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EP0580711B1 - Blast gun for compressed air - Google Patents

Blast gun for compressed air Download PDF

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Publication number
EP0580711B1
EP0580711B1 EP92909449A EP92909449A EP0580711B1 EP 0580711 B1 EP0580711 B1 EP 0580711B1 EP 92909449 A EP92909449 A EP 92909449A EP 92909449 A EP92909449 A EP 92909449A EP 0580711 B1 EP0580711 B1 EP 0580711B1
Authority
EP
European Patent Office
Prior art keywords
valve
air
dusting
compressed air
gun
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
EP92909449A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0580711A1 (en
Inventor
Ejnar Pedersen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Uni-Cleaner Europa Aps
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0580711A1 publication Critical patent/EP0580711A1/en
Application granted granted Critical
Publication of EP0580711B1 publication Critical patent/EP0580711B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/08—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape of pulsating nature, e.g. delivering liquid in successive separate quantities ; Fluidic oscillators
    • B05B1/083—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape of pulsating nature, e.g. delivering liquid in successive separate quantities ; Fluidic oscillators the pulsating mechanism comprising movable parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/005—Nozzles or other outlets specially adapted for discharging one or more gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/32—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages in which a valve member forms part of the outlet opening
    • B05B1/323—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages in which a valve member forms part of the outlet opening the valve member being actuated by the pressure of the fluid to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities

Definitions

  • the present invention relates to a dusting gun for compressed air, more specifically to a gun of the type relating to claim 1.
  • the shut-off valve is manually operated via a pawl or similar trigger mechanism mounted in connection with the handle of the dusting gun.
  • a concentrated air jet is let out through the nozzle, and by pointing this air jet on to the object to be cleaned it is possible to loosen or blast off dirt and impurities, such as dust, earth, oily coats, etc.
  • the ability of the air jet to loosen old dirt and sticking coats of various kinds depends on the dynamic pressure exerted by the jet, i.e. primarily the jet velocity. The greater the velocity the better the cleaning effect.
  • the jet velocity is limited to the available air pressure, usually 6 bar, and consequently an increase in the cleaning effect can only be achieved by increasing the air flow.
  • the air consumption easily be disproportionately large, and the cleaning method therefore uneconomical.
  • the system is also supplied with compressed air.
  • the compressed air which enters the pipe system 6 via the check valves 9 and 11 and the T-piece 4 after the liquid has been pumped in via the valves 1 and 2, serves partly to accelerate the liquid flow in the pipes (flushing action), and partly to mix the cleaning liquid with air so that air bubbles will form in the liquid flow (page 3, paragraph 2). That is, a cleaning by means of foam is aimed at.
  • the compressed air is gusty or pulsating, which is of course necessary to achieve the desired mixing of air in liquid. If the air was supplied continuously the liquid would probably be blown out of the system in one blow, which would not help the cleaning process.
  • the check valves 9 and 11 are inserted in the system in order to prevent the cleaning liquid from passing from the pipe system into the compressed-air main passage (at 8), as the cleaning liquid is pumped into the pipe system at a higher pressure than the air pressure.
  • a liquid pulsator preferably for a shower head. It comprises a piston 30, which can close a discharge opening 26, and which is connected to another piston 32, which has a larger surface area than the piston 30.
  • the piston 30 is activated by a compression spring 38, which forced the piston 30 towards the closed position.
  • the piston 30 has a very short stroke.
  • Figs. 5 and 6 and 9 and 10 show other embodiments in which the pistons corresponding to the pistons 30 and 32 are not rigidly connected to each other, but con move in relation to each other.
  • This known type of pulsator can only be used for liquids. Water in a shower passage normally has a water head which can be for example 10 m water column, corresponding to 1 bar, and a specific weight of 1.
  • the basis of the present invention is the desire to improve the loosening and cleaning effect of the dusting gun in relation to particularly firmly sticking impurities and at the same time achieve economy in the consumption of compressed air. According to the invention this is achieved by designing the dusting gun as described in the characterizing part of claim 1.
  • the oscillating shut-off valve in the dusting gun has the effect that the compressed air - instead of being ejected as a continuous air jet through the nozzle - is here split up into a series of short pressure gusts, more specifically as a pulsating air stream with periodically repeated pressure discharges.
  • These periodical discharges - by way of example with frequencies of 10-20 Hz - involve a time-related concentration of the pressure energy of the air so that the peak value of the dynamic pressure of the air in the individual discharge is increased as compared with the dynamic pressure that would be achieved, if the same volume of air was ejected continuously through the nozzle.
  • the dynamic pressure in the air jet determines the ability of the air to loosen sticking impurities and coats.
  • the pulsating air jet also has the surprising effect of almost setting the impurities in vibrating motion under the influence of the air pulses.
  • this effect to a high degree contributes to increasing the cleaning effect of the dusting gun, as the vibrations cooperate in loosening the substances so that the cleaning operation is much faster, more thorough and more economical with the consumption of compressed air.
  • the dusting gun according to the invention is therefore supposed to a certain extent to be able to replace traditional high-pressure cleaning (water-based jet cleaning) with the advantages this entails, both with regard to economy and environmental protection.
  • the mode of operation of the oscillating shut-off valve is as follows: In the normal starting position the valve body is held against the valve seat in its closing/sealing position by the coil spring. When compressed air is admitted (by activation of the trigger mechanism of the gun) the pressure is increased on one side of the piston. The pressure exceeds the spring power and the valve opens, which results in a momentary discharge of compressed air and a fall in the pressure. The valve therefore closes again and the cycle is repeated. Oscillation continues as long as compressed air is admitted to the valve, i.e. as long as the trigger mechanism is kept activated. The valve thus gives an automatic alternating opening and closing - under the influence of the static and dynamic pressures of the compressed air - of the passage of air in the dusting gun.
  • the piston seal can with advantage be embodied as described in claims 2 and 3.
  • the sealing arrangement satisfies the demand for low friction and ease of valve movement.
  • An expedient measure would be to supply the valve seat or the valve body itself with a rubber-elastic coating as described in claim 4 with a view to noise level and long life of the valve.
  • the dusting gun according to the invention can, as stated in claim 5, like any ordinary compressed air dusting gun, be combined with an ejector for the supply of liquid or grainy material together with the air.
  • the combination of pulsating compressed air and an additive consisting of an agent for cleaning or for solution gives a powerful increase in the cleaning effect. This procedure is used in special cases where such increase in efficiency is demanded.
  • the dusting gun consists essentially of a handle section 1 (pistol grip) with a trigger lever 2 and trigger guard 3, an extension barrel 4, and an exchangeable nozzle pipe 5.
  • the nozzle pipe has an exchangeable nozzle bit 6.
  • the handle section 1 contains a not shown shut-off valve, which opens by means of a trigger lever 2, and an oscillatory pressure discharge valve.
  • the pressure discharge valve is built into the portion of the handle section marked 1a.
  • the air connection to the dusting gun takes place via a hose coupling 7.
  • the nozzle pipe 5 is mounted on the handle section 1 by means of a knurled pipe union nut 8.
  • Fig. 3 is a separate sectional view of the oscillatory pressure discharge valve.
  • the main component of the pressure discharge valve is a seat valve, whose seat is designated 9, and the valve body 10.
  • the valve body is embodied in the shape of an oblong, rotationally symmetric body with a longitudinal bore.
  • One end of the valve body forms a cone-shaped tightening disk or valve body 11 with a tight fit against the seat 9.
  • a rubber coating 11a is vulcanized on to the cone-shaped part 11.
  • the opposite end of the valve body 10 constitutes a piston 12 embedded in a cylinder 13. Between the piston 12 and the cone-shaped part 11 the valve body consists of an oblong cylindrical shaft portion 14.
  • the longitudinal bore in the valve body - in the drawing designated 15 - serves to connect the hindmost side 13a of the cylinder 13 to the air passage 16 downstream of the seat valve, i.e. to the extension barrel 4 and the nozzle pipe 5.
  • the valve body is held home in its seat by a compression spring coil 17 inserted in the cylinder 13 behind the piston 12.
  • the other side 13b of the cylinder is connected via an excentrically positioned, longitudinal bore 18 to the pressure side 19, which is located immediately upstream of the seat valve on the pressure side of the latter.
  • the direction of flow through the valve is shown with arrows 20.
  • the piston part 12 of the valve body is fitted with a low-friction tightening ring composed of a teflon disk 21 and an O-ring 22.
  • the O-ring serves as a supporting disk for the teflon ring, which through its contact against the cylinder wall ensures the tightness of the piston.
  • Valve dimension, size and weight of the valve body, spring characteristics, the flow ducts' cross-sectional area, etc. are mutually adjusted so that the desired oscillatory effect is created by itself immediately on the opening of the air flow (by activation of the trigger lever 2).
  • the oscillatory effect is explained above and will not be repeated here.
  • the pressure impacts from the pressure discharges are transmitted from the seat valve 9,11 and continues through the extension barrel 4, the nozzle pipe 5 and the nozzle head 6.
  • Fig. 4 shows a combined ejector and mixer valve for liquid.
  • the liquid is supplied via a hose 23.
  • the nozzle pipe of the dusting gun is designated 24.
  • a shut-off valve incorporated in the mixer valve (the ejector) shuts off the liquid supply under the influence of the pressure of the liquid and opens again automatically when the supply of compressed air is opened.
  • the mixer valve can alternatively serve as an ejector, i.e. with pressureless supply of liquid.
  • the liquid will then be sucked to the ejector from a not shown tank or container by normal ejector effect, when compressed air is sent through the ejector.
  • Both as a mixer valve and as an ejector the quantity of liliquid is adjustable by means of a flow valve positioned at the intake opening of the ejector nozzle.
  • the flow valve is operated via a finger union nut 23a.
  • Fig. 5 shows an ejector for use in sand blasting.
  • the sand is sucked to the nozzle by the ejector effect via a tubular lance 25.
  • the suction air By regulation of the suction air through the suction hose (the so-called false air) the flow of sand can be adjusted to actual needs. Regulation is done by means of an air flow valve (volume regulation valve) 25a built into the upper end of the sand lance.
  • Fig. 6 shows an injector/mixer valve 26, which in addition to an air admission pipe 27 has two extra openings 28 an 29 for admixture of water and liquid chemicals, respectively.
  • the design makes it possible to mix air + water + chemical in one and the same jet. This combination is useful, among other things in connection with jobs requiring disinfection or cleaning for grease.
  • the mixer valve can be used in the following combinations:
  • the invention is not limited to the above shown and explained embodiment. Other types of oscillatory pressure discharge valves are also possible.
  • the primary idea of the invention is the conversion of the static energy of the compressed air into a pulsating, concentrated air jet with high dynamic energy content in the individual pressure discharges.

Landscapes

  • Nozzles (AREA)
  • Cleaning In General (AREA)
  • Valve Device For Special Equipments (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
EP92909449A 1991-04-17 1992-04-13 Blast gun for compressed air Expired - Lifetime EP0580711B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK68791A DK170523B1 (da) 1991-04-17 1991-04-17 Blæsepistol til trykluft
DK687/91 1991-04-17
PCT/DK1992/000122 WO1992018260A1 (en) 1991-04-17 1992-04-13 Blast gun for compressed air

Publications (2)

Publication Number Publication Date
EP0580711A1 EP0580711A1 (en) 1994-02-02
EP0580711B1 true EP0580711B1 (en) 1995-11-15

Family

ID=8096393

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92909449A Expired - Lifetime EP0580711B1 (en) 1991-04-17 1992-04-13 Blast gun for compressed air

Country Status (11)

Country Link
EP (1) EP0580711B1 (da)
JP (1) JP2638302B2 (da)
AU (1) AU655974B2 (da)
BR (1) BR9205897A (da)
CA (1) CA2108543C (da)
DE (1) DE69206140T2 (da)
DK (1) DK170523B1 (da)
ES (1) ES2081107T3 (da)
HU (1) HU217286B (da)
RU (1) RU2107558C1 (da)
WO (1) WO1992018260A1 (da)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101813213A (zh) * 2010-04-30 2010-08-25 重庆华林自控仪表股份有限公司 一种自洁式放料阀
CN103263984A (zh) * 2013-04-22 2013-08-28 宁波美志工具有限公司 一种灌溉装置
CN113020117A (zh) * 2021-04-08 2021-06-25 合肥国轩高科动力能源有限公司 一种活塞式非接触除尘装置

Families Citing this family (17)

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Publication number Priority date Publication date Assignee Title
SE503140C2 (sv) * 1992-05-07 1996-04-01 Dart Engineering Ag Anordning vid mediagenomledande enhet
US5966847A (en) * 1996-03-14 1999-10-19 Concept Engineering Group, Inc. Pneumatic excavator
KR101053440B1 (ko) * 2008-11-24 2011-08-02 한전케이피에스 주식회사 세정 건
CN103624038B (zh) * 2013-12-23 2016-06-29 中国石油大学(华东) 原油管道挠性爆破射流式清管器
CN104324822B (zh) * 2014-09-25 2017-03-15 北京北机机电工业有限责任公司 一种喷射装置
JP6730070B2 (ja) * 2016-04-21 2020-07-29 ダイセン株式会社 エアーノズル装置とエアーダスタとエアーチッパー
CN107088484B (zh) * 2017-06-28 2023-07-18 迈德乐喷雾系统广州有限公司 一种小型空气雾化喷嘴
JP6569828B1 (ja) * 2017-10-24 2019-09-04 日本精工株式会社 ブロー装置、並びに部品、軸受、直動装置、操舵装置、車両及び機械装置の製造方法
JP7083674B2 (ja) * 2018-03-22 2022-06-13 株式会社マキタ 携帯型ブロワ
KR101878688B1 (ko) * 2018-05-29 2018-07-27 대한민국 금속문화재 부식화합물 제거용 장치 및 방법
AU2020277759A1 (en) * 2019-05-21 2022-01-27 Synergetics Pty Ltd Ventilation and particulate matter removal system
CN111006939B (zh) * 2019-12-10 2021-04-13 东北大学 一种满足低应力波数据测量的霍普金森杆发射机构
KR102173863B1 (ko) * 2020-07-14 2020-11-06 (주)파워엔지니어링 발전소용 비산재 퇴적물 부착 방지장치
CN111810652A (zh) * 2020-08-10 2020-10-23 宁夏墨工科技有限公司 用于高温高压反应器卸料的闪速阀结构
KR102242599B1 (ko) * 2020-12-10 2021-04-20 김갑수 비산방지 에어커튼 방식 스프레이 건 및 이를 이용한 도장 공법
CN114427320B (zh) * 2022-04-07 2022-06-14 河北润飒建筑工程有限公司 一种高速公路施工用临时防护装置
CN118120810B (zh) * 2024-05-07 2024-07-12 福州优野生态农业有限公司 高效保水的果蔬真空预冷设备

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US4077569A (en) * 1976-10-04 1978-03-07 Teledyne Industries, Inc. Fluid-flow pulsator
SU1122494A1 (ru) * 1983-05-10 1984-11-07 Калининский Ордена Трудового Красного Знамени Политехнический Институт Способ гидроабразивной обработки деталей
DE3338197A1 (de) * 1983-10-20 1985-05-02 Wolfangel & Schiemann GmbH, 7257 Ditzingen Reinigungssystem mit pulsierender druckluft
US4933017A (en) * 1987-08-28 1990-06-12 Lemaks Industries, Inc. Apparatus and method for opening drains
DE3901933A1 (de) * 1989-01-24 1990-08-02 Suttner Gmbh & Co Kg Injektoranordnung, insbesondere fuer wasser-hochdruckreinigungseinrichtungen
DK166766B1 (da) * 1990-03-20 1993-07-12 K F Ind As Baerbar hoejtryksrenser

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101813213A (zh) * 2010-04-30 2010-08-25 重庆华林自控仪表股份有限公司 一种自洁式放料阀
CN101813213B (zh) * 2010-04-30 2012-05-23 重庆华林自控仪表股份有限公司 一种自洁式放料阀
CN103263984A (zh) * 2013-04-22 2013-08-28 宁波美志工具有限公司 一种灌溉装置
CN103263984B (zh) * 2013-04-22 2015-08-26 宁波美志工具有限公司 一种灌溉装置
CN113020117A (zh) * 2021-04-08 2021-06-25 合肥国轩高科动力能源有限公司 一种活塞式非接触除尘装置

Also Published As

Publication number Publication date
CA2108543A1 (en) 1992-10-18
HUT66814A (en) 1995-01-30
CA2108543C (en) 1999-11-23
EP0580711A1 (en) 1994-02-02
DK68791D0 (da) 1991-04-17
BR9205897A (pt) 1994-07-26
WO1992018260A1 (en) 1992-10-29
HU9302926D0 (en) 1994-01-28
AU1656692A (en) 1992-11-17
DK68791A (da) 1992-10-18
RU2107558C1 (ru) 1998-03-27
ES2081107T3 (es) 1996-02-16
JPH06506868A (ja) 1994-08-04
JP2638302B2 (ja) 1997-08-06
DE69206140T2 (de) 1996-05-30
AU655974B2 (en) 1995-01-19
HU217286B (hu) 1999-12-28
DE69206140D1 (de) 1995-12-21
DK170523B1 (da) 1995-10-16

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