06-30 Maico Elektroapparate-Fabrik GmbH, 7730 Villingen-Schwenningen Verschlußeinrichtung für Lüftungskanäle o.dgl.
JPH06146839A (ja) * 1992-11-04 1994-05-27 Suzuki Motor Corp エンジンの潤滑装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN Band 10, Nr. 207 (M-500)(2263), 19 Juli 1986; & JP - A - 6146839 (MATSUSHITA ELECTRIC IND CO LTD) 07.03.1986 *

Also Published As

Publication number Publication date
DE3913150A1 (de) 1990-10-25
EP0393603A3 (fr) 1991-03-27
DD298026A5 (de) 1992-01-30

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