US3883075A - Device for generating high-speed pulsed liquid jets at high repetition rates - Google Patents

Device for generating high-speed pulsed liquid jets at high repetition rates Download PDF

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Publication number
US3883075A
US3883075A US476859A US47685974A US3883075A US 3883075 A US3883075 A US 3883075A US 476859 A US476859 A US 476859A US 47685974 A US47685974 A US 47685974A US 3883075 A US3883075 A US 3883075A
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Prior art keywords
nozzles
nozzle
nozzle block
liquid
speed
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US476859A
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English (en)
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Barry E Edney
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Institut Cerac SA
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Institut Cerac SA
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/10—Making by using boring or cutting machines
    • E21D9/1066—Making by using boring or cutting machines with fluid jets
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B26F3/004—Severing by means other than cutting; Apparatus therefor by means of a fluid jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/22—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C25/00—Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam
    • E21C25/60—Slitting by jets of water or other liquid

Definitions

  • a device for generating high-speed pulsed liquid jets [21] App1 NO ;476,859 at high repetition rates includes a rotatable nozzle block in liquid connection with a high pressure pump through at least one injector means, the nozzle blofck [3O] Apphcatm Prmmy Data having a plurality of nozzles situated generally at the June 12, 1973 Switzerland 8462/73 periphery thereof and arranged about the axis of rotation thereof. The nozzles pass through the whole width [52] US. Cl. 239/101 of the nozzle block and the axes of the nozzles are in- [51] Int.
  • the invention relates to a device for generating highspeed pulsed liquid jets and more particularly to a device generating such liquid jets at high repetition rates in cumulation jet nozzles to, for example, cut, break, deform, clean materials.
  • High-speed liquid jets to cut, break, de form or clean materials is well known and is finding increased application in a wide range of industries.
  • Highspeed liquid jets have been used routinely for a number of years for cleaning purposes, in particular in petrochemical plants.
  • machines with high-speed liquid jets for cutting wood, paper, plastic sheets and similar materials are presently on the market.
  • water jets are presently being developed to be used in the field of coal and mineral mining as well as for tunnelling applications.
  • the nozzle is free of liquid.
  • the duration of the pulse is typically on the order of a few hundred microseconds.
  • twice the jet velocity can be obtained by operating in the pulsed rather than continuous mode.
  • this maximum pres sure is generated locally, towards the exit of the nozzle, where the section is smallest and where the high pressure can most easily be contained.
  • the maximum impact pressure is now the water hammer pressure.
  • the water hammer pressure is always higher than the continuous jet impact pressure.
  • the impact pressure can be as much as ten times higher for pulsed jet operation as continuous jet operation at the same maximum pressure within the apparatus.
  • Pulsed jet devices have several serious disadvantages. Although the peak power levels of 60,000 J/pulse can be achieved, the average power levels are considerably lower, approximately in the order of 200 W (assuming 1 pulse every 5 minutes). Even when the repetition rate is increased to up to pulses per minute, the average power level is still not better than 20 kW. In order to fully realize pulsed jet operation, the repetition rate must be increased by several orders of magnitude whereby the total efficiency of the system is equally to be increased.
  • the existing pulsed jet de vices generally use heavy pistons driven by compressed air into a package of liquid which is then extruded at high velocity through a long converging nozzle. This is a so-called cumulation nozzle.
  • An alternative approach is to launch a water package instead of the piston (fluid piston concept). In either case, for optimum performance it is important that the nozzle and that part of the tube between the piston and the water package be evacuated, that is be free of liquid.
  • a high-speed pulsed liquid jet device is characterized by a nozzle block rotatable about its horizontal axis at a certain speed and being in connection with a flexible tube, the nozzle block being provided with nozzles situated at the periphery of the nozzle block which pass throughout the whole width of the nozzle block.
  • the axes of the nozzles are inclined to the axis of rotation of the nozzle block at an angle a which is related to the speed of rotation of said nozzle block and the injection speed of the liquid which is injected into the nozzles by at least one injector.
  • FIG. 1 is a schematic view of a cyclo-pulser device for generating high-speed pulsed liquid jets to be used to cut a rock face;
  • FIG. 2 is a longitudinal sectional view in a developed form of a nozzle block of the device of FIG. 1 which has injected liquid packages in several nozzles;
  • FIG. 3 is a cross-sectional view of the nozzle block, in which the liquid packages remaining in the nozzles after the pulse are removed by suction or compressed air;
  • FIG. 4 is a longitudinal sectional view of a nozzle block having one nozzle
  • FIG. 5 is a cross sectional view of the nozzle block, in which the liquid packages remaining in the nozzles after the pulse are removed by centrifugal force;
  • FIG. 6 illustrates a pressure device for expelling liquid remaining in the nozzles.
  • FIG. 1 A cyclo-pulsar device is schematically illustrated in FIG. 1. Liquid is to be supplied into this device from a main water supply whereby additives as long chain mol ecules solution are added by an additives pump 6.
  • a high pressure pump delivers a continuous stream of liquid through a flexible connection tube 4 into an injector 3 of a known type which is arranged closely at a nozzle block 1. Instead of one injector, two or more injectors can be used in order to balance the forces on the nozzle block 1.
  • the speed of the continuous stream of liquid supplied to the injector 3 may be of the order of I00 m/sec.
  • This liquid stream corresponds to a fluid piston, being cut into discrete packages of finite length, each package being injected into a different nozzle 2 of the nozzle block 1.
  • the exit 3a of the injector 3 is generally noncircular in cross-section as shown in FIG. 3.
  • the injector 3 is situated near the periphery of the nozzle block 1 so that its exit 3a lies immediately at the entrance 2a (see FIGS. 2 and 4) of a respective nozzle 2, whereby its cross-sectional exit area equals at least the crosssectional entry area of the entrance 2a of the respective nozzle 2.
  • the liquid will be thus injected in packages in each nozzle 2 while the nozzle block 1 is rotating about its horizontal axis as indicated by arrow A in FIG. I.
  • each cumulation nozzle 2 is inclined at some angle a to the axis of rotation of the nozzle block 1 as is clearly shown in FIG. 2.
  • the angle a is related to both the speed of rotation of the nozzle block 1 and the injection speed as follows:
  • R the radius of the nozzle block 1
  • w the speed of rotation of the nozzle block
  • any cumulation nozzle e.g., conical exponential or hyperbolic
  • the only difference is the addition of a constant area transition section from the entrance 2a of the nozzle 2 into the section denoted 2b in FIG. 2. This is required for the following reason.
  • the entrance 2a to the nozzle 2 is ideally non-circular in cross-section (it is preferably nearly square), whereas the section beginning with 2b up to the exit is circular in crosssection.
  • a non-circular cross-section reduces both water spillage and hence wasted power as well as water hammer on the rear face of the nozzle block, thus diminishing the cavitation effect (see also FIG. 4).
  • a non-circular cross-section for the nozzle entrances 2a will also make it possible to reduce the spacing S between the nozzle entrances 2a, thus also reducing the surface area subject to water hammer pressure.
  • a combination of differently shaped nozzles allows for varying the diameter and the speed of the individual jets during each rotation of the nozzle block in such a way as to optimize the efficiency of, for example cutting material. For example, to initiate a crack in the material being operated on in a cutting operation, a very fine highspeed jet may be required to be followed by a larger jet which would open the crack still further, forcing out pieces of the material.
  • each nozzle 2 reduces from section 2b to the exit 20 of the nozzle 2.
  • high pulsed dynamic pressure heads of the liquid packages leave the exit 20 of each nozzle 2, building a continuous stream of jets of liquid to cut, break, deform or clean materials.
  • the liquid package remaining in the nozzles 2 after the pulse will then be evacuated such as by expelling it by suction applied at the rear face of the nozzle block 1 by means of a vacuum pump 7 connected to an evacuation manifold 9 as illustrated in FIG. 1.
  • evacuation of the nozzles after a pulse can be achieved by using a high-pressure air stream applied at the front face of the nozzle block 1, as shown in FIG. 6.
  • the so evacuated liquid (such as water) is recycled through the fixed (non-rotatable) evacuation manifold 9 back into the tubes 4.
  • the remaining liquid in the nozzles which represents approximately percent of the injected quantity, is conveniently rerouted to the inlet of the high pressure pump 5.
  • This recycling is of particular importance if additives are being used.
  • the speed of rotation of nozzle block 1 will be determined by the rate at which the nozzles 2 can be evacuated between individual pulses, i.e., the emptying time must be less than the period of a rotation. Due to the transversal motion of the nozzles there is no interference of the high-speed heads of the liquid jets with the low-speed tails of the jets.
  • FIG. 5 is a cross-sectional view of a nozzle block with nozzles 2, the side walls of which lying on the periphery of the nozzle block 1 are open to form ejector ports 1 1.
  • a fixed shell 10 one portion 10a of which is closed, while the other portion 10b thereof is perforated to allow the liquid remaining in the nozzles 2 after the pulse to be radially ejected by centrifugal force through the ejector ports 11 of the nozzles 2 and the perforated portion 10b of the shell into the evacuation manifold 9.
  • the nozzle block drive motor 8 is preferably attached to the driving axle 13 of the nozzle block 1 as shown in FIG. 1. This is an advantageous construction since the axle 13 can be moved together with the nozzle block 1.
  • Drive motor 8 can be an electric or hydraulic motor, being in the latter case preferably actuated directly from the high pressure pump 5.
  • lateral forces acting during the injection of the liquid by the high pressure pump 5 on the nozzle block 1 can impart a rotational movement to the nozzle block by themselves or in combination with the motor 8.
  • the flexible connection tubes 4 enable the nozzle block 1 to be moved alongside a rock face 12 or other surface to be cut or otherwise treated by the liquid jets without necessitating moving the heavier parts such as the high-pressure pump 5.
  • An additive pump 15 is coupled to the high pressure pump 5 to supply additives from the additive supply means 6 to the liquid fed to the nozzle block 1.
  • the length of the water package is set at 80 mm for an injector 22 mm wide.
  • the nozzle shape, length and area ratio By varying the nozzle shape, length and area ratio, one can, in principle, achieve only desired jet velocity. If, however, one limits the system to a liquid jet of 1 mm diameter and an exponential nozzle of 160 mm length, the following results are obtainable:
  • the dimensions of the nozzle block 1 are dictated by the emptying time of the nozzle 2. Assuming an emptying time of 30 msec., the maximum speed of rotation is limited to about 2,000 rpm. From the equation expressing the relation of the angle a, R is calculated to be 15 cm. This means that 60 nozzles could be situated in each nozzle block 1. The pulse repetition rate F would be 2,000 pulses/sec.
  • the above described device can be used, for example, for cutting concrete, rock, paving materials, brick walls, etc.
  • very high impact pressures are not necessary so that the device can be supplied with water even from a low pressure water line, e.g., from a fire hydrant.
  • Wood, paper and other soft materials can be cut at very low jet velocities. In such cases the device can be supplied with water from a normal water line.
  • very fine, high velocity, coherent jets would be required. The device is equally suited to this type of operation.
  • the evacuation of the nozzles is simple and is carried out during the time required for the nozzle block to make one rotation
  • the nozzle block is light and compact and can be advanced and traversed easily without need to move the high-pressure pump
  • the device operates at relatively low supply pressures as compared with continuous jet devices, and therefore enables the use of flexible tubing to interconnect the various components in liquid communication, and
  • a device for generating high-speed pulsed liquid jets at a high repetition rates in cumulation jet nozzles to, for example, cut, break, deform, clean materials comprising:
  • a high pressure liquid pump (5) a high pressure liquid pump (5); at least one injector means (3) coupled to and receiving pressurized liquid from said high pressure pump (5); and
  • a rotatable nozzle block (1) in liquid connection with said high pressure pump (5) through said at least one injector means (3), said nozzle block (I) having a plurality of nozzles (2) situated generally at the periphery thereof and arranged about the axis of rotation thereof, said nozzles (2) passing through the whole width of said nozzle block (1), the axes of said nozzles (2) being inclined to the axis of rotation of said nozzle block (1) at an angle (a) which is a function of the speed of rotation of said nozzle block (1) and the injection speed of the liquid injected into the nozzles (2) by said at least one injector means (3).
  • a device wherein said angle 0! is related to the speed of rotation of said nozzle block (1) and the injection speed of the liquid injected into the nozzles (2) as follows:
  • R is the radius of the nozzle block (1)
  • w is the speed of rotation of the nozzle block (1)
  • U is the injection speed of the liquid.
  • a device according to claim 1 wherein said injector means (3) is located adjacent said nozzle block (1 and including flexible connection tubes coupling said high pressure pump (5) to said injector means (3).
  • each nozzle (2) has an entrance (2a) of non-circular cross-section, the internal cavity of each nozzle reducing in size towards the exit (20) of the nozzle (2).
  • a device wherein said entrance (2a) of each of said nozzles is generally rectangular.
  • a device according to claim 1 wherein said at least one injector means (3) is non-rotatable and is located immediately adjacent said nozzle block (1) such that its exit (3a) extends at least across one nozzle entrance (2a).
  • each nozzle (2) has an entrance (2a) of non-circular cross-section, the internal cavity of each nozzle reducing in size towards the exit (2c) of the nozzle (2).
  • a device further comprising a fixed evacuation manifold (9) for evacuating the liquid remaining in the nozzles (2) after a pulse; and means for expelling the liquid from the nozzles (2) into the manifold (9) after a pulse.
  • said expelling means includes means (7) for applying suction at the rear face of said nozzle block (1) through said manifold.
  • a device according to claim 10 wherein said expelling means includes means for applying pressure air at the front face of said nozzle block (1).
  • a device wherein said nozzles (2) have peripheral ejector ports (11), and wherein said expelling means includes a closed fixed shell portion (10a) and a perforated fixed shell portion (10b) surrounding at least part of the periphery of said nozzle block (1), said perforated shell portion (10b) allowing the liquid remaining in the nozzles (2) after the pulse to be radially ejected by centrifugal force through said ejector ports (11) of said nozzles (2) into said evacuation manifold (9).
  • a device according to claim 1 wherein the nozzle block (1) is dimensioned so as to allow for the emptying of the liquid remaining in the nozzles (2) after the pulse.
  • a device according to claim 1 wherein said cumulation nozzles (2) are shaped as exponential nozzles.
  • a device according to claim 1 wherein said cumulation nozzles (2) are shaped as hyperbolic nozzles.
  • a device further comprising an additive pump (15) coupled to said high pressure pump (5) for supplying additives to the pressure liquid.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Nozzles (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Cleaning By Liquid Or Steam (AREA)
US476859A 1973-06-12 1974-06-06 Device for generating high-speed pulsed liquid jets at high repetition rates Expired - Lifetime US3883075A (en)

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CH846273A CH570855A5 (de) 1973-06-12 1973-06-12

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US (1) US3883075A (de)
JP (1) JPS5521160B2 (de)
CA (1) CA998715A (de)
CH (1) CH570855A5 (de)
DE (1) DE2335893C3 (de)
SE (1) SE416987B (de)
ZA (1) ZA743061B (de)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4111490A (en) * 1975-09-05 1978-09-05 Liesveld Daniel J Method and apparatus for channel cutting of hard materials using high velocity fluid jets
US4422882A (en) * 1981-12-29 1983-12-27 The Babcock & Wilcox Company Pulsed liquid jet-type cleaning of highly heated surfaces
DE3343555A1 (de) * 1982-12-06 1984-06-07 Dravo Corp., 15222 Pittsburgh, Pa. Verfahren und vorrichtung zur beschleunigung von fluessigkeitsmengen
US4762277A (en) * 1982-12-06 1988-08-09 Briggs Technology Inc. Apparatus for accelerating slugs of liquid
US4863101A (en) * 1982-12-06 1989-09-05 Acb Technology Corporation Accelerating slugs of liquid
US5119744A (en) * 1989-11-13 1992-06-09 The Toro Company Method and apparatus for treating turf
US5207168A (en) * 1989-11-13 1993-05-04 The Toro Company Method and apparatus for treating turf
DE19528033A1 (de) * 1995-07-31 1997-02-06 Martin Dipl Ing Graser Vorrichtung zur Erzeugung von schnellen gepulsten Hochdruckflüssigkeitsstrahlen
US5605105A (en) * 1994-10-17 1997-02-25 Great Plains Manufacturing, Incorporated Method and apparatus for placing dry or liquid materials into the soil subsurface without tillage tools
AU708012B2 (en) * 1996-03-19 1999-07-29 John Bean Technologies Corporation High speed water jet blocker
US6149733A (en) * 1996-02-02 2000-11-21 Voest-Alpine Industrianlagenbau Gmbh Apparatus and method for descaling a workpiece with a liquid jet
US6431096B1 (en) 1999-10-04 2002-08-13 Textron Inc. Method and system for high pressure liquid injection of turf seed
US6471143B2 (en) * 2000-05-01 2002-10-29 Advance Denki Kougyou Kabushiki Kaisha Injector
US6684959B1 (en) * 2002-08-02 2004-02-03 Pierce Manufacturing Inc. Foam concentrate proportioning system and methods for rescue and fire fighting vehicles
US20060243324A1 (en) * 2005-04-29 2006-11-02 Pierce Manufacturing Inc. Automatic start additive injection system for fire-fighting vehicles
US20070277358A1 (en) * 2004-02-27 2007-12-06 Jurgen Gaydoul Hydraulic Device Which Is Used To Descale Warm Rolling Products
US20100237165A1 (en) * 2009-03-23 2010-09-23 Southern Methodist University Generation of a pulsed jet by jet vectoring through a nozzle with multiple outlets
CN101555794B (zh) * 2009-05-15 2010-12-29 郝勇 煤矿大倾角上山巷道掘进时的防飞矸方法
CN102430534A (zh) * 2011-10-28 2012-05-02 中国农业科学院农田灌溉研究所 脉冲蓄能式高压水射流清洗系统
US20120223166A1 (en) * 2009-05-27 2012-09-06 Cheng Pin-Tsung Method of Producing Rubber Particles from Vulcanized Rubber Products
CN110566219A (zh) * 2019-10-19 2019-12-13 长兴国晨工程机械科技有限公司 一种用于泥水平衡顶管机的高压喷水辅助装置

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DE3122408A1 (de) * 1981-06-05 1982-12-23 Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar Verfahren und vorrichtung zur reinigung und benetzung der frontflaeche eines ultraschall-objektives
DE8812568U1 (de) * 1988-10-06 1989-01-05 Kraenzle, Josef, 7918 Illertissen, De
DE4038662A1 (de) * 1990-12-04 1992-06-11 Allguth Mineraloel Gmbh Verfahren und vorrichtung zum reinigen von gegenstaenden, insbesondere kraftfahrzeugen
DE10310620A1 (de) * 2003-03-10 2004-09-30 Nordenia Deutschland Pacimex Gmbh Entetikettierverfahren
DE102016225373A1 (de) * 2016-12-19 2018-06-21 Robert Bosch Gmbh Vorrichtung zur Erzeugung eines Fluidstrahls

Citations (3)

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Publication number Priority date Publication date Assignee Title
US3468481A (en) * 1968-05-10 1969-09-23 Exotech Hypervelocity jet producing system employing an impact cumulation process
US3478966A (en) * 1968-07-25 1969-11-18 Exotech Hypervelocity jet producing system employing an impact cumulation process
US3653596A (en) * 1970-01-13 1972-04-04 Carco Inc Marking device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3468481A (en) * 1968-05-10 1969-09-23 Exotech Hypervelocity jet producing system employing an impact cumulation process
US3478966A (en) * 1968-07-25 1969-11-18 Exotech Hypervelocity jet producing system employing an impact cumulation process
US3653596A (en) * 1970-01-13 1972-04-04 Carco Inc Marking device

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4111490A (en) * 1975-09-05 1978-09-05 Liesveld Daniel J Method and apparatus for channel cutting of hard materials using high velocity fluid jets
US4422882A (en) * 1981-12-29 1983-12-27 The Babcock & Wilcox Company Pulsed liquid jet-type cleaning of highly heated surfaces
DE3343555A1 (de) * 1982-12-06 1984-06-07 Dravo Corp., 15222 Pittsburgh, Pa. Verfahren und vorrichtung zur beschleunigung von fluessigkeitsmengen
US4762277A (en) * 1982-12-06 1988-08-09 Briggs Technology Inc. Apparatus for accelerating slugs of liquid
US4863101A (en) * 1982-12-06 1989-09-05 Acb Technology Corporation Accelerating slugs of liquid
US5119744A (en) * 1989-11-13 1992-06-09 The Toro Company Method and apparatus for treating turf
US5207168A (en) * 1989-11-13 1993-05-04 The Toro Company Method and apparatus for treating turf
US5605105A (en) * 1994-10-17 1997-02-25 Great Plains Manufacturing, Incorporated Method and apparatus for placing dry or liquid materials into the soil subsurface without tillage tools
DE19528033A1 (de) * 1995-07-31 1997-02-06 Martin Dipl Ing Graser Vorrichtung zur Erzeugung von schnellen gepulsten Hochdruckflüssigkeitsstrahlen
US6149733A (en) * 1996-02-02 2000-11-21 Voest-Alpine Industrianlagenbau Gmbh Apparatus and method for descaling a workpiece with a liquid jet
AU708012B2 (en) * 1996-03-19 1999-07-29 John Bean Technologies Corporation High speed water jet blocker
US20040187752A1 (en) * 1999-10-04 2004-09-30 Engelke Milton C. Method and system for high pressure liquid injection of turf seed
US6431096B1 (en) 1999-10-04 2002-08-13 Textron Inc. Method and system for high pressure liquid injection of turf seed
US6892657B2 (en) 1999-10-04 2005-05-17 Textron Inc. Method and system for high pressure liquid injection of turf seed
US6722298B2 (en) 1999-10-04 2004-04-20 Textron Inc. Method and system for high pressure liquid injection of turf seed
US6471143B2 (en) * 2000-05-01 2002-10-29 Advance Denki Kougyou Kabushiki Kaisha Injector
US20040020664A1 (en) * 2002-08-02 2004-02-05 Pierce Manufacturing Inc. Foam concentrate proportioning system and methods for rescue and fire fighting vehicles
US6684959B1 (en) * 2002-08-02 2004-02-03 Pierce Manufacturing Inc. Foam concentrate proportioning system and methods for rescue and fire fighting vehicles
US20070277358A1 (en) * 2004-02-27 2007-12-06 Jurgen Gaydoul Hydraulic Device Which Is Used To Descale Warm Rolling Products
US7958609B2 (en) 2004-02-27 2011-06-14 Hermetik Hydraulik Ab Hydraulic device which is used to descale warm rolling products
US20060243324A1 (en) * 2005-04-29 2006-11-02 Pierce Manufacturing Inc. Automatic start additive injection system for fire-fighting vehicles
US20100237165A1 (en) * 2009-03-23 2010-09-23 Southern Methodist University Generation of a pulsed jet by jet vectoring through a nozzle with multiple outlets
US9108711B2 (en) 2009-03-23 2015-08-18 Southern Methodist University Generation of a pulsed jet by jet vectoring through a nozzle with multiple outlets
US10697395B2 (en) 2009-03-23 2020-06-30 Southern Methodist University Generation of a pulsed jet by jet vectoring through a nozzle with multiple outlets
CN101555794B (zh) * 2009-05-15 2010-12-29 郝勇 煤矿大倾角上山巷道掘进时的防飞矸方法
US20120223166A1 (en) * 2009-05-27 2012-09-06 Cheng Pin-Tsung Method of Producing Rubber Particles from Vulcanized Rubber Products
CN102430534A (zh) * 2011-10-28 2012-05-02 中国农业科学院农田灌溉研究所 脉冲蓄能式高压水射流清洗系统
CN110566219A (zh) * 2019-10-19 2019-12-13 长兴国晨工程机械科技有限公司 一种用于泥水平衡顶管机的高压喷水辅助装置

Also Published As

Publication number Publication date
DE2335893A1 (de) 1975-01-02
ZA743061B (en) 1975-05-28
DE2335893C3 (de) 1978-03-30
JPS5035710A (de) 1975-04-04
DE2335893B2 (de) 1977-08-04
CH570855A5 (de) 1975-12-31
SE416987B (sv) 1981-02-16
CA998715A (en) 1976-10-19
SE7407511L (de) 1974-12-13
JPS5521160B2 (de) 1980-06-07

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