EP4290082A1 - Ventilatorflügel und verfahren zum herstellen desselben - Google Patents

Ventilatorflügel und verfahren zum herstellen desselben Download PDF

Info

Publication number
EP4290082A1
EP4290082A1 EP22178399.6A EP22178399A EP4290082A1 EP 4290082 A1 EP4290082 A1 EP 4290082A1 EP 22178399 A EP22178399 A EP 22178399A EP 4290082 A1 EP4290082 A1 EP 4290082A1
Authority
EP
European Patent Office
Prior art keywords
fan blade
round bar
round
edge
base body
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.)
Pending
Application number
EP22178399.6A
Other languages
English (en)
French (fr)
Inventor
David BRAHA
David POPEK
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.)
Castolin Eutectic GmbH
Original Assignee
Castolin Eutectic 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 Castolin Eutectic GmbH filed Critical Castolin Eutectic GmbH
Priority to EP22178399.6A priority Critical patent/EP4290082A1/de
Publication of EP4290082A1 publication Critical patent/EP4290082A1/de
Pending legal-status Critical Current

Links

Images

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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/321—Rotors specially for elastic fluids for axial flow pumps for axial flow compressors
    • F04D29/324—Blades
    • 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
    • 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
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/303—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the leading edge of a rotor blade
    • 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
    • F05D2300/10—Metals, alloys or intermetallic compounds
    • F05D2300/13—Refractory metals, i.e. Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W

Definitions

  • the invention relates to an improvement in the blades of fans for sucking in and discharging dust-laden gases.
  • the invention relates to a fan blade having a base body with a leading edge formed at least in part by an edge complementary member.
  • the invention relates to a method of manufacturing a fan blade, comprising the following process steps:
  • fans also referred to as “ventilators”
  • these fan blades generally move at a very high peripheral speed, so damage to these blades occurs over time.
  • the wear on the leading edge of the blades is particularly high and determines their service life. Therefore, a variety of countermeasures have already been proposed to minimize wear on the leading edges of fan blades.
  • the leading edge of the fan blade was hardened with a hardbanding of chromium carbide.
  • the technical service life of the blade reinforced in this way is quite short, e.g. about 10 days. After that, the fan must be dismounted and re-hardbanding must be performed on the blade in the repair facility, which takes about 3 days.
  • fan blade protection systems that utilize metallic caps attached to the leading edge of each blade is well known.
  • the metal caps absorb the impact energy upon collision with the dust particles or liquid droplets and serve as sacrificial material in favor of the fan blade behind them.
  • the caps wear out and must be replaced periodically. To do this, the cap must be removed and the underlying blade material repaired as needed. A new cap is then connected to the fan blade.
  • US 4,738,594 A describes a fan blade including blade protection and a method for its manufacture according to the generic art as mentioned above.
  • the fan blade is designed for an axial fan. It comprises a base body made of steel or aluminum in a conventional manner.
  • the base body has a leading edge covered with a leading edge cover member connected to the base body by screws.
  • the leading edge cover member is made of stainless steel and includes a top side leading edge cover and a bottom side leading edge cover, each of which is formed into the desired shape by press molding.
  • the leading edge of the base body is cut along its entire length to form a notch that extends along the leading edge and whose width is constant.
  • edge complementary member adapted to the geometry of the leading edge is inserted into the notch, and its upper and lower sides are welded to the leading edge covers.
  • the edge complementary member is made of a hard sintered body of metallic boron, a sintered body of a metal carbide such as tungsten carbide, or a sintered body of an inorganic oxide such as aluminum oxide.
  • Welding to the leading edge covers is done by electron beam welding. The weld beads, which extend upward and downward, are then removed by polishing, and the leading edge covers and the edge complementary member are coated with hard chrome as required.
  • the edge complementary member can be manufactured by cutting from a block of material. As this is extremely difficult with hard materials, such as a hard metal, it is alternatively proposed that a suitable powder is pressed into the desired shape and then sintered to produce an edge complementary member.
  • the fan blade known from US 4,738,594 A is intended for an axial fan. These often are operated at comparatively low rotational speeds. In various applications, however, high rotational speeds are required, resulting in high demands on the mechanical strength of the fan blades. For these applications, radial fans are often used.
  • the invention is therefore based on the task of specifying a method for manufacturing a fan blade which makes it possible to simplify and accelerate the manufacturing process for the leading edge protection and thereby keep the manufacturing costs low.
  • the invention is based on the task of providing a fan blade for use in environments with dust-containing or droplet-containing gases, which is characterized by a long service life, so that the downtimes of the plant are reduced, and which can also be used for radial fans.
  • the leading edge protection of the fan blade according to the invention is characterized in particular by the fact that a round groove runs in and along the front edge of the fan blade, and that the edge complementary member is designed as a round bar which is inserted in the round groove.
  • the round groove forms a longitudinal groove in the former leading edge of the base body of the fan blade. In cross-section, it encloses a segment of a circle and the groove bottom forms an arc of a circle.
  • the edge complementary member is designed as a round bar with a radius approximately matching that of the round groove (the radius of the round bar may be slightly smaller than that of the round groove).
  • the round bar forms the new leading edge of the fan blade. Due to its round shape it is somewhat less efficient in terms of flow mechanics than would be a sharp edge; however, round bars are easy to manufacture and are often even commercially available with the appropriate diameter as inexpensive semi-finished products and staple goods. And because of their simple round and non-complex shape, they exhibit high wear resistance, thus extending the service life of the fan blade.
  • the round bar is made of a wear-resistant material, preferably stainless steel, titanium carbide and, particularly preferably, tungsten carbide.
  • Tungsten carbide is characterized by a particularly high hardness of up to 2300 HV, and it is stable in air up to about 600°C.
  • Round bars of tungsten carbide are commercially available. The round bar is preferably a solid rod.
  • Titanium carbide is characterized by a particularly high hardness of up to 4000 HV, and it is stable in air up to about 800°C.
  • the manufacturing costs are further reduced if the round bar is cylindrical - i.e. not conical.
  • the manufacturing effort is further reduced if the base body is made of a metal plate with a constant thickness d.
  • Such metal plates are also easy to manufacture and are often commercially available with the appropriate thickness as low-cost semi-finished products and staple goods, such as metal plates made of steel, aluminum or titanium.
  • the round groove for receiving the round bar is machined into this end face.
  • the ratio between the outside diameter D of the round bar and the plate thickness d is preferably to be selected in the following range: 0.7 ⁇ d ⁇ D ⁇ 1.1 d, and most preferred: 0.8 ⁇ d ⁇ D ⁇ 1.05 ⁇ d.
  • the outer diameter of the round bar is the same as the thickness of the metal plate.
  • a preferred diameter range of the round bar is for example 10 to 20mm, more preferably 12 to 16mm If necessary, it is suitable for completely covering the face of the metal plate. Smaller outside diameters are basically usable; however, they lead to initially higher wear of the base body (metal plate) in the area of the free, unprotected end face. Larger outer diameters are also conceivable in principle; however, they cause unnecessary weight and adversely affect the flow mechanics of the fan blade.
  • the top surface of the base body is covered with an anti-wear layer.
  • the wear protection layer helps to extend the service life of the fan blade. It preferably has a thickness in the range from 1mm to 10mm, and consists of a base metal in which hard materials are incorporated which contain niobium, tungsten and/or vanadium, and which are present at least in part in the form of carbides, nitrides, borides, silicides or mixed phases thereof, especially chromium carbide or boron carbide.
  • Mixed phases are, for example, carboborides, carbonitrides and the like, which often have an even higher hardness than the simple components from which they are derived.
  • the method of manufacturing the fan blade according to the invention is characterized in particular by the fact that a round groove is produced in the leading edge of a base body, and that a round bar is provided as an edge complementary member and inserted into the round groove.
  • the round groove forms a longitudinal groove in the former leading edge of the base body. It is created, for example, by cutting, drilling or sandblasting, and in the simplest case by milling. In cross-section, it forms a depression in the shape of a segment of a circle, with the bottom of the groove forming an arc of a circle.
  • the edge complementary member is designed as a round bar with a radius approximately matching the round groove; the radius of the round bar can be somewhat smaller than that of the round groove.
  • the round bar is fixed in the round groove, preferably by soldering, and forms the "new" leading edge of the fan blade.
  • Round bars are easy to manufacture and are often even commercially available with the appropriate diameter as inexpensive semi-finished products and stacked goods. And due to their simple round and non-complex shape, they exhibit high wear resistance, thus extending the service life of the fan blade.
  • the manufacturing effort required to produce the fan blade is further reduced if the base body is made from a metal plate with a constant thickness d.
  • Such metal plates are also easy to manufacture and are often commercially available with the appropriate thickness as low-cost semi-finished products and staple goods, such as metal plates made of steel, aluminum or titanium.
  • the fan blade according to the invention is particularly suitable for the manufacture of a radial fan.
  • Radial fans are mainly used when high air flow rates and thus high fan speeds are required. Damage is particularly easy to occur in this case, which can be prevented or reduced by using fans according to the invention.
  • the fan blade 1 shown in Figure 1 is construed for use in an axial fan. It consists of an elongated base body in the form of a metal plate 2, the entire plane upper side of which is covered with a wear protection layer 3 ( Figure 1 shows a free section without the wear protection layer on the left side for better illustration).
  • the metal plate 2 is connected on one of its narrow sides to a connecting piece 4.
  • a round groove 5 is milled into one of the long end faces of the metal plate 2 over its entire length, into which a round bar 6 made of stainless steel is soldered. This end face forms the leading edge 7 of the fan blade 1.
  • the metal plate 2 is made of stainless steel. It is cut in fan-shaped plates having a length of 700mm and a maximal thickness of 10mm and a minimal thickness of 5mm at the leading edge.
  • the wear protection layer 3 consists of chromium carbide. It covers the entire upper surface of the metal plate 2 and has a thickness of 2mm. It is produced by laser hardfacing.
  • Circular groove 5 has a radius of 2.2mm, a depth of 2mm.
  • the round groove 5 thus forms a longitudinal groove along the total length in the former front side of the metal plate 2.
  • the round groove forms a depression in the shape of a segment of a circle, with the bottom of the round groove describing an arc of a circle.
  • the round bar 6 is soldered into the round groove 5 over its entire length by means of hard soldering. Its length corresponds to the length of the round groove 5 and its diameter is 4mm. It covers the entire long end face of the metal plate 2 and forms the front edge 7 of the fan blade 1.
  • the fan blade 10 shown schematically in Figure 2 is construed for use in an impeller of a radial fan.
  • the radial fan comprises an impeller with a plurality of curved blades 10.
  • Each blade 10 consists of an elongated base body in the form of a curved metal plate 12.
  • the leading edge 17 of the fan blade 10 is provided with a reinforcement member in form of a round solid rod 6 made of tungsten carbide.
  • the metal plate 12 has a constant thickness of 15mm and a length L of 210mm and made of steel.
  • a round groove 5 is milled into the leading edge 17 over its entire length to receive the tungsten carbide round rod 6.
  • the round rod 6 is brazed into the round groove 5 so that the round bar 6 forms the entire leading edge 17 of the fan blade 10.
  • the round groove 5 forms a longitudinal groove in the former front side of the metal plate 12.
  • the round groove 5 forms a depression in the shape of a segment of a circle, with the bottom of the round groove 5 describing an arc of a circle. It has a radius of 7.1mm, a depth of 6mm and a length L of 210mm.
  • the round rod 6 is brazed into the round groove 5 over its entire length by means of hard soldering. Its length corresponds to the length L of the round groove 5 and its diameter is 14mm. It covers the entire long end face of the metal plate 12 and forms the front edge 17 of the fan blade 10.
  • a wear protection layer 3 is applied onto one of the plane surfaces of the metal plate 12, which is the front surface in operation of the radial fan. It consists of chromium carbide and has a thickness of 3mm. The wear protection layer 3 covers the entire front surface of the metal plate 12. It is produced by arc buildup welding.
  • a blade base body is produced by cutting a commercially available rectangular metal plate 2 at an angle on one of its short sides and bent into the required curved shape.
  • a round groove 5 is milled on one of the opposite short sides.
  • the round rod 6 of tungsten carbide is brazed into the round groove 5 over its entire length (i.e. not just at points), which then forms the leading edge 17 of the fan blade 10. All fan blades of the impeller for the radial fan are manufactured in the same way and mounted on the impellers axis of rotation.
  • the service life of the fan blade, the leading edge of which is reinforced with the tungsten carbide rod, is increased by a factor of about 5 (from about 10 days to about 50 days) compared with the state of the art, in which the leading edge is provided with a hardband layer of CrC of comparable thickness.
  • the reduced downtime of the plant thus leads to considerable cost savings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP22178399.6A 2022-06-10 2022-06-10 Ventilatorflügel und verfahren zum herstellen desselben Pending EP4290082A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22178399.6A EP4290082A1 (de) 2022-06-10 2022-06-10 Ventilatorflügel und verfahren zum herstellen desselben

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22178399.6A EP4290082A1 (de) 2022-06-10 2022-06-10 Ventilatorflügel und verfahren zum herstellen desselben

Publications (1)

Publication Number Publication Date
EP4290082A1 true EP4290082A1 (de) 2023-12-13

Family

ID=82019289

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22178399.6A Pending EP4290082A1 (de) 2022-06-10 2022-06-10 Ventilatorflügel und verfahren zum herstellen desselben

Country Status (1)

Country Link
EP (1) EP4290082A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2389760A (en) * 1940-08-24 1945-11-27 Rotol Ltd Airscrew
US4738594A (en) 1986-02-05 1988-04-19 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Blades for axial fans
JP2002276595A (ja) * 2001-03-16 2002-09-25 Daikin Ind Ltd 送風機
EP1801352B1 (de) * 2005-12-21 2012-03-21 Rolls-Royce Deutschland Ltd & Co KG Vorderkantenausbildung für die Verdichterschaufeln von Gasturbinentriebwerken

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2389760A (en) * 1940-08-24 1945-11-27 Rotol Ltd Airscrew
US4738594A (en) 1986-02-05 1988-04-19 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Blades for axial fans
JP2002276595A (ja) * 2001-03-16 2002-09-25 Daikin Ind Ltd 送風機
EP1801352B1 (de) * 2005-12-21 2012-03-21 Rolls-Royce Deutschland Ltd & Co KG Vorderkantenausbildung für die Verdichterschaufeln von Gasturbinentriebwerken

Similar Documents

Publication Publication Date Title
EP1688211B1 (de) Reparatur von Metalllegierungen mit hohem Nickelgehalt mittels Plasmaschweissen
US7506822B2 (en) Slurry injector and methods of use thereof
EP0887143B1 (de) Herstellung oder Reparierung einer beschaufelten Scheibe durch Linearreibschweissen
EP2012958B1 (de) Stirnfräser
JP2013517952A (ja) 加工工具
CN103038010A (zh) 切削弯头及其制造方法
US20110255976A1 (en) Manufacturing method for closed vane wheels
CN111069666B (zh) 一种铣削加工方法
SE434607B (sv) Skerblad innefattande en kropp med tender samt forfarande for framstellning av detta
EP4290082A1 (de) Ventilatorflügel und verfahren zum herstellen desselben
CN102548682A (zh) 冷压修理压缩机的钛叶片
CN103624329A (zh) 可转位机卡式硬质合金齿圆锯片
EP3766619B1 (de) Verfahren zur herstellung von formteilen
US20070172319A1 (en) Milling tool and method for milling recesses
CN102451981A (zh) 切割刀刃的制造方法及该方法制造的切割刀刃
EP3638445B1 (de) Verfahren zur herstellung eines schneidwerkzeugs und schneidewerkzeug
EP3284906A1 (de) Turbinenkomponenten und herstellungsmethode
JP2001001209A (ja) 回転切削工具
CN113770670A (zh) 一种pcd立铣刀及其加工方法
KR20210034663A (ko) 경취성 난가공재용 다이아몬드 절삭 공구
Vasylkiv Features of using air-plasma cutting technology for manufacturing of helical flights and auger billets
Badiru From traditional manufacturing to additive manufacturing
WO2022032287A1 (en) System, method, and apparatus for improved cleaning of industrial furnaces
CN206527168U (zh) 一种水箱拉丝装置
EP3015211B1 (de) Verfahren zur herstellung von turbulatoren an einer turbomaschinenoberfläche durch auftragschweissen und entsprechende turbomaschine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20240612

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR