EP1276541A1 - Volumetric control for blower filter devices - Google Patents

Volumetric control for blower filter devices

Info

Publication number
EP1276541A1
EP1276541A1 EP01933612A EP01933612A EP1276541A1 EP 1276541 A1 EP1276541 A1 EP 1276541A1 EP 01933612 A EP01933612 A EP 01933612A EP 01933612 A EP01933612 A EP 01933612A EP 1276541 A1 EP1276541 A1 EP 1276541A1
Authority
EP
European Patent Office
Prior art keywords
measuring points
fan
behind
volume control
measuring
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.)
Granted
Application number
EP01933612A
Other languages
German (de)
French (fr)
Other versions
EP1276541B1 (en
Inventor
Thomas KRÜGERKE
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.)
MSA Auer GmbH
Original Assignee
MSA Auer 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 MSA Auer GmbH filed Critical MSA Auer GmbH
Publication of EP1276541A1 publication Critical patent/EP1276541A1/en
Application granted granted Critical
Publication of EP1276541B1 publication Critical patent/EP1276541B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/006—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort with pumps for forced ventilation

Definitions

  • the invention relates to a volume control for blower filter devices, which is particularly suitable for a hood connection for ventilation.
  • Blower filter devices according to the known prior art have the problem that the flow rate of the air that is supplied to the hood varies depending on the degree of clogging of the filter. If the filter is new and clean, more air will pass through the filter than required by the standards in a given individual case. Similar problems arise when using different filters.
  • Another problem is that the air volume flow is influenced by the type of breathing connection.
  • EP 0352938 A2 proposes to measure the difference zdrack between a measuring point in front of and a measuring point behind the fan wheel of the fan and to use this signal to control the fan speed.
  • EP 0 62 10 56 AI provides for the back pressure to be measured at the outlet of the blower filter device.
  • the dynamic pressure is generated by the flow resistance of the hood and can also serve as a measure of the air volume flow.
  • another sensor in the form of a thermistor in a secondary duct, which is to monitor the specified limit values for the air volume flow and to trigger an alarm signal when the temperature falls below.
  • FI 80606 From FI 80606 an arrangement is known which uses the fan motor as a detector, so that the electrical control circuit measures the current required by the fan motor and the effective voltage at its poles.
  • the arrangement uses the properties centrifugal fan such that the flow rate of the air flowing through the fan per unit of time is proportional to the torque of the rotor and, moreover, the pressure difference is proportional to the speed of rotation.
  • This solution is further developed by DE 195 02 360 AI in such a way that the performance of the fan is regulated on the basis of the current and the rotational speed of the fan.
  • the object of the invention is to keep the volume flow constant within limit ranges regardless of the filters and hoods used. This object is achieved with the characterizing features of claim 1, advantageous embodiments are the subject of the dependent claims.
  • the invention provides that at least two measuring points in the air flow behind the fan wheel and in front of the consumer, in particular the respiratory protection hood are arranged.
  • the measuring points in the air flow are located inside the housing filter device behind the fan wheel and in front of the fan filter device outlet.
  • the pressure measuring sensors as well as the control technology with energy supplier can be optimally combined with the blower filter unit in a compact unit.
  • the pressure difference is compared in the control unit with predefined limit values. If the pressure difference is outside the specified limit values, a change in the fan output attempts to regulate the air volume flow to the desired level (e.g. 125 1 / min to 140 1 / min). If this does not succeed, a signaling device is activated which warns the user. This can be done via a measuring device which is coupled to the fan in such a way that the signal device is activated when the limit values of the fan power are exceeded or fallen below, or the signal device is coupled to the control unit in such a way that it is activated when a predetermined differential pressure exceeds - or falls below.
  • a measuring device which is coupled to the fan in such a way that the signal device is activated when the limit values of the fan power are exceeded or fallen below, or the signal device is coupled to the control unit in such a way that it is activated when a predetermined differential pressure exceeds - or falls below.
  • the volume control for blower filter devices consists of measuring points 1, 2, which are located in the air flow within the housing filter device behind the air wheel 3 and in front of the blower filter device outlet to the breathing hose 8.
  • Pressure sensors are arranged at the measuring points 1, 2, the differential pressure of which is determined by a control unit 5 and converted into a control signal for the fan power. If leveling of the air volume flow to a desired level is not possible in this way, a signal device 6 is activated.

Landscapes

  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Compressor (AREA)
  • Measuring Volume Flow (AREA)
  • Control Of Electric Motors In General (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

The invention relates to a volumetric control for blower filter devices in which a control unit ( 5 ) determines a differential pressure between measuring points ( 1, 2 ) that is converted into a control signal for the fan output. To this end, at least two measuring points ( 1, 2 ) are arranged in the airflow behind the fan impeller ( 3 ) and in front of the consumer, in particular, the breathing hood ( 4 ). The measuring points ( 1, 2 ) can be located in the airflow inside the case filter device behind the impeller wheel ( 3 ) and in front of the outlet of the blower filter device or one measuring point is placed in the airflow inside the housing of the case filter device behind the impeller wheel ( 3 ) and one is placed in the vicinity of the connection of the breathing hood ( 4 ) or both measuring points are located in the breathing hose ( 8 ).

Description

Nolumensteuerung für GeblasefiltergerateVolume control for blower filter devices
Die Erfindung betrifft eine Nolumensteuerung für Geblasefiltergerate, die insbesondere geeignet ist für einen Haubenanschluss zur Beatmung.The invention relates to a volume control for blower filter devices, which is particularly suitable for a hood connection for ventilation.
Geblasefiltergerate nach dem bekannten Stand der Technik weisen das Problem auf, dass die Durchflussmenge der Luft, die der Haube zugef hrt wird, in Abhängigkeit vom Grad der Verstopfung des Filters variiert. Wenn der Filter neu und sauber ist, durchtritt den Filter mehr Luft als nach den Standards in einem gegebenen Einzelfall benötigt. Ähnliche Probleme treten auf, wenn unterschiedliche Filter verwendet werden sollen.Blower filter devices according to the known prior art have the problem that the flow rate of the air that is supplied to the hood varies depending on the degree of clogging of the filter. If the filter is new and clean, more air will pass through the filter than required by the standards in a given individual case. Similar problems arise when using different filters.
Die daraus entstehenden Nachteile bedingen einen überhöhten Verbrauch von Strom und einen überhöhten Luftdurchsatz. Darüber hinaus besteht beim Zusetzen der Filter das Problem, dass es nicht bekannt ist, wann der Durchfluss der der Haube zugeführten Luft unter die benötigte Durchflussmenge abfällt.The resulting disadvantages result in an excessive consumption of electricity and an excessive air throughput. In addition, when the filters are clogged, there is the problem that it is not known when the flow of the air supplied to the hood falls below the required flow rate.
Ein weiteres Problem besteht darin, dass der Luftvolumenstrom durch die Art des Atemanschlusses beeinflusst wird.Another problem is that the air volume flow is influenced by the type of breathing connection.
Um hier Abhilfe zu schaffen, wurden verschiedene Arten der Nolumensteuerung konzi- piert.In order to remedy this, various types of volume control have been designed.
Mit der EP 0352938 A2 wird vorgeschlagen, den Differe zdrack zwischen einem Messpunkt vor und einem Messpunkt hinter dem Lüfterrad des Gebläses zu messen und dieses Signal zur Steuerung der Lüfterdrehzahl zu nutzen.EP 0352938 A2 proposes to measure the difference zdrack between a measuring point in front of and a measuring point behind the fan wheel of the fan and to use this signal to control the fan speed.
Die EP 0 62 10 56 AI sieht vor, den Staudruck am Ausgang des Gebläsefϊltergerätes zu messen. Der Staudruck wir durch den Strömungswiderstand der Haube erzeugt und kann ebenso als ein Maß für den Luftvolumenstrom dienen. Darüber hinaus ist hier in einem Νebenkanal ein weiterer Sensor in Form eines Thermistors vorhanden, der vorgegebene Grenzwerte des Luftvolumenstroms überwachen soll und beim Unterschreiten ein Alarm- signal auslöst.EP 0 62 10 56 AI provides for the back pressure to be measured at the outlet of the blower filter device. The dynamic pressure is generated by the flow resistance of the hood and can also serve as a measure of the air volume flow. In addition, there is another sensor in the form of a thermistor in a secondary duct, which is to monitor the specified limit values for the air volume flow and to trigger an alarm signal when the temperature falls below.
Aus der FI 80606 ist eine Anordnung bekannt, die den Lüftermotor als Detektor benutzt, so dass die elektrische Steuerungsschaltung den von dem Lüftermotor benötigten Strom und die effektive Spannung an seinen Polen misst. Die Anordnung verwendet die Eigenschaf- ten des Zentrifugallüfters derart, dass die Durchflussmenge der Luft, die je Zeiteinheit durch den Lüfter fließt, proportional zu dem Drehmoment des Rotors und darüber hinaus die Druckdifferenz proportional zur Umdrehungsgeschwindigkeit ist. Diese Lösung wird durch die DE 195 02 360 AI dahingehend weiterentwickelt, dass die Leistung des Lüfters auf Basis des Stromes und der Rotationsgeschwindigkeit des Lüfters reguliert wird.From FI 80606 an arrangement is known which uses the fan motor as a detector, so that the electrical control circuit measures the current required by the fan motor and the effective voltage at its poles. The arrangement uses the properties centrifugal fan such that the flow rate of the air flowing through the fan per unit of time is proportional to the torque of the rotor and, moreover, the pressure difference is proportional to the speed of rotation. This solution is further developed by DE 195 02 360 AI in such a way that the performance of the fan is regulated on the basis of the current and the rotational speed of the fan.
Trotz dieser umfänglichen Entwicklung ist es bisher nicht gelungen, den Luftvolumenstrom unabhängig von den verwendeten Filtern und Hauben innerhalb von Grenzbereichen konstant zu halten. Die Staudruckmessung hinter dem Lüfter bzw. die Unterdruckmessung hinter dem Filter können nur als Maß für den Nolumenstrom verwendet werden, wenn die Strömungswiderstände der Haube bzw. der Filter bekannt sind. Für die praktische Anwendung bedeutet dies, dass die Strömungswiderstände der Filter und Hauben bereits in der Produktion in engen Grenzen konstant gehalten werden müssen, damit diese Methoden funktionieren.Despite this extensive development, it has so far not been possible to keep the air volume flow constant within limit ranges, regardless of the filters and hoods used. The dynamic pressure measurement behind the fan or the negative pressure measurement behind the filter can only be used as a measure of the volume flow if the flow resistances of the hood or the filter are known. For practical use, this means that the flow resistances of the filters and hoods must be kept constant within narrow limits during production for these methods to work.
Aufgabe der Erfindung ist es, unabhängig von den verwendeten Filtern und Hauben innerhalb von Grenzbereichen den Volumenstrom konstant zu halten. Gelöst wird diese Aufgabe mit den kennzeichnenden Merkmalen des Anspruchs 1, vorteilhafte Ausgestaltungen sind Gegenstand der Unteransprüche.The object of the invention is to keep the volume flow constant within limit ranges regardless of the filters and hoods used. This object is achieved with the characterizing features of claim 1, advantageous embodiments are the subject of the dependent claims.
Die Erfindung sieht für die Nolumensteuerung von Gebläsefiltergeräten, bei der ein Differenzdruck zwischen Messpunkten durch eine Steuereinheit ermittelt und in ein Steuersignal für die Lüfterleistung umgewandelt wird, vor, dass mindestens zwei Messpunkte im Luftstrom hinter dem Lüfterrad und vor dem Verbraucher, insbesondere der Atemschutz- haube, angeordnet sind.For the volume control of fan filter devices, in which a differential pressure between measuring points is determined by a control unit and converted into a control signal for the fan power, the invention provides that at least two measuring points in the air flow behind the fan wheel and in front of the consumer, in particular the respiratory protection hood are arranged.
In einer Reihe von Versuchen konnte festgestellt werden, dass bei dieser Messpunktanordnung die Druckdiffernz abhängig ist vom Luftvolumenstrom, jedoch weitestgehend unabhängig vom Strömungswiderstand des oder der Filter und des Atemanschlusses. In einer bevorzugten Ausführung befinden sich die Messpunkte im Luftstrom innerhalb des Gehausefiltergerates hinter dem Lüfterrad und vor dem Gebläsefiltergeräteausgang. Die Druckmesssensoren sowie die Steuerungstechnik mit Energieversorger lassen sich so optimal mit den Gebläsefϊltergerät in einer kompakten Einheit zusammenfassen. Möglich ist aber auch eine Anordnung eines Meßpunktes hinter dem Lüfterrad und eines Meßpunktes vor dem Atemanschluss im Atemschlauch oder beider Messpunkte im Atemschlauch. Vorteilhaft ist es dabei immer, wenn der Abstand der Messpunkte innerhalb der benannten Luftstrombereiche den technisch realisierbaren größtmöglichsten Wert auf- weist.In a series of experiments it was possible to determine that with this measuring point arrangement the pressure difference depends on the air volume flow, but is largely independent of the flow resistance of the filter or filters and the breathing connection. In a preferred embodiment, the measuring points in the air flow are located inside the housing filter device behind the fan wheel and in front of the fan filter device outlet. The pressure measuring sensors as well as the control technology with energy supplier can be optimally combined with the blower filter unit in a compact unit. However, it is also possible to arrange a measuring point behind the fan wheel and a measuring point in front of the breathing connection in the breathing tube or both measuring points in the breathing tube. It is always advantageous if the distance between the measuring points within the specified airflow ranges has the greatest possible technically realizable value.
Die Druckdifferenz wird in der Steuereinheit mit vorgegebenen Grenzwerten verglichen. Liegt die Druckdifferenz außerhalb vorgegebener Grenzwerte, wird durch eine Änderung der Lüfterleistung versucht, den Luftvolumenstrom auf das gewollte Maß (z.B. 125 1/min bis 140 1/min) einzupegeln. Gelingt dies nicht, wird eine Signaleinrichtung aktiviert, die den Benutzer warnt. Dies kann über eine Messeinrichtung erfolgen, die mit dem Lüfter derart gekoppelt ist, dass beim Über- und Unterschreiten von Grenzwerten der Lüfterleistung die Signaleinrichtung aktiviert wird, oder die Signaleinrichtung ist mit der Steuereinheit derart gekoppelt, dass diese aktiviert wird, wenn ein vorgegebener Differenzdruck über- oder unterschritten wird.The pressure difference is compared in the control unit with predefined limit values. If the pressure difference is outside the specified limit values, a change in the fan output attempts to regulate the air volume flow to the desired level (e.g. 125 1 / min to 140 1 / min). If this does not succeed, a signaling device is activated which warns the user. This can be done via a measuring device which is coupled to the fan in such a way that the signal device is activated when the limit values of the fan power are exceeded or fallen below, or the signal device is coupled to the control unit in such a way that it is activated when a predetermined differential pressure exceeds - or falls below.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt. Die Volumensteuerung für Geblasefiltergerate besteht aus den Messpunkten 1, 2, die sich im Luftstrom innerhalb des Gehausefiltergerates hinter dem Lufterrad 3 und vor dem Gebläsefiltergerä- teausgang zum Atemschlauch 8 befinden. An den Messpunkten 1, 2 sind Drucksensoren angeordnet, deren Differenzdruck durch eine Steuereinheit 5 ermittelt und in ein Steuersignal für die Lüfterleistung umgewandelt wird. Ist auf diese Weise ein Einpegeln des Luftvolumenstroms auf ein gewolltes Maß nicht möglich, wird eine Signaleinrichtung 6 aktiviert.An embodiment of the invention is shown in the drawing. The volume control for blower filter devices consists of measuring points 1, 2, which are located in the air flow within the housing filter device behind the air wheel 3 and in front of the blower filter device outlet to the breathing hose 8. Pressure sensors are arranged at the measuring points 1, 2, the differential pressure of which is determined by a control unit 5 and converted into a control signal for the fan power. If leveling of the air volume flow to a desired level is not possible in this way, a signal device 6 is activated.
Bei dieser Messpunktanordnung ist die Druckdiffernz abhängig vom Luftvolumenstrom, jedoch weitestgehend unabhängig vom Strömungswiderstand des oder der Filter 7 und des Atemanschlusses für die Atemschutzhaube 4. Dies ermöglicht es, den Volumenstrom unabhängig von den verwendeten Filtern 7 und den Atemanschlüssen für Atemschutzhauben 4 innerhalb von Grenzbereichen konstant zu halten. BezugszeichenlisteWith this measuring point arrangement, the pressure difference is dependent on the air volume flow, but is largely independent of the flow resistance of the filter or filters 7 and the breathing connection for the respiratory protection hood 4. This makes it possible for the volume flow to be constant within limit ranges, regardless of the filters 7 used and the breathing connections for the breathing protection hood 4 to keep. LIST OF REFERENCE NUMBERS
1 Messpunkt1 measuring point
2 Messpunkt 3 Lüfterrad2 measuring point 3 fan wheel
4 Atemschutzhaube4 respiratory protection hood
5 Steuereinheit5 control unit
6 Signaleinrichtung6 signaling device
7 Filter 8 Atemschlauch 7 filter 8 breathing tube

Claims

Patentansprüche claims
1. Volumensteuerung für Geblasefiltergerate, bei der ein Differenzdruck zwischen Messpunkten durch eine Steuereinheit ermittelt und in ein Steuersignal für die Lüfter- leistung umgewandelt wird, dadurch gekennzeichnet, dass1. Volume control for blower filter devices in which a differential pressure between measuring points is determined by a control unit and converted into a control signal for the fan power, characterized in that
mindestens zwei Messpunkte (1, 2) im Luftstrom hinter dem Lüfterrad (3) und vor dem Verbraucher, insbesondere der Atemschutzhaube (4), angeordnet sind.at least two measuring points (1, 2) are arranged in the air flow behind the fan wheel (3) and in front of the consumer, in particular the respiratory protection hood (4).
2. Volumensteuerung nach Anspruch 1 , dadurch gekennzeichnet, dass2. Volume control according to claim 1, characterized in that
die Messpunkte (1, 2) sich im Luftstrom innerhalb des Gehausefiltergerates hinter dem Lüfterrad (3) und vor dem Gebläsefiltergeräteausgang befinden, oder ein Messpunkt im Luftstrom innerhalb des Gehausefiltergerates hinter dem Lüfterrad (3) und einer im Bereich des Anschlusses der Atemschutzhaube (4) angeordnet ist, oder sich beide Messpunkte im Atemschlauch (8) befinden.the measuring points (1, 2) are located in the air flow inside the housing filter device behind the fan wheel (3) and in front of the blower filter device outlet, or one measuring point in the air flow inside the housing filter device behind the fan wheel (3) and one in the area of the connection of the respiratory protection hood (4) is arranged, or both measuring points are in the breathing tube (8).
3. Volumensteuerung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass3. Volume control according to claim 1 or 2, characterized in that
der Abstand der Messpunkte (1, 2) innerhalb der benannten Luftstrombereiche den technisch realisierbaren größtmöglichsten Wert aufweist.the distance between the measuring points (1, 2) within the specified airflow ranges has the greatest technically feasible value.
4. Volumensteuerung nach Anspruch 1, dadurch gekennzeichnet, dass4. Volume control according to claim 1, characterized in that
eine Signaleinrichtung (6) vorhanden ist, die über eine Messeinrichtung mit dem Lüfter (3) derart gekoppelt ist, dass beim Über- und Unterschreiten von Grenzwerten der Lüfterleistung diese aktiviert ist. Volumensteuerung nach Anspruch 1 , dadurch gekennzeichnet, dassthere is a signal device (6) which is coupled to the fan (3) via a measuring device in such a way that when the limit values of the fan power are exceeded and fallen below, this is activated. Volume control according to claim 1, characterized in that
eine Signaleinrichtung (6) vorhanden ist, die mit der Steuereinheit (5) derart gekoppelt ist, dass die Signaleinrichtung (6) aktiviert ist, wenn ein vorgegebener Differenzdruck über- oder unterschritten wird. there is a signal device (6) which is coupled to the control unit (5) in such a way that the signal device (6) is activated when a predetermined differential pressure is exceeded or fallen below.
EP01933612A 2000-04-27 2001-04-06 Volumetric control for blower filter devices Expired - Lifetime EP1276541B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10021581 2000-04-27
DE2000121581 DE10021581B4 (en) 2000-04-27 2000-04-27 Volume control for fan filter units
PCT/DE2001/001456 WO2001080952A1 (en) 2000-04-27 2001-04-06 Volumetric control for blower filter devices

Publications (2)

Publication Number Publication Date
EP1276541A1 true EP1276541A1 (en) 2003-01-22
EP1276541B1 EP1276541B1 (en) 2008-11-05

Family

ID=7640673

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01933612A Expired - Lifetime EP1276541B1 (en) 2000-04-27 2001-04-06 Volumetric control for blower filter devices

Country Status (6)

Country Link
US (1) US6953318B2 (en)
EP (1) EP1276541B1 (en)
AT (1) ATE413213T1 (en)
AU (2) AU2001260062B2 (en)
DE (2) DE10021581B4 (en)
WO (1) WO2001080952A1 (en)

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Also Published As

Publication number Publication date
AU2001260062B2 (en) 2005-08-18
DE10021581B4 (en) 2005-01-13
DE50114472D1 (en) 2008-12-18
DE10021581A1 (en) 2001-11-15
ATE413213T1 (en) 2008-11-15
EP1276541B1 (en) 2008-11-05
AU6006201A (en) 2001-11-07
WO2001080952A1 (en) 2001-11-01
US6953318B2 (en) 2005-10-11
US20030180149A1 (en) 2003-09-25

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