EP1803508B1 - Device for generating a reduced pressure in an enclosed space of a tabletting press and/or an isolator - Google Patents

Device for generating a reduced pressure in an enclosed space of a tabletting press and/or an isolator Download PDF

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Publication number
EP1803508B1
EP1803508B1 EP06025286A EP06025286A EP1803508B1 EP 1803508 B1 EP1803508 B1 EP 1803508B1 EP 06025286 A EP06025286 A EP 06025286A EP 06025286 A EP06025286 A EP 06025286A EP 1803508 B1 EP1803508 B1 EP 1803508B1
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EP
European Patent Office
Prior art keywords
valve
negative pressure
ejector
control unit
duct
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EP06025286A
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German (de)
French (fr)
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EP1803508A2 (en
EP1803508A3 (en
Inventor
Holger Behns
Enrico Gand
Linda Heck
Ralf Zingler
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Fette GmbH
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Fette GmbH
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Publication of EP1803508A3 publication Critical patent/EP1803508A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/02—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0082—Dust eliminating means; Mould or press ram cleaning means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/0001—Control or safety arrangements for ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/0001—Control or safety arrangements for ventilation
    • F24F2011/0002—Control or safety arrangements for ventilation for admittance of outside air
    • F24F2011/0005—Control or safety arrangements for ventilation for admittance of outside air to create underpressure in a room, keeping contamination inside
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/40—Pressure, e.g. wind pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/10—Pressure

Definitions

  • the invention relates to a device for generating a negative pressure in the sealed space of a tablet press and / or an insulator according to claim 1.
  • a tablet press Under a tablet press is usually understood a rotary press, with the help of which not only pharmaceutical tablets, but Pulverpreßlinge can be prepared for a variety of purposes.
  • the press unit is normally located in a housing which is intended to prevent unavoidable dust from penetrating into the surrounding space during the pressing process. This is especially important for a powder material that is toxic in the broadest sense. It is therefore out DE 102 18 220 C2 known to seal the press room sufficiently that powder material does not escape to the outside. In order to improve the sealing effect, it is also known to connect a vacuum source, such as a blower, to the press room. At the same time an opening in the press room is provided, which allows the influx of outside air.
  • a vacuum source such as a blower
  • a negative pressure in the press chamber is constantly generated, on the other hand sucked dust.
  • a sensor is arranged in the press room, whose output signal is applied to a regulator for the vacuum source, such as the fan or dampers in the air flow.
  • insulator For toxic products is known to promote these closed from a tablet press out in a so-called insulator. In the insulator z. As a dedusting, checking the tablets for drug content, hardness and other properties before the tablets are finally fed to a packaging container. It is also known for insulators to generate a negative pressure in the insulator space, in order to prevent the escape of dust into the surrounding space.
  • WO 2005/113169 A is the supply and exhaust air control to an insulator known.
  • the supply and exhaust air is generated by a fan.
  • a pressure sensor With the help of a pressure sensor, it is possible to set the respectively desired pressure in the isolator.
  • the invention has for its object to provide a device for generating a negative pressure in a sealed space of a tablet press or an insulator, with which a negative pressure can be ensured if the vacuum source fails, without a leak-free or -arme To provide sealing in order to maintain the negative pressure for a long time.
  • an ejector is another term for a jet pump.
  • a pumping effect is known to be effected by means of a Venturi nozzle, in which a fluid is supplied to the side of the Venturi nozzle, which generates a propulsion jet.
  • the propulsion jet creates a negative pressure at the beginning of the venturi, which can be used for pumping purposes. Therefore, when an ejector driven by compressed air is connected to the sealed space, a negative pressure can be maintained with it.
  • a vacuum control unit is connected to the sensor in the sealed space and controls a valve disposed between the vacuum source and the drive fluid port of the ejector.
  • This valve is normally closed so that the ejector is not operating. If, on the other hand, it is opened, the ejector generates a negative pressure and at least partially compensates for the failure of the blower or the controller for the blower.
  • this valve is designed so that it is open in the non-activated state, so that the ejector is activated even in case of failure of the vacuum control unit.
  • Another valve is associated with the opening to the sealed space, which is normally open when the fan is functioning properly.
  • this valve is closed in case of failure of the blower or the blower control to produce the required negative pressure with the ejector with a relatively low compressed air consumption.
  • the ejector is typically operated with compressed air, but also the use of a liquid would be generally conceivable.
  • the suction side of the ejector is connected to the suction line of the blower, wherein a third valve between the connection point and the blower is arranged and a fourth valve is arranged in the suction line of the ejector.
  • the third valve ensures that in case of failure of the fan and switching on the ejector on the fan is not sucked counter air.
  • the fourth valve is required to shut off the line to the ejector when the blower is in operation.
  • the third and fourth valves are fluid-actuated.
  • the actuations of the third and fourth valves are connected directly to the compressed air line of the ejector. In this way, these valves are automatically actuated at the moment in which the ejector is operated.
  • the sole figure shows a circuit diagram of a device according to the invention.
  • 10 z As a rotary tablet press or a so-called insulator, which is associated with a tablet press. The insulator receives the tablets produced by the tablet press via a shielded conveying path. In the insulator z. As a dedusting of the tablets, testing the tablets for a number of parameters and the like.
  • a press room 12 In the tablet press 10 is a press room 12, which is largely sealed by the housing of the tablet press.
  • the press room is connected to a line 14 which leads to a blower 16.
  • the motor-driven blower sucks air from the sealed space 12 and thereby puts it under negative pressure. This prevents dust from entering the environment when pressing the tablets. This is important in the compressing material with toxic properties. So that dust is sucked out of the sealed space 12, this has an opening 18 which is connected via a valve 20 with atmosphere.
  • the valve 20 has an electrical actuator 22.
  • a branch line 24 which leads to the suction end of an ejector 26.
  • a valve 28 is disposed in the conduit 24, which is actuated by a pneumatic actuator 30.
  • a valve 32 which is actuated by a pneumatic actuator 34.
  • a pressure line 36 is connected to a pressure source, not shown. This can be z. B. be a compressed air network in production. Alternatively or additionally, a pressure accumulator may be connected to the line 36.
  • a valve 38 a In line 36 is a valve 38 a, which is actuated by an electrical actuator 40.
  • a pressure sensor 42 is arranged, which is connected to a vacuum control unit 44.
  • valves 38a and 28 are closed and valves 32 and 20 are opened.
  • the control device shown maintains a certain negative pressure in the sealed space 12 by means of the sensor 42 upright. This controls the fan 16 and the drive motor for so that a predetermined negative pressure is maintained, being introduced via the opening 18 air from the environment in the sealed space 12. If for certain reasons the drive motor for the blower 16 fails or if the control of the drive motor suffers a defect, this is detected by the sensor 42 and reported to the vacuum control unit. This actuates thereon the valves 38a and 20 via the associated electrical actuations 40 and 22, so that the valve 20 closes and the valve 38a is opened. This creates a pressure on the actuator 30 of the valve 38 and the actuator 34 of the valve 32.
  • the first valve is opened and the second closed.
  • the pressure line 36 is also located at the drive input of the ejector 26, whereby in the ejector 26, which is constructed in the manner of a venturi, a driving jet is generated, which generates a negative pressure at the suction inlet. This negative pressure is communicated to the sealed space 12. With the help of the ejector 26 can therefore be maintained in the sealed space 12, a certain negative pressure. The time in which a negative pressure can be maintained, even if the ejector 26 is supplied only by a limited pressure accumulator, is usually sufficient so that the staff in the production room can leave this, so as not to be exposed to the toxic substances.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur Erzeugung eines Unterdrucks im abgedichteten Raum einer Tablettenpresse und/oder eines Isolators nach dem Patentanspruch 1.The invention relates to a device for generating a negative pressure in the sealed space of a tablet press and / or an insulator according to claim 1.

Unter einer Tablettenpresse wird üblicherweise eine Rundläuferpresse verstanden, mit deren Hilfe nicht nur pharmazeutische Tabletten, sondern Pulverpreßlinge für die verschiedensten Zwecke hergestellt werden können. Die Presseneinheit befindet sich normalerweise in einem Gehäuse, das verhindern soll, daß nicht zu vermeidende Staubentwicklung während des Preßvorgangs in den umgebenden Raum dringt. Besonders wichtig ist dies bei einem Pulvermaterial, das im weitesten Sinne toxisch wirkt. Es ist daher aus DE 102 18 220 C2 bekannt, den Pressenraum ausreichend abzudichten, daß Pulvermaterial nicht nach außen gelangt. Um die Abdichtwirkung zu verbessern, ist ferner bekannt, eine Unterdruckquelle, etwa ein Gebläse, an den Pressenraum anzuschließen. Gleichzeitig ist eine Öffnung im Pressenraum vorgesehen, welche den Zustrom von Außenluft erlaubt. Dadurch wird ständig ein Unterdruck in der Pressenkammer erzeugt, andererseits auch Staub abgesaugt. Zur Aufrechterhaltung eines Mindest- Unterdrucks ist ein Sensor im Pressenraum angeordnet, dessen Ausgangssignal auf eine Regelvorrichtung für die Unterdruckquelle, etwa das Gebläse oder Stellklappen im Luftstrom, gegeben wird.Under a tablet press is usually understood a rotary press, with the help of which not only pharmaceutical tablets, but Pulverpreßlinge can be prepared for a variety of purposes. The press unit is normally located in a housing which is intended to prevent unavoidable dust from penetrating into the surrounding space during the pressing process. This is especially important for a powder material that is toxic in the broadest sense. It is therefore out DE 102 18 220 C2 known to seal the press room sufficiently that powder material does not escape to the outside. In order to improve the sealing effect, it is also known to connect a vacuum source, such as a blower, to the press room. At the same time an opening in the press room is provided, which allows the influx of outside air. As a result, a negative pressure in the press chamber is constantly generated, on the other hand sucked dust. To maintain a minimum negative pressure, a sensor is arranged in the press room, whose output signal is applied to a regulator for the vacuum source, such as the fan or dampers in the air flow.

Bei toxischen Produkten ist bekannt, diese geschlossen aus einer Tablettenpresse heraus in einen sogenannten Isolator zu fördern. Im Isolator erfolgt z. B. eine Entstaubung, eine Überprüfung der Tabletten auf Wirkstoffgehalt, Härte und sonstige Eigenschaften, bevor die Tabletten endgültig einem Verpackungsbehälter zugeführt werden. Auch für Isolatoren ist bekannt, einen Unterdruck im Isolatorraum zu erzeugen, um ein Entweichen von Staub in den Umgebungsraum zu vermeiden.For toxic products is known to promote these closed from a tablet press out in a so-called insulator. In the insulator z. As a dedusting, checking the tablets for drug content, hardness and other properties before the tablets are finally fed to a packaging container. It is also known for insulators to generate a negative pressure in the insulator space, in order to prevent the escape of dust into the surrounding space.

Es ist auch bekannt, einen Pressenraum einer Tablettiermaschine unter Überdruck zu setzen, beispielsweise mit einem Schutzgas, um das Eindringen von Verunreinigungen in den Pressenraum zu vermeiden.It is also known to pressurize a press room of a tableting machine, for example with a protective gas, in order to prevent the ingress of contaminants into the press room.

Naturgemäß läßt sich ein Ausfall der Steuerung für ein Gebläse oder auch des Gebläses selbst nicht mit Sicherheit verhindern. Es ist bekannt, den abgedichteten Raum in einem solchen Fall automatisch zu verschließen und damit den Unterdruck "einzuschließen". Ist der abgedichtete Raum so wirksam abgedichtet, daß sich der Unterdruck nur langsam abbaut, haben im Produktionsraum anwesende Personen die Möglichkeit, diesen rechtzeitig zu verlassen. Bei Maschinen mit rotierenden Wellen tritt jedoch typischerweise eine Leckage an den Wellendichtungen auf, die ebenso wie Schädigungen an den Dichtelementen die Zeit des Unterdruckabbaus auf ein unzulässiges Maß verkürzen.Naturally, a failure of the controller for a fan or the blower itself can not be prevented with certainty. It is known to automatically close the sealed space in such a case and thus "trap" the vacuum. If the sealed room is so effectively sealed that the vacuum dissipates only slowly, persons present in the production room have the opportunity to leave it in good time. In the case of machines with rotating shafts, however, leakage to the shaft seals typically occurs, which, like damage to the sealing elements, reduces the time of the reduced pressure to an impermissible extent.

Aus WO 2005/113169 A ist die Zu-und Abluftregelung zu einem Isolator bekannt. Dabei wird die Zu-und Abluft jeweils von einem Gebläse erzeugt. Mit Hilfe eines Drucksensors ist es möglich, den jeweils gewünschten Druck im Isolator einzustellen.Out WO 2005/113169 A is the supply and exhaust air control to an insulator known. The supply and exhaust air is generated by a fan. With the help of a pressure sensor, it is possible to set the respectively desired pressure in the isolator.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zur Erzeugung eines Unterdrucks in einem abgedichteten Raum einer Tablettenpresse oder eines Isolators zu schaffen, mit der ein Unterdruck sichergestellt werden kann, wenn die Unterdruckquelle ausfällt, ohne eine leckagefreie oder -arme Abdichtung vorsehen zu müssen, um den Unterdruck für längere Zeit aufrecht zu halten.The invention has for its object to provide a device for generating a negative pressure in a sealed space of a tablet press or an insulator, with which a negative pressure can be ensured if the vacuum source fails, without a leak-free or -arme To provide sealing in order to maintain the negative pressure for a long time.

Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is solved by the features of patent claim 1.

Bei der erfindungsgemäßen Vorrichtung ist mit dem abgedichteten Raum die Ansaugseite eines Ejektors verbunden. Ein Ejektor ist ein anderer Begriff für eine Strahlpumpe. Bei dieser wird bekanntlich mit Hilfe einer Venturidüse ein Pumpeffekt bewirkt, in dem ein Fluid seitlich der Venturidüse zugeführt wird, die einen Treibstrahl erzeugt. Der Treibstrahl erzeugt am Beginn der Venturidüse ein Unterdruck, der zu Pumpzwecken verwendet werden kann. Wird daher ein mit Druckluft betriebener Ejektor an den abgedichteten Raum angeschlossen, kann mit ihm ein Unterdruck aufrecht erhalten werden. Eine Unterdruckregeleinheit ist mit dem Sensor im abgedichteten Raum verbunden und steuert ein Ventil an, das zwischen der Unterdruckquelle und dem Treibfluidanschluß des Ejektors angeordnet ist. Dieses Ventil ist normalerweise geschlossen, so daß der Ejektor nicht in Betrieb ist. Wird es hingegen geöffnet, erzeugt der Ejektor einen Unterdruck und kompensiert zumindest teilweise den Ausfall des Gebläses bzw. der Steuerung für das Gebläse. Vorzugsweise ist dieses Ventil so ausgeführt, dass es im nicht angesteuerten Zustand geöffnet ist, damit der Ejektor auch bei Ausfall der Unterdruckregeleinheit aktiviert wird.In the device according to the invention, the suction side of an ejector is connected to the sealed space. An ejector is another term for a jet pump. In this, a pumping effect is known to be effected by means of a Venturi nozzle, in which a fluid is supplied to the side of the Venturi nozzle, which generates a propulsion jet. The propulsion jet creates a negative pressure at the beginning of the venturi, which can be used for pumping purposes. Therefore, when an ejector driven by compressed air is connected to the sealed space, a negative pressure can be maintained with it. A vacuum control unit is connected to the sensor in the sealed space and controls a valve disposed between the vacuum source and the drive fluid port of the ejector. This valve is normally closed so that the ejector is not operating. If, on the other hand, it is opened, the ejector generates a negative pressure and at least partially compensates for the failure of the blower or the controller for the blower. Preferably, this valve is designed so that it is open in the non-activated state, so that the ejector is activated even in case of failure of the vacuum control unit.

Ein weiteres Ventil ist der Öffnung zum abgedichteten Raum zugeordnet, das normalerweise geöffnet ist, wenn das Gebläse bestimmungsgemäß funktioniert.Another valve is associated with the opening to the sealed space, which is normally open when the fan is functioning properly.

Gemäß der Erfindung wird dieses Ventil bei Ausfall des Gebläses oder der Gebläsesteuerung geschlossen, um mit einem relativ geringen Druckluftverbrauch den benötigten Unterdruck mit dem Ejektor zu erzeugen. Es ist aber auch denkbar, den Ejektor mit größerem Druckluftverbrauch bei geöffnetem Ventil zu betreiben, um weiterhin das Absaugen von Luft und Staub zu gewährleisten.According to the invention, this valve is closed in case of failure of the blower or the blower control to produce the required negative pressure with the ejector with a relatively low compressed air consumption. However, it is also conceivable to operate the ejector with greater compressed air consumption with the valve open in order to continue to ensure the suction of air and dust.

Der Ejektor wird typischerweise mit Druckluft betrieben, wobei jedoch auch der Einsatz einer Flüssigkeit generell denkbar wäre.The ejector is typically operated with compressed air, but also the use of a liquid would be generally conceivable.

Es ist denkbar, für den Ejektor einen separaten Anschluß am abgedichteten Raum vorzusehen. Gemäß der Erfindung ist hingegen vorgesehen, daß die Ansaugseite des Ejektors an die Ansaugleitung des Gebläses angeschlossen ist, wobei ein drittes Ventil zwischen dem Anschlußpunkt und dem Gebläse angeordnet ist und ein viertes Ventil in der Ansaugleitung des Ejektors angeordnet ist. Das dritte Ventil sorgt dafür, daß bei Ausfall des Gebläses und dem Einschalten des Ejektors über das Gebläse nicht Gegenluft angesaugt wird. Das vierte Ventil ist erforderlich, um die Leitung zum Ejektor zu sperren, wenn das Gebläse in Betrieb ist.It is conceivable to provide a separate connection to the sealed space for the ejector. According to the invention, however, it is provided that the suction side of the ejector is connected to the suction line of the blower, wherein a third valve between the connection point and the blower is arranged and a fourth valve is arranged in the suction line of the ejector. The third valve ensures that in case of failure of the fan and switching on the ejector on the fan is not sucked counter air. The fourth valve is required to shut off the line to the ejector when the blower is in operation.

Erfindungsgemäß sind das dritte und vierte Ventil fluidbetätigt. Nach der Erfindung sind die Betätigungen des dritten und vierten Ventils unmittelbar an die Druckluftleitung des Ejektors angeschlossen. Auf diese Weise werden diese Ventile automatisch in dem Augenblick betätigt, in dem auch der Ejektor betrieben wird.According to the invention, the third and fourth valves are fluid-actuated. According to the invention, the actuations of the third and fourth valves are connected directly to the compressed air line of the ejector. In this way, these valves are automatically actuated at the moment in which the ejector is operated.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand eines in einer Zeichnung dargestellten Ausführungsbeispiels näher erläutert.An embodiment of the invention will be explained in more detail with reference to an embodiment shown in a drawing.

Die einzige Figur zeigt ein Schaltbild einer Vorrichtung nach der Erfindung.The sole figure shows a circuit diagram of a device according to the invention.

In der Figur bezeichnet 10 z. B. eine Rundläufertablettenpresse oder auch einen sogenannten Isolator, der einer Tablettenpresse zugeordnet ist. Der Isolator erhält die von der Tablettenpresse produzierten Tabletten über einen abgeschirmten Förderweg. Im Isolator erfolgt z. B. eine Entstaubung der Tabletten, eine Prüfung der Tabletten auf etliche Parameter und dergleichen. In der Tablettenpresse 10 befindet sich ein Pressenraum 12, der durch das Gehäuse der Tablettenpresse weitgehend abgedichtet ist. Der Pressenraum ist mit einer Leitung 14 verbunden, die zu einem Gebläse 16 führt. Das motorbetriebene Gebläse saugt Luft aus dem abgedichteten Raum 12 und setzt diesen dadurch unter Unterdruck. Dadurch wird verhindert, daß Staub beim Pressen der Tabletten in die Umgebung gelangt. Dies ist wichtig bei dem verpressenden Material mit toxischen Eigenschaften. Damit auch Staub aus dem abgedichteten Raum 12 abgesaugt wird, weist dieser eine Öffnung 18 auf, die über ein Ventil 20 mit Atmosphäre verbunden ist. Das Ventil 20 weist eine elektrische Betätigung 22 auf.In the figure, 10 z. As a rotary tablet press or a so-called insulator, which is associated with a tablet press. The insulator receives the tablets produced by the tablet press via a shielded conveying path. In the insulator z. As a dedusting of the tablets, testing the tablets for a number of parameters and the like. In the tablet press 10 is a press room 12, which is largely sealed by the housing of the tablet press. The press room is connected to a line 14 which leads to a blower 16. The motor-driven blower sucks air from the sealed space 12 and thereby puts it under negative pressure. This prevents dust from entering the environment when pressing the tablets. This is important in the compressing material with toxic properties. So that dust is sucked out of the sealed space 12, this has an opening 18 which is connected via a valve 20 with atmosphere. The valve 20 has an electrical actuator 22.

Von der Leitung 14 geht eine Abzweigleitung 24 ab, die zu dem Ansaugende eines Ejektors 26 führt. Ansaugseitig vom Ejektor 26 ist ein Ventil 28 in der Leitung 24 angeordnet, das von einer pneumatischen Betätigung 30 betätigt wird. Zwischen dem Anschluß der Abzweigleitung 24 und dem Gebläse 16 ist ein Ventil 32 angeordnet, das von einer pneumatischen Betätigung 34 betätigt wird.From the line 14 is a branch line 24, which leads to the suction end of an ejector 26. Intake side of the ejector 26, a valve 28 is disposed in the conduit 24, which is actuated by a pneumatic actuator 30. Between the junction of the branch line 24 and the blower 16 is arranged a valve 32 which is actuated by a pneumatic actuator 34.

Eine Druckleitung 36 ist an eine nicht gezeigte Druckquelle angeschlossen. Dies kann z. B. ein Druckluftnetz im Produktionsbetrieb sein. Alternativ oder zusätzlich kann auch ein Druckspeicher mit der Leitung 36 verbunden sein. In der Leitung 36 befindet sich ein Ventil 38a, das von einer elektrischen Betätigung 40 betätigt wird.A pressure line 36 is connected to a pressure source, not shown. This can be z. B. be a compressed air network in production. Alternatively or additionally, a pressure accumulator may be connected to the line 36. In line 36 is a valve 38 a, which is actuated by an electrical actuator 40.

Im abgedichteten Raum 12 ist ein Drucksensor 42 angeordnet, der mit einer Unterdruckregeleinheit 44 verbunden ist.In the sealed space 12, a pressure sensor 42 is arranged, which is connected to a vacuum control unit 44.

Während des normalen Produktionsbetriebs sind die Ventile 38a und 28 geschlossen und die Ventile 32 und 20 geöffnet. Die gezeigte Regelvorrichtung hält einen bestimmten Unterdruck im abgedichteten Raum 12 mit Hilfe des Sensors 42 aufrecht. Diese steuert das Gebläse 16 bzw. den Antriebsmotor dafür so an, daß ein vorgegebener Unterdruck aufrecht erhalten wird, wobei über die Öffnung 18 Luft aus der Umgebung in den abgedichteten Raum 12 eingetragen wird. Fällt aus bestimmten Gründen der Antriebsmotor für das Gebläse 16 aus oder erleidet die Steuerung des Antriebsmotors einen Defekt, wird dies vom Sensor 42 festgestellt und an die Unterdruckregeleinheit gemeldet. Diese betätigt darauf die Ventile 38a und 20 über die zugeordneten elektrischen Betätigungen 40 und 22, so daß das Ventil 20 schließt und das Ventil 38a geöffnet wird. Dadurch entsteht ein Druck an der Betätigung 30 des Ventils 38 und der Betätigung 34 des Ventils 32. Ersteres Ventil wird geöffnet und zweites geschlossen. Die Druckleitung 36 liegt außerdem am Treibeingang des Ejektors 26, wodurch in dem Ejektor 26, der in der Art einer Venturidüse aufgebaut ist, ein Treibstrahl erzeugt wird, der am Ansaugeingang einen Unterdruck erzeugt. Dieser Unterdruck teilt sich dem abgedichteten Raum 12 mit. Mit Hilfe des Ejektors 26 läßt sich daher im abgedichteten Raum 12 ein bestimmter Unterdruck aufrecht erhalten. Die Zeit, in der ein Unterdruck aufrecht erhalten werden kann, auch wenn der Ejektor 26 nur durch einen begrenzten Druckspeicher versorgt wird, reicht üblicherweise aus, damit das Personal im Produktionsraum diesen verlassen kann, um den toxischen Stoffen nicht ausgesetzt zu werden.During normal production operation, valves 38a and 28 are closed and valves 32 and 20 are opened. The control device shown maintains a certain negative pressure in the sealed space 12 by means of the sensor 42 upright. This controls the fan 16 and the drive motor for so that a predetermined negative pressure is maintained, being introduced via the opening 18 air from the environment in the sealed space 12. If for certain reasons the drive motor for the blower 16 fails or if the control of the drive motor suffers a defect, this is detected by the sensor 42 and reported to the vacuum control unit. This actuates thereon the valves 38a and 20 via the associated electrical actuations 40 and 22, so that the valve 20 closes and the valve 38a is opened. This creates a pressure on the actuator 30 of the valve 38 and the actuator 34 of the valve 32. The first valve is opened and the second closed. The pressure line 36 is also located at the drive input of the ejector 26, whereby in the ejector 26, which is constructed in the manner of a venturi, a driving jet is generated, which generates a negative pressure at the suction inlet. This negative pressure is communicated to the sealed space 12. With the help of the ejector 26 can therefore be maintained in the sealed space 12, a certain negative pressure. The time in which a negative pressure can be maintained, even if the ejector 26 is supplied only by a limited pressure accumulator, is usually sufficient so that the staff in the production room can leave this, so as not to be exposed to the toxic substances.

Claims (2)

  1. A device for generating a negative pressure in the sealed room (12) of a tablet press and/or of an isolator, with a fan (16) connected to the sealed room (12) via a suction duct (14) and an fresh air inlet opening (18) towards the sealed room, wherein the intake side of an ejector (26) is connected with the sealed room (12), the working fluid connection of which is connectable with a compressed air source via a first valve (38a) and a pressure duct (36), with a sensor (42) in the sealed room (12), the sensor (42) which is connected to a negative pressure control unit (44) which triggers the first valve (38a), wherein a second valve (20) is assigned to the fresh air inlet opening (18) which is triggerable by the negative pressure control unit (44), wherein further the negative pressure control unit (44) is formed such that during fan failure it sustains a determined negative pressure in the sealed room (12) by means of the sensor (42) while the valve (20) is closable and valve (38a) is of open type via the assigned electric actuating appliances (22, 40), wherein further the intake side of the ejector (26) is connected to the intake duct (14) of the fan (16) via a branch duct (24), a third valve (32) is disposed between a connecting point of the branch duct (24) and the fan (16), a fourth valve (28) is disposed in the branch duct (14), wherein the actuating appliances (34, 30) of the third and fourth valves (32 and 28) are fluid-actuated and the actuating appliances (34, 30) of the third and fourth valve (32, 28) are connected to the pressure duct (36) leading to the ejector (26) at the downstream side of the first valve (38a).
  2. Device according to claim 1, characterised in that the second valve (20) is formed such that it opens in the state not triggered by the negative pressure control unit (44), and the second valve (38a) is formed such that it closes in the state not triggered by the negative pressure control unit (44).
EP06025286A 2005-12-23 2006-12-07 Device for generating a reduced pressure in an enclosed space of a tabletting press and/or an isolator Not-in-force EP1803508B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005061787A DE102005061787A1 (en) 2005-12-23 2005-12-23 Device for generating a negative pressure in the sealed space of a tablet press and / or an insulator

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EP1803508A2 EP1803508A2 (en) 2007-07-04
EP1803508A3 EP1803508A3 (en) 2008-07-30
EP1803508B1 true EP1803508B1 (en) 2013-02-13

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Also Published As

Publication number Publication date
EP1803508A2 (en) 2007-07-04
DE102005061787A1 (en) 2007-06-28
US7749053B2 (en) 2010-07-06
US20070149108A1 (en) 2007-06-28
EP1803508A3 (en) 2008-07-30

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