EP1694967A1 - Fan comprising a laminar flow element that is situated in front of the intake opening - Google Patents

Fan comprising a laminar flow element that is situated in front of the intake opening

Info

Publication number
EP1694967A1
EP1694967A1 EP04787004A EP04787004A EP1694967A1 EP 1694967 A1 EP1694967 A1 EP 1694967A1 EP 04787004 A EP04787004 A EP 04787004A EP 04787004 A EP04787004 A EP 04787004A EP 1694967 A1 EP1694967 A1 EP 1694967A1
Authority
EP
European Patent Office
Prior art keywords
radial fan
fan according
sensor
air inlet
bypass
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
EP04787004A
Other languages
German (de)
French (fr)
Other versions
EP1694967B1 (en
Inventor
Martin Geiger
Rudolf Tungl
Reinhold Hopfensperger
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.)
Ebm Papst Landshut GmbH
Original Assignee
Ebm Papst Landshut 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 Ebm Papst Landshut GmbH filed Critical Ebm Papst Landshut GmbH
Publication of EP1694967A1 publication Critical patent/EP1694967A1/en
Application granted granted Critical
Publication of EP1694967B1 publication Critical patent/EP1694967B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
    • 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
    • F05D2270/00—Control
    • F05D2270/30—Control parameters, e.g. input parameters
    • F05D2270/301—Pressure

Definitions

  • the invention relates to a radial fan with laminar flow element and bypass.
  • the radial fan has a housing and an impeller arranged therein, an air inlet and an air outlet, a pressure space being formed between the air inlet and the air outlet.
  • Radial fans of this type are often used in burners for domestic technology. In the case of such burners, it is particularly necessary, if the system operates according to the electronic compound principle, that the system parameters are recorded as precisely as possible in order to adapt the respective control exactly to the required requirement.
  • Such combustion plants are usually equipped with a pneumatic system, i.e. Valves are controlled pneumatically, the control pressure being provided by the pressure generation of the impeller or being tapped at a corresponding point at the air inlet. This means that a minimum working pressure must always be maintained in order to apply the necessary control forces. This means that a larger power consumption is required for a drive motor than would be necessary to only provide the desired heating output.
  • a pneumatic system i.e. Valves are controlled pneumatically, the control pressure being provided by the pressure generation of the impeller or being tapped at a corresponding point at the air inlet.
  • control commands for the respective valves are not transmitted to the valves as pneumatic impulses, but as electrical impulses.
  • the electrical impulses are controlled by a computer unit on the valves.
  • the respective control signals depend on the power called up, and this in turn can specify a speed for the drive motor.
  • the amount of fuel to be added depends on controlled the air mass, which is detected by a suitable sensor. In the same way, the fuel mass, usually gas, can also be recorded and admixed with respect to the quantity in a computer-controlled manner.
  • the invention is based on the object of specifying a radial fan of the type mentioned, in which the most accurate possible mass quantity measurement for subsequent control according to requirements is achieved in a cost-effective manner.
  • a laminar flow element is arranged in front of the air inlet and has a sensor in a bypass formed therein for detecting at least one parameter of the medium flowing through the air inlet.
  • the arrangement of a laminar flow element in front of the air inlet ensures that the inflow is quasi laminar, regardless of the speed and other device parameters.
  • the special placement of the sensor for detecting a parameter of the medium flowing through the air inlet enables a largely trouble-free detection of the desired parameters.
  • the laminar flow element consists of an arrangement of flow channels which are enclosed by an outer cylinder. It can advantageously be provided that the flow channels are formed in an insert which is inserted in the outer cylinder, the bypass being formed between the two components. In this way, simple processing and manufacture of the component is possible.
  • the bypass has an inlet gap and an outlet gap, which are each formed between the insert and the outer cylinder.
  • the gap formation between two different components makes it possible in a simple manner to set the volume flow through the bypass in relation to the volume flow in the main flow to the desired level.
  • the provision of a gap as an inflow for the bypass ensures that laminar flow is fed to the sensor, so that the most accurate measurement results are achieved.
  • the entry gap is in flow connection with an inflow opening of the tongue element, advantageously one behind the entry gap Calming chamber is provided for calming the air flow, and the sensor is arranged in a sensor channel which is in flow connection with the calming chamber via an inflow and an outflow opening. This fluidic measure achieves a maximum of calming for the medium to be measured, which increases the quality of the measurement result even more.
  • An inflow for a further medium is formed between the laminar flow element and the air inlet of the housing, this inflow advantageously being evenly distributed over the circumference of the air inlet. This measure ensures the best possible mixing of the air with the combustion medium.
  • the further medium is advantageously supplied via a Zelement Oberselement, in which a sensor for tapping predetermined parameters is also provided.
  • This sensor is also advantageously arranged in a bypass which extends between an insert and an outer ring. The rest of the training with the calming chamber and flow connection of the bypass channel is similar to that in connection with the bypass in the laminar flow element.
  • FIG. 1 is a sectional view of a schematic representation of a part of a radial blower with housing, impeller, air inlet and supply element for further media,
  • FIG. 3 shows a representation of the detail II in FIG. 1,
  • FIG. 4 shows a representation of the detail III in FIG. 1,
  • Fig. 6 shows an alternative embodiment in section acc. Fig. 1,
  • Fig. 7 is an illustration of a section along the line A-A in Fig. 6 and
  • FIG. 6 shows an illustration of the detail V in FIG. 6.
  • 1 shows an axial section through the air inlet area of a radial fan 1 according to a first embodiment.
  • the radial fan 1 has a housing 2 with an impeller 3 arranged therein.
  • an air inlet 4 and, shown schematically, an air outlet 5 for the radial delivery of a mixture of media are formed essentially centrally on a side wall of the housing 2.
  • the air inlet 4 is provided with an inlet bend.
  • a laminar flow element 7 is arranged in front of the air inlet 4.
  • the laminar flow element has an arrangement of flow channels 10, which are formed by a multiplicity of passages formed in the laminar flow element 7. These passages can be circular, but can also have any other suitable cross-sectional shape.
  • the flow channels 10 are formed in the illustrated embodiment in an insert 12 which is inserted into an outer cylinder 11.
  • the outer cylinder has a circumferential inner rib 28 on which the insert 12 rests with a shoulder 29.
  • a bypass 8 is formed between the inflow opening 4 ′ of the laminar flow element and the outflow region 29 of the laminar flow element.
  • a sensor 9 is provided, by means of which the desired parameter of the medium flowing through the bypass is tapped as a reference value for the medium passing through the laminar flow element.
  • the bypass has a design which leads to a particular calming of the medium flow, particularly in the area of the sensor.
  • the bypass is formed in the flow direction by an inlet gap 13, a first settling chamber 15 ′, an inflow opening 17, a sensor channel 16, an outflow opening 18, a second settling chamber 15 ′′ and an outlet gap 14. 2 to 5, details I to IV of FIG. 1 are shown enlarged. Detail 1 shows the entrance area of the bypass 8.
  • the outer cylinder 11 has at its upper free end an inward shoulder 11 'running around the entire circumference.
  • the laminar flow element 7 does not adjoin the shoulder 11 'of the outer cylinder 11, but instead forms with its upper end face 7' and the opposite surface 11 "of the shoulder 11 'a circumferential annular gap which subsequently closes the flow path of the calming chamber 15 '.
  • the calming chamber 15' branches off in the upper area of the sensor channel 16 at an inflow opening 17.
  • a calming chamber 15 is in turn formed, which extends over the outflow opening 18 is in flow connection with the sensor channel 16.
  • the calming chamber 15 'in turn is in flow connection via the outlet gap 14 with the air passage in the outflow region 29 of the laminar flow element.
  • the outflow region 29 is narrowed to form a nozzle 30. This nozzle 30 reduces the cross section of the outflow area to the cross section of the air inlet 4.
  • the sensor 9 is arranged at a suitable point in the sensor channel 16.
  • the sensor 9 can be set up to tap different parameters of the flowing medium, for example temperature and flow velocity.
  • the immediate vicinity of the outflow gap 14 to the nozzle 30 in the outflow area ensures, as a result of the pressure difference, that a continuous flow in the bypass is obtained.
  • the senor 9 is arranged on an insert 9 ′ which is inserted into a corresponding recess in the outer cylinder 11.
  • the recess in turn opens towards the sensor channel so that the sensor can come into direct contact with the flowing medium.
  • the nozzle 30 ends at a predetermined distance in front of the air inlet 4 of the housing 3. Between the nozzle 30 and the air inlet 4 there is a circumferential annular gap which is in flow connection with a supply element via an inflow channel 19 20 stands for another medium.
  • the gap formed between the wall of the nozzle 30 and the air inlet 4 is preferably wider on the side facing away from the feed element 20 than on the side facing the feed element.
  • the additional medium in the present case fuel gas, is supplied via a feed element 20.
  • the feed element 20 has a connection 31 for a gas line. This connection is in flow connection with a cylinder ring 32, in which an inner ring 33 is inserted.
  • the feed element 20 is also equipped with a sensor 21 which is arranged in a bypass 22.
  • the bypass design essentially corresponds to the design as described in connection with the laminar flow element 7.
  • the bypass 22 thus essentially consists of an inlet gap 26 which is located in the region of the transition between the connection 31 for the gas line and the inner ring 33.
  • An upper calming chamber 23 ′ adjoins the inlet gap 26, to which an inflow opening 24 for the sensor channel 35 connects in the upper region.
  • the sensor channel 35 In its lower region, the sensor channel 35 is in flow connection with the lower settling chamber 23 "via an outlet 25.
  • the lower settling chamber 23" is in flow connection with the outflow opening 36 via the outlet gap 27.
  • the outflow opening 36 merges into the inflow channel 19, which directs the second medium to the air inlet 4 of the housing in the manner described above.
  • the inflow channel 19 of the further medium does not open into the area of the air inlet 4 or the nozzle area of the air inlet via an annular gap that widens and decreases evenly over the circumference, but rather via a plurality of openings 19 ′.
  • the openings 19 ' are evenly distributed over the circumference, but have a larger passage cross section with increasing distance from the feed element 20. In this way it can also be ensured that a uniform mass flow of the gas is supplied to the pressure chamber over the circumference of the air inlet 4.
  • the invention is not limited to the illustrated and described forms of training.
  • only one sensor is provided in the exemplary embodiment shown, but several sensors can be arranged for more precise detection over the scope of the laminar flow element, the measurement result of which is correspondingly evaluated in a computer and the inflow of gas is regulated accordingly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Measuring Volume Flow (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)

Abstract

The invention relates to a radial fan (1) comprising a housing (2) and an impeller (3), an air inlet (4) and an air outlet (5), a pressure chamber (6) being configured between said inlet and outlet. The invention also comprises a laminar element (7) that is situated in front of the air inlet (4) and that comprises a sensor (9) for detecting at least one parameter of the medium that flows through the air inlet (4), said bypass (8) being formed in said element.

Description

Gebläse mit Lamihar-Flow-Element vor der Ansaugöffnung Blower with lamihar flow element in front of the suction opening
Die Erfindung betrifft ein Radialgebläse mit Laminär-Flow-Element und Bypass. Das Radialgebläse besitzt ein Gehäuse und ein darin angeordnetes Gebläserad, einen Lufteinlaß und einen Luftauslaß, wobei zwischen dem Lufteinlaß und dem Luftauslaß ein Druckraum ausgebildet ist.The invention relates to a radial fan with laminar flow element and bypass. The radial fan has a housing and an impeller arranged therein, an air inlet and an air outlet, a pressure space being formed between the air inlet and the air outlet.
Derartige Radialgebläse werden häufig bei Brennern für die Haustechnik eingesetzt. Bei solchen Brennern ist es insbesondere dann, wenn die Anlage nach dem elektronischen Verbundprinzip arbeitet, erforderlich, dass die Systemparameter möglichst ge- nau erfaßt werden, um die jeweilige Steuerung exakt dem erforderlichen Bedarf anzupassen.Radial fans of this type are often used in burners for domestic technology. In the case of such burners, it is particularly necessary, if the system operates according to the electronic compound principle, that the system parameters are recorded as precisely as possible in order to adapt the respective control exactly to the required requirement.
Üblicherweise werden solche Brennanlagen mit einem pneumatischen Verbund ausgestattet, d.h. Ventile werden pneumatisch gesteuert, wobei der Steuerdruck durch die Druckerzeugung des Gebläserads bereitgestellt wird bzw. an einer entsprechenden Stelle am Lufteinlaß abgegriffen wird. Hierdurch ist es erforderlich, dass stets ein Mindestarbeitsdruck eingehalten werden muß, um die nötigen Steuerkräfte aufzubringen. Dies bedeutet, dass eine größere Leistungsaufnahme für einen Antriebsmotor erforderlich ist, als notwendig wäre, um lediglich die gewünschte Heizleistung zu erbringen.Such combustion plants are usually equipped with a pneumatic system, i.e. Valves are controlled pneumatically, the control pressure being provided by the pressure generation of the impeller or being tapped at a corresponding point at the air inlet. This means that a minimum working pressure must always be maintained in order to apply the necessary control forces. This means that a larger power consumption is required for a drive motor than would be necessary to only provide the desired heating output.
Eine wesentliche Verbesserung wird erzielt, wenn die Steuerung nach dem Prinzip des elektronischen Verbunds geführt wird. Bei dem elektronischen Verbund werden die Steuerbefehle für die jeweiligen Ventile nicht über pneumatische Kräfte, sondern als elektrische Impulse an die Ventile weitergegeben. Die elektrischen Impulse werden von einer Rechnereinheit an die Ventile gesteuert. Die jeweiligen Steuersignale sind abhängig von der abgerufenen Leistung, und diese wiederum kann eine Drehzahl für den Antriebsmotor vorgeben. Die zuzugebende Brennstoffmenge wird in Abhängigkeit von der Luftmasse gesteuert, die über einen geeigneten Sensor erfaßt wird. In gleicher Weise kann auch die Brennstoffmasse, meist Gas, erfaßt und hinsichtlich der Menge rechnergesteuert beigemischt werden.A significant improvement is achieved if the control is carried out according to the principle of electronic interconnection. In the electronic network, the control commands for the respective valves are not transmitted to the valves as pneumatic impulses, but as electrical impulses. The electrical impulses are controlled by a computer unit on the valves. The respective control signals depend on the power called up, and this in turn can specify a speed for the drive motor. The amount of fuel to be added depends on controlled the air mass, which is detected by a suitable sensor. In the same way, the fuel mass, usually gas, can also be recorded and admixed with respect to the quantity in a computer-controlled manner.
Ein Problem besteht jedoch in der Plazierung der Sensoren für die Luftmassen- bzw. Gasmengenmessung.However, there is a problem with the placement of the sensors for measuring the air mass or gas quantity.
Der Erfindung liegt die Aufgabe zugrunde, ein Radialgebläse der genannten Gattung anzugeben, bei welcher in kostengünstiger weise eine möglichst exakte Massenmen- genmessung für eine nachfolgende bedarfsgerechte Steuerung erzielt wird.The invention is based on the object of specifying a radial fan of the type mentioned, in which the most accurate possible mass quantity measurement for subsequent control according to requirements is achieved in a cost-effective manner.
Die Aufgabe wird erfindungsgemäß dadurch gelöst, dass vor dem Lufteinlaß ein La- minar-Flow-Element angeordet ist, das in einem darin ausgeformten Bypass einen Sensor zur Erfassung mindestens eines Parameters des durch den Lufteinlaß strömenden Mediums aufweist. Durch die Anordnung eines Laminar-Flow-Elements vor dem Lufteinlaß ist gewährleistet, dass die Anströmung quasi laminar erfolgt, unabhängig von der Drehzahl und anderen Geräteparametern. Die besondere Plazierung des Sensors zur Erfassung eines Parameters des durch den Lufteinlaß strömenden Mediums ermöglicht eine weitgehend störungsfreie Erfassung der gewünschten Parameter.The object is achieved according to the invention in that a laminar flow element is arranged in front of the air inlet and has a sensor in a bypass formed therein for detecting at least one parameter of the medium flowing through the air inlet. The arrangement of a laminar flow element in front of the air inlet ensures that the inflow is quasi laminar, regardless of the speed and other device parameters. The special placement of the sensor for detecting a parameter of the medium flowing through the air inlet enables a largely trouble-free detection of the desired parameters.
Bei einer vorteilhaften Ausgestaltung kann vorgesehen sein, dass das Laminar-Flow- Element aus einer Anordnung von Strömungskanälen besteht, die von einem Außenzylinder umschlossen sind. Dabei kann vorteilhafterweise vorgesehen sein, dass die Strömungskanäle in einem Einsatz ausgebildet sind, der in dem Außenzylinder eingesetzt ist, wobei der Bypass zwischen den beiden Bauteilen ausgebildet ist. Auf diese Weise ist eine einfache Bearbeitung und Herstellung des Bauteils möglich.In an advantageous embodiment it can be provided that the laminar flow element consists of an arrangement of flow channels which are enclosed by an outer cylinder. It can advantageously be provided that the flow channels are formed in an insert which is inserted in the outer cylinder, the bypass being formed between the two components. In this way, simple processing and manufacture of the component is possible.
Eine besonders vorteilhafte Ausgestaltung kann darin gesehen werden, dass der Bypass einen Eintrittsspalt und einen Austrittsspalt aufweist, die jeweils zwischen dem Einsatz und dem Außenzylinder ausgebildet sind. Durch die Spaltbildung zwischen zwei unterschiedlichen Bauelementen ist es auf einfache Weise möglich, den Volumenstrom durch den Bypass im Verhältnis zum Volumenstrom in der Hauptströmung auf das gewünschte Maß einzustellen. Durch die Bereitststellung eines Spalts als Zufluß für den Bypass wird dafür Sorge getragen, dass dem Sensor laminare Strömung zugeführt wird, so dass genaueste Meßergebnisse erzielt werden. Insbesondere kann vorgesehen sein, dass der Eintrittsspalt in Strömungsverbindung mit einer Einströmöffnung des Zungenelements steht, wobei vorteilhafterweise hinter dem Eintrittsspalt eine Beruhigungskammer zur Beruhigung der Luftströmung vorgesehen ist, und der Sensor in einer Sensorkanal angeordnet ist, der über eine Zu- und eine Abströmöffnung mit der Beruhigungskammer in Strömungsverbindung steht. Durch diese strömungstechnische Maßnahme wird ein Höchstmaß an Beruhigung für das zu messende Medium erreicht, wodurch die Qualität des Meßergebnisses noch mehr gesteigert ist.A particularly advantageous embodiment can be seen in the fact that the bypass has an inlet gap and an outlet gap, which are each formed between the insert and the outer cylinder. The gap formation between two different components makes it possible in a simple manner to set the volume flow through the bypass in relation to the volume flow in the main flow to the desired level. The provision of a gap as an inflow for the bypass ensures that laminar flow is fed to the sensor, so that the most accurate measurement results are achieved. In particular, it can be provided that the entry gap is in flow connection with an inflow opening of the tongue element, advantageously one behind the entry gap Calming chamber is provided for calming the air flow, and the sensor is arranged in a sensor channel which is in flow connection with the calming chamber via an inflow and an outflow opening. This fluidic measure achieves a maximum of calming for the medium to be measured, which increases the quality of the measurement result even more.
Zwischen dem Laminar-Flow-Element und dem Lufteinlaß des Gehäuses ist ein Zustrom für ein weiteres Medium ausgebildet, wobei dieser Zustrom vorteilhafterweise über den Umfang des Lufteinlasses gleichmäßig verteilt ist. Durch diese Maßnahme wird eine bestmögliche Vermischung der Luft mit dem Brennmedium erzielt.An inflow for a further medium is formed between the laminar flow element and the air inlet of the housing, this inflow advantageously being evenly distributed over the circumference of the air inlet. This measure ensures the best possible mixing of the air with the combustion medium.
Das weitere Medium wird vorteilhafterweise über ein Zύleitungselement zugeführt, in welchem ebenfalls ein Sensor zum Abgreifen vorbestimmter Parameter vorgesehen ist. Auch dieser Sensor ist vorteilhafterweise in einem Bypass angeordnet, der sich zwischen einem Einsatz und einem Außenring erstreckt. Die übrige Ausbildung mit Beruhigungskammer und Strömungsverbindung des Bypasskanals ist ähnlich ausgebildet wie in Verbindung mit dem Bypass im Laminar-Flow-Element.The further medium is advantageously supplied via a Zelementleitungselement, in which a sensor for tapping predetermined parameters is also provided. This sensor is also advantageously arranged in a bypass which extends between an insert and an outer ring. The rest of the training with the calming chamber and flow connection of the bypass channel is similar to that in connection with the bypass in the laminar flow element.
Im folgenden wird die Erfindung anhand in der Zeichnung dargestellter Ausführungsbeispiele näher erläutert.The invention is explained in more detail below with reference to exemplary embodiments shown in the drawing.
Es zeigen:Show it:
Fig. 1 eine Schnittansicht einer schematischen Darstellung eines Teils eines Radial- gebläses mit Gehäuse, Gebläserad, Lufteinlaß und Zuleitungslement für weitere Medien,1 is a sectional view of a schematic representation of a part of a radial blower with housing, impeller, air inlet and supply element for further media,
Fig. 2 eine Darstellung des Details I in Fig. 1,2 shows an illustration of the detail I in FIG. 1,
Fig. 3 eine Darstellung des Details II in Fig. 1,3 shows a representation of the detail II in FIG. 1,
Fig. 4 eine Darstellung des Details III in Fig. 1,4 shows a representation of the detail III in FIG. 1,
Fig. 5 eine Darstellung des Details IV in Fig. 1 ,5 shows an illustration of the detail IV in FIG. 1,
Fig. 6 eine alternative Ausführungsform im Schnitt gem. Fig. 1,Fig. 6 shows an alternative embodiment in section acc. Fig. 1,
Fig. 7 eine Darstellung eines Schnitts entlang der Linie A-A in Fig. 6 undFig. 7 is an illustration of a section along the line A-A in Fig. 6 and
Fig. 8 eine Darstellung des Details V in Fig. 6. Fig. 1 zeigt einen Axialschnitt durch den Lufteinlaßbereich eines Radialgebläses 1 gemäß einer ersten Ausführungsform. Das Radialgebläse 1 weist ein Gehäuse 2 mit einem darin angeordneten Gebläserad 3 auf. In der schematischen Darstellung ist im wesentlichen zentral an einer Seitenwand des Gehäuses 2 ein Lufteinlaß 4 und, sehe- matisch dargestellt, ein Luftauslaß 5 zur radialen Abgabe eines Mediumgemischs ausgebildet.8 shows an illustration of the detail V in FIG. 6. 1 shows an axial section through the air inlet area of a radial fan 1 according to a first embodiment. The radial fan 1 has a housing 2 with an impeller 3 arranged therein. In the schematic illustration, an air inlet 4 and, shown schematically, an air outlet 5 for the radial delivery of a mixture of media are formed essentially centrally on a side wall of the housing 2.
Zwischen dem Lufteinlaß 4 und dem Luftauslaß 5 erstreckt sich ein Druckraum 6, in welchem das Gebläserad 3 den Druck und die Geschwindigkeit des durchströmenden Mediums erhöht.Between the air inlet 4 and the air outlet 5 extends a pressure chamber 6, in which the impeller 3 increases the pressure and the speed of the medium flowing through.
In üblicher Weise ist der Lufteinlaß 4 mit einer Einlaufkrümmung versehen. Vor dem Lufteinlaß 4 ist ein Laminar-Flow-Element 7 angeordnet. Das Laminar-Flow-Element weist eine Anordnung von Strömungskanälen 10 auf, die durch eine Vielzahl von in dem Laminar-Flow-Element 7 ausgeformten Durchgängen gebildet werden. Diese Durchgänge können kreisrund sein, aber auch jede andere geeignete Querschnittsform aufweisen.In the usual way, the air inlet 4 is provided with an inlet bend. A laminar flow element 7 is arranged in front of the air inlet 4. The laminar flow element has an arrangement of flow channels 10, which are formed by a multiplicity of passages formed in the laminar flow element 7. These passages can be circular, but can also have any other suitable cross-sectional shape.
Die Strömungskanäle 10 sind im dargestellten Ausführungsbeispiel in einem Einsatz 12 ausgebildet, der in einen Außenzylinder 11 eingesetzt ist. Hierzu weist der Außenzylinder eine umlaufende innere Rippe 28 auf, an der der Einsatz 12 mit einer Schulter 29 aufliegt.The flow channels 10 are formed in the illustrated embodiment in an insert 12 which is inserted into an outer cylinder 11. For this purpose, the outer cylinder has a circumferential inner rib 28 on which the insert 12 rests with a shoulder 29.
Zwischen der Einströmöffnung 4' des Laminar-Flow-EIements und dem Ausströmbereich 29 des Laminar-Flow-EIements ist ein Bypass 8 ausgebildet. Im Weg dieses Bypass 8 ist ein Sensor 9 vorgesehen, mittels welchem der gewünsche Parameter des durch den Bypass strömenden Mediums als Referenzwert für durch das Laminar-Flow- Element durchtretendes Medium abgegriffen wird.A bypass 8 is formed between the inflow opening 4 ′ of the laminar flow element and the outflow region 29 of the laminar flow element. In the path of this bypass 8, a sensor 9 is provided, by means of which the desired parameter of the medium flowing through the bypass is tapped as a reference value for the medium passing through the laminar flow element.
Der Bypass weist erfindungsgemäß eine Gestaltung auf, die zu einer besonderen Beruhigung des Medium-Stromes insbesondere im Bereich des Sensors führt.According to the invention, the bypass has a design which leads to a particular calming of the medium flow, particularly in the area of the sensor.
In dem dargestellten Ausführungsbeispiel wird der Bypass in Strömungsrichtung von einem Eintrittsspalt 13, einer ersten Beruhigungskammer 15', einer Zuströmöffnung 17, einem Sensorkanal 16, einer Abströmöffnung 18, einer zweiten Beruhigungskammer 15" und einem Austrittsspalt 14 gebildet. In den Fig. 2 bis 5 sind Details I bis IV der Fig. 1 vergrößert wiedergegeben. Detail l zeigt den Eingangsbereich des Bypass 8. Der Außenzylinder 11 weist an seinem oberen freien Ende eine nach innen gerichtete, über den gesamten Umfang umlaufende Schulter 11' auf. Das Laminar-Flow-Element 7 schließt nicht auf Anschlag an der Schulter 11' des Außenzylinders 11 an, sondern bildet mit seiner oberen Stirnfläche 7' und der gegenüberliegenden Fläche 11" der Schulter 11' einen umlaufenden Ringspalt, der in weiterer Folge des Strömungswegs zu der Beruhigungskammer 15' erweitert ist. Im dargestellten Ausführungsbeispiel zweigt von der Beruhigungskammer 15' in deren oberen Bereich der Sensorkanal 16 an einer Zuströmöffnung 17 ab. Im unteren Be- reich des Sensorkanals 16 ist wiederum eine Beruhigungskammer 15" ausgebildet, die über die Abströmöffnung 18 mit dem Sensorkanal 16 in Strömungsverbindung steht. Die Beruhigungskammer 15' wiederum steht über den Austrittsspalt 14 mit dem Luftdurchgang im Ausströmbereich 29 des Laminar-Flow-EIements in Strömungsverbindung. In unmittelbarem Anschluß an den Austrittsspalt 14 ist der Ausströmbereich 29 zu einer Düse 30 verengt. Diese Düse 30 reduziert den Querschnitt des Ausströmbereichs auf den Querschnitt des Lufteinlasses 4.In the exemplary embodiment shown, the bypass is formed in the flow direction by an inlet gap 13, a first settling chamber 15 ′, an inflow opening 17, a sensor channel 16, an outflow opening 18, a second settling chamber 15 ″ and an outlet gap 14. 2 to 5, details I to IV of FIG. 1 are shown enlarged. Detail 1 shows the entrance area of the bypass 8. The outer cylinder 11 has at its upper free end an inward shoulder 11 'running around the entire circumference. The laminar flow element 7 does not adjoin the shoulder 11 'of the outer cylinder 11, but instead forms with its upper end face 7' and the opposite surface 11 "of the shoulder 11 'a circumferential annular gap which subsequently closes the flow path of the calming chamber 15 '. In the exemplary embodiment shown, the calming chamber 15' branches off in the upper area of the sensor channel 16 at an inflow opening 17. In the lower area of the sensor channel 16 a calming chamber 15 "is in turn formed, which extends over the outflow opening 18 is in flow connection with the sensor channel 16. The calming chamber 15 'in turn is in flow connection via the outlet gap 14 with the air passage in the outflow region 29 of the laminar flow element. In direct connection to the outlet gap 14, the outflow region 29 is narrowed to form a nozzle 30. This nozzle 30 reduces the cross section of the outflow area to the cross section of the air inlet 4.
An geeigneter Stelle ist in dem Sensorkanal 16 der Sensor 9 angeordnet. Der Sensor 9 kann eingerichtet sein, unterschiedliche Parameter des vorbeiströmenden Mediums abzugreifen, so zum Beispiel Temperatur und Strömungsgeschwindigkeit.The sensor 9 is arranged at a suitable point in the sensor channel 16. The sensor 9 can be set up to tap different parameters of the flowing medium, for example temperature and flow velocity.
Durch die unmittelbare Nachbarschaft des Ausströmspalts 14 zu der Düse 30 im Ausströmbereich wird in Folge des Druckunterschieds sichergestellt, dass eine kontinuierliche Strömung im Bypass erhalten wird.The immediate vicinity of the outflow gap 14 to the nozzle 30 in the outflow area ensures, as a result of the pressure difference, that a continuous flow in the bypass is obtained.
Wie in Fig. 3 zu erkennen ist, ist der Sensor 9 an einem Einsatz 9' angeordnet, der in eine entsprechende Ausnehmung in dem Außenzylinder 11 eingesetzt ist. Die Aus- nehmung ihrerseits öffnet sich zum Sensorkanal hin, so dass der Sensor in unmittelbaren Berührkontakt mit dem strömenden Medium treten kann.As can be seen in FIG. 3, the sensor 9 is arranged on an insert 9 ′ which is inserted into a corresponding recess in the outer cylinder 11. The recess in turn opens towards the sensor channel so that the sensor can come into direct contact with the flowing medium.
Wie weiter aus Fig. 1 zu erkennen ist, endet die Düse 30 in einem vorbestimmten Abstand vor dem Lufteinlaß 4 des Gehäuses 3. Zwischen der Düse 30 und dem Lufteinlaß 4 ist ein umlaufender Ringspalt vorgesehen, der über einen Zuströmkanal 19 in Strömungsverbindung mit einem Zuleitungselement 20 für ein weiteres Medium steht. Der zwischen der Wand der Düse 30 und dem Lufteinlaß 4 gebildete Spalt ist vorzugsweise auf der dem Zuleitungselement 20 abgewandten Seite breiter als auf der dem Zuleitungselement zugewandten Seite. Durch eine derartige Gestaltung wird si- chergesellt, dass über den Umfang des Lufteinlasses 4 das zusätzliche Medium gleichmäßig verteilt dem ersten Medium zugeführt wird.1, the nozzle 30 ends at a predetermined distance in front of the air inlet 4 of the housing 3. Between the nozzle 30 and the air inlet 4 there is a circumferential annular gap which is in flow connection with a supply element via an inflow channel 19 20 stands for another medium. The gap formed between the wall of the nozzle 30 and the air inlet 4 is preferably wider on the side facing away from the feed element 20 than on the side facing the feed element. Such a design ensures that ensured that the additional medium is fed to the first medium in an evenly distributed manner over the circumference of the air inlet 4.
Das zusätzliche Medium, im vorliegenden Fall Brenngas, wird über ein Zuleitungselement 20 zugeführt. Das Zuleitungselement 20 weist einen Anschluß 31 für eine Gas- leitung auf. Dieser Anschluß steht in Strömungsverbindung mit einem Zylinderring 32, in welchem ein Innenring 33 eingesetzt ist. Das Zuleitungselement 20 ist ebenfalls mit einem Sensor 21 ausgerüstet, der in einem Bypass 22 angeordnet ist. Die Bypassge- staltung entspricht im wesentlichen der Ausbildung, wie sie in Zusammenhang mit dem Laminar-Flow-Element 7 beschrieben worden ist. Der Bypass 22 besteht somit im we- sentlichen aus einem Eintrittsspalt 26, der sich im Bereich des Übergangs zwischen dem Anschluß 31 für die Gasleitung und dem Innenring 33 befindet. An den Eintrittsspalt 26 schließt sich eine obere Beruhigungskammer 23' an, an die im oberen Bereich eine Zuflußöffnung 24 für den Sensorkanal 35 anschließt. Der Sensorkanal 35 steht in seinem unteren Bereich über einen Abfluß 25 mit der unteren Beruhigungskammer 23" in Strömungsverbindung. Die untere Beruhigungskammer 23" steht über den Austrittsspalt 27 mit der Abströmöffnung 36 in Strömungsverbindung. Die Abströmöffnung 36 geht über in den Zuströmkanal 19, der das zweite Medium in der weiter oben beschriebenen Weise zu dem Lufteinlaß 4 des Gehäuses leitet.The additional medium, in the present case fuel gas, is supplied via a feed element 20. The feed element 20 has a connection 31 for a gas line. This connection is in flow connection with a cylinder ring 32, in which an inner ring 33 is inserted. The feed element 20 is also equipped with a sensor 21 which is arranged in a bypass 22. The bypass design essentially corresponds to the design as described in connection with the laminar flow element 7. The bypass 22 thus essentially consists of an inlet gap 26 which is located in the region of the transition between the connection 31 for the gas line and the inner ring 33. An upper calming chamber 23 ′ adjoins the inlet gap 26, to which an inflow opening 24 for the sensor channel 35 connects in the upper region. In its lower region, the sensor channel 35 is in flow connection with the lower settling chamber 23 "via an outlet 25. The lower settling chamber 23" is in flow connection with the outflow opening 36 via the outlet gap 27. The outflow opening 36 merges into the inflow channel 19, which directs the second medium to the air inlet 4 of the housing in the manner described above.
In Fig. 6 ist eine weitere Ausführungsform des erfindungsgemäßen Laminar-Flow- Elements dargestellt. Bei dieser Ausführungsvariante mündet der Zuströmkanal 19 des weiteren Mediums nicht über einen sich gleichmäßig über den Umfang verbreiternden und wieder abnehmenden Ringspalt, sondern über eine Vielzahl von Öffnungen 19' in den Bereich des Lufteinlasses 4 bzw. den Düsenbereich des Lufteinlasses ein. Die Öffnungen 19' sind gleichmäßig über den Umfang verteilt, haben jedoch mit zuneh- menden Abstand vom Zuleitungselement 20 einen größeren Durchtrittsquerschnitt. Auf diese Weise kann ebenfalls sichergestellt werden, dass ein gleichmäßiger Massenstrom des Gases über den Umfang des Lufteinlasses 4 dem Druckraum zugeführt wird.6 shows a further embodiment of the laminar flow element according to the invention. In this embodiment variant, the inflow channel 19 of the further medium does not open into the area of the air inlet 4 or the nozzle area of the air inlet via an annular gap that widens and decreases evenly over the circumference, but rather via a plurality of openings 19 ′. The openings 19 'are evenly distributed over the circumference, but have a larger passage cross section with increasing distance from the feed element 20. In this way it can also be ensured that a uniform mass flow of the gas is supplied to the pressure chamber over the circumference of the air inlet 4.
Die Erfindung ist nicht auf die dargestellten und beschriebenen Ausbildungsformen beschränkt. So ist beispielsweise in dem dargestellten Ausführungsbeispiel lediglich ein Sensor vorgesehen, es können jedoch zur genaueren Erfassung über den Umfang des Laminar-Flow-EIements verteilt mehrere Sensoren angeordnet sein, deren Meßergebnis in einem Rechner entsprechend ausgewertet und der Zustrom an Gas entsprechend eingeregelt wird. The invention is not limited to the illustrated and described forms of training. For example, only one sensor is provided in the exemplary embodiment shown, but several sensors can be arranged for more precise detection over the scope of the laminar flow element, the measurement result of which is correspondingly evaluated in a computer and the inflow of gas is regulated accordingly.

Claims

Patentansprüche claims
1. Radialgebläse (1) mit einem Gehäuse (2) und einem darin angeordneten Gebläserad (3), einem Lufteinlass (4) und einem Luftauslaß (5), wobei zwischen letzteren ein Druckraum (6) ausgebildet ist, dadurch gekennzeichnet, dass vor dem Lufteinlass (4) ein Laminarelement (7) angeordnet ist, das in einem darin ausgeformten Bypass (8) einen Sensor (9) zur Erfassung mindestens eines Parameter des durch den Lufteinlass (4) strömenden Mediums umfasst.1. Radial fan (1) with a housing (2) and a fan wheel (3) arranged therein, an air inlet (4) and an air outlet (5), a pressure chamber (6) being formed between the latter, characterized in that before Air inlet (4) a laminar element (7) is arranged, which in a bypass (8) formed therein comprises a sensor (9) for detecting at least one parameter of the medium flowing through the air inlet (4).
2. Radialgebläse nach Anspruch 1 , dadurch gekennzeichnet, dass das Lamina- relement (7) aus einer Anordnung von Strömungskanälen (10) besteht, die von einem2. Radial fan according to claim 1, characterized in that the lamina- element (7) consists of an arrangement of flow channels (10) by one
Außenzylinder (11) umschlossen sind.Outer cylinder (11) are enclosed.
3. Radialgebläse nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Strömungskanäle (10) in einem Einsatz (12) ausgebildet sind, der in den Außenzylinder (11) eingesetzt ist, wobei der Bypass (8) zwischen beiden Bauteilen ausgebildet ist.3. Radial fan according to claim 1 or 2, characterized in that the flow channels (10) are formed in an insert (12) which is inserted into the outer cylinder (11), the bypass (8) being formed between the two components.
4. Radialgebläse nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Bypass (8) einen Eintrittsspalt (13) und einen Austrittsspalt (14) aufweist, die jeweils zwischen dem Einsatz (12) und dem Außenzylinder (11) ausgebildet sind.4. Radial fan according to one of claims 1 to 3, characterized in that the bypass (8) has an inlet gap (13) and an outlet gap (14), which are each formed between the insert (12) and the outer cylinder (11).
5. Radialgebläse nach Anspruch 4, dadurch gekennzeichnet, dass der Eintrittsspalt (13) und der Austrittsspalt (14) in Strömungsverbindung mit der Einströmöffnung (4') des Laminarelements (7) bzw. dessen Ausström bereich (29) stehen.5. Radial fan according to claim 4, characterized in that the inlet gap (13) and the outlet gap (14) are in flow connection with the inflow opening (4 ') of the laminar element (7) or the outflow region (29).
6. Radialgebläse nach einem der Ansprüche 4 bis 3, dadurch gekennzeichnet, dass der Bypass (8) hinter dem Eintrittsspalt (13) einen Beruhigungskammer (15') zur Beruhigung der Luftströmung aufweist.6. Radial fan according to one of claims 4 to 3, characterized in that the bypass (8) behind the inlet gap (13) has a calming chamber (15 ') for calming the air flow.
7. Radialgebläse nach einem der Ansprüche 5 bis 6, dadurch gekennzeichnet, dass der Sensor (9) in/an einem Sensorkanal (16) angeordnet ist, der über eine Zu- und eine Abströmöffnung (17; 18) in Strömungsverbindung mit jeweils einem Beruhigungskammer (15', 15") steht. 7. Radial fan according to one of claims 5 to 6, characterized in that the sensor (9) in / on a sensor channel (16) is arranged, which via an inlet and an outlet opening (17; 18) in flow communication with a calming chamber (15 ', 15 ") stands.
8. Radialgebläse nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass zwischen dem Laminarelement (7) und dem Lufteinlass (4) des Gehäuse (2) ein Zustromkanal (19) für ein weiteres Medium ausgebildet ist.8. Radial fan according to one of claims 1 to 7, characterized in that between the laminar element (7) and the air inlet (4) of the housing (2), an inflow channel (19) is formed for a further medium.
9. Radialgebläse nach Anspruch 8, dadurch gekennzeichnet, dass das weitere Medium über den Umfang des Lufteinlasses (4) gleichmäßig verteilt zuströmt.9. Radial fan according to claim 8, characterized in that the further medium flows over the circumference of the air inlet (4) evenly distributed.
10. Radialgebläse nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass das weitere Medium über ein Zuleitungselement (20) zugeführt wird.10. Radial fan according to one of claims 1 to 9, characterized in that the further medium is fed via a feed element (20).
11. Radialgebläse nach Anspruch 10, dadurch gekennzeichnet, dass Zuleitungselement (20) einen Sensor (21) für das weitere Medium aufweist.11. Radial fan according to claim 10, characterized in that the feed element (20) has a sensor (21) for the further medium.
12. Radialgebläse nach Anspruch 11 , dadurch gekennzeichnet, dass der Sensor (21) in einem Bypass (22) angeordnet ist, der einen Beruhigungskammer (23) aufweist.12. Radial fan according to claim 11, characterized in that the sensor (21) is arranged in a bypass (22) which has a calming chamber (23).
13. Radialgebläse nach Anspruch 12, dadurch gekennzeichnet, dass der Sensor (21) in einem Sensorkanal (35) angeordnet ist, der mit dem Beruhigungskammer (23) über einen Zu- und einen Abfluss (24, 25) in Strömungsverbindung steht. 13. Radial fan according to claim 12, characterized in that the sensor (21) is arranged in a sensor channel (35) which is in flow connection with the calming chamber (23) via an inflow and an outflow (24, 25).
EP04787004A 2003-10-23 2004-09-24 Fan comprising a laminar flow element in front of the intake opening Not-in-force EP1694967B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10349344A DE10349344B3 (en) 2003-10-23 2003-10-23 Blower with laminar element in front of the suction opening
PCT/EP2004/010728 WO2005050025A1 (en) 2003-10-23 2004-09-24 Fan comprising a laminar flow element that is situated in front of the intake opening

Publications (2)

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EP1694967A1 true EP1694967A1 (en) 2006-08-30
EP1694967B1 EP1694967B1 (en) 2007-11-14

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EP (1) EP1694967B1 (en)
JP (1) JP4588712B2 (en)
KR (1) KR101128959B1 (en)
AT (1) ATE378516T1 (en)
CA (1) CA2542466C (en)
DE (2) DE10349344B3 (en)
ES (1) ES2295934T3 (en)
PT (1) PT1694967E (en)
WO (1) WO2005050025A1 (en)

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KR20060108684A (en) 2006-10-18
JP4588712B2 (en) 2010-12-01
JP2007509273A (en) 2007-04-12
DE502004005535D1 (en) 2007-12-27
WO2005050025A1 (en) 2005-06-02
CA2542466A1 (en) 2005-06-02
US20070066209A1 (en) 2007-03-22
PT1694967E (en) 2008-02-11
US7670104B2 (en) 2010-03-02
EP1694967B1 (en) 2007-11-14
ATE378516T1 (en) 2007-11-15
KR101128959B1 (en) 2012-03-27
DE10349344B3 (en) 2005-06-30
CA2542466C (en) 2012-01-03
ES2295934T3 (en) 2008-04-16

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