US3716193A - Liquid distributor for feeding liquid to a rotating atomizer - Google Patents

Liquid distributor for feeding liquid to a rotating atomizer Download PDF

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US3716193A
US3716193A US00141560A US3716193DA US3716193A US 3716193 A US3716193 A US 3716193A US 00141560 A US00141560 A US 00141560A US 3716193D A US3716193D A US 3716193DA US 3716193 A US3716193 A US 3716193A
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wheel
liquid
atomizer
ducts
helical
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US00141560A
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K Masters
O Straarup
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GEA Process Engineering AS
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Niro Atomizer AS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B05B3/1007—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces characterised by the rotating member
    • B05B3/1021—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces characterised by the rotating member with individual passages at its periphery

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  • the distributor consists of a body mounted coaxially with the atomizer wheel, said body being provided with a number of helical ducts, the helical axis of which coincide with the axis of the atomizer wheel and terminate in an annular conduit which is coaxial with the atomizer wheel and terminates with an ejecting edge inside the wheel.
  • the helical ducts impart a rotating motion in direction of atomizer wheel rotation to the liquid which is finally flung out from the ejecting edge against the sidewall of the cup-shaped wheel.
  • LIQUID DISTRIBUTOR FOR FEEDING LIQUID TO A ROTATING ATOMIZER This invention relates to a liquid distributor for feeding liquid to a rotating atomizer wheel of the type which consists of a cup-shaped wheel, in the side wall of which a plurality of ejection apertures or ducts are provided uniformly distributed along the circumference, in addition to which the liquid distributor is adapted to impart a rotating motion to the liquid in the direction of atomizer wheel rotation.
  • the known liquid distributors which are adapted to impart a rotating motion to the liquid while this is being fed to the atomizer wheel, are employed in connection with atomizer wheels of the type shaped like a rather flat plate and from which the liquid is hurled out over the edge.
  • the purpose of imparting a rotating motion to the liquid is to obtain a uniform distribution of the liquid over the entire wheel surface so that the film of liquid along the whole circumference is, essentially, of the same thickness.
  • the distributor according to the invention is constructed in such a way that it consists of a body having a plurality of helical ducts mounted coaxially with the atomizer wheel, the helical axis of which coincide with the axis of the atomizer wheel and terminate in an. annular conduit that is coaxial with the atomizer wheel and terminates with an ejecting edge inside said wheel.
  • the splashing and spattering is obviated, which frequently occurswhen the liquid, when fed to the wheel, strikes its bottom, which can give rise to harmful deposits on the stationary parts of the atomizer.
  • FIG. 1 is a longitudinal cross-sectional view of the distributor assembly showing the relative positions of helical ducts with an atomizer wheel and a liquid distributor in one embodiment of the invention
  • FIG. 2 is a partial longitudinal sectional view of the liquid distributor part of the assembly of FIG. 1,
  • FIG. 3 is a top view of the distributor part taken along lines 3-3 of FIG. 2,
  • FIG. 4 is a longitudinal cross-sectional view of an internal part of the liquid distributor assembly used in combination with the distributor part of FIG. 2, as shown in FIG. 1,
  • FIG. 5 is a top view of the internal liquid distributor part taken along the line 5-5 of FIG. 4, and
  • FIG. 6 is a partial side view of the internal part of the liquid distributor taken along line 6-6 of FIG. 5, showing the configurations of the helical grooves formed therein.
  • FIG. 1 shows a part of an atomizer assembly 1 with an atomizer wheel 2 mounted on a shaft 3 and having ejection ducts 4.
  • the liquid or dispersion which is to be fed to the wheel 2 is supplied via a conduit 5 surrounding shaft 3 coaxially to a distributor assembly likewise surrounding the shaft having ducts 6 and consisting of an outer part 7 and an inner assembly that is divided into two parts 8 and 9.
  • the parts 7 and 8 are seen in detail in FIGS. 2-5.
  • the outer part 7 has an internal, cylindrical surface 10 along a portion of the length.
  • the axial extension of the surface 10 corresponds to the axial length of part 8, which has a corresponding external, cylindrical surface ll.
  • a plurality of helical grooves 12 have been machined, the configuration of which is seen in greater detail in FIG. 6.
  • the ducts 6 shown in FIG. 1 are produced by means of the helical grooves 12 in part 8 and the surrounding internal, cylindrical surface 10 of part 7 which extend helically in the longitudinal direction.
  • part 8 has an uninterrupted, cylindrical, external surface and if part 7 has a cylindrical, internal surface with helically extending grooves formed therein. It depends entirely upon the considerations taken with respect to production whether one or the other of these designs is chosen, which considerations will have to be taken in each individual case.
  • the helical ducts 6 terminate in a conical, annular duct 17 formed between the external surface of part 9 and the internal, conical surface 13 of part 7.
  • the wall continues with a short section 14 which, in the embodiment shown, is of quite slight conicity but extends downwardly and is directed outwardly.
  • this vertex angle will first and foremost depend on the pressure at which the liquid is supplied, in that the increasing rotational speed obtained the increasing pressure renders the ejection cone increasingly flatter. At the same time, it follows therefrom that the greater a volume is supplied per unit of time, the flatter the ejection cone becomes. However, it will not be difficult with a small wheel diameter to ensure that the film of liquid strikes the wall provided with ducts proper at as low a vertex angle of the cone as 90.
  • part 9 Since it will have to be expected that the liquid, subsequent to having left the ducts 6, is essentially present on the inner surfaces of part 7, the construction of part 9 is not of decisive importance to the distribution, but serves primarily to protect the shaft and its bearings against splashes.
  • part 9 extends further forward in front of the mouth with its bottom edge 16 than the ejecting edge 15 on part 7.
  • the inner surface 13 does not necessarily have to be conical as shown in the drawing, but may possibly be cylindrical or conical with a lower conicity. Furthermore, it is possible for the conical surface 14 to be replaced by a cylindrical surface or, possibly, with a surface forming an uninterrupted continuation of surface l3.
  • a liquid distributor for feeding liquid to a rotating atomizer wheel said wheel being cup-shaped with a central hub mounted on a vertically positioned shaft, said shaft being connected with means for rotating the wheel, a number of ejection apertures being provided in the sidewall of said cup-shaped wheel uniformly distributed along the circumference thereof, the distributor comprising a body mounted coaxially with the atomizer wheel, said body having a plurality of helical ducts the helical axis of said ducts coinciding with the axis of said atomizer wheel, and terminating in an annular conduit that is coaxial with the atomizer wheel and terminates with an ejecting edge inside said wheel.
  • a liquid distributor as claimed in claim 1, said body comprising a tubular portion surrounding said shaft of said wheel and having an internal, cylindrical surface over a section corresponding to the axial tension of said helical ducts, an annular sleeve being inserted in said portion, said sleeve being provided with an internal cylindrical surface fitting closely to said internal cylindrical surface, said helical ducts being provided in the shape of helical milled-out tracks in one of said cylindrical surfaces.
  • a liquid dlstri utor as claimed in claim 3 in which the annular conduit on the last section towards the ejecting edge has a slight opposing conicity.
  • a liquid distributor as claimed in claim 1 in which the mouth ofthe annular conduit has an internal limitation projecting further forward in direction of the outflow than the external limitation constituting said ejecting edge.

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Abstract

A liquid distributor for feeding liquid to a rotating cup-shaped atomizer wheel, in the sidewall of which a plurality of ejection apertures of ducts are provided uniformly distributed along the circumference. The distributor consists of a body mounted coaxially with the atomizer wheel, said body being provided with a number of helical ducts, the helical axis of which coincide with the axis of the atomizer wheel and terminate in an annular conduit which is coaxial with the atomizer wheel and terminates with an ejecting edge inside the wheel. The helical ducts impart a rotating motion in direction of atomizer wheel rotation to the liquid which is finally flung out from the ejecting edge against the sidewall of the cup-shaped wheel.

Description

United States Patent [19] Masters et a1.
[ LIQUID DISTRIBUTOR FOR FEEDING LIQUID TO A ROTATING ATOMIZER [75] Inventors: Keith Masters, Skovlunde; Orla 1 Straarup, Birkerod, both of Denmark [73] Assignee: Aktieselskabet Niro Atomizer, Gladsaxevej, Soborg, Denmark [22] Filed: May 10, 1971 [21] Appl.No.: 141,560
[51] ..B05b 3/02, F23d 11/04 [58] Field of Search ..239/222, 214
[56] References Cited UNITED STATES PATENTS Pilo et al. .239/222 I [451 Feb. 3,1973
3,103,311 9/1963 Kempf ..239/222 X 3,250,473 5/1966 Hege ..239/222 2,920,830 1/1960 Ngrop et al ..239/222 Primary Exzimz'ner- Lloyd L. King AttorneySughrue, Rothwell, Mion, Zinn & Macpeak ABSTRACT A liquid distributor for feeding liquid to a rotating cup-shaped atomizer wheel, in the sidewall of which a plurality of ejection apertures of ducts are provided uniformly distributed along the circumference. The distributor consists of a body mounted coaxially with the atomizer wheel, said body being provided with a number of helical ducts, the helical axis of which coincide with the axis of the atomizer wheel and terminate in an annular conduit which is coaxial with the atomizer wheel and terminates with an ejecting edge inside the wheel. The helical ducts impart a rotating motion in direction of atomizer wheel rotation to the liquid which is finally flung out from the ejecting edge against the sidewall of the cup-shaped wheel.
5 Claims, 6 Drawing Figures PATENTEUFEBIEHHB I 3.716.193
' sumaora FIG. 2
PATENTEUFEB 13 ms 13.716 193 SHEET 30F 4 FIG. 3
PATENTEDFEH 13 m5 3.716.193
'SHEET u 0F 4 FIG. 4
LIQUID DISTRIBUTOR FOR FEEDING LIQUID TO A ROTATING ATOMIZER This invention relates to a liquid distributor for feeding liquid to a rotating atomizer wheel of the type which consists of a cup-shaped wheel, in the side wall of which a plurality of ejection apertures or ducts are provided uniformly distributed along the circumference, in addition to which the liquid distributor is adapted to impart a rotating motion to the liquid in the direction of atomizer wheel rotation.
The known liquid distributors which are adapted to impart a rotating motion to the liquid while this is being fed to the atomizer wheel, are employed in connection with atomizer wheels of the type shaped like a rather flat plate and from which the liquid is hurled out over the edge. In this case, the purpose of imparting a rotating motion to the liquid is to obtain a uniform distribution of the liquid over the entire wheel surface so that the film of liquid along the whole circumference is, essentially, of the same thickness.
With atomizer wheels having ejection apertures or ducts fitted along the circumference of the wheel and which consequently are shaped like a deep dish, a nonrotating supply of liquid is normally used on account of it being possible to operate with a larger volume of liquid in the bottom of the cup-shaped wheel, from where the liquid is forced out against the side wall and up along same and out via the ducts by means of the centrifugal force, whereby there normally exists no risk of a non-uniform distribution in the ejection ducts taking place.
However, when working with atomizer wheels of the type dealt with of relatively small diameter, and in particular when using suspensions with a very high solid matter content, difficulties do arise in achieving a satisfactory distribution and it is impossible to obviate these difficulties by utilizing a rotating motion of the liquid supplied produced by the known methods where a feed pipe has been mounted coaxially with the wheel and with a tangential supply of the liquid at the topmost end of this pipe so that the liquid is distributed along the internal surface of the pipe and hurled from its lower edge in the form of a conical film of liquid striking the bottom of the wheel.
In order to solve the problems discussed, the distributor according to the invention is constructed in such a way that it consists of a body having a plurality of helical ducts mounted coaxially with the atomizer wheel, the helical axis of which coincide with the axis of the atomizer wheel and terminate in an. annular conduit that is coaxial with the atomizer wheel and terminates with an ejecting edge inside said wheel.
It has been proven that it is possible to achieve by means of this construction that the liquid is ejected from the distributor in the form of a fairly thin film having a very flat conical shape striking the side wall of the wheel in which ejection apertures or ducts have been provided. and that a particularly uniform distribution is achieved hereby.
At the same time, it is achieved that the bottom of the wheel is not subjected to wear and tear and,
moreover, the splashing and spattering is obviated, which frequently occurswhen the liquid, when fed to the wheel, strikes its bottom, which can give rise to harmful deposits on the stationary parts of the atomizer.
In the following, the invention is explained in greater detail with reference to the drawing, in which FIG. 1 is a longitudinal cross-sectional view of the distributor assembly showing the relative positions of helical ducts with an atomizer wheel and a liquid distributor in one embodiment of the invention,
FIG. 2 is a partial longitudinal sectional view of the liquid distributor part of the assembly of FIG. 1,
FIG. 3 is a top view of the distributor part taken along lines 3-3 of FIG. 2,
FIG. 4 is a longitudinal cross-sectional view of an internal part of the liquid distributor assembly used in combination with the distributor part of FIG. 2, as shown in FIG. 1,
FIG. 5 is a top view of the internal liquid distributor part taken along the line 5-5 of FIG. 4, and
FIG. 6 is a partial side view of the internal part of the liquid distributor taken along line 6-6 of FIG. 5, showing the configurations of the helical grooves formed therein.
FIG. 1 shows a part of an atomizer assembly 1 with an atomizer wheel 2 mounted on a shaft 3 and having ejection ducts 4.
The liquid or dispersion which is to be fed to the wheel 2, is supplied via a conduit 5 surrounding shaft 3 coaxially to a distributor assembly likewise surrounding the shaft having ducts 6 and consisting of an outer part 7 and an inner assembly that is divided into two parts 8 and 9.
The parts 7 and 8 are seen in detail in FIGS. 2-5.
It is seen from FIG. 2 that the outer part 7 has an internal, cylindrical surface 10 along a portion of the length. The axial extension of the surface 10 corresponds to the axial length of part 8, which has a corresponding external, cylindrical surface ll. In the external, cylindrical surface 11 of part 8, a plurality of helical grooves 12 have been machined, the configuration of which is seen in greater detail in FIG. 6.
When part 8 is mounted in the cylindrical bore in part 7, as can be seen in FIG. 1, the ducts 6 shown in FIG. 1, are produced by means of the helical grooves 12 in part 8 and the surrounding internal, cylindrical surface 10 of part 7 which extend helically in the longitudinal direction.
It will be seen that the very same result can be obtained if part 8 has an uninterrupted, cylindrical, external surface and if part 7 has a cylindrical, internal surface with helically extending grooves formed therein. It depends entirely upon the considerations taken with respect to production whether one or the other of these designs is chosen, which considerations will have to be taken in each individual case.
The helical ducts 6 terminate in a conical, annular duct 17 formed between the external surface of part 9 and the internal, conical surface 13 of part 7.
When the liquid is forced downwards through helical ducts 6, a rotating motion is imparted to the liquid and it will consequently move rotatingly over the following surface portion of the internal wall of part 7, viz. the surface marked with 13 in FIG. 2 and which extends conically so that its radius diminishes in the direction of flow of the liquid.
Thereby an increased rotational velocity of the liquid is obtained until the lowermost edge of the wall portion 13 is reached. The wall continues with a short section 14 which, in the embodiment shown, is of quite slight conicity but extends downwardly and is directed outwardly.
This section is so short and its conicity so slight that it has no great influence on the rotational velocity. It has been proven, however, that with this shape a better ejection is achieved at the lowermost edge of the part. From this edge, the liquid is evenly distributed as a thin film that is conical with a vertex angle which may reach as much as l60-l70, or more.
For a given construction, this vertex angle will first and foremost depend on the pressure at which the liquid is supplied, in that the increasing rotational speed obtained the increasing pressure renders the ejection cone increasingly flatter. At the same time, it follows therefrom that the greater a volume is supplied per unit of time, the flatter the ejection cone becomes. However, it will not be difficult with a small wheel diameter to ensure that the film of liquid strikes the wall provided with ducts proper at as low a vertex angle of the cone as 90.
Since it will have to be expected that the liquid, subsequent to having left the ducts 6, is essentially present on the inner surfaces of part 7, the construction of part 9 is not of decisive importance to the distribution, but serves primarily to protect the shaft and its bearings against splashes.
With a view to this effect, part 9 extends further forward in front of the mouth with its bottom edge 16 than the ejecting edge 15 on part 7.
The inner surface 13 does not necessarily have to be conical as shown in the drawing, but may possibly be cylindrical or conical with a lower conicity. Furthermore, it is possible for the conical surface 14 to be replaced by a cylindrical surface or, possibly, with a surface forming an uninterrupted continuation of surface l3.
What we claim is:
l. A liquid distributor for feeding liquid to a rotating atomizer wheel, said wheel being cup-shaped with a central hub mounted on a vertically positioned shaft, said shaft being connected with means for rotating the wheel, a number of ejection apertures being provided in the sidewall of said cup-shaped wheel uniformly distributed along the circumference thereof, the distributor comprising a body mounted coaxially with the atomizer wheel, said body having a plurality of helical ducts the helical axis of said ducts coinciding with the axis of said atomizer wheel, and terminating in an annular conduit that is coaxial with the atomizer wheel and terminates with an ejecting edge inside said wheel.
2. A liquid distributor as claimed in claim 1, said body comprising a tubular portion surrounding said shaft of said wheel and having an internal, cylindrical surface over a section corresponding to the axial tension of said helical ducts, an annular sleeve being inserted in said portion, said sleeve being provided with an internal cylindrical surface fitting closely to said internal cylindrical surface, said helical ducts being provided in the shape of helical milled-out tracks in one of said cylindrical surfaces.
3. A liquid distributor as claimed in claim 1 in which said annular conduit at least on part of its extension is conical and has a diameter diminishing in the direction towardsthe ejectin edge of said conduit. I
4. A liquid dlstri utor as claimed in claim 3 in which the annular conduit on the last section towards the ejecting edge has a slight opposing conicity.
5. A liquid distributor as claimed in claim 1 in which the mouth ofthe annular conduit has an internal limitation projecting further forward in direction of the outflow than the external limitation constituting said ejecting edge.

Claims (5)

1. A liquid distributor for feeding liquid to a rotating atomizer wheel, said wheel being cup-shaped with a central hub mounted on a vertically positioned shaft, said shaft being connected with means for rotating the wheel, a number of ejection apertures being provided in the sidewall of said cup-shaped wheel uniformly distributed along the circumference thereof, the distributor comprising a body mounted coaxially with the atomizer wheel, said body having a plurality of helical ducts the helical axis of said ducts coinciding with the axis of said atomizer wheel, and terminating in an annular conduit that is coaxial with the atomizer wheel and terminates with an ejecting edge inside said wheel.
1. A liquid distributor for feeding liquid to a rotating atomizer wheel, said wheel being cup-shaped with a central hub mounted on a vertically positioned shaft, said shaft being connected with means for rotating the wheel, a number of ejection apertures being provided in the sidewall of said cup-shaped wheel uniformly distributed along the circumference thereof, the distributor comprising a body mounted coaxially with the atomizer wheel, said body having a plurality of helical ducts the helical axis of said ducts coinciding with the axis of said atomizer wheel, and terminating in an annular conduit that is coaxial with the atomizer wheel and terminates with an ejecting edge inside said wheel.
2. A liquid distributor as claimed in claim 1, said body comprising a tubular portion surrounding said shaft of said wheel and having an internal, cylindrical surface over a section corresponding to the axial tension of said helical ducts, an annular sleeve being inserted in said portion, said sleeve being provided with an internal cylindrical surface fitting closely to said internal cylindrical surface, said helical ducts being provided in the shape of helical milled-out tracks in one of said cylindrical surfaces.
3. A liquid distributor as claimed in claim 1 in which said annular conduit at least on part of its extension is conical and has a diameter diminishing in the direction towards the ejecting edge of said conduit.
4. A liquid distributor as claimed in claim 3 in which the annular conduit on the last section towards the ejecting edge has a slight opposing conicity.
US00141560A 1970-05-15 1971-05-10 Liquid distributor for feeding liquid to a rotating atomizer Expired - Lifetime US3716193A (en)

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DK251670AA DK122144B (en) 1970-05-15 1970-05-15 Liquid distributor for supplying liquid to a rotating atomizer wheel.

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US3716193A true US3716193A (en) 1973-02-13

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US (1) US3716193A (en)
JP (1) JPS5345522B1 (en)
AT (1) AT317856B (en)
BE (1) BE767191A (en)
CA (1) CA931996A (en)
CH (1) CH538888A (en)
DE (1) DE2122774C3 (en)
DK (1) DK122144B (en)
FI (1) FI53403C (en)
FR (1) FR2092178A5 (en)
GB (1) GB1331708A (en)
NL (1) NL170383C (en)
SE (1) SE365431B (en)
ZA (1) ZA713081B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2456088C1 (en) * 2011-03-15 2012-07-20 Государственное образовательное учреждение высшего профессионального образования "Кемеровский технологический институт пищевой промышленности" Sprayer intake
WO2022214171A1 (en) 2021-04-07 2022-10-13 Gea Process Engineering A/S A liquid distributor of a rotary atomizer and spray drying apparatus comprising a rotary atomizer including such a liquid distributor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2920830A (en) * 1956-12-26 1960-01-12 Niro Atomizer As Atomizer for the atomization of liquid dispersions in a reaction chamber
US3034730A (en) * 1957-09-27 1962-05-15 Pilo Means for the distribution of a liquid on rotating surfaces
US3103311A (en) * 1960-09-02 1963-09-10 Foremost Dairies Inc Centrifugal atomizer and method
US3250473A (en) * 1962-12-18 1966-05-10 Hermann Hege Atomizing method and apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2920830A (en) * 1956-12-26 1960-01-12 Niro Atomizer As Atomizer for the atomization of liquid dispersions in a reaction chamber
US3034730A (en) * 1957-09-27 1962-05-15 Pilo Means for the distribution of a liquid on rotating surfaces
US3103311A (en) * 1960-09-02 1963-09-10 Foremost Dairies Inc Centrifugal atomizer and method
US3250473A (en) * 1962-12-18 1966-05-10 Hermann Hege Atomizing method and apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2456088C1 (en) * 2011-03-15 2012-07-20 Государственное образовательное учреждение высшего профессионального образования "Кемеровский технологический институт пищевой промышленности" Sprayer intake
WO2022214171A1 (en) 2021-04-07 2022-10-13 Gea Process Engineering A/S A liquid distributor of a rotary atomizer and spray drying apparatus comprising a rotary atomizer including such a liquid distributor

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Publication number Publication date
DE2122774C3 (en) 1980-11-20
BE767191A (en) 1971-10-01
DE2122774A1 (en) 1971-11-25
FI53403B (en) 1978-01-31
SE365431B (en) 1974-03-25
ZA713081B (en) 1972-03-29
DE2122774B2 (en) 1980-03-20
DK122144B (en) 1972-01-24
FI53403C (en) 1978-05-10
NL7106323A (en) 1971-11-17
CH538888A (en) 1973-07-15
NL170383C (en) 1985-01-16
GB1331708A (en) 1973-09-26
CA931996A (en) 1973-08-14
NL170383B (en) 1982-06-01
AT317856B (en) 1974-09-25
FR2092178A5 (en) 1971-01-21
JPS5345522B1 (en) 1978-12-07

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