US3401883A - Spray pistol - Google Patents

Spray pistol Download PDF

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Publication number
US3401883A
US3401883A US574345A US57434566A US3401883A US 3401883 A US3401883 A US 3401883A US 574345 A US574345 A US 574345A US 57434566 A US57434566 A US 57434566A US 3401883 A US3401883 A US 3401883A
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US
United States
Prior art keywords
spraying
nozzle
sprayed
pipe
compressed air
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
US574345A
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English (en)
Inventor
Gebhardt Otto
Luderer Manfred
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
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Publication of US3401883A publication Critical patent/US3401883A/en
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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
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • 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
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • 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
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0853—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with one single gas jet and several jets constituted by a liquid or a mixture containing a liquid
    • 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
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/10—Spray pistols; Apparatus for discharge producing a swirling discharge

Definitions

  • the invention relates to spray pistols operated by compressed air for the production of coatings of extremely finely devided liquid and/or solid substances by Spraying with electrostatic charging of the sprayed material.
  • Very many spray pistols are known in which the atomisation of the sprayed material and the guiding of the atomised sprayed material to the workpiece which is to be coated is eifected by compressed air.
  • An essential disadvantage of all these compressed air pistols is however a relatively high consumption of sprayed material, since according to the shape of the workpiece, always a more or less large quantity of said material misses the workpiece and is thus lost without serving any useful purpose.
  • spray pistols are also known which operate purely electrostatically. With these spray pistols, the consumption of sprayed material is substantially smaller on account of the said material being attracted by the workpiece and in addiiion an embracing of the workpiece with the sprayed material is obtained.
  • the electrostatic spraying method cannot be used in all cases. For example, it is impossible for the interior of a narrow container or vessel to be sprayed by purely electrostatic means, since in this case the charged droplets of sprayed material are already so strongly attracted by the rim of the container that only a small fraction of the sprayed material reaches the interior of the container. Consequently, attempts have also frequently been made to provide combination pistols which operate with both compressed air and with electrostatic charging. The most obvious procedure consists in applying high voltage to the spraying nozzle of a conventional compressed air pistol, that is to say, to use the spraying nozzle simultaneously as a spraying electrode.
  • the noz zle for the sprayed material generally consist of a nozzle tube which is connected to a supply device for the sprayed material and a high voltage generator, said tube being surrounded concentrically by a compressed air nozzle formed as an annular gap.
  • a reduced pressure zone is set up directly in front of the spraying nozzle, whereby a satisfactory spraying becomes impossible.
  • the invention now has for its object to provide a compressed air pisfol with a spraying nozzle serving as an Patented Sept. 17, 1968 "ice electrostatic high voltage electrode, with which satisfactory and complete charging of the sprayed material is effected.
  • this object is achieved by the fact that the spraying nozzle consists of a plurality of individual nozzles, which open substantially perpendicularly of the air stream issuing from the annular gap.
  • the nozzle for the sprayed material preferably consists of a tube which tapers towards the spraying end and is covered at said end, six separate nozzles being provided in symmetrical arrangement in the conical part of the pipe wall.
  • the annular nozzle is supplied tangentially with compressed air.
  • the advantage is obtained that an intensive charging of the spraying material issuing from the separate nozzles is achieved.
  • the reason for this consists in that the material being sprayed remains substantially longer than hitherto in the discharge region of the nozzle electrode on account of the particular arrangement of the separate nozzles, this effect being further intensified by eddy formations of the compressed air on the nozzle body.
  • FIGURE 1 is a longitudinal section of a conventional spraying head
  • FIGURE 2 is a longitudinal section of a spraying head according to the invention.
  • a conventional spraying head comprises a supply pipe 10 for the material to be sprayed, said pipe terminating at its Spraying end in a central nozzle opening 11.
  • the spraying nozzle 11 is dc fined by the marginal edge of an air chamber housing 13.
  • the complete spraying head is mounted on the barrel end of a spray pistol (not shown), the pipe 10 being connected in the usual manner to the supply for the material to be sprayed and the openings 15 are connected to the supply for compressed air.
  • the pipe 10 advantageously consists of metal and is in addition connected conductively to a high voltage source.
  • the compressed air issuing from the annual gap 12 withdraws the material to be sprayed from the nozzle 11 by virtue of an ejector action and conveys it to the workpiece.
  • the material being sprayed is charged at the rim edge of the nozzle 11 connected to the high voltage source.
  • only a partial charging of the material being sprayed is achieved, firstly because only the peripheral region of the discharging jet of spraying material comes in direct contact with the electrode nozzle and secondly because the material being sprayed only remains a very short time within the corona region of the electrode nozzle, and instead flows away immediately in the direction of the work-piece.
  • a vacuum can be produced centrally within the round stream consisting of a mixture of spraying material and air (region a in the drawing), whereby the further discharge of paint or colouring agent is prevented.
  • FIGURE 2 The arrangement according to the invention is Shown in FIGURE 2.
  • individual nozzles 17 are arranged laterally in the conical end portion of the supply pipe 10' for the material to be sprayed, and in fact advantageously six nozzles are provided, while the actual end of the pipe is closed.
  • the air issuing from the annular gap 12 carries with it the spraying material from the nozzles 17 along the sloping surface of the nozzle pipe 10, so that there is obtained a satisfactory charging of the spraying material, which remains for a relatively long time in the region of the discharge zone.
  • the compressed air flowing along the nozzle body has a tendency to form eddys, and this likewise contributes to improving the charging.
  • a mist of spraying material which perhaps flows back n the centre of the round jet is obviously unable to influence the discharge of fresh material, but rather also improves the ionisation of the material being sprayed.
  • An essential feature of the invention now consists in that the holes 15 leading to the air chamber 16, by contrast with the prior art, do not extend parallel to the axis of the nozzle pipe 10, but with a slight inclination relatively thereto (at an inclination to the plane of the drawing in FIGURE 2).
  • the setting of the holes or passages 15 is such that there is rotation of the compressed air concentrically of the nozzle pipe 10 in the chamber 16, so that the air is moved with a helical motion forwardly towards the annular gap 12 and emerges from the latter as a rotating round stream or :jet, whereby there is obtained a substantial increase in the spraying action, namely, a better ionisation of the sprayed material and avoidance of a return flow of said material.
  • the supply of air to the chamber 16 can also take place from the side and approximately tangentially of the annular gap 12, and in this case a rotating air jet also issues from the annular gap 12.
  • the arrangement according to the invention shows an extraordinary depth effect of the sprayed jet.
  • Even places which are of diificult access and even narrow cavities can be satisfactorily sprayed.
  • the arrangement according to the invention can also be used without an electrostatic high voltage field, and excellent spraying results far superior to those obtained with the conventional compressed air pistols are then produced.
  • a spray gun operated by compressed air for the production of coatings of finely dispersed, liquid and solid substances under an electrostatic charge of the spraying material, a nozzle comprising an air chamber housing, a nozzle in the housing for the spraying material and attached to a high voltage source and comprising a pipe which narrows down conically toward a spraying end and which is covered up and has exit openings emptying essentially perpendicularly in relation to an axis of the pipe in symmetrical arrangement and in a conical part of the pipe, a compressed air nozzle in the form of an annular slot arranged upstream of said openings and concentrically surrounding the nozzle pipe at the spraying end and with an air chamber between the pipe and housing to feed the annular slot with compressed air and surrounding the nozzle pipe concentrically, a back wall in the chamher with bores therein to supply compressed air therethrough, said bores being angularly arranged relative to the axis of the nozzle pipe so that a turbulence will be set up in the chamber which is

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)
US574345A 1965-08-26 1966-08-23 Spray pistol Expired - Lifetime US3401883A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1577859A DE1577859B2 (de) 1965-08-26 1965-08-26 Spritzpistole

Publications (1)

Publication Number Publication Date
US3401883A true US3401883A (en) 1968-09-17

Family

ID=7311814

Family Applications (1)

Application Number Title Priority Date Filing Date
US574345A Expired - Lifetime US3401883A (en) 1965-08-26 1966-08-23 Spray pistol

Country Status (10)

Country Link
US (1) US3401883A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AT (1) AT271673B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE685975A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CH (1) CH448821A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE1577859B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DK (1) DK124801B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
ES (1) ES330541A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1157823A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NO (1) NO120827B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SE (1) SE322452B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4031854A (en) * 1973-11-19 1977-06-28 Usm Corporation Apparatus for coating articles with adhesive
US4098632A (en) * 1975-10-01 1978-07-04 Usm Corporation Adhesive process
US4198815A (en) * 1975-12-24 1980-04-22 General Electric Company Central injection fuel carburetor
US4348168A (en) * 1975-04-22 1982-09-07 Christian Coulon Process and apparatus for atomizing and burning liquid fuels
US4664315A (en) * 1986-01-15 1987-05-12 Parker Hannifin Corporation Electrostatic spray nozzle
US4762274A (en) * 1985-11-13 1988-08-09 Parker-Hannifin Corporation Inductor nozzle assembly for crop sprayers
US5188290A (en) * 1990-02-16 1993-02-23 J. Wagner Gmbh Electrostatic compressed air paint spray gun
US6378787B1 (en) * 1997-09-15 2002-04-30 Alstom Combined pressure atomizing nozzle
US20060162889A1 (en) * 2002-12-26 2006-07-27 Kunio Sekiya Method for providing canvas of paper-making machine with anti-staining agent through sprinkling, and sliding sprinkle device and anti-staining agent for use therein
US20090252821A1 (en) * 2005-08-02 2009-10-08 Solidscape, Inc. Method and apparatus for fabricating three dimensional models
US7735748B1 (en) * 2006-10-10 2010-06-15 Ingo Werner Scheer Spray nozzle with improved tip and method of manufacture
WO2012116697A1 (en) * 2011-02-28 2012-09-07 Gea Process Engineering A/S External mixing pressurized two-fluid nozzle and a spray drying method
RU2476252C2 (ru) * 2007-11-09 2013-02-27 Персьют Дайнэмикс Плк Устройство, системы и способы противопожарной защиты для воздействия на пожар посредством тумана
CN107376063A (zh) * 2017-07-04 2017-11-24 浙江医尔仁医疗科技有限公司 中西药靶向雾化装置
US10569187B2 (en) 2011-02-28 2020-02-25 Gea Process Engineering A/S External mixing pressurized two-fluid nozzle and a spray drying method

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693887A (en) * 1969-11-17 1972-09-26 Wilhelm Genannt Willi Brodlin Method and apparatus for gasifying liquid fuels and effecting a complete combustion thereof
US4478370A (en) * 1982-03-19 1984-10-23 Nordson Corporation Air atomizing nozzle assembly
NZ206707A (en) * 1982-12-31 1986-09-10 Vapocure Int Pty Drying paint coating by applying drying agent electrostatically
FR2578449B1 (fr) * 1985-03-06 1987-05-07 Bertin & Cie Dispositif de pulverisation lineaire
US5227017A (en) * 1988-01-29 1993-07-13 Ohkawara Kakohki Co., Ltd. Spray drying apparatus equipped with a spray nozzle unit
US5499768A (en) * 1989-05-31 1996-03-19 Ohkawara Kakohki Co., Ltd. Spray nozzle unit
GB2331031A (en) * 1997-11-05 1999-05-12 Itw Ltd An improved spray nozzle

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1427910A (en) * 1920-11-22 1922-09-05 William R Quinn Oil burner
US1432528A (en) * 1920-11-08 1922-10-17 Burdett Mfg Company Welding torch
US1526923A (en) * 1920-03-18 1925-02-17 American Gasaccumulator Co Tip for welding blowpipes
US1646703A (en) * 1925-04-15 1927-10-25 Hartford Empire Co Liquid-fuel burner
US2046592A (en) * 1931-04-10 1936-07-07 Vilbiss Co Spray head
US2090566A (en) * 1936-12-29 1937-08-17 Electrol Inc Oil burner
FR998642A (fr) * 1949-09-30 1952-01-21 Tuyère pour la pulvérisation d'air comprimé
US2966310A (en) * 1959-06-30 1960-12-27 Interplanetary Res & Dev Corp Electrostatic deposition spray means
US3111266A (en) * 1959-11-20 1963-11-19 Greiff Svenska Maskin Ab Spray painting gun for electrostatic spray painting

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1526923A (en) * 1920-03-18 1925-02-17 American Gasaccumulator Co Tip for welding blowpipes
US1432528A (en) * 1920-11-08 1922-10-17 Burdett Mfg Company Welding torch
US1427910A (en) * 1920-11-22 1922-09-05 William R Quinn Oil burner
US1646703A (en) * 1925-04-15 1927-10-25 Hartford Empire Co Liquid-fuel burner
US2046592A (en) * 1931-04-10 1936-07-07 Vilbiss Co Spray head
US2090566A (en) * 1936-12-29 1937-08-17 Electrol Inc Oil burner
FR998642A (fr) * 1949-09-30 1952-01-21 Tuyère pour la pulvérisation d'air comprimé
US2966310A (en) * 1959-06-30 1960-12-27 Interplanetary Res & Dev Corp Electrostatic deposition spray means
US3111266A (en) * 1959-11-20 1963-11-19 Greiff Svenska Maskin Ab Spray painting gun for electrostatic spray painting

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4031854A (en) * 1973-11-19 1977-06-28 Usm Corporation Apparatus for coating articles with adhesive
US4348168A (en) * 1975-04-22 1982-09-07 Christian Coulon Process and apparatus for atomizing and burning liquid fuels
US4098632A (en) * 1975-10-01 1978-07-04 Usm Corporation Adhesive process
US4198815A (en) * 1975-12-24 1980-04-22 General Electric Company Central injection fuel carburetor
US4762274A (en) * 1985-11-13 1988-08-09 Parker-Hannifin Corporation Inductor nozzle assembly for crop sprayers
US4664315A (en) * 1986-01-15 1987-05-12 Parker Hannifin Corporation Electrostatic spray nozzle
US5188290A (en) * 1990-02-16 1993-02-23 J. Wagner Gmbh Electrostatic compressed air paint spray gun
US6378787B1 (en) * 1997-09-15 2002-04-30 Alstom Combined pressure atomizing nozzle
US20060162889A1 (en) * 2002-12-26 2006-07-27 Kunio Sekiya Method for providing canvas of paper-making machine with anti-staining agent through sprinkling, and sliding sprinkle device and anti-staining agent for use therein
US20090252821A1 (en) * 2005-08-02 2009-10-08 Solidscape, Inc. Method and apparatus for fabricating three dimensional models
US7993123B2 (en) * 2005-08-02 2011-08-09 Solidscape, Inc. Method and apparatus for fabricating three dimensional models
US7735748B1 (en) * 2006-10-10 2010-06-15 Ingo Werner Scheer Spray nozzle with improved tip and method of manufacture
RU2476252C2 (ru) * 2007-11-09 2013-02-27 Персьют Дайнэмикс Плк Устройство, системы и способы противопожарной защиты для воздействия на пожар посредством тумана
WO2012116697A1 (en) * 2011-02-28 2012-09-07 Gea Process Engineering A/S External mixing pressurized two-fluid nozzle and a spray drying method
US9981200B2 (en) 2011-02-28 2018-05-29 Gea Process Engineering A/S External mixing pressurized two-fluid nozzle and a spray drying method
US10569187B2 (en) 2011-02-28 2020-02-25 Gea Process Engineering A/S External mixing pressurized two-fluid nozzle and a spray drying method
CN107376063A (zh) * 2017-07-04 2017-11-24 浙江医尔仁医疗科技有限公司 中西药靶向雾化装置
CN107376063B (zh) * 2017-07-04 2020-08-21 浙江医尔仁医疗科技有限公司 中西药靶向雾化装置

Also Published As

Publication number Publication date
ES330541A1 (es) 1967-06-16
GB1157823A (en) 1969-07-09
CH448821A (de) 1967-12-15
SE322452B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1970-04-06
BE685975A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1967-02-01
NO120827B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1970-12-07
DE1577859B2 (de) 1978-05-03
DE1577859A1 (de) 1969-08-28
AT271673B (de) 1969-06-10
DK124801B (da) 1972-11-27

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