WO2011069805A1 - Mixing fan - Google Patents
Mixing fan Download PDFInfo
- Publication number
- WO2011069805A1 WO2011069805A1 PCT/EP2010/067794 EP2010067794W WO2011069805A1 WO 2011069805 A1 WO2011069805 A1 WO 2011069805A1 EP 2010067794 W EP2010067794 W EP 2010067794W WO 2011069805 A1 WO2011069805 A1 WO 2011069805A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blower
- impeller
- housing
- fan
- blower according
- 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.)
- Ceased
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
- F23D14/36—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air in which the compressor and burner form a single unit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details
- F23D14/62—Mixing devices; Mixing tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/083—Sealings especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/40—Organic materials
- F05D2300/43—Synthetic polymers, e.g. plastics; Rubber
Definitions
- the present invention relates to a fan with a housing and an impeller arranged on a motor shaft, which can be driven by a motor.
- the blower according to the invention is also designed specifically as a mixing fan for conveying and mixing of combustible media with air, with which usually the combustible or explosive mixture is conveyed to a burner.
- the invention relates to the use of an insulating fan impeller in a mixing fan for conveying and mixing a combustible medium with air, wherein preferably gas is used as the combustible medium.
- the blowers according to the invention are preferably used in heating technology.
- electrostatic charges of the fan components, in particular of the housing and of the fan wheel the danger of a sparking and possibly of it resulting ignition of the mixture within the blower, which is safe to avoid.
- the measures provided for in the prior art are cost-intensive, structurally complex and sometimes difficult to recycle.
- blower wheel or the housing in the case of mixing blowers, ie plastics which have been compounded with conductive materials such as carbon black or carbon, in order thus to achieve a conductive component.
- conductive materials such as carbon black or carbon
- blower wheels made of compound materials used in the prior art are capable of dissipating, and components with an applied antistatic surface coating are conductive or conductive. It is the object of the present invention to provide a more cost effective blower that is more recyclable.
- a fan designed as a mixing fan for conveying and mixing a combustible medium with air comprises an impeller which is designed to be insulating.
- the impeller can be mounted without grounding and can be operated during operation without additionally provided grounding. It is particularly advantageous if the impeller is arranged groundless on the motor shaft. In a preferred embodiment, the impeller is of a sorted type
- Plastic preferably polyamide, is formed, whereby in the present case a plastic without compounding is understood to mean "unmixed.” However, it is possible to color the plastic without departing from the scope of protection of the term "pure”.
- this preferably has a surface resistance Ro of at least 10 9 ⁇ . Also protected are materials with a surface resistance R 0 of 10 10 , 10 11 , 10 12 ⁇ with all intermediate values.
- the measurement of the surface resistance can be done for example by a tera-ohmmeter LEM Unilab 5 kV, but also test methods according to DIN IEC 6093 are possible.
- the blower according to the invention can have an overall surface of the blower wheel, formed from blower surface and blower fan, in the range between 25 cm 2 and 500 cm 2 , preferably between 25 and 400 cm 2 , more preferably between 25 and 300 cm 2 preferably between 25 and 200 cm 2 , more preferably between 25 and 150 cm 2 , wherein a charge up to voltage levels that could cause an ignition within the blower, are not achieved.
- the total surface area of the housing may range between 25 cm 2 and 1000 cm 2 .
- the at least one shaft bearing and / or the motor shaft and / or the shaft seal can likewise be embodied insulated in order to minimize discharges from charges via the shaft bearing.
- the use of an insulating shaft seal makes it possible to use a simpler and sorted seal.
- the gas is supplied in the intake area.
- By mixing the gas in the intake higher heat outputs can be achieved because due to the negative pressure in the blower more gas can be added.
- the impeller advantageous characteristics apply mutatis mutandis for the housing of the blower, which can be made insulating, earth-free operable and can be formed from sorted plastic.
- Both the housing and the impeller can be manufactured by injection molding. It is also possible to use a conventional metal housing made of die-cast, for example made of aluminum, and an inventive Use blower wheel. The invention therefore also includes the use of an insulating impeller in any mixing fan.
- conductive components have always been used to exclude the device itself as the ignition source of the explosive fuel-air mixture.
- an ignition voltage of 1000-2000V is sufficient to realize the ignition.
- gases commonly used in Europe there must already be more than 3000V ignition voltage to allow ignition.
- the insulating fan and / or blower housing used according to the invention can also charge due to the flow within the fan and optionally in the intake air dust particles (in extreme cases up to 800 pg / m 3 ) at high speed of over 6500 U / min
- the values achieved are well below the critical ignition values, so that a grounding unnecessary and accidental ignition due to static electricity within the fan is still excluded.
- the possibly occurring minimal charges discharge themselves independently without further action within a very short time.
- an electric field meter PFM-711A can be used to measure the charges or to determine the surface potential.
- the blower is followed by a burner, which acts as a flame arrester.
- the explosive volume of the atmosphere within the blower is less than 10 liters and greater than 0.05 liters.
- FIG. 1 shows a cross section through a blower according to the prior art
- FIG. 1 shows a cross-section of a blower with a housing 1, an impeller 2 arranged therein, which is arranged on a motor shaft 3, where is mounted at the motor shaft by means of a bearing system 5. Further, a shaft seal 4 is provided, in which the bearing 5 is inserted. All components are designed to be conductive or conductive, so that charges are conducted from the impeller 2 to the housing 1 and are discharged via a ground (not shown). The elaborate dissipation of the charge is shown by arrows. The charges on the impeller 2 are directed to the motor shaft 3 and from this passes through the bearing 5 via the shaft seal 4 to the housing 1.
- the blower according to the invention overcomes the disadvantages of the prior art and, due to the insulating design of at least the blower wheel, enables a cost-effective solution to requirements that have always existed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Mischgebläse mixing fan
Beschreibung: Description:
Die vorliegende Erfindung betrifft ein Gebläse mit einem Gehäuse und einem auf einer Motorwelle angeordneten Gebläserad, das über einen Motor angetrieben werden kann. Das erfindungsgemäße Gebläse ist ferner speziell als Mischgebläse zur Förderung und Mischung von brennbaren Medien mit Luft ausge- bildet, mit dem üblicherweise das brennbare bzw. explosive Gemisch zu einem Brenner gefördert wird. The present invention relates to a fan with a housing and an impeller arranged on a motor shaft, which can be driven by a motor. The blower according to the invention is also designed specifically as a mixing fan for conveying and mixing of combustible media with air, with which usually the combustible or explosive mixture is conveyed to a burner.
Ferner betrifft die Erfindung die Verwendung eines isolierend ausgebildeten Gebläserads in einem Mischgebläse zur Förderung und Mischung eines brennbaren Mediums mit Luft, wobei als brennbares Medium vorzugsweise Gas ver- wendet wird. Die Gebläse gemäß der Erfindung werden vorzugsweise in der Heiztechnik eingesetzt. In diesem Zusammenhang wird dem Durchschnittsfachmann im vorliegenden Gebiet seit jeher gelehrt, dass während des Einsatzes derartiger Gebläse und der Förderung von explosivem Gas-Luft-Gemischen elektrostatische Aufladungen der Gebläsebauteile, insbesondere des Gehäuses und des Gebläserades, die Gefahr einer Funkenbildung und einer sich daraus gegebenenfalls ergebenden Zündung des Gemischs innerhalb des Gebläses besteht, die sicher zu vermeiden ist. Die dafür im Stand der Technik vorgesehenen Vorkehrungen sind jedoch kostenintensiv, konstruktiv aufwendig und teilweise schwer zu recy- celn. Furthermore, the invention relates to the use of an insulating fan impeller in a mixing fan for conveying and mixing a combustible medium with air, wherein preferably gas is used as the combustible medium. The blowers according to the invention are preferably used in heating technology. In this connection, it has always been taught to the average person skilled in the art that during the use of such fans and the promotion of explosive gas-air mixtures, electrostatic charges of the fan components, in particular of the housing and of the fan wheel, the danger of a sparking and possibly of it resulting ignition of the mixture within the blower, which is safe to avoid. However, the measures provided for in the prior art are cost-intensive, structurally complex and sometimes difficult to recycle.
Beispielsweise wird im Stand der Technik vorgeschlagen, zur Ableitung von Aufladungen des Gebläserads eine Erdung über die Motorwelle, über das Wellenlager und die Wellendichtung bis zu dem selbstgeerdeten Gehäuse vorzusehen. Eine derartige Ableitung ist zum Beispiel in der DE 102 04 037 A1 offen- bart. For example, it is proposed in the prior art to provide grounding via the motor shaft, via the shaft bearing and the shaft seal up to the self-grounded housing to dissipate charges from the impeller. Such a derivative is disclosed, for example, in DE 102 04 037 A1.
Aus der DE 102 004 045 251 A1 wird dem Fachmann gelehrt, das Gebläsegehäuse bzw. das Gebläserad mit einer antistatischen, ableitfähigen oder leitfähigen Oberflächenbeschichtung zu versehen, um somit eine Erdung aller leitfähigen Gebläsebauteile zu gewährleisten. Das Aufbringen einer derartigen Be- Schichtung ist jedoch als zusätzlicher Herstellungsschritt (beispielsweise durch Lackieren) kostenintensiv und wird in der Praxis in der Regel nicht durchgeführt. DE 102 004 045 251 A1 teaches the person skilled in the art to provide the fan housing or the fan wheel with an antistatic, dissipative or conductive surface coating in order thus to ensure grounding of all conductive fan components. The application of such a coating, however, is expensive as an additional manufacturing step (for example by painting) and is generally not carried out in practice.
Ferner ist bekannt, bei Mischgebläsen sogenannte Compound-Werkstoffe für das Gebläserad oder das Gehäuse vorzusehen, d.h. Kunststoffe, die mit leitfähigen Materialien wie Ruß oder Carbon compoundiert wurden, um somit ein leitfähiges Bauteil zu erzielen. Derartige Compound-Werkstoffe sind jedoch teurer und schwieriger herstellbar. Ferner können sie schlecht recycelt werden, da die beigemischten leitenden Werkstoffe nicht mehr sortenrein zerlegt werden können. Die im Stand der Technik verwendeten Gebläseräder aus Compound- Werkstoffen sind ableitfähig, Bauteile mit aufgebrachter antistatischer Oberflä- chenbeschichtung sind ableitfähig oder leitfähig. Es ist die Aufgabe der vorliegenden Erfindung, ein kostengünstigeres Gebläse bereitzustellen, das besser recycelbar ist. It is also known to provide so-called compound materials for the blower wheel or the housing in the case of mixing blowers, ie plastics which have been compounded with conductive materials such as carbon black or carbon, in order thus to achieve a conductive component. However, such compound materials are more expensive and difficult to produce. Furthermore, they can be poorly recycled because the admixed conductive materials can no longer be sorted sorted. The blower wheels made of compound materials used in the prior art are capable of dissipating, and components with an applied antistatic surface coating are conductive or conductive. It is the object of the present invention to provide a more cost effective blower that is more recyclable.
Die erfindungsgemäße Aufgabe wird dadurch gelöst, dass ein als Mischgebläse zur Förderung und Mischung eines brennbaren Mediums mit Luft ausgebildetes Gebläse ein Gebläserad umfasst, das isolierend ausgebildet ist. The object according to the invention is achieved in that a fan designed as a mixing fan for conveying and mixing a combustible medium with air comprises an impeller which is designed to be insulating.
Gemäß der Berufsgenossenschaft der chemischen Industrie in Deutschland sind Stoffe oder Materialien„isolierend", wenn sie weder leitfähig noch ableitfähig sind. Leitfähig ist demnach ein Stoff oder Material mit spezifischem Widerstand von p .= 104 Ohmmeter ( m). Leitfähig ist ein Stoff oder Material ferner, wenn sein Oberflächenwiderstand R0 ^ 104 Ω beträgt.„Ableitfähig" sind Stoffe oder Materialien mit einem spezifischen Widerstand von mehr als 104 Qm und weniger als 109 Qm bzw. ein Gegenstand oder eine Einrichtung mit einem Oberflächenwiderstand zwischen 104 Ω und 109 Ω gemessen bei 23°C und 50% relativer Luftfeuchte oder mit einem Oberflächenwiderstand zwischen 104 Ω und 1011 Ω gemessen bei 23°C und 30% relativer Luftfeuchte.„Isolierend" gemäß Anspruch 1 bedeutet, dass das Gebläserad aus isolierendem Material gebildet ist. According to the German Employers' Liability Insurance Association, substances or materials are "insulating" if they are neither conductive nor dissipative Conductive is accordingly a substance or material with a specific resistance of p = 10 4 ohmmeter (m) Further, material whose surface resistance is R 0 ^ 10 4 Ω. "Ableitfähig" are materials or materials having a resistivity of more than 10 4 Qm and less than 10 9 Qm or an article or device having a surface resistance between 10 4 Ω and 10 9 Ω measured at 23 ° C and 50% relative humidity or with a surface resistance between 10 4 Ω and 10 11 Ω measured at 23 ° C and 30% relative humidity "Isolierend" according to claim 1 means that the impeller of insulating material is formed.
Günstig ist, dass das Gebläserad erdungsfrei montierbar und im Betrieb auch ohne zusätzlich vorgesehene Erdung betreibbar sein kann. Dabei ist besonders vorteilhaft, wenn das Gebläserad erdungsfrei auf der Motorwelle angeordnet ist. In einer bevorzugten Ausführung ist das Gebläserad aus sortenreinem It is favorable that the impeller can be mounted without grounding and can be operated during operation without additionally provided grounding. It is particularly advantageous if the impeller is arranged groundless on the motor shaft. In a preferred embodiment, the impeller is of a sorted type
Kunststoff, vorzugsweise Polyamid, gebildet, wobei vorliegend unter„sortenrein" ein Kunststoff ohne Compoundierung verstanden wird. Es ist jedoch möglich, den Kunststoff einzufärben, ohne den Schutzbereich des Begriffs„sorten- rein" zu verlassen. Plastic, preferably polyamide, is formed, whereby in the present case a plastic without compounding is understood to mean "unmixed." However, it is possible to color the plastic without departing from the scope of protection of the term "pure".
Zur Gewährleistung der isolierenden Eigenschaften des Gebläserads weist dieses vorzugsweise einen Oberflächenwiderstand Ro von mindestens 109 Ω auf. Ebenfalls geschützt sind demnach Materialien mit einem Oberflächenwiderstand R0 von 1010, 1011 , 1012 Ω mit allen Zwischenwerten. Die Messung des Oberflächenwiderstands kann dabei beispielsweise durch ein Tera-Ohmmeter LEM Unilab 5 kV durchgeführt werden, jedoch sind auch Prüfverfahren nach DIN IEC 6093 möglich. To ensure the insulating properties of the impeller, this preferably has a surface resistance Ro of at least 10 9 Ω. Also protected are materials with a surface resistance R 0 of 10 10 , 10 11 , 10 12 Ω with all intermediate values. The measurement of the surface resistance can be done for example by a tera-ohmmeter LEM Unilab 5 kV, but also test methods according to DIN IEC 6093 are possible.
Das erfindungsgemäße Gebläse kann in einer Ausführung eine Gesamtoberfläche des Gebläserads, gebildet aus Gebläseradoberfläche und Gebläseradun- terf lache im Bereich zwischen 25 cm2 und 500 cm2 aufweisen, vorzugsweise zwischen 25 und 400 cm2, weiter bevorzugt zwischen 25 und 300 cm2, weiter bevorzugt zwischen 25 und 200 cm2, weiter bevorzugt zwischen 25 und 150 cm2, wobei eine Aufladung bis zu Spannungswerten, die eine Zündung innerhalb des Gebläses verursachen könnten, nicht erreicht werden. Die Gesamt- Oberfläche des Gehäuses kann im Bereich zwischen 25 cm2 und 1000 cm2 liegen. In one embodiment, the blower according to the invention can have an overall surface of the blower wheel, formed from blower surface and blower fan, in the range between 25 cm 2 and 500 cm 2 , preferably between 25 and 400 cm 2 , more preferably between 25 and 300 cm 2 preferably between 25 and 200 cm 2 , more preferably between 25 and 150 cm 2 , wherein a charge up to voltage levels that could cause an ignition within the blower, are not achieved. The total surface area of the housing may range between 25 cm 2 and 1000 cm 2 .
Ferner ist es vorteilhaft, dass die mindestens eine Wellenlagerung und/oder die Motorwelle und/oder die Wellendichtung ebenfalls isoliert ausgebildet sein kann/können, um Ableitungen von Aufladungen über die Wellenlagerung zu minimieren. Insbesondere die Verwendung einer isolierenden Wellendichtung ermöglicht es, eine einfachere und sortenreine Dichtung zu verwenden. Furthermore, it is advantageous that the at least one shaft bearing and / or the motor shaft and / or the shaft seal can likewise be embodied insulated in order to minimize discharges from charges via the shaft bearing. In particular, the use of an insulating shaft seal makes it possible to use a simpler and sorted seal.
Bei dem erfindungsgemäßen als Mischgebläse ausgebildeten Gebläse ist ferner vorteilhaft, dass der die Gaszufuhr im Ansaugbereich erfolgt. Durch die Zumischung des Gases im Ansaugbereich können höhere Heizleistungen erzielt werden, da aufgrund des Unterdrucks im Gebläse mehr Gas beigemischt werden kann. Ferner ist dabei günstig, dass die Mischung durch das Laufrad erfolgt und somit per se ein höherer Mischungsgrad und damit einhergehender höherer Modulationsgrad des Gebläses ermöglicht wird. In the case of the blower designed as a mixing fan according to the invention, it is also advantageous that the gas is supplied in the intake area. By mixing the gas in the intake higher heat outputs can be achieved because due to the negative pressure in the blower more gas can be added. Furthermore, it is favorable that the mixing takes place through the impeller and thus per se a higher degree of mixing and concomitant higher degree of modulation of the fan is made possible.
Die oben stehenden, für das Laufrad angeführten vorteilhaften Merkmale gelten mutatis mutandis auch für das Gehäuse des Gebläses, das isolierend ausgebildet, erdungsfrei betreibbar und aus sortenreinem Kunststoff gebildet sein kann. The above, listed for the impeller advantageous characteristics apply mutatis mutandis for the housing of the blower, which can be made insulating, earth-free operable and can be formed from sorted plastic.
Sowohl das Gehäuse als auch das Laufrad können im Spritzgussverfahren gefertigt werden. Auch möglich ist, ein herkömmliches metallenes Gehäuse aus Druckguss, z.B. aus Aluminium, zu verwenden und ein erfindungsgemäßes Gebläserad einzusetzen. Die Erfindung umfasst deshalb gerade auch die Verwendung eines isolierenden Gebläserads in einem beliebigen Mischgebläse. Both the housing and the impeller can be manufactured by injection molding. It is also possible to use a conventional metal housing made of die-cast, for example made of aluminum, and an inventive Use blower wheel. The invention therefore also includes the use of an insulating impeller in any mixing fan.
Bei gemäß dem Stand der Technik verwendeten Mischgebläsen wurden stets leitfähige Bauteile eingesetzt, um das Gerät selbst als Zündquelle des explosi- ven Brennstoff-Luft-Gemisches auszuschließen. Bei der Verwendung von Wasserstoff als Brennstoff genügt bei einer optimierten Elektrode bei optimalen Zündfunken bereits eine Zündspannung von 1000-2000V, um die Zündung zu realisieren. Bei der Verwendung von in Europa üblicherweise verwendeten Gasen müssen jedoch bereits über 3000V Zündspannung vorliegen, um eine Zün- dung zu ermöglichen. Das gemäß der Erfindung verwendete isolierend ausgebildete Gebläseras und/oder Gebläsegehäuse können sich zwar aufgrund der Strömung innerhalb des Gebläses und gegebenenfalls in der Ansaugluft befindlichen Staubpartikeln (im Extremfall bis zu 800 pg/m3) bei hoher Drehzahl von über 6500 U/min ebenfalls aufladen, die erreichten Werte liegen jedoch deutlich unterhalb der kritischen Zündwerte, so dass eine Erdung verzichtbar und eine ungewollte Zündung aufgrund statischer Elektrizität innerhalb des Gebläses dennoch ausgeschlossen ist. Die gegebenenfalls auftretenden minimalen Aufladungen entladen sich selbständig ohne weiteres Zutun innerhalb kürzester Zeit. Zur Messung der Ladungen bzw. zur Ermittlung des Oberflächenpotenzials kann dabei beispielsweise ein Elektrofeldmeter PFM-711A eingesetzt werden. In mixed blending fans used in the prior art, conductive components have always been used to exclude the device itself as the ignition source of the explosive fuel-air mixture. When using hydrogen as fuel with an optimized electrode with optimal ignition spark already an ignition voltage of 1000-2000V is sufficient to realize the ignition. However, when using gases commonly used in Europe, there must already be more than 3000V ignition voltage to allow ignition. Although the insulating fan and / or blower housing used according to the invention can also charge due to the flow within the fan and optionally in the intake air dust particles (in extreme cases up to 800 pg / m 3 ) at high speed of over 6500 U / min However, the values achieved are well below the critical ignition values, so that a grounding unnecessary and accidental ignition due to static electricity within the fan is still excluded. The possibly occurring minimal charges discharge themselves independently without further action within a very short time. For example, an electric field meter PFM-711A can be used to measure the charges or to determine the surface potential.
In einer vorteilhaften Ausführung ist dem Gebläse ein Brenner nachgeschaltet, der als Flammensicherung wirkt. Das explosionsfähige Atmosphärenvolumen innerhalb des Gebläses ist kleiner als 10 Liter und größer als 0,05 Liter. In an advantageous embodiment, the blower is followed by a burner, which acts as a flame arrester. The explosive volume of the atmosphere within the blower is less than 10 liters and greater than 0.05 liters.
In der nachfolgenden Figur ist beispielhaft schematisch der frühere Zustand der Erdung des Laufrads und die Ableitung der Aufladung anhand eines Gebläses im Querschnitt dargestellt. Es zeigt: In the following figure, the previous state of grounding of the impeller and the discharge of the charge by means of a blower in cross-section is exemplified schematically. It shows:
Fig. 1 einen Querschnitt durch ein Gebläse gemäß dem Stand der Technik 1 shows a cross section through a blower according to the prior art
Fig. 1 zeigt einen Querschnitt eines Gebläses mit einem Gehäuse 1 , einem darin angeordneten Gebläserad 2, das auf einer Motorwelle 3 angeordnet ist, wo- bei die Motorwelle mittels eines Lagersystems 5 gelagert ist. Ferner ist eine Wellendichtung 4 vorgesehen, in die das Lager 5 eingesetzt ist. Sämtliche Bauteile sind ableitfähig oder leitfähig ausgebildet, so dass Aufladungen vom Gebläserad 2 bis zu dem Gehäuse 1 geleitet und über eine Erdung (nicht gezeigt) abgeleitet werden. Die aufwendige Ableitung der Aufladung ist mittels Pfeilen dargestellt. Die Aufladungen am Gebläserad 2 werden auf die Motorwelle 3 geleitet und von dieser durch das Lager 5 über die Wellendichtung 4 zu dem Gehäuse 1 weiterleitet. 1 shows a cross-section of a blower with a housing 1, an impeller 2 arranged therein, which is arranged on a motor shaft 3, where is mounted at the motor shaft by means of a bearing system 5. Further, a shaft seal 4 is provided, in which the bearing 5 is inserted. All components are designed to be conductive or conductive, so that charges are conducted from the impeller 2 to the housing 1 and are discharged via a ground (not shown). The elaborate dissipation of the charge is shown by arrows. The charges on the impeller 2 are directed to the motor shaft 3 and from this passes through the bearing 5 via the shaft seal 4 to the housing 1.
Das erfindungsgemäße Gebläse überwindet die Nachteile des Stands der Technik und ermöglicht durch die isolierende Ausbildung zumindest des Gebläserades eine kostengünstige Lösung einer seit jeher bestehender Anforderungen. The blower according to the invention overcomes the disadvantages of the prior art and, due to the insulating design of at least the blower wheel, enables a cost-effective solution to requirements that have always existed.
* * * * * * * * * *
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP10784484.7A EP2510240B1 (en) | 2009-12-10 | 2010-11-19 | Mixing fan |
| US13/514,450 US20120243979A1 (en) | 2009-12-10 | 2010-11-19 | Mixing fan |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009056837A DE102009056837A1 (en) | 2009-12-10 | 2009-12-10 | mixing fan |
| DE102009056837.9 | 2009-12-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011069805A1 true WO2011069805A1 (en) | 2011-06-16 |
Family
ID=43923586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2010/067794 Ceased WO2011069805A1 (en) | 2009-12-10 | 2010-11-19 | Mixing fan |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20120243979A1 (en) |
| EP (1) | EP2510240B1 (en) |
| DE (1) | DE102009056837A1 (en) |
| WO (1) | WO2011069805A1 (en) |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8839815B2 (en) | 2011-12-15 | 2014-09-23 | Honeywell International Inc. | Gas valve with electronic cycle counter |
| US8899264B2 (en) | 2011-12-15 | 2014-12-02 | Honeywell International Inc. | Gas valve with electronic proof of closure system |
| US8905063B2 (en) | 2011-12-15 | 2014-12-09 | Honeywell International Inc. | Gas valve with fuel rate monitor |
| US8947242B2 (en) | 2011-12-15 | 2015-02-03 | Honeywell International Inc. | Gas valve with valve leakage test |
| US9074770B2 (en) | 2011-12-15 | 2015-07-07 | Honeywell International Inc. | Gas valve with electronic valve proving system |
| US9234661B2 (en) | 2012-09-15 | 2016-01-12 | Honeywell International Inc. | Burner control system |
| US9557059B2 (en) | 2011-12-15 | 2017-01-31 | Honeywell International Inc | Gas valve with communication link |
| US9645584B2 (en) | 2014-09-17 | 2017-05-09 | Honeywell International Inc. | Gas valve with electronic health monitoring |
| US9683674B2 (en) | 2013-10-29 | 2017-06-20 | Honeywell Technologies Sarl | Regulating device |
| US9835265B2 (en) | 2011-12-15 | 2017-12-05 | Honeywell International Inc. | Valve with actuator diagnostics |
| US9841122B2 (en) | 2014-09-09 | 2017-12-12 | Honeywell International Inc. | Gas valve with electronic valve proving system |
| US9846440B2 (en) | 2011-12-15 | 2017-12-19 | Honeywell International Inc. | Valve controller configured to estimate fuel comsumption |
| US9851103B2 (en) | 2011-12-15 | 2017-12-26 | Honeywell International Inc. | Gas valve with overpressure diagnostics |
| US9995486B2 (en) | 2011-12-15 | 2018-06-12 | Honeywell International Inc. | Gas valve with high/low gas pressure detection |
| US10024439B2 (en) | 2013-12-16 | 2018-07-17 | Honeywell International Inc. | Valve over-travel mechanism |
| US10422531B2 (en) | 2012-09-15 | 2019-09-24 | Honeywell International Inc. | System and approach for controlling a combustion chamber |
| US10503181B2 (en) | 2016-01-13 | 2019-12-10 | Honeywell International Inc. | Pressure regulator |
| US10564062B2 (en) | 2016-10-19 | 2020-02-18 | Honeywell International Inc. | Human-machine interface for gas valve |
| US10697815B2 (en) | 2018-06-09 | 2020-06-30 | Honeywell International Inc. | System and methods for mitigating condensation in a sensor module |
| US11073281B2 (en) | 2017-12-29 | 2021-07-27 | Honeywell International Inc. | Closed-loop programming and control of a combustion appliance |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2220059A (en) * | 1985-10-25 | 1989-12-28 | Rinnai Kk | Water heating apparatus |
| EP0499557A1 (en) * | 1991-02-07 | 1992-08-19 | De Dietrich Thermique | Compact cast iron burner of the total premix type |
| JPH1137090A (en) * | 1997-07-16 | 1999-02-09 | Molten Corp | Fan for gas water heater or the like |
| DE10204037A1 (en) | 2002-02-01 | 2003-08-21 | Motoren Ventilatoren Gmbh | Radial fan for moving gas-air mixture for gas therm or gas burner, has shaft with adjustable bearing arranged between impeller and rotor body |
| DE202004012015U1 (en) * | 2004-07-31 | 2005-12-22 | Ebm-Papst Landshut Gmbh | radial impeller |
| DE102004045251A1 (en) | 2004-09-17 | 2006-03-23 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Radial fan housing for delivering explosive gases, has walls made of plastic material e.g. fiber glass reinforced polyamide, and antistatic surface coating that is formed on upper surfaces of walls by metallizing walls |
| US20080131283A1 (en) * | 2006-12-04 | 2008-06-05 | Minebea Co., Ltd. | Fan for a gas burner system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3632789B2 (en) * | 1995-08-28 | 2005-03-23 | 東陶機器株式会社 | Multiblade centrifugal fan design method and multiblade centrifugal fan |
| US5735686A (en) * | 1996-09-11 | 1998-04-07 | American Standard Inc. | Combustion blower shaft leakage relief |
| DE102004036556A1 (en) * | 2003-08-21 | 2005-03-17 | Andreas Stihl Ag & Co. Kg | Blowing device for e.g. phytosanitary product, has equipotentiality conductor connected to motor and extended inside nozzle, and brace with legs provided in form of spider and arranged on end of conductor that is distant from motor |
| DE10350417A1 (en) * | 2003-10-28 | 2005-06-02 | Behr Gmbh & Co. Kg | Method of manufacturing a fan wheel and fan made by this method |
-
2009
- 2009-12-10 DE DE102009056837A patent/DE102009056837A1/en not_active Withdrawn
-
2010
- 2010-11-19 WO PCT/EP2010/067794 patent/WO2011069805A1/en not_active Ceased
- 2010-11-19 US US13/514,450 patent/US20120243979A1/en not_active Abandoned
- 2010-11-19 EP EP10784484.7A patent/EP2510240B1/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2220059A (en) * | 1985-10-25 | 1989-12-28 | Rinnai Kk | Water heating apparatus |
| EP0499557A1 (en) * | 1991-02-07 | 1992-08-19 | De Dietrich Thermique | Compact cast iron burner of the total premix type |
| JPH1137090A (en) * | 1997-07-16 | 1999-02-09 | Molten Corp | Fan for gas water heater or the like |
| DE10204037A1 (en) | 2002-02-01 | 2003-08-21 | Motoren Ventilatoren Gmbh | Radial fan for moving gas-air mixture for gas therm or gas burner, has shaft with adjustable bearing arranged between impeller and rotor body |
| DE202004012015U1 (en) * | 2004-07-31 | 2005-12-22 | Ebm-Papst Landshut Gmbh | radial impeller |
| DE102004045251A1 (en) | 2004-09-17 | 2006-03-23 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Radial fan housing for delivering explosive gases, has walls made of plastic material e.g. fiber glass reinforced polyamide, and antistatic surface coating that is formed on upper surfaces of walls by metallizing walls |
| US20080131283A1 (en) * | 2006-12-04 | 2008-06-05 | Minebea Co., Ltd. | Fan for a gas burner system |
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9846440B2 (en) | 2011-12-15 | 2017-12-19 | Honeywell International Inc. | Valve controller configured to estimate fuel comsumption |
| US8899264B2 (en) | 2011-12-15 | 2014-12-02 | Honeywell International Inc. | Gas valve with electronic proof of closure system |
| US8905063B2 (en) | 2011-12-15 | 2014-12-09 | Honeywell International Inc. | Gas valve with fuel rate monitor |
| US8947242B2 (en) | 2011-12-15 | 2015-02-03 | Honeywell International Inc. | Gas valve with valve leakage test |
| US9074770B2 (en) | 2011-12-15 | 2015-07-07 | Honeywell International Inc. | Gas valve with electronic valve proving system |
| US9851103B2 (en) | 2011-12-15 | 2017-12-26 | Honeywell International Inc. | Gas valve with overpressure diagnostics |
| US9557059B2 (en) | 2011-12-15 | 2017-01-31 | Honeywell International Inc | Gas valve with communication link |
| US8839815B2 (en) | 2011-12-15 | 2014-09-23 | Honeywell International Inc. | Gas valve with electronic cycle counter |
| US10851993B2 (en) | 2011-12-15 | 2020-12-01 | Honeywell International Inc. | Gas valve with overpressure diagnostics |
| US9995486B2 (en) | 2011-12-15 | 2018-06-12 | Honeywell International Inc. | Gas valve with high/low gas pressure detection |
| US9835265B2 (en) | 2011-12-15 | 2017-12-05 | Honeywell International Inc. | Valve with actuator diagnostics |
| US10697632B2 (en) | 2011-12-15 | 2020-06-30 | Honeywell International Inc. | Gas valve with communication link |
| US9234661B2 (en) | 2012-09-15 | 2016-01-12 | Honeywell International Inc. | Burner control system |
| US10422531B2 (en) | 2012-09-15 | 2019-09-24 | Honeywell International Inc. | System and approach for controlling a combustion chamber |
| US11421875B2 (en) | 2012-09-15 | 2022-08-23 | Honeywell International Inc. | Burner control system |
| US9657946B2 (en) | 2012-09-15 | 2017-05-23 | Honeywell International Inc. | Burner control system |
| US10215291B2 (en) | 2013-10-29 | 2019-02-26 | Honeywell International Inc. | Regulating device |
| US9683674B2 (en) | 2013-10-29 | 2017-06-20 | Honeywell Technologies Sarl | Regulating device |
| US10024439B2 (en) | 2013-12-16 | 2018-07-17 | Honeywell International Inc. | Valve over-travel mechanism |
| US9841122B2 (en) | 2014-09-09 | 2017-12-12 | Honeywell International Inc. | Gas valve with electronic valve proving system |
| US9645584B2 (en) | 2014-09-17 | 2017-05-09 | Honeywell International Inc. | Gas valve with electronic health monitoring |
| US10203049B2 (en) | 2014-09-17 | 2019-02-12 | Honeywell International Inc. | Gas valve with electronic health monitoring |
| US10503181B2 (en) | 2016-01-13 | 2019-12-10 | Honeywell International Inc. | Pressure regulator |
| US10564062B2 (en) | 2016-10-19 | 2020-02-18 | Honeywell International Inc. | Human-machine interface for gas valve |
| US11073281B2 (en) | 2017-12-29 | 2021-07-27 | Honeywell International Inc. | Closed-loop programming and control of a combustion appliance |
| US10697815B2 (en) | 2018-06-09 | 2020-06-30 | Honeywell International Inc. | System and methods for mitigating condensation in a sensor module |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102009056837A1 (en) | 2011-06-22 |
| EP2510240B1 (en) | 2016-09-14 |
| US20120243979A1 (en) | 2012-09-27 |
| EP2510240A1 (en) | 2012-10-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2510240B1 (en) | Mixing fan | |
| DE2604636C3 (en) | Device for the electrostatic spraying of coating compounds | |
| WO2000040136A1 (en) | Measuring system for the control of residual dust in safety vacuum cleaners | |
| DE2905223A1 (en) | DEVICE AND METHOD FOR ELECTROSTATIC SPRAY COATING | |
| EP3010646A1 (en) | Method for coating a surface of an electrically non-conductive substrate with powder coatings | |
| WO2009034114A1 (en) | Use of a method for electrostatic painting | |
| WO2000054888A1 (en) | High-speed rotary atomizer with an air guide ring | |
| DE3113526C2 (en) | Method and device for generating high static electricity for applying coating material to objects | |
| DE102017218287A1 (en) | Fuel pump and fuel delivery unit | |
| EP2122153A1 (en) | Pump unit | |
| EP0978319B1 (en) | Powder spray device with external and internal charging | |
| DE102012215557A1 (en) | Overvoltage protection device for an electrical machine | |
| DE102019128292B4 (en) | Cleaning device for electrostatically cleaning gas and uses thereof | |
| EP0175197B1 (en) | Electrode arrangement for a coating apparatus, and its use | |
| DE2726163A1 (en) | DEVICE FOR THE ELECTROSTATIC DEPOSITION OF FLOCKING FIBERS | |
| DE1840336U (en) | DEVICE FOR ELECTROSTATIC COVERING. | |
| DE102021123872A1 (en) | Device for welding or cutting workpieces | |
| DE102004045251A1 (en) | Radial fan housing for delivering explosive gases, has walls made of plastic material e.g. fiber glass reinforced polyamide, and antistatic surface coating that is formed on upper surfaces of walls by metallizing walls | |
| DE102008004226A1 (en) | Photosensitive layer loading mechanism for e.g. high-performance printer, has electrical shield partially surrounding electrode, where shield includes slot-shaped nozzle that supplies air flow directed to electrode | |
| AT209447B (en) | Electrostatic precipitator | |
| DE2343900C3 (en) | Plastic electrostatic precipitator | |
| DE20106871U1 (en) | Cylindrical sensor at an angle to the longitudinal axis | |
| DE102019122531A1 (en) | Externally ignited reciprocating internal combustion engine with a prechamber ignition system | |
| DE102004052992A1 (en) | power tool | |
| DE1490867A1 (en) | Special high voltage cables for electrostatic systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 10784484 Country of ref document: EP Kind code of ref document: A1 |
|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 10784484 Country of ref document: EP Kind code of ref document: A1 |
|
| REEP | Request for entry into the european phase |
Ref document number: 2010784484 Country of ref document: EP |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 2010784484 Country of ref document: EP |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 13514450 Country of ref document: US |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |