EP1865205A2 - Support device for pressure sensors arranged inside the pressure chambers of centrifugal fans, particularly for ventilation hoods or fume extractors - Google Patents

Support device for pressure sensors arranged inside the pressure chambers of centrifugal fans, particularly for ventilation hoods or fume extractors Download PDF

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Publication number
EP1865205A2
EP1865205A2 EP07109547A EP07109547A EP1865205A2 EP 1865205 A2 EP1865205 A2 EP 1865205A2 EP 07109547 A EP07109547 A EP 07109547A EP 07109547 A EP07109547 A EP 07109547A EP 1865205 A2 EP1865205 A2 EP 1865205A2
Authority
EP
European Patent Office
Prior art keywords
pressure
tube
airfoil
profile
longitudinal development
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.)
Withdrawn
Application number
EP07109547A
Other languages
German (de)
English (en)
French (fr)
Inventor
Antonio Ranalli
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.)
LN 2 - Srl
Original Assignee
LN 2 - Srl
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 LN 2 - Srl filed Critical LN 2 - Srl
Publication of EP1865205A2 publication Critical patent/EP1865205A2/en
Withdrawn legal-status Critical Current

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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
    • F04D29/40—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
    • F04D29/4226—Fan casings
    • 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
    • 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

  • This invention relates to a support device for pressure sensors fitted inside centrifugal fans having the characteristics described in the precharacterising clause of main claim 1.
  • the invention particularly lies within the technical field of centrifugal fans designed for applications in ventilation hoods or fume extraction devices.
  • fans of the above-mentioned type are known to be used as devices for the aspiration of vapours, combustion fumes, exhaust gases, or in all those applications requiring the extraction and conveyance, in general, of gaseous mixtures.
  • Typical embodiments use centrifugal fans with a spiral casing having a cylindrical-drum impeller and axially-extending blades.
  • the casings of these fans also have a side intake opening and a tangential delivery opening between which a spiral pressure chamber extends, the volume of which is defined between the casing and the impeller.
  • one or more pressure pick-ups capable of picking up respective pressure signals inside the fan's pressure chamber are known to be used, these signals typically being used to calculate the fan's air flow or to send an on/off control signal to a boiler or similar appliance associated with the fan.
  • These pressure pick-ups normally have a tubular support passing through a hole in the fan casing, the tubular cavity of which constitutes the pressure signal pick-up tube.
  • the support has a part that protrudes into the pressure chamber having a predetermined length and such as to enable the signal to be picked up in a set position inside the flow generated by the fan. presence of the pressure pick-up, however, causes aerodynamic resistance inside the fan which can have a negative effect on the performance thereof, consequently limiting the ventilation system's overall efficiency.
  • the main object of this invention is to provide a support device for pressure sensors to be positioned inside the pressure chambers of centrifugal fans, which is structurally and operationally designed to overcome the limits referred to with regard to the said known art.
  • 1 shows a centrifugal fan, shown only partially, specially designed for use in ventilation hoods or fume extraction devices.
  • the fan 1 comprises a casing 2 with a spiral external profile, which is defined by two half-casings that can be reciprocally connected to each other, in a removable manner, of which only one, indicated by 2a, is shown in Figure 3, both half-casings being shaped with substantially mirror symmetry in relation to a median connection plane.
  • the casing houses a cylindrical-drum impeller 3 having an axially extending bladed section 4, the impeller being capable of rotating about an axis X.
  • the casing also has a tangential delivery opening 5 and a second intake side opening, coaxial with axis X, made in the half-casing not shown in the Figures.
  • a pressure chamber 7 is defined inside the casing, around the spiral length thereof, its volume being formed between the impeller drum 3 and the internal surface profile 3a of the casing.
  • a support device 10 for a pressure sensor made according to the invention.
  • This device shown in detail in Figures 1 and 2, has a body 11 with a mainly longitudinal development, which is internally affected by a through-tube 12, extending along the said direction of longitudinal development and open at either end 12a, 12b.
  • a first part 13 for obtaining support from the fan casing which has a cylindrical surface conformation with a cross section such as to engage in a respective hole, not shown, made through the thickness of the casing.
  • Connection part 13 is extended at one end into a plate-shaped disc base 14 or having another appropriate shape, from which is erected, in an axial extension of the first part, a second part 15.
  • the said part 15 constitutes the portion of the device that is immersed in the flow generated in the fan's pressure chamber 7 and has a longitudinal dimension of a preselected length such as to enable preset positioning of the open end 12a of the tube 12 inside the flow, so as to pick up in this position the relative pressure signal.
  • This pressure signal can be used to control with an on/off signal (sent to a pressure switch) a boiler or other similar appliance or used to determine, using a transducer, the flow of air generated by the fan.
  • the second part 15 of the body 11 has a section that lies across the direction of longitudinal development having an airfoil-profile conformation 16 with a low drag coefficient, as clearly shown in Figure 1.
  • the airfoil profile 16 is preferably constant along the longitudinal direction of development of part 15 and has respective outside and inside sections 17, 18, extending between corresponding leading 19 and trailing 20 edges of the profile, as is typically the case with a transverse profile of an airfoil surface.
  • the airfoil profile 16 can also be made symmetrical in relation to the plane containing the airfoil chord 21, although other configurations are possible.
  • the airfoil profile 16 may also be chosen from standard profiles, for example chosen from profiles that are well known such as NACA profiles.
  • FIGS. 4 and 5 show a variant of the device according to the invention in which parts similar to those shown in the previous embodiment bear the same reference numerals.
  • This variant differs chiefly due to the fact that at the free end 12a of the tube 12, the plane containing the airfoil profile 16 is inclined in relation to a plane perpendicular to the axis of the tube.
  • this end plane has an inclination such that the trailing edge 20 of the airfoil profile 16 is placed at a shorter distance from the base 14 than the distance of the leading edge 19 from the base 14, however it also possible to arrange an opposite inclination of the plane containing the airfoil profile. Owing to this inclination it is possible to vary the magnitude of the pressure signal detected by the sensor, depending on the degree of inclination, such therefore as to enable greater freedom in the choice and customisation of signals to suit specific applications.
  • the invention thus achieves the proposed objects enabling the advantages described compared to known solutions.
  • these include the fact that the reduced-drag-coefficient profile used to create the pressure pick-up immersed in the air flow generated by the fan advantageously enables the action of interference and disturbance of the flow to be considerably reduced, preserving or improving the performance of the fan and the ventilation system as a whole.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Measuring Fluid Pressure (AREA)
EP07109547A 2006-06-07 2007-06-04 Support device for pressure sensors arranged inside the pressure chambers of centrifugal fans, particularly for ventilation hoods or fume extractors Withdrawn EP1865205A2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000078U ITPD20060078U1 (it) 2006-06-07 2006-06-07 Dispositivo di spporto per sensori di pressione disposti internamente alle camere di pressione di ventilatori centrifughi particolarmente per cappe aspiranti o estrattori di fumi

Publications (1)

Publication Number Publication Date
EP1865205A2 true EP1865205A2 (en) 2007-12-12

Family

ID=38430519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07109547A Withdrawn EP1865205A2 (en) 2006-06-07 2007-06-04 Support device for pressure sensors arranged inside the pressure chambers of centrifugal fans, particularly for ventilation hoods or fume extractors

Country Status (3)

Country Link
EP (1) EP1865205A2 (ru)
IT (1) ITPD20060078U1 (ru)
RU (1) RU2429384C2 (ru)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2107248A2 (de) * 2008-04-03 2009-10-07 ebm-papst Landshut GmbH Verfahren zur Integration eines Druckabnehmers in das Gehäuse eines Gebläses
US20100298993A1 (en) * 2009-05-21 2010-11-25 Lennox Industries, Incorporated Airflow managing system, a method of monitoring the airflow in an hvac system and a hvac system
FR3003350A1 (fr) * 2013-03-15 2014-09-19 Soler Et Palau Res S L Agencement d'une prise de pression dans un ventilateur
WO2016065870A1 (zh) * 2014-10-27 2016-05-06 中山大洋电机制造有限公司 一种风机的测压接口结构
EP3358194A1 (de) * 2016-09-28 2018-08-08 ebm-papst Mulfingen GmbH & Co. KG Ausblaseinheit eines ventilators
WO2018177543A1 (en) * 2017-03-31 2018-10-04 Electrolux Appliances Aktiebolag A cross flow fan
WO2019063395A1 (de) * 2017-09-26 2019-04-04 Ebm-Papst Mulfingen Gmbh & Co. Kg Radialventilator mit differenzdruckmessung
CN112253495A (zh) * 2020-09-11 2021-01-22 宁波方太厨具有限公司 一种风机系统及应用有该风机系统的吸油烟机

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2107248A2 (de) * 2008-04-03 2009-10-07 ebm-papst Landshut GmbH Verfahren zur Integration eines Druckabnehmers in das Gehäuse eines Gebläses
EP2107248A3 (de) * 2008-04-03 2014-06-11 ebm-papst Landshut GmbH Verfahren zur Integration eines Druckabnehmers in das Gehäuse eines Gebläses
US20100298993A1 (en) * 2009-05-21 2010-11-25 Lennox Industries, Incorporated Airflow managing system, a method of monitoring the airflow in an hvac system and a hvac system
US8880224B2 (en) * 2009-05-21 2014-11-04 Lennox Industries Inc. Airflow managing system, a method of monitoring the airflow in an HVAC system and a HVAC system
FR3003350A1 (fr) * 2013-03-15 2014-09-19 Soler Et Palau Res S L Agencement d'une prise de pression dans un ventilateur
WO2016065870A1 (zh) * 2014-10-27 2016-05-06 中山大洋电机制造有限公司 一种风机的测压接口结构
EP3358194A1 (de) * 2016-09-28 2018-08-08 ebm-papst Mulfingen GmbH & Co. KG Ausblaseinheit eines ventilators
WO2018177543A1 (en) * 2017-03-31 2018-10-04 Electrolux Appliances Aktiebolag A cross flow fan
WO2019063395A1 (de) * 2017-09-26 2019-04-04 Ebm-Papst Mulfingen Gmbh & Co. Kg Radialventilator mit differenzdruckmessung
CN112253495A (zh) * 2020-09-11 2021-01-22 宁波方太厨具有限公司 一种风机系统及应用有该风机系统的吸油烟机

Also Published As

Publication number Publication date
RU2007121264A (ru) 2008-12-20
RU2429384C2 (ru) 2011-09-20
ITPD20060078U1 (it) 2007-12-08

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