US2884187A - Centrifugal blower wheel - Google Patents

Centrifugal blower wheel Download PDF

Info

Publication number
US2884187A
US2884187A US568793A US56879356A US2884187A US 2884187 A US2884187 A US 2884187A US 568793 A US568793 A US 568793A US 56879356 A US56879356 A US 56879356A US 2884187 A US2884187 A US 2884187A
Authority
US
United States
Prior art keywords
flanges
blades
blade
wheel
centrifugal blower
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.)
Expired - Lifetime
Application number
US568793A
Inventor
Lunde Einar
William T Nichols
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.)
Trane Co
Original Assignee
Trane Co
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 Trane Co filed Critical Trane Co
Priority to US568793A priority Critical patent/US2884187A/en
Application granted granted Critical
Publication of US2884187A publication Critical patent/US2884187A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/49329—Centrifugal blower or fan
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49915—Overedge assembling of seated part
    • Y10T29/49922—Overedge assembling of seated part by bending over projecting prongs

Definitions

  • This invention relates to improvements in centrifugal blower wheels and more particularly to an improved arrangement for assembling the cylindrical body structure of a blower wheel to an associated hub plate.
  • the blade structure of this invention is such that the fan blades are assembled into a unitary flexible strip by the machine which forms the blades.
  • -lt is an object of this invention to provide'a blade structure by which the blades are interlocked into a unitary flexible strip.
  • Figure l is a sectional view of the blower wheel taken on line 11 of Figure 5;
  • Figure 2 is an exploded perspective view of a portion of the blower Wheel showing the blade structure
  • Figure 3 is an elevational end view of a blade before the interlocking tabs have been formed over;
  • Figure 4 is a partial side view of a blade with the interlocking tabs completely formed
  • Figure 5 is a sectional view of a single width wheel taken on line 55 of Figure 1;
  • Figure 6 is a sectional view of a double width wheel taken on an axial plane
  • Figure 7 is an elevational view of part of a wheel showing the weld securing the blades together at the end remote from the hub plate.
  • numeral 10 designates a hub plate to which is secured a hub 12 and blades 14.
  • the blade 14 has a vane portion 16 which is arcuate or substantially arcuate in cross-section .and a flange base portion 18 at each end extending at right angles to the vane portion 16.
  • Extending from the flange base portions 18 are flange end portions 20 offset outwardly from the flange base portions 18 so that the flange end portions 20 will receive there'between the flange base portions 18 of the next adjacent blade.
  • the shoulder 19 between the flange base portion and the flange end portion has a radius of curvaice ture substantially the same as the convex surface of the vane portion 16 of the blade.
  • the flange base portion 18 of each blade has a recessed outer edge 21 and a recessed inner edge 22 both of circular form and having their axes of curvature substantially at the axis of curvature of the convex surface of the vane portion 16 of the blade.
  • the flange end portion 20 of each blade has inwardly extending interlocking tabs 24 and 26 which engage in the recessed outer edge 21 .and the recessed inner edge 22 respectively of the flange base portion of the next adjacent blade to hold the blades in the form of a flexible strip leaving the blade forming press.
  • the interlocking tabs 24 of the first blade of a blade assembly are not formed over but lie in the plane of the flange end portion 20 as shown in Figures 2 and 3.
  • the interlocking tabs 24 .and 26 of succeeding blades are formed over to lock the blade to the next preceding blade. In this manner the blade forming press interlocks the required number of blades for the wheel.
  • a strip having the required number of blades 14 for agiven Wheel is then placed on a fixture having a cylindrical outer surface strip and the tabs 24 of the first blade are formed over against the recessed outer edges 21 of fixture with the inwardly extending bead 32 of the hub plate engaging the inner edge of one end of the blade assembly as shown in Figure 5.
  • the blade assembly and the hub plate are then welded together by arc welding a bead 34 to join the end flanges of the blades 14 at one end of the Wheel while simultaneously welding a bead 36 to join the end flanges of the blades 14 at the other end to each other and to the hub plate 10.
  • FIG. 6 shows a double Width wheel.
  • a hub plate 10 is placed in the fixture and a blade assembly is placed in the fixture on each side of the hub plate 10.
  • a welding bead 38 is then produced at the outer ends of the blade assembly to join the end flanges of the blades 14, and simultaneously therewith a welding head 40 is produced to join the inner end flanges of the blades to each other and to the hub plate 10.
  • arc welding other forms of welding may be used.
  • the end flanges of the blades may be secured to each other and to the hub plate by gas welding or electric resistance welding or by solder dipping.
  • the wheel assembly can be made by brazing the end flanges of the blades and the hub plate 10 to each other at their areas of contact.
  • the welds may be made by the salt bath brazing process, and surfaces to be welded have a thin coating of an alloy having a lower melting temperature than the base metal.
  • a centrifugal blower wheel comprising a plurality of blades, each of said blades having flanges thereon lying in planes which are substantially radial of said wheel, the flanges of the blades overlapping the flanges of the next adjacent blades, interlocking means on the side edges of said flanges to hold the blades together.
  • said flanges being merged together in a weld to form wheel rims, and a hub plate welded to one of said wheel rims.
  • each of said blades having a vane portion and flanges extending from each end of the vane portion with said flanges lying in planes which are substantially normal to said vane portion, each of said flanges having a base portion and an outwardly offset end portion, the outwardly offset end portions of the flanges of each blade receiving therebetween the base portions of the flanges of the next adjacent blade, said flanges having recesses in their side edges and tabs extending from their Side edges and extending into the recesses of the flanges of the next adjacent blade, means Welding said otfset end portions of the flanges to said base portions of the flanges received therebetween to form continuous wheel rims.
  • each of said blades having a vane portion and flanges extending from each end of the vane portion with said flanges lying in planes which are substantially normal to said vane portion, each of said flanges having a base portion and an outwardly oflset end portion, the outwardly oflset end portions of the flanges of each blade receiving therebetween the base portions of the flanges of the next adjacent blade, recesses in the edges of said flanges and tabs on the edges of said flanges, said tabs extending into the recesses of the flanges of the next adjacent blade.
  • each of said blades having a vane portion and flanges extending from each end of the vane portion with said flanges lying in planes which are substantially normal to said vane portion, each of said flanges having a base portion and an outwardly oflfset end portion, the outwardly oflset end portions of the flanges of each blade receiving therebetween the base portions of the flanges of the next adjacent blade, recesses in the edges of said flanges and tabs on the edges of said flanges, said tabs extending into the recesses of the flanges of the next adjacent blade, means welding together the flanges at one end of the wheel, a hub plate abutting the other flanges of the blades and means Welding together the hub plate and said other flanges of the blades.
  • each of said blades having a vane portion and flanges extending from each end of the vane portion with the flanges lying in planes substantially normal to said vane portion, each of said flanges having a base portion and an outwardly oflset end portion, the

Landscapes

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

Description

April 28, 1959 E. LUNDE ET AL CENTEIFUGAL BLOWER WHEEL Filed March 1, 1956 2 Sheets-Sheet 1 INVENTOR. E/NAR LUNDE BY WILLIAM T NICHOLS M v away A TTOR NE VS April 28, 1959 Filed March 1, 1956 Pig. 5.
E. LUNDE ET AL CENTRIFUGAL BLOWER WHEEL 2 Sheets-Sheet 2 INVENTOR. E/NAR LUNDE WILL/AM T NICHOLS ATTORNEYS U S at s P m;
CENTRIFUGAL BLOWER WHEEL Einar Lunde and William T. Nichols, La Crosse, Wis., assignors to The Trane Company, La Crosse, Wis., a
corporation of Wisconsin Application March 1, 1956, Serial No. 568,793
Claims. (Cl. 230-134) This invention relates to improvements in centrifugal blower wheels and more particularly to an improved arrangement for assembling the cylindrical body structure of a blower wheel to an associated hub plate.
Heretofore in the manufacture of centrifugal blower wheels, the process of assembling the large number of parts required for the complete wheel has been a time consuming and expensive operation. The blade structure of this invention is such that the fan blades are assembled into a unitary flexible strip by the machine which forms the blades. By reason of this construction, the number of parts required for ,a complete wheel is reduced and the assembly of the wheel is simplified.
-lt is an object of this invention to provide'a blade structure by which the blades are interlocked into a unitary flexible strip.
It is another object of the invention to provide a blade structure by which flanges on the blades form rim portions of the Wheel.
It is another object to provide a blower wheel which has a maximum effective blade length with only a relatively small space at the ends for blade retention.
It is still another object of the invention to provide a centrifugal blower Wheel in which the parts thereof can be assembled very rapidly so that the wheels can be manufactured in quantities with low cost for labor and material.
Other objects and advantages of the invention will become apparent as the specification proceeds to describe the invention with reference to the accompanying drawings in which:
Figure l is a sectional view of the blower wheel taken on line 11 of Figure 5;
Figure 2 is an exploded perspective view of a portion of the blower Wheel showing the blade structure;
Figure 3 is an elevational end view of a blade before the interlocking tabs have been formed over;
Figure 4 is a partial side view of a blade with the interlocking tabs completely formed;
Figure 5 is a sectional view of a single width wheel taken on line 55 of Figure 1;
Figure 6 is a sectional view of a double width wheel taken on an axial plane;
Figure 7 is an elevational view of part of a wheel showing the weld securing the blades together at the end remote from the hub plate.
Referring now to the drawings and particularly Figures l and 2, numeral 10 designates a hub plate to which is secured a hub 12 and blades 14. The blade 14 has a vane portion 16 which is arcuate or substantially arcuate in cross-section .and a flange base portion 18 at each end extending at right angles to the vane portion 16. Extending from the flange base portions 18 are flange end portions 20 offset outwardly from the flange base portions 18 so that the flange end portions 20 will receive there'between the flange base portions 18 of the next adjacent blade. The shoulder 19 between the flange base portion and the flange end portion has a radius of curvaice ture substantially the same as the convex surface of the vane portion 16 of the blade.
The flange base portion 18 of each blade has a recessed outer edge 21 and a recessed inner edge 22 both of circular form and having their axes of curvature substantially at the axis of curvature of the convex surface of the vane portion 16 of the blade. The flange end portion 20 of each blade has inwardly extending interlocking tabs 24 and 26 which engage in the recessed outer edge 21 .and the recessed inner edge 22 respectively of the flange base portion of the next adjacent blade to hold the blades in the form of a flexible strip leaving the blade forming press. The interlocking tabs 24 of the first blade of a blade assembly are not formed over but lie in the plane of the flange end portion 20 as shown in Figures 2 and 3. The interlocking tabs 24 .and 26 of succeeding blades are formed over to lock the blade to the next preceding blade. In this manner the blade forming press interlocks the required number of blades for the wheel.
A strip having the required number of blades 14 for agiven Wheel is then placed on a fixture having a cylindrical outer surface strip and the tabs 24 of the first blade are formed over against the recessed outer edges 21 of fixture with the inwardly extending bead 32 of the hub plate engaging the inner edge of one end of the blade assembly as shown in Figure 5. The blade assembly and the hub plate are then welded together by arc welding a bead 34 to join the end flanges of the blades 14 at one end of the Wheel while simultaneously welding a bead 36 to join the end flanges of the blades 14 at the other end to each other and to the hub plate 10.
Figure 6 shows a double Width wheel. In making this wheel a hub plate 10 is placed in the fixture and a blade assembly is placed in the fixture on each side of the hub plate 10. A welding bead 38 is then produced at the outer ends of the blade assembly to join the end flanges of the blades 14, and simultaneously therewith a welding head 40 is produced to join the inner end flanges of the blades to each other and to the hub plate 10.
It should be understood that although we prefer to use arc welding, other forms of welding may be used. For instance the end flanges of the blades may be secured to each other and to the hub plate by gas welding or electric resistance welding or by solder dipping. It is also contemplated that the wheel assembly can be made by brazing the end flanges of the blades and the hub plate 10 to each other at their areas of contact. When the wheel is made of aluminum, the welds may be made by the salt bath brazing process, and surfaces to be welded have a thin coating of an alloy having a lower melting temperature than the base metal.
While We have described the foregoing preferred embodiments of our invention, we contemplate that many changes may be made without departing from the scope or spirit of our invention, and we desire to be limited only by the claims.
We claim:
1. A centrifugal blower wheel comprising a plurality of blades, each of said blades having flanges thereon lying in planes which are substantially radial of said wheel, the flanges of the blades overlapping the flanges of the next adjacent blades, interlocking means on the side edges of said flanges to hold the blades together. said flanges being merged together in a weld to form wheel rims, and a hub plate welded to one of said wheel rims.
2. In a centrifugal blower wheel the combination of a plurality of blades, each of said blades having a vane portion and flanges extending from each end of the vane portion with said flanges lying in planes which are substantially normal to said vane portion, each of said flanges having a base portion and an outwardly offset end portion, the outwardly offset end portions of the flanges of each blade receiving therebetween the base portions of the flanges of the next adjacent blade, said flanges having recesses in their side edges and tabs extending from their Side edges and extending into the recesses of the flanges of the next adjacent blade, means Welding said otfset end portions of the flanges to said base portions of the flanges received therebetween to form continuous wheel rims.
3. In a centrifugal blower wheel the combination of a plurality of blades, each of said blades having a vane portion and flanges extending from each end of the vane portion with said flanges lying in planes which are substantially normal to said vane portion, each of said flanges having a base portion and an outwardly oflset end portion, the outwardly oflset end portions of the flanges of each blade receiving therebetween the base portions of the flanges of the next adjacent blade, recesses in the edges of said flanges and tabs on the edges of said flanges, said tabs extending into the recesses of the flanges of the next adjacent blade.
4. In a centrifugal blower wheel the combination of a plurality of blades, each of said blades having a vane portion and flanges extending from each end of the vane portion with said flanges lying in planes which are substantially normal to said vane portion, each of said flanges having a base portion and an outwardly oflfset end portion, the outwardly oflset end portions of the flanges of each blade receiving therebetween the base portions of the flanges of the next adjacent blade, recesses in the edges of said flanges and tabs on the edges of said flanges, said tabs extending into the recesses of the flanges of the next adjacent blade, means welding together the flanges at one end of the wheel, a hub plate abutting the other flanges of the blades and means Welding together the hub plate and said other flanges of the blades.
5. In a centrifugal blower wheel the combination of an annular row of blades, each of said blades having a vane portion and flanges extending from each end of the vane portion with the flanges lying in planes substantially normal to said vane portion, each of said flanges having a base portion and an outwardly oflset end portion, the
outwardly offset end portions of the flanges of each blade receiving therebetween the base portions of the flanges of the next adjacent blade, a continuous annular bead welded to the base portions and end portions of the flanges of the blades *at one end of the wheel, a hub plate abutting the other flanges of the blades, and means at the periphery of said hub plate welding together the hub plate and said other flanges of the blades.
References Cited in the file of this patent UNITED STATES PATENTS 1,745,854 Lawaczeck Feb. 4, 1930 2,231,062 Evans Feb. 11, 1941 2,458,041 Wessel Jan. 4, 1949 2,632,397 Jandasek Mar. 24, 1953 FOREIGN PATENTS 267,405 Great Britain Mar. 17, 1927 339,565 Germany July 29, 1921
US568793A 1956-03-01 1956-03-01 Centrifugal blower wheel Expired - Lifetime US2884187A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US568793A US2884187A (en) 1956-03-01 1956-03-01 Centrifugal blower wheel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US568793A US2884187A (en) 1956-03-01 1956-03-01 Centrifugal blower wheel

Publications (1)

Publication Number Publication Date
US2884187A true US2884187A (en) 1959-04-28

Family

ID=24272767

Family Applications (1)

Application Number Title Priority Date Filing Date
US568793A Expired - Lifetime US2884187A (en) 1956-03-01 1956-03-01 Centrifugal blower wheel

Country Status (1)

Country Link
US (1) US2884187A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2988006A (en) * 1959-06-11 1961-06-13 John E Becker Fluid couplings
JPS6214199U (en) * 1985-07-10 1987-01-28
EP0609871A1 (en) * 1993-02-04 1994-08-10 PUNKER GmbH & CO. Radial blower
DE4309118C1 (en) * 1993-02-04 1994-09-01 Punker Gmbh & Co Radial fan
WO1999064746A1 (en) * 1998-06-09 1999-12-16 Escola Del Treball Del Ripolles, Fundacio Sf Rotor for fans

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE339565C (en) * 1916-12-08 1921-07-29 Ljungstroms Angturbin Ab Formation of tight butt joints between turbine blade heads
GB267405A (en) * 1926-09-09 1927-03-17 Charles Oliver Improvements in or relating to shrouding for turbine blades and the like
US1745854A (en) * 1926-12-18 1930-02-04 Worthington Pump & Mach Corp Rotary hydraulic machine, especially centrifugal pump
US2231062A (en) * 1939-01-07 1941-02-11 Torrington Mfg Co Centrifugal blower
US2458041A (en) * 1945-07-14 1949-01-04 Utillity Appliance Corp Rotor
US2632397A (en) * 1949-02-10 1953-03-24 Chrysler Corp Rotor wheel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE339565C (en) * 1916-12-08 1921-07-29 Ljungstroms Angturbin Ab Formation of tight butt joints between turbine blade heads
GB267405A (en) * 1926-09-09 1927-03-17 Charles Oliver Improvements in or relating to shrouding for turbine blades and the like
US1745854A (en) * 1926-12-18 1930-02-04 Worthington Pump & Mach Corp Rotary hydraulic machine, especially centrifugal pump
US2231062A (en) * 1939-01-07 1941-02-11 Torrington Mfg Co Centrifugal blower
US2458041A (en) * 1945-07-14 1949-01-04 Utillity Appliance Corp Rotor
US2632397A (en) * 1949-02-10 1953-03-24 Chrysler Corp Rotor wheel

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2988006A (en) * 1959-06-11 1961-06-13 John E Becker Fluid couplings
JPS6214199U (en) * 1985-07-10 1987-01-28
EP0609871A1 (en) * 1993-02-04 1994-08-10 PUNKER GmbH & CO. Radial blower
DE4309118C1 (en) * 1993-02-04 1994-09-01 Punker Gmbh & Co Radial fan
WO1999064746A1 (en) * 1998-06-09 1999-12-16 Escola Del Treball Del Ripolles, Fundacio Sf Rotor for fans
ES2153282A1 (en) * 1998-06-09 2001-02-16 Escola Del Trebal Del Ripolles Rotor for fans

Similar Documents

Publication Publication Date Title
US3211364A (en) Blower wheel
US3298444A (en) Turbine impeller assembly
US2347034A (en) Turbine bucket wheel and the like
US2632397A (en) Rotor wheel
US2628419A (en) Blower
US3921272A (en) Blower wheel and method of making the same
US2894681A (en) Centrifugal blower wheel structure
US2884187A (en) Centrifugal blower wheel
US3092393A (en) Labyrinth seals
US4040769A (en) Fan wheel
US3722309A (en) Multiple groove sheave
US2231062A (en) Centrifugal blower
US3070353A (en) Shroud assembly
US2079473A (en) Nozzle diaphragm and the like and method of making the same
US3262637A (en) Individual blade mountings in a blower wheel
US2470966A (en) Rotor
US2431647A (en) Centrifugal fan
US3107897A (en) Gas turbine nozzle and vane assembly
US2833464A (en) Strip formed blower wheel
US3358913A (en) Multi-section blower wheel
US2915239A (en) Blower
US3659959A (en) Air fan impeller blade assembly
US2632396A (en) Rotor wheel
US2852182A (en) Blower
US2293512A (en) Rotary impeller