WO2018033810A1 - Tête de pulvérisation à couverture uniforme - Google Patents

Tête de pulvérisation à couverture uniforme Download PDF

Info

Publication number
WO2018033810A1
WO2018033810A1 PCT/IB2017/054325 IB2017054325W WO2018033810A1 WO 2018033810 A1 WO2018033810 A1 WO 2018033810A1 IB 2017054325 W IB2017054325 W IB 2017054325W WO 2018033810 A1 WO2018033810 A1 WO 2018033810A1
Authority
WO
WIPO (PCT)
Prior art keywords
deflector
spray head
hub
spray
motor
Prior art date
Application number
PCT/IB2017/054325
Other languages
English (en)
Inventor
Jamal Daas
Original Assignee
Safepack Products Ltd.
Upl Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Safepack Products Ltd., Upl Limited filed Critical Safepack Products Ltd.
Publication of WO2018033810A1 publication Critical patent/WO2018033810A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B7/00—Preservation or chemical ripening of fruit or vegetables
    • A23B7/16—Coating with a protective layer; Compositions or apparatus therefor
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23N—MACHINES OR APPARATUS FOR TREATING HARVESTED FRUIT, VEGETABLES OR FLOWER BULBS IN BULK, NOT OTHERWISE PROVIDED FOR; PEELING VEGETABLES OR FRUIT IN BULK; APPARATUS FOR PREPARING ANIMAL FEEDING- STUFFS
    • A23N15/00—Machines or apparatus for other treatment of fruits or vegetables for human purposes; Machines or apparatus for topping or skinning flower bulbs
    • A23N15/06—Devices for other treatment of fruit, e.g. marking, maturing, polishing
    • 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
    • B05B3/08—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements in association with stationary outlet or deflecting elements
    • B05B3/082—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements in association with stationary outlet or deflecting elements the spraying being effected by centrifugal forces
    • 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
    • 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
    • B05B3/105—Fan or ventilator arrangements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/0081—Apparatus supplied with low pressure gas, e.g. "hvlp"-guns; air supplied by a fan

Definitions

  • This invention relates to spray heads or atomizers, particularly for use in fruit packing machinery.
  • Spray heads are well-known and are used in many applications to spray fine droplets of a desired material in the form of a mist
  • it is known to coat fruits with a thin coating of wax prior to packing and storage.
  • the wax gives a glossy look to the fruit and makes it look more appealing.
  • the wax coating may also include pesticides, which help prevent insect damage to the fruit during both storage and transport.
  • the type and quantity of pesticide are dictated by the duration for which the fruit is to be stored prior to transportation and the destination, which determines both the duration of the voyage and also local standards, which may prohibit some pesticides and favor others.
  • the presence of pesticides and other chemicals in the wax render uniform coating of the wax essential in order to limit the amount of pesticide to a safe level.
  • US Patent No. 6,148,989 discloses a fruit polishing machine for individually conveying and rotati ng fruits within individual cavities for each fruit
  • the device includes a continuous conveyor equipped with a repetitive series of axial ly mounted rotating brushes that are shaped to receive the individual pieces. It is also known to employ generally cylindrical brushes that are rotated axially and which are shaped so that when viewed in elevation, the outer contour is wave-like. In such an arrangement, the rotati ng brushes cause the fruit to spi n so that as the fruit passes al ong the conveyor belt between an array of brushes, the whole surface of the fruit makes contact with the brushes and is coated uniformly thereby.
  • the wax is directed to the brushes by an array of spray heads that are arranged to spray the wax uniformly to the brushes.
  • a fan is located downstream of brushes to dry the wax pri or to the fruit bei ng packaged. T he fan plays no part i n the sprayi ng, this being achieved only by the spray heads, each of which sprays in a generally conical formation having a hollow center.
  • the spray heads are spaced apart from each other by a distance that ensures that the sprays from adjacent spray heads are mutually overlapping whereby the voids are filled and spray uniformity is achieved.
  • the need for overlap between the sprays mandates multiple spray heads to coat the complete surface area within the outer contour described by a single spray head. In effect this almost duplicates the number of spray heads that could be employed if there were no void.
  • US Patent No. 4,795,095 discloses a rotary atomizer having a general ly circular integrated fan/cone assembly coupled to a hydraulic motor to effect the rotation thereof. Fluid is introduced onto an upper center hub of the cone and flows downward through apertures therein onto an upper, inner smooth portion of the cone and then into the spaced radial grooves therein to exit the cone via teeth on a lower peripheral edge thereof. The fluid is thus formed into small uniform droplets in a relatively turbulence- free zone with the thus formed droplets then directed outwardly into the radial airflow generated above the cone by the curvilinear fan blades for dispersal of the droplets in a generally circular pattern.
  • a plurality of like atomizers are positioned in a spaced manner upon and along the length a spray boom
  • the radially outward displaced droplets from adjacent rotary atomizers are distributed in an overlapping manner to provide a conti nuous, uniform distribution of the droplets over the sprayed area.
  • the droplets from one rotary atomizer thus encounter the air flow from an immediately adjacent atomizer to further agitate the droplets and improve the uniformity of distribution of the droplets.
  • F ig. 1 is a front elevation of a spray head according to an embodiment of the invention.
  • F ig. 2 is a perspective view of the spray head showing its i nternal design
  • F ig. 3 is an exploded view of the spray head
  • F ig. 4 is a partial section showing further details of the spray head including a fan and peripheral deflector;
  • F ig. 5 shows a further detail of the peripheral deflector and outlet nozzles
  • F ig. 6 shows an enlarged detail of the i nternal deflector
  • F ig. 7 shows the deflector separated from the hub
  • F ig. 8 is a partial section of the spray head showing a detail of the liquid inlets and thei r f I ui d coupl i ng to the peri pheral def I ector;
  • F ig. 10 shows schemati cal ly the effect of the fan to render the spray uniform
  • F ig. 11 is a pictorial representation of the fan blades
  • F igs. 12a to 12d are different elevations of the fan blades showing dimensions.
  • a spray head 10 comprising a hub 11 supporting a downwardly tapered skirt 12 having an inner surface 13 of circular cross- section.
  • a tapered deflector 14 of circular cross-section is coupled to a motor 16 shown schematically in Fig. 8 for rotation at high speed within the inner surface of the tapered skirt 12.
  • the motor accommodated inside the hub may be electrically or hydraulically operated.
  • a plurality of nozzles 15 are disposed in the deflector 14 and are configured to direct material toward an inner surface of the deflector 14.
  • the deflector 14 comprises a plurality of mutually abutting V-shaped ridges 17 that break the material into droplets that are deflected radially outwards as a spray cloud.
  • the deflector 14 is coaxial with the skirt 12 but of smaller diameter and is supported by the hub 11 so as to leave a radial gap 18 between an outer surface of the def I ector 14 and an i nner surface of the ski it
  • a fan 20 which may be an axial fan projects downward from and is attached to the deflector 14 and has fan blades 21 that are configured to rotate with the deflector 14 beneath an outer rim 23 of the tapered skirt 12. This generates suction that draws droplets deflected radially outwards by the deflector 14 back toward an axial center 24 of the spray head 10.
  • the central void that is characteristic of hitherto- proposed atomizers is avoided and the spray head 10 sprays a uniform spray over its complete area of coverage. This avoids the need to mount pairs of laterally spray heads in overlapping relationship as discussed above.
  • Wax material in the form of a fairly viscous liquid is injected into at least one inlet 26 shown in Fig. 8 where it is deposited inside a hollow chamber 27.
  • the hub 11 includes a hollow bore 25 through which ambient air is sucked by the fan 20 thereby assisting in forcing the wax material through the nozzl es 15 for creati ng the spray.
  • the deflector 14 includes an annular cap 30 that supports a plurality of angularly spaced apart nozzles 15 that are configured to direct the wax material toward the deflector 14.
  • the tapered deflector 14 has an apex angle of approximately 80 ⁇ and rotates at a speed of between 1,500-5,000 rp Wax emerging from the nozzles is urged substantially horizontally against the inner wall of the deflector by centrifugal force and the droplets thereby created are deflected outwards in a direction parallel to the i nner wal I surfaces of the def I ector.
  • the hub 11 includes two fluid inlets 26 each aligned with a respective pair of nozzles 15 for feeding different liquids thereto, thereby spraying a homogenous mixture of the two liquids.
  • Each of the fluid inlets 26 includes a tubular portion that extends through the hub and intersects an internal lower ri m of the hub to form an opening 34 best seen in Figs. 3 and 7, each of which is aligned with a respective nozzle 15.
  • a spacer element 35 shown in Figs. 3 and 8 ensures that the cap 30 of the deflector 14 is slightly displaced from the hub, thus creating a small cylindrical cavity that constitutes the mixing chamber 27 (shown in Fig.
  • the fan blades 21 are mounted at the end of a tapered pillar
  • the tapered pi llar 40 having an axial bore 41 supported by the deflector 14.
  • the tapered pi llar 40 abuts and is supported by a rigid circular plate 42 have angularly spaced apertures 43 through which the nozzles 15 protrude.
  • the plate 42 abuts and is retained by the inner surface of the cap 30 of the deflector 14 so that the deflector 14 and the fan blades 21 form a composite unit
  • Fig. 9 is a sectional elevation showing angular dimensions of the deflector 14 in an embodiment of the invention reduced to practice. It is seen that the walls are inclined inward to the horizontal at angles of 52.5 ⁇ and 47.5 ⁇ . It can be shown that with such a geometry, wax emerging from the nozzles is urged substantially horizontally against the inner wall of the deflector by centrifugal force. The ridges 17 break the wax into small droplets which are deflected by the inner wall surfaces of the deflector.
  • Fig. 10 shows schematically the effect of the fan to render the spray uniform, it being seen that the fan 20 sucks air from the sides of the spray head thereby urging spray that is radially deflected by the deflector 14 towards the centerline 24, thereby f i 11 i ng the voi d and ensuri ng uniform coverage.
  • Fig. 11 is a pictorial representation of the fan blades showing that they project slightly downward from a central hub and that each blade is also axially curved.
  • Figs. 12a to 12d show dimensions in mm of the critical features of the fan blades, it being noted that the diameter of the tapered skirt 12 at its lower rim is 141.30 mm This means that its radius is slightly larger than 70 mm, while the axial length of the fan blades is slightly larger than 55 mm This leaves an annular space surrounding the fan of approximately 15 mm width into which, as is seen in Fig. 9, air flow is fairly unaffected.
  • the fan serves to divert air from outside the peri phery of the tapered skirt 12 into the inner volume of revolution defined by the rotating fan blades, thereby diverting some of the spray that would otherwise be directed radially outwards towards the center.
  • Fig. 12c shows that the angle of the main part of the blade at the point of connection with central hub is equal to 36.17 ⁇ .
  • the angle between the blade and a line normal to the axis of rotation is shown as 12.16 ⁇ . Consequently the angle of the blade relative to the axis of rotation is 102.16 ⁇ (i.e. 90 ⁇ + 12.16 ⁇ ) in order to induce airflow to turn to the center.
  • Fig. 12d shows that the angle of the main part of the blade from the vertical to 5mm from the end of the blade is 7.39 ⁇ . T he last 5 mm at the end of the blade is straight to achieve stability and avoid vibrations. The curvature of the blade is designed to prevent fatigue and cavitation.
  • the propeller diameter is larger than that of the def I ector so as to cause the ai r at the si des to turn i nwards to the center.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Nozzles (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

L'invention concerne une tête de pulvérisation, comprenant un moyeu, un déflecteur conique, une pluralité de buses disposées dans le déflecteur, et un ventilateur dépassant vers le bas du déflecteur et supporté par celui-ci.
PCT/IB2017/054325 2016-08-18 2017-07-18 Tête de pulvérisation à couverture uniforme WO2018033810A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL247361 2016-08-18
IL247361A IL247361A0 (en) 2016-08-18 2016-08-18 Spray head with uniform coverage

Publications (1)

Publication Number Publication Date
WO2018033810A1 true WO2018033810A1 (fr) 2018-02-22

Family

ID=57612811

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2017/054325 WO2018033810A1 (fr) 2016-08-18 2017-07-18 Tête de pulvérisation à couverture uniforme

Country Status (3)

Country Link
AR (1) AR109337A1 (fr)
IL (1) IL247361A0 (fr)
WO (1) WO2018033810A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112044612A (zh) * 2020-09-11 2020-12-08 上海志勤环境技术有限公司 一种恒温恒湿箱的自动加湿装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1307878A (en) * 1969-06-30 1973-02-21 Mueller Ernst Kg Electrostatic paint spraying
GB2150047A (en) * 1983-11-26 1985-06-26 Microcide Limited Spray device
US4562958A (en) * 1981-03-05 1986-01-07 Mantis Ulv-Spruehgeraete Gmbh Method and device for spraying a liquid or a suspension

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1307878A (en) * 1969-06-30 1973-02-21 Mueller Ernst Kg Electrostatic paint spraying
US4562958A (en) * 1981-03-05 1986-01-07 Mantis Ulv-Spruehgeraete Gmbh Method and device for spraying a liquid or a suspension
GB2150047A (en) * 1983-11-26 1985-06-26 Microcide Limited Spray device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112044612A (zh) * 2020-09-11 2020-12-08 上海志勤环境技术有限公司 一种恒温恒湿箱的自动加湿装置

Also Published As

Publication number Publication date
IL247361A0 (en) 2016-12-29
AR109337A1 (es) 2018-11-21

Similar Documents

Publication Publication Date Title
KR101688936B1 (ko) 회전식 스프레이 장치 및 회전식 스프레이 장치를 이용하는 코팅 제품의 스프레이 방법
KR101721118B1 (ko) 코팅 재료를 살포하기 위한 부재 및 프로젝터, 그리고 그러한 살포기를 이용한 살포 방법
US2986338A (en) Spray coating applicator
KR101577995B1 (ko) 차량부품 코팅용 회전 분무기의 벨 컵, 그를 갖춘 회전 분무기 및 그의 작동방법
JP2928368B2 (ja) 回転噴霧部材を有する塗膜生成物噴霧装置
EP0357744B1 (fr) Appareil de pulverisation centrifuge a flux d'air cyclonique
CN107297288B (zh) 用于分配加压流体的系统的喷嘴及包括该喷嘴的分配系统
PT1480756E (pt) Dispositivo de pulverização de produto de revestimento líquido
WO2018033810A1 (fr) Tête de pulvérisation à couverture uniforme
WO2016195044A1 (fr) Dispositif de peinture
US4743456A (en) Apparatus and method for applying a uniform coating to food
JPH07256162A (ja) 発泡器ノズル
US3199786A (en) Nozzle for liquid spraying device
CN101939113A (zh) 喷涂装置
JP2022509414A (ja) コーティング製品を噴霧するためのボウル、そのようなボウルを含む回転噴霧装置、およびそのような噴霧装置を洗浄するための方法
JP2000504990A (ja) 農業用その他のためのスプレイ装置および方法
CN111264500A (zh) 园林施肥打药装置
EP2729239B1 (fr) Machine mélangeuse et procédé de mélange
CN115400893A (zh) 旋转钟形雾化器成形空气配置和空气帽装置
US4222523A (en) Turbine driven rotary atomizer and method of use
WO2017015708A1 (fr) Ensemble ventilateur
US20230001434A1 (en) Coating liquid mixing device, and coating liquid mixing method
JP5191239B2 (ja) 噴霧装置
FR2507104A1 (fr) Appareil pulverisateur de liquide
KR810001969B1 (ko) 회전 분무기

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17841154

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17841154

Country of ref document: EP

Kind code of ref document: A1