US3826428A - Spraying apparatus - Google Patents
Spraying apparatus Download PDFInfo
- Publication number
- US3826428A US3826428A US00346016A US34601673A US3826428A US 3826428 A US3826428 A US 3826428A US 00346016 A US00346016 A US 00346016A US 34601673 A US34601673 A US 34601673A US 3826428 A US3826428 A US 3826428A
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- US
- United States
- Prior art keywords
- liquid
- shaft
- fan
- producing
- strips
- 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
Links
- 238000005507 spraying Methods 0.000 title description 3
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 239000006185 dispersion Substances 0.000 claims description 3
- 239000003595 mist Substances 0.000 abstract description 8
- 239000007921 spray Substances 0.000 abstract description 7
- 239000000463 material Substances 0.000 description 5
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000003905 agrochemical Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 210000003141 lower extremity Anatomy 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- 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
Definitions
- An apparatus for producing a very fine spray or mist of liquid of droplet size between 25 and 250 microns comprises a plurality of annular strips coaxially mounted with and radially supported by a rotateable shaft.
- a supply pipe which terminates within the space enclosed by the strips is capable of producing a fan jet of liquid, the longitudinal axis of symmetry of the jet being inclined to the longitudinal axis of the rotateable shaft.
- the optimum distribution of liquid on the annular strips is achieved by using a fan jet of the curled- 4 Claims, 2 Drawing Figures 1 SPRAYING APPARATUS
- the present invention relates to apparatus for producing a very fine spray or mist of a liquid.
- apparatus for producing a very fine spray or mist of liquid which apparatus comprises a plurality of annular strips coaxially mounted with and radially supported by a rotateable shaft and a supply pipe terminating within the space enclosed by the strips and having means at the end thereof to produce a fan jet of liquid, the longitudinal axis of symmetry of the jet being inclined to the longitudinal axis of the rotateable shaft.
- a very fine spray or mist of liquid is meant within the context of this specification a dispersion of liquid droplets having a droplet size between 25 and 250 microns.
- fan jets both of the highpressure or low-pressure type, may be used but it is preferred to employ a low-pressure fan jet of the curledplate type.
- the fan jet is arranged so that the jet is directed within the core of the space enclosed by the discs.
- the body of liquid impinging on the discs is fan shaped, which provides the necessary geometrical arrangement for ensuring that each disc receives an equal share of the atomising function even when the flow-rate changes, as invariably occurs with gravity feed systems.
- the feed to the discs is in the form of a narrow fan feeding only one or two discs whereas at higher flow rates the fan angle widens so that the increased flow is shared between a higher number of discs thus keeping the performance of each disc within its design capacity.
- the annular strip may be fabricated from plastics material, metal or any other suitable material though fabrication from plastics material is preferred because it offers the advantages of corrosion resistance, low weight and ease of fabrication at relatively low cost.
- the strip may be in the form of a flat disc or in the shape of the outer surface of the frustum of a cone, the latter shape being preferred.
- the apparatus will find application in agriculture, particularly where liquids are applied to crops by devices incorporating the gravity feed principle.
- FIG. 1 is a cross-sectional view of the device and FIG. 2 is a section on the line XX of FIG. 1.
- a rotateable motor shaft 1 has attached to its lower extremity a disc support plate 2.
- the shaft is attached to an electric motor but any means for producing high-speed rotation of the shaft may be used.
- the multiplicity of discs 3 are attached to the disc support plate 2 via a number of rivets 4.
- the discs are kept apart by the spacers 5.
- the discs are fabricated from plastics material but they may be constructed from metals or any other suitable material.
- the liquid is fed to the atomiser assembly via the tube 6 attached to the end of which is the curled plate 7.
- the combination of items 6 and 7 provide a low pressure fan jet.
- One design and size of the assembly 6 and 7 is capable of maintaining a fan jet pattern which has an angle of spread such thaton suitably spaced discs the number of discs being fed is substantially proportional to the feed rate.
- liquid introduced through the tube 6 impinges on the curved plate 7 producing a fan shaped film which falls on the rapidly rotating discs 3.
- the inclination of the curved plate 7 can be adjusted so that the liquid falls on the discs.
- the forces on the liquid propel it to the circumference of the discs, from which it is ejected in the form of a fine spray or mist.
- the fan of liquid produced by the curved plate describes a smaller arc and thus engages a fewer number of the rotating discs, placing an equal load on each.
- Apparatus for producing a dispersion of liquid droplets having a droplet size between 25 and 250 microns which apparatus comprises a rotatable shaft, a plurality of annular strips co-axial with and supported from said shaft for rotation therewith, said strips being spaced from each other in the axial direction of said shaft and having their inner peripheries spaced from said shaft to provide a space between said inner peripheries and said shaft, and means for producing a fanshaped jet of liquid directed outwardly from the axis of said shaft and with the plane of the fan inclined with respect to a further plane perpendicular to said axis, said means comprising a stationary liquid supply pipe extending and opening into said space and disposed to discharge and direct said liquid along a path which is inclined with respect to said further plane and a stationary curled plate mounted with the curled portion thereof in said path of said liquid and extending transversely to said path, said curled portion also extending in a direction outwardly of said axis so as to direct said liquid onto said annular strips in
- each of said annular strips is in the form of a flat disc.
- each of said annular strips is in the form of the outer surface of a frustum of a cone.
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- Nozzles (AREA)
Abstract
An apparatus for producing a very fine spray or mist of liquid of droplet size between 25 and 250 microns, comprises a plurality of annular strips coaxially mounted with and radially supported by a rotateable shaft. A supply pipe which terminates within the space enclosed by the strips is capable of producing a fan jet of liquid, the longitudinal axis of symmetry of the jet being inclined to the longitudinal axis of the rotateable shaft. The optimum distribution of liquid on the annular strips is achieved by using a fan jet of the curled-plate type.
Description
United States Patent [191 Fergusson [ll] 3,826,428 [451 July 30, 1974 SPRAYING APPARATUS [75] Inventor: Ian Douglas Fergusson, Godstone England [73] Assignee: BP Chemicals International Limited, London, England 22 Filed: Mar. 29, 1973 21 Appl. No.: 346,016
US. Cl. 239/222.1l, 239/224 {51] Int. Cl B05b 3/08 [58] Field of Search 239/22211, 222.17, 223, 239/224, 380
[56] References Cited I UNITED STATES PATENTS 3.017,]16 l/l962 Norris 239/224 X 3,l97,l43 7/1965 Norris 239/223 3,459,586. 8/l969 Kiwiet ct al 239/224 X plate type.
Norris 239/l5 Arnold et al 239/222.ll
3/1971 l2/l97l Primary Examiner-M. Henson Wood, Jr. Assistant Examiner-lohn J. Love Attorney, Agent, or Firm-Brooks Haidt & Haffner [57 ABSTRACT An apparatus for producing a very fine spray or mist of liquid of droplet size between 25 and 250 microns, comprises a plurality of annular strips coaxially mounted with and radially supported by a rotateable shaft. A supply pipe which terminates within the space enclosed by the strips is capable of producing a fan jet of liquid, the longitudinal axis of symmetry of the jet being inclined to the longitudinal axis of the rotateable shaft. The optimum distribution of liquid on the annular strips is achieved by using a fan jet of the curled- 4 Claims, 2 Drawing Figures 1 SPRAYING APPARATUS The present invention relates to apparatus for producing a very fine spray or mist of a liquid.
There are many occasions when a fine spray or mist of a liquid is required, for example agricultural chemicals are invariably applied to crops in this form. One type of apparatus currently in use for this purpose is the rotary disc atomiser which disperses a liquid in the form of a fine mist by reason of the centrifugal forces acting on a liquid fed to the surface of the disc. It is at present usual to design the system for a specific flow rate. Variations in the rate of flow from the design values result in a broadening of the spectrum of droplets produced.
An improved apparatus is now provided in which the load on individual discs is kept substantially constant over a wide range of flow variations.
Thus according to the present invention there is provided apparatus for producing a very fine spray or mist of liquid which apparatus comprises a plurality of annular strips coaxially mounted with and radially supported by a rotateable shaft and a supply pipe terminating within the space enclosed by the strips and having means at the end thereof to produce a fan jet of liquid, the longitudinal axis of symmetry of the jet being inclined to the longitudinal axis of the rotateable shaft.
By the expression a very fine spray or mist of liquid is meant within the context of this specification a dispersion of liquid droplets having a droplet size between 25 and 250 microns.
Any means for producing fan jets, both of the highpressure or low-pressure type, may be used but it is preferred to employ a low-pressure fan jet of the curledplate type. The fan jet is arranged so that the jet is directed within the core of the space enclosed by the discs. In this way the body of liquid impinging on the discs is fan shaped, which provides the necessary geometrical arrangement for ensuring that each disc receives an equal share of the atomising function even when the flow-rate changes, as invariably occurs with gravity feed systems. At low flow rates the feed to the discs is in the form of a narrow fan feeding only one or two discs whereas at higher flow rates the fan angle widens so that the increased flow is shared between a higher number of discs thus keeping the performance of each disc within its design capacity.
The annular strip may be fabricated from plastics material, metal or any other suitable material though fabrication from plastics material is preferred because it offers the advantages of corrosion resistance, low weight and ease of fabrication at relatively low cost. The strip may be in the form of a flat disc or in the shape of the outer surface of the frustum of a cone, the latter shape being preferred.
It is envisaged that the apparatus will find application in agriculture, particularly where liquids are applied to crops by devices incorporating the gravity feed principle.
A preferred embodiment of the invention will be described with reference to the drawings in which:
FIG. 1 is a cross-sectional view of the device and FIG. 2 is a section on the line XX of FIG. 1.
With reference to FIGS. 1 and 2 a rotateable motor shaft 1 has attached to its lower extremity a disc support plate 2. The shaft is attached to an electric motor but any means for producing high-speed rotation of the shaft may be used. The multiplicity of discs 3 are attached to the disc support plate 2 via a number of rivets 4. The discs are kept apart by the spacers 5. In this embodiment the discs are fabricated from plastics material but they may be constructed from metals or any other suitable material.
The liquid is fed to the atomiser assembly via the tube 6 attached to the end of which is the curled plate 7. The combination of items 6 and 7 provide a low pressure fan jet. One design and size of the assembly 6 and 7 is capable of maintaining a fan jet pattern which has an angle of spread such thaton suitably spaced discs the number of discs being fed is substantially proportional to the feed rate.
In operation liquid introduced through the tube 6 impinges on the curved plate 7 producing a fan shaped film which falls on the rapidly rotating discs 3. At the highest flow rate the inclination of the curved plate 7 can be adjusted so that the liquid falls on the discs. The forces on the liquid propel it to the circumference of the discs, from which it is ejected in the form of a fine spray or mist. As the flow rate of the liquid through the tube 6 falls the fan of liquid produced by the curved plate describes a smaller arc and thus engages a fewer number of the rotating discs, placing an equal load on each.
I claim:
1. Apparatus for producing a dispersion of liquid droplets having a droplet size between 25 and 250 microns which apparatus comprises a rotatable shaft, a plurality of annular strips co-axial with and supported from said shaft for rotation therewith, said strips being spaced from each other in the axial direction of said shaft and having their inner peripheries spaced from said shaft to provide a space between said inner peripheries and said shaft, and means for producing a fanshaped jet of liquid directed outwardly from the axis of said shaft and with the plane of the fan inclined with respect to a further plane perpendicular to said axis, said means comprising a stationary liquid supply pipe extending and opening into said space and disposed to discharge and direct said liquid along a path which is inclined with respect to said further plane and a stationary curled plate mounted with the curled portion thereof in said path of said liquid and extending transversely to said path, said curled portion also extending in a direction outwardly of said axis so as to direct said liquid onto said annular strips in a fan-shaped pattern in a plane which is inclined with respect to said further plane, whereby each strip receives a substantially equal share of the atomizing function irrespective of flow rate changes of the liquid discharged from said supply pipe.
2. Apparatus according to claim 1, wherein said means for producing a fan-shaped jet is low pressure means.
3. Apparatus according to claim 1, wherein each of said annular strips is in the form of a flat disc.
4. Apparatus according to claim 1, wherein each of said annular strips is in the form of the outer surface of a frustum of a cone.
Claims (4)
1. Apparatus for producing a dispersion of liquid droplets having a droplet size between 25 and 250 microns which apparatus comprises a rotatable shaft, a plurality of annular strips coaxial with and supported from said shaft for rotation therewith, said strips being spaced from each other in the axial direction of said shaft and having their inner peripheries spaced from said shaft to provide a space between said inner peripheries and said shaft, and means for producing a fan-shaped jet of liquid directed outwardly from the axis of said shaft and with the plane of the fan inclined with respect to a further plane perpendicular to said axis, said means comprising a stationary liquid supply pipe extending and opening into said space and disposed to discharge and direct said liquid along a path which is inclined with respect to said further plane and a stationary curled plate mounted with the curled portion thereof in said path of said liquid and extending transversely to said path, said curled portion also extending in a direction outwardly of said axis so as to direct said liquid onto said annular strips in a fan-shaped pattern in a plane which is inclined with respect to said further plane, whereby each strip receives a substantially equal share of the atomizing function irrespective of flow rate changes of the liquid discharged from said supply pipe.
2. Apparatus according to claim 1, wherein said means for producing a fan-shaped jet is low pressure means.
3. Apparatus according to claim 1, wherein each of said annular strips is in the form of a flat disc.
4. Apparatus according to claim 1, wherein each of said annular strips is in the form of the outer surface of a frustum of a cone.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00346016A US3826428A (en) | 1973-03-29 | 1973-03-29 | Spraying apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00346016A US3826428A (en) | 1973-03-29 | 1973-03-29 | Spraying apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
US3826428A true US3826428A (en) | 1974-07-30 |
Family
ID=23357573
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00346016A Expired - Lifetime US3826428A (en) | 1973-03-29 | 1973-03-29 | Spraying apparatus |
Country Status (1)
Country | Link |
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US (1) | US3826428A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4337763A (en) * | 1980-04-21 | 1982-07-06 | The United States Of America As Represented By The Department Of Health, Education And Welfare | Illuminated surgical instrument |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3017116A (en) * | 1958-07-23 | 1962-01-16 | Edward O Norris | Electrostatic spraying device |
US3197143A (en) * | 1962-10-16 | 1965-07-27 | Edward O Norris | Centrifugal atomizer with fixed fan jet feed |
US3459586A (en) * | 1965-06-02 | 1969-08-05 | Inland Steel Co | Centrifugal spray coating methods and apparatus |
US3572589A (en) * | 1968-07-31 | 1971-03-30 | Edward O Norris | Electrostatically driven distributor |
US3625430A (en) * | 1968-04-08 | 1971-12-07 | Ajem Lab Inc | Method and apparatus for cleaning contaminated gases |
-
1973
- 1973-03-29 US US00346016A patent/US3826428A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3017116A (en) * | 1958-07-23 | 1962-01-16 | Edward O Norris | Electrostatic spraying device |
US3197143A (en) * | 1962-10-16 | 1965-07-27 | Edward O Norris | Centrifugal atomizer with fixed fan jet feed |
US3459586A (en) * | 1965-06-02 | 1969-08-05 | Inland Steel Co | Centrifugal spray coating methods and apparatus |
US3625430A (en) * | 1968-04-08 | 1971-12-07 | Ajem Lab Inc | Method and apparatus for cleaning contaminated gases |
US3572589A (en) * | 1968-07-31 | 1971-03-30 | Edward O Norris | Electrostatically driven distributor |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4337763A (en) * | 1980-04-21 | 1982-07-06 | The United States Of America As Represented By The Department Of Health, Education And Welfare | Illuminated surgical instrument |
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