EP3115614B1 - Ventilation device with radial air outflow - Google Patents

Ventilation device with radial air outflow Download PDF

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Publication number
EP3115614B1
EP3115614B1 EP16175157.3A EP16175157A EP3115614B1 EP 3115614 B1 EP3115614 B1 EP 3115614B1 EP 16175157 A EP16175157 A EP 16175157A EP 3115614 B1 EP3115614 B1 EP 3115614B1
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EP
European Patent Office
Prior art keywords
cylindrical section
diameter
section
air duct
hub
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.)
Active
Application number
EP16175157.3A
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German (de)
French (fr)
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EP3115614A1 (en
Inventor
Angel Yordanov Stefanov
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Individual
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Individual
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Priority to RS20210692A priority Critical patent/RS61926B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • 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
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/522—Casings; Connections of working fluid for axial pumps 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/545—Ducts
    • F04D29/547—Ducts having a special shape in order to influence fluid flow
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation

Definitions

  • This invention relates to a ventilation device with axial fan and radial air flow, for supplying premises with fresh air.
  • a ventilation device with radial outflow which consists of a straight tube with an accommodated in it axial fan and an end flat baffle in the area of the air outflow, which diverts the air outflow in the radial direction.
  • a turbine driven blower is known from US 2108703 with vertical position comprising a hub with blades mounted in a trough opening of a wall and outer and inner air guiding casings forming a passage for the air.
  • the purpose of invention is to create a ventilation device with an axial fan and radial air flow with an increased air outflow, improved efficiency and lower noise levels.
  • the ventilation device with a radial air flow comprises an air duct and an accommodated in it axial fan, characterized in that the duct comprises a first cylindrical section having an inner diameter D1, a second cylindrical section having an inner diameter D2, wherein in the second cylindrical section is positioned a blade of the axial fan, and a third funnel shaped section, whose diameter gradually increases outwards towards its opening, wherein a coniform baffle is arranged immediately after the hub of the blade in front of the opening of the third section, said coniform baffle constituting a rotation-symmetric body with continuous conical circumferential surface obtained on the basis of a curvilinear, concave generatrix, in whole or in part smooth, with said coniform baffle facing with its small base the hub, said small base has a diameter corresponding to the diameter of the hub. Between the outer circumferential surface of the coniform baffle and the inner circumferential surface of the third section of the air duct a radial air passage is formed. The diameter of the third
  • the circumferential surface of the coniform baffle is formed on the basis of an arc of a circle and is a part of a circular toroid.
  • the inner diameter D2 of the second cylindrical section is larger than the inner diameter D1 of the first cylindrical section, while at the boundary between the first cylindrical section and the second cylindrical section is formed a step on the inner surface of the air duct, and half of the difference between D1 and D2 is equal to the distance b between the blade and the inner surface of the second cylindrical section.
  • a streamlined member is arranged constituting a rotation-symmetric body with conical surface obtained on the basis of a curvilinear convex generatrix, and a base with a diameter corresponding to the diameter of the hub.
  • the above described structure of the ventilation device provides a smooth air flow, avoiding its turbulence. This leads to an increased flow rate of the air outflow and, respectively, to improved efficiency, and lower noise levels.
  • the ventilation device according to the invention is clarified in more detail by means of a preferred embodiment, given by way of non-limiting example of the invention, with reference to the attached figure, which represents a longitudinal section of an embodiment of the ventilation device.
  • the ventilation device shown on Figure 1 is composed of an air duct 1 with circular cross-section and an accommodated inside it axial fan 2.
  • the axial fan 2 is mounted in the air duct 1 in a known in itself manner.
  • the axial fan could be one way fan of reversible fan.
  • Characteristic of the air duct 1 is that it is composed of three consecutive sections.
  • the first section is cylindrical section 1.1 with an inner diameter D1.
  • the next section is second cylindrical section 1.2, with an inner diameter D2, and the blade of the fan 2.1 is arranged inside the second cylindrical section 1.2.
  • the inner diameter D2 of the second cylindrical section 1.2 is larger than the inner diameter D1 of the cylindrical section 1.1, whereby at the boundary between the first cylindrical section 1.1 and the second cylindrical section 1.2 is formed a step on the inner surface of the air duct 1.
  • the deepness of said step which corresponds to the half of the difference between D1 and D2, is equal to the distance (gap) b between the blade and the inner surface of the second cylindrical section 1.2.
  • the purpose of the step is to reduce the return of the air flow towards the inlet of the air duct. It will be clear for the skilled person that D1 and D2 could be also equal without step between the first cylindrical section 1.1 and the second cylindrical section 1.2
  • the distance b between the blade 2.1 and the inner surface of the second cylindrical section 1.2 is minimal and corresponds to the technologically minimum allowable distance, which is the minimum value of the clearance that allows smooth rotation of the blade during operation of the fan.
  • the third section 1.3 has a funnel shape with a diameter that gradually increases towards its opening, wherein the inner circumferential surface of the third section 1.3 transfers from parallel to the axis line of the axial fan 2 into a plane that is perpendicular to said axis line.
  • the small diameter of the third section 1.3 matches the diameter D2 of the second cylindrical section 1.2.
  • a coniform baffle 3 in the shape of an inverted truncated cone with a concave circumferential surface, whose smaller diameter corresponds to the diameter of the hub 2.2.
  • the diameter of the baffle 3 gradually increases in the direction of the air flow till screening of the axial opening of the air duct 1, thus diverting the air outflow, respectively, inflow in the radial direction.
  • the coniform baffle 3 is a solid rotation-symmetric body with conical continuous circumferential surface obtained on the basis of curvilinear concave generatrix, in whole or in parts smooth.
  • the circumferential surface of the coniform baffle 3 is formed on the basis of an arc of a circle and is a part of a circular toroic.
  • a radial air passage is formed between the outer circumferential surface of the coniform baffle 3 and the inner circumferential surface of the third section 1.3 of the air duct 1 .
  • the increase in the diameter of the third section 1.3 outwardly towards the outlet of the air duct is provided in such a way that the width of the radial air passage increases gradually from the area of the hub 2.2 of the fan 2 towards the outlet of the air duct 1.
  • the construction of the radial air passage allows the air flow to exit, respectively, to enter the opening laminar (with no turbulence), noiselessly and with minimal losses.
  • a streamlined member 4 is attached, constituting the rotation-symmetric body with a conical surface, obtained on the basis of curvilinear convex generatrix, and a base with a diameter corresponding to the diameter of the hub 2.2 of the blade 2.1.
  • the streamlined member 4 is turned with its base to the fan 2, while its tip is directed to the opening of the first cylindrical section 1.1.
  • the streamlined member 4 is intended to guide the incoming air flow in the radial direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

    Technical field of the invention
  • This invention relates to a ventilation device with axial fan and radial air flow, for supplying premises with fresh air.
    • Background of the invention
  • A ventilation device with radial outflow is known, which consists of a straight tube with an accommodated in it axial fan and an end flat baffle in the area of the air outflow, which diverts the air outflow in the radial direction.
  • Drawbacks of this fan are the high noise levels, and also major losses from the direct collision of the air with the end baffle, and hence the reduced flow capacity and efficiency of the device.
  • A turbine driven blower is known from US 2108703 with vertical position comprising a hub with blades mounted in a trough opening of a wall and outer and inner air guiding casings forming a passage for the air.
  • Another turbine driven blower is known from US 1762538 comprising vertical converging-diverging casing with an air passage in a diverging portion divided by series of intervening baffle members into several strata.
    • Summary of the invention
  • The purpose of invention is to create a ventilation device with an axial fan and radial air flow with an increased air outflow, improved efficiency and lower noise levels.
  • This task is solved by a ventilation device with an axial fan and radial air flow, whereby the air duct and the end baffle have a special form.
  • According to the invention, the ventilation device with a radial air flow, comprises an air duct and an accommodated in it axial fan, characterized in that the duct comprises a first cylindrical section having an inner diameter D1, a second cylindrical section having an inner diameter D2, wherein in the second cylindrical section is positioned a blade of the axial fan, and a third funnel shaped section, whose diameter gradually increases outwards towards its opening, wherein a coniform baffle is arranged immediately after the hub of the blade in front of the opening of the third section, said coniform baffle constituting a rotation-symmetric body with continuous conical circumferential surface obtained on the basis of a curvilinear, concave generatrix, in whole or in part smooth, with said coniform baffle facing with its small base the hub, said small base has a diameter corresponding to the diameter of the hub. Between the outer circumferential surface of the coniform baffle and the inner circumferential surface of the third section of the air duct a radial air passage is formed. The diameter of the third section gradually increases outwards towards its opening, so that
    • the inner circumferential surface of the third section transfers from parallel to the axis line of the axial fan into a plane that is perpendicular to said axis line of the axial fan, and
    • the width of the radial air passage gradually increases from the area of the hub towards the exit of the air duct.
  • Preferably, the circumferential surface of the coniform baffle is formed on the basis of an arc of a circle and is a part of a circular toroid.
  • In a preferred embodiment of the invention, the inner diameter D2 of the second cylindrical section is larger than the inner diameter D1 of the first cylindrical section, while at the boundary between the first cylindrical section and the second cylindrical section is formed a step on the inner surface of the air duct, and half of the difference between D1 and D2 is equal to the distance b between the blade and the inner surface of the second cylindrical section.
  • Preferably between the maximum width of the blade of the fan and the inner surface of the second cylindrical section of the air duct there is a minimum gap corresponding to the technologically allowable minimum clearance b.
  • Preferably, immediately in front of the hub of the blade, in the direction of opening of the first cylindrical section a streamlined member is arranged constituting a rotation-symmetric body with conical surface obtained on the basis of a curvilinear convex generatrix, and a base with a diameter corresponding to the diameter of the hub.
  • The above described structure of the ventilation device, according to the invention, provides a smooth air flow, avoiding its turbulence. This leads to an increased flow rate of the air outflow and, respectively, to improved efficiency, and lower noise levels.
    • Description of the drawings
  • The ventilation device according to the invention is clarified in more detail by means of a preferred embodiment, given by way of non-limiting example of the invention, with reference to the attached figure, which represents a longitudinal section of an embodiment of the ventilation device.
    • An example of embodiment of the invention
  • The ventilation device shown on Figure 1, according to the invention, is composed of an air duct 1 with circular cross-section and an accommodated inside it axial fan 2. The axial fan 2 is mounted in the air duct 1 in a known in itself manner. The axial fan could be one way fan of reversible fan. Characteristic of the air duct 1 is that it is composed of three consecutive sections.
  • The first section is cylindrical section 1.1 with an inner diameter D1.
  • The next section is second cylindrical section 1.2, with an inner diameter D2, and the blade of the fan 2.1 is arranged inside the second cylindrical section 1.2.
  • In a preferred embodiment, the inner diameter D2 of the second cylindrical section 1.2 is larger than the inner diameter D1 of the cylindrical section 1.1, whereby at the boundary between the first cylindrical section 1.1 and the second cylindrical section 1.2 is formed a step on the inner surface of the air duct 1. The deepness of said step, which corresponds to the half of the difference between D1 and D2, is equal to the distance (gap) b between the blade and the inner surface of the second cylindrical section 1.2. The purpose of the step is to reduce the return of the air flow towards the inlet of the air duct. It will be clear for the skilled person that D1 and D2 could be also equal without step between the first cylindrical section 1.1 and the second cylindrical section 1.2
  • Preferably, the distance b between the blade 2.1 and the inner surface of the second cylindrical section 1.2 is minimal and corresponds to the technologically minimum allowable distance, which is the minimum value of the clearance that allows smooth rotation of the blade during operation of the fan.
  • The third section 1.3 has a funnel shape with a diameter that gradually increases towards its opening, wherein the inner circumferential surface of the third section 1.3 transfers from parallel to the axis line of the axial fan 2 into a plane that is perpendicular to said axis line. The small diameter of the third section 1.3 matches the diameter D2 of the second cylindrical section 1.2.
  • At the third section opening, after and coaxially to the fan 2, is arranged a coniform baffle 3 in the shape of an inverted truncated cone with a concave circumferential surface, whose smaller diameter corresponds to the diameter of the hub 2.2. The diameter of the baffle 3 gradually increases in the direction of the air flow till screening of the axial opening of the air duct 1, thus diverting the air outflow, respectively, inflow in the radial direction.
  • The coniform baffle 3 is a solid rotation-symmetric body with conical continuous circumferential surface obtained on the basis of curvilinear concave generatrix, in whole or in parts smooth. In a preferred embodiment the circumferential surface of the coniform baffle 3 is formed on the basis of an arc of a circle and is a part of a circular toroic.
  • In this arrangement, between the outer circumferential surface of the coniform baffle 3 and the inner circumferential surface of the third section 1.3 of the air duct 1 a radial air passage is formed. Preferably the increase in the diameter of the third section 1.3 outwardly towards the outlet of the air duct is provided in such a way that the width of the radial air passage increases gradually from the area of the hub 2.2 of the fan 2 towards the outlet of the air duct 1.
  • The construction of the radial air passage allows the air flow to exit, respectively, to enter the opening laminar (with no turbulence), noiselessly and with minimal losses.
  • In a preferred embodiment, immediately in front of the hub 2.2 of the blade 2.1, in the direction of the air flow, coaxially with the fan a streamlined member 4 is attached, constituting the rotation-symmetric body with a conical surface, obtained on the basis of curvilinear convex generatrix, and a base with a diameter corresponding to the diameter of the hub 2.2 of the blade 2.1. The streamlined member 4 is turned with its base to the fan 2, while its tip is directed to the opening of the first cylindrical section 1.1. The streamlined member 4 is intended to guide the incoming air flow in the radial direction.
  • Various modifications of the ventilation device will be apparent to those skilled in the art that will remain within the field and scope of the present invention defined in appended claims. All the parts may further be replaced with other technically equivalent elements.
  • Reference signs for technical features are included in the claims for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.

Claims (5)

  1. Ventilation device with a radial air flow, comprising an air duct (1) and an axial fan (2) accommodated inside the air duct (1), wherein the air duct (1) includes a first cylindrical section (1.1) with an inner diameter D1, a second cylindrical section (1.2) with an inner diameter D2, inside which second cylindrical section (1.2) is arranged a blade (2.1) of the axial fan (2), and a third section (1.3) with a funnel shape, whose diameter gradually increases outwards towards its opening, wherein a coniform baffle (3) is arranged immediately after the hub (2.2) of the blade (2.1) in front of the third section opening and coaxially with the fan (2), said coniform baffle (3) constituting a rotation-symmetric body with a continuous conical circumferential surface obtained on the basis of a curvilinear concave generatrix, in whole or in parts smooth, where said coniform baffle (3) is turned with its small base to the hub (2.2), said small base has a diameter corresponding to the diameter of the hub (2.2) of the blade (2.1), wherein between the outer circumferential surface of the coniform baffle (3) and the inner circumferential surface of the third section (1.3) of the air duct (1) a radial air passage is formed, characterized in that the diameter of the third section (1.3) gradually increases outwards towards the exit of the air duct, so that
    - the inner circumferential surface of the third section (1.3) transfers from parallel to the axis line of the axial fan (2) into a plane that is perpendicular to said axis line of the axial fan (2), and
    - the width of the radial air passage gradually increases from the area of the hub (2.2) towards the exit of the air duct (1).
  2. Ventilation device according to claim 1 or 2, characterized in that the circumferential surface of the coniform baffle (3) is formed on the basis of an arc of a circle and is a part of a circular toroid.
  3. Ventilation device according to any one of the preceding claims, characterized in that the inner diameter D2 of the second cylindrical section (1.2) is larger than the inner diameter D1 of the first cylindrical section (1.1), wherein at the boundary between the first cylindrical section (1.1) and the second cylindrical section (1.2) a step on the inner surface of the air duct (1) is formed, wherein half of the difference between D1 and D2 is equal to the distance b between the blade (2.1) of the fan (2) and the inner surface of the second cylindrical section (1.2).
  4. Ventilation device according to any one of the preceding claims, characterized in that between the maximum width of the blade (2.1) of the fan (2) and the inner surface of the second cylindrical section (1.2) of the air duct (1) there is a minimum gap corresponding to the technologically allowable minimum clearance b.
  5. Ventilation device according to any one of the preceding claims, characterized in that immediately in front of the hub (2.2) of the blade (2.1), in the direction of opening of the first cylindrical section (1.1), coaxially with the fan (2) is attached a streamlined member (4) constituting a rotation-symmetric body with conical surface, obtained on the basis of a curvilinear convex generatrix, and with a base with diameter corresponding to the diameter of the hub.
EP16175157.3A 2015-06-29 2016-06-19 Ventilation device with radial air outflow Active EP3115614B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RS20210692A RS61926B1 (en) 2015-06-29 2016-06-19 Ventilation device with radial air outflow

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BG003041U BG2218U1 (en) 2015-06-29 2015-06-29 Ventilation device with radial air outflow

Publications (2)

Publication Number Publication Date
EP3115614A1 EP3115614A1 (en) 2017-01-11
EP3115614B1 true EP3115614B1 (en) 2021-03-17

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ID=56137223

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EP16175157.3A Active EP3115614B1 (en) 2015-06-29 2016-06-19 Ventilation device with radial air outflow

Country Status (3)

Country Link
EP (1) EP3115614B1 (en)
BG (1) BG2218U1 (en)
RS (1) RS61926B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108412816B (en) * 2018-05-10 2021-06-18 奇鋐科技股份有限公司 Noise reduction structure of fan

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1199374A (en) * 1913-01-13 1916-09-26 Green Fuel Economizer Company Conical-flow fan.
US1762358A (en) * 1927-05-20 1930-06-10 Westinghouse Electric & Mfg Co Propeller-type blower
US2108703A (en) * 1935-12-07 1938-02-15 B F Sturtevant Company Inc Blower drive and support
GB454072A (en) * 1936-02-28 1936-09-23 Aerex Ltd Improvements relating to screw fans and screw pumps
JP3621581B2 (en) * 1998-06-03 2005-02-16 株式会社サニックス An omnidirectional blower such as under the floor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
RS61926B1 (en) 2021-06-30
EP3115614A1 (en) 2017-01-11
BG2218U1 (en) 2016-04-28

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