US2488467A - Motor-driven fan - Google Patents

Motor-driven fan Download PDF

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Publication number
US2488467A
US2488467A US773562A US77356247A US2488467A US 2488467 A US2488467 A US 2488467A US 773562 A US773562 A US 773562A US 77356247 A US77356247 A US 77356247A US 2488467 A US2488467 A US 2488467A
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Prior art keywords
nozzle
base member
cross sectional
nozzles
conduit
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Expired - Lifetime
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US773562A
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Lisio Salvatore De
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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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/403—Casings; Connections of working fluid especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
    • F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids

Definitions

  • the object of the present invention which relates to motor driven fans, is the provision/of a fan which will be noiselessin operation, will produce a uniform now of air whichlnay be regulated without changing the speed of the motor, which if used as an exhaust fan requires no louvres, and in which the moving elements are enclosed, thereby providing an element of safety not found in fans now in use.
  • Fig. 2 is a side elevation partly in section, taken on the line 2-2 of Fig. l, and
  • Fig. 3 is a horizontal section taken on the line 33 of Fig. 1.
  • an electric motor l6 which drives a blower, fan, impeller, or other suitable means I! for creating a flow of air through the conduit and to and through the nozzles.
  • each nozzle has approximately the cross sectional shape indicated, viz., an oval somewhat fiattened at its forward or discharge end terminating in an annular outlet l1, said annular outlet being disposed in a plane substantially at right angles to the axis of the conduit and having a cross sectional area small compared to the cross sectional areas of the rearward portions of the nozzle; in other words, the inner lateral walls of the nozzle converge forwardly so that the cross sectional areas of the nozzle progressively diminish from the rearward end to the outlet.
  • the reason for making the nozzles in the form shown is to increase the speed of the air iiow from the nozzle and secure an air jet having a velocity greater than that of the air flow in the conduit afforded by the tubular portion l2.
  • nozzles are all similarly directed and the cross sectional areas thereof progressively increase outwardly from the innermost nozzle.
  • the cross sectional area of the outermost nozzle which of course has the greatest circumferential length, larger than that of either of the other two the air pressure throughout the n0z z1e l5 is substantially constant, and this is true of the other nozzles.
  • the cross sectional areas of the three nozzles are so designed that the air pressures produced at the outlets of said nozzles are substantially equal, thereby assuring a uniform flow.
  • the motor may be a substantially constant speed motor, and, if so, or even in any case, the speed and magnitude of the air fiow may be regulated by the damper I8.
  • the base member and nozzles preferably are formed by die casting in the usual well known manner and the two halves may then be secured to them by bolts [9 passing through the ears 20 formed as usual on both halves of the casting, and, then, if necessary, the two parts may be welded together along the line of their junction.
  • the fan will be noiseless in operation, as the moving elements are enclosed, and this arrangement will prevent the possibility of the contact of any portion of the body with such elements.
  • An electric fan comprisin in combination, a hollow base member, a blower enclosed within said base member, an annular nozzle and means aifording a conduit between said base member and said nozzle, said nozzle having an annular outlet, said annular outlet being disposed in a plane substantially at right angles to the axis of said conduit and having a cross-sectional area small compared to the cross sectional area of the rearward portions of said nozzle.
  • An electric fan comprising in combination, a hollow base member, a blower enclosed within said base member, a plurality of concentric similarly directed annular nozzles and means affording a conduit between said base member and said nozzles, each of said nozzles having an annular outlet, each of said outlets being disposed in a plane substantially at right angles to the axis of said conduit and each having a cross sectional area small compared to the cross sectional areas of the rearward portions of its nozzle.
  • An electric fan comprising in combination, a hollow base member, a blower enclosed within said base member, a plurality of concentric similarly directed annular nozzles, the cross sectional areas of said nozzles progressively increasing outwardly from the innermost nozzle, means affording a conduit between said base member and said nozzles, each of said nozzles having an annular outlet, each of said annular outlets bein disposed in a plane substantially at right angles to the axis of said conduit and each having a cross sectional area small compared to the cross sectional areas of the rearward portions of its nozzle.
  • An electric fan comprising in combination, a hollow base member, a substantially constant speed blower enclosed within said base member, an annular nozzle, means affording a conduit between said base member and said nozzle, said nozzle having an annular outlet, said annular outlet being disposed in a plane substantially at right angles to the axis of said conduit and having a cross sectional area small compared to the cross sectional areas of the rearward portions of said nozzle, and. means for regulating the flow of air to said nozzle without changing the speed of said blower.
  • An electric fan comprising in combination, a hollow base member, a substantially constant speed blower enclosed within said base member, an annular nozzle, means affording a conduit between said base member and said nozzle, said nozzle having an annular outlet, said annular outlet being disposed in a plane substantially at right angles to the axis of said conduit and having a cross sectional area small compared to the cross sectional areas of the rearward portions of said nozzle, and means for manually varying the cross sectional area of said conduit whereby the speed and magnitude of the air flow through said conduit may be regulated without changing the speed of said blower.

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

Description

Nov. 15, 1949 5. DE U510 2,488,467
MOTOR-DRIVEN FAN Filed Sept. 12, 1947 2 Sheets-Sheet 1 JNVENTOR. SMDRL ATTOR/VE).
Nov. 15, 1949 5. DE LISIO 2,488,467
MOTOR-DRIVEN FAN Filed Sept. 12, 1947 2 Sheets-Sheet 2 M A A IN VEN TOR. 5 m 2D,; 1
A TTOR/VE y Patented Nov. 15, 1949 UNITED STATES PATENT OFFICE 2,488,465? MOTOR-DRIVEN FAN Salvatore De Lisio, Boston, Mass. 7 Application September 12, 1947, Serial No. 773,562
Claims. (Cl. 230- 274) The object of the present invention, which relates to motor driven fans, is the provision/of a fan which will be noiselessin operation, will produce a uniform now of air whichlnay be regulated without changing the speed of the motor, which if used as an exhaust fan requires no louvres, and in which the moving elements are enclosed, thereby providing an element of safety not found in fans now in use.
In the drawings accompanying and forming a part of this specification-- Figure 1 is a front elevation partly in section of a fan embodying my invention.
Fig. 2 is a side elevation partly in section, taken on the line 2-2 of Fig. l, and
Fig. 3, is a horizontal section taken on the line 33 of Fig. 1.
In the particular drawings selected for more fully disclosing my invention and the principle underlying the same, In is a hollow base member supported by legs II, the bottom of said base member being open to the atmosphere and the upper portion terminating in a tubular portion I 2 which affords a conduit between the base member and the nozzles l3, l4, [5, shown, in the present instance, as three concentric annular nozzles, although, of course, it'will be understood that my invention is not limited to the number or the shape of the nozzles.
Enclosed within the base member is an electric motor l6 which drives a blower, fan, impeller, or other suitable means I! for creating a flow of air through the conduit and to and through the nozzles.
Preferably, each nozzle has approximately the cross sectional shape indicated, viz., an oval somewhat fiattened at its forward or discharge end terminating in an annular outlet l1, said annular outlet being disposed in a plane substantially at right angles to the axis of the conduit and having a cross sectional area small compared to the cross sectional areas of the rearward portions of the nozzle; in other words, the inner lateral walls of the nozzle converge forwardly so that the cross sectional areas of the nozzle progressively diminish from the rearward end to the outlet. The reason for making the nozzles in the form shown is to increase the speed of the air iiow from the nozzle and secure an air jet having a velocity greater than that of the air flow in the conduit afforded by the tubular portion l2.
If a plurality of nozzles are employed, they are all similarly directed and the cross sectional areas thereof progressively increase outwardly from the innermost nozzle.
, 2 -By making the cross sectional area of the outermost nozzle, which of course has the greatest circumferential length, larger than that of either of the other two the air pressure throughout the n0z z1e l5 is substantially constant, and this is true of the other nozzles. Preferably, the cross sectional areas of the three nozzles are so designed that the air pressures produced at the outlets of said nozzles are substantially equal, thereby assuring a uniform flow. The motor may be a substantially constant speed motor, and, if so, or even in any case, the speed and magnitude of the air fiow may be regulated by the damper I8.
The base member and nozzles preferably are formed by die casting in the usual well known manner and the two halves may then be secured to them by bolts [9 passing through the ears 20 formed as usual on both halves of the casting, and, then, if necessary, the two parts may be welded together along the line of their junction.
As will be obvious, the fan will be noiseless in operation, as the moving elements are enclosed, and this arrangement will prevent the possibility of the contact of any portion of the body with such elements.
When my invention is used as an exhaust fan, no louvres will be required.
Having thus disclosed an illustrative embodiment of my invention, without, however, limiting the same thereto, what I claim and desire to secure by Letters Patent is:
1. An electric fan comprisin in combination, a hollow base member, a blower enclosed within said base member, an annular nozzle and means aifording a conduit between said base member and said nozzle, said nozzle having an annular outlet, said annular outlet being disposed in a plane substantially at right angles to the axis of said conduit and having a cross-sectional area small compared to the cross sectional area of the rearward portions of said nozzle.
2. An electric fan comprising in combination, a hollow base member, a blower enclosed within said base member, a plurality of concentric similarly directed annular nozzles and means affording a conduit between said base member and said nozzles, each of said nozzles having an annular outlet, each of said outlets being disposed in a plane substantially at right angles to the axis of said conduit and each having a cross sectional area small compared to the cross sectional areas of the rearward portions of its nozzle.
3. An electric fan comprising in combination, a hollow base member, a blower enclosed within said base member, a plurality of concentric similarly directed annular nozzles, the cross sectional areas of said nozzles progressively increasing outwardly from the innermost nozzle, means affording a conduit between said base member and said nozzles, each of said nozzles having an annular outlet, each of said annular outlets bein disposed in a plane substantially at right angles to the axis of said conduit and each having a cross sectional area small compared to the cross sectional areas of the rearward portions of its nozzle.
4. An electric fan comprising in combination, a hollow base member, a substantially constant speed blower enclosed within said base member, an annular nozzle, means affording a conduit between said base member and said nozzle, said nozzle having an annular outlet, said annular outlet being disposed in a plane substantially at right angles to the axis of said conduit and having a cross sectional area small compared to the cross sectional areas of the rearward portions of said nozzle, and. means for regulating the flow of air to said nozzle without changing the speed of said blower.
5. An electric fan comprising in combination, a hollow base member, a substantially constant speed blower enclosed within said base member, an annular nozzle, means affording a conduit between said base member and said nozzle, said nozzle having an annular outlet, said annular outlet being disposed in a plane substantially at right angles to the axis of said conduit and having a cross sectional area small compared to the cross sectional areas of the rearward portions of said nozzle, and means for manually varying the cross sectional area of said conduit whereby the speed and magnitude of the air flow through said conduit may be regulated without changing the speed of said blower.
SALVATORE DE LISIO.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,239,515 Peterson Sept. 11, 1917 2,135,842 Prutton Nov. 8, 1938 2,210,458 Keilholtz Aug. 6, 1940 2,435,645 Bergstrom Feb. 10, 1948
US773562A 1947-09-12 1947-09-12 Motor-driven fan Expired - Lifetime US2488467A (en)

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