EP0086616A1 - Nassstrahlgerät - Google Patents

Nassstrahlgerät Download PDF

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Publication number
EP0086616A1
EP0086616A1 EP83300609A EP83300609A EP0086616A1 EP 0086616 A1 EP0086616 A1 EP 0086616A1 EP 83300609 A EP83300609 A EP 83300609A EP 83300609 A EP83300609 A EP 83300609A EP 0086616 A1 EP0086616 A1 EP 0086616A1
Authority
EP
European Patent Office
Prior art keywords
pump
piston
compressed air
liquid
additive
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.)
Withdrawn
Application number
EP83300609A
Other languages
English (en)
French (fr)
Inventor
Frank Dudding
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.)
Industrial Chemical Cleaners (Hull) Ltd
Original Assignee
Industrial Chemical Cleaners (Hull) Ltd
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 Industrial Chemical Cleaners (Hull) Ltd filed Critical Industrial Chemical Cleaners (Hull) Ltd
Publication of EP0086616A1 publication Critical patent/EP0086616A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts
    • B24C11/005—Selection of abrasive materials or additives for abrasive blasts of additives, e.g. anti-corrosive or disinfecting agents in solid, liquid or gaseous form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
    • B24C7/0053—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier with control of feed parameters, e.g. feed rate of abrasive material or carrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
    • B24C7/0076—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier the blasting medium being a liquid stream

Definitions

  • the present invention relates to abrasive/air blasting apparatus.
  • Dry abrasive blasting techniques e.g. sand blasting
  • sand blasting Dry abrasive blasting techniques, e.g. sand blasting, are well known and have been used for many years for cleaning or preparing surfaces for various purposes. They are capable of treating large areas relatively quickly, but they do have the disadvantage of producing a wide dispersion of the debris from the surface and of the dust formed by the abrasive particles after impact on the surface. In some circumstances, this may make it unfeasible to use the technique.
  • It is also an object of the present invention to provide such apparatus comprising a container for a liquid additive and a pump to pump the additive from the container to the damping liquid; the pump preferably being a variable displacement pump by variation of the stroke of which the ratio of additive to damping liquid can be varied: and it is a further object of the present invention to provide the variable displacement pump in a form which permits running adjustment of the stroke thereof.
  • the invention provides apparatus com- schening a conduit through which a stream of compressed air is passed to a blast nozzle, a hopper for abrasive particles to deposit the particles into the compressed air stream in the conduit, the hopper being pressurized by a source of compressed air, a container for damping liquid and a pneumatically operated pump driven from said source of compressed air via a pneumatic motor to pump the liquid through an atomising orifice into the compressed air stream so as to distribute the liquid therein, whereby the jet of compressed air/abrasive leaving said nozzle and impinging on the surface to be treated is damped on impact and dust and debris arising from the blasting is substantially localised.
  • the liquid will be water and, in many instances, this may make it desirable to use an additive with,the liquid.
  • the water should contain a corrosion inhibitor.
  • the additive and the water be fed from separate containers so that the proportions of the liquid and additive can be adjusted and that the additive be metered into the damping liquid to be fed into the compressed air stream by a pump driven by the pneumatic motor so that again any fluctuation in the pressure of the compressed air will affect the supply of additive in the way that it does the supply of abrasive and of the liquid.
  • a presently preferred additive for use as a corrosion inhibitor is aqueous sodium nitrate.
  • the apparatus comprises a hopper 1 for holding abrasive particles.
  • the hopper receives a supply of compressed air from a compressor (not shown) via a pressure reservoir tank 3, a conduit 4, feed valve 7, air pressure control unit 9 and remote control safety valve 11.
  • the compressed air pressurises the hopper, the hopper top being closed for this purpose, and passes from the hopper via conduit 13 to a blast outlet 15 to which a blast nozzle may be connected, for instance, by means of a flexible tube.
  • the bottom of the hopper opens into conduit 13 via a feed valve 17 so that abrasive particles fall from the hopper into the compressed air stream and are entrained therein.
  • the pressure reservoir tank is also connected to a pneumatic motor 21 which drives a water pump 23; the pump drawing water from a tank 25 via a conduit 27 and feed valve 29 and delivering water from the tank to a conduit 31 through which the water passes via a control valve 33, a non-return valve (not shown) and a nozzle (further described hereinbelow)into the conduit 13 by means of a "Y" joint formed between the conduits 31 and 13.
  • a relief valve 35 is provided connected by conduit 37 to the water tank so that water is fed back to the tank in the event that an excess pressure arises in conduit 31 upstream of the conduit control valve 33.
  • the pneumatic motor also drives a pump 41 drawing an additive from tank 43 via conduit 45 and control valve 47 installed therein and feeding the withdrawn additive into conduit 27 drawing water from the water tank.
  • the nozzle 51 provides a through passage 53 the cross section of which is considerably reduced in relation to the cross section of conduit 31 upstream of the nozzle so that the liquid passing through the nozzle is atomised and delivered into the conduit 13 in the form of a find spray.
  • the nozzle is supported in a nozzle holder 55, forming part of conduit 31, welded to conduit 13 at a suitable hole formed therein and providing an internal boss 57 on which seats an annular flange 59 formed on the body of the nozzle.
  • the nozzle holder Upstream of the internal boss, the nozzle holder is internally screw threaded; and the nozzle is held in place in the nozzle holder by an externally screw threaded nozzle retainer 61, also forming part of conduit 31, screwed into the nozzle holder.
  • an externally screw threaded nozzle retainer 61 also forming part of conduit 31, screwed into the nozzle holder.
  • it is formed with an integral nut 63 to receive a suitable spanner.
  • the section of conduit 31 between the nozzle retainer and the one-way valve is formed by a flexible tube to make it convenient to install and remove the nozzle retainer.
  • An advantage of the illustrated apparatus is its flexibility in use.
  • the feed rates of all the materials, that is, the compressed air, the abrasive particles, the water and, if used, the additive can be independently set to give whatever volumes are suitable for the job to be performed i.e'. by adjustment of the hopper feed valve and the control valves 29, 33 and 47.
  • the apparatus also permits the relative proporations of the materials to be maintained during operation in spite of any fluctuations in air pressure of the compressed air.
  • the additive to be used will be dependent on the particular job to be performed by the apparatus. If a metal surface is to be treated at least to the extent of exposing bare metal, the additive will be a corrosive inhibitor. Alternatively, it could be a detergent, for instance, if the treated surface needs to be freed from oil or grease, or a wood preservative if the surface to be treated is a wood surface, or a disinfectant if the surface to be treated is to be left sterile. It will be understood that it may be appropriate to use more than one additive, for instance, both a detergent and a corrosion inhibitor.
  • the pneumatic motor and water pump are in the form of reciprocating piston devices and are housed in a common casing 71
  • the motor comprises a piston 74 housed in a cylinder 76 formed by the casing and the pump comprises a piston 78 housed in a cylinder 80 also formed by the casing; the two pistons being connected by a common piston rod 82 supported in bushes 84, 86, 88 mounted internally of the casing.
  • the cylinder 76 below the bush 84 forms a valve chamber receiving compressed air through input 90 via line 73, air pressure regulator 75 and air-flow regulator 77.
  • the valve 92 in the chamber is a change-over-valve arrangement, in this instance, of a conventional trip type, which operates so that in one position, it ducts compressed air via an external line 94 to the top side of the piston and connects an internal bore 96 to an exhaust port (not visible in Fig. 3) to vent the underside of piston 74 in order to effect adownward stroke of the pump, and so that in a second position, it connects line 94 to the exhaust port to vent the top side of the piston 74 and ducts compressed air via bore 96 to the underside of the piston 74 to effect the up stroke of the pump.
  • the surface area of the top side of the piston 74 is larger than the surface area of the bottom side of the piston 78, for instance in the ratio of 4.4:1, which enables the pump readily to maintain an adequate pumping rate of the water pump despite any fluctuations in the pressure of the compressed air precipitately dropping the pressure e.g. due to a poor compressor.
  • the water pump receives water from source via a ball valve 98 and discharges through conduit 100 connected to the pump cylinder; the pump piston comprising a flexible valve member 102 to admit water past the piston to flow thereabove on the down stroke of the piston but to force the water thus admitted above the piston through the conduit 100 and to induct a further amount of water through ball valve 98 on the up stroke of the pump.
  • the exhaust of air from the exhaust port of the pneumatic motor is used to drive the pump, in this instance, indicated by the reference numeral 81, for metering the additive.
  • the additive pump draws additive from the container 43 as shown in Fig. 1 and the outlet of the pump is connected at a port (not shown in Fig. 3) to conduit 100 through which water is discharged from the water pump so that the conduit outputs a mixture of additive and water which is fed to the blast outlet in the manner described in connection with Fig. 1.
  • the pneumatic motor is intended to operate at a constant air pressure as determined by the airflow regulator; the value of the constant pressure being set by the air pressure regulator according to the work being carried out. Because of this, the pneumatic motor operates as a variable speed device the speed of which can be adjusted during operation simply by altering the value of the input pressure at the air pressure regulator i.e. as the input pressure is lowered the speed of the pump drops to lower the water pumping rate and, conversely, as the input pressure increases, the speed of the motor increases to increase the water pumping rate. Because the additive metering pump is fed from the exhaust from the pneumatic motor, its pumping rate is also determined by the pumping rate of the water pump.
  • the additive metering pump comprises a casing 91 forming a cylinder 93 housing a piston 95 reciprocation of which sets the pump in action; the pump has an inlet 97 drawing additive in from the additive container and discharging the additive at an outlet 99.
  • the casing comprises'a bore 101 disposed radially of the axis of the piston to admit exhaust air from the pneumatic motor to the cylinder 93 to drive the piston on its forward stroke, that is, to the left as shown in Fig. 4; and the piston is returned by a spring 103 mounted around a rod 95' carried by the piston.
  • the pump casing provides a chamber 105 disposed coaxially of the piston rod and housing the spring.
  • the chamber forms a shoulder at the forward end thereof against which a respective end of the spring abuts, and the piston rod carries a plug 107 therein to provide at the rearward end of the rod an annular flange 107' extending radially of the piston rod and one face of which acts as an abutment for the other end of the spring.
  • variable stroke additive pump as above-described, has proved to be an efficacious form of variable displacement pump it will be understood that the present invention is not limited to the provision of a running adjustment of the additive in this form, nor to the provision of a running adjustment of the water by means of the constant pressure pneumatic motor although, again, the motor and water pump combination as described has proved to be an efficacious one. It will also be understood that it is not being asserted that the above-mentioned modification resides in any way in the design per se of the pneumatic motor or the water pump, the design being largely conventional. However, the modification does reside, in part, in the choice of the motor and pump combination having the differential piston area, the mode of operating the pneumatic motor at a constant pressure and in feeding the additive feed pump from the exhaust of the pneumatic motor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
EP83300609A 1982-02-12 1983-02-08 Nassstrahlgerät Withdrawn EP0086616A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8204195 1982-02-12
GB8204195 1982-02-12
GB8212760 1982-05-04
GB8212760 1982-05-04

Publications (1)

Publication Number Publication Date
EP0086616A1 true EP0086616A1 (de) 1983-08-24

Family

ID=26281967

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83300609A Withdrawn EP0086616A1 (de) 1982-02-12 1983-02-08 Nassstrahlgerät

Country Status (1)

Country Link
EP (1) EP0086616A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986006670A1 (en) * 1985-05-07 1986-11-20 Goudeau James L Slurry sandblasting system
DE3617692A1 (de) * 1986-05-26 1987-12-03 Klaus Fertl Vorrichtung in sandstrahlleitungen
WO1989008007A1 (en) * 1988-03-02 1989-09-08 Cleaning Technology Limited Abrasive cleaning or cutting
WO1990014927A1 (en) * 1989-05-30 1990-12-13 Ixtal Blast Technology Corp. Particle blast cleaning and treating of surfaces
WO1994000275A1 (en) * 1992-06-22 1994-01-06 Alliant Techsystems Inc. An abrasive fluid jet cutting composition and method
EP1036633A2 (de) * 1999-03-18 2000-09-20 Shibuya Kogyo Co., Ltd Verfahren zum Reinigen/Schaben und Vorrichtung dafür

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858358A (en) * 1973-01-02 1975-01-07 American Aero Ind High pressure liquid and abrasive cleaning apparatus
JPS51113290A (en) * 1975-03-31 1976-10-06 Sumitomo Metal Ind Ltd Wet blasting machine
GB1455913A (en) * 1974-07-26 1976-11-17 Hodge Clemco Ltd Blast cleaning equipment
GB1491596A (en) * 1976-06-18 1977-11-09 Hodge Clemco Ltd Blast cleaning equipment
GB1524769A (en) * 1977-06-13 1978-09-13 Hodge Clemco Ltd Blast cleaning equipment
GB2077158A (en) * 1980-06-07 1981-12-16 Wood Group Structural Coatings Wet grit blasting
GB2097304A (en) * 1981-04-07 1982-11-03 Fraser George Malcolm Abrasive cleaning

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858358A (en) * 1973-01-02 1975-01-07 American Aero Ind High pressure liquid and abrasive cleaning apparatus
GB1455913A (en) * 1974-07-26 1976-11-17 Hodge Clemco Ltd Blast cleaning equipment
JPS51113290A (en) * 1975-03-31 1976-10-06 Sumitomo Metal Ind Ltd Wet blasting machine
GB1491596A (en) * 1976-06-18 1977-11-09 Hodge Clemco Ltd Blast cleaning equipment
GB1524769A (en) * 1977-06-13 1978-09-13 Hodge Clemco Ltd Blast cleaning equipment
GB2077158A (en) * 1980-06-07 1981-12-16 Wood Group Structural Coatings Wet grit blasting
GB2097304A (en) * 1981-04-07 1982-11-03 Fraser George Malcolm Abrasive cleaning

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan vol. 1, no. 2, 4 March 1977, page 169M76 & JP-A-51-113290 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986006670A1 (en) * 1985-05-07 1986-11-20 Goudeau James L Slurry sandblasting system
US4689923A (en) * 1985-05-07 1987-09-01 Goudeaux James L Slurry sandblasting system
DE3617692A1 (de) * 1986-05-26 1987-12-03 Klaus Fertl Vorrichtung in sandstrahlleitungen
WO1989008007A1 (en) * 1988-03-02 1989-09-08 Cleaning Technology Limited Abrasive cleaning or cutting
EP0335503A2 (de) * 1988-03-02 1989-10-04 Cleaning Technology Limited Reinigen oder Schneiden mittels eines Abrasivsstrahles
EP0335503A3 (de) * 1988-03-02 1990-01-31 Cleaning Technology Limited Reinigen oder Schneiden mittels eines Abrasivsstrahles
WO1990014927A1 (en) * 1989-05-30 1990-12-13 Ixtal Blast Technology Corp. Particle blast cleaning and treating of surfaces
WO1994000275A1 (en) * 1992-06-22 1994-01-06 Alliant Techsystems Inc. An abrasive fluid jet cutting composition and method
US5363603A (en) * 1992-06-22 1994-11-15 Alliant Techsystems, Inc. Abrasive fluid jet cutting compositon and method
EP1036633A2 (de) * 1999-03-18 2000-09-20 Shibuya Kogyo Co., Ltd Verfahren zum Reinigen/Schaben und Vorrichtung dafür
EP1036633A3 (de) * 1999-03-18 2002-11-13 Shibuya Kogyo Co., Ltd Verfahren zum Reinigen/Schaben und Vorrichtung dafür
EP1422026A2 (de) * 1999-03-18 2004-05-26 Shibuya Kogyo Co., Ltd Verfahren zum Reinigen/Schaben und Vorrichtung dafür
EP1422026A3 (de) * 1999-03-18 2004-06-02 Shibuya Kogyo Co., Ltd Verfahren zum Reinigen/Schaben und Vorrichtung dafür

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19840217

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19850416

RIN1 Information on inventor provided before grant (corrected)

Inventor name: DUDDING, FRANK