US3698837A - Blade angle setting device - Google Patents

Blade angle setting device Download PDF

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Publication number
US3698837A
US3698837A US52479A US3698837DA US3698837A US 3698837 A US3698837 A US 3698837A US 52479 A US52479 A US 52479A US 3698837D A US3698837D A US 3698837DA US 3698837 A US3698837 A US 3698837A
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United States
Prior art keywords
rims
pair
hub
screw
straps
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
US52479A
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English (en)
Inventor
Louis Marcellin
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Neu SA
Original Assignee
Neu Sa
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Filing date
Publication date
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Publication of US3698837A publication Critical patent/US3698837A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/34—Blade mountings
    • F04D29/36—Blade mountings adjustable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0055—Rotors with adjustable blades

Definitions

  • the rotation of said rods is obtained by means of tools engaging a radially extending shaft and connected through a swivel joint or a worm and gear drive to said rods.
  • Known devices of this type comprise as a rule mechanical assemblies having a relatively great number of parts involving a very accurate machining and a delicate assembling, such as shafts, bearings, thrust bearing, whether of the plain or rolling-contact type, driven through cams, plates, etc. It is the essential object of the present invention to provide improvements in a device of this character as described in the French Pat. No. 1,435,444 of May 21, 1965 wherein the root of each blade has a part-spherical configuration and fits between two rims of which one portion of the inner faces consists likewise of partspherical surfaces of same radius as the preceding one, the angular movements of the blades and of the rims being positively interconnected by the fact that these components comprise teeth to constitute a bevel gear assembly.
  • the two rims disposed on either side of the blade roots are assembled by means of bolts extending through elongated holes so that before tightening these bolts, or after releasing same, it is possible to set the blades in the desired angular position, the bevel gear providing the necessary simultaneous rotation of all the blades. Tightening the bolts will subsequently prevent the two rims from moving away from each other and to shift in relation to each other when the wheel rotates.
  • the blade angle of a helical wheel comprising a hub and a pair of rims clamping the blade roots of substantially part-spherical configuration, said rootsand said rims carry bevel gear teeth causing their angular movements to be positively linked, one of said rims which clamps the roots of the blades from one side of the wheel being secured to the hub thereof, the other rim which clamps the roots from the opposite side of the wheel being mounted for free rotation about said hub but held against axial movement in relation thereto, at least one screw-threaded rod being associated with pivoting straps solid with one and the other rim respectively, said rod thus interconnecting the two rims and permitting, through a rotational movement obtained by using a suitable control tool, irreversibly adjusting the relative setting of the two rims and therefore of the wheel blades, a control shaft operatively connected to said rod being disposed along one radius of said wheel.
  • FIG. 1 is an axial view of a wheel (without blades) equipped with the device of this invention, as seen from the control side of the devices;
  • FIG. 2 is a section taken along the line Il-II of FIG.
  • FIG. 3 illustrates in axial view a wheel comprising a modified form of embodiment of the device of this invention
  • FIG. 4 is a sectional view of the wheel of FIG. 3, the section being taken along the axisIV-IV thereof.
  • one of the two rims l is rigid with a hub 2 to which it is secured by means of screws In; this hub constitutes the hub of the helical bladed wheel and is adapted to be secured to a drive shaft (not shown) engaging the bore 3 of hub 2 which is tapered in the example illustrated in FIG. 2, although this shape is not compulsory.
  • the other rim 4 can revolve freely about the same hub 2 but is held against axial movement in relation thereto by engaging a member 5 which is connected to hub 2 by means 20 so that the two rims l, 4 cannot move away from each other as a consequence of the centrigugal force strongly urging the roots 6a of blades 6 against the inner faces 1b, 4b respectively of said rims.
  • one or two straps 10 adapted to pivot about an axis parallel to the wheel axisaresecured to the free rim 4.
  • the hub supporting the other rim or the member 5 integral with the hub 2 or the rim itself is provided with one or two similar straps 9.
  • a screw-threated rod 7 interconnects by pairs the strap or straps 10 mounted on the free rim 4 to strap or straps 9 mounted on the hub 2 or the member 5 integral with the hub 2 or the fixed rim 1.
  • two forms of operative connection may be provided between the rod or rods and the straps (1)
  • the device is asymmetric and comprises only two straps.
  • the rod 7 comprises a single thread 8 engaging a corresponding tapped portion of one of the two straps, e.g. strap 9.
  • the end of rod 7 is plain and revolves freely in the other strap 10 it comprises shoulders 11, 12 preventing any axial movement of the strap along this rod.
  • the rotation of the screw-threaded rod 7 is obtained by rotating a plain rod 13 extending along aradius of the bladed wheel and revolving in a plain bearing 14 carried by the free rim 4 the rotation of this rod 13 is at tended by that of the screw-threaded rod 7 through the medium of a device permitting a certain angular discrepancy, such as a double swivel joint 15.
  • the device is symmetrical as shown in FIGS. 3 and 4. It comprises four straps, i.e. two diametrically opposite straps 16, 17 on the free rim 4 and two diametrically opposite straps 18, 19 on the member 5 attached to fixed rim 1.
  • Each rod carries a pinion 22, 23 respectively, each pinion meshing with a tangent worm25, 26 these worms are secured to a common shaft 27 disposed along one diameter of the helical wheel.
  • the straps 16, 18 and rod 20 and 17, 19 on rod 21 move away from or towards each other, at the same time revolving on opposite sides with the rim 4 and with the member 5 connected to rim 1 through the hub 2, thus obliging the rods 20,
  • the ends of the diametral shaft 27, as in the preceding case, are either slotted or formed with a hexagonal portion to permit the use of a corresponding tool for turning this shaft for obtaining the desired angular blade setting.
  • the fan wheels constructed according to the teachings of this invention can be used in turbo-machines of which it is desired to vary without difficulty the pattern of the characteristic output/pressure and output/power curves, for a given velocity of rotation, during a very short stopping of he machine, without having to remove or disassemble any part.
  • This device is obviously applicable to a great number of industrial machines, since it affords an optimum setting of the air and gas outputs, according to requirements. More particularly, it permits replacing variable-speed driving mechanisms or systems.
  • a fan wheel including a device for adjusting the angular setting of all of the blades of the fan wheel while said fan wheel is not rotating comprising: a hub, a pair of rims with inner part-spherical surfaces which clamp the roots of the fan blades, fan blades having roots which have a part-spherical configuration of the same radius as the part-spherical surfaces of the rims, said roots and said rims being provided with beveled gear teeth for operatively linking the angular movement of the fan blade roots, one of said rims rigidly attached to said hub and the other said rim adapted to revolve about said hub without moving axially with respect to said hub, and an adjusting device comprising at least one pair of, pivotin straps one strap of each pair of said straps respective y connected to each of the two rims, at least one screw-threaded rod, associated with each pair of said pivoting straps, said rod adapted to operatively connect said rims, a control rod connected to said screw-thre
  • a device wherein a double swivel joint is provided between said screw-threaded rod and said control rod.
  • control rod extends substantially diametrically across the hub of the fan wheel
  • said device comprises: a pair of parallel screw-threaded rods, each of which carries a worm gear and has two screw threaded portions of opposite pitch thereon; and two pairs of pivoting straps, one strap from each pair attached to one of the pair of rims clamping the roots of the clades, said pivoting straps tapped and each pair of strips engaged by screw-threads to the threaded portions of one of said parallel rods; and toothed pinions on said control rod in constant meshing engagement with said worm gears, thereby operatively connecting said control rod and said parallel rods.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US52479A 1969-12-19 1970-07-06 Blade angle setting device Expired - Lifetime US3698837A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6944292A FR2071203A6 (it) 1969-12-19 1969-12-19

Publications (1)

Publication Number Publication Date
US3698837A true US3698837A (en) 1972-10-17

Family

ID=9044917

Family Applications (1)

Application Number Title Priority Date Filing Date
US52479A Expired - Lifetime US3698837A (en) 1969-12-19 1970-07-06 Blade angle setting device

Country Status (3)

Country Link
US (1) US3698837A (it)
JP (1) JPS5031282B1 (it)
FR (1) FR2071203A6 (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003677A (en) * 1973-05-07 1977-01-18 Wilmot Breeden (Truflo) Limited Fan assembly with blades secured between two hub members
US4474534A (en) * 1982-05-17 1984-10-02 General Dynamics Corp. Axial flow fan
US5826822A (en) * 1996-04-19 1998-10-27 Rehm; Rehm N. System and method for providing cyclic and collective pitch control in a rotary wing aircraft

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003677A (en) * 1973-05-07 1977-01-18 Wilmot Breeden (Truflo) Limited Fan assembly with blades secured between two hub members
US4474534A (en) * 1982-05-17 1984-10-02 General Dynamics Corp. Axial flow fan
US5826822A (en) * 1996-04-19 1998-10-27 Rehm; Rehm N. System and method for providing cyclic and collective pitch control in a rotary wing aircraft

Also Published As

Publication number Publication date
FR2071203A6 (it) 1971-09-17
JPS5031282B1 (it) 1975-10-09

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