US3861824A - Device for regulating medium flow, in particular the flow of air of a radial fan - Google Patents

Device for regulating medium flow, in particular the flow of air of a radial fan Download PDF

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Publication number
US3861824A
US3861824A US332263A US33226373A US3861824A US 3861824 A US3861824 A US 3861824A US 332263 A US332263 A US 332263A US 33226373 A US33226373 A US 33226373A US 3861824 A US3861824 A US 3861824A
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US
United States
Prior art keywords
blades
wheel
length
inlet
flow
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
US332263A
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English (en)
Inventor
Lennart Sjoqvist
Stig Lidbamn
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.)
Svenska Flaktfabriken AB
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Svenska Flaktfabriken AB
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Publication date
Application filed by Svenska Flaktfabriken AB filed Critical Svenska Flaktfabriken AB
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Publication of US3861824A publication Critical patent/US3861824A/en
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Expired - Lifetime legal-status Critical Current

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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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/462—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps
    • F04D29/464—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps adjusting flow cross-section, otherwise than by using adjustable stator 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
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/003—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by throttling
    • 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
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/51—Inlet

Definitions

  • the device consists of a cylindrical tubular member bearing against the inward radial edges of the blades and rotating therewith.
  • the member extends axially of the blades to impede the outward flow along the blades between the inner and outer axial ends of the member.
  • the regulation is effected by selectively positioning the outer end of the member at a point along the length of the blades.
  • the member may extend to the inner axial end of the blades and effect regulation by varying the axial length of the member, or the member may be of a fixed length and effect regulation by varying the axial position of the member.
  • the present invention refers to a device constructed for the regulation of medium flow, in particular the flow of air of radial fans.
  • radial fans are manufactured in various sizes and have parts with various dimensions. Thereby it is possible to make a rough selection which will be determined primarily by the maximum demand. The fine adjustment of the medium flow can then be made by changing-as a rule contacting-the area of intake and outlet of the fan cover or the motor output.
  • the objective of the invention is to create a regulating device in the field related above in order to eliminate said disadvantages.
  • a device for regulating medium flow in particular the flow of air of a radial fan, which consists of a body placed in the medium passage and whose sectional area is reduced, wherein this body is placed inside of or in the immediate vicinity of the device for generating medium flow, e.g. a blade wheel, and that the body is designed and placed in such a way that it reduces the active surface of said device.
  • FIG. 1 shows a regulating device installed in a radial fan, according to the invention, in a schematic, axial, diametrical section.
  • FIG. 2 shows a device similar to the prior art fans in which a regulating device is installed in the casing.
  • FIGS. 3-4 show similar views of modified regulatory devices, according to the invention.
  • FIG. 5 shows the regulating characteristic of a device, according to the invention, with a variable width as in FIGS. 1 and 3, and
  • FIG. 6 shows regulating characteristic for a device, according to the invention with a constant width and a variable position as in FIG. 4.
  • 1 denotes the cover around radial fan 2 including electric motor 3, which is fastened to a radial wall with rotating flange 4, which is parallel and coaxially connected to rear wall 6 of blade wheel 5.
  • 7 designates the open end of the blade wheel, i.e., inlet, and 8, the cover inlet, which is connected to the blade wheel inlet as an axial continuation of the same.
  • the electric motor housing or any appertaining transmission can gear into the blade wheel, especially as truncated cone 11, which tapers towards its inlet.
  • a regulating device for reducing air flow inserted in wheel blade 5 is a regulating device for reducing air flow.
  • This device has at least the approximate form of a ring and, according to FIG. 1, is tangent to the inner edges of blades 10, where it suitably jars against the rear wall of the wheel 6.
  • Ring 9, as seen in FIG. 1, has the length (axial extension) in relation to the blades which is required to obtain the desired regulation characteristic (FIG. 3).
  • Ring 9 having a certain length can for example be replaced by another ring 9 having a different length.
  • several rings 9 of preferably different lengths can be put together to obtain the desired length.
  • a ring 9, which corresponds to the entire length of the blade wheel can
  • Ring 9 consists preferably of a slightly flexible or hard, elastic cellular plastic.
  • the regulating device is designed as cylinder 12, which is preferably lodged axially to slide into the cover inlet 8.
  • cylinder 12 By inserting cylinder 12 into the blade wheel at different lengths, different areas of operation for the blade wheel are obtained. In this manner, i.e. with the aid of the sufficiently long cylinder 12, infinitely variable adjustment is possible.
  • FIG. 3 an alternative similar to the preceding is shown, though with internal arrangement and alignment in the opposite direction.
  • attachment is also possible at flange 4 or cone 11, or near inlet 7 in order to obtain a nonrotary model, so that expansion takes place in the direction of wall 6.
  • the operative design is the result of a unique discovery. Tests have indicated that ringshaped regulation divice 14, resembling the one shown in FIG. 1 and having a length corresponding to just a small part, e.g., between 20 percent and 50 percent, of the length of the blade wheel, can be placed in various axial positions, and, inspite of its own dimensions remaining unchanged and an unchanged total active area for the blade wheel, accounts for a variable regulation characteristic covering a relatively large scale, as is indicated in FIG. 6, which shows the regulation characteristic for the operative design seen in FIG. 4. This regulation characteristic is remarkably similar to the one shown in FIG. 5, which is based on differing lengths for the regulating device.
  • each fan can be equipped with such a device, which is provided, for example, with such a length that the greatest possible margin of regulation is obtained. Then it is possible to remove the device entirely in order to obtain a maximal air flow or set the device in the axial position corresponding to the desired regulation characteristic.
  • the regulating device in its most simple form can be manufactured at minimal cost and, nevertheless, provide maximal performance.
  • the regulated medium can be any gas, fluid or, for example, a powder-gas mixture. It is also possible to propel the fan, etc. by completely different means. In connection with the principle as illustrated in FIG. 4 it is even possible to envisage a plant regulating device which is adapted to utilize a blade wheel, for example, or something similar, which can also be opened from both sides in special cases.
  • the characteristic structure of the present invention includes a radial fan wheel mounted for rotation about an axis in a fan casing having an axial inlet.
  • the fan wheel comprises a series of generally radially disposed blades mounted on an inner radial wall and extending outwardly therefrom generally parallel to the axis whereby upon rotation of said wheel air or other medium is drawn into the casing through the inlet and is caused to flow radially outward across said blades.
  • the capacity of the fan wheel is adjusted by disposing a cylindrical tubular element bearing against the inward radial edges of the blades and rotating therewith.
  • the member is of lesser axial length than the blades and the capacity of the fan is regulated by selectively positioning the outer end of the member at a point along the length of the blades, the greater distance from the inner radial wall of the wheel the smaller the flow generated by the wheel.
  • the axial length of this cylindrical member is preselected to cause the inner end of the axial member to abut the inner wall of the wheel to predetermine the capacity of the fan.
  • the tubular member is telescopically extendable to adjust the axial length of the tubular member to permit variation in the capacity by varying the axial length.
  • a tubular member is of fixed length and is slidable axially to adjust the capacity in accordance with the spacing of the member from the inner wall.
  • the blade wheel has a truncated conical projection projecting from the inner wall toward the inlet within the series of blades.
  • the conical projection is adapted to house transmission mechanism for rotating the blade wheel on its axis at a predetermined speed.
  • a fine adjustment of the capacity of the fan wheel may be accomplished with the use of a standard assembly of wheel parts including the inner wall, the blades, the casing, etc., the adjustment of the capacity being accomplished by selectively positioning the outer axial end of the tubular member at a point along the length of the blades.
  • a device for regulating medium flow comprising a casing having a fan wheel mounted therein for rotation about a central axis, said casing having an axial inlet for the medium, said fan wheel having a radial inner wall confronting said inlet and mounting a circle of gener- Y ally radially disposed blades extending axially from said wall toward said inlet in surrounding relation thereto, whereby upon rotation of said wheel, said blades effect flow of the medium through said inlet and radially outward across said blades, said blades having inner radial edges disposed in an imaginary cylindrical surface coaxial with said fan axis, andmeans for regulating the flow capacity of said wheel comprising a substantially cylindrical hollow tubular elastic ring member having an axial length less than the axial length of said blades and mounted for rotation with said fan wheel.
  • a device wherein said cylindrical tubular member comprises a series of telescoping rings to afford adjustment of the position of the outer axial end of said tubular member.
  • a device according to claim 1 wherein said cylindrical tubular member has an inner axial end spaced from said inner radial wall to provide a complementary limited flow area between the inner end of said member and said radial wall.
  • a device according to claim 4 wherein said ring has an axial length between 20 percent and 50 percent of the length of the blades and is slidable axially of said wheel to assume various positions to change the regulating characteristics.
  • tubular member consists of a slightly flexible or hard elastic cellular plastic.
  • a device according to claim 1 wherein said blade wheel has on its inner radial wall an outwardly projecting truncated cone tapering toward the inlet of the casing for cooperating with said cylindrical tubular member to regulate the capacity of the device.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US332263A 1972-02-25 1973-02-14 Device for regulating medium flow, in particular the flow of air of a radial fan Expired - Lifetime US3861824A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE02335/72A SE361710B (fr) 1972-02-25 1972-02-25

Publications (1)

Publication Number Publication Date
US3861824A true US3861824A (en) 1975-01-21

Family

ID=20259778

Family Applications (1)

Application Number Title Priority Date Filing Date
US332263A Expired - Lifetime US3861824A (en) 1972-02-25 1973-02-14 Device for regulating medium flow, in particular the flow of air of a radial fan

Country Status (11)

Country Link
US (1) US3861824A (fr)
AU (1) AU469344B2 (fr)
BE (1) BE795886A (fr)
DE (1) DE2307329C3 (fr)
DK (1) DK138515B (fr)
FI (1) FI56058C (fr)
FR (1) FR2173573A5 (fr)
GB (1) GB1421573A (fr)
IT (1) IT979366B (fr)
NO (1) NO142822C (fr)
SE (1) SE361710B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4859140A (en) * 1985-01-25 1989-08-22 Brod & Mcclung - Pace Co. Centrifugal fan
US5161941A (en) * 1990-08-28 1992-11-10 Sinko Kogyo, Co, Ltd. Actuator assembly for controlling inlet air flow to centrifugal fans
US5392846A (en) * 1992-11-09 1995-02-28 Gardner; Ernest A. Heat/cooling system and apparatus
US5827044A (en) * 1997-03-26 1998-10-27 Yazici; Muammer Fan system with variable air volume control

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1053154A (en) * 1912-02-20 1913-02-18 Creamery Package Mfg Co Centrifugal fan.
US1556771A (en) * 1923-07-13 1925-10-13 Benjamin F Dupont Root cutter
US1834959A (en) * 1929-02-14 1931-12-08 Comb Eer Inc Blower
US1846379A (en) * 1929-03-29 1932-02-23 American Blower Corp Apparatus and method of controlling fans
US2078580A (en) * 1936-04-10 1937-04-27 Loyal C Moore Smoke exhauster
US2430225A (en) * 1944-11-18 1947-11-04 Nat Southern Products Corp Ventilating unit
US2542121A (en) * 1947-09-09 1951-02-20 Eureka Williams Corp Motor compressor unit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE364732C (de) * 1922-01-24 1922-12-01 Oskar Florian Regelung fuer Kreiselgeblaese
DE1106918B (de) * 1955-01-19 1961-05-18 Bruno Eck Dr Ing Radialgeblaeselaeufer
FR1435094A (fr) * 1965-03-02 1966-04-15 Perfectionnements apportés aux ventilateurs ou pompes centrifuges à débit réglable
DE1628369B1 (de) * 1967-10-25 1971-02-04 Rheinstahl Henschel Ag Radiallüfter oder -pumpe mit zwei oder mehreren Schaufelkränzen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1053154A (en) * 1912-02-20 1913-02-18 Creamery Package Mfg Co Centrifugal fan.
US1556771A (en) * 1923-07-13 1925-10-13 Benjamin F Dupont Root cutter
US1834959A (en) * 1929-02-14 1931-12-08 Comb Eer Inc Blower
US1846379A (en) * 1929-03-29 1932-02-23 American Blower Corp Apparatus and method of controlling fans
US2078580A (en) * 1936-04-10 1937-04-27 Loyal C Moore Smoke exhauster
US2430225A (en) * 1944-11-18 1947-11-04 Nat Southern Products Corp Ventilating unit
US2542121A (en) * 1947-09-09 1951-02-20 Eureka Williams Corp Motor compressor unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4859140A (en) * 1985-01-25 1989-08-22 Brod & Mcclung - Pace Co. Centrifugal fan
US5161941A (en) * 1990-08-28 1992-11-10 Sinko Kogyo, Co, Ltd. Actuator assembly for controlling inlet air flow to centrifugal fans
US5392846A (en) * 1992-11-09 1995-02-28 Gardner; Ernest A. Heat/cooling system and apparatus
US5827044A (en) * 1997-03-26 1998-10-27 Yazici; Muammer Fan system with variable air volume control

Also Published As

Publication number Publication date
DE2307329A1 (de) 1973-09-06
SE361710B (fr) 1973-11-12
AU5221273A (en) 1974-08-15
NO142822C (no) 1980-10-22
BE795886A (fr) 1973-06-18
AU469344B2 (en) 1976-02-12
FI56058B (fi) 1979-07-31
DE2307329B2 (fr) 1980-09-04
DE2307329C3 (de) 1981-06-11
FR2173573A5 (fr) 1973-10-05
GB1421573A (en) 1976-01-21
FI56058C (fi) 1979-11-12
DK138515C (fr) 1979-02-26
DK138515B (da) 1978-09-18
NO142822B (no) 1980-07-14
IT979366B (it) 1974-09-30

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