|
(11) | EP 0 527 841 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
|
|
| (54) |
AIR CONTROL VALVE LUFTREGELUNGSVENTIL SOUPAPE DE REGULATION D'AIR |
|
|
|||||||||||||||||||||||||||||||
| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
[0001] The present invention relates to an air control valve, and in particular to a valve for controlling the velocity of air at an intake hood of a trim handling system serving a high speed winder.
[0003] Typically in such systems air is drawn in through a long entry duct, which may be 6 metres in length, by a fan. In prior art systems, a damper is provided to control the air speed, but this can have the effect of increasing the amount of air which is actually pumped by the fan.
[0004] Many systems require a constant air flow to avoid overloading the apparatus, such as a filter, downstream of the fan.
[0005] The present invention provides a control valve between a fan and an entry duct in a trim handling system, the control valve being located in a passage between the entry duct and the fan and comprising a flap which extends into the passage from a wall thereof to restrict the path from the entry duct to the fan and means for bleeding air into the passage behind the flap.
[0006] Preferably the bleeding means is a bleed aperture and a second flap controls the opening in the bleed aperture.
[0007] It has been found that the valve of the invention can control the air speed whilst at the same time allowing for a more even or substantially constant air flow past the fan.
[0008] Other preferred features and advantages of the invention will be apparent from the following description and the accompanying claims.
[0009] The invention will be further described by way of example with reference to the accompanying drawings, in which:
Figure 1 shows schematically an air handling system incorporating a valve in accordance with the invention; and
Figure 2 is a more detailed side view of the valve of Figure 1.
Figure 1 shows an air handling system 2 particularly designed for handling paper trim, comprising an entry duct 4 which may typically be 6 to 8 metres long and of rectangular cross-section. The duct 4 feeds air to a fan 6 housed in an acoustic box 8 for reducing noise emission. The duct 4 may also act as or incorporate a silencer.
[0010] Positioned just outside of the acoustic box, in series between the entry duct 4 and the fan 6, is an air velocity control valve 10 in accordance with the invention.
[0011] As seen more particularly in Figure 2, the valve 10 comprises a first flap 12 which is motorised and arranged to be pivoted about one end 14 so as to extend into the passage 15 between the duct 4 and fan 6. In its "off" position, the flap 12 lays along the top of the passage 15. The flap 12 extends across the width of the passage 15 which is seen in side view in Figures 1 and 2.
[0012] The positioning of the flap 12 controls the operation of a second flap 16 which pivots freely and controls the opening of a bleed aperture 18. Bleed aperture 18 is connected by a conduit 20 to the acoustic box 8 and an air stream is drawn into the passage 15 by the flow of the main air stream A from the duct 4.
[0013] The movement of the flap 16 is limited by an adjustable stop 22, whilst the motorised flap 12 may be swung further into the passage 15.
[0014] Flap 16 bears on flap 12 by an adjustable stop 24 and so the valve can be tuned to the requirements of the air handling system by adjustment of the stops 22, 24.
1. A control valve between a fan (6) and an entry duct (4) in a trim handling system,
the control valve (10) being located in a passage (15) between the entry duct (4)
and the fan (6) and comprising a flap (12) which extends into the passage (15) from
a wall thereof to restrict the path from the entry duct (4) to the fan (6), and means
(16) for bleeding air into the passage (15) downstream of the flap (12).
2. A valve as claimed in claim 1, characterised in that the position of the flap (12)
is controlled by a motor.
3. A valve as claimed in claim 1 or 2, characterised in that the bleeding means is a
bleed aperture (18) in the passage wall, and a second flap (16) controls the opening
in the bleed aperture (18).
4. A valve as claimed in claim 3, characterised in that the second flap (16) bears on
the first flap (12) to move therewith, movement of the second flap (16) opening and
closing the bleed aperture (18).
5. A valve as claimed in claim 4, characterised in that the second flap (16) bears on
the first flap (12) by means of an adjustable stop (22).
6. A valve as claimed in claim 4 or 5, characterised in that the opening movement of
the second flap (16) is limited by an adjustable stop (22).
7. A trim handling system comprising an entry duct (4) a fan (6) and a control valve
(10) as defined in any one of claims 1 to 6, wherein an acoustic box (8) surrounds
the fan and the means (16) for bleeding air into the passage (15) draws air from the
acoustic box (8).
1. Steuerventil zwischen einem Gebläse (6) und einem Einlaufkanal (4) in einem Beschnitt-Handhabungssystem,
wobei sich das Steuerventil (10) in einem Durchgang (15) zwischen dem Einlaufkanal
(4) und dem Gebläse (6) befindet und eine Klappe (12), die von einer Wand des Durchgangs
(15) in diesen hineinreicht, um die Bahn von dem Einlaufkanal (4) zu dem Gebläse (6)
zu beschränken, und ein Mittel (16) umfaßt, um Entlüftungsluft in den Durchgang (15)
unterhalb der Klappe (12) fließen zu lassen.
2. Ventil nach Anspruch 1, dadurch gekennzeichnet, daß die Position der Klappe (12) durch
einen Motor gesteuert wird.
3. Ventil nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß das Entlüftungs-Mittel
eine Entlüftungs-Öffnung (18) in der Wand des Durchgangs ist und eine zweite Klappe
(16) das Öffnen der Entlüftungs-Öffnung (18) steuert.
4. Ventil nach Anspruch 3, dadurch gekennzeichnet, daß die zweite Klappe (16) auf die
erste Klappe (12) drückt, um sich mit dieser zu bewegen, wobei die Bewegung der zweiten
Klappe (16) die Entlüftungs-Öffnung (18) öffnet und schließt.
5. Ventil nach Anspruch 4, dadurch gekennzeichnet, daß die zweite Klappe (16) durch einen
verstellbaren Anschlag (22) auf die erste Klappe (12) drückt.
6. Ventil nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, daß die Bewegung
des Öffnens der zweiten Klappe (16) durch einen verstellbaren Anschlag (22) begrenzt
wird.
7. Beschnitt-Handhabungssystem, das einen Einlaufkanal (4). ein Gebläse (6) und ein Steuerventil
(10), wie es in einem der Ansprüche 1 bis 6 definiert wurde, umfaßt, bei dem ein Schallkasten
(8) das Gebläse umschließt und das Mittel (16) um Entlüftungsluft in den Durchgang
(15) fließen zu lassen, die Luft aus dem Schallkasten (8) ansaugt.
1. Soupape de régulation entre un ventilateur (6) et un conduit d'entrée (4) dans un
système de traitement de rognures, la soupape de régulation (10) étant agencée dans
un passage (15) entre le conduit d'entrée (4) et le ventilateur (6) et comprenant
un clapet (12) s'étendant dans le passage (15) à partir d'une paroi correspondante
pour limiter la voie menant du conduit d'entrée (4) vers le ventilateur (6) et un
moyen (16) pour purger l'air dans le passage (15) en aval du clapet (12).
2. Soupape selon la revendication 1, caractérisée en ce que la position du clapet (12)
est commandée par un moteur.
3. Soupape selon les revendications 1 ou 2, caractérisée en ce que le moyen de purge
est une ouverture de purge (18) dans la paroi du passage, un deuxième clapet (16)
réglant l'ouverture de l'ouverture de purge (18).
4. Soupape selon la revendication 3, caractérisée en ce que le deuxième clapet (16) s'appuie
sur le premier clapet (12) et se déplace avec celui-ci, le déplacement du deuxième
clapet (16) ouvrant et fermant l'ouverture de purge (18).
5. Soupape selon la revendication 4, caractérisée en ce que le deuxième clapet (16) s'appuie
sur le premier clapet (12) par l'intermédiaire d'un arrêt ajustable (22).
6. Soupape selon les revendications 4 ou 5, caractérisée en ce que le déplacement d'ouverture
du deuxième clapet (16) est limité par un arrêt ajustable (22).
7. Système de traitement de rognures comprenant un conduit d'entrée (4), un ventilateur
(6) et une soupape de régulation (10). comme définie dans l'une quelconque des revendications
1 à 6, dans laquelle un boîtier insonore (8) entoure le ventilateur, le moyen (16)
servant à purger l'air dans le passage (15) aspirant l'air à partir du boîtier insonore
(8).