US3608976A - Fan blade having wear-resistant ribs and fan including a plurality of same - Google Patents

Fan blade having wear-resistant ribs and fan including a plurality of same Download PDF

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US3608976A
US3608976A US857525A US3608976DA US3608976A US 3608976 A US3608976 A US 3608976A US 857525 A US857525 A US 857525A US 3608976D A US3608976D A US 3608976DA US 3608976 A US3608976 A US 3608976A
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fan
rib
ribs
blade
base
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US857525A
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Fines A Zugelder
Ray K Dehn
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Stoody Co
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Assigned to STOODY COMPANY, A CORP. OF DE reassignment STOODY COMPANY, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CABOT CORPORATION, A CORP. OF DE
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Assigned to WELLS FARGO BANK, N.A. reassignment WELLS FARGO BANK, N.A. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STOODY DELORO STELLITE, INC.
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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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/289—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps having provision against erosion or for dust-separation

Definitions

  • a fan blade having a plurality 01' wear-resistant ribs extending across the width of its working surface and spaced along the length thereof for contacting solid particles, e.g. pulverized coal, to be propelled thereby.
  • a fan including a plurality of blades as above-described is also disclosed.
  • This invention relates to fan blades and to fans having a plurality of fan blades as a part thereof While not limited thereto, the fan and fan blades of the invention are particularly well suited for utilization in applications wherein the fan blades contact solid particles. For example, it is common practice in many power plants utilizing pulverized coal as a fuel, to blow the same into the boilers with a multibladed fan resembling a paddle wheel.
  • the fans usually include an outer casing or scroll containing a rotor assembly.
  • the rotor assembly generally consists of a rotor having a plurality of blades extending radially outward therefrom toward the wall of the casing.
  • the blades are generally formed from hardened steel plate in order to resist rapid erosion by the pulverized coal. Nevertheless, erosion is severe and accordingly, blade life is relatively short. In many boiler plants, the fan blades are replaced about every 6 months. This is both a time consuming and costly operation.
  • Another object is to provide a fan having fan blades which are particularly well suited for propelling solid particles such as pulverized coal and the like into a boiler and which will exhibit a substantially longer service life than those of the prior art.
  • H0. 1 is a perspective view of the fan of the invention with the casing shown in broken lines to illustrate the rotor assembly
  • FIG. 2 is a perspective view of a fan blade of the invention, a portion thereof being shown in section.
  • a fan blade having a working surface is provided with a plurality of ribs extending across it, the same being spaced along the length of the blade.
  • the ribs have an exposed surface containing a wear-resistant material.
  • each rib is substantially in the form of a right triangle in cross section, including a base portion, a sidewall portion and an inclined surface portion.
  • the working surface of the blade is provided with a plurality of grooves extending across its width for receiving the wear-resistant ribs.
  • a fan is provided according to the invention and includes a casing and rotor assembly.
  • the rotor assembly includes a plurality of blades having wear-resistant ribs as briefly described above and as more particularly described hereinafter.
  • a fan F is provided and includes a casing or scroll 10 having a rotor assembly 12.
  • the rotor assembly includes a rotor 14 having a plurality of blades 16 connected thereto.
  • the blades 16 extend radially outward from the rotor 14 toward the wall of the casing 10.
  • the fan casing 10 is provided with an intake opening 11 and an exhaust opening 13.
  • the fan also includes a drive means (not shown) connected to the rotor 14 in a conventional manner.
  • Each of the blades 16 has a working surface 17 which contacts solid particles, e.g. pulverized coal, as the rotor 14 is rotated during normal operation.
  • each blade has a plurality of substantially rectangular grooves 19 having a base 21 and sidewalls 23. The grooves extend across the width of the working surface and are spaced along the length thereof.
  • a plurality of wear-resistant ribs 20 extend outwardly from the grooves 19 into the path of particles being propelled by the fan.
  • the grooves and ribs are so aligned with respect to the blade that when the blades are assembled onto the rotor 14, they will be in a direction substantially parallel with the axis of the rotor.
  • the ribs 20 are substantially in the form of a right triangle in cross section, having a base portion 22, a sidewall portion 24 and an inclined surface portion 26.
  • the base portion 22 of each rib is bonded to the base 21 of each groove 19, either by brazing or with an adhesive cement.
  • the advantage gained by the use of a groove which is adapted in shape to receive each rib is that the forces set up during rotation of the blades act to push the ribs tightly against the base and sidewalls of the groove. This prevents the ribs from breaking away from the blades which would be more prevalent if they were bonded directly to a nongrooved working surface.
  • the outer surface of ribs 20 contain a wear-resistant material such as tungsten carbide or other material known to be highly wearresistant.
  • the ribs 20 may be fabricated entirely of wear-resistant material by known forming techniques, e.g. by a sintering process with or without some machining.
  • the ribs may also be fabricated of a base metal having a wear-resistant coating applied to the outer surface thereof by a plasma-spraying process in a conventional manner. It is important that the height h and angle of inclination 0 of the ribs as well as their spacing 1: along the length of the blades be constructed within certain limits. In order to substantially improve the service life of the blades, the angle of inclination 0 should be between 50 and 30 and the spacing at between ribs should be one-half to 2 times the length of the base portion 22 of the ribs 20.
  • the spacing x between ribs may be varied because of bolthole locations.
  • the height h of the sidewall portions 24 of the rib will be the variable which will probably be adjusted substantially, depending upon the particular fan construction utilized.
  • the substantially triangular ribs should point in the direction of rotation of the fan blades so that the solid particles contact the inclined surface portion 26 of the wear-resistant ribs instead of the working surface of the blades.
  • Steel fan blades having wear-resistant ribs with exposed surfaces containing tungsten carbide have exhibited substantially increased service life as compared with steel blades formed without ribs according to the prior art.
  • a fan blade designed for mounting in an outwardly extending radial fashion from a rotor so that the working surface of said blade is substantially forwardly aligned with respect to the direction of rotation of said rotor, the improvement comprising a plurality of ribs extending across said working surface and being spaced apart along the length thereof with the exposed surface of each rib containing a wear-resistant material and being shaped in the form of an inclined plane which rises in the outwardly extending direction.
  • each rib is substantially in the fonn of a right triangle in cross section including a base portion, a sidewall portion and an inclined surface portion, said base portion being bonded to the base of a mating groove in the working surface of the blade.
  • a fan including a casing and rotor assembly wherein the rotor has a plurality of blades connected thereto and extending radially outward therefrom toward the wall of the casing with the working surface of each blade being substantially parallel with the axis of said rotor, the improvement comprising a plurality of ribs extending across said working surface and spaced apart along the length thereof with the exposed surface of each rib containing a wear-resistant material and being shaped in the fonn of an inclined plane the apex of which is at the edge away from said rotor.

Abstract

A fan blade is disclosed having a plurality of wear-resistant ribs extending across the width of its working surface and spaced along the length thereof for contacting solid particles, e.g. pulverized coal, to be propelled thereby. A fan including a plurality of blades as above-described is also disclosed.

Description

United States Patent Inventors Fines A. Zugelder 335 Laramie Lane, Kokomo, Ind. 46901; Ray K. Dehn, 2940 Galahad Drive, Indianapolis, Ind. 46208 Appl. No. 857,525
Filed Sept. 12, 1969 Patented Sept. 28, 1971 FAN BLADE HAVING WEAR-RESISTANT RIBS AND FAN INCLUDING A PLURALITY 0F SAME 8 Claims, 2 Drawing Figs.
US. Cl 302/37,
415/212, 416/236, 416/229 Int. Cl B652 53/40 Field of Search 415/98.
[56] References Cited UNITED STATES PATENTS 1,233,115 7/1917 Osborne 302/37 1,753,936 4/1920 302/37 1,806,494 5/1931 302/37 2,616,964 11/1952 415/213 2,853,271 9/1958 Findley 416/229 Primary Examiner-C. J. Husar Attorneys-Arthur S. Collins, Kenneth W. Brown, Barry R.
Blaker and Lawrence H. Chaletsky ABSTRACT: A fan blade is disclosed having a plurality 01' wear-resistant ribs extending across the width of its working surface and spaced along the length thereof for contacting solid particles, e.g. pulverized coal, to be propelled thereby. A fan including a plurality of blades as above-described is also disclosed.
FAN BLADE HAVING WEAR-RESISTANT RIBS AND FAN INCLUDING A PLURALITY OF SAME This invention relates to fan blades and to fans having a plurality of fan blades as a part thereof While not limited thereto, the fan and fan blades of the invention are particularly well suited for utilization in applications wherein the fan blades contact solid particles. For example, it is common practice in many power plants utilizing pulverized coal as a fuel, to blow the same into the boilers with a multibladed fan resembling a paddle wheel.
The fans usually include an outer casing or scroll containing a rotor assembly. The rotor assembly generally consists of a rotor having a plurality of blades extending radially outward therefrom toward the wall of the casing. The blades are generally formed from hardened steel plate in order to resist rapid erosion by the pulverized coal. Nevertheless, erosion is severe and accordingly, blade life is relatively short. In many boiler plants, the fan blades are replaced about every 6 months. This is both a time consuming and costly operation.
It is an object of the invention to provide a fan blade which will not erode easily when subjected to contact with solid particles;
Another object is to provide a fan having fan blades which are particularly well suited for propelling solid particles such as pulverized coal and the like into a boiler and which will exhibit a substantially longer service life than those of the prior art.
ln the drawings:
H0. 1 is a perspective view of the fan of the invention with the casing shown in broken lines to illustrate the rotor assembly, and
FIG. 2 is a perspective view of a fan blade of the invention, a portion thereof being shown in section.
According to the invention, a fan blade having a working surface is provided with a plurality of ribs extending across it, the same being spaced along the length of the blade. The ribs have an exposed surface containing a wear-resistant material. Preferably. each rib is substantially in the form of a right triangle in cross section, including a base portion, a sidewall portion and an inclined surface portion. Preferably, the working surface of the blade is provided with a plurality of grooves extending across its width for receiving the wear-resistant ribs.
A fan is provided according to the invention and includes a casing and rotor assembly. The rotor assembly includes a plurality of blades having wear-resistant ribs as briefly described above and as more particularly described hereinafter.
Referring now to the drawings, a fan F is provided and includes a casing or scroll 10 having a rotor assembly 12. The rotor assembly includes a rotor 14 having a plurality of blades 16 connected thereto. The blades 16 extend radially outward from the rotor 14 toward the wall of the casing 10. The fan casing 10 is provided with an intake opening 11 and an exhaust opening 13. The fan also includes a drive means (not shown) connected to the rotor 14 in a conventional manner. Each of the blades 16 has a working surface 17 which contacts solid particles, e.g. pulverized coal, as the rotor 14 is rotated during normal operation. Preferably, each blade has a plurality of substantially rectangular grooves 19 having a base 21 and sidewalls 23. The grooves extend across the width of the working surface and are spaced along the length thereof. A plurality of wear-resistant ribs 20 extend outwardly from the grooves 19 into the path of particles being propelled by the fan.
The grooves and ribs are so aligned with respect to the blade that when the blades are assembled onto the rotor 14, they will be in a direction substantially parallel with the axis of the rotor.
The ribs 20 are substantially in the form of a right triangle in cross section, having a base portion 22, a sidewall portion 24 and an inclined surface portion 26. Preferably, the base portion 22 of each rib is bonded to the base 21 of each groove 19, either by brazing or with an adhesive cement. The advantage gained by the use of a groove which is adapted in shape to receive each rib is that the forces set up during rotation of the blades act to push the ribs tightly against the base and sidewalls of the groove. This prevents the ribs from breaking away from the blades which would be more prevalent if they were bonded directly to a nongrooved working surface. The outer surface of ribs 20 contain a wear-resistant material such as tungsten carbide or other material known to be highly wearresistant. The ribs 20 may be fabricated entirely of wear-resistant material by known forming techniques, e.g. by a sintering process with or without some machining. The ribs may also be fabricated of a base metal having a wear-resistant coating applied to the outer surface thereof by a plasma-spraying process in a conventional manner. It is important that the height h and angle of inclination 0 of the ribs as well as their spacing 1: along the length of the blades be constructed within certain limits. In order to substantially improve the service life of the blades, the angle of inclination 0 should be between 50 and 30 and the spacing at between ribs should be one-half to 2 times the length of the base portion 22 of the ribs 20. In practice, the spacing x between ribs may be varied because of bolthole locations. In this case, because the angle of the inclination will remain within close limits, the height h of the sidewall portions 24 of the rib will be the variable which will probably be adjusted substantially, depending upon the particular fan construction utilized. The substantially triangular ribs should point in the direction of rotation of the fan blades so that the solid particles contact the inclined surface portion 26 of the wear-resistant ribs instead of the working surface of the blades.
Steel fan blades having wear-resistant ribs with exposed surfaces containing tungsten carbide have exhibited substantially increased service life as compared with steel blades formed without ribs according to the prior art.
While the invention has been described in connection with the specific fan and fan blades shown in the drawings, it should be understood that various modifications and changes may be made without departing from the spirit and scope of the invention. For example, while the term fan blade has been utilized throughout the specification and claims, the term should also be interpreted to include an impeller blade. Substantially the same construction may be utilized in turbines and pumps as well as in fans.
What is claimed is:
1. In a fan blade designed for mounting in an outwardly extending radial fashion from a rotor so that the working surface of said blade is substantially forwardly aligned with respect to the direction of rotation of said rotor, the improvement comprising a plurality of ribs extending across said working surface and being spaced apart along the length thereof with the exposed surface of each rib containing a wear-resistant material and being shaped in the form of an inclined plane which rises in the outwardly extending direction.
2. Apparatus as claimed in claim 1, wherein each rib is substantially in the fonn of a right triangle in cross section including a base portion, a sidewall portion and an inclined surface portion, said base portion being bonded to the base of a mating groove in the working surface of the blade.
3. Apparatus as claimed in claim 2, wherein the angle of inclination formed between the inclined surface portion of the rib and the base of the rib is between 5 and 30 and wherein the spacing between ribs is one-half to 2 times the length of the base portion of the rib.
4. In a fan including a casing and rotor assembly wherein the rotor has a plurality of blades connected thereto and extending radially outward therefrom toward the wall of the casing with the working surface of each blade being substantially parallel with the axis of said rotor, the improvement comprising a plurality of ribs extending across said working surface and spaced apart along the length thereof with the exposed surface of each rib containing a wear-resistant material and being shaped in the fonn of an inclined plane the apex of which is at the edge away from said rotor.
5. A fan as claimed in claim 4, wherein the ribs have a coating of tungsten carbide on their exposed surfaces in order to make the same wear resistant.
in the working surface of the blade.
8. A fan as claimed in claim 7, wherein the angle of inclination formed between the inclined surface portion of each rib and the base of each rib is between 5 and 30 and wherein the spacing between ribs is one-half to 2 times the length of the base portion of each rib.

Claims (8)

1. In a fan blade designed for mounting in an outwardly extending radial fashion from a rotor so that the working surface of said blade is substantially forwardly aligned with respect to the direction of rotation of said rotor, the improvement comprising a plurality of ribs extending across said working surface and being spaced apart along the lengTh thereof with the exposed surface of each rib containing a wear-resistant material and being shaped in the form of an inclined plane which rises in the outwardly extending direction.
2. Apparatus as claimed in claim 1, wherein each rib is substantially in the form of a right triangle in cross section including a base portion, a sidewall portion and an inclined surface portion, said base portion being bonded to the base of a mating groove in the working surface of the blade.
3. Apparatus as claimed in claim 2, wherein the angle of inclination formed between the inclined surface portion of the rib and the base of the rib is between 5* and 30* and wherein the spacing between ribs is one-half to 2 times the length of the base portion of the rib.
4. In a fan including a casing and rotor assembly wherein the rotor has a plurality of blades connected thereto and extending radially outward therefrom toward the wall of the casing with the working surface of each blade being substantially parallel with the axis of said rotor, the improvement comprising a plurality of ribs extending across said working surface and spaced apart along the length thereof with the exposed surface of each rib containing a wear-resistant material and being shaped in the form of an inclined plane the apex of which is at the edge away from said rotor.
5. A fan as claimed in claim 4, wherein the ribs have a coating of tungsten carbide on their exposed surfaces in order to make the same wear resistant.
6. A fan as claimed in claim 4, wherein the working surface of each blade has a plurality of grooves extending across its width, each groove having a base and sidewalls, said ribs being bonded to the blades in the grooves thereof.
7. A fan as claimed in claim 6, wherein each rib is substantially in the form of a right triangle in cross section including a base portion, a sidewall portion and an inclined surface portion, said base portion being bonded to the base of the groove in the working surface of the blade.
8. A fan as claimed in claim 7, wherein the angle of inclination formed between the inclined surface portion of each rib and the base of each rib is between 5* and 30* and wherein the spacing between ribs is one-half to 2 times the length of the base portion of each rib.
US857525A 1969-09-12 1969-09-12 Fan blade having wear-resistant ribs and fan including a plurality of same Expired - Lifetime US3608976A (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3869777A (en) * 1971-08-27 1975-03-11 Alsthom Cgee Component parts of welded rotors
EP0075846A1 (en) * 1981-09-25 1983-04-06 Union Carbide Corporation Wear resistant fan blade for centrifugal fan
US4443152A (en) * 1977-10-03 1984-04-17 Rockwell International Corporation Axial slurry pump
US4671740A (en) * 1982-06-10 1987-06-09 Wilbanks International, Inc. Ceramic coated abrasion resistant member and process for making
US5038014A (en) * 1989-02-08 1991-08-06 General Electric Company Fabrication of components by layered deposition
US5363778A (en) * 1993-04-15 1994-11-15 Combustion Engineering, Inc. High efficiency exhauster for a solid fuel pulverizing and firing system
US6004097A (en) * 1997-09-26 1999-12-21 Sure Alloy Steel Corp. Coal mill exhauster fan
US20030117889A1 (en) * 2001-12-20 2003-06-26 Alfredo Li Preti Self-cleaning mix head having a longitudinal mixer for a molding system
WO2003104615A1 (en) * 2002-06-10 2003-12-18 Siemens Aktiengesellschaft Workpiece with erosion-reducing surface structure
US6705554B1 (en) * 1999-06-09 2004-03-16 Voith Sulzer Papiertechnik Patent Gmbh Rotor for a paper stock processing machine, anti-wear element for such a rotor, and paper stock processing apparatus
US20050147498A1 (en) * 2004-01-02 2005-07-07 Tsan-Nan Chien Heat-dissipating module, fan structure and impeller thereof
US20100240478A1 (en) * 2007-10-12 2010-09-23 Tosy Robotics Joint Stock Company Boomerang
US20120199580A1 (en) * 2009-08-20 2012-08-09 Electrolux Home Products Corporation N.V. wave stirrer for a microwave oven
US20140086006A1 (en) * 2012-09-26 2014-03-27 Traid Capital Group, LLC Mixing device

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2476434A1 (en) * 1980-02-26 1981-08-28 Deere John Cie Francaise HARVESTING MACHINE FAN
GB2296743A (en) * 1995-01-06 1996-07-10 Huang Yung Chung Fan
DE29706042U1 (en) * 1997-04-05 1997-06-19 Schneider Gabriele Device for discharging fine-grained or powdery material
DE102009003170A1 (en) * 2009-05-15 2010-12-02 BSH Bosch und Siemens Hausgeräte GmbH Fan wheel, blower with a fan wheel, clothes dryer with a fan and method of manufacturing a fan
CN110107534A (en) * 2019-06-05 2019-08-09 西北工业大学 A kind of blade surface notching construction of structure parameterization

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1233115A (en) * 1916-04-08 1917-07-10 Clarence N Mack Centrifugal conveyer-fan.
US1753936A (en) * 1926-06-17 1930-04-08 Westinghouse Electric & Mfg Co Blower for powdered fuel
US1806494A (en) * 1928-02-23 1931-05-19 James D O'brien Protective lining
US2616964A (en) * 1949-05-19 1952-11-04 Philco Corp Synchronizing separator for television receivers
US2853271A (en) * 1951-06-28 1958-09-23 Eaton Mfg Co Blade structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1233115A (en) * 1916-04-08 1917-07-10 Clarence N Mack Centrifugal conveyer-fan.
US1753936A (en) * 1926-06-17 1930-04-08 Westinghouse Electric & Mfg Co Blower for powdered fuel
US1806494A (en) * 1928-02-23 1931-05-19 James D O'brien Protective lining
US2616964A (en) * 1949-05-19 1952-11-04 Philco Corp Synchronizing separator for television receivers
US2853271A (en) * 1951-06-28 1958-09-23 Eaton Mfg Co Blade structure

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3869777A (en) * 1971-08-27 1975-03-11 Alsthom Cgee Component parts of welded rotors
US4443152A (en) * 1977-10-03 1984-04-17 Rockwell International Corporation Axial slurry pump
EP0075846A1 (en) * 1981-09-25 1983-04-06 Union Carbide Corporation Wear resistant fan blade for centrifugal fan
US4441857A (en) * 1981-09-25 1984-04-10 Union Carbide Corporation Wear resistant fan blade for centrifugal fan
US4671740A (en) * 1982-06-10 1987-06-09 Wilbanks International, Inc. Ceramic coated abrasion resistant member and process for making
US5038014A (en) * 1989-02-08 1991-08-06 General Electric Company Fabrication of components by layered deposition
US5363778A (en) * 1993-04-15 1994-11-15 Combustion Engineering, Inc. High efficiency exhauster for a solid fuel pulverizing and firing system
US6004097A (en) * 1997-09-26 1999-12-21 Sure Alloy Steel Corp. Coal mill exhauster fan
US6705554B1 (en) * 1999-06-09 2004-03-16 Voith Sulzer Papiertechnik Patent Gmbh Rotor for a paper stock processing machine, anti-wear element for such a rotor, and paper stock processing apparatus
US20030117889A1 (en) * 2001-12-20 2003-06-26 Alfredo Li Preti Self-cleaning mix head having a longitudinal mixer for a molding system
US6726355B2 (en) * 2001-12-20 2004-04-27 Mirolin Industries Corporation Self-cleaning mix head having a longitudinal mixer for a molding system
WO2003104615A1 (en) * 2002-06-10 2003-12-18 Siemens Aktiengesellschaft Workpiece with erosion-reducing surface structure
US20050147498A1 (en) * 2004-01-02 2005-07-07 Tsan-Nan Chien Heat-dissipating module, fan structure and impeller thereof
US20100240478A1 (en) * 2007-10-12 2010-09-23 Tosy Robotics Joint Stock Company Boomerang
US8608598B2 (en) * 2007-10-12 2013-12-17 Tosy Robotics Joint Stock Company Boomerang
US20120199580A1 (en) * 2009-08-20 2012-08-09 Electrolux Home Products Corporation N.V. wave stirrer for a microwave oven
US20140086006A1 (en) * 2012-09-26 2014-03-27 Traid Capital Group, LLC Mixing device
US9849430B2 (en) * 2012-09-26 2017-12-26 Triad Capital Group, Llc Mixing device

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GB1331463A (en) 1973-09-26
DE2042714A1 (en) 1971-03-18

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